1 /*
2 * Copyright © 2014 Broadcom
3 * Copyright © 208 Alyssa Rosenzweig
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
25 #include <errno.h>
26 #include <unistd.h>
27 #include <fcntl.h>
28
29 #include "util/format/u_format.h"
30 #include "util/os_file.h"
31 #include "util/u_math.h"
32 #include "util/u_memory.h"
33
34 #include "drm-uapi/drm.h"
35 #include "renderonly/renderonly.h"
36 #include "panfrost_drm_public.h"
37 #include "panfrost/pan_public.h"
38 #include "xf86drm.h"
39
40 static struct renderonly_scanout *
panfrost_create_kms_dumb_buffer_for_resource(struct pipe_resource * rsc,struct renderonly * ro,struct winsys_handle * out_handle)41 panfrost_create_kms_dumb_buffer_for_resource(struct pipe_resource *rsc,
42 struct renderonly *ro,
43 struct winsys_handle *out_handle)
44 {
45 /* Find the smallest width alignment that gives us a 64byte aligned stride */
46 unsigned blk_sz = util_format_get_blocksize(rsc->format);
47
48 assert(blk_sz);
49
50 unsigned align_w = 1;
51 for (unsigned i = 1; i <= blk_sz; i++) {
52 if (!((64 * i) % blk_sz)) {
53 align_w = (64 * i) / blk_sz;
54 break;
55 }
56 }
57
58 struct drm_mode_create_dumb create_dumb = {
59 .width = ALIGN_NPOT(rsc->width0, align_w),
60 .height = rsc->height0,
61 .bpp = util_format_get_blocksizebits(rsc->format),
62 };
63 struct drm_mode_destroy_dumb destroy_dumb = {0};
64
65 /* Align width to end up with a buffer that's aligned on 64 bytes. */
66
67 struct renderonly_scanout *scanout = CALLOC_STRUCT(renderonly_scanout);
68 if (!scanout)
69 return NULL;
70
71 /* create dumb buffer at scanout GPU */
72 int err = drmIoctl(ro->kms_fd, DRM_IOCTL_MODE_CREATE_DUMB, &create_dumb);
73 if (err < 0) {
74 fprintf(stderr, "DRM_IOCTL_MODE_CREATE_DUMB failed: %s\n",
75 strerror(errno));
76 goto free_scanout;
77 }
78
79 if (create_dumb.pitch % 64)
80 goto free_dumb;
81
82 scanout->handle = create_dumb.handle;
83 scanout->stride = create_dumb.pitch;
84
85 if (!out_handle)
86 return scanout;
87
88 /* fill in winsys handle */
89 memset(out_handle, 0, sizeof(*out_handle));
90 out_handle->type = WINSYS_HANDLE_TYPE_FD;
91 out_handle->stride = create_dumb.pitch;
92
93 err = drmPrimeHandleToFD(ro->kms_fd, create_dumb.handle, O_CLOEXEC,
94 (int *)&out_handle->handle);
95 if (err < 0) {
96 fprintf(stderr, "failed to export dumb buffer: %s\n", strerror(errno));
97 goto free_dumb;
98 }
99
100 return scanout;
101
102 free_dumb:
103 destroy_dumb.handle = scanout->handle;
104 drmIoctl(ro->kms_fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy_dumb);
105
106 free_scanout:
107 FREE(scanout);
108
109 return NULL;
110
111 }
112
113 struct pipe_screen *
panfrost_drm_screen_create(int fd)114 panfrost_drm_screen_create(int fd)
115 {
116 return panfrost_create_screen(os_dupfd_cloexec(fd), NULL);
117 }
118
119 struct pipe_screen *
panfrost_drm_screen_create_renderonly(struct renderonly * ro)120 panfrost_drm_screen_create_renderonly(struct renderonly *ro)
121 {
122 ro->create_for_resource = panfrost_create_kms_dumb_buffer_for_resource;
123 return panfrost_create_screen(os_dupfd_cloexec(ro->gpu_fd), ro);
124 }
125