drm/i915/gtt/dg1: add PTE_LM plumbing for GGTT

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.

BSpec: 45015

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20210203171231.551338-3-matthew.auld@intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c b/drivers/gpu/drm/i915/gt/intel_ggtt.c
index fc399ac..b0b8ded 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_ggtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c
@@ -10,6 +10,8 @@
 
 #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 +191,12 @@ 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)
@@ -201,13 +208,13 @@ static void gen8_ggtt_insert_page(struct i915_address_space *vm,
                                  dma_addr_t addr,
                                  u64 offset,
                                  enum i915_cache_level level,
-                                 u32 unused)
+                                 u32 flags)
 {
        struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
        gen8_pte_t __iomem *pte =
                (gen8_pte_t __iomem *)ggtt->gsm + offset / I915_GTT_PAGE_SIZE;
 
-       gen8_set_pte(pte, gen8_ggtt_pte_encode(addr, level, 0));
+       gen8_set_pte(pte, gen8_ggtt_pte_encode(addr, level, flags));
 
        ggtt->invalidate(ggtt);
 }
@@ -217,7 +224,7 @@ 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 +466,8 @@ 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 +803,7 @@ 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 +833,13 @@ 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 0eef625..24b5808 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -85,7 +85,9 @@ 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 BIT_ULL(11)
+#define GEN12_PPGTT_PTE_LM     BIT_ULL(11)
+
+#define GEN12_GGTT_PTE_LM      BIT_ULL(1)
 
 /*
  * Cacheability Control is a 4-bit value. The low three bits are stored in bits