From: Eric Anholt <eric@anholt.net>
To: Rob Herring <robh@kernel.org>, Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel <dri-devel@lists.freedesktop.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Will Deacon <will.deacon@arm.com>,
Robin Murphy <robin.murphy@arm.com>,
Joerg Roedel <joro@8bytes.org>,
"list\@263.net\:IOMMU DRIVERS
\<iommu\@lists.linux-foundation.org\>\,
Joerg Roedel \<joro\@8bytes.org\>\,"
<iommu@lists.linux-foundation.org>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <maxime.ripard@bootlin.com>,
Sean Paul <sean@poorly.run>, David Airlie <airlied@linux.ie>,
Alyssa Rosenzweig <alyssa@rosenzweig.io>,
Lyude Paul <lyude@redhat.com>,
Neil Armstrong <narmstrong@baylibre.com>
Subject: Re: [PATCH v2 2/3] drm: Add a drm_gem_objects_lookup helper
Date: Mon, 01 Apr 2019 11:22:14 -0700 [thread overview]
Message-ID: <87sgv14mcp.fsf@anholt.net> (raw)
In-Reply-To: <CAL_JsqJ4uppXc_Sti67z0ZBJ4sw1RPgNHCg6usqpUmbQcGQmpQ@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 2508 bytes --]
Rob Herring <robh@kernel.org> writes:
> On Mon, Apr 1, 2019 at 8:07 AM Daniel Vetter <daniel@ffwll.ch> wrote:
>>
>> On Mon, Apr 1, 2019 at 9:47 AM Rob Herring <robh@kernel.org> wrote:
>> >
>> > Similar to the single handle drm_gem_object_lookup(),
>> > drm_gem_objects_lookup() takes an array of handles and returns an array
>> > of GEM objects.
>> >
>> > Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
>> > Cc: Maxime Ripard <maxime.ripard@bootlin.com>
>> > Cc: Sean Paul <sean@poorly.run>
>> > Cc: David Airlie <airlied@linux.ie>
>> > Cc: Daniel Vetter <daniel@ffwll.ch>
>> > Signed-off-by: Rob Herring <robh@kernel.org>
>> > ---
>> > drivers/gpu/drm/drm_gem.c | 46 +++++++++++++++++++++++++++++++--------
>> > include/drm/drm_gem.h | 2 ++
>> > 2 files changed, 39 insertions(+), 9 deletions(-)
>> >
>> > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
>> > index 388b3742e562..5c9bff45e5e1 100644
>> > --- a/drivers/gpu/drm/drm_gem.c
>> > +++ b/drivers/gpu/drm/drm_gem.c
>> > @@ -663,6 +663,42 @@ void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
>> > }
>> > EXPORT_SYMBOL(drm_gem_put_pages);
>> >
>> > +/**
>> > + * drm_gem_objects_lookup - look up GEM objects from an array of handles
>> > + * @filp: DRM file private date
>> > + * @handle: pointer to array of userspace handle
>> > + * @count: size of handle array
>> > + * @objs: pointer to array of drm_gem_object pointers
>> > + *
>> > + * Returns:
>> > + *
>> > + * @objs filled in with GEM object pointers. -ENOENT is returned on a lookup
>> > + * failure. 0 is returned on success.
>>
>> Bonus points for adding references between the array and normal lookup
>> functions to guide people around. Also a comment that the buffers need
>> to be released with drm_gem_object_put().
>>
>> > + */
>> > +int drm_gem_objects_lookup(struct drm_file *filp, u32 *handle, int count,
>> > + struct drm_gem_object **objs)
>>
>> With a pointer to a pointer I'd expect this function to do the
>> allocation, but it doesn't. Normal pointer is enough to pass an array.
>> Also maybe make the handle pointer
>> const, so it's clear that it's an input parameter.
>
> I thought about doing the allocation here, but then I couldn't
> implement the single drm_gem_object_lookup() using this function.
> Maybe I can refactor in 3 functions making this one a static function.
FWIW, I was thinking for v3d that I'd probably add a helper that took in
the user's pointer to handles :)
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 832 bytes --]
next prev parent reply other threads:[~2019-04-01 18:22 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-01 7:47 [PATCH v2 0/3] Initial Panfrost driver Rob Herring
2019-04-01 7:47 ` [PATCH v3 1/3] iommu: io-pgtable: Add ARM Mali midgard MMU page table format Rob Herring
2019-04-01 19:11 ` Robin Murphy
2019-04-05 10:02 ` Robin Murphy
2019-04-11 13:15 ` Joerg Roedel
2019-04-05 9:42 ` Steven Price
2019-04-05 9:51 ` Robin Murphy
2019-04-05 10:36 ` Steven Price
2019-04-08 8:56 ` Steven Price
2019-04-01 7:47 ` [PATCH v2 2/3] drm: Add a drm_gem_objects_lookup helper Rob Herring
2019-04-01 13:06 ` Daniel Vetter
2019-04-01 13:48 ` Chris Wilson
2019-04-01 15:43 ` Eric Anholt
2019-04-08 20:09 ` Rob Herring
2019-04-09 16:55 ` Eric Anholt
2019-04-01 16:59 ` Rob Herring
2019-04-01 18:22 ` Eric Anholt [this message]
2019-04-01 7:47 ` [PATCH v2 3/3] drm/panfrost: Add initial panfrost driver Rob Herring
2019-04-01 8:24 ` Neil Armstrong
2019-04-01 19:17 ` Robin Murphy
2019-04-01 16:02 ` Eric Anholt
2019-04-01 19:12 ` Robin Murphy
2019-04-02 0:33 ` Alyssa Rosenzweig
2019-04-02 11:23 ` Robin Murphy
2019-04-03 4:57 ` Rob Herring
2019-04-05 12:57 ` Robin Murphy
2019-04-05 12:30 ` Steven Price
2019-04-05 16:16 ` Alyssa Rosenzweig
2019-04-05 16:42 ` Steven Price
2019-04-05 16:53 ` Alyssa Rosenzweig
2019-04-15 9:18 ` Daniel Vetter
2019-04-15 9:30 ` Steven Price
2019-04-16 7:51 ` Daniel Vetter
2019-04-08 21:04 ` Rob Herring
2019-04-09 15:56 ` Tomeu Vizoso
2019-04-09 16:15 ` Rob Herring
2019-04-10 10:28 ` Steven Price
2019-04-10 10:19 ` Steven Price
2019-04-10 11:50 ` Tomeu Vizoso
2019-04-01 15:05 ` [PATCH v2 0/3] Initial Panfrost driver Alyssa Rosenzweig
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=87sgv14mcp.fsf@anholt.net \
--to=eric@anholt.net \
--cc=airlied@linux.ie \
--cc=alyssa@rosenzweig.io \
--cc=daniel@ffwll.ch \
--cc=dri-devel@lists.freedesktop.org \
--cc=iommu@lists.linux-foundation.org \
--cc=joro@8bytes.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=lyude@redhat.com \
--cc=maarten.lankhorst@linux.intel.com \
--cc=maxime.ripard@bootlin.com \
--cc=narmstrong@baylibre.com \
--cc=robh@kernel.org \
--cc=robin.murphy@arm.com \
--cc=sean@poorly.run \
--cc=will.deacon@arm.com \
/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).