Hi Bhaskar,
You can not do DMA with a pseudo device. The call to
ddi_dma_alloc_handle(9f) calls
into the nexus driver above the device. The nexus driver for pseudo
devices does
not support DMA. What are you trying to accomplish with your pseudo
device that
makes you think you need to do DMA?
max
Jayaraman, Bhaskar wrote:
Max yes I'm assigning smu_generic_dma_attr to tmp_dma_attr before making the
call. I've tried a bunch of things like changing the attributes but I still
keep getting the error. Would switching to DDI_DMA_FORCE_PHYSICAL be advised?
Since I'm writing this driver for a pseudo device I'm sure IOMMU virtual
addresses won't be used.
Bhaskar.
-----Original Message-----
From: m...@bruningsystems.com [mailto:m...@bruningsystems.com]
Sent: Friday, November 13, 2009 4:01 PM
To: Jayaraman, Bhaskar
Cc: opensolaris-code@opensolaris.org
Subject: Re: [osol-code] DDI_DMA_BADATTR error!
Hi Bhaskar,
Jayaraman, Bhaskar wrote:
Hi I'm using an x86 vm which has an emulated IOMMU on it. The following are the
attributes that I'm passing to ddi_dma_alloc_handle
static ddi_dma_attr_t smu_generic_dma_attr = {
DMA_ATTR_V0, /* dma_attr_version */
(unsigned long long)0, /* low DMA address
range */
(unsigned long long)0xffffffff, /* high DMA address range */
(unsigned long long)0xffffffff, /* DMA counter register */
8, /* DMA address alignment */
0x07, /* DMA burstsizes */
1, /* min DMA size */
(unsigned long long)0xffffffff, /* max DMA size */
(unsigned long long)0xffffffff, /* segment boundary */
16, /* dma_attr_sglen */
512, /* granularity of device */
0 /* bus specific DMA flags */
};
The call I make is ddi_dma_alloc_handle (instance->dip, &tmp_dma_attr,
DDI_DMA_DONTWAIT, 0, &acmd->cmd_dmahandle)
I assume you are assigning tmp_dma_attr to smu_generic_dma_attr before
making this call? What happens if you pass &smu_generic_dma_attr instead
of &tmp_dma_attr?
max
In the 3rd parameter, I've tried using DDI_DMA_SLEEP as well but I still get
the DDI_DMA_BADATTR error from the API.
I don't see where I'm going wrong in making the call.
Regards,
Bhaskar.
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