| Message ID | 1442218057-4355-5-git-send-email-jiang.liu@linux.intel.com |
|---|---|
| State | Not Applicable |
| Headers | show |
Hi Jiang, Strictly speaking, this patch by itself doesn't actually "consolidate" anything because it only adds acpi_pci_root_create() (which isn't called by anything yet), but doesn't remove the original x86 copy. On Mon, Sep 14, 2015 at 04:07:33PM +0800, Jiang Liu wrote: > Introduce common interface acpi_pci_root_create() and related data > structures to create PCI root bus for ACPI PCI host bridges. It will > be used to kill duplicated arch specific code for IA64 and x86. It may > also help ARM64 in future. > > Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> > Tested-by: Tony Luck <tony.luck@intel.com> > Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Some minor structuring comments below, but my ack is valid even if you don't address them. > --- > drivers/acpi/pci_root.c | 204 ++++++++++++++++++++++++++++++++++++++++++++++ > include/linux/pci-acpi.h | 23 ++++++ > 2 files changed, 227 insertions(+) > > diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c > index 393706a5261b..48d27bd35b58 100644 > --- a/drivers/acpi/pci_root.c > +++ b/drivers/acpi/pci_root.c > @@ -652,6 +652,210 @@ static void acpi_pci_root_remove(struct acpi_device *device) > kfree(root); > } > > +/* > + * Following code to support acpi_pci_root_create() is copied from > + * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64 > + * and ARM64. > + */ > +static void acpi_pci_root_validate_resources(struct device *dev, > + struct list_head *resources, > + unsigned long type) > +{ > + LIST_HEAD(list); > + struct resource *res1, *res2, *root = NULL; > + struct resource_entry *tmp, *entry, *entry2; > + > + BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0); > + root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource; > + > + list_splice_init(resources, &list); > + resource_list_for_each_entry_safe(entry, tmp, &list) { > + bool free = false; > + resource_size_t end; > + > + res1 = entry->res; > + if (!(res1->flags & type)) > + goto next; > + > + /* Exclude non-addressable range or non-addressable portion */ > + end = min(res1->end, root->end); > + if (end <= res1->start) { > + dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n", > + res1); > + free = true; > + goto next; > + } else if (res1->end != end) { > + dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n", > + res1, (unsigned long long)end + 1, > + (unsigned long long)res1->end); > + res1->end = end; > + } > + > + resource_list_for_each_entry(entry2, resources) { > + res2 = entry2->res; > + if (!(res2->flags & type)) > + continue; > + > + /* > + * I don't like throwing away windows because then > + * our resources no longer match the ACPI _CRS, but > + * the kernel resource tree doesn't allow overlaps. > + */ > + if (resource_overlaps(res1, res2)) { > + res2->start = min(res1->start, res2->start); > + res2->end = max(res1->end, res2->end); > + dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n", > + res2, res1); > + free = true; > + goto next; > + } > + } > + > +next: > + resource_list_del(entry); > + if (free) > + resource_list_free_entry(entry); > + else > + resource_list_add_tail(entry, resources); > + } > +} > + > +static int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info) > +{ > + int ret; > + struct list_head *list = &info->resources; > + struct acpi_device *device = info->bridge; > + struct resource_entry *entry, *tmp; > + unsigned long flags; > + > + flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT; > + ret = acpi_dev_get_resources(device, list, > + acpi_dev_filter_resource_type_cb, > + (void *)flags); > + if (ret < 0) > + dev_warn(&device->dev, > + "failed to parse _CRS method, error code %d\n", ret); > + else if (ret == 0) > + dev_dbg(&device->dev, > + "no IO and memory resources present in _CRS\n"); > + else { > + resource_list_for_each_entry_safe(entry, tmp, list) { > + if (entry->res->flags & IORESOURCE_DISABLED) > + resource_list_destroy_entry(entry); > + else > + entry->res->name = info->name; > + } > + acpi_pci_root_validate_resources(&device->dev, list, > + IORESOURCE_MEM); > + acpi_pci_root_validate_resources(&device->dev, list, > + IORESOURCE_IO); > + } > + > + return ret; > +} > + > +static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info) > +{ > + struct resource_entry *entry, *tmp; > + struct resource *res, *conflict, *root = NULL; > + > + resource_list_for_each_entry_safe(entry, tmp, &info->resources) { > + res = entry->res; > + if (res->flags & IORESOURCE_MEM) > + root = &iomem_resource; > + else if (res->flags & IORESOURCE_IO) > + root = &ioport_resource; > + else > + continue; > + > + conflict = insert_resource_conflict(root, res); > + if (conflict) { > + dev_info(&info->bridge->dev, > + "ignoring host bridge window %pR (conflicts with %s %pR)\n", > + res, conflict->name, conflict); > + resource_list_destroy_entry(entry); > + } > + } > +} > + > +static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info) > +{ > + struct resource *res; > + struct resource_entry *entry, *tmp; > + > + if (!info) > + return; > + > + resource_list_for_each_entry_safe(entry, tmp, &info->resources) { > + res = entry->res; > + if (res->parent && > + (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) > + release_resource(res); > + resource_list_destroy_entry(entry); > + } > + > + info->ops->release_info(info); > +} > + > +static void acpi_pci_root_release_info(struct pci_host_bridge *bridge) > +{ > + struct resource *res; > + struct resource_entry *entry; > + > + resource_list_for_each_entry(entry, &bridge->windows) { > + res = entry->res; > + if (res->parent && > + (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) > + release_resource(res); > + } > + __acpi_pci_root_release_info(bridge->release_data); > +} > + > +struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, > + struct acpi_pci_root_ops *ops, > + struct acpi_pci_root_info *info, > + void *sysdata) > +{ > + int ret, busnum = root->secondary.start; > + struct acpi_device *device = root->device; > + int node = acpi_get_node(device->handle); > + struct pci_bus *bus; > + > + info->root = root; > + info->bridge = device; > + info->ops = ops; > + INIT_LIST_HEAD(&info->resources); > + snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x", > + root->segment, busnum); > + > + if (ops->init_info && ops->init_info(info)) > + goto out_release_info; > + ret = acpi_pci_probe_root_resources(info); > + if (ops->prepare_resources) > + ret = ops->prepare_resources(info, ret); > + if (ret < 0) > + goto out_release_info; > + else if (ret > 0) > + pci_acpi_root_add_resources(info); This is unnecessarily complicated: you set "ret", then overwrite it if ops->prepare_resources. By the time you test "ret", it's messy to figure out what it means. Both ops->prepare_resources() and pci_acpi_root_add_resources() should be able to deal with empty resource lists, so can you do the following instead? ret = acpi_pci_probe_root_resources(info); if (ret < 0) goto out_release_info; if (ops->prepare_resources) { ret = ops->prepare_resources(info, ret); if (ret < 0) goto out_release_info; } pci_acpi_root_add_resources(info); > + pci_add_resource(&info->resources, &root->secondary); > + > + bus = pci_create_root_bus(NULL, busnum, ops->pci_ops, > + sysdata, &info->resources); > + if (bus) { if (!bus) goto out_release_info; Then it looks like the other error paths above, and you can un-indent the following code, which is the normal path: > + pci_scan_child_bus(bus); > + pci_set_host_bridge_release(to_pci_host_bridge(bus->bridge), > + acpi_pci_root_release_info, info); > + if (node != NUMA_NO_NODE) > + dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", > + node); > + return bus; > + } > + > +out_release_info: > + __acpi_pci_root_release_info(info); > + return NULL; > +} > + > void __init acpi_pci_root_init(void) > { > acpi_hest_init(); > diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h > index a965efa52152..583af37c6030 100644 > --- a/include/linux/pci-acpi.h > +++ b/include/linux/pci-acpi.h > @@ -52,6 +52,29 @@ static inline acpi_handle acpi_pci_get_bridge_handle(struct pci_bus *pbus) > return ACPI_HANDLE(dev); > } > > +struct acpi_pci_root; > +struct acpi_pci_root_ops; > + > +struct acpi_pci_root_info { > + struct acpi_pci_root *root; > + struct acpi_device *bridge; > + struct acpi_pci_root_ops *ops; > + struct list_head resources; > + char name[16]; > +}; > + > +struct acpi_pci_root_ops { > + struct pci_ops *pci_ops; > + int (*init_info)(struct acpi_pci_root_info *info); > + void (*release_info)(struct acpi_pci_root_info *info); > + int (*prepare_resources)(struct acpi_pci_root_info *info, int status); > +}; > + > +extern struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, > + struct acpi_pci_root_ops *ops, > + struct acpi_pci_root_info *info, > + void *sd); > + > void acpi_pci_add_bus(struct pci_bus *bus); > void acpi_pci_remove_bus(struct pci_bus *bus); > > -- > 1.7.10.4 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- 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
On 2015/10/7 1:47, Bjorn Helgaas wrote: > Hi Jiang, > > Strictly speaking, this patch by itself doesn't actually "consolidate" > anything because it only adds acpi_pci_root_create() (which isn't called by > anything yet), but doesn't remove the original x86 copy. > <snit> >> +struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, >> + struct acpi_pci_root_ops *ops, >> + struct acpi_pci_root_info *info, >> + void *sysdata) >> +{ >> + int ret, busnum = root->secondary.start; >> + struct acpi_device *device = root->device; >> + int node = acpi_get_node(device->handle); >> + struct pci_bus *bus; >> + >> + info->root = root; >> + info->bridge = device; >> + info->ops = ops; >> + INIT_LIST_HEAD(&info->resources); >> + snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x", >> + root->segment, busnum); >> + >> + if (ops->init_info && ops->init_info(info)) >> + goto out_release_info; >> + ret = acpi_pci_probe_root_resources(info); >> + if (ops->prepare_resources) >> + ret = ops->prepare_resources(info, ret); >> + if (ret < 0) >> + goto out_release_info; >> + else if (ret > 0) >> + pci_acpi_root_add_resources(info); > > This is unnecessarily complicated: you set "ret", then overwrite it if > ops->prepare_resources. By the time you test "ret", it's messy to > figure out what it means. > > Both ops->prepare_resources() and pci_acpi_root_add_resources() > should be able to deal with empty resource lists, so can you do the > following instead? > > ret = acpi_pci_probe_root_resources(info); > if (ret < 0) > goto out_release_info; Hi Bjorn, Thanks for review:) The original code is used to handle a special case for x86, where acpi_pci_probe_root_resources() fails but ops->prepare_resources() succeeds. For x86, PCI host bridge resources may probed by means other than ACPI when pci_use_crs is true (AMD and Broadcom hostbridges). So we can't return failure when acpi_pci_probe_root_resources() fails. + ret = acpi_pci_probe_root_resources(info); + if (ops->prepare_resources) + ret = ops->prepare_resources(info, ret); + if (ret < 0) + goto out_release_info; > if (ops->prepare_resources) { > ret = ops->prepare_resources(info, ret); > if (ret < 0) > goto out_release_info; > } > pci_acpi_root_add_resources(info); I will remove the redundant check of (ret > 0) in: + else if (ret > 0) + pci_acpi_root_add_resources(info); > >> + pci_add_resource(&info->resources, &root->secondary); >> + >> + bus = pci_create_root_bus(NULL, busnum, ops->pci_ops, >> + sysdata, &info->resources); >> + if (bus) { > > if (!bus) > goto out_release_info; > > Then it looks like the other error paths above, and you can un-indent > the following code, which is the normal path: Will do this. Thanks! Gerry -- 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
On Thu, Oct 08, 2015 at 01:32:04PM +0800, Jiang Liu wrote: > On 2015/10/7 1:47, Bjorn Helgaas wrote: > >> +struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, > >> + struct acpi_pci_root_ops *ops, > >> + struct acpi_pci_root_info *info, > >> + void *sysdata) > >> +{ > >> + int ret, busnum = root->secondary.start; > >> + struct acpi_device *device = root->device; > >> + int node = acpi_get_node(device->handle); > >> + struct pci_bus *bus; > >> + > >> + info->root = root; > >> + info->bridge = device; > >> + info->ops = ops; > >> + INIT_LIST_HEAD(&info->resources); > >> + snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x", > >> + root->segment, busnum); > >> + > >> + if (ops->init_info && ops->init_info(info)) > >> + goto out_release_info; > >> + ret = acpi_pci_probe_root_resources(info); > >> + if (ops->prepare_resources) > >> + ret = ops->prepare_resources(info, ret); > >> + if (ret < 0) > >> + goto out_release_info; > >> + else if (ret > 0) > >> + pci_acpi_root_add_resources(info); > > > > This is unnecessarily complicated: you set "ret", then overwrite it if > > ops->prepare_resources. By the time you test "ret", it's messy to > > figure out what it means. > > > > Both ops->prepare_resources() and pci_acpi_root_add_resources() > > should be able to deal with empty resource lists, so can you do the > > following instead? > > > > ret = acpi_pci_probe_root_resources(info); > > if (ret < 0) > > goto out_release_info; > > The original code is used to handle a special case for x86, > where acpi_pci_probe_root_resources() fails but ops->prepare_resources() > succeeds. For x86, PCI host bridge resources may probed by means > other than ACPI when pci_use_crs is true (AMD and Broadcom hostbridges). > So we can't return failure when acpi_pci_probe_root_resources() fails. That's even worse than I thought. I take back my ack; I think this really needs to be restructured so it does the right thing *and* reads clearly. Having convoluted generic code to deal with an arch-specific special case is a recipe for breakage in the future. Maybe you can move the non-ACPI resource probing from prepare_resources() into acpi_pci_probe_root_resources() (you could rename it to something more generic if that helps). > + ret = acpi_pci_probe_root_resources(info); > + if (ops->prepare_resources) > + ret = ops->prepare_resources(info, ret); > + if (ret < 0) > + goto out_release_info; > > > if (ops->prepare_resources) { > > ret = ops->prepare_resources(info, ret); > > if (ret < 0) > > goto out_release_info; > > } > > pci_acpi_root_add_resources(info); > I will remove the redundant check of (ret > 0) in: > + else if (ret > 0) > + pci_acpi_root_add_resources(info); -- 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
On 2015/10/8 21:20, Bjorn Helgaas wrote: > On Thu, Oct 08, 2015 at 01:32:04PM +0800, Jiang Liu wrote: >> On 2015/10/7 1:47, Bjorn Helgaas wrote: >>>> +struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, >>>> + struct acpi_pci_root_ops *ops, >>>> + struct acpi_pci_root_info *info, >>>> + void *sysdata) >>>> +{ >>>> + int ret, busnum = root->secondary.start; >>>> + struct acpi_device *device = root->device; >>>> + int node = acpi_get_node(device->handle); >>>> + struct pci_bus *bus; >>>> + >>>> + info->root = root; >>>> + info->bridge = device; >>>> + info->ops = ops; >>>> + INIT_LIST_HEAD(&info->resources); >>>> + snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x", >>>> + root->segment, busnum); >>>> + >>>> + if (ops->init_info && ops->init_info(info)) >>>> + goto out_release_info; >>>> + ret = acpi_pci_probe_root_resources(info); >>>> + if (ops->prepare_resources) >>>> + ret = ops->prepare_resources(info, ret); >>>> + if (ret < 0) >>>> + goto out_release_info; >>>> + else if (ret > 0) >>>> + pci_acpi_root_add_resources(info); >>> >>> This is unnecessarily complicated: you set "ret", then overwrite it if >>> ops->prepare_resources. By the time you test "ret", it's messy to >>> figure out what it means. >>> >>> Both ops->prepare_resources() and pci_acpi_root_add_resources() >>> should be able to deal with empty resource lists, so can you do the >>> following instead? >>> >>> ret = acpi_pci_probe_root_resources(info); >>> if (ret < 0) >>> goto out_release_info; >> >> The original code is used to handle a special case for x86, >> where acpi_pci_probe_root_resources() fails but ops->prepare_resources() >> succeeds. For x86, PCI host bridge resources may probed by means >> other than ACPI when pci_use_crs is true (AMD and Broadcom hostbridges). >> So we can't return failure when acpi_pci_probe_root_resources() fails. > > That's even worse than I thought. I take back my ack; I think this > really needs to be restructured so it does the right thing *and* reads > clearly. Having convoluted generic code to deal with an arch-specific > special case is a recipe for breakage in the future. > > Maybe you can move the non-ACPI resource probing from > prepare_resources() into acpi_pci_probe_root_resources() (you could > rename it to something more generic if that helps). Hi Bjorn, How about this solution? 1) export acpi_pci_probe_root_resources() as a helper to arch code 2) change ACPI core code as below if (ops->init_info && ops->init_info(info)) goto out_release_info; if (ops->prepare_resources) ret = ops->prepare_resources(info); else ret = acpi_pci_probe_root_resources(info); if (ret < 0) goto out_release_info; pci_acpi_root_add_resources(info); pci_add_resource(&info->resources, &root->secondary); bus = pci_create_root_bus(NULL, busnum, ops->pci_ops, sysdata, &info->resources); if (!bus) goto out_release_info; By this way, if arch has special requirement, it could implement prepare_resources callback and make use of acpi_pci_probe_root_resources() if needed. Thanks! Gerry -- 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/acpi/pci_root.c b/drivers/acpi/pci_root.c index 393706a5261b..48d27bd35b58 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -652,6 +652,210 @@ static void acpi_pci_root_remove(struct acpi_device *device) kfree(root); } +/* + * Following code to support acpi_pci_root_create() is copied from + * arch/x86/pci/acpi.c and modified so it could be reused by x86, IA64 + * and ARM64. + */ +static void acpi_pci_root_validate_resources(struct device *dev, + struct list_head *resources, + unsigned long type) +{ + LIST_HEAD(list); + struct resource *res1, *res2, *root = NULL; + struct resource_entry *tmp, *entry, *entry2; + + BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0); + root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource; + + list_splice_init(resources, &list); + resource_list_for_each_entry_safe(entry, tmp, &list) { + bool free = false; + resource_size_t end; + + res1 = entry->res; + if (!(res1->flags & type)) + goto next; + + /* Exclude non-addressable range or non-addressable portion */ + end = min(res1->end, root->end); + if (end <= res1->start) { + dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n", + res1); + free = true; + goto next; + } else if (res1->end != end) { + dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n", + res1, (unsigned long long)end + 1, + (unsigned long long)res1->end); + res1->end = end; + } + + resource_list_for_each_entry(entry2, resources) { + res2 = entry2->res; + if (!(res2->flags & type)) + continue; + + /* + * I don't like throwing away windows because then + * our resources no longer match the ACPI _CRS, but + * the kernel resource tree doesn't allow overlaps. + */ + if (resource_overlaps(res1, res2)) { + res2->start = min(res1->start, res2->start); + res2->end = max(res1->end, res2->end); + dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n", + res2, res1); + free = true; + goto next; + } + } + +next: + resource_list_del(entry); + if (free) + resource_list_free_entry(entry); + else + resource_list_add_tail(entry, resources); + } +} + +static int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info) +{ + int ret; + struct list_head *list = &info->resources; + struct acpi_device *device = info->bridge; + struct resource_entry *entry, *tmp; + unsigned long flags; + + flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_MEM_8AND16BIT; + ret = acpi_dev_get_resources(device, list, + acpi_dev_filter_resource_type_cb, + (void *)flags); + if (ret < 0) + dev_warn(&device->dev, + "failed to parse _CRS method, error code %d\n", ret); + else if (ret == 0) + dev_dbg(&device->dev, + "no IO and memory resources present in _CRS\n"); + else { + resource_list_for_each_entry_safe(entry, tmp, list) { + if (entry->res->flags & IORESOURCE_DISABLED) + resource_list_destroy_entry(entry); + else + entry->res->name = info->name; + } + acpi_pci_root_validate_resources(&device->dev, list, + IORESOURCE_MEM); + acpi_pci_root_validate_resources(&device->dev, list, + IORESOURCE_IO); + } + + return ret; +} + +static void pci_acpi_root_add_resources(struct acpi_pci_root_info *info) +{ + struct resource_entry *entry, *tmp; + struct resource *res, *conflict, *root = NULL; + + resource_list_for_each_entry_safe(entry, tmp, &info->resources) { + res = entry->res; + if (res->flags & IORESOURCE_MEM) + root = &iomem_resource; + else if (res->flags & IORESOURCE_IO) + root = &ioport_resource; + else + continue; + + conflict = insert_resource_conflict(root, res); + if (conflict) { + dev_info(&info->bridge->dev, + "ignoring host bridge window %pR (conflicts with %s %pR)\n", + res, conflict->name, conflict); + resource_list_destroy_entry(entry); + } + } +} + +static void __acpi_pci_root_release_info(struct acpi_pci_root_info *info) +{ + struct resource *res; + struct resource_entry *entry, *tmp; + + if (!info) + return; + + resource_list_for_each_entry_safe(entry, tmp, &info->resources) { + res = entry->res; + if (res->parent && + (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) + release_resource(res); + resource_list_destroy_entry(entry); + } + + info->ops->release_info(info); +} + +static void acpi_pci_root_release_info(struct pci_host_bridge *bridge) +{ + struct resource *res; + struct resource_entry *entry; + + resource_list_for_each_entry(entry, &bridge->windows) { + res = entry->res; + if (res->parent && + (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) + release_resource(res); + } + __acpi_pci_root_release_info(bridge->release_data); +} + +struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, + struct acpi_pci_root_ops *ops, + struct acpi_pci_root_info *info, + void *sysdata) +{ + int ret, busnum = root->secondary.start; + struct acpi_device *device = root->device; + int node = acpi_get_node(device->handle); + struct pci_bus *bus; + + info->root = root; + info->bridge = device; + info->ops = ops; + INIT_LIST_HEAD(&info->resources); + snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x", + root->segment, busnum); + + if (ops->init_info && ops->init_info(info)) + goto out_release_info; + ret = acpi_pci_probe_root_resources(info); + if (ops->prepare_resources) + ret = ops->prepare_resources(info, ret); + if (ret < 0) + goto out_release_info; + else if (ret > 0) + pci_acpi_root_add_resources(info); + pci_add_resource(&info->resources, &root->secondary); + + bus = pci_create_root_bus(NULL, busnum, ops->pci_ops, + sysdata, &info->resources); + if (bus) { + pci_scan_child_bus(bus); + pci_set_host_bridge_release(to_pci_host_bridge(bus->bridge), + acpi_pci_root_release_info, info); + if (node != NUMA_NO_NODE) + dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", + node); + return bus; + } + +out_release_info: + __acpi_pci_root_release_info(info); + return NULL; +} + void __init acpi_pci_root_init(void) { acpi_hest_init(); diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h index a965efa52152..583af37c6030 100644 --- a/include/linux/pci-acpi.h +++ b/include/linux/pci-acpi.h @@ -52,6 +52,29 @@ static inline acpi_handle acpi_pci_get_bridge_handle(struct pci_bus *pbus) return ACPI_HANDLE(dev); } +struct acpi_pci_root; +struct acpi_pci_root_ops; + +struct acpi_pci_root_info { + struct acpi_pci_root *root; + struct acpi_device *bridge; + struct acpi_pci_root_ops *ops; + struct list_head resources; + char name[16]; +}; + +struct acpi_pci_root_ops { + struct pci_ops *pci_ops; + int (*init_info)(struct acpi_pci_root_info *info); + void (*release_info)(struct acpi_pci_root_info *info); + int (*prepare_resources)(struct acpi_pci_root_info *info, int status); +}; + +extern struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, + struct acpi_pci_root_ops *ops, + struct acpi_pci_root_info *info, + void *sd); + void acpi_pci_add_bus(struct pci_bus *bus); void acpi_pci_remove_bus(struct pci_bus *bus);