Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 182 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/eeh_sysfs.c b/arch/powerpc/kernel/eeh_sysfs.c
new file mode 100644
index 0000000000..706e1eb95e
--- /dev/null
+++ b/arch/powerpc/kernel/eeh_sysfs.c
@@ -0,0 +1,182 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Sysfs entries for PCI Error Recovery for PAPR-compliant platform.
+ * Copyright IBM Corporation 2007
+ * Copyright Linas Vepstas <linas@austin.ibm.com> 2007
+ *
+ * Send comments and feedback to Linas Vepstas <linas@austin.ibm.com>
+ */
+#include <linux/of.h>
+#include <linux/pci.h>
+#include <linux/stat.h>
+#include <asm/ppc-pci.h>
+#include <asm/pci-bridge.h>
+
+/**
+ * EEH_SHOW_ATTR -- Create sysfs entry for eeh statistic
+ * @_name: name of file in sysfs directory
+ * @_memb: name of member in struct eeh_dev to access
+ * @_format: printf format for display
+ *
+ * All of the attributes look very similar, so just
+ * auto-gen a cut-n-paste routine to display them.
+ */
+#define EEH_SHOW_ATTR(_name,_memb,_format)               \
+static ssize_t eeh_show_##_name(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);      \
+	                                                      \
+	if (!edev)                                            \
+		return 0;                                     \
+	                                                      \
+	return sprintf(buf, _format "\n", edev->_memb);       \
+}                                                        \
+static DEVICE_ATTR(_name, 0444, eeh_show_##_name, NULL);
+
+EEH_SHOW_ATTR(eeh_mode,            mode,            "0x%x");
+EEH_SHOW_ATTR(eeh_pe_config_addr,  pe_config_addr,  "0x%x");
+
+static ssize_t eeh_pe_state_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);
+	int state;
+
+	if (!edev || !edev->pe)
+		return -ENODEV;
+
+	state = eeh_ops->get_state(edev->pe, NULL);
+	return sprintf(buf, "0x%08x 0x%08x\n",
+		       state, edev->pe->state);
+}
+
+static ssize_t eeh_pe_state_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)
+		return -ENODEV;
+
+	/* Nothing to do if it's not frozen */
+	if (!(edev->pe->state & EEH_PE_ISOLATED))
+		return count;
+
+	if (eeh_unfreeze_pe(edev->pe))
+		return -EIO;
+	eeh_pe_state_clear(edev->pe, EEH_PE_ISOLATED, true);
+
+	return count;
+}
+
+static DEVICE_ATTR_RW(eeh_pe_state);
+
+#if defined(CONFIG_PCI_IOV) && defined(CONFIG_PPC_PSERIES)
+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;
+
+	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(edev))
+		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 && CONFIG PPC_PSERIES*/
+
+void eeh_sysfs_add_device(struct pci_dev *pdev)
+{
+	struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
+	int rc=0;
+
+	if (!eeh_enabled())
+		return;
+
+	if (edev && (edev->mode & EEH_DEV_SYSFS))
+		return;
+
+	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");
+	else if (edev)
+		edev->mode |= EEH_DEV_SYSFS;
+}
+
+void eeh_sysfs_remove_device(struct pci_dev *pdev)
+{
+	struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
+
+	if (!edev) {
+		WARN_ON(eeh_enabled());
+		return;
+	}
+
+	edev->mode &= ~EEH_DEV_SYSFS;
+
+	/*
+	 * The parent directory might have been removed. We needn't
+	 * continue for that case.
+	 */
+	if (!pdev->dev.kobj.sd)
+		return;
+
+	device_remove_file(&pdev->dev, &dev_attr_eeh_mode);
+	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);
+}