// SPDX-License-Identifier: GPL-2.0-only/* * dmi-sysfs.c * * This module exports the DMI tables read-only to userspace through the * sysfs file system. * * Data is currently found below * /sys/firmware/dmi/... * * DMI attributes are presented in attribute files with names * formatted using %d-%d, so that the first integer indicates the * structure type (0-255), and the second field is the instance of that * entry. * * Copyright 2011 Google, Inc. */ #include <linux/kernel.h>#include <linux/init.h>#include <linux/module.h>#include <linux/types.h>#include <linux/kobject.h>#include <linux/dmi.h>#include <linux/capability.h>#include <linux/slab.h>#include <linux/list.h>#include <linux/io.h>#include <asm/dmi.h> #define MAX_ENTRY_TYPE 255 /* Most of these aren't used, but we consider the top entry type is only 8 bits */ struct dmi_sysfs_entry { struct dmi_header dh; struct kobject kobj; int instance; int position; struct list_head list; struct kobject *child;}; /* * Global list of dmi_sysfs_entry. Even though this should only be * manipulated at setup and teardown, the lazy nature of the kobject * system means we get lazy removes. */static LIST_HEAD(entry_list);static DEFINE_SPINLOCK(entry_list_lock); /* dmi_sysfs_attribute - Top level attribute. used by all entries. */struct dmi_sysfs_attribute { struct attribute attr; ssize_t (*show)(struct dmi_sysfs_entry *entry, char *buf);}; #define DMI_SYSFS_ATTR(_entry, _name) \struct dmi_sysfs_attribute dmi_sysfs_attr_##_entry##_##_name = { \ .attr = {.name = __stringify(_name), .mode = 0400}, \ .show = dmi_sysfs_##_entry##_##_name, \} /* * dmi_sysfs_mapped_attribute - Attribute where we require the entry be * mapped in. Use in conjunction with dmi_sysfs_specialize_attr_ops. */struct dmi_sysfs_mapped_attribute { struct attribute attr; ssize_t (*show)(struct dmi_sysfs_entry *entry, const struct dmi_header *dh, char *buf);}; #define DMI_SYSFS_MAPPED_ATTR(_entry, _name) \struct dmi_sysfs_mapped_attribute dmi_sysfs_attr_##_entry##_##_name = { \ .attr = {.name = __stringify(_name), .mode = 0400}, \ .show = dmi_sysfs_##_entry##_##_name, \} /************************************************* * Generic DMI entry support. *************************************************/static void dmi_entry_free(struct kobject *kobj){ kfree(kobj);} static struct dmi_sysfs_entry *to_entry(struct kobject *kobj){ return container_of(kobj, struct dmi_sysfs_entry, kobj);} static struct dmi_sysfs_attribute *to_attr(struct attribute *attr){ return container_of(attr, struct dmi_sysfs_attribute, attr);} static ssize_t dmi_sysfs_attr_show(struct kobject *kobj, struct attribute *_attr, char *buf){ struct dmi_sysfs_entry *entry = to_entry(kobj); struct dmi_sysfs_attribute *attr = to_attr(_attr); /* DMI stuff is only ever admin visible */ if (!capable(CAP_SYS_ADMIN)) return -EACCES; return attr->show(entry, buf);} static const struct sysfs_ops dmi_sysfs_attr_ops = { .show = dmi_sysfs_attr_show,}; typedef ssize_t (*dmi_callback)(struct dmi_sysfs_entry *, const struct dmi_header *dh, void *); struct find_dmi_data { struct dmi_sysfs_entry *entry; dmi_callback callback; void *private; int instance_countdown; ssize_t ret;}; static void find_dmi_entry_helper(const struct dmi_header *dh, void *_data){ struct find_dmi_data *data = _data; struct dmi_sysfs_entry *entry = data->entry; /* Is this the entry we want? */ if (dh->type != entry->dh.type) return; if (data->instance_countdown != 0) { /* try the next instance? */ data->instance_countdown--; return; } /* * Don't ever revisit the instance. Short circuit later * instances by letting the instance_countdown run negative */ data->instance_countdown--; /* Found the entry */ data->ret = data->callback(entry, dh, data->private);} /* State for passing the read parameters through dmi_find_entry() */struct dmi_read_state { char *buf; loff_t pos; size_t count;}; static ssize_t find_dmi_entry(struct dmi_sysfs_entry *entry, dmi_callback callback, void *private){ struct find_dmi_data data = { .entry = entry, .callback = callback, .private = private, .instance_countdown = entry->instance, .ret = -EIO, /* To signal the entry disappeared */ }; int ret; ret = dmi_walk(find_dmi_entry_helper, &data); /* This shouldn't happen, but just in case. */ if (ret) return -EINVAL; return data.ret;} /* * Calculate and return the byte length of the dmi entry identified by * dh. This includes both the formatted portion as well as the * unformatted string space, including the two trailing nul characters. */static size_t dmi_entry_length(const struct dmi_header *dh){ const char *p = (const char *)dh; p += dh->length; while (p[0] || p[1]) p++; return 2 + p - (const char *)dh;} /************************************************* * Support bits for specialized DMI entry support *************************************************/struct dmi_entry_attr_show_data { struct attribute *attr; char *buf;}; static ssize_t dmi_entry_attr_show_helper(struct dmi_sysfs_entry *entry, const struct dmi_header *dh, void *_data){ struct dmi_entry_attr_show_data *data = _data; struct dmi_sysfs_mapped_attribute *attr; attr = container_of(data->attr, struct dmi_sysfs_mapped_attribute, attr); return attr->show(entry, dh, data->buf);} static ssize_t dmi_entry_attr_show(struct kobject *kobj, struct attribute *attr, char *buf){ struct dmi_entry_attr_show_data data = { .attr = attr, .buf = buf, }; /* Find the entry according to our parent and call the * normalized show method hanging off of the attribute */ return find_dmi_entry(to_entry(kobj->parent), dmi_entry_attr_show_helper, &data);} static const struct sysfs_ops dmi_sysfs_specialize_attr_ops = { .show = dmi_entry_attr_show,}; /************************************************* * Specialized DMI entry support. *************************************************/ /*** Type 15 - System Event Table ***/ #define DMI_SEL_ACCESS_METHOD_IO8 0x00#define DMI_SEL_ACCESS_METHOD_IO2x8 0x01#define DMI_SEL_ACCESS_METHOD_IO16 0x02#define DMI_SEL_ACCESS_METHOD_PHYS32 0x03#define DMI_SEL_ACCESS_METHOD_GPNV 0x04 struct dmi_system_event_log { struct dmi_header header; u16 area_length; u16 header_start_offset; u16 data_start_offset; u8 access_method; u8 status; u32 change_token; union { struct { u16 index_addr; u16 data_addr; } io; u32 phys_addr32; u16 gpnv_handle; u32 access_method_address; }; u8 header_format; u8 type_descriptors_supported_count; u8 per_log_type_descriptor_length; u8 supported_log_type_descriptos[];} __packed; #define DMI_SYSFS_SEL_FIELD(_field) \static ssize_t dmi_sysfs_sel_##_field(struct dmi_sysfs_entry *entry, \ const struct dmi_header *dh, \ char *buf) \{ \ struct dmi_system_event_log sel; \ if (sizeof(sel) > dmi_entry_length(dh)) \ return -EIO; \ memcpy(&sel, dh, sizeof(sel)); \ return sprintf(buf, "%u\n", sel._field); \} \static DMI_SYSFS_MAPPED_ATTR(sel, _field) DMI_SYSFS_SEL_FIELD(area_length);DMI_SYSFS_SEL_FIELD(header_start_offset);DMI_SYSFS_SEL_FIELD(data_start_offset);DMI_SYSFS_SEL_FIELD(access_method);DMI_SYSFS_SEL_FIELD(status);DMI_SYSFS_SEL_FIELD(change_token);DMI_SYSFS_SEL_FIELD(access_method_address);DMI_SYSFS_SEL_FIELD(header_format);DMI_SYSFS_SEL_FIELD(type_descriptors_supported_count);DMI_SYSFS_SEL_FIELD(per_log_type_descriptor_length); static struct attribute *dmi_sysfs_sel_attrs[] = { &dmi_sysfs_attr_sel_area_length.attr, &dmi_sysfs_attr_sel_header_start_offset.attr, &dmi_sysfs_attr_sel_data_start_offset.attr, &dmi_sysfs_attr_sel_access_method.attr, &dmi_sysfs_attr_sel_status.attr, &dmi_sysfs_attr_sel_change_token.attr, &dmi_sysfs_attr_sel_access_method_address.attr, &dmi_sysfs_attr_sel_header_format.attr, &dmi_sysfs_attr_sel_type_descriptors_supported_count.attr, &dmi_sysfs_attr_sel_per_log_type_descriptor_length.attr, NULL,};ATTRIBUTE_GROUPS(dmi_sysfs_sel); static const struct kobj_type dmi_system_event_log_ktype = { .release = dmi_entry_free, .sysfs_ops = &dmi_sysfs_specialize_attr_ops, .default_groups = dmi_sysfs_sel_groups,}; #ifdef CONFIG_HAS_IOPORTtypedef u8 (*sel_io_reader)(const struct dmi_system_event_log *sel, loff_t offset); static DEFINE_MUTEX(io_port_lock); static u8 read_sel_8bit_indexed_io(const struct dmi_system_event_log *sel, loff_t offset){ u8 ret; mutex_lock(&io_port_lock); outb((u8)offset, sel->io.index_addr); ret = inb(sel->io.data_addr); mutex_unlock(&io_port_lock); return ret;} static u8 read_sel_2x8bit_indexed_io(const struct dmi_system_event_log *sel, loff_t offset){ u8 ret; mutex_lock(&io_port_lock); outb((u8)offset, sel->io.index_addr); outb((u8)(offset >> 8), sel->io.index_addr + 1); ret = inb(sel->io.data_addr); mutex_unlock(&io_port_lock); return ret;} static u8 read_sel_16bit_indexed_io(const struct dmi_system_event_log *sel, loff_t offset){ u8 ret; mutex_lock(&io_port_lock); outw((u16)offset, sel->io.index_addr); ret = inb(sel->io.data_addr); mutex_unlock(&io_port_lock); return ret;} static sel_io_reader sel_io_readers[] = { [DMI_SEL_ACCESS_METHOD_IO8] = read_sel_8bit_indexed_io, [DMI_SEL_ACCESS_METHOD_IO2x8] = read_sel_2x8bit_indexed_io, [DMI_SEL_ACCESS_METHOD_IO16] = read_sel_16bit_indexed_io,}; static ssize_t dmi_sel_raw_read_io(struct dmi_sysfs_entry *entry, const struct dmi_system_event_log *sel, char *buf, loff_t pos, size_t count){ ssize_t wrote = 0; sel_io_reader io_reader = sel_io_readers[sel->access_method]; while (count && pos < sel->area_length) { count--; *(buf++) = io_reader(sel, pos++); wrote++; } return wrote;}#endif static ssize_t dmi_sel_raw_read_phys32(struct dmi_sysfs_entry *entry, const struct dmi_system_event_log *sel, char *buf, loff_t pos, size_t count){ u8 __iomem *mapped; ssize_t wrote = 0; mapped = dmi_remap(sel->access_method_address, sel->area_length); if (!mapped) return -EIO; while (count && pos < sel->area_length) { count--; *(buf++) = readb(mapped + pos++); wrote++; } dmi_unmap(mapped); return wrote;} static ssize_t dmi_sel_raw_read_helper(struct dmi_sysfs_entry *entry, const struct dmi_header *dh, void *_state){ struct dmi_read_state *state = _state; struct dmi_system_event_log sel; if (sizeof(sel) > dmi_entry_length(dh)) return -EIO; memcpy(&sel, dh, sizeof(sel)); switch (sel.access_method) {#ifdef CONFIG_HAS_IOPORT case DMI_SEL_ACCESS_METHOD_IO8: case DMI_SEL_ACCESS_METHOD_IO2x8: case DMI_SEL_ACCESS_METHOD_IO16: return dmi_sel_raw_read_io(entry, &sel, state->buf, state->pos, state->count);#endif case DMI_SEL_ACCESS_METHOD_PHYS32: return dmi_sel_raw_read_phys32(entry, &sel, state->buf, state->pos, state->count); case DMI_SEL_ACCESS_METHOD_GPNV: pr_info_ratelimited("dmi-sysfs: GPNV support missing.\n"); return -EIO; default: pr_info_ratelimited("dmi-sysfs: Unknown access method %02x\n", sel.access_method); return -EIO; }} static ssize_t raw_event_log_read(struct file *filp, struct kobject *kobj, const struct bin_attribute *bin_attr, char *buf, loff_t pos, size_t count){ struct dmi_sysfs_entry *entry = to_entry(kobj->parent); struct dmi_read_state state = { .buf = buf, .pos = pos, .count = count, }; return find_dmi_entry(entry, dmi_sel_raw_read_helper, &state);} static const BIN_ATTR_ADMIN_RO(raw_event_log, 0); static int dmi_system_event_log(struct dmi_sysfs_entry *entry){ int ret; entry->child = kzalloc_obj(*entry->child); if (!entry->child) return -ENOMEM; ret = kobject_init_and_add(entry->child, &dmi_system_event_log_ktype, &entry->kobj, "system_event_log"); if (ret) goto out_free; ret = sysfs_create_bin_file(entry->child, &bin_attr_raw_event_log); if (ret) goto out_del; return 0; out_del: kobject_del(entry->child);out_free: kfree(entry->child); return ret;} /************************************************* * Generic DMI entry support. *************************************************/ static ssize_t dmi_sysfs_entry_length(struct dmi_sysfs_entry *entry, char *buf){ return sprintf(buf, "%d\n", entry->dh.length);} static ssize_t dmi_sysfs_entry_handle(struct dmi_sysfs_entry *entry, char *buf){ return sprintf(buf, "%d\n", entry->dh.handle);} static ssize_t dmi_sysfs_entry_type(struct dmi_sysfs_entry *entry, char *buf){ return sprintf(buf, "%d\n", entry->dh.type);} static ssize_t dmi_sysfs_entry_instance(struct dmi_sysfs_entry *entry, char *buf){ return sprintf(buf, "%d\n", entry->instance);}Lines 1–500 of 697. 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// SPDX-License-Identifier: GPL-2.0-only /* * dmi-sysfs.c * * This module exports the DMI tables read-only to userspace through the * sysfs file system. * * Data is currently found below * /sys/firmware/dmi/... * * DMI attributes are presented in attribute files with names * formatted using %d-%d, so that the first integer indicates the * structure type (0-255), and the second field is the instance of that * entry. * * Copyright 2011 Google, Inc. */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/module.h> #include <linux/types.h> #include <linux/kobject.h> #include <linux/dmi.h> #include <linux/capability.h> #include <linux/slab.h> #include <linux/list.h> #include <linux/io.h> #include <asm/dmi.h> #define MAX_ENTRY_TYPE 255 /* Most of these aren't used, but we consider the top entry type is only 8 bits */ struct dmi_sysfs_entry { struct dmi_header dh; struct kobject kobj; int instance; int position; struct list_head list; struct kobject *child; }; /* * Global list of dmi_sysfs_entry. Even though this should only be * manipulated at setup and teardown, the lazy nature of the kobject * system means we get lazy removes. */ static LIST_HEAD(entry_list); static DEFINE_SPINLOCK(entry_list_lock); /* dmi_sysfs_attribute - Top level attribute. used by all entries. */ struct dmi_sysfs_attribute { struct attribute attr; ssize_t (*show)(struct dmi_sysfs_entry *entry, char *buf); }; #define DMI_SYSFS_ATTR(_entry, _name) \ struct dmi_sysfs_attribute dmi_sysfs_attr_##_entry##_##_name = { \ .attr = {.name = __stringify(_name), .mode = 0400}, \ .show = dmi_sysfs_##_entry##_##_name, \ } /* * dmi_sysfs_mapped_attribute - Attribute where we require the entry be * mapped in. Use in conjunction with dmi_sysfs_specialize_attr_ops. */ struct dmi_sysfs_mapped_attribute { struct attribute attr; ssize_t (*show)(struct dmi_sysfs_entry *entry, const struct dmi_header *dh, char *buf); }; #define DMI_SYSFS_MAPPED_ATTR(_entry, _name) \ struct dmi_sysfs_mapped_attribute dmi_sysfs_attr_##_entry##_##_name = { \ .attr = {.name = __stringify(_name), .mode = 0400}, \ .show = dmi_sysfs_##_entry##_##_name, \ } /************************************************* * Generic DMI entry support. *************************************************/ static void dmi_entry_free(struct kobject *kobj) { kfree(kobj); } static struct dmi_sysfs_entry *to_entry(struct kobject *kobj) { return container_of(kobj, struct dmi_sysfs_entry, kobj); } static struct dmi_sysfs_attribute *to_attr(struct attribute *attr) { return container_of(attr, struct dmi_sysfs_attribute, attr); } static ssize_t dmi_sysfs_attr_show(struct kobject *kobj, struct attribute *_attr, char *buf) { struct dmi_sysfs_entry *entry = to_entry(kobj); struct dmi_sysfs_attribute *attr = to_attr(_attr); /* DMI stuff is only ever admin visible */ if (!capable(CAP_SYS_ADMIN)) return -EACCES; return attr->show(entry, buf); } static const struct sysfs_ops dmi_sysfs_attr_ops = { .show = dmi_sysfs_attr_show, }; typedef ssize_t (*dmi_callback)(struct dmi_sysfs_entry *, const struct dmi_header *dh, void *); struct find_dmi_data { struct dmi_sysfs_entry *entry; dmi_callback callback; void *private; int instance_countdown; ssize_t ret; }; static void find_dmi_entry_helper(const struct dmi_header *dh, void *_data) { struct find_dmi_data *data = _data; struct dmi_sysfs_entry *entry = data->entry; /* Is this the entry we want? */ if (dh->type != entry->dh.type) return; if (data->instance_countdown != 0) { /* try the next instance? */ data->instance_countdown--; return; } /* * Don't ever revisit the instance. Short circuit later * instances by letting the instance_countdown run negative */ data->instance_countdown--; /* Found the entry */ data->ret = data->callback(entry, dh, data->private); } /* State for passing the read parameters through dmi_find_entry() */ struct dmi_read_state { char *buf; loff_t pos; size_t count; }; static ssize_t find_dmi_entry(struct dmi_sysfs_entry *entry, dmi_callback callback, void *private) { struct find_dmi_data data = { .entry = entry, .callback = callback, .private = private, .instance_countdown = entry->instance, .ret = -EIO, /* To signal the entry disappeared */ }; int ret; ret = dmi_walk(find_dmi_entry_helper, &data); /* This shouldn't happen, but just in case. */ if (ret) return -EINVAL; return data.ret; } /* * Calculate and return the byte length of the dmi entry identified by * dh. This includes both the formatted portion as well as the * unformatted string space, including the two trailing nul characters. */ static size_t dmi_entry_length(const struct dmi_header *dh) { const char *p = (const char *)dh; p += dh->length; while (p[0] || p[1]) p++; return 2 + p - (const char *)dh; } /************************************************* * Support bits for specialized DMI entry support *************************************************/ struct dmi_entry_attr_show_data { struct attribute *attr; char *buf; }; static ssize_t dmi_entry_attr_show_helper(struct dmi_sysfs_entry *entry, const struct dmi_header *dh, void *_data) { struct dmi_entry_attr_show_data *data = _data; struct dmi_sysfs_mapped_attribute *attr; attr = container_of(data->attr, struct dmi_sysfs_mapped_attribute, attr); return attr->show(entry, dh, data->buf); } static ssize_t dmi_entry_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) { struct dmi_entry_attr_show_data data = { .attr = attr, .buf = buf, }; /* Find the entry according to our parent and call the * normalized show method hanging off of the attribute */ return find_dmi_entry(to_entry(kobj->parent), dmi_entry_attr_show_helper, &data); } static const struct sysfs_ops dmi_sysfs_specialize_attr_ops = { .show = dmi_entry_attr_show, }; /************************************************* * Specialized DMI entry support. *************************************************/ /*** Type 15 - System Event Table ***/ #define DMI_SEL_ACCESS_METHOD_IO8 0x00 #define DMI_SEL_ACCESS_METHOD_IO2x8 0x01 #define DMI_SEL_ACCESS_METHOD_IO16 0x02 #define DMI_SEL_ACCESS_METHOD_PHYS32 0x03 #define DMI_SEL_ACCESS_METHOD_GPNV 0x04 struct dmi_system_event_log { struct dmi_header header; u16 area_length; u16 header_start_offset; u16 data_start_offset; u8 access_method; u8 status; u32 change_token; union { struct { u16 index_addr; u16 data_addr; } io; u32 phys_addr32; u16 gpnv_handle; u32 access_method_address; }; u8 header_format; u8 type_descriptors_supported_count; u8 per_log_type_descriptor_length; u8 supported_log_type_descriptos[]; } __packed; #define DMI_SYSFS_SEL_FIELD(_field) \ static ssize_t dmi_sysfs_sel_##_field(struct dmi_sysfs_entry *entry, \ const struct dmi_header *dh, \ char *buf) \ { \ struct dmi_system_event_log sel; \ if (sizeof(sel) > dmi_entry_length(dh)) \ return -EIO; \ memcpy(&sel, dh, sizeof(sel)); \ return sprintf(buf, "%u\n", sel._field); \ } \ static DMI_SYSFS_MAPPED_ATTR(sel, _field) DMI_SYSFS_SEL_FIELD(area_length); DMI_SYSFS_SEL_FIELD(header_start_offset); DMI_SYSFS_SEL_FIELD(data_start_offset); DMI_SYSFS_SEL_FIELD(access_method); DMI_SYSFS_SEL_FIELD(status); DMI_SYSFS_SEL_FIELD(change_token); DMI_SYSFS_SEL_FIELD(access_method_address); DMI_SYSFS_SEL_FIELD(header_format); DMI_SYSFS_SEL_FIELD(type_descriptors_supported_count); DMI_SYSFS_SEL_FIELD(per_log_type_descriptor_length); static struct attribute *dmi_sysfs_sel_attrs[] = { &dmi_sysfs_attr_sel_area_length.attr, &dmi_sysfs_attr_sel_header_start_offset.attr, &dmi_sysfs_attr_sel_data_start_offset.attr, &dmi_sysfs_attr_sel_access_method.attr, &dmi_sysfs_attr_sel_status.attr, &dmi_sysfs_attr_sel_change_token.attr, &dmi_sysfs_attr_sel_access_method_address.attr, &dmi_sysfs_attr_sel_header_format.attr, &dmi_sysfs_attr_sel_type_descriptors_supported_count.attr, &dmi_sysfs_attr_sel_per_log_type_descriptor_length.attr, NULL, }; ATTRIBUTE_GROUPS(dmi_sysfs_sel); static const struct kobj_type dmi_system_event_log_ktype = { .release = dmi_entry_free, .sysfs_ops = &dmi_sysfs_specialize_attr_ops, .default_groups = dmi_sysfs_sel_groups, }; #ifdef CONFIG_HAS_IOPORT typedef u8 (*sel_io_reader)(const struct dmi_system_event_log *sel, loff_t offset); static DEFINE_MUTEX(io_port_lock); static u8 read_sel_8bit_indexed_io(const struct dmi_system_event_log *sel, loff_t offset) { u8 ret; mutex_lock(&io_port_lock); outb((u8)offset, sel->io.index_addr); ret = inb(sel->io.data_addr); mutex_unlock(&io_port_lock); return ret; } static u8 read_sel_2x8bit_indexed_io(const struct dmi_system_event_log *sel, loff_t offset) { u8 ret; mutex_lock(&io_port_lock); outb((u8)offset, sel->io.index_addr); outb((u8)(offset >> 8), sel->io.index_addr + 1); ret = inb(sel->io.data_addr); mutex_unlock(&io_port_lock); return ret; } static u8 read_sel_16bit_indexed_io(const struct dmi_system_event_log *sel, loff_t offset) { u8 ret; mutex_lock(&io_port_lock); outw((u16)offset, sel->io.index_addr); ret = inb(sel->io.data_addr); mutex_unlock(&io_port_lock); return ret; } static sel_io_reader sel_io_readers[] = { [DMI_SEL_ACCESS_METHOD_IO8] = read_sel_8bit_indexed_io, [DMI_SEL_ACCESS_METHOD_IO2x8] = read_sel_2x8bit_indexed_io, [DMI_SEL_ACCESS_METHOD_IO16] = read_sel_16bit_indexed_io, }; static ssize_t dmi_sel_raw_read_io(struct dmi_sysfs_entry *entry, const struct dmi_system_event_log *sel, char *buf, loff_t pos, size_t count) { ssize_t wrote = 0; sel_io_reader io_reader = sel_io_readers[sel->access_method]; while (count && pos < sel->area_length) { count--; *(buf++) = io_reader(sel, pos++); wrote++; } return wrote; } #endif static ssize_t dmi_sel_raw_read_phys32(struct dmi_sysfs_entry *entry, const struct dmi_system_event_log *sel, char *buf, loff_t pos, size_t count) { u8 __iomem *mapped; ssize_t wrote = 0; mapped = dmi_remap(sel->access_method_address, sel->area_length); if (!mapped) return -EIO; while (count && pos < sel->area_length) { count--; *(buf++) = readb(mapped + pos++); wrote++; } dmi_unmap(mapped); return wrote; } static ssize_t dmi_sel_raw_read_helper(struct dmi_sysfs_entry *entry, const struct dmi_header *dh, void *_state) { struct dmi_read_state *state = _state; struct dmi_system_event_log sel; if (sizeof(sel) > dmi_entry_length(dh)) return -EIO; memcpy(&sel, dh, sizeof(sel)); switch (sel.access_method) { #ifdef CONFIG_HAS_IOPORT case DMI_SEL_ACCESS_METHOD_IO8: case DMI_SEL_ACCESS_METHOD_IO2x8: case DMI_SEL_ACCESS_METHOD_IO16: return dmi_sel_raw_read_io(entry, &sel, state->buf, state->pos, state->count); #endif case DMI_SEL_ACCESS_METHOD_PHYS32: return dmi_sel_raw_read_phys32(entry, &sel, state->buf, state->pos, state->count); case DMI_SEL_ACCESS_METHOD_GPNV: pr_info_ratelimited("dmi-sysfs: GPNV support missing.\n"); return -EIO; default: pr_info_ratelimited("dmi-sysfs: Unknown access method %02x\n", sel.access_method); return -EIO; } } static ssize_t raw_event_log_read(struct file *filp, struct kobject *kobj, const struct bin_attribute *bin_attr, char *buf, loff_t pos, size_t count) { struct dmi_sysfs_entry *entry = to_entry(kobj->parent); struct dmi_read_state state = { .buf = buf, .pos = pos, .count = count, }; return find_dmi_entry(entry, dmi_sel_raw_read_helper, &state); } static const BIN_ATTR_ADMIN_RO(raw_event_log, 0); static int dmi_system_event_log(struct dmi_sysfs_entry *entry) { int ret; entry->child = kzalloc_obj(*entry->child); if (!entry->child) return -ENOMEM; ret = kobject_init_and_add(entry->child, &dmi_system_event_log_ktype, &entry->kobj, "system_event_log"); if (ret) goto out_free; ret = sysfs_create_bin_file(entry->child, &bin_attr_raw_event_log); if (ret) goto out_del; return 0; out_del: kobject_del(entry->child); out_free: kfree(entry->child); return ret; } /************************************************* * Generic DMI entry support. *************************************************/ static ssize_t dmi_sysfs_entry_length(struct dmi_sysfs_entry *entry, char *buf) { return sprintf(buf, "%d\n", entry->dh.length); } static ssize_t dmi_sysfs_entry_handle(struct dmi_sysfs_entry *entry, char *buf) { return sprintf(buf, "%d\n", entry->dh.handle); } static ssize_t dmi_sysfs_entry_type(struct dmi_sysfs_entry *entry, char *buf) { return sprintf(buf, "%d\n", entry->dh.type); } static ssize_t dmi_sysfs_entry_instance(struct dmi_sysfs_entry *entry, char *buf) { return sprintf(buf, "%d\n", entry->instance); }