[Intel-gfx] [PATCH] drm/i915: Reserve powerctx for chv from the stolen allocator
Ville Syrjälä
ville.syrjala at linux.intel.com
Mon Nov 6 14:23:24 UTC 2017
On Sat, Nov 04, 2017 at 09:43:38PM +0000, Chris Wilson wrote:
> Ensure that we do not overwrite the cherryview power context by
> reserving its range in the stolen allocator; exactly like how we handle
> the same reservation for valleyview.
IIRC CHV pctx must live inside the "reserved" region. So this
should never happen.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 3 +-
> drivers/gpu/drm/i915/intel_pm.c | 97 +++++++++++++++--------------------------
> 2 files changed, 37 insertions(+), 63 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 72bb5b51035a..d6462388c3a6 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1377,6 +1377,7 @@ struct intel_rps {
> };
>
> struct intel_rc6 {
> + struct drm_i915_gem_object *pctx;
> bool enabled;
> };
>
> @@ -2464,8 +2465,6 @@ struct drm_i915_private {
>
> struct i915_gpu_error gpu_error;
>
> - struct drm_i915_gem_object *vlv_pctx;
> -
> /* list of fbdev register on this device */
> struct intel_fbdev *fbdev;
> struct work_struct fbdev_suspend_work;
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 07118c0b69d3..1a0cf53e0638 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -7034,7 +7034,7 @@ static void valleyview_check_pctx(struct drm_i915_private *dev_priv)
> unsigned long pctx_addr = I915_READ(VLV_PCBR) & ~4095;
>
> WARN_ON(pctx_addr != dev_priv->mm.stolen_base +
> - dev_priv->vlv_pctx->stolen->start);
> + dev_priv->gt_pm.rc6.pctx->stolen->start);
> }
>
>
> @@ -7046,77 +7046,54 @@ static void cherryview_check_pctx(struct drm_i915_private *dev_priv)
> WARN_ON((pctx_addr >> VLV_PCBR_ADDR_SHIFT) == 0);
> }
>
> -static void cherryview_setup_pctx(struct drm_i915_private *dev_priv)
> -{
> - struct i915_ggtt *ggtt = &dev_priv->ggtt;
> - unsigned long pctx_paddr, paddr;
> - u32 pcbr;
> - int pctx_size = 32*1024;
> -
> - pcbr = I915_READ(VLV_PCBR);
> - if ((pcbr >> VLV_PCBR_ADDR_SHIFT) == 0) {
> - DRM_DEBUG_DRIVER("BIOS didn't set up PCBR, fixing up\n");
> - paddr = (dev_priv->mm.stolen_base +
> - (ggtt->stolen_size - pctx_size));
> -
> - pctx_paddr = (paddr & (~4095));
> - I915_WRITE(VLV_PCBR, pctx_paddr);
> - }
> -
> - DRM_DEBUG_DRIVER("PCBR: 0x%08x\n", I915_READ(VLV_PCBR));
> -}
> -
> -static void valleyview_setup_pctx(struct drm_i915_private *dev_priv)
> +static void setup_pctx(struct drm_i915_private *dev_priv, int pctx_size)
> {
> struct drm_i915_gem_object *pctx;
> - unsigned long pctx_paddr;
> u32 pcbr;
> - int pctx_size = 24*1024;
>
> pcbr = I915_READ(VLV_PCBR);
> if (pcbr) {
> /* BIOS set it up already, grab the pre-alloc'd space */
> - int pcbr_offset;
> + u32 start = round_down(pcbr, 4096);
> + u32 end = round_up(pcbr + pctx_size, 4096);
>
> - pcbr_offset = (pcbr & (~4095)) - dev_priv->mm.stolen_base;
> pctx = i915_gem_object_create_stolen_for_preallocated(dev_priv,
> - pcbr_offset,
> + start - dev_priv->mm.stolen_base,
> I915_GTT_OFFSET_NONE,
> - pctx_size);
> - goto out;
> - }
> + end - start);
> + } else {
> + DRM_DEBUG_DRIVER("BIOS didn't set up PCBR, fixing up\n");
>
> - DRM_DEBUG_DRIVER("BIOS didn't set up PCBR, fixing up\n");
> + /*
> + * From the Gunit register HAS:
> + * The Gfx driver is expected to program this register and
> + * ensure proper allocation within Gfx stolen memory. For
> + * example, this register should be programmed such than the
> + * PCBR range does not overlap with other ranges, such as the
> + * frame buffer, protected memory, or any other relevant ranges.
> + */
> + pctx = i915_gem_object_create_stolen(dev_priv, pctx_size);
> + if (!pctx) {
> + DRM_DEBUG("not enough stolen space for PCTX, disabling\n");
> + return;
> + }
>
> - /*
> - * From the Gunit register HAS:
> - * The Gfx driver is expected to program this register and ensure
> - * proper allocation within Gfx stolen memory. For example, this
> - * register should be programmed such than the PCBR range does not
> - * overlap with other ranges, such as the frame buffer, protected
> - * memory, or any other relevant ranges.
> - */
> - pctx = i915_gem_object_create_stolen(dev_priv, pctx_size);
> - if (!pctx) {
> - DRM_DEBUG("not enough stolen space for PCTX, disabling\n");
> - goto out;
> + I915_WRITE(VLV_PCBR,
> + dev_priv->mm.stolen_base + pctx->stolen->start);
> }
> + DRM_DEBUG_DRIVER("PCBR: 0x%08x [0x%08x]\n", I915_READ(VLV_PCBR), pcbr);
>
> - pctx_paddr = dev_priv->mm.stolen_base + pctx->stolen->start;
> - I915_WRITE(VLV_PCBR, pctx_paddr);
> -
> -out:
> - DRM_DEBUG_DRIVER("PCBR: 0x%08x\n", I915_READ(VLV_PCBR));
> - dev_priv->vlv_pctx = pctx;
> + dev_priv->gt_pm.rc6.pctx = pctx;
> }
>
> -static void valleyview_cleanup_pctx(struct drm_i915_private *dev_priv)
> +static void cherryview_setup_pctx(struct drm_i915_private *dev_priv)
> {
> - if (WARN_ON(!dev_priv->vlv_pctx))
> - return;
> + setup_pctx(dev_priv, 32 << 10);
> +}
>
> - i915_gem_object_put(dev_priv->vlv_pctx);
> - dev_priv->vlv_pctx = NULL;
> +static void valleyview_setup_pctx(struct drm_i915_private *dev_priv)
> +{
> + setup_pctx(dev_priv, 24 << 10);
> }
>
> static void vlv_init_gpll_ref_freq(struct drm_i915_private *dev_priv)
> @@ -7225,11 +7202,6 @@ static void cherryview_init_gt_powersave(struct drm_i915_private *dev_priv)
> "Odd GPU freq values\n");
> }
>
> -static void valleyview_cleanup_gt_powersave(struct drm_i915_private *dev_priv)
> -{
> - valleyview_cleanup_pctx(dev_priv);
> -}
> -
> static void cherryview_enable_rc6(struct drm_i915_private *dev_priv)
> {
> struct intel_engine_cs *engine;
> @@ -7949,8 +7921,11 @@ void intel_init_gt_powersave(struct drm_i915_private *dev_priv)
>
> void intel_cleanup_gt_powersave(struct drm_i915_private *dev_priv)
> {
> - if (IS_VALLEYVIEW(dev_priv))
> - valleyview_cleanup_gt_powersave(dev_priv);
> + struct drm_i915_gem_object *pctx;
> +
> + pctx = fetch_and_zero(&dev_priv->gt_pm.rc6.pctx);
> + if (pctx)
> + i915_gem_object_put(pctx);
>
> if (!i915_modparams.enable_rc6)
> intel_runtime_pm_put(dev_priv);
> --
> 2.15.0
>
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--
Ville Syrjälä
Intel OTC
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