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_fb.h" 13 #include "intel_fbdev_fb.h" 14 15 struct intel_framebuffer *intel_fbdev_fb_alloc(struct drm_fb_helper *helper, 16 struct drm_fb_helper_surface_size *sizes) 17 { 18 struct drm_framebuffer *fb; 19 struct drm_device *dev = helper->dev; 20 struct drm_i915_private *dev_priv = to_i915(dev); 21 struct drm_mode_fb_cmd2 mode_cmd = {}; 22 struct drm_i915_gem_object *obj; 23 int size; 24 25 /* we don't do packed 24bpp */ 26 if (sizes->surface_bpp == 24) 27 sizes->surface_bpp = 32; 28 29 mode_cmd.width = sizes->surface_width; 30 mode_cmd.height = sizes->surface_height; 31 32 mode_cmd.pitches[0] = ALIGN(mode_cmd.width * 33 DIV_ROUND_UP(sizes->surface_bpp, 8), 64); 34 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 35 sizes->surface_depth); 36 37 size = mode_cmd.pitches[0] * mode_cmd.height; 38 size = PAGE_ALIGN(size); 39 40 obj = ERR_PTR(-ENODEV); 41 if (HAS_LMEM(dev_priv)) { 42 obj = i915_gem_object_create_lmem(dev_priv, size, 43 I915_BO_ALLOC_CONTIGUOUS | 44 I915_BO_ALLOC_USER); 45 } else { 46 /* 47 * If the FB is too big, just don't use it since fbdev is not very 48 * important and we should probably use that space with FBC or other 49 * features. 50 * 51 * Also skip stolen on MTL as Wa_22018444074 mitigation. 52 */ 53 if (!(IS_METEORLAKE(dev_priv)) && size * 2 < dev_priv->dsm.usable_size) 54 obj = i915_gem_object_create_stolen(dev_priv, size); 55 if (IS_ERR(obj)) 56 obj = i915_gem_object_create_shmem(dev_priv, size); 57 } 58 59 if (IS_ERR(obj)) { 60 drm_err(&dev_priv->drm, "failed to allocate framebuffer (%pe)\n", obj); 61 return ERR_PTR(-ENOMEM); 62 } 63 64 fb = intel_framebuffer_create(intel_bo_to_drm_bo(obj), &mode_cmd); 65 i915_gem_object_put(obj); 66 67 return to_intel_framebuffer(fb); 68 } 69 70 int intel_fbdev_fb_fill_info(struct drm_i915_private *i915, struct fb_info *info, 71 struct drm_gem_object *_obj, struct i915_vma *vma) 72 { 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(&i915->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