On 9/23/2022 3:53 AM, Tvrtko Ursulin wrote:
On 22/09/2022 23:11, Daniele Ceraolo Spurio wrote:On MTL the primary GT doesn't have any media capabilities, so no video engines and no HuC. We must therefore skip the HuC fetch and load on that specific case. Given that other multi-GT platforms might have HuC on the primary GT, we can't just check for that and it is easier to instead check for the lack of VCS engines. Based on code from Aravind Iddamsetty Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx> Cc: Aravind Iddamsetty <aravind.iddamsetty@xxxxxxxxx> Cc: John Harrison <john.c.harrison@xxxxxxxxx> Cc: Alan Previn <alan.previn.teres.alexis@xxxxxxxxx> --- drivers/gpu/drm/i915/gt/uc/intel_huc.c | 21 +++++++++++++++++++++ drivers/gpu/drm/i915/i915_drv.h | 9 ++++++--- 2 files changed, 27 insertions(+), 3 deletions(-)diff --git a/drivers/gpu/drm/i915/gt/uc/intel_huc.c b/drivers/gpu/drm/i915/gt/uc/intel_huc.cindex 3bb8838e325a..d4e2b252f16c 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_huc.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_huc.c @@ -42,12 +42,33 @@ * HuC-specific commands. */ +static bool vcs_supported(struct intel_gt *gt) +{ + intel_engine_mask_t mask = gt->info.engine_mask; + + /* + * we can reach here from i915_driver_early_probe for primary+ * GT with it being not fully setup hence fall back to the device info's+ * engine mask + */ + if (!mask && gt_is_root(gt)) + mask = RUNTIME_INFO(gt->i915)->platform_engine_mask;Is it possible for all instances to be fused off? Wondering if the function shouldn't just use platform_engine_mask.
The spec says that there is always going to be at least 1 VCS (bspec 55417 in case you want to double-check). I don't see that changing in the future, because what's the point of having a media GT if you don't have any enabled VCS engines on it? Also, platform_engine_mask only contains the entries of the primary GT, for the other GTs we'd have to navigate the array in the device info structure and I don't think we want to do that from here when we've already copied the mask inside gt->info.engine_mask.
Daniele
Regards, Tvrtko+ + return __ENGINE_INSTANCES_MASK(mask, VCS0, I915_MAX_VCS); +} + void intel_huc_init_early(struct intel_huc *huc) { struct drm_i915_private *i915 = huc_to_gt(huc)->i915; + struct intel_gt *gt = huc_to_gt(huc); intel_uc_fw_init_early(&huc->fw, INTEL_UC_FW_TYPE_HUC); + if (!vcs_supported(gt)) {+ intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_NOT_SUPPORTED);+ return; + } + if (GRAPHICS_VER(i915) >= 11) { huc->status.reg = GEN11_HUC_KERNEL_LOAD_INFO; huc->status.mask = HUC_LOAD_SUCCESSFUL;diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.hindex 134fc1621821..8ca575202e5d 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h@@ -777,12 +777,15 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,#define __HAS_ENGINE(engine_mask, id) ((engine_mask) & BIT(id)) #define HAS_ENGINE(gt, id) __HAS_ENGINE((gt)->info.engine_mask, id) -#define ENGINE_INSTANCES_MASK(gt, first, count) ({ \ +#define __ENGINE_INSTANCES_MASK(mask, first, count) ({ \ unsigned int first__ = (first); \ unsigned int count__ = (count); \ - ((gt)->info.engine_mask & \ - GENMASK(first__ + count__ - 1, first__)) >> first__; \ + ((mask) & GENMASK(first__ + count__ - 1, first__)) >> first__; \ }) + +#define ENGINE_INSTANCES_MASK(gt, first, count) \ + __ENGINE_INSTANCES_MASK((gt)->info.engine_mask, first, count) + #define RCS_MASK(gt) \ ENGINE_INSTANCES_MASK(gt, RCS0, I915_MAX_RCS) #define BCS_MASK(gt) \
