On Fri, Oct 08, 2021 at 02:56:31PM -0700, Matt Roper wrote:
> From: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
>
> The first step of interrupt handling is to read a tile0 register that
> tells us in which tile the interrupt happened; we can then we read the
> usual interrupt registers from the appropriate tile.
>
> Note that this is just the first step of handling interrupts properly on
> multi-tile platforms. Subsequent patches will convert other parts of
> the interrupt handling flow.
>
> Cc: Stuart Summers <stuart.summers@xxxxxxxxx>
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_irq.c | 31 ++++++++++++++++---------------
> 1 file changed, 16 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 038a9ec563c1..9f99ad56cde6 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -2772,37 +2772,38 @@ static irqreturn_t dg1_irq_handler(int irq, void *arg)
> {
> struct drm_i915_private * const i915 = arg;
> struct intel_gt *gt = &i915->gt;
> - void __iomem * const regs = gt->uncore->regs;
> + void __iomem * const t0_regs = gt->uncore->regs;
> u32 master_tile_ctl, master_ctl;
> - u32 gu_misc_iir;
> + u32 gu_misc_iir = 0;
> + unsigned int i;
>
> if (!intel_irqs_enabled(i915))
> return IRQ_NONE;
>
> - master_tile_ctl = dg1_master_intr_disable(regs);
> + master_tile_ctl = dg1_master_intr_disable(t0_regs);
> if (!master_tile_ctl) {
> - dg1_master_intr_enable(regs);
> + dg1_master_intr_enable(t0_regs);
> return IRQ_NONE;
> }
>
> - /* FIXME: we only support tile 0 for now. */
> - if (master_tile_ctl & DG1_MSTR_TILE(0)) {
> + for_each_gt(i915, i, gt) {
> + void __iomem *const regs = gt->uncore->regs;
> +
> + if ((master_tile_ctl & DG1_MSTR_TILE(i)) == 0)
> + continue;
> +
> master_ctl = raw_reg_read(regs, GEN11_GFX_MSTR_IRQ);
> raw_reg_write(regs, GEN11_GFX_MSTR_IRQ, master_ctl);
> - } else {
> - DRM_ERROR("Tile not supported: 0x%08x\n", master_tile_ctl);
> - dg1_master_intr_enable(regs);
> - return IRQ_NONE;
> - }
>
> - gen11_gt_irq_handler(gt, master_ctl);
> + gen11_gt_irq_handler(gt, master_ctl);
> +
> + gu_misc_iir = gen11_gu_misc_irq_ack(gt, master_ctl);
Hmm, I missed it before sending the series, but this doesn't look right.
We ack every tile's gu_misc_irq separately, but...
> + }
>
> if (master_ctl & GEN11_DISPLAY_IRQ)
> gen11_display_irq_handler(i915);
>
> - gu_misc_iir = gen11_gu_misc_irq_ack(gt, master_ctl);
> -
> - dg1_master_intr_enable(regs);
> + dg1_master_intr_enable(t0_regs);
>
> gen11_gu_misc_irq_handler(gt, gu_misc_iir);
...only handle the value from the final tile? Looks like this was
intended to move inside the loop as well.
Matt
>
> --
> 2.33.0
>
--
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation
(916) 356-2795
