| Message ID | 1350371420-7888-3-git-send-email-wangyijing@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
[+cc Kenji] On Tue, Oct 16, 2012 at 1:10 AM, Yijing Wang <wangyijing@huawei.com> wrote: > ARI device supports up to 256 Functions, pciehp now only scan and configure > Functions from 0 to 7, this patch fix this problem for ARI device hotplug. > > Signed-off-by: Yijing Wang <wangyijing@huawei.com> > --- > drivers/pci/hotplug/pciehp_pci.c | 40 ++++++++++++++++++++++++++----------- > 1 files changed, 28 insertions(+), 12 deletions(-) > > diff --git a/drivers/pci/hotplug/pciehp_pci.c b/drivers/pci/hotplug/pciehp_pci.c > index 09cecaf..b37e8a0 100644 > --- a/drivers/pci/hotplug/pciehp_pci.c > +++ b/drivers/pci/hotplug/pciehp_pci.c > @@ -39,7 +39,7 @@ int pciehp_configure_device(struct slot *p_slot) > struct pci_dev *dev; > struct pci_dev *bridge = p_slot->ctrl->pcie->port; > struct pci_bus *parent = bridge->subordinate; > - int num, fn; > + int num, fn = 0; > struct controller *ctrl = p_slot->ctrl; > > dev = pci_get_slot(parent, PCI_DEVFN(0, 0)); > @@ -56,21 +56,31 @@ int pciehp_configure_device(struct slot *p_slot) > ctrl_err(ctrl, "No new device found\n"); > return -ENODEV; > } > - > - for (fn = 0; fn < 8; fn++) { > - dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); > + > + do { > + if (pci_ari_enabled(parent)) > + dev = pci_get_slot(parent, fn); > + else > + dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); > + > + fn = pci_next_fn(parent, PCI_DEVFN(0, fn)); This doesn't make sense to me. We just called pci_scan_slot(), which already used pci_next_fn() to find all the functions. We shouldn't have to have the ARI knowledge and pci_next_fn() looping here again (and yet again after pci_assign_unassigned_bridge_resources()). According to the pci_scan_slot() function comment, all the newly-discovered devices should be on the bus->devices list. And in fact, the similar code in acpiphp (enable_device()) *does* use the bus->devices list. I think cpci_configure_slot(), pciehp_configure_device(), enable_slot() in sgi_hotplug.c, and shpchp_configure_device() should be changed to use the bus->devices list. In addition, I think the refcount management (pci_get_slot()/pci_dev_put()) should be removed. > if (!dev) > continue; > if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) || > (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) > pci_hp_add_bridge(dev); > pci_dev_put(dev); > - } > + } while (fn); > > pci_assign_unassigned_bridge_resources(bridge); > > - for (fn = 0; fn < 8; fn++) { > - dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); > + do { > + if (pci_ari_enabled(parent)) > + dev = pci_get_slot(parent, fn); > + else > + dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); > + > + fn = pci_next_fn(parent, PCI_DEVFN(0, fn)); > if (!dev) > continue; > if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) { > @@ -79,7 +89,7 @@ int pciehp_configure_device(struct slot *p_slot) > } > pci_configure_slot(dev); > pci_dev_put(dev); > - } > + } while (fn); > > pci_bus_add_devices(parent); > > @@ -89,21 +99,27 @@ int pciehp_configure_device(struct slot *p_slot) > int pciehp_unconfigure_device(struct slot *p_slot) > { > int ret, rc = 0; > - int j; > + int fn = 0; > u8 bctl = 0; > u8 presence = 0; > struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate; > u16 command; > struct controller *ctrl = p_slot->ctrl; > + struct pci_dev *temp; > > ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n", > __func__, pci_domain_nr(parent), parent->number); > ret = pciehp_get_adapter_status(p_slot, &presence); > if (ret) > presence = 0; > + > + do { > + if (pci_ari_enabled(parent)) > + temp = pci_get_slot(parent, fn); > + else > + temp = pci_get_slot(parent, PCI_DEVFN(0, fn)); > > - for (j = 0; j < 8; j++) { > - struct pci_dev *temp = pci_get_slot(parent, PCI_DEVFN(0, j)); > + fn = pci_next_fn(parent, PCI_DEVFN(0, fn)); > if (!temp) > continue; > if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) { > @@ -129,7 +145,7 @@ int pciehp_unconfigure_device(struct slot *p_slot) > pci_write_config_word(temp, PCI_COMMAND, command); > } > pci_dev_put(temp); > - } > + } while (fn); > > return rc; > } > -- > 1.7.1 > > -- 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 2013/1/9 1:44, Bjorn Helgaas wrote: > [+cc Kenji] > > On Tue, Oct 16, 2012 at 1:10 AM, Yijing Wang <wangyijing@huawei.com> wrote: >> ARI device supports up to 256 Functions, pciehp now only scan and configure >> Functions from 0 to 7, this patch fix this problem for ARI device hotplug. >> >> Signed-off-by: Yijing Wang <wangyijing@huawei.com> >> --- >> drivers/pci/hotplug/pciehp_pci.c | 40 ++++++++++++++++++++++++++----------- >> 1 files changed, 28 insertions(+), 12 deletions(-) >> >> diff --git a/drivers/pci/hotplug/pciehp_pci.c b/drivers/pci/hotplug/pciehp_pci.c >> index 09cecaf..b37e8a0 100644 >> --- a/drivers/pci/hotplug/pciehp_pci.c >> +++ b/drivers/pci/hotplug/pciehp_pci.c >> @@ -39,7 +39,7 @@ int pciehp_configure_device(struct slot *p_slot) >> struct pci_dev *dev; >> struct pci_dev *bridge = p_slot->ctrl->pcie->port; >> struct pci_bus *parent = bridge->subordinate; >> - int num, fn; >> + int num, fn = 0; >> struct controller *ctrl = p_slot->ctrl; >> >> dev = pci_get_slot(parent, PCI_DEVFN(0, 0)); >> @@ -56,21 +56,31 @@ int pciehp_configure_device(struct slot *p_slot) >> ctrl_err(ctrl, "No new device found\n"); >> return -ENODEV; >> } >> - >> - for (fn = 0; fn < 8; fn++) { >> - dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); >> + >> + do { >> + if (pci_ari_enabled(parent)) >> + dev = pci_get_slot(parent, fn); >> + else >> + dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); >> + >> + fn = pci_next_fn(parent, PCI_DEVFN(0, fn)); > > This doesn't make sense to me. We just called pci_scan_slot(), which > already used pci_next_fn() to find all the functions. We shouldn't > have to have the ARI knowledge and pci_next_fn() looping here again > (and yet again after pci_assign_unassigned_bridge_resources()). > > According to the pci_scan_slot() function comment, all the > newly-discovered devices should be on the bus->devices list. And in > fact, the similar code in acpiphp (enable_device()) *does* use the > bus->devices list. > Hi Bjorn, Thanks for your review and comment! You are right, use bus->devices list is a better solution. I will update my ARI device hotplug support patchset and send out again. > I think cpci_configure_slot(), pciehp_configure_device(), > enable_slot() in sgi_hotplug.c, and shpchp_configure_device() should > be changed to use the bus->devices list. In addition, I think the > refcount management (pci_get_slot()/pci_dev_put()) should be removed. Remove pci_get_slot()/pci_dev_put() here looks good to me, Because refcount increment when pci_scan_slot, here remove the refcount management is safe. I will change this and test in my machine, and send out this patch if test result is ok. Thanks very much! Yijing. > >> if (!dev) >> continue; >> if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) || >> (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) >> pci_hp_add_bridge(dev); >> pci_dev_put(dev); >> - } >> + } while (fn); >> >> pci_assign_unassigned_bridge_resources(bridge); >> >> - for (fn = 0; fn < 8; fn++) { >> - dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); >> + do { >> + if (pci_ari_enabled(parent)) >> + dev = pci_get_slot(parent, fn); >> + else >> + dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); >> + >> + fn = pci_next_fn(parent, PCI_DEVFN(0, fn)); >> if (!dev) >> continue; >> if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) { >> @@ -79,7 +89,7 @@ int pciehp_configure_device(struct slot *p_slot) >> } >> pci_configure_slot(dev); >> pci_dev_put(dev); >> - } >> + } while (fn); >> >> pci_bus_add_devices(parent); >> >> @@ -89,21 +99,27 @@ int pciehp_configure_device(struct slot *p_slot) >> int pciehp_unconfigure_device(struct slot *p_slot) >> { >> int ret, rc = 0; >> - int j; >> + int fn = 0; >> u8 bctl = 0; >> u8 presence = 0; >> struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate; >> u16 command; >> struct controller *ctrl = p_slot->ctrl; >> + struct pci_dev *temp; >> >> ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n", >> __func__, pci_domain_nr(parent), parent->number); >> ret = pciehp_get_adapter_status(p_slot, &presence); >> if (ret) >> presence = 0; >> + >> + do { >> + if (pci_ari_enabled(parent)) >> + temp = pci_get_slot(parent, fn); >> + else >> + temp = pci_get_slot(parent, PCI_DEVFN(0, fn)); >> >> - for (j = 0; j < 8; j++) { >> - struct pci_dev *temp = pci_get_slot(parent, PCI_DEVFN(0, j)); >> + fn = pci_next_fn(parent, PCI_DEVFN(0, fn)); >> if (!temp) >> continue; >> if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) { >> @@ -129,7 +145,7 @@ int pciehp_unconfigure_device(struct slot *p_slot) >> pci_write_config_word(temp, PCI_COMMAND, command); >> } >> pci_dev_put(temp); >> - } >> + } while (fn); >> >> return rc; >> } >> -- >> 1.7.1 >> >> > > . >
diff --git a/drivers/pci/hotplug/pciehp_pci.c b/drivers/pci/hotplug/pciehp_pci.c index 09cecaf..b37e8a0 100644 --- a/drivers/pci/hotplug/pciehp_pci.c +++ b/drivers/pci/hotplug/pciehp_pci.c @@ -39,7 +39,7 @@ int pciehp_configure_device(struct slot *p_slot) struct pci_dev *dev; struct pci_dev *bridge = p_slot->ctrl->pcie->port; struct pci_bus *parent = bridge->subordinate; - int num, fn; + int num, fn = 0; struct controller *ctrl = p_slot->ctrl; dev = pci_get_slot(parent, PCI_DEVFN(0, 0)); @@ -56,21 +56,31 @@ int pciehp_configure_device(struct slot *p_slot) ctrl_err(ctrl, "No new device found\n"); return -ENODEV; } - - for (fn = 0; fn < 8; fn++) { - dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); + + do { + if (pci_ari_enabled(parent)) + dev = pci_get_slot(parent, fn); + else + dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); + + fn = pci_next_fn(parent, PCI_DEVFN(0, fn)); if (!dev) continue; if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) || (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) pci_hp_add_bridge(dev); pci_dev_put(dev); - } + } while (fn); pci_assign_unassigned_bridge_resources(bridge); - for (fn = 0; fn < 8; fn++) { - dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); + do { + if (pci_ari_enabled(parent)) + dev = pci_get_slot(parent, fn); + else + dev = pci_get_slot(parent, PCI_DEVFN(0, fn)); + + fn = pci_next_fn(parent, PCI_DEVFN(0, fn)); if (!dev) continue; if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) { @@ -79,7 +89,7 @@ int pciehp_configure_device(struct slot *p_slot) } pci_configure_slot(dev); pci_dev_put(dev); - } + } while (fn); pci_bus_add_devices(parent); @@ -89,21 +99,27 @@ int pciehp_configure_device(struct slot *p_slot) int pciehp_unconfigure_device(struct slot *p_slot) { int ret, rc = 0; - int j; + int fn = 0; u8 bctl = 0; u8 presence = 0; struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate; u16 command; struct controller *ctrl = p_slot->ctrl; + struct pci_dev *temp; ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n", __func__, pci_domain_nr(parent), parent->number); ret = pciehp_get_adapter_status(p_slot, &presence); if (ret) presence = 0; + + do { + if (pci_ari_enabled(parent)) + temp = pci_get_slot(parent, fn); + else + temp = pci_get_slot(parent, PCI_DEVFN(0, fn)); - for (j = 0; j < 8; j++) { - struct pci_dev *temp = pci_get_slot(parent, PCI_DEVFN(0, j)); + fn = pci_next_fn(parent, PCI_DEVFN(0, fn)); if (!temp) continue; if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) { @@ -129,7 +145,7 @@ int pciehp_unconfigure_device(struct slot *p_slot) pci_write_config_word(temp, PCI_COMMAND, command); } pci_dev_put(temp); - } + } while (fn); return rc; }
ARI device supports up to 256 Functions, pciehp now only scan and configure Functions from 0 to 7, this patch fix this problem for ARI device hotplug. Signed-off-by: Yijing Wang <wangyijing@huawei.com> --- drivers/pci/hotplug/pciehp_pci.c | 40 ++++++++++++++++++++++++++----------- 1 files changed, 28 insertions(+), 12 deletions(-)