Initial import

1 files changed, 137 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/eeh_sysfs.c b/arch/powerpc/kernel/eeh_sysfs.c
new file mode 100644
index 000000000..1ceecdda8
--- /dev/null
+++ b/arch/powerpc/kernel/eeh_sysfs.c
@@ -0,0 +1,137 @@
+/*
+ * Sysfs entries for PCI Error Recovery for PAPR-compliant platform.
+ * Copyright IBM Corporation 2007
+ * Copyright Linas Vepstas <linas@austin.ibm.com> 2007
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Send comments and feedback to Linas Vepstas <linas@austin.ibm.com>
+ */
+#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 pci_dn 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, S_IRUGO, eeh_show_##_name, NULL);
+
+EEH_SHOW_ATTR(eeh_mode,            mode,            "0x%x");
+EEH_SHOW_ATTR(eeh_config_addr,     config_addr,     "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, true))
+		return -EIO;
+
+	return count;
+}
+
+static DEVICE_ATTR_RW(eeh_pe_state);
+
+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_config_addr);
+	rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
+	rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_state);
+
+	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);
+
+	/*
+	 * The parent directory might have been removed. We needn't
+	 * continue for that case.
+	 */
+	if (!pdev->dev.kobj.sd) {
+		if (edev)
+			edev->mode &= ~EEH_DEV_SYSFS;
+		return;
+	}
+
+	device_remove_file(&pdev->dev, &dev_attr_eeh_mode);
+	device_remove_file(&pdev->dev, &dev_attr_eeh_config_addr);
+	device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
+	device_remove_file(&pdev->dev, &dev_attr_eeh_pe_state);
+
+	if (edev)
+		edev->mode &= ~EEH_DEV_SYSFS;
+}