From 311482651d5e7bd6e8ad4e4b42e078ed3a866b4a Mon Sep 17 00:00:00 2001 From: Michal Wajdeczko Date: Fri, 16 Aug 2019 10:54:59 +0000 Subject: [PATCH] drm/i915/wopcm: Try to use already locked WOPCM layout If WOPCM layout is already locked in HW we shouldn't continue with our own partitioning as it could be likely different and we will be unable to enforce it and fail. Instead we should try to reuse what is already programmed, maybe there will be a fit. This should enable us to reload driver with slightly different HuC firmware (or even without HuC) without need to reboot. v2: reordered/rebased Signed-off-by: Michal Wajdeczko Cc: Daniele Ceraolo Spurio Cc: Chris Wilson Cc: Michal Winiarski Reviewed-by: Daniele Ceraolo Spurio Signed-off-by: Chris Wilson Link: https://patchwork.freedesktop.org/patch/msgid/20190816105501.31020-4-michal.wajdeczko@intel.com --- drivers/gpu/drm/i915/intel_wopcm.c | 29 +++++++++++++++++++++++++++-- 1 file changed, 27 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_wopcm.c b/drivers/gpu/drm/i915/intel_wopcm.c index f5cf11e2efbd..209c3b589136 100644 --- a/drivers/gpu/drm/i915/intel_wopcm.c +++ b/drivers/gpu/drm/i915/intel_wopcm.c @@ -190,6 +190,21 @@ static inline bool __check_layout(struct drm_i915_private *i915, u32 wopcm_size, huc_fw_size); } +static bool __wopcm_regs_locked(struct intel_uncore *uncore, + u32 *guc_wopcm_base, u32 *guc_wopcm_size) +{ + u32 reg_base = intel_uncore_read(uncore, DMA_GUC_WOPCM_OFFSET); + u32 reg_size = intel_uncore_read(uncore, GUC_WOPCM_SIZE); + + if (!(reg_size & GUC_WOPCM_SIZE_LOCKED) || + !(reg_base & GUC_WOPCM_OFFSET_VALID)) + return false; + + *guc_wopcm_base = reg_base & GUC_WOPCM_OFFSET_MASK; + *guc_wopcm_size = reg_size & GUC_WOPCM_SIZE_MASK; + return true; +} + /** * intel_wopcm_init() - Initialize the WOPCM structure. * @wopcm: pointer to intel_wopcm. @@ -203,8 +218,9 @@ static inline bool __check_layout(struct drm_i915_private *i915, u32 wopcm_size, void intel_wopcm_init(struct intel_wopcm *wopcm) { struct drm_i915_private *i915 = wopcm_to_i915(wopcm); - u32 guc_fw_size = intel_uc_fw_get_upload_size(&i915->gt.uc.guc.fw); - u32 huc_fw_size = intel_uc_fw_get_upload_size(&i915->gt.uc.huc.fw); + struct intel_gt *gt = &i915->gt; + u32 guc_fw_size = intel_uc_fw_get_upload_size(>->uc.guc.fw); + u32 huc_fw_size = intel_uc_fw_get_upload_size(>->uc.huc.fw); u32 ctx_rsvd = context_reserved_size(i915); u32 guc_wopcm_base; u32 guc_wopcm_size; @@ -222,6 +238,14 @@ void intel_wopcm_init(struct intel_wopcm *wopcm) if (i915_inject_probe_failure(i915)) return; + if (__wopcm_regs_locked(gt->uncore, &guc_wopcm_base, &guc_wopcm_size)) { + DRM_DEV_DEBUG_DRIVER(i915->drm.dev, + "GuC WOPCM is already locked [%uK, %uK)\n", + guc_wopcm_base / SZ_1K, + guc_wopcm_size / SZ_1K); + goto check; + } + /* * Aligned value of guc_wopcm_base will determine available WOPCM space * for HuC firmware and mandatory reserved area. @@ -242,6 +266,7 @@ void intel_wopcm_init(struct intel_wopcm *wopcm) DRM_DEV_DEBUG_DRIVER(i915->drm.dev, "Calculated GuC WOPCM [%uK, %uK)\n", guc_wopcm_base / SZ_1K, guc_wopcm_size / SZ_1K); +check: if (__check_layout(i915, wopcm->size, guc_wopcm_base, guc_wopcm_size, guc_fw_size, huc_fw_size)) { wopcm->guc.base = guc_wopcm_base; -- 2.30.2