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Message-ID: <20111011031835.5149.98333.stgit@bhelgaas.mtv.corp.google.com>
Date: Mon, 10 Oct 2011 21:18:35 -0600
From: Bjorn Helgaas <bhelgaas@...gle.com>
To: linux-pci@...r.kernel.org
Cc: Deng-Cheng Zhu <dczhu@...s.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 02/12] PCI: pass available resources into pci_create_bus()
The default resources given to a bus by pci_create_bus()
are ioport_resource and iomem_resource, i.e., the entire address
space. Architectures are expected to correct these later, typically
in pcibios_fixup_bus(), but code such as PCI quirks that run in the
interim see incorrect resource information.
This patch adds a "resources" argument to pci_create_bus() so
architecture code can supply the correct resources at the beginning.
Based on original patch by Deng-Cheng Zhu.
Reference: http://www.spinics.net/lists/mips/msg41654.html
Reference: https://lkml.org/lkml/2011/8/26/88
CC: Deng-Cheng Zhu <dczhu@...s.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
arch/microblaze/pci/pci-common.c | 3 ++-
arch/powerpc/kernel/pci-common.c | 3 ++-
arch/sparc/kernel/pci.c | 3 ++-
arch/x86/pci/acpi.c | 2 +-
drivers/pci/probe.c | 17 +++++++++++++----
include/linux/pci.h | 3 ++-
6 files changed, 22 insertions(+), 9 deletions(-)
diff --git a/arch/microblaze/pci/pci-common.c b/arch/microblaze/pci/pci-common.c
index 4cfae20..9c35aa6 100644
--- a/arch/microblaze/pci/pci-common.c
+++ b/arch/microblaze/pci/pci-common.c
@@ -1581,7 +1581,8 @@ static void __devinit pcibios_scan_phb(struct pci_controller *hose)
node ? node->full_name : "<NO NAME>");
/* Create an empty bus for the toplevel */
- bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose);
+ bus = pci_create_bus(hose->parent, hose->first_busno,
+ hose->ops, hose, NULL);
if (bus == NULL) {
printk(KERN_ERR "Failed to create bus for PCI domain %04x\n",
hose->global_number);
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index 32656f1..2ede26a 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -1703,7 +1703,8 @@ void __devinit pcibios_scan_phb(struct pci_controller *hose)
node ? node->full_name : "<NO NAME>");
/* Create an empty bus for the toplevel */
- bus = pci_create_bus(hose->parent, hose->first_busno, hose->ops, hose);
+ bus = pci_create_bus(hose->parent, hose->first_busno,
+ hose->ops, hose, NULL);
if (bus == NULL) {
pr_err("Failed to create bus for PCI domain %04x\n",
hose->global_number);
diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c
index 1e94f94..77c38bb 100644
--- a/arch/sparc/kernel/pci.c
+++ b/arch/sparc/kernel/pci.c
@@ -689,7 +689,8 @@ struct pci_bus * __devinit pci_scan_one_pbm(struct pci_pbm_info *pbm,
printk("PCI: Scanning PBM %s\n", node->full_name);
- bus = pci_create_bus(parent, pbm->pci_first_busno, pbm->pci_ops, pbm);
+ bus = pci_create_bus(parent, pbm->pci_first_busno,
+ pbm->pci_ops, pbm, NULL);
if (!bus) {
printk(KERN_ERR "Failed to create bus for %s\n",
node->full_name);
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 039d913..9bf7aaa 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -353,7 +353,7 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
memcpy(bus->sysdata, sd, sizeof(*sd));
kfree(sd);
} else {
- bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
+ bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd, NULL);
if (bus) {
get_current_resources(device, busnum, domain, bus);
bus->subordinate = pci_scan_child_bus(bus);
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 6ab6bd3..6a8e1c6 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1529,11 +1529,13 @@ unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
}
struct pci_bus * pci_create_bus(struct device *parent,
- int bus, struct pci_ops *ops, void *sysdata)
+ int bus, struct pci_ops *ops, void *sysdata,
+ struct list_head *resources)
{
int error;
struct pci_bus *b, *b2;
struct device *dev;
+ struct pci_bus_resource *bus_res, *n;
b = pci_alloc_bus();
if (!b)
@@ -1583,8 +1585,15 @@ struct pci_bus * pci_create_bus(struct device *parent,
pci_create_legacy_files(b);
b->number = b->secondary = bus;
- b->resource[0] = &ioport_resource;
- b->resource[1] = &iomem_resource;
+
+ /* Add initial resources to the bus */
+ if (resources) {
+ list_for_each_entry_safe(bus_res, n, resources, list)
+ list_move_tail(&bus_res->list, &b->resources);
+ } else {
+ b->resource[0] = &ioport_resource;
+ b->resource[1] = &iomem_resource;
+ }
return b;
@@ -1605,7 +1614,7 @@ struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
{
struct pci_bus *b;
- b = pci_create_bus(parent, bus, ops, sysdata);
+ b = pci_create_bus(parent, bus, ops, sysdata, NULL);
if (b)
b->subordinate = pci_scan_child_bus(b);
return b;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 6841e7f..f5e1b4a 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -667,7 +667,8 @@ static inline struct pci_bus * __devinit pci_scan_bus(int bus, struct pci_ops *o
return root_bus;
}
struct pci_bus *pci_create_bus(struct device *parent, int bus,
- struct pci_ops *ops, void *sysdata);
+ struct pci_ops *ops, void *sysdata,
+ struct list_head *resources);
struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,
int busnr);
void pcie_update_link_speed(struct pci_bus *bus, u16 link_status);
--
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