From: Daniel Vetter <daniel@ffwll.ch>
To: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>,
Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
Radeon Dev <xorg-driver-ati@lists.x.org>,
DRI Development <dri-devel@lists.freedesktop.org>,
Nouveau Dev <nouveau@lists.freedesktop.org>
Subject: Re: [PATCH 04/37] drm/i915: rework locking for intel_dpio|sbi_read|write
Date: Wed, 12 Dec 2012 23:00:34 +0100 [thread overview]
Message-ID: <20121212220032.GA5690@phenom.ffwll.local> (raw)
In-Reply-To: <20121212125447.728e791a@jbarnes-desktop>
On Wed, Dec 12, 2012 at 12:54:47PM -0800, Jesse Barnes wrote:
> On Wed, 12 Dec 2012 14:06:44 +0100
> Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
>
> > Spinning for up to 200 us with interrupts locked out is not good. So
> > let's just spin (and even that seems to be excessive).
> >
> > And we don't call these functions from interrupt context, so this is
> > not required. Besides that doing anything in interrupt contexts which
> > might take a few hundred us is a no-go. So just convert the entire
> > thing to a mutex. Also move the mutex-grabbing out of the read/write
> > functions (add a WARN_ON(!is_locked)) instead) since all callers are
> > nicely grouped together.
> >
> > Finally the real motivation for this change: Dont grab the modeset
> > mutex in the dpio debugfs file, we don't need that consistency. And
> > correctness of the dpio interface is ensured with the dpio_lock.
> >
> > Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>
> Looks fine, I guess you could convert the wait_for_atomic_us to the
> non-atomic variant now that you have a mutex. Either way:
I like that _us purely to document the correct timeout ...
> Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Queued for -next, thanks for the review.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
next prev parent reply other threads:[~2012-12-12 22:00 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-12 13:06 [PATCH 00/37] [RFC] revamped modeset locking Daniel Vetter
2012-12-12 13:06 ` [PATCH 01/37] drm: review locking rules in drm_crtc.c Daniel Vetter
2012-12-12 13:06 ` [PATCH 05/37] drm/i915: use drm_modeset_lock_all Daniel Vetter
2012-12-12 13:06 ` [PATCH 08/37] drm/shmobile: " Daniel Vetter
2012-12-12 13:06 ` [PATCH 10/37] drm: add per-crtc locks Daniel Vetter
2012-12-13 11:38 ` [Intel-gfx] " Ville Syrjälä
2012-12-13 11:54 ` Daniel Vetter
2012-12-13 14:25 ` Ville Syrjälä
2012-12-12 13:06 ` [PATCH 11/37] drm/radeon: add W|RREG32_IDX for MM_INDEX|DATA based mmio accesss Daniel Vetter
2012-12-12 13:07 ` [PATCH 25/37] drm: don't take modeset locks in getfb ioctl Daniel Vetter
2012-12-12 13:07 ` [PATCH 26/37] drm: fb refcounting for dirtyfb_ioctl Daniel Vetter
2012-12-12 13:07 ` [PATCH 31/37] drm/vmwgfx: add proper framebuffer refcounting Daniel Vetter
2012-12-12 13:07 ` [PATCH 33/37] drm/nouveau: try to protect nbo->pin_refcount Daniel Vetter
[not found] ` <1355317637-16742-1-git-send-email-daniel.vetter-/w4YWyX8dFk@public.gmane.org>
2012-12-12 13:06 ` [PATCH 02/37] drm/doc: integrate drm_crtc.c kerneldoc Daniel Vetter
2012-12-12 13:06 ` [PATCH 03/37] drm: add drm_modeset_lock|unlock_all Daniel Vetter
2012-12-12 13:06 ` [PATCH 04/37] drm/i915: rework locking for intel_dpio|sbi_read|write Daniel Vetter
2012-12-12 20:54 ` [Intel-gfx] " Jesse Barnes
2012-12-12 22:00 ` Daniel Vetter [this message]
2012-12-12 22:05 ` Jesse Barnes
2012-12-12 13:06 ` [PATCH 06/37] drm/gma500: use drm_modeset_lock_all Daniel Vetter
2012-12-12 13:06 ` [PATCH 07/37] drm/ast: " Daniel Vetter
2012-12-12 13:06 ` [PATCH 09/37] drm/vmgfx: " Daniel Vetter
2012-12-12 13:06 ` [PATCH 12/37] drm/radeon: make indirect register access concurrency-safe Daniel Vetter
2012-12-12 13:06 ` [PATCH 13/37] drm/nouveau: protect evo_wait/evo_kick sections with a channel mutex Daniel Vetter
2012-12-12 13:06 ` [PATCH 14/37] drm: only take the crtc lock for ->cursor_set Daniel Vetter
2012-12-12 13:06 ` [PATCH 15/37] drm: only take the crtc lock for ->cursor_move Daniel Vetter
2012-12-13 11:03 ` [PATCH] " Daniel Vetter
2012-12-12 13:06 ` [PATCH 16/37] drm/<drivers>: reorder framebuffer init sequence Daniel Vetter
2012-12-13 11:05 ` [PATCH 1/2] " Daniel Vetter
[not found] ` <1355396719-25286-1-git-send-email-daniel.vetter-/w4YWyX8dFk@public.gmane.org>
2012-12-13 11:05 ` [PATCH 2/2] drm/exynos: " Daniel Vetter
2012-12-13 12:26 ` Inki Dae
2012-12-13 12:43 ` Daniel Vetter
2012-12-13 15:16 ` Inki Dae
2012-12-13 16:38 ` Daniel Vetter
2012-12-14 4:57 ` Inki Dae
2012-12-14 8:40 ` Daniel Vetter
2012-12-12 13:06 ` [PATCH 17/37] drm: revamp locking around fb creation/destruction Daniel Vetter
2012-12-12 13:06 ` [PATCH 18/37] drm: create drm_framebuffer_lookup Daniel Vetter
2012-12-12 13:06 ` [PATCH 19/37] drm/gma500: move fbcon restore to lastclose Daniel Vetter
2012-12-12 13:07 ` [PATCH 20/37] drm: revamp framebuffer cleanup interfaces Daniel Vetter
2012-12-12 13:07 ` [PATCH 21/37] drm: reference framebuffers which are on the idr Daniel Vetter
2012-12-12 13:07 ` [PATCH 22/37] drm: nest modeset locks within fpriv->fbs_lock Daniel Vetter
2012-12-12 13:07 ` [PATCH 23/37] drm/i915: fixup overlay stolen memory leak Daniel Vetter
2012-12-12 13:07 ` [PATCH 24/37] drm: push modeset_lock_all into ->fb_create driver callbacks Daniel Vetter
2012-12-12 13:07 ` [PATCH 27/37] drm: refcounting for sprite framebuffers Daniel Vetter
2012-12-12 13:07 ` [PATCH 28/37] drm: encapsulate crtc->set_config calls Daniel Vetter
2012-12-12 13:07 ` [PATCH 29/37] drm: refcounting for crtc framebuffers Daniel Vetter
2012-12-12 13:07 ` [PATCH 30/37] drm/i915: dump refcount into framebuffer debugfs file Daniel Vetter
2012-12-12 13:07 ` [PATCH 32/37] drm: optimize drm_framebuffer_remove Daniel Vetter
2012-12-12 13:07 ` [PATCH 34/37] drm/ttm: fix fence locking in ttm_buffer_object_transfer Daniel Vetter
2012-12-12 14:48 ` Jerome Glisse
[not found] ` <CAH3drwbL34+omj2S3ArOPgoYRQ3uzPEiRPFLn7YkP3cOMnPiZg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-12-12 15:42 ` Daniel Vetter
2012-12-13 11:06 ` [PATCH] allow shmob+imx drm drivers to be compiled Daniel Vetter
2012-12-13 11:18 ` Daniel Vetter
2012-12-13 11:26 ` [PATCH] drm/ttm: fix fence locking in ttm_buffer_object_transfer Daniel Vetter
2012-12-12 13:07 ` [PATCH 35/37] drm/radeon: fix fence locking in the pageflip callback Daniel Vetter
2012-12-12 13:07 ` [PATCH 36/37] drm: only grab the crtc lock for pageflips Daniel Vetter
2012-12-12 13:07 ` [PATCH 37/37] drm: don't hold crtc mutexes for connector ->detect callbacks Daniel Vetter
2012-12-12 14:18 ` [PATCH 00/37] [RFC] revamped modeset locking Daniel Vetter
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