intel_fbdev_fb.c

  1/* SPDX-License-Identifier: MIT */
  2/*
  3 * Copyright © 2023 Intel Corporation
  4 */
  5
  6#include <linux/fb.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_fbdev_fb.h"
 14
 15u32 intel_fbdev_fb_pitch_align(u32 stride)
 16{
 17	return ALIGN(stride, 64);
 18}
 19
 20struct drm_gem_object *intel_fbdev_fb_bo_create(struct drm_device *drm, int size)
 21{
 22	struct drm_i915_private *dev_priv = to_i915(drm);
 23	struct drm_i915_gem_object *obj;
 24
 25	obj = ERR_PTR(-ENODEV);
 26	if (HAS_LMEM(dev_priv)) {
 27		obj = i915_gem_object_create_lmem(dev_priv, size,
 28						  I915_BO_ALLOC_CONTIGUOUS |
 29						  I915_BO_ALLOC_USER);
 30	} else {
 31		/*
 32		 * If the FB is too big, just don't use it since fbdev is not very
 33		 * important and we should probably use that space with FBC or other
 34		 * features.
 35		 *
 36		 * Also skip stolen on MTL as Wa_22018444074 mitigation.
 37		 */
 38		if (!IS_METEORLAKE(dev_priv) && size * 2 < dev_priv->dsm.usable_size)
 39			obj = i915_gem_object_create_stolen(dev_priv, size);
 40		if (IS_ERR(obj))
 41			obj = i915_gem_object_create_shmem(dev_priv, size);
 42	}
 43
 44	if (IS_ERR(obj)) {
 45		drm_err(drm, "failed to allocate framebuffer (%pe)\n", obj);
 46		return ERR_PTR(-ENOMEM);
 47	}
 48
 49	return &obj->base;
 50}
 51
 52void intel_fbdev_fb_bo_destroy(struct drm_gem_object *obj)
 53{
 54	drm_gem_object_put(obj);
 55}
 56
 57int intel_fbdev_fb_fill_info(struct drm_device *drm, struct fb_info *info,
 58			     struct drm_gem_object *_obj, struct i915_vma *vma)
 59{
 60	struct drm_i915_private *i915 = to_i915(drm);
 61	struct drm_i915_gem_object *obj = to_intel_bo(_obj);
 62	struct i915_gem_ww_ctx ww;
 63	void __iomem *vaddr;
 64	int ret;
 65
 66	if (i915_gem_object_is_lmem(obj)) {
 67		struct intel_memory_region *mem = obj->mm.region;
 68
 69		/* Use fbdev's framebuffer from lmem for discrete */
 70		info->fix.smem_start =
 71			(unsigned long)(mem->io.start +
 72					i915_gem_object_get_dma_address(obj, 0) -
 73					mem->region.start);
 74		info->fix.smem_len = obj->base.size;
 75	} else {
 76		struct i915_ggtt *ggtt = to_gt(i915)->ggtt;
 77
 78		/* Our framebuffer is the entirety of fbdev's system memory */
 79		info->fix.smem_start =
 80			(unsigned long)(ggtt->gmadr.start + i915_ggtt_offset(vma));
 81		info->fix.smem_len = vma->size;
 82	}
 83
 84	for_i915_gem_ww(&ww, ret, false) {
 85		ret = i915_gem_object_lock(vma->obj, &ww);
 86
 87		if (ret)
 88			continue;
 89
 90		vaddr = i915_vma_pin_iomap(vma);
 91		if (IS_ERR(vaddr)) {
 92			drm_err(drm,
 93				"Failed to remap framebuffer into virtual memory (%pe)\n", vaddr);
 94			ret = PTR_ERR(vaddr);
 95			continue;
 96		}
 97	}
 98
 99	if (ret)
100		return ret;
101
102	info->screen_base = vaddr;
103	info->screen_size = intel_bo_to_drm_bo(obj)->size;
104
105	return 0;
106}