[Intel-gfx] [PATCH] sna: check for LLC support

[Eugeni Dodonov]

Instead of checking for CPU generation, use the libdrm-provided
I915_PARAM_HAS_LLC instead.

v2: use a define check to verify if we have I915_PARAM_HAS_LLC.

Signed-off-by: Eugeni Dodonov eugeni.dodo...@intel.com
---
 src/sna/kgem.c |   12 
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/src/sna/kgem.c b/src/sna/kgem.c
index 970e462..aa9029d 100644
--- a/src/sna/kgem.c
+++ b/src/sna/kgem.c
@@ -603,8 +603,20 @@ void kgem_init(struct kgem *kgem, int fd, struct 
pci_device *dev, int gen)
 kgem-has_relaxed_fencing));
 
kgem-has_llc = false;
+#ifdef I915_PARAM_HAS_LLC
+   if (!DBG_NO_LLC)
+   kgem-has_llc = gem_param(kgem, I915_PARAM_HAS_LLC);
+#else
+   /* If I915_PARAM_HAS_LLC is not defined by the libdrm, fallback
+* to previous GPU generation check and assume that GPUs superior
+* to Gen6 support it.
+*/
+   DBG((%s: libdrm does not provides I915_PARAM_HAS_LLC, detect GPU gen 
instead\n,
+   __FUNCTION__));
if (!DBG_NO_LLC  gen = 60)
kgem-has_llc = true;
+#endif
+
kgem-has_cpu_bo = kgem-has_llc;
DBG((%s: cpu bo enabled %d: llc? %d\n, __FUNCTION__,
 kgem-has_cpu_bo, kgem-has_llc));
-- 
1.7.8.3

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Re: [Intel-gfx] [PATCH] sna: check for LLC support

[Chris Wilson]

On Tue, 17 Jan 2012 16:16:37 -0200, Eugeni Dodonov eugeni.dodo...@intel.com 
wrote:
 Instead of checking for CPU generation, use the libdrm-provided
 I915_PARAM_HAS_LLC instead.
 
 v2: use a define check to verify if we have I915_PARAM_HAS_LLC.
 
 Signed-off-by: Eugeni Dodonov eugeni.dodo...@intel.com

I attacked it slightly so that gem_param reported the lack of support so
that we could fallback to guessing by gen for GET_PARAM failure.
Thanks,
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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