[IA64] Altix pcibus_to_node implementation

The Altix subarch does not provide node information via ACPI. Instead hooks
are used to fixup pci structures. This patch determines the nodes for Altix
PCI busses.

Remote Bridges:
---------------
Altix supports remote I/O nodes without memory or processors but with bridges.
The TIOCA type of bridge is an AGP bridge and the PROM provides information
about the closest node. That information will be returned by pcibus_to_node.

The TIOCP remote bridge type is a PCI bridge but the PROM does not provide a
closest node id. pcibus_to_node will return -1 for devices on those bridges
meaning that device control structures may be allocated on any node.

Safeguard:
----------
Should the fixups result in invalid node information for a pci controller then
a warning will be printed and pcibus_to_node will return -1.


This patch also fixes the "FIXME" in sn_dma_alloc_coherent. This means that
dma_alloc_coherent will now use alloc_pages_node to allocate memory local to
the node that the PCI device is connected to.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

3 files changed, 25 insertions, 5 deletions

diff --git a/arch/ia64/sn/pci/pci_dma.c b/arch/ia64/sn/pci/pci_dma.c
index a2f7a88aefbb..0e4b9ad9ef02 100644
--- a/arch/ia64/sn/pci/pci_dma.c
+++ b/arch/ia64/sn/pci/pci_dma.c
@@ -79,6 +79,7 @@ void *sn_dma_alloc_coherent(struct device *dev, size_t size,
 {
 	void *cpuaddr;
 	unsigned long phys_addr;
+	int node;
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
 
@@ -86,10 +87,19 @@ void *sn_dma_alloc_coherent(struct device *dev, size_t size,
 
 	/*
 	 * Allocate the memory.
-	 * FIXME: We should be doing alloc_pages_node for the node closest
-	 *        to the PCI device.
 	 */
-	if (!(cpuaddr = (void *)__get_free_pages(GFP_ATOMIC, get_order(size))))
+	node = pcibus_to_node(pdev->bus);
+	if (likely(node >=0)) {
+		struct page *p = alloc_pages_node(node, GFP_ATOMIC, get_order(size));
+
+		if (likely(p))
+			cpuaddr = page_address(p);
+		else
+			return NULL;
+	} else
+		cpuaddr = (void *)__get_free_pages(GFP_ATOMIC, get_order(size));
+
+	if (unlikely(!cpuaddr))
 		return NULL;
 
 	memset(cpuaddr, 0x0, size);
diff --git a/arch/ia64/sn/pci/pcibr/pcibr_provider.c b/arch/ia64/sn/pci/pcibr/pcibr_provider.c
index 9813da56d311..b95e928636a1 100644
--- a/arch/ia64/sn/pci/pcibr/pcibr_provider.c
+++ b/arch/ia64/sn/pci/pcibr/pcibr_provider.c
@@ -85,7 +85,7 @@ pcibr_error_intr_handler(int irq, void *arg, struct pt_regs *regs)
 }
 
 void *
-pcibr_bus_fixup(struct pcibus_bussoft *prom_bussoft)
+pcibr_bus_fixup(struct pcibus_bussoft *prom_bussoft, struct pci_controller *controller)
 {
 	int nasid, cnode, j;
 	struct hubdev_info *hubdev_info;
@@ -158,6 +158,14 @@ pcibr_bus_fixup(struct pcibus_bussoft *prom_bussoft)
 	memset(soft->pbi_int_ate_resource.ate, 0,
  	       (soft->pbi_int_ate_size * sizeof(uint64_t)));
 
+	if (prom_bussoft->bs_asic_type == PCIIO_ASIC_TYPE_TIOCP)
+		/*
+		 * TIO PCI Bridge with no closest node information.
+		 * FIXME: Find another way to determine the closest node
+		 */
+		controller->node = -1;
+	else
+		controller->node = cnode;
 	return soft;
 }
 
diff --git a/arch/ia64/sn/pci/tioca_provider.c b/arch/ia64/sn/pci/tioca_provider.c
index 51cc4e63092c..5d76a7581465 100644
--- a/arch/ia64/sn/pci/tioca_provider.c
+++ b/arch/ia64/sn/pci/tioca_provider.c
@@ -581,7 +581,7 @@ tioca_error_intr_handler(int irq, void *arg, struct pt_regs *pt)
  * the caller.
  */
 static void *
-tioca_bus_fixup(struct pcibus_bussoft *prom_bussoft)
+tioca_bus_fixup(struct pcibus_bussoft *prom_bussoft, struct pci_controller *controller)
 {
 	struct tioca_common *tioca_common;
 	struct tioca_kernel *tioca_kern;
@@ -646,6 +646,8 @@ tioca_bus_fixup(struct pcibus_bussoft *prom_bussoft)
 		       __FUNCTION__, SGI_TIOCA_ERROR,
 		       (int)tioca_common->ca_common.bs_persist_busnum);
 
+	/* Setup locality information */
+	controller->node = tioca_kern->ca_closest_node;
 	return tioca_common;
 }