drm/i915: Call out GEN6 PTE specificity

We can assume that the PTE layout, and size changes for future
generations. To avoid confusion with the existing GEN6 PTE typedef, give
it a GEN6_ prefix.

v2: Fixup checkpatch warning and bikeshed commit message slightly.

v3: Rebase on top of Imre's for_each_sg_pages rework.

v4: Fixup conflicts in patch series reordering.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net> (v1)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 15 insertions, 16 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 215d72ce3f67..091b2709cdeb 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -28,7 +28,7 @@
 #include "i915_trace.h"
 #include "intel_drv.h"
 
-typedef uint32_t gtt_pte_t;
+typedef uint32_t gen6_gtt_pte_t;
 
 /* PPGTT stuff */
 #define GEN6_GTT_ADDR_ENCODE(addr)      ((addr) | (((addr) >> 28) & 0xff0))
@@ -44,11 +44,11 @@ typedef uint32_t gtt_pte_t;
 #define GEN6_PTE_CACHE_LLC_MLC          (3 << 1)
 #define GEN6_PTE_ADDR_ENCODE(addr)      GEN6_GTT_ADDR_ENCODE(addr)
 
-static inline gtt_pte_t gen6_pte_encode(struct drm_device *dev,
+static inline gen6_gtt_pte_t gen6_pte_encode(struct drm_device *dev,
                                         dma_addr_t addr,
                                         enum i915_cache_level level)
 {
-        gtt_pte_t pte = GEN6_PTE_VALID;
+        gen6_gtt_pte_t pte = GEN6_PTE_VALID;
         pte |= GEN6_PTE_ADDR_ENCODE(addr);
 
         switch (level) {
@@ -72,7 +72,6 @@ static inline gtt_pte_t gen6_pte_encode(struct drm_device *dev,
                 BUG();
         }
 
-
         return pte;
 }
 
@@ -81,8 +80,7 @@ static void gen6_ppgtt_clear_range(struct i915_hw_ppgtt *ppgtt,
                                    unsigned first_entry,
                                    unsigned num_entries)
 {
-        gtt_pte_t *pt_vaddr;
-        gtt_pte_t scratch_pte;
+        gen6_gtt_pte_t *pt_vaddr, scratch_pte;
         unsigned act_pt = first_entry / I915_PPGTT_PT_ENTRIES;
         unsigned first_pte = first_entry % I915_PPGTT_PT_ENTRIES;
         unsigned last_pte, i;
@@ -114,7 +112,7 @@ static void gen6_ppgtt_insert_entries(struct i915_hw_ppgtt *ppgtt,
                                       unsigned first_entry,
                                       enum i915_cache_level cache_level)
 {
-        gtt_pte_t *pt_vaddr;
+        gen6_gtt_pte_t *pt_vaddr;
         unsigned act_pt = first_entry / I915_PPGTT_PT_ENTRIES;
         unsigned act_pte = first_entry % I915_PPGTT_PT_ENTRIES;
         struct sg_page_iter sg_iter;
@@ -208,7 +206,7 @@ static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
         ppgtt->clear_range(ppgtt, 0,
                            ppgtt->num_pd_entries*I915_PPGTT_PT_ENTRIES);
 
-        ppgtt->pd_offset = (first_pd_entry_in_global_pt)*sizeof(gtt_pte_t);
+        ppgtt->pd_offset = first_pd_entry_in_global_pt * sizeof(gen6_gtt_pte_t);
 
         return 0;
 
@@ -284,7 +282,7 @@ void i915_gem_init_ppgtt(struct drm_device *dev)
         uint32_t pd_offset;
         struct intel_ring_buffer *ring;
         struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt;
-        gtt_pte_t __iomem *pd_addr;
+        gen6_gtt_pte_t __iomem *pd_addr;
         uint32_t pd_entry;
         int i;
 
@@ -292,7 +290,8 @@ void i915_gem_init_ppgtt(struct drm_device *dev)
                 return;
 
 
-        pd_addr = (gtt_pte_t __iomem*)dev_priv->gtt.gsm + ppgtt->pd_offset/sizeof(gtt_pte_t);
+        pd_addr = (gen6_gtt_pte_t __iomem *)dev_priv->gtt.gsm +
+                ppgtt->pd_offset / sizeof(gen6_gtt_pte_t);
         for (i = 0; i < ppgtt->num_pd_entries; i++) {
                 dma_addr_t pt_addr;
 
@@ -416,8 +415,8 @@ static void gen6_ggtt_insert_entries(struct drm_device *dev,
                                      enum i915_cache_level level)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
-        gtt_pte_t __iomem *gtt_entries =
-                (gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry;
+        gen6_gtt_pte_t __iomem *gtt_entries =
+                (gen6_gtt_pte_t __iomem *)dev_priv->gtt.gsm + first_entry;
         int i = 0;
         struct sg_page_iter sg_iter;
         dma_addr_t addr;
@@ -451,8 +450,8 @@ static void gen6_ggtt_clear_range(struct drm_device *dev,
                                   unsigned int num_entries)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
-        gtt_pte_t scratch_pte;
-        gtt_pte_t __iomem *gtt_base = (gtt_pte_t __iomem *) dev_priv->gtt.gsm + first_entry;
+        gen6_gtt_pte_t scratch_pte, __iomem *gtt_base =
+                (gen6_gtt_pte_t __iomem *) dev_priv->gtt.gsm + first_entry;
         const int max_entries = gtt_total_entries(dev_priv->gtt) - first_entry;
         int i;
 
@@ -736,7 +735,7 @@ static int gen6_gmch_probe(struct drm_device *dev,
         else
                 *stolen = gen6_get_stolen_size(snb_gmch_ctl);
 
-        *gtt_total = (gtt_size / sizeof(gtt_pte_t)) << PAGE_SHIFT;
+        *gtt_total = (gtt_size / sizeof(gen6_gtt_pte_t)) << PAGE_SHIFT;
 
         /* For Modern GENs the PTEs and register space are split in the BAR */
         gtt_bus_addr = pci_resource_start(dev->pdev, 0) +
@@ -816,7 +815,7 @@ int i915_gem_gtt_init(struct drm_device *dev)
         if (ret)
                 return ret;
 
-        gtt_size = (dev_priv->gtt.total >> PAGE_SHIFT) * sizeof(gtt_pte_t);
+        gtt_size = (dev_priv->gtt.total >> PAGE_SHIFT) * sizeof(gen6_gtt_pte_t);
 
         /* GMADR is the PCI mmio aperture into the global GTT. */
         DRM_INFO("Memory usable by graphics device = %zdM\n",