On Fri, Oct 30, 2015 at 02:33:49PM +1100, Alexey Kardashevskiy wrote:
>On 10/26/2015 02:15 PM, Wei Yang wrote:
>>VFs and their corresponding pci_dn instances are created and released
>>dynamically as their PF's SRIOV capability is enabled and disabled.
>>The patch creates and releases EEH devices for VFs when creating and
>>releasing their pci_dn instances, which means EEH devices and pci_dn
>>instances have same life cycle. Also, VF's EEH device is identified
>>by (struct eeh_dev::physfn).
>
>
>The add_dev_pci_data() helper (the one you hack) does not create pci_dn
>instances. The add_one_dev_pci_data() helper does.
>
Yes, you are right. The patch here create edev after the pci_dn is created.
So which part in the log you think is not accurate?
>
>>
>>[gwshan: changelog and removed CONFIG_PCI_IOV]
>>Signed-off-by: Wei Yang <weiy...@linux.vnet.ibm.com>
>>Acked-by: Gavin Shan <gws...@linux.vnet.ibm.com>
>>---
>> arch/powerpc/include/asm/eeh.h | 1 +
>> arch/powerpc/kernel/pci_dn.c | 12 ++++++++++++
>> 2 files changed, 13 insertions(+)
>>
>>diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
>>index c5eb86f..6c383ad 100644
>>--- a/arch/powerpc/include/asm/eeh.h
>>+++ b/arch/powerpc/include/asm/eeh.h
>>@@ -140,6 +140,7 @@ struct eeh_dev {
>> struct pci_controller *phb; /* Associated PHB */
>> struct pci_dn *pdn; /* Associated PCI device node */
>> struct pci_dev *pdev; /* Associated PCI device */
>>+ struct pci_dev *physfn; /* Associated PF PORT */
>> struct pci_bus *bus; /* PCI bus for partial hotplug */
>> };
>>
>>diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c
>>index f771130..f0ddde7 100644
>>--- a/arch/powerpc/kernel/pci_dn.c
>>+++ b/arch/powerpc/kernel/pci_dn.c
>>@@ -180,7 +180,9 @@ static struct pci_dn *add_one_dev_pci_data(struct pci_dn
>>*parent,
>> struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
>> {
>> #ifdef CONFIG_PCI_IOV
>>+ struct pci_controller *hose = pci_bus_to_host(pdev->bus);
>> struct pci_dn *parent, *pdn;
>>+ struct eeh_dev *edev;
>> int i;
>>
>> /* Only support IOV for now */
>>@@ -206,6 +208,9 @@ struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
>> __func__, i);
>> return NULL;
>> }
>>+ eeh_dev_init(pdn, hose);
>>+ edev = pdn_to_eeh_dev(pdn);
>
>
>In theory, pdn_to_eeh_dev() can return NULL. In this patch, it is not clear
>if pdn->edev gets initialized before or after add_dev_pci_data().
>
Yep, the return value should be checked.
pdn->edev is initialized in eeh_dev_init() which is called in
add_dev_pci_data(). The order is not clear?
>
>
>>+ edev->physfn = pdev;
>> }
>> #endif /* CONFIG_PCI_IOV */
>>
>>@@ -254,10 +259,17 @@ void remove_dev_pci_data(struct pci_dev *pdev)
>> for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
>> list_for_each_entry_safe(pdn, tmp,
>> &parent->child_list, list) {
>>+ struct eeh_dev *edev;
>> if (pdn->busno != pci_iov_virtfn_bus(pdev, i) ||
>> pdn->devfn != pci_iov_virtfn_devfn(pdev, i))
>> continue;
>>
>>+ edev = pdn_to_eeh_dev(pdn);
>>+ if (edev) {
>>+ pdn->edev = NULL;
>>+ kfree(edev);
>>+ }
>>+
>> if (!list_empty(&pdn->list))
>> list_del(&pdn->list);
>>
>>
>
>
>--
>Alexey
>--
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--
Richard Yang
Help you, Help me
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