linux-stable/drivers/fpga/dfl-fme-pr.c
Wei Yongjun 029d727b4f fpga: dfl: fme: fix return value check in in pr_mgmt_init()
In case of error, the function dfl_fme_create_region() returns ERR_PTR()
and never returns NULL. The NULL test in the return value check should
be replaced with IS_ERR().

Fixes: 29de76240e ("fpga: dfl: fme: add partial reconfiguration sub feature support")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Moritz Fischer <mdf@kernel.org>
Acked-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-09-12 09:31:00 +02:00

479 lines
12 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Driver for FPGA Management Engine (FME) Partial Reconfiguration
*
* Copyright (C) 2017-2018 Intel Corporation, Inc.
*
* Authors:
* Kang Luwei <luwei.kang@intel.com>
* Xiao Guangrong <guangrong.xiao@linux.intel.com>
* Wu Hao <hao.wu@intel.com>
* Joseph Grecco <joe.grecco@intel.com>
* Enno Luebbers <enno.luebbers@intel.com>
* Tim Whisonant <tim.whisonant@intel.com>
* Ananda Ravuri <ananda.ravuri@intel.com>
* Christopher Rauer <christopher.rauer@intel.com>
* Henry Mitchel <henry.mitchel@intel.com>
*/
#include <linux/types.h>
#include <linux/device.h>
#include <linux/vmalloc.h>
#include <linux/uaccess.h>
#include <linux/fpga/fpga-mgr.h>
#include <linux/fpga/fpga-bridge.h>
#include <linux/fpga/fpga-region.h>
#include <linux/fpga-dfl.h>
#include "dfl.h"
#include "dfl-fme.h"
#include "dfl-fme-pr.h"
static struct dfl_fme_region *
dfl_fme_region_find_by_port_id(struct dfl_fme *fme, int port_id)
{
struct dfl_fme_region *fme_region;
list_for_each_entry(fme_region, &fme->region_list, node)
if (fme_region->port_id == port_id)
return fme_region;
return NULL;
}
static int dfl_fme_region_match(struct device *dev, const void *data)
{
return dev->parent == data;
}
static struct fpga_region *dfl_fme_region_find(struct dfl_fme *fme, int port_id)
{
struct dfl_fme_region *fme_region;
struct fpga_region *region;
fme_region = dfl_fme_region_find_by_port_id(fme, port_id);
if (!fme_region)
return NULL;
region = fpga_region_class_find(NULL, &fme_region->region->dev,
dfl_fme_region_match);
if (!region)
return NULL;
return region;
}
static int fme_pr(struct platform_device *pdev, unsigned long arg)
{
struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
void __user *argp = (void __user *)arg;
struct dfl_fpga_fme_port_pr port_pr;
struct fpga_image_info *info;
struct fpga_region *region;
void __iomem *fme_hdr;
struct dfl_fme *fme;
unsigned long minsz;
void *buf = NULL;
int ret = 0;
u64 v;
minsz = offsetofend(struct dfl_fpga_fme_port_pr, buffer_address);
if (copy_from_user(&port_pr, argp, minsz))
return -EFAULT;
if (port_pr.argsz < minsz || port_pr.flags)
return -EINVAL;
if (!IS_ALIGNED(port_pr.buffer_size, 4))
return -EINVAL;
/* get fme header region */
fme_hdr = dfl_get_feature_ioaddr_by_id(&pdev->dev,
FME_FEATURE_ID_HEADER);
/* check port id */
v = readq(fme_hdr + FME_HDR_CAP);
if (port_pr.port_id >= FIELD_GET(FME_CAP_NUM_PORTS, v)) {
dev_dbg(&pdev->dev, "port number more than maximum\n");
return -EINVAL;
}
if (!access_ok(VERIFY_READ,
(void __user *)(unsigned long)port_pr.buffer_address,
port_pr.buffer_size))
return -EFAULT;
buf = vmalloc(port_pr.buffer_size);
if (!buf)
return -ENOMEM;
if (copy_from_user(buf,
(void __user *)(unsigned long)port_pr.buffer_address,
port_pr.buffer_size)) {
ret = -EFAULT;
goto free_exit;
}
/* prepare fpga_image_info for PR */
info = fpga_image_info_alloc(&pdev->dev);
if (!info) {
ret = -ENOMEM;
goto free_exit;
}
info->flags |= FPGA_MGR_PARTIAL_RECONFIG;
mutex_lock(&pdata->lock);
fme = dfl_fpga_pdata_get_private(pdata);
/* fme device has been unregistered. */
if (!fme) {
ret = -EINVAL;
goto unlock_exit;
}
region = dfl_fme_region_find(fme, port_pr.port_id);
if (!region) {
ret = -EINVAL;
goto unlock_exit;
}
fpga_image_info_free(region->info);
info->buf = buf;
info->count = port_pr.buffer_size;
info->region_id = port_pr.port_id;
region->info = info;
ret = fpga_region_program_fpga(region);
/*
* it allows userspace to reset the PR region's logic by disabling and
* reenabling the bridge to clear things out between accleration runs.
* so no need to hold the bridges after partial reconfiguration.
*/
if (region->get_bridges)
fpga_bridges_put(&region->bridge_list);
put_device(&region->dev);
unlock_exit:
mutex_unlock(&pdata->lock);
free_exit:
vfree(buf);
if (copy_to_user((void __user *)arg, &port_pr, minsz))
return -EFAULT;
return ret;
}
/**
* dfl_fme_create_mgr - create fpga mgr platform device as child device
*
* @pdata: fme platform_device's pdata
*
* Return: mgr platform device if successful, and error code otherwise.
*/
static struct platform_device *
dfl_fme_create_mgr(struct dfl_feature_platform_data *pdata,
struct dfl_feature *feature)
{
struct platform_device *mgr, *fme = pdata->dev;
struct dfl_fme_mgr_pdata mgr_pdata;
int ret = -ENOMEM;
if (!feature->ioaddr)
return ERR_PTR(-ENODEV);
mgr_pdata.ioaddr = feature->ioaddr;
/*
* Each FME has only one fpga-mgr, so allocate platform device using
* the same FME platform device id.
*/
mgr = platform_device_alloc(DFL_FPGA_FME_MGR, fme->id);
if (!mgr)
return ERR_PTR(ret);
mgr->dev.parent = &fme->dev;
ret = platform_device_add_data(mgr, &mgr_pdata, sizeof(mgr_pdata));
if (ret)
goto create_mgr_err;
ret = platform_device_add(mgr);
if (ret)
goto create_mgr_err;
return mgr;
create_mgr_err:
platform_device_put(mgr);
return ERR_PTR(ret);
}
/**
* dfl_fme_destroy_mgr - destroy fpga mgr platform device
* @pdata: fme platform device's pdata
*/
static void dfl_fme_destroy_mgr(struct dfl_feature_platform_data *pdata)
{
struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
platform_device_unregister(priv->mgr);
}
/**
* dfl_fme_create_bridge - create fme fpga bridge platform device as child
*
* @pdata: fme platform device's pdata
* @port_id: port id for the bridge to be created.
*
* Return: bridge platform device if successful, and error code otherwise.
*/
static struct dfl_fme_bridge *
dfl_fme_create_bridge(struct dfl_feature_platform_data *pdata, int port_id)
{
struct device *dev = &pdata->dev->dev;
struct dfl_fme_br_pdata br_pdata;
struct dfl_fme_bridge *fme_br;
int ret = -ENOMEM;
fme_br = devm_kzalloc(dev, sizeof(*fme_br), GFP_KERNEL);
if (!fme_br)
return ERR_PTR(ret);
br_pdata.cdev = pdata->dfl_cdev;
br_pdata.port_id = port_id;
fme_br->br = platform_device_alloc(DFL_FPGA_FME_BRIDGE,
PLATFORM_DEVID_AUTO);
if (!fme_br->br)
return ERR_PTR(ret);
fme_br->br->dev.parent = dev;
ret = platform_device_add_data(fme_br->br, &br_pdata, sizeof(br_pdata));
if (ret)
goto create_br_err;
ret = platform_device_add(fme_br->br);
if (ret)
goto create_br_err;
return fme_br;
create_br_err:
platform_device_put(fme_br->br);
return ERR_PTR(ret);
}
/**
* dfl_fme_destroy_bridge - destroy fpga bridge platform device
* @fme_br: fme bridge to destroy
*/
static void dfl_fme_destroy_bridge(struct dfl_fme_bridge *fme_br)
{
platform_device_unregister(fme_br->br);
}
/**
* dfl_fme_destroy_bridge - destroy all fpga bridge platform device
* @pdata: fme platform device's pdata
*/
static void dfl_fme_destroy_bridges(struct dfl_feature_platform_data *pdata)
{
struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
struct dfl_fme_bridge *fbridge, *tmp;
list_for_each_entry_safe(fbridge, tmp, &priv->bridge_list, node) {
list_del(&fbridge->node);
dfl_fme_destroy_bridge(fbridge);
}
}
/**
* dfl_fme_create_region - create fpga region platform device as child
*
* @pdata: fme platform device's pdata
* @mgr: mgr platform device needed for region
* @br: br platform device needed for region
* @port_id: port id
*
* Return: fme region if successful, and error code otherwise.
*/
static struct dfl_fme_region *
dfl_fme_create_region(struct dfl_feature_platform_data *pdata,
struct platform_device *mgr,
struct platform_device *br, int port_id)
{
struct dfl_fme_region_pdata region_pdata;
struct device *dev = &pdata->dev->dev;
struct dfl_fme_region *fme_region;
int ret = -ENOMEM;
fme_region = devm_kzalloc(dev, sizeof(*fme_region), GFP_KERNEL);
if (!fme_region)
return ERR_PTR(ret);
region_pdata.mgr = mgr;
region_pdata.br = br;
/*
* Each FPGA device may have more than one port, so allocate platform
* device using the same port platform device id.
*/
fme_region->region = platform_device_alloc(DFL_FPGA_FME_REGION, br->id);
if (!fme_region->region)
return ERR_PTR(ret);
fme_region->region->dev.parent = dev;
ret = platform_device_add_data(fme_region->region, &region_pdata,
sizeof(region_pdata));
if (ret)
goto create_region_err;
ret = platform_device_add(fme_region->region);
if (ret)
goto create_region_err;
fme_region->port_id = port_id;
return fme_region;
create_region_err:
platform_device_put(fme_region->region);
return ERR_PTR(ret);
}
/**
* dfl_fme_destroy_region - destroy fme region
* @fme_region: fme region to destroy
*/
static void dfl_fme_destroy_region(struct dfl_fme_region *fme_region)
{
platform_device_unregister(fme_region->region);
}
/**
* dfl_fme_destroy_regions - destroy all fme regions
* @pdata: fme platform device's pdata
*/
static void dfl_fme_destroy_regions(struct dfl_feature_platform_data *pdata)
{
struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
struct dfl_fme_region *fme_region, *tmp;
list_for_each_entry_safe(fme_region, tmp, &priv->region_list, node) {
list_del(&fme_region->node);
dfl_fme_destroy_region(fme_region);
}
}
static int pr_mgmt_init(struct platform_device *pdev,
struct dfl_feature *feature)
{
struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct dfl_fme_region *fme_region;
struct dfl_fme_bridge *fme_br;
struct platform_device *mgr;
struct dfl_fme *priv;
void __iomem *fme_hdr;
int ret = -ENODEV, i = 0;
u64 fme_cap, port_offset;
fme_hdr = dfl_get_feature_ioaddr_by_id(&pdev->dev,
FME_FEATURE_ID_HEADER);
mutex_lock(&pdata->lock);
priv = dfl_fpga_pdata_get_private(pdata);
/* Initialize the region and bridge sub device list */
INIT_LIST_HEAD(&priv->region_list);
INIT_LIST_HEAD(&priv->bridge_list);
/* Create fpga mgr platform device */
mgr = dfl_fme_create_mgr(pdata, feature);
if (IS_ERR(mgr)) {
dev_err(&pdev->dev, "fail to create fpga mgr pdev\n");
goto unlock;
}
priv->mgr = mgr;
/* Read capability register to check number of regions and bridges */
fme_cap = readq(fme_hdr + FME_HDR_CAP);
for (; i < FIELD_GET(FME_CAP_NUM_PORTS, fme_cap); i++) {
port_offset = readq(fme_hdr + FME_HDR_PORT_OFST(i));
if (!(port_offset & FME_PORT_OFST_IMP))
continue;
/* Create bridge for each port */
fme_br = dfl_fme_create_bridge(pdata, i);
if (IS_ERR(fme_br)) {
ret = PTR_ERR(fme_br);
goto destroy_region;
}
list_add(&fme_br->node, &priv->bridge_list);
/* Create region for each port */
fme_region = dfl_fme_create_region(pdata, mgr,
fme_br->br, i);
if (IS_ERR(fme_region)) {
ret = PTR_ERR(fme_region);
goto destroy_region;
}
list_add(&fme_region->node, &priv->region_list);
}
mutex_unlock(&pdata->lock);
return 0;
destroy_region:
dfl_fme_destroy_regions(pdata);
dfl_fme_destroy_bridges(pdata);
dfl_fme_destroy_mgr(pdata);
unlock:
mutex_unlock(&pdata->lock);
return ret;
}
static void pr_mgmt_uinit(struct platform_device *pdev,
struct dfl_feature *feature)
{
struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct dfl_fme *priv;
mutex_lock(&pdata->lock);
priv = dfl_fpga_pdata_get_private(pdata);
dfl_fme_destroy_regions(pdata);
dfl_fme_destroy_bridges(pdata);
dfl_fme_destroy_mgr(pdata);
mutex_unlock(&pdata->lock);
}
static long fme_pr_ioctl(struct platform_device *pdev,
struct dfl_feature *feature,
unsigned int cmd, unsigned long arg)
{
long ret;
switch (cmd) {
case DFL_FPGA_FME_PORT_PR:
ret = fme_pr(pdev, arg);
break;
default:
ret = -ENODEV;
}
return ret;
}
const struct dfl_feature_ops pr_mgmt_ops = {
.init = pr_mgmt_init,
.uinit = pr_mgmt_uinit,
.ioctl = fme_pr_ioctl,
};