From: Muli Ben-Yehuda <[email protected]>
This works around a bug where DMAs that have the same addresses as
some MEM regions do not go through. Not clear yet if this is due to a
mis-configuration or something deeper.
Signed-off-by: Muli Ben-Yehuda <[email protected]>
---
arch/x86_64/kernel/pci-calgary.c | 67 ++++++++++++++++++++++++++++++++++++++
1 files changed, 67 insertions(+), 0 deletions(-)
diff --git a/arch/x86_64/kernel/pci-calgary.c b/arch/x86_64/kernel/pci-calgary.c
index a49b19d..9efecf3 100644
--- a/arch/x86_64/kernel/pci-calgary.c
+++ b/arch/x86_64/kernel/pci-calgary.c
@@ -1538,3 +1538,70 @@ static int __init calgary_parse_options(
return 1;
}
__setup("calgary=", calgary_parse_options);
+
+static void __init calgary_fixup_one_tce_space(struct pci_dev *dev)
+{
+ struct iommu_table *tbl;
+ unsigned int npages;
+ int i;
+
+ tbl = dev->sysdata;
+
+ for (i = 0; i < 4; i++) {
+ struct resource *r = &dev->resource[PCI_BRIDGE_RESOURCES + i];
+
+ /* Don't give out TCEs that map MEM resources */
+ if (!(r->flags & IORESOURCE_MEM))
+ continue;
+
+ /* 0-based? we reserve the whole 1st MB anyway */
+ if (!r->start)
+ continue;
+
+ /* cover the whole region */
+ npages = (r->end - r->start) >> PAGE_SHIFT;
+ npages++;
+
+ printk(KERN_DEBUG "Calg: dev %p [%x] tbl %p reserving "
+ "0x%Lx-0x%Lx [0x%x pages]\n", dev, dev->bus->number,
+ tbl, r->start, r->end, npages);
+
+ iommu_range_reserve(tbl, r->start, npages);
+ }
+}
+
+static int __init calgary_fixup_tce_spaces(void)
+{
+ struct pci_dev *dev = NULL;
+ void* tce_space;
+
+ if (no_iommu || swiotlb || !calgary_detected)
+ return -ENODEV;
+
+ printk(KERN_DEBUG "Calgary: fixing tce spaces\n");
+
+ do {
+ dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
+ if (!dev)
+ break;
+ if (!is_cal_pci_dev(dev->device))
+ continue;
+ if (!translate_phb(dev))
+ continue;
+
+ tce_space = bus_info[dev->bus->number].tce_space;
+ if (!tce_space)
+ continue;
+
+ calgary_fixup_one_tce_space(dev);
+
+ } while (1);
+
+ return 0;
+}
+
+/*
+ * We need to be call after pcibios_assign_resources (fs_initcall level)
+ * and before device_initcall.
+ */
+rootfs_initcall(calgary_fixup_tce_spaces);
--
1.4.4
-
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