drm/amd/amdgpu: remove vram_page_split kernel option (v3)

This option is no longer needed.  The default code paths
are now the only option.

v2: Add HPAGE support and a default for non contiguous maps
v3: Misread 512 pages as MiB ...
Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -142,7 +142,6 @@ extern uint amdgpu_sdma_phase_quantum;
 extern char *amdgpu_disable_cu;
 extern char *amdgpu_virtual_display;
 extern uint amdgpu_pp_feature_mask;
-extern int amdgpu_vram_page_split;
 extern int amdgpu_ngg;
 extern int amdgpu_prim_buf_per_se;
 extern int amdgpu_pos_buf_per_se;

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -973,13 +973,6 @@ static int amdgpu_device_check_arguments(struct amdgpu_device *adev)
 
 	amdgpu_device_check_block_size(adev);
 
-	if (amdgpu_vram_page_split != -1 && (amdgpu_vram_page_split < 16 ||
-	    !is_power_of_2(amdgpu_vram_page_split))) {
-		dev_warn(adev->dev, "invalid VRAM page split (%d)\n",
-			 amdgpu_vram_page_split);
-		amdgpu_vram_page_split = 1024;
-	}
-
 	ret = amdgpu_device_get_job_timeout_settings(adev);
 	if (ret) {
 		dev_err(adev->dev, "invalid lockup_timeout parameter syntax\n");

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

@@ -108,7 +108,6 @@ int amdgpu_vm_fragment_size = -1;
 int amdgpu_vm_block_size = -1;
 int amdgpu_vm_fault_stop = 0;
 int amdgpu_vm_debug = 0;
-int amdgpu_vram_page_split = 512;
 int amdgpu_vm_update_mode = -1;
 int amdgpu_exp_hw_support = 0;
 int amdgpu_dc = -1;
@@ -342,13 +341,6 @@ module_param_named(vm_debug, amdgpu_vm_debug, int, 0644);
 MODULE_PARM_DESC(vm_update_mode, "VM update using CPU (0 = never (default except for large BAR(LB)), 1 = Graphics only, 2 = Compute only (default for LB), 3 = Both");
 module_param_named(vm_update_mode, amdgpu_vm_update_mode, int, 0444);
 
-/**
- * DOC: vram_page_split (int)
- * Override the number of pages after we split VRAM allocations (default 512, -1 = disable). The default is 512.
- */
-MODULE_PARM_DESC(vram_page_split, "Number of pages after we split VRAM allocations (default 512, -1 = disable)");
-module_param_named(vram_page_split, amdgpu_vram_page_split, int, 0444);
-
 /**
  * DOC: exp_hw_support (int)
  * Enable experimental hw support (1 = enable). The default is 0 (disabled).

drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c

@@ -284,17 +284,21 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man,
 	if (!lpfn)
 		lpfn = man->size;
 
-	if (place->flags & TTM_PL_FLAG_CONTIGUOUS ||
-	    amdgpu_vram_page_split == -1) {
+	if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
 		pages_per_node = ~0ul;
 		num_nodes = 1;
 	} else {
-		pages_per_node = max((uint32_t)amdgpu_vram_page_split,
-				     mem->page_alignment);
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+		pages_per_node = HPAGE_PMD_NR;
+#else
+		/* default to 2MB */
+		pages_per_node = (2UL << (20UL - PAGE_SHIFT));
+#endif
+		pages_per_node = max((uint32_t)pages_per_node, mem->page_alignment);
 		num_nodes = DIV_ROUND_UP(mem->num_pages, pages_per_node);
 	}
 
-	nodes = kvmalloc_array(num_nodes, sizeof(*nodes),
+	nodes = kvmalloc_array((uint32_t)num_nodes, sizeof(*nodes),
 			       GFP_KERNEL | __GFP_ZERO);
 	if (!nodes)
 		return -ENOMEM;