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17  * DOC: WOPCM Layout
19  * The layout of the WOPCM will be fixed after writing to GuC WOPCM size and
25  *    +=========> +====================+ <== WOPCM Top
27  *    |     +===> +====================+ <== GuC WOPCM Top
32  *    |   WOPCM   |                    |
34  *  WOPCM   |     |    GuC FW RSVD     |
38  *    |     v     |   GuC WOPCM RSVD   |
39  *    |     +===> +====================+ <== GuC WOPCM base
40  *    |           |     WOPCM RSVD     |
43  *    +=========> +====================+ <== WOPCM Base
45  * GuC accessible WOPCM starts at GuC WOPCM base and ends at GuC WOPCM top.
46  * The top part of the WOPCM is reserved for hardware contexts (e.g. RC6
50 /* Default WOPCM size is 2MB from Gen11, 1MB on previous platforms */
53 /* 16KB WOPCM (RSVD WOPCM) is reserved from HuC firmware top. */
56 /* 16KB reserved at the beginning of GuC WOPCM. */
61 /* GuC WOPCM Offset value needs to be aligned to 16KB. */
64 /* 24KB at the end of WOPCM is reserved for RC6 CTX on BXT. */
66 /* 36KB WOPCM reserved at the end of WOPCM on CNL. */
73 static inline struct drm_i915_private *wopcm_to_i915(struct intel_wopcm *wopcm)
75 	return container_of(wopcm, struct drm_i915_private, wopcm);
79  * intel_wopcm_init_early() - Early initialization of the WOPCM.
80  * @wopcm: pointer to intel_wopcm.
82  * Setup the size of WOPCM which will be used by later on WOPCM partitioning.
84 void intel_wopcm_init_early(struct intel_wopcm *wopcm)
86 	struct drm_i915_private *i915 = wopcm_to_i915(wopcm);
92 		wopcm->size = GEN11_WOPCM_SIZE;
94 		wopcm->size = GEN9_WOPCM_SIZE;
96 	DRM_DEV_DEBUG_DRIVER(i915->drm.dev, "WOPCM: %uK\n", wopcm->size / 1024);
115 	 * GuC WOPCM size shall be at least a dword larger than the offset from
116 	 * WOPCM base (GuC WOPCM offset from WOPCM base + GEN9_GUC_WOPCM_OFFSET)
123 			"WOPCM: invalid GuC region size: %uK < %uK\n",
136 	 * On Gen9 & CNL A0, hardware requires the total available GuC WOPCM
141 		dev_err(i915->drm.dev, "WOPCM: no space for %s: %uK < %uK\n",
177 			"WOPCM: invalid GuC region layout: %uK + %uK > %uK\n",
185 		dev_err(i915->drm.dev, "WOPCM: no space for %s: %uK < %uK\n",
193 		dev_err(i915->drm.dev, "WOPCM: no space for %s: %uK < %uK\n",
219  * intel_wopcm_init() - Initialize the WOPCM structure.
220  * @wopcm: pointer to intel_wopcm.
222  * This function will partition WOPCM space based on GuC and HuC firmware sizes
224  * enforce platform dependent hardware restrictions on GuC WOPCM offset and
225  * size. It will fail the WOPCM init if any of these checks fail, so that the
226  * following WOPCM registers setup and GuC firmware uploading would be aborted.
228 void intel_wopcm_init(struct intel_wopcm *wopcm)
230 	struct drm_i915_private *i915 = wopcm_to_i915(wopcm);
241 	GEM_BUG_ON(!wopcm->size);
242 	GEM_BUG_ON(wopcm->guc.base);
243 	GEM_BUG_ON(wopcm->guc.size);
244 	GEM_BUG_ON(guc_fw_size >= wopcm->size);
245 	GEM_BUG_ON(huc_fw_size >= wopcm->size);
246 	GEM_BUG_ON(ctx_rsvd + WOPCM_RESERVED_SIZE >= wopcm->size);
253 				     "GuC WOPCM is already locked [%uK, %uK)\n",
260 	 * Aligned value of guc_wopcm_base will determine available WOPCM space
268 	 * correct. Formal check of whole WOPCM layout will be done below.
270 	guc_wopcm_base = min(guc_wopcm_base, wopcm->size - ctx_rsvd);
272 	/* Aligned remainings of usable WOPCM space can be assigned to GuC. */
273 	guc_wopcm_size = wopcm->size - ctx_rsvd - guc_wopcm_base;
276 	DRM_DEV_DEBUG_DRIVER(i915->drm.dev, "Calculated GuC WOPCM [%uK, %uK)\n",
280 	if (__check_layout(i915, wopcm->size, guc_wopcm_base, guc_wopcm_size,
282 		wopcm->guc.base = guc_wopcm_base;
283 		wopcm->guc.size = guc_wopcm_size;
284 		GEM_BUG_ON(!wopcm->guc.base);
285 		GEM_BUG_ON(!wopcm->guc.size);