From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: "Herrera-Bendezu, Luis" <lherrera@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] [Xenomai -help] User space access to DMA memory
Date: Wed, 12 Jan 2011 21:20:26 +0100 [thread overview]
Message-ID: <4D2E0D0A.4050700@domain.hid> (raw)
In-Reply-To: <6FCCA913376DD7488F4139A4D11B8F48016741F6@domain.hid>
Herrera-Bendezu, Luis wrote:
>> Simply call rtdm_mmap_noncached_to_user instead of rtdm_mmap_to_user.
>>
>
> Get same kernel panic error as before with this patch. I need to look closer
> at what are the memory allocation functions used by pci_ and dma_.
You need to look closely into rtdm_mmap_to_buffer what physical address
gets passed to the mapping function (should be xnarch_remap_vm_page, as
the virtual address being mapped non cacheable, it probably belongs to
the vmalloc area). In particular, it should be the same as the
dma_addr_t returned by pci_alloc_consistent.
--
Gilles.
next prev parent reply other threads:[~2011-01-12 20:20 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-20 16:52 [Xenomai-help] [Xenomai -help] User space access to DMA memory Herrera-Bendezu, Luis
2011-01-01 22:44 ` Gilles Chanteperdrix
2011-01-05 21:03 ` Herrera-Bendezu, Luis
2011-01-05 21:33 ` Gilles Chanteperdrix
2011-01-05 22:07 ` Steven A. Falco
2011-01-05 22:29 ` Gilles Chanteperdrix
2011-01-06 13:48 ` Herrera-Bendezu, Luis
2011-01-06 13:55 ` Gilles Chanteperdrix
2011-01-11 23:27 ` Gilles Chanteperdrix
2011-01-12 13:14 ` Herrera-Bendezu, Luis
2011-01-12 13:35 ` Gilles Chanteperdrix
2011-01-12 16:03 ` Herrera-Bendezu, Luis
2011-01-12 16:26 ` Gilles Chanteperdrix
2011-01-12 18:16 ` Herrera-Bendezu, Luis
2011-01-12 20:20 ` Gilles Chanteperdrix [this message]
2011-01-12 20:36 ` Gilles Chanteperdrix
2011-01-12 21:57 ` Herrera-Bendezu, Luis
2011-01-12 22:11 ` Philippe Gerum
2011-01-12 22:14 ` Gilles Chanteperdrix
2011-01-12 22:18 ` Gilles Chanteperdrix
2011-01-12 22:45 ` Gilles Chanteperdrix
2011-01-13 8:27 ` Philippe Gerum
2011-01-13 8:33 ` Gilles Chanteperdrix
2011-01-12 22:15 ` Gilles Chanteperdrix
2011-01-06 14:32 ` Steven A. Falco
2011-01-06 14:44 ` Gilles Chanteperdrix
2011-01-06 14:45 ` Steven A. Falco
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