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i965: Store the GPU revision number in brw_context 

brwContextInit now queries the GPU revision number via a new parameter
for DRM_I915_GETPARAM. This new parameter requires a kernel patch and
a patch to libdrm. If the kernel doesn't support it then it will
continue but set the revision number to -1. The intention is to use
this to implement workarounds that are only needed on certain
steppings of the GPU.

Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>
This commit is contained in:
Neil Roberts 2015-03-04 14:13:40 +00:00
parent 2fd21d8a84
commit c02c4b567c
3 changed files with 24 additions and 1 deletions
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2
configure.ac
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@ -61,7 +61,7 @@ AC_SUBST([OSMESA_VERSION])
dnl Versions for external dependencies
LIBDRM_REQUIRED=2.4.38
LIBDRM_RADEON_REQUIRED=2.4.56
LIBDRM_INTEL_REQUIRED=2.4.52
LIBDRM_INTEL_REQUIRED=2.4.60
LIBDRM_NVVIEUX_REQUIRED=2.4.33
LIBDRM_NOUVEAU_REQUIRED="2.4.33 libdrm >= 2.4.41"
LIBDRM_FREEDRENO_REQUIRED=2.4.57

19
src/mesa/drivers/dri/i965/brw_context.c
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@ -658,6 +658,24 @@ brw_process_driconf_options(struct brw_context *brw)
driQueryOptionb(options, "allow_glsl_extension_directive_midshader");
}
static int
brw_get_revision(int fd)
{
struct drm_i915_getparam gp;
int revision;
int ret;
memset(&gp, 0, sizeof(gp));
gp.param = I915_PARAM_REVISION;
gp.value = &revision;
ret = drmCommandWriteRead(fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
if (ret)
revision = -1;
return revision;
}
GLboolean
brwCreateContext(gl_api api,
const struct gl_config *mesaVis,
@ -716,6 +734,7 @@ brwCreateContext(gl_api api,
brw->has_negative_rhw_bug = devinfo->has_negative_rhw_bug;
brw->needs_unlit_centroid_workaround =
devinfo->needs_unlit_centroid_workaround;
brw->revision = brw_get_revision(sPriv->fd);
brw->must_use_separate_stencil = screen->hw_must_use_separate_stencil;
brw->has_swizzling = screen->hw_has_swizzling;

4
src/mesa/drivers/dri/i965/brw_context.h
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@ -1076,6 +1076,10 @@ struct brw_context
int gen;
int gt;
/* GT revision. This will be -1 if the revision couldn't be determined (eg,
* if the kernel doesn't support the query).
*/
int revision;
bool is_g4x;
bool is_baytrail;