Re: [PATCH linux-2.6 03/03] i386_and_x86_64: check broken_dac to x86_64 dma_supported()

[Tejun Heo <htejun@gmail.com>]

03_i386_and_x86_64_add-broken-dac-check-to-x86_64.patch

	check for broken_dac in x86-64 dma_supported() routine.  This
	disables 64-bit DMA for devices hanging off broken bridges.

Signed-off-by: Tejun Heo <htejun@gmail.com>

 arch/x86_64/kernel/pci-gart.c  |    5 +++++
 arch/x86_64/kernel/pci-nommu.c |    7 +++++++
 include/asm-x86_64/proto.h     |    3 +++
 3 files changed, 15 insertions(+)

Index: linux-work/arch/x86_64/kernel/pci-gart.c
===================================================================
--- linux-work.orig/arch/x86_64/kernel/pci-gart.c	2005-09-28 21:41:46.000000000 +0900
+++ linux-work/arch/x86_64/kernel/pci-gart.c	2005-09-28 21:41:46.000000000 +0900
@@ -645,6 +645,11 @@ int dma_supported(struct device *dev, u6
 		return 0; 
 	}
 
+	/* Check if there is any bridge with broken DAC support
+	   between the device and memory.  Declared in asm/proto.h */
+	if (mask > 0xffffffff && dma_broken_dac(dev))
+		return 0;
+
 	return 1;
 } 
 
Index: linux-work/arch/x86_64/kernel/pci-nommu.c
===================================================================
--- linux-work.orig/arch/x86_64/kernel/pci-nommu.c	2005-09-28 21:41:46.000000000 +0900
+++ linux-work/arch/x86_64/kernel/pci-nommu.c	2005-09-28 21:41:46.000000000 +0900
@@ -71,6 +71,13 @@ int dma_supported(struct device *hwdev, 
         if (mask < 0x00ffffff)
                 return 0;
 
+	/*
+	 * Check if there is any bridge with broken DAC support
+	 * between the device and memory.  Declared in asm/proto.h
+	 */
+	if (mask > 0xffffffff && dma_broken_dac(hwdev))
+		return 0;
+
 	return 1;
 } 
 EXPORT_SYMBOL(dma_supported);
Index: linux-work/include/asm-x86_64/proto.h
===================================================================
--- linux-work.orig/include/asm-x86_64/proto.h	2005-09-28 21:41:46.000000000 +0900
+++ linux-work/include/asm-x86_64/proto.h	2005-09-28 21:41:46.000000000 +0900
@@ -116,6 +116,9 @@ extern void smp_local_timer_interrupt(st
 
 long do_arch_prctl(struct task_struct *task, int code, unsigned long addr);
 
+struct device;
+extern int dma_broken_dac(struct device *dev);	/* arch/i386/kernel/quirks.c */
+
 #define round_up(x,y) (((x) + (y) - 1) & ~((y)-1))
 #define round_down(x,y) ((x) & ~((y)-1))
 

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