From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: DRI Development <dri-devel@lists.freedesktop.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Subject: [PATCH 07/35] drm/nouveau: try to protect nbo->pin_refcount
Date: Thu, 10 Jan 2013 21:47:48 +0100 [thread overview]
Message-ID: <1357850897-27102-8-git-send-email-daniel.vetter@ffwll.ch> (raw)
In-Reply-To: <1357850897-27102-1-git-send-email-daniel.vetter@ffwll.ch>
... by moving the bo_pin/bo_unpin manipulation of the pin_refcount
under the protection of the ttm reservation lock. pin/unpin seems
to get called from all over the place, so atm this is completely racy.
After this patch there are only a few places in cleanup functions
left which access ->pin_refcount without locking. But I'm hoping that
those are safe and some other code invariant guarantees that this
won't blow up.
In any case, I only need to fix up pin/unpin to make ->pageflip work
safely, so let's keep it at that.
Add a comment to the header to explain the new locking rule.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
drivers/gpu/drm/nouveau/nouveau_bo.c | 22 +++++++++++-----------
drivers/gpu/drm/nouveau/nouveau_bo.h | 2 ++
2 files changed, 13 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 69d7b1d..64d6e304 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -300,17 +300,18 @@ nouveau_bo_pin(struct nouveau_bo *nvbo, uint32_t memtype)
struct ttm_buffer_object *bo = &nvbo->bo;
int ret;
+ ret = ttm_bo_reserve(bo, false, false, false, 0);
+ if (ret)
+ goto out;
+
if (nvbo->pin_refcnt && !(memtype & (1 << bo->mem.mem_type))) {
NV_ERROR(drm, "bo %p pinned elsewhere: 0x%08x vs 0x%08x\n", bo,
1 << bo->mem.mem_type, memtype);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
if (nvbo->pin_refcnt++)
- return 0;
-
- ret = ttm_bo_reserve(bo, false, false, false, 0);
- if (ret)
goto out;
nouveau_bo_placement_set(nvbo, memtype, 0);
@@ -328,10 +329,8 @@ nouveau_bo_pin(struct nouveau_bo *nvbo, uint32_t memtype)
break;
}
}
- ttm_bo_unreserve(bo);
out:
- if (unlikely(ret))
- nvbo->pin_refcnt--;
+ ttm_bo_unreserve(bo);
return ret;
}
@@ -342,13 +341,13 @@ nouveau_bo_unpin(struct nouveau_bo *nvbo)
struct ttm_buffer_object *bo = &nvbo->bo;
int ret;
- if (--nvbo->pin_refcnt)
- return 0;
-
ret = ttm_bo_reserve(bo, false, false, false, 0);
if (ret)
return ret;
+ if (--nvbo->pin_refcnt)
+ goto out;
+
nouveau_bo_placement_set(nvbo, bo->mem.placement, 0);
ret = nouveau_bo_validate(nvbo, false, false);
@@ -365,6 +364,7 @@ nouveau_bo_unpin(struct nouveau_bo *nvbo)
}
}
+out:
ttm_bo_unreserve(bo);
return ret;
}
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.h b/drivers/gpu/drm/nouveau/nouveau_bo.h
index 25ca379..81d00fe 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.h
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.h
@@ -28,6 +28,8 @@ struct nouveau_bo {
struct nouveau_drm_tile *tile;
struct drm_gem_object *gem;
+
+ /* protect by the ttm reservation lock */
int pin_refcnt;
struct ttm_bo_kmap_obj dma_buf_vmap;
--
1.7.10.4
next prev parent reply other threads:[~2013-01-10 20:48 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-10 20:47 [PATCH 00/36] kms locking rework Daniel Vetter
2013-01-10 20:47 ` [PATCH 01/35] drm: review locking rules in drm_crtc.c Daniel Vetter
2013-01-10 20:47 ` [PATCH 02/35] drm/doc: integrate drm_crtc.c kerneldoc Daniel Vetter
2013-01-10 20:47 ` [PATCH 03/35] drm/<drivers>: reorder framebuffer init sequence Daniel Vetter
2013-01-11 21:06 ` Rob Clark
2013-01-10 20:47 ` [PATCH 04/35] drm/vmwgfx: " Daniel Vetter
2013-01-10 20:47 ` [PATCH 05/35] drm/gma500: move fbcon restore to lastclose Daniel Vetter
2013-01-10 20:47 ` [PATCH 06/35] drm/nouveau: protect evo_wait/evo_kick sections with a channel mutex Daniel Vetter
2013-01-10 20:47 ` Daniel Vetter [this message]
2013-01-10 20:47 ` [PATCH 08/35] drm/<drivers>: Unified handling of unimplemented fb->create_handle Daniel Vetter
2013-01-18 15:00 ` Thierry Reding
2013-01-18 18:32 ` Daniel Vetter
2013-01-10 20:47 ` [PATCH 09/35] drm: encapsulate crtc->set_config calls Daniel Vetter
2013-01-10 20:47 ` [PATCH 10/35] drm: add drm_modeset_lock|unlock_all Daniel Vetter
2013-01-10 20:47 ` [PATCH 11/35] drm/i915: use drm_modeset_lock_all Daniel Vetter
2013-01-10 20:47 ` [PATCH 12/35] drm/gma500: " Daniel Vetter
2013-01-10 22:36 ` Alan Cox
2013-01-11 13:25 ` Daniel Vetter
2013-01-10 20:47 ` [PATCH 13/35] drm/ast: " Daniel Vetter
2013-01-10 20:47 ` [PATCH 14/35] drm/shmobile: " Daniel Vetter
2013-01-10 20:47 ` [PATCH 15/35] drm/vmgfx: " Daniel Vetter
2013-01-10 20:47 ` [PATCH 16/35] drm: add per-crtc locks Daniel Vetter
2013-01-10 20:47 ` [PATCH 17/35] drm: only take the crtc lock for ->cursor_set Daniel Vetter
2013-01-10 20:47 ` [PATCH 18/35] drm: only take the crtc lock for ->cursor_move Daniel Vetter
2013-01-10 20:48 ` [PATCH 19/35] drm: revamp locking around fb creation/destruction Daniel Vetter
2013-01-10 20:48 ` [PATCH 20/35] drm: create drm_framebuffer_lookup Daniel Vetter
2013-01-10 20:48 ` [PATCH 21/35] drm: revamp framebuffer cleanup interfaces Daniel Vetter
2013-01-10 20:48 ` [PATCH 22/35] drm: reference framebuffers which are on the idr Daniel Vetter
2013-01-10 20:48 ` [PATCH 23/35] drm: nest modeset locks within fpriv->fbs_lock Daniel Vetter
2013-01-10 20:48 ` [PATCH 24/35] drm: push modeset_lock_all into ->fb_create driver callbacks Daniel Vetter
2013-01-10 20:48 ` [PATCH 25/35] drm: don't take modeset locks in getfb ioctl Daniel Vetter
2013-01-10 20:48 ` [PATCH 26/35] drm: fb refcounting for dirtyfb_ioctl Daniel Vetter
2013-01-10 20:48 ` [PATCH 27/35] drm: refcounting for sprite framebuffers Daniel Vetter
2013-01-10 20:48 ` [PATCH 28/35] drm: refcounting for crtc framebuffers Daniel Vetter
2013-01-10 20:48 ` [PATCH 29/35] drm/i915: dump refcount into framebuffer debugfs file Daniel Vetter
2013-01-11 22:20 ` Rob Clark
2013-01-10 20:48 ` [PATCH 30/35] drm/vmwgfx: add proper framebuffer refcounting Daniel Vetter
2013-01-10 20:48 ` [PATCH 31/35] drm: optimize drm_framebuffer_remove Daniel Vetter
2013-01-10 20:48 ` [PATCH 32/35] drm: only grab the crtc lock for pageflips Daniel Vetter
2013-01-10 20:48 ` [PATCH 33/35] drm: don't hold crtc mutexes for connector ->detect callbacks Daniel Vetter
2013-01-10 20:48 ` [PATCH 34/35] drm/doc: updates for new framebuffer lifetime rules Daniel Vetter
2013-01-10 20:48 ` [PATCH 35/35] drm/fb_helper: check whether fbcon is bound Daniel Vetter
2013-01-10 20:48 ` [PATCH 36/36] drm/i915: wake up all pageflip waiters Daniel Vetter
2013-01-10 20:50 ` Daniel Vetter
2013-01-11 23:17 ` [PATCH 00/36] kms locking rework Rob Clark
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1357850897-27102-8-git-send-email-daniel.vetter@ffwll.ch \
--to=daniel.vetter@ffwll.ch \
--cc=dri-devel@lists.freedesktop.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).