From: Jan Kara <jack@suse.cz>
To: linux-mm@kvack.org
Cc: linux-media@vger.kernel.org, Jan Kara <jack@suse.cz>
Subject: [RFC] Helper to abstract vma handling in media layer
Date: Mon, 17 Mar 2014 20:49:27 +0100 [thread overview]
Message-ID: <1395085776-8626-1-git-send-email-jack@suse.cz> (raw)
Hello,
The following patch series is my first stab at abstracting vma handling
from the various media drivers. After this patch set drivers have to know
much less details about vmas, their types, and locking. My motivation for
the series is that I want to change get_user_pages() locking and I want
to handle subtle locking details in as few places as possible.
The core of the series is the new helper get_vaddr_pfns() which is given a
virtual address and it fills in PFNs into provided array. If PFNs correspond to
normal pages it also grabs references to these pages. The difference from
get_user_pages() is that this function can also deal with pfnmap, mixed, and io
mappings which is what the media drivers need.
The patches are just compile tested (since I don't have any of the hardware
I'm afraid I won't be able to do any more testing anyway) so please handle
with care. I'm grateful for any comments.
Honza
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next reply other threads:[~2014-03-17 19:49 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-17 19:49 Jan Kara [this message]
2014-03-17 19:49 ` [PATCH 1/9] mm: Provide new get_vaddr_pfns() helper Jan Kara
2014-03-17 20:53 ` Dave Hansen
2014-03-18 10:25 ` Jan Kara
2015-04-24 16:21 ` Jan Kara
2014-03-17 19:49 ` [PATCH 2/9] media: omap_vout: Convert omap_vout_uservirt_to_phys() to use get_vaddr_pfns() Jan Kara
2014-03-17 19:49 ` [PATCH 3/9] media: vb2: Teach vb2_queue_or_prepare_buf() to get pfns for user buffers Jan Kara
2014-03-17 19:49 ` [PATCH 4/9] media: vb2: Convert vb2_dma_sg_get_userptr() to use pinned pfns Jan Kara
2014-03-17 19:49 ` [PATCH 5/9] media: vb2: Convert vb2_vmalloc_get_userptr() to use pfns vector Jan Kara
2014-03-17 19:49 ` [PATCH 6/9] media: vb2: Convert vb2_dc_get_userptr() " Jan Kara
2014-03-17 19:49 ` [PATCH 7/9] media: vb2: Remove unused functions Jan Kara
2014-03-17 19:49 ` [PATCH 8/9] drm/exynos: Convert g2d_userptr_get_dma_addr() to use get_vaddr_pfn() Jan Kara
2014-03-17 19:49 ` [PATCH 9/9] staging: tidspbridge: Convert to get_vaddr_pfns() Jan Kara
2014-04-10 10:02 ` [RFC] Helper to abstract vma handling in media layer Marek Szyprowski
2014-04-10 10:32 ` Jan Kara
2014-04-10 11:07 ` Hans Verkuil
2014-04-10 12:15 ` Jan Kara
2014-04-10 12:22 ` Hans Verkuil
2014-04-10 21:57 ` Jan Kara
2014-04-10 22:18 ` Jan Kara
2014-04-11 6:58 ` Hans Verkuil
2014-04-14 21:19 ` Jan Kara
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