linux-kernel - Re: [PATCH] drm/i915,agp/intel: Do not clear stolen entries

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Date:	Fri, 21 Jan 2011 17:26:50 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [PATCH] drm/i915,agp/intel: Do not clear stolen entries

this patch fixed the issue for me

Tested-by: Jiri Olsa <jolsa@...hat.com>
if needed :)

thanks,
jirka


On Fri, Jan 21, 2011 at 10:58:57AM +0000, Chris Wilson wrote:
> We can only utilize the stolen portion of the GTT if we are in sole
> charge of the hardware. This is only true if using GEM and KMS,
> otherwise VESA continues to access stolen memory.
> 
> Reported-by: Arnd Bergmann <arnd@...db.de>
> Reported-by: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
> ---
>  drivers/char/agp/intel-gtt.c    |   18 ++++++++----------
>  drivers/gpu/drm/i915/i915_gem.c |    6 ++++--
>  2 files changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
> index 826ab09..cbbcaba 100644
> --- a/drivers/char/agp/intel-gtt.c
> +++ b/drivers/char/agp/intel-gtt.c
> @@ -68,6 +68,7 @@ static struct _intel_private {
>  	phys_addr_t gma_bus_addr;
>  	u32 PGETBL_save;
>  	u32 __iomem *gtt;		/* I915G */
> +	bool clear_fake_agp; /* on first access via agp, fill with scratch */
>  	int num_dcache_entries;
>  	union {
>  		void __iomem *i9xx_flush_page;
> @@ -869,21 +870,12 @@ static int intel_fake_agp_free_gatt_table(struct agp_bridge_data *bridge)
>  
>  static int intel_fake_agp_configure(void)
>  {
> -	int i;
> -
>  	if (!intel_enable_gtt())
>  	    return -EIO;
>  
> +	intel_private.clear_fake_agp = true;
>  	agp_bridge->gart_bus_addr = intel_private.gma_bus_addr;
>  
> -	for (i = 0; i < intel_private.base.gtt_total_entries; i++) {
> -		intel_private.driver->write_entry(intel_private.scratch_page_dma,
> -						  i, 0);
> -	}
> -	readl(intel_private.gtt+i-1);	/* PCI Posting. */
> -
> -	global_cache_flush();
> -
>  	return 0;
>  }
>  
> @@ -945,6 +937,12 @@ static int intel_fake_agp_insert_entries(struct agp_memory *mem,
>  {
>  	int ret = -EINVAL;
>  
> +	if (intel_private.clear_fake_agp) {
> +		intel_gtt_clear_range(intel_private.base.stolen_size / PAGE_SIZE,
> +				      intel_private.base.gtt_total_entries);
> +		intel_private.clear_fake_agp = false;
> +	}
> +
>  	if (INTEL_GTT_GEN == 1 && type == AGP_DCACHE_MEMORY)
>  		return i810_insert_dcache_entries(mem, pg_start, type);
>  
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 812b97b..6542e7d 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -140,12 +140,14 @@ void i915_gem_do_init(struct drm_device *dev,
>  {
>  	drm_i915_private_t *dev_priv = dev->dev_private;
>  
> -	drm_mm_init(&dev_priv->mm.gtt_space, start,
> -		    end - start);
> +	drm_mm_init(&dev_priv->mm.gtt_space, start, end - start);
>  
>  	dev_priv->mm.gtt_total = end - start;
>  	dev_priv->mm.mappable_gtt_total = min(end, mappable_end) - start;
>  	dev_priv->mm.gtt_mappable_end = mappable_end;
> +
> +	/* Take over this portion of the GTT */
> +	intel_gtt_clear_range(start / PAGE_SIZE, end / PAGE_SIZE);
>  }
>  
>  int
> -- 
> 1.7.2.3
> 
> --
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