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Red Hat Bugzilla – Attachment 161206 Details for
Bug 219216
[EMC/QLogic 5.1 bug] qla2xxx driver running IO on DM-MPIO devices cause "kernel: PCI-DMA: Out of SW-IOMMU space "
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quiet down the kernel
swiotlb-xen-flood.patch (text/x-patch), 1.27 KB, created by
Rik van Riel
on 2007-08-13 19:20:58 UTC
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Description:
quiet down the kernel
Filename:
MIME Type:
Creator:
Rik van Riel
Created:
2007-08-13 19:20:58 UTC
Size:
1.27 KB
patch
obsolete
>--- linux-2.6.18.noarch/arch/i386/kernel/swiotlb.c.flood 2007-08-13 14:59:05.000000000 -0400 >+++ linux-2.6.18.noarch/arch/i386/kernel/swiotlb.c 2007-08-13 15:03:18.000000000 -0400 >@@ -397,14 +397,23 @@ static void > swiotlb_full(struct device *dev, size_t size, int dir, int do_panic) > { > /* >+ * Some drivers fill up IOMMU space on purpose. Do not flood >+ * the logs with warnings. If another driver cannot handle >+ * this and panics, the system log still has enough messages >+ * to figure out what went wrong. >+ */ >+ static int warning = 0; >+ >+ /* > * Ran out of IOMMU space for this operation. This is very bad. > * Unfortunately the drivers cannot handle this operation properly. > * unless they check for pci_dma_mapping_error (most don't) > * When the mapping is small enough return a static buffer to limit > * the damage, or panic when the transfer is too big. > */ >- printk(KERN_ERR "PCI-DMA: Out of SW-IOMMU space for %lu bytes at " >- "device %s\n", (unsigned long)size, dev ? dev->bus_id : "?"); >+ if (warning++ < 5) >+ printk(KERN_ERR "PCI-DMA: Out of SW-IOMMU space for %lu bytes at " >+ "device %s\n", (unsigned long)size, dev ? dev->bus_id : "?"); > > if (size > io_tlb_overflow && do_panic) { > if (dir == PCI_DMA_FROMDEVICE || dir == PCI_DMA_BIDIRECTIONAL)
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