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DATE 2015-03-01

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MESSAGE
DATE 2015-03-29
FROM Ruben Safir
SUBJECT Subject: [LIU Comp Sci] Fwd: usage of dma_common_mmap
From owner-learn-outgoing-at-mrbrklyn.com Sun Mar 29 01:27:18 2015
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Subject: [LIU Comp Sci] Fwd: usage of dma_common_mmap
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-------- Forwarded Message --------
Subject: usage of dma_common_mmap
Date: Sun, 29 Mar 2015 05:28:09 +0100
From: Malte Vesper
To: kernelnewbies

Hello,

I am trying to use dma_mmap_attrs . However I keep getting the following
error:

mmap:6420 map pfn RAM range req uncached-minus for [mem
0xfd0000000-0xfd0000fff], got write-back


Assuming that dma_common_map is used
(http://lxr.free-electrons.com/source/drivers/base/dma-mapping.c#L246) I
tracked the error source to be comming from: remap_pfn_range
After struding the codeflow I think that this macro is the culprit:

12 #define pgprot_noncached(prot) \
13 ((boot_cpu_data.x86 >
3) \
14 ? (__pgprot(pgprot_val(prot)
| \
15 cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS))) \
16 : (prot))

since the "got write-back" is calculated from the memory address I
assume I can not change that bit.
Could anyone explain to me, why the page protection depends on
boot_cpu_data?

Googling turned up further hints
http://comments.gmane.org/gmane.linux.kernel.mm/125059. Is this a Bug or
am I missing something?
How do I correctly use dma_mmap_attrs? Currently I try:


mmap function:

return dma_mmap_attrs(&pcidev->dev, vma, buffer->memoryAddress,
buffer->dmaAddress, BUF_SIZE, 0);


testfile:

char* fpath = "/proc/myDevice";
uint64_t* buffer;
int filepointer = open(fpath, O_RDWR);

if(filepointer < 0) {
printf("Could not open %s.\n", fpath);
return -1;
}

buffer = (uint64_t*) mmap(0, 4096, PROT_READ | PROT_WRITE,
MAP_PRIVATE, filepointer, 0);

Thanks for any help,
Malte




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--------------070807020400070500020505--

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  4. 2015-03-04 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] Mid term in Allorithms
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  6. 2015-03-04 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] Mid term in Allorithms
  7. 2015-03-04 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Mid term in Allorithms
  8. 2015-03-04 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [LIU Comp Sci] Mid term in Allorithms
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  18. 2015-03-08 From: "keisha.sylvester" <keisha.sylvester-at-my.liu.edu> RE: [LIU Comp Sci] Operating Systems Supplement Text
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  34. 2015-03-22 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] [xerofoify-at-gmail.com: Re: Kernel thread scheduling]
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  38. 2015-03-24 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] GNU/Linux 1
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