[Intel-gfx] [PATCH 1/1] drm/i915: Initialize pm_intr_keep during intel_irq_init for GuC
Sagar Arun Kamble
sagar.a.kamble at intel.com
Tue Mar 7 04:52:35 UTC 2017
Driver needs to ensure that it doesn't mask the PM interrupts, which are
unmasked/needed by GuC firmware. For that, Driver maintains a bitmask of
interrupts to be kept unmasked, pm_intr_keep.
pm_intr_keep was determined across GuC load. GuC gets loaded in different
scenarios and it is not going to change the pm_intr_keep so this patch
moves its setup to intel_irq_init.
This patch fixes incorrect RPS masking leading to UP interrupts triggered
even when at cur_freq=max and inversly for Down interrupts.
Cc: Radoslaw Szwichtenberg <radoslaw.szwichtenberg at intel.com>
Cc: Arkadiusz Hiler <arkadiusz.hiler at intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Michal Winiarski <michal.winiarski at intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_irq.c | 24 ++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_reg.h | 3 ++-
drivers/gpu/drm/i915/intel_guc_loader.c | 26 --------------------------
3 files changed, 26 insertions(+), 27 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index df95733..22ac703 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -4301,6 +4301,30 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
if (INTEL_INFO(dev_priv)->gen >= 8)
dev_priv->rps.pm_intr_keep |= GEN8_PMINTR_REDIRECT_TO_GUC;
+ /*
+ * The REDIRECT_TO_GUC bit of the PMINTRMSK register directs all
+ * (unmasked) PM interrupts to the GuC. All other bits of this
+ * register *disable* generation of a specific interrupt.
+ *
+ * 'pm_intr_keep' indicates bits that are NOT to be set when
+ * writing to the PM interrupt mask register, i.e. interrupts
+ * that must not be disabled.
+ *
+ * If the GuC is handling these interrupts, then we must not let
+ * the PM code disable ANY interrupt that the GuC is expecting.
+ * So for each ENABLED (0) bit in this register, we must SET the
+ * bit in pm_intr_keep so that it's left enabled for the GuC.
+ * GuC needs ARAT expired interrupt unmasked hence it is set in
+ * pm_intr_keep.
+ *
+ * Here we CLEAR REDIRECT_TO_GUC bit in pm_intr_keep, which will
+ * result in the register bit being left SET!
+ */
+ if (HAS_GUC_SCHED(dev_priv)) {
+ dev_priv->rps.pm_intr_keep |= ARAT_EXPIRED_INTRMSK;
+ dev_priv->rps.pm_intr_keep &= ~GEN8_PMINTR_REDIRECT_TO_GUC;
+ }
+
if (IS_GEN2(dev_priv)) {
/* Gen2 doesn't have a hardware frame counter */
dev->max_vblank_count = 0;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index cc843f9..19d42e8 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7453,7 +7453,8 @@ enum {
#define VLV_RCEDATA _MMIO(0xA0BC)
#define GEN6_RC6pp_THRESHOLD _MMIO(0xA0C0)
#define GEN6_PMINTRMSK _MMIO(0xA168)
-#define GEN8_PMINTR_REDIRECT_TO_GUC (1<<31)
+#define GEN8_PMINTR_REDIRECT_TO_GUC (1<<31)
+#define ARAT_EXPIRED_INTRMSK (1<<9)
#define GEN8_MISC_CTRL0 _MMIO(0xA180)
#define VLV_PWRDWNUPCTL _MMIO(0xA294)
#define GEN9_MEDIA_PG_IDLE_HYSTERESIS _MMIO(0xA0C4)
diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index 9885f76..64cdef4 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -114,7 +114,6 @@ static void guc_interrupts_capture(struct drm_i915_private *dev_priv)
struct intel_engine_cs *engine;
enum intel_engine_id id;
int irqs;
- u32 tmp;
/* tell all command streamers to forward interrupts (but not vblank) to GuC */
irqs = _MASKED_BIT_ENABLE(GFX_INTERRUPT_STEERING);
@@ -128,31 +127,6 @@ static void guc_interrupts_capture(struct drm_i915_private *dev_priv)
I915_WRITE(GUC_BCS_RCS_IER, ~irqs);
I915_WRITE(GUC_VCS2_VCS1_IER, ~irqs);
I915_WRITE(GUC_WD_VECS_IER, ~irqs);
-
- /*
- * The REDIRECT_TO_GUC bit of the PMINTRMSK register directs all
- * (unmasked) PM interrupts to the GuC. All other bits of this
- * register *disable* generation of a specific interrupt.
- *
- * 'pm_intr_keep' indicates bits that are NOT to be set when
- * writing to the PM interrupt mask register, i.e. interrupts
- * that must not be disabled.
- *
- * If the GuC is handling these interrupts, then we must not let
- * the PM code disable ANY interrupt that the GuC is expecting.
- * So for each ENABLED (0) bit in this register, we must SET the
- * bit in pm_intr_keep so that it's left enabled for the GuC.
- *
- * OTOH the REDIRECT_TO_GUC bit is initially SET in pm_intr_keep
- * (so interrupts go to the DISPLAY unit at first); but here we
- * need to CLEAR that bit, which will result in the register bit
- * being left SET!
- */
- tmp = I915_READ(GEN6_PMINTRMSK);
- if (tmp & GEN8_PMINTR_REDIRECT_TO_GUC) {
- dev_priv->rps.pm_intr_keep |= ~tmp;
- dev_priv->rps.pm_intr_keep &= ~GEN8_PMINTR_REDIRECT_TO_GUC;
- }
}
static u32 get_gttype(struct drm_i915_private *dev_priv)
--
1.9.1
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