On Wed, Aug 14, 2013 at 1:35 PM, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote:
> Chasing wild speculation that we may be writing the wrong addresses
> into the GTT for stolen objects, I would like to inspect those values.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Sedat Dilek <sedat.dilek@xxxxxxxxx>
> ---
>
> Sedak, can you please apply this patch and then attach the contents of
> /sys/kernel/debug/dri/0/i915_gem_gtt with the broken display?
>
Compiling... next-20130814 with drm-intel-nightly (up to commit
d93f59e86ae93066969fa8ae2a6c9ccc7fc4728d) plus this patch.
How do you want your Doner-Kebap? (Going into the city...)
- Sedat -
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 47 ++++++++++++++++++++++++++++++++++++-
> 1 file changed, 46 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 10d864c..4edf65a 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -390,6 +390,51 @@ static int i915_gem_object_info(struct seq_file *m, void* data)
> return 0;
> }
>
> +static int i915_gem_gtt_contents(struct seq_file *m, struct drm_device *dev)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + gen6_gtt_pte_t __iomem *gtt_entries;
> + gen6_gtt_pte_t scratch_pte;
> + gen6_gtt_pte_t zero[8] = {};
> + int i, j, last_zero = 0;
> + int ret;
> +
> + if (INTEL_INFO(dev)->gen < 6)
> + return 0;
> +
> + ret = mutex_lock_interruptible(&dev->struct_mutex);
> + if (ret)
> + return ret;
> +
> + gtt_entries = (gen6_gtt_pte_t __iomem *)dev_priv->gtt.gsm;
> + scratch_pte = dev_priv->gtt.base.pte_encode(dev_priv->gtt.base.scratch.addr, I915_CACHE_LLC);
> + for (i = 0; i < gtt_total_entries(dev_priv->gtt); i += 8) {
> + gen6_gtt_pte_t pte[8];
> + int this_zero;
> +
> + for (j = 0; j < 8; j++) {
> + pte[j] = ioread32(>t_entries[i+j]);
> + if (pte[j] == scratch_pte)
> + pte[j] = 0;
> + }
> +
> + this_zero = memcmp(pte, zero, sizeof(pte)) == 0;
> + if (last_zero && this_zero) {
> + if (last_zero++ == 1)
> + seq_puts(m, "...\n");
> + continue;
> + }
> +
> + seq_printf(m, "[%08x] %08x %08x %08x %08x %08x %08x %08x %08x\n",
> + i, pte[0], pte[1], pte[2], pte[3], pte[4], pte[5], pte[6], pte[7]);
> + last_zero = this_zero;
> + }
> +
> + mutex_unlock(&dev->struct_mutex);
> +
> + return 0;
> +}
> +
> static int i915_gem_gtt_info(struct seq_file *m, void *data)
> {
> struct drm_info_node *node = (struct drm_info_node *) m->private;
> @@ -422,7 +467,7 @@ static int i915_gem_gtt_info(struct seq_file *m, void *data)
> seq_printf(m, "Total %d objects, %zu bytes, %zu GTT size\n",
> count, total_obj_size, total_gtt_size);
>
> - return 0;
> + return i915_gem_gtt_contents(m, dev);
> }
>
> static int i915_gem_pageflip_info(struct seq_file *m, void *data)
> --
> 1.8.4.rc2
>
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