drm/i915/guc: Add fetch of hwconfig blob

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.

The table is stored in the GT structure so that it can be fetched once
at driver load time. Keeping inside a GuC structure would mean it
would be release and reloaded on a GuC reset (part of a full GT
reset). However, the table does not change just because the GT has been
reset and the GuC reloaded. Also, dynamic memory allocations inside
the reset path are a problem.

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

v2 (John's v2 patch):
 * Move to GT level to avoid memory allocation during reset path (and
   unnecessary re-read of the table on a reset).

v5 (of Jordan's posting):
 * Various changes made by Jordan and recommended by Michal
   - Makefile ordering
   - Adjust "struct intel_guc_hwconfig hwconfig" comment
   - Set Copyright year to 2022 in intel_guc_hwconfig.c/.h
   - Drop inline from hwconfig_to_guc()
   - Replace hwconfig param with guc in __guc_action_get_hwconfig()
   - Move zero size check into guc_hwconfig_discover_size()
   - Change comment to say zero size offset/size is needed to get size
   - Add has_guc_hwconfig to devinfo and drop has_table()
   - Change drm_err to notice in __uc_init_hw() and use %pe

v6 (of Jordan's posting):
 * Added a couple more small changes recommended by Michal
 * Merge in John's v2 patch, but note:
   - Using drm_notice as recommended by Michal
   - Reverted Michal's suggestion of using devinfo

v7 (of Jordan's posting):
 * Change back to drm_err as preferred by John

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>
Acked-by: Jon Bloomfield <jon.bloomfield@intel.com>
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220306232157.1174335-2-jordan.l.justen@intel.com

2 files changed, 5 insertions, 0 deletions

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 e77f955435ce..f9b3dd146a7e 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
@@ -129,6 +129,7 @@ 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_DEREGISTER_CONTEXT_DONE = 0x4600,
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 c20658ee85a5..8085fb181274 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,
 };