bybrooklyn/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-04-18 14:53:58 -04:00
Code Issues Packages Projects Releases Wiki Activity

drm/radeon: add VM CS parser support for async DMA on cayman/TN/SI

Browse Source 
Allows us to use async DMA from userspace.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2012-12-13 12:17:38 -05:00
parent d2ead3eaf8
commit cd459e525f
3 changed files with 118 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

111
drivers/gpu/drm/radeon/evergreen_cs.c
View File

@@ -3556,3 +3556,114 @@ int evergreen_ib_parse(struct radeon_device *rdev, struct radeon_ib *ib)
return ret;
}
/**
* evergreen_dma_ib_parse() - parse the DMA IB for VM
* @rdev: radeon_device pointer
* @ib: radeon_ib pointer
*
* Parses the DMA IB from the VM CS ioctl
* checks for errors. (Cayman-SI)
* Returns 0 for success and an error on failure.
**/
int evergreen_dma_ib_parse(struct radeon_device *rdev, struct radeon_ib *ib)
{
u32 idx = 0;
u32 header, cmd, count, tiled, new_cmd, misc;
do {
header = ib->ptr[idx];
cmd = GET_DMA_CMD(header);
count = GET_DMA_COUNT(header);
tiled = GET_DMA_T(header);
new_cmd = GET_DMA_NEW(header);
misc = GET_DMA_MISC(header);
switch (cmd) {
case DMA_PACKET_WRITE:
if (tiled)
idx += count + 7;
else
idx += count + 3;
break;
case DMA_PACKET_COPY:
if (tiled) {
if (new_cmd) {
switch (misc) {
case 0:
/* L2T, frame to fields */
idx += 10;
break;
case 1:
/* L2T, T2L partial */
idx += 12;
break;
case 3:
/* L2T, broadcast */
idx += 10;
break;
case 4:
/* L2T, T2L */
idx += 9;
break;
case 5:
/* T2T partial */
idx += 13;
break;
case 7:
/* L2T, broadcast */
idx += 10;
break;
default:
DRM_ERROR("bad DMA_PACKET_COPY misc %u\n", misc);
return -EINVAL;
}
} else {
switch (misc) {
case 0:
idx += 9;
break;
default:
DRM_ERROR("bad DMA_PACKET_COPY misc %u\n", misc);
return -EINVAL;
}
}
} else {
if (new_cmd) {
switch (misc) {
case 0:
/* L2L, byte */
idx += 5;
break;
case 1:
/* L2L, partial */
idx += 9;
break;
case 4:
/* L2L, dw, broadcast */
idx += 7;
break;
default:
DRM_ERROR("bad DMA_PACKET_COPY misc %u\n", misc);
return -EINVAL;
}
} else {
/* L2L, dw */
idx += 5;
}
}
break;
case DMA_PACKET_CONSTANT_FILL:
idx += 4;
break;
case DMA_PACKET_NOP:
idx += 1;
break;
default:
DRM_ERROR("Unknown packet type %d at %d !\n", cmd, idx);
return -EINVAL;
}
} while (idx < ib->length_dw);
return 0;
}