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drm: radeon: implement RADEON_PARAM_SCRATCH_OFFSET getparam

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When this succeeds, userspace can read the scratch register contents from th    mapped writeback page directly.

Signed-off-by: Dave Airlie <airlied@linux.ie>
This commit is contained in:
Michel Dänzer 2006-08-07 20:33:57 +10:00 committed by Dave Airlie
parent 9ca941615e
commit 8624ecbf68
1 changed files with 5 additions and 1 deletions
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6
drivers/char/drm/radeon_state.c
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@ -2987,7 +2987,11 @@ static int radeon_cp_getparam(DRM_IOCTL_ARGS)
case RADEON_PARAM_GART_TEX_HANDLE:
value = dev_priv->gart_textures_offset;
break;
case RADEON_PARAM_SCRATCH_OFFSET:
if (!dev_priv->writeback_works)
return DRM_ERR(EINVAL);
value = RADEON_SCRATCH_REG_OFFSET;
break;
case RADEON_PARAM_CARD_TYPE:
if (dev_priv->flags & CHIP_IS_PCIE)
value = RADEON_CARD_PCIE;