Hi,
On 3/12/2018 7:41 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.
add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-160 (-160)
Function old new delta
gen11_irq_handler 764 604 -160
Total: Before=1506953, After=1506793, chg -0.01%
v2: handle class/instance overflow correctly (Mika)
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>
Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_irq.c | 64 ++++++++++++++---------------------------
drivers/gpu/drm/i915/i915_reg.h | 2 ++
2 files changed, 23 insertions(+), 43 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 828f3104488c..49816d0a380b 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2733,47 +2733,9 @@ 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 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;
@@ -2800,7 +2762,7 @@ 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
@@ -2825,12 +2787,28 @@ 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);
+ const u32 ident = gen11_gt_engine_identity(i915,
+ bank, bit);
+ const u16 iir = ident & GEN11_INTR_ENGINE_MASK;
+ u8 class, instance;
+ struct intel_engine_cs *engine;
if (unlikely(!iir))
continue;
- gen11_gt_engine_irq_handler(i915, bank, bit, iir);
+ class = GEN11_INTR_ENGINE_CLASS(ident);
+ if (unlikely(class >= MAX_ENGINE_CLASS))
MAX_ENGINE_CLASS points to the last CLASS, so this should be
if (unlikely(class > MAX_ENGINE_CLASS))
as you originally had in the v1 of this patch.
(GuC interrupts will be reported with class = OTHER_CLASS).
+ continue;
+
+ instance = GEN11_INTR_ENGINE_INSTANCE(ident);
+ if (unlikely(instance >= MAX_ENGINE_INSTANCE))
+ continue;
+
Same here, MAX_ENGINE_INSTANCE is inclusive too.
That's why we have the GEM_WARN_ON's in intel_engine_setup().
+ engine = i915->engine_class[class][instance];
+ if (unlikely(!engine))
+ continue;
+
+ gen8_cs_irq_handler(engine, iir);
}
/* 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 e6a8c0ee7df1..065825290482 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7118,6 +7118,8 @@ enum {
#define GEN11_INTR_IDENTITY_REG1 _MMIO(0x190064)
#define GEN11_INTR_DATA_VALID (1 << 31)
#define GEN11_INTR_ENGINE_MASK (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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