[Intel-gfx] [PATCH 2/7] drm/i915: reserve stolen for LMEM region

[Matthew Auld]

From: CQ Tang <cq.tang at intel.com>

The lmem region needs to remove the stolen part, which should just be a
case of snipping it off the end.

Signed-off-by: CQ Tang <cq.tang at intel.com>
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_region_lmem.c | 12 ++++++++----
 drivers/gpu/drm/i915/i915_reg.h             |  2 ++
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
index bdd38efe0811..30959c1e535f 100644
--- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
+++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
@@ -140,21 +140,24 @@ intel_setup_fake_lmem(struct drm_i915_private *i915)
 static struct intel_memory_region *
 setup_lmem(struct drm_i915_private *i915)
 {
+	struct intel_uncore *uncore = &i915->uncore;
 	struct pci_dev *pdev = i915->drm.pdev;
 	struct intel_memory_region *mem;
 	resource_size_t io_start;
-	resource_size_t size;
+	resource_size_t lmem_size;
 
 	/* Enables Local Memory functionality in GAM */
 	intel_uncore_write(&i915->uncore, GEN12_LMEM_CFG_ADDR,
 			   intel_uncore_read(&i915->uncore, GEN12_LMEM_CFG_ADDR) | LMEM_ENABLE);
 
+	/* Stolen starts from GSMBASE on DG1 */
+	lmem_size = intel_uncore_read64(uncore, GEN12_GSMBASE);
+
 	io_start = pci_resource_start(pdev, 2);
-	size = pci_resource_len(pdev, 2);
 
 	mem = intel_memory_region_create(i915,
 					 0,
-					 size,
+					 lmem_size,
 					 I915_GTT_PAGE_SIZE_4K,
 					 io_start,
 					 &intel_region_lmem_ops);
@@ -162,7 +165,8 @@ setup_lmem(struct drm_i915_private *i915)
 		drm_dbg(&i915->drm, "Intel graphics LMEM: %pR\n", &mem->region);
 		drm_dbg(&i915->drm, "Intel graphics LMEM IO start: %pa\n",
 			 &mem->io_start);
-		drm_info(&i915->drm, "Intel graphics LMEM size: %pa\n", &size);
+		drm_info(&i915->drm, "Intel graphics LMEM size: %pa\n",
+			 &lmem_size);
 	}
 
 	return mem;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 28001b5a3cb5..626ebbe64bfd 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -12114,6 +12114,8 @@ enum skl_power_gate {
 #define GEN12_LMEM_CFG_ADDR		_MMIO(0xcf58)
 #define   LMEM_ENABLE			(1 << 31)
 
+#define GEN12_GSMBASE			_MMIO(0x108100)
+
 /* gamt regs */
 #define GEN8_L3_LRA_1_GPGPU _MMIO(0x4dd4)
 #define   GEN8_L3_LRA_1_GPGPU_DEFAULT_VALUE_BDW  0x67F1427F /* max/min for LRA1/2 */
-- 
2.26.2