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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>
This commit is contained in:
Bryant G. Ly 2018-01-05 10:45:50 -06:00 committed by Michael Ellerman
parent 67923cfcfa
commit 6ea3df6931
1 changed files with 62 additions and 0 deletions
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62
arch/powerpc/kernel/eeh_sysfs.c
View File

@ -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;
}