diff options
author | 2020-12-22 14:19:21 -0800 | |
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committer | 2020-12-22 14:19:21 -0800 | |
commit | 614cb5894306cfa2c7d9b6168182876ff5948735 (patch) | |
tree | 5a371efca8025fee23d52590f6e121c38e57e4a8 /drivers/acpi | |
parent | Merge tag 'pm-5.11-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ra... (diff) | |
parent | Merge branches 'acpi-scan', 'acpi-pnp' and 'acpi-sleep' (diff) | |
download | linux-614cb5894306cfa2c7d9b6168182876ff5948735.tar.gz linux-614cb5894306cfa2c7d9b6168182876ff5948735.tar.bz2 linux-614cb5894306cfa2c7d9b6168182876ff5948735.zip |
Merge tag 'acpi-5.11-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull more ACPI updates from Rafael Wysocki:
"These make the ACPI enumeration of devices take _DEP information into
account more aggressively, fix device IDs matching in the ACPI part of
the PNP devices framework and update the ACPI code related to
suspend-to-idle to take systems based on AMD hardware into account
properly.
Specifics:
- Modify the ACPI device enumeration code to defer the enumeration of
devices with an _HID whose lists of operation region dependencies
returned by _DEP are not empty after eliminating the entries
representing known-benign dependencies from them (Rafael Wysocki,
Hans de Goede).
- Make the ACPI PNP code mathing device IDs also take the length of
the given ID string into account (Hui Wang).
- Add AMD systems support to the ACPI code handling suspend-to-idle
via the PNP0D80 (System Power Management Controller) device _DSM
interface (Shyam Sundar).
- Move the suspend-to-idle handling code related to the PNP0D80
device _DSM interface, which is x86-specific, to a separate file in
the x86/ subdirectory (Rafael Wysocki)"
* tag 'acpi-5.11-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPI: PM: s2idle: Move x86-specific code to the x86 directory
ACPI: scan: Add Intel Baytrail Mailbox Device to acpi_ignore_dep_ids
ACPI: scan: Avoid unnecessary second pass in acpi_bus_scan()
ACPI: scan: Defer enumeration of devices with _DEP lists
ACPI: scan: Evaluate _DEP before adding the device
ACPI: PM: s2idle: Add AMD support to handle _DSM
ACPI: PNP: compare the string length in the matching_id()
Diffstat (limited to 'drivers/acpi')
-rw-r--r-- | drivers/acpi/Makefile | 1 | ||||
-rw-r--r-- | drivers/acpi/acpi_pnp.c | 3 | ||||
-rw-r--r-- | drivers/acpi/scan.c | 143 | ||||
-rw-r--r-- | drivers/acpi/sleep.c | 305 | ||||
-rw-r--r-- | drivers/acpi/sleep.h | 16 | ||||
-rw-r--r-- | drivers/acpi/x86/s2idle.c | 460 |
6 files changed, 598 insertions, 330 deletions
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 44e412506317..076894a3330f 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -54,6 +54,7 @@ acpi-y += property.o acpi-$(CONFIG_X86) += acpi_cmos_rtc.o acpi-$(CONFIG_X86) += x86/apple.o acpi-$(CONFIG_X86) += x86/utils.o +acpi-$(CONFIG_X86) += x86/s2idle.o acpi-$(CONFIG_DEBUG_FS) += debugfs.o acpi-y += acpi_lpat.o acpi-$(CONFIG_ACPI_LPIT) += acpi_lpit.o diff --git a/drivers/acpi/acpi_pnp.c b/drivers/acpi/acpi_pnp.c index 4ed755a963aa..8f2dc176bb41 100644 --- a/drivers/acpi/acpi_pnp.c +++ b/drivers/acpi/acpi_pnp.c @@ -319,6 +319,9 @@ static bool matching_id(const char *idstr, const char *list_id) { int i; + if (strlen(idstr) != strlen(list_id)) + return false; + if (memcmp(idstr, list_id, 3)) return false; diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index a1b226eb2ce2..80b668c80073 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -752,6 +752,7 @@ static bool acpi_info_matches_ids(struct acpi_device_info *info, /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */ static const char * const acpi_ignore_dep_ids[] = { "PNP0D80", /* Windows-compatible System Power Management Controller */ + "INT33BD", /* Intel Baytrail Mailbox Device */ NULL }; @@ -1635,8 +1636,6 @@ void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, device_initialize(&device->dev); dev_set_uevent_suppress(&device->dev, true); acpi_init_coherency(device); - /* Assume there are unmet deps until acpi_device_dep_initialize() runs */ - device->dep_unmet = 1; } void acpi_device_add_finalize(struct acpi_device *device) @@ -1842,32 +1841,36 @@ static void acpi_scan_init_hotplug(struct acpi_device *adev) } } -static void acpi_device_dep_initialize(struct acpi_device *adev) +static u32 acpi_scan_check_dep(acpi_handle handle) { - struct acpi_dep_data *dep; struct acpi_handle_list dep_devices; acpi_status status; + u32 count; int i; - adev->dep_unmet = 0; - - if (!acpi_has_method(adev->handle, "_DEP")) - return; + /* + * Check for _HID here to avoid deferring the enumeration of: + * 1. PCI devices. + * 2. ACPI nodes describing USB ports. + * Still, checking for _HID catches more then just these cases ... + */ + if (!acpi_has_method(handle, "_DEP") || !acpi_has_method(handle, "_HID")) + return 0; - status = acpi_evaluate_reference(adev->handle, "_DEP", NULL, - &dep_devices); + status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices); if (ACPI_FAILURE(status)) { - dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n"); - return; + acpi_handle_debug(handle, "Failed to evaluate _DEP.\n"); + return 0; } - for (i = 0; i < dep_devices.count; i++) { + for (count = 0, i = 0; i < dep_devices.count; i++) { struct acpi_device_info *info; - int skip; + struct acpi_dep_data *dep; + bool skip; status = acpi_get_object_info(dep_devices.handles[i], &info); if (ACPI_FAILURE(status)) { - dev_dbg(&adev->dev, "Error reading _DEP device info\n"); + acpi_handle_debug(handle, "Error reading _DEP device info\n"); continue; } @@ -1877,26 +1880,45 @@ static void acpi_device_dep_initialize(struct acpi_device *adev) if (skip) continue; - dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL); + dep = kzalloc(sizeof(*dep), GFP_KERNEL); if (!dep) - return; + continue; + + count++; dep->supplier = dep_devices.handles[i]; - dep->consumer = adev->handle; - adev->dep_unmet++; + dep->consumer = handle; mutex_lock(&acpi_dep_list_lock); list_add_tail(&dep->node , &acpi_dep_list); mutex_unlock(&acpi_dep_list_lock); } + + return count; } -static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, - void *not_used, void **return_value) +static void acpi_scan_dep_init(struct acpi_device *adev) +{ + struct acpi_dep_data *dep; + + mutex_lock(&acpi_dep_list_lock); + + list_for_each_entry(dep, &acpi_dep_list, node) { + if (dep->consumer == adev->handle) + adev->dep_unmet++; + } + + mutex_unlock(&acpi_dep_list_lock); +} + +static bool acpi_bus_scan_second_pass; + +static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep, + struct acpi_device **adev_p) { struct acpi_device *device = NULL; - int type; unsigned long long sta; + int type; int result; acpi_bus_get_device(handle, &device); @@ -1912,20 +1934,42 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, return AE_OK; } + if (type == ACPI_BUS_TYPE_DEVICE && check_dep) { + u32 count = acpi_scan_check_dep(handle); + /* Bail out if the number of recorded dependencies is not 0. */ + if (count > 0) { + acpi_bus_scan_second_pass = true; + return AE_CTRL_DEPTH; + } + } + acpi_add_single_object(&device, handle, type, sta); if (!device) return AE_CTRL_DEPTH; acpi_scan_init_hotplug(device); - acpi_device_dep_initialize(device); + if (!check_dep) + acpi_scan_dep_init(device); - out: - if (!*return_value) - *return_value = device; +out: + if (!*adev_p) + *adev_p = device; return AE_OK; } +static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used, + void *not_used, void **ret_p) +{ + return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p); +} + +static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used, + void *not_used, void **ret_p) +{ + return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p); +} + static void acpi_default_enumeration(struct acpi_device *device) { /* @@ -1993,12 +2037,16 @@ static int acpi_scan_attach_handler(struct acpi_device *device) return ret; } -static void acpi_bus_attach(struct acpi_device *device) +static void acpi_bus_attach(struct acpi_device *device, bool first_pass) { struct acpi_device *child; + bool skip = !first_pass && device->flags.visited; acpi_handle ejd; int ret; + if (skip) + goto ok; + if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd))) register_dock_dependent_device(device, ejd); @@ -2045,9 +2093,9 @@ static void acpi_bus_attach(struct acpi_device *device) ok: list_for_each_entry(child, &device->children, node) - acpi_bus_attach(child); + acpi_bus_attach(child, first_pass); - if (device->handler && device->handler->hotplug.notify_online) + if (!skip && device->handler && device->handler->hotplug.notify_online) device->handler->hotplug.notify_online(device); } @@ -2065,7 +2113,8 @@ void acpi_walk_dep_device_list(acpi_handle handle) adev->dep_unmet--; if (!adev->dep_unmet) - acpi_bus_attach(adev); + acpi_bus_attach(adev, true); + list_del(&dep->node); kfree(dep); } @@ -2090,17 +2139,37 @@ EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list); */ int acpi_bus_scan(acpi_handle handle) { - void *device = NULL; + struct acpi_device *device = NULL; + + acpi_bus_scan_second_pass = false; - if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) + /* Pass 1: Avoid enumerating devices with missing dependencies. */ + + if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device))) acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, - acpi_bus_check_add, NULL, NULL, &device); + acpi_bus_check_add_1, NULL, NULL, + (void **)&device); + + if (!device) + return -ENODEV; - if (device) { - acpi_bus_attach(device); + acpi_bus_attach(device, true); + + if (!acpi_bus_scan_second_pass) return 0; - } - return -ENODEV; + + /* Pass 2: Enumerate all of the remaining devices. */ + + device = NULL; + + if (ACPI_SUCCESS(acpi_bus_check_add(handle, false, &device))) + acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, + acpi_bus_check_add_2, NULL, NULL, + (void **)&device); + + acpi_bus_attach(device, false); + + return 0; } EXPORT_SYMBOL(acpi_bus_scan); diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index aff13bf4d947..09fd13757b65 100644 --- a/drivers/acpi/sleep.c +++ b/drivers/acpi/sleep.c @@ -92,10 +92,6 @@ bool acpi_sleep_state_supported(u8 sleep_state) } #ifdef CONFIG_ACPI_SLEEP -static bool sleep_no_lps0 __read_mostly; -module_param(sleep_no_lps0, bool, 0644); -MODULE_PARM_DESC(sleep_no_lps0, "Do not use the special LPS0 device interface"); - static u32 acpi_target_sleep_state = ACPI_STATE_S0; u32 acpi_target_system_state(void) @@ -165,7 +161,7 @@ static int __init init_nvs_nosave(const struct dmi_system_id *d) return 0; } -static bool acpi_sleep_default_s3; +bool acpi_sleep_default_s3; static int __init init_default_s3(const struct dmi_system_id *d) { @@ -688,268 +684,13 @@ static const struct platform_suspend_ops acpi_suspend_ops_old = { static bool s2idle_wakeup; -/* - * On platforms supporting the Low Power S0 Idle interface there is an ACPI - * device object with the PNP0D80 compatible device ID (System Power Management - * Controller) and a specific _DSM method under it. That method, if present, - * can be used to indicate to the platform that the OS is transitioning into a - * low-power state in which certain types of activity are not desirable or that - * it is leaving such a state, which allows the platform to adjust its operation - * mode accordingly. - */ -static const struct acpi_device_id lps0_device_ids[] = { - {"PNP0D80", }, - {"", }, -}; - -#define ACPI_LPS0_DSM_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66" - -#define ACPI_LPS0_GET_DEVICE_CONSTRAINTS 1 -#define ACPI_LPS0_SCREEN_OFF 3 -#define ACPI_LPS0_SCREEN_ON 4 -#define ACPI_LPS0_ENTRY 5 -#define ACPI_LPS0_EXIT 6 - -static acpi_handle lps0_device_handle; -static guid_t lps0_dsm_guid; -static char lps0_dsm_func_mask; - -/* Device constraint entry structure */ -struct lpi_device_info { - char *name; - int enabled; - union acpi_object *package; -}; - -/* Constraint package structure */ -struct lpi_device_constraint { - int uid; - int min_dstate; - int function_states; -}; - -struct lpi_constraints { - acpi_handle handle; - int min_dstate; -}; - -static struct lpi_constraints *lpi_constraints_table; -static int lpi_constraints_table_size; - -static void lpi_device_get_constraints(void) -{ - union acpi_object *out_obj; - int i; - - out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid, - 1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS, - NULL, ACPI_TYPE_PACKAGE); - - acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n", - out_obj ? "successful" : "failed"); - - if (!out_obj) - return; - - lpi_constraints_table = kcalloc(out_obj->package.count, - sizeof(*lpi_constraints_table), - GFP_KERNEL); - if (!lpi_constraints_table) - goto free_acpi_buffer; - - acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n"); - - for (i = 0; i < out_obj->package.count; i++) { - struct lpi_constraints *constraint; - acpi_status status; - union acpi_object *package = &out_obj->package.elements[i]; - struct lpi_device_info info = { }; - int package_count = 0, j; - - if (!package) - continue; - - for (j = 0; j < package->package.count; ++j) { - union acpi_object *element = - &(package->package.elements[j]); - - switch (element->type) { - case ACPI_TYPE_INTEGER: - info.enabled = element->integer.value; - break; - case ACPI_TYPE_STRING: - info.name = element->string.pointer; - break; - case ACPI_TYPE_PACKAGE: - package_count = element->package.count; - info.package = element->package.elements; - break; - } - } - - if (!info.enabled || !info.package || !info.name) - continue; - - constraint = &lpi_constraints_table[lpi_constraints_table_size]; - - status = acpi_get_handle(NULL, info.name, &constraint->handle); - if (ACPI_FAILURE(status)) - continue; - - acpi_handle_debug(lps0_device_handle, - "index:%d Name:%s\n", i, info.name); - - constraint->min_dstate = -1; - - for (j = 0; j < package_count; ++j) { - union acpi_object *info_obj = &info.package[j]; - union acpi_object *cnstr_pkg; - union acpi_object *obj; - struct lpi_device_constraint dev_info; - - switch (info_obj->type) { - case ACPI_TYPE_INTEGER: - /* version */ - break; - case ACPI_TYPE_PACKAGE: - if (info_obj->package.count < 2) - break; - - cnstr_pkg = info_obj->package.elements; - obj = &cnstr_pkg[0]; - dev_info.uid = obj->integer.value; - obj = &cnstr_pkg[1]; - dev_info.min_dstate = obj->integer.value; - - acpi_handle_debug(lps0_device_handle, - "uid:%d min_dstate:%s\n", - dev_info.uid, - acpi_power_state_string(dev_info.min_dstate)); - - constraint->min_dstate = dev_info.min_dstate; - break; - } - } - - if (constraint->min_dstate < 0) { - acpi_handle_debug(lps0_device_handle, - "Incomplete constraint defined\n"); - continue; - } - - lpi_constraints_table_size++; - } - - acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n"); - -free_acpi_buffer: - ACPI_FREE(out_obj); -} - -static void lpi_check_constraints(void) -{ - int i; - - for (i = 0; i < lpi_constraints_table_size; ++i) { - acpi_handle handle = lpi_constraints_table[i].handle; - struct acpi_device *adev; - - if (!handle || acpi_bus_get_device(handle, &adev)) - continue; - - acpi_handle_debug(handle, - "LPI: required min power state:%s current power state:%s\n", - acpi_power_state_string(lpi_constraints_table[i].min_dstate), - acpi_power_state_string(adev->power.state)); - - if (!adev->flags.power_manageable) { - acpi_handle_info(handle, "LPI: Device not power manageable\n"); - lpi_constraints_table[i].handle = NULL; - continue; - } - - if (adev->power.state < lpi_constraints_table[i].min_dstate) - acpi_handle_info(handle, - "LPI: Constraint not met; min power state:%s current power state:%s\n", - acpi_power_state_string(lpi_constraints_table[i].min_dstate), - acpi_power_state_string(adev->power.state)); - } -} - -static void acpi_sleep_run_lps0_dsm(unsigned int func) -{ - union acpi_object *out_obj; - - if (!(lps0_dsm_func_mask & (1 << func))) - return; - - out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL); - ACPI_FREE(out_obj); - - acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n", - func, out_obj ? "successful" : "failed"); -} - -static int lps0_device_attach(struct acpi_device *adev, - const struct acpi_device_id *not_used) -{ - union acpi_object *out_obj; - - if (lps0_device_handle) - return 0; - - if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)) - return 0; - - guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid); - /* Check if the _DSM is present and as expected. */ - out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL); - if (!out_obj || out_obj->type != ACPI_TYPE_BUFFER) { - acpi_handle_debug(adev->handle, - "_DSM function 0 evaluation failed\n"); - return 0; - } - - lps0_dsm_func_mask = *(char *)out_obj->buffer.pointer; - - ACPI_FREE(out_obj); - - acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n", - lps0_dsm_func_mask); - - lps0_device_handle = adev->handle; - - lpi_device_get_constraints(); - - /* - * Use suspend-to-idle by default if the default suspend mode was not - * set from the command line. - */ - if (mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3) - mem_sleep_current = PM_SUSPEND_TO_IDLE; - - /* - * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the - * EC GPE to be enabled while suspended for certain wakeup devices to - * work, so mark it as wakeup-capable. - */ - acpi_ec_mark_gpe_for_wake(); - - return 0; -} - -static struct acpi_scan_handler lps0_handler = { - .ids = lps0_device_ids, - .attach = lps0_device_attach, -}; - -static int acpi_s2idle_begin(void) +int acpi_s2idle_begin(void) { acpi_scan_lock_acquire(); return 0; } -static int acpi_s2idle_prepare(void) +int acpi_s2idle_prepare(void) { if (acpi_sci_irq_valid()) { enable_irq_wake(acpi_sci_irq); @@ -966,21 +707,7 @@ static int acpi_s2idle_prepare(void) return 0; } -static int acpi_s2idle_prepare_late(void) -{ - if (!lps0_device_handle || sleep_no_lps0) - return 0; - - if (pm_debug_messages_on) - lpi_check_constraints(); - - acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF); - acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY); - - return 0; -} - -static bool acpi_s2idle_wake(void) +bool acpi_s2idle_wake(void) { if (!acpi_sci_irq_valid()) return pm_wakeup_pending(); @@ -1046,16 +773,7 @@ static bool acpi_s2idle_wake(void) return false; } -static void acpi_s2idle_restore_early(void) -{ - if (!lps0_device_handle || sleep_no_lps0) - return; - - acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT); - acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON); -} - -static void acpi_s2idle_restore(void) +void acpi_s2idle_restore(void) { /* * Drain pending events before restoring the working-state configuration @@ -1077,7 +795,7 @@ static void acpi_s2idle_restore(void) } } -static void acpi_s2idle_end(void) +void acpi_s2idle_end(void) { acpi_scan_lock_release(); } @@ -1085,13 +803,16 @@ static void acpi_s2idle_end(void) static const struct platform_s2idle_ops acpi_s2idle_ops = { .begin = acpi_s2idle_begin, .prepare = acpi_s2idle_prepare, - .prepare_late = acpi_s2idle_prepare_late, .wake = acpi_s2idle_wake, - .restore_early = acpi_s2idle_restore_early, .restore = acpi_s2idle_restore, .end = acpi_s2idle_end, }; +void __weak acpi_s2idle_setup(void) +{ + s2idle_set_ops(&acpi_s2idle_ops); +} + static void acpi_sleep_suspend_setup(void) { int i; @@ -1103,13 +824,11 @@ static void acpi_sleep_suspend_setup(void) suspend_set_ops(old_suspend_ordering ? &acpi_suspend_ops_old : &acpi_suspend_ops); - acpi_scan_add_handler(&lps0_handler); - s2idle_set_ops(&acpi_s2idle_ops); + acpi_s2idle_setup(); } #else /* !CONFIG_SUSPEND */ #define s2idle_wakeup (false) -#define lps0_device_handle (NULL) static inline void acpi_sleep_suspend_setup(void) {} #endif /* !CONFIG_SUSPEND */ diff --git a/drivers/acpi/sleep.h b/drivers/acpi/sleep.h index 3d90480ce1b1..1856f76ac83f 100644 --- a/drivers/acpi/sleep.h +++ b/drivers/acpi/sleep.h @@ -15,3 +15,19 @@ static inline acpi_status acpi_set_waking_vector(u32 wakeup_address) return acpi_set_firmware_waking_vector( (acpi_physical_address)wakeup_address, 0); } + +extern int acpi_s2idle_begin(void); +extern int acpi_s2idle_prepare(void); +extern int acpi_s2idle_prepare_late(void); +extern bool acpi_s2idle_wake(void); +extern void acpi_s2idle_restore_early(void); +extern void acpi_s2idle_restore(void); +extern void acpi_s2idle_end(void); + +extern void acpi_s2idle_setup(void); + +#ifdef CONFIG_ACPI_SLEEP +extern bool acpi_sleep_default_s3; +#else +#define acpi_sleep_default_s3 (1) +#endif diff --git a/drivers/acpi/x86/s2idle.c b/drivers/acpi/x86/s2idle.c new file mode 100644 index 000000000000..25fea34b544c --- /dev/null +++ b/drivers/acpi/x86/s2idle.c @@ -0,0 +1,460 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Architecture-specific ACPI-based support for suspend-to-idle. + * + * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> + * Author: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> + * Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com> + * + * On platforms supporting the Low Power S0 Idle interface there is an ACPI + * device object with the PNP0D80 compatible device ID (System Power Management + * Controller) and a specific _DSM method under it. That method, if present, + * can be used to indicate to the platform that the OS is transitioning into a + * low-power state in which certain types of activity are not desirable or that + * it is leaving such a state, which allows the platform to adjust its operation + * mode accordingly. + */ + +#include <linux/acpi.h> +#include <linux/device.h> +#include <linux/suspend.h> + +#include "../sleep.h" + +#ifdef CONFIG_SUSPEND + +static bool sleep_no_lps0 __read_mostly; +module_param(sleep_no_lps0, bool, 0644); +MODULE_PARM_DESC(sleep_no_lps0, "Do not use the special LPS0 device interface"); + +static const struct acpi_device_id lps0_device_ids[] = { + {"PNP0D80", }, + {"", }, +}; + +#define ACPI_LPS0_DSM_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66" + +#define ACPI_LPS0_GET_DEVICE_CONSTRAINTS 1 +#define ACPI_LPS0_SCREEN_OFF 3 +#define ACPI_LPS0_SCREEN_ON 4 +#define ACPI_LPS0_ENTRY 5 +#define ACPI_LPS0_EXIT 6 + +/* AMD */ +#define ACPI_LPS0_DSM_UUID_AMD "e3f32452-febc-43ce-9039-932122d37721" +#define ACPI_LPS0_SCREEN_OFF_AMD 4 +#define ACPI_LPS0_SCREEN_ON_AMD 5 + +static acpi_handle lps0_device_handle; +static guid_t lps0_dsm_guid; +static char lps0_dsm_func_mask; + +/* Device constraint entry structure */ +struct lpi_device_info { + char *name; + int enabled; + union acpi_object *package; +}; + +/* Constraint package structure */ +struct lpi_device_constraint { + int uid; + int min_dstate; + int function_states; +}; + +struct lpi_constraints { + acpi_handle handle; + int min_dstate; +}; + +/* AMD */ +/* Device constraint entry structure */ +struct lpi_device_info_amd { + int revision; + int count; + union acpi_object *package; +}; + +/* Constraint package structure */ +struct lpi_device_constraint_amd { + char *name; + int enabled; + int function_states; + int min_dstate; +}; + +static struct lpi_constraints *lpi_constraints_table; +static int lpi_constraints_table_size; +static int rev_id; + +static void lpi_device_get_constraints_amd(void) +{ + union acpi_object *out_obj; + int i, j, k; + + out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid, + 1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS, + NULL, ACPI_TYPE_PACKAGE); + + if (!out_obj) + return; + + acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n", + out_obj ? "successful" : "failed"); + + for (i = 0; i < out_obj->package.count; i++) { + union acpi_object *package = &out_obj->package.elements[i]; + struct lpi_device_info_amd info = { }; + + if (package->type == ACPI_TYPE_INTEGER) { + switch (i) { + case 0: + info.revision = package->integer.value; + break; + case 1: + info.count = package->integer.value; + break; + } + } else if (package->type == ACPI_TYPE_PACKAGE) { + lpi_constraints_table = kcalloc(package->package.count, + sizeof(*lpi_constraints_table), + GFP_KERNEL); + + if (!lpi_constraints_table) + goto free_acpi_buffer; + + acpi_handle_debug(lps0_device_handle, + "LPI: constraints list begin:\n"); + + for (j = 0; j < package->package.count; ++j) { + union acpi_object *info_obj = &package->package.elements[j]; + struct lpi_device_constraint_amd dev_info = {}; + struct lpi_constraints *list; + acpi_status status; + + for (k = 0; k < info_obj->package.count; ++k) { + union acpi_object *obj = &info_obj->package.elements[k]; + union acpi_object *obj_new; + + list = &lpi_constraints_table[lpi_constraints_table_size]; + list->min_dstate = -1; + + obj_new = &obj[k]; + switch (k) { + case 0: + dev_info.enabled = obj->integer.value; + break; + case 1: + dev_info.name = obj->string.pointer; + break; + case 2: + dev_info.function_states = obj->integer.value; + break; + case 3: + dev_info.min_dstate = obj->integer.value; + break; + } + + if (!dev_info.enabled || !dev_info.name || + !dev_info.min_dstate) + continue; + + status = acpi_get_handle(NULL, dev_info.name, + &list->handle); + if (ACPI_FAILURE(status)) + continue; + + acpi_handle_debug(lps0_device_handle, + "Name:%s\n", dev_info.name); + + list->min_dstate = dev_info.min_dstate; + + if (list->min_dstate < 0) { + acpi_handle_debug(lps0_device_handle, + "Incomplete constraint defined\n"); + continue; + } + } + lpi_constraints_table_size++; + } + } + } + + acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n"); + +free_acpi_buffer: + ACPI_FREE(out_obj); +} + +static void lpi_device_get_constraints(void) +{ + union acpi_object *out_obj; + int i; + + out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid, + 1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS, + NULL, ACPI_TYPE_PACKAGE); + + acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n", + out_obj ? "successful" : "failed"); + + if (!out_obj) + return; + + lpi_constraints_table = kcalloc(out_obj->package.count, + sizeof(*lpi_constraints_table), + GFP_KERNEL); + if (!lpi_constraints_table) + goto free_acpi_buffer; + + acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n"); + + for (i = 0; i < out_obj->package.count; i++) { + struct lpi_constraints *constraint; + acpi_status status; + union acpi_object *package = &out_obj->package.elements[i]; + struct lpi_device_info info = { }; + int package_count = 0, j; + + if (!package) + continue; + + for (j = 0; j < package->package.count; ++j) { + union acpi_object *element = + &(package->package.elements[j]); + + switch (element->type) { + case ACPI_TYPE_INTEGER: + info.enabled = element->integer.value; + break; + case ACPI_TYPE_STRING: + info.name = element->string.pointer; + break; + case ACPI_TYPE_PACKAGE: + package_count = element->package.count; + info.package = element->package.elements; + break; + } + } + + if (!info.enabled || !info.package || !info.name) + continue; + + constraint = &lpi_constraints_table[lpi_constraints_table_size]; + + status = acpi_get_handle(NULL, info.name, &constraint->handle); + if (ACPI_FAILURE(status)) + continue; + + acpi_handle_debug(lps0_device_handle, + "index:%d Name:%s\n", i, info.name); + + constraint->min_dstate = -1; + + for (j = 0; j < package_count; ++j) { + union acpi_object *info_obj = &info.package[j]; + union acpi_object *cnstr_pkg; + union acpi_object *obj; + struct lpi_device_constraint dev_info; + + switch (info_obj->type) { + case ACPI_TYPE_INTEGER: + /* version */ + break; + case ACPI_TYPE_PACKAGE: + if (info_obj->package.count < 2) + break; + + cnstr_pkg = info_obj->package.elements; + obj = &cnstr_pkg[0]; + dev_info.uid = obj->integer.value; + obj = &cnstr_pkg[1]; + dev_info.min_dstate = obj->integer.value; + + acpi_handle_debug(lps0_device_handle, + "uid:%d min_dstate:%s\n", + dev_info.uid, + acpi_power_state_string(dev_info.min_dstate)); + + constraint->min_dstate = dev_info.min_dstate; + break; + } + } + + if (constraint->min_dstate < 0) { + acpi_handle_debug(lps0_device_handle, + "Incomplete constraint defined\n"); + continue; + } + + lpi_constraints_table_size++; + } + + acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n"); + +free_acpi_buffer: + ACPI_FREE(out_obj); +} + +static void lpi_check_constraints(void) +{ + int i; + + for (i = 0; i < lpi_constraints_table_size; ++i) { + acpi_handle handle = lpi_constraints_table[i].handle; + struct acpi_device *adev; + + if (!handle || acpi_bus_get_device(handle, &adev)) + continue; + + acpi_handle_debug(handle, + "LPI: required min power state:%s current power state:%s\n", + acpi_power_state_string(lpi_constraints_table[i].min_dstate), + acpi_power_state_string(adev->power.state)); + + if (!adev->flags.power_manageable) { + acpi_handle_info(handle, "LPI: Device not power manageable\n"); + lpi_constraints_table[i].handle = NULL; + continue; + } + + if (adev->power.state < lpi_constraints_table[i].min_dstate) + acpi_handle_info(handle, + "LPI: Constraint not met; min power state:%s current power state:%s\n", + acpi_power_state_string(lpi_constraints_table[i].min_dstate), + acpi_power_state_string(adev->power.state)); + } +} + +static void acpi_sleep_run_lps0_dsm(unsigned int func) +{ + union acpi_object *out_obj; + + if (!(lps0_dsm_func_mask & (1 << func))) + return; + + out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, rev_id, func, NULL); + ACPI_FREE(out_obj); + + acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n", + func, out_obj ? "successful" : "failed"); +} + +static bool acpi_s2idle_vendor_amd(void) +{ + return boot_cpu_data.x86_vendor == X86_VENDOR_AMD; +} + +static int lps0_device_attach(struct acpi_device *adev, + const struct acpi_device_id *not_used) +{ + union acpi_object *out_obj; + + if (lps0_device_handle) + return 0; + + if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)) + return 0; + + if (acpi_s2idle_vendor_amd()) { + guid_parse(ACPI_LPS0_DSM_UUID_AMD, &lps0_dsm_guid); + out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 0, 0, NULL); + rev_id = 0; + } else { + guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid); + out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL); + rev_id = 1; + } + + /* Check if the _DSM is present and as expected. */ + if (!out_obj || out_obj->type != ACPI_TYPE_BUFFER) { + acpi_handle_debug(adev->handle, + "_DSM function 0 evaluation failed\n"); + return 0; + } + + lps0_dsm_func_mask = *(char *)out_obj->buffer.pointer; + + ACPI_FREE(out_obj); + + acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n", + lps0_dsm_func_mask); + + lps0_device_handle = adev->handle; + + if (acpi_s2idle_vendor_amd()) + lpi_device_get_constraints_amd(); + else + lpi_device_get_constraints(); + + /* + * Use suspend-to-idle by default if the default suspend mode was not + * set from the command line. + */ + if (mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3) + mem_sleep_current = PM_SUSPEND_TO_IDLE; + + /* + * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the + * EC GPE to be enabled while suspended for certain wakeup devices to + * work, so mark it as wakeup-capable. + */ + acpi_ec_mark_gpe_for_wake(); + + return 0; +} + +static struct acpi_scan_handler lps0_handler = { + .ids = lps0_device_ids, + .attach = lps0_device_attach, +}; + +int acpi_s2idle_prepare_late(void) +{ + if (!lps0_device_handle || sleep_no_lps0) + return 0; + + if (pm_debug_messages_on) + lpi_check_constraints(); + + if (acpi_s2idle_vendor_amd()) { + acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF_AMD); + } else { + acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF); + acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY); + } + + return 0; +} + +void acpi_s2idle_restore_early(void) +{ + if (!lps0_device_handle || sleep_no_lps0) + return; + + if (acpi_s2idle_vendor_amd()) { + acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON_AMD); + } else { + acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT); + acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON); + } +} + +static const struct platform_s2idle_ops acpi_s2idle_ops_lps0 = { + .begin = acpi_s2idle_begin, + .prepare = acpi_s2idle_prepare, + .prepare_late = acpi_s2idle_prepare_late, + .wake = acpi_s2idle_wake, + .restore_early = acpi_s2idle_restore_early, + .restore = acpi_s2idle_restore, + .end = acpi_s2idle_end, +}; + +void acpi_s2idle_setup(void) +{ + acpi_scan_add_handler(&lps0_handler); + s2idle_set_ops(&acpi_s2idle_ops_lps0); +} + +#endif /* CONFIG_SUSPEND */ |