x86: Calgary: fix disable busnum for CalIOC2

The old check we used based on dev->bus->number is wrong for devices on
CalIOC2.  Instead look whether we have an IOMMU table for that bus - if
not, translation is disabled.

Thanks to Murillo Fernandes Bernardes <bernarde@br.ibm.com> for
spotting, suggesting a fix and testing.

Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com>
Acked-by: Murillo Fernandes Bernardes <bernarde@br.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 11 insertions, 5 deletions

diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index a50b787b3bfa..ef05cc32a3a9 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -222,6 +222,12 @@ static inline unsigned int num_dma_pages(unsigned long dma, unsigned int dmalen)
         return npages;
 }
 
+static inline int translation_enabled(struct iommu_table *tbl)
+{
+        /* only PHBs with translation enabled have an IOMMU table */
+        return (tbl != NULL);
+}
+
 static inline int translate_phb(struct pci_dev* dev)
 {
         int disabled = bus_info[dev->bus->number].translation_disabled;
@@ -388,7 +394,7 @@ static void calgary_unmap_sg(struct device *dev,
         struct scatterlist *s;
         int i;
 
-        if (!translate_phb(to_pci_dev(dev)))
+        if (!translate_enabled(tbl))
                 return;
 
         for_each_sg(sglist, s, nelems, i) {
@@ -428,7 +434,7 @@ static int calgary_map_sg(struct device *dev, struct scatterlist *sg,
         unsigned long entry;
         int i;
 
-        if (!translate_phb(to_pci_dev(dev)))
+        if (!translation_enabled(tbl))
                 return calgary_nontranslate_map_sg(dev, sg, nelems, direction);
 
         for_each_sg(sg, s, nelems, i) {
@@ -474,7 +480,7 @@ static dma_addr_t calgary_map_single(struct device *dev, void *vaddr,
         uaddr = (unsigned long)vaddr;
         npages = num_dma_pages(uaddr, size);
 
-        if (translate_phb(to_pci_dev(dev)))
+        if (translation_enabled(tbl))
                 dma_handle = iommu_alloc(tbl, vaddr, npages, direction);
         else
                 dma_handle = virt_to_bus(vaddr);
@@ -488,7 +494,7 @@ static void calgary_unmap_single(struct device *dev, dma_addr_t dma_handle,
         struct iommu_table *tbl = find_iommu_table(dev);
         unsigned int npages;
 
-        if (!translate_phb(to_pci_dev(dev)))
+        if (!translation_enabled(tbl))
                 return;
 
         npages = num_dma_pages(dma_handle, size);
@@ -513,7 +519,7 @@ static void* calgary_alloc_coherent(struct device *dev, size_t size,
                 goto error;
         memset(ret, 0, size);
 
-        if (translate_phb(to_pci_dev(dev))) {
+        if (translation_enabled(tbl)) {
                 /* set up tces to cover the allocated range */
                 mapping = iommu_alloc(tbl, ret, npages, DMA_BIDIRECTIONAL);
                 if (mapping == bad_dma_address)