linux/drivers/acpi/sysfs.c

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/*
* sysfs.c - ACPI sysfs interface to userspace.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
ACPI: Clean up inclusions of ACPI header files Replace direct inclusions of <acpi/acpi.h>, <acpi/acpi_bus.h> and <acpi/acpi_drivers.h>, which are incorrect, with <linux/acpi.h> inclusions and remove some inclusions of those files that aren't necessary. First of all, <acpi/acpi.h>, <acpi/acpi_bus.h> and <acpi/acpi_drivers.h> should not be included directly from any files that are built for CONFIG_ACPI unset, because that generally leads to build warnings about undefined symbols in !CONFIG_ACPI builds. For CONFIG_ACPI set, <linux/acpi.h> includes those files and for CONFIG_ACPI unset it provides stub ACPI symbols to be used in that case. Second, there are ordering dependencies between those files that always have to be met. Namely, it is required that <acpi/acpi_bus.h> be included prior to <acpi/acpi_drivers.h> so that the acpi_pci_root declarations the latter depends on are always there. And <acpi/acpi.h> which provides basic ACPICA type declarations should always be included prior to any other ACPI headers in CONFIG_ACPI builds. That also is taken care of including <linux/acpi.h> as appropriate. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Tony Luck <tony.luck@intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> (drivers/pci stuff) Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> (Xen stuff) Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-12-03 00:49:16 +00:00
#include <linux/acpi.h>
#include "internal.h"
#define _COMPONENT ACPI_SYSTEM_COMPONENT
ACPI_MODULE_NAME("sysfs");
#ifdef CONFIG_ACPI_DEBUG
/*
* ACPI debug sysfs I/F, including:
* /sys/modules/acpi/parameters/debug_layer
* /sys/modules/acpi/parameters/debug_level
* /sys/modules/acpi/parameters/trace_method_name
* /sys/modules/acpi/parameters/trace_state
* /sys/modules/acpi/parameters/trace_debug_layer
* /sys/modules/acpi/parameters/trace_debug_level
*/
struct acpi_dlayer {
const char *name;
unsigned long value;
};
struct acpi_dlevel {
const char *name;
unsigned long value;
};
#define ACPI_DEBUG_INIT(v) { .name = #v, .value = v }
static const struct acpi_dlayer acpi_debug_layers[] = {
ACPI_DEBUG_INIT(ACPI_UTILITIES),
ACPI_DEBUG_INIT(ACPI_HARDWARE),
ACPI_DEBUG_INIT(ACPI_EVENTS),
ACPI_DEBUG_INIT(ACPI_TABLES),
ACPI_DEBUG_INIT(ACPI_NAMESPACE),
ACPI_DEBUG_INIT(ACPI_PARSER),
ACPI_DEBUG_INIT(ACPI_DISPATCHER),
ACPI_DEBUG_INIT(ACPI_EXECUTER),
ACPI_DEBUG_INIT(ACPI_RESOURCES),
ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
ACPI_DEBUG_INIT(ACPI_COMPILER),
ACPI_DEBUG_INIT(ACPI_TOOLS),
ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT),
ACPI_DEBUG_INIT(ACPI_AC_COMPONENT),
ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT),
ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT),
ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT),
ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT),
ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT),
ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT),
ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT),
ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT),
ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT),
ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT),
ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT),
ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT),
};
static const struct acpi_dlevel acpi_debug_levels[] = {
ACPI_DEBUG_INIT(ACPI_LV_INIT),
ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
ACPI_DEBUG_INIT(ACPI_LV_INFO),
ACPI_DEBUG_INIT(ACPI_LV_REPAIR),
ACPI_DEBUG_INIT(ACPI_LV_TRACE_POINT),
ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
ACPI_DEBUG_INIT(ACPI_LV_PARSE),
ACPI_DEBUG_INIT(ACPI_LV_LOAD),
ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
ACPI_DEBUG_INIT(ACPI_LV_EXEC),
ACPI_DEBUG_INIT(ACPI_LV_NAMES),
ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
ACPI_DEBUG_INIT(ACPI_LV_TABLES),
ACPI_DEBUG_INIT(ACPI_LV_VALUES),
ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
ACPI_DEBUG_INIT(ACPI_LV_THREADS),
ACPI_DEBUG_INIT(ACPI_LV_IO),
ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
};
static int param_get_debug_layer(char *buffer, const struct kernel_param *kp)
{
int result = 0;
int i;
result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
acpi_debug_layers[i].name,
acpi_debug_layers[i].value,
(acpi_dbg_layer & acpi_debug_layers[i].value)
? '*' : ' ');
}
result +=
sprintf(buffer + result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
ACPI_ALL_DRIVERS,
(acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS)
== 0 ? ' ' : '-');
result +=
sprintf(buffer + result,
"--\ndebug_layer = 0x%08X ( * = enabled)\n",
acpi_dbg_layer);
return result;
}
static int param_get_debug_level(char *buffer, const struct kernel_param *kp)
{
int result = 0;
int i;
result = sprintf(buffer, "%-25s\tHex SET\n", "Description");
for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
result += sprintf(buffer + result, "%-25s\t0x%08lX [%c]\n",
acpi_debug_levels[i].name,
acpi_debug_levels[i].value,
(acpi_dbg_level & acpi_debug_levels[i].value)
? '*' : ' ');
}
result +=
sprintf(buffer + result, "--\ndebug_level = 0x%08X (* = enabled)\n",
acpi_dbg_level);
return result;
}
static const struct kernel_param_ops param_ops_debug_layer = {
.set = param_set_uint,
.get = param_get_debug_layer,
};
static const struct kernel_param_ops param_ops_debug_level = {
.set = param_set_uint,
.get = param_get_debug_level,
};
module_param_cb(debug_layer, &param_ops_debug_layer, &acpi_dbg_layer, 0644);
module_param_cb(debug_level, &param_ops_debug_level, &acpi_dbg_level, 0644);
static char trace_method_name[1024];
int param_set_trace_method_name(const char *val, const struct kernel_param *kp)
{
u32 saved_flags = 0;
bool is_abs_path = true;
if (*val != '\\')
is_abs_path = false;
if ((is_abs_path && strlen(val) > 1023) ||
(!is_abs_path && strlen(val) > 1022)) {
pr_err("%s: string parameter too long\n", kp->name);
return -ENOSPC;
}
/*
* It's not safe to update acpi_gbl_trace_method_name without
* having the tracer stopped, so we save the original tracer
* state and disable it.
*/
saved_flags = acpi_gbl_trace_flags;
(void)acpi_debug_trace(NULL,
acpi_gbl_trace_dbg_level,
acpi_gbl_trace_dbg_layer,
0);
/* This is a hack. We can't kmalloc in early boot. */
if (is_abs_path)
strcpy(trace_method_name, val);
else {
trace_method_name[0] = '\\';
strcpy(trace_method_name+1, val);
}
/* Restore the original tracer state */
(void)acpi_debug_trace(trace_method_name,
acpi_gbl_trace_dbg_level,
acpi_gbl_trace_dbg_layer,
saved_flags);
return 0;
}
static int param_get_trace_method_name(char *buffer, const struct kernel_param *kp)
{
return scnprintf(buffer, PAGE_SIZE, "%s", acpi_gbl_trace_method_name);
}
static const struct kernel_param_ops param_ops_trace_method = {
.set = param_set_trace_method_name,
.get = param_get_trace_method_name,
};
static const struct kernel_param_ops param_ops_trace_attrib = {
.set = param_set_uint,
.get = param_get_uint,
};
module_param_cb(trace_method_name, &param_ops_trace_method, &trace_method_name, 0644);
module_param_cb(trace_debug_layer, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_layer, 0644);
module_param_cb(trace_debug_level, &param_ops_trace_attrib, &acpi_gbl_trace_dbg_level, 0644);
static int param_set_trace_state(const char *val, struct kernel_param *kp)
{
acpi_status status;
const char *method = trace_method_name;
u32 flags = 0;
/* So "xxx-once" comparison should go prior than "xxx" comparison */
#define acpi_compare_param(val, key) \
strncmp((val), (key), sizeof(key) - 1)
if (!acpi_compare_param(val, "enable")) {
method = NULL;
flags = ACPI_TRACE_ENABLED;
} else if (!acpi_compare_param(val, "disable"))
method = NULL;
else if (!acpi_compare_param(val, "method-once"))
flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT;
else if (!acpi_compare_param(val, "method"))
flags = ACPI_TRACE_ENABLED;
else if (!acpi_compare_param(val, "opcode-once"))
flags = ACPI_TRACE_ENABLED | ACPI_TRACE_ONESHOT | ACPI_TRACE_OPCODE;
else if (!acpi_compare_param(val, "opcode"))
flags = ACPI_TRACE_ENABLED | ACPI_TRACE_OPCODE;
else
return -EINVAL;
status = acpi_debug_trace(method,
acpi_gbl_trace_dbg_level,
acpi_gbl_trace_dbg_layer,
flags);
if (ACPI_FAILURE(status))
return -EBUSY;
return 0;
}
static int param_get_trace_state(char *buffer, struct kernel_param *kp)
{
if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED))
return sprintf(buffer, "disable");
else {
if (acpi_gbl_trace_method_name) {
if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT)
return sprintf(buffer, "method-once");
else
return sprintf(buffer, "method");
} else
return sprintf(buffer, "enable");
}
return 0;
}
module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
NULL, 0644);
#endif /* CONFIG_ACPI_DEBUG */
/* /sys/modules/acpi/parameters/aml_debug_output */
module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object,
byte, 0644);
MODULE_PARM_DESC(aml_debug_output,
"To enable/disable the ACPI Debug Object output.");
/* /sys/module/acpi/parameters/acpica_version */
static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
{
int result;
result = sprintf(buffer, "%x", ACPI_CA_VERSION);
return result;
}
module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
/*
* ACPI table sysfs I/F:
* /sys/firmware/acpi/tables/
* /sys/firmware/acpi/tables/dynamic/
*/
static LIST_HEAD(acpi_table_attr_list);
static struct kobject *tables_kobj;
static struct kobject *dynamic_tables_kobj;
static struct kobject *hotplug_kobj;
#define ACPI_MAX_TABLE_INSTANCES 999
#define ACPI_INST_SIZE 4 /* including trailing 0 */
struct acpi_table_attr {
struct bin_attribute attr;
char name[ACPI_NAME_SIZE];
int instance;
char filename[ACPI_NAME_SIZE+ACPI_INST_SIZE];
struct list_head node;
};
static ssize_t acpi_table_show(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr, char *buf,
loff_t offset, size_t count)
{
struct acpi_table_attr *table_attr =
container_of(bin_attr, struct acpi_table_attr, attr);
struct acpi_table_header *table_header = NULL;
acpi_status status;
ssize_t rc;
status = acpi_get_table(table_attr->name, table_attr->instance,
&table_header);
if (ACPI_FAILURE(status))
return -ENODEV;
rc = memory_read_from_buffer(buf, count, &offset, table_header,
table_header->length);
acpi_put_table(table_header);
return rc;
}
static int acpi_table_attr_init(struct kobject *tables_obj,
struct acpi_table_attr *table_attr,
struct acpi_table_header *table_header)
{
struct acpi_table_header *header = NULL;
struct acpi_table_attr *attr = NULL;
char instance_str[ACPI_INST_SIZE];
sysfs_attr_init(&table_attr->attr.attr);
ACPI_MOVE_NAME(table_attr->name, table_header->signature);
list_for_each_entry(attr, &acpi_table_attr_list, node) {
if (ACPI_COMPARE_NAME(table_attr->name, attr->name))
if (table_attr->instance < attr->instance)
table_attr->instance = attr->instance;
}
table_attr->instance++;
if (table_attr->instance > ACPI_MAX_TABLE_INSTANCES) {
pr_warn("%4.4s: too many table instances\n",
table_attr->name);
return -ERANGE;
}
ACPI_MOVE_NAME(table_attr->filename, table_header->signature);
table_attr->filename[ACPI_NAME_SIZE] = '\0';
if (table_attr->instance > 1 || (table_attr->instance == 1 &&
!acpi_get_table
(table_header->signature, 2, &header))) {
snprintf(instance_str, sizeof(instance_str), "%u",
table_attr->instance);
strcat(table_attr->filename, instance_str);
}
ACPI / sysfs: Set file size for each exposed ACPI table Currently, each of the ACPI tables exported from /sys/firmware/acpi/tables is of zero size: $ LANG=C ls -ld /sys/firmware/acpi/tables/* -r-------- 1 root root 0 Nov 19 09:48 /sys/firmware/acpi/tables/APIC -r-------- 1 root root 0 Nov 19 09:48 /sys/firmware/acpi/tables/BOOT -r-------- 1 root root 0 Nov 19 14:25 /sys/firmware/acpi/tables/DSDT -r-------- 1 root root 0 Nov 19 14:25 /sys/firmware/acpi/tables/FACP -r-------- 1 root root 0 Nov 19 14:25 /sys/firmware/acpi/tables/FACS -r-------- 1 root root 0 Nov 19 14:25 /sys/firmware/acpi/tables/MCFG -r-------- 1 root root 0 Nov 19 14:25 /sys/firmware/acpi/tables/SRAT drwxr-xr-x 2 root root 0 Nov 19 09:48 /sys/firmware/acpi/tables/dynamic/ due to which, user-land tools fail reading each table. For example: $ acpidump -f /sys/firmware/acpi/tables/SRAT Could not get input file size: /sys/firmware/acpi/tables/SRAT To deal with the issue, this patch assigns size of each ACPI table to the corresponding sysfs file. $ LANG=C ls -hld /sys/firmware/acpi/tables/* -r-------- 1 root root 94 Nov 19 16:45 /sys/firmware/acpi/tables/APIC -r-------- 1 root root 40 Nov 19 16:45 /sys/firmware/acpi/tables/BOOT -r-------- 1 root root 58K Nov 19 16:55 /sys/firmware/acpi/tables/DSDT -r-------- 1 root root 244 Nov 19 16:55 /sys/firmware/acpi/tables/FACP -r-------- 1 root root 64 Nov 19 16:55 /sys/firmware/acpi/tables/FACS -r-------- 1 root root 60 Nov 19 16:55 /sys/firmware/acpi/tables/MCFG -r-------- 1 root root 168 Nov 19 16:45 /sys/firmware/acpi/tables/SRAT drwxr-xr-x 2 root root 0 Nov 19 16:55 /sys/firmware/acpi/tables/dynamic/ Then, user-land tools work well like: $ acpidump -f /sys/firmware/acpi/tables/SRAT SRAT @ 0x0000000000000000 0000: 53 52 41 54 A8 00 00 00 02 65 56 4D 57 41 52 45 SRAT.....eVMWARE 0010: 4D 45 4D 50 4C 55 47 20 00 00 04 06 56 4D 57 20 MEMPLUG ....VMW 0020: 01 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 ................ 0030: 01 28 00 00 00 00 00 00 00 00 00 00 00 00 00 00 .(.............. 0040: 00 00 0A 00 00 00 00 00 00 00 00 00 01 00 00 00 ................ 0050: 00 00 00 00 00 00 00 00 01 28 00 00 00 00 00 00 .........(...... 0060: 00 00 10 00 00 00 00 00 00 00 F0 BF 00 00 00 00 ................ 0070: 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 ................ 0080: 01 28 00 00 00 00 00 00 00 00 00 00 01 00 00 00 .(.............. 0090: 00 00 00 40 00 00 00 00 00 00 00 00 01 00 00 00 ...@............ 00A0: 00 00 00 00 00 00 00 00 ........ Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com> Acked-by: Toshi Kani <toshi.kani@hp.com> Acked-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-11-19 08:54:47 +00:00
table_attr->attr.size = table_header->length;
table_attr->attr.read = acpi_table_show;
table_attr->attr.attr.name = table_attr->filename;
table_attr->attr.attr.mode = 0400;
return sysfs_create_bin_file(tables_obj, &table_attr->attr);
}
acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context)
{
struct acpi_table_attr *table_attr;
switch (event) {
ACPI / sysfs: Fix an issue for LoadTable opcode OEM tables can be installed via RSDT/XSDT, in this case, they have already been created under /sys/firmware/acpi/tables. For this kind of tables, normally LoadTable opcode will be executed to load them. If LoadTable opcode is executed after acpi_sysfs_init(), acpi_sysfs_table_handler() will be invoked, thus a redundant table file will be created under /sys/firmware/acpi/tables/dynamic. Then running "acpidump" on such platform results in an error, complaining blank empty table (see Link 1 below). The bug can be reproduced by customizing an OEM1 table, allowing it to be overridden via 'table_sigs' (drivers/acpi/tables.c), adding the following code to the customized DSDT to load it: Name (OEMH, Zero) Name (OEMF, One) If (LEqual (OEMF, One)) { Store (LoadTable ("OEM1", "Intel", "Test"), OEMH) Store (Zero, OEMF) } In order to make sure that the OEM1 table is installed after acpi_sysfs_init(), acpi_sysfs_init() can be moved before invoking acpi_load_tables(). Then the following command execution result can be seen: # acpidump > acpidump.txt Could not read table header: /sysfs/firmware/acpi/tables/dynamic/OEM12 Could not get ACPI table at index 17, AE_BAD_HEADER Link: https://bugzilla.kernel.org/show_bug.cgi?id=150841 # [1] Link: https://github.com/acpica/acpica/commit/ed6a5fbc Reported-by: Jason Voelz <jason.voelz@intel.com> Reported-by: Francisco Leoner <francisco.j.lenoer.soto@intel.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-09-13 09:48:27 +00:00
case ACPI_TABLE_EVENT_INSTALL:
table_attr =
kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
if (!table_attr)
return AE_NO_MEMORY;
if (acpi_table_attr_init(dynamic_tables_kobj,
table_attr, table)) {
kfree(table_attr);
return AE_ERROR;
}
list_add_tail(&table_attr->node, &acpi_table_attr_list);
break;
ACPI / sysfs: Fix an issue for LoadTable opcode OEM tables can be installed via RSDT/XSDT, in this case, they have already been created under /sys/firmware/acpi/tables. For this kind of tables, normally LoadTable opcode will be executed to load them. If LoadTable opcode is executed after acpi_sysfs_init(), acpi_sysfs_table_handler() will be invoked, thus a redundant table file will be created under /sys/firmware/acpi/tables/dynamic. Then running "acpidump" on such platform results in an error, complaining blank empty table (see Link 1 below). The bug can be reproduced by customizing an OEM1 table, allowing it to be overridden via 'table_sigs' (drivers/acpi/tables.c), adding the following code to the customized DSDT to load it: Name (OEMH, Zero) Name (OEMF, One) If (LEqual (OEMF, One)) { Store (LoadTable ("OEM1", "Intel", "Test"), OEMH) Store (Zero, OEMF) } In order to make sure that the OEM1 table is installed after acpi_sysfs_init(), acpi_sysfs_init() can be moved before invoking acpi_load_tables(). Then the following command execution result can be seen: # acpidump > acpidump.txt Could not read table header: /sysfs/firmware/acpi/tables/dynamic/OEM12 Could not get ACPI table at index 17, AE_BAD_HEADER Link: https://bugzilla.kernel.org/show_bug.cgi?id=150841 # [1] Link: https://github.com/acpica/acpica/commit/ed6a5fbc Reported-by: Jason Voelz <jason.voelz@intel.com> Reported-by: Francisco Leoner <francisco.j.lenoer.soto@intel.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-09-13 09:48:27 +00:00
case ACPI_TABLE_EVENT_LOAD:
case ACPI_TABLE_EVENT_UNLOAD:
ACPI / sysfs: Fix an issue for LoadTable opcode OEM tables can be installed via RSDT/XSDT, in this case, they have already been created under /sys/firmware/acpi/tables. For this kind of tables, normally LoadTable opcode will be executed to load them. If LoadTable opcode is executed after acpi_sysfs_init(), acpi_sysfs_table_handler() will be invoked, thus a redundant table file will be created under /sys/firmware/acpi/tables/dynamic. Then running "acpidump" on such platform results in an error, complaining blank empty table (see Link 1 below). The bug can be reproduced by customizing an OEM1 table, allowing it to be overridden via 'table_sigs' (drivers/acpi/tables.c), adding the following code to the customized DSDT to load it: Name (OEMH, Zero) Name (OEMF, One) If (LEqual (OEMF, One)) { Store (LoadTable ("OEM1", "Intel", "Test"), OEMH) Store (Zero, OEMF) } In order to make sure that the OEM1 table is installed after acpi_sysfs_init(), acpi_sysfs_init() can be moved before invoking acpi_load_tables(). Then the following command execution result can be seen: # acpidump > acpidump.txt Could not read table header: /sysfs/firmware/acpi/tables/dynamic/OEM12 Could not get ACPI table at index 17, AE_BAD_HEADER Link: https://bugzilla.kernel.org/show_bug.cgi?id=150841 # [1] Link: https://github.com/acpica/acpica/commit/ed6a5fbc Reported-by: Jason Voelz <jason.voelz@intel.com> Reported-by: Francisco Leoner <francisco.j.lenoer.soto@intel.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-09-13 09:48:27 +00:00
case ACPI_TABLE_EVENT_UNINSTALL:
/*
* we do not need to do anything right now
* because the table is not deleted from the
* global table list when unloading it.
*/
break;
default:
return AE_BAD_PARAMETER;
}
return AE_OK;
}
static int acpi_tables_sysfs_init(void)
{
struct acpi_table_attr *table_attr;
struct acpi_table_header *table_header = NULL;
int table_index;
acpi_status status;
int ret;
tables_kobj = kobject_create_and_add("tables", acpi_kobj);
if (!tables_kobj)
goto err;
dynamic_tables_kobj = kobject_create_and_add("dynamic", tables_kobj);
if (!dynamic_tables_kobj)
goto err_dynamic_tables;
for (table_index = 0;; table_index++) {
status = acpi_get_table_by_index(table_index, &table_header);
if (status == AE_BAD_PARAMETER)
break;
if (ACPI_FAILURE(status))
continue;
table_attr = kzalloc(sizeof(*table_attr), GFP_KERNEL);
if (!table_attr)
return -ENOMEM;
ret = acpi_table_attr_init(tables_kobj,
table_attr, table_header);
if (ret) {
kfree(table_attr);
return ret;
}
list_add_tail(&table_attr->node, &acpi_table_attr_list);
}
kobject_uevent(tables_kobj, KOBJ_ADD);
kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
return 0;
err_dynamic_tables:
kobject_put(tables_kobj);
err:
return -ENOMEM;
}
/*
* Detailed ACPI IRQ counters:
* /sys/firmware/acpi/interrupts/
*/
u32 acpi_irq_handled;
u32 acpi_irq_not_handled;
#define COUNT_GPE 0
#define COUNT_SCI 1 /* acpi_irq_handled */
#define COUNT_SCI_NOT 2 /* acpi_irq_not_handled */
#define COUNT_ERROR 3 /* other */
#define NUM_COUNTERS_EXTRA 4
struct event_counter {
u32 count;
u32 flags;
};
static struct event_counter *all_counters;
static u32 num_gpes;
static u32 num_counters;
static struct attribute **all_attrs;
static u32 acpi_gpe_count;
static struct attribute_group interrupt_stats_attr_group = {
.name = "interrupts",
};
static struct kobj_attribute *counter_attrs;
static void delete_gpe_attr_array(void)
{
struct event_counter *tmp = all_counters;
all_counters = NULL;
kfree(tmp);
if (counter_attrs) {
int i;
for (i = 0; i < num_gpes; i++)
kfree(counter_attrs[i].attr.name);
kfree(counter_attrs);
}
kfree(all_attrs);
return;
}
static void gpe_count(u32 gpe_number)
{
acpi_gpe_count++;
if (!all_counters)
return;
if (gpe_number < num_gpes)
all_counters[gpe_number].count++;
else
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
COUNT_ERROR].count++;
return;
}
static void fixed_event_count(u32 event_number)
{
if (!all_counters)
return;
if (event_number < ACPI_NUM_FIXED_EVENTS)
all_counters[num_gpes + event_number].count++;
else
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS +
COUNT_ERROR].count++;
return;
}
static void acpi_global_event_handler(u32 event_type, acpi_handle device,
u32 event_number, void *context)
{
if (event_type == ACPI_EVENT_TYPE_GPE)
gpe_count(event_number);
if (event_type == ACPI_EVENT_TYPE_FIXED)
fixed_event_count(event_number);
}
static int get_status(u32 index, acpi_event_status *status,
acpi_handle *handle)
{
int result;
if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
return -EINVAL;
if (index < num_gpes) {
result = acpi_get_gpe_device(index, handle);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
"Invalid GPE 0x%x", index));
return result;
}
result = acpi_get_gpe_status(*handle, index, status);
} else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
result = acpi_get_event_status(index - num_gpes, status);
return result;
}
static ssize_t counter_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
int index = attr - counter_attrs;
int size;
acpi_handle handle;
acpi_event_status status;
int result = 0;
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI].count =
acpi_irq_handled;
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT].count =
acpi_irq_not_handled;
all_counters[num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE].count =
acpi_gpe_count;
size = sprintf(buf, "%8u", all_counters[index].count);
/* "gpe_all" or "sci" */
if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
goto end;
result = get_status(index, &status, &handle);
if (result)
goto end;
if (status & ACPI_EVENT_FLAG_ENABLE_SET)
size += sprintf(buf + size, " EN");
else
size += sprintf(buf + size, " ");
if (status & ACPI_EVENT_FLAG_STATUS_SET)
size += sprintf(buf + size, " STS");
else
size += sprintf(buf + size, " ");
if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER))
size += sprintf(buf + size, " invalid ");
else if (status & ACPI_EVENT_FLAG_ENABLED)
size += sprintf(buf + size, " enabled ");
else if (status & ACPI_EVENT_FLAG_WAKE_ENABLED)
size += sprintf(buf + size, " wake_enabled");
else
size += sprintf(buf + size, " disabled ");
if (status & ACPI_EVENT_FLAG_MASKED)
size += sprintf(buf + size, " masked ");
else
size += sprintf(buf + size, " unmasked");
end:
size += sprintf(buf + size, "\n");
return result ? result : size;
}
/*
* counter_set() sets the specified counter.
* setting the total "sci" file to any value clears all counters.
* enable/disable/clear a gpe/fixed event in user space.
*/
static ssize_t counter_set(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf,
size_t size)
{
int index = attr - counter_attrs;
acpi_event_status status;
acpi_handle handle;
int result = 0;
unsigned long tmp;
if (index == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI) {
int i;
for (i = 0; i < num_counters; ++i)
all_counters[i].count = 0;
acpi_gpe_count = 0;
acpi_irq_handled = 0;
acpi_irq_not_handled = 0;
goto end;
}
/* show the event status for both GPEs and Fixed Events */
result = get_status(index, &status, &handle);
if (result)
goto end;
if (!(status & ACPI_EVENT_FLAG_HAS_HANDLER)) {
printk(KERN_WARNING PREFIX
"Can not change Invalid GPE/Fixed Event status\n");
return -EINVAL;
}
if (index < num_gpes) {
if (!strcmp(buf, "disable\n") &&
(status & ACPI_EVENT_FLAG_ENABLED))
result = acpi_disable_gpe(handle, index);
else if (!strcmp(buf, "enable\n") &&
!(status & ACPI_EVENT_FLAG_ENABLED))
result = acpi_enable_gpe(handle, index);
else if (!strcmp(buf, "clear\n") &&
(status & ACPI_EVENT_FLAG_STATUS_SET))
result = acpi_clear_gpe(handle, index);
else if (!strcmp(buf, "mask\n"))
result = acpi_mask_gpe(handle, index, TRUE);
else if (!strcmp(buf, "unmask\n"))
result = acpi_mask_gpe(handle, index, FALSE);
else if (!kstrtoul(buf, 0, &tmp))
all_counters[index].count = tmp;
else
result = -EINVAL;
} else if (index < num_gpes + ACPI_NUM_FIXED_EVENTS) {
int event = index - num_gpes;
if (!strcmp(buf, "disable\n") &&
(status & ACPI_EVENT_FLAG_ENABLE_SET))
result = acpi_disable_event(event, ACPI_NOT_ISR);
else if (!strcmp(buf, "enable\n") &&
!(status & ACPI_EVENT_FLAG_ENABLE_SET))
result = acpi_enable_event(event, ACPI_NOT_ISR);
else if (!strcmp(buf, "clear\n") &&
(status & ACPI_EVENT_FLAG_STATUS_SET))
result = acpi_clear_event(event);
else if (!kstrtoul(buf, 0, &tmp))
all_counters[index].count = tmp;
else
result = -EINVAL;
} else
all_counters[index].count = strtoul(buf, NULL, 0);
if (ACPI_FAILURE(result))
result = -EINVAL;
end:
return result ? result : size;
}
/*
* A Quirk Mechanism for GPE Flooding Prevention:
*
* Quirks may be needed to prevent GPE flooding on a specific GPE. The
* flooding typically cannot be detected and automatically prevented by
* ACPI_GPE_DISPATCH_NONE check because there is a _Lxx/_Exx prepared in
* the AML tables. This normally indicates a feature gap in Linux, thus
* instead of providing endless quirk tables, we provide a boot parameter
* for those who want this quirk. For example, if the users want to prevent
* the GPE flooding for GPE 00, they need to specify the following boot
* parameter:
* acpi_mask_gpe=0x00
* The masking status can be modified by the following runtime controlling
* interface:
* echo unmask > /sys/firmware/acpi/interrupts/gpe00
*/
/*
* Currently, the GPE flooding prevention only supports to mask the GPEs
* numbered from 00 to 7f.
*/
#define ACPI_MASKABLE_GPE_MAX 0x80
static u64 __initdata acpi_masked_gpes;
static int __init acpi_gpe_set_masked_gpes(char *val)
{
u8 gpe;
if (kstrtou8(val, 0, &gpe) || gpe > ACPI_MASKABLE_GPE_MAX)
return -EINVAL;
acpi_masked_gpes |= ((u64)1<<gpe);
return 1;
}
__setup("acpi_mask_gpe=", acpi_gpe_set_masked_gpes);
void __init acpi_gpe_apply_masked_gpes(void)
{
acpi_handle handle;
acpi_status status;
u8 gpe;
for (gpe = 0;
gpe < min_t(u8, ACPI_MASKABLE_GPE_MAX, acpi_current_gpe_count);
gpe++) {
if (acpi_masked_gpes & ((u64)1<<gpe)) {
status = acpi_get_gpe_device(gpe, &handle);
if (ACPI_SUCCESS(status)) {
pr_info("Masking GPE 0x%x.\n", gpe);
(void)acpi_mask_gpe(handle, gpe, TRUE);
}
}
}
}
void acpi_irq_stats_init(void)
{
acpi_status status;
int i;
if (all_counters)
return;
num_gpes = acpi_current_gpe_count;
num_counters = num_gpes + ACPI_NUM_FIXED_EVENTS + NUM_COUNTERS_EXTRA;
all_attrs = kzalloc(sizeof(struct attribute *) * (num_counters + 1),
GFP_KERNEL);
if (all_attrs == NULL)
return;
all_counters = kzalloc(sizeof(struct event_counter) * (num_counters),
GFP_KERNEL);
if (all_counters == NULL)
goto fail;
status = acpi_install_global_event_handler(acpi_global_event_handler, NULL);
if (ACPI_FAILURE(status))
goto fail;
counter_attrs = kzalloc(sizeof(struct kobj_attribute) * (num_counters),
GFP_KERNEL);
if (counter_attrs == NULL)
goto fail;
for (i = 0; i < num_counters; ++i) {
char buffer[12];
char *name;
if (i < num_gpes)
sprintf(buffer, "gpe%02X", i);
else if (i == num_gpes + ACPI_EVENT_PMTIMER)
sprintf(buffer, "ff_pmtimer");
else if (i == num_gpes + ACPI_EVENT_GLOBAL)
sprintf(buffer, "ff_gbl_lock");
else if (i == num_gpes + ACPI_EVENT_POWER_BUTTON)
sprintf(buffer, "ff_pwr_btn");
else if (i == num_gpes + ACPI_EVENT_SLEEP_BUTTON)
sprintf(buffer, "ff_slp_btn");
else if (i == num_gpes + ACPI_EVENT_RTC)
sprintf(buffer, "ff_rt_clk");
else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_GPE)
sprintf(buffer, "gpe_all");
else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI)
sprintf(buffer, "sci");
else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_SCI_NOT)
sprintf(buffer, "sci_not");
else if (i == num_gpes + ACPI_NUM_FIXED_EVENTS + COUNT_ERROR)
sprintf(buffer, "error");
else
sprintf(buffer, "bug%02X", i);
name = kstrdup(buffer, GFP_KERNEL);
if (name == NULL)
goto fail;
sysfs_attr_init(&counter_attrs[i].attr);
counter_attrs[i].attr.name = name;
counter_attrs[i].attr.mode = 0644;
counter_attrs[i].show = counter_show;
counter_attrs[i].store = counter_set;
all_attrs[i] = &counter_attrs[i].attr;
}
interrupt_stats_attr_group.attrs = all_attrs;
if (!sysfs_create_group(acpi_kobj, &interrupt_stats_attr_group))
return;
fail:
delete_gpe_attr_array();
return;
}
static void __exit interrupt_stats_exit(void)
{
sysfs_remove_group(acpi_kobj, &interrupt_stats_attr_group);
delete_gpe_attr_array();
return;
}
static ssize_t
acpi_show_profile(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", acpi_gbl_FADT.preferred_profile);
}
static const struct device_attribute pm_profile_attr =
__ATTR(pm_profile, S_IRUGO, acpi_show_profile, NULL);
static ssize_t hotplug_enabled_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
return sprintf(buf, "%d\n", hotplug->enabled);
}
static ssize_t hotplug_enabled_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t size)
{
struct acpi_hotplug_profile *hotplug = to_acpi_hotplug_profile(kobj);
unsigned int val;
if (kstrtouint(buf, 10, &val) || val > 1)
return -EINVAL;
acpi_scan_hotplug_enabled(hotplug, val);
return size;
}
static struct kobj_attribute hotplug_enabled_attr =
__ATTR(enabled, S_IRUGO | S_IWUSR, hotplug_enabled_show,
hotplug_enabled_store);
static struct attribute *hotplug_profile_attrs[] = {
&hotplug_enabled_attr.attr,
NULL
};
static struct kobj_type acpi_hotplug_profile_ktype = {
.sysfs_ops = &kobj_sysfs_ops,
.default_attrs = hotplug_profile_attrs,
};
void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
const char *name)
{
int error;
if (!hotplug_kobj)
goto err_out;
error = kobject_init_and_add(&hotplug->kobj,
&acpi_hotplug_profile_ktype, hotplug_kobj, "%s", name);
if (error)
goto err_out;
kobject_uevent(&hotplug->kobj, KOBJ_ADD);
return;
err_out:
pr_err(PREFIX "Unable to add hotplug profile '%s'\n", name);
}
static ssize_t force_remove_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", 0);
}
static ssize_t force_remove_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t size)
{
bool val;
int ret;
ret = strtobool(buf, &val);
if (ret < 0)
return ret;
if (val) {
pr_err("Enabling force_remove is not supported anymore. Please report to linux-acpi@vger.kernel.org if you depend on this functionality\n");
return -EINVAL;
}
return size;
}
static const struct kobj_attribute force_remove_attr =
__ATTR(force_remove, S_IRUGO | S_IWUSR, force_remove_show,
force_remove_store);
int __init acpi_sysfs_init(void)
{
int result;
result = acpi_tables_sysfs_init();
if (result)
return result;
hotplug_kobj = kobject_create_and_add("hotplug", acpi_kobj);
if (!hotplug_kobj)
return -ENOMEM;
result = sysfs_create_file(hotplug_kobj, &force_remove_attr.attr);
if (result)
return result;
result = sysfs_create_file(acpi_kobj, &pm_profile_attr.attr);
return result;
}