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770 lines
19 KiB
770 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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/driver-api/dcdbas.rst 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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|
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#include <linux/platform_device.h> |
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#include <linux/acpi.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/dmi.h> |
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#include <linux/errno.h> |
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#include <linux/cpu.h> |
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#include <linux/gfp.h> |
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#include <linux/init.h> |
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#include <linux/io.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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|
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#include "dcdbas.h" |
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#define DRIVER_NAME "dcdbas" |
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#define DRIVER_VERSION "5.6.0-3.4" |
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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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|
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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 unsigned long max_smi_data_buf_size = MAX_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 u8 *bios_buffer; |
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|
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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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static bool wsmt_enabled; |
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|
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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 || wsmt_enabled) |
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return; |
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dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n", |
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__func__, 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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__func__, 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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__func__, 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 file *filp, 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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mutex_lock(&smi_data_lock); |
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ret = memory_read_from_buffer(buf, count, &pos, smi_data_buf, |
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smi_data_buf_size); |
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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 file *filp, 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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static int raise_smi(void *par) |
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{ |
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struct smi_cmd *smi_cmd = par; |
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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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__func__); |
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return -EBUSY; |
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} |
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/* generate SMI */ |
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/* inb to force posted write through and make SMI happen now */ |
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asm volatile ( |
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"outb %b0,%w1\n" |
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"inb %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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return 0; |
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} |
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/** |
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* dcdbas_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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int dcdbas_smi_request(struct smi_cmd *smi_cmd) |
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{ |
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int ret; |
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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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__func__); |
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return -EBADR; |
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} |
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/* SMI requires CPU 0 */ |
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get_online_cpus(); |
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ret = smp_call_on_cpu(0, raise_smi, smi_cmd, true); |
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put_online_cpus(); |
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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 = dcdbas_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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/* |
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* Calling Interface SMI |
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* |
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* Provide physical address of command buffer field within |
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* the struct smi_cmd to BIOS. |
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* |
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* Because the address that smi_cmd (smi_data_buf) points to |
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* will be from memremap() of a non-memory address if WSMT |
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* is present, we can't use virt_to_phys() on smi_cmd, so |
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* we have to use the physical address that was saved when |
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* the virtual address for smi_cmd was received. |
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*/ |
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smi_cmd->ebx = smi_data_buf_phys_addr + |
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offsetof(struct smi_cmd, command_buffer); |
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ret = dcdbas_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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EXPORT_SYMBOL(dcdbas_smi_request); |
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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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__func__, 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", __func__); |
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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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__func__); |
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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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/* WSMT */ |
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static u8 checksum(u8 *buffer, u8 length) |
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{ |
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u8 sum = 0; |
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u8 *end = buffer + length; |
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|
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while (buffer < end) |
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sum += *buffer++; |
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return sum; |
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} |
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static inline struct smm_eps_table *check_eps_table(u8 *addr) |
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{ |
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struct smm_eps_table *eps = (struct smm_eps_table *)addr; |
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if (strncmp(eps->smm_comm_buff_anchor, SMM_EPS_SIG, 4) != 0) |
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return NULL; |
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if (checksum(addr, eps->length) != 0) |
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return NULL; |
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return eps; |
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} |
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static int dcdbas_check_wsmt(void) |
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{ |
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const struct dmi_device *dev = NULL; |
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struct acpi_table_wsmt *wsmt = NULL; |
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struct smm_eps_table *eps = NULL; |
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u64 bios_buf_paddr; |
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u64 remap_size; |
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u8 *addr; |
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acpi_get_table(ACPI_SIG_WSMT, 0, (struct acpi_table_header **)&wsmt); |
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if (!wsmt) |
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return 0; |
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|
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/* Check if WSMT ACPI table shows that protection is enabled */ |
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if (!(wsmt->protection_flags & ACPI_WSMT_FIXED_COMM_BUFFERS) || |
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!(wsmt->protection_flags & ACPI_WSMT_COMM_BUFFER_NESTED_PTR_PROTECTION)) |
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return 0; |
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|
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/* |
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* BIOS could provide the address/size of the protected buffer |
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* in an SMBIOS string or in an EPS structure in 0xFxxxx. |
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*/ |
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/* Check SMBIOS for buffer address */ |
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while ((dev = dmi_find_device(DMI_DEV_TYPE_OEM_STRING, NULL, dev))) |
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if (sscanf(dev->name, "30[%16llx;%8llx]", &bios_buf_paddr, |
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&remap_size) == 2) |
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goto remap; |
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/* Scan for EPS (entry point structure) */ |
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for (addr = (u8 *)__va(0xf0000); |
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addr < (u8 *)__va(0x100000 - sizeof(struct smm_eps_table)); |
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addr += 16) { |
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eps = check_eps_table(addr); |
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if (eps) |
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break; |
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} |
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|
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if (!eps) { |
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dev_dbg(&dcdbas_pdev->dev, "found WSMT, but no firmware buffer found\n"); |
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return -ENODEV; |
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} |
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bios_buf_paddr = eps->smm_comm_buff_addr; |
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remap_size = eps->num_of_4k_pages * PAGE_SIZE; |
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|
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remap: |
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/* |
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* Get physical address of buffer and map to virtual address. |
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* Table gives size in 4K pages, regardless of actual system page size. |
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*/ |
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if (upper_32_bits(bios_buf_paddr + 8)) { |
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dev_warn(&dcdbas_pdev->dev, "found WSMT, but buffer address is above 4GB\n"); |
|
return -EINVAL; |
|
} |
|
/* |
|
* Limit remap size to MAX_SMI_DATA_BUF_SIZE + 8 (since the first 8 |
|
* bytes are used for a semaphore, not the data buffer itself). |
|
*/ |
|
if (remap_size > MAX_SMI_DATA_BUF_SIZE + 8) |
|
remap_size = MAX_SMI_DATA_BUF_SIZE + 8; |
|
|
|
bios_buffer = memremap(bios_buf_paddr, remap_size, MEMREMAP_WB); |
|
if (!bios_buffer) { |
|
dev_warn(&dcdbas_pdev->dev, "found WSMT, but failed to map buffer\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
/* First 8 bytes is for a semaphore, not part of the smi_data_buf */ |
|
smi_data_buf_phys_addr = bios_buf_paddr + 8; |
|
smi_data_buf = bios_buffer + 8; |
|
smi_data_buf_size = remap_size - 8; |
|
max_smi_data_buf_size = smi_data_buf_size; |
|
wsmt_enabled = true; |
|
dev_info(&dcdbas_pdev->dev, |
|
"WSMT found, using firmware-provided SMI buffer.\n"); |
|
return 1; |
|
} |
|
|
|
/** |
|
* dcdbas_reboot_notify: handle reboot notification for host control |
|
*/ |
|
static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code, |
|
void *unused) |
|
{ |
|
switch (code) { |
|
case SYS_DOWN: |
|
case SYS_HALT: |
|
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 const struct attribute_group dcdbas_attr_group = { |
|
.attrs = dcdbas_dev_attrs, |
|
.bin_attrs = dcdbas_bin_attrs, |
|
}; |
|
|
|
static int dcdbas_probe(struct platform_device *dev) |
|
{ |
|
int error; |
|
|
|
host_control_action = HC_ACTION_NONE; |
|
host_control_smi_type = HC_SMITYPE_NONE; |
|
|
|
dcdbas_pdev = dev; |
|
|
|
/* Check if ACPI WSMT table specifies protected SMI buffer address */ |
|
error = dcdbas_check_wsmt(); |
|
if (error < 0) |
|
return error; |
|
|
|
/* |
|
* BIOS SMI calls require buffer addresses be in 32-bit address space. |
|
* This is done by setting the DMA mask below. |
|
*/ |
|
error = dma_set_coherent_mask(&dcdbas_pdev->dev, DMA_BIT_MASK(32)); |
|
if (error) |
|
return error; |
|
|
|
error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group); |
|
if (error) |
|
return error; |
|
|
|
register_reboot_notifier(&dcdbas_reboot_nb); |
|
|
|
dev_info(&dev->dev, "%s (version %s)\n", |
|
DRIVER_DESCRIPTION, DRIVER_VERSION); |
|
|
|
return 0; |
|
} |
|
|
|
static int dcdbas_remove(struct platform_device *dev) |
|
{ |
|
unregister_reboot_notifier(&dcdbas_reboot_nb); |
|
sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group); |
|
|
|
return 0; |
|
} |
|
|
|
static struct platform_driver dcdbas_driver = { |
|
.driver = { |
|
.name = DRIVER_NAME, |
|
}, |
|
.probe = dcdbas_probe, |
|
.remove = dcdbas_remove, |
|
}; |
|
|
|
static const struct platform_device_info dcdbas_dev_info __initconst = { |
|
.name = DRIVER_NAME, |
|
.id = -1, |
|
.dma_mask = DMA_BIT_MASK(32), |
|
}; |
|
|
|
static struct platform_device *dcdbas_pdev_reg; |
|
|
|
/** |
|
* dcdbas_init: initialize driver |
|
*/ |
|
static int __init dcdbas_init(void) |
|
{ |
|
int error; |
|
|
|
error = platform_driver_register(&dcdbas_driver); |
|
if (error) |
|
return error; |
|
|
|
dcdbas_pdev_reg = platform_device_register_full(&dcdbas_dev_info); |
|
if (IS_ERR(dcdbas_pdev_reg)) { |
|
error = PTR_ERR(dcdbas_pdev_reg); |
|
goto err_unregister_driver; |
|
} |
|
|
|
return 0; |
|
|
|
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); |
|
|
|
/* |
|
* 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. |
|
*/ |
|
if (dcdbas_pdev) |
|
smi_data_buf_free(); |
|
if (bios_buffer) |
|
memunmap(bios_buffer); |
|
platform_device_unregister(dcdbas_pdev_reg); |
|
platform_driver_unregister(&dcdbas_driver); |
|
} |
|
|
|
subsys_initcall_sync(dcdbas_init); |
|
module_exit(dcdbas_exit); |
|
|
|
MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")"); |
|
MODULE_VERSION(DRIVER_VERSION); |
|
MODULE_AUTHOR("Dell Inc."); |
|
MODULE_LICENSE("GPL"); |
|
/* Any System or BIOS claiming to be by Dell */ |
|
MODULE_ALIAS("dmi:*:[bs]vnD[Ee][Ll][Ll]*:*");
|
|
|