From: Tony Lindgren <tony@atomide.com>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: linux-omap@vger.kernel.org
Subject: Re: [PATCH v2 1/2] omap3: iovmm: Work around sg_alloc_table size limitation in IOMMU
Date: Wed, 1 Jun 2011 06:11:44 -0700 [thread overview]
Message-ID: <20110601131144.GG11352@atomide.com> (raw)
In-Reply-To: <1306931102-10943-1-git-send-email-laurent.pinchart@ideasonboard.com>
* Laurent Pinchart <laurent.pinchart@ideasonboard.com> [110601 05:21]:
> sg_alloc_table can only allocate multi-page scatter-gather list tables
> if the architecture supports scatter-gather lists chaining. ARM doesn't
> fit in that category.
>
> The IOMMU driver abuses the sg table structure only to hold page
> addresses without ever passing the table to the device.
>
> Use __sg_alloc_table instead of sg_alloc_table and allocate all entries
> in one go. Otherwise trying to use a large userspace to capture video
> will hit a BUG_ON in __sg_alloc_table.
Is the "large userspace" above missing a word like buffer?
Tony
next prev parent reply other threads:[~2011-06-01 13:11 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-30 12:47 [PATCH 0/2] OMAP3 IOMMU fixes Laurent Pinchart
2011-05-30 12:47 ` [PATCH 1/2] omap3: iovmm: Work around sg_alloc_table size limitation in IOMMU Laurent Pinchart
2011-05-31 13:22 ` Tony Lindgren
2011-06-01 12:25 ` [PATCH v2 " Laurent Pinchart
2011-06-01 13:11 ` Tony Lindgren [this message]
2011-06-01 12:25 ` [PATCH v2 2/2] omap3: iovmm: Support non page-aligned buffers in iommu_vmap Laurent Pinchart
2011-06-01 12:50 ` Tony Lindgren
2011-06-01 13:09 ` Laurent Pinchart
2011-06-01 13:10 ` Tony Lindgren
2011-06-01 13:17 ` Tony Lindgren
2011-06-01 13:30 ` [PATCH v3 1/2] omap3: iovmm: Work around sg_alloc_table size limitation in IOMMU Laurent Pinchart
2011-06-01 13:30 ` Laurent Pinchart
2011-06-01 13:43 ` Russell King - ARM Linux
2011-06-01 13:43 ` Russell King - ARM Linux
2011-06-01 13:50 ` Laurent Pinchart
2011-06-01 13:50 ` Laurent Pinchart
2011-06-01 14:03 ` Russell King - ARM Linux
2011-06-01 14:03 ` Russell King - ARM Linux
2011-06-03 0:12 ` Laurent Pinchart
2011-06-03 0:12 ` Laurent Pinchart
2011-06-03 6:32 ` Russell King - ARM Linux
2011-06-03 6:32 ` Russell King - ARM Linux
2011-06-06 16:23 ` Laurent Pinchart
2011-06-06 16:23 ` Laurent Pinchart
2011-06-06 16:44 ` Russell King - ARM Linux
2011-06-06 16:44 ` Russell King - ARM Linux
2011-06-06 16:54 ` Laurent Pinchart
2011-06-06 16:54 ` Laurent Pinchart
2011-06-06 18:00 ` Russell King - ARM Linux
2011-06-06 18:00 ` Russell King - ARM Linux
2011-06-08 10:33 ` Laurent Pinchart
2011-06-08 10:33 ` Laurent Pinchart
2011-06-03 9:39 ` Felipe Contreras
2011-06-03 9:39 ` Felipe Contreras
2011-06-01 13:30 ` [PATCH v3 2/2] omap3: iovmm: Support non page-aligned buffers in iommu_vmap Laurent Pinchart
2011-06-01 13:30 ` Laurent Pinchart
2011-05-30 12:47 ` [PATCH " Laurent Pinchart
2011-05-30 13:16 ` [PATCH 0/2] OMAP3 IOMMU fixes Hiroshi DOYU
2011-06-08 10:48 ` Laurent Pinchart
2011-06-13 13:40 ` Tony Lindgren
2011-06-13 16:41 ` Laurent Pinchart
2011-06-13 19:34 ` Ohad Ben-Cohen
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