drm/xe: Expose fan control and voltage regulator version

Add sysfs attributes for late binding features which expose bound version
to the user.

v2: Rework attribute and macro naming (Badal)
v3: Drop fancy formatting (Rodrigo)
v4: Form version string using local variables (Rodrigo)

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://lore.kernel.org/r/20250709164224.2676086-1-raag.jadav@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/xe/xe_device_sysfs.c b/drivers/gpu/drm/xe/xe_device_sysfs.c
index b9440f8c781e3b22ec686f802049646a31b31319..e5fd0cd537bceb78a6745247c59b65122d3f9174 100644 (file)
--- a/drivers/gpu/drm/xe/xe_device_sysfs.c
+++ b/drivers/gpu/drm/xe/xe_device_sysfs.c
@@ -24,6 +24,12 @@
  *
  * vram_d3cold_threshold - Report/change vram used threshold(in MB) below
  * which vram save/restore is permissible during runtime D3cold entry/exit.
+ *
+ * lb_fan_control_version - Fan control version provisioned by late binding.
+ * Exposed only if supported by the device.
+ *
+ * lb_voltage_regulator_version - Voltage regulator version provisioned by late
+ * binding. Exposed only if supported by the device.
  */
 
 static ssize_t
@@ -65,6 +71,135 @@ vram_d3cold_threshold_store(struct device *dev, struct device_attribute *attr,
 
 static DEVICE_ATTR_RW(vram_d3cold_threshold);
 
+static ssize_t
+lb_fan_control_version_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+       struct xe_device *xe = pdev_to_xe_device(to_pci_dev(dev));
+       struct xe_tile *root = xe_device_get_root_tile(xe);
+       u32 cap, ver_low = FAN_TABLE, ver_high = FAN_TABLE;
+       u16 major = 0, minor = 0, hotfix = 0, build = 0;
+       int ret;
+
+       xe_pm_runtime_get(xe);
+
+       ret = xe_pcode_read(root, PCODE_MBOX(PCODE_LATE_BINDING, GET_CAPABILITY_STATUS, 0),
+                           &cap, NULL);
+       if (ret)
+               goto out;
+
+       if (REG_FIELD_GET(V1_FAN_PROVISIONED, cap)) {
+               ret = xe_pcode_read(root, PCODE_MBOX(PCODE_LATE_BINDING, GET_VERSION_LOW, 0),
+                                   &ver_low, NULL);
+               if (ret)
+                       goto out;
+
+               ret = xe_pcode_read(root, PCODE_MBOX(PCODE_LATE_BINDING, GET_VERSION_HIGH, 0),
+                                   &ver_high, NULL);
+               if (ret)
+                       goto out;
+
+               major = REG_FIELD_GET(MAJOR_VERSION_MASK, ver_low);
+               minor = REG_FIELD_GET(MINOR_VERSION_MASK, ver_low);
+               hotfix = REG_FIELD_GET(HOTFIX_VERSION_MASK, ver_high);
+               build = REG_FIELD_GET(BUILD_VERSION_MASK, ver_high);
+       }
+out:
+       xe_pm_runtime_put(xe);
+
+       return ret ?: sysfs_emit(buf, "%u.%u.%u.%u\n", major, minor, hotfix, build);
+}
+static DEVICE_ATTR_ADMIN_RO(lb_fan_control_version);
+
+static ssize_t
+lb_voltage_regulator_version_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+       struct xe_device *xe = pdev_to_xe_device(to_pci_dev(dev));
+       struct xe_tile *root = xe_device_get_root_tile(xe);
+       u32 cap, ver_low = VR_CONFIG, ver_high = VR_CONFIG;
+       u16 major = 0, minor = 0, hotfix = 0, build = 0;
+       int ret;
+
+       xe_pm_runtime_get(xe);
+
+       ret = xe_pcode_read(root, PCODE_MBOX(PCODE_LATE_BINDING, GET_CAPABILITY_STATUS, 0),
+                           &cap, NULL);
+       if (ret)
+               goto out;
+
+       if (REG_FIELD_GET(VR_PARAMS_PROVISIONED, cap)) {
+               ret = xe_pcode_read(root, PCODE_MBOX(PCODE_LATE_BINDING, GET_VERSION_LOW, 0),
+                                   &ver_low, NULL);
+               if (ret)
+                       goto out;
+
+               ret = xe_pcode_read(root, PCODE_MBOX(PCODE_LATE_BINDING, GET_VERSION_HIGH, 0),
+                                   &ver_high, NULL);
+               if (ret)
+                       goto out;
+
+               major = REG_FIELD_GET(MAJOR_VERSION_MASK, ver_low);
+               minor = REG_FIELD_GET(MINOR_VERSION_MASK, ver_low);
+               hotfix = REG_FIELD_GET(HOTFIX_VERSION_MASK, ver_high);
+               build = REG_FIELD_GET(BUILD_VERSION_MASK, ver_high);
+       }
+out:
+       xe_pm_runtime_put(xe);
+
+       return ret ?: sysfs_emit(buf, "%u.%u.%u.%u\n", major, minor, hotfix, build);
+}
+static DEVICE_ATTR_ADMIN_RO(lb_voltage_regulator_version);
+
+static int late_bind_create_files(struct device *dev)
+{
+       struct xe_device *xe = pdev_to_xe_device(to_pci_dev(dev));
+       struct xe_tile *root = xe_device_get_root_tile(xe);
+       u32 cap;
+       int ret;
+
+       xe_pm_runtime_get(xe);
+
+       ret = xe_pcode_read(root, PCODE_MBOX(PCODE_LATE_BINDING, GET_CAPABILITY_STATUS, 0),
+                           &cap, NULL);
+       if (ret)
+               goto out;
+
+       if (REG_FIELD_GET(V1_FAN_SUPPORTED, cap)) {
+               ret = sysfs_create_file(&dev->kobj, &dev_attr_lb_fan_control_version.attr);
+               if (ret)
+                       goto out;
+       }
+
+       if (REG_FIELD_GET(VR_PARAMS_SUPPORTED, cap))
+               ret = sysfs_create_file(&dev->kobj, &dev_attr_lb_voltage_regulator_version.attr);
+out:
+       xe_pm_runtime_put(xe);
+
+       return ret;
+}
+
+static void late_bind_remove_files(struct device *dev)
+{
+       struct xe_device *xe = pdev_to_xe_device(to_pci_dev(dev));
+       struct xe_tile *root = xe_device_get_root_tile(xe);
+       u32 cap;
+       int ret;
+
+       xe_pm_runtime_get(xe);
+
+       ret = xe_pcode_read(root, PCODE_MBOX(PCODE_LATE_BINDING, GET_CAPABILITY_STATUS, 0),
+                           &cap, NULL);
+       if (ret)
+               goto out;
+
+       if (REG_FIELD_GET(V1_FAN_SUPPORTED, cap))
+               sysfs_remove_file(&dev->kobj, &dev_attr_lb_fan_control_version.attr);
+
+       if (REG_FIELD_GET(VR_PARAMS_SUPPORTED, cap))
+               sysfs_remove_file(&dev->kobj, &dev_attr_lb_voltage_regulator_version.attr);
+out:
+       xe_pm_runtime_put(xe);
+}
+
 /**
  * DOC: PCIe Gen5 Limitations
  *
@@ -151,8 +286,10 @@ static void xe_device_sysfs_fini(void *arg)
        if (xe->d3cold.capable)
                sysfs_remove_file(&xe->drm.dev->kobj, &dev_attr_vram_d3cold_threshold.attr);
 
-       if (xe->info.platform == XE_BATTLEMAGE)
+       if (xe->info.platform == XE_BATTLEMAGE) {
                sysfs_remove_files(&xe->drm.dev->kobj, auto_link_downgrade_attrs);
+               late_bind_remove_files(xe->drm.dev);
+       }
 }
 
 int xe_device_sysfs_init(struct xe_device *xe)
@@ -170,6 +307,10 @@ int xe_device_sysfs_init(struct xe_device *xe)
                ret = sysfs_create_files(&dev->kobj, auto_link_downgrade_attrs);
                if (ret)
                        return ret;
+
+               ret = late_bind_create_files(dev);
+               if (ret)
+                       return ret;
        }
 
        return devm_add_action_or_reset(dev, xe_device_sysfs_fini, xe);

diff --git a/drivers/gpu/drm/xe/xe_pcode_api.h b/drivers/gpu/drm/xe/xe_pcode_api.h
index 0befdea77db15d20918f9cc31ce57239fa63abb2..92bfcba51e199c06d24056896f7877e57b7cd69a 100644 (file)
--- a/drivers/gpu/drm/xe/xe_pcode_api.h
+++ b/drivers/gpu/drm/xe/xe_pcode_api.h
@@ -50,6 +50,21 @@
 #define        READ_PL_FROM_FW                         0x1
 #define        READ_PL_FROM_PCODE                      0x0
 
+#define   PCODE_LATE_BINDING                   0x5C
+#define     GET_CAPABILITY_STATUS              0x0
+#define       V1_FAN_SUPPORTED                 REG_BIT(0)
+#define       VR_PARAMS_SUPPORTED              REG_BIT(3)
+#define       V1_FAN_PROVISIONED               REG_BIT(16)
+#define       VR_PARAMS_PROVISIONED            REG_BIT(19)
+#define     GET_VERSION_LOW                    0x1
+#define     GET_VERSION_HIGH                   0x2
+#define       MAJOR_VERSION_MASK               REG_GENMASK(31, 16)
+#define       MINOR_VERSION_MASK               REG_GENMASK(15, 0)
+#define       HOTFIX_VERSION_MASK              REG_GENMASK(31, 16)
+#define       BUILD_VERSION_MASK               REG_GENMASK(15, 0)
+#define       FAN_TABLE                                1
+#define       VR_CONFIG                                2
+
 #define   PCODE_FREQUENCY_CONFIG               0x6e
 /* Frequency Config Sub Commands (param1) */
 #define     PCODE_MBOX_FC_SC_READ_FUSED_P0     0x0