Re: [PATCH 11/21] drm/i915/gtt: Introduce fill_page_dma()

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On 5/22/2015 6:05 PM, Mika Kuoppala wrote:
When we setup page directories and tables, we point the entries
to a to the next level scratch structure. Make this generic
by introducing a fill_page_dma which maps and flushes. We also
need 32 bit variant for legacy gens.

v2: Fix flushes and handle valleyview (Ville)

Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
---
  drivers/gpu/drm/i915/i915_gem_gtt.c | 71 +++++++++++++++++++------------------
  1 file changed, 37 insertions(+), 34 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index f747bd3..d020b5e 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -330,6 +330,31 @@ static void cleanup_page_dma(struct drm_device *dev, struct i915_page_dma *p)
         memset(p, 0, sizeof(*p));
  }

+static void fill_page_dma(struct drm_device *dev, struct i915_page_dma *p,
+                         const uint64_t val)
+{
+       int i;
+       uint64_t * const vaddr = kmap_atomic(p->page);
+
+       for (i = 0; i < 512; i++)
+               vaddr[i] = val;
+
+       if (!HAS_LLC(dev) && !IS_VALLEYVIEW(dev))
+               drm_clflush_virt_range(vaddr, PAGE_SIZE);

Cherryview returns true to IS_VALLEYVIEW().

You can use(!HAS_LLC && IS_CHERRYVIEW) instead to flush in chv, but not in vlv... But to make it bxt-proof, (!HAS_LLC && INTEL_INFO(dev)->gen >= 8) is probably better.

+
+       kunmap_atomic(vaddr);
+}
+
+static void fill_page_dma_32(struct drm_device *dev, struct i915_page_dma *p,
+                            const uint32_t val32)
+{
+       uint64_t v = val32;
+
+       v = v << 32 | val32;
+
+       fill_page_dma(dev, p, v);
+}
+
  static void free_pt(struct drm_device *dev, struct i915_page_table *pt)
  {
         cleanup_page_dma(dev, &pt->base);
@@ -340,19 +365,11 @@ static void free_pt(struct drm_device *dev, struct i915_page_table *pt)
  static void gen8_initialize_pt(struct i915_address_space *vm,
                                struct i915_page_table *pt)
  {
-       gen8_pte_t *pt_vaddr, scratch_pte;
-       int i;
-
-       pt_vaddr = kmap_atomic(pt->base.page);
-       scratch_pte = gen8_pte_encode(vm->scratch.addr,
-                                     I915_CACHE_LLC, true);
+       gen8_pte_t scratch_pte;

-       for (i = 0; i < GEN8_PTES; i++)
-               pt_vaddr[i] = scratch_pte;
+       scratch_pte = gen8_pte_encode(vm->scratch.addr, I915_CACHE_LLC, true);

-       if (!HAS_LLC(vm->dev))
-               drm_clflush_virt_range(pt_vaddr, PAGE_SIZE);
-       kunmap_atomic(pt_vaddr);
+       fill_page_dma(vm->dev, &pt->base, scratch_pte);
  }

  static struct i915_page_table *alloc_pt(struct drm_device *dev)
@@ -585,20 +602,13 @@ static void gen8_initialize_pd(struct i915_address_space *vm,
                                struct i915_page_directory *pd)
  {
         struct i915_hw_ppgtt *ppgtt =
-                       container_of(vm, struct i915_hw_ppgtt, base);
-       gen8_pde_t *page_directory;
-       struct i915_page_table *pt;
-       int i;
+               container_of(vm, struct i915_hw_ppgtt, base);
+       gen8_pde_t scratch_pde;

-       page_directory = kmap_atomic(pd->base.page);
-       pt = ppgtt->scratch_pt;
-       for (i = 0; i < I915_PDES; i++)
-               /* Map the PDE to the page table */
-               __gen8_do_map_pt(page_directory + i, pt, vm->dev);
+       scratch_pde = gen8_pde_encode(vm->dev, ppgtt->scratch_pt->base.daddr,
+                                     I915_CACHE_LLC);

-       if (!HAS_LLC(vm->dev))
-               drm_clflush_virt_range(page_directory, PAGE_SIZE);
-       kunmap_atomic(page_directory);
+       fill_page_dma(vm->dev, &pd->base, scratch_pde);
  }

  static void gen8_free_page_tables(struct i915_page_directory *pd, struct drm_device *dev)
@@ -1292,22 +1302,15 @@ static void gen6_ppgtt_insert_entries(struct i915_address_space *vm,
  }

  static void gen6_initialize_pt(struct i915_address_space *vm,
-               struct i915_page_table *pt)
+                              struct i915_page_table *pt)
  {
-       gen6_pte_t *pt_vaddr, scratch_pte;
-       int i;
+       gen6_pte_t scratch_pte;

         WARN_ON(vm->scratch.addr == 0);

-       scratch_pte = vm->pte_encode(vm->scratch.addr,
-                       I915_CACHE_LLC, true, 0);
-
-       pt_vaddr = kmap_atomic(pt->base.page);
-
-       for (i = 0; i < GEN6_PTES; i++)
-               pt_vaddr[i] = scratch_pte;
+       scratch_pte = vm->pte_encode(vm->scratch.addr, I915_CACHE_LLC, true, 0);

-       kunmap_atomic(pt_vaddr);
+       fill_page_dma_32(vm->dev, &pt->base, scratch_pte);
  }

  static int gen6_alloc_va_range(struct i915_address_space *vm,
--
1.9.1

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