Altix: ACPI SSDT PCI device support

Add SN platform support for running with an ACPI
capable PROM that defines PCI devices in SSDT
tables. There is a SSDT table for every occupied
slot on a root bus, containing info for every
PPB and/or device on the bus. The SSDTs will be
dynamically loaded/unloaded at hotplug enable/disable.

Platform specific information that is currently
passed via a SAL call, will now be passed via the
Vendor resource in the ACPI Device object(s) defined
in each SSDT.

Signed-off-by: John Keller <jpk@sgi.com>
Cc: Greg KH <greg@kroah.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 290 insertions, 24 deletions

diff --git a/arch/ia64/sn/kernel/io_acpi_init.c b/arch/ia64/sn/kernel/io_acpi_init.c
index cb96b4ea7df6..8c331ca6e5c9 100644
--- a/arch/ia64/sn/kernel/io_acpi_init.c
+++ b/arch/ia64/sn/kernel/io_acpi_init.c
@@ -13,6 +13,7 @@
 #include <asm/sn/sn_sal.h>
 #include "xtalk/hubdev.h"
 #include <linux/acpi.h>
+#include <acpi/acnamesp.h>
 
 
 /*
@@ -31,6 +32,12 @@ struct acpi_vendor_uuid sn_uuid = {
 		    0xa2, 0x7c, 0x08, 0x00, 0x69, 0x13, 0xea, 0x51 },
 };
 
+struct sn_pcidev_match {
+	u8 bus;
+	unsigned int devfn;
+	acpi_handle handle;
+};
+
 /*
  * Perform the early IO init in PROM.
  */
@@ -119,9 +126,11 @@ sn_get_bussoft_ptr(struct pci_bus *bus)
 	status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
 					  &sn_uuid, &buffer);
 	if (ACPI_FAILURE(status)) {
-		printk(KERN_ERR "get_acpi_pcibus_ptr: "
-		       "get_acpi_bussoft_info() failed: %d\n",
-		       status);
+		printk(KERN_ERR "%s: "
+		       "acpi_get_vendor_resource() failed (0x%x) for: ",
+		       __FUNCTION__, status);
+		acpi_ns_print_node_pathname(handle, NULL);
+		printk("\n");
 		return NULL;
 	}
 	resource = buffer.pointer;
@@ -130,8 +139,8 @@ sn_get_bussoft_ptr(struct pci_bus *bus)
 	if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
 	     sizeof(struct pcibus_bussoft *)) {
 		printk(KERN_ERR
-		       "get_acpi_bussoft_ptr: Invalid vendor data "
-		       "length %d\n", vendor->byte_length);
+		       "%s: Invalid vendor data length %d\n",
+			__FUNCTION__, vendor->byte_length);
 		kfree(buffer.pointer);
 		return NULL;
 	}
@@ -143,34 +152,254 @@ sn_get_bussoft_ptr(struct pci_bus *bus)
 }
 
 /*
- * sn_acpi_bus_fixup
+ * sn_extract_device_info - Extract the pcidev_info and the sn_irq_info
+ *			    pointers from the vendor resource using the
+ *			    provided acpi handle, and copy the structures
+ *			    into the argument buffers.
  */
-void
-sn_acpi_bus_fixup(struct pci_bus *bus)
+static int
+sn_extract_device_info(acpi_handle handle, struct pcidev_info **pcidev_info,
+		    struct sn_irq_info **sn_irq_info)
 {
-	struct pci_dev *pci_dev = NULL;
-	struct pcibus_bussoft *prom_bussoft_ptr;
-	extern void sn_common_bus_fixup(struct pci_bus *,
-					struct pcibus_bussoft *);
+	u64 addr;
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	struct sn_irq_info *irq_info, *irq_info_prom;
+	struct pcidev_info *pcidev_ptr, *pcidev_prom_ptr;
+	struct acpi_resource *resource;
+	int ret = 0;
+	acpi_status status;
+	struct acpi_resource_vendor_typed *vendor;
 
-	if (!bus->parent) {	/* If root bus */
-		prom_bussoft_ptr = sn_get_bussoft_ptr(bus);
-		if (prom_bussoft_ptr == NULL) {
+	/*
+	 * The pointer to this device's pcidev_info structure in
+	 * the PROM, is in the vendor resource.
+	 */
+	status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
+					  &sn_uuid, &buffer);
+	if (ACPI_FAILURE(status)) {
+		printk(KERN_ERR
+		       "%s: acpi_get_vendor_resource() failed (0x%x) for: ",
+		        __FUNCTION__, status);
+		acpi_ns_print_node_pathname(handle, NULL);
+		printk("\n");
+		return 1;
+	}
+
+	resource = buffer.pointer;
+	vendor = &resource->data.vendor_typed;
+	if ((vendor->byte_length - sizeof(struct acpi_vendor_uuid)) !=
+	    sizeof(struct pci_devdev_info *)) {
+		printk(KERN_ERR
+		       "%s: Invalid vendor data length: %d for: ",
+		        __FUNCTION__, vendor->byte_length);
+		acpi_ns_print_node_pathname(handle, NULL);
+		printk("\n");
+		ret = 1;
+		goto exit;
+	}
+
+	pcidev_ptr = kzalloc(sizeof(struct pcidev_info), GFP_KERNEL);
+	if (!pcidev_ptr)
+		panic("%s: Unable to alloc memory for pcidev_info", __FUNCTION__);
+
+	memcpy(&addr, vendor->byte_data, sizeof(struct pcidev_info *));
+	pcidev_prom_ptr = __va(addr);
+	memcpy(pcidev_ptr, pcidev_prom_ptr, sizeof(struct pcidev_info));
+
+	/* Get the IRQ info */
+	irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
+	if (!irq_info)
+		 panic("%s: Unable to alloc memory for sn_irq_info", __FUNCTION__);
+
+	if (pcidev_ptr->pdi_sn_irq_info) {
+		irq_info_prom = __va(pcidev_ptr->pdi_sn_irq_info);
+		memcpy(irq_info, irq_info_prom, sizeof(struct sn_irq_info));
+	}
+
+	*pcidev_info = pcidev_ptr;
+	*sn_irq_info = irq_info;
+
+exit:
+	kfree(buffer.pointer);
+	return ret;
+}
+
+static unsigned int
+get_host_devfn(acpi_handle device_handle, acpi_handle rootbus_handle)
+{
+	unsigned long adr;
+	acpi_handle child;
+	unsigned int devfn;
+	int function;
+	acpi_handle parent;
+	int slot;
+	acpi_status status;
+
+	/*
+	 * Do an upward search to find the root bus device, and
+	 * obtain the host devfn from the previous child device.
+	 */
+	child = device_handle;
+	while (child) {
+		status = acpi_get_parent(child, &parent);
+		if (ACPI_FAILURE(status)) {
+			printk(KERN_ERR "%s: acpi_get_parent() failed "
+			       "(0x%x) for: ", __FUNCTION__, status);
+			acpi_ns_print_node_pathname(child, NULL);
+			printk("\n");
+			panic("%s: Unable to find host devfn\n", __FUNCTION__);
+		}
+		if (parent == rootbus_handle)
+			break;
+		child = parent;
+	}
+	if (!child) {
+		printk(KERN_ERR "%s: Unable to find root bus for: ",
+		       __FUNCTION__);
+		acpi_ns_print_node_pathname(device_handle, NULL);
+		printk("\n");
+		BUG();
+	}
+
+	status = acpi_evaluate_integer(child, METHOD_NAME__ADR, NULL, &adr);
+	if (ACPI_FAILURE(status)) {
+		printk(KERN_ERR "%s: Unable to get _ADR (0x%x) for: ",
+		       __FUNCTION__, status);
+		acpi_ns_print_node_pathname(child, NULL);
+		printk("\n");
+		panic("%s: Unable to find host devfn\n", __FUNCTION__);
+	}
+
+	slot = (adr >> 16) & 0xffff;
+	function = adr & 0xffff;
+	devfn = PCI_DEVFN(slot, function);
+	return devfn;
+}
+
+/*
+ * find_matching_device - Callback routine to find the ACPI device
+ *			  that matches up with our pci_dev device.
+ *			  Matching is done on bus number and devfn.
+ *			  To find the bus number for a particular
+ *			  ACPI device, we must look at the _BBN method
+ *			  of its parent.
+ */
+static acpi_status
+find_matching_device(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+	unsigned long bbn = -1;
+	unsigned long adr;
+	acpi_handle parent = NULL;
+	acpi_status status;
+	unsigned int devfn;
+	int function;
+	int slot;
+	struct sn_pcidev_match *info = context;
+
+        status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
+                                       &adr);
+        if (ACPI_SUCCESS(status)) {
+		status = acpi_get_parent(handle, &parent);
+		if (ACPI_FAILURE(status)) {
 			printk(KERN_ERR
-			       "sn_pci_fixup_bus: 0x%04x:0x%02x Unable to "
-			       "obtain prom_bussoft_ptr\n",
-			       pci_domain_nr(bus), bus->number);
-			return;
+			       "%s: acpi_get_parent() failed (0x%x) for: ",
+					__FUNCTION__, status);
+			acpi_ns_print_node_pathname(handle, NULL);
+			printk("\n");
+			return AE_OK;
+		}
+		status = acpi_evaluate_integer(parent, METHOD_NAME__BBN,
+					       NULL, &bbn);
+		if (ACPI_FAILURE(status)) {
+			printk(KERN_ERR
+			  "%s: Failed to find _BBN in parent of: ",
+					__FUNCTION__);
+			acpi_ns_print_node_pathname(handle, NULL);
+			printk("\n");
+			return AE_OK;
+		}
+
+                slot = (adr >> 16) & 0xffff;
+                function = adr & 0xffff;
+                devfn = PCI_DEVFN(slot, function);
+                if ((info->devfn == devfn) && (info->bus == bbn)) {
+			/* We have a match! */
+			info->handle = handle;
+			return 1;
 		}
-		sn_common_bus_fixup(bus, prom_bussoft_ptr);
 	}
-	list_for_each_entry(pci_dev, &bus->devices, bus_list) {
-		sn_pci_fixup_slot(pci_dev);
+	return AE_OK;
+}
+
+/*
+ * sn_acpi_get_pcidev_info - Search ACPI namespace for the acpi
+ *			     device matching the specified pci_dev,
+ *			     and return the pcidev info and irq info.
+ */
+int
+sn_acpi_get_pcidev_info(struct pci_dev *dev, struct pcidev_info **pcidev_info,
+			struct sn_irq_info **sn_irq_info)
+{
+	unsigned int host_devfn;
+	struct sn_pcidev_match pcidev_match;
+	acpi_handle rootbus_handle;
+	unsigned long segment;
+	acpi_status status;
+
+	rootbus_handle = PCI_CONTROLLER(dev)->acpi_handle;
+        status = acpi_evaluate_integer(rootbus_handle, METHOD_NAME__SEG, NULL,
+                                       &segment);
+        if (ACPI_SUCCESS(status)) {
+		if (segment != pci_domain_nr(dev)) {
+			printk(KERN_ERR
+			       "%s: Segment number mismatch, 0x%lx vs 0x%x for: ",
+			       __FUNCTION__, segment, pci_domain_nr(dev));
+			acpi_ns_print_node_pathname(rootbus_handle, NULL);
+			printk("\n");
+			return 1;
+		}
+	} else {
+		printk(KERN_ERR "%s: Unable to get __SEG from: ",
+		       __FUNCTION__);
+		acpi_ns_print_node_pathname(rootbus_handle, NULL);
+		printk("\n");
+		return 1;
+	}
+
+	/*
+	 * We want to search all devices in this segment/domain
+	 * of the ACPI namespace for the matching ACPI device,
+	 * which holds the pcidev_info pointer in its vendor resource.
+	 */
+	pcidev_match.bus = dev->bus->number;
+	pcidev_match.devfn = dev->devfn;
+	pcidev_match.handle = NULL;
+
+	acpi_walk_namespace(ACPI_TYPE_DEVICE, rootbus_handle, ACPI_UINT32_MAX,
+			    find_matching_device, &pcidev_match, NULL);
+
+	if (!pcidev_match.handle) {
+		printk(KERN_ERR
+		       "%s: Could not find matching ACPI device for %s.\n",
+		       __FUNCTION__, pci_name(dev));
+		return 1;
 	}
+
+	if (sn_extract_device_info(pcidev_match.handle, pcidev_info, sn_irq_info))
+		return 1;
+
+	/* Build up the pcidev_info.pdi_slot_host_handle */
+	host_devfn = get_host_devfn(pcidev_match.handle, rootbus_handle);
+	(*pcidev_info)->pdi_slot_host_handle =
+			((unsigned long) pci_domain_nr(dev) << 40) |
+					/* bus == 0 */
+					host_devfn;
+	return 0;
 }
 
 /*
- * sn_acpi_slot_fixup - Perform any SN specific slot fixup.
+ * sn_acpi_slot_fixup - Obtain the pcidev_info and sn_irq_info.
+ *			Perform any SN specific slot fixup.
  *			At present there does not appear to be
  *			any generic way to handle a ROM image
  *			that has been shadowed by the PROM, so
@@ -179,11 +408,18 @@ sn_acpi_bus_fixup(struct pci_bus *bus)
  */
 
 void
-sn_acpi_slot_fixup(struct pci_dev *dev, struct pcidev_info *pcidev_info)
+sn_acpi_slot_fixup(struct pci_dev *dev)
 {
 	void __iomem *addr;
+	struct pcidev_info *pcidev_info = NULL;
+	struct sn_irq_info *sn_irq_info = NULL;
 	size_t size;
 
+	if (sn_acpi_get_pcidev_info(dev, &pcidev_info, &sn_irq_info)) {
+		panic("%s:  Failure obtaining pcidev_info for %s\n",
+		      __FUNCTION__, pci_name(dev));
+	}
+
 	if (pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE]) {
 		/*
 		 * A valid ROM image exists and has been shadowed by the
@@ -200,8 +436,11 @@ sn_acpi_slot_fixup(struct pci_dev *dev, struct pcidev_info *pcidev_info)
 						(unsigned long) addr + size;
 		dev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_BIOS_COPY;
 	}
+	sn_pci_fixup_slot(dev, pcidev_info, sn_irq_info);
 }
 
+EXPORT_SYMBOL(sn_acpi_slot_fixup);
+
 static struct acpi_driver acpi_sn_hubdev_driver = {
 	.name = "SGI HUBDEV Driver",
 	.ids = "SGIHUB,SGITIO",
@@ -212,6 +451,33 @@ static struct acpi_driver acpi_sn_hubdev_driver = {
 
 
 /*
+ * sn_acpi_bus_fixup -  Perform SN specific setup of software structs
+ *			(pcibus_bussoft, pcidev_info) and hardware
+ *			registers, for the specified bus and devices under it.
+ */
+void
+sn_acpi_bus_fixup(struct pci_bus *bus)
+{
+	struct pci_dev *pci_dev = NULL;
+	struct pcibus_bussoft *prom_bussoft_ptr;
+
+	if (!bus->parent) {	/* If root bus */
+		prom_bussoft_ptr = sn_get_bussoft_ptr(bus);
+		if (prom_bussoft_ptr == NULL) {
+			printk(KERN_ERR
+			       "%s: 0x%04x:0x%02x Unable to "
+			       "obtain prom_bussoft_ptr\n",
+			       __FUNCTION__, pci_domain_nr(bus), bus->number);
+			return;
+		}
+		sn_common_bus_fixup(bus, prom_bussoft_ptr);
+	}
+	list_for_each_entry(pci_dev, &bus->devices, bus_list) {
+		sn_acpi_slot_fixup(pci_dev);
+	}
+}
+
+/*
  * sn_io_acpi_init - PROM has ACPI support for IO, defining at a minimum the
  *		     nodes and root buses in the DSDT. As a result, bus scanning
  *		     will be initiated by the Linux ACPI code.