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1// SPDX-License-Identifier: GPL-2.0-only
2/**************************************************************************
3 * Copyright (c) 2007-2011, Intel Corporation.
4 * All Rights Reserved.
5 *
6 **************************************************************************/
7
8#include <linux/fb.h>
9
10#include <drm/drm_crtc_helper.h>
11#include <drm/drm_drv.h>
12#include <drm/drm_fb_helper.h>
13#include <drm/drm_framebuffer.h>
14
15#include "gem.h"
16#include "psb_drv.h"
17
18/*
19 * VM area struct
20 */
21
22static vm_fault_t psb_fbdev_vm_fault(struct vm_fault *vmf)
23{
24 struct vm_area_struct *vma = vmf->vma;
25 struct fb_info *info = vma->vm_private_data;
26 unsigned long address = vmf->address - (vmf->pgoff << PAGE_SHIFT);
27 unsigned long pfn = info->fix.smem_start >> PAGE_SHIFT;
28 vm_fault_t err = VM_FAULT_SIGBUS;
29 unsigned long page_num = vma_pages(vma);
30 unsigned long i;
31
32 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
33
34 for (i = 0; i < page_num; ++i) {
35 err = vmf_insert_mixed(vma, address, pfn);
36 if (unlikely(err & VM_FAULT_ERROR))
37 break;
38 address += PAGE_SIZE;
39 ++pfn;
40 }
41
42 return err;
43}
44
45static const struct vm_operations_struct psb_fbdev_vm_ops = {
46 .fault = psb_fbdev_vm_fault,
47};
48
49/*
50 * struct fb_ops
51 */
52
53static int psb_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
54{
55 if (vma->vm_pgoff != 0)
56 return -EINVAL;
57 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
58 return -EINVAL;
59
60 /*
61 * If this is a GEM object then info->screen_base is the virtual
62 * kernel remapping of the object. FIXME: Review if this is
63 * suitable for our mmap work
64 */
65 vma->vm_ops = &psb_fbdev_vm_ops;
66 vma->vm_private_data = info;
67 vm_flags_set(vma, VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP);
68
69 return 0;
70}
71
72static void psb_fbdev_fb_destroy(struct fb_info *info)
73{
74 struct drm_fb_helper *fb_helper = info->par;
75
76 drm_fb_helper_fini(fb_helper);
77
78 drm_client_buffer_delete(fb_helper->buffer);
79 drm_client_release(&fb_helper->client);
80}
81
82static const struct fb_ops psb_fbdev_fb_ops = {
83 .owner = THIS_MODULE,
84 __FB_DEFAULT_IOMEM_OPS_RDWR,
85 DRM_FB_HELPER_DEFAULT_OPS,
86 __FB_DEFAULT_IOMEM_OPS_DRAW,
87 .fb_mmap = psb_fbdev_fb_mmap,
88 .fb_destroy = psb_fbdev_fb_destroy,
89};
90
91static const struct drm_fb_helper_funcs psb_fbdev_fb_helper_funcs = {
92};
93
94/*
95 * struct drm_driver
96 */
97
98int psb_fbdev_driver_fbdev_probe(struct drm_fb_helper *fb_helper,
99 struct drm_fb_helper_surface_size *sizes)
100{
101 struct drm_client_dev *client = &fb_helper->client;
102 struct drm_device *dev = client->dev;
103 struct drm_file *file = client->file;
104 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
105 struct pci_dev *pdev = to_pci_dev(dev->dev);
106 struct fb_info *info = fb_helper->info;
107 u32 fourcc, pitch;
108 u64 size;
109 const struct drm_format_info *format;
110 struct drm_client_buffer *buffer;
111 struct psb_gem_object *backing;
112 struct drm_gem_object *obj;
113 u32 handle;
114 int ret;
115
116 /* No 24-bit packed mode */
117 if (sizes->surface_bpp == 24) {
118 sizes->surface_bpp = 32;
119 sizes->surface_depth = 24;
120 }
121
122try_psb_gem_create:
123 fourcc = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
124 format = drm_get_format_info(dev, fourcc, DRM_FORMAT_MOD_LINEAR);
125 pitch = ALIGN(drm_format_info_min_pitch(format, 0, sizes->surface_width), SZ_64);
126 size = ALIGN(pitch * sizes->surface_height, PAGE_SIZE);
127
128 /* Allocate the framebuffer in the GTT with stolen page backing */
129 backing = psb_gem_create(dev, size, "fb", true, PAGE_SIZE);
130 if (IS_ERR(backing)) {
131 ret = PTR_ERR(backing);
132 if (ret == -EBUSY && sizes->surface_bpp > 16) {
133 /*
134 * If the mode does not fit in 32 bit then switch to 16 bit to
135 * get a console on full resolution. User-space compositors will
136 * allocate their own 32-bit framebuffers.
137 */
138 sizes->surface_bpp = 16;
139 sizes->surface_depth = 16;
140 goto try_psb_gem_create;
141 }
142 return ret;
143 }
144 obj = &backing->base;
145
146 ret = drm_gem_handle_create(file, obj, &handle);
147 if (ret)
148 goto err_drm_gem_object_put;
149
150 buffer = drm_client_buffer_create(client, sizes->surface_width, sizes->surface_height,
151 fourcc, handle, pitch);
152 if (IS_ERR(buffer)) {
153 ret = PTR_ERR(buffer);
154 goto err_drm_gem_handle_delete;
155 }
156
157 fb_helper->funcs = &psb_fbdev_fb_helper_funcs;
158 fb_helper->buffer = buffer;
159 fb_helper->fb = buffer->fb;
160
161 info->fbops = &psb_fbdev_fb_ops;
162
163 /* Accessed stolen memory directly */
164 info->screen_base = dev_priv->vram_addr + backing->offset;
165 info->screen_size = obj->size;
166
167 drm_fb_helper_fill_info(info, fb_helper, sizes);
168
169 info->fix.smem_start = dev_priv->stolen_base + backing->offset;
170 info->fix.smem_len = obj->size;
171 info->fix.ywrapstep = 0;
172 info->fix.ypanstep = 0;
173 info->fix.mmio_start = pci_resource_start(pdev, 0);
174 info->fix.mmio_len = pci_resource_len(pdev, 0);
175
176 fb_memset_io(info->screen_base, 0, info->screen_size);
177
178 /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
179
180 dev_dbg(dev->dev, "allocated %dx%d fb\n", buffer->fb->width, buffer->fb->height);
181
182 /* The handle is only needed for creating the framebuffer.*/
183 drm_gem_handle_delete(file, handle);
184
185 /* The framebuffer still holds a references on the GEM object. */
186 drm_gem_object_put(obj);
187
188 return 0;
189
190err_drm_gem_handle_delete:
191 drm_gem_handle_delete(file, handle);
192err_drm_gem_object_put:
193 drm_gem_object_put(obj);
194 return ret;
195}