[PATCH 0/2] Add support for querying hw info that UMDs need

[PATCH 0/2] Add support for querying hw info that UMDs need

[John.C.Harrison]

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

Various UMDs require hardware configuration information about the
current platform. A bunch of static information is available in a
fixed table that can be retrieved from the GuC.

Test-with: 20210727002812.43469-2-John.C.Harrison@Intel.com
UMD: https://github.com/intel/compute-runtime/pull/432/files
UMD: https://github.com/intel/media-driver/pull/1239/files

CC: Katarzyna Cencelewska <katarzyna.cencelewska@intel.com>
CC: Tony Ye <tony.ye@intel.com>
CC: Jason Ekstrand <jason.ekstrand@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>


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

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

 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.c        |   3 +-
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |   2 +
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c   | 156 ++++++++++++++++++
 .../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                   |   1 +
 10 files changed, 215 insertions(+), 1 deletion(-)
 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

-- 
2.25.1

[Intel-gfx] [PATCH 0/2] Add support for querying hw info that UMDs need

[John.C.Harrison]

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

Various UMDs require hardware configuration information about the
current platform. A bunch of static information is available in a
fixed table that can be retrieved from the GuC.

Test-with: 20210727002812.43469-2-John.C.Harrison@Intel.com
UMD: https://github.com/intel/compute-runtime/pull/432/files
UMD: https://github.com/intel/media-driver/pull/1239/files

CC: Katarzyna Cencelewska <katarzyna.cencelewska@intel.com>
CC: Tony Ye <tony.ye@intel.com>
CC: Jason Ekstrand <jason.ekstrand@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>


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

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

 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.c        |   3 +-
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |   2 +
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c   | 156 ++++++++++++++++++
 .../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                   |   1 +
 10 files changed, 215 insertions(+), 1 deletion(-)
 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

-- 
2.25.1

[PATCH 1/2] drm/i915/guc: Add fetch of hwconfig table

[John.C.Harrison]

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>
---
 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.c        |   3 +-
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |   2 +
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c   | 156 ++++++++++++++++++
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.h   |  19 +++
 drivers/gpu/drm/i915/gt/uc/intel_uc.c         |   6 +
 8 files changed, 191 insertions(+), 1 deletion(-)
 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 c01518f86c5f..68bc90ff873b 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -191,6 +191,7 @@ 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 8ff582222aff..72fd492b726a 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.c b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
index fbfcae727d7f..82c0ce0090c6 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
@@ -422,13 +422,14 @@ int intel_guc_send_mmio(struct intel_guc *guc, const u32 *request, u32 len,
 	/*
 	 * No GuC command should ever take longer than 10ms.
 	 * Fast commands should still complete in 10us.
+	 * Except for the hwconfig table query, which takes ~50ms.
 	 */
 	ret = __intel_wait_for_register_fw(uncore,
 					   guc_send_reg(guc, 0),
 					   GUC_HXG_MSG_0_ORIGIN,
 					   FIELD_PREP(GUC_HXG_MSG_0_ORIGIN,
 						      GUC_HXG_ORIGIN_GUC),
-					   10, 10, &header);
+					   10, 100, &header);
 	if (unlikely(ret)) {
 timeout:
 		drm_err(&i915->drm, "mmio request %#x: no reply %x\n",
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 2e27fe59786b..66c00033fea1 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"
@@ -32,6 +33,7 @@ struct intel_guc {
 	struct intel_guc_log log;
 	struct intel_guc_ct ct;
 	struct intel_guc_slpc slpc;
+	struct intel_guc_hwconfig hwconfig;
 
 	/* 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..af4fc9fdbaaf
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
@@ -0,0 +1,156 @@
+// 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);
+	struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
+	u32 action[] = {
+		INTEL_GUC_ACTION_GET_HWCONFIG,
+		ggtt_offset,
+		ggtt_size,
+		(INTEL_DEVID(i915) << 16) | INTEL_REVID(i915),
+	};
+	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)) {
+		if (IS_ADLP_GT_STEP(i915, STEP_A0, STEP_A0))
+			return false;
+
+		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 b104fb7607eb..f8b2c051948d 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
@@ -491,6 +491,10 @@ 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;
@@ -558,6 +562,8 @@ 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);
 }
 
-- 
2.25.1

[Intel-gfx] [PATCH 1/2] drm/i915/guc: Add fetch of hwconfig table

[John.C.Harrison]

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>
---
 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.c        |   3 +-
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |   2 +
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c   | 156 ++++++++++++++++++
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.h   |  19 +++
 drivers/gpu/drm/i915/gt/uc/intel_uc.c         |   6 +
 8 files changed, 191 insertions(+), 1 deletion(-)
 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 c01518f86c5f..68bc90ff873b 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -191,6 +191,7 @@ 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 8ff582222aff..72fd492b726a 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.c b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
index fbfcae727d7f..82c0ce0090c6 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
@@ -422,13 +422,14 @@ int intel_guc_send_mmio(struct intel_guc *guc, const u32 *request, u32 len,
 	/*
 	 * No GuC command should ever take longer than 10ms.
 	 * Fast commands should still complete in 10us.
+	 * Except for the hwconfig table query, which takes ~50ms.
 	 */
 	ret = __intel_wait_for_register_fw(uncore,
 					   guc_send_reg(guc, 0),
 					   GUC_HXG_MSG_0_ORIGIN,
 					   FIELD_PREP(GUC_HXG_MSG_0_ORIGIN,
 						      GUC_HXG_ORIGIN_GUC),
-					   10, 10, &header);
+					   10, 100, &header);
 	if (unlikely(ret)) {
 timeout:
 		drm_err(&i915->drm, "mmio request %#x: no reply %x\n",
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 2e27fe59786b..66c00033fea1 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"
@@ -32,6 +33,7 @@ struct intel_guc {
 	struct intel_guc_log log;
 	struct intel_guc_ct ct;
 	struct intel_guc_slpc slpc;
+	struct intel_guc_hwconfig hwconfig;
 
 	/* 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..af4fc9fdbaaf
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
@@ -0,0 +1,156 @@
+// 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);
+	struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
+	u32 action[] = {
+		INTEL_GUC_ACTION_GET_HWCONFIG,
+		ggtt_offset,
+		ggtt_size,
+		(INTEL_DEVID(i915) << 16) | INTEL_REVID(i915),
+	};
+	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)) {
+		if (IS_ADLP_GT_STEP(i915, STEP_A0, STEP_A0))
+			return false;
+
+		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 b104fb7607eb..f8b2c051948d 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
@@ -491,6 +491,10 @@ 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;
@@ -558,6 +562,8 @@ 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);
 }
 
-- 
2.25.1

Re: [PATCH 1/2] drm/i915/guc: Add fetch of hwconfig table

[Matthew Brost]

On Thu, Sep 02, 2021 at 05:53:32PM -0700, John.C.Harrison@Intel.com wrote:
> 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.c        |   3 +-
>  drivers/gpu/drm/i915/gt/uc/intel_guc.h        |   2 +
>  .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c   | 156 ++++++++++++++++++
>  .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.h   |  19 +++
>  drivers/gpu/drm/i915/gt/uc/intel_uc.c         |   6 +
>  8 files changed, 191 insertions(+), 1 deletion(-)
>  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 c01518f86c5f..68bc90ff873b 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -191,6 +191,7 @@ 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 8ff582222aff..72fd492b726a 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.c b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
> index fbfcae727d7f..82c0ce0090c6 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
> @@ -422,13 +422,14 @@ int intel_guc_send_mmio(struct intel_guc *guc, const u32 *request, u32 len,
>  	/*
>  	 * No GuC command should ever take longer than 10ms.
>  	 * Fast commands should still complete in 10us.
> +	 * Except for the hwconfig table query, which takes ~50ms.
>  	 */
>  	ret = __intel_wait_for_register_fw(uncore,
>  					   guc_send_reg(guc, 0),
>  					   GUC_HXG_MSG_0_ORIGIN,
>  					   FIELD_PREP(GUC_HXG_MSG_0_ORIGIN,
>  						      GUC_HXG_ORIGIN_GUC),
> -					   10, 10, &header);
> +					   10, 100, &header);
>  	if (unlikely(ret)) {
>  timeout:
>  		drm_err(&i915->drm, "mmio request %#x: no reply %x\n",
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> index 2e27fe59786b..66c00033fea1 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"
> @@ -32,6 +33,7 @@ struct intel_guc {
>  	struct intel_guc_log log;
>  	struct intel_guc_ct ct;
>  	struct intel_guc_slpc slpc;
> +	struct intel_guc_hwconfig hwconfig;
>  
>  	/* 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..af4fc9fdbaaf
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
> @@ -0,0 +1,156 @@
> +// 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);
> +	struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
> +	u32 action[] = {
> +		INTEL_GUC_ACTION_GET_HWCONFIG,
> +		ggtt_offset,
> +		ggtt_size,
> +		(INTEL_DEVID(i915) << 16) | INTEL_REVID(i915),
> +	};
> +	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)) {
> +		if (IS_ADLP_GT_STEP(i915, STEP_A0, STEP_A0))
> +			return false;
> +
> +		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 b104fb7607eb..f8b2c051948d 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
> @@ -491,6 +491,10 @@ 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;
> @@ -558,6 +562,8 @@ 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);
>  }
>  
> -- 
> 2.25.1
> 

Re: [Intel-gfx] [PATCH 1/2] drm/i915/guc: Add fetch of hwconfig table

[Matthew Brost]

On Thu, Sep 02, 2021 at 05:53:32PM -0700, John.C.Harrison@Intel.com wrote:
> 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.c        |   3 +-
>  drivers/gpu/drm/i915/gt/uc/intel_guc.h        |   2 +
>  .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c   | 156 ++++++++++++++++++
>  .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.h   |  19 +++
>  drivers/gpu/drm/i915/gt/uc/intel_uc.c         |   6 +
>  8 files changed, 191 insertions(+), 1 deletion(-)
>  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 c01518f86c5f..68bc90ff873b 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -191,6 +191,7 @@ 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 8ff582222aff..72fd492b726a 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.c b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
> index fbfcae727d7f..82c0ce0090c6 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
> @@ -422,13 +422,14 @@ int intel_guc_send_mmio(struct intel_guc *guc, const u32 *request, u32 len,
>  	/*
>  	 * No GuC command should ever take longer than 10ms.
>  	 * Fast commands should still complete in 10us.
> +	 * Except for the hwconfig table query, which takes ~50ms.
>  	 */
>  	ret = __intel_wait_for_register_fw(uncore,
>  					   guc_send_reg(guc, 0),
>  					   GUC_HXG_MSG_0_ORIGIN,
>  					   FIELD_PREP(GUC_HXG_MSG_0_ORIGIN,
>  						      GUC_HXG_ORIGIN_GUC),
> -					   10, 10, &header);
> +					   10, 100, &header);
>  	if (unlikely(ret)) {
>  timeout:
>  		drm_err(&i915->drm, "mmio request %#x: no reply %x\n",
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> index 2e27fe59786b..66c00033fea1 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"
> @@ -32,6 +33,7 @@ struct intel_guc {
>  	struct intel_guc_log log;
>  	struct intel_guc_ct ct;
>  	struct intel_guc_slpc slpc;
> +	struct intel_guc_hwconfig hwconfig;
>  
>  	/* 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..af4fc9fdbaaf
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
> @@ -0,0 +1,156 @@
> +// 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);
> +	struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
> +	u32 action[] = {
> +		INTEL_GUC_ACTION_GET_HWCONFIG,
> +		ggtt_offset,
> +		ggtt_size,
> +		(INTEL_DEVID(i915) << 16) | INTEL_REVID(i915),
> +	};
> +	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)) {
> +		if (IS_ADLP_GT_STEP(i915, STEP_A0, STEP_A0))
> +			return false;
> +
> +		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 b104fb7607eb..f8b2c051948d 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
> @@ -491,6 +491,10 @@ 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;
> @@ -558,6 +562,8 @@ 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);
>  }
>  
> -- 
> 2.25.1
> 

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

[John.C.Harrison]

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

GuC contains a consolidated table with a bunch of information about the
current device.

Previously, this information was spread and hardcoded to all the components
including GuC, i915 and various UMDs. The goal here is to consolidate
the data into GuC in a way that all interested components can grab the
very latest and synchronized information using a simple query.

As per most of the other queries, this one can be called twice.
Once with item.length=0 to determine the exact buffer size, then
allocate the user memory and call it again for to retrieve the
table data. For example:
  struct drm_i915_query_item item = {
    .query_id = DRM_I915_QUERY_HWCONCFIG_TABLE;
  };
  query.items_ptr = (int64_t) &item;
  query.num_items = 1;

  ioctl(fd, DRM_IOCTL_I915_QUERY, query, sizeof(query));

  if (item.length <= 0)
    return -ENOENT;

  data = malloc(item.length);
  item.data_ptr = (int64_t) &data;
  ioctl(fd, DRM_IOCTL_I915_QUERY, query, sizeof(query));

  // Parse the data as appropriate...

The returned 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 are defined in a hardware spec.

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>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@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 5e2b909827f4..96989a37453c 100644
--- a/drivers/gpu/drm/i915/i915_query.c
+++ b/drivers/gpu/drm/i915/i915_query.c
@@ -477,12 +477,35 @@ static int query_memregion_info(struct drm_i915_private *i915,
 	return total_length;
 }
 
+static int query_hwconfig_table(struct drm_i915_private *i915,
+				struct drm_i915_query_item *query_item)
+{
+	struct intel_gt *gt = &i915->gt;
+	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_table,
 };
 
 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 bde5860b3686..a1281f35b190 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -2499,6 +2499,7 @@ 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_TABLE   5
 /* Must be kept compact -- no holes and well documented */
 
 	/**
-- 
2.25.1

[Intel-gfx] [PATCH 2/2] drm/i915/uapi: Add query for hwconfig table

[John.C.Harrison]

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

GuC contains a consolidated table with a bunch of information about the
current device.

Previously, this information was spread and hardcoded to all the components
including GuC, i915 and various UMDs. The goal here is to consolidate
the data into GuC in a way that all interested components can grab the
very latest and synchronized information using a simple query.

As per most of the other queries, this one can be called twice.
Once with item.length=0 to determine the exact buffer size, then
allocate the user memory and call it again for to retrieve the
table data. For example:
  struct drm_i915_query_item item = {
    .query_id = DRM_I915_QUERY_HWCONCFIG_TABLE;
  };
  query.items_ptr = (int64_t) &item;
  query.num_items = 1;

  ioctl(fd, DRM_IOCTL_I915_QUERY, query, sizeof(query));

  if (item.length <= 0)
    return -ENOENT;

  data = malloc(item.length);
  item.data_ptr = (int64_t) &data;
  ioctl(fd, DRM_IOCTL_I915_QUERY, query, sizeof(query));

  // Parse the data as appropriate...

The returned 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 are defined in a hardware spec.

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>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@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 5e2b909827f4..96989a37453c 100644
--- a/drivers/gpu/drm/i915/i915_query.c
+++ b/drivers/gpu/drm/i915/i915_query.c
@@ -477,12 +477,35 @@ static int query_memregion_info(struct drm_i915_private *i915,
 	return total_length;
 }
 
+static int query_hwconfig_table(struct drm_i915_private *i915,
+				struct drm_i915_query_item *query_item)
+{
+	struct intel_gt *gt = &i915->gt;
+	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_table,
 };
 
 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 bde5860b3686..a1281f35b190 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -2499,6 +2499,7 @@ 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_TABLE   5
 /* Must be kept compact -- no holes and well documented */
 
 	/**
-- 
2.25.1

Re: [PATCH 2/2] drm/i915/uapi: Add query for hwconfig table

[Matthew Brost]

On Thu, Sep 02, 2021 at 05:53:33PM -0700, John.C.Harrison@Intel.com wrote:
> From: Rodrigo Vivi <rodrigo.vivi@intel.com>
> 
> GuC contains a consolidated table with a bunch of information about the
> current device.
> 
> Previously, this information was spread and hardcoded to all the components
> including GuC, i915 and various UMDs. The goal here is to consolidate
> the data into GuC in a way that all interested components can grab the
> very latest and synchronized information using a simple query.
> 
> As per most of the other queries, this one can be called twice.
> Once with item.length=0 to determine the exact buffer size, then
> allocate the user memory and call it again for to retrieve the
> table data. For example:
>   struct drm_i915_query_item item = {
>     .query_id = DRM_I915_QUERY_HWCONCFIG_TABLE;
>   };
>   query.items_ptr = (int64_t) &item;
>   query.num_items = 1;
> 
>   ioctl(fd, DRM_IOCTL_I915_QUERY, query, sizeof(query));
> 
>   if (item.length <= 0)
>     return -ENOENT;
> 
>   data = malloc(item.length);
>   item.data_ptr = (int64_t) &data;
>   ioctl(fd, DRM_IOCTL_I915_QUERY, query, sizeof(query));
> 
>   // Parse the data as appropriate...
> 
> The returned 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 are defined in a hardware spec.
> 
> 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>
> 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/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 5e2b909827f4..96989a37453c 100644
> --- a/drivers/gpu/drm/i915/i915_query.c
> +++ b/drivers/gpu/drm/i915/i915_query.c
> @@ -477,12 +477,35 @@ static int query_memregion_info(struct drm_i915_private *i915,
>  	return total_length;
>  }
>  
> +static int query_hwconfig_table(struct drm_i915_private *i915,
> +				struct drm_i915_query_item *query_item)
> +{
> +	struct intel_gt *gt = &i915->gt;
> +	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_table,
>  };
>  
>  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 bde5860b3686..a1281f35b190 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -2499,6 +2499,7 @@ 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_TABLE   5
>  /* Must be kept compact -- no holes and well documented */
>  
>  	/**
> -- 
> 2.25.1
> 

Re: [Intel-gfx] [PATCH 2/2] drm/i915/uapi: Add query for hwconfig table

[Matthew Brost]

On Thu, Sep 02, 2021 at 05:53:33PM -0700, John.C.Harrison@Intel.com wrote:
> From: Rodrigo Vivi <rodrigo.vivi@intel.com>
> 
> GuC contains a consolidated table with a bunch of information about the
> current device.
> 
> Previously, this information was spread and hardcoded to all the components
> including GuC, i915 and various UMDs. The goal here is to consolidate
> the data into GuC in a way that all interested components can grab the
> very latest and synchronized information using a simple query.
> 
> As per most of the other queries, this one can be called twice.
> Once with item.length=0 to determine the exact buffer size, then
> allocate the user memory and call it again for to retrieve the
> table data. For example:
>   struct drm_i915_query_item item = {
>     .query_id = DRM_I915_QUERY_HWCONCFIG_TABLE;
>   };
>   query.items_ptr = (int64_t) &item;
>   query.num_items = 1;
> 
>   ioctl(fd, DRM_IOCTL_I915_QUERY, query, sizeof(query));
> 
>   if (item.length <= 0)
>     return -ENOENT;
> 
>   data = malloc(item.length);
>   item.data_ptr = (int64_t) &data;
>   ioctl(fd, DRM_IOCTL_I915_QUERY, query, sizeof(query));
> 
>   // Parse the data as appropriate...
> 
> The returned 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 are defined in a hardware spec.
> 
> 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>
> 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/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 5e2b909827f4..96989a37453c 100644
> --- a/drivers/gpu/drm/i915/i915_query.c
> +++ b/drivers/gpu/drm/i915/i915_query.c
> @@ -477,12 +477,35 @@ static int query_memregion_info(struct drm_i915_private *i915,
>  	return total_length;
>  }
>  
> +static int query_hwconfig_table(struct drm_i915_private *i915,
> +				struct drm_i915_query_item *query_item)
> +{
> +	struct intel_gt *gt = &i915->gt;
> +	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_table,
>  };
>  
>  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 bde5860b3686..a1281f35b190 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -2499,6 +2499,7 @@ 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_TABLE   5
>  /* Must be kept compact -- no holes and well documented */
>  
>  	/**
> -- 
> 2.25.1
> 

[Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for Add support for querying hw info that UMDs need

[Patchwork]

== Series Details ==

Series: Add support for querying hw info that UMDs need
URL   : https://patchwork.freedesktop.org/series/94305/
State : warning

== Summary ==

$ dim checkpatch origin/drm-tip
89c0a2e861c5 drm/i915/guc: Add fetch of hwconfig table
-:96: WARNING:FILE_PATH_CHANGES: added, moved or deleted file(s), does MAINTAINERS need updating?
#96: 
new file mode 100644

total: 0 errors, 1 warnings, 0 checks, 246 lines checked
59cd6e0ca31d drm/i915/uapi: Add query for hwconfig table

[Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for Add support for querying hw info that UMDs need (rev2)

[Patchwork]

== Series Details ==

Series: Add support for querying hw info that UMDs need (rev2)
URL   : https://patchwork.freedesktop.org/series/94305/
State : warning

== Summary ==

$ dim checkpatch origin/drm-tip
635d7bee7010 drm/i915/guc: Add fetch of hwconfig table
-:97: WARNING:FILE_PATH_CHANGES: added, moved or deleted file(s), does MAINTAINERS need updating?
#97: 
new file mode 100644

total: 0 errors, 1 warnings, 0 checks, 246 lines checked
a85e9aa029f2 drm/i915/uapi: Add query for hwconfig table

[Intel-gfx] ✗ Fi.CI.BUILD: failure for Add support for querying hw info that UMDs need (rev3)

[Patchwork]

== Series Details ==

Series: Add support for querying hw info that UMDs need (rev3)
URL   : https://patchwork.freedesktop.org/series/94305/
State : failure

== Summary ==

Applying: drm/i915/guc: Add fetch of hwconfig table
error: sha1 information is lacking or useless (drivers/gpu/drm/i915/Makefile).
error: could not build fake ancestor
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 drm/i915/guc: Add fetch of hwconfig table
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

[PATCH 0/2] Add support for querying hw info that UMDs need

[John.C.Harrison]

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

Various UMDs require hardware configuration information about the
current platform. A bunch of static information is available in a
fixed table that can be retrieved from the GuC.

Test-with: 20210915215558.2473428-2-John.C.Harrison@Intel.com
UMD: https://github.com/intel/compute-runtime/pull/432/files
UMD: https://github.com/intel/media-driver/pull/1239/files

CC: Katarzyna Cencelewska <katarzyna.cencelewska@intel.com>
CC: Tony Ye <tony.ye@intel.com>
CC: Jason Ekstrand <jason.ekstrand@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>


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

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

 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.c        |   3 +-
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |   2 +
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c   | 156 ++++++++++++++++++
 .../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                   |   1 +
 10 files changed, 215 insertions(+), 1 deletion(-)
 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

-- 
2.25.1

[PATCH 1/2] drm/i915/guc: Add fetch of hwconfig table

[John.C.Harrison]

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.c        |   3 +-
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |   2 +
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c   | 156 ++++++++++++++++++
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.h   |  19 +++
 drivers/gpu/drm/i915/gt/uc/intel_uc.c         |   6 +
 8 files changed, 191 insertions(+), 1 deletion(-)
 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 c1e9f7369fb5..3789f03a1021 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -190,6 +190,7 @@ 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 8ff582222aff..72fd492b726a 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.c b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
index fbfcae727d7f..82c0ce0090c6 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
@@ -422,13 +422,14 @@ int intel_guc_send_mmio(struct intel_guc *guc, const u32 *request, u32 len,
 	/*
 	 * No GuC command should ever take longer than 10ms.
 	 * Fast commands should still complete in 10us.
+	 * Except for the hwconfig table query, which takes ~50ms.
 	 */
 	ret = __intel_wait_for_register_fw(uncore,
 					   guc_send_reg(guc, 0),
 					   GUC_HXG_MSG_0_ORIGIN,
 					   FIELD_PREP(GUC_HXG_MSG_0_ORIGIN,
 						      GUC_HXG_ORIGIN_GUC),
-					   10, 10, &header);
+					   10, 100, &header);
 	if (unlikely(ret)) {
 timeout:
 		drm_err(&i915->drm, "mmio request %#x: no reply %x\n",
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 5dd174babf7a..ec38a69ca3fe 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 +38,7 @@ struct intel_guc {
 	struct intel_guc_ct ct;
 	/** @slpc: sub-structure containing SLPC related data and objects */
 	struct intel_guc_slpc slpc;
+	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..af4fc9fdbaaf
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
@@ -0,0 +1,156 @@
+// 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);
+	struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
+	u32 action[] = {
+		INTEL_GUC_ACTION_GET_HWCONFIG,
+		ggtt_offset,
+		ggtt_size,
+		(INTEL_DEVID(i915) << 16) | INTEL_REVID(i915),
+	};
+	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)) {
+		if (IS_ADLP_GT_STEP(i915, STEP_A0, STEP_A0))
+			return false;
+
+		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 86c318516e14..44c4adf58609 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
@@ -486,6 +486,10 @@ 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;
@@ -553,6 +557,8 @@ 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);
 }
 
-- 
2.25.1

[PATCH 0/2] Add support for querying hw info that UMDs need

[John.C.Harrison]

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

Various UMDs require hardware configuration information about the
current platform. A bunch of static information is available in a
fixed table that can be retrieved from the GuC.

Test-with: 20210727002812.43469-2-John.C.Harrison@Intel.com
UMD: https://github.com/intel/compute-runtime/pull/432/files

Signed-off-by: John Harrison <John.C.Harrison@Intel.com>


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

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

 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.c        |   3 +-
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |   2 +
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c   | 156 ++++++++++++++++++
 .../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                   |   1 +
 10 files changed, 215 insertions(+), 1 deletion(-)
 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

-- 
2.25.1

[PATCH 1/2] drm/i915/guc: Add fetch of hwconfig table

[John.C.Harrison]

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>
---
 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.c        |   3 +-
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |   2 +
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c   | 156 ++++++++++++++++++
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.h   |  19 +++
 drivers/gpu/drm/i915/gt/uc/intel_uc.c         |   6 +
 8 files changed, 191 insertions(+), 1 deletion(-)
 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 bde3d4f462a9..bce7c597f1df 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -189,6 +189,7 @@ i915-y += gt/uc/intel_uc.o \
 	  gt/uc/intel_guc_log.o \
 	  gt/uc/intel_guc_log_debugfs.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 57e18babdf4b..a66f50e22864 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_SLPC_REQUEST = 0x3003,
 	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.c b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
index 6661dcb02239..e810b56c49f7 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
@@ -400,13 +400,14 @@ int intel_guc_send_mmio(struct intel_guc *guc, const u32 *request, u32 len,
 	/*
 	 * No GuC command should ever take longer than 10ms.
 	 * Fast commands should still complete in 10us.
+	 * Except for the hwconfig table query, which takes ~50ms.
 	 */
 	ret = __intel_wait_for_register_fw(uncore,
 					   guc_send_reg(guc, 0),
 					   GUC_HXG_MSG_0_ORIGIN,
 					   FIELD_PREP(GUC_HXG_MSG_0_ORIGIN,
 						      GUC_HXG_ORIGIN_GUC),
-					   10, 10, &header);
+					   10, 100, &header);
 	if (unlikely(ret)) {
 timeout:
 		drm_err(&i915->drm, "mmio request %#x: no reply %x\n",
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index d4987cd789ea..b4ba0fa3fbb2 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
@@ -15,6 +15,7 @@
 #include "intel_guc_ct.h"
 #include "intel_guc_log.h"
 #include "intel_guc_reg.h"
+#include "intel_guc_hwconfig.h"
 #include "intel_uc_fw.h"
 #include "i915_utils.h"
 #include "i915_vma.h"
@@ -30,6 +31,7 @@ struct intel_guc {
 	struct intel_uc_fw fw;
 	struct intel_guc_log log;
 	struct intel_guc_ct ct;
+	struct intel_guc_hwconfig hwconfig;
 
 	/* 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..af4fc9fdbaaf
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
@@ -0,0 +1,156 @@
+// 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);
+	struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
+	u32 action[] = {
+		INTEL_GUC_ACTION_GET_HWCONFIG,
+		ggtt_offset,
+		ggtt_size,
+		(INTEL_DEVID(i915) << 16) | INTEL_REVID(i915),
+	};
+	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)) {
+		if (IS_ADLP_GT_STEP(i915, STEP_A0, STEP_A0))
+			return false;
+
+		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 6d8b9233214e..6df596152937 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
@@ -496,6 +496,10 @@ 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;
@@ -552,6 +556,8 @@ 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);
 }
 
-- 
2.25.1

[PATCH 0/2] Add support for querying hw info that UMDs need

[John.C.Harrison]

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

Various UMDs require hardware configuration information about the
current platform. A bunch of static information is available in a
fixed table that can be retrieved from the GuC.

Test-with: 20210727002812.43469-2-John.C.Harrison@Intel.com
UMD: https://github.com/intel/compute-runtime/pull/432/files

Signed-off-by: John Harrison <John.C.Harrison@Intel.com>


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

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

 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.c        |   3 +-
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |   2 +
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c   | 156 ++++++++++++++++++
 .../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                   |   1 +
 10 files changed, 215 insertions(+), 1 deletion(-)
 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

-- 
2.25.1

[PATCH 1/2] drm/i915/guc: Add fetch of hwconfig table

[John.C.Harrison]

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>
---
 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.c        |   3 +-
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |   2 +
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.c   | 156 ++++++++++++++++++
 .../gpu/drm/i915/gt/uc/intel_guc_hwconfig.h   |  19 +++
 drivers/gpu/drm/i915/gt/uc/intel_uc.c         |   6 +
 8 files changed, 191 insertions(+), 1 deletion(-)
 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 bde3d4f462a9..bce7c597f1df 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -189,6 +189,7 @@ i915-y += gt/uc/intel_uc.o \
 	  gt/uc/intel_guc_log.o \
 	  gt/uc/intel_guc_log_debugfs.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 2d6198e63ebe..30c854c34d8f 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
@@ -126,6 +126,7 @@ enum intel_guc_action {
 	INTEL_GUC_ACTION_EXIT_S_STATE = 0x502,
 	INTEL_GUC_ACTION_SLPC_REQUEST = 0x3003,
 	INTEL_GUC_ACTION_AUTHENTICATE_HUC = 0x4000,
+	INTEL_GUC_ACTION_GET_HWCONFIG = 0x4100,
 	INTEL_GUC_ACTION_REGISTER_COMMAND_TRANSPORT_BUFFER = 0x4505,
 	INTEL_GUC_ACTION_DEREGISTER_COMMAND_TRANSPORT_BUFFER = 0x4506,
 	INTEL_GUC_ACTION_LIMIT
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.c b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
index 6661dcb02239..e810b56c49f7 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
@@ -400,13 +400,14 @@ int intel_guc_send_mmio(struct intel_guc *guc, const u32 *request, u32 len,
 	/*
 	 * No GuC command should ever take longer than 10ms.
 	 * Fast commands should still complete in 10us.
+	 * Except for the hwconfig table query, which takes ~50ms.
 	 */
 	ret = __intel_wait_for_register_fw(uncore,
 					   guc_send_reg(guc, 0),
 					   GUC_HXG_MSG_0_ORIGIN,
 					   FIELD_PREP(GUC_HXG_MSG_0_ORIGIN,
 						      GUC_HXG_ORIGIN_GUC),
-					   10, 10, &header);
+					   10, 100, &header);
 	if (unlikely(ret)) {
 timeout:
 		drm_err(&i915->drm, "mmio request %#x: no reply %x\n",
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 72e4653222e2..5988d0311cfc 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
@@ -12,6 +12,7 @@
 #include "intel_guc_ct.h"
 #include "intel_guc_log.h"
 #include "intel_guc_reg.h"
+#include "intel_guc_hwconfig.h"
 #include "intel_uc_fw.h"
 #include "i915_utils.h"
 #include "i915_vma.h"
@@ -27,6 +28,7 @@ struct intel_guc {
 	struct intel_uc_fw fw;
 	struct intel_guc_log log;
 	struct intel_guc_ct ct;
+	struct intel_guc_hwconfig hwconfig;
 
 	/* intel_guc_recv interrupt related state */
 	spinlock_t irq_lock;
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..af4fc9fdbaaf
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_hwconfig.c
@@ -0,0 +1,156 @@
+// 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);
+	struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
+	u32 action[] = {
+		INTEL_GUC_ACTION_GET_HWCONFIG,
+		ggtt_offset,
+		ggtt_size,
+		(INTEL_DEVID(i915) << 16) | INTEL_REVID(i915),
+	};
+	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)) {
+		if (IS_ADLP_GT_STEP(i915, STEP_A0, STEP_A0))
+			return false;
+
+		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 6d8b9233214e..6df596152937 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
@@ -496,6 +496,10 @@ 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;
@@ -552,6 +556,8 @@ 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);
 }
 
-- 
2.25.1