[RFC PATCH 1/3] PCI: Add iobusn_resource and insert root bus range to that tree.

From: Yinghai Lu
Date: Sat Jan 21 2012 - 05:25:04 EST

now only root bus number range is in that tree.

later every bus will have extra busn_res, and linked them toghter to iobusn_resource.

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
arch/ia64/pci/pci.c | 9 +++++++
arch/powerpc/kernel/pci-common.c | 12 ++++++++-
arch/x86/include/asm/topology.h | 3 +-
arch/x86/pci/acpi.c | 15 +++++++++--
arch/x86/pci/bus_numa.c | 8 +++++-
arch/x86/pci/common.c | 11 +++++---
drivers/parisc/dino.c | 9 +++++++
drivers/parisc/lba_pci.c | 8 ++++++
drivers/pci/probe.c | 49 ++++++++++++++++++++++++++++++++++---
drivers/pci/remove.c | 1 +
include/linux/ioport.h | 1 +
include/linux/pci.h | 5 ++++
kernel/resource.c | 8 ++++++
13 files changed, 125 insertions(+), 14 deletions(-)

diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index f82f5d4..20c43cc 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -331,6 +331,7 @@ pci_acpi_scan_root(struct acpi_pci_root *root)
struct acpi_device *device = root->device;
int domain = root->segment;
int bus = root->secondary.start;
+ int busmax = root->secondary.end;
struct pci_controller *controller;
unsigned int windows = 0;
struct pci_root_info info;
@@ -384,6 +385,14 @@ pci_acpi_scan_root(struct acpi_pci_root *root)
return NULL;
}

+ /* init busn_res */
+ pbus->busn_res.start = (domain << 8) | busnum;
+ pbus->busn_res.end = (domain << 8) | busmax;
+ pbus->busn_res.flags = IORESOURCE_BUS;
+
+ insert_resource(&iobusn_resource, &pbus->busn_res);
+ dev_printk(KERN_DEBUG, &pbus->dev, "busn_res: %06llx-%06llx inserted\n", (unsigned long long)pbus->busn_res.start, (unsigned long long)pbus->busn_res.end);
+
pbus->subordinate = pci_scan_child_bus(pbus);
return pbus;

diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index cce98d7..4146f11 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -1731,6 +1731,13 @@ void __devinit pcibios_scan_phb(struct pci_controller *hose)
}
bus->secondary = hose->first_busno;
hose->bus = bus;
+ /* init busn_res */
+ bus->busn_res.start = (pci_domain_nr(bus) << 8) | host->first_busno;
+ bus->busn_res.end = (pci_domain_nr(bus) << 8) | host->last_busno;
+ bus->busn_res.flags = IORESOURCE_BUS;
+
+ insert_resource(&iobusn_resource, &bus->busn_res);
+ dev_printk(KERN_DEBUG, &bus->dev, "busn_res: %06llx-%06llx inserted\n", (unsigned long long)bus->busn_res.start, (unsigned long long)bus->busn_res.end);

/* Get probe mode and perform scan */
mode = PCI_PROBE_NORMAL;
@@ -1742,8 +1749,11 @@ void __devinit pcibios_scan_phb(struct pci_controller *hose)
of_scan_bus(node, bus);
}

- if (mode == PCI_PROBE_NORMAL)
+ if (mode == PCI_PROBE_NORMAL) {
+ bus->busn_res.end = (pci_domain_nr(bus) << 8) | 255;
hose->last_busno = bus->subordinate = pci_scan_child_bus(bus);
+ bus->busn_res.end = (pci_domain_nr(bus) << 8) | bus->subordinate;
+ }

/* Platform gets a chance to do some global fixups before
* we proceed to resource allocation
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index b9676ae..ad4060e 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -172,7 +172,8 @@ static inline void arch_fix_phys_package_id(int num, u32 slot)
}

struct pci_bus;
-void x86_pci_root_bus_resources(int bus, struct list_head *resources);
+void x86_pci_root_bus_resources(int bus, int *bus_max,
+ struct list_head *resources);

#ifdef CONFIG_SMP
#define mc_capable() ((boot_cpu_data.x86_max_cores > 1) && \
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index a312e76..1929c3f 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -348,6 +348,7 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
struct acpi_device *device = root->device;
int domain = root->segment;
int busnum = root->secondary.start;
+ int busmax = root->secondary.end;
LIST_HEAD(resources);
struct pci_bus *bus;
struct pci_sysdata *sd;
@@ -405,12 +406,20 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
} else {
get_current_resources(device, busnum, domain, &resources);
if (list_empty(&resources))
- x86_pci_root_bus_resources(busnum, &resources);
+ x86_pci_root_bus_resources(busnum, &busmax, &resources);
bus = pci_create_root_bus(NULL, busnum, &pci_root_ops, sd,
&resources);
- if (bus)
+ if (bus) {
+ /* init busn_res */
+ bus->busn_res.start = (domain << 8) | busnum;
+ bus->busn_res.end = (domain << 8) | busmax;
+ bus->busn_res.flags = IORESOURCE_BUS;
+
+ insert_resource(&iobusn_resource, &bus->busn_res);
+ dev_printk(KERN_DEBUG, &bus->dev, "busn_res: %06llx-%06llx inserted\n", (unsigned long long)bus->busn_res.start, (unsigned long long)bus->busn_res.end);
+
bus->subordinate = pci_scan_child_bus(bus);
- else
+ } else
pci_free_resource_list(&resources);
}

diff --git a/arch/x86/pci/bus_numa.c b/arch/x86/pci/bus_numa.c
index fd3f655..5213cd8 100644
--- a/arch/x86/pci/bus_numa.c
+++ b/arch/x86/pci/bus_numa.c
@@ -7,7 +7,8 @@
int pci_root_num;
struct pci_root_info pci_root_info[PCI_ROOT_NR];

-void x86_pci_root_bus_resources(int bus, struct list_head *resources)
+void x86_pci_root_bus_resources(int bus, int *bus_max,
+ struct list_head *resources)
{
int i;
int j;
@@ -28,6 +29,7 @@ void x86_pci_root_bus_resources(int bus, struct list_head *resources)
bus);

info = &pci_root_info[i];
+ *bus_max = info->bus_max;
for (j = 0; j < info->res_num; j++) {
struct resource *res;
struct resource *root;
@@ -51,6 +53,10 @@ default_resources:
printk(KERN_DEBUG "PCI: root bus %02x: using default resources\n", bus);
pci_add_resource(resources, &ioport_resource);
pci_add_resource(resources, &iomem_resource);
+ if (!bus)
+ *bus_max = 0xff;
+ else if (!*bus_max)
+ *bus_max = bus;
}

void __devinit update_res(struct pci_root_info *info, resource_size_t start,
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 323481e..ce0aefc 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -433,6 +433,7 @@ struct pci_bus * __devinit pcibios_scan_root(int busnum)
LIST_HEAD(resources);
struct pci_bus *bus = NULL;
struct pci_sysdata *sd;
+ int bus_max;

while ((bus = pci_find_next_bus(bus)) != NULL) {
if (bus->number == busnum) {
@@ -454,8 +455,9 @@ struct pci_bus * __devinit pcibios_scan_root(int busnum)
sd->node = get_mp_bus_to_node(busnum);

printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
- x86_pci_root_bus_resources(busnum, &resources);
- bus = pci_scan_root_bus(NULL, busnum, &pci_root_ops, sd, &resources);
+ x86_pci_root_bus_resources(busnum, &bus_max, &resources);
+ bus = pci_scan_root_bus_max(NULL, busnum, bus_max, &pci_root_ops, sd,
+ &resources);
if (!bus) {
pci_free_resource_list(&resources);
kfree(sd);
@@ -643,6 +645,7 @@ struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops,
LIST_HEAD(resources);
struct pci_bus *bus = NULL;
struct pci_sysdata *sd;
+ int bus_max;

/*
* Allocate per-root-bus (not per bus) arch-specific data.
@@ -655,8 +658,8 @@ struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops,
return NULL;
}
sd->node = node;
- x86_pci_root_bus_resources(busno, &resources);
- bus = pci_scan_root_bus(NULL, busno, ops, sd, &resources);
+ x86_pci_root_bus_resources(busno, &bus_max, &resources);
+ bus = pci_scan_root_bus_max(NULL, busno, bus_max, ops, sd, &resources);
if (!bus) {
pci_free_resource_list(&resources);
kfree(sd);
diff --git a/drivers/parisc/dino.c b/drivers/parisc/dino.c
index 7ff10c1..8959332 100644
--- a/drivers/parisc/dino.c
+++ b/drivers/parisc/dino.c
@@ -1014,7 +1014,16 @@ static int __init dino_probe(struct parisc_device *dev)
return 0;
}

+ /* init busn_res */
+ bus->busn_res.start = (pci_domain_nr(bus) << 8) | busnum;
+ bus->busn_res.end = (pci_domain_nr(bus) << 8) | 255;
+ bus->busn_res.flags = IORESOURCE_BUS;
+
+ insert_resource(&iobusn_resource, &bus->busn_res);
+ dev_printk(KERN_DEBUG, &bus->dev, "busn_res: %06llx-%06llx inserted\n", (unsigned long long)bus->busn_res.start, (unsigned long long)bus->busn_res.end);
+
bus->subordinate = pci_scan_child_bus(bus);
+ bus->busn_res.end = (pci_domain_nr(bus) << 8) | bus->subordinate;

/* This code *depends* on scanning being single threaded
* if it isn't, this global bus number count will fail
diff --git a/drivers/parisc/lba_pci.c b/drivers/parisc/lba_pci.c
index d5f3d75..7c2b60a 100644
--- a/drivers/parisc/lba_pci.c
+++ b/drivers/parisc/lba_pci.c
@@ -1531,6 +1531,14 @@ lba_driver_probe(struct parisc_device *dev)
return 0;
}

+ /* init busn_res */
+ lba_bus->busn_res.start = (pci_domain_nr(lba_bus) << 8) | lba_dev->hba.bus_num.start;
+ lba_bus->busn_res.end = (pci_domain_nr(lba_bus) << 8) | lba_dev->hba.bus_num.end;
+ lba_bus->busn_res.flags = IORESOURCE_BUS;
+
+ insert_resource(&iobusn_resource, &lba_bus->busn_res);
+ dev_printk(KERN_DEBUG, &lba_bus->dev, "busn_res: %06llx-%06llx inserted\n", (unsigned long long)lba_bus->busn_res.start, (unsigned long long)lba_bus->busn_res.end);
+
lba_bus->subordinate = pci_scan_child_bus(lba_bus);

/* This is in lieu of calling pci_assign_unassigned_resources() */
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 7cc9e2f..3e08207 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1608,8 +1608,9 @@ err_out:
return NULL;
}

-struct pci_bus * __devinit pci_scan_root_bus(struct device *parent, int bus,
- struct pci_ops *ops, void *sysdata, struct list_head *resources)
+struct pci_bus * __devinit pci_scan_root_bus_max(struct device *parent, int bus,
+ int bus_max, struct pci_ops *ops, void *sysdata,
+ struct list_head *resources)
{
struct pci_bus *b;

@@ -1617,10 +1618,32 @@ struct pci_bus * __devinit pci_scan_root_bus(struct device *parent, int bus,
if (!b)
return NULL;

+ /* init busn_res */
+ b->busn_res.start = (pci_domain_nr(b) << 8) | bus;
+ b->busn_res.end = (pci_domain_nr(b) << 8) | bus_max;
+ b->busn_res.flags = IORESOURCE_BUS;
+
+ insert_resource(&iobusn_resource, &b->busn_res);
+
b->subordinate = pci_scan_child_bus(b);
pci_bus_add_devices(b);
return b;
}
+EXPORT_SYMBOL(pci_scan_root_bus_max);
+
+struct pci_bus * __devinit pci_scan_root_bus(struct device *parent, int bus,
+ struct pci_ops *ops, void *sysdata,
+ struct list_head *resources)
+{
+ struct pci_bus *b;
+
+ b = pci_scan_root_bus_max(parent, bus, 255, ops, sysdata, resources);
+
+ if (b)
+ b->busn_res.end = (pci_domain_nr(b) << 8) | b->subordinate;
+
+ return b;
+}
EXPORT_SYMBOL(pci_scan_root_bus);

/* Deprecated; use pci_scan_root_bus() instead */
@@ -1633,9 +1656,18 @@ struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
pci_add_resource(&resources, &ioport_resource);
pci_add_resource(&resources, &iomem_resource);
b = pci_create_root_bus(parent, bus, ops, sysdata, &resources);
- if (b)
+ if (b) {
+ /* init busn_res */
+ b->busn_res.start = (pci_domain_nr(b) << 8) | bus;
+ b->busn_res.end = (pci_domain_nr(b) << 8) | 255;
+ b->busn_res.flags = IORESOURCE_BUS;
+
+ insert_resource(&iobusn_resource, &b->busn_res);
+
b->subordinate = pci_scan_child_bus(b);
- else
+
+ b->busn_res.end = (pci_domain_nr(b) << 8) | b->subordinate;
+ } else
pci_free_resource_list(&resources);
return b;
}
@@ -1651,7 +1683,16 @@ struct pci_bus * __devinit pci_scan_bus(int bus, struct pci_ops *ops,
pci_add_resource(&resources, &iomem_resource);
b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources);
if (b) {
+ /* init busn_res */
+ b->busn_res.start = (pci_domain_nr(b) << 8) | bus;
+ b->busn_res.end = (pci_domain_nr(b) << 8) | 255;
+ b->busn_res.flags = IORESOURCE_BUS;
+
+ insert_resource(&iobusn_resource, &b->busn_res);
+
b->subordinate = pci_scan_child_bus(b);
+
+ b->busn_res.end = (pci_domain_nr(b) << 8) | b->subordinate;
pci_bus_add_devices(b);
} else {
pci_free_resource_list(&resources);
diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index 6def362..a4cbe0e 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -68,6 +68,7 @@ void pci_remove_bus(struct pci_bus *pci_bus)

down_write(&pci_bus_sem);
list_del(&pci_bus->node);
+ release_resource(&pci_bus->busn_res);
up_write(&pci_bus_sem);
if (!pci_bus->is_added)
return;
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 9d57a71..c96781c 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -142,6 +142,7 @@ struct resource_list {
/* PC/ISA/whatever - the normal PC address spaces: IO and memory */
extern struct resource ioport_resource;
extern struct resource iomem_resource;
+extern struct resource iobusn_resource;

extern struct resource *request_resource_conflict(struct resource *root, struct resource *new);
extern int request_resource(struct resource *root, struct resource *new);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index a16b1df..4598cf5 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -420,6 +420,7 @@ struct pci_bus {
struct list_head slots; /* list of slots on this bus */
struct resource *resource[PCI_BRIDGE_RESOURCE_NUM];
struct list_head resources; /* address space routed to this bus */
+ struct resource busn_res; /* track registered bus num range */

struct pci_ops *ops; /* configuration access functions */
void *sysdata; /* hook for sys-specific extension */
@@ -665,6 +666,10 @@ struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata);
struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
struct pci_ops *ops, void *sysdata,
struct list_head *resources);
+struct pci_bus * __devinit pci_scan_root_bus_max(struct device *parent, int bus,
+ int busmax, struct pci_ops *ops,
+ void *sysdata,
+ struct list_head *resources);
struct pci_bus * __devinit pci_scan_root_bus(struct device *parent, int bus,
struct pci_ops *ops, void *sysdata,
struct list_head *resources);
diff --git a/kernel/resource.c b/kernel/resource.c
index 7640b3a..53b42f0 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -38,6 +38,14 @@ struct resource iomem_resource = {
};
EXPORT_SYMBOL(iomem_resource);

+struct resource iobusn_resource = {
+ .name = "PCI busn",
+ .start = 0,
+ .end = 0xffffff,
+ .flags = IORESOURCE_BUS,
+};
+EXPORT_SYMBOL(iobusn_resource);
+
/* constraints to be met while allocating resources */
struct resource_constraint {
resource_size_t min, max, align;
--
1.7.7

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