[Intel-gfx] [PATCH] drm/i915: Add I915_PARAM_REVISION

[Neil Roberts]

Adds a parameter which can be used with DRM_I915_GETPARAM to query the
GPU revision. The intention is to use this in Mesa to implement the
WaDisableSIMD16On3SrcInstr workaround on Skylake but only for
revision 2.

Signed-off-by: Neil Roberts <neil at linux.intel.com>
---
The corresponding Mesa patches are here:

http://lists.freedesktop.org/archives/mesa-dev/2015-March/078534.html

and the libdrm patch is here:

http://lists.freedesktop.org/archives/dri-devel/2015-March/078645.html

 drivers/gpu/drm/i915/i915_dma.c | 3 +++
 include/uapi/drm/i915_drm.h     | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 0312879..36dd1df 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -68,6 +68,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
 	case I915_PARAM_CHIPSET_ID:
 		value = dev->pdev->device;
 		break;
+	case I915_PARAM_REVISION:
+		value = dev->pdev->revision;
+		break;
 	case I915_PARAM_HAS_GEM:
 		value = 1;
 		break;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 6eed16b..b768f3b 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -347,6 +347,7 @@ typedef struct drm_i915_irq_wait {
 #define I915_PARAM_HAS_COHERENT_PHYS_GTT 29
 #define I915_PARAM_MMAP_VERSION          30
 #define I915_PARAM_HAS_BSD2		 31
+#define I915_PARAM_REVISION              32
 
 typedef struct drm_i915_getparam {
 	int param;
-- 
1.9.3