From: Michel Dänzer <michel@tungstengraphics.com>
Date: Mon, 7 Aug 2006 10:33:57 +0000 (+1000)
Subject: drm: radeon: implement RADEON_PARAM_SCRATCH_OFFSET getparam
X-Git-Tag: v2.6.19-rc1~641^2~30
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=8624ecbf68e90e5a8124514a0b7f92767fb80a62;p=~emulex%2Finfiniband.git

drm: radeon: implement RADEON_PARAM_SCRATCH_OFFSET getparam

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

Signed-off-by: Dave Airlie <airlied@linux.ie>
---

diff --git a/drivers/char/drm/radeon_state.c b/drivers/char/drm/radeon_state.c
index 99589fe0032..0433ff80cb7 100644
--- a/drivers/char/drm/radeon_state.c
+++ b/drivers/char/drm/radeon_state.c
@@ -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;