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
psb_fbdev_vm_fault(struct vm_fault * vmf)22 static 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
45 static const struct vm_operations_struct psb_fbdev_vm_ops = {
46 .fault = psb_fbdev_vm_fault,
47 };
48
49 /*
50 * struct fb_ops
51 */
52
psb_fbdev_fb_mmap(struct fb_info * info,struct vm_area_struct * vma)53 static 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
psb_fbdev_fb_destroy(struct fb_info * info)72 static void psb_fbdev_fb_destroy(struct fb_info *info)
73 {
74 struct drm_fb_helper *fb_helper = info->par;
75 struct drm_framebuffer *fb = fb_helper->fb;
76 struct drm_gem_object *obj = fb->obj[0];
77
78 drm_fb_helper_fini(fb_helper);
79
80 drm_framebuffer_unregister_private(fb);
81 drm_framebuffer_cleanup(fb);
82 kfree(fb);
83
84 drm_gem_object_put(obj);
85
86 drm_client_release(&fb_helper->client);
87 }
88
89 static const struct fb_ops psb_fbdev_fb_ops = {
90 .owner = THIS_MODULE,
91 __FB_DEFAULT_IOMEM_OPS_RDWR,
92 DRM_FB_HELPER_DEFAULT_OPS,
93 __FB_DEFAULT_IOMEM_OPS_DRAW,
94 .fb_mmap = psb_fbdev_fb_mmap,
95 .fb_destroy = psb_fbdev_fb_destroy,
96 };
97
98 static const struct drm_fb_helper_funcs psb_fbdev_fb_helper_funcs = {
99 };
100
101 /*
102 * struct drm_driver
103 */
104
psb_fbdev_driver_fbdev_probe(struct drm_fb_helper * fb_helper,struct drm_fb_helper_surface_size * sizes)105 int psb_fbdev_driver_fbdev_probe(struct drm_fb_helper *fb_helper,
106 struct drm_fb_helper_surface_size *sizes)
107 {
108 struct drm_device *dev = fb_helper->dev;
109 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
110 struct pci_dev *pdev = to_pci_dev(dev->dev);
111 struct fb_info *info = fb_helper->info;
112 struct drm_framebuffer *fb;
113 struct drm_mode_fb_cmd2 mode_cmd = { };
114 int size;
115 int ret;
116 struct psb_gem_object *backing;
117 struct drm_gem_object *obj;
118 u32 bpp, depth;
119
120 /* No 24-bit packed mode */
121 if (sizes->surface_bpp == 24) {
122 sizes->surface_bpp = 32;
123 sizes->surface_depth = 24;
124 }
125 bpp = sizes->surface_bpp;
126 depth = sizes->surface_depth;
127
128 /*
129 * If the mode does not fit in 32 bit then switch to 16 bit to get
130 * a console on full resolution. The X mode setting server will
131 * allocate its own 32-bit GEM framebuffer.
132 */
133 size = ALIGN(sizes->surface_width * DIV_ROUND_UP(bpp, 8), 64) *
134 sizes->surface_height;
135 size = ALIGN(size, PAGE_SIZE);
136
137 if (size > dev_priv->vram_stolen_size) {
138 sizes->surface_bpp = 16;
139 sizes->surface_depth = 16;
140 }
141 bpp = sizes->surface_bpp;
142 depth = sizes->surface_depth;
143
144 mode_cmd.width = sizes->surface_width;
145 mode_cmd.height = sizes->surface_height;
146 mode_cmd.pitches[0] = ALIGN(mode_cmd.width * DIV_ROUND_UP(bpp, 8), 64);
147 mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);
148
149 size = mode_cmd.pitches[0] * mode_cmd.height;
150 size = ALIGN(size, PAGE_SIZE);
151
152 /* Allocate the framebuffer in the GTT with stolen page backing */
153 backing = psb_gem_create(dev, size, "fb", true, PAGE_SIZE);
154 if (IS_ERR(backing))
155 return PTR_ERR(backing);
156 obj = &backing->base;
157
158 fb = psb_framebuffer_create(dev,
159 drm_get_format_info(dev, mode_cmd.pixel_format,
160 mode_cmd.modifier[0]),
161 &mode_cmd, obj);
162 if (IS_ERR(fb)) {
163 ret = PTR_ERR(fb);
164 goto err_drm_gem_object_put;
165 }
166
167 fb_helper->funcs = &psb_fbdev_fb_helper_funcs;
168 fb_helper->fb = fb;
169
170 info->fbops = &psb_fbdev_fb_ops;
171
172 /* Accessed stolen memory directly */
173 info->screen_base = dev_priv->vram_addr + backing->offset;
174 info->screen_size = size;
175
176 drm_fb_helper_fill_info(info, fb_helper, sizes);
177
178 info->fix.smem_start = dev_priv->stolen_base + backing->offset;
179 info->fix.smem_len = size;
180 info->fix.ywrapstep = 0;
181 info->fix.ypanstep = 0;
182 info->fix.mmio_start = pci_resource_start(pdev, 0);
183 info->fix.mmio_len = pci_resource_len(pdev, 0);
184
185 fb_memset_io(info->screen_base, 0, info->screen_size);
186
187 /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
188
189 dev_dbg(dev->dev, "allocated %dx%d fb\n", fb->width, fb->height);
190
191 return 0;
192
193 err_drm_gem_object_put:
194 drm_gem_object_put(obj);
195 return ret;
196 }
197