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 u32 intel_fbdev_fb_pitch_align(u32 stride) 14 { 15 return ALIGN(stride, 64); 16 } 17 18 struct drm_gem_object *intel_fbdev_fb_bo_create(struct drm_device *drm, int size) 19 { 20 struct drm_i915_private *dev_priv = to_i915(drm); 21 struct drm_i915_gem_object *obj; 22 23 obj = ERR_PTR(-ENODEV); 24 if (HAS_LMEM(dev_priv)) { 25 obj = i915_gem_object_create_lmem(dev_priv, size, 26 I915_BO_ALLOC_CONTIGUOUS | 27 I915_BO_ALLOC_USER); 28 } else { 29 /* 30 * If the FB is too big, just don't use it since fbdev is not very 31 * important and we should probably use that space with FBC or other 32 * features. 33 * 34 * Also skip stolen on MTL as Wa_22018444074 mitigation. 35 */ 36 if (!IS_METEORLAKE(dev_priv) && size * 2 < dev_priv->dsm.usable_size) 37 obj = i915_gem_object_create_stolen(dev_priv, size); 38 if (IS_ERR(obj)) 39 obj = i915_gem_object_create_shmem(dev_priv, size); 40 } 41 42 if (IS_ERR(obj)) { 43 drm_err(drm, "failed to allocate framebuffer (%pe)\n", obj); 44 return ERR_PTR(-ENOMEM); 45 } 46 47 return &obj->base; 48 } 49 50 void intel_fbdev_fb_bo_destroy(struct drm_gem_object *obj) 51 { 52 drm_gem_object_put(obj); 53 } 54 55 int intel_fbdev_fb_fill_info(struct drm_device *drm, struct fb_info *info, 56 struct drm_gem_object *_obj, struct i915_vma *vma) 57 { 58 struct drm_i915_private *i915 = to_i915(drm); 59 struct drm_i915_gem_object *obj = to_intel_bo(_obj); 60 struct i915_gem_ww_ctx ww; 61 void __iomem *vaddr; 62 int ret; 63 64 if (i915_gem_object_is_lmem(obj)) { 65 struct intel_memory_region *mem = obj->mm.region; 66 67 /* Use fbdev's framebuffer from lmem for discrete */ 68 info->fix.smem_start = 69 (unsigned long)(mem->io.start + 70 i915_gem_object_get_dma_address(obj, 0) - 71 mem->region.start); 72 info->fix.smem_len = obj->base.size; 73 } else { 74 struct i915_ggtt *ggtt = to_gt(i915)->ggtt; 75 76 /* Our framebuffer is the entirety of fbdev's system memory */ 77 info->fix.smem_start = 78 (unsigned long)(ggtt->gmadr.start + i915_ggtt_offset(vma)); 79 info->fix.smem_len = vma->size; 80 } 81 82 for_i915_gem_ww(&ww, ret, false) { 83 ret = i915_gem_object_lock(vma->obj, &ww); 84 85 if (ret) 86 continue; 87 88 vaddr = i915_vma_pin_iomap(vma); 89 if (IS_ERR(vaddr)) { 90 drm_err(drm, 91 "Failed to remap framebuffer into virtual memory (%pe)\n", vaddr); 92 ret = PTR_ERR(vaddr); 93 continue; 94 } 95 } 96 97 if (ret) 98 return ret; 99 100 info->screen_base = vaddr; 101 info->screen_size = intel_bo_to_drm_bo(obj)->size; 102 103 return 0; 104 } 105