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authorStephen Rothwell <sfr@canb.auug.org.au>2007-12-21 15:50:09 +1100
committerPaul Mackerras <paulus@samba.org>2008-01-17 14:57:05 +1100
commit885b86e4e7ccc360f8ce4d7fb10dfdfb6e3c8650 (patch)
tree306b7438cdce8479397ee1ae8c9f244a07f9d9f7 /arch/powerpc/platforms/iseries/pci.c
parentb6ed42a794e1ca51fb46ff2bdc562315c46dd9a8 (diff)
[POWERPC] iSeries: eliminate pci_dn bussubno
xlate_iomm_address() really wants the ds_addr to pass to the HV, so store that value (instead of the BAR number) when we allocate the device bars. This is not a fast path, so we can look up the device_node property there instead of using the bussubno field of the pci_dn. The other user of iseries_ds_addr() was already scanning the device tree, so looking up a property will not slow it down any more. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/platforms/iseries/pci.c')
-rw-r--r--arch/powerpc/platforms/iseries/pci.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/powerpc/platforms/iseries/pci.c b/arch/powerpc/platforms/iseries/pci.c
index 931941036b9..cc562e4c2f3 100644
--- a/arch/powerpc/platforms/iseries/pci.c
+++ b/arch/powerpc/platforms/iseries/pci.c
@@ -29,6 +29,7 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/pci.h>
+#include <linux/of.h>
#include <asm/types.h>
#include <asm/io.h>
@@ -70,7 +71,7 @@ static long current_iomm_table_entry;
* Lookup Tables.
*/
static struct device_node *iomm_table[IOMM_TABLE_MAX_ENTRIES];
-static u8 iobar_table[IOMM_TABLE_MAX_ENTRIES];
+static u64 ds_addr_table[IOMM_TABLE_MAX_ENTRIES];
static DEFINE_SPINLOCK(iomm_table_lock);
@@ -80,8 +81,9 @@ static DEFINE_SPINLOCK(iomm_table_lock);
static inline u64 iseries_ds_addr(struct device_node *node)
{
struct pci_dn *pdn = PCI_DN(node);
+ const u32 *sbp = of_get_property(node, "linux,subbus", NULL);
- return ((u64)pdn->busno << 48) + ((u64)pdn->bussubno << 40)
+ return ((u64)pdn->busno << 48) + ((u64)(sbp ? *sbp : 0) << 40)
+ ((u64)0x10 << 32);
}
@@ -333,7 +335,8 @@ static void __init iomm_table_allocate_entry(struct pci_dev *dev, int bar_num)
*/
while (bar_size > 0 ) {
iomm_table[current_iomm_table_entry] = dev->sysdata;
- iobar_table[current_iomm_table_entry] = bar_num;
+ ds_addr_table[current_iomm_table_entry] =
+ iseries_ds_addr(dev->sysdata) | (bar_num << 24);
bar_size -= IOMM_TABLE_ENTRY_SIZE;
++current_iomm_table_entry;
}
@@ -598,8 +601,7 @@ static inline struct device_node *xlate_iomm_address(
dn = iomm_table[ind];
if (dn != NULL) {
- int barnum = iobar_table[ind];
- *dsaptr = iseries_ds_addr(dn) | (barnum << 24);
+ *dsaptr = ds_addr_table[ind];
*bar_offset = base_addr % IOMM_TABLE_ENTRY_SIZE;
} else
panic("PCI: Invalid PCI IO address detected!\n");