From: Michel Dänzer <michel@tungstengraphics.com>
Date: Wed, 19 Jul 2006 17:07:06 +0000 (+0200)
Subject: Implement RADEON_PARAM_SCRATCH_OFFSET getparam.
X-Git-Tag: libdrm-2.3.1~581
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e337eadcec9c1e2cf885167c076ab2407bd6c090;p=platform%2Fupstream%2Flibdrm.git

Implement RADEON_PARAM_SCRATCH_OFFSET getparam.

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

diff --git a/shared-core/radeon_state.c b/shared-core/radeon_state.c
index 2c169ac..58251dd 100644
--- a/shared-core/radeon_state.c
+++ b/shared-core/radeon_state.c
@@ -3025,6 +3025,11 @@ 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)