[PATCH 4/4] drm/i915/gtt/dg1: add PTE_LM plumbing for GGTT

[Matthew Auld]

For the PTEs we get an LM bit, to signal whether the page resides in
SMEM or LMEM.

Based on a patch from Michel Thierry.

Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_ggtt.c | 19 ++++++++++++++++---
 drivers/gpu/drm/i915/gt/intel_gtt.h  |  3 ++-
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c b/drivers/gpu/drm/i915/gt/intel_ggtt.c
index 30187483cd92..5c78d41f6542 100644
--- a/drivers/gpu/drm/i915/gt/intel_ggtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c
@@ -10,6 +10,7 @@
 
 #include <drm/i915_drm.h>
 
+#include "gem/i915_gem_lmem.h"
 #include "intel_gt.h"
 #include "i915_drv.h"
 #include "i915_scatterlist.h"
@@ -189,7 +190,12 @@ static u64 gen8_ggtt_pte_encode(dma_addr_t addr,
 				enum i915_cache_level level,
 				u32 flags)
 {
-	return addr | _PAGE_PRESENT;
+	gen8_pte_t pte = addr | _PAGE_PRESENT;
+
+	if (flags & PTE_LM)
+		pte |= GEN12_GGTT_PTE_LM;
+
+	return pte;
 }
 
 static void gen8_set_pte(void __iomem *addr, gen8_pte_t pte)
@@ -217,7 +223,7 @@ static void gen8_ggtt_insert_entries(struct i915_address_space *vm,
 				     enum i915_cache_level level,
 				     u32 flags)
 {
-	const gen8_pte_t pte_encode = gen8_ggtt_pte_encode(0, level, 0);
+	const gen8_pte_t pte_encode = gen8_ggtt_pte_encode(0, level, flags);
 	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
 	gen8_pte_t __iomem *gte;
 	gen8_pte_t __iomem *end;
@@ -459,6 +465,8 @@ static void ggtt_bind_vma(struct i915_address_space *vm,
 	pte_flags = 0;
 	if (i915_gem_object_is_readonly(obj))
 		pte_flags |= PTE_READ_ONLY;
+	if (i915_gem_object_is_lmem(obj))
+		pte_flags |= PTE_LM;
 
 	vm->insert_entries(vm, vma, cache_level, pte_flags);
 	vma->page_sizes.gtt = I915_GTT_PAGE_SIZE;
@@ -794,6 +802,7 @@ static int ggtt_probe_common(struct i915_ggtt *ggtt, u64 size)
 	struct drm_i915_private *i915 = ggtt->vm.i915;
 	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 	phys_addr_t phys_addr;
+	u32 pte_flags;
 	int ret;
 
 	/* For Modern GENs the PTEs and register space are split in the BAR */
@@ -823,9 +832,13 @@ static int ggtt_probe_common(struct i915_ggtt *ggtt, u64 size)
 		return ret;
 	}
 
+	pte_flags = 0;
+	if (i915_gem_object_is_lmem(ggtt->vm.scratch[0]))
+		pte_flags |= PTE_LM;
+
 	ggtt->vm.scratch[0]->encode =
 		ggtt->vm.pte_encode(px_dma(ggtt->vm.scratch[0]),
-				    I915_CACHE_NONE, 0);
+				    I915_CACHE_NONE, pte_flags);
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index 4a1d9b5cc75b..55873663d37f 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -85,7 +85,8 @@ typedef u64 gen8_pte_t;
 #define BYT_PTE_SNOOPED_BY_CPU_CACHES	REG_BIT(2)
 #define BYT_PTE_WRITEABLE		REG_BIT(1)
 
-#define GEN12_PPGTT_PTE_LM (1 << 11)
+#define GEN12_GGTT_PTE_LM	(1 << 1)
+#define GEN12_PPGTT_PTE_LM	(1 << 11)
 
 /*
  * Cacheability Control is a 4-bit value. The low three bits are stored in bits
-- 
2.26.2