| Message ID | 1358495602-22867-12-git-send-email-yinghai@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Thursday, January 17, 2013 11:53:22 PM Yinghai Lu wrote: > We want to put created pci device in the device tree as soon as possible. > - just after we find it and create pci_dev struct for it. > so for_pci_dev iteration will not miss them. > > But at that time, we can not load driver for them yet. Need to be after > pci_assign_unsigned_resources() etc to make sure all pci devices get > resource allocated at first. > > Move out device registering out of pci_bus_add_devices, and > new pci_bus_add_devices() will do the device_attach work to load pci drivers > > Signed-off-by: Yinghai Lu <yinghai@kernel.org> > --- > drivers/pci/bus.c | 47 +++-------------------------------------------- > drivers/pci/iov.c | 7 ------- > drivers/pci/probe.c | 34 +++++++++++++++++++++++++++------- > 3 files changed, 30 insertions(+), 58 deletions(-) > > diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c > index 18c1c6d..0a55845 100644 > --- a/drivers/pci/bus.c > +++ b/drivers/pci/bus.c > @@ -178,22 +178,9 @@ static void pci_bus_attach_device(struct pci_dev *dev) > */ > int pci_bus_add_device(struct pci_dev *dev) > { > - int retval; > - > - pci_fixup_device(pci_fixup_final, dev); > - > - retval = pcibios_add_device(dev); > - if (retval) > - return retval; > - > - retval = device_add(&dev->dev); > - if (retval) > - return retval; > - > pci_bus_attach_device(dev); > dev->is_added = 1; > - pci_proc_attach_device(dev); > - pci_create_sysfs_dev_files(dev); > + > return 0; > } > > @@ -205,21 +192,9 @@ int pci_bus_add_device(struct pci_dev *dev) > */ > int pci_bus_add_child(struct pci_bus *bus) > { > - int retval; > - > - if (bus->bridge) > - bus->dev.parent = bus->bridge; > - > - retval = device_register(&bus->dev); > - if (retval) > - return retval; > - > bus->is_added = 1; > > - /* Create legacy_io and legacy_mem files for this bus */ > - pci_create_legacy_files(bus); > - > - return retval; > + return 0; > } Well, what sense does this make to keep that function as is after removing almost all of the code from it? > > /** > @@ -245,36 +220,20 @@ void pci_bus_add_devices(const struct pci_bus *bus) > if (dev->is_added) > continue; > retval = pci_bus_add_device(dev); > - if (retval) > - dev_err(&dev->dev, "Error adding device, continuing\n"); > } > > list_for_each_entry(dev, &bus->devices, bus_list) { > BUG_ON(!dev->is_added); > > child = dev->subordinate; > - /* > - * If there is an unattached subordinate bus, attach > - * it and then scan for unattached PCI devices. > - */ > + > if (!child) > continue; > - if (list_empty(&child->node)) { > - down_write(&pci_bus_sem); > - list_add_tail(&child->node, &dev->bus->children); > - up_write(&pci_bus_sem); > - } This doesn't seem to have a replacement. Why isn't it necessary any more? > pci_bus_add_devices(child); > > - /* > - * register the bus with sysfs as the parent is now > - * properly registered. > - */ > if (child->is_added) > continue; > retval = pci_bus_add_child(child); > - if (retval) > - dev_err(&dev->dev, "Error adding bus, continuing\n"); > } > } > > diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c > index bafd2bb..dbad72e 100644 > --- a/drivers/pci/iov.c > +++ b/drivers/pci/iov.c > @@ -48,12 +48,7 @@ static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr) > return NULL; > > pci_bus_insert_busn_res(child, busnr, busnr); > - child->dev.parent = bus->bridge; > rc = pci_bus_add_child(child); > - if (rc) { > - pci_remove_bus(child); > - return NULL; > - } > > return child; > } > @@ -123,8 +118,6 @@ static int virtfn_add(struct pci_dev *dev, int id, int reset) > virtfn->is_virtfn = 1; > > rc = pci_bus_add_device(virtfn); > - if (rc) > - goto failed1; > sprintf(buf, "virtfn%u", id); > rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf); > if (rc) > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c > index 9588207..6392dac 100644 > --- a/drivers/pci/probe.c > +++ b/drivers/pci/probe.c > @@ -623,6 +623,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, > { > struct pci_bus *child; > int i; > + int ret; > > /* > * Allocate a new bus, and inherit stuff from the parent.. > @@ -637,8 +638,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, > child->bus_flags = parent->bus_flags; > > /* initialize some portions of the bus device, but don't register it > - * now as the parent is not properly set up yet. This device will get > - * registered later in pci_bus_add_devices() > + * now as the parent is not properly set up yet. > */ > child->dev.class = &pcibus_class; > dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr); > @@ -651,11 +651,14 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, > child->primary = parent->busn_res.start; > child->busn_res.end = 0xff; > > - if (!bridge) > - return child; > + if (!bridge) { > + child->dev.parent = parent->bridge; > + goto add_dev; > + } > > child->self = bridge; > child->bridge = get_device(&bridge->dev); > + child->dev.parent = child->bridge; > pci_set_bus_of_node(child); > pci_set_bus_speed(child); > > @@ -666,6 +669,13 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, > } > bridge->subordinate = child; > > +add_dev: > + ret = device_register(&child->dev); > + WARN_ON(ret < 0); > + > + /* Create legacy_io and legacy_mem files for this bus */ > + pci_create_legacy_files(child); > + > return child; > } > > @@ -1296,6 +1306,8 @@ static void pci_init_capabilities(struct pci_dev *dev) > > void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) > { > + int ret; > + > device_initialize(&dev->dev); > dev->dev.release = pci_release_dev; > > @@ -1326,6 +1338,16 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) > down_write(&pci_bus_sem); > list_add_tail(&dev->bus_list, &bus->devices); > up_write(&pci_bus_sem); > + > + pci_fixup_device(pci_fixup_final, dev); > + ret = pcibios_add_device(dev); > + WARN_ON(ret < 0); > + /* notifier could use pci capabilities */ > + ret = device_add(&dev->dev); > + WARN_ON(ret < 0); > + > + pci_proc_attach_device(dev); > + pci_create_sysfs_dev_files(dev); > } > > struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn) > @@ -1656,13 +1678,13 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus, > char bus_addr[64]; > char *fmt; > > - > b = pci_alloc_bus(); > if (!b) > return NULL; > > b->sysdata = sysdata; > b->ops = ops; > + b->number = b->busn_res.start = bus; > b2 = pci_find_bus(pci_domain_nr(b), bus); > if (b2) { > /* If we already got to this bus through a different bridge, ignore it */ > @@ -1701,8 +1723,6 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus, > /* Create legacy_io and legacy_mem files for this bus */ > pci_create_legacy_files(b); > > - b->number = b->busn_res.start = bus; > - > if (parent) > dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev)); > else > Thanks, Rafael
On Sun, Jan 20, 2013 at 3:23 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote: > On Thursday, January 17, 2013 11:53:22 PM Yinghai Lu wrote: >> We want to put created pci device in the device tree as soon as possible. >> - just after we find it and create pci_dev struct for it. >> so for_pci_dev iteration will not miss them. >> >> But at that time, we can not load driver for them yet. Need to be after >> pci_assign_unsigned_resources() etc to make sure all pci devices get >> resource allocated at first. >> >> Move out device registering out of pci_bus_add_devices, and >> new pci_bus_add_devices() will do the device_attach work to load pci drivers >> >> Signed-off-by: Yinghai Lu <yinghai@kernel.org> >> --- >> drivers/pci/bus.c | 47 +++-------------------------------------------- >> drivers/pci/iov.c | 7 ------- >> drivers/pci/probe.c | 34 +++++++++++++++++++++++++++------- >> 3 files changed, 30 insertions(+), 58 deletions(-) >> >> diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c >> index 18c1c6d..0a55845 100644 >> --- a/drivers/pci/bus.c >> +++ b/drivers/pci/bus.c >> @@ -178,22 +178,9 @@ static void pci_bus_attach_device(struct pci_dev *dev) >> */ .. >> @@ -205,21 +192,9 @@ int pci_bus_add_device(struct pci_dev *dev) >> */ >> int pci_bus_add_child(struct pci_bus *bus) >> { >> - int retval; >> - >> - if (bus->bridge) >> - bus->dev.parent = bus->bridge; >> - >> - retval = device_register(&bus->dev); >> - if (retval) >> - return retval; >> - >> bus->is_added = 1; >> >> - /* Create legacy_io and legacy_mem files for this bus */ >> - pci_create_legacy_files(bus); >> - >> - return retval; >> + return 0; >> } > > Well, what sense does this make to keep that function as is after removing > almost all of the code from it? ok, will remove that function. ... >> list_for_each_entry(dev, &bus->devices, bus_list) { >> BUG_ON(!dev->is_added); >> >> child = dev->subordinate; >> - /* >> - * If there is an unattached subordinate bus, attach >> - * it and then scan for unattached PCI devices. >> - */ >> + >> if (!child) >> continue; >> - if (list_empty(&child->node)) { >> - down_write(&pci_bus_sem); >> - list_add_tail(&child->node, &dev->bus->children); >> - up_write(&pci_bus_sem); >> - } > > This doesn't seem to have a replacement. Why isn't it necessary any more? > add that in changelog, so related changlog will be: --- Also remove unattached child bus handling in pci_bus_add_devices(). Because that is not needed, child bus via pci_add_new_bus() is already in parent bus children list. --- -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c index 18c1c6d..0a55845 100644 --- a/drivers/pci/bus.c +++ b/drivers/pci/bus.c @@ -178,22 +178,9 @@ static void pci_bus_attach_device(struct pci_dev *dev) */ int pci_bus_add_device(struct pci_dev *dev) { - int retval; - - pci_fixup_device(pci_fixup_final, dev); - - retval = pcibios_add_device(dev); - if (retval) - return retval; - - retval = device_add(&dev->dev); - if (retval) - return retval; - pci_bus_attach_device(dev); dev->is_added = 1; - pci_proc_attach_device(dev); - pci_create_sysfs_dev_files(dev); + return 0; } @@ -205,21 +192,9 @@ int pci_bus_add_device(struct pci_dev *dev) */ int pci_bus_add_child(struct pci_bus *bus) { - int retval; - - if (bus->bridge) - bus->dev.parent = bus->bridge; - - retval = device_register(&bus->dev); - if (retval) - return retval; - bus->is_added = 1; - /* Create legacy_io and legacy_mem files for this bus */ - pci_create_legacy_files(bus); - - return retval; + return 0; } /** @@ -245,36 +220,20 @@ void pci_bus_add_devices(const struct pci_bus *bus) if (dev->is_added) continue; retval = pci_bus_add_device(dev); - if (retval) - dev_err(&dev->dev, "Error adding device, continuing\n"); } list_for_each_entry(dev, &bus->devices, bus_list) { BUG_ON(!dev->is_added); child = dev->subordinate; - /* - * If there is an unattached subordinate bus, attach - * it and then scan for unattached PCI devices. - */ + if (!child) continue; - if (list_empty(&child->node)) { - down_write(&pci_bus_sem); - list_add_tail(&child->node, &dev->bus->children); - up_write(&pci_bus_sem); - } pci_bus_add_devices(child); - /* - * register the bus with sysfs as the parent is now - * properly registered. - */ if (child->is_added) continue; retval = pci_bus_add_child(child); - if (retval) - dev_err(&dev->dev, "Error adding bus, continuing\n"); } } diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index bafd2bb..dbad72e 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -48,12 +48,7 @@ static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr) return NULL; pci_bus_insert_busn_res(child, busnr, busnr); - child->dev.parent = bus->bridge; rc = pci_bus_add_child(child); - if (rc) { - pci_remove_bus(child); - return NULL; - } return child; } @@ -123,8 +118,6 @@ static int virtfn_add(struct pci_dev *dev, int id, int reset) virtfn->is_virtfn = 1; rc = pci_bus_add_device(virtfn); - if (rc) - goto failed1; sprintf(buf, "virtfn%u", id); rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf); if (rc) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 9588207..6392dac 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -623,6 +623,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, { struct pci_bus *child; int i; + int ret; /* * Allocate a new bus, and inherit stuff from the parent.. @@ -637,8 +638,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, child->bus_flags = parent->bus_flags; /* initialize some portions of the bus device, but don't register it - * now as the parent is not properly set up yet. This device will get - * registered later in pci_bus_add_devices() + * now as the parent is not properly set up yet. */ child->dev.class = &pcibus_class; dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr); @@ -651,11 +651,14 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, child->primary = parent->busn_res.start; child->busn_res.end = 0xff; - if (!bridge) - return child; + if (!bridge) { + child->dev.parent = parent->bridge; + goto add_dev; + } child->self = bridge; child->bridge = get_device(&bridge->dev); + child->dev.parent = child->bridge; pci_set_bus_of_node(child); pci_set_bus_speed(child); @@ -666,6 +669,13 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent, } bridge->subordinate = child; +add_dev: + ret = device_register(&child->dev); + WARN_ON(ret < 0); + + /* Create legacy_io and legacy_mem files for this bus */ + pci_create_legacy_files(child); + return child; } @@ -1296,6 +1306,8 @@ static void pci_init_capabilities(struct pci_dev *dev) void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) { + int ret; + device_initialize(&dev->dev); dev->dev.release = pci_release_dev; @@ -1326,6 +1338,16 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) down_write(&pci_bus_sem); list_add_tail(&dev->bus_list, &bus->devices); up_write(&pci_bus_sem); + + pci_fixup_device(pci_fixup_final, dev); + ret = pcibios_add_device(dev); + WARN_ON(ret < 0); + /* notifier could use pci capabilities */ + ret = device_add(&dev->dev); + WARN_ON(ret < 0); + + pci_proc_attach_device(dev); + pci_create_sysfs_dev_files(dev); } struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn) @@ -1656,13 +1678,13 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus, char bus_addr[64]; char *fmt; - b = pci_alloc_bus(); if (!b) return NULL; b->sysdata = sysdata; b->ops = ops; + b->number = b->busn_res.start = bus; b2 = pci_find_bus(pci_domain_nr(b), bus); if (b2) { /* If we already got to this bus through a different bridge, ignore it */ @@ -1701,8 +1723,6 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus, /* Create legacy_io and legacy_mem files for this bus */ pci_create_legacy_files(b); - b->number = b->busn_res.start = bus; - if (parent) dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev)); else
We want to put created pci device in the device tree as soon as possible. - just after we find it and create pci_dev struct for it. so for_pci_dev iteration will not miss them. But at that time, we can not load driver for them yet. Need to be after pci_assign_unsigned_resources() etc to make sure all pci devices get resource allocated at first. Move out device registering out of pci_bus_add_devices, and new pci_bus_add_devices() will do the device_attach work to load pci drivers Signed-off-by: Yinghai Lu <yinghai@kernel.org> --- drivers/pci/bus.c | 47 +++-------------------------------------------- drivers/pci/iov.c | 7 ------- drivers/pci/probe.c | 34 +++++++++++++++++++++++++++------- 3 files changed, 30 insertions(+), 58 deletions(-)