gralloc: Clean pmem caches after memset

Change-Id: If403dde70863e0d6ea221f2a105b86bdec134261

libgralloc-qsd8k/gralloc.cpp

@@ -108,6 +108,14 @@ class PmemAllocatorDepsDeviceImpl : public PmemUserspaceAllocator::Deps,
         return ioctl(fd, PMEM_ALLOCATE_ALIGNED, &allocation);
     }
 
+    virtual int cleanPmem(int fd, unsigned long base, int offset, size_t size) {
+        struct pmem_addr pmem_addr;
+        pmem_addr.vaddr = base;
+        pmem_addr.offset = offset;
+        pmem_addr.length = size;
+        return ioctl(fd, PMEM_CLEAN_INV_CACHES, &pmem_addr);
+    }
+
     virtual int getErrno() {
         return errno;
     }

libgralloc-qsd8k/pmemalloc.cpp

@@ -181,6 +181,8 @@ int PmemUserspaceAllocator::alloc_pmem_buffer(size_t size, int usage,
             } else {
                 LOGV("%s: mapped fd %d at offset %d, size %d", pmemdev, fd, offset, size);
                 memset((char*)base + offset, 0, size);
+                //Clean cache before flushing to ensure pmem is properly flushed
+                deps.cleanPmem(fd, (unsigned long) base, offset, size);
 #ifdef HOST
                  cacheflush(intptr_t(base) + offset, intptr_t(base) + offset + size, 0);
 #endif

libgralloc-qsd8k/pmemalloc.h

@@ -69,6 +69,7 @@ class PmemUserspaceAllocator: public PmemAllocator {
         virtual int connectPmem(int fd, int master_fd) = 0;
         virtual int mapPmem(int fd, int offset, size_t size) = 0;
         virtual int unmapPmem(int fd, int offset, size_t size) = 0;
+        virtual int cleanPmem(int fd, unsigned long base, int offset, size_t size) = 0;
 
         // C99
         virtual int getErrno() = 0;