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Some ia64 platforms may not support write combining on all type of memory,

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so we need to consult the EFI memory map before we try to set the write
    combine attribute of a page. This patch will try to map a page write
    combined if it's not an AGP page and the EFI memory map says it's ok,
    otherwise it falls back to a regular, uncached mapping. Can someone
    please apply this to the drm tree?
From: Jesse Barnes
This commit is contained in:
Dave Airlie 2005-03-27 06:58:12 +00:00
parent 459ef48629
commit 385f927692
1 changed files with 9 additions and 2 deletions
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11
linux-core/drm_vm.c
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@ -34,6 +34,9 @@
*/
#include "drmP.h"
#if defined(__ia64__)
#include <linux/efi.h>
#endif
/**
* \c nopage method for AGP virtual memory.
@ -639,9 +642,13 @@ int drm_mmap(struct file *filp, struct vm_area_struct *vma)
vma->vm_flags |= VM_IO; /* not in core dump */
}
#if defined(__ia64__)
if (map->type != _DRM_AGP)
if (efi_range_is_wc(vma->vm_start, vma->vm_end -
vma->vm_start))
vma->vm_page_prot =
pgprot_writecombine(vma->vm_page_prot);
pgprot_writecombine(vma->vm_page_prot);
else
vma->vm_page_prot =
pgprot_noncached(vma->vm_page_prot);
#endif
offset = dev->driver->get_reg_ofs(dev);
#ifdef __sparc__