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authorGlauber Costa <gcosta@redhat.com>2008-04-09 13:18:08 -0300
committerIngo Molnar <mingo@elte.hu>2008-04-19 19:19:58 +0200
commitda60cab4dd922cd933e82bace490f6155a32a90e (patch)
tree19d1df02cbe4cf370f383fcc466298a699fe757e /arch
parentaa99b16faadcc9a5b6bd9550fda117a8e9e46d26 (diff)
x86: return conditional to mmu
Just return our allocation if we don't have an mmu. For i386, where this patch is being applied, we never have. So our goal is just to have the code to look like x86_64's. Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/pci-dma_32.c34
1 files changed, 32 insertions, 2 deletions
diff --git a/arch/x86/kernel/pci-dma_32.c b/arch/x86/kernel/pci-dma_32.c
index 5450bd142cb..f134de3833a 100644
--- a/arch/x86/kernel/pci-dma_32.c
+++ b/arch/x86/kernel/pci-dma_32.c
@@ -116,12 +116,42 @@ again:
gfp = (gfp & ~GFP_DMA32) | GFP_DMA;
goto again;
}
+
+ /* Let low level make its own zone decisions */
+ gfp &= ~(GFP_DMA32|GFP_DMA);
+
+ if (dma_ops->alloc_coherent)
+ return dma_ops->alloc_coherent(dev, size,
+ dma_handle, gfp);
+ return NULL;
+
}
memset(ret, 0, size);
- *dma_handle = bus;
+ if (!mmu) {
+ *dma_handle = bus;
+ return ret;
+ }
+ }
+
+ if (dma_ops->alloc_coherent) {
+ free_pages((unsigned long)ret, get_order(size));
+ gfp &= ~(GFP_DMA|GFP_DMA32);
+ return dma_ops->alloc_coherent(dev, size, dma_handle, gfp);
+ }
+
+ if (dma_ops->map_simple) {
+ *dma_handle = dma_ops->map_simple(dev, virt_to_phys(ret),
+ size,
+ PCI_DMA_BIDIRECTIONAL);
+ if (*dma_handle != bad_dma_address)
+ return ret;
}
- return ret;
+ if (panic_on_overflow)
+ panic("dma_alloc_coherent: IOMMU overflow by %lu bytes\n",
+ (unsigned long)size);
+ free_pages((unsigned long)ret, get_order(size));
+ return NULL;
}
EXPORT_SYMBOL(dma_alloc_coherent);