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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman";font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman"">
kernelnewbies-bounces@kernelnewbies.org [mailto:kernelnewbies-bounces@kernelnewbies.org]
<b><span style="font-weight:bold">On Behalf Of </span></b>?????? ???????<br>
<b><span style="font-weight:bold">Sent:</span></b> Tuesday, January 21, 2014 1:45 AM<br>
<b><span style="font-weight:bold">To:</span></b> kernelnewbies@kernelnewbies.org<br>
<b><span style="font-weight:bold">Subject:</span></b> mmap CMA area on /dev/mem<o:p></o:p></span></font></p>
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<p><font size="3" face="Times New Roman"><span style="font-size:12.0pt">Hello everyone!
<br>
I need reserve 256-512 Mb of continuous physical memory and have access to this memory from the user space.
<br>
I decided to use CMA for memory reserving. <br>
Here are the steps on my idea that must be performed:<br>
1. Reservation required amount of memory by CMA during system booting.<br>
2. Parsing of CMA patch output which looks like for example: "CMA: reserved 256 MiB at 27400000" and saving two parameters: size of CMA area = 256*1024*1024 bytes and phys address of CMA area = 0x27400000.<br>
3. Mapping of CMA area at /dev/mem file with offset = 0x27400000 using mmap(). (Of course, </span></font><font size="2" face="Arial"><span style="font-size:10.5pt;font-family:"Arial","sans-serif"">CONFIG_STRICT_DEVMEM is disabled)</span></font><br>
It would let me to read data directly from phys memory from user space.<br>
<br>
But the next code make segmentation fault(there size = 1Mb):<o:p></o:p></p>
<p><font size="3" face="Times New Roman"><span style="font-size:12.0pt">int file;<br>
void* start;<o:p></o:p></span></font></p>
<p><font size="3" face="Times New Roman"><span style="font-size:12.0pt">file=open("/dev/mem", O_RDWR | O_SYNC);<o:p></o:p></span></font></p>
<p><font size="3" face="Times New Roman"><span style="font-size:12.0pt">if ( (start = mmap(0, 1024*1024, PROT_READ | PROT_WRITE, MAP_SHARED, file, 0x27400000)) == MAP_FAILED ){<br>
perror("mmap");<br>
}<o:p></o:p></span></font></p>
<p><font size="3" face="Times New Roman"><span style="font-size:12.0pt">for (int offs = 0; offs<50; offs++){<br>
cout<<((char *)start)[offs];<br>
}<o:p></o:p></span></font></p>
<p><font size="3" face="Times New Roman"><span style="font-size:12.0pt">Output of this code: "mmap: Invalid argument".<o:p></o:p></span></font></p>
<p><font size="3" face="Times New Roman"><span style="font-size:12.0pt">When I changed offset = 0x27400000 on 0, this code worked fine and program displayed trash. It also work for alot of offsets which I looked at /proc/iomem.<br>
According to information from /proc/iomem, phys addr of CMA area (0x27400000 on my system) always situated in System RAM.<o:p></o:p></span></font></p>
<p><font size="3" face="Times New Roman"><span style="font-size:12.0pt">Does anyone have any ideas, how to mmap CMA area on /dev/mem? What am I doing wrong?<br>
Thanks alot for any help!<o:p></o:p></span></font></p>
<p style="margin-bottom:12.0pt"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><br>
<font color="#1f497d"><span style="color:#1F497D">You don’t say what kind of processor you are running this on, but if its x86_64 you might want to look at your kernel configuration. If CONFIG_X86_PAT is configured you will have problems mapping memory to user
space. It basically implements the same restrictions as CONFIG_STRICT_DEVMEM.</span></font><o:p></o:p></span></font></p>
<p style="margin-bottom:12.0pt"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">Jeff Haran<o:p></o:p></span></font></p>
<p style="margin-bottom:12.0pt"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></font></p>
<p style="margin-bottom:12.0pt"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></font></p>
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