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![Bean Huo](/assets/img/avatar_default.png)
commit 23e09be254
upstream.
Occasionally, user-land applications initiate longer timeout values for certain commands
through ioctl() system call. But so far we are still using a fixed timeout of 10 seconds
in mmc_poll_for_busy() on the ioctl() path, even if a custom timeout is specified in the
userspace application. This patch allows custom timeout values to override this default
timeout values on the ioctl path.
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Bean Huo <beanhuo@micron.com>
Acked-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20220423221623.1074556-3-huobean@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3118 lines
77 KiB
C
3118 lines
77 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Block driver for media (i.e., flash cards)
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*
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* Copyright 2002 Hewlett-Packard Company
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* Copyright 2005-2008 Pierre Ossman
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*
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* Use consistent with the GNU GPL is permitted,
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* provided that this copyright notice is
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* preserved in its entirety in all copies and derived works.
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*
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* HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
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* AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
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* FITNESS FOR ANY PARTICULAR PURPOSE.
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*
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* Many thanks to Alessandro Rubini and Jonathan Corbet!
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*
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* Author: Andrew Christian
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* 28 May 2002
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*/
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#include <linux/moduleparam.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/hdreg.h>
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#include <linux/kdev_t.h>
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#include <linux/kref.h>
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#include <linux/blkdev.h>
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#include <linux/cdev.h>
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#include <linux/mutex.h>
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#include <linux/scatterlist.h>
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#include <linux/string_helpers.h>
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#include <linux/delay.h>
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#include <linux/capability.h>
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#include <linux/compat.h>
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#include <linux/pm_runtime.h>
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#include <linux/idr.h>
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#include <linux/debugfs.h>
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#include <linux/mmc/ioctl.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/mmc.h>
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#include <linux/mmc/sd.h>
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#include <linux/uaccess.h>
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#include "queue.h"
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#include "block.h"
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#include "core.h"
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#include "card.h"
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#include "crypto.h"
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#include "host.h"
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#include "bus.h"
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#include "mmc_ops.h"
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#include "quirks.h"
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#include "sd_ops.h"
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MODULE_ALIAS("mmc:block");
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#ifdef MODULE_PARAM_PREFIX
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#undef MODULE_PARAM_PREFIX
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#endif
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#define MODULE_PARAM_PREFIX "mmcblk."
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/*
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* Set a 10 second timeout for polling write request busy state. Note, mmc core
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* is setting a 3 second timeout for SD cards, and SDHCI has long had a 10
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* second software timer to timeout the whole request, so 10 seconds should be
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* ample.
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*/
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#define MMC_BLK_TIMEOUT_MS (10 * 1000)
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#define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
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#define MMC_EXTRACT_VALUE_FROM_ARG(x) ((x & 0x0000FF00) >> 8)
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#define mmc_req_rel_wr(req) ((req->cmd_flags & REQ_FUA) && \
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(rq_data_dir(req) == WRITE))
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static DEFINE_MUTEX(block_mutex);
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/*
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* The defaults come from config options but can be overriden by module
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* or bootarg options.
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*/
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static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
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/*
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* We've only got one major, so number of mmcblk devices is
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* limited to (1 << 20) / number of minors per device. It is also
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* limited by the MAX_DEVICES below.
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*/
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static int max_devices;
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#define MAX_DEVICES 256
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static DEFINE_IDA(mmc_blk_ida);
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static DEFINE_IDA(mmc_rpmb_ida);
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struct mmc_blk_busy_data {
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struct mmc_card *card;
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u32 status;
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};
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/*
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* There is one mmc_blk_data per slot.
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*/
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struct mmc_blk_data {
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struct device *parent;
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struct gendisk *disk;
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struct mmc_queue queue;
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struct list_head part;
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struct list_head rpmbs;
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unsigned int flags;
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#define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */
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#define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */
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struct kref kref;
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unsigned int read_only;
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unsigned int part_type;
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unsigned int reset_done;
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#define MMC_BLK_READ BIT(0)
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#define MMC_BLK_WRITE BIT(1)
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#define MMC_BLK_DISCARD BIT(2)
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#define MMC_BLK_SECDISCARD BIT(3)
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#define MMC_BLK_CQE_RECOVERY BIT(4)
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/*
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* Only set in main mmc_blk_data associated
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* with mmc_card with dev_set_drvdata, and keeps
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* track of the current selected device partition.
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*/
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unsigned int part_curr;
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int area_type;
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/* debugfs files (only in main mmc_blk_data) */
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struct dentry *status_dentry;
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struct dentry *ext_csd_dentry;
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};
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/* Device type for RPMB character devices */
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static dev_t mmc_rpmb_devt;
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/* Bus type for RPMB character devices */
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static struct bus_type mmc_rpmb_bus_type = {
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.name = "mmc_rpmb",
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};
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/**
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* struct mmc_rpmb_data - special RPMB device type for these areas
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* @dev: the device for the RPMB area
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* @chrdev: character device for the RPMB area
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* @id: unique device ID number
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* @part_index: partition index (0 on first)
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* @md: parent MMC block device
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* @node: list item, so we can put this device on a list
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*/
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struct mmc_rpmb_data {
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struct device dev;
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struct cdev chrdev;
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int id;
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unsigned int part_index;
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struct mmc_blk_data *md;
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struct list_head node;
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};
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static DEFINE_MUTEX(open_lock);
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module_param(perdev_minors, int, 0444);
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MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
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static inline int mmc_blk_part_switch(struct mmc_card *card,
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unsigned int part_type);
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static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
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struct mmc_card *card,
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int disable_multi,
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struct mmc_queue *mq);
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static void mmc_blk_hsq_req_done(struct mmc_request *mrq);
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static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
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{
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struct mmc_blk_data *md;
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mutex_lock(&open_lock);
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md = disk->private_data;
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if (md && !kref_get_unless_zero(&md->kref))
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md = NULL;
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mutex_unlock(&open_lock);
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return md;
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}
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static inline int mmc_get_devidx(struct gendisk *disk)
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{
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int devidx = disk->first_minor / perdev_minors;
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return devidx;
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}
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static void mmc_blk_kref_release(struct kref *ref)
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{
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struct mmc_blk_data *md = container_of(ref, struct mmc_blk_data, kref);
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int devidx;
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devidx = mmc_get_devidx(md->disk);
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ida_simple_remove(&mmc_blk_ida, devidx);
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mutex_lock(&open_lock);
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md->disk->private_data = NULL;
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mutex_unlock(&open_lock);
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put_disk(md->disk);
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kfree(md);
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}
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static void mmc_blk_put(struct mmc_blk_data *md)
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{
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kref_put(&md->kref, mmc_blk_kref_release);
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}
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static ssize_t power_ro_lock_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret;
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struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
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struct mmc_card *card = md->queue.card;
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int locked = 0;
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if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
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locked = 2;
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else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
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locked = 1;
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ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
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mmc_blk_put(md);
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return ret;
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}
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static ssize_t power_ro_lock_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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int ret;
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struct mmc_blk_data *md, *part_md;
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struct mmc_queue *mq;
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struct request *req;
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unsigned long set;
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if (kstrtoul(buf, 0, &set))
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return -EINVAL;
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if (set != 1)
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return count;
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md = mmc_blk_get(dev_to_disk(dev));
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mq = &md->queue;
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/* Dispatch locking to the block layer */
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req = blk_mq_alloc_request(mq->queue, REQ_OP_DRV_OUT, 0);
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if (IS_ERR(req)) {
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count = PTR_ERR(req);
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goto out_put;
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}
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req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_BOOT_WP;
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blk_execute_rq(req, false);
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ret = req_to_mmc_queue_req(req)->drv_op_result;
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blk_mq_free_request(req);
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if (!ret) {
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pr_info("%s: Locking boot partition ro until next power on\n",
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md->disk->disk_name);
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set_disk_ro(md->disk, 1);
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list_for_each_entry(part_md, &md->part, part)
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if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
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pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
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set_disk_ro(part_md->disk, 1);
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}
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}
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out_put:
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mmc_blk_put(md);
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return count;
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}
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static DEVICE_ATTR(ro_lock_until_next_power_on, 0,
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power_ro_lock_show, power_ro_lock_store);
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static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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int ret;
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struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
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ret = snprintf(buf, PAGE_SIZE, "%d\n",
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get_disk_ro(dev_to_disk(dev)) ^
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md->read_only);
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mmc_blk_put(md);
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return ret;
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}
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static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int ret;
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char *end;
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struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
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unsigned long set = simple_strtoul(buf, &end, 0);
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if (end == buf) {
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ret = -EINVAL;
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goto out;
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}
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set_disk_ro(dev_to_disk(dev), set || md->read_only);
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ret = count;
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out:
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mmc_blk_put(md);
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return ret;
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}
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static DEVICE_ATTR(force_ro, 0644, force_ro_show, force_ro_store);
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static struct attribute *mmc_disk_attrs[] = {
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&dev_attr_force_ro.attr,
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&dev_attr_ro_lock_until_next_power_on.attr,
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NULL,
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};
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static umode_t mmc_disk_attrs_is_visible(struct kobject *kobj,
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struct attribute *a, int n)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
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umode_t mode = a->mode;
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if (a == &dev_attr_ro_lock_until_next_power_on.attr &&
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(md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
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md->queue.card->ext_csd.boot_ro_lockable) {
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mode = S_IRUGO;
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if (!(md->queue.card->ext_csd.boot_ro_lock &
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EXT_CSD_BOOT_WP_B_PWR_WP_DIS))
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mode |= S_IWUSR;
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}
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mmc_blk_put(md);
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return mode;
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}
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|
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static const struct attribute_group mmc_disk_attr_group = {
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.is_visible = mmc_disk_attrs_is_visible,
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.attrs = mmc_disk_attrs,
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};
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|
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static const struct attribute_group *mmc_disk_attr_groups[] = {
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&mmc_disk_attr_group,
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NULL,
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};
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|
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static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
|
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{
|
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struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
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int ret = -ENXIO;
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|
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mutex_lock(&block_mutex);
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if (md) {
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ret = 0;
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if ((mode & FMODE_WRITE) && md->read_only) {
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mmc_blk_put(md);
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ret = -EROFS;
|
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}
|
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}
|
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mutex_unlock(&block_mutex);
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|
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return ret;
|
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}
|
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|
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static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
|
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{
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struct mmc_blk_data *md = disk->private_data;
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|
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mutex_lock(&block_mutex);
|
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mmc_blk_put(md);
|
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mutex_unlock(&block_mutex);
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}
|
|
|
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static int
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mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
|
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{
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geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
|
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geo->heads = 4;
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geo->sectors = 16;
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return 0;
|
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}
|
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|
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struct mmc_blk_ioc_data {
|
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struct mmc_ioc_cmd ic;
|
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unsigned char *buf;
|
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u64 buf_bytes;
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struct mmc_rpmb_data *rpmb;
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};
|
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|
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static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
|
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struct mmc_ioc_cmd __user *user)
|
|
{
|
|
struct mmc_blk_ioc_data *idata;
|
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int err;
|
|
|
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idata = kmalloc(sizeof(*idata), GFP_KERNEL);
|
|
if (!idata) {
|
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err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
|
|
err = -EFAULT;
|
|
goto idata_err;
|
|
}
|
|
|
|
idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
|
|
if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
|
|
err = -EOVERFLOW;
|
|
goto idata_err;
|
|
}
|
|
|
|
if (!idata->buf_bytes) {
|
|
idata->buf = NULL;
|
|
return idata;
|
|
}
|
|
|
|
idata->buf = memdup_user((void __user *)(unsigned long)
|
|
idata->ic.data_ptr, idata->buf_bytes);
|
|
if (IS_ERR(idata->buf)) {
|
|
err = PTR_ERR(idata->buf);
|
|
goto idata_err;
|
|
}
|
|
|
|
return idata;
|
|
|
|
idata_err:
|
|
kfree(idata);
|
|
out:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
|
|
struct mmc_blk_ioc_data *idata)
|
|
{
|
|
struct mmc_ioc_cmd *ic = &idata->ic;
|
|
|
|
if (copy_to_user(&(ic_ptr->response), ic->response,
|
|
sizeof(ic->response)))
|
|
return -EFAULT;
|
|
|
|
if (!idata->ic.write_flag) {
|
|
if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
|
|
idata->buf, idata->buf_bytes))
|
|
return -EFAULT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
|
|
struct mmc_blk_ioc_data *idata)
|
|
{
|
|
struct mmc_command cmd = {}, sbc = {};
|
|
struct mmc_data data = {};
|
|
struct mmc_request mrq = {};
|
|
struct scatterlist sg;
|
|
int err;
|
|
unsigned int target_part;
|
|
|
|
if (!card || !md || !idata)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* The RPMB accesses comes in from the character device, so we
|
|
* need to target these explicitly. Else we just target the
|
|
* partition type for the block device the ioctl() was issued
|
|
* on.
|
|
*/
|
|
if (idata->rpmb) {
|
|
/* Support multiple RPMB partitions */
|
|
target_part = idata->rpmb->part_index;
|
|
target_part |= EXT_CSD_PART_CONFIG_ACC_RPMB;
|
|
} else {
|
|
target_part = md->part_type;
|
|
}
|
|
|
|
cmd.opcode = idata->ic.opcode;
|
|
cmd.arg = idata->ic.arg;
|
|
cmd.flags = idata->ic.flags;
|
|
|
|
if (idata->buf_bytes) {
|
|
data.sg = &sg;
|
|
data.sg_len = 1;
|
|
data.blksz = idata->ic.blksz;
|
|
data.blocks = idata->ic.blocks;
|
|
|
|
sg_init_one(data.sg, idata->buf, idata->buf_bytes);
|
|
|
|
if (idata->ic.write_flag)
|
|
data.flags = MMC_DATA_WRITE;
|
|
else
|
|
data.flags = MMC_DATA_READ;
|
|
|
|
/* data.flags must already be set before doing this. */
|
|
mmc_set_data_timeout(&data, card);
|
|
|
|
/* Allow overriding the timeout_ns for empirical tuning. */
|
|
if (idata->ic.data_timeout_ns)
|
|
data.timeout_ns = idata->ic.data_timeout_ns;
|
|
|
|
if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
|
|
/*
|
|
* Pretend this is a data transfer and rely on the
|
|
* host driver to compute timeout. When all host
|
|
* drivers support cmd.cmd_timeout for R1B, this
|
|
* can be changed to:
|
|
*
|
|
* mrq.data = NULL;
|
|
* cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
|
|
*/
|
|
data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
|
|
}
|
|
|
|
mrq.data = &data;
|
|
}
|
|
|
|
mrq.cmd = &cmd;
|
|
|
|
err = mmc_blk_part_switch(card, target_part);
|
|
if (err)
|
|
return err;
|
|
|
|
if (idata->ic.is_acmd) {
|
|
err = mmc_app_cmd(card->host, card);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (idata->rpmb) {
|
|
sbc.opcode = MMC_SET_BLOCK_COUNT;
|
|
/*
|
|
* We don't do any blockcount validation because the max size
|
|
* may be increased by a future standard. We just copy the
|
|
* 'Reliable Write' bit here.
|
|
*/
|
|
sbc.arg = data.blocks | (idata->ic.write_flag & BIT(31));
|
|
sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
|
|
mrq.sbc = &sbc;
|
|
}
|
|
|
|
if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
|
|
(cmd.opcode == MMC_SWITCH))
|
|
return mmc_sanitize(card, idata->ic.cmd_timeout_ms);
|
|
|
|
mmc_wait_for_req(card->host, &mrq);
|
|
memcpy(&idata->ic.response, cmd.resp, sizeof(cmd.resp));
|
|
|
|
if (cmd.error) {
|
|
dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
|
|
__func__, cmd.error);
|
|
return cmd.error;
|
|
}
|
|
if (data.error) {
|
|
dev_err(mmc_dev(card->host), "%s: data error %d\n",
|
|
__func__, data.error);
|
|
return data.error;
|
|
}
|
|
|
|
/*
|
|
* Make sure the cache of the PARTITION_CONFIG register and
|
|
* PARTITION_ACCESS bits is updated in case the ioctl ext_csd write
|
|
* changed it successfully.
|
|
*/
|
|
if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_PART_CONFIG) &&
|
|
(cmd.opcode == MMC_SWITCH)) {
|
|
struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
|
|
u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg);
|
|
|
|
/*
|
|
* Update cache so the next mmc_blk_part_switch call operates
|
|
* on up-to-date data.
|
|
*/
|
|
card->ext_csd.part_config = value;
|
|
main_md->part_curr = value & EXT_CSD_PART_CONFIG_ACC_MASK;
|
|
}
|
|
|
|
/*
|
|
* Make sure to update CACHE_CTRL in case it was changed. The cache
|
|
* will get turned back on if the card is re-initialized, e.g.
|
|
* suspend/resume or hw reset in recovery.
|
|
*/
|
|
if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_CACHE_CTRL) &&
|
|
(cmd.opcode == MMC_SWITCH)) {
|
|
u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg) & 1;
|
|
|
|
card->ext_csd.cache_ctrl = value;
|
|
}
|
|
|
|
/*
|
|
* According to the SD specs, some commands require a delay after
|
|
* issuing the command.
|
|
*/
|
|
if (idata->ic.postsleep_min_us)
|
|
usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
|
|
|
|
if (idata->rpmb || (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
|
|
/*
|
|
* Ensure RPMB/R1B command has completed by polling CMD13 "Send Status". Here we
|
|
* allow to override the default timeout value if a custom timeout is specified.
|
|
*/
|
|
err = mmc_poll_for_busy(card, idata->ic.cmd_timeout_ms ? : MMC_BLK_TIMEOUT_MS,
|
|
false, MMC_BUSY_IO);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int mmc_blk_ioctl_cmd(struct mmc_blk_data *md,
|
|
struct mmc_ioc_cmd __user *ic_ptr,
|
|
struct mmc_rpmb_data *rpmb)
|
|
{
|
|
struct mmc_blk_ioc_data *idata;
|
|
struct mmc_blk_ioc_data *idatas[1];
|
|
struct mmc_queue *mq;
|
|
struct mmc_card *card;
|
|
int err = 0, ioc_err = 0;
|
|
struct request *req;
|
|
|
|
idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
|
|
if (IS_ERR(idata))
|
|
return PTR_ERR(idata);
|
|
/* This will be NULL on non-RPMB ioctl():s */
|
|
idata->rpmb = rpmb;
|
|
|
|
card = md->queue.card;
|
|
if (IS_ERR(card)) {
|
|
err = PTR_ERR(card);
|
|
goto cmd_done;
|
|
}
|
|
|
|
/*
|
|
* Dispatch the ioctl() into the block request queue.
|
|
*/
|
|
mq = &md->queue;
|
|
req = blk_mq_alloc_request(mq->queue,
|
|
idata->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto cmd_done;
|
|
}
|
|
idatas[0] = idata;
|
|
req_to_mmc_queue_req(req)->drv_op =
|
|
rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
|
|
req_to_mmc_queue_req(req)->drv_op_data = idatas;
|
|
req_to_mmc_queue_req(req)->ioc_count = 1;
|
|
blk_execute_rq(req, false);
|
|
ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
|
|
err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
|
|
blk_mq_free_request(req);
|
|
|
|
cmd_done:
|
|
kfree(idata->buf);
|
|
kfree(idata);
|
|
return ioc_err ? ioc_err : err;
|
|
}
|
|
|
|
static int mmc_blk_ioctl_multi_cmd(struct mmc_blk_data *md,
|
|
struct mmc_ioc_multi_cmd __user *user,
|
|
struct mmc_rpmb_data *rpmb)
|
|
{
|
|
struct mmc_blk_ioc_data **idata = NULL;
|
|
struct mmc_ioc_cmd __user *cmds = user->cmds;
|
|
struct mmc_card *card;
|
|
struct mmc_queue *mq;
|
|
int i, err = 0, ioc_err = 0;
|
|
__u64 num_of_cmds;
|
|
struct request *req;
|
|
|
|
if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
|
|
sizeof(num_of_cmds)))
|
|
return -EFAULT;
|
|
|
|
if (!num_of_cmds)
|
|
return 0;
|
|
|
|
if (num_of_cmds > MMC_IOC_MAX_CMDS)
|
|
return -EINVAL;
|
|
|
|
idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
|
|
if (!idata)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < num_of_cmds; i++) {
|
|
idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
|
|
if (IS_ERR(idata[i])) {
|
|
err = PTR_ERR(idata[i]);
|
|
num_of_cmds = i;
|
|
goto cmd_err;
|
|
}
|
|
/* This will be NULL on non-RPMB ioctl():s */
|
|
idata[i]->rpmb = rpmb;
|
|
}
|
|
|
|
card = md->queue.card;
|
|
if (IS_ERR(card)) {
|
|
err = PTR_ERR(card);
|
|
goto cmd_err;
|
|
}
|
|
|
|
|
|
/*
|
|
* Dispatch the ioctl()s into the block request queue.
|
|
*/
|
|
mq = &md->queue;
|
|
req = blk_mq_alloc_request(mq->queue,
|
|
idata[0]->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto cmd_err;
|
|
}
|
|
req_to_mmc_queue_req(req)->drv_op =
|
|
rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
|
|
req_to_mmc_queue_req(req)->drv_op_data = idata;
|
|
req_to_mmc_queue_req(req)->ioc_count = num_of_cmds;
|
|
blk_execute_rq(req, false);
|
|
ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
|
|
|
|
/* copy to user if data and response */
|
|
for (i = 0; i < num_of_cmds && !err; i++)
|
|
err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
|
|
|
|
blk_mq_free_request(req);
|
|
|
|
cmd_err:
|
|
for (i = 0; i < num_of_cmds; i++) {
|
|
kfree(idata[i]->buf);
|
|
kfree(idata[i]);
|
|
}
|
|
kfree(idata);
|
|
return ioc_err ? ioc_err : err;
|
|
}
|
|
|
|
static int mmc_blk_check_blkdev(struct block_device *bdev)
|
|
{
|
|
/*
|
|
* The caller must have CAP_SYS_RAWIO, and must be calling this on the
|
|
* whole block device, not on a partition. This prevents overspray
|
|
* between sibling partitions.
|
|
*/
|
|
if (!capable(CAP_SYS_RAWIO) || bdev_is_partition(bdev))
|
|
return -EPERM;
|
|
return 0;
|
|
}
|
|
|
|
static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct mmc_blk_data *md;
|
|
int ret;
|
|
|
|
switch (cmd) {
|
|
case MMC_IOC_CMD:
|
|
ret = mmc_blk_check_blkdev(bdev);
|
|
if (ret)
|
|
return ret;
|
|
md = mmc_blk_get(bdev->bd_disk);
|
|
if (!md)
|
|
return -EINVAL;
|
|
ret = mmc_blk_ioctl_cmd(md,
|
|
(struct mmc_ioc_cmd __user *)arg,
|
|
NULL);
|
|
mmc_blk_put(md);
|
|
return ret;
|
|
case MMC_IOC_MULTI_CMD:
|
|
ret = mmc_blk_check_blkdev(bdev);
|
|
if (ret)
|
|
return ret;
|
|
md = mmc_blk_get(bdev->bd_disk);
|
|
if (!md)
|
|
return -EINVAL;
|
|
ret = mmc_blk_ioctl_multi_cmd(md,
|
|
(struct mmc_ioc_multi_cmd __user *)arg,
|
|
NULL);
|
|
mmc_blk_put(md);
|
|
return ret;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
|
|
}
|
|
#endif
|
|
|
|
static int mmc_blk_alternative_gpt_sector(struct gendisk *disk,
|
|
sector_t *sector)
|
|
{
|
|
struct mmc_blk_data *md;
|
|
int ret;
|
|
|
|
md = mmc_blk_get(disk);
|
|
if (!md)
|
|
return -EINVAL;
|
|
|
|
if (md->queue.card)
|
|
ret = mmc_card_alternative_gpt_sector(md->queue.card, sector);
|
|
else
|
|
ret = -ENODEV;
|
|
|
|
mmc_blk_put(md);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct block_device_operations mmc_bdops = {
|
|
.open = mmc_blk_open,
|
|
.release = mmc_blk_release,
|
|
.getgeo = mmc_blk_getgeo,
|
|
.owner = THIS_MODULE,
|
|
.ioctl = mmc_blk_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = mmc_blk_compat_ioctl,
|
|
#endif
|
|
.alternative_gpt_sector = mmc_blk_alternative_gpt_sector,
|
|
};
|
|
|
|
static int mmc_blk_part_switch_pre(struct mmc_card *card,
|
|
unsigned int part_type)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
|
|
if (card->ext_csd.cmdq_en) {
|
|
ret = mmc_cmdq_disable(card);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
mmc_retune_pause(card->host);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mmc_blk_part_switch_post(struct mmc_card *card,
|
|
unsigned int part_type)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
|
|
mmc_retune_unpause(card->host);
|
|
if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
|
|
ret = mmc_cmdq_enable(card);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline int mmc_blk_part_switch(struct mmc_card *card,
|
|
unsigned int part_type)
|
|
{
|
|
int ret = 0;
|
|
struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
|
|
|
|
if (main_md->part_curr == part_type)
|
|
return 0;
|
|
|
|
if (mmc_card_mmc(card)) {
|
|
u8 part_config = card->ext_csd.part_config;
|
|
|
|
ret = mmc_blk_part_switch_pre(card, part_type);
|
|
if (ret)
|
|
return ret;
|
|
|
|
part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
|
|
part_config |= part_type;
|
|
|
|
ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
|
|
EXT_CSD_PART_CONFIG, part_config,
|
|
card->ext_csd.part_time);
|
|
if (ret) {
|
|
mmc_blk_part_switch_post(card, part_type);
|
|
return ret;
|
|
}
|
|
|
|
card->ext_csd.part_config = part_config;
|
|
|
|
ret = mmc_blk_part_switch_post(card, main_md->part_curr);
|
|
}
|
|
|
|
main_md->part_curr = part_type;
|
|
return ret;
|
|
}
|
|
|
|
static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks)
|
|
{
|
|
int err;
|
|
u32 result;
|
|
__be32 *blocks;
|
|
|
|
struct mmc_request mrq = {};
|
|
struct mmc_command cmd = {};
|
|
struct mmc_data data = {};
|
|
|
|
struct scatterlist sg;
|
|
|
|
cmd.opcode = MMC_APP_CMD;
|
|
cmd.arg = card->rca << 16;
|
|
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
|
|
|
|
err = mmc_wait_for_cmd(card->host, &cmd, 0);
|
|
if (err)
|
|
return err;
|
|
if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
|
|
return -EIO;
|
|
|
|
memset(&cmd, 0, sizeof(struct mmc_command));
|
|
|
|
cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
|
|
cmd.arg = 0;
|
|
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
|
|
|
|
data.blksz = 4;
|
|
data.blocks = 1;
|
|
data.flags = MMC_DATA_READ;
|
|
data.sg = &sg;
|
|
data.sg_len = 1;
|
|
mmc_set_data_timeout(&data, card);
|
|
|
|
mrq.cmd = &cmd;
|
|
mrq.data = &data;
|
|
|
|
blocks = kmalloc(4, GFP_KERNEL);
|
|
if (!blocks)
|
|
return -ENOMEM;
|
|
|
|
sg_init_one(&sg, blocks, 4);
|
|
|
|
mmc_wait_for_req(card->host, &mrq);
|
|
|
|
result = ntohl(*blocks);
|
|
kfree(blocks);
|
|
|
|
if (cmd.error || data.error)
|
|
return -EIO;
|
|
|
|
*written_blocks = result;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int mmc_blk_clock_khz(struct mmc_host *host)
|
|
{
|
|
if (host->actual_clock)
|
|
return host->actual_clock / 1000;
|
|
|
|
/* Clock may be subject to a divisor, fudge it by a factor of 2. */
|
|
if (host->ios.clock)
|
|
return host->ios.clock / 2000;
|
|
|
|
/* How can there be no clock */
|
|
WARN_ON_ONCE(1);
|
|
return 100; /* 100 kHz is minimum possible value */
|
|
}
|
|
|
|
static unsigned int mmc_blk_data_timeout_ms(struct mmc_host *host,
|
|
struct mmc_data *data)
|
|
{
|
|
unsigned int ms = DIV_ROUND_UP(data->timeout_ns, 1000000);
|
|
unsigned int khz;
|
|
|
|
if (data->timeout_clks) {
|
|
khz = mmc_blk_clock_khz(host);
|
|
ms += DIV_ROUND_UP(data->timeout_clks, khz);
|
|
}
|
|
|
|
return ms;
|
|
}
|
|
|
|
static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
|
|
int type)
|
|
{
|
|
int err;
|
|
|
|
if (md->reset_done & type)
|
|
return -EEXIST;
|
|
|
|
md->reset_done |= type;
|
|
err = mmc_hw_reset(host);
|
|
/* Ensure we switch back to the correct partition */
|
|
if (err) {
|
|
struct mmc_blk_data *main_md =
|
|
dev_get_drvdata(&host->card->dev);
|
|
int part_err;
|
|
|
|
main_md->part_curr = main_md->part_type;
|
|
part_err = mmc_blk_part_switch(host->card, md->part_type);
|
|
if (part_err) {
|
|
/*
|
|
* We have failed to get back into the correct
|
|
* partition, so we need to abort the whole request.
|
|
*/
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
|
|
{
|
|
md->reset_done &= ~type;
|
|
}
|
|
|
|
/*
|
|
* The non-block commands come back from the block layer after it queued it and
|
|
* processed it with all other requests and then they get issued in this
|
|
* function.
|
|
*/
|
|
static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req)
|
|
{
|
|
struct mmc_queue_req *mq_rq;
|
|
struct mmc_card *card = mq->card;
|
|
struct mmc_blk_data *md = mq->blkdata;
|
|
struct mmc_blk_ioc_data **idata;
|
|
bool rpmb_ioctl;
|
|
u8 **ext_csd;
|
|
u32 status;
|
|
int ret;
|
|
int i;
|
|
|
|
mq_rq = req_to_mmc_queue_req(req);
|
|
rpmb_ioctl = (mq_rq->drv_op == MMC_DRV_OP_IOCTL_RPMB);
|
|
|
|
switch (mq_rq->drv_op) {
|
|
case MMC_DRV_OP_IOCTL:
|
|
if (card->ext_csd.cmdq_en) {
|
|
ret = mmc_cmdq_disable(card);
|
|
if (ret)
|
|
break;
|
|
}
|
|
fallthrough;
|
|
case MMC_DRV_OP_IOCTL_RPMB:
|
|
idata = mq_rq->drv_op_data;
|
|
for (i = 0, ret = 0; i < mq_rq->ioc_count; i++) {
|
|
ret = __mmc_blk_ioctl_cmd(card, md, idata[i]);
|
|
if (ret)
|
|
break;
|
|
}
|
|
/* Always switch back to main area after RPMB access */
|
|
if (rpmb_ioctl)
|
|
mmc_blk_part_switch(card, 0);
|
|
else if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
|
|
mmc_cmdq_enable(card);
|
|
break;
|
|
case MMC_DRV_OP_BOOT_WP:
|
|
ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
|
|
card->ext_csd.boot_ro_lock |
|
|
EXT_CSD_BOOT_WP_B_PWR_WP_EN,
|
|
card->ext_csd.part_time);
|
|
if (ret)
|
|
pr_err("%s: Locking boot partition ro until next power on failed: %d\n",
|
|
md->disk->disk_name, ret);
|
|
else
|
|
card->ext_csd.boot_ro_lock |=
|
|
EXT_CSD_BOOT_WP_B_PWR_WP_EN;
|
|
break;
|
|
case MMC_DRV_OP_GET_CARD_STATUS:
|
|
ret = mmc_send_status(card, &status);
|
|
if (!ret)
|
|
ret = status;
|
|
break;
|
|
case MMC_DRV_OP_GET_EXT_CSD:
|
|
ext_csd = mq_rq->drv_op_data;
|
|
ret = mmc_get_ext_csd(card, ext_csd);
|
|
break;
|
|
default:
|
|
pr_err("%s: unknown driver specific operation\n",
|
|
md->disk->disk_name);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
mq_rq->drv_op_result = ret;
|
|
blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
|
|
}
|
|
|
|
static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
|
|
{
|
|
struct mmc_blk_data *md = mq->blkdata;
|
|
struct mmc_card *card = md->queue.card;
|
|
unsigned int from, nr;
|
|
int err = 0, type = MMC_BLK_DISCARD;
|
|
blk_status_t status = BLK_STS_OK;
|
|
|
|
if (!mmc_can_erase(card)) {
|
|
status = BLK_STS_NOTSUPP;
|
|
goto fail;
|
|
}
|
|
|
|
from = blk_rq_pos(req);
|
|
nr = blk_rq_sectors(req);
|
|
|
|
do {
|
|
err = 0;
|
|
if (card->quirks & MMC_QUIRK_INAND_CMD38) {
|
|
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
|
|
INAND_CMD38_ARG_EXT_CSD,
|
|
card->erase_arg == MMC_TRIM_ARG ?
|
|
INAND_CMD38_ARG_TRIM :
|
|
INAND_CMD38_ARG_ERASE,
|
|
card->ext_csd.generic_cmd6_time);
|
|
}
|
|
if (!err)
|
|
err = mmc_erase(card, from, nr, card->erase_arg);
|
|
} while (err == -EIO && !mmc_blk_reset(md, card->host, type));
|
|
if (err)
|
|
status = BLK_STS_IOERR;
|
|
else
|
|
mmc_blk_reset_success(md, type);
|
|
fail:
|
|
blk_mq_end_request(req, status);
|
|
}
|
|
|
|
static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
|
|
struct request *req)
|
|
{
|
|
struct mmc_blk_data *md = mq->blkdata;
|
|
struct mmc_card *card = md->queue.card;
|
|
unsigned int from, nr, arg;
|
|
int err = 0, type = MMC_BLK_SECDISCARD;
|
|
blk_status_t status = BLK_STS_OK;
|
|
|
|
if (!(mmc_can_secure_erase_trim(card))) {
|
|
status = BLK_STS_NOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
from = blk_rq_pos(req);
|
|
nr = blk_rq_sectors(req);
|
|
|
|
if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
|
|
arg = MMC_SECURE_TRIM1_ARG;
|
|
else
|
|
arg = MMC_SECURE_ERASE_ARG;
|
|
|
|
retry:
|
|
if (card->quirks & MMC_QUIRK_INAND_CMD38) {
|
|
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
|
|
INAND_CMD38_ARG_EXT_CSD,
|
|
arg == MMC_SECURE_TRIM1_ARG ?
|
|
INAND_CMD38_ARG_SECTRIM1 :
|
|
INAND_CMD38_ARG_SECERASE,
|
|
card->ext_csd.generic_cmd6_time);
|
|
if (err)
|
|
goto out_retry;
|
|
}
|
|
|
|
err = mmc_erase(card, from, nr, arg);
|
|
if (err == -EIO)
|
|
goto out_retry;
|
|
if (err) {
|
|
status = BLK_STS_IOERR;
|
|
goto out;
|
|
}
|
|
|
|
if (arg == MMC_SECURE_TRIM1_ARG) {
|
|
if (card->quirks & MMC_QUIRK_INAND_CMD38) {
|
|
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
|
|
INAND_CMD38_ARG_EXT_CSD,
|
|
INAND_CMD38_ARG_SECTRIM2,
|
|
card->ext_csd.generic_cmd6_time);
|
|
if (err)
|
|
goto out_retry;
|
|
}
|
|
|
|
err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
|
|
if (err == -EIO)
|
|
goto out_retry;
|
|
if (err) {
|
|
status = BLK_STS_IOERR;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out_retry:
|
|
if (err && !mmc_blk_reset(md, card->host, type))
|
|
goto retry;
|
|
if (!err)
|
|
mmc_blk_reset_success(md, type);
|
|
out:
|
|
blk_mq_end_request(req, status);
|
|
}
|
|
|
|
static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
|
|
{
|
|
struct mmc_blk_data *md = mq->blkdata;
|
|
struct mmc_card *card = md->queue.card;
|
|
int ret = 0;
|
|
|
|
ret = mmc_flush_cache(card->host);
|
|
blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
|
|
}
|
|
|
|
/*
|
|
* Reformat current write as a reliable write, supporting
|
|
* both legacy and the enhanced reliable write MMC cards.
|
|
* In each transfer we'll handle only as much as a single
|
|
* reliable write can handle, thus finish the request in
|
|
* partial completions.
|
|
*/
|
|
static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
|
|
struct mmc_card *card,
|
|
struct request *req)
|
|
{
|
|
if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
|
|
/* Legacy mode imposes restrictions on transfers. */
|
|
if (!IS_ALIGNED(blk_rq_pos(req), card->ext_csd.rel_sectors))
|
|
brq->data.blocks = 1;
|
|
|
|
if (brq->data.blocks > card->ext_csd.rel_sectors)
|
|
brq->data.blocks = card->ext_csd.rel_sectors;
|
|
else if (brq->data.blocks < card->ext_csd.rel_sectors)
|
|
brq->data.blocks = 1;
|
|
}
|
|
}
|
|
|
|
#define CMD_ERRORS_EXCL_OOR \
|
|
(R1_ADDRESS_ERROR | /* Misaligned address */ \
|
|
R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
|
|
R1_WP_VIOLATION | /* Tried to write to protected block */ \
|
|
R1_CARD_ECC_FAILED | /* Card ECC failed */ \
|
|
R1_CC_ERROR | /* Card controller error */ \
|
|
R1_ERROR) /* General/unknown error */
|
|
|
|
#define CMD_ERRORS \
|
|
(CMD_ERRORS_EXCL_OOR | \
|
|
R1_OUT_OF_RANGE) /* Command argument out of range */ \
|
|
|
|
static void mmc_blk_eval_resp_error(struct mmc_blk_request *brq)
|
|
{
|
|
u32 val;
|
|
|
|
/*
|
|
* Per the SD specification(physical layer version 4.10)[1],
|
|
* section 4.3.3, it explicitly states that "When the last
|
|
* block of user area is read using CMD18, the host should
|
|
* ignore OUT_OF_RANGE error that may occur even the sequence
|
|
* is correct". And JESD84-B51 for eMMC also has a similar
|
|
* statement on section 6.8.3.
|
|
*
|
|
* Multiple block read/write could be done by either predefined
|
|
* method, namely CMD23, or open-ending mode. For open-ending mode,
|
|
* we should ignore the OUT_OF_RANGE error as it's normal behaviour.
|
|
*
|
|
* However the spec[1] doesn't tell us whether we should also
|
|
* ignore that for predefined method. But per the spec[1], section
|
|
* 4.15 Set Block Count Command, it says"If illegal block count
|
|
* is set, out of range error will be indicated during read/write
|
|
* operation (For example, data transfer is stopped at user area
|
|
* boundary)." In another word, we could expect a out of range error
|
|
* in the response for the following CMD18/25. And if argument of
|
|
* CMD23 + the argument of CMD18/25 exceed the max number of blocks,
|
|
* we could also expect to get a -ETIMEDOUT or any error number from
|
|
* the host drivers due to missing data response(for write)/data(for
|
|
* read), as the cards will stop the data transfer by itself per the
|
|
* spec. So we only need to check R1_OUT_OF_RANGE for open-ending mode.
|
|
*/
|
|
|
|
if (!brq->stop.error) {
|
|
bool oor_with_open_end;
|
|
/* If there is no error yet, check R1 response */
|
|
|
|
val = brq->stop.resp[0] & CMD_ERRORS;
|
|
oor_with_open_end = val & R1_OUT_OF_RANGE && !brq->mrq.sbc;
|
|
|
|
if (val && !oor_with_open_end)
|
|
brq->stop.error = -EIO;
|
|
}
|
|
}
|
|
|
|
static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
|
|
int disable_multi, bool *do_rel_wr_p,
|
|
bool *do_data_tag_p)
|
|
{
|
|
struct mmc_blk_data *md = mq->blkdata;
|
|
struct mmc_card *card = md->queue.card;
|
|
struct mmc_blk_request *brq = &mqrq->brq;
|
|
struct request *req = mmc_queue_req_to_req(mqrq);
|
|
bool do_rel_wr, do_data_tag;
|
|
|
|
/*
|
|
* Reliable writes are used to implement Forced Unit Access and
|
|
* are supported only on MMCs.
|
|
*/
|
|
do_rel_wr = (req->cmd_flags & REQ_FUA) &&
|
|
rq_data_dir(req) == WRITE &&
|
|
(md->flags & MMC_BLK_REL_WR);
|
|
|
|
memset(brq, 0, sizeof(struct mmc_blk_request));
|
|
|
|
mmc_crypto_prepare_req(mqrq);
|
|
|
|
brq->mrq.data = &brq->data;
|
|
brq->mrq.tag = req->tag;
|
|
|
|
brq->stop.opcode = MMC_STOP_TRANSMISSION;
|
|
brq->stop.arg = 0;
|
|
|
|
if (rq_data_dir(req) == READ) {
|
|
brq->data.flags = MMC_DATA_READ;
|
|
brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
|
|
} else {
|
|
brq->data.flags = MMC_DATA_WRITE;
|
|
brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
|
|
}
|
|
|
|
brq->data.blksz = 512;
|
|
brq->data.blocks = blk_rq_sectors(req);
|
|
brq->data.blk_addr = blk_rq_pos(req);
|
|
|
|
/*
|
|
* The command queue supports 2 priorities: "high" (1) and "simple" (0).
|
|
* The eMMC will give "high" priority tasks priority over "simple"
|
|
* priority tasks. Here we always set "simple" priority by not setting
|
|
* MMC_DATA_PRIO.
|
|
*/
|
|
|
|
/*
|
|
* The block layer doesn't support all sector count
|
|
* restrictions, so we need to be prepared for too big
|
|
* requests.
|
|
*/
|
|
if (brq->data.blocks > card->host->max_blk_count)
|
|
brq->data.blocks = card->host->max_blk_count;
|
|
|
|
if (brq->data.blocks > 1) {
|
|
/*
|
|
* Some SD cards in SPI mode return a CRC error or even lock up
|
|
* completely when trying to read the last block using a
|
|
* multiblock read command.
|
|
*/
|
|
if (mmc_host_is_spi(card->host) && (rq_data_dir(req) == READ) &&
|
|
(blk_rq_pos(req) + blk_rq_sectors(req) ==
|
|
get_capacity(md->disk)))
|
|
brq->data.blocks--;
|
|
|
|
/*
|
|
* After a read error, we redo the request one sector
|
|
* at a time in order to accurately determine which
|
|
* sectors can be read successfully.
|
|
*/
|
|
if (disable_multi)
|
|
brq->data.blocks = 1;
|
|
|
|
/*
|
|
* Some controllers have HW issues while operating
|
|
* in multiple I/O mode
|
|
*/
|
|
if (card->host->ops->multi_io_quirk)
|
|
brq->data.blocks = card->host->ops->multi_io_quirk(card,
|
|
(rq_data_dir(req) == READ) ?
|
|
MMC_DATA_READ : MMC_DATA_WRITE,
|
|
brq->data.blocks);
|
|
}
|
|
|
|
if (do_rel_wr) {
|
|
mmc_apply_rel_rw(brq, card, req);
|
|
brq->data.flags |= MMC_DATA_REL_WR;
|
|
}
|
|
|
|
/*
|
|
* Data tag is used only during writing meta data to speed
|
|
* up write and any subsequent read of this meta data
|
|
*/
|
|
do_data_tag = card->ext_csd.data_tag_unit_size &&
|
|
(req->cmd_flags & REQ_META) &&
|
|
(rq_data_dir(req) == WRITE) &&
|
|
((brq->data.blocks * brq->data.blksz) >=
|
|
card->ext_csd.data_tag_unit_size);
|
|
|
|
if (do_data_tag)
|
|
brq->data.flags |= MMC_DATA_DAT_TAG;
|
|
|
|
mmc_set_data_timeout(&brq->data, card);
|
|
|
|
brq->data.sg = mqrq->sg;
|
|
brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
|
|
|
|
/*
|
|
* Adjust the sg list so it is the same size as the
|
|
* request.
|
|
*/
|
|
if (brq->data.blocks != blk_rq_sectors(req)) {
|
|
int i, data_size = brq->data.blocks << 9;
|
|
struct scatterlist *sg;
|
|
|
|
for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
|
|
data_size -= sg->length;
|
|
if (data_size <= 0) {
|
|
sg->length += data_size;
|
|
i++;
|
|
break;
|
|
}
|
|
}
|
|
brq->data.sg_len = i;
|
|
}
|
|
|
|
if (do_rel_wr_p)
|
|
*do_rel_wr_p = do_rel_wr;
|
|
|
|
if (do_data_tag_p)
|
|
*do_data_tag_p = do_data_tag;
|
|
}
|
|
|
|
#define MMC_CQE_RETRIES 2
|
|
|
|
static void mmc_blk_cqe_complete_rq(struct mmc_queue *mq, struct request *req)
|
|
{
|
|
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
|
|
struct mmc_request *mrq = &mqrq->brq.mrq;
|
|
struct request_queue *q = req->q;
|
|
struct mmc_host *host = mq->card->host;
|
|
enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
|
|
unsigned long flags;
|
|
bool put_card;
|
|
int err;
|
|
|
|
mmc_cqe_post_req(host, mrq);
|
|
|
|
if (mrq->cmd && mrq->cmd->error)
|
|
err = mrq->cmd->error;
|
|
else if (mrq->data && mrq->data->error)
|
|
err = mrq->data->error;
|
|
else
|
|
err = 0;
|
|
|
|
if (err) {
|
|
if (mqrq->retries++ < MMC_CQE_RETRIES)
|
|
blk_mq_requeue_request(req, true);
|
|
else
|
|
blk_mq_end_request(req, BLK_STS_IOERR);
|
|
} else if (mrq->data) {
|
|
if (blk_update_request(req, BLK_STS_OK, mrq->data->bytes_xfered))
|
|
blk_mq_requeue_request(req, true);
|
|
else
|
|
__blk_mq_end_request(req, BLK_STS_OK);
|
|
} else {
|
|
blk_mq_end_request(req, BLK_STS_OK);
|
|
}
|
|
|
|
spin_lock_irqsave(&mq->lock, flags);
|
|
|
|
mq->in_flight[issue_type] -= 1;
|
|
|
|
put_card = (mmc_tot_in_flight(mq) == 0);
|
|
|
|
mmc_cqe_check_busy(mq);
|
|
|
|
spin_unlock_irqrestore(&mq->lock, flags);
|
|
|
|
if (!mq->cqe_busy)
|
|
blk_mq_run_hw_queues(q, true);
|
|
|
|
if (put_card)
|
|
mmc_put_card(mq->card, &mq->ctx);
|
|
}
|
|
|
|
void mmc_blk_cqe_recovery(struct mmc_queue *mq)
|
|
{
|
|
struct mmc_card *card = mq->card;
|
|
struct mmc_host *host = card->host;
|
|
int err;
|
|
|
|
pr_debug("%s: CQE recovery start\n", mmc_hostname(host));
|
|
|
|
err = mmc_cqe_recovery(host);
|
|
if (err)
|
|
mmc_blk_reset(mq->blkdata, host, MMC_BLK_CQE_RECOVERY);
|
|
else
|
|
mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY);
|
|
|
|
pr_debug("%s: CQE recovery done\n", mmc_hostname(host));
|
|
}
|
|
|
|
static void mmc_blk_cqe_req_done(struct mmc_request *mrq)
|
|
{
|
|
struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
|
|
brq.mrq);
|
|
struct request *req = mmc_queue_req_to_req(mqrq);
|
|
struct request_queue *q = req->q;
|
|
struct mmc_queue *mq = q->queuedata;
|
|
|
|
/*
|
|
* Block layer timeouts race with completions which means the normal
|
|
* completion path cannot be used during recovery.
|
|
*/
|
|
if (mq->in_recovery)
|
|
mmc_blk_cqe_complete_rq(mq, req);
|
|
else if (likely(!blk_should_fake_timeout(req->q)))
|
|
blk_mq_complete_request(req);
|
|
}
|
|
|
|
static int mmc_blk_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq)
|
|
{
|
|
mrq->done = mmc_blk_cqe_req_done;
|
|
mrq->recovery_notifier = mmc_cqe_recovery_notifier;
|
|
|
|
return mmc_cqe_start_req(host, mrq);
|
|
}
|
|
|
|
static struct mmc_request *mmc_blk_cqe_prep_dcmd(struct mmc_queue_req *mqrq,
|
|
struct request *req)
|
|
{
|
|
struct mmc_blk_request *brq = &mqrq->brq;
|
|
|
|
memset(brq, 0, sizeof(*brq));
|
|
|
|
brq->mrq.cmd = &brq->cmd;
|
|
brq->mrq.tag = req->tag;
|
|
|
|
return &brq->mrq;
|
|
}
|
|
|
|
static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request *req)
|
|
{
|
|
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
|
|
struct mmc_request *mrq = mmc_blk_cqe_prep_dcmd(mqrq, req);
|
|
|
|
mrq->cmd->opcode = MMC_SWITCH;
|
|
mrq->cmd->arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
|
|
(EXT_CSD_FLUSH_CACHE << 16) |
|
|
(1 << 8) |
|
|
EXT_CSD_CMD_SET_NORMAL;
|
|
mrq->cmd->flags = MMC_CMD_AC | MMC_RSP_R1B;
|
|
|
|
return mmc_blk_cqe_start_req(mq->card->host, mrq);
|
|
}
|
|
|
|
static int mmc_blk_hsq_issue_rw_rq(struct mmc_queue *mq, struct request *req)
|
|
{
|
|
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
|
|
struct mmc_host *host = mq->card->host;
|
|
int err;
|
|
|
|
mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
|
|
mqrq->brq.mrq.done = mmc_blk_hsq_req_done;
|
|
mmc_pre_req(host, &mqrq->brq.mrq);
|
|
|
|
err = mmc_cqe_start_req(host, &mqrq->brq.mrq);
|
|
if (err)
|
|
mmc_post_req(host, &mqrq->brq.mrq, err);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int mmc_blk_cqe_issue_rw_rq(struct mmc_queue *mq, struct request *req)
|
|
{
|
|
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
|
|
struct mmc_host *host = mq->card->host;
|
|
|
|
if (host->hsq_enabled)
|
|
return mmc_blk_hsq_issue_rw_rq(mq, req);
|
|
|
|
mmc_blk_data_prep(mq, mqrq, 0, NULL, NULL);
|
|
|
|
return mmc_blk_cqe_start_req(mq->card->host, &mqrq->brq.mrq);
|
|
}
|
|
|
|
static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
|
|
struct mmc_card *card,
|
|
int disable_multi,
|
|
struct mmc_queue *mq)
|
|
{
|
|
u32 readcmd, writecmd;
|
|
struct mmc_blk_request *brq = &mqrq->brq;
|
|
struct request *req = mmc_queue_req_to_req(mqrq);
|
|
struct mmc_blk_data *md = mq->blkdata;
|
|
bool do_rel_wr, do_data_tag;
|
|
|
|
mmc_blk_data_prep(mq, mqrq, disable_multi, &do_rel_wr, &do_data_tag);
|
|
|
|
brq->mrq.cmd = &brq->cmd;
|
|
|
|
brq->cmd.arg = blk_rq_pos(req);
|
|
if (!mmc_card_blockaddr(card))
|
|
brq->cmd.arg <<= 9;
|
|
brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
|
|
|
|
if (brq->data.blocks > 1 || do_rel_wr) {
|
|
/* SPI multiblock writes terminate using a special
|
|
* token, not a STOP_TRANSMISSION request.
|
|
*/
|
|
if (!mmc_host_is_spi(card->host) ||
|
|
rq_data_dir(req) == READ)
|
|
brq->mrq.stop = &brq->stop;
|
|
readcmd = MMC_READ_MULTIPLE_BLOCK;
|
|
writecmd = MMC_WRITE_MULTIPLE_BLOCK;
|
|
} else {
|
|
brq->mrq.stop = NULL;
|
|
readcmd = MMC_READ_SINGLE_BLOCK;
|
|
writecmd = MMC_WRITE_BLOCK;
|
|
}
|
|
brq->cmd.opcode = rq_data_dir(req) == READ ? readcmd : writecmd;
|
|
|
|
/*
|
|
* Pre-defined multi-block transfers are preferable to
|
|
* open ended-ones (and necessary for reliable writes).
|
|
* However, it is not sufficient to just send CMD23,
|
|
* and avoid the final CMD12, as on an error condition
|
|
* CMD12 (stop) needs to be sent anyway. This, coupled
|
|
* with Auto-CMD23 enhancements provided by some
|
|
* hosts, means that the complexity of dealing
|
|
* with this is best left to the host. If CMD23 is
|
|
* supported by card and host, we'll fill sbc in and let
|
|
* the host deal with handling it correctly. This means
|
|
* that for hosts that don't expose MMC_CAP_CMD23, no
|
|
* change of behavior will be observed.
|
|
*
|
|
* N.B: Some MMC cards experience perf degradation.
|
|
* We'll avoid using CMD23-bounded multiblock writes for
|
|
* these, while retaining features like reliable writes.
|
|
*/
|
|
if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
|
|
(do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
|
|
do_data_tag)) {
|
|
brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
|
|
brq->sbc.arg = brq->data.blocks |
|
|
(do_rel_wr ? (1 << 31) : 0) |
|
|
(do_data_tag ? (1 << 29) : 0);
|
|
brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
|
|
brq->mrq.sbc = &brq->sbc;
|
|
}
|
|
}
|
|
|
|
#define MMC_MAX_RETRIES 5
|
|
#define MMC_DATA_RETRIES 2
|
|
#define MMC_NO_RETRIES (MMC_MAX_RETRIES + 1)
|
|
|
|
static int mmc_blk_send_stop(struct mmc_card *card, unsigned int timeout)
|
|
{
|
|
struct mmc_command cmd = {
|
|
.opcode = MMC_STOP_TRANSMISSION,
|
|
.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC,
|
|
/* Some hosts wait for busy anyway, so provide a busy timeout */
|
|
.busy_timeout = timeout,
|
|
};
|
|
|
|
return mmc_wait_for_cmd(card->host, &cmd, 5);
|
|
}
|
|
|
|
static int mmc_blk_fix_state(struct mmc_card *card, struct request *req)
|
|
{
|
|
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
|
|
struct mmc_blk_request *brq = &mqrq->brq;
|
|
unsigned int timeout = mmc_blk_data_timeout_ms(card->host, &brq->data);
|
|
int err;
|
|
|
|
mmc_retune_hold_now(card->host);
|
|
|
|
mmc_blk_send_stop(card, timeout);
|
|
|
|
err = mmc_poll_for_busy(card, timeout, false, MMC_BUSY_IO);
|
|
|
|
mmc_retune_release(card->host);
|
|
|
|
return err;
|
|
}
|
|
|
|
#define MMC_READ_SINGLE_RETRIES 2
|
|
|
|
/* Single sector read during recovery */
|
|
static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req)
|
|
{
|
|
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
|
|
struct mmc_request *mrq = &mqrq->brq.mrq;
|
|
struct mmc_card *card = mq->card;
|
|
struct mmc_host *host = card->host;
|
|
blk_status_t error = BLK_STS_OK;
|
|
|
|
do {
|
|
u32 status;
|
|
int err;
|
|
int retries = 0;
|
|
|
|
while (retries++ <= MMC_READ_SINGLE_RETRIES) {
|
|
mmc_blk_rw_rq_prep(mqrq, card, 1, mq);
|
|
|
|
mmc_wait_for_req(host, mrq);
|
|
|
|
err = mmc_send_status(card, &status);
|
|
if (err)
|
|
goto error_exit;
|
|
|
|
if (!mmc_host_is_spi(host) &&
|
|
!mmc_ready_for_data(status)) {
|
|
err = mmc_blk_fix_state(card, req);
|
|
if (err)
|
|
goto error_exit;
|
|
}
|
|
|
|
if (!mrq->cmd->error)
|
|
break;
|
|
}
|
|
|
|
if (mrq->cmd->error ||
|
|
mrq->data->error ||
|
|
(!mmc_host_is_spi(host) &&
|
|
(mrq->cmd->resp[0] & CMD_ERRORS || status & CMD_ERRORS)))
|
|
error = BLK_STS_IOERR;
|
|
else
|
|
error = BLK_STS_OK;
|
|
|
|
} while (blk_update_request(req, error, 512));
|
|
|
|
return;
|
|
|
|
error_exit:
|
|
mrq->data->bytes_xfered = 0;
|
|
blk_update_request(req, BLK_STS_IOERR, 512);
|
|
/* Let it try the remaining request again */
|
|
if (mqrq->retries > MMC_MAX_RETRIES - 1)
|
|
mqrq->retries = MMC_MAX_RETRIES - 1;
|
|
}
|
|
|
|
static inline bool mmc_blk_oor_valid(struct mmc_blk_request *brq)
|
|
{
|
|
return !!brq->mrq.sbc;
|
|
}
|
|
|
|
static inline u32 mmc_blk_stop_err_bits(struct mmc_blk_request *brq)
|
|
{
|
|
return mmc_blk_oor_valid(brq) ? CMD_ERRORS : CMD_ERRORS_EXCL_OOR;
|
|
}
|
|
|
|
/*
|
|
* Check for errors the host controller driver might not have seen such as
|
|
* response mode errors or invalid card state.
|
|
*/
|
|
static bool mmc_blk_status_error(struct request *req, u32 status)
|
|
{
|
|
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
|
|
struct mmc_blk_request *brq = &mqrq->brq;
|
|
struct mmc_queue *mq = req->q->queuedata;
|
|
u32 stop_err_bits;
|
|
|
|
if (mmc_host_is_spi(mq->card->host))
|
|
return false;
|
|
|
|
stop_err_bits = mmc_blk_stop_err_bits(brq);
|
|
|
|
return brq->cmd.resp[0] & CMD_ERRORS ||
|
|
brq->stop.resp[0] & stop_err_bits ||
|
|
status & stop_err_bits ||
|
|
(rq_data_dir(req) == WRITE && !mmc_ready_for_data(status));
|
|
}
|
|
|
|
static inline bool mmc_blk_cmd_started(struct mmc_blk_request *brq)
|
|
{
|
|
return !brq->sbc.error && !brq->cmd.error &&
|
|
!(brq->cmd.resp[0] & CMD_ERRORS);
|
|
}
|
|
|
|
/*
|
|
* Requests are completed by mmc_blk_mq_complete_rq() which sets simple
|
|
* policy:
|
|
* 1. A request that has transferred at least some data is considered
|
|
* successful and will be requeued if there is remaining data to
|
|
* transfer.
|
|
* 2. Otherwise the number of retries is incremented and the request
|
|
* will be requeued if there are remaining retries.
|
|
* 3. Otherwise the request will be errored out.
|
|
* That means mmc_blk_mq_complete_rq() is controlled by bytes_xfered and
|
|
* mqrq->retries. So there are only 4 possible actions here:
|
|
* 1. do not accept the bytes_xfered value i.e. set it to zero
|
|
* 2. change mqrq->retries to determine the number of retries
|
|
* 3. try to reset the card
|
|
* 4. read one sector at a time
|
|
*/
|
|
static void mmc_blk_mq_rw_recovery(struct mmc_queue *mq, struct request *req)
|
|
{
|
|
int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
|
|
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
|
|
struct mmc_blk_request *brq = &mqrq->brq;
|
|
struct mmc_blk_data *md = mq->blkdata;
|
|
struct mmc_card *card = mq->card;
|
|
u32 status;
|
|
u32 blocks;
|
|
int err;
|
|
|
|
/*
|
|
* Some errors the host driver might not have seen. Set the number of
|
|
* bytes transferred to zero in that case.
|
|
*/
|
|
err = __mmc_send_status(card, &status, 0);
|
|
if (err || mmc_blk_status_error(req, status))
|
|
brq->data.bytes_xfered = 0;
|
|
|
|
mmc_retune_release(card->host);
|
|
|
|
/*
|
|
* Try again to get the status. This also provides an opportunity for
|
|
* re-tuning.
|
|
*/
|
|
if (err)
|
|
err = __mmc_send_status(card, &status, 0);
|
|
|
|
/*
|
|
* Nothing more to do after the number of bytes transferred has been
|
|
* updated and there is no card.
|
|
*/
|
|
if (err && mmc_detect_card_removed(card->host))
|
|
return;
|
|
|
|
/* Try to get back to "tran" state */
|
|
if (!mmc_host_is_spi(mq->card->host) &&
|
|
(err || !mmc_ready_for_data(status)))
|
|
err = mmc_blk_fix_state(mq->card, req);
|
|
|
|
/*
|
|
* Special case for SD cards where the card might record the number of
|
|
* blocks written.
|
|
*/
|
|
if (!err && mmc_blk_cmd_started(brq) && mmc_card_sd(card) &&
|
|
rq_data_dir(req) == WRITE) {
|
|
if (mmc_sd_num_wr_blocks(card, &blocks))
|
|
brq->data.bytes_xfered = 0;
|
|
else
|
|
brq->data.bytes_xfered = blocks << 9;
|
|
}
|
|
|
|
/* Reset if the card is in a bad state */
|
|
if (!mmc_host_is_spi(mq->card->host) &&
|
|
err && mmc_blk_reset(md, card->host, type)) {
|
|
pr_err("%s: recovery failed!\n", req->q->disk->disk_name);
|
|
mqrq->retries = MMC_NO_RETRIES;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If anything was done, just return and if there is anything remaining
|
|
* on the request it will get requeued.
|
|
*/
|
|
if (brq->data.bytes_xfered)
|
|
return;
|
|
|
|
/* Reset before last retry */
|
|
if (mqrq->retries + 1 == MMC_MAX_RETRIES)
|
|
mmc_blk_reset(md, card->host, type);
|
|
|
|
/* Command errors fail fast, so use all MMC_MAX_RETRIES */
|
|
if (brq->sbc.error || brq->cmd.error)
|
|
return;
|
|
|
|
/* Reduce the remaining retries for data errors */
|
|
if (mqrq->retries < MMC_MAX_RETRIES - MMC_DATA_RETRIES) {
|
|
mqrq->retries = MMC_MAX_RETRIES - MMC_DATA_RETRIES;
|
|
return;
|
|
}
|
|
|
|
/* FIXME: Missing single sector read for large sector size */
|
|
if (!mmc_large_sector(card) && rq_data_dir(req) == READ &&
|
|
brq->data.blocks > 1) {
|
|
/* Read one sector at a time */
|
|
mmc_blk_read_single(mq, req);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static inline bool mmc_blk_rq_error(struct mmc_blk_request *brq)
|
|
{
|
|
mmc_blk_eval_resp_error(brq);
|
|
|
|
return brq->sbc.error || brq->cmd.error || brq->stop.error ||
|
|
brq->data.error || brq->cmd.resp[0] & CMD_ERRORS;
|
|
}
|
|
|
|
static int mmc_spi_err_check(struct mmc_card *card)
|
|
{
|
|
u32 status = 0;
|
|
int err;
|
|
|
|
/*
|
|
* SPI does not have a TRAN state we have to wait on, instead the
|
|
* card is ready again when it no longer holds the line LOW.
|
|
* We still have to ensure two things here before we know the write
|
|
* was successful:
|
|
* 1. The card has not disconnected during busy and we actually read our
|
|
* own pull-up, thinking it was still connected, so ensure it
|
|
* still responds.
|
|
* 2. Check for any error bits, in particular R1_SPI_IDLE to catch a
|
|
* just reconnected card after being disconnected during busy.
|
|
*/
|
|
err = __mmc_send_status(card, &status, 0);
|
|
if (err)
|
|
return err;
|
|
/* All R1 and R2 bits of SPI are errors in our case */
|
|
if (status)
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
static int mmc_blk_busy_cb(void *cb_data, bool *busy)
|
|
{
|
|
struct mmc_blk_busy_data *data = cb_data;
|
|
u32 status = 0;
|
|
int err;
|
|
|
|
err = mmc_send_status(data->card, &status);
|
|
if (err)
|
|
return err;
|
|
|
|
/* Accumulate response error bits. */
|
|
data->status |= status;
|
|
|
|
*busy = !mmc_ready_for_data(status);
|
|
return 0;
|
|
}
|
|
|
|
static int mmc_blk_card_busy(struct mmc_card *card, struct request *req)
|
|
{
|
|
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
|
|
struct mmc_blk_busy_data cb_data;
|
|
int err;
|
|
|
|
if (rq_data_dir(req) == READ)
|
|
return 0;
|
|
|
|
if (mmc_host_is_spi(card->host)) {
|
|
err = mmc_spi_err_check(card);
|
|
if (err)
|
|
mqrq->brq.data.bytes_xfered = 0;
|
|
return err;
|
|
}
|
|
|
|
cb_data.card = card;
|
|
cb_data.status = 0;
|
|
err = __mmc_poll_for_busy(card->host, 0, MMC_BLK_TIMEOUT_MS,
|
|
&mmc_blk_busy_cb, &cb_data);
|
|
|
|
/*
|
|
* Do not assume data transferred correctly if there are any error bits
|
|
* set.
|
|
*/
|
|
if (cb_data.status & mmc_blk_stop_err_bits(&mqrq->brq)) {
|
|
mqrq->brq.data.bytes_xfered = 0;
|
|
err = err ? err : -EIO;
|
|
}
|
|
|
|
/* Copy the exception bit so it will be seen later on */
|
|
if (mmc_card_mmc(card) && cb_data.status & R1_EXCEPTION_EVENT)
|
|
mqrq->brq.cmd.resp[0] |= R1_EXCEPTION_EVENT;
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline void mmc_blk_rw_reset_success(struct mmc_queue *mq,
|
|
struct request *req)
|
|
{
|
|
int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
|
|
|
|
mmc_blk_reset_success(mq->blkdata, type);
|
|
}
|
|
|
|
static void mmc_blk_mq_complete_rq(struct mmc_queue *mq, struct request *req)
|
|
{
|
|
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
|
|
unsigned int nr_bytes = mqrq->brq.data.bytes_xfered;
|
|
|
|
if (nr_bytes) {
|
|
if (blk_update_request(req, BLK_STS_OK, nr_bytes))
|
|
blk_mq_requeue_request(req, true);
|
|
else
|
|
__blk_mq_end_request(req, BLK_STS_OK);
|
|
} else if (!blk_rq_bytes(req)) {
|
|
__blk_mq_end_request(req, BLK_STS_IOERR);
|
|
} else if (mqrq->retries++ < MMC_MAX_RETRIES) {
|
|
blk_mq_requeue_request(req, true);
|
|
} else {
|
|
if (mmc_card_removed(mq->card))
|
|
req->rq_flags |= RQF_QUIET;
|
|
blk_mq_end_request(req, BLK_STS_IOERR);
|
|
}
|
|
}
|
|
|
|
static bool mmc_blk_urgent_bkops_needed(struct mmc_queue *mq,
|
|
struct mmc_queue_req *mqrq)
|
|
{
|
|
return mmc_card_mmc(mq->card) && !mmc_host_is_spi(mq->card->host) &&
|
|
(mqrq->brq.cmd.resp[0] & R1_EXCEPTION_EVENT ||
|
|
mqrq->brq.stop.resp[0] & R1_EXCEPTION_EVENT);
|
|
}
|
|
|
|
static void mmc_blk_urgent_bkops(struct mmc_queue *mq,
|
|
struct mmc_queue_req *mqrq)
|
|
{
|
|
if (mmc_blk_urgent_bkops_needed(mq, mqrq))
|
|
mmc_run_bkops(mq->card);
|
|
}
|
|
|
|
static void mmc_blk_hsq_req_done(struct mmc_request *mrq)
|
|
{
|
|
struct mmc_queue_req *mqrq =
|
|
container_of(mrq, struct mmc_queue_req, brq.mrq);
|
|
struct request *req = mmc_queue_req_to_req(mqrq);
|
|
struct request_queue *q = req->q;
|
|
struct mmc_queue *mq = q->queuedata;
|
|
struct mmc_host *host = mq->card->host;
|
|
unsigned long flags;
|
|
|
|
if (mmc_blk_rq_error(&mqrq->brq) ||
|
|
mmc_blk_urgent_bkops_needed(mq, mqrq)) {
|
|
spin_lock_irqsave(&mq->lock, flags);
|
|
mq->recovery_needed = true;
|
|
mq->recovery_req = req;
|
|
spin_unlock_irqrestore(&mq->lock, flags);
|
|
|
|
host->cqe_ops->cqe_recovery_start(host);
|
|
|
|
schedule_work(&mq->recovery_work);
|
|
return;
|
|
}
|
|
|
|
mmc_blk_rw_reset_success(mq, req);
|
|
|
|
/*
|
|
* Block layer timeouts race with completions which means the normal
|
|
* completion path cannot be used during recovery.
|
|
*/
|
|
if (mq->in_recovery)
|
|
mmc_blk_cqe_complete_rq(mq, req);
|
|
else if (likely(!blk_should_fake_timeout(req->q)))
|
|
blk_mq_complete_request(req);
|
|
}
|
|
|
|
void mmc_blk_mq_complete(struct request *req)
|
|
{
|
|
struct mmc_queue *mq = req->q->queuedata;
|
|
struct mmc_host *host = mq->card->host;
|
|
|
|
if (host->cqe_enabled)
|
|
mmc_blk_cqe_complete_rq(mq, req);
|
|
else if (likely(!blk_should_fake_timeout(req->q)))
|
|
mmc_blk_mq_complete_rq(mq, req);
|
|
}
|
|
|
|
static void mmc_blk_mq_poll_completion(struct mmc_queue *mq,
|
|
struct request *req)
|
|
{
|
|
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
|
|
struct mmc_host *host = mq->card->host;
|
|
|
|
if (mmc_blk_rq_error(&mqrq->brq) ||
|
|
mmc_blk_card_busy(mq->card, req)) {
|
|
mmc_blk_mq_rw_recovery(mq, req);
|
|
} else {
|
|
mmc_blk_rw_reset_success(mq, req);
|
|
mmc_retune_release(host);
|
|
}
|
|
|
|
mmc_blk_urgent_bkops(mq, mqrq);
|
|
}
|
|
|
|
static void mmc_blk_mq_dec_in_flight(struct mmc_queue *mq, struct request *req)
|
|
{
|
|
unsigned long flags;
|
|
bool put_card;
|
|
|
|
spin_lock_irqsave(&mq->lock, flags);
|
|
|
|
mq->in_flight[mmc_issue_type(mq, req)] -= 1;
|
|
|
|
put_card = (mmc_tot_in_flight(mq) == 0);
|
|
|
|
spin_unlock_irqrestore(&mq->lock, flags);
|
|
|
|
if (put_card)
|
|
mmc_put_card(mq->card, &mq->ctx);
|
|
}
|
|
|
|
static void mmc_blk_mq_post_req(struct mmc_queue *mq, struct request *req,
|
|
bool can_sleep)
|
|
{
|
|
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
|
|
struct mmc_request *mrq = &mqrq->brq.mrq;
|
|
struct mmc_host *host = mq->card->host;
|
|
|
|
mmc_post_req(host, mrq, 0);
|
|
|
|
/*
|
|
* Block layer timeouts race with completions which means the normal
|
|
* completion path cannot be used during recovery.
|
|
*/
|
|
if (mq->in_recovery) {
|
|
mmc_blk_mq_complete_rq(mq, req);
|
|
} else if (likely(!blk_should_fake_timeout(req->q))) {
|
|
if (can_sleep)
|
|
blk_mq_complete_request_direct(req, mmc_blk_mq_complete);
|
|
else
|
|
blk_mq_complete_request(req);
|
|
}
|
|
|
|
mmc_blk_mq_dec_in_flight(mq, req);
|
|
}
|
|
|
|
void mmc_blk_mq_recovery(struct mmc_queue *mq)
|
|
{
|
|
struct request *req = mq->recovery_req;
|
|
struct mmc_host *host = mq->card->host;
|
|
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
|
|
|
|
mq->recovery_req = NULL;
|
|
mq->rw_wait = false;
|
|
|
|
if (mmc_blk_rq_error(&mqrq->brq)) {
|
|
mmc_retune_hold_now(host);
|
|
mmc_blk_mq_rw_recovery(mq, req);
|
|
}
|
|
|
|
mmc_blk_urgent_bkops(mq, mqrq);
|
|
|
|
mmc_blk_mq_post_req(mq, req, true);
|
|
}
|
|
|
|
static void mmc_blk_mq_complete_prev_req(struct mmc_queue *mq,
|
|
struct request **prev_req)
|
|
{
|
|
if (mmc_host_done_complete(mq->card->host))
|
|
return;
|
|
|
|
mutex_lock(&mq->complete_lock);
|
|
|
|
if (!mq->complete_req)
|
|
goto out_unlock;
|
|
|
|
mmc_blk_mq_poll_completion(mq, mq->complete_req);
|
|
|
|
if (prev_req)
|
|
*prev_req = mq->complete_req;
|
|
else
|
|
mmc_blk_mq_post_req(mq, mq->complete_req, true);
|
|
|
|
mq->complete_req = NULL;
|
|
|
|
out_unlock:
|
|
mutex_unlock(&mq->complete_lock);
|
|
}
|
|
|
|
void mmc_blk_mq_complete_work(struct work_struct *work)
|
|
{
|
|
struct mmc_queue *mq = container_of(work, struct mmc_queue,
|
|
complete_work);
|
|
|
|
mmc_blk_mq_complete_prev_req(mq, NULL);
|
|
}
|
|
|
|
static void mmc_blk_mq_req_done(struct mmc_request *mrq)
|
|
{
|
|
struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
|
|
brq.mrq);
|
|
struct request *req = mmc_queue_req_to_req(mqrq);
|
|
struct request_queue *q = req->q;
|
|
struct mmc_queue *mq = q->queuedata;
|
|
struct mmc_host *host = mq->card->host;
|
|
unsigned long flags;
|
|
|
|
if (!mmc_host_done_complete(host)) {
|
|
bool waiting;
|
|
|
|
/*
|
|
* We cannot complete the request in this context, so record
|
|
* that there is a request to complete, and that a following
|
|
* request does not need to wait (although it does need to
|
|
* complete complete_req first).
|
|
*/
|
|
spin_lock_irqsave(&mq->lock, flags);
|
|
mq->complete_req = req;
|
|
mq->rw_wait = false;
|
|
waiting = mq->waiting;
|
|
spin_unlock_irqrestore(&mq->lock, flags);
|
|
|
|
/*
|
|
* If 'waiting' then the waiting task will complete this
|
|
* request, otherwise queue a work to do it. Note that
|
|
* complete_work may still race with the dispatch of a following
|
|
* request.
|
|
*/
|
|
if (waiting)
|
|
wake_up(&mq->wait);
|
|
else
|
|
queue_work(mq->card->complete_wq, &mq->complete_work);
|
|
|
|
return;
|
|
}
|
|
|
|
/* Take the recovery path for errors or urgent background operations */
|
|
if (mmc_blk_rq_error(&mqrq->brq) ||
|
|
mmc_blk_urgent_bkops_needed(mq, mqrq)) {
|
|
spin_lock_irqsave(&mq->lock, flags);
|
|
mq->recovery_needed = true;
|
|
mq->recovery_req = req;
|
|
spin_unlock_irqrestore(&mq->lock, flags);
|
|
wake_up(&mq->wait);
|
|
schedule_work(&mq->recovery_work);
|
|
return;
|
|
}
|
|
|
|
mmc_blk_rw_reset_success(mq, req);
|
|
|
|
mq->rw_wait = false;
|
|
wake_up(&mq->wait);
|
|
|
|
/* context unknown */
|
|
mmc_blk_mq_post_req(mq, req, false);
|
|
}
|
|
|
|
static bool mmc_blk_rw_wait_cond(struct mmc_queue *mq, int *err)
|
|
{
|
|
unsigned long flags;
|
|
bool done;
|
|
|
|
/*
|
|
* Wait while there is another request in progress, but not if recovery
|
|
* is needed. Also indicate whether there is a request waiting to start.
|
|
*/
|
|
spin_lock_irqsave(&mq->lock, flags);
|
|
if (mq->recovery_needed) {
|
|
*err = -EBUSY;
|
|
done = true;
|
|
} else {
|
|
done = !mq->rw_wait;
|
|
}
|
|
mq->waiting = !done;
|
|
spin_unlock_irqrestore(&mq->lock, flags);
|
|
|
|
return done;
|
|
}
|
|
|
|
static int mmc_blk_rw_wait(struct mmc_queue *mq, struct request **prev_req)
|
|
{
|
|
int err = 0;
|
|
|
|
wait_event(mq->wait, mmc_blk_rw_wait_cond(mq, &err));
|
|
|
|
/* Always complete the previous request if there is one */
|
|
mmc_blk_mq_complete_prev_req(mq, prev_req);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int mmc_blk_mq_issue_rw_rq(struct mmc_queue *mq,
|
|
struct request *req)
|
|
{
|
|
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
|
|
struct mmc_host *host = mq->card->host;
|
|
struct request *prev_req = NULL;
|
|
int err = 0;
|
|
|
|
mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
|
|
|
|
mqrq->brq.mrq.done = mmc_blk_mq_req_done;
|
|
|
|
mmc_pre_req(host, &mqrq->brq.mrq);
|
|
|
|
err = mmc_blk_rw_wait(mq, &prev_req);
|
|
if (err)
|
|
goto out_post_req;
|
|
|
|
mq->rw_wait = true;
|
|
|
|
err = mmc_start_request(host, &mqrq->brq.mrq);
|
|
|
|
if (prev_req)
|
|
mmc_blk_mq_post_req(mq, prev_req, true);
|
|
|
|
if (err)
|
|
mq->rw_wait = false;
|
|
|
|
/* Release re-tuning here where there is no synchronization required */
|
|
if (err || mmc_host_done_complete(host))
|
|
mmc_retune_release(host);
|
|
|
|
out_post_req:
|
|
if (err)
|
|
mmc_post_req(host, &mqrq->brq.mrq, err);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int mmc_blk_wait_for_idle(struct mmc_queue *mq, struct mmc_host *host)
|
|
{
|
|
if (host->cqe_enabled)
|
|
return host->cqe_ops->cqe_wait_for_idle(host);
|
|
|
|
return mmc_blk_rw_wait(mq, NULL);
|
|
}
|
|
|
|
enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req)
|
|
{
|
|
struct mmc_blk_data *md = mq->blkdata;
|
|
struct mmc_card *card = md->queue.card;
|
|
struct mmc_host *host = card->host;
|
|
int ret;
|
|
|
|
ret = mmc_blk_part_switch(card, md->part_type);
|
|
if (ret)
|
|
return MMC_REQ_FAILED_TO_START;
|
|
|
|
switch (mmc_issue_type(mq, req)) {
|
|
case MMC_ISSUE_SYNC:
|
|
ret = mmc_blk_wait_for_idle(mq, host);
|
|
if (ret)
|
|
return MMC_REQ_BUSY;
|
|
switch (req_op(req)) {
|
|
case REQ_OP_DRV_IN:
|
|
case REQ_OP_DRV_OUT:
|
|
mmc_blk_issue_drv_op(mq, req);
|
|
break;
|
|
case REQ_OP_DISCARD:
|
|
mmc_blk_issue_discard_rq(mq, req);
|
|
break;
|
|
case REQ_OP_SECURE_ERASE:
|
|
mmc_blk_issue_secdiscard_rq(mq, req);
|
|
break;
|
|
case REQ_OP_FLUSH:
|
|
mmc_blk_issue_flush(mq, req);
|
|
break;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
return MMC_REQ_FAILED_TO_START;
|
|
}
|
|
return MMC_REQ_FINISHED;
|
|
case MMC_ISSUE_DCMD:
|
|
case MMC_ISSUE_ASYNC:
|
|
switch (req_op(req)) {
|
|
case REQ_OP_FLUSH:
|
|
if (!mmc_cache_enabled(host)) {
|
|
blk_mq_end_request(req, BLK_STS_OK);
|
|
return MMC_REQ_FINISHED;
|
|
}
|
|
ret = mmc_blk_cqe_issue_flush(mq, req);
|
|
break;
|
|
case REQ_OP_READ:
|
|
case REQ_OP_WRITE:
|
|
if (host->cqe_enabled)
|
|
ret = mmc_blk_cqe_issue_rw_rq(mq, req);
|
|
else
|
|
ret = mmc_blk_mq_issue_rw_rq(mq, req);
|
|
break;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
ret = -EINVAL;
|
|
}
|
|
if (!ret)
|
|
return MMC_REQ_STARTED;
|
|
return ret == -EBUSY ? MMC_REQ_BUSY : MMC_REQ_FAILED_TO_START;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
return MMC_REQ_FAILED_TO_START;
|
|
}
|
|
}
|
|
|
|
static inline int mmc_blk_readonly(struct mmc_card *card)
|
|
{
|
|
return mmc_card_readonly(card) ||
|
|
!(card->csd.cmdclass & CCC_BLOCK_WRITE);
|
|
}
|
|
|
|
static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
|
|
struct device *parent,
|
|
sector_t size,
|
|
bool default_ro,
|
|
const char *subname,
|
|
int area_type,
|
|
unsigned int part_type)
|
|
{
|
|
struct mmc_blk_data *md;
|
|
int devidx, ret;
|
|
char cap_str[10];
|
|
bool cache_enabled = false;
|
|
bool fua_enabled = false;
|
|
|
|
devidx = ida_simple_get(&mmc_blk_ida, 0, max_devices, GFP_KERNEL);
|
|
if (devidx < 0) {
|
|
/*
|
|
* We get -ENOSPC because there are no more any available
|
|
* devidx. The reason may be that, either userspace haven't yet
|
|
* unmounted the partitions, which postpones mmc_blk_release()
|
|
* from being called, or the device has more partitions than
|
|
* what we support.
|
|
*/
|
|
if (devidx == -ENOSPC)
|
|
dev_err(mmc_dev(card->host),
|
|
"no more device IDs available\n");
|
|
|
|
return ERR_PTR(devidx);
|
|
}
|
|
|
|
md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
|
|
if (!md) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
md->area_type = area_type;
|
|
|
|
/*
|
|
* Set the read-only status based on the supported commands
|
|
* and the write protect switch.
|
|
*/
|
|
md->read_only = mmc_blk_readonly(card);
|
|
|
|
md->disk = mmc_init_queue(&md->queue, card);
|
|
if (IS_ERR(md->disk)) {
|
|
ret = PTR_ERR(md->disk);
|
|
goto err_kfree;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&md->part);
|
|
INIT_LIST_HEAD(&md->rpmbs);
|
|
kref_init(&md->kref);
|
|
|
|
md->queue.blkdata = md;
|
|
md->part_type = part_type;
|
|
|
|
md->disk->major = MMC_BLOCK_MAJOR;
|
|
md->disk->minors = perdev_minors;
|
|
md->disk->first_minor = devidx * perdev_minors;
|
|
md->disk->fops = &mmc_bdops;
|
|
md->disk->private_data = md;
|
|
md->parent = parent;
|
|
set_disk_ro(md->disk, md->read_only || default_ro);
|
|
if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
|
|
md->disk->flags |= GENHD_FL_NO_PART;
|
|
|
|
/*
|
|
* As discussed on lkml, GENHD_FL_REMOVABLE should:
|
|
*
|
|
* - be set for removable media with permanent block devices
|
|
* - be unset for removable block devices with permanent media
|
|
*
|
|
* Since MMC block devices clearly fall under the second
|
|
* case, we do not set GENHD_FL_REMOVABLE. Userspace
|
|
* should use the block device creation/destruction hotplug
|
|
* messages to tell when the card is present.
|
|
*/
|
|
|
|
snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
|
|
"mmcblk%u%s", card->host->index, subname ? subname : "");
|
|
|
|
set_capacity(md->disk, size);
|
|
|
|
if (mmc_host_cmd23(card->host)) {
|
|
if ((mmc_card_mmc(card) &&
|
|
card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
|
|
(mmc_card_sd(card) &&
|
|
card->scr.cmds & SD_SCR_CMD23_SUPPORT))
|
|
md->flags |= MMC_BLK_CMD23;
|
|
}
|
|
|
|
if (md->flags & MMC_BLK_CMD23 &&
|
|
((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
|
|
card->ext_csd.rel_sectors)) {
|
|
md->flags |= MMC_BLK_REL_WR;
|
|
fua_enabled = true;
|
|
cache_enabled = true;
|
|
}
|
|
if (mmc_cache_enabled(card->host))
|
|
cache_enabled = true;
|
|
|
|
blk_queue_write_cache(md->queue.queue, cache_enabled, fua_enabled);
|
|
|
|
string_get_size((u64)size, 512, STRING_UNITS_2,
|
|
cap_str, sizeof(cap_str));
|
|
pr_info("%s: %s %s %s %s\n",
|
|
md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
|
|
cap_str, md->read_only ? "(ro)" : "");
|
|
|
|
/* used in ->open, must be set before add_disk: */
|
|
if (area_type == MMC_BLK_DATA_AREA_MAIN)
|
|
dev_set_drvdata(&card->dev, md);
|
|
ret = device_add_disk(md->parent, md->disk, mmc_disk_attr_groups);
|
|
if (ret)
|
|
goto err_cleanup_queue;
|
|
return md;
|
|
|
|
err_cleanup_queue:
|
|
blk_cleanup_queue(md->disk->queue);
|
|
blk_mq_free_tag_set(&md->queue.tag_set);
|
|
err_kfree:
|
|
kfree(md);
|
|
out:
|
|
ida_simple_remove(&mmc_blk_ida, devidx);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
|
|
{
|
|
sector_t size;
|
|
|
|
if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
|
|
/*
|
|
* The EXT_CSD sector count is in number or 512 byte
|
|
* sectors.
|
|
*/
|
|
size = card->ext_csd.sectors;
|
|
} else {
|
|
/*
|
|
* The CSD capacity field is in units of read_blkbits.
|
|
* set_capacity takes units of 512 bytes.
|
|
*/
|
|
size = (typeof(sector_t))card->csd.capacity
|
|
<< (card->csd.read_blkbits - 9);
|
|
}
|
|
|
|
return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
|
|
MMC_BLK_DATA_AREA_MAIN, 0);
|
|
}
|
|
|
|
static int mmc_blk_alloc_part(struct mmc_card *card,
|
|
struct mmc_blk_data *md,
|
|
unsigned int part_type,
|
|
sector_t size,
|
|
bool default_ro,
|
|
const char *subname,
|
|
int area_type)
|
|
{
|
|
struct mmc_blk_data *part_md;
|
|
|
|
part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
|
|
subname, area_type, part_type);
|
|
if (IS_ERR(part_md))
|
|
return PTR_ERR(part_md);
|
|
list_add(&part_md->part, &md->part);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mmc_rpmb_ioctl() - ioctl handler for the RPMB chardev
|
|
* @filp: the character device file
|
|
* @cmd: the ioctl() command
|
|
* @arg: the argument from userspace
|
|
*
|
|
* This will essentially just redirect the ioctl()s coming in over to
|
|
* the main block device spawning the RPMB character device.
|
|
*/
|
|
static long mmc_rpmb_ioctl(struct file *filp, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct mmc_rpmb_data *rpmb = filp->private_data;
|
|
int ret;
|
|
|
|
switch (cmd) {
|
|
case MMC_IOC_CMD:
|
|
ret = mmc_blk_ioctl_cmd(rpmb->md,
|
|
(struct mmc_ioc_cmd __user *)arg,
|
|
rpmb);
|
|
break;
|
|
case MMC_IOC_MULTI_CMD:
|
|
ret = mmc_blk_ioctl_multi_cmd(rpmb->md,
|
|
(struct mmc_ioc_multi_cmd __user *)arg,
|
|
rpmb);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long mmc_rpmb_ioctl_compat(struct file *filp, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
return mmc_rpmb_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
|
|
}
|
|
#endif
|
|
|
|
static int mmc_rpmb_chrdev_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
|
|
struct mmc_rpmb_data, chrdev);
|
|
|
|
get_device(&rpmb->dev);
|
|
filp->private_data = rpmb;
|
|
mmc_blk_get(rpmb->md->disk);
|
|
|
|
return nonseekable_open(inode, filp);
|
|
}
|
|
|
|
static int mmc_rpmb_chrdev_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
|
|
struct mmc_rpmb_data, chrdev);
|
|
|
|
mmc_blk_put(rpmb->md);
|
|
put_device(&rpmb->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations mmc_rpmb_fileops = {
|
|
.release = mmc_rpmb_chrdev_release,
|
|
.open = mmc_rpmb_chrdev_open,
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.unlocked_ioctl = mmc_rpmb_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = mmc_rpmb_ioctl_compat,
|
|
#endif
|
|
};
|
|
|
|
static void mmc_blk_rpmb_device_release(struct device *dev)
|
|
{
|
|
struct mmc_rpmb_data *rpmb = dev_get_drvdata(dev);
|
|
|
|
ida_simple_remove(&mmc_rpmb_ida, rpmb->id);
|
|
kfree(rpmb);
|
|
}
|
|
|
|
static int mmc_blk_alloc_rpmb_part(struct mmc_card *card,
|
|
struct mmc_blk_data *md,
|
|
unsigned int part_index,
|
|
sector_t size,
|
|
const char *subname)
|
|
{
|
|
int devidx, ret;
|
|
char rpmb_name[DISK_NAME_LEN];
|
|
char cap_str[10];
|
|
struct mmc_rpmb_data *rpmb;
|
|
|
|
/* This creates the minor number for the RPMB char device */
|
|
devidx = ida_simple_get(&mmc_rpmb_ida, 0, max_devices, GFP_KERNEL);
|
|
if (devidx < 0)
|
|
return devidx;
|
|
|
|
rpmb = kzalloc(sizeof(*rpmb), GFP_KERNEL);
|
|
if (!rpmb) {
|
|
ida_simple_remove(&mmc_rpmb_ida, devidx);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
snprintf(rpmb_name, sizeof(rpmb_name),
|
|
"mmcblk%u%s", card->host->index, subname ? subname : "");
|
|
|
|
rpmb->id = devidx;
|
|
rpmb->part_index = part_index;
|
|
rpmb->dev.init_name = rpmb_name;
|
|
rpmb->dev.bus = &mmc_rpmb_bus_type;
|
|
rpmb->dev.devt = MKDEV(MAJOR(mmc_rpmb_devt), rpmb->id);
|
|
rpmb->dev.parent = &card->dev;
|
|
rpmb->dev.release = mmc_blk_rpmb_device_release;
|
|
device_initialize(&rpmb->dev);
|
|
dev_set_drvdata(&rpmb->dev, rpmb);
|
|
rpmb->md = md;
|
|
|
|
cdev_init(&rpmb->chrdev, &mmc_rpmb_fileops);
|
|
rpmb->chrdev.owner = THIS_MODULE;
|
|
ret = cdev_device_add(&rpmb->chrdev, &rpmb->dev);
|
|
if (ret) {
|
|
pr_err("%s: could not add character device\n", rpmb_name);
|
|
goto out_put_device;
|
|
}
|
|
|
|
list_add(&rpmb->node, &md->rpmbs);
|
|
|
|
string_get_size((u64)size, 512, STRING_UNITS_2,
|
|
cap_str, sizeof(cap_str));
|
|
|
|
pr_info("%s: %s %s %s, chardev (%d:%d)\n",
|
|
rpmb_name, mmc_card_id(card), mmc_card_name(card), cap_str,
|
|
MAJOR(mmc_rpmb_devt), rpmb->id);
|
|
|
|
return 0;
|
|
|
|
out_put_device:
|
|
put_device(&rpmb->dev);
|
|
return ret;
|
|
}
|
|
|
|
static void mmc_blk_remove_rpmb_part(struct mmc_rpmb_data *rpmb)
|
|
|
|
{
|
|
cdev_device_del(&rpmb->chrdev, &rpmb->dev);
|
|
put_device(&rpmb->dev);
|
|
}
|
|
|
|
/* MMC Physical partitions consist of two boot partitions and
|
|
* up to four general purpose partitions.
|
|
* For each partition enabled in EXT_CSD a block device will be allocatedi
|
|
* to provide access to the partition.
|
|
*/
|
|
|
|
static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
|
|
{
|
|
int idx, ret;
|
|
|
|
if (!mmc_card_mmc(card))
|
|
return 0;
|
|
|
|
for (idx = 0; idx < card->nr_parts; idx++) {
|
|
if (card->part[idx].area_type & MMC_BLK_DATA_AREA_RPMB) {
|
|
/*
|
|
* RPMB partitions does not provide block access, they
|
|
* are only accessed using ioctl():s. Thus create
|
|
* special RPMB block devices that do not have a
|
|
* backing block queue for these.
|
|
*/
|
|
ret = mmc_blk_alloc_rpmb_part(card, md,
|
|
card->part[idx].part_cfg,
|
|
card->part[idx].size >> 9,
|
|
card->part[idx].name);
|
|
if (ret)
|
|
return ret;
|
|
} else if (card->part[idx].size) {
|
|
ret = mmc_blk_alloc_part(card, md,
|
|
card->part[idx].part_cfg,
|
|
card->part[idx].size >> 9,
|
|
card->part[idx].force_ro,
|
|
card->part[idx].name,
|
|
card->part[idx].area_type);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mmc_blk_remove_req(struct mmc_blk_data *md)
|
|
{
|
|
/*
|
|
* Flush remaining requests and free queues. It is freeing the queue
|
|
* that stops new requests from being accepted.
|
|
*/
|
|
del_gendisk(md->disk);
|
|
mmc_cleanup_queue(&md->queue);
|
|
mmc_blk_put(md);
|
|
}
|
|
|
|
static void mmc_blk_remove_parts(struct mmc_card *card,
|
|
struct mmc_blk_data *md)
|
|
{
|
|
struct list_head *pos, *q;
|
|
struct mmc_blk_data *part_md;
|
|
struct mmc_rpmb_data *rpmb;
|
|
|
|
/* Remove RPMB partitions */
|
|
list_for_each_safe(pos, q, &md->rpmbs) {
|
|
rpmb = list_entry(pos, struct mmc_rpmb_data, node);
|
|
list_del(pos);
|
|
mmc_blk_remove_rpmb_part(rpmb);
|
|
}
|
|
/* Remove block partitions */
|
|
list_for_each_safe(pos, q, &md->part) {
|
|
part_md = list_entry(pos, struct mmc_blk_data, part);
|
|
list_del(pos);
|
|
mmc_blk_remove_req(part_md);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
|
|
static int mmc_dbg_card_status_get(void *data, u64 *val)
|
|
{
|
|
struct mmc_card *card = data;
|
|
struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
|
|
struct mmc_queue *mq = &md->queue;
|
|
struct request *req;
|
|
int ret;
|
|
|
|
/* Ask the block layer about the card status */
|
|
req = blk_mq_alloc_request(mq->queue, REQ_OP_DRV_IN, 0);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_CARD_STATUS;
|
|
blk_execute_rq(req, false);
|
|
ret = req_to_mmc_queue_req(req)->drv_op_result;
|
|
if (ret >= 0) {
|
|
*val = ret;
|
|
ret = 0;
|
|
}
|
|
blk_mq_free_request(req);
|
|
|
|
return ret;
|
|
}
|
|
DEFINE_DEBUGFS_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
|
|
NULL, "%08llx\n");
|
|
|
|
/* That is two digits * 512 + 1 for newline */
|
|
#define EXT_CSD_STR_LEN 1025
|
|
|
|
static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct mmc_card *card = inode->i_private;
|
|
struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
|
|
struct mmc_queue *mq = &md->queue;
|
|
struct request *req;
|
|
char *buf;
|
|
ssize_t n = 0;
|
|
u8 *ext_csd;
|
|
int err, i;
|
|
|
|
buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
/* Ask the block layer for the EXT CSD */
|
|
req = blk_mq_alloc_request(mq->queue, REQ_OP_DRV_IN, 0);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto out_free;
|
|
}
|
|
req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_EXT_CSD;
|
|
req_to_mmc_queue_req(req)->drv_op_data = &ext_csd;
|
|
blk_execute_rq(req, false);
|
|
err = req_to_mmc_queue_req(req)->drv_op_result;
|
|
blk_mq_free_request(req);
|
|
if (err) {
|
|
pr_err("FAILED %d\n", err);
|
|
goto out_free;
|
|
}
|
|
|
|
for (i = 0; i < 512; i++)
|
|
n += sprintf(buf + n, "%02x", ext_csd[i]);
|
|
n += sprintf(buf + n, "\n");
|
|
|
|
if (n != EXT_CSD_STR_LEN) {
|
|
err = -EINVAL;
|
|
kfree(ext_csd);
|
|
goto out_free;
|
|
}
|
|
|
|
filp->private_data = buf;
|
|
kfree(ext_csd);
|
|
return 0;
|
|
|
|
out_free:
|
|
kfree(buf);
|
|
return err;
|
|
}
|
|
|
|
static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
|
|
size_t cnt, loff_t *ppos)
|
|
{
|
|
char *buf = filp->private_data;
|
|
|
|
return simple_read_from_buffer(ubuf, cnt, ppos,
|
|
buf, EXT_CSD_STR_LEN);
|
|
}
|
|
|
|
static int mmc_ext_csd_release(struct inode *inode, struct file *file)
|
|
{
|
|
kfree(file->private_data);
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations mmc_dbg_ext_csd_fops = {
|
|
.open = mmc_ext_csd_open,
|
|
.read = mmc_ext_csd_read,
|
|
.release = mmc_ext_csd_release,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
|
|
{
|
|
struct dentry *root;
|
|
|
|
if (!card->debugfs_root)
|
|
return 0;
|
|
|
|
root = card->debugfs_root;
|
|
|
|
if (mmc_card_mmc(card) || mmc_card_sd(card)) {
|
|
md->status_dentry =
|
|
debugfs_create_file_unsafe("status", 0400, root,
|
|
card,
|
|
&mmc_dbg_card_status_fops);
|
|
if (!md->status_dentry)
|
|
return -EIO;
|
|
}
|
|
|
|
if (mmc_card_mmc(card)) {
|
|
md->ext_csd_dentry =
|
|
debugfs_create_file("ext_csd", S_IRUSR, root, card,
|
|
&mmc_dbg_ext_csd_fops);
|
|
if (!md->ext_csd_dentry)
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mmc_blk_remove_debugfs(struct mmc_card *card,
|
|
struct mmc_blk_data *md)
|
|
{
|
|
if (!card->debugfs_root)
|
|
return;
|
|
|
|
if (!IS_ERR_OR_NULL(md->status_dentry)) {
|
|
debugfs_remove(md->status_dentry);
|
|
md->status_dentry = NULL;
|
|
}
|
|
|
|
if (!IS_ERR_OR_NULL(md->ext_csd_dentry)) {
|
|
debugfs_remove(md->ext_csd_dentry);
|
|
md->ext_csd_dentry = NULL;
|
|
}
|
|
}
|
|
|
|
#else
|
|
|
|
static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void mmc_blk_remove_debugfs(struct mmc_card *card,
|
|
struct mmc_blk_data *md)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_DEBUG_FS */
|
|
|
|
static int mmc_blk_probe(struct mmc_card *card)
|
|
{
|
|
struct mmc_blk_data *md;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* Check that the card supports the command class(es) we need.
|
|
*/
|
|
if (!(card->csd.cmdclass & CCC_BLOCK_READ))
|
|
return -ENODEV;
|
|
|
|
mmc_fixup_device(card, mmc_blk_fixups);
|
|
|
|
card->complete_wq = alloc_workqueue("mmc_complete",
|
|
WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
|
|
if (!card->complete_wq) {
|
|
pr_err("Failed to create mmc completion workqueue");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
md = mmc_blk_alloc(card);
|
|
if (IS_ERR(md)) {
|
|
ret = PTR_ERR(md);
|
|
goto out_free;
|
|
}
|
|
|
|
ret = mmc_blk_alloc_parts(card, md);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* Add two debugfs entries */
|
|
mmc_blk_add_debugfs(card, md);
|
|
|
|
pm_runtime_set_autosuspend_delay(&card->dev, 3000);
|
|
pm_runtime_use_autosuspend(&card->dev);
|
|
|
|
/*
|
|
* Don't enable runtime PM for SD-combo cards here. Leave that
|
|
* decision to be taken during the SDIO init sequence instead.
|
|
*/
|
|
if (card->type != MMC_TYPE_SD_COMBO) {
|
|
pm_runtime_set_active(&card->dev);
|
|
pm_runtime_enable(&card->dev);
|
|
}
|
|
|
|
return 0;
|
|
|
|
out:
|
|
mmc_blk_remove_parts(card, md);
|
|
mmc_blk_remove_req(md);
|
|
out_free:
|
|
destroy_workqueue(card->complete_wq);
|
|
return ret;
|
|
}
|
|
|
|
static void mmc_blk_remove(struct mmc_card *card)
|
|
{
|
|
struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
|
|
|
|
mmc_blk_remove_debugfs(card, md);
|
|
mmc_blk_remove_parts(card, md);
|
|
pm_runtime_get_sync(&card->dev);
|
|
if (md->part_curr != md->part_type) {
|
|
mmc_claim_host(card->host);
|
|
mmc_blk_part_switch(card, md->part_type);
|
|
mmc_release_host(card->host);
|
|
}
|
|
if (card->type != MMC_TYPE_SD_COMBO)
|
|
pm_runtime_disable(&card->dev);
|
|
pm_runtime_put_noidle(&card->dev);
|
|
mmc_blk_remove_req(md);
|
|
dev_set_drvdata(&card->dev, NULL);
|
|
destroy_workqueue(card->complete_wq);
|
|
}
|
|
|
|
static int _mmc_blk_suspend(struct mmc_card *card)
|
|
{
|
|
struct mmc_blk_data *part_md;
|
|
struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
|
|
|
|
if (md) {
|
|
mmc_queue_suspend(&md->queue);
|
|
list_for_each_entry(part_md, &md->part, part) {
|
|
mmc_queue_suspend(&part_md->queue);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void mmc_blk_shutdown(struct mmc_card *card)
|
|
{
|
|
_mmc_blk_suspend(card);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int mmc_blk_suspend(struct device *dev)
|
|
{
|
|
struct mmc_card *card = mmc_dev_to_card(dev);
|
|
|
|
return _mmc_blk_suspend(card);
|
|
}
|
|
|
|
static int mmc_blk_resume(struct device *dev)
|
|
{
|
|
struct mmc_blk_data *part_md;
|
|
struct mmc_blk_data *md = dev_get_drvdata(dev);
|
|
|
|
if (md) {
|
|
/*
|
|
* Resume involves the card going into idle state,
|
|
* so current partition is always the main one.
|
|
*/
|
|
md->part_curr = md->part_type;
|
|
mmc_queue_resume(&md->queue);
|
|
list_for_each_entry(part_md, &md->part, part) {
|
|
mmc_queue_resume(&part_md->queue);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
|
|
|
|
static struct mmc_driver mmc_driver = {
|
|
.drv = {
|
|
.name = "mmcblk",
|
|
.pm = &mmc_blk_pm_ops,
|
|
},
|
|
.probe = mmc_blk_probe,
|
|
.remove = mmc_blk_remove,
|
|
.shutdown = mmc_blk_shutdown,
|
|
};
|
|
|
|
static int __init mmc_blk_init(void)
|
|
{
|
|
int res;
|
|
|
|
res = bus_register(&mmc_rpmb_bus_type);
|
|
if (res < 0) {
|
|
pr_err("mmcblk: could not register RPMB bus type\n");
|
|
return res;
|
|
}
|
|
res = alloc_chrdev_region(&mmc_rpmb_devt, 0, MAX_DEVICES, "rpmb");
|
|
if (res < 0) {
|
|
pr_err("mmcblk: failed to allocate rpmb chrdev region\n");
|
|
goto out_bus_unreg;
|
|
}
|
|
|
|
if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
|
|
pr_info("mmcblk: using %d minors per device\n", perdev_minors);
|
|
|
|
max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
|
|
|
|
res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
|
|
if (res)
|
|
goto out_chrdev_unreg;
|
|
|
|
res = mmc_register_driver(&mmc_driver);
|
|
if (res)
|
|
goto out_blkdev_unreg;
|
|
|
|
return 0;
|
|
|
|
out_blkdev_unreg:
|
|
unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
|
|
out_chrdev_unreg:
|
|
unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
|
|
out_bus_unreg:
|
|
bus_unregister(&mmc_rpmb_bus_type);
|
|
return res;
|
|
}
|
|
|
|
static void __exit mmc_blk_exit(void)
|
|
{
|
|
mmc_unregister_driver(&mmc_driver);
|
|
unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
|
|
unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
|
|
bus_unregister(&mmc_rpmb_bus_type);
|
|
}
|
|
|
|
module_init(mmc_blk_init);
|
|
module_exit(mmc_blk_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
|
|
|