On Fri, 25 Jan 2013 18:57:36 -0200
Paulo Zanoni <przanoni at gmail.com> wrote:
> From: Paulo Zanoni <paulo.r.zanoni at intel.com>
>
> This avoids polluting i915_write##x and also allows us to reuse code
> on i915_read##x.
>
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
> ---
> drivers/gpu/drm/i915/i915_drv.c | 24 ++++++++++++++++--------
> 1 file changed, 16 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 9cc8f87..ae0a55a 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -1224,6 +1224,20 @@ ilk_dummy_write(struct drm_i915_private *dev_priv)
> I915_WRITE_NOTRACE(MI_MODE, 0);
> }
>
> +#define UNCLAIMED_REG_CLEAR(dev_priv, reg) \
> + if (IS_HASWELL(dev_priv->dev) && \
> + (I915_READ_NOTRACE(GEN7_ERR_INT) & ERR_INT_MMIO_UNCLAIMED)) { \
> + DRM_ERROR("Unknown unclaimed register before writing to %x\n", reg); \
> + I915_WRITE_NOTRACE(GEN7_ERR_INT, ERR_INT_MMIO_UNCLAIMED); \
> + }
> +
You don't really need the if here, do you? I think the way it worked
originally was fine.
> +#define UNCLAIMED_REG_CHECK(dev_priv, reg) \
> + if (IS_HASWELL(dev_priv->dev) && \
> + (I915_READ_NOTRACE(GEN7_ERR_INT) & ERR_INT_MMIO_UNCLAIMED)) { \
> + DRM_ERROR("Unclaimed write to %x\n", reg); \
> + writel(ERR_INT_MMIO_UNCLAIMED, dev_priv->regs + GEN7_ERR_INT); \
> + }
> +
> #define __i915_read(x, y) \
> u##x i915_read##x(struct drm_i915_private *dev_priv, u32 reg) { \
> u##x val = 0; \
I suppose you could add some 'unlikely' predictions in another patch if
you wanted. I really don't know what the consensus is on using those
these day.
> @@ -1262,10 +1276,7 @@ void i915_write##x(struct drm_i915_private *dev_priv, u32 reg, u##x val) { \
> } \
> if (IS_GEN5(dev_priv->dev)) \
> ilk_dummy_write(dev_priv); \
> - if (IS_HASWELL(dev_priv->dev) && (I915_READ_NOTRACE(GEN7_ERR_INT) & ERR_INT_MMIO_UNCLAIMED)) { \
> - DRM_ERROR("Unknown unclaimed register before writing to %x\n", reg); \
> - I915_WRITE_NOTRACE(GEN7_ERR_INT, ERR_INT_MMIO_UNCLAIMED); \
> - } \
> + UNCLAIMED_REG_CLEAR(dev_priv, reg); \
> if (IS_VALLEYVIEW(dev_priv->dev) && IS_DISPLAYREG(reg)) { \
> write##y(val, dev_priv->regs + reg + 0x180000); \
> } else { \
Here's what I meant above, you replace 2 lines of code with 4 from the
macro. (Including an extra MMIO read).
> @@ -1274,10 +1285,7 @@ void i915_write##x(struct drm_i915_private *dev_priv, u32 reg, u##x val) { \
> if (unlikely(__fifo_ret)) { \
> gen6_gt_check_fifodbg(dev_priv); \
> } \
> - if (IS_HASWELL(dev_priv->dev) && (I915_READ_NOTRACE(GEN7_ERR_INT) & ERR_INT_MMIO_UNCLAIMED)) { \
> - DRM_ERROR("Unclaimed write to %x\n", reg); \
> - writel(ERR_INT_MMIO_UNCLAIMED, dev_priv->regs + GEN7_ERR_INT); \
> - } \
> + UNCLAIMED_REG_CHECK(dev_priv, reg); \
> }
> __i915_write(8, b)
> __i915_write(16, w)
--
Ben Widawsky, Intel Open Source Technology Center
