| Message ID | 1430204499-19571-6-git-send-email-wangyijing@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
Hi Yijing, On 4/28/2015 12:01 AM, Yijing Wang wrote: > Pci_bus_add_devices() was ripped out of pci_scan_root_bus(). > Now pci_scan_root_bus() == pci_create_root_bus() + > pci_scan_child_bus() if busn resource is supplied. > iproc added the busn resource to resources list > in of_pci_get_host_bridge_resources(). So it should be safe > to use pci_scan_root_bus() instead. > > Signed-off-by: Yijing Wang <wangyijing@huawei.com> > CC: Ray Jui <rjui@broadcom.com> > --- > drivers/pci/host/pcie-iproc.c | 5 ++--- > 1 files changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c > index 329e1b5..9622ebf 100644 > --- a/drivers/pci/host/pcie-iproc.c > +++ b/drivers/pci/host/pcie-iproc.c > @@ -210,10 +210,10 @@ int iproc_pcie_setup(struct iproc_pcie *pcie) > > pcie->sysdata.private_data = pcie; > > - bus = pci_create_root_bus(pcie->dev, 0, &iproc_pcie_ops, > + bus = pci_scan_root_bus(pcie->dev, 0, &iproc_pcie_ops, > &pcie->sysdata, pcie->resources); > if (!bus) { > - dev_err(pcie->dev, "unable to create PCI root bus\n"); > + dev_err(pcie->dev, "unable to scan PCI root bus\n"); > ret = -ENOMEM; > goto err_power_off_phy; > } iproc_pcie_check_link is called here by using the 'bus' structure returned from pci_create_root_bus. In iproc_pcie_check_link, we configure root bus class to PCI_CLASS_BRIDGE_PCI and validate to ensure a stable link between RC and EP can be detected. > @@ -227,7 +227,6 @@ int iproc_pcie_setup(struct iproc_pcie *pcie) > > iproc_pcie_enable(pcie); Here we enable INTx support for our RC controller. > > - pci_scan_child_bus(bus); Here, if pci_scan_child_bus is moved to before iproc_pcie_check_link, I don't think it would work (although I have not tested this). An alternative is to use a dummy bus structure to feed into iproc_pcie_check_link, and call iproc_pcie_check_link and iproc_pcie_enable before pci_scan_root_bus. But the reason I put the link check code in between pci_create_root_bus and pci_scan_child_bus was to avoid using a dummy bus structure, :) > pci_assign_unassigned_bus_resources(bus); > pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci); > pci_bus_add_devices(bus); > Thanks, Ray -- 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
>> @@ -210,10 +210,10 @@ int iproc_pcie_setup(struct iproc_pcie *pcie) >> >> pcie->sysdata.private_data = pcie; >> >> - bus = pci_create_root_bus(pcie->dev, 0, &iproc_pcie_ops, >> + bus = pci_scan_root_bus(pcie->dev, 0, &iproc_pcie_ops, >> &pcie->sysdata, pcie->resources); >> if (!bus) { >> - dev_err(pcie->dev, "unable to create PCI root bus\n"); >> + dev_err(pcie->dev, "unable to scan PCI root bus\n"); >> ret = -ENOMEM; >> goto err_power_off_phy; >> } > > iproc_pcie_check_link is called here by using the 'bus' structure > returned from pci_create_root_bus. In iproc_pcie_check_link, we > configure root bus class to PCI_CLASS_BRIDGE_PCI and validate to ensure > a stable link between RC and EP can be detected. Oh, I got it. Thanks for your explanation. > >> @@ -227,7 +227,6 @@ int iproc_pcie_setup(struct iproc_pcie *pcie) >> >> iproc_pcie_enable(pcie); > > Here we enable INTx support for our RC controller. > >> >> - pci_scan_child_bus(bus); > > Here, if pci_scan_child_bus is moved to before iproc_pcie_check_link, I > don't think it would work (although I have not tested this). > > An alternative is to use a dummy bus structure to feed into > iproc_pcie_check_link, and call iproc_pcie_check_link and > iproc_pcie_enable before pci_scan_root_bus. But the reason I put the > link check code in between pci_create_root_bus and pci_scan_child_bus > was to avoid using a dummy bus structure, :) Maybe we could refactor this by add a new pci_host_bridge_ops in the later patch. > >> pci_assign_unassigned_bus_resources(bus); >> pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci); >> pci_bus_add_devices(bus); >> > > Thanks, > > Ray > > . >
Hi Bjorn, please ignore this patch, it's not correct. I prefer to refactor it by add a new pci_host_bridge_ops in later patch. What do you think about the prior four patches ? I hope they could be merged first, they are independent. Thanks! Yijing. On 2015/4/28 15:01, Yijing Wang wrote: > Pci_bus_add_devices() was ripped out of pci_scan_root_bus(). > Now pci_scan_root_bus() == pci_create_root_bus() + > pci_scan_child_bus() if busn resource is supplied. > iproc added the busn resource to resources list > in of_pci_get_host_bridge_resources(). So it should be safe > to use pci_scan_root_bus() instead. > > Signed-off-by: Yijing Wang <wangyijing@huawei.com> > CC: Ray Jui <rjui@broadcom.com> > --- > drivers/pci/host/pcie-iproc.c | 5 ++--- > 1 files changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c > index 329e1b5..9622ebf 100644 > --- a/drivers/pci/host/pcie-iproc.c > +++ b/drivers/pci/host/pcie-iproc.c > @@ -210,10 +210,10 @@ int iproc_pcie_setup(struct iproc_pcie *pcie) > > pcie->sysdata.private_data = pcie; > > - bus = pci_create_root_bus(pcie->dev, 0, &iproc_pcie_ops, > + bus = pci_scan_root_bus(pcie->dev, 0, &iproc_pcie_ops, > &pcie->sysdata, pcie->resources); > if (!bus) { > - dev_err(pcie->dev, "unable to create PCI root bus\n"); > + dev_err(pcie->dev, "unable to scan PCI root bus\n"); > ret = -ENOMEM; > goto err_power_off_phy; > } > @@ -227,7 +227,6 @@ int iproc_pcie_setup(struct iproc_pcie *pcie) > > iproc_pcie_enable(pcie); > > - pci_scan_child_bus(bus); > pci_assign_unassigned_bus_resources(bus); > pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci); > pci_bus_add_devices(bus); >
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c index 329e1b5..9622ebf 100644 --- a/drivers/pci/host/pcie-iproc.c +++ b/drivers/pci/host/pcie-iproc.c @@ -210,10 +210,10 @@ int iproc_pcie_setup(struct iproc_pcie *pcie) pcie->sysdata.private_data = pcie; - bus = pci_create_root_bus(pcie->dev, 0, &iproc_pcie_ops, + bus = pci_scan_root_bus(pcie->dev, 0, &iproc_pcie_ops, &pcie->sysdata, pcie->resources); if (!bus) { - dev_err(pcie->dev, "unable to create PCI root bus\n"); + dev_err(pcie->dev, "unable to scan PCI root bus\n"); ret = -ENOMEM; goto err_power_off_phy; } @@ -227,7 +227,6 @@ int iproc_pcie_setup(struct iproc_pcie *pcie) iproc_pcie_enable(pcie); - pci_scan_child_bus(bus); pci_assign_unassigned_bus_resources(bus); pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci); pci_bus_add_devices(bus);
Pci_bus_add_devices() was ripped out of pci_scan_root_bus(). Now pci_scan_root_bus() == pci_create_root_bus() + pci_scan_child_bus() if busn resource is supplied. iproc added the busn resource to resources list in of_pci_get_host_bridge_resources(). So it should be safe to use pci_scan_root_bus() instead. Signed-off-by: Yijing Wang <wangyijing@huawei.com> CC: Ray Jui <rjui@broadcom.com> --- drivers/pci/host/pcie-iproc.c | 5 ++--- 1 files changed, 2 insertions(+), 3 deletions(-)