[PATCH] platform/x86/intel/tpmi: Add debugfs support for read/write blocked
From: Srinivas Pandruvada
Date: Mon Sep 25 2023 - 15:42:35 EST
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@xxxxxxxxxxxxxxx>
---
drivers/platform/x86/intel/tpmi.c | 81 +++++++++++++++++++++----------
1 file 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;
--
2.41.0