x86-64: introduce struct pci_sysdata to facilitate sharing of ->sysdata

This patch introduces struct pci_sysdata to x86 and x86-64, and
converts the existing two users (NUMA, Calgary) to use it.

This lays the groundwork for having other users of sysdata, such as
the PCI domains work.

The Calgary bits are tested, the NUMA bits just look ok.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 19 insertions, 22 deletions

diff --git a/arch/x86_64/kernel/pci-calgary.c b/arch/x86_64/kernel/pci-calgary.c
index 21ded20a3bf4..ba16c968ca3f 100644
--- a/arch/x86_64/kernel/pci-calgary.c
+++ b/arch/x86_64/kernel/pci-calgary.c
@@ -373,7 +373,7 @@ static inline struct iommu_table *find_iommu_table(struct device *dev)
         else
                 pbus = pdev->bus;
 
-        tbl = pbus->self->sysdata;
+        tbl = pci_iommu(pbus);
 
         BUG_ON(pdev->bus->parent &&
                (tbl->it_busno != pdev->bus->parent->number));
@@ -716,7 +716,7 @@ static void __init calgary_reserve_mem_region(struct pci_dev *dev, u64 start,
         limit++;
 
         numpages = ((limit - start) >> PAGE_SHIFT);
-        iommu_range_reserve(dev->sysdata, start, numpages);
+        iommu_range_reserve(pci_iommu(dev->bus), start, numpages);
 }
 
 static void __init calgary_reserve_peripheral_mem_1(struct pci_dev *dev)
@@ -724,7 +724,7 @@ static void __init calgary_reserve_peripheral_mem_1(struct pci_dev *dev)
         void __iomem *target;
         u64 low, high, sizelow;
         u64 start, limit;
-        struct iommu_table *tbl = dev->sysdata;
+        struct iommu_table *tbl = pci_iommu(dev->bus);
         unsigned char busnum = dev->bus->number;
         void __iomem *bbar = tbl->bbar;
 
@@ -748,7 +748,7 @@ static void __init calgary_reserve_peripheral_mem_2(struct pci_dev *dev)
         u32 val32;
         u64 low, high, sizelow, sizehigh;
         u64 start, limit;
-        struct iommu_table *tbl = dev->sysdata;
+        struct iommu_table *tbl = pci_iommu(dev->bus);
         unsigned char busnum = dev->bus->number;
         void __iomem *bbar = tbl->bbar;
 
@@ -784,7 +784,7 @@ static void __init calgary_reserve_regions(struct pci_dev *dev)
 {
         unsigned int npages;
         u64 start;
-        struct iommu_table *tbl = dev->sysdata;
+        struct iommu_table *tbl = pci_iommu(dev->bus);
 
         /* reserve EMERGENCY_PAGES from bad_dma_address and up */
         iommu_range_reserve(tbl, bad_dma_address, EMERGENCY_PAGES);
@@ -818,7 +818,7 @@ static int __init calgary_setup_tar(struct pci_dev *dev, void __iomem *bbar)
         if (ret)
                 return ret;
 
-        tbl = dev->sysdata;
+        tbl = pci_iommu(dev->bus);
         tbl->it_base = (unsigned long)bus_info[dev->bus->number].tce_space;
         tce_free(tbl, 0, tbl->it_size);
 
@@ -855,7 +855,7 @@ static int __init calgary_setup_tar(struct pci_dev *dev, void __iomem *bbar)
 static void __init calgary_free_bus(struct pci_dev *dev)
 {
         u64 val64;
-        struct iommu_table *tbl = dev->sysdata;
+        struct iommu_table *tbl = pci_iommu(dev->bus);
         void __iomem *target;
         unsigned int bitmapsz;
 
@@ -870,7 +870,8 @@ static void __init calgary_free_bus(struct pci_dev *dev)
         tbl->it_map = NULL;
 
         kfree(tbl);
-        dev->sysdata = NULL;
+        
+        set_pci_iommu(dev->bus, NULL);
 
         /* Can't free bootmem allocated memory after system is up :-( */
         bus_info[dev->bus->number].tce_space = NULL;
@@ -943,7 +944,7 @@ static void calioc2_dump_error_regs(struct iommu_table *tbl)
 static void calgary_watchdog(unsigned long data)
 {
         struct pci_dev *dev = (struct pci_dev *)data;
-        struct iommu_table *tbl = dev->sysdata;
+        struct iommu_table *tbl = pci_iommu(dev->bus);
         void __iomem *bbar = tbl->bbar;
         u32 val32;
         void __iomem *target;
@@ -1041,7 +1042,7 @@ static void __init calgary_enable_translation(struct pci_dev *dev)
         struct iommu_table *tbl;
 
         busnum = dev->bus->number;
-        tbl = dev->sysdata;
+        tbl = pci_iommu(dev->bus);
         bbar = tbl->bbar;
 
         /* enable TCE in PHB Config Register */
@@ -1073,7 +1074,7 @@ static void __init calgary_disable_translation(struct pci_dev *dev)
         struct iommu_table *tbl;
 
         busnum = dev->bus->number;
-        tbl = dev->sysdata;
+        tbl = pci_iommu(dev->bus);
         bbar = tbl->bbar;
 
         /* disable TCE in PHB Config Register */
@@ -1091,7 +1092,7 @@ static void __init calgary_disable_translation(struct pci_dev *dev)
 static void __init calgary_init_one_nontraslated(struct pci_dev *dev)
 {
         pci_dev_get(dev);
-        dev->sysdata = NULL;
+        set_pci_iommu(dev->bus, NULL);
 
         /* is the device behind a bridge? */
         if (dev->bus->parent)
@@ -1123,7 +1124,7 @@ static int __init calgary_init_one(struct pci_dev *dev)
         } else
                 dev->bus->self = dev;
 
-        tbl = dev->sysdata;
+        tbl = pci_iommu(dev->bus);
         tbl->chip_ops->handle_quirks(tbl, dev);
 
         calgary_enable_translation(dev);
@@ -1520,7 +1521,7 @@ static void __init calgary_fixup_one_tce_space(struct pci_dev *dev)
         unsigned int npages;
         int i;
 
-        tbl = dev->sysdata;
+        tbl = pci_iommu(dev->bus);
 
         for (i = 0; i < 4; i++) {
                 struct resource *r = &dev->resource[PCI_BRIDGE_RESOURCES + i];
diff --git a/arch/x86_64/kernel/tce.c b/arch/x86_64/kernel/tce.c
index f61fb8e4f129..3aeae2fa2e24 100644
--- a/arch/x86_64/kernel/tce.c
+++ b/arch/x86_64/kernel/tce.c
@@ -136,9 +136,9 @@ int build_tce_table(struct pci_dev *dev, void __iomem *bbar)
         struct iommu_table *tbl;
         int ret;
 
-        if (dev->sysdata) {
-                printk(KERN_ERR "Calgary: dev %p has sysdata %p\n",
-                       dev, dev->sysdata);
+        if (pci_iommu(dev->bus)) {
+                printk(KERN_ERR "Calgary: dev %p has sysdata->iommu %p\n",
+                       dev, pci_iommu(dev->bus));
                 BUG();
         }
 
@@ -155,11 +155,7 @@ int build_tce_table(struct pci_dev *dev, void __iomem *bbar)
 
         tbl->bbar = bbar;
 
-        /*
-         * NUMA is already using the bus's sysdata pointer, so we use
-         * the bus's pci_dev's sysdata instead.
-         */
-        dev->sysdata = tbl;
+        set_pci_iommu(dev->bus, tbl);
 
         return 0;