| Message ID | 1428053164-28277-21-git-send-email-wangyijing@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
I've been looking at this patch series for a while now, and I now believe it's ready on the PowerPC side. I was originally concerned that it would break odd corner cases, particularly where similar code appears (namely kernel/pci_hotplug.c and kernel/pci_of_scan.c). However, upon further examination, talking with Yijing, and some testing, I'm now convinced that it is indeed restricted to the generic code, and doesn't change behaviour. This is both a plus and a minus: because it's currently restricted to generic code, I'm confident it works, but the down side is that it doesn't yet simplify our arch-specific complexity. We'll need to do some more work on our side to reap the full benefits. I tested this entire series on a PowerNV machine, including doing EEH injection to trigger PCI hotplug: Tested-by: Daniel Axtens <dja@axtens.net> For completeness, it would be good to test it on Cell, as they are the only remaining user of pci_of_scan.c In conclusion, this patch is Reviewed-by: Daniel Axtens <dja@axtens.net> Regards, Daniel Axtens On Fri, 2015-04-03 at 17:25 +0800, Yijing Wang wrote: > Now we could use pci_scan_host_bridge() to scan > pci buses, provide powerpc specific pci_host_bridge_ops. > > Signed-off-by: Yijing Wang <wangyijing@huawei.com> > CC: Benjamin Herrenschmidt <benh@kernel.crashing.org> > CC: linuxppc-dev@lists.ozlabs.org > --- > arch/powerpc/kernel/pci-common.c | 62 +++++++++++++++++++++++-------------- > 1 files changed, 38 insertions(+), 24 deletions(-) > > diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c > index 2c58200..50b32f6 100644 > --- a/arch/powerpc/kernel/pci-common.c > +++ b/arch/powerpc/kernel/pci-common.c > @@ -773,6 +773,29 @@ void pcibios_set_root_bus_speed(struct pci_host_bridge *bridge) > return ppc_md.pcibios_set_root_bus_speed(bridge); > } > > +static int pci_host_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(hose->dn, bus); > + > + if (mode == PCI_PROBE_NORMAL) { > + pci_bus_update_busn_res_end(bus, 255); > + hose->last_busno = pci_scan_child_bus(bus); > + pci_bus_update_busn_res_end(bus, hose->last_busno); > + } > + > + return pci_bus_child_max_busnr(bus); > +} > + > /* This header fixup will do the resource fixup for all devices as they are > * probed, but not for bridge ranges > */ > @@ -1585,6 +1608,11 @@ struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) > return of_node_get(hose->dn); > } > > +static struct pci_host_bridge_ops pci_host_ops = { > + .set_root_bus_speed = pcibios_set_root_bus_speed, > + .scan_bus = pci_host_scan_bus, > +}; > + > /** > * pci_scan_phb - Given a pci_controller, setup and scan the PCI bus > * @hose: Pointer to the PCI host controller instance structure > @@ -1592,9 +1620,8 @@ struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) > void pcibios_scan_phb(struct pci_controller *hose) > { > LIST_HEAD(resources); > - struct pci_bus *bus; > + struct pci_host_bridge *host; > struct device_node *node = hose->dn; > - int mode; > > pr_debug("PCI: Scanning PHB %s\n", of_node_full_name(node)); > > @@ -1609,30 +1636,17 @@ void pcibios_scan_phb(struct pci_controller *hose) > hose->busn.flags = IORESOURCE_BUS; > pci_add_resource(&resources, &hose->busn); > > + pci_host_ops.pci_ops = hose->ops; > /* Create an empty bus for the toplevel */ > - bus = pci_create_root_bus(hose->parent, hose->global_number, > - hose->first_busno, hose->ops, hose, &resources); > - if (bus == NULL) { > - pr_err("Failed to create bus for PCI domain %04x\n", > - hose->global_number); > + host = pci_scan_host_bridge(hose->parent, hose->global_number, > + hose->first_busno, hose, &resources, &pci_host_ops); > + if (host == NULL) { > + pr_err("Failed to create host bridge for pci%04x:%02x\n", > + hose->global_number, hose->first_busno); > pci_free_resource_list(&resources); > return; > } > - hose->bus = bus; > - > - /* Get probe mode and perform scan */ > - mode = PCI_PROBE_NORMAL; > - if (node && 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(node, bus); > - > - if (mode == PCI_PROBE_NORMAL) { > - pci_bus_update_busn_res_end(bus, 255); > - hose->last_busno = pci_scan_child_bus(bus); > - pci_bus_update_busn_res_end(bus, hose->last_busno); > - } > + hose->bus = host->bus; > > /* Platform gets a chance to do some global fixups before > * we proceed to resource allocation > @@ -1641,9 +1655,9 @@ void pcibios_scan_phb(struct pci_controller *hose) > ppc_md.pcibios_fixup_phb(hose); > > /* Configure PCI Express settings */ > - if (bus && !pci_has_flag(PCI_PROBE_ONLY)) { > + if (host->bus && !pci_has_flag(PCI_PROBE_ONLY)) { > struct pci_bus *child; > - list_for_each_entry(child, &bus->children, node) > + list_for_each_entry(child, &host->bus->children, node) > pcie_bus_configure_settings(child); > } > }
On 2015/4/7 7:35, Daniel Axtens wrote: > I've been looking at this patch series for a while now, and I now > believe it's ready on the PowerPC side. > > I was originally concerned that it would break odd corner cases, > particularly where similar code appears (namely kernel/pci_hotplug.c and > kernel/pci_of_scan.c). However, upon further examination, talking with > Yijing, and some testing, I'm now convinced that it is indeed restricted > to the generic code, and doesn't change behaviour. > > This is both a plus and a minus: because it's currently restricted to > generic code, I'm confident it works, but the down side is that it > doesn't yet simplify our arch-specific complexity. We'll need to do some > more work on our side to reap the full benefits. > > I tested this entire series on a PowerNV machine, including doing EEH > injection to trigger PCI hotplug: > Tested-by: Daniel Axtens <dja@axtens.net> > For completeness, it would be good to test it on Cell, as they are the > only remaining user of pci_of_scan.c > > In conclusion, this patch is > Reviewed-by: Daniel Axtens <dja@axtens.net> > Thanks very much for your test and review. Thanks! Yijing. > > > On Fri, 2015-04-03 at 17:25 +0800, Yijing Wang wrote: >> Now we could use pci_scan_host_bridge() to scan >> pci buses, provide powerpc specific pci_host_bridge_ops. >> >> Signed-off-by: Yijing Wang <wangyijing@huawei.com> >> CC: Benjamin Herrenschmidt <benh@kernel.crashing.org> >> CC: linuxppc-dev@lists.ozlabs.org >> --- >> arch/powerpc/kernel/pci-common.c | 62 +++++++++++++++++++++++-------------- >> 1 files changed, 38 insertions(+), 24 deletions(-) >> >> diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c >> index 2c58200..50b32f6 100644 >> --- a/arch/powerpc/kernel/pci-common.c >> +++ b/arch/powerpc/kernel/pci-common.c >> @@ -773,6 +773,29 @@ void pcibios_set_root_bus_speed(struct pci_host_bridge *bridge) >> return ppc_md.pcibios_set_root_bus_speed(bridge); >> } >> >> +static int pci_host_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(hose->dn, bus); >> + >> + if (mode == PCI_PROBE_NORMAL) { >> + pci_bus_update_busn_res_end(bus, 255); >> + hose->last_busno = pci_scan_child_bus(bus); >> + pci_bus_update_busn_res_end(bus, hose->last_busno); >> + } >> + >> + return pci_bus_child_max_busnr(bus); >> +} >> + >> /* This header fixup will do the resource fixup for all devices as they are >> * probed, but not for bridge ranges >> */ >> @@ -1585,6 +1608,11 @@ struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) >> return of_node_get(hose->dn); >> } >> >> +static struct pci_host_bridge_ops pci_host_ops = { >> + .set_root_bus_speed = pcibios_set_root_bus_speed, >> + .scan_bus = pci_host_scan_bus, >> +}; >> + >> /** >> * pci_scan_phb - Given a pci_controller, setup and scan the PCI bus >> * @hose: Pointer to the PCI host controller instance structure >> @@ -1592,9 +1620,8 @@ struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) >> void pcibios_scan_phb(struct pci_controller *hose) >> { >> LIST_HEAD(resources); >> - struct pci_bus *bus; >> + struct pci_host_bridge *host; >> struct device_node *node = hose->dn; >> - int mode; >> >> pr_debug("PCI: Scanning PHB %s\n", of_node_full_name(node)); >> >> @@ -1609,30 +1636,17 @@ void pcibios_scan_phb(struct pci_controller *hose) >> hose->busn.flags = IORESOURCE_BUS; >> pci_add_resource(&resources, &hose->busn); >> >> + pci_host_ops.pci_ops = hose->ops; >> /* Create an empty bus for the toplevel */ >> - bus = pci_create_root_bus(hose->parent, hose->global_number, >> - hose->first_busno, hose->ops, hose, &resources); >> - if (bus == NULL) { >> - pr_err("Failed to create bus for PCI domain %04x\n", >> - hose->global_number); >> + host = pci_scan_host_bridge(hose->parent, hose->global_number, >> + hose->first_busno, hose, &resources, &pci_host_ops); >> + if (host == NULL) { >> + pr_err("Failed to create host bridge for pci%04x:%02x\n", >> + hose->global_number, hose->first_busno); >> pci_free_resource_list(&resources); >> return; >> } >> - hose->bus = bus; >> - >> - /* Get probe mode and perform scan */ >> - mode = PCI_PROBE_NORMAL; >> - if (node && 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(node, bus); >> - >> - if (mode == PCI_PROBE_NORMAL) { >> - pci_bus_update_busn_res_end(bus, 255); >> - hose->last_busno = pci_scan_child_bus(bus); >> - pci_bus_update_busn_res_end(bus, hose->last_busno); >> - } >> + hose->bus = host->bus; >> >> /* Platform gets a chance to do some global fixups before >> * we proceed to resource allocation >> @@ -1641,9 +1655,9 @@ void pcibios_scan_phb(struct pci_controller *hose) >> ppc_md.pcibios_fixup_phb(hose); >> >> /* Configure PCI Express settings */ >> - if (bus && !pci_has_flag(PCI_PROBE_ONLY)) { >> + if (host->bus && !pci_has_flag(PCI_PROBE_ONLY)) { >> struct pci_bus *child; >> - list_for_each_entry(child, &bus->children, node) >> + list_for_each_entry(child, &host->bus->children, node) >> pcie_bus_configure_settings(child); >> } >> } >
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c index 2c58200..50b32f6 100644 --- a/arch/powerpc/kernel/pci-common.c +++ b/arch/powerpc/kernel/pci-common.c @@ -773,6 +773,29 @@ void pcibios_set_root_bus_speed(struct pci_host_bridge *bridge) return ppc_md.pcibios_set_root_bus_speed(bridge); } +static int pci_host_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(hose->dn, bus); + + if (mode == PCI_PROBE_NORMAL) { + pci_bus_update_busn_res_end(bus, 255); + hose->last_busno = pci_scan_child_bus(bus); + pci_bus_update_busn_res_end(bus, hose->last_busno); + } + + return pci_bus_child_max_busnr(bus); +} + /* This header fixup will do the resource fixup for all devices as they are * probed, but not for bridge ranges */ @@ -1585,6 +1608,11 @@ struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) return of_node_get(hose->dn); } +static struct pci_host_bridge_ops pci_host_ops = { + .set_root_bus_speed = pcibios_set_root_bus_speed, + .scan_bus = pci_host_scan_bus, +}; + /** * pci_scan_phb - Given a pci_controller, setup and scan the PCI bus * @hose: Pointer to the PCI host controller instance structure @@ -1592,9 +1620,8 @@ struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus) void pcibios_scan_phb(struct pci_controller *hose) { LIST_HEAD(resources); - struct pci_bus *bus; + struct pci_host_bridge *host; struct device_node *node = hose->dn; - int mode; pr_debug("PCI: Scanning PHB %s\n", of_node_full_name(node)); @@ -1609,30 +1636,17 @@ void pcibios_scan_phb(struct pci_controller *hose) hose->busn.flags = IORESOURCE_BUS; pci_add_resource(&resources, &hose->busn); + pci_host_ops.pci_ops = hose->ops; /* Create an empty bus for the toplevel */ - bus = pci_create_root_bus(hose->parent, hose->global_number, - hose->first_busno, hose->ops, hose, &resources); - if (bus == NULL) { - pr_err("Failed to create bus for PCI domain %04x\n", - hose->global_number); + host = pci_scan_host_bridge(hose->parent, hose->global_number, + hose->first_busno, hose, &resources, &pci_host_ops); + if (host == NULL) { + pr_err("Failed to create host bridge for pci%04x:%02x\n", + hose->global_number, hose->first_busno); pci_free_resource_list(&resources); return; } - hose->bus = bus; - - /* Get probe mode and perform scan */ - mode = PCI_PROBE_NORMAL; - if (node && 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(node, bus); - - if (mode == PCI_PROBE_NORMAL) { - pci_bus_update_busn_res_end(bus, 255); - hose->last_busno = pci_scan_child_bus(bus); - pci_bus_update_busn_res_end(bus, hose->last_busno); - } + hose->bus = host->bus; /* Platform gets a chance to do some global fixups before * we proceed to resource allocation @@ -1641,9 +1655,9 @@ void pcibios_scan_phb(struct pci_controller *hose) ppc_md.pcibios_fixup_phb(hose); /* Configure PCI Express settings */ - if (bus && !pci_has_flag(PCI_PROBE_ONLY)) { + if (host->bus && !pci_has_flag(PCI_PROBE_ONLY)) { struct pci_bus *child; - list_for_each_entry(child, &bus->children, node) + list_for_each_entry(child, &host->bus->children, node) pcie_bus_configure_settings(child); } }
Now we could use pci_scan_host_bridge() to scan pci buses, provide powerpc specific pci_host_bridge_ops. Signed-off-by: Yijing Wang <wangyijing@huawei.com> CC: Benjamin Herrenschmidt <benh@kernel.crashing.org> CC: linuxppc-dev@lists.ozlabs.org --- arch/powerpc/kernel/pci-common.c | 62 +++++++++++++++++++++++-------------- 1 files changed, 38 insertions(+), 24 deletions(-)