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