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vcdbg: Use dma driver to access gpu memory

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This commit is contained in:
popcornmix
2016-11-14 16:01:04 +00:00
parent 95b306cca4
commit 2165408c7f
2 changed files with 45 additions and 0 deletions
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44
host_applications/linux/libs/debug_sym/debug_sym.c
View File

@@ -139,6 +139,40 @@ int OpenVideoCoreMemory( VC_MEM_ACCESS_HANDLE_T *vcHandlePtr )
*
***************************************************************************/
struct fb_dmacopy {
uint32_t dst;
uint32_t src;
uint32_t length;
};
#define FBIODMACOPY _IOW('z', 0x22, struct fb_dmacopy)
static int vc_mem_copy(uint32_t dst, uint32_t src, uint32_t length)
{
const char *filename = "/dev/fb0";
int memFd;
struct fb_dmacopy ioparam;
ioparam.dst = dst;
ioparam.src = src;
ioparam.length = length;
if (( memFd = open( filename, O_RDWR | O_SYNC )) < 0 )
{
ERR( "Unable to open '%s': %s(%d)\n", filename, strerror( errno ), errno );
return -errno;
}
if ( ioctl( memFd, FBIODMACOPY, &ioparam ) != 0 )
{
ERR( "Failed to get memory size via ioctl: %s(%d)\n",
strerror( errno ), errno );
close( memFd );
return -errno;
}
close( memFd );
return 0;
}
int OpenVideoCoreMemoryFile( const char *filename, VC_MEM_ACCESS_HANDLE_T *vcHandlePtr )
{
return OpenVideoCoreMemoryFileWithOffset( filename, vcHandlePtr, 0 );
@@ -533,6 +567,7 @@ static int AccessVideoCoreMemory( VC_MEM_ACCESS_HANDLE_T vcHandle,
VC_MEM_ADDR_T vcMemAddr,
size_t numBytes )
{
VC_MEM_ADDR_T origVcMemAddr = vcMemAddr;
DBG( "%s %zu bytes @ 0x%08x", mem_op == WRITE_MEM ? "Write" : "Read", numBytes, vcMemAddr );
/*
@@ -587,6 +622,15 @@ static int AccessVideoCoreMemory( VC_MEM_ACCESS_HANDLE_T vcHandle,
return 0;
}
#else
// DMA allows memory to be accessed above 1008M and is more coherent so try this first
if (mem_op == READ_MEM)
{
DBG( "AccessVideoCoreMemory: %p, %x, %d", buf, origVcMemAddr, numBytes );
int s = vc_mem_copy((uint32_t)buf, (uint32_t)origVcMemAddr, numBytes);
if (s == 0)
return 1;
}
{
uint8_t *mapAddr;
size_t mapSize;

1
host_support/include/vc_mem.h
View File

@@ -35,6 +35,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#define VC_MEM_IOC_MEM_SIZE _IOR( VC_MEM_IOC_MAGIC, 1, unsigned int )
#define VC_MEM_IOC_MEM_BASE _IOR( VC_MEM_IOC_MAGIC, 2, unsigned int )
#define VC_MEM_IOC_MEM_LOAD _IOR( VC_MEM_IOC_MAGIC, 3, unsigned int )
#define VC_MEM_IOC_MEM_COPY _IOWR( VC_MEM_IOC_MAGIC, 4, char *)
#if defined( __KERNEL__ )
#define VC_MEM_TO_ARM_ADDR_MASK 0x3FFFFFFF