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![Zhang Rui](/assets/img/avatar_default.png)
Well, first of all, I don't want to change so many files either. What I do: Adding a new parameter "struct bin_attribute *" in the .read/.write methods for the sysfs binary attributes. In fact, only the four lines change in fs/sysfs/bin.c and include/linux/sysfs.h do the real work. But I have to update all the files that use binary attributes to make them compatible with the new .read and .write methods. I'm not sure if I missed any. :( Why I do this: For a sysfs attribute, we can get a pointer pointing to the struct attribute in the .show/.store method, while we can't do this for the binary attributes. I don't know why this is different, but this does make it not so handy to use the binary attributes as the regular ones. So I think this patch is reasonable. :) Who benefits from it: The patch that exposes ACPI tables in sysfs requires such an improvement. All the table binary attributes share the same .read method. Parameter "struct bin_attribute *" is used to get the table signature and instance number which are used to distinguish different ACPI table binary attributes. Without this parameter, we need to offer different .read methods for different ACPI table binary attributes. This is impossible as there are various ACPI tables on different platforms, and we don't know what they are until they are loaded. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
661 lines
16 KiB
C
661 lines
16 KiB
C
/*
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* dcdbas.c: Dell Systems Management Base Driver
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*
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* The Dell Systems Management Base Driver provides a sysfs interface for
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* systems management software to perform System Management Interrupts (SMIs)
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* and Host Control Actions (power cycle or power off after OS shutdown) on
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* Dell systems.
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*
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* See Documentation/dcdbas.txt for more information.
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*
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* Copyright (C) 1995-2006 Dell Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License v2.0 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mc146818rtc.h>
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#include <linux/module.h>
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#include <linux/reboot.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include <asm/io.h>
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#include <asm/semaphore.h>
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#include "dcdbas.h"
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#define DRIVER_NAME "dcdbas"
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#define DRIVER_VERSION "5.6.0-3.2"
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#define DRIVER_DESCRIPTION "Dell Systems Management Base Driver"
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static struct platform_device *dcdbas_pdev;
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static u8 *smi_data_buf;
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static dma_addr_t smi_data_buf_handle;
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static unsigned long smi_data_buf_size;
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static u32 smi_data_buf_phys_addr;
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static DEFINE_MUTEX(smi_data_lock);
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static unsigned int host_control_action;
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static unsigned int host_control_smi_type;
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static unsigned int host_control_on_shutdown;
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/**
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* smi_data_buf_free: free SMI data buffer
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*/
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static void smi_data_buf_free(void)
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{
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if (!smi_data_buf)
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return;
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dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
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__FUNCTION__, smi_data_buf_phys_addr, smi_data_buf_size);
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dma_free_coherent(&dcdbas_pdev->dev, smi_data_buf_size, smi_data_buf,
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smi_data_buf_handle);
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smi_data_buf = NULL;
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smi_data_buf_handle = 0;
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smi_data_buf_phys_addr = 0;
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smi_data_buf_size = 0;
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}
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/**
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* smi_data_buf_realloc: grow SMI data buffer if needed
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*/
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static int smi_data_buf_realloc(unsigned long size)
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{
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void *buf;
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dma_addr_t handle;
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if (smi_data_buf_size >= size)
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return 0;
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if (size > MAX_SMI_DATA_BUF_SIZE)
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return -EINVAL;
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/* new buffer is needed */
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buf = dma_alloc_coherent(&dcdbas_pdev->dev, size, &handle, GFP_KERNEL);
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if (!buf) {
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dev_dbg(&dcdbas_pdev->dev,
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"%s: failed to allocate memory size %lu\n",
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__FUNCTION__, size);
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return -ENOMEM;
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}
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/* memory zeroed by dma_alloc_coherent */
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if (smi_data_buf)
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memcpy(buf, smi_data_buf, smi_data_buf_size);
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/* free any existing buffer */
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smi_data_buf_free();
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/* set up new buffer for use */
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smi_data_buf = buf;
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smi_data_buf_handle = handle;
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smi_data_buf_phys_addr = (u32) virt_to_phys(buf);
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smi_data_buf_size = size;
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dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
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__FUNCTION__, smi_data_buf_phys_addr, smi_data_buf_size);
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return 0;
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}
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static ssize_t smi_data_buf_phys_addr_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%x\n", smi_data_buf_phys_addr);
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}
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static ssize_t smi_data_buf_size_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%lu\n", smi_data_buf_size);
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}
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static ssize_t smi_data_buf_size_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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unsigned long buf_size;
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ssize_t ret;
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buf_size = simple_strtoul(buf, NULL, 10);
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/* make sure SMI data buffer is at least buf_size */
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mutex_lock(&smi_data_lock);
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ret = smi_data_buf_realloc(buf_size);
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mutex_unlock(&smi_data_lock);
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if (ret)
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return ret;
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return count;
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}
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static ssize_t smi_data_read(struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t pos, size_t count)
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{
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size_t max_read;
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ssize_t ret;
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mutex_lock(&smi_data_lock);
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if (pos >= smi_data_buf_size) {
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ret = 0;
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goto out;
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}
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max_read = smi_data_buf_size - pos;
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ret = min(max_read, count);
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memcpy(buf, smi_data_buf + pos, ret);
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out:
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mutex_unlock(&smi_data_lock);
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return ret;
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}
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static ssize_t smi_data_write(struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t pos, size_t count)
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{
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ssize_t ret;
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if ((pos + count) > MAX_SMI_DATA_BUF_SIZE)
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return -EINVAL;
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mutex_lock(&smi_data_lock);
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ret = smi_data_buf_realloc(pos + count);
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if (ret)
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goto out;
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memcpy(smi_data_buf + pos, buf, count);
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ret = count;
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out:
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mutex_unlock(&smi_data_lock);
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return ret;
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}
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static ssize_t host_control_action_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%u\n", host_control_action);
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}
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static ssize_t host_control_action_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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ssize_t ret;
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/* make sure buffer is available for host control command */
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mutex_lock(&smi_data_lock);
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ret = smi_data_buf_realloc(sizeof(struct apm_cmd));
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mutex_unlock(&smi_data_lock);
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if (ret)
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return ret;
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host_control_action = simple_strtoul(buf, NULL, 10);
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return count;
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}
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static ssize_t host_control_smi_type_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%u\n", host_control_smi_type);
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}
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static ssize_t host_control_smi_type_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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host_control_smi_type = simple_strtoul(buf, NULL, 10);
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return count;
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}
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static ssize_t host_control_on_shutdown_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%u\n", host_control_on_shutdown);
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}
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static ssize_t host_control_on_shutdown_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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host_control_on_shutdown = simple_strtoul(buf, NULL, 10);
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return count;
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}
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/**
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* smi_request: generate SMI request
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*
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* Called with smi_data_lock.
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*/
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static int smi_request(struct smi_cmd *smi_cmd)
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{
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cpumask_t old_mask;
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int ret = 0;
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if (smi_cmd->magic != SMI_CMD_MAGIC) {
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dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",
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__FUNCTION__);
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return -EBADR;
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}
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/* SMI requires CPU 0 */
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old_mask = current->cpus_allowed;
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set_cpus_allowed(current, cpumask_of_cpu(0));
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if (smp_processor_id() != 0) {
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dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
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__FUNCTION__);
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ret = -EBUSY;
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goto out;
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}
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/* generate SMI */
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asm volatile (
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"outb %b0,%w1"
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: /* no output args */
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: "a" (smi_cmd->command_code),
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"d" (smi_cmd->command_address),
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"b" (smi_cmd->ebx),
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"c" (smi_cmd->ecx)
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: "memory"
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);
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out:
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set_cpus_allowed(current, old_mask);
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return ret;
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}
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/**
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* smi_request_store:
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*
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* The valid values are:
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* 0: zero SMI data buffer
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* 1: generate calling interface SMI
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* 2: generate raw SMI
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*
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* User application writes smi_cmd to smi_data before telling driver
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* to generate SMI.
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*/
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static ssize_t smi_request_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct smi_cmd *smi_cmd;
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unsigned long val = simple_strtoul(buf, NULL, 10);
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ssize_t ret;
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mutex_lock(&smi_data_lock);
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if (smi_data_buf_size < sizeof(struct smi_cmd)) {
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ret = -ENODEV;
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goto out;
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}
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smi_cmd = (struct smi_cmd *)smi_data_buf;
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switch (val) {
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case 2:
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/* Raw SMI */
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ret = smi_request(smi_cmd);
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if (!ret)
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ret = count;
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break;
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case 1:
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/* Calling Interface SMI */
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smi_cmd->ebx = (u32) virt_to_phys(smi_cmd->command_buffer);
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ret = smi_request(smi_cmd);
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if (!ret)
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ret = count;
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break;
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case 0:
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memset(smi_data_buf, 0, smi_data_buf_size);
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ret = count;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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out:
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mutex_unlock(&smi_data_lock);
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return ret;
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}
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/**
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* host_control_smi: generate host control SMI
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*
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* Caller must set up the host control command in smi_data_buf.
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*/
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static int host_control_smi(void)
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{
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struct apm_cmd *apm_cmd;
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u8 *data;
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unsigned long flags;
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u32 num_ticks;
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s8 cmd_status;
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u8 index;
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apm_cmd = (struct apm_cmd *)smi_data_buf;
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apm_cmd->status = ESM_STATUS_CMD_UNSUCCESSFUL;
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switch (host_control_smi_type) {
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case HC_SMITYPE_TYPE1:
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spin_lock_irqsave(&rtc_lock, flags);
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/* write SMI data buffer physical address */
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data = (u8 *)&smi_data_buf_phys_addr;
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for (index = PE1300_CMOS_CMD_STRUCT_PTR;
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index < (PE1300_CMOS_CMD_STRUCT_PTR + 4);
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index++, data++) {
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outb(index,
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(CMOS_BASE_PORT + CMOS_PAGE2_INDEX_PORT_PIIX4));
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outb(*data,
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(CMOS_BASE_PORT + CMOS_PAGE2_DATA_PORT_PIIX4));
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}
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/* first set status to -1 as called by spec */
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cmd_status = ESM_STATUS_CMD_UNSUCCESSFUL;
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outb((u8) cmd_status, PCAT_APM_STATUS_PORT);
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/* generate SMM call */
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outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
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spin_unlock_irqrestore(&rtc_lock, flags);
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/* wait a few to see if it executed */
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num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
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while ((cmd_status = inb(PCAT_APM_STATUS_PORT))
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== ESM_STATUS_CMD_UNSUCCESSFUL) {
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num_ticks--;
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if (num_ticks == EXPIRED_TIMER)
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return -ETIME;
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}
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break;
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case HC_SMITYPE_TYPE2:
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case HC_SMITYPE_TYPE3:
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spin_lock_irqsave(&rtc_lock, flags);
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/* write SMI data buffer physical address */
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data = (u8 *)&smi_data_buf_phys_addr;
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for (index = PE1400_CMOS_CMD_STRUCT_PTR;
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index < (PE1400_CMOS_CMD_STRUCT_PTR + 4);
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index++, data++) {
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outb(index, (CMOS_BASE_PORT + CMOS_PAGE1_INDEX_PORT));
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outb(*data, (CMOS_BASE_PORT + CMOS_PAGE1_DATA_PORT));
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}
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/* generate SMM call */
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if (host_control_smi_type == HC_SMITYPE_TYPE3)
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outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
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else
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outb(ESM_APM_CMD, PE1400_APM_CONTROL_PORT);
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/* restore RTC index pointer since it was written to above */
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CMOS_READ(RTC_REG_C);
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spin_unlock_irqrestore(&rtc_lock, flags);
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/* read control port back to serialize write */
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cmd_status = inb(PE1400_APM_CONTROL_PORT);
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/* wait a few to see if it executed */
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num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
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while (apm_cmd->status == ESM_STATUS_CMD_UNSUCCESSFUL) {
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num_ticks--;
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if (num_ticks == EXPIRED_TIMER)
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return -ETIME;
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}
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break;
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default:
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dev_dbg(&dcdbas_pdev->dev, "%s: invalid SMI type %u\n",
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__FUNCTION__, host_control_smi_type);
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return -ENOSYS;
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}
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return 0;
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}
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/**
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* dcdbas_host_control: initiate host control
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*
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* This function is called by the driver after the system has
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* finished shutting down if the user application specified a
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* host control action to perform on shutdown. It is safe to
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* use smi_data_buf at this point because the system has finished
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* shutting down and no userspace apps are running.
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*/
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static void dcdbas_host_control(void)
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{
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struct apm_cmd *apm_cmd;
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u8 action;
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if (host_control_action == HC_ACTION_NONE)
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return;
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action = host_control_action;
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host_control_action = HC_ACTION_NONE;
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if (!smi_data_buf) {
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dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __FUNCTION__);
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return;
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}
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if (smi_data_buf_size < sizeof(struct apm_cmd)) {
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dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n",
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__FUNCTION__);
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return;
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}
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apm_cmd = (struct apm_cmd *)smi_data_buf;
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/* power off takes precedence */
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if (action & HC_ACTION_HOST_CONTROL_POWEROFF) {
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apm_cmd->command = ESM_APM_POWER_CYCLE;
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apm_cmd->reserved = 0;
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*((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 0;
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host_control_smi();
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} else if (action & HC_ACTION_HOST_CONTROL_POWERCYCLE) {
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apm_cmd->command = ESM_APM_POWER_CYCLE;
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apm_cmd->reserved = 0;
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*((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 20;
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host_control_smi();
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}
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}
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/**
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* dcdbas_reboot_notify: handle reboot notification for host control
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*/
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static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code,
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void *unused)
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{
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switch (code) {
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case SYS_DOWN:
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case SYS_HALT:
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case SYS_POWER_OFF:
|
|
if (host_control_on_shutdown) {
|
|
/* firmware is going to perform host control action */
|
|
printk(KERN_WARNING "Please wait for shutdown "
|
|
"action to complete...\n");
|
|
dcdbas_host_control();
|
|
}
|
|
break;
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block dcdbas_reboot_nb = {
|
|
.notifier_call = dcdbas_reboot_notify,
|
|
.next = NULL,
|
|
.priority = INT_MIN
|
|
};
|
|
|
|
static DCDBAS_BIN_ATTR_RW(smi_data);
|
|
|
|
static struct bin_attribute *dcdbas_bin_attrs[] = {
|
|
&bin_attr_smi_data,
|
|
NULL
|
|
};
|
|
|
|
static DCDBAS_DEV_ATTR_RW(smi_data_buf_size);
|
|
static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr);
|
|
static DCDBAS_DEV_ATTR_WO(smi_request);
|
|
static DCDBAS_DEV_ATTR_RW(host_control_action);
|
|
static DCDBAS_DEV_ATTR_RW(host_control_smi_type);
|
|
static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown);
|
|
|
|
static struct attribute *dcdbas_dev_attrs[] = {
|
|
&dev_attr_smi_data_buf_size.attr,
|
|
&dev_attr_smi_data_buf_phys_addr.attr,
|
|
&dev_attr_smi_request.attr,
|
|
&dev_attr_host_control_action.attr,
|
|
&dev_attr_host_control_smi_type.attr,
|
|
&dev_attr_host_control_on_shutdown.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group dcdbas_attr_group = {
|
|
.attrs = dcdbas_dev_attrs,
|
|
};
|
|
|
|
static int __devinit dcdbas_probe(struct platform_device *dev)
|
|
{
|
|
int i, error;
|
|
|
|
host_control_action = HC_ACTION_NONE;
|
|
host_control_smi_type = HC_SMITYPE_NONE;
|
|
|
|
/*
|
|
* BIOS SMI calls require buffer addresses be in 32-bit address space.
|
|
* This is done by setting the DMA mask below.
|
|
*/
|
|
dcdbas_pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
|
|
dcdbas_pdev->dev.dma_mask = &dcdbas_pdev->dev.coherent_dma_mask;
|
|
|
|
error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);
|
|
if (error)
|
|
return error;
|
|
|
|
for (i = 0; dcdbas_bin_attrs[i]; i++) {
|
|
error = sysfs_create_bin_file(&dev->dev.kobj,
|
|
dcdbas_bin_attrs[i]);
|
|
if (error) {
|
|
while (--i >= 0)
|
|
sysfs_remove_bin_file(&dev->dev.kobj,
|
|
dcdbas_bin_attrs[i]);
|
|
sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
|
|
return error;
|
|
}
|
|
}
|
|
|
|
register_reboot_notifier(&dcdbas_reboot_nb);
|
|
|
|
dev_info(&dev->dev, "%s (version %s)\n",
|
|
DRIVER_DESCRIPTION, DRIVER_VERSION);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __devexit dcdbas_remove(struct platform_device *dev)
|
|
{
|
|
int i;
|
|
|
|
unregister_reboot_notifier(&dcdbas_reboot_nb);
|
|
for (i = 0; dcdbas_bin_attrs[i]; i++)
|
|
sysfs_remove_bin_file(&dev->dev.kobj, dcdbas_bin_attrs[i]);
|
|
sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver dcdbas_driver = {
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = dcdbas_probe,
|
|
.remove = __devexit_p(dcdbas_remove),
|
|
};
|
|
|
|
/**
|
|
* dcdbas_init: initialize driver
|
|
*/
|
|
static int __init dcdbas_init(void)
|
|
{
|
|
int error;
|
|
|
|
error = platform_driver_register(&dcdbas_driver);
|
|
if (error)
|
|
return error;
|
|
|
|
dcdbas_pdev = platform_device_alloc(DRIVER_NAME, -1);
|
|
if (!dcdbas_pdev) {
|
|
error = -ENOMEM;
|
|
goto err_unregister_driver;
|
|
}
|
|
|
|
error = platform_device_add(dcdbas_pdev);
|
|
if (error)
|
|
goto err_free_device;
|
|
|
|
return 0;
|
|
|
|
err_free_device:
|
|
platform_device_put(dcdbas_pdev);
|
|
err_unregister_driver:
|
|
platform_driver_unregister(&dcdbas_driver);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* dcdbas_exit: perform driver cleanup
|
|
*/
|
|
static void __exit dcdbas_exit(void)
|
|
{
|
|
/*
|
|
* make sure functions that use dcdbas_pdev are called
|
|
* before platform_device_unregister
|
|
*/
|
|
unregister_reboot_notifier(&dcdbas_reboot_nb);
|
|
smi_data_buf_free();
|
|
platform_device_unregister(dcdbas_pdev);
|
|
platform_driver_unregister(&dcdbas_driver);
|
|
|
|
/*
|
|
* We have to free the buffer here instead of dcdbas_remove
|
|
* because only in module exit function we can be sure that
|
|
* all sysfs attributes belonging to this module have been
|
|
* released.
|
|
*/
|
|
smi_data_buf_free();
|
|
}
|
|
|
|
module_init(dcdbas_init);
|
|
module_exit(dcdbas_exit);
|
|
|
|
MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")");
|
|
MODULE_VERSION(DRIVER_VERSION);
|
|
MODULE_AUTHOR("Dell Inc.");
|
|
MODULE_LICENSE("GPL");
|
|
|