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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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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next reply other threads:[~2014-03-17 19:49 UTC|newest] Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-03-17 19:49 Jan Kara [this message] 2014-03-17 19:49 ` [RFC] Helper to abstract vma handling in media layer Jan Kara 2014-03-17 19:49 ` [PATCH 1/9] mm: Provide new get_vaddr_pfns() helper Jan Kara 2014-03-17 19:49 ` Jan Kara 2014-03-17 20:53 ` Dave Hansen 2014-03-17 20:53 ` Dave Hansen 2014-03-18 10:25 ` Jan Kara 2014-03-18 10:25 ` Jan Kara 2015-04-24 16:21 ` 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 ` 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 ` 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 ` 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 ` Jan Kara 2014-03-17 19:49 ` [PATCH 6/9] media: vb2: Convert vb2_dc_get_userptr() " Jan Kara 2014-03-17 19:49 ` Jan Kara 2014-03-17 19:49 ` [PATCH 7/9] media: vb2: Remove unused functions Jan Kara 2014-03-17 19:49 ` 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 ` Jan Kara 2014-03-17 19:49 ` [PATCH 9/9] staging: tidspbridge: Convert to get_vaddr_pfns() Jan Kara 2014-03-17 19:49 ` Jan Kara 2014-04-10 10:02 ` [RFC] Helper to abstract vma handling in media layer Marek Szyprowski 2014-04-10 10:02 ` Marek Szyprowski 2014-04-10 10:32 ` Jan Kara 2014-04-10 10:32 ` Jan Kara 2014-04-10 11:07 ` Hans Verkuil 2014-04-10 11:07 ` Hans Verkuil 2014-04-10 12:15 ` Jan Kara 2014-04-10 12:15 ` Jan Kara 2014-04-10 12:22 ` Hans Verkuil 2014-04-10 12:22 ` Hans Verkuil 2014-04-10 21:57 ` Jan Kara 2014-04-10 21:57 ` Jan Kara 2014-04-10 22:18 ` Jan Kara 2014-04-10 22:18 ` Jan Kara 2014-04-11 6:58 ` Hans Verkuil 2014-04-11 6:58 ` Hans Verkuil 2014-04-14 21:19 ` Jan Kara 2014-04-14 21:19 ` Jan Kara
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