1 /* SPDX-License-Identifier: MIT */ 2 /* 3 * Copyright © 2023 Intel Corporation 4 */ 5 6 #include <linux/fb.h> 7 8 #include <drm/drm_print.h> 9 10 #include "gem/i915_gem_lmem.h" 11 12 #include "i915_drv.h" 13 #include "intel_fbdev_fb.h" 14 15 u32 intel_fbdev_fb_pitch_align(u32 stride) 16 { 17 return ALIGN(stride, 64); 18 } 19 20 bool intel_fbdev_fb_prefer_stolen(struct drm_device *drm, unsigned int size) 21 { 22 struct drm_i915_private *i915 = to_i915(drm); 23 24 /* Skip stolen on MTL as Wa_22018444074 mitigation. */ 25 if (IS_METEORLAKE(i915)) 26 return false; 27 28 /* 29 * If the FB is too big, just don't use it since fbdev is not very 30 * important and we should probably use that space with FBC or other 31 * features. 32 */ 33 return i915->dsm.usable_size >= size * 2; 34 } 35 36 struct drm_gem_object *intel_fbdev_fb_bo_create(struct drm_device *drm, int size) 37 { 38 struct drm_i915_private *i915 = to_i915(drm); 39 struct drm_i915_gem_object *obj; 40 41 obj = ERR_PTR(-ENODEV); 42 if (HAS_LMEM(i915)) { 43 obj = i915_gem_object_create_lmem(i915, size, 44 I915_BO_ALLOC_CONTIGUOUS | 45 I915_BO_ALLOC_USER); 46 } else { 47 if (intel_fbdev_fb_prefer_stolen(drm, size)) 48 obj = i915_gem_object_create_stolen(i915, size); 49 else 50 drm_info(drm, "Allocating fbdev: Stolen memory not preferred.\n"); 51 52 if (IS_ERR(obj)) 53 obj = i915_gem_object_create_shmem(i915, size); 54 } 55 56 if (IS_ERR(obj)) { 57 drm_err(drm, "failed to allocate framebuffer (%pe)\n", obj); 58 return ERR_PTR(-ENOMEM); 59 } 60 61 return &obj->base; 62 } 63 64 void intel_fbdev_fb_bo_destroy(struct drm_gem_object *obj) 65 { 66 drm_gem_object_put(obj); 67 } 68 69 int intel_fbdev_fb_fill_info(struct drm_device *drm, struct fb_info *info, 70 struct drm_gem_object *_obj, struct i915_vma *vma) 71 { 72 struct drm_i915_private *i915 = to_i915(drm); 73 struct drm_i915_gem_object *obj = to_intel_bo(_obj); 74 struct i915_gem_ww_ctx ww; 75 void __iomem *vaddr; 76 int ret; 77 78 if (i915_gem_object_is_lmem(obj)) { 79 struct intel_memory_region *mem = obj->mm.region; 80 81 /* Use fbdev's framebuffer from lmem for discrete */ 82 info->fix.smem_start = 83 (unsigned long)(mem->io.start + 84 i915_gem_object_get_dma_address(obj, 0) - 85 mem->region.start); 86 info->fix.smem_len = obj->base.size; 87 } else { 88 struct i915_ggtt *ggtt = to_gt(i915)->ggtt; 89 90 /* Our framebuffer is the entirety of fbdev's system memory */ 91 info->fix.smem_start = 92 (unsigned long)(ggtt->gmadr.start + i915_ggtt_offset(vma)); 93 info->fix.smem_len = vma->size; 94 } 95 96 for_i915_gem_ww(&ww, ret, false) { 97 ret = i915_gem_object_lock(vma->obj, &ww); 98 99 if (ret) 100 continue; 101 102 vaddr = i915_vma_pin_iomap(vma); 103 if (IS_ERR(vaddr)) { 104 drm_err(drm, 105 "Failed to remap framebuffer into virtual memory (%pe)\n", vaddr); 106 ret = PTR_ERR(vaddr); 107 continue; 108 } 109 } 110 111 if (ret) 112 return ret; 113 114 info->screen_base = vaddr; 115 info->screen_size = intel_bo_to_drm_bo(obj)->size; 116 117 return 0; 118 } 119