linux-kernel - [PATCH 2/4] dma-mapping: add get_required

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Message-Id: <1308942325-4813-3-git-send-email-nacc@us.ibm.com>
Date:	Fri, 24 Jun 2011 12:05:23 -0700
From:	Nishanth Aravamudan <nacc@...ibm.com>
To:	Milton Miller <miltonm@....com>
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	benh@...nel.crashing.org, Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>
Subject: [PATCH 2/4] dma-mapping: add get_required_mask if arch overrides default

From: Milton Miller <miltonm@....com>

If an architecture sets ARCH_HAS_DMA_GET_REQUIRED_MASK and has settable
dma_map_ops, the required mask may change by the ops implementation.
For example, a system that always has an mmu inline may only require 32
bits while a swiotlb would desire bits to cover all of memory.

Therefore add the field if the architecture does not use the generic
definition of dma_get_required_mask. The first use will by by powerpc.
Note that this does add some dependency on the order in which files are
visible here.

Signed-off-by:  Milton Miller <miltonm@....com>
Signed-off-by: Nishanth Aravamudan <nacc@...ibm.com>
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org
Cc: benh@...nel.crashing.org
---
 include/linux/dma-mapping.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index ba8319a..d0e023b 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -49,6 +49,9 @@ struct dma_map_ops {
 	int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
 	int (*dma_supported)(struct device *dev, u64 mask);
 	int (*set_dma_mask)(struct device *dev, u64 mask);
+#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
+	u64 (*get_required_mask)(struct device *dev);
+#endif
 	int is_phys;
 };
 
-- 
1.7.4.1

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