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platform/x86/intel/pmc: Add PSON residency counter

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Tiger Lake platform onwards, devices have the capability to track the
duration of time that their Power Supply Units (PSUs) are turned off
during S0ix. This patch adds a debugfs file `pson_residency_usec` to
provide access to this counter.

Signed-off-by: Michael Bottini <michael.a.bottini@linux.intel.com>
Signed-off-by: Rajvi Jingar <rajvi.jingar@linux.intel.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Link: https://lore.kernel.org/r/20231219042216.2592029-2-rajvi.jingar@linux.intel.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Rajvi Jingar 2023-12-18 20:22:10 -08:00 committed by Hans de Goede
parent 1f5e56c9f6
commit b6258fa2c7
2 changed files with 39 additions and 0 deletions
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37
drivers/platform/x86/intel/pmc/core.c
View File

@ -208,6 +208,20 @@ static int pmc_core_dev_state_get(void *data, u64 *val)
DEFINE_DEBUGFS_ATTRIBUTE(pmc_core_dev_state, pmc_core_dev_state_get, NULL, "%llu\n");
static int pmc_core_pson_residency_get(void *data, u64 *val)
{
struct pmc *pmc = data;
const struct pmc_reg_map *map = pmc->map;
u32 value;
value = pmc_core_reg_read(pmc, map->pson_residency_offset);
*val = (u64)value * map->pson_residency_counter_step;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(pmc_core_pson_residency, pmc_core_pson_residency_get, NULL, "%llu\n");
static int pmc_core_check_read_lock_bit(struct pmc *pmc)
{
u32 value;
@ -1092,6 +1106,24 @@ int get_primary_reg_base(struct pmc *pmc)
return 0;
}
static bool pmc_core_is_pson_residency_enabled(struct pmc_dev *pmcdev)
{
struct platform_device *pdev = pmcdev->pdev;
struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
u8 val;
if (!adev)
return false;
if (fwnode_property_read_u8(acpi_fwnode_handle(adev),
"intel-cec-pson-switching-enabled-in-s0",
&val))
return false;
return val == 1;
}
static void pmc_core_dbgfs_unregister(struct pmc_dev *pmcdev)
{
debugfs_remove_recursive(pmcdev->dbgfs_dir);
@ -1162,6 +1194,11 @@ static void pmc_core_dbgfs_register(struct pmc_dev *pmcdev)
&pmc_core_substate_req_regs_fops);
}
if (primary_pmc->map->pson_residency_offset && pmc_core_is_pson_residency_enabled(pmcdev)) {
debugfs_create_file("pson_residency_usec", 0444,
pmcdev->dbgfs_dir, primary_pmc, &pmc_core_pson_residency);
}
if (pmcdev->has_die_c6) {
debugfs_create_file("die_c6_us_show", 0444,
pmcdev->dbgfs_dir, pmcdev,

2
drivers/platform/x86/intel/pmc/core.h
View File

@ -323,6 +323,8 @@ struct pmc_reg_map {
const u32 lpm_live_status_offset;
const u32 etr3_offset;
const u8 *lpm_reg_index;
const u32 pson_residency_offset;
const u32 pson_residency_counter_step;
};
/**