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_core.h" 12 #include "intel_display_types.h" 13 #include "intel_fb.h" 14 #include "intel_fbdev_fb.h" 15 16 struct intel_framebuffer *intel_fbdev_fb_alloc(struct drm_fb_helper *helper, 17 struct drm_fb_helper_surface_size *sizes) 18 { 19 struct intel_display *display = to_intel_display(helper->dev); 20 struct drm_i915_private *dev_priv = to_i915(display->drm); 21 struct drm_framebuffer *fb; 22 struct drm_mode_fb_cmd2 mode_cmd = {}; 23 struct drm_i915_gem_object *obj; 24 int size; 25 26 /* we don't do packed 24bpp */ 27 if (sizes->surface_bpp == 24) 28 sizes->surface_bpp = 32; 29 30 mode_cmd.width = sizes->surface_width; 31 mode_cmd.height = sizes->surface_height; 32 33 mode_cmd.pitches[0] = ALIGN(mode_cmd.width * 34 DIV_ROUND_UP(sizes->surface_bpp, 8), 64); 35 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 36 sizes->surface_depth); 37 38 size = mode_cmd.pitches[0] * mode_cmd.height; 39 size = PAGE_ALIGN(size); 40 41 obj = ERR_PTR(-ENODEV); 42 if (HAS_LMEM(dev_priv)) { 43 obj = i915_gem_object_create_lmem(dev_priv, size, 44 I915_BO_ALLOC_CONTIGUOUS | 45 I915_BO_ALLOC_USER); 46 } else { 47 /* 48 * If the FB is too big, just don't use it since fbdev is not very 49 * important and we should probably use that space with FBC or other 50 * features. 51 * 52 * Also skip stolen on MTL as Wa_22018444074 mitigation. 53 */ 54 if (!display->platform.meteorlake && size * 2 < dev_priv->dsm.usable_size) 55 obj = i915_gem_object_create_stolen(dev_priv, size); 56 if (IS_ERR(obj)) 57 obj = i915_gem_object_create_shmem(dev_priv, size); 58 } 59 60 if (IS_ERR(obj)) { 61 drm_err(display->drm, "failed to allocate framebuffer (%pe)\n", obj); 62 return ERR_PTR(-ENOMEM); 63 } 64 65 fb = intel_framebuffer_create(intel_bo_to_drm_bo(obj), &mode_cmd); 66 i915_gem_object_put(obj); 67 68 return to_intel_framebuffer(fb); 69 } 70 71 int intel_fbdev_fb_fill_info(struct intel_display *display, struct fb_info *info, 72 struct drm_gem_object *_obj, struct i915_vma *vma) 73 { 74 struct drm_i915_private *i915 = to_i915(display->drm); 75 struct drm_i915_gem_object *obj = to_intel_bo(_obj); 76 struct i915_gem_ww_ctx ww; 77 void __iomem *vaddr; 78 int ret; 79 80 if (i915_gem_object_is_lmem(obj)) { 81 struct intel_memory_region *mem = obj->mm.region; 82 83 /* Use fbdev's framebuffer from lmem for discrete */ 84 info->fix.smem_start = 85 (unsigned long)(mem->io.start + 86 i915_gem_object_get_dma_address(obj, 0) - 87 mem->region.start); 88 info->fix.smem_len = obj->base.size; 89 } else { 90 struct i915_ggtt *ggtt = to_gt(i915)->ggtt; 91 92 /* Our framebuffer is the entirety of fbdev's system memory */ 93 info->fix.smem_start = 94 (unsigned long)(ggtt->gmadr.start + i915_ggtt_offset(vma)); 95 info->fix.smem_len = vma->size; 96 } 97 98 for_i915_gem_ww(&ww, ret, false) { 99 ret = i915_gem_object_lock(vma->obj, &ww); 100 101 if (ret) 102 continue; 103 104 vaddr = i915_vma_pin_iomap(vma); 105 if (IS_ERR(vaddr)) { 106 drm_err(display->drm, 107 "Failed to remap framebuffer into virtual memory (%pe)\n", vaddr); 108 ret = PTR_ERR(vaddr); 109 continue; 110 } 111 } 112 113 if (ret) 114 return ret; 115 116 info->screen_base = vaddr; 117 info->screen_size = intel_bo_to_drm_bo(obj)->size; 118 119 return 0; 120 } 121