1 /* SPDX-License-Identifier: MIT */ 2 /* 3 * Copyright © 2023 Intel Corporation 4 */ 5 6 #include <drm/drm_fb_helper.h> 7 8 #include "gem/i915_gem_lmem.h" 9 10 #include "i915_drv.h" 11 #include "intel_display_types.h" 12 #include "intel_fbdev_fb.h" 13 14 struct intel_framebuffer *intel_fbdev_fb_alloc(struct drm_fb_helper *helper, 15 struct drm_fb_helper_surface_size *sizes) 16 { 17 struct drm_framebuffer *fb; 18 struct drm_device *dev = helper->dev; 19 struct drm_i915_private *dev_priv = to_i915(dev); 20 struct drm_mode_fb_cmd2 mode_cmd = {}; 21 struct drm_i915_gem_object *obj; 22 int size; 23 24 /* we don't do packed 24bpp */ 25 if (sizes->surface_bpp == 24) 26 sizes->surface_bpp = 32; 27 28 mode_cmd.width = sizes->surface_width; 29 mode_cmd.height = sizes->surface_height; 30 31 mode_cmd.pitches[0] = ALIGN(mode_cmd.width * 32 DIV_ROUND_UP(sizes->surface_bpp, 8), 64); 33 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 34 sizes->surface_depth); 35 36 size = mode_cmd.pitches[0] * mode_cmd.height; 37 size = PAGE_ALIGN(size); 38 39 obj = ERR_PTR(-ENODEV); 40 if (HAS_LMEM(dev_priv)) { 41 obj = i915_gem_object_create_lmem(dev_priv, size, 42 I915_BO_ALLOC_CONTIGUOUS | 43 I915_BO_ALLOC_USER); 44 } else { 45 /* 46 * If the FB is too big, just don't use it since fbdev is not very 47 * important and we should probably use that space with FBC or other 48 * features. 49 * 50 * Also skip stolen on MTL as Wa_22018444074 mitigation. 51 */ 52 if (!(IS_METEORLAKE(dev_priv)) && size * 2 < dev_priv->dsm.usable_size) 53 obj = i915_gem_object_create_stolen(dev_priv, size); 54 if (IS_ERR(obj)) 55 obj = i915_gem_object_create_shmem(dev_priv, size); 56 } 57 58 if (IS_ERR(obj)) { 59 drm_err(&dev_priv->drm, "failed to allocate framebuffer (%pe)\n", obj); 60 return ERR_PTR(-ENOMEM); 61 } 62 63 fb = intel_framebuffer_create(obj, &mode_cmd); 64 i915_gem_object_put(obj); 65 66 return to_intel_framebuffer(fb); 67 } 68 69 int intel_fbdev_fb_fill_info(struct drm_i915_private *i915, struct fb_info *info, 70 struct drm_gem_object *_obj, struct i915_vma *vma) 71 { 72 struct drm_i915_gem_object *obj = to_intel_bo(_obj); 73 struct i915_gem_ww_ctx ww; 74 void __iomem *vaddr; 75 int ret; 76 77 if (i915_gem_object_is_lmem(obj)) { 78 struct intel_memory_region *mem = obj->mm.region; 79 80 /* Use fbdev's framebuffer from lmem for discrete */ 81 info->fix.smem_start = 82 (unsigned long)(mem->io.start + 83 i915_gem_object_get_dma_address(obj, 0) - 84 mem->region.start); 85 info->fix.smem_len = obj->base.size; 86 } else { 87 struct i915_ggtt *ggtt = to_gt(i915)->ggtt; 88 89 /* Our framebuffer is the entirety of fbdev's system memory */ 90 info->fix.smem_start = 91 (unsigned long)(ggtt->gmadr.start + i915_ggtt_offset(vma)); 92 info->fix.smem_len = vma->size; 93 } 94 95 for_i915_gem_ww(&ww, ret, false) { 96 ret = i915_gem_object_lock(vma->obj, &ww); 97 98 if (ret) 99 continue; 100 101 vaddr = i915_vma_pin_iomap(vma); 102 if (IS_ERR(vaddr)) { 103 drm_err(&i915->drm, 104 "Failed to remap framebuffer into virtual memory (%pe)\n", vaddr); 105 ret = PTR_ERR(vaddr); 106 continue; 107 } 108 } 109 110 if (ret) 111 return ret; 112 113 info->screen_base = vaddr; 114 info->screen_size = intel_bo_to_drm_bo(obj)->size; 115 116 return 0; 117 } 118