[PATCH 1/2] drm/i915/wopcm: Try to use already locked WOPCM layout

[Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>]

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.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Michal Winiarski <michal.winiarski@xxxxxxxxx>
---
 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 2bda24200498..e5bc7b8a433e 100644
--- a/drivers/gpu/drm/i915/intel_wopcm.c
+++ b/drivers/gpu/drm/i915/intel_wopcm.c
@@ -154,6 +154,21 @@ static inline int check_hw_restriction(struct drm_i915_private *i915,
 	return err;
 }
 
+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.
@@ -167,8 +182,9 @@ static inline int check_hw_restriction(struct drm_i915_private *i915,
 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(&gt->uc.guc.fw);
+	u32 huc_fw_size = intel_uc_fw_get_upload_size(&gt->uc.huc.fw);
 	u32 ctx_rsvd = context_reserved_size(i915);
 	u32 guc_wopcm_base;
 	u32 guc_wopcm_size;
@@ -185,6 +201,14 @@ 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;
+	}
+
 	if (guc_fw_size >= wopcm->size) {
 		DRM_ERROR("GuC FW (%uKiB) is too big to fit in WOPCM.",
 			  guc_fw_size / 1024);
@@ -211,6 +235,7 @@ void intel_wopcm_init(struct intel_wopcm *wopcm)
 	DRM_DEBUG_DRIVER("Calculated GuC WOPCM Region: [%uKiB, %uKiB)\n",
 			 guc_wopcm_base / 1024, guc_wopcm_size / 1024);
 
+check:
 	guc_wopcm_rsvd = GUC_WOPCM_RESERVED + GUC_WOPCM_STACK_RESERVED;
 	if ((guc_fw_size + guc_wopcm_rsvd) > guc_wopcm_size) {
 		DRM_ERROR("Need %uKiB WOPCM for GuC, %uKiB available.\n",
-- 
2.19.2

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