[PATCH v7 2/2] drm/i915/uapi: Add query for hwconfig blob

[Jordan Justen]

From: Rodrigo Vivi <rodrigo.vivi at intel.com>

In this interface i915 is returning a blob of data which it receives
from the guc software. This blob provides some useful data about the
hardware for drivers. The format of this blob will be documented in
the Programmer Reference Manuals when released.

Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Cc: Kenneth Graunke <kenneth.w.graunke at intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Slawomir Milczarek <slawomir.milczarek at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
Reviewed-by: Matthew Brost <matthew.brost at intel.com>
Acked-by: Jordan Justen <jordan.l.justen at intel.com>
Tested-by: Jordan Justen <jordan.l.justen at intel.com>
Acked-by: Jon Bloomfield <jon.bloomfield at intel.com>
---
 drivers/gpu/drm/i915/i915_query.c | 23 +++++++++++++++++++++++
 include/uapi/drm/i915_drm.h       |  1 +
 2 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c
index 2dfbc22857a3..b5ca00cb6cf6 100644
--- a/drivers/gpu/drm/i915/i915_query.c
+++ b/drivers/gpu/drm/i915/i915_query.c
@@ -479,12 +479,35 @@ static int query_memregion_info(struct drm_i915_private *i915,
 	return total_length;
 }
 
+static int query_hwconfig_blob(struct drm_i915_private *i915,
+			       struct drm_i915_query_item *query_item)
+{
+	struct intel_gt *gt = to_gt(i915);
+	struct intel_hwconfig *hwconfig = &gt->info.hwconfig;
+
+	if (!hwconfig->size || !hwconfig->ptr)
+		return -ENODEV;
+
+	if (query_item->length == 0)
+		return hwconfig->size;
+
+	if (query_item->length < hwconfig->size)
+		return -EINVAL;
+
+	if (copy_to_user(u64_to_user_ptr(query_item->data_ptr),
+			 hwconfig->ptr, hwconfig->size))
+		return -EFAULT;
+
+	return hwconfig->size;
+}
+
 static int (* const i915_query_funcs[])(struct drm_i915_private *dev_priv,
 					struct drm_i915_query_item *query_item) = {
 	query_topology_info,
 	query_engine_info,
 	query_perf_config,
 	query_memregion_info,
+	query_hwconfig_blob,
 };
 
 int i915_query_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 05c3642aaece..071ffd9d51f1 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -2691,6 +2691,7 @@ struct drm_i915_query_item {
 #define DRM_I915_QUERY_ENGINE_INFO	2
 #define DRM_I915_QUERY_PERF_CONFIG      3
 #define DRM_I915_QUERY_MEMORY_REGIONS   4
+#define DRM_I915_QUERY_HWCONFIG_BLOB	5
 /* Must be kept compact -- no holes and well documented */
 
 	/**
-- 
2.34.1