On 3/16/2018 5:14 AM, Mika Kuoppala wrote:
Interrupt identity register we already read from hardware
contains engine class and instance fields. Leverage
these fields to find correct engine to handle the interrupt.
v3: rebase on top of rps intr
use correct class / instance limits (Michel)
Suggested-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: Michel Thierry <michel.thierry@xxxxxxxxx>
Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_irq.c | 80 +++++++++++++++--------------------------
drivers/gpu/drm/i915/i915_reg.h | 4 ++-
2 files changed, 31 insertions(+), 53 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 8c4510ffe625..dd2fb2d0457f 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -413,8 +413,8 @@ static void gen6_disable_pm_irq(struct drm_i915_private *dev_priv, u32 disable_m
}
static u32
-gen11_gt_engine_intr(struct drm_i915_private * const i915,
- const unsigned int bank, const unsigned int bit);
+gen11_gt_engine_identity(struct drm_i915_private * const i915,
+ const unsigned int bank, const unsigned int bit);
void gen11_reset_rps_interrupts(struct drm_i915_private *dev_priv)
{
@@ -428,7 +428,7 @@ void gen11_reset_rps_interrupts(struct drm_i915_private *dev_priv)
*/
dw = I915_READ_FW(GEN11_GT_INTR_DW0);
while (dw & BIT(GEN11_GTPM)) {
- gen11_gt_engine_intr(dev_priv, 0, GEN11_GTPM);
+ gen11_gt_engine_identity(dev_priv, 0, GEN11_GTPM);
I915_WRITE_FW(GEN11_GT_INTR_DW0, BIT(GEN11_GTPM));
dw = I915_READ_FW(GEN11_GT_INTR_DW0);
}
@@ -2771,50 +2771,9 @@ static void __fini_wedge(struct wedge_me *w)
(W)->i915; \
__fini_wedge((W)))
-static void
-gen11_gt_engine_irq_handler(struct drm_i915_private * const i915,
- const unsigned int bank,
- const unsigned int engine_n,
- const u16 iir)
-{
- struct intel_engine_cs ** const engine = i915->engine;
-
- switch (bank) {
- case 0:
- switch (engine_n) {
-
- case GEN11_RCS0:
- return gen8_cs_irq_handler(engine[RCS], iir);
-
- case GEN11_BCS:
- return gen8_cs_irq_handler(engine[BCS], iir);
-
- case GEN11_GTPM:
- return gen6_rps_irq_handler(i915, iir);
- }
- case 1:
- switch (engine_n) {
-
- case GEN11_VCS(0):
- return gen8_cs_irq_handler(engine[_VCS(0)], iir);
- case GEN11_VCS(1):
- return gen8_cs_irq_handler(engine[_VCS(1)], iir);
- case GEN11_VCS(2):
- return gen8_cs_irq_handler(engine[_VCS(2)], iir);
- case GEN11_VCS(3):
- return gen8_cs_irq_handler(engine[_VCS(3)], iir);
-
- case GEN11_VECS(0):
- return gen8_cs_irq_handler(engine[_VECS(0)], iir);
- case GEN11_VECS(1):
- return gen8_cs_irq_handler(engine[_VECS(1)], iir);
- }
- }
-}
-
static u32
-gen11_gt_engine_intr(struct drm_i915_private * const i915,
- const unsigned int bank, const unsigned int bit)
+gen11_gt_engine_identity(struct drm_i915_private * const i915,
+ const unsigned int bank, const unsigned int bit)
{
void __iomem * const regs = i915->regs;
u32 timeout_ts;
@@ -2841,7 +2800,26 @@ gen11_gt_engine_intr(struct drm_i915_private * const i915,
raw_reg_write(regs, GEN11_INTR_IDENTITY_REG(bank),
GEN11_INTR_DATA_VALID);
- return ident & GEN11_INTR_ENGINE_MASK;
+ return ident;
+}
+
+static void
+gen11_gt_identity_handler(struct drm_i915_private * const i915,
+ const u32 identity)
+{
+ const u8 class = GEN11_INTR_ENGINE_CLASS(identity);
+ const u8 instance = GEN11_INTR_ENGINE_INSTANCE(identity);
+ const u16 iir = GEN11_INTR_ENGINE_MASK(identity);
+
+ if (unlikely(!iir))
+ return;
+
+ if (class <= MAX_ENGINE_CLASS && instance <= MAX_ENGINE_INSTANCE)
+ return gen8_cs_irq_handler(i915->engine_class[class][instance],
+ iir);
+
+ if (class == GEN11_GTPM)
+ return gen6_rps_irq_handler(i915, iir);
Hi,
GEN11_GTPM should be
[Class ID] == 'OTHER_CLASS (4)', and
[Engine Id] == 1.
(I'm looking at bspec 20944)
So not only the GPTM check needs to be before the
if (class <= MAX_ENGINE_CLASS),
but it can't use GEN11_GTPM either.
-Michel
}
static void
@@ -2866,12 +2844,10 @@ gen11_gt_irq_handler(struct drm_i915_private * const i915,
}
for_each_set_bit(bit, &intr_dw, 32) {
- const u16 iir = gen11_gt_engine_intr(i915, bank, bit);
-
- if (unlikely(!iir))
- continue;
+ const u32 ident = gen11_gt_engine_identity(i915,
+ bank, bit);
- gen11_gt_engine_irq_handler(i915, bank, bit, iir);
+ gen11_gt_identity_handler(i915, ident);
}
/* Clear must be after shared has been served for engine */
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index f3cc77690124..74a8f454e8a0 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6826,7 +6826,9 @@ enum {
#define GEN11_INTR_IDENTITY_REG0 _MMIO(0x190060)
#define GEN11_INTR_IDENTITY_REG1 _MMIO(0x190064)
#define GEN11_INTR_DATA_VALID (1 << 31)
-#define GEN11_INTR_ENGINE_MASK (0xffff)
+#define GEN11_INTR_ENGINE_MASK(x) ((x) & 0xffff)
+#define GEN11_INTR_ENGINE_CLASS(x) (((x) & GENMASK(18, 16)) >> 16)
+#define GEN11_INTR_ENGINE_INSTANCE(x) (((x) & GENMASK(25, 20)) >> 20)
#define GEN11_INTR_IDENTITY_REG(x) _MMIO(0x190060 + (x * 4))
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