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Message-ID: <AANLkTimglAyS94q0Y3DEx9RROPxus-7l3OfF2_b-zAR3@mail.gmail.com>
Date: Wed, 12 May 2010 00:52:56 +0530
From: Jaswinder Singh Rajput <jaswinderlinux@...il.com>
To: Chris Wilson <chris@...is-wilson.co.uk>
Cc: intel-gfx@...ts.freedesktop.org,
Andrew Morton <akpm@...ux-foundation.org>,
dri-devel@...ts.freedesktop.org, Dave Airlie <airlied@...ux.ie>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915: Record error batch buffers using iomem
Hello Chris and Andrew,
On Tue, May 11, 2010 at 11:52 PM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
> Directly read the GTT mapping for the contents of the batch buffers
> rather than relying on possibly stale CPU caches. Also for completeness
> scan the flushing/inactive lists for the current buffers - we are
> collecting error state after all.
>
> Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Yes, I have tested this patch.
I booted 3 times, and this patch fixes the DRM as well as softirq
warnings and I am getting Xwindows with this patch.
I am still doing more testing.
Thanks,
--
Jaswinder Singh.
> ---
> drivers/gpu/drm/i915/i915_irq.c | 64 ++++++++++++++++++++++++++++++++++----
> 1 files changed, 57 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 87113da..14301a4 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -441,9 +441,11 @@ static struct drm_i915_error_object *
> i915_error_object_create(struct drm_device *dev,
> struct drm_gem_object *src)
> {
> + drm_i915_private_t *dev_priv = dev->dev_private;
> struct drm_i915_error_object *dst;
> struct drm_i915_gem_object *src_priv;
> int page, page_count;
> + u32 reloc_offset;
>
> if (src == NULL)
> return NULL;
> @@ -458,14 +460,23 @@ i915_error_object_create(struct drm_device *dev,
> if (dst == NULL)
> return NULL;
>
> + reloc_offset = src_priv->gtt_offset;
> for (page = 0; page < page_count; page++) {
> - void *s, *d = kmalloc(PAGE_SIZE, GFP_ATOMIC);
> + void __iomem *s;
> + void *d;
> +
> + d = kmalloc(PAGE_SIZE, GFP_ATOMIC);
> if (d == NULL)
> goto unwind;
> - s = kmap_atomic(src_priv->pages[page], KM_USER0);
> - memcpy(d, s, PAGE_SIZE);
> - kunmap_atomic(s, KM_USER0);
> +
> + s = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping,
> + reloc_offset);
> + memcpy_fromio(d, s, PAGE_SIZE);
> + io_mapping_unmap_atomic(s);
> +
> dst->pages[page] = d;
> +
> + reloc_offset += PAGE_SIZE;
> }
> dst->page_count = page_count;
> dst->gtt_offset = src_priv->gtt_offset;
> @@ -621,18 +632,57 @@ static void i915_capture_error_state(struct drm_device *dev)
>
> if (batchbuffer[1] == NULL &&
> error->acthd >= obj_priv->gtt_offset &&
> - error->acthd < obj_priv->gtt_offset + obj->size &&
> - batchbuffer[0] != obj)
> + error->acthd < obj_priv->gtt_offset + obj->size)
> batchbuffer[1] = obj;
>
> count++;
> }
> + /* Scan the other lists for completeness for those bizarre errors. */
> + if (batchbuffer[0] == NULL || batchbuffer[1] == NULL) {
> + list_for_each_entry(obj_priv, &dev_priv->mm.flushing_list, list) {
> + struct drm_gem_object *obj = obj_priv->obj;
> +
> + if (batchbuffer[0] == NULL &&
> + bbaddr >= obj_priv->gtt_offset &&
> + bbaddr < obj_priv->gtt_offset + obj->size)
> + batchbuffer[0] = obj;
> +
> + if (batchbuffer[1] == NULL &&
> + error->acthd >= obj_priv->gtt_offset &&
> + error->acthd < obj_priv->gtt_offset + obj->size)
> + batchbuffer[1] = obj;
> +
> + if (batchbuffer[0] && batchbuffer[1])
> + break;
> + }
> + }
> + if (batchbuffer[0] == NULL || batchbuffer[1] == NULL) {
> + list_for_each_entry(obj_priv, &dev_priv->mm.inactive_list, list) {
> + struct drm_gem_object *obj = obj_priv->obj;
> +
> + if (batchbuffer[0] == NULL &&
> + bbaddr >= obj_priv->gtt_offset &&
> + bbaddr < obj_priv->gtt_offset + obj->size)
> + batchbuffer[0] = obj;
> +
> + if (batchbuffer[1] == NULL &&
> + error->acthd >= obj_priv->gtt_offset &&
> + error->acthd < obj_priv->gtt_offset + obj->size)
> + batchbuffer[1] = obj;
> +
> + if (batchbuffer[0] && batchbuffer[1])
> + break;
> + }
> + }
>
> /* We need to copy these to an anonymous buffer as the simplest
> * method to avoid being overwritten by userpace.
> */
> error->batchbuffer[0] = i915_error_object_create(dev, batchbuffer[0]);
> - error->batchbuffer[1] = i915_error_object_create(dev, batchbuffer[1]);
> + if (batchbuffer[1] != batchbuffer[0])
> + error->batchbuffer[1] = i915_error_object_create(dev, batchbuffer[1]);
> + else
> + error->batchbuffer[1] = NULL;
>
> /* Record the ringbuffer */
> error->ringbuffer = i915_error_object_create(dev, dev_priv->ring.ring_obj);
> --
> 1.7.1
>
>
--
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