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drm/i915/gt: Reorganise gen8+ interrupt handler 

We always use a deferred bottom-half (either tasklet or irq_work) for
processing the response to an interrupt which means we can recombine the
GT irq ack+handler into one. This simplicity is important in later
patches as we will need to handle and then ack multiple interrupt levels
before acking the GT and master interrupts.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200127231540.3302516-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-01-27 23:15:36 +00:00
parent 03d0ed8a8e
commit 6cc32f15f9
3 changed files with 35 additions and 52 deletions
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70
drivers/gpu/drm/i915/gt/intel_gt_irq.c
View File

@ -286,59 +286,49 @@ void gen6_gt_irq_handler(struct intel_gt *gt, u32 gt_iir)
gen7_parity_error_irq_handler(gt, gt_iir);
}
void gen8_gt_irq_ack(struct intel_gt *gt, u32 master_ctl, u32 gt_iir[4])
void gen8_gt_irq_handler(struct intel_gt *gt, u32 master_ctl)
{
void __iomem * const regs = gt->uncore->regs;
u32 iir;
if (master_ctl & (GEN8_GT_RCS_IRQ | GEN8_GT_BCS_IRQ)) {
gt_iir[0] = raw_reg_read(regs, GEN8_GT_IIR(0));
if (likely(gt_iir[0]))
raw_reg_write(regs, GEN8_GT_IIR(0), gt_iir[0]);
iir = raw_reg_read(regs, GEN8_GT_IIR(0));
if (likely(iir)) {
cs_irq_handler(gt->engine_class[RENDER_CLASS][0],
iir >> GEN8_RCS_IRQ_SHIFT);
cs_irq_handler(gt->engine_class[COPY_ENGINE_CLASS][0],
iir >> GEN8_BCS_IRQ_SHIFT);
raw_reg_write(regs, GEN8_GT_IIR(0), iir);
}
}
if (master_ctl & (GEN8_GT_VCS0_IRQ | GEN8_GT_VCS1_IRQ)) {
gt_iir[1] = raw_reg_read(regs, GEN8_GT_IIR(1));
if (likely(gt_iir[1]))
raw_reg_write(regs, GEN8_GT_IIR(1), gt_iir[1]);
}
if (master_ctl & (GEN8_GT_PM_IRQ | GEN8_GT_GUC_IRQ)) {
gt_iir[2] = raw_reg_read(regs, GEN8_GT_IIR(2));
if (likely(gt_iir[2]))
raw_reg_write(regs, GEN8_GT_IIR(2), gt_iir[2]);
iir = raw_reg_read(regs, GEN8_GT_IIR(1));
if (likely(iir)) {
cs_irq_handler(gt->engine_class[VIDEO_DECODE_CLASS][0],
iir >> GEN8_VCS0_IRQ_SHIFT);
cs_irq_handler(gt->engine_class[VIDEO_DECODE_CLASS][1],
iir >> GEN8_VCS1_IRQ_SHIFT);
raw_reg_write(regs, GEN8_GT_IIR(1), iir);
}
}
if (master_ctl & GEN8_GT_VECS_IRQ) {
gt_iir[3] = raw_reg_read(regs, GEN8_GT_IIR(3));
if (likely(gt_iir[3]))
raw_reg_write(regs, GEN8_GT_IIR(3), gt_iir[3]);
}
}
void gen8_gt_irq_handler(struct intel_gt *gt, u32 master_ctl, u32 gt_iir[4])
{
if (master_ctl & (GEN8_GT_RCS_IRQ | GEN8_GT_BCS_IRQ)) {
cs_irq_handler(gt->engine_class[RENDER_CLASS][0],
gt_iir[0] >> GEN8_RCS_IRQ_SHIFT);
cs_irq_handler(gt->engine_class[COPY_ENGINE_CLASS][0],
gt_iir[0] >> GEN8_BCS_IRQ_SHIFT);
}
if (master_ctl & (GEN8_GT_VCS0_IRQ | GEN8_GT_VCS1_IRQ)) {
cs_irq_handler(gt->engine_class[VIDEO_DECODE_CLASS][0],
gt_iir[1] >> GEN8_VCS0_IRQ_SHIFT);
cs_irq_handler(gt->engine_class[VIDEO_DECODE_CLASS][1],
gt_iir[1] >> GEN8_VCS1_IRQ_SHIFT);
}
if (master_ctl & GEN8_GT_VECS_IRQ) {
cs_irq_handler(gt->engine_class[VIDEO_ENHANCEMENT_CLASS][0],
gt_iir[3] >> GEN8_VECS_IRQ_SHIFT);
iir = raw_reg_read(regs, GEN8_GT_IIR(3));
if (likely(iir)) {
cs_irq_handler(gt->engine_class[VIDEO_ENHANCEMENT_CLASS][0],
iir >> GEN8_VECS_IRQ_SHIFT);
raw_reg_write(regs, GEN8_GT_IIR(3), iir);
}
}
if (master_ctl & (GEN8_GT_PM_IRQ | GEN8_GT_GUC_IRQ)) {
gen6_rps_irq_handler(&gt->rps, gt_iir[2]);
guc_irq_handler(&gt->uc.guc, gt_iir[2] >> 16);
iir = raw_reg_read(regs, GEN8_GT_IIR(2));
if (likely(iir)) {
gen6_rps_irq_handler(&gt->rps, iir);
guc_irq_handler(&gt->uc.guc, iir >> 16);
raw_reg_write(regs, GEN8_GT_IIR(2), iir);
}
}
}

3
drivers/gpu/drm/i915/gt/intel_gt_irq.h
View File

@ -36,9 +36,8 @@ void gen5_gt_enable_irq(struct intel_gt *gt, u32 mask);
void gen6_gt_irq_handler(struct intel_gt *gt, u32 gt_iir);
void gen8_gt_irq_ack(struct intel_gt *gt, u32 master_ctl, u32 gt_iir[4]);
void gen8_gt_irq_handler(struct intel_gt *gt, u32 master_ctl);
void gen8_gt_irq_reset(struct intel_gt *gt);
void gen8_gt_irq_handler(struct intel_gt *gt, u32 master_ctl, u32 gt_iir[4]);
void gen8_gt_irq_postinstall(struct intel_gt *gt);
#endif /* INTEL_GT_IRQ_H */

14
drivers/gpu/drm/i915/i915_irq.c
View File

@ -1614,7 +1614,6 @@ static irqreturn_t cherryview_irq_handler(int irq, void *arg)
u32 master_ctl, iir;
u32 pipe_stats[I915_MAX_PIPES] = {};
u32 hotplug_status = 0;
u32 gt_iir[4];
u32 ier = 0;
master_ctl = I915_READ(GEN8_MASTER_IRQ) & ~GEN8_MASTER_IRQ_CONTROL;
@ -1642,7 +1641,7 @@ static irqreturn_t cherryview_irq_handler(int irq, void *arg)
ier = I915_READ(VLV_IER);
I915_WRITE(VLV_IER, 0);
gen8_gt_irq_ack(&dev_priv->gt, master_ctl, gt_iir);
gen8_gt_irq_handler(&dev_priv->gt, master_ctl);
if (iir & I915_DISPLAY_PORT_INTERRUPT)
hotplug_status = i9xx_hpd_irq_ack(dev_priv);
@ -1666,8 +1665,6 @@ static irqreturn_t cherryview_irq_handler(int irq, void *arg)
I915_WRITE(VLV_IER, ier);
I915_WRITE(GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL);
gen8_gt_irq_handler(&dev_priv->gt, master_ctl, gt_iir);
if (hotplug_status)
i9xx_hpd_irq_handler(dev_priv, hotplug_status);
@ -2396,7 +2393,6 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
struct drm_i915_private *dev_priv = arg;
void __iomem * const regs = dev_priv->uncore.regs;
u32 master_ctl;
u32 gt_iir[4];
if (!intel_irqs_enabled(dev_priv))
return IRQ_NONE;
@ -2407,8 +2403,8 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
return IRQ_NONE;
}
/* Find, clear, then process each source of interrupt */
gen8_gt_irq_ack(&dev_priv->gt, master_ctl, gt_iir);
/* Find, queue (onto bottom-halves), then clear each source */
gen8_gt_irq_handler(&dev_priv->gt, master_ctl);
/* IRQs are synced during runtime_suspend, we don't require a wakeref */
if (master_ctl & ~GEN8_GT_IRQS) {
@ -2419,8 +2415,6 @@ static irqreturn_t gen8_irq_handler(int irq, void *arg)
gen8_master_intr_enable(regs);
gen8_gt_irq_handler(&dev_priv->gt, master_ctl, gt_iir);
return IRQ_HANDLED;
}
@ -2503,7 +2497,7 @@ __gen11_irq_handler(struct drm_i915_private * const i915,
return IRQ_NONE;
}
/* Find, clear, then process each source of interrupt. */
/* Find, queue (onto bottom-halves), then clear each source */
gen11_gt_irq_handler(gt, master_ctl);
/* IRQs are synced during runtime_suspend, we don't require a wakeref */