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sna: Support efficient cursor updates for old machines 

Given a kernel patch to fix coherency of physical objects, we can use a
more efficient method for updating cursors.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2014-04-17 21:04:15 +01:00
parent ee7d2e0a8e
commit 1217dbc88e
1 changed files with 14 additions and 1 deletions
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15
src/sna/sna_display.c
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@ -4366,6 +4366,7 @@ sna_cursor_pre_init(struct sna *sna)
uint64_t name;
uint64_t value;
} cap;
int v;
if (sna->mode.num_real_crtc == 0)
return;
@ -4374,6 +4375,8 @@ sna_cursor_pre_init(struct sna *sna)
#define DRM_CAP_CURSOR_WIDTH 8
#define DRM_CAP_CURSOR_HEIGHT 9
#define I915_PARAM_HAS_COHERENT_PHYS_GTT 29
sna->cursor.max_size = 64;
cap.value = 0;
@ -4387,7 +4390,17 @@ sna_cursor_pre_init(struct sna *sna)
assert(sna->cursor.max_size == cap.value);
#endif
sna->cursor.use_gtt = sna->kgem.gen >= 033;
v = -1; /* No param uses the sign bit, reserve it for errors */
if (sna->kgem.gen >= 033) {
v = 1;
} else {
drm_i915_getparam_t gp = {
I915_PARAM_HAS_COHERENT_PHYS_GTT,
&v,
};
(void)drmIoctl(sna->kgem.fd, DRM_IOCTL_I915_GETPARAM, &gp);
}
sna->cursor.use_gtt = v > 0;
DBG(("%s: cursor updates use_gtt?=%d\n",
__FUNCTION__, sna->cursor.use_gtt));