framebuffer.cpp revision f6b4e6bb146d4dee7424acff9737f539f8ed727f 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * Copyright (c) 2010-2013 The Linux Foundation. All rights reserved.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *      http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18#include <sys/mman.h>
19
20#include <cutils/log.h>
21#include <cutils/properties.h>
22#include <dlfcn.h>
23
24#include <hardware/hardware.h>
25
26#include <fcntl.h>
27#include <errno.h>
28#include <sys/ioctl.h>
29#include <string.h>
30#include <stdlib.h>
31#include <pthread.h>
32#include <cutils/atomic.h>
33
34#include <linux/fb.h>
35#include <linux/msm_mdp.h>
36
37#include <GLES/gl.h>
38
39#include "gralloc_priv.h"
40#include "fb_priv.h"
41#include "gr.h"
42#include <cutils/properties.h>
43#include <profiler.h>
44
45#define EVEN_OUT(x) if (x & 0x0001) {x--;}
46/** min of int a, b */
47static inline int min(int a, int b) {
48    return (a<b) ? a : b;
49}
50/** max of int a, b */
51static inline int max(int a, int b) {
52    return (a>b) ? a : b;
53}
54
55enum {
56    PAGE_FLIP = 0x00000001,
57};
58
59struct fb_context_t {
60    framebuffer_device_t  device;
61};
62
63
64static int fb_setSwapInterval(struct framebuffer_device_t* dev,
65                              int interval)
66{
67    //XXX: Get the value here and implement along with
68    //single vsync in HWC
69    char pval[PROPERTY_VALUE_MAX];
70    property_get("debug.egl.swapinterval", pval, "-1");
71    int property_interval = atoi(pval);
72    if (property_interval >= 0)
73        interval = property_interval;
74
75    fb_context_t* ctx = (fb_context_t*)dev;
76    private_module_t* m = reinterpret_cast<private_module_t*>(
77        dev->common.module);
78    if (interval < dev->minSwapInterval || interval > dev->maxSwapInterval)
79        return -EINVAL;
80
81    m->swapInterval = interval;
82    return 0;
83}
84
85static int fb_post(struct framebuffer_device_t* dev, buffer_handle_t buffer)
86{
87    private_module_t* m =
88        reinterpret_cast<private_module_t*>(dev->common.module);
89    private_handle_t *hnd = static_cast<private_handle_t*>
90        (const_cast<native_handle_t*>(buffer));
91    const size_t offset = hnd->base - m->framebuffer->base;
92    m->info.activate = FB_ACTIVATE_VBL;
93    m->info.yoffset = offset / m->finfo.line_length;
94    if (ioctl(m->framebuffer->fd, FBIOPUT_VSCREENINFO, &m->info) == -1) {
95        ALOGE("%s: FBIOPUT_VSCREENINFO for primary failed, str: %s",
96                __FUNCTION__, strerror(errno));
97        return -errno;
98    }
99    return 0;
100}
101
102static int fb_compositionComplete(struct framebuffer_device_t* dev)
103{
104    // TODO: Properly implement composition complete callback
105    glFinish();
106
107    return 0;
108}
109
110int mapFrameBufferLocked(struct private_module_t* module)
111{
112    // already initialized...
113    if (module->framebuffer) {
114        return 0;
115    }
116    char const * const device_template[] = {
117        "/dev/graphics/fb%u",
118        "/dev/fb%u",
119        0 };
120
121    int fd = -1;
122    int i=0;
123    char name[64];
124    char property[PROPERTY_VALUE_MAX];
125
126    while ((fd==-1) && device_template[i]) {
127        snprintf(name, 64, device_template[i], 0);
128        fd = open(name, O_RDWR, 0);
129        i++;
130    }
131    if (fd < 0)
132        return -errno;
133
134    memset(&module->commit, 0, sizeof(struct mdp_display_commit));
135
136    struct fb_fix_screeninfo finfo;
137    if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
138        return -errno;
139
140    struct fb_var_screeninfo info;
141    if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
142        return -errno;
143
144    info.reserved[0] = 0;
145    info.reserved[1] = 0;
146    info.reserved[2] = 0;
147    info.xoffset = 0;
148    info.yoffset = 0;
149    info.activate = FB_ACTIVATE_NOW;
150
151    /* Interpretation of offset for color fields: All offsets are from the
152     * right, inside a "pixel" value, which is exactly 'bits_per_pixel' wide
153     * (means: you can use the offset as right argument to <<). A pixel
154     * afterwards is a bit stream and is written to video memory as that
155     * unmodified. This implies big-endian byte order if bits_per_pixel is
156     * greater than 8.
157     */
158
159    if(info.bits_per_pixel == 32) {
160        /*
161         * Explicitly request RGBA_8888
162         */
163        info.bits_per_pixel = 32;
164        info.red.offset     = 24;
165        info.red.length     = 8;
166        info.green.offset   = 16;
167        info.green.length   = 8;
168        info.blue.offset    = 8;
169        info.blue.length    = 8;
170        info.transp.offset  = 0;
171        info.transp.length  = 8;
172
173        /* Note: the GL driver does not have a r=8 g=8 b=8 a=0 config, so if we
174         * do not use the MDP for composition (i.e. hw composition == 0), ask
175         * for RGBA instead of RGBX. */
176        if (property_get("debug.sf.hw", property, NULL) > 0 &&
177                                                           atoi(property) == 0)
178            module->fbFormat = HAL_PIXEL_FORMAT_RGBX_8888;
179        else if(property_get("debug.composition.type", property, NULL) > 0 &&
180                (strncmp(property, "mdp", 3) == 0))
181            module->fbFormat = HAL_PIXEL_FORMAT_RGBX_8888;
182        else
183            module->fbFormat = HAL_PIXEL_FORMAT_RGBA_8888;
184    } else {
185        /*
186         * Explicitly request 5/6/5
187         */
188        info.bits_per_pixel = 16;
189        info.red.offset     = 11;
190        info.red.length     = 5;
191        info.green.offset   = 5;
192        info.green.length   = 6;
193        info.blue.offset    = 0;
194        info.blue.length    = 5;
195        info.transp.offset  = 0;
196        info.transp.length  = 0;
197        module->fbFormat = HAL_PIXEL_FORMAT_RGB_565;
198    }
199
200    //adreno needs 4k aligned offsets. Max hole size is 4096-1
201    int  size = roundUpToPageSize(info.yres * info.xres *
202                                                       (info.bits_per_pixel/8));
203
204    /*
205     * Request NUM_BUFFERS screens (at least 2 for page flipping)
206     */
207    int numberOfBuffers = (int)(finfo.smem_len/size);
208    ALOGV("num supported framebuffers in kernel = %d", numberOfBuffers);
209
210    if (property_get("debug.gr.numframebuffers", property, NULL) > 0) {
211        int num = atoi(property);
212        if ((num >= NUM_FRAMEBUFFERS_MIN) && (num <= NUM_FRAMEBUFFERS_MAX)) {
213            numberOfBuffers = num;
214        }
215    }
216    if (numberOfBuffers > NUM_FRAMEBUFFERS_MAX)
217        numberOfBuffers = NUM_FRAMEBUFFERS_MAX;
218
219    ALOGV("We support %d buffers", numberOfBuffers);
220
221    //consider the included hole by 4k alignment
222    uint32_t line_length = (info.xres * info.bits_per_pixel / 8);
223    info.yres_virtual = (size * numberOfBuffers) / line_length;
224
225    uint32_t flags = PAGE_FLIP;
226
227    if (info.yres_virtual < ((size * 2) / line_length) ) {
228        // we need at least 2 for page-flipping
229        info.yres_virtual = size / line_length;
230        flags &= ~PAGE_FLIP;
231        ALOGW("page flipping not supported (yres_virtual=%d, requested=%d)",
232              info.yres_virtual, info.yres*2);
233    }
234
235    if (ioctl(fd, FBIOGET_VSCREENINFO, &info) == -1)
236        return -errno;
237
238    if (int(info.width) <= 0 || int(info.height) <= 0) {
239        // the driver doesn't return that information
240        // default to 160 dpi
241        info.width  = ((info.xres * 25.4f)/160.0f + 0.5f);
242        info.height = ((info.yres * 25.4f)/160.0f + 0.5f);
243    }
244
245    float xdpi = (info.xres * 25.4f) / info.width;
246    float ydpi = (info.yres * 25.4f) / info.height;
247#ifdef MSMFB_METADATA_GET
248    struct msmfb_metadata metadata;
249    memset(&metadata, 0 , sizeof(metadata));
250    metadata.op = metadata_op_frame_rate;
251    if (ioctl(fd, MSMFB_METADATA_GET, &metadata) == -1) {
252        ALOGE("Error retrieving panel frame rate");
253        return -errno;
254    }
255    float fps  = metadata.data.panel_frame_rate;
256#else
257    //XXX: Remove reserved field usage on all baselines
258    //The reserved[3] field is used to store FPS by the driver.
259    float fps  = info.reserved[3] & 0xFF;
260#endif
261    ALOGI("using (fd=%d)\n"
262          "id           = %s\n"
263          "xres         = %d px\n"
264          "yres         = %d px\n"
265          "xres_virtual = %d px\n"
266          "yres_virtual = %d px\n"
267          "bpp          = %d\n"
268          "r            = %2u:%u\n"
269          "g            = %2u:%u\n"
270          "b            = %2u:%u\n",
271          fd,
272          finfo.id,
273          info.xres,
274          info.yres,
275          info.xres_virtual,
276          info.yres_virtual,
277          info.bits_per_pixel,
278          info.red.offset, info.red.length,
279          info.green.offset, info.green.length,
280          info.blue.offset, info.blue.length
281         );
282
283    ALOGI("width        = %d mm (%f dpi)\n"
284          "height       = %d mm (%f dpi)\n"
285          "refresh rate = %.2f Hz\n",
286          info.width,  xdpi,
287          info.height, ydpi,
288          fps
289         );
290
291
292    if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo) == -1)
293        return -errno;
294
295    if (finfo.smem_len <= 0)
296        return -errno;
297
298    module->flags = flags;
299    module->info = info;
300    module->finfo = finfo;
301    module->xdpi = xdpi;
302    module->ydpi = ydpi;
303    module->fps = fps;
304    module->swapInterval = 1;
305
306    CALC_INIT();
307
308    /*
309     * map the framebuffer
310     */
311
312    int err;
313    module->numBuffers = info.yres_virtual / info.yres;
314    module->bufferMask = 0;
315    //adreno needs page aligned offsets. Align the fbsize to pagesize.
316    size_t fbSize = roundUpToPageSize(finfo.line_length * info.yres)*
317                    module->numBuffers;
318    module->framebuffer = new private_handle_t(fd, fbSize,
319                                        private_handle_t::PRIV_FLAGS_USES_ION,
320                                        BUFFER_TYPE_UI,
321                                        module->fbFormat, info.xres, info.yres);
322    void* vaddr = mmap(0, fbSize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
323    if (vaddr == MAP_FAILED) {
324        ALOGE("Error mapping the framebuffer (%s)", strerror(errno));
325        return -errno;
326    }
327    module->framebuffer->base = intptr_t(vaddr);
328    memset(vaddr, 0, fbSize);
329    module->currentOffset = 0;
330    //Enable vsync
331    int enable = 1;
332    ioctl(module->framebuffer->fd, MSMFB_OVERLAY_VSYNC_CTRL,
333             &enable);
334    return 0;
335}
336
337static int mapFrameBuffer(struct private_module_t* module)
338{
339    int err = -1;
340    char property[PROPERTY_VALUE_MAX];
341    if((property_get("debug.gralloc.map_fb_memory", property, NULL) > 0) &&
342       (!strncmp(property, "1", PROPERTY_VALUE_MAX ) ||
343        (!strncasecmp(property,"true", PROPERTY_VALUE_MAX )))) {
344        pthread_mutex_lock(&module->lock);
345        err = mapFrameBufferLocked(module);
346        pthread_mutex_unlock(&module->lock);
347    }
348    return err;
349}
350
351/*****************************************************************************/
352
353static int fb_close(struct hw_device_t *dev)
354{
355    fb_context_t* ctx = (fb_context_t*)dev;
356    if (ctx) {
357        free(ctx);
358    }
359    return 0;
360}
361
362int fb_device_open(hw_module_t const* module, const char* name,
363                   hw_device_t** device)
364{
365    int status = -EINVAL;
366    if (!strcmp(name, GRALLOC_HARDWARE_FB0)) {
367        alloc_device_t* gralloc_device;
368        status = gralloc_open(module, &gralloc_device);
369        if (status < 0)
370            return status;
371
372        /* initialize our state here */
373        fb_context_t *dev = (fb_context_t*)malloc(sizeof(*dev));
374        memset(dev, 0, sizeof(*dev));
375
376        /* initialize the procs */
377        dev->device.common.tag      = HARDWARE_DEVICE_TAG;
378        dev->device.common.version  = 0;
379        dev->device.common.module   = const_cast<hw_module_t*>(module);
380        dev->device.common.close    = fb_close;
381        dev->device.setSwapInterval = fb_setSwapInterval;
382        dev->device.post            = fb_post;
383        dev->device.setUpdateRect   = 0;
384        dev->device.compositionComplete = fb_compositionComplete;
385
386        private_module_t* m = (private_module_t*)module;
387        status = mapFrameBuffer(m);
388        if (status >= 0) {
389            int stride = m->finfo.line_length / (m->info.bits_per_pixel >> 3);
390            const_cast<uint32_t&>(dev->device.flags) = 0;
391            const_cast<uint32_t&>(dev->device.width) = m->info.xres;
392            const_cast<uint32_t&>(dev->device.height) = m->info.yres;
393            const_cast<int&>(dev->device.stride) = stride;
394            const_cast<int&>(dev->device.format) = m->fbFormat;
395            const_cast<float&>(dev->device.xdpi) = m->xdpi;
396            const_cast<float&>(dev->device.ydpi) = m->ydpi;
397            const_cast<float&>(dev->device.fps) = m->fps;
398            const_cast<int&>(dev->device.minSwapInterval) =
399                                                        PRIV_MIN_SWAP_INTERVAL;
400            const_cast<int&>(dev->device.maxSwapInterval) =
401                                                        PRIV_MAX_SWAP_INTERVAL;
402            const_cast<int&>(dev->device.numFramebuffers) = m->numBuffers;
403            dev->device.setUpdateRect = 0;
404
405            *device = &dev->device.common;
406        }
407
408        // Close the gralloc module
409        gralloc_close(gralloc_device);
410    }
411    return status;
412}
413