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drm/i915: Initialize pm_intr_keep during intel_irq_init for GuC

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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@intel.com>
Cc: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Michal Winiarski <michal.winiarski@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1488862355-9768-1-git-send-email-sagar.a.kamble@intel.com
This commit is contained in:
Sagar Arun Kamble 2017-03-07 10:22:35 +05:30 committed by Chris Wilson
parent d38146b9ee
commit 9735b04d0c
3 changed files with 26 additions and 27 deletions
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24
drivers/gpu/drm/i915/i915_irq.c
View File

@ -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;

1
drivers/gpu/drm/i915/i915_reg.h
View File

@ -7454,6 +7454,7 @@ enum {
#define GEN6_RC6pp_THRESHOLD _MMIO(0xA0C0)
#define GEN6_PMINTRMSK _MMIO(0xA168)
#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)

26
drivers/gpu/drm/i915/intel_guc_loader.c
View File

@ -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)