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DATE 2015-03-01

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Key: id Value: 543071

Key: archive_learn Value: 2015-03-01

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--

  1. 2015-03-01 Ruben <ruben.safir-at-my.liu.edu> Subject: [LIU Comp Sci] Fwd: Re: Linked List Test Question
  2. 2015-03-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [ruben-at-mrbrklyn.com: fork problem]
  3. 2015-03-03 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Re: fork problem
  4. 2015-03-04 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] Mid term in Allorithms
  5. 2015-03-04 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Mid term in Allorithms
  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
  9. 2015-03-04 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] Mid term in Allorithms
  10. 2015-03-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Kanpsack problemi
  11. 2015-03-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Mid term in Allorithms
  12. 2015-03-05 Kamran <kamran.mirzayev-at-my.liu.edu> Re: [LIU Comp Sci] Canonical's 2015 OpenStack Roadshow
  13. 2015-03-05 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] Canonical's 2015 OpenStack Roadshow
  14. 2015-03-05 Ruben <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Forks - Operating systems class
  15. 2015-03-06 Ruben <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] KDE Mentoring -
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  17. 2015-03-07 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Operating Systems class submition
  18. 2015-03-08 From: "keisha.sylvester" <keisha.sylvester-at-my.liu.edu> RE: [LIU Comp Sci] Operating Systems Supplement Text
  19. 2015-03-08 Ruben <ruben.safir-at-my.liu.edu> Re: [LIU Comp Sci] Operating Systems Supplement Text
  20. 2015-03-08 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Operating systems HW
  21. 2015-03-08 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Operating Systems Supplement Text
  22. 2015-03-08 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Re: Operating systems HW
  23. 2015-03-11 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Operating Systems class submition
  24. 2015-03-11 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] February Journal almost completed
  25. 2015-03-16 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] Operating Systems Chapter 3 HW complete
  26. 2015-03-16 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] [ruben-at-mrbrklyn.com: os hw]
  27. 2015-03-17 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Fwd: NYC local: UNIGROUP 19-MAR-2015 (Thu): Penguin Computing presents
  28. 2015-03-19 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] LIU Center for Entrepreneurship + Innovation
  29. 2015-03-20 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Optimum
  30. 2015-03-20 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] [jkeen-at-verizon.net: 2nd New York City Perl Hackathon: hold the
  31. 2015-03-22 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Re: Kernel thread scheduling
  32. 2015-03-22 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] [jkeen-at-verizon.net: New York City Perl Hackathon 2015: Registration
  33. 2015-03-22 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] [vinc94-at-gmail.com: Re: Kernel thread scheduling]
  34. 2015-03-22 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] [xerofoify-at-gmail.com: Re: Kernel thread scheduling]
  35. 2015-03-23 Keisha Sylvester <keisha.sylvester-at-my.liu.edu> Re: [LIU Comp Sci] Meeting Announcement II
  36. 2015-03-23 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Meeting Announcement II
  37. 2015-03-23 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] [gabor-at-szabgab.com: [Perlweekly] #191 - Hackathon after Hackathon]
  38. 2015-03-24 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] GNU/Linux 1
  39. 2015-03-24 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] GNU/Linux 1
  40. 2015-03-24 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] GNU/Linux 1
  41. 2015-03-25 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] GNU/Linux 1
  42. 2015-03-25 Ruben <ruben.safir-at-my.liu.edu> Re: [LIU Comp Sci] GNU/Linux 1
  43. 2015-03-25 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] GNU/Linux 1
  44. 2015-03-25 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] decent threading outline that fills in where our notes let off
  45. 2015-03-25 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] I love this HW problem
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  48. 2015-03-25 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Threaded Programming example
  49. 2015-03-25 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Threads and Speed
  50. 2015-03-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Cpt 4 HW from pr 13-18
  51. 2015-03-26 Ruben <ruben.safir-at-my.liu.edu> Subject: [LIU Comp Sci] Fwd: [NYLXS - HANGOUT] GNU/Linux 1
  52. 2015-03-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Kernel Learning Resource - #1
  53. 2015-03-27 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] AVl Trees
  54. 2015-03-27 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Re: Cpt 4 HW Programming Project 4-20 (and 3-20)
  55. 2015-03-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Jobs
  56. 2015-03-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] JOUNAL MEETING AT 10AM TOMORROW
  57. 2015-03-29 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Fwd: usage of dma_common_mmap
  58. 2015-03-30 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] HW 4.18 Problem

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