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powerpc/eeh: Do probe on pci_dn

Browse source 
Originally, EEH core probes on device_node or pci_dev to populate
EEH devices and PEs, which conflicts with the fact: SRIOV VFs are
usually enabled and created by PF's driver and they don't have the
corresponding device_nodes. Instead, SRIOV VFs have dynamically
created pci_dn, which can be used for EEH probe.

The patch reworks EEH probe for PowerNV and pSeries platforms to
do probing based on pci_dn, instead of pci_dev or device_node any
more.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Gavin Shan 2015-03-17 16:15:06 +11:00 • committed by Benjamin Herrenschmidt
commit ff57b454dd
8 changed files with 172 additions and 138 deletions
Download patch file Download diff file Expand all files Collapse all files

11
arch/powerpc/include/asm/eeh.h
View file

@ -207,8 +207,7 @@ struct eeh_ops {
char *name;
int (*init)(void);
int (*post_init)(void);
void* (*of_probe)(struct device_node *dn, void *flag);
int (*dev_probe)(struct pci_dev *dev, void *flag);
void* (*probe)(struct pci_dn *pdn, void *data);
int (*set_option)(struct eeh_pe *pe, int option);
int (*get_pe_addr)(struct eeh_pe *pe);
int (*get_state)(struct eeh_pe *pe, int *state);
@ -287,8 +286,8 @@ int __exit eeh_ops_unregister(const char *name);
int eeh_check_failure(const volatile void __iomem *token);
int eeh_dev_check_failure(struct eeh_dev *edev);
void eeh_addr_cache_build(void);
void eeh_add_device_early(struct device_node *);
void eeh_add_device_tree_early(struct device_node *);
void eeh_add_device_early(struct pci_dn *);
void eeh_add_device_tree_early(struct pci_dn *);
void eeh_add_device_late(struct pci_dev *);
void eeh_add_device_tree_late(struct pci_bus *);
void eeh_add_sysfs_files(struct pci_bus *);
@ -346,9 +345,9 @@ static inline int eeh_check_failure(const volatile void __iomem *token)
static inline void eeh_addr_cache_build(void) { }
static inline void eeh_add_device_early(struct device_node *dn) { }
static inline void eeh_add_device_early(struct pci_dn *pdn) { }
static inline void eeh_add_device_tree_early(struct device_node *dn) { }
static inline void eeh_add_device_tree_early(struct pci_dn *pdn) { }
static inline void eeh_add_device_late(struct pci_dev *dev) { }

63
arch/powerpc/kernel/eeh.c
View file

@ -969,7 +969,7 @@ static struct notifier_block eeh_reboot_nb = {
int eeh_init(void)
{
struct pci_controller *hose, *tmp;
struct device_node *phb;
struct pci_dn *pdn;
static int cnt = 0;
int ret = 0;
@ -1004,20 +1004,9 @@ int eeh_init(void)
return ret;
/* Enable EEH for all adapters */
if (eeh_has_flag(EEH_PROBE_MODE_DEVTREE)) {
list_for_each_entry_safe(hose, tmp,
&hose_list, list_node) {
phb = hose->dn;
traverse_pci_devices(phb, eeh_ops->of_probe, NULL);
}
} else if (eeh_has_flag(EEH_PROBE_MODE_DEV)) {
list_for_each_entry_safe(hose, tmp,
&hose_list, list_node)
pci_walk_bus(hose->bus, eeh_ops->dev_probe, NULL);
} else {
pr_warn("%s: Invalid probe mode %x",
__func__, eeh_subsystem_flags);
return -EINVAL;
list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
pdn = hose->pci_data;
traverse_pci_dn(pdn, eeh_ops->probe, NULL);
}
/*
@ -1043,7 +1032,7 @@ core_initcall_sync(eeh_init);
/**
* eeh_add_device_early - Enable EEH for the indicated device_node
* @dn: device node for which to set up EEH
* @pdn: PCI device node for which to set up EEH
*
* This routine must be used to perform EEH initialization for PCI
* devices that were added after system boot (e.g. hotplug, dlpar).
@ -1053,44 +1042,41 @@ core_initcall_sync(eeh_init);
* on the CEC architecture, type of the device, on earlier boot
* command-line arguments & etc.
*/
void eeh_add_device_early(struct device_node *dn)
void eeh_add_device_early(struct pci_dn *pdn)
{
struct pci_controller *phb;
struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
/*
* If we're doing EEH probe based on PCI device, we
* would delay the probe until late stage because
* the PCI device isn't available this moment.
*/
if (!eeh_has_flag(EEH_PROBE_MODE_DEVTREE))
if (!edev)
return;
if (!of_node_to_eeh_dev(dn))
return;
phb = of_node_to_eeh_dev(dn)->phb;
/* USB Bus children of PCI devices will not have BUID's */
if (NULL == phb || 0 == phb->buid)
phb = edev->phb;
if (NULL == phb ||
(eeh_has_flag(EEH_PROBE_MODE_DEVTREE) && 0 == phb->buid))
return;
eeh_ops->of_probe(dn, NULL);
eeh_ops->probe(pdn, NULL);
}
/**
* eeh_add_device_tree_early - Enable EEH for the indicated device
* @dn: device node
* @pdn: PCI device node
*
* This routine must be used to perform EEH initialization for the
* indicated PCI device that was added after system boot (e.g.
* hotplug, dlpar).
*/
void eeh_add_device_tree_early(struct device_node *dn)
void eeh_add_device_tree_early(struct pci_dn *pdn)
{
struct device_node *sib;
struct pci_dn *n;
for_each_child_of_node(dn, sib)
eeh_add_device_tree_early(sib);
eeh_add_device_early(dn);
if (!pdn)
return;
list_for_each_entry(n, &pdn->child_list, list)
eeh_add_device_tree_early(n);
eeh_add_device_early(pdn);
}
EXPORT_SYMBOL_GPL(eeh_add_device_tree_early);
@ -1144,13 +1130,6 @@ void eeh_add_device_late(struct pci_dev *dev)
edev->pdev = dev;
dev->dev.archdata.edev = edev;
/*
* We have to do the EEH probe here because the PCI device
* hasn't been created yet in the early stage.
*/
if (eeh_has_flag(EEH_PROBE_MODE_DEV))
eeh_ops->dev_probe(dev, NULL);
eeh_addr_cache_insert_dev(dev);
}

2
arch/powerpc/kernel/of_platform.c
View file

@ -72,7 +72,7 @@ static int of_pci_phb_probe(struct platform_device *dev)
/* Register devices with EEH */
if (dev->dev.of_node->child)
eeh_add_device_tree_early(dev->dev.of_node);
eeh_add_device_tree_early(PCI_DN(dev->dev.of_node));
/* Scan the bus */
pcibios_scan_phb(phb);

2
arch/powerpc/kernel/pci-hotplug.c
View file

@ -75,7 +75,7 @@ void pcibios_add_pci_devices(struct pci_bus * bus)
struct pci_dev *dev;
struct device_node *dn = pci_bus_to_OF_node(bus);
eeh_add_device_tree_early(dn);
eeh_add_device_tree_early(PCI_DN(dn));
mode = PCI_PROBE_NORMAL;
if (ppc_md.pci_probe_mode)

146
arch/powerpc/platforms/powernv/eeh-powernv.c
View file

@ -286,10 +286,82 @@ static int pnv_eeh_post_init(void)
return ret;
}
static int pnv_eeh_cap_start(struct pci_dn *pdn)
{
u32 status;
if (!pdn)
return 0;
pnv_pci_cfg_read(pdn, PCI_STATUS, 2, &status);
if (!(status & PCI_STATUS_CAP_LIST))
return 0;
return PCI_CAPABILITY_LIST;
}
static int pnv_eeh_find_cap(struct pci_dn *pdn, int cap)
{
int pos = pnv_eeh_cap_start(pdn);
int cnt = 48; /* Maximal number of capabilities */
u32 id;
if (!pos)
return 0;
while (cnt--) {
pnv_pci_cfg_read(pdn, pos, 1, &pos);
if (pos < 0x40)
break;
pos &= ~3;
pnv_pci_cfg_read(pdn, pos + PCI_CAP_LIST_ID, 1, &id);
if (id == 0xff)
break;
/* Found */
if (id == cap)
return pos;
/* Next one */
pos += PCI_CAP_LIST_NEXT;
}
return 0;
}
static int pnv_eeh_find_ecap(struct pci_dn *pdn, int cap)
{
struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
u32 header;
int pos = 256, ttl = (4096 - 256) / 8;
if (!edev || !edev->pcie_cap)
return 0;
if (pnv_pci_cfg_read(pdn, pos, 4, &header) != PCIBIOS_SUCCESSFUL)
return 0;
else if (!header)
return 0;
while (ttl-- > 0) {
if (PCI_EXT_CAP_ID(header) == cap && pos)
return pos;
pos = PCI_EXT_CAP_NEXT(header);
if (pos < 256)
break;
if (pnv_pci_cfg_read(pdn, pos, 4, &header) != PCIBIOS_SUCCESSFUL)
break;
}
return 0;
}
/**
* pnv_eeh_dev_probe - Do probe on PCI device
* @dev: PCI device
* @flag: unused
* pnv_eeh_probe - Do probe on PCI device
* @pdn: PCI device node
* @data: 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
@ -303,12 +375,12 @@ static int pnv_eeh_post_init(void)
* was possiblly triggered by EEH core, the binding between EEH device
* and the PCI device isn't built yet.
*/
static int pnv_eeh_dev_probe(struct pci_dev *dev, void *flag)
static void *pnv_eeh_probe(struct pci_dn *pdn, void *data)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pci_controller *hose = pdn->phb;
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);
struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
uint32_t pcie_flags;
int ret;
/*
@ -317,40 +389,42 @@ static int pnv_eeh_dev_probe(struct pci_dev *dev, void *flag)
* the root bridge. So it's not reasonable to continue
* the probing.
*/
if (!dn || !edev || edev->pe)
return 0;
if (!edev || edev->pe)
return NULL;
/* Skip for PCI-ISA bridge */
if ((dev->class >> 8) == PCI_CLASS_BRIDGE_ISA)
return 0;
if ((pdn->class_code >> 8) == PCI_CLASS_BRIDGE_ISA)
return NULL;
/* Initialize eeh device */
edev->class_code = dev->class;
edev->class_code = pdn->class_code;
edev->mode &= 0xFFFFFF00;
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
edev->pcix_cap = pnv_eeh_find_cap(pdn, PCI_CAP_ID_PCIX);
edev->pcie_cap = pnv_eeh_find_cap(pdn, PCI_CAP_ID_EXP);
edev->aer_cap = pnv_eeh_find_ecap(pdn, PCI_EXT_CAP_ID_ERR);
if ((edev->class_code >> 8) == PCI_CLASS_BRIDGE_PCI) {
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);
if (edev->pcie_cap) {
pnv_pci_cfg_read(pdn, edev->pcie_cap + PCI_EXP_FLAGS,
2, &pcie_flags);
pcie_flags = (pcie_flags & PCI_EXP_FLAGS_TYPE) >> 4;
if (pcie_flags == PCI_EXP_TYPE_ROOT_PORT)
edev->mode |= EEH_DEV_ROOT_PORT;
else if (pcie_flags == PCI_EXP_TYPE_DOWNSTREAM)
edev->mode |= EEH_DEV_DS_PORT;
}
}
edev->config_addr = ((dev->bus->number << 8) | dev->devfn);
edev->pe_config_addr = phb->bdfn_to_pe(phb, dev->bus, dev->devfn & 0xff);
edev->config_addr = (pdn->busno << 8) | (pdn->devfn);
edev->pe_config_addr = phb->ioda.pe_rmap[edev->config_addr];
/* 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;
pr_warn("%s: Can't add PCI dev %04x:%02x:%02x.%01x to parent PE (%d)\n",
__func__, hose->global_number, pdn->busno,
PCI_SLOT(pdn->devfn), PCI_FUNC(pdn->devfn), ret);
return NULL;
}
/*
@ -369,8 +443,10 @@ static int pnv_eeh_dev_probe(struct pci_dev *dev, void *flag)
* Broadcom Austin 4-ports NICs (14e4:1657)
* Broadcom Shiner 2-ports 10G NICs (14e4:168e)
*/
if ((dev->vendor == PCI_VENDOR_ID_BROADCOM && dev->device == 0x1657) ||
(dev->vendor == PCI_VENDOR_ID_BROADCOM && dev->device == 0x168e))
if ((pdn->vendor_id == PCI_VENDOR_ID_BROADCOM &&
pdn->device_id == 0x1657) ||
(pdn->vendor_id == PCI_VENDOR_ID_BROADCOM &&
pdn->device_id == 0x168e))
edev->pe->state |= EEH_PE_CFG_RESTRICTED;
/*
@ -380,7 +456,8 @@ static int pnv_eeh_dev_probe(struct pci_dev *dev, void *flag)
* to PE reset.
*/
if (!edev->pe->bus)
edev->pe->bus = dev->bus;
edev->pe->bus = pci_find_bus(hose->global_number,
pdn->busno);
/*
* Enable EEH explicitly so that we will do EEH check
@ -391,7 +468,7 @@ static int pnv_eeh_dev_probe(struct pci_dev *dev, void *flag)
/* Save memory bars */
eeh_save_bars(edev);
return 0;
return NULL;
}
/**
@ -1432,8 +1509,7 @@ static struct eeh_ops pnv_eeh_ops = {
.name = "powernv",
.init = pnv_eeh_init,
.post_init = pnv_eeh_post_init,
.of_probe = NULL,
.dev_probe = pnv_eeh_dev_probe,
.probe = pnv_eeh_probe,
.set_option = pnv_eeh_set_option,
.get_pe_addr = pnv_eeh_get_pe_addr,
.get_state = pnv_eeh_get_state,

82
arch/powerpc/platforms/pseries/eeh_pseries.c
View file

@ -118,9 +118,8 @@ static int pseries_eeh_init(void)
return 0;
}
static int pseries_eeh_cap_start(struct device_node *dn)
static int pseries_eeh_cap_start(struct pci_dn *pdn)
{
struct pci_dn *pdn = PCI_DN(dn);
u32 status;
if (!pdn)
@ -134,10 +133,9 @@ static int pseries_eeh_cap_start(struct device_node *dn)
}
static int pseries_eeh_find_cap(struct device_node *dn, int cap)
static int pseries_eeh_find_cap(struct pci_dn *pdn, int cap)
{
struct pci_dn *pdn = PCI_DN(dn);
int pos = pseries_eeh_cap_start(dn);
int pos = pseries_eeh_cap_start(pdn);
int cnt = 48; /* Maximal number of capabilities */
u32 id;
@ -160,10 +158,9 @@ static int pseries_eeh_find_cap(struct device_node *dn, int cap)
return 0;
}
static int pseries_eeh_find_ecap(struct device_node *dn, int cap)
static int pseries_eeh_find_ecap(struct pci_dn *pdn, int cap)
{
struct pci_dn *pdn = PCI_DN(dn);
struct eeh_dev *edev = of_node_to_eeh_dev(dn);
struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
u32 header;
int pos = 256;
int ttl = (4096 - 256) / 8;
@ -191,53 +188,44 @@ static int pseries_eeh_find_ecap(struct device_node *dn, int cap)
}
/**
* pseries_eeh_of_probe - EEH probe on the given device
* @dn: OF node
* @flag: Unused
* pseries_eeh_probe - EEH probe on the given device
* @pdn: PCI device node
* @data: 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.
*/
static void *pseries_eeh_of_probe(struct device_node *dn, void *flag)
static void *pseries_eeh_probe(struct pci_dn *pdn, void *data)
{
struct eeh_dev *edev;
struct eeh_pe pe;
struct pci_dn *pdn = PCI_DN(dn);
const __be32 *classp, *vendorp, *devicep;
u32 class_code;
const __be32 *regs;
u32 pcie_flags;
int enable = 0;
int ret;
/* Retrieve OF node and eeh device */
edev = of_node_to_eeh_dev(dn);
if (edev->pe || !of_device_is_available(dn))
edev = pdn_to_eeh_dev(pdn);
if (!edev || edev->pe)
return NULL;
/* Retrieve class/vendor/device IDs */
classp = of_get_property(dn, "class-code", NULL);
vendorp = of_get_property(dn, "vendor-id", NULL);
devicep = of_get_property(dn, "device-id", NULL);
/* Skip for bad OF node or PCI-ISA bridge */
if (!classp || !vendorp || !devicep)
return NULL;
if (dn->type && !strcmp(dn->type, "isa"))
/* Check class/vendor/device IDs */
if (!pdn->vendor_id || !pdn->device_id || !pdn->class_code)
return NULL;
class_code = of_read_number(classp, 1);
/* Skip for PCI-ISA bridge */
if ((pdn->class_code >> 8) == PCI_CLASS_BRIDGE_ISA)
return NULL;
/*
* Update class code and mode of eeh device. We need
* correctly reflects that current device is root port
* or PCIe switch downstream port.
*/
edev->class_code = class_code;
edev->pcix_cap = pseries_eeh_find_cap(dn, PCI_CAP_ID_PCIX);
edev->pcie_cap = pseries_eeh_find_cap(dn, PCI_CAP_ID_EXP);
edev->aer_cap = pseries_eeh_find_ecap(dn, PCI_EXT_CAP_ID_ERR);
edev->class_code = pdn->class_code;
edev->pcix_cap = pseries_eeh_find_cap(pdn, PCI_CAP_ID_PCIX);
edev->pcie_cap = pseries_eeh_find_cap(pdn, PCI_CAP_ID_EXP);
edev->aer_cap = pseries_eeh_find_ecap(pdn, PCI_EXT_CAP_ID_ERR);
edev->mode &= 0xFFFFFF00;
if ((edev->class_code >> 8) == PCI_CLASS_BRIDGE_PCI) {
edev->mode |= EEH_DEV_BRIDGE;
@ -252,24 +240,16 @@ static void *pseries_eeh_of_probe(struct device_node *dn, void *flag)
}
}
/* Retrieve the device address */
regs = of_get_property(dn, "reg", NULL);
if (!regs) {
pr_warn("%s: OF node property %s::reg not found\n",
__func__, dn->full_name);
return NULL;
}
/* Initialize the fake PE */
memset(&pe, 0, sizeof(struct eeh_pe));
pe.phb = edev->phb;
pe.config_addr = of_read_number(regs, 1);
pe.config_addr = (pdn->busno << 16) | (pdn->devfn << 8);
/* Enable EEH on the device */
ret = eeh_ops->set_option(&pe, EEH_OPT_ENABLE);
if (!ret) {
edev->config_addr = of_read_number(regs, 1);
/* Retrieve PE address */
edev->config_addr = (pdn->busno << 16) | (pdn->devfn << 8);
edev->pe_config_addr = eeh_ops->get_pe_addr(&pe);
pe.addr = edev->pe_config_addr;
@ -285,16 +265,17 @@ static void *pseries_eeh_of_probe(struct device_node *dn, void *flag)
eeh_add_flag(EEH_ENABLED);
eeh_add_to_parent_pe(edev);
pr_debug("%s: EEH enabled on %s PHB#%d-PE#%x, config addr#%x\n",
__func__, dn->full_name, pe.phb->global_number,
pe.addr, pe.config_addr);
} else if (dn->parent && of_node_to_eeh_dev(dn->parent) &&
(of_node_to_eeh_dev(dn->parent))->pe) {
pr_debug("%s: EEH enabled on %02x:%02x.%01x PHB#%d-PE#%x\n",
__func__, pdn->busno, PCI_SLOT(pdn->devfn),
PCI_FUNC(pdn->devfn), pe.phb->global_number,
pe.addr);
} else if (pdn->parent && pdn_to_eeh_dev(pdn->parent) &&
(pdn_to_eeh_dev(pdn->parent))->pe) {
/* This device doesn't support EEH, but it may have an
* EEH parent, in which case we mark it as supported.
*/
edev->config_addr = of_node_to_eeh_dev(dn->parent)->config_addr;
edev->pe_config_addr = of_node_to_eeh_dev(dn->parent)->pe_config_addr;
edev->config_addr = pdn_to_eeh_dev(pdn->parent)->config_addr;
edev->pe_config_addr = pdn_to_eeh_dev(pdn->parent)->pe_config_addr;
eeh_add_to_parent_pe(edev);
}
}
@ -707,8 +688,7 @@ static int pseries_eeh_write_config(struct device_node *dn, int where, int size,
static struct eeh_ops pseries_eeh_ops = {
.name = "pseries",
.init = pseries_eeh_init,
.of_probe = pseries_eeh_of_probe,
.dev_probe = NULL,
.probe = pseries_eeh_probe,
.set_option = pseries_eeh_set_option,
.get_pe_addr = pseries_eeh_get_pe_addr,
.get_state = pseries_eeh_get_state,

2
arch/powerpc/platforms/pseries/pci_dlpar.c
View file

@ -82,7 +82,7 @@ struct pci_controller *init_phb_dynamic(struct device_node *dn)
eeh_dev_phb_init_dynamic(phb);
if (dn->child)
eeh_add_device_tree_early(dn);
eeh_add_device_tree_early(PCI_DN(dn));
pcibios_scan_phb(phb);
pcibios_finish_adding_to_bus(phb->bus);

2
drivers/pci/hotplug/rpadlpar_core.c
View file

@ -146,7 +146,7 @@ static void dlpar_pci_add_bus(struct device_node *dn)
struct pci_controller *phb = pdn->phb;
struct pci_dev *dev = NULL;
eeh_add_device_tree_early(dn);
eeh_add_device_tree_early(pdn);
/* Add EADS device to PHB bus, adding new entry to bus->devices */
dev = of_create_pci_dev(dn, phb->bus, pdn->devfn);