Re: [PATCH] powerpc: Add pgprot_writecombine
flat view
From: Nishanth Aravamudan <hidden>
Date: 2011-03-14 18:33:31
On 01.03.2011 [17:00:47 +1100], Anton Blanchard wrote:
A number of drivers are using pgprot_writecombine() to enable write combining on userspace mappings. Implement it on powerpc.
Given this patch, should drivers/infiniband/hw/cxgb4/t4.h
be updated?:
static inline pgprot_t t4_pgprot_wc(pgprot_t prot)
{
#if defined(__i386__) || defined(__x86_64__)
return pgprot_writecombine(prot);
#elif defined(CONFIG_PPC64)
return __pgprot((pgprot_val(prot) | _PAGE_NO_CACHE) &
~(pgprot_t)_PAGE_GUARDED);
#else
return pgprot_noncached(prot);
#endif
}
Thanks,
Nish
quoted hunk ↗ jump to hunk
Signed-off-by: Anton Blanchard <redacted> ---diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h index 89f1587..88b0bd9 100644 --- a/arch/powerpc/include/asm/pgtable.h +++ b/arch/powerpc/include/asm/pgtable.h@@ -170,6 +170,7 @@ extern int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long addre #define pgprot_cached_wthru(prot) (__pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) | \ _PAGE_COHERENT | _PAGE_WRITETHRU)) +#define pgprot_writecombine pgprot_noncached_wc struct file; extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,_______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
-- Nishanth Aravamudan [off-list ref] IBM Linux Technology Center