Messages in this thread Patch in this message | | | Date | Fri, 01 Jun 2007 13:30:25 -0400 | From | Rik van Riel <> | Subject | [PATCH] quiet down swiotlb warnings |
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It turns out that the qla2xxx driver sometimes fills up the iotlb on purpose and throttles itself when pci_map_sg() fails. In the case of a driver that expects and handles pci_map_sg() failures, we should not spam the user's console with swiotlb full messages.
If the user runs a driver that cannot handle the swiotlb filling up, 5 warnings should be enough to leave a clue.
Signed-off-by: Rik van Riel <riel@redhat.com> --- linux-2.6.21.noarch/lib/swiotlb.c.quiet 2007-06-01 13:23:04.000000000 -0400 +++ linux-2.6.21.noarch/lib/swiotlb.c 2007-06-01 13:25:49.000000000 -0400 @@ -505,6 +505,7 @@ swiotlb_free_coherent(struct device *hwd static void swiotlb_full(struct device *dev, size_t size, int dir, int do_panic) { + static int warnings = 0; /* * Ran out of IOMMU space for this operation. This is very bad. * Unfortunately the drivers cannot handle this operation properly. @@ -512,8 +513,9 @@ swiotlb_full(struct device *dev, size_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 "DMA: Out of SW-IOMMU space for %zu bytes at " - "device %s\n", size, dev ? dev->bus_id : "?"); + if (++warnings < 5) + printk(KERN_ERR "DMA: Out of SW-IOMMU space for %zu bytes at " + "device %s\n", size, dev ? dev->bus_id : "?"); if (size > io_tlb_overflow && do_panic) { if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) | |