drm/i915/bdw: Implement PPGTT insert

GEN8 insertion is very similar to GEN6.

v2: Rebase on top of Imre's for_each_sg_page helpers.

v3: Fixup my conversion (spotted by Ville).

v4: Rebase on top of the address space refactoring.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net> (v1)
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 32 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 2f138ed3730e..39bfaf290a95 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -230,6 +230,37 @@ static void gen8_ppgtt_clear_range(struct i915_address_space *vm,
         }
 }
 
+static void gen8_ppgtt_insert_entries(struct i915_address_space *vm,
+                                      struct sg_table *pages,
+                                      unsigned first_entry,
+                                      enum i915_cache_level cache_level)
+{
+        struct i915_hw_ppgtt *ppgtt =
+                container_of(vm, struct i915_hw_ppgtt, base);
+        gen8_gtt_pte_t *pt_vaddr;
+        unsigned act_pt = first_entry / GEN8_PTES_PER_PAGE;
+        unsigned act_pte = first_entry % GEN8_PTES_PER_PAGE;
+        struct sg_page_iter sg_iter;
+
+        pt_vaddr = kmap_atomic(&ppgtt->gen8_pt_pages[act_pt]);
+        for_each_sg_page(pages->sgl, &sg_iter, pages->nents, 0) {
+                dma_addr_t page_addr;
+
+                page_addr = sg_dma_address(sg_iter.sg) +
+                                (sg_iter.sg_pgoffset << PAGE_SHIFT);
+                pt_vaddr[act_pte] = gen8_pte_encode(page_addr, cache_level,
+                                                    true);
+                if (++act_pte == GEN8_PTES_PER_PAGE) {
+                        kunmap_atomic(pt_vaddr);
+                        act_pt++;
+                        pt_vaddr = kmap_atomic(&ppgtt->gen8_pt_pages[act_pt]);
+                        act_pte = 0;
+
+                }
+        }
+        kunmap_atomic(pt_vaddr);
+}
+
 static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
 {
         struct i915_hw_ppgtt *ppgtt =
@@ -296,7 +327,7 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt, uint64_t size)
         ppgtt->num_pt_pages = 1 << get_order(num_pt_pages << PAGE_SHIFT);
         ppgtt->num_pd_entries = max_pdp * GEN8_PDES_PER_PAGE;
         ppgtt->base.clear_range = gen8_ppgtt_clear_range;
-        ppgtt->base.insert_entries = NULL;
+        ppgtt->base.insert_entries = gen8_ppgtt_insert_entries;
         ppgtt->base.cleanup = gen8_ppgtt_cleanup;
 
         BUG_ON(ppgtt->num_pd_pages > GEN8_LEGACY_PDPS);