sepolicy添加

1/2请修改 在android S  branch下

1.device/mediatek/sepolicy/basic/non_plat/hal_graphics_composer_default.te:
添加
get_prop(hal_graphics_composer_default, vendor_single_buf_waitnopf_prop)

2.device/mediatek/sepolicy/basic/public/property.te:
添加
system_public_prop(vendor_single_buf_waitnopf_prop)

3/4/5/6/7请修改 在android T  branch下

3.device/mediatek/sepolicy/base/private/surfaceflinger.te:
添加
get_prop(surfaceflinger, vendor_single_buf_waitnopf_prop)
set_prop(surfaceflinger, vendor_single_buf_waitnopf_prop)

4. device/mediatek/sepolicy/base/public/property.te:
添加
system_public_prop(vendor_single_buf_waitnopf_prop)

5. device/mediatek/sepolicy/base/private/property_contexts:
vendor.stylus.hwc.no_wait_pf u:object_r:vendor_single_buf_waitnopf_prop:s0 exact bool

6. device/mediatek/sepolicy/base/private/genfs_contexts:
genfscon bpf /tethering u:object_r:fs_bpf_net_shared:s0
----自动生成的，不用修改

7.device/mediatek/sepolicy/base/private/compat/31.0/31.0.cil
添加
(expandtypeattribute (vendor_single_buf_waitnopf_prop_31_0) true)
(typeattribute vendor_single_buf_waitnopf_prop_31_0)
(typeattributeset vendor_single_buf_waitnopf_prop_31_0 (vendor_single_buf_waitnopf_prop))

overlay 属性使用

#include <cutils/properties.h>
void OverlayEngine::waitAllFence(sp<FrameInfo>& info)
{
    char tag[128];
    DbgLogger logger(DbgLogger::TYPE_HWC_LOG, 'D', nullptr);
//BEGIN Lenovo, huyong6, 2023/02/03, INCEPTION-3065, single buffer
    char value[PROPERTY_VALUE_MAX];
    property_get("vendor.stylus.hwc.no_wait_pf", value, "0");
//END INCEPTION-3065
    logger.printf("(%" PRIu64 ") Wait present fence for idx: %d", m_disp_id, info->present_fence_idx);

    waitOverlayFence(info);

    if (info->prev_present_fence != -1)
    {

        if (HWCMediator::getInstance().getLowLatencyWFD() == true)
        {
            // status: active(0) signaled(1) error(<0)
            if (m_sync_fence->queryFenceStatus(info->prev_present_fence) == 0)
            {
               HWCMediator::getInstance().setRepaintAfterNextVsync();
            }
            else
            {
               HWCMediator::getInstance().setRepaintInNextVsync();
            }
        }
#ifdef FENCE_DEBUG
        HWC_LOGD("+ OverlayEngine::waitPresentFence prev_present_fence:%d", info->prev_present_fence);
#endif

//BEGIN Lenovo, huyong6, 2023/02/03, INCEPTION-3065, single buffer
        HWC_ATRACE_NAME("PF");
        if(atoi(value)==0)
        {
            //HWC_LOGE("isStylusTargetLayer OverlayEngine::stylus Close");
            if (!isUserLoad() && snprintf(tag, sizeof(tag), "%s-PF", DEBUG_LOG_TAG) > 0)
            {
                m_sync_fence->wait(info->prev_present_fence, 1000, tag);
            }
            else
            {
                m_sync_fence->wait(info->prev_present_fence, 1000, nullptr, SYNC_FENCE_PF, m_disp_id);
            }
        }
        else
        {
            //HWC_LOGE("isStylusTargetLayer OverlayEngine::stylus open");
            protectedClose(info->prev_present_fence);
        }
//END INCEPTION-3065

#ifdef FENCE_DEBUG
        HWC_LOGD("- OverlayEngine::waitPresentFence");
#endif
        info->prev_present_fence = -1;
    }

    if (info->pq_fence_fd != -1)
    {
        HWC_ATRACE_NAME("PQF");
        if (!isUserLoad() && snprintf(tag, sizeof(tag), "%s-PQF", DEBUG_LOG_TAG) > 0)
        {
            m_sync_fence->wait(info->pq_fence_fd, 1000, tag);
        }
        else
        {
            m_sync_fence->wait(info->pq_fence_fd, 1000, nullptr, SYNC_FENCE_PQ, m_disp_id);
        }
    }
}

SF侧使用

            property_set("vendor.stylus.hwc.no_wait_pf", "0");

sepolicy编译结果检查

请在 S branch out_hal/target/product/xxx/vendor/etc/selinux 下 grep  vendor.stylus.hwc.no_wait_pf
请在 T branch  out_sys/target/product/xxx/system/system_ext/etc/selinux 下 grep  vendor.stylus.hwc.no_wait_pf