From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Bottomley Subject: [PATCHv2 2/5] parisc: add mm API for DMA to vmalloc/vmap areas Date: Wed, 23 Dec 2009 15:22:22 -0600 Message-ID: <1261603345-2494-3-git-send-email-James.Bottomley@suse.de> References: <1261603345-2494-1-git-send-email-James.Bottomley@suse.de> <1261603345-2494-2-git-send-email-James.Bottomley@suse.de> Return-path: Received: from cantor2.suse.de ([195.135.220.15]:58588 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757274AbZLWVWz (ORCPT ); Wed, 23 Dec 2009 16:22:55 -0500 In-Reply-To: <1261603345-2494-2-git-send-email-James.Bottomley@suse.de> Sender: linux-arch-owner@vger.kernel.org List-ID: To: linux-arch@vger.kernel.org Cc: linux-parisc@vger.kernel.org, Christoph Hellwig , Russell King , Paul Mundt , James Bottomley We already have an API to flush a kernel page along an alias address, so use it. The TLB purge prevents the CPU from doing speculative moveins on the flushed address, so we don't need to implement and invalidate. Signed-off-by: James Bottomley --- arch/parisc/include/asm/cacheflush.h | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/arch/parisc/include/asm/cacheflush.h b/arch/parisc/include/asm/cacheflush.h index 7a73b61..4772777 100644 --- a/arch/parisc/include/asm/cacheflush.h +++ b/arch/parisc/include/asm/cacheflush.h @@ -38,6 +38,18 @@ void flush_cache_mm(struct mm_struct *mm); #define flush_kernel_dcache_range(start,size) \ flush_kernel_dcache_range_asm((start), (start)+(size)); +/* vmap range flushes and invalidates. Architecturally, we don't need + * the invalidate, because the CPU should refuse to speculate once an + * area has been flushed, so invalidate is left empty */ +static inline void flush_kernel_vmap_range(void *vaddr, int size) +{ + unsigned long start = (unsigned long)vaddr; + + flush_kernel_dcache_range_asm(start, start + size); +} +static inline void invalidate_kernel_vmap_range(void *vaddr, int size) +{ +} #define flush_cache_vmap(start, end) flush_cache_all() #define flush_cache_vunmap(start, end) flush_cache_all() -- 1.6.5