From 6ad95513d60096b569e4e4bd721420f03b57e4d4 Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Thu, 11 Mar 2010 12:20:06 -0700 Subject: [PATCH] ACPI: pci_root: save downstream bus range Previously, we only saved the root bus number, i.e., the beginning of the downstream bus range. We now support IORESOURCE_BUS resources, so this patch uses that to keep track of both the beginning and the end of the downstream bus range. It's important to know both the beginning and the end for supporting _CBA (see PCI Firmware spec, rev 3.0, sec 4.1.3) and so we know the limits for any possible PCI bus renumbering (we can't renumber downstream buses to be outside the bus number range claimed by the host bridge). It's clear from the spec that the bus range is supposed to be in _CRS, but if we don't find it there, we'll assume [_BBN - 0xFF] or [0 - 0xFF]. Signed-off-by: Bjorn Helgaas Reviewed-by: Kenji Kaneshige Signed-off-by: Len Brown --- drivers/acpi/pci_root.c | 67 ++++++++++++++++++++++++----------------- include/acpi/acpi_bus.h | 2 +- 2 files changed, 41 insertions(+), 28 deletions(-) diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index d724736d56c8..bf476fea97ab 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -119,7 +119,8 @@ acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus) struct acpi_pci_root *root; list_for_each_entry(root, &acpi_pci_roots, node) - if ((root->segment == (u16) seg) && (root->bus_nr == (u16) bus)) + if ((root->segment == (u16) seg) && + (root->secondary.start == (u16) bus)) return root->device->handle; return NULL; } @@ -153,7 +154,7 @@ EXPORT_SYMBOL_GPL(acpi_is_root_bridge); static acpi_status get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) { - int *busnr = data; + struct resource *res = data; struct acpi_resource_address64 address; if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 && @@ -163,28 +164,27 @@ get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) acpi_resource_to_address64(resource, &address); if ((address.address_length > 0) && - (address.resource_type == ACPI_BUS_NUMBER_RANGE)) - *busnr = address.minimum; + (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { + res->start = address.minimum; + res->end = address.minimum + address.address_length - 1; + } return AE_OK; } static acpi_status try_get_root_bridge_busnr(acpi_handle handle, - unsigned long long *bus) + struct resource *res) { acpi_status status; - int busnum; - busnum = -1; + res->start = -1; status = acpi_walk_resources(handle, METHOD_NAME__CRS, - get_root_bridge_busnr_callback, &busnum); + get_root_bridge_busnr_callback, res); if (ACPI_FAILURE(status)) return status; - /* Check if we really get a bus number from _CRS */ - if (busnum == -1) + if (res->start == -1) return AE_ERROR; - *bus = busnum; return AE_OK; } @@ -428,34 +428,47 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device) struct acpi_device *child; u32 flags, base_flags; + root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); + if (!root) + return -ENOMEM; + segment = 0; status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL, &segment); if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { printk(KERN_ERR PREFIX "can't evaluate _SEG\n"); - return -ENODEV; + result = -ENODEV; + goto end; } /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ - bus = 0; - status = try_get_root_bridge_busnr(device->handle, &bus); + root->secondary.flags = IORESOURCE_BUS; + status = try_get_root_bridge_busnr(device->handle, &root->secondary); if (ACPI_FAILURE(status)) { + /* + * We need both the start and end of the downstream bus range + * to interpret _CBA (MMCONFIG base address), so it really is + * supposed to be in _CRS. If we don't find it there, all we + * can do is assume [_BBN-0xFF] or [0-0xFF]. + */ + root->secondary.end = 0xFF; + printk(KERN_WARNING FW_BUG PREFIX + "no secondary bus range in _CRS\n"); status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, NULL, &bus); - if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { - printk(KERN_ERR PREFIX - "no bus number in _CRS and can't evaluate _BBN\n"); - return -ENODEV; + if (ACPI_SUCCESS(status)) + root->secondary.start = bus; + else if (status == AE_NOT_FOUND) + root->secondary.start = 0; + else { + printk(KERN_ERR PREFIX "can't evaluate _BBN\n"); + result = -ENODEV; + goto end; } } - root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); - if (!root) - return -ENOMEM; - INIT_LIST_HEAD(&root->node); root->device = device; root->segment = segment & 0xFFFF; - root->bus_nr = bus & 0xFF; strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); device->driver_data = root; @@ -474,9 +487,9 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device) /* TBD: Locking */ list_add_tail(&root->node, &acpi_pci_roots); - printk(KERN_INFO PREFIX "%s [%s] (%04x:%02x)\n", + printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n", acpi_device_name(device), acpi_device_bid(device), - root->segment, root->bus_nr); + root->segment, &root->secondary); /* * Scan the Root Bridge @@ -485,11 +498,11 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device) * PCI namespace does not get created until this call is made (and * thus the root bridge's pci_dev does not exist). */ - root->bus = pci_acpi_scan_root(device, segment, bus); + root->bus = pci_acpi_scan_root(device, segment, root->secondary.start); if (!root->bus) { printk(KERN_ERR PREFIX "Bus %04x:%02x not present in PCI namespace\n", - root->segment, root->bus_nr); + root->segment, (unsigned int)root->secondary.start); result = -ENODEV; goto end; } diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 7bf83ddf82e0..baacd98e7cc6 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -373,7 +373,7 @@ struct acpi_pci_root { struct acpi_pci_id id; struct pci_bus *bus; u16 segment; - u8 bus_nr; + struct resource secondary; /* downstream bus range */ u32 osc_support_set; /* _OSC state of support bits */ u32 osc_control_set; /* _OSC state of control bits */