[PATCH v2 0/4] GuC HWCONFIG with documentation

[PATCH v2 0/4] GuC HWCONFIG with documentation

[Jordan Justen]

This is John/Rodrigo's 2 patches with some minor changes, and I added
2 patches.

"drm/i915/uapi: Add query for hwconfig blob" was changed:

 * Rename DRM_I915_QUERY_HWCONFIG_TABLE to DRM_I915_QUERY_HWCONFIG_BLOB
   as requested by Joonas.

 * Reword commit message

 * I added Acked-by to this patch, but this only applies in the
   context of this version of the patchset. If my changes are
   rejected, then please *do not* add my Acked-by to the other series.

   In particular, I do not want my Acked-by on the patch if the patch
   mentions the HWCONFIG format, but is not willing to add that to the
   actual uAPI.

   I also do not want my Acked-by on it if it mentions "consolidation"
   of this data. Since we are dealing with open source projects (aside
   from GuC), this doesn't seem appropriate.

"drm/i915/uapi: Add struct drm_i915_query_hwconfig_blob_item" adds a
struct to the uAPI and documents the return value for
DRM_I915_QUERY_HWCONFIG_BLOB. (Except, keys / values are still
deferred to the PRM.)

"drm/i915/guc: Verify hwconfig blob matches supported format" does the
simple verification of the blob to make sure it matches what the uAPI
documents.

v2:
 * Fix -Werror errors.
 * Rebase to drm-intel/for-linux-next instead of
   drm-intel/for-linux-next-gt, as this seems to be what CI wants.
 * Fix u32 -> __u32. (Sorry, I was first testing in Mesa tree.)
 * Add commit message for "Verify hwconfig blob" patch as requested by
   Tvrtko.
 * Reword text added to i915_drm.h as requested by Tvrtko. (Attempting
   to indicate the overall blob ends right at the last blob item.)

John Harrison (1):
  drm/i915/guc: Add fetch of hwconfig table

Jordan Justen (2):
  drm/i915/uapi: Add struct drm_i915_query_hwconfig_blob_item
  drm/i915/guc: Verify hwconfig blob matches supported format

Rodrigo Vivi (1):
  drm/i915/uapi: Add query for hwconfig blob

 drivers/gpu/drm/i915/Makefile                 |   1 +
 .../gpu/drm/i915/gt/uc/abi/guc_actions_abi.h  |   1 +
 .../gpu/drm/i915/gt/uc/abi/guc_errors_abi.h   |   4 +
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |   3 +
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c   | 180 ++++++++++++++++++
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.h   |  19 ++
 drivers/gpu/drm/i915/gt/uc/intel_uc.c         |   6 +
 drivers/gpu/drm/i915/i915_query.c             |  23 +++
 include/uapi/drm/i915_drm.h                   |  31 +++
 9 files changed, 268 insertions(+)
 create mode 100644 drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
 create mode 100644 drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.h

-- 
2.34.1

[PATCH v2 1/4] drm/i915/guc: Add fetch of hwconfig table

[Jordan Justen]

From: John Harrison <John.C.Harrison@Intel.com>

Implement support for fetching the hardware description table from the
GuC. The call is made twice - once without a destination buffer to
query the size and then a second time to fill in the buffer.

Note that the table is only available on ADL-P and later platforms.

Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/i915/Makefile                 |   1 +
 .../gpu/drm/i915/gt/uc/abi/guc_actions_abi.h  |   1 +
 .../gpu/drm/i915/gt/uc/abi/guc_errors_abi.h   |   4 +
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |   3 +
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c   | 151 ++++++++++++++++++
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.h   |  19 +++
 drivers/gpu/drm/i915/gt/uc/intel_uc.c         |   6 +
 7 files changed, 185 insertions(+)
 create mode 100644 drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
 create mode 100644 drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.h

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 6836b020a5be..ba9b6557d59d 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -192,6 +192,7 @@ i915-y += gt/uc/intel_uc.o \
 	  gt/uc/intel_guc_rc.o \
 	  gt/uc/intel_guc_slpc.o \
 	  gt/uc/intel_guc_submission.o \
+	  gt/uc/intel_guc_hwconfig.o \
 	  gt/uc/intel_huc.o \
 	  gt/uc/intel_huc_debugfs.o \
 	  gt/uc/intel_huc_fw.o
diff --git a/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h b/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
index fe5d7d261797..4a61c819f32b 100644
--- a/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
+++ b/drivers/gpu/drm/i915/gt/uc/abi/guc_actions_abi.h
@@ -137,6 +137,7 @@ enum intel_guc_action {
 	INTEL_GUC_ACTION_ENGINE_FAILURE_NOTIFICATION = 0x1009,
 	INTEL_GUC_ACTION_SETUP_PC_GUCRC = 0x3004,
 	INTEL_GUC_ACTION_AUTHENTICATE_HUC = 0x4000,
+	INTEL_GUC_ACTION_GET_HWCONFIG = 0x4100,
 	INTEL_GUC_ACTION_REGISTER_CONTEXT = 0x4502,
 	INTEL_GUC_ACTION_DEREGISTER_CONTEXT = 0x4503,
 	INTEL_GUC_ACTION_REGISTER_COMMAND_TRANSPORT_BUFFER = 0x4505,
diff --git a/drivers/gpu/drm/i915/gt/uc/abi/guc_errors_abi.h b/drivers/gpu/drm/i915/gt/uc/abi/guc_errors_abi.h
index 488b6061ee89..f9e2a6aaef4a 100644
--- a/drivers/gpu/drm/i915/gt/uc/abi/guc_errors_abi.h
+++ b/drivers/gpu/drm/i915/gt/uc/abi/guc_errors_abi.h
@@ -8,6 +8,10 @@
 
 enum intel_guc_response_status {
 	INTEL_GUC_RESPONSE_STATUS_SUCCESS = 0x0,
+	INTEL_GUC_RESPONSE_NOT_SUPPORTED = 0x20,
+	INTEL_GUC_RESPONSE_NO_ATTRIBUTE_TABLE = 0x201,
+	INTEL_GUC_RESPONSE_NO_DECRYPTION_KEY = 0x202,
+	INTEL_GUC_RESPONSE_DECRYPTION_FAILED = 0x204,
 	INTEL_GUC_RESPONSE_STATUS_GENERIC_FAIL = 0xF000,
 };
 
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index f9240d4baa69..ce2ff4bb0fd5 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
@@ -13,6 +13,7 @@
 #include "intel_guc_fw.h"
 #include "intel_guc_fwif.h"
 #include "intel_guc_ct.h"
+#include "intel_guc_hwconfig.h"
 #include "intel_guc_log.h"
 #include "intel_guc_reg.h"
 #include "intel_guc_slpc_types.h"
@@ -37,6 +38,8 @@ struct intel_guc {
 	struct intel_guc_ct ct;
 	/** @slpc: sub-structure containing SLPC related data and objects */
 	struct intel_guc_slpc slpc;
+	/** @hwconfig: hardware configuration KLV table */
+	struct intel_guc_hwconfig hwconfig;
 
 	/** @sched_engine: Global engine used to submit requests to GuC */
 	struct i915_sched_engine *sched_engine;
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
new file mode 100644
index 000000000000..ce6088f112d4
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+
+#include "gt/intel_gt.h"
+#include "i915_drv.h"
+#include "i915_memcpy.h"
+#include "intel_guc_hwconfig.h"
+
+static inline struct intel_guc *hwconfig_to_guc(struct intel_guc_hwconfig *hwconfig)
+{
+	return container_of(hwconfig, struct intel_guc, hwconfig);
+}
+
+/*
+ * GuC has a blob containing hardware configuration information (HWConfig).
+ * This is formatted as a simple and flexible KLV (Key/Length/Value) table.
+ *
+ * For example, a minimal version could be:
+ *   enum device_attr {
+ *     ATTR_SOME_VALUE = 0,
+ *     ATTR_SOME_MASK  = 1,
+ *   };
+ *
+ *   static const u32 hwconfig[] = {
+ *     ATTR_SOME_VALUE,
+ *     1,		// Value Length in DWords
+ *     8,		// Value
+ *
+ *     ATTR_SOME_MASK,
+ *     3,
+ *     0x00FFFFFFFF, 0xFFFFFFFF, 0xFF000000,
+ *   };
+ *
+ * The attribute ids are defined in a hardware spec.
+ */
+
+static int __guc_action_get_hwconfig(struct intel_guc_hwconfig *hwconfig,
+				     u32 ggtt_offset, u32 ggtt_size)
+{
+	struct intel_guc *guc = hwconfig_to_guc(hwconfig);
+	u32 action[] = {
+		INTEL_GUC_ACTION_GET_HWCONFIG,
+		ggtt_offset,
+		0, /* upper 32 bits of address */
+		ggtt_size,
+	};
+	int ret;
+
+	ret = intel_guc_send_mmio(guc, action, ARRAY_SIZE(action), NULL, 0);
+	if (ret == -ENXIO)
+		return -ENOENT;
+
+	if (!ggtt_size && !ret)
+		ret = -EINVAL;
+
+	return ret;
+}
+
+static int guc_hwconfig_discover_size(struct intel_guc_hwconfig *hwconfig)
+{
+	int ret;
+
+	/* Sending a query with too small a table will return the size of the table */
+	ret = __guc_action_get_hwconfig(hwconfig, 0, 0);
+	if (ret < 0)
+		return ret;
+
+	hwconfig->size = ret;
+	return 0;
+}
+
+static int guc_hwconfig_fill_buffer(struct intel_guc_hwconfig *hwconfig)
+{
+	struct intel_guc *guc = hwconfig_to_guc(hwconfig);
+	struct i915_vma *vma;
+	u32 ggtt_offset;
+	void *vaddr;
+	int ret;
+
+	GEM_BUG_ON(!hwconfig->size);
+
+	ret = intel_guc_allocate_and_map_vma(guc, hwconfig->size, &vma, &vaddr);
+	if (ret)
+		return ret;
+
+	ggtt_offset = intel_guc_ggtt_offset(guc, vma);
+
+	ret = __guc_action_get_hwconfig(hwconfig, ggtt_offset, hwconfig->size);
+	if (ret >= 0)
+		memcpy(hwconfig->ptr, vaddr, hwconfig->size);
+
+	i915_vma_unpin_and_release(&vma, I915_VMA_RELEASE_MAP);
+
+	return ret;
+}
+
+static bool has_table(struct drm_i915_private *i915)
+{
+	if (IS_ALDERLAKE_P(i915))
+		return true;
+
+	return false;
+}
+
+/**
+ * intel_guc_hwconfig_fini - Finalize the HWConfig
+ *
+ * Free up the memory allocation holding the table.
+ */
+void intel_guc_hwconfig_fini(struct intel_guc_hwconfig *hwconfig)
+{
+	kfree(hwconfig->ptr);
+	hwconfig->size = 0;
+	hwconfig->ptr = NULL;
+}
+
+/**
+ * intel_guc_hwconfig_init - Initialize the HWConfig
+ *
+ * Retrieve the HWConfig table from the GuC and save it away in a local memory
+ * allocation. It can then be queried on demand by other users later on.
+ */
+int intel_guc_hwconfig_init(struct intel_guc_hwconfig *hwconfig)
+{
+	struct intel_guc *guc = hwconfig_to_guc(hwconfig);
+	struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
+	int ret;
+
+	if (!has_table(i915))
+		return 0;
+
+	ret = guc_hwconfig_discover_size(hwconfig);
+	if (ret)
+		return ret;
+
+	hwconfig->ptr = kmalloc(hwconfig->size, GFP_KERNEL);
+	if (!hwconfig->ptr) {
+		hwconfig->size = 0;
+		return -ENOMEM;
+	}
+
+	ret = guc_hwconfig_fill_buffer(hwconfig);
+	if (ret < 0) {
+		intel_guc_hwconfig_fini(hwconfig);
+		return ret;
+	}
+
+	return 0;
+}
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.h
new file mode 100644
index 000000000000..fdd7f0d6e938
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+
+#ifndef _INTEL_GUC_HWCONFIG_H_
+#define _INTEL_GUC_HWCONFIG_H_
+
+#include <linux/types.h>
+
+struct intel_guc_hwconfig {
+	u32 size;
+	void *ptr;
+};
+
+int intel_guc_hwconfig_init(struct intel_guc_hwconfig *hwconfig);
+void intel_guc_hwconfig_fini(struct intel_guc_hwconfig *hwconfig);
+
+#endif /* _INTEL_GUC_HWCONFIG_H_ */
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
index 09ed29df67bc..d045ff6d4d63 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
@@ -489,6 +489,10 @@ static int __uc_init_hw(struct intel_uc *uc)
 	if (ret)
 		goto err_log_capture;
 
+	ret = intel_guc_hwconfig_init(&guc->hwconfig);
+	if (ret)
+		drm_err(&i915->drm, "Failed to retrieve hwconfig table: %d\n", ret);
+
 	ret = guc_enable_communication(guc);
 	if (ret)
 		goto err_log_capture;
@@ -562,6 +566,8 @@ static void __uc_fini_hw(struct intel_uc *uc)
 	if (intel_uc_uses_guc_submission(uc))
 		intel_guc_submission_disable(guc);
 
+	intel_guc_hwconfig_fini(&guc->hwconfig);
+
 	__uc_sanitize(uc);
 }
 
-- 
2.34.1

[PATCH v2 2/4] drm/i915/uapi: Add query for hwconfig blob

[Jordan Justen]

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

The DRM_I915_QUERY_HWCONFIG_BLOB query item returns a blob of data
which it receives from the GuC software. This blob provides some
useful data about the hardware for drivers.

Although the blob is not fully documented at this time, the basic
format is an array of u32 values. The array is a simple and flexible
KLV (Key/Length/Value) formatted table. For example, it could be just:
enum device_attr { ATTR_SOME_VALUE = 0, ATTR_SOME_MASK = 1, };

  static const u32 hwconfig[] = {
      ATTR_SOME_VALUE,
      1,             // Value Length in DWords
      8,             // Value

      ATTR_SOME_MASK,
      3,
      0x00FFFFFFFF, 0xFFFFFFFF, 0xFF000000,
  };

The attribute ids and meaning of the values will be documented in the
Programmer Reference Manuals when released.

Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Kenneth Graunke <kenneth.w.graunke@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Slawomir Milczarek <slawomir.milczarek@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Acked-by: Jordan Justen <jordan.l.justen@intel.com>
Tested-by: Jordan Justen <jordan.l.justen@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..195524e9a369 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_guc_hwconfig *hwconfig = &gt->uc.guc.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 914ebd9290e5..069d2fadfbd9 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -2685,6 +2685,7 @@ 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

[PATCH v2 3/4] drm/i915/uapi: Add struct drm_i915_query_hwconfig_blob_item

[Jordan Justen]

Also, document DRM_I915_QUERY_HWCONFIG_BLOB with this struct.

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
---
 include/uapi/drm/i915_drm.h | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 069d2fadfbd9..280e7e2e04d8 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -3276,6 +3276,36 @@ struct drm_i915_gem_create_ext_protected_content {
 	__u32 flags;
 };
 
+/**
+ * DOC: GuC HWCONFIG blob uAPI
+ *
+ * The GuC produces a blob with information about the current device.
+ * i915 reads this blob from GuC and makes it available via this uAPI.
+ *
+ * The returned blob is an sequence of items of variable length
+ * described by struct drm_i915_query_hwconfig_blob_item. The
+ * drm_i915_query_hwconfig_blob_item length field gives the length of
+ * the drm_i915_query_hwconfig_blob_item data[] array for the item and
+ * thereby determines the length of that item.
+ *
+ * The overall blob returned by DRM_I915_QUERY_HWCONFIG_BLOB will end
+ * at the same location as the end of the final
+ * drm_i915_query_hwconfig_blob_item. In other words, walking through
+ * the individual items is guaranteed to eventually arrive at the
+ * exact end of the entire blob.
+ *
+ * The meaning of the key field and the data values are documented in
+ * the Programmer's Reference Manual.
+ */
+struct drm_i915_query_hwconfig_blob_item {
+	/** @key: Enum which defines how to interpret @data values. */
+	__u32 key;
+	/** @length: Length of the @data array. */
+	__u32 length;
+	/** @key: Array of values with meaning defined by @key */
+	__u32 data[];
+};
+
 /* ID of the protected content session managed by i915 when PXP is active */
 #define I915_PROTECTED_CONTENT_DEFAULT_SESSION 0xf
 
-- 
2.34.1

[PATCH v2 4/4] drm/i915/guc: Verify hwconfig blob matches supported format

[Jordan Justen]

i915_drm.h now defines the format of the returned
DRM_I915_QUERY_HWCONFIG_BLOB query item. Since i915 receives this from
the black box GuC software, it should verify that the data matches
that format before sending it to user-space.

The verification makes a single simple pass through the blob contents,
so this verification step should not add a significant amount of init
time to i915.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
---
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c   | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
index ce6088f112d4..6208246d4209 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
@@ -71,6 +71,29 @@ static int guc_hwconfig_discover_size(struct intel_guc_hwconfig *hwconfig)
 	return 0;
 }
 
+static int verify_hwconfig_blob(const struct intel_guc_hwconfig *hwconfig)
+{
+	struct drm_i915_query_hwconfig_blob_item *pos;
+	u32 remaining;
+
+	if (hwconfig->size % 4 != 0 || hwconfig->ptr == NULL)
+		return -EINVAL;
+
+	pos = hwconfig->ptr;
+	remaining = (hwconfig->size / 4);
+	while (remaining > 0) {
+		if (remaining < 2)
+			return -EINVAL;
+		if (pos->length > remaining - 2)
+			return -EINVAL;
+		remaining -= 2 + pos->length;
+		pos = (void *)&pos->data[pos->length];
+	}
+
+	DRM_INFO("hwconfig blob format appears valid\n");
+	return 0;
+}
+
 static int guc_hwconfig_fill_buffer(struct intel_guc_hwconfig *hwconfig)
 {
 	struct intel_guc *guc = hwconfig_to_guc(hwconfig);
@@ -91,6 +114,12 @@ static int guc_hwconfig_fill_buffer(struct intel_guc_hwconfig *hwconfig)
 	if (ret >= 0)
 		memcpy(hwconfig->ptr, vaddr, hwconfig->size);
 
+	if (verify_hwconfig_blob(hwconfig)) {
+		DRM_ERROR("Ignoring invalid hwconfig blob received from "
+			  "GuC!\n");
+		return -EINVAL;
+	}
+
 	i915_vma_unpin_and_release(&vma, I915_VMA_RELEASE_MAP);
 
 	return ret;
-- 
2.34.1