Re: [PATCH 06/10] drm/i915/chv: Streamline CHV forcewake stuff

Ben Widawsky
2014-04-25T22:24:50Z

On Mon, Apr 21, 2014 at 01:34:10PM +0530, deepak.s@linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> Streamline the CHV forcewake functions just like was done for VLV.
>
> This will also fix a bug in accessing the common well registers,
> where we'd end up trying to wake up the wells too many times
> since we'd call force_wake_get/put twice per register access, with
> FORCEFAKE_ALL both times.
>
> Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

Already reviewed. I guess this patch makes what I was requesting earlier
a bit harder to implement. :-(

> ---
> drivers/gpu/drm/i915/intel_uncore.c | 88 ++++++++++++++-----------------------
> 1 file changed, 32 insertions(+), 56 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
> index 11741e4..f1264e2 100644
> --- a/drivers/gpu/drm/i915/intel_uncore.c
> +++ b/drivers/gpu/drm/i915/intel_uncore.c
> @@ -619,35 +619,22 @@ chv_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
> unsigned fwengine = 0; \
> REG_READ_HEADER(x); \
> if (FORCEWAKE_CHV_RENDER_RANGE_OFFSET(reg)) { \
> - fwengine = FORCEWAKE_RENDER; \
> - } \
> - else if (FORCEWAKE_CHV_MEDIA_RANGE_OFFSET(reg)) { \
> - fwengine = FORCEWAKE_MEDIA; \
> - } \
> - else if (FORCEWAKE_CHV_COMMON_RANGE_OFFSET(reg)) { \
> - fwengine = FORCEWAKE_ALL; \
> - } \
> - if (FORCEWAKE_RENDER & fwengine) { \
> - if (dev_priv->uncore.fw_rendercount++ == 0) \
> - (dev_priv)->uncore.funcs.force_wake_get(dev_priv, \
> - fwengine); \
> - } \
> - if (FORCEWAKE_MEDIA & fwengine) { \
> - if (dev_priv->uncore.fw_mediacount++ == 0) \
> - (dev_priv)->uncore.funcs.force_wake_get(dev_priv, \
> - fwengine); \
> + if (dev_priv->uncore.fw_rendercount == 0) \
> + fwengine = FORCEWAKE_RENDER; \
> + } else if (FORCEWAKE_CHV_MEDIA_RANGE_OFFSET(reg)) { \
> + if (dev_priv->uncore.fw_mediacount == 0) \
> + fwengine = FORCEWAKE_MEDIA; \
> + } else if (FORCEWAKE_CHV_COMMON_RANGE_OFFSET(reg)) { \
> + if (dev_priv->uncore.fw_rendercount == 0) \
> + fwengine |= FORCEWAKE_RENDER; \
> + if (dev_priv->uncore.fw_mediacount == 0) \
> + fwengine |= FORCEWAKE_MEDIA; \
> } \
> + if (fwengine) \
> + dev_priv->uncore.funcs.force_wake_get(dev_priv, fwengine); \
> val = __raw_i915_read##x(dev_priv, reg); \
> - if (FORCEWAKE_RENDER & fwengine) { \
> - if (--dev_priv->uncore.fw_rendercount == 0) \
> - (dev_priv)->uncore.funcs.force_wake_put(dev_priv, \
> - fwengine); \
> - } \
> - if (FORCEWAKE_MEDIA & fwengine) { \
> - if (--dev_priv->uncore.fw_mediacount == 0) \
> - (dev_priv)->uncore.funcs.force_wake_put(dev_priv, \
> - fwengine); \
> - } \
> + if (fwengine) \
> + dev_priv->uncore.funcs.force_wake_put(dev_priv, fwengine); \
> REG_READ_FOOTER; \
> }
>
> @@ -781,38 +768,27 @@ gen8_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace
> static void \
> chv_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
> unsigned fwengine = 0; \
> - bool __needs_put = !is_gen8_shadowed(dev_priv, reg); \
> + bool shadowed = is_gen8_shadowed(dev_priv, reg); \
> REG_WRITE_HEADER; \
> - if (FORCEWAKE_CHV_RENDER_RANGE_OFFSET(reg)) { \
> - fwengine = FORCEWAKE_RENDER; \
> - } \
> - else if (FORCEWAKE_CHV_MEDIA_RANGE_OFFSET(reg)) { \
> - fwengine = FORCEWAKE_MEDIA; \
> - } \
> - else if (FORCEWAKE_CHV_COMMON_RANGE_OFFSET(reg)) { \
> - fwengine = FORCEWAKE_ALL; \
> - } \
> - if (__needs_put && (FORCEWAKE_RENDER & fwengine)) { \
> - if (dev_priv->uncore.fw_rendercount++ == 0) \
> - (dev_priv)->uncore.funcs.force_wake_get(dev_priv, \
> - fwengine); \
> - } \
> - if (__needs_put && (FORCEWAKE_MEDIA & fwengine)) { \
> - if (dev_priv->uncore.fw_mediacount++ == 0) \
> - (dev_priv)->uncore.funcs.force_wake_get(dev_priv, \
> - fwengine); \
> + if (!shadowed) { \
> + if (FORCEWAKE_CHV_RENDER_RANGE_OFFSET(reg)) { \
> + if (dev_priv->uncore.fw_rendercount == 0) \
> + fwengine = FORCEWAKE_RENDER; \
> + } else if (FORCEWAKE_CHV_MEDIA_RANGE_OFFSET(reg)) { \
> + if (dev_priv->uncore.fw_mediacount == 0) \
> + fwengine = FORCEWAKE_MEDIA; \
> + } else if (FORCEWAKE_CHV_COMMON_RANGE_OFFSET(reg)) { \
> + if (dev_priv->uncore.fw_rendercount == 0) \
> + fwengine |= FORCEWAKE_RENDER; \
> + if (dev_priv->uncore.fw_mediacount == 0) \
> + fwengine |= FORCEWAKE_MEDIA; \
> + } \

Nice target here we could extract out as common between read/write.

> } \
> + if (fwengine) \
> + dev_priv->uncore.funcs.force_wake_get(dev_priv, fwengine); \
> __raw_i915_write##x(dev_priv, reg, val); \
> - if (__needs_put && (FORCEWAKE_RENDER & fwengine)) { \
> - if (--dev_priv->uncore.fw_rendercount == 0) \
> - (dev_priv)->uncore.funcs.force_wake_put(dev_priv, \
> - fwengine); \
> - } \
> - if (__needs_put && (FORCEWAKE_MEDIA & fwengine)) { \
> - if (--dev_priv->uncore.fw_mediacount == 0) \
> - (dev_priv)->uncore.funcs.force_wake_put(dev_priv, \
> - fwengine); \
> - } \
> + if (fwengine) \
> + dev_priv->uncore.funcs.force_wake_put(dev_priv, fwengine); \
> REG_WRITE_FOOTER; \
> }
>

Reviewed-by: Ben Widawsky <ben@bwidawsk.net>

--
Ben Widawsky, Intel Open Source Technology Center
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org