powerpc/eeh: Add EEH notify resume sysfs

Introduce a method for notify resume to be called from sysfs. In this
patch one can now call notify resume from sysfs when is supported by
platform.

Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Signed-off-by: Juan J. Alvarez <jjalvare@linux.vnet.ibm.com>
Acked-by: Russell Currey <ruscur@russell.cc>
[mpe: Add NULL check, add empty versions to avoid #ifdefs]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/eeh_sysfs.c b/arch/powerpc/kernel/eeh_sysfs.c
index 2fb6a2d0946137c5a29720db05bbd2d458c10f58..deed906dd8f1200e55e3d3ef65d48b37ec9dfb20 100644 (file)
--- a/arch/powerpc/kernel/eeh_sysfs.c
+++ b/arch/powerpc/kernel/eeh_sysfs.c
@@ -90,6 +90,65 @@ static ssize_t eeh_pe_state_store(struct device *dev,
 
 static DEVICE_ATTR_RW(eeh_pe_state);
 
+#ifdef CONFIG_PCI_IOV
+static ssize_t eeh_notify_resume_show(struct device *dev,
+                                     struct device_attribute *attr, char *buf)
+{
+       struct pci_dev *pdev = to_pci_dev(dev);
+       struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
+       struct pci_dn *pdn = pci_get_pdn(pdev);
+
+       if (!edev || !edev->pe)
+               return -ENODEV;
+
+       pdn = pci_get_pdn(pdev);
+       return sprintf(buf, "%d\n", pdn->last_allow_rc);
+}
+
+static ssize_t eeh_notify_resume_store(struct device *dev,
+                                      struct device_attribute *attr,
+                                      const char *buf, size_t count)
+{
+       struct pci_dev *pdev = to_pci_dev(dev);
+       struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
+
+       if (!edev || !edev->pe || !eeh_ops->notify_resume)
+               return -ENODEV;
+
+       if (eeh_ops->notify_resume(pci_get_pdn(pdev)))
+               return -EIO;
+
+       return count;
+}
+static DEVICE_ATTR_RW(eeh_notify_resume);
+
+static int eeh_notify_resume_add(struct pci_dev *pdev)
+{
+       struct device_node *np;
+       int rc = 0;
+
+       np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn);
+
+       if (of_property_read_bool(np, "ibm,is-open-sriov-pf"))
+               rc = device_create_file(&pdev->dev, &dev_attr_eeh_notify_resume);
+
+       return rc;
+}
+
+static void eeh_notify_resume_remove(struct pci_dev *pdev)
+{
+       struct device_node *np;
+
+       np = pci_device_to_OF_node(pdev->is_physfn ? pdev : pdev->physfn);
+
+       if (of_property_read_bool(np, "ibm,is-open-sriov-pf"))
+               device_remove_file(&pdev->dev, &dev_attr_eeh_notify_resume);
+}
+#else
+static inline int eeh_notify_resume_add(struct pci_dev *pdev) { return 0; }
+static inline void eeh_notify_resume_remove(struct pci_dev *pdev) { }
+#endif /* CONFIG_PCI_IOV */
+
 void eeh_sysfs_add_device(struct pci_dev *pdev)
 {
        struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
@@ -104,6 +163,7 @@ void eeh_sysfs_add_device(struct pci_dev *pdev)
        rc += device_create_file(&pdev->dev, &dev_attr_eeh_mode);
        rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
        rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state);
+       rc += eeh_notify_resume_add(pdev);
 
        if (rc)
                pr_warn("EEH: Unable to create sysfs entries\n");
@@ -129,6 +189,8 @@ void eeh_sysfs_remove_device(struct pci_dev *pdev)
        device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
        device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state);
 
+       eeh_notify_resume_remove(pdev);
+
        if (edev)
                edev->mode &= ~EEH_DEV_SYSFS;
 }