On Thu, Oct 27, 2022 at 03:15:52PM -0700, Daniele Ceraolo Spurio wrote:
> The GSC CS re-uses the same interrupt bits that the GSC used in older
> platforms. This means that we can now have an engine interrupt coming
> out of OTHER_CLASS, so we need to handle that appropriately.
>
> Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospu...@intel.com>
> Cc: Matt Roper <matthew.d.ro...@intel.com>
Reviewed-by: Matt Roper <matthew.d.ro...@intel.com>
> ---
> drivers/gpu/drm/i915/gt/intel_gt_irq.c | 78 ++++++++++++++------------
> 1 file changed, 43 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_irq.c
> b/drivers/gpu/drm/i915/gt/intel_gt_irq.c
> index f26882fdc24c..34ff1ee7e931 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_irq.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_irq.c
> @@ -81,35 +81,27 @@ gen11_other_irq_handler(struct intel_gt *gt, const u8
> instance,
> instance, iir);
> }
>
> -static void
> -gen11_engine_irq_handler(struct intel_gt *gt, const u8 class,
> - const u8 instance, const u16 iir)
> +static struct intel_gt *pick_gt(struct intel_gt *gt, u8 class, u8 instance)
> {
> - struct intel_engine_cs *engine;
> -
> - /*
> - * Platforms with standalone media have their media engines in another
> - * GT.
> - */
> - if (MEDIA_VER(gt->i915) >= 13 &&
> - (class == VIDEO_DECODE_CLASS || class == VIDEO_ENHANCEMENT_CLASS)) {
> - if (!gt->i915->media_gt)
> - goto err;
> + struct intel_gt *media_gt = gt->i915->media_gt;
>
> - gt = gt->i915->media_gt;
> + /* we expect the non-media gt to be passed in */
> + GEM_BUG_ON(gt == media_gt);
> +
> + if (!media_gt)
> + return gt;
> +
> + switch (class) {
> + case VIDEO_DECODE_CLASS:
> + case VIDEO_ENHANCEMENT_CLASS:
> + return media_gt;
> + case OTHER_CLASS:
> + if (instance == OTHER_GSC_INSTANCE && HAS_ENGINE(media_gt,
> GSC0))
> + return media_gt;
> + fallthrough;
> + default:
> + return gt;
> }
> -
> - if (instance <= MAX_ENGINE_INSTANCE)
> - engine = gt->engine_class[class][instance];
> - else
> - engine = NULL;
> -
> - if (likely(engine))
> - return intel_engine_cs_irq(engine, iir);
> -
> -err:
> - WARN_ONCE(1, "unhandled engine interrupt class=0x%x, instance=0x%x\n",
> - class, instance);
> }
>
> static void
> @@ -118,12 +110,24 @@ gen11_gt_identity_handler(struct intel_gt *gt, 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);
> + struct intel_engine_cs *engine;
>
> if (unlikely(!intr))
> return;
>
> - if (class <= COPY_ENGINE_CLASS || class == COMPUTE_CLASS)
> - return gen11_engine_irq_handler(gt, class, instance, intr);
> + /*
> + * Platforms with standalone media have the media and GSC engines in
> + * another GT.
> + */
> + gt = pick_gt(gt, class, instance);
> +
> + if (class <= MAX_ENGINE_CLASS && instance <= MAX_ENGINE_INSTANCE)
> + engine = gt->engine_class[class][instance];
> + else
> + engine = NULL;
> +
> + if (engine)
> + return intel_engine_cs_irq(engine, intr);
>
> if (class == OTHER_CLASS)
> return gen11_other_irq_handler(gt, instance, intr);
> @@ -206,7 +210,7 @@ void gen11_gt_irq_reset(struct intel_gt *gt)
> intel_uncore_write(uncore, GEN11_VCS_VECS_INTR_ENABLE, 0);
> if (CCS_MASK(gt))
> intel_uncore_write(uncore, GEN12_CCS_RSVD_INTR_ENABLE, 0);
> - if (HAS_HECI_GSC(gt->i915))
> + if (HAS_HECI_GSC(gt->i915) || HAS_ENGINE(gt, GSC0))
> intel_uncore_write(uncore, GEN11_GUNIT_CSME_INTR_ENABLE, 0);
>
> /* Restore masks irqs on RCS, BCS, VCS and VECS engines. */
> @@ -233,7 +237,7 @@ void gen11_gt_irq_reset(struct intel_gt *gt)
> intel_uncore_write(uncore, GEN12_CCS0_CCS1_INTR_MASK, ~0);
> if (HAS_ENGINE(gt, CCS2) || HAS_ENGINE(gt, CCS3))
> intel_uncore_write(uncore, GEN12_CCS2_CCS3_INTR_MASK, ~0);
> - if (HAS_HECI_GSC(gt->i915))
> + if (HAS_HECI_GSC(gt->i915) || HAS_ENGINE(gt, GSC0))
> intel_uncore_write(uncore, GEN11_GUNIT_CSME_INTR_MASK, ~0);
>
> intel_uncore_write(uncore, GEN11_GPM_WGBOXPERF_INTR_ENABLE, 0);
> @@ -249,7 +253,7 @@ void gen11_gt_irq_postinstall(struct intel_gt *gt)
> {
> struct intel_uncore *uncore = gt->uncore;
> u32 irqs = GT_RENDER_USER_INTERRUPT;
> - const u32 gsc_mask = GSC_IRQ_INTF(0) | GSC_IRQ_INTF(1);
> + u32 gsc_mask = 0;
> u32 dmask;
> u32 smask;
>
> @@ -261,6 +265,11 @@ void gen11_gt_irq_postinstall(struct intel_gt *gt)
> dmask = irqs << 16 | irqs;
> smask = irqs << 16;
>
> + if (HAS_ENGINE(gt, GSC0))
> + gsc_mask = irqs;
> + else if (HAS_HECI_GSC(gt->i915))
> + gsc_mask = GSC_IRQ_INTF(0) | GSC_IRQ_INTF(1);
> +
> BUILD_BUG_ON(irqs & 0xffff0000);
>
> /* Enable RCS, BCS, VCS and VECS class interrupts. */
> @@ -268,9 +277,8 @@ void gen11_gt_irq_postinstall(struct intel_gt *gt)
> intel_uncore_write(uncore, GEN11_VCS_VECS_INTR_ENABLE, dmask);
> if (CCS_MASK(gt))
> intel_uncore_write(uncore, GEN12_CCS_RSVD_INTR_ENABLE, smask);
> - if (HAS_HECI_GSC(gt->i915))
> - intel_uncore_write(uncore, GEN11_GUNIT_CSME_INTR_ENABLE,
> - gsc_mask);
> + if (gsc_mask)
> + intel_uncore_write(uncore, GEN11_GUNIT_CSME_INTR_ENABLE,
> gsc_mask);
>
> /* Unmask irqs on RCS, BCS, VCS and VECS engines. */
> intel_uncore_write(uncore, GEN11_RCS0_RSVD_INTR_MASK, ~smask);
> @@ -296,7 +304,7 @@ void gen11_gt_irq_postinstall(struct intel_gt *gt)
> intel_uncore_write(uncore, GEN12_CCS0_CCS1_INTR_MASK, ~dmask);
> if (HAS_ENGINE(gt, CCS2) || HAS_ENGINE(gt, CCS3))
> intel_uncore_write(uncore, GEN12_CCS2_CCS3_INTR_MASK, ~dmask);
> - if (HAS_HECI_GSC(gt->i915))
> + if (gsc_mask)
> intel_uncore_write(uncore, GEN11_GUNIT_CSME_INTR_MASK,
> ~gsc_mask);
>
> /*
> --
> 2.37.3
>
--
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation
