diff options
author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2023-09-25 22:42:19 +0300 |
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committer | Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> | 2023-10-04 11:57:32 +0300 |
commit | 8df012a7f513141412b3c35af204ccdb810fcc81 (patch) | |
tree | d824219e8b9617e91ad3327809a4741d00684c19 /drivers/platform/x86/intel/tpmi.c | |
parent | 4b0d9c8f8f55562ed5346723e66eec64f22887f4 (diff) | |
download | linux-8df012a7f513141412b3c35af204ccdb810fcc81.tar.xz |
platform/x86/intel/tpmi: Add debugfs support for read/write blocked
Display read and write blocked status of each TPMI feature in addition
to disabled and locked status.
This will require reading of read/write blocked state from the hardware.
Currently tpmi_read_feature_status(), doesn't provide this state.
Define TPMI feature state as defined in the TPMI spec. Modify the function
tpmi_read_feature_status() to update full feature state instead of just
disabled and locked state.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://lore.kernel.org/r/20230925194219.966602-1-srinivas.pandruvada@linux.intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Diffstat (limited to 'drivers/platform/x86/intel/tpmi.c')
-rw-r--r-- | drivers/platform/x86/intel/tpmi.c | 81 |
1 files changed, 56 insertions, 25 deletions
diff --git a/drivers/platform/x86/intel/tpmi.c b/drivers/platform/x86/intel/tpmi.c index 0a95736d97e4..311abcac894a 100644 --- a/drivers/platform/x86/intel/tpmi.c +++ b/drivers/platform/x86/intel/tpmi.c @@ -143,6 +143,33 @@ struct tpmi_info_header { u64 lock:1; } __packed; +/** + * struct tpmi_feature_state - Structure to read hardware state of a feature + * @enabled: Enable state of a feature, 1: enabled, 0: disabled + * @reserved_1: Reserved for future use + * @write_blocked: Writes are blocked means all write operations are ignored + * @read_blocked: Reads are blocked means will read 0xFFs + * @pcs_select: Interface used by out of band software, not used in OS + * @reserved_2: Reserved for future use + * @id: TPMI ID of the feature + * @reserved_3: Reserved for future use + * @locked: When set to 1, OS can't change this register. + * + * The structure is used to read hardware state of a TPMI feature. This + * information is used for debug and restricting operations for this feature. + */ +struct tpmi_feature_state { + u32 enabled:1; + u32 reserved_1:3; + u32 write_blocked:1; + u32 read_blocked:1; + u32 pcs_select:1; + u32 reserved_2:1; + u32 id:8; + u32 reserved_3:15; + u32 locked:1; +} __packed; + /* * List of supported TMPI IDs. * Some TMPI IDs are not used by Linux, so the numbers are not consecutive. @@ -202,6 +229,7 @@ EXPORT_SYMBOL_NS_GPL(tpmi_get_resource_at_index, INTEL_TPMI); #define TPMI_CONTROL_STATUS_OFFSET 0x00 #define TPMI_COMMAND_OFFSET 0x08 +#define TMPI_CONTROL_DATA_VAL_OFFSET 0x0c /* * Spec is calling for max 1 seconds to get ownership at the worst @@ -230,7 +258,6 @@ EXPORT_SYMBOL_NS_GPL(tpmi_get_resource_at_index, INTEL_TPMI); /* TPMI command data registers */ #define TMPI_CONTROL_DATA_CMD GENMASK_ULL(7, 0) -#define TMPI_CONTROL_DATA_VAL GENMASK_ULL(63, 32) #define TPMI_CONTROL_DATA_VAL_FEATURE GENMASK_ULL(48, 40) /* Command to send via control interface */ @@ -240,9 +267,6 @@ EXPORT_SYMBOL_NS_GPL(tpmi_get_resource_at_index, INTEL_TPMI); #define TPMI_CMD_LEN_MASK GENMASK_ULL(18, 16) -#define TPMI_STATE_DISABLED BIT_ULL(0) -#define TPMI_STATE_LOCKED BIT_ULL(31) - /* Mutex to complete get feature status without interruption */ static DEFINE_MUTEX(tpmi_dev_lock); @@ -256,7 +280,7 @@ static int tpmi_wait_for_owner(struct intel_tpmi_info *tpmi_info, u8 owner) } static int tpmi_read_feature_status(struct intel_tpmi_info *tpmi_info, int feature_id, - int *locked, int *disabled) + struct tpmi_feature_state *feature_state) { u64 control, data; int ret; @@ -306,17 +330,8 @@ static int tpmi_read_feature_status(struct intel_tpmi_info *tpmi_info, int featu } /* Response is ready */ - data = readq(tpmi_info->tpmi_control_mem + TPMI_COMMAND_OFFSET); - data = FIELD_GET(TMPI_CONTROL_DATA_VAL, data); - - *disabled = 0; - *locked = 0; - - if (!(data & TPMI_STATE_DISABLED)) - *disabled = 1; - - if (data & TPMI_STATE_LOCKED) - *locked = 1; + memcpy_fromio(feature_state, tpmi_info->tpmi_control_mem + TMPI_CONTROL_DATA_VAL_OFFSET, + sizeof(*feature_state)); ret = 0; @@ -335,34 +350,50 @@ int tpmi_get_feature_status(struct auxiliary_device *auxdev, int feature_id, { struct intel_vsec_device *intel_vsec_dev = dev_to_ivdev(auxdev->dev.parent); struct intel_tpmi_info *tpmi_info = auxiliary_get_drvdata(&intel_vsec_dev->auxdev); + struct tpmi_feature_state feature_state; + int ret; + + ret = tpmi_read_feature_status(tpmi_info, feature_id, &feature_state); + if (ret) + return ret; - return tpmi_read_feature_status(tpmi_info, feature_id, locked, disabled); + *locked = feature_state.locked; + *disabled = !feature_state.enabled; + + return 0; } EXPORT_SYMBOL_NS_GPL(tpmi_get_feature_status, INTEL_TPMI); static int tpmi_pfs_dbg_show(struct seq_file *s, void *unused) { struct intel_tpmi_info *tpmi_info = s->private; + int locked, disabled, read_blocked, write_blocked; + struct tpmi_feature_state feature_state; struct intel_tpmi_pm_feature *pfs; - int locked, disabled, ret, i; + int ret, i; + seq_printf(s, "tpmi PFS start offset 0x:%llx\n", tpmi_info->pfs_start); - seq_puts(s, "tpmi_id\t\tentries\t\tsize\t\tcap_offset\tattribute\tvsec_offset\tlocked\tdisabled\n"); + seq_puts(s, "tpmi_id\t\tentries\t\tsize\t\tcap_offset\tattribute\tvsec_offset\tlocked\tdisabled\tread_blocked\twrite_blocked\n"); for (i = 0; i < tpmi_info->feature_count; ++i) { pfs = &tpmi_info->tpmi_features[i]; - ret = tpmi_read_feature_status(tpmi_info, pfs->pfs_header.tpmi_id, &locked, - &disabled); + ret = tpmi_read_feature_status(tpmi_info, pfs->pfs_header.tpmi_id, &feature_state); if (ret) { locked = 'U'; disabled = 'U'; + read_blocked = 'U'; + write_blocked = 'U'; } else { - disabled = disabled ? 'Y' : 'N'; - locked = locked ? 'Y' : 'N'; + disabled = feature_state.enabled ? 'N' : 'Y'; + locked = feature_state.locked ? 'Y' : 'N'; + read_blocked = feature_state.read_blocked ? 'Y' : 'N'; + write_blocked = feature_state.write_blocked ? 'Y' : 'N'; } - seq_printf(s, "0x%02x\t\t0x%02x\t\t0x%04x\t\t0x%04x\t\t0x%02x\t\t0x%08x\t%c\t%c\n", + seq_printf(s, "0x%02x\t\t0x%02x\t\t0x%04x\t\t0x%04x\t\t0x%02x\t\t0x%08x\t%c\t%c\t\t%c\t\t%c\n", pfs->pfs_header.tpmi_id, pfs->pfs_header.num_entries, pfs->pfs_header.entry_size, pfs->pfs_header.cap_offset, - pfs->pfs_header.attribute, pfs->vsec_offset, locked, disabled); + pfs->pfs_header.attribute, pfs->vsec_offset, locked, disabled, + read_blocked, write_blocked); } return 0; |