Quoting Mika Kuoppala (2018-09-20 15:33:46)
> The returning of iir through function parameter is eyesore.
> Make guc irq acking inline and return the iir directly, handling
> the empty iir exception early. We can then omit passing the
> master control to guc handler as the iir now contains everything
> we need.
>
> Cc: Chris Wilson <ch...@chris-wilson.co.uk>
> Cc: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>
> Signed-off-by: Mika Kuoppala <mika.kuopp...@linux.intel.com>
> ---
> drivers/gpu/drm/i915/i915_irq.c | 38 ++++++++++++++++-----------------
> 1 file changed, 18 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index c35576f9c3f5..e9034d6d87b0 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -3088,36 +3088,34 @@ gen11_gt_irq_handler(struct drm_i915_private * const
> i915,
> spin_unlock(&i915->irq_lock);
> }
>
> -static void
> -gen11_gu_misc_irq_ack(struct drm_i915_private *dev_priv, const u32
> master_ctl,
> - u32 *iir)
> +static inline u32
> +gen11_gu_misc_irq_ack(void __iomem * const regs, const u32 master_ctl)
> {
> - void __iomem * const regs = dev_priv->regs;
> + u32 iir;
>
> if (!(master_ctl & GEN11_GU_MISC_IRQ))
> - return;
> + return 0;
> +
> + iir = raw_reg_read(regs, GEN11_GU_MISC_IIR);
> + if (likely(iir))
> + raw_reg_write(regs, GEN11_GU_MISC_IIR, iir);
> + else
> + DRM_ERROR("GU_MISC iir blank!\n");
>
> - *iir = raw_reg_read(regs, GEN11_GU_MISC_IIR);
> - if (likely(*iir))
> - raw_reg_write(regs, GEN11_GU_MISC_IIR, *iir);
> + return iir;
> }
>
> static void
> gen11_gu_misc_irq_handler(struct drm_i915_private *dev_priv,
> - const u32 master_ctl, const u32 iir)
> + const u32 iir)
> {
> - if (!(master_ctl & GEN11_GU_MISC_IRQ))
> - return;
However, the argument is that by using master_ctl as our guard for all
functions, should encourage the compiler to keep it around in a
register. That's the thinking at least.
Care to test that theory if it makes any significant difference to code
layout and register usage?
-Chris
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