[Mesa-dev] [PATCH 1/2] intel: verify if hardware has LLC support

[Eugeni Dodonov]

Rely on libdrm HAS_LLC parameter to verify if hardware supports it. In
case the libdrm version does not supports this check, fallback to older
way of detecting it which assumed that GPUs newer than GEN6 have it.

Signed-off-by: Eugeni Dodonov <eugeni.dodonov at intel.com>
---
 src/mesa/drivers/dri/intel/intel_context.c |    1 +
 src/mesa/drivers/dri/intel/intel_context.h |    1 +
 src/mesa/drivers/dri/intel/intel_screen.c  |    8 ++++++++
 src/mesa/drivers/dri/intel/intel_screen.h  |    2 ++
 4 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
index 81ba6a1..377bcbc 100644
--- a/src/mesa/drivers/dri/intel/intel_context.c
+++ b/src/mesa/drivers/dri/intel/intel_context.c
@@ -628,6 +628,7 @@ intelInitContext(struct intel_context *intel,
    intel->has_separate_stencil = intel->intelScreen->hw_has_separate_stencil;
    intel->must_use_separate_stencil = intel->intelScreen->hw_must_use_separate_stencil;
    intel->has_hiz = intel->intelScreen->hw_has_hiz;
+   intel->has_llc = intel->intelScreen->hw_has_llc;
 
    memset(&ctx->TextureFormatSupported,
 	  0, sizeof(ctx->TextureFormatSupported));
diff --git a/src/mesa/drivers/dri/intel/intel_context.h b/src/mesa/drivers/dri/intel/intel_context.h
index 4d4e030..150e55f 100644
--- a/src/mesa/drivers/dri/intel/intel_context.h
+++ b/src/mesa/drivers/dri/intel/intel_context.h
@@ -213,6 +213,7 @@ struct intel_context
    bool has_separate_stencil;
    bool must_use_separate_stencil;
    bool has_hiz;
+   bool has_llc;
 
    int urb_size;
 
diff --git a/src/mesa/drivers/dri/intel/intel_screen.c b/src/mesa/drivers/dri/intel/intel_screen.c
index 063bbe7..60781e5 100644
--- a/src/mesa/drivers/dri/intel/intel_screen.c
+++ b/src/mesa/drivers/dri/intel/intel_screen.c
@@ -735,6 +735,14 @@ __DRIconfig **intelInitScreen2(__DRIscreen *psp)
    intelScreen->hw_has_hiz = intelScreen->gen >= 6;
    intelScreen->dri2_has_hiz = INTEL_DRI2_HAS_HIZ_UNKNOWN;
 
+#if defined(I915_PARAM_HAS_LLC)
+   intelScreen->hw_has_llc =
+      intel_get_boolean(intelScreen->driScrnPriv,
+              I915_PARAM_HAS_LLC);
+#else
+   intelScreen->hw_has_llc = intelScreen->gen >= 6;
+#endif
+
    intel_override_hiz(intelScreen);
    intel_override_separate_stencil(intelScreen);
 
diff --git a/src/mesa/drivers/dri/intel/intel_screen.h b/src/mesa/drivers/dri/intel/intel_screen.h
index 6c6b516..a6baf16 100644
--- a/src/mesa/drivers/dri/intel/intel_screen.h
+++ b/src/mesa/drivers/dri/intel/intel_screen.h
@@ -116,6 +116,8 @@ struct intel_screen
 
    bool kernel_has_gen7_sol_reset;
 
+   bool hw_has_llc;
+
    bool no_vbo;
    dri_bufmgr *bufmgr;
    struct _mesa_HashTable *named_regions;
-- 
1.7.8.4