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platform/x86/intel-uncore-freq: Process read/write blocked feature status

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When a feature is read blocked, don't continue to read uncore information
and register with uncore core.

When the feature is write blocked, continue to offer read interface but
block setting uncore limits.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20231204221740.3645130-6-srinivas.pandruvada@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Srinivas Pandruvada
2023-12-04 14:17:40 -08:00
committed by Hans de Goede
parent 8bed9ff7db
commit b06458d1b1
1 changed files with 15 additions and 0 deletions
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drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c
+15
View File
@@ -66,6 +66,7 @@ struct tpmi_uncore_struct {
int min_ratio;
struct tpmi_uncore_power_domain_info *pd_info;
struct tpmi_uncore_cluster_info root_cluster;
bool write_blocked;
};
#define UNCORE_GENMASK_MIN_RATIO GENMASK_ULL(21, 15)
@@ -157,6 +158,9 @@ static int uncore_write_control_freq(struct uncore_data *data, unsigned int inpu
cluster_info = container_of(data, struct tpmi_uncore_cluster_info, uncore_data);
uncore_root = cluster_info->uncore_root;
if (uncore_root->write_blocked)
return -EPERM;
/* Update each cluster in a package */
if (cluster_info->root_domain) {
struct tpmi_uncore_struct *uncore_root = cluster_info->uncore_root;
@@ -233,11 +237,21 @@ static void remove_cluster_entries(struct tpmi_uncore_struct *tpmi_uncore)
static int uncore_probe(struct auxiliary_device *auxdev, const struct auxiliary_device_id *id)
{
bool read_blocked = 0, write_blocked = 0;
struct intel_tpmi_plat_info *plat_info;
struct tpmi_uncore_struct *tpmi_uncore;
int ret, i, pkg = 0;
int num_resources;
ret = tpmi_get_feature_status(auxdev, TPMI_ID_UNCORE, &read_blocked, &write_blocked);
if (ret)
dev_info(&auxdev->dev, "Can't read feature status: ignoring blocked status\n");
if (read_blocked) {
dev_info(&auxdev->dev, "Firmware has blocked reads, exiting\n");
return -ENODEV;
}
/* Get number of power domains, which is equal to number of resources */
num_resources = tpmi_get_resource_count(auxdev);
if (!num_resources)
@@ -266,6 +280,7 @@ static int uncore_probe(struct auxiliary_device *auxdev, const struct auxiliary_
}
tpmi_uncore->power_domain_count = num_resources;
tpmi_uncore->write_blocked = write_blocked;
/* Get the package ID from the TPMI core */
plat_info = tpmi_get_platform_data(auxdev);