1 /* SPDX-License-Identifier: MIT */ 2 /* 3 * Copyright © 2023 Intel Corporation 4 */ 5 6 #include <drm/drm_fb_helper.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_display_core.h" 14 #include "intel_display_types.h" 15 #include "intel_fb.h" 16 #include "intel_fbdev_fb.h" 17 18 struct intel_framebuffer *intel_fbdev_fb_alloc(struct drm_fb_helper *helper, 19 struct drm_fb_helper_surface_size *sizes) 20 { 21 struct intel_display *display = to_intel_display(helper->dev); 22 struct drm_i915_private *dev_priv = to_i915(display->drm); 23 struct drm_framebuffer *fb; 24 struct drm_mode_fb_cmd2 mode_cmd = {}; 25 struct drm_i915_gem_object *obj; 26 int size; 27 28 /* we don't do packed 24bpp */ 29 if (sizes->surface_bpp == 24) 30 sizes->surface_bpp = 32; 31 32 mode_cmd.width = sizes->surface_width; 33 mode_cmd.height = sizes->surface_height; 34 35 mode_cmd.pitches[0] = ALIGN(mode_cmd.width * 36 DIV_ROUND_UP(sizes->surface_bpp, 8), 64); 37 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 38 sizes->surface_depth); 39 40 size = mode_cmd.pitches[0] * mode_cmd.height; 41 size = PAGE_ALIGN(size); 42 43 obj = ERR_PTR(-ENODEV); 44 if (HAS_LMEM(dev_priv)) { 45 obj = i915_gem_object_create_lmem(dev_priv, size, 46 I915_BO_ALLOC_CONTIGUOUS | 47 I915_BO_ALLOC_USER); 48 } else { 49 /* 50 * If the FB is too big, just don't use it since fbdev is not very 51 * important and we should probably use that space with FBC or other 52 * features. 53 * 54 * Also skip stolen on MTL as Wa_22018444074 mitigation. 55 */ 56 if (!display->platform.meteorlake && size * 2 < dev_priv->dsm.usable_size) 57 obj = i915_gem_object_create_stolen(dev_priv, size); 58 if (IS_ERR(obj)) 59 obj = i915_gem_object_create_shmem(dev_priv, size); 60 } 61 62 if (IS_ERR(obj)) { 63 drm_err(display->drm, "failed to allocate framebuffer (%pe)\n", obj); 64 return ERR_PTR(-ENOMEM); 65 } 66 67 fb = intel_framebuffer_create(intel_bo_to_drm_bo(obj), 68 drm_get_format_info(display->drm, 69 mode_cmd.pixel_format, 70 mode_cmd.modifier[0]), 71 &mode_cmd); 72 i915_gem_object_put(obj); 73 74 return to_intel_framebuffer(fb); 75 } 76 77 int intel_fbdev_fb_fill_info(struct intel_display *display, struct fb_info *info, 78 struct drm_gem_object *_obj, struct i915_vma *vma) 79 { 80 struct drm_i915_private *i915 = to_i915(display->drm); 81 struct drm_i915_gem_object *obj = to_intel_bo(_obj); 82 struct i915_gem_ww_ctx ww; 83 void __iomem *vaddr; 84 int ret; 85 86 if (i915_gem_object_is_lmem(obj)) { 87 struct intel_memory_region *mem = obj->mm.region; 88 89 /* Use fbdev's framebuffer from lmem for discrete */ 90 info->fix.smem_start = 91 (unsigned long)(mem->io.start + 92 i915_gem_object_get_dma_address(obj, 0) - 93 mem->region.start); 94 info->fix.smem_len = obj->base.size; 95 } else { 96 struct i915_ggtt *ggtt = to_gt(i915)->ggtt; 97 98 /* Our framebuffer is the entirety of fbdev's system memory */ 99 info->fix.smem_start = 100 (unsigned long)(ggtt->gmadr.start + i915_ggtt_offset(vma)); 101 info->fix.smem_len = vma->size; 102 } 103 104 for_i915_gem_ww(&ww, ret, false) { 105 ret = i915_gem_object_lock(vma->obj, &ww); 106 107 if (ret) 108 continue; 109 110 vaddr = i915_vma_pin_iomap(vma); 111 if (IS_ERR(vaddr)) { 112 drm_err(display->drm, 113 "Failed to remap framebuffer into virtual memory (%pe)\n", vaddr); 114 ret = PTR_ERR(vaddr); 115 continue; 116 } 117 } 118 119 if (ret) 120 return ret; 121 122 info->screen_base = vaddr; 123 info->screen_size = intel_bo_to_drm_bo(obj)->size; 124 125 return 0; 126 } 127