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 "intel_fbdev_fb.h"
 9#include "xe_bo.h"
10#include "xe_ttm_stolen_mgr.h"
11#include "xe_wa.h"
12
13#include <generated/xe_device_wa_oob.h>
14
15/*
16 * FIXME: There shouldn't be any reason to have XE_PAGE_SIZE stride
17 * alignment. The same 64 as i915 uses should be fine, and we shouldn't need to
18 * have driver specific values. However, dropping the stride alignment to 64
19 * leads to underflowing the bo pin count in the atomic cleanup work.
20 */
21u32 intel_fbdev_fb_pitch_align(u32 stride)
22{
23	return ALIGN(stride, XE_PAGE_SIZE);
24}
25
26struct drm_gem_object *intel_fbdev_fb_bo_create(struct drm_device *drm, int size)
27{
28	struct xe_device *xe = to_xe_device(drm);
29	struct xe_bo *obj;
30
31	obj = ERR_PTR(-ENODEV);
32
33	if (!IS_DGFX(xe) && !XE_DEVICE_WA(xe, 22019338487_display)) {
34		obj = xe_bo_create_pin_map_novm(xe, xe_device_get_root_tile(xe),
35						size,
36						ttm_bo_type_kernel, XE_BO_FLAG_SCANOUT |
37						XE_BO_FLAG_STOLEN |
38						XE_BO_FLAG_GGTT, false);
39		if (!IS_ERR(obj))
40			drm_info(&xe->drm, "Allocated fbdev into stolen\n");
41		else
42			drm_info(&xe->drm, "Allocated fbdev into stolen failed: %li\n", PTR_ERR(obj));
43	}
44
45	if (IS_ERR(obj)) {
46		obj = xe_bo_create_pin_map_novm(xe, xe_device_get_root_tile(xe), size,
47						ttm_bo_type_kernel, XE_BO_FLAG_SCANOUT |
48						XE_BO_FLAG_VRAM_IF_DGFX(xe_device_get_root_tile(xe)) |
49						XE_BO_FLAG_GGTT, false);
50	}
51
52	if (IS_ERR(obj)) {
53		drm_err(&xe->drm, "failed to allocate framebuffer (%pe)\n", obj);
54		return ERR_PTR(-ENOMEM);
55	}
56
57	return &obj->ttm.base;
58}
59
60void intel_fbdev_fb_bo_destroy(struct drm_gem_object *obj)
61{
62	xe_bo_unpin_map_no_vm(gem_to_xe_bo(obj));
63}
64
65int intel_fbdev_fb_fill_info(struct drm_device *drm, struct fb_info *info,
66			     struct drm_gem_object *_obj, struct i915_vma *vma)
67{
68	struct xe_bo *obj = gem_to_xe_bo(_obj);
69	struct pci_dev *pdev = to_pci_dev(drm->dev);
70
71	if (!(obj->flags & XE_BO_FLAG_SYSTEM)) {
72		if (obj->flags & XE_BO_FLAG_STOLEN)
73			info->fix.smem_start = xe_ttm_stolen_io_offset(obj, 0);
74		else
75			info->fix.smem_start =
76				pci_resource_start(pdev, 2) +
77				xe_bo_addr(obj, 0, XE_PAGE_SIZE);
78
79		info->fix.smem_len = obj->ttm.base.size;
80	} else {
81		/* XXX: Pure fiction, as the BO may not be physically accessible.. */
82		info->fix.smem_start = 0;
83		info->fix.smem_len = obj->ttm.base.size;
84	}
85	XE_WARN_ON(iosys_map_is_null(&obj->vmap));
86
87	info->screen_base = obj->vmap.vaddr_iomem;
88	info->screen_size = obj->ttm.base.size;
89
90	return 0;
91}