| Message ID | 1425868467-9667-10-git-send-email-wangyijing@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Mar 09, 2015 at 10:34:06AM +0800, Yijing Wang wrote: > This patch separate pci_host_bridge creation out > of pci_create_root_bus(), and try to make a generic > pci_host_bridge, then we could place generic PCI > infos like domain number in it. Also Ripping out > pci_host_bridge creation from pci_create_root_bus() > make code more better readability. Further more, > we could use the generic pci_host_bridge to hold > host bridge specific operations like > pcibios_root_bridge_prepare(). The changes are > transparent to platform host bridge drivers. > > Signed-off-by: Yijing Wang <wangyijing@huawei.com> > Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> > --- > drivers/pci/host-bridge.c | 55 ++++++++++++++++++++++ > drivers/pci/pci.h | 3 + > drivers/pci/probe.c | 114 ++++++++++++++++++++------------------------- > include/linux/pci.h | 1 + > 4 files changed, 109 insertions(+), 64 deletions(-) > > diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c > index 39b2dbe..3bd45e7 100644 > --- a/drivers/pci/host-bridge.c > +++ b/drivers/pci/host-bridge.c > @@ -8,6 +8,61 @@ > > #include "pci.h" > > +static void pci_release_host_bridge_dev(struct device *dev) > +{ > + struct pci_host_bridge *bridge = to_pci_host_bridge(dev); > + > + if (bridge->release_fn) > + bridge->release_fn(bridge); > + > + pci_free_resource_list(&bridge->windows); > + kfree(bridge); > +} > + > +struct pci_host_bridge *pci_create_host_bridge( > + struct device *parent, u32 db, struct list_head *resources) > +{ > + int error; > + int bus = PCI_BUSNUM(db); > + int domain = PCI_DOMAIN(db); > + struct pci_host_bridge *host; > + struct resource_entry *window, *n; > + > + host = kzalloc(sizeof(*host), GFP_KERNEL); > + if (!host) > + return NULL; > + > + host->busnum = bus; > + host->domain = domain; > + /* If support CONFIG_PCI_DOMAINS_GENERIC, use > + * pci_host_assign_domain_nr() to assign domain > + * number instead PCI_DOMAIN(db). > + */ Follow the normal Linux comment style: host->domain = domain; /* * If we support ... */ > + pci_host_assign_domain_nr(host); > + > + host->dev.parent = parent; > + INIT_LIST_HEAD(&host->windows); > + host->dev.release = pci_release_host_bridge_dev; > + dev_set_name(&host->dev, "pci%04x:%02x", host->domain, > + host->busnum); > + > + error = device_register(&host->dev); > + if (error) { > + put_device(&host->dev); > + return NULL; > + } > + > + resource_list_for_each_entry_safe(window, n, resources) > + list_move_tail(&window->node, &host->windows); > + > + return host; > +} > + > +void pci_free_host_bridge(struct pci_host_bridge *host) > +{ > + device_unregister(&host->dev); > +} > + > static struct pci_bus *find_pci_root_bus(struct pci_bus *bus) > { > while (bus->parent) > diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > index eeacab9..3de5e51 100644 > --- a/drivers/pci/pci.h > +++ b/drivers/pci/pci.h > @@ -323,4 +323,7 @@ static inline int pci_dev_specific_reset(struct pci_dev *dev, int probe) > } > #endif > > +struct pci_host_bridge *pci_create_host_bridge( > + struct device *parent, u32 dombus, struct list_head *resources); > +void pci_free_host_bridge(struct pci_host_bridge *host); A later patch adds another declaration and a blank line here. If you want the blank line, add it here, when you're adding the first declarations in this section. > #endif /* DRIVERS_PCI_H */ > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c > index 3d6befd..27ec612 100644 > --- a/drivers/pci/probe.c > +++ b/drivers/pci/probe.c > @@ -503,31 +503,6 @@ static struct pci_bus *pci_alloc_bus(struct pci_bus *parent) > return b; > } > > -static void pci_release_host_bridge_dev(struct device *dev) > -{ > - struct pci_host_bridge *bridge = to_pci_host_bridge(dev); > - > - if (bridge->release_fn) > - bridge->release_fn(bridge); > - > - pci_free_resource_list(&bridge->windows); > - > - kfree(bridge); > -} > - > -static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b) > -{ > - struct pci_host_bridge *bridge; > - > - bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); > - if (!bridge) > - return NULL; > - > - INIT_LIST_HEAD(&bridge->windows); > - bridge->bus = b; > - return bridge; > -} > - > static const unsigned char pcix_bus_speed[] = { > PCI_SPEED_UNKNOWN, /* 0 */ > PCI_SPEED_66MHz_PCIX, /* 1 */ > @@ -1890,54 +1865,41 @@ void __weak pcibios_remove_bus(struct pci_bus *bus) > { > } > > -struct pci_bus *pci_create_root_bus(struct device *parent, u32 db, > - struct pci_ops *ops, void *sysdata, struct list_head *resources) > +static struct pci_bus *__pci_create_root_bus( > + struct pci_host_bridge *bridge, struct pci_ops *ops, > + void *sysdata) > { > int error; > - struct pci_host_bridge *bridge; > struct pci_bus *b, *b2; > - struct resource_entry *window, *n; > + struct resource_entry *window; > + struct device *parent; > struct resource *res; > resource_size_t offset; > char bus_addr[64]; > char *fmt; > - u8 bus = PCI_BUSNUM(db); > > + parent = bridge->dev.parent; > b = pci_alloc_bus(NULL); > if (!b) > return NULL; > > b->sysdata = sysdata; > b->ops = ops; > - b->number = b->busn_res.start = bus; > + b->number = b->busn_res.start = bridge->busnum; > pci_bus_assign_domain_nr(b, parent); > - b2 = pci_find_bus(pci_domain_nr(b), bus); > + b2 = pci_find_bus(pci_domain_nr(b), b->number); > if (b2) { > /* If we already got to this bus through a different bridge, ignore it */ > dev_dbg(&b2->dev, "bus already known\n"); > goto err_out; > } > > - bridge = pci_alloc_host_bridge(b); > - if (!bridge) > - goto err_out; > - > - bridge->domain = PCI_DOMAIN(db); > - bridge->dev.parent = parent; > - bridge->dev.release = pci_release_host_bridge_dev; > - dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus); > + bridge->bus = b; > + b->bridge = get_device(&bridge->dev); > error = pcibios_root_bridge_prepare(bridge); > - if (error) { > - kfree(bridge); > + if (error) > goto err_out; > - } > > - error = device_register(&bridge->dev); > - if (error) { > - put_device(&bridge->dev); > - goto err_out; > - } > - b->bridge = get_device(&bridge->dev); > device_enable_async_suspend(b->bridge); > pci_set_bus_of_node(b); > > @@ -1946,10 +1908,11 @@ struct pci_bus *pci_create_root_bus(struct device *parent, u32 db, > > b->dev.class = &pcibus_class; > b->dev.parent = b->bridge; > - dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus); > + dev_set_name(&b->dev, "%04x:%02x", bridge->domain, > + b->number); > error = device_register(&b->dev); > if (error) > - goto class_dev_reg_err; > + goto err_out; > > pcibios_add_bus(b); > > @@ -1962,12 +1925,11 @@ struct pci_bus *pci_create_root_bus(struct device *parent, u32 db, > printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev)); > > /* Add initial resources to the bus */ > - resource_list_for_each_entry_safe(window, n, resources) { > - list_move_tail(&window->node, &bridge->windows); > + resource_list_for_each_entry(window, &bridge->windows) { > res = window->res; > offset = window->offset; > if (res->flags & IORESOURCE_BUS) > - pci_bus_insert_busn_res(b, bus, res->end); > + pci_bus_insert_busn_res(b, b->number, res->end); > else > pci_bus_add_resource(b, res, 0); > if (offset) { > @@ -1989,14 +1951,23 @@ struct pci_bus *pci_create_root_bus(struct device *parent, u32 db, > > return b; > > -class_dev_reg_err: > - put_device(&bridge->dev); > - device_unregister(&bridge->dev); > err_out: > kfree(b); > return NULL; > } > > +struct pci_bus *pci_create_root_bus(struct device *parent, u32 db, > + struct pci_ops *ops, void *sysdata, struct list_head *resources) > +{ > + struct pci_host_bridge *host; > + > + host = pci_create_host_bridge(parent, db, resources); > + if (!host) > + return NULL; > + > + return __pci_create_root_bus(host, ops, sysdata); > +} > + > int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max) > { > struct resource *res = &b->busn_res; > @@ -2060,29 +2031,32 @@ void pci_bus_release_busn_res(struct pci_bus *b) > res, ret ? "can not be" : "is"); > } > > -struct pci_bus *pci_scan_root_bus(struct device *parent, u32 db, > - struct pci_ops *ops, void *sysdata, struct list_head *resources) > +static struct pci_bus *__pci_scan_root_bus( > + struct pci_host_bridge *host, struct pci_ops *ops, > + void *sysdata) > { > struct resource_entry *window; > bool found = false; > struct pci_bus *b; > int max; > > - resource_list_for_each_entry(window, resources) > + resource_list_for_each_entry(window, &host->windows) > if (window->res->flags & IORESOURCE_BUS) { > found = true; > break; > } > > - b = pci_create_root_bus(parent, db, ops, sysdata, resources); > - if (!b) > + b = __pci_create_root_bus(host, ops, sysdata); > + if (!b) { > + pci_free_host_bridge(host); > return NULL; > + } > > if (!found) { > dev_info(&b->dev, > "No busn resource found for root bus, will use [bus %02x-ff]\n", > - PCI_BUSNUM(db)); > - pci_bus_insert_busn_res(b, PCI_BUSNUM(db), 255); > + host->busnum); > + pci_bus_insert_busn_res(b, b->number, 255); > } > > max = pci_scan_child_bus(b); > @@ -2092,6 +2066,18 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, u32 db, > > return b; > } > + > +struct pci_bus *pci_scan_root_bus(struct device *parent, u32 db, > + struct pci_ops *ops, void *sysdata, struct list_head *resources) > +{ > + struct pci_host_bridge *host; > + > + host = pci_create_host_bridge(parent, db, resources); > + if (!host) > + return NULL; > + > + return __pci_scan_root_bus(host, ops, sysdata); > +} > EXPORT_SYMBOL(pci_scan_root_bus); > > struct pci_bus *pci_scan_bus(u32 db, struct pci_ops *ops, > diff --git a/include/linux/pci.h b/include/linux/pci.h > index 2b1b998..463eaa3 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -402,6 +402,7 @@ static inline int pci_channel_offline(struct pci_dev *pdev) > > struct pci_host_bridge { > u16 domain; > + u16 busnum; Why do we need this? host_bridge->bus->number and host_bridge->bus->busn_res.start both already contain the same information, and I hate to add a third place. I know pci_create_host_bridge() doesn't have a struct pci_bus at the point where you initialize busnum, but it does have the resource list, which contains the bus number range. > struct device dev; > struct pci_bus *bus; /* root bus */ > struct list_head windows; /* resource_entry */ > -- > 1.7.1 >
>> + host = kzalloc(sizeof(*host), GFP_KERNEL); >> + if (!host) >> + return NULL; >> + >> + host->busnum = bus; >> + host->domain = domain; >> + /* If support CONFIG_PCI_DOMAINS_GENERIC, use >> + * pci_host_assign_domain_nr() to assign domain >> + * number instead PCI_DOMAIN(db). >> + */ > > Follow the normal Linux comment style: > > host->domain = domain; > > /* > * If we support ... > */ OK. > >> + pci_host_assign_domain_nr(host); >> + ... >> >> +struct pci_host_bridge *pci_create_host_bridge( >> + struct device *parent, u32 dombus, struct list_head *resources); >> +void pci_free_host_bridge(struct pci_host_bridge *host); > > A later patch adds another declaration and a blank line here. If you want > the blank line, add it here, when you're adding the first declarations in > this section. OK. > >> #endif /* DRIVERS_PCI_H */ >> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c >> index 3d6befd..27ec612 100644 >> --- a/drivers/pci/probe.c >> +++ b/drivers/pci/probe.c >> @@ -503,31 +503,6 @@ static struct pci_bus *pci_alloc_bus(struct pci_bus *parent) >> return b; >> } ... >> struct pci_host_bridge { >> u16 domain; >> + u16 busnum; > > Why do we need this? host_bridge->bus->number and > host_bridge->bus->busn_res.start both already contain the same information, > and I hate to add a third place. I know pci_create_host_bridge() doesn't > have a struct pci_bus at the point where you initialize busnum, but it does > have the resource list, which contains the bus number range. Hmm, I will try to remove it, I put it here because when call pci_create_root_bus(), I could only pass the pci_host_bridge_ops, don't need to provide the bus number, pci_scan_root_bus() may lack the bus number resource at that time. But I think fix it is not a hard job, I will rework it, thanks. > >> struct device dev; >> struct pci_bus *bus; /* root bus */ >> struct list_head windows; /* resource_entry */ >> -- >> 1.7.1 >> > > . >
On 3/8/15 21:34, Yijing Wang wrote: > This patch separate pci_host_bridge creation out > of pci_create_root_bus(), and try to make a generic > pci_host_bridge, then we could place generic PCI > infos like domain number in it. Also Ripping out > pci_host_bridge creation from pci_create_root_bus() > make code more better readability. Further more, > we could use the generic pci_host_bridge to hold > host bridge specific operations like > pcibios_root_bridge_prepare(). The changes are > transparent to platform host bridge drivers. > > Signed-off-by: Yijing Wang <wangyijing@huawei.com> > Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> > --- > drivers/pci/host-bridge.c | 55 ++++++++++++++++++++++ > drivers/pci/pci.h | 3 + > drivers/pci/probe.c | 114 ++++++++++++++++++++------------------------- > include/linux/pci.h | 1 + > 4 files changed, 109 insertions(+), 64 deletions(-) > > diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c > index 39b2dbe..3bd45e7 100644 > --- a/drivers/pci/host-bridge.c > +++ b/drivers/pci/host-bridge.c > @@ -8,6 +8,61 @@ > > #include "pci.h" > > +static void pci_release_host_bridge_dev(struct device *dev) > +{ > + struct pci_host_bridge *bridge = to_pci_host_bridge(dev); > + > + if (bridge->release_fn) > + bridge->release_fn(bridge); > + > + pci_free_resource_list(&bridge->windows); > + kfree(bridge); > +} > + > +struct pci_host_bridge *pci_create_host_bridge( > + struct device *parent, u32 db, struct list_head *resources) > +{ > + int error; > + int bus = PCI_BUSNUM(db); > + int domain = PCI_DOMAIN(db); > + struct pci_host_bridge *host; > + struct resource_entry *window, *n; > + > + host = kzalloc(sizeof(*host), GFP_KERNEL); > + if (!host) > + return NULL; > + > + host->busnum = bus; > + host->domain = domain; > + /* If support CONFIG_PCI_DOMAINS_GENERIC, use > + * pci_host_assign_domain_nr() to assign domain > + * number instead PCI_DOMAIN(db). > + */ > + pci_host_assign_domain_nr(host); At this point, host->dev.parent has not been assigned. However, when calling pci_host_assign_domain_nr(host), it calls pci_assign_domain_nr(host->dev.parent), which uses parent->of_node directly w/o checking if parent is NULL. This ended up causing NULL pointer exception when I do the test. I think we need to moveo host->dev.parent = parent before calling pci_host_assign_domain_nr(host). Thanks, Suravee
>> +struct pci_host_bridge *pci_create_host_bridge( >> + struct device *parent, u32 db, struct list_head *resources) >> +{ >> + int error; >> + int bus = PCI_BUSNUM(db); >> + int domain = PCI_DOMAIN(db); >> + struct pci_host_bridge *host; >> + struct resource_entry *window, *n; >> + >> + host = kzalloc(sizeof(*host), GFP_KERNEL); >> + if (!host) >> + return NULL; >> + >> + host->busnum = bus; >> + host->domain = domain; >> + /* If support CONFIG_PCI_DOMAINS_GENERIC, use >> + * pci_host_assign_domain_nr() to assign domain >> + * number instead PCI_DOMAIN(db). >> + */ >> + pci_host_assign_domain_nr(host); > > At this point, host->dev.parent has not been assigned. However, when calling pci_host_assign_domain_nr(host), it calls pci_assign_domain_nr(host->dev.parent), which uses parent->of_node directly w/o checking if parent is NULL. This ended up causing NULL pointer exception when I do the test. > > I think we need to moveo host->dev.parent = parent before calling pci_host_assign_domain_nr(host). Good catch! Hi Suravee, thanks for your test, I would assign host->dev.parent before pci_host_assign_domain_nr(). Thanks! Yijing. > > . >
diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c index 39b2dbe..3bd45e7 100644 --- a/drivers/pci/host-bridge.c +++ b/drivers/pci/host-bridge.c @@ -8,6 +8,61 @@ #include "pci.h" +static void pci_release_host_bridge_dev(struct device *dev) +{ + struct pci_host_bridge *bridge = to_pci_host_bridge(dev); + + if (bridge->release_fn) + bridge->release_fn(bridge); + + pci_free_resource_list(&bridge->windows); + kfree(bridge); +} + +struct pci_host_bridge *pci_create_host_bridge( + struct device *parent, u32 db, struct list_head *resources) +{ + int error; + int bus = PCI_BUSNUM(db); + int domain = PCI_DOMAIN(db); + struct pci_host_bridge *host; + struct resource_entry *window, *n; + + host = kzalloc(sizeof(*host), GFP_KERNEL); + if (!host) + return NULL; + + host->busnum = bus; + host->domain = domain; + /* If support CONFIG_PCI_DOMAINS_GENERIC, use + * pci_host_assign_domain_nr() to assign domain + * number instead PCI_DOMAIN(db). + */ + pci_host_assign_domain_nr(host); + + host->dev.parent = parent; + INIT_LIST_HEAD(&host->windows); + host->dev.release = pci_release_host_bridge_dev; + dev_set_name(&host->dev, "pci%04x:%02x", host->domain, + host->busnum); + + error = device_register(&host->dev); + if (error) { + put_device(&host->dev); + return NULL; + } + + resource_list_for_each_entry_safe(window, n, resources) + list_move_tail(&window->node, &host->windows); + + return host; +} + +void pci_free_host_bridge(struct pci_host_bridge *host) +{ + device_unregister(&host->dev); +} + static struct pci_bus *find_pci_root_bus(struct pci_bus *bus) { while (bus->parent) diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index eeacab9..3de5e51 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -323,4 +323,7 @@ static inline int pci_dev_specific_reset(struct pci_dev *dev, int probe) } #endif +struct pci_host_bridge *pci_create_host_bridge( + struct device *parent, u32 dombus, struct list_head *resources); +void pci_free_host_bridge(struct pci_host_bridge *host); #endif /* DRIVERS_PCI_H */ diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 3d6befd..27ec612 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -503,31 +503,6 @@ static struct pci_bus *pci_alloc_bus(struct pci_bus *parent) return b; } -static void pci_release_host_bridge_dev(struct device *dev) -{ - struct pci_host_bridge *bridge = to_pci_host_bridge(dev); - - if (bridge->release_fn) - bridge->release_fn(bridge); - - pci_free_resource_list(&bridge->windows); - - kfree(bridge); -} - -static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b) -{ - struct pci_host_bridge *bridge; - - bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); - if (!bridge) - return NULL; - - INIT_LIST_HEAD(&bridge->windows); - bridge->bus = b; - return bridge; -} - static const unsigned char pcix_bus_speed[] = { PCI_SPEED_UNKNOWN, /* 0 */ PCI_SPEED_66MHz_PCIX, /* 1 */ @@ -1890,54 +1865,41 @@ void __weak pcibios_remove_bus(struct pci_bus *bus) { } -struct pci_bus *pci_create_root_bus(struct device *parent, u32 db, - struct pci_ops *ops, void *sysdata, struct list_head *resources) +static struct pci_bus *__pci_create_root_bus( + struct pci_host_bridge *bridge, struct pci_ops *ops, + void *sysdata) { int error; - struct pci_host_bridge *bridge; struct pci_bus *b, *b2; - struct resource_entry *window, *n; + struct resource_entry *window; + struct device *parent; struct resource *res; resource_size_t offset; char bus_addr[64]; char *fmt; - u8 bus = PCI_BUSNUM(db); + parent = bridge->dev.parent; b = pci_alloc_bus(NULL); if (!b) return NULL; b->sysdata = sysdata; b->ops = ops; - b->number = b->busn_res.start = bus; + b->number = b->busn_res.start = bridge->busnum; pci_bus_assign_domain_nr(b, parent); - b2 = pci_find_bus(pci_domain_nr(b), bus); + b2 = pci_find_bus(pci_domain_nr(b), b->number); if (b2) { /* If we already got to this bus through a different bridge, ignore it */ dev_dbg(&b2->dev, "bus already known\n"); goto err_out; } - bridge = pci_alloc_host_bridge(b); - if (!bridge) - goto err_out; - - bridge->domain = PCI_DOMAIN(db); - bridge->dev.parent = parent; - bridge->dev.release = pci_release_host_bridge_dev; - dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus); + bridge->bus = b; + b->bridge = get_device(&bridge->dev); error = pcibios_root_bridge_prepare(bridge); - if (error) { - kfree(bridge); + if (error) goto err_out; - } - error = device_register(&bridge->dev); - if (error) { - put_device(&bridge->dev); - goto err_out; - } - b->bridge = get_device(&bridge->dev); device_enable_async_suspend(b->bridge); pci_set_bus_of_node(b); @@ -1946,10 +1908,11 @@ struct pci_bus *pci_create_root_bus(struct device *parent, u32 db, b->dev.class = &pcibus_class; b->dev.parent = b->bridge; - dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus); + dev_set_name(&b->dev, "%04x:%02x", bridge->domain, + b->number); error = device_register(&b->dev); if (error) - goto class_dev_reg_err; + goto err_out; pcibios_add_bus(b); @@ -1962,12 +1925,11 @@ struct pci_bus *pci_create_root_bus(struct device *parent, u32 db, printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev)); /* Add initial resources to the bus */ - resource_list_for_each_entry_safe(window, n, resources) { - list_move_tail(&window->node, &bridge->windows); + resource_list_for_each_entry(window, &bridge->windows) { res = window->res; offset = window->offset; if (res->flags & IORESOURCE_BUS) - pci_bus_insert_busn_res(b, bus, res->end); + pci_bus_insert_busn_res(b, b->number, res->end); else pci_bus_add_resource(b, res, 0); if (offset) { @@ -1989,14 +1951,23 @@ struct pci_bus *pci_create_root_bus(struct device *parent, u32 db, return b; -class_dev_reg_err: - put_device(&bridge->dev); - device_unregister(&bridge->dev); err_out: kfree(b); return NULL; } +struct pci_bus *pci_create_root_bus(struct device *parent, u32 db, + struct pci_ops *ops, void *sysdata, struct list_head *resources) +{ + struct pci_host_bridge *host; + + host = pci_create_host_bridge(parent, db, resources); + if (!host) + return NULL; + + return __pci_create_root_bus(host, ops, sysdata); +} + int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max) { struct resource *res = &b->busn_res; @@ -2060,29 +2031,32 @@ void pci_bus_release_busn_res(struct pci_bus *b) res, ret ? "can not be" : "is"); } -struct pci_bus *pci_scan_root_bus(struct device *parent, u32 db, - struct pci_ops *ops, void *sysdata, struct list_head *resources) +static struct pci_bus *__pci_scan_root_bus( + struct pci_host_bridge *host, struct pci_ops *ops, + void *sysdata) { struct resource_entry *window; bool found = false; struct pci_bus *b; int max; - resource_list_for_each_entry(window, resources) + resource_list_for_each_entry(window, &host->windows) if (window->res->flags & IORESOURCE_BUS) { found = true; break; } - b = pci_create_root_bus(parent, db, ops, sysdata, resources); - if (!b) + b = __pci_create_root_bus(host, ops, sysdata); + if (!b) { + pci_free_host_bridge(host); return NULL; + } if (!found) { dev_info(&b->dev, "No busn resource found for root bus, will use [bus %02x-ff]\n", - PCI_BUSNUM(db)); - pci_bus_insert_busn_res(b, PCI_BUSNUM(db), 255); + host->busnum); + pci_bus_insert_busn_res(b, b->number, 255); } max = pci_scan_child_bus(b); @@ -2092,6 +2066,18 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, u32 db, return b; } + +struct pci_bus *pci_scan_root_bus(struct device *parent, u32 db, + struct pci_ops *ops, void *sysdata, struct list_head *resources) +{ + struct pci_host_bridge *host; + + host = pci_create_host_bridge(parent, db, resources); + if (!host) + return NULL; + + return __pci_scan_root_bus(host, ops, sysdata); +} EXPORT_SYMBOL(pci_scan_root_bus); struct pci_bus *pci_scan_bus(u32 db, struct pci_ops *ops, diff --git a/include/linux/pci.h b/include/linux/pci.h index 2b1b998..463eaa3 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -402,6 +402,7 @@ static inline int pci_channel_offline(struct pci_dev *pdev) struct pci_host_bridge { u16 domain; + u16 busnum; struct device dev; struct pci_bus *bus; /* root bus */ struct list_head windows; /* resource_entry */