| Message ID | 1421372666-12288-19-git-send-email-wangyijing@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Friday 16 January 2015 09:44:16 Yijing Wang wrote: > +static void pci_host_bridge_probe_mode( > + struct pci_host_bridge *host) > +{ > + host->of_scan = true; > +} > I probably missed something here, but where does host->of_scan get used? Arnd -- 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 2015/1/16 18:01, Arnd Bergmann wrote: > On Friday 16 January 2015 09:44:16 Yijing Wang wrote: >> +static void pci_host_bridge_probe_mode( >> + struct pci_host_bridge *host) >> +{ >> + host->of_scan = true; >> +} >> > > I probably missed something here, but where does host->of_scan > get used? > It is used in __pci_scan_root_bus() to detect whether of scan bus is needed in patch 11. @@ -2051,10 +2053,17 @@ static struct pci_bus *__pci_scan_root_bus( pci_bus_insert_busn_res(b, host->busnum, 255); } - max = pci_scan_child_bus(b); + if (host->ops && host->ops->phb_probe_mode) + host->ops->phb_probe_mode(host); - if (!found) - pci_bus_update_busn_res_end(b, max); + if (host->of_scan) { + if (host->ops &&host->ops->phb_of_scan_bus) + host->ops->phb_of_scan_bus(host); + } else { + max = pci_scan_child_bus(b); + if (!found) + pci_bus_update_busn_res_end(b, max); + } return b; Thanks! Yijing. > Arnd > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > > . >
On Monday 19 January 2015 11:17:02 Yijing Wang wrote: > On 2015/1/16 18:01, Arnd Bergmann wrote: > > On Friday 16 January 2015 09:44:16 Yijing Wang wrote: > >> +static void pci_host_bridge_probe_mode( > >> + struct pci_host_bridge *host) > >> +{ > >> + host->of_scan = true; > >> +} > >> > > > > I probably missed something here, but where does host->of_scan > > get used? > > > > It is used in __pci_scan_root_bus() to detect whether of scan bus is needed in patch 11. Ok, I see it now. > @@ -2051,10 +2053,17 @@ static struct pci_bus *__pci_scan_root_bus( > pci_bus_insert_busn_res(b, host->busnum, 255); > } > > - max = pci_scan_child_bus(b); > + if (host->ops && host->ops->phb_probe_mode) > + host->ops->phb_probe_mode(host); > > - if (!found) > - pci_bus_update_busn_res_end(b, max); > + if (host->of_scan) { > + if (host->ops &&host->ops->phb_of_scan_bus) > + host->ops->phb_of_scan_bus(host); > + } else { > + max = pci_scan_child_bus(b); > + if (!found) > + pci_bus_update_busn_res_end(b, max); > + } > I think we can simplify this based on the knowledge that this code will remain powerpc specific. How about removing the phb_probe_mode() callback and replacing it with just a phb_scan_bus() callback that will always get set on sparc, and do this on powerpc: +static void pci_host_bridge_of_scan_bus(struct pci_host_bridge *host) +{ + int mode = PCI_PROBE_NORMAL; + struct pci_bus *bus = host->bus; + struct pci_controller *hose = dev_get_drvdata(&host->dev); + + /* Get probe mode and perform scan */ + if (hose->dn && ppc_md.pci_probe_mode) + mode = ppc_md.pci_probe_mode(bus); + + pr_debug(" probe mode: %d\n", mode); + if (mode == PCI_PROBE_DEVTREE) { + of_scan_bus(host->dn, bus); + return max; // XXX need to get this from somewhere + } + return pci_scan_child_bus(b); +} Would that work? Arnd -- 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 2015/1/19 16:44, Arnd Bergmann wrote: > On Monday 19 January 2015 11:17:02 Yijing Wang wrote: >> On 2015/1/16 18:01, Arnd Bergmann wrote: >>> On Friday 16 January 2015 09:44:16 Yijing Wang wrote: >>>> +static void pci_host_bridge_probe_mode( >>>> + struct pci_host_bridge *host) >>>> +{ >>>> + host->of_scan = true; >>>> +} >>>> >>> >>> I probably missed something here, but where does host->of_scan >>> get used? >>> >> >> It is used in __pci_scan_root_bus() to detect whether of scan bus is needed in patch 11. > > Ok, I see it now. > >> @@ -2051,10 +2053,17 @@ static struct pci_bus *__pci_scan_root_bus( >> pci_bus_insert_busn_res(b, host->busnum, 255); >> } >> >> - max = pci_scan_child_bus(b); >> + if (host->ops && host->ops->phb_probe_mode) >> + host->ops->phb_probe_mode(host); >> >> - if (!found) >> - pci_bus_update_busn_res_end(b, max); >> + if (host->of_scan) { >> + if (host->ops &&host->ops->phb_of_scan_bus) >> + host->ops->phb_of_scan_bus(host); >> + } else { >> + max = pci_scan_child_bus(b); >> + if (!found) >> + pci_bus_update_busn_res_end(b, max); >> + } >> > > I think we can simplify this based on the knowledge that this code > will remain powerpc specific. How about removing the phb_probe_mode() > callback and replacing it with just a phb_scan_bus() callback that > will always get set on sparc, and do this on powerpc: > > +static void pci_host_bridge_of_scan_bus(struct pci_host_bridge *host) > +{ > + int mode = PCI_PROBE_NORMAL; > + struct pci_bus *bus = host->bus; > + struct pci_controller *hose = dev_get_drvdata(&host->dev); > + > + /* Get probe mode and perform scan */ > + if (hose->dn && ppc_md.pci_probe_mode) > + mode = ppc_md.pci_probe_mode(bus); > + > + pr_debug(" probe mode: %d\n", mode); > + if (mode == PCI_PROBE_DEVTREE) { > + of_scan_bus(host->dn, bus); > + return max; // XXX need to get this from somewhere > + } > + return pci_scan_child_bus(b); > +} > > Would that work? This looks good to me, it is more simple. Thanks! Yijing. > Arnd > > . >
diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c index d798b42..42dc21f 100644 --- a/arch/sparc/kernel/pci.c +++ b/arch/sparc/kernel/pci.c @@ -647,12 +647,31 @@ static void pci_claim_bus_resources(struct pci_bus *bus) pci_claim_bus_resources(child_bus); } +static void pci_host_bridge_probe_mode( + struct pci_host_bridge *host) +{ + host->of_scan = true; +} + +static void pci_host_bridge_of_scan_bus( + struct pci_host_bridge *host) +{ + struct pci_pbm_info *pbm = dev_get_drvdata(&host->dev); + struct device_node *node = pbm->op->dev.of_node; + + pci_of_scan_bus(pbm, node, host->bus); +} + +static struct pci_host_bridge_ops phb_ops = { + .phb_of_scan_bus, +}; + struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm, struct device *parent) { LIST_HEAD(resources); struct device_node *node = pbm->op->dev.of_node; - struct pci_bus *bus; + struct pci_host_bridge *host; printk("PCI: Scanning PBM %s\n", node->full_name); @@ -664,17 +683,16 @@ struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm, pbm->busn.end = pbm->pci_last_busno; pbm->busn.flags = IORESOURCE_BUS; pci_add_resource(&resources, &pbm->busn); - bus = pci_create_root_bus(parent, + host = pci_scan_root_bridge(parent, PCI_DOMBUS(pbm->index, pbm->pci_first_busno), - pbm->pci_ops, pbm, &resources); - if (!bus) { - printk(KERN_ERR "Failed to create bus for %s\n", + pbm->pci_ops, pbm, &resources, &phb_ops); + if (!host) { + printk(KERN_ERR "Failed to create host bridge for %s\n", node->full_name); pci_free_resource_list(&resources); return NULL; } - pci_of_scan_bus(pbm, node, bus); pci_bus_add_devices(bus); pci_bus_register_of_sysfs(bus);
Now we could use pci_scan_root_bridge() to scan pci buses, provide sparc specific pci_host_bridge_ops. Signed-off-by: Yijing Wang <wangyijing@huawei.com> --- arch/sparc/kernel/pci.c | 30 ++++++++++++++++++++++++------ 1 files changed, 24 insertions(+), 6 deletions(-)