2 * The file intends to implement the platform dependent EEH operations on
3 * powernv platform. Actually, the powernv was created in order to fully
6 * Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2013.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
14 #include <linux/atomic.h>
15 #include <linux/delay.h>
16 #include <linux/export.h>
17 #include <linux/init.h>
18 #include <linux/list.h>
19 #include <linux/msi.h>
21 #include <linux/pci.h>
22 #include <linux/proc_fs.h>
23 #include <linux/rbtree.h>
24 #include <linux/sched.h>
25 #include <linux/seq_file.h>
26 #include <linux/spinlock.h>
29 #include <asm/eeh_event.h>
30 #include <asm/firmware.h>
32 #include <asm/iommu.h>
33 #include <asm/machdep.h>
34 #include <asm/msi_bitmap.h>
36 #include <asm/ppc-pci.h>
42 * powernv_eeh_init - EEH platform dependent initialization
44 * EEH platform dependent initialization on powernv
46 static int powernv_eeh_init(void)
48 /* We require OPALv3 */
49 if (!firmware_has_feature(FW_FEATURE_OPALv3)) {
50 pr_warning("%s: OPALv3 is required !\n", __func__);
54 /* Set EEH probe mode */
55 eeh_probe_mode_set(EEH_PROBE_MODE_DEV);
61 * powernv_eeh_post_init - EEH platform dependent post initialization
63 * EEH platform dependent post initialization on powernv. When
64 * the function is called, the EEH PEs and devices should have
65 * been built. If the I/O cache staff has been built, EEH is
66 * ready to supply service.
68 static int powernv_eeh_post_init(void)
70 struct pci_controller *hose;
74 list_for_each_entry(hose, &hose_list, list_node) {
75 phb = hose->private_data;
77 if (phb->eeh_ops && phb->eeh_ops->post_init) {
78 ret = phb->eeh_ops->post_init(hose);
88 * powernv_eeh_dev_probe - Do probe on PCI device
92 * When EEH module is installed during system boot, all PCI devices
93 * are checked one by one to see if it supports EEH. The function
94 * is introduced for the purpose. By default, EEH has been enabled
95 * on all PCI devices. That's to say, we only need do necessary
96 * initialization on the corresponding eeh device and create PE
99 * It's notable that's unsafe to retrieve the EEH device through
100 * the corresponding PCI device. During the PCI device hotplug, which
101 * was possiblly triggered by EEH core, the binding between EEH device
102 * and the PCI device isn't built yet.
104 static int powernv_eeh_dev_probe(struct pci_dev *dev, void *flag)
106 struct pci_controller *hose = pci_bus_to_host(dev->bus);
107 struct pnv_phb *phb = hose->private_data;
108 struct device_node *dn = pci_device_to_OF_node(dev);
109 struct eeh_dev *edev = of_node_to_eeh_dev(dn);
112 * When probing the root bridge, which doesn't have any
113 * subordinate PCI devices. We don't have OF node for
114 * the root bridge. So it's not reasonable to continue
120 /* Skip for PCI-ISA bridge */
121 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_ISA)
124 /* Initialize eeh device */
125 edev->class_code = dev->class;
127 edev->config_addr = ((dev->bus->number << 8) | dev->devfn);
128 edev->pe_config_addr = phb->bdfn_to_pe(phb, dev->bus, dev->devfn & 0xff);
131 eeh_add_to_parent_pe(edev);
134 * Enable EEH explicitly so that we will do EEH check
135 * while accessing I/O stuff
137 * FIXME: Enable that for PHB3 later
139 if (phb->type == PNV_PHB_IODA1)
140 eeh_subsystem_enabled = 1;
142 /* Save memory bars */
149 * powernv_eeh_set_option - Initialize EEH or MMIO/DMA reenable
151 * @option: operation to be issued
153 * The function is used to control the EEH functionality globally.
154 * Currently, following options are support according to PAPR:
155 * Enable EEH, Disable EEH, Enable MMIO and Enable DMA
157 static int powernv_eeh_set_option(struct eeh_pe *pe, int option)
159 struct pci_controller *hose = pe->phb;
160 struct pnv_phb *phb = hose->private_data;
164 * What we need do is pass it down for hardware
165 * implementation to handle it.
167 if (phb->eeh_ops && phb->eeh_ops->set_option)
168 ret = phb->eeh_ops->set_option(pe, option);
174 * powernv_eeh_get_pe_addr - Retrieve PE address
177 * Retrieve the PE address according to the given tranditional
178 * PCI BDF (Bus/Device/Function) address.
180 static int powernv_eeh_get_pe_addr(struct eeh_pe *pe)
186 * powernv_eeh_get_state - Retrieve PE state
188 * @delay: delay while PE state is temporarily unavailable
190 * Retrieve the state of the specified PE. For IODA-compitable
191 * platform, it should be retrieved from IODA table. Therefore,
192 * we prefer passing down to hardware implementation to handle
195 static int powernv_eeh_get_state(struct eeh_pe *pe, int *delay)
197 struct pci_controller *hose = pe->phb;
198 struct pnv_phb *phb = hose->private_data;
199 int ret = EEH_STATE_NOT_SUPPORT;
201 if (phb->eeh_ops && phb->eeh_ops->get_state) {
202 ret = phb->eeh_ops->get_state(pe);
205 * If the PE state is temporarily unavailable,
206 * to inform the EEH core delay for default
211 if (ret & EEH_STATE_UNAVAILABLE)
220 * powernv_eeh_reset - Reset the specified PE
222 * @option: reset option
224 * Reset the specified PE
226 static int powernv_eeh_reset(struct eeh_pe *pe, int option)
228 struct pci_controller *hose = pe->phb;
229 struct pnv_phb *phb = hose->private_data;
232 if (phb->eeh_ops && phb->eeh_ops->reset)
233 ret = phb->eeh_ops->reset(pe, option);
239 * powernv_eeh_wait_state - Wait for PE state
241 * @max_wait: maximal period in microsecond
243 * Wait for the state of associated PE. It might take some time
244 * to retrieve the PE's state.
246 static int powernv_eeh_wait_state(struct eeh_pe *pe, int max_wait)
252 ret = powernv_eeh_get_state(pe, &mwait);
255 * If the PE's state is temporarily unavailable,
256 * we have to wait for the specified time. Otherwise,
257 * the PE's state will be returned immediately.
259 if (ret != EEH_STATE_UNAVAILABLE)
264 pr_warning("%s: Timeout getting PE#%x's state (%d)\n",
265 __func__, pe->addr, max_wait);
266 return EEH_STATE_NOT_SUPPORT;
272 return EEH_STATE_NOT_SUPPORT;
276 * powernv_eeh_get_log - Retrieve error log
278 * @severity: temporary or permanent error log
279 * @drv_log: driver log to be combined with retrieved error log
280 * @len: length of driver log
282 * Retrieve the temporary or permanent error from the PE.
284 static int powernv_eeh_get_log(struct eeh_pe *pe, int severity,
285 char *drv_log, unsigned long len)
287 struct pci_controller *hose = pe->phb;
288 struct pnv_phb *phb = hose->private_data;
291 if (phb->eeh_ops && phb->eeh_ops->get_log)
292 ret = phb->eeh_ops->get_log(pe, severity, drv_log, len);
298 * powernv_eeh_configure_bridge - Configure PCI bridges in the indicated PE
301 * The function will be called to reconfigure the bridges included
302 * in the specified PE so that the mulfunctional PE would be recovered
305 static int powernv_eeh_configure_bridge(struct eeh_pe *pe)
307 struct pci_controller *hose = pe->phb;
308 struct pnv_phb *phb = hose->private_data;
311 if (phb->eeh_ops && phb->eeh_ops->configure_bridge)
312 ret = phb->eeh_ops->configure_bridge(pe);
318 * powernv_eeh_next_error - Retrieve next EEH error to handle
321 * Using OPAL API, to retrieve next EEH error for EEH core to handle
323 static int powernv_eeh_next_error(struct eeh_pe **pe)
325 struct pci_controller *hose;
326 struct pnv_phb *phb = NULL;
328 list_for_each_entry(hose, &hose_list, list_node) {
329 phb = hose->private_data;
333 if (phb && phb->eeh_ops->next_error)
334 return phb->eeh_ops->next_error(pe);
339 static struct eeh_ops powernv_eeh_ops = {
341 .init = powernv_eeh_init,
342 .post_init = powernv_eeh_post_init,
344 .dev_probe = powernv_eeh_dev_probe,
345 .set_option = powernv_eeh_set_option,
346 .get_pe_addr = powernv_eeh_get_pe_addr,
347 .get_state = powernv_eeh_get_state,
348 .reset = powernv_eeh_reset,
349 .wait_state = powernv_eeh_wait_state,
350 .get_log = powernv_eeh_get_log,
351 .configure_bridge = powernv_eeh_configure_bridge,
352 .read_config = pnv_pci_cfg_read,
353 .write_config = pnv_pci_cfg_write,
354 .next_error = powernv_eeh_next_error
358 * eeh_powernv_init - Register platform dependent EEH operations
360 * EEH initialization on powernv platform. This function should be
361 * called before any EEH related functions.
363 static int __init eeh_powernv_init(void)
367 if (!machine_is(powernv))
370 ret = eeh_ops_register(&powernv_eeh_ops);
372 pr_info("EEH: PowerNV platform initialized\n");
374 pr_info("EEH: Failed to initialize PowerNV platform (%d)\n", ret);
379 early_initcall(eeh_powernv_init);