@@ -1313,9 +1313,31 @@ extern void intel_display_print_error_state(struct seq_file *m,
} while (0)
+
+/* On SNB platform, before reading ring registers forcewake bit
+ * 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_wait_for_fifo(struct drm_i915_private *dev_priv);
+
+/* We give fast paths for the really cool registers */
+#define NEEDS_FORCE_WAKE(dev_priv, reg) \
+ (((dev_priv)->info->gen >= 6) && \
+ ((reg) < 0x40000) && \
+ ((reg) != FORCEWAKE) )
+
#define __i915_read(x, y) \
static inline u##x i915_read##x(struct drm_i915_private *dev_priv, u32 reg) { \
- u##x val = read##y(dev_priv->regs + reg); \
+ u##x val = 0; \
+ if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
+ __gen6_gt_force_wake_get(dev_priv); \
+ val = read##y(dev_priv->regs + reg); \
+ __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; \
}
@@ -1328,6 +1350,9 @@ __i915_read(64, q)
#define __i915_write(x, y) \
static inline void i915_write##x(struct drm_i915_private *dev_priv, u32 reg, u##x val) { \
trace_i915_reg_rw(true, reg, val, sizeof(val)); \
+ if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
+ __gen6_gt_wait_for_fifo(dev_priv); \
+ } \
write##y(val, dev_priv->regs + reg); \
}
__i915_write(8, b)
@@ -1356,33 +1381,4 @@ __i915_write(64, q)
#define POSTING_READ16(reg) (void)I915_READ16_NOTRACE(reg)
-/* On SNB platform, before reading ring registers forcewake bit
- * 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_wait_for_fifo(struct drm_i915_private *dev_priv);
-
-static inline u32 i915_gt_read(struct drm_i915_private *dev_priv, u32 reg)
-{
- u32 val;
-
- if (dev_priv->info->gen >= 6) {
- __gen6_gt_force_wake_get(dev_priv);
- val = I915_READ(reg);
- __gen6_gt_force_wake_put(dev_priv);
- } else
- val = I915_READ(reg);
-
- return val;
-}
-
-static inline void i915_gt_write(struct drm_i915_private *dev_priv,
- u32 reg, u32 val)
-{
- if (dev_priv->info->gen >= 6)
- __gen6_gt_wait_for_fifo(dev_priv);
- I915_WRITE(reg, val);
-}
#endif
@@ -14,8 +14,8 @@ struct intel_hw_status_page {
struct drm_i915_gem_object *obj;
};
-#define I915_RING_READ(reg) i915_gt_read(dev_priv, reg)
-#define I915_RING_WRITE(reg, val) i915_gt_write(dev_priv, reg, val)
+#define I915_RING_READ(reg) I915_READ(reg)
+#define I915_RING_WRITE(reg, val) I915_WRITE(reg, val)
#define I915_READ_TAIL(ring) I915_RING_READ(RING_TAIL((ring)->mmio_base))
#define I915_WRITE_TAIL(ring, val) I915_RING_WRITE(RING_TAIL((ring)->mmio_base), val)
Moved the macros around to properly do reads and writes for the given gpu. This is to address special requirements for gen6 (SNB) reads and writes. Signed-off-by: Ben Widawsky <ben@bwidawsk.net> --- drivers/gpu/drm/i915/i915_drv.h | 56 ++++++++++++++---------------- drivers/gpu/drm/i915/intel_ringbuffer.h | 4 +- 2 files changed, 28 insertions(+), 32 deletions(-)