drm/i915: Avoid using word legacy with ppgtt

The term legacy is subjective. Use 3lvl and 4lvl
where appropriate.
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1488295691-9404-4-git-send-email-mika.kuoppala@intel.com

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -641,12 +641,12 @@ static int gen8_write_pdp(struct drm_i915_gem_request *req,
 	return 0;
 }
 
-static int gen8_legacy_mm_switch(struct i915_hw_ppgtt *ppgtt,
-				 struct drm_i915_gem_request *req)
+static int gen8_mm_switch_3lvl(struct i915_hw_ppgtt *ppgtt,
+			       struct drm_i915_gem_request *req)
 {
 	int i, ret;
 
-	for (i = GEN8_LEGACY_PDPES - 1; i >= 0; i--) {
+	for (i = GEN8_3LVL_PDPES - 1; i >= 0; i--) {
 		const dma_addr_t pd_daddr = i915_page_dir_dma_addr(ppgtt, i);
 
 		ret = gen8_write_pdp(req, i, pd_daddr);
@@ -657,8 +657,8 @@ static int gen8_legacy_mm_switch(struct i915_hw_ppgtt *ppgtt,
 	return 0;
 }
 
-static int gen8_48b_mm_switch(struct i915_hw_ppgtt *ppgtt,
-			      struct drm_i915_gem_request *req)
+static int gen8_mm_switch_4lvl(struct i915_hw_ppgtt *ppgtt,
+			       struct drm_i915_gem_request *req)
 {
 	return gen8_write_pdp(req, 0, px_dma(&ppgtt->pml4));
 }
@@ -1016,7 +1016,7 @@ static int gen8_ppgtt_notify_vgt(struct i915_hw_ppgtt *ppgtt, bool create)
 		msg = (create ? VGT_G2V_PPGTT_L4_PAGE_TABLE_CREATE :
 				VGT_G2V_PPGTT_L4_PAGE_TABLE_DESTROY);
 	} else {
-		for (i = 0; i < GEN8_LEGACY_PDPES; i++) {
+		for (i = 0; i < GEN8_3LVL_PDPES; i++) {
 			const u64 daddr = i915_page_dir_dma_addr(ppgtt, i);
 
 			I915_WRITE(vgtif_reg(pdp[i].lo), lower_32_bits(daddr));
@@ -1356,8 +1356,7 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
 
 		gen8_initialize_pml4(&ppgtt->base, &ppgtt->pml4);
 
-		ppgtt->switch_mm = gen8_48b_mm_switch;
-
+		ppgtt->switch_mm = gen8_mm_switch_4lvl;
 		ppgtt->base.allocate_va_range = gen8_ppgtt_alloc_4lvl;
 		ppgtt->base.insert_entries = gen8_ppgtt_insert_4lvl;
 		ppgtt->base.clear_range = gen8_ppgtt_clear_4lvl;
@@ -1366,8 +1365,6 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
 		if (ret)
 			goto free_scratch;
 
-		ppgtt->switch_mm = gen8_legacy_mm_switch;
-
 		if (intel_vgpu_active(dev_priv)) {
 			ret = gen8_preallocate_top_level_pdp(ppgtt);
 			if (ret) {
@@ -1376,6 +1373,7 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
 			}
 		}
 
+		ppgtt->switch_mm = gen8_mm_switch_3lvl;
 		ppgtt->base.allocate_va_range = gen8_ppgtt_alloc_3lvl;
 		ppgtt->base.insert_entries = gen8_ppgtt_insert_3lvl;
 		ppgtt->base.clear_range = gen8_ppgtt_clear_3lvl;

drivers/gpu/drm/i915/i915_gem_gtt.h

@@ -101,13 +101,20 @@ typedef u64 gen8_ppgtt_pml4e_t;
 #define HSW_GTT_ADDR_ENCODE(addr)	((addr) | (((addr) >> 28) & 0x7f0))
 #define HSW_PTE_ADDR_ENCODE(addr)	HSW_GTT_ADDR_ENCODE(addr)
 
-/* GEN8 legacy style address is defined as a 3 level page table:
+/* GEN8 32b style address is defined as a 3 level page table:
  * 31:30 | 29:21 | 20:12 |  11:0
  * PDPE  |  PDE  |  PTE  | offset
  * The difference as compared to normal x86 3 level page table is the PDPEs are
  * programmed via register.
- *
- * GEN8 48b legacy style address is defined as a 4 level page table:
+ */
+#define GEN8_3LVL_PDPES			4
+#define GEN8_PDE_SHIFT			21
+#define GEN8_PDE_MASK			0x1ff
+#define GEN8_PTE_SHIFT			12
+#define GEN8_PTE_MASK			0x1ff
+#define GEN8_PTES			I915_PTES(sizeof(gen8_pte_t))
+
+/* GEN8 48b style address is defined as a 4 level page table:
  * 47:39 | 38:30 | 29:21 | 20:12 |  11:0
  * PML4E | PDPE  |  PDE  |  PTE  | offset
  */
@@ -118,12 +125,6 @@ typedef u64 gen8_ppgtt_pml4e_t;
 /* NB: GEN8_PDPE_MASK is untrue for 32b platforms, but it has no impact on 32b page
  * tables */
 #define GEN8_PDPE_MASK			0x1ff
-#define GEN8_PDE_SHIFT			21
-#define GEN8_PDE_MASK			0x1ff
-#define GEN8_PTE_SHIFT			12
-#define GEN8_PTE_MASK			0x1ff
-#define GEN8_LEGACY_PDPES		4
-#define GEN8_PTES			I915_PTES(sizeof(gen8_pte_t))
 
 #define PPAT_UNCACHED_INDEX		(_PAGE_PWT | _PAGE_PCD)
 #define PPAT_CACHED_PDE_INDEX		0 /* WB LLC */
@@ -466,7 +467,7 @@ i915_pdpes_per_pdp(const struct i915_address_space *vm)
 	if (i915_vm_is_48bit(vm))
 		return GEN8_PML4ES_PER_PML4;
 
-	return GEN8_LEGACY_PDPES;
+	return GEN8_3LVL_PDPES;
 }
 
 /* Equivalent to the gen6 version, For each pde iterates over every pde

drivers/gpu/drm/i915/intel_lrc.c

@@ -1265,7 +1265,7 @@ static int intel_logical_ring_emit_pdps(struct drm_i915_gem_request *req)
 {
 	struct i915_hw_ppgtt *ppgtt = req->ctx->ppgtt;
 	struct intel_engine_cs *engine = req->engine;
-	const int num_lri_cmds = GEN8_LEGACY_PDPES * 2;
+	const int num_lri_cmds = GEN8_3LVL_PDPES * 2;
 	u32 *cs;
 	int i;
 
@@ -1274,7 +1274,7 @@ static int intel_logical_ring_emit_pdps(struct drm_i915_gem_request *req)
 		return PTR_ERR(cs);
 
 	*cs++ = MI_LOAD_REGISTER_IMM(num_lri_cmds);
-	for (i = GEN8_LEGACY_PDPES - 1; i >= 0; i--) {
+	for (i = GEN8_3LVL_PDPES - 1; i >= 0; i--) {
 		const dma_addr_t pd_daddr = i915_page_dir_dma_addr(ppgtt, i);
 
 		*cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_UDW(engine, i));