研究導向：
open camera過程中有些初始化設定引數需要從vendor層獲取，而vendor與hal隸屬於不同程序，通過ion機制設定共享記憶體來實現不同程序間資料共享，下面簡要介紹流程：
在初始化過程中hal層會通過socket將訊息傳送至vendor層-通知vendor map共享記憶體。
ion初始化過程：
//初始化m_pcapability-從vendor層拿到的camera相關初始化資料
mparameters.init(gcamcapability[mcameraid], mcamerahandle, this, this);
pthread_mutex_unlock(&m_parm_lock);/* mm-mc-fixstring8heapcorrupt-00+ */
mparameters.m_parm_lock_ptr = &m_parm_lock;/* mm-mc-fixstring8heapcorrupt-00+ */
alogi("opencamera: m_parm_lock_ptr = 0x%x", mparameters.m_parm_lock_ptr);/* mm-mc-fixstring8heapcorrupt-00+ */
mcameraopened = true;
gcameraopened = true;/* mm-cl-cts-testmulticamerarelease-00+ */
#ifdef use_arcsoft_feature
if ((null != marcsoft_feature)&&(mcameraid == 0))/* mm-mc-fixopencameracrash-00+ */
marcsoft_feature->imx214_module_source = gcamcapability[0]->fih_imx214_module_source;//mm-yw-get module source for hal-00
#endif
return no_error;
}int qcamera2hardwareinte***ce::initcapabilities(uint32_t cameraid,
mm_camera_vtbl_t *camerahandle)
return no_memory;
} else
mptr[i] = vaddr;
}if (rc == 0)
mbuffercount = count;
tracelogallocend((size * count));
return ok;
}int qcameramemory::alloc(int count, size_t size, unsigned int heap_id)
} else }}
tracelogallocend (size * (size_t)count);
return rc;
}int qcameramemory::alloconebuffer(qcamerameminfo &meminfo,
unsigned int heap_id, size_t size, bool cached)
memset(&alloc, 0, sizeof(alloc));
memset(&ion_info_fd, 0, sizeof(ion_info_fd));/* mm-mc-modifyionfdinitflow-00+ */
alloc.len = size;
/* to make it page size aligned */
alloc.len = (alloc.len + 4095u) & (~4095u);
alloc.align = 4096;
if (cached)
alloc.heap_id_mask = heap_id;
rc =ioctl(main_ion_fd, ion_ioc_alloc, &alloc);
if (rc < 0)
//memset(&ion_info_fd, 0, sizeof(ion_info_fd));/* mm-mc-modifyionfdinitflow-00- */
ion_info_fd.handle = alloc.handle;
rc =ioctl(main_ion_fd, ion_ioc_share, &ion_info_fd);
if (rc < 0)
meminfo.main_ion_fd = main_ion_fd;
meminfo.fd = ion_info_fd.fd;
meminfo.handle = ion_info_fd.handle;
meminfo.size = alloc.len;
meminfo.cached = cached;
meminfo.heap_id = heap_id;
cdbg_high("%s : ion buffer %lx with size %d allocated",
__func__, (unsigned long)meminfo.handle, meminfo.size);
return ok;
ion_map_failed:
memset(&handle_data, 0, sizeof(handle_data));
handle_data.handle = ion_info_fd.handle;
ioctl(main_ion_fd, ion_ioc_free, &handle_data);
ion_alloc_failed:
close(main_ion_fd);
ion_open_failed:
return no_memory;
}2、通過socket通知vendor對映相應共享記憶體用於程序間通訊：
refer: ion機制介紹
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