1 /*
2  * Copyright © 2011 Red Hat
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21  * IN THE SOFTWARE.
22  *
23  * Authors:
24  *    Jerome Glisse <j.glisse@gmail.com>
25  */
26 #define _FILE_OFFSET_BITS 64
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sys/mman.h>
31 #include <errno.h>
32 #include "xf86drm.h"
33 #include "radeon_drm.h"
34 #include "rbo.h"
35 
rbo(int fd,unsigned handle,unsigned size,unsigned alignment,void * ptr)36 struct rbo *rbo(int fd, unsigned handle, unsigned size,
37                 unsigned alignment, void *ptr)
38 {
39     struct rbo *bo;
40     int r;
41 
42     bo = calloc(1, sizeof(*bo));
43     if (bo == NULL) {
44         return NULL;
45     }
46     list_inithead(&bo->list);
47     bo->fd = fd;
48     bo->size = size;
49     bo->handle = handle;
50     bo->refcount = 1;
51     bo->alignment = alignment;
52 
53     if (handle) {
54         struct drm_gem_open open_arg;
55 
56         memset(&open_arg, 0, sizeof(open_arg));
57         open_arg.name = handle;
58         r = drmIoctl(fd, DRM_IOCTL_GEM_OPEN, &open_arg);
59         if (r != 0) {
60             free(bo);
61             return NULL;
62         }
63         bo->handle = open_arg.handle;
64     } else {
65         struct drm_radeon_gem_create args;
66 
67         args.size = size;
68         args.alignment = alignment;
69         args.initial_domain = RADEON_GEM_DOMAIN_CPU;
70         args.flags = 0;
71         args.handle = 0;
72         r = drmCommandWriteRead(fd, DRM_RADEON_GEM_CREATE,
73                                 &args, sizeof(args));
74         bo->handle = args.handle;
75         if (r) {
76             fprintf(stderr, "Failed to allocate :\n");
77             fprintf(stderr, "   size      : %d bytes\n", size);
78             fprintf(stderr, "   alignment : %d bytes\n", alignment);
79             free(bo);
80             return NULL;
81         }
82     }
83     if (ptr) {
84         if (rbo_map(bo)) {
85             fprintf(stderr, "%s failed to copy data into bo\n", __func__);
86             return rbo_decref(bo);
87         }
88         memcpy(bo->data, ptr, size);
89         rbo_unmap(bo);
90     }
91     return bo;
92 }
93 
rbo_map(struct rbo * bo)94 int rbo_map(struct rbo *bo)
95 {
96     struct drm_radeon_gem_mmap args;
97     void *ptr;
98     int r;
99 
100     if (bo->mapcount++ != 0) {
101         return 0;
102     }
103     /* Zero out args to make valgrind happy */
104     memset(&args, 0, sizeof(args));
105     args.handle = bo->handle;
106     args.offset = 0;
107     args.size = (uint64_t)bo->size;
108     r = drmCommandWriteRead(bo->fd, DRM_RADEON_GEM_MMAP,
109                             &args, sizeof(args));
110     if (r) {
111         fprintf(stderr, "error mapping %p 0x%08X (error = %d)\n",
112             bo, bo->handle, r);
113         return r;
114     }
115     ptr = mmap(0, args.size, PROT_READ|PROT_WRITE, MAP_SHARED, bo->fd, args.addr_ptr);
116     if (ptr == MAP_FAILED) {
117         fprintf(stderr, "%s failed to map bo\n", __func__);
118         return -errno;
119     }
120     bo->data = ptr;
121     return 0;
122 }
123 
rbo_unmap(struct rbo * bo)124 void rbo_unmap(struct rbo *bo)
125 {
126     if (--bo->mapcount > 0) {
127         return;
128     }
129     munmap(bo->data, bo->size);
130     bo->data = NULL;
131 }
132 
rbo_incref(struct rbo * bo)133 struct rbo *rbo_incref(struct rbo *bo)
134 {
135     bo->refcount++;
136     return bo;
137 }
138 
rbo_decref(struct rbo * bo)139 struct rbo *rbo_decref(struct rbo *bo)
140 {
141     struct drm_gem_close args;
142 
143     if (bo == NULL)
144         return NULL;
145     if (--bo->refcount > 0) {
146         return NULL;
147     }
148 
149     munmap(bo->data, bo->size);
150     memset(&args, 0, sizeof(args));
151     args.handle = bo->handle;
152     drmIoctl(bo->fd, DRM_IOCTL_GEM_CLOSE, &args);
153     memset(bo, 0, sizeof(struct rbo));
154     free(bo);
155     return NULL;
156 }
157 
rbo_wait(struct rbo * bo)158 int rbo_wait(struct rbo *bo)
159 {
160     struct drm_radeon_gem_wait_idle args;
161     int ret;
162 
163     /* Zero out args to make valgrind happy */
164     memset(&args, 0, sizeof(args));
165     args.handle = bo->handle;
166     do {
167         ret = drmCommandWriteRead(bo->fd, DRM_RADEON_GEM_WAIT_IDLE,
168                                   &args, sizeof(args));
169     } while (ret == -EBUSY);
170     return ret;
171 }
172