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From: "Figo.zhang" <figo1802@gmail.com>
To: linux-media <linux-media@vger.kernel.org>
Cc: linux-media@vger.kernel.org
Subject: how to mmap in  videobuf-dma-sg.c
Date: Thu, 21 May 2009 12:46:04 +0800	[thread overview]
Message-ID: <1242881164.3824.2.camel@myhost> (raw)

hi,all,
 I am puzzle that how to mmap ( V4L2_MEMORY_MMAP) in videobuf-dma-sg.c?

In this file, it alloc the momery using vmalloc_32() , and put this
momery into sglist table,and then use dma_map_sg() to create sg dma at
__videobuf_iolock() function. but in __videobuf_mmap_mapper(), i canot
understand how it do the mmap? 
why it not use the remap_vmalloc_range() to do the mmap?

Thanks ,


             reply	other threads:[~2009-05-21  4:46 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-21  4:46 Figo.zhang [this message]
2009-05-21 10:35 ` how to mmap in videobuf-dma-sg.c Mauro Carvalho Chehab
2009-05-21 10:48   ` Figo.zhang
2009-06-10 15:06     ` Figo.zhang
2010-07-24 13:43   ` Figo.zhang
     [not found]   ` <AANLkTimExb4hh8K5lRCRiM0IMIgsOpCw69bFvqLlQCDc@mail.gmail.com>
2010-07-25 17:46     ` Mauro Carvalho Chehab
2010-07-26  8:16       ` Laurent Pinchart

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