From b6258fa2c7b3dd23e362801410f171567d0d16af Mon Sep 17 00:00:00 2001 From: Rajvi Jingar Date: Mon, 18 Dec 2023 20:22:10 -0800 Subject: platform/x86/intel/pmc: Add PSON residency counter 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 Signed-off-by: Rajvi Jingar Signed-off-by: David E. Box Link: https://lore.kernel.org/r/20231219042216.2592029-2-rajvi.jingar@linux.intel.com Reviewed-by: Hans de Goede Signed-off-by: Hans de Goede --- drivers/platform/x86/intel/pmc/core.c | 37 +++++++++++++++++++++++++++++++++++ drivers/platform/x86/intel/pmc/core.h | 2 ++ 2 files changed, 39 insertions(+) (limited to 'drivers/platform/x86') diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c index 983e3a8f4910..91e5e500eb41 100644 --- a/drivers/platform/x86/intel/pmc/core.c +++ b/drivers/platform/x86/intel/pmc/core.c @@ -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, diff --git a/drivers/platform/x86/intel/pmc/core.h b/drivers/platform/x86/intel/pmc/core.h index 6d7673145f90..91cb34a6505c 100644 --- a/drivers/platform/x86/intel/pmc/core.h +++ b/drivers/platform/x86/intel/pmc/core.h @@ -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; }; /** -- cgit v1.2.3