Re: [Linux-fbdev-devel] How to mmap a shadow framebuffer in virtual memory

[Bernardo Innocenti <bernie@develer.com>]

Bernardo Innocenti wrote:

> I still couldn't solve my problem, but thanks for helping.
> 
> The way you map memory in ps3fb_mmap() is basically the same.
> In my case, memory is allocated with __get_free_pages() instead
> of being at an absolute physical address, but I can't see how
> it could make any difference.

A few weeks ago I found the solution, which I report here to help
people who are googling for the same problem.

consistent_alloc() performed all the required magic to allocate
a contiguous buffer in phisical memory:

 -       if (!(fb_info.shadow = (void *)__get_free_pages(GFP_KERNEL, OLED_MEMORDER))
 +       if (!(fb_info.shadow = consistent_alloc(GFP_KERNEL, PAGE_ALIGN(OLED_MEMSIZE),
 +                       &fb_info.shadow_phys, PTE_BUFFERABLE))


The complete patch set is here, just in case:

   http://www.develer.com/patches/linux/pending/

-- 
   // Bernardo Innocenti - Develer S.r.l., R&D dept.
 \X/  http://www.develer.com/