/*
* The file intends to implement the platform dependent EEH operations on
* powernv platform. Actually, the powernv was created in order to fully
* hypervisor support.
*
* Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2013.
*
* 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.
*/
#include <linux/atomic.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/msi.h>
#include <linux/of.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/rbtree.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
#include <asm/eeh.h>
#include <asm/eeh_event.h>
#include <asm/firmware.h>
#include <asm/io.h>
#include <asm/iommu.h>
#include <asm/machdep.h>
#include <asm/msi_bitmap.h>
#include <asm/opal.h>
#include <asm/ppc-pci.h>
#include "powernv.h"
#include "pci.h"
/**
* powernv_eeh_init - EEH platform dependent initialization
*
* EEH platform dependent initialization on powernv
*/
static int powernv_eeh_init(void)
{
struct pci_controller *hose;
struct pnv_phb *phb;
/* We require OPALv3 */
if (!firmware_has_feature(FW_FEATURE_OPALv3)) {
pr_warn("%s: OPALv3 is required !\n",
__func__);
return -EINVAL;
}
/* Set probe mode */
eeh_add_flag(EEH_PROBE_MODE_DEV);
/*
* P7IOC blocks PCI config access to frozen PE, but PHB3
* doesn't do that. So we have to selectively enable I/O
* prior to collecting error log.
*/
list_for_each_entry(hose, &hose_list, list_node) {
phb = hose->private_data;
if (phb->model == PNV_PHB_MODEL_P7IOC)
eeh_add_flag(EEH_ENABLE_IO_FOR_LOG);
break;
}
return 0;
}
/**
* powernv_eeh_post_init - EEH platform dependent post initialization
*
* EEH platform dependent post initialization on powernv. When
* the function is called, the EEH PEs and devices should have
* been built. If the I/O cache staff has been built, EEH is
* ready to supply service.
*/
static int powernv_eeh_post_init(void)
{
struct pci_controller *hose;
struct pnv_phb *phb;
int ret = 0;
list_for_each_entry(hose, &hose_list, list_node) {
phb = hose->private_data;
if (phb->eeh_ops && phb->eeh_ops->post_init) {
ret = phb->eeh_ops->post_init(hose);
if (ret)
break;
}
}
return ret;
}
/**
* powernv_eeh_dev_probe - Do probe on PCI device
* @dev: PCI device
* @flag: unused
*
* When EEH module is installed during system boot, all PCI devices
* are checked one by one to see if it supports EEH. The function
* is introduced for the purpose. By default, EEH has been enabled
* on all PCI devices. That's to say, we only need do necessary
* initialization on the corresponding eeh device and create PE
* accordingly.
*
* It's notable that's unsafe to retrieve the EEH device through
* the corresponding PCI device. During the PCI device hotplug, which
* was possiblly triggered by EEH core, the binding between EEH device
* and the PCI device isn't built yet.
*/
static int powernv_eeh_dev_probe(struct pci_dev *dev, void *flag)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
struct device_node *dn = pci_device_to_OF_node(dev);
struct eeh_dev *edev = of_node_to_eeh_dev(dn);
int ret;
/*
* When probing the root bridge, which doesn't have any
* subordinate PCI devices. We don't have OF node for
* the root bridge. So it's not reasonable to continue
* the probing.
*/
if (!dn || !edev || edev->pe)
return 0;
/* Skip for PCI-ISA bridge */
if ((dev->class >> 8) == PCI_CLASS_BRIDGE_ISA)
return 0;
/* Initialize eeh device */
edev->class_code = dev->class;
edev->mode &= 0xFFFFFF00;
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
edev->mode |= EEH_DEV_BRIDGE;
edev->pcix_cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
if (pci_is_pcie(dev)) {
edev->pcie_cap = pci_pcie_cap(dev);
if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT)
edev->mode |= EEH_DEV_ROOT_PORT;
else if (pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM)
edev->mode |= EEH_DEV_DS_PORT;
edev->aer_cap = pci_find_ext_capability(dev,
PCI_EXT_CAP_ID_ERR);
}
edev->config_addr = ((dev->bus->number << 8) | dev->devfn);
edev->pe_config_addr = phb->bdfn_to_pe(phb, dev->bus, dev->devfn & 0xff);
/* Create PE */
ret = eeh_add_to_parent_pe(edev);
if (ret) {
pr_warn("%s: Can't add PCI dev %s to parent PE (%d)\n",
__func__, pci_name(dev), ret);
return ret;
}
/*
* Cache the PE primary bus, which can't be fetched when
* full hotplug is in progress. In that case, all child
* PCI devices of the PE are expected to be removed prior
* to PE reset.
*/
if (!edev->pe->bus)
edev->pe->bus = dev->bus;
/*
* Enable EEH explicitly so that we will do EEH check
* while accessing I/O stuff
*/
eeh_add_flag(EEH_ENABLED);
/* Save memory bars */
eeh_save_bars(edev);
return 0;
}
/**
* powernv_eeh_set_option - Initialize EEH or MMIO/DMA reenable
* @pe: EEH PE
* @option: operation to be issued
*
* The function is used to control the EEH functionality globally.
* Currently, following options are support according to PAPR:
* Enable EEH, Disable EEH, Enable MMIO and Enable DMA
*/
static int powernv_eeh_set_option(struct eeh_pe *pe, int option)
{
struct pci_controller *hose = pe->phb;
struct pnv_phb *phb = hose->private_data;
int ret = -EEXIST;
/*
* What we need do is pass it down for hardware
* implementation to handle it.
*/
if (phb->eeh_ops && phb->eeh_ops->set_option)
ret = phb->eeh_ops->set_option(pe, option);
return ret;
}
/**
* powernv_eeh_get_pe_addr - Retrieve PE address
* @pe: EEH PE
*
* Retrieve the PE address according to the given tranditional
* PCI BDF (Bus/Device/Function) address.
*/
static int powernv_eeh_get_pe_addr(struct eeh_pe *pe)
{
return pe->addr;
}
/**
* powernv_eeh_get_state - Retrieve PE state
* @pe: EEH PE
* @delay: delay while PE state is temporarily unavailable
*
* Retrieve the state of the specified PE. For IODA-compitable
* platform, it should be retrieved from IODA table. Therefore,
* we prefer passing down to hardware implementation to handle
* it.
*/
static int powernv_eeh_get_state(struct eeh_pe *pe, int *delay)
{
struct pci_controller *hose = pe->phb;
struct pnv_phb *phb = hose->private_data;
int ret = EEH_STATE_NOT_SUPPORT;
if (phb->eeh_ops && phb->eeh_ops->get_state) {
ret = phb->eeh_ops->get_state(pe);
/*
* If the PE state is temporarily unavailable,
* to inform the EEH core delay for default
* period (1 second)
*/
if (delay) {
*delay = 0;
if (ret & EEH_STATE_UNAVAILABLE)
*delay = 1000;
}
}
return ret;
}
/**
* powernv_eeh_reset - Reset the specified PE
* @pe: EEH PE
* @option: reset option
*
* Reset the specified PE
*/
static int powernv_eeh_reset(struct eeh_pe *pe, int option)
{
struct pci_controller *hose = pe->phb;
struct pnv_phb *phb = hose->private_data;
int ret = -EEXIST;
if (phb->eeh_ops && phb->eeh_ops->reset)
ret = phb->eeh_ops->reset(pe, option);
return ret;
}
/**
* powernv_eeh_wait_state - Wait for PE state
* @pe: EEH PE
* @max_wait: maximal period in microsecond
*
* Wait for the state of associated PE. It might take some time
* to retrieve the PE's state.
*/
static int powernv_eeh_wait_state(struct eeh_pe *pe, int max_wait)
{
int ret;
int mwait;
while (1) {
ret = powernv_eeh_get_state(pe, &mwait);
/*
* If the PE's state is temporarily unavailable,
* we have to wait for the specified time. Otherwise,
* the PE's state will be returned immediately.
*/
if (ret != EEH_STATE_UNAVAILABLE)
return ret;
max_wait -= mwait;
if (max_wait <= 0) {
pr_warn("%s: Timeout getting PE#%x's state (%d)\n",
__func__, pe->addr, max_wait);
return EEH_STATE_NOT_SUPPORT;
}
msleep(mwait);
}
return EEH_STATE_NOT_SUPPORT;
}
/**
* powernv_eeh_get_log - Retrieve error log
* @pe: EEH PE
* @severity: temporary or permanent error log
* @drv_log: driver log to be combined with retrieved error log
* @len: length of driver log
*
* Retrieve the temporary or permanent error from the PE.
*/
static int powernv_eeh_get_log(struct eeh_pe *pe, int severity,
char *drv_log, unsigned long len)
{
struct pci_controller *hose = pe->phb;
struct pnv_phb *phb = hose->private_data;
int ret = -EEXIST;
if (phb->eeh_ops && phb->eeh_ops->get_log)
ret = phb->eeh_ops->get_log(pe, severity, drv_log, len);
return ret;
}
/**
* powernv_eeh_configure_bridge - Configure PCI bridges in the indicated PE
* @pe: EEH PE
*
* The function will be called to reconfigure the bridges included
* in the specified PE so that the mulfunctional PE would be recovered
* again.
*/
static int powernv_eeh_configure_bridge(struct eeh_pe *pe)
{
struct pci_controller *hose = pe->phb;
struct pnv_phb *phb = hose->private_data;
int ret = 0;
if (phb->eeh_ops && phb->eeh_ops->configure_bridge)
ret = phb->eeh_ops->configure_bridge(pe);
return ret;
}
/**
* powernv_pe_err_inject - Inject specified error to the indicated PE
* @pe: the indicated PE
* @type: error type
* @func: specific error type
* @addr: address
* @mask: address mask
*
* The routine is called to inject specified error, which is
* determined by @type and @func, to the indicated PE for
* testing purpose.
*/
static int powernv_eeh_err_inject(struct eeh_pe *pe, int type, int func,
unsigned long addr, unsigned long mask)
{
struct pci_controller *hose = pe->phb;
struct pnv_phb *phb = hose->private_data;
int ret = -EEXIST;
if (phb->eeh_ops && phb->eeh_ops->err_inject)
ret = phb->eeh_ops->err_inject(pe, type, func, addr, mask);
return ret;
}
/**
* powernv_eeh_next_error - Retrieve next EEH error to handle
* @pe: Affected PE
*
* Using OPAL API, to retrieve next EEH error for EEH core to handle
*/
static int powernv_eeh_next_error(struct eeh_pe **pe)
{
struct pci_controller *hose;
struct pnv_phb *phb = NULL;
list_for_each_entry(hose, &hose_list, list_node) {
phb = hose->private_data;
break;
}
if (phb && phb->eeh_ops->next_error)
return phb->eeh_ops->next_error(pe);
return -EEXIST;
}
static int powernv_eeh_restore_config(struct device_node *dn)
{
struct eeh_dev *edev = of_node_to_eeh_dev(dn);
struct pnv_phb *phb;
s64 ret;
if (!edev)
return -EEXIST;
phb = edev->phb->private_data;
ret = opal_pci_reinit(phb->opal_id,
OPAL_REINIT_PCI_DEV, edev->config_addr);
if (ret) {
pr_warn("%s: Can't reinit PCI dev 0x%x (%lld)\n",
__func__, edev->config_addr, ret);
return -EIO;
}
return 0;
}
static struct eeh_ops powernv_eeh_ops = {
.name = "powernv",
.init = powernv_eeh_init,
.post_init = powernv_eeh_post_init,
.of_probe = NULL,
.dev_probe = powernv_eeh_dev_probe,
.set_option = powernv_eeh_set_option,
.get_pe_addr = powernv_eeh_get_pe_addr,
.get_state = powernv_eeh_get_state,
.reset = powernv_eeh_reset,
.wait_state = powernv_eeh_wait_state,
.get_log = powernv_eeh_get_log,
.configure_bridge = powernv_eeh_configure_bridge,
.err_inject = powernv_eeh_err_inject,
.read_config = pnv_pci_cfg_read,
.write_config = pnv_pci_cfg_write,
.next_error = powernv_eeh_next_error,
.restore_config = powernv_eeh_restore_config
};
/**
* eeh_powernv_init - Register platform dependent EEH operations
*
* EEH initialization on powernv platform. This function should be
* called before any EEH related functions.
*/
static int __init eeh_powernv_init(void)
{
int ret = -EINVAL;
eeh_set_pe_aux_size(PNV_PCI_DIAG_BUF_SIZE);
ret = eeh_ops_register(&powernv_eeh_ops);
if (!ret)
pr_info("EEH: PowerNV platform initialized\n");
else
pr_info("EEH: Failed to initialize PowerNV platform (%d)\n", ret);
return ret;
}
machine_early_initcall(powernv, eeh_powernv_init);
