[RFC 2/8] drm/i915: Split PTE encode between Gen12 and Meteorlake

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursu...@intel.com>

No need to run extra instructions which will never trigger on platforms
before Meteorlake.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
---
 drivers/gpu/drm/i915/gt/gen8_ppgtt.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c 
b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
index c8568e5d1147..862ac1d2de25 100644
--- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
@@ -63,6 +63,30 @@ static u64 gen12_pte_encode(dma_addr_t addr,
 {
        gen8_pte_t pte = addr | GEN8_PAGE_PRESENT | GEN8_PAGE_RW;
 
+       if (unlikely(flags & PTE_READ_ONLY))
+               pte &= ~GEN8_PAGE_RW;
+
+       if (flags & PTE_LM)
+               pte |= GEN12_PPGTT_PTE_LM;
+
+       if (pat_index & BIT(0))
+               pte |= GEN12_PPGTT_PTE_PAT0;
+
+       if (pat_index & BIT(1))
+               pte |= GEN12_PPGTT_PTE_PAT1;
+
+       if (pat_index & BIT(2))
+               pte |= GEN12_PPGTT_PTE_PAT2;
+
+       return pte;
+}
+
+static u64 mtl_pte_encode(dma_addr_t addr,
+                         unsigned int pat_index,
+                         u32 flags)
+{
+       gen8_pte_t pte = addr | GEN8_PAGE_PRESENT | GEN8_PAGE_RW;
+
        if (unlikely(flags & PTE_READ_ONLY))
                pte &= ~GEN8_PAGE_RW;
 
@@ -995,6 +1019,8 @@ struct i915_ppgtt *gen8_ppgtt_create(struct intel_gt *gt,
         */
        ppgtt->vm.alloc_scratch_dma = alloc_pt_dma;
 
+       if (GRAPHICS_VER_FULL(gt->i915) >= IP_VER(12, 70))
+               ppgtt->vm.pte_encode = mtl_pte_encode;
        if (GRAPHICS_VER(gt->i915) >= 12)
                ppgtt->vm.pte_encode = gen12_pte_encode;
        else
-- 
2.39.2