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authorBen Widawsky <ben@bwidawsk.net>2011-04-25 11:23:07 -0700
committerKeith Packard <keithp@keithp.com>2011-05-10 13:56:46 -0700
commitfcca7926299944841569515da321bef9655b7703 (patch)
tree3d3961db5e3d1821bd68c3c09365f9e557e61d55 /drivers/gpu/drm/i915/i915_drv.h
parentb7287d8054d219b3009f7ca82edf24f89fd363e5 (diff)
drm/i915: reference counted forcewake
Provide a reference count to track the forcewake state of the GPU and give a safe mechanism for userspace to wake the GT. This also potentially saves a UC read if the GT is known to be awake already. The reference count is atomic, but the register access and hardware wake sequence is protected by struct_mutex. Signed-off-by: Ben Widawsky <ben@bwidawsk.net> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_drv.h')
-rw-r--r--drivers/gpu/drm/i915/i915_drv.h11
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 083644ef8f3..bafb387dd41 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -709,6 +709,8 @@ typedef struct drm_i915_private {
struct intel_fbdev *fbdev;
struct drm_property *broadcast_rgb_property;
+
+ atomic_t forcewake_count;
} drm_i915_private_t;
enum i915_cache_level {
@@ -1329,8 +1331,8 @@ extern void intel_display_print_error_state(struct seq_file *m,
* must be set to prevent GT core from power down and stale values being
* returned.
*/
-void __gen6_gt_force_wake_get(struct drm_i915_private *dev_priv);
-void __gen6_gt_force_wake_put(struct drm_i915_private *dev_priv);
+void gen6_gt_force_wake_get(struct drm_i915_private *dev_priv);
+void gen6_gt_force_wake_put(struct drm_i915_private *dev_priv);
void __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv);
/* We give fast paths for the really cool registers */
@@ -1343,15 +1345,16 @@ void __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv);
static inline u##x i915_read##x(struct drm_i915_private *dev_priv, u32 reg) { \
u##x val = 0; \
if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
- __gen6_gt_force_wake_get(dev_priv); \
+ gen6_gt_force_wake_get(dev_priv); \
val = read##y(dev_priv->regs + reg); \
- __gen6_gt_force_wake_put(dev_priv); \
+ gen6_gt_force_wake_put(dev_priv); \
} else { \
val = read##y(dev_priv->regs + reg); \
} \
trace_i915_reg_rw(false, reg, val, sizeof(val)); \
return val; \
}
+
__i915_read(8, b)
__i915_read(16, w)
__i915_read(32, l)