ionalloc.cpp revision be2e1bb9057c8d0666de057743eeb898c78f34b0 
1/*
2 * Copyright (c) 2011-2012, Code Aurora Forum. All rights reserved.
3
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *   * Redistributions of source code must retain the above copyright
8 *     notice, this list of conditions and the following disclaimer.
9 *   * Redistributions in binary form must reproduce the above
10 *     copyright notice, this list of conditions and the following
11 *     disclaimer in the documentation and/or other materials provided
12 *     with the distribution.
13 *   * Neither the name of Code Aurora Forum, Inc. nor the names of its
14 *     contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
24 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
26 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
27 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#define DEBUG 0
31#include <linux/ioctl.h>
32#include <sys/mman.h>
33#include <stdlib.h>
34#include <fcntl.h>
35#include <cutils/log.h>
36#include <errno.h>
37#include "gralloc_priv.h"
38#include "ionalloc.h"
39
40using gralloc::IonAlloc;
41
42#define ION_DEVICE "/dev/ion"
43
44int IonAlloc::open_device()
45{
46    if(mIonFd == FD_INIT)
47        mIonFd = open(ION_DEVICE, O_RDONLY);
48
49    if(mIonFd < 0 ) {
50        ALOGE("%s: Failed to open ion device - %s",
51              __FUNCTION__, strerror(errno));
52        mIonFd = FD_INIT;
53        return -errno;
54    }
55    return 0;
56}
57
58void IonAlloc::close_device()
59{
60    if(mIonFd >= 0)
61        close(mIonFd);
62    mIonFd = FD_INIT;
63}
64
65int IonAlloc::alloc_buffer(alloc_data& data)
66{
67    Locker::Autolock _l(mLock);
68    int err = 0;
69    int ionSyncFd = FD_INIT;
70    int iFd = FD_INIT;
71    struct ion_handle_data handle_data;
72    struct ion_fd_data fd_data;
73    struct ion_allocation_data ionAllocData;
74
75    void *base = 0;
76
77    ionAllocData.len = data.size;
78    ionAllocData.align = data.align;
79    ionAllocData.flags = data.flags;
80
81    err = open_device();
82    if (err)
83        return err;
84
85    if(data.uncached) {
86        // Use the sync FD to alloc and map
87        // when we need uncached memory
88        ionSyncFd = open(ION_DEVICE, O_RDONLY|O_DSYNC);
89        if(ionSyncFd < 0) {
90            ALOGE("%s: Failed to open ion device - %s",
91                  __FUNCTION__, strerror(errno));
92            return -errno;
93        }
94        iFd = ionSyncFd;
95    } else {
96        iFd = mIonFd;
97    }
98
99    if(ioctl(iFd, ION_IOC_ALLOC, &ionAllocData)) {
100        err = -errno;
101        ALOGE("ION_IOC_ALLOC failed with error - %s", strerror(errno));
102        if(ionSyncFd >= 0)
103            close(ionSyncFd);
104        ionSyncFd = FD_INIT;
105        return err;
106    }
107
108    fd_data.handle = ionAllocData.handle;
109    handle_data.handle = ionAllocData.handle;
110    if(ioctl(iFd, ION_IOC_MAP, &fd_data)) {
111        err = -errno;
112        ALOGE("%s: ION_IOC_MAP failed with error - %s",
113              __FUNCTION__, strerror(errno));
114        ioctl(mIonFd, ION_IOC_FREE, &handle_data);
115        if(ionSyncFd >= 0)
116            close(ionSyncFd);
117        ionSyncFd = FD_INIT;
118        return err;
119    }
120
121    if(!(data.flags & ION_SECURE)) {
122        base = mmap(0, ionAllocData.len, PROT_READ|PROT_WRITE,
123                    MAP_SHARED, fd_data.fd, 0);
124        if(base == MAP_FAILED) {
125            err = -errno;
126            ALOGE("%s: Failed to map the allocated memory: %s",
127                  __FUNCTION__, strerror(errno));
128            ioctl(mIonFd, ION_IOC_FREE, &handle_data);
129            ionSyncFd = FD_INIT;
130            return err;
131        }
132        memset(base, 0, ionAllocData.len);
133        // Clean cache after memset
134        clean_buffer(base, data.size, data.offset, fd_data.fd);
135    }
136
137    //Close the uncached FD since we no longer need it;
138    if(ionSyncFd >= 0)
139        close(ionSyncFd);
140    ionSyncFd = FD_INIT;
141
142    data.base = base;
143    data.fd = fd_data.fd;
144    ioctl(mIonFd, ION_IOC_FREE, &handle_data);
145    ALOGD_IF(DEBUG, "ion: Allocated buffer base:%p size:%d fd:%d",
146          data.base, ionAllocData.len, data.fd);
147    return 0;
148}
149
150
151int IonAlloc::free_buffer(void* base, size_t size, int offset, int fd)
152{
153    Locker::Autolock _l(mLock);
154    ALOGD_IF(DEBUG, "ion: Freeing buffer base:%p size:%d fd:%d",
155          base, size, fd);
156    int err = 0;
157    err = open_device();
158    if (err)
159        return err;
160
161    if(base)
162        err = unmap_buffer(base, size, offset);
163    close(fd);
164    return err;
165}
166
167int IonAlloc::map_buffer(void **pBase, size_t size, int offset, int fd)
168{
169    int err = 0;
170    void *base = 0;
171    // It is a (quirky) requirement of ION to have opened the
172    // ion fd in the process that is doing the mapping
173    err = open_device();
174    if (err)
175        return err;
176
177    base = mmap(0, size, PROT_READ| PROT_WRITE,
178                MAP_SHARED, fd, 0);
179    *pBase = base;
180    if(base == MAP_FAILED) {
181        err = -errno;
182        ALOGE("ion: Failed to map memory in the client: %s",
183              strerror(errno));
184    } else {
185        ALOGD_IF(DEBUG, "ion: Mapped buffer base:%p size:%d offset:%d fd:%d",
186              base, size, offset, fd);
187    }
188    return err;
189}
190
191int IonAlloc::unmap_buffer(void *base, size_t size, int offset)
192{
193    ALOGD_IF(DEBUG, "ion: Unmapping buffer  base:%p size:%d", base, size);
194    int err = 0;
195    if(munmap(base, size)) {
196        err = -errno;
197        ALOGE("ion: Failed to unmap memory at %p : %s",
198              base, strerror(errno));
199    }
200    return err;
201
202}
203int IonAlloc::clean_buffer(void *base, size_t size, int offset, int fd)
204{
205    struct ion_flush_data flush_data;
206    struct ion_fd_data fd_data;
207    struct ion_handle_data handle_data;
208    struct ion_handle* handle;
209    int err = 0;
210
211    err = open_device();
212    if (err)
213        return err;
214
215    fd_data.fd = fd;
216    if (ioctl(mIonFd, ION_IOC_IMPORT, &fd_data)) {
217        err = -errno;
218        ALOGE("%s: ION_IOC_IMPORT failed with error - %s",
219              __FUNCTION__, strerror(errno));
220        return err;
221    }
222
223    handle_data.handle = fd_data.handle;
224    flush_data.handle  = fd_data.handle;
225    flush_data.vaddr   = base;
226    flush_data.offset  = offset;
227    flush_data.length  = size;
228    if(ioctl(mIonFd, ION_IOC_CLEAN_INV_CACHES, &flush_data)) {
229        err = -errno;
230        ALOGE("%s: ION_IOC_CLEAN_INV_CACHES failed with error - %s",
231              __FUNCTION__, strerror(errno));
232        ioctl(mIonFd, ION_IOC_FREE, &handle_data);
233        return err;
234    }
235    ioctl(mIonFd, ION_IOC_FREE, &handle_data);
236    return 0;
237}
238
239