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| author | Ben Widawsky <ben@bwidawsk.net> | 2011-04-25 11:23:07 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2011-05-10 13:56:46 -0700 |
| commit | fcca7926299944841569515da321bef9655b7703 (patch) | |
| tree | 3d3961db5e3d1821bd68c3c09365f9e557e61d55 /drivers/gpu/drm/i915/i915_drv.h | |
| parent | b7287d8054d219b3009f7ca82edf24f89fd363e5 (diff) | |
| download | lwn-fcca7926299944841569515da321bef9655b7703.tar.gz lwn-fcca7926299944841569515da321bef9655b7703.zip | |
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.h | 11 |
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 083644ef8f31..bafb387dd416 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) |