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)
v4: split engine/other handling
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 | 102 ++++++++++++++++++++++------------------
drivers/gpu/drm/i915/i915_reg.h | 4 +-
2 files changed, 59 insertions(+), 47 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 27aee25429b7..f984bf12a0b6 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2732,47 +2732,9 @@ 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;
@@ -2799,7 +2761,57 @@ 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_other_irq_handler(struct drm_i915_private * const i915,
+ const u8 instance, const u16 iir)
+{
+ WARN_ONCE(1, "unhandled other interrupt instance=0x%x, iir=0x%x\n",
+ instance, iir);
+}
+
+static void
+gen11_engine_irq_handler(struct drm_i915_private * const i915,
+ const u8 class, const u8 instance, const u16 iir)
+{
+ struct intel_engine_cs *engine;
+
+ if (instance <= MAX_ENGINE_INSTANCE)
+ engine = i915->engine_class[class][instance];
+ else
+ engine = NULL;
+
+ if (likely(engine))
+ return gen8_cs_irq_handler(engine, iir);
+
+ WARN_ONCE(1, "unhandled engine interrupt class=0x%x, instance=0x%x\n",
+ class, instance);
+}
+
+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 intr = GEN11_INTR_ENGINE_INTR(identity);
+
+ if (unlikely(!intr)) {
+ DRM_ERROR("class=0x%x, instance=0x%x, intr expected!\n",
+ class, instance);
+ return;
+ }
+
+ if (class <= COPY_ENGINE_CLASS)
+ return gen11_engine_irq_handler(i915, class, instance, intr);
+
+ if (class == OTHER_CLASS)
+ return gen11_other_irq_handler(i915, instance, intr);
+
+ WARN_ONCE(1, "unknown interrupt class=0x%x, instance=0x%x, intr=0x%x\n",
+ class, instance, intr);
}
static void
@@ -2824,12 +2836,10 @@ 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 b2a2d8fbbc68..d4b5fba7a2dc 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6998,7 +6998,9 @@ 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_CLASS(x) (((x) & GENMASK(18, 16)) >> 16)
+#define GEN11_INTR_ENGINE_INSTANCE(x) (((x) & GENMASK(25, 20)) >> 20)
+#define GEN11_INTR_ENGINE_INTR(x) ((x) & 0xffff)
#define GEN11_INTR_IDENTITY_REG(x) _MMIO(0x190060 + (x * 4))
--
2.14.1
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