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linux/drivers/pci/hotplug/sgi_hotplug.c

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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2005-2006 Silicon Graphics, Inc. All rights reserved.
*
* This work was based on the 2.4/2.6 kernel development by Dick Reigner.
* Work to add BIOS PROM support was completed by Mike Habeck.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/mutex.h>
#include <asm/sn/addrs.h>
#include <asm/sn/geo.h>
#include <asm/sn/l1.h>
#include <asm/sn/module.h>
#include <asm/sn/pcibr_provider.h>
#include <asm/sn/pcibus_provider_defs.h>
#include <asm/sn/pcidev.h>
#include <asm/sn/sn_feature_sets.h>
#include <asm/sn/sn_sal.h>
#include <asm/sn/types.h>
#include <linux/acpi.h>
#include <asm/sn/acpi.h>
#include "../pci.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("SGI (prarit@sgi.com, dickie@sgi.com, habeck@sgi.com)");
MODULE_DESCRIPTION("SGI Altix Hot Plug PCI Controller Driver");
/* SAL call error codes. Keep in sync with prom header io/include/pcibr.h */
#define PCI_SLOT_ALREADY_UP 2 /* slot already up */
#define PCI_SLOT_ALREADY_DOWN 3 /* slot already down */
#define PCI_L1_ERR 7 /* L1 console command error */
#define PCI_EMPTY_33MHZ 15 /* empty 33 MHz bus */
#define PCIIO_ASIC_TYPE_TIOCA 4
#define PCI_L1_QSIZE 128 /* our L1 message buffer size */
#define SN_MAX_HP_SLOTS 32 /* max hotplug slots */
#define SN_SLOT_NAME_SIZE 33 /* size of name string */
/* internal list head */
static struct list_head sn_hp_list;
/* hotplug_slot struct's private pointer */
struct slot {
int device_num;
struct pci_bus *pci_bus;
/* this struct for glue internal only */
struct hotplug_slot *hotplug_slot;
struct list_head hp_list;
char physical_path[SN_SLOT_NAME_SIZE];
};
struct pcibr_slot_enable_resp {
int resp_sub_errno;
char resp_l1_msg[PCI_L1_QSIZE + 1];
};
struct pcibr_slot_disable_resp {
int resp_sub_errno;
char resp_l1_msg[PCI_L1_QSIZE + 1];
};
enum sn_pci_req_e {
PCI_REQ_SLOT_ELIGIBLE,
PCI_REQ_SLOT_DISABLE
};
static int enable_slot(struct hotplug_slot *slot);
static int disable_slot(struct hotplug_slot *slot);
static inline int get_power_status(struct hotplug_slot *slot, u8 *value);
static struct hotplug_slot_ops sn_hotplug_slot_ops = {
.enable_slot = enable_slot,
.disable_slot = disable_slot,
.get_power_status = get_power_status,
};
static DEFINE_MUTEX(sn_hotplug_mutex);
static ssize_t path_show(struct pci_slot *pci_slot, char *buf)
{
int retval = -ENOENT;
struct slot *slot = pci_slot->hotplug->private;
if (!slot)
return retval;
retval = sprintf (buf, "%s\n", slot->physical_path);
return retval;
}
static struct pci_slot_attribute sn_slot_path_attr = __ATTR_RO(path);
static int sn_pci_slot_valid(struct pci_bus *pci_bus, int device)
{
struct pcibus_info *pcibus_info;
u16 busnum, segment, ioboard_type;
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
/* Check to see if this is a valid slot on 'pci_bus' */
if (!(pcibus_info->pbi_valid_devices & (1 << device)))
return -EPERM;
ioboard_type = sn_ioboard_to_pci_bus(pci_bus);
busnum = pcibus_info->pbi_buscommon.bs_persist_busnum;
segment = pci_domain_nr(pci_bus) & 0xf;
/* Do not allow hotplug operations on base I/O cards */
if ((ioboard_type == L1_BRICKTYPE_IX ||
ioboard_type == L1_BRICKTYPE_IA) &&
(segment == 1 && busnum == 0 && device != 1))
return -EPERM;
return 1;
}
static int sn_pci_bus_valid(struct pci_bus *pci_bus)
{
struct pcibus_info *pcibus_info;
u32 asic_type;
u16 ioboard_type;
/* Don't register slots hanging off the TIOCA bus */
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
asic_type = pcibus_info->pbi_buscommon.bs_asic_type;
if (asic_type == PCIIO_ASIC_TYPE_TIOCA)
return -EPERM;
/* Only register slots in I/O Bricks that support hotplug */
ioboard_type = sn_ioboard_to_pci_bus(pci_bus);
switch (ioboard_type) {
case L1_BRICKTYPE_IX:
case L1_BRICKTYPE_PX:
case L1_BRICKTYPE_IA:
case L1_BRICKTYPE_PA:
case L1_BOARDTYPE_PCIX3SLOT:
return 1;
break;
default:
return -EPERM;
break;
}
return -EIO;
}
static int sn_hp_slot_private_alloc(struct hotplug_slot *bss_hotplug_slot,
struct pci_bus *pci_bus, int device,
char *name)
{
struct pcibus_info *pcibus_info;
struct slot *slot;
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
slot = kzalloc(sizeof(*slot), GFP_KERNEL);
if (!slot)
return -ENOMEM;
bss_hotplug_slot->private = slot;
slot->device_num = device;
slot->pci_bus = pci_bus;
sprintf(name, "%04x:%02x:%02x",
pci_domain_nr(pci_bus),
((u16)pcibus_info->pbi_buscommon.bs_persist_busnum),
device + 1);
sn_generate_path(pci_bus, slot->physical_path);
slot->hotplug_slot = bss_hotplug_slot;
list_add(&slot->hp_list, &sn_hp_list);
return 0;
}
static struct hotplug_slot * sn_hp_destroy(void)
{
struct slot *slot;
struct pci_slot *pci_slot;
struct hotplug_slot *bss_hotplug_slot = NULL;
list_for_each_entry(slot, &sn_hp_list, hp_list) {
bss_hotplug_slot = slot->hotplug_slot;
pci_slot = bss_hotplug_slot->pci_slot;
list_del(&((struct slot *)bss_hotplug_slot->private)->
hp_list);
sysfs_remove_file(&pci_slot->kobj,
&sn_slot_path_attr.attr);
break;
}
return bss_hotplug_slot;
}
static void sn_bus_free_data(struct pci_dev *dev)
{
struct pci_bus *subordinate_bus;
struct pci_dev *child;
/* Recursively clean up sn_irq_info structs */
if (dev->subordinate) {
subordinate_bus = dev->subordinate;
list_for_each_entry(child, &subordinate_bus->devices, bus_list)
sn_bus_free_data(child);
}
/*
* Some drivers may use dma accesses during the
* driver remove function. We release the sysdata
* areas after the driver remove functions have
* been called.
*/
sn_bus_store_sysdata(dev);
sn_pci_unfixup_slot(dev);
}
static int sn_slot_enable(struct hotplug_slot *bss_hotplug_slot,
int device_num, char **ssdt)
{
struct slot *slot = bss_hotplug_slot->private;
struct pcibus_info *pcibus_info;
struct pcibr_slot_enable_resp resp;
int rc;
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
/*
* Power-on and initialize the slot in the SN
* PCI infrastructure.
*/
rc = sal_pcibr_slot_enable(pcibus_info, device_num, &resp, ssdt);
if (rc == PCI_SLOT_ALREADY_UP) {
dev_dbg(&slot->pci_bus->self->dev, "is already active\n");
return 1; /* return 1 to user */
}
if (rc == PCI_L1_ERR) {
dev_dbg(&slot->pci_bus->self->dev,
"L1 failure %d with message: %s",
resp.resp_sub_errno, resp.resp_l1_msg);
return -EPERM;
}
if (rc) {
dev_dbg(&slot->pci_bus->self->dev,
"insert failed with error %d sub-error %d\n",
rc, resp.resp_sub_errno);
return -EIO;
}
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
pcibus_info->pbi_enabled_devices |= (1 << device_num);
return 0;
}
static int sn_slot_disable(struct hotplug_slot *bss_hotplug_slot,
int device_num, int action)
{
struct slot *slot = bss_hotplug_slot->private;
struct pcibus_info *pcibus_info;
struct pcibr_slot_disable_resp resp;
int rc;
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
rc = sal_pcibr_slot_disable(pcibus_info, device_num, action, &resp);
if ((action == PCI_REQ_SLOT_ELIGIBLE) &&
(rc == PCI_SLOT_ALREADY_DOWN)) {
dev_dbg(&slot->pci_bus->self->dev, "Slot %s already inactive\n", slot->physical_path);
return 1; /* return 1 to user */
}
if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_EMPTY_33MHZ)) {
dev_dbg(&slot->pci_bus->self->dev,
"Cannot remove last 33MHz card\n");
return -EPERM;
}
if ((action == PCI_REQ_SLOT_ELIGIBLE) && (rc == PCI_L1_ERR)) {
dev_dbg(&slot->pci_bus->self->dev,
"L1 failure %d with message \n%s\n",
resp.resp_sub_errno, resp.resp_l1_msg);
return -EPERM;
}
if ((action == PCI_REQ_SLOT_ELIGIBLE) && rc) {
dev_dbg(&slot->pci_bus->self->dev,
"remove failed with error %d sub-error %d\n",
rc, resp.resp_sub_errno);
return -EIO;
}
if ((action == PCI_REQ_SLOT_ELIGIBLE) && !rc)
return 0;
if ((action == PCI_REQ_SLOT_DISABLE) && !rc) {
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
pcibus_info->pbi_enabled_devices &= ~(1 << device_num);
dev_dbg(&slot->pci_bus->self->dev, "remove successful\n");
return 0;
}
if ((action == PCI_REQ_SLOT_DISABLE) && rc) {
dev_dbg(&slot->pci_bus->self->dev,"remove failed rc = %d\n", rc);
}
return rc;
}
/*
* Power up and configure the slot via a SAL call to PROM.
* Scan slot (and any children), do any platform specific fixup,
* and find device driver.
*/
static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
{
struct slot *slot = bss_hotplug_slot->private;
struct pci_bus *new_bus = NULL;
struct pci_dev *dev;
int func, num_funcs;
int new_ppb = 0;
int rc;
char *ssdt = NULL;
void pcibios_fixup_device_resources(struct pci_dev *);
/* Serialize the Linux PCI infrastructure */
mutex_lock(&sn_hotplug_mutex);
/*
* Power-on and initialize the slot in the SN
* PCI infrastructure. Also, retrieve the ACPI SSDT
* table for the slot (if ACPI capable PROM).
*/
rc = sn_slot_enable(bss_hotplug_slot, slot->device_num, &ssdt);
if (rc) {
mutex_unlock(&sn_hotplug_mutex);
return rc;
}
if (ssdt)
ssdt = __va(ssdt);
/* Add the new SSDT for the slot to the ACPI namespace */
if (SN_ACPI_BASE_SUPPORT() && ssdt) {
acpi_status ret;
ret = acpi_load_table((struct acpi_table_header *)ssdt);
if (ACPI_FAILURE(ret)) {
printk(KERN_ERR "%s: acpi_load_table failed (0x%x)\n",
__func__, ret);
/* try to continue on */
}
}
num_funcs = pci_scan_slot(slot->pci_bus,
PCI_DEVFN(slot->device_num + 1, 0));
if (!num_funcs) {
dev_dbg(&slot->pci_bus->self->dev, "no device in slot\n");
mutex_unlock(&sn_hotplug_mutex);
return -ENODEV;
}
/*
* Map SN resources for all functions on the card
* to the Linux PCI interface and tell the drivers
* about them.
*/
for (func = 0; func < num_funcs; func++) {
dev = pci_get_slot(slot->pci_bus,
PCI_DEVFN(slot->device_num + 1,
PCI_FUNC(func)));
if (dev) {
/* Need to do slot fixup on PPB before fixup of children
* (PPB's pcidev_info needs to be in pcidev_info list
* before child's SN_PCIDEV_INFO() call to setup
* pdi_host_pcidev_info).
*/
pcibios_fixup_device_resources(dev);
if (SN_ACPI_BASE_SUPPORT())
sn_acpi_slot_fixup(dev);
else
sn_io_slot_fixup(dev);
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
unsigned char sec_bus;
pci_read_config_byte(dev, PCI_SECONDARY_BUS,
&sec_bus);
new_bus = pci_add_new_bus(dev->bus, dev,
sec_bus);
pci_scan_child_bus(new_bus);
new_ppb = 1;
}
pci_dev_put(dev);
}
}
/*
* Add the slot's devices to the ACPI infrastructure */
if (SN_ACPI_BASE_SUPPORT() && ssdt) {
unsigned long long adr;
struct acpi_device *pdevice;
struct acpi_device *device;
acpi_handle phandle;
acpi_handle chandle = NULL;
acpi_handle rethandle;
acpi_status ret;
phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle;
if (acpi_bus_get_device(phandle, &pdevice)) {
dev_dbg(&slot->pci_bus->self->dev,
"no parent device, assuming NULL\n");
pdevice = NULL;
}
/*
* Walk the rootbus node's immediate children looking for
* the slot's device node(s). There can be more than
* one for multifunction devices.
*/
for (;;) {
rethandle = NULL;
ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
phandle, chandle,
&rethandle);
if (ret == AE_NOT_FOUND || rethandle == NULL)
break;
chandle = rethandle;
ret = acpi_evaluate_integer(chandle, METHOD_NAME__ADR,
NULL, &adr);
if (ACPI_SUCCESS(ret) &&
(adr>>16) == (slot->device_num + 1)) {
ret = acpi_bus_add(&device, pdevice, chandle,
ACPI_BUS_TYPE_DEVICE);
if (ACPI_FAILURE(ret)) {
printk(KERN_ERR "%s: acpi_bus_add "
"failed (0x%x) for slot %d "
"func %d\n", __func__,
ret, (int)(adr>>16),
(int)(adr&0xffff));
/* try to continue on */
} else {
acpi_bus_start(device);
}
}
}
}
/* Call the driver for the new device */
pci_bus_add_devices(slot->pci_bus);
/* Call the drivers for the new devices subordinate to PPB */
if (new_ppb)
pci_bus_add_devices(new_bus);
mutex_unlock(&sn_hotplug_mutex);
if (rc == 0)
dev_dbg(&slot->pci_bus->self->dev,
"insert operation successful\n");
else
dev_dbg(&slot->pci_bus->self->dev,
"insert operation failed rc = %d\n", rc);
return rc;
}
static int disable_slot(struct hotplug_slot *bss_hotplug_slot)
{
struct slot *slot = bss_hotplug_slot->private;
struct pci_dev *dev;
int func;
int rc;
acpi_owner_id ssdt_id = 0;
/* Acquire update access to the bus */
mutex_lock(&sn_hotplug_mutex);
/* is it okay to bring this slot down? */
rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
PCI_REQ_SLOT_ELIGIBLE);
if (rc)
goto leaving;
/* free the ACPI resources for the slot */
if (SN_ACPI_BASE_SUPPORT() &&
PCI_CONTROLLER(slot->pci_bus)->acpi_handle) {
unsigned long long adr;
struct acpi_device *device;
acpi_handle phandle;
acpi_handle chandle = NULL;
acpi_handle rethandle;
acpi_status ret;
/* Get the rootbus node pointer */
phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle;
/*
* Walk the rootbus node's immediate children looking for
* the slot's device node(s). There can be more than
* one for multifunction devices.
*/
for (;;) {
rethandle = NULL;
ret = acpi_get_next_object(ACPI_TYPE_DEVICE,
phandle, chandle,
&rethandle);
if (ret == AE_NOT_FOUND || rethandle == NULL)
break;
chandle = rethandle;
ret = acpi_evaluate_integer(chandle,
METHOD_NAME__ADR,
NULL, &adr);
if (ACPI_SUCCESS(ret) &&
(adr>>16) == (slot->device_num + 1)) {
/* retain the owner id */
acpi_get_id(chandle, &ssdt_id);
ret = acpi_bus_get_device(chandle,
&device);
if (ACPI_SUCCESS(ret))
acpi_bus_trim(device, 1);
}
}
}
/* Free the SN resources assigned to the Linux device.*/
for (func = 0; func < 8; func++) {
dev = pci_get_slot(slot->pci_bus,
PCI_DEVFN(slot->device_num + 1,
PCI_FUNC(func)));
if (dev) {
sn_bus_free_data(dev);
pci_remove_bus_device(dev);
pci_dev_put(dev);
}
}
/* Remove the SSDT for the slot from the ACPI namespace */
if (SN_ACPI_BASE_SUPPORT() && ssdt_id) {
acpi_status ret;
ret = acpi_unload_table_id(ssdt_id);
if (ACPI_FAILURE(ret)) {
printk(KERN_ERR "%s: acpi_unload_table_id "
"failed (0x%x) for id %d\n",
__func__, ret, ssdt_id);
/* try to continue on */
}
}
/* free the collected sysdata pointers */
sn_bus_free_sysdata();
/* Deactivate slot */
rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
PCI_REQ_SLOT_DISABLE);
leaving:
/* Release the bus lock */
mutex_unlock(&sn_hotplug_mutex);
return rc;
}
static inline int get_power_status(struct hotplug_slot *bss_hotplug_slot,
u8 *value)
{
struct slot *slot = bss_hotplug_slot->private;
struct pcibus_info *pcibus_info;
u32 power;
pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
mutex_lock(&sn_hotplug_mutex);
power = pcibus_info->pbi_enabled_devices & (1 << slot->device_num);
*value = power ? 1 : 0;
mutex_unlock(&sn_hotplug_mutex);
return 0;
}
static void sn_release_slot(struct hotplug_slot *bss_hotplug_slot)
{
kfree(bss_hotplug_slot->info);
kfree(bss_hotplug_slot->private);
kfree(bss_hotplug_slot);
}
static int sn_hotplug_slot_register(struct pci_bus *pci_bus)
{
int device;
struct pci_slot *pci_slot;
struct hotplug_slot *bss_hotplug_slot;
char name[SN_SLOT_NAME_SIZE];
int rc = 0;
/*
* Currently only four devices are supported,
* in the future there maybe more -- up to 32.
*/
for (device = 0; device < SN_MAX_HP_SLOTS ; device++) {
if (sn_pci_slot_valid(pci_bus, device) != 1)
continue;
bss_hotplug_slot = kzalloc(sizeof(*bss_hotplug_slot),
GFP_KERNEL);
if (!bss_hotplug_slot) {
rc = -ENOMEM;
goto alloc_err;
}
bss_hotplug_slot->info =
kzalloc(sizeof(struct hotplug_slot_info),
GFP_KERNEL);
if (!bss_hotplug_slot->info) {
rc = -ENOMEM;
goto alloc_err;
}
if (sn_hp_slot_private_alloc(bss_hotplug_slot,
pci_bus, device, name)) {
rc = -ENOMEM;
goto alloc_err;
}
bss_hotplug_slot->ops = &sn_hotplug_slot_ops;
bss_hotplug_slot->release = &sn_release_slot;
rc = pci_hp_register(bss_hotplug_slot, pci_bus, device, name);
if (rc)
goto register_err;
pci_slot = bss_hotplug_slot->pci_slot;
rc = sysfs_create_file(&pci_slot->kobj,
&sn_slot_path_attr.attr);
if (rc)
goto register_err;
}
dev_dbg(&pci_bus->self->dev, "Registered bus with hotplug\n");
return rc;
register_err:
dev_dbg(&pci_bus->self->dev, "bus failed to register with err = %d\n",
rc);
alloc_err:
if (rc == -ENOMEM)
dev_dbg(&pci_bus->self->dev, "Memory allocation error\n");
/* destroy THIS element */
if (bss_hotplug_slot)
sn_release_slot(bss_hotplug_slot);
/* destroy anything else on the list */
while ((bss_hotplug_slot = sn_hp_destroy()))
pci_hp_deregister(bss_hotplug_slot);
return rc;
}
static int __init sn_pci_hotplug_init(void)
{
struct pci_bus *pci_bus = NULL;
int rc;
int registered = 0;
if (!sn_prom_feature_available(PRF_HOTPLUG_SUPPORT)) {
printk(KERN_ERR "%s: PROM version does not support hotplug.\n",
__func__);
return -EPERM;
}
INIT_LIST_HEAD(&sn_hp_list);
while ((pci_bus = pci_find_next_bus(pci_bus))) {
if (!pci_bus->sysdata)
continue;
rc = sn_pci_bus_valid(pci_bus);
if (rc != 1) {
dev_dbg(&pci_bus->self->dev, "not a valid hotplug bus\n");
continue;
}
dev_dbg(&pci_bus->self->dev, "valid hotplug bus\n");
rc = sn_hotplug_slot_register(pci_bus);
if (!rc) {
registered = 1;
} else {
registered = 0;
break;
}
}
return registered == 1 ? 0 : -ENODEV;
}
static void __exit sn_pci_hotplug_exit(void)
{
struct hotplug_slot *bss_hotplug_slot;
while ((bss_hotplug_slot = sn_hp_destroy()))
pci_hp_deregister(bss_hotplug_slot);
if (!list_empty(&sn_hp_list))
printk(KERN_ERR "%s: internal list is not empty\n", __FILE__);
}
module_init(sn_pci_hotplug_init);
module_exit(sn_pci_hotplug_exit);
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