linux-kernel - Re: [PATCH 00 of 14] swiotlb/x86: lay groundwork for xen dom0 use of swiotlb

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Date:	Tue, 16 Dec 2008 21:35:13 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	linux-kernel@...r.kernel.org,
	Xen-devel <xen-devel@...ts.xensource.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	Jan Beulich <jbeulich@...ell.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Joerg Roedel <joerg.roedel@....com>
Subject: Re: [PATCH 00 of 14] swiotlb/x86: lay groundwork for xen dom0 use
	of swiotlb


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Hi Ingo,
> 
> Here's some patches to clean up swiotlb to prepare for some Xen dom0 
> patches.  These have been posted before, but undergone a round of 
> cleanups to address various comments.

applied to tip/core/iommu, thanks Jeremy.

the only patch that seems to have the potential to break drivers is:

  be4ac7b: swiotlb: consistently use address_needs_mapping everywhere

looks fine to me, but the gents on the Cc: might have a dissenting 
opinion?

	Ingo

------------->
>From be4ac7b87b27380bc43fa4f686e39b46eca2c866 Mon Sep 17 00:00:00 2001
From: Jeremy Fitzhardinge <jeremy@...p.org>
Date: Tue, 16 Dec 2008 12:17:28 -0800
Subject: [PATCH] swiotlb: consistently use address_needs_mapping everywhere

Impact: remove open-coded DMA mask assumptions

Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 lib/swiotlb.c |   10 +++-------
 1 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index db724ba..76821f0 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -465,13 +465,9 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 	dma_addr_t dev_addr;
 	void *ret;
 	int order = get_order(size);
-	u64 dma_mask = DMA_32BIT_MASK;
-
-	if (hwdev && hwdev->coherent_dma_mask)
-		dma_mask = hwdev->coherent_dma_mask;
 
 	ret = (void *)__get_free_pages(flags, order);
-	if (ret && !is_buffer_dma_capable(dma_mask, virt_to_bus(ret), size)) {
+	if (ret && !address_needs_mapping(hwdev, virt_to_bus(ret), size)) {
 		/*
 		 * The allocated memory isn't reachable by the device.
 		 * Fall back on swiotlb_map_single().
@@ -495,9 +491,9 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 	dev_addr = virt_to_bus(ret);
 
 	/* Confirm address can be DMA'd by device */
-	if (!is_buffer_dma_capable(dma_mask, dev_addr, size)) {
+	if (!address_needs_mapping(hwdev, dev_addr, size)) {
 		printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
-		       (unsigned long long)dma_mask,
+		       (unsigned long long)dma_get_mask(hwdev),
 		       (unsigned long long)dev_addr);
 
 		/* DMA_TO_DEVICE to avoid memcpy in unmap_single */
--
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