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linux/drivers/pci/hotplug/ibmphp_core.c
Lukas Wunner 125450f814 PCI: hotplug: Embed hotplug_slot 
When the PCI hotplug core and its first user, cpqphp, were introduced in
February 2002 with historic commit a8a2069f432c, cpqphp allocated a slot
struct for its internal use plus a hotplug_slot struct to be registered
with the hotplug core and linked the two with pointers:
https://git.kernel.org/tglx/history/c/a8a2069f432c

Nowadays, the predominant pattern in the tree is to embed ("subclass")
such structures in one another and cast to the containing struct with
container_of().  But it wasn't until July 2002 that container_of() was
introduced with historic commit ec4f214232cf:
https://git.kernel.org/tglx/history/c/ec4f214232cf

pnv_php, introduced in 2016, did the right thing and embedded struct
hotplug_slot in its internal struct pnv_php_slot, but all other drivers
cargo-culted cpqphp's design and linked separate structs with pointers.

Embedding structs is preferrable to linking them with pointers because
it requires fewer allocations, thereby reducing overhead and simplifying
error paths.  Casting an embedded struct to the containing struct
becomes a cheap subtraction rather than a dereference.  And having fewer
pointers reduces the risk of them pointing nowhere either accidentally
or due to an attack.

Convert all drivers to embed struct hotplug_slot in their internal slot
struct.  The "private" pointer in struct hotplug_slot thereby becomes
unused, so drop it.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>  # drivers/pci/hotplug/rpa*
Acked-by: Sebastian Ott <sebott@linux.ibm.com>        # drivers/pci/hotplug/s390*
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com> # drivers/platform/x86
Cc: Len Brown <lenb@kernel.org>
Cc: Scott Murray <scott@spiteful.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Oliver OHalloran <oliveroh@au1.ibm.com>
Cc: Gavin Shan <gwshan@linux.vnet.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: Corentin Chary <corentin.chary@gmail.com>
Cc: Darren Hart <dvhart@infradead.org>
2018-09-18 17:52:15 -05:00

1329 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* IBM Hot Plug Controller Driver
*
* Written By: Chuck Cole, Jyoti Shah, Tong Yu, Irene Zubarev, IBM Corporation
*
* Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2001-2003 IBM Corp.
*
* All rights reserved.
*
* Send feedback to <gregkh@us.ibm.com>
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include "../pci.h"
#include <asm/pci_x86.h> /* for struct irq_routing_table */
#include <asm/io_apic.h>
#include "ibmphp.h"
#define attn_on(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_ATTNON)
#define attn_off(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_ATTNOFF)
#define attn_LED_blink(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_BLINKLED)
#define get_ctrl_revision(sl, rev) ibmphp_hpc_readslot(sl, READ_REVLEVEL, rev)
#define get_hpc_options(sl, opt) ibmphp_hpc_readslot(sl, READ_HPCOPTIONS, opt)
#define DRIVER_VERSION "0.6"
#define DRIVER_DESC "IBM Hot Plug PCI Controller Driver"
int ibmphp_debug;
static bool debug;
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRIVER_DESC);
struct pci_bus *ibmphp_pci_bus;
static int max_slots;
static int irqs[16]; /* PIC mode IRQs we're using so far (in case MPS
* tables don't provide default info for empty slots */
static int init_flag;
/*
static int get_max_adapter_speed_1 (struct hotplug_slot *, u8 *, u8);
static inline int get_max_adapter_speed (struct hotplug_slot *hs, u8 *value)
{
return get_max_adapter_speed_1 (hs, value, 1);
}
*/
static inline int get_cur_bus_info(struct slot **sl)
{
int rc = 1;
struct slot *slot_cur = *sl;
debug("options = %x\n", slot_cur->ctrl->options);
debug("revision = %x\n", slot_cur->ctrl->revision);
if (READ_BUS_STATUS(slot_cur->ctrl))
rc = ibmphp_hpc_readslot(slot_cur, READ_BUSSTATUS, NULL);
if (rc)
return rc;
slot_cur->bus_on->current_speed = CURRENT_BUS_SPEED(slot_cur->busstatus);
if (READ_BUS_MODE(slot_cur->ctrl))
slot_cur->bus_on->current_bus_mode =
CURRENT_BUS_MODE(slot_cur->busstatus);
else
slot_cur->bus_on->current_bus_mode = 0xFF;
debug("busstatus = %x, bus_speed = %x, bus_mode = %x\n",
slot_cur->busstatus,
slot_cur->bus_on->current_speed,
slot_cur->bus_on->current_bus_mode);
*sl = slot_cur;
return 0;
}
static inline int slot_update(struct slot **sl)
{
int rc;
rc = ibmphp_hpc_readslot(*sl, READ_ALLSTAT, NULL);
if (rc)
return rc;
if (!init_flag)
rc = get_cur_bus_info(sl);
return rc;
}
static int __init get_max_slots(void)
{
struct slot *slot_cur;
u8 slot_count = 0;
list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
/* sometimes the hot-pluggable slots start with 4 (not always from 1) */
slot_count = max(slot_count, slot_cur->number);
}
return slot_count;
}
/* This routine will put the correct slot->device information per slot. It's
* called from initialization of the slot structures. It will also assign
* interrupt numbers per each slot.
* Parameters: struct slot
* Returns 0 or errors
*/
int ibmphp_init_devno(struct slot **cur_slot)
{
struct irq_routing_table *rtable;
int len;
int loop;
int i;
rtable = pcibios_get_irq_routing_table();
if (!rtable) {
err("no BIOS routing table...\n");
return -ENOMEM;
}
len = (rtable->size - sizeof(struct irq_routing_table)) /
sizeof(struct irq_info);
if (!len) {
kfree(rtable);
return -1;
}
for (loop = 0; loop < len; loop++) {
if ((*cur_slot)->number == rtable->slots[loop].slot &&
(*cur_slot)->bus == rtable->slots[loop].bus) {
(*cur_slot)->device = PCI_SLOT(rtable->slots[loop].devfn);
for (i = 0; i < 4; i++)
(*cur_slot)->irq[i] = IO_APIC_get_PCI_irq_vector((int) (*cur_slot)->bus,
(int) (*cur_slot)->device, i);
debug("(*cur_slot)->irq[0] = %x\n",
(*cur_slot)->irq[0]);
debug("(*cur_slot)->irq[1] = %x\n",
(*cur_slot)->irq[1]);
debug("(*cur_slot)->irq[2] = %x\n",
(*cur_slot)->irq[2]);
debug("(*cur_slot)->irq[3] = %x\n",
(*cur_slot)->irq[3]);
debug("rtable->exclusive_irqs = %x\n",
rtable->exclusive_irqs);
debug("rtable->slots[loop].irq[0].bitmap = %x\n",
rtable->slots[loop].irq[0].bitmap);
debug("rtable->slots[loop].irq[1].bitmap = %x\n",
rtable->slots[loop].irq[1].bitmap);
debug("rtable->slots[loop].irq[2].bitmap = %x\n",
rtable->slots[loop].irq[2].bitmap);
debug("rtable->slots[loop].irq[3].bitmap = %x\n",
rtable->slots[loop].irq[3].bitmap);
debug("rtable->slots[loop].irq[0].link = %x\n",
rtable->slots[loop].irq[0].link);
debug("rtable->slots[loop].irq[1].link = %x\n",
rtable->slots[loop].irq[1].link);
debug("rtable->slots[loop].irq[2].link = %x\n",
rtable->slots[loop].irq[2].link);
debug("rtable->slots[loop].irq[3].link = %x\n",
rtable->slots[loop].irq[3].link);
debug("end of init_devno\n");
kfree(rtable);
return 0;
}
}
kfree(rtable);
return -1;
}
static inline int power_on(struct slot *slot_cur)
{
u8 cmd = HPC_SLOT_ON;
int retval;
retval = ibmphp_hpc_writeslot(slot_cur, cmd);
if (retval) {
err("power on failed\n");
return retval;
}
if (CTLR_RESULT(slot_cur->ctrl->status)) {
err("command not completed successfully in power_on\n");
return -EIO;
}
msleep(3000); /* For ServeRAID cards, and some 66 PCI */
return 0;
}
static inline int power_off(struct slot *slot_cur)
{
u8 cmd = HPC_SLOT_OFF;
int retval;
retval = ibmphp_hpc_writeslot(slot_cur, cmd);
if (retval) {
err("power off failed\n");
return retval;
}
if (CTLR_RESULT(slot_cur->ctrl->status)) {
err("command not completed successfully in power_off\n");
retval = -EIO;
}
return retval;
}
static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
{
int rc = 0;
struct slot *pslot;
u8 cmd = 0x00; /* avoid compiler warning */
debug("set_attention_status - Entry hotplug_slot[%lx] value[%x]\n",
(ulong) hotplug_slot, value);
ibmphp_lock_operations();
if (hotplug_slot) {
switch (value) {
case HPC_SLOT_ATTN_OFF:
cmd = HPC_SLOT_ATTNOFF;
break;
case HPC_SLOT_ATTN_ON:
cmd = HPC_SLOT_ATTNON;
break;
case HPC_SLOT_ATTN_BLINK:
cmd = HPC_SLOT_BLINKLED;
break;
default:
rc = -ENODEV;
err("set_attention_status - Error : invalid input [%x]\n",
value);
break;
}
if (rc == 0) {
pslot = to_slot(hotplug_slot);
rc = ibmphp_hpc_writeslot(pslot, cmd);
}
} else
rc = -ENODEV;
ibmphp_unlock_operations();
debug("set_attention_status - Exit rc[%d]\n", rc);
return rc;
}
static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
int rc = -ENODEV;
struct slot *pslot;
struct slot myslot;
debug("get_attention_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
(ulong) hotplug_slot, (ulong) value);
ibmphp_lock_operations();
if (hotplug_slot) {
pslot = to_slot(hotplug_slot);
memcpy(&myslot, pslot, sizeof(struct slot));
rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
&myslot.status);
if (!rc)
rc = ibmphp_hpc_readslot(pslot, READ_EXTSLOTSTATUS,
&myslot.ext_status);
if (!rc)
*value = SLOT_ATTN(myslot.status, myslot.ext_status);
}
ibmphp_unlock_operations();
debug("get_attention_status - Exit rc[%d] value[%x]\n", rc, *value);
return rc;
}
static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
int rc = -ENODEV;
struct slot *pslot;
struct slot myslot;
debug("get_latch_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
(ulong) hotplug_slot, (ulong) value);
ibmphp_lock_operations();
if (hotplug_slot) {
pslot = to_slot(hotplug_slot);
memcpy(&myslot, pslot, sizeof(struct slot));
rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
&myslot.status);
if (!rc)
*value = SLOT_LATCH(myslot.status);
}
ibmphp_unlock_operations();
debug("get_latch_status - Exit rc[%d] rc[%x] value[%x]\n",
rc, rc, *value);
return rc;
}
static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
int rc = -ENODEV;
struct slot *pslot;
struct slot myslot;
debug("get_power_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
(ulong) hotplug_slot, (ulong) value);
ibmphp_lock_operations();
if (hotplug_slot) {
pslot = to_slot(hotplug_slot);
memcpy(&myslot, pslot, sizeof(struct slot));
rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
&myslot.status);
if (!rc)
*value = SLOT_PWRGD(myslot.status);
}
ibmphp_unlock_operations();
debug("get_power_status - Exit rc[%d] rc[%x] value[%x]\n",
rc, rc, *value);
return rc;
}
static int get_adapter_present(struct hotplug_slot *hotplug_slot, u8 *value)
{
int rc = -ENODEV;
struct slot *pslot;
u8 present;
struct slot myslot;
debug("get_adapter_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
(ulong) hotplug_slot, (ulong) value);
ibmphp_lock_operations();
if (hotplug_slot) {
pslot = to_slot(hotplug_slot);
memcpy(&myslot, pslot, sizeof(struct slot));
rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
&myslot.status);
if (!rc) {
present = SLOT_PRESENT(myslot.status);
if (present == HPC_SLOT_EMPTY)
*value = 0;
else
*value = 1;
}
}
ibmphp_unlock_operations();
debug("get_adapter_present - Exit rc[%d] value[%x]\n", rc, *value);
return rc;
}
static int get_max_bus_speed(struct slot *slot)
{
int rc = 0;
u8 mode = 0;
enum pci_bus_speed speed;
struct pci_bus *bus = slot->hotplug_slot.pci_slot->bus;
debug("%s - Entry slot[%p]\n", __func__, slot);
ibmphp_lock_operations();
mode = slot->supported_bus_mode;
speed = slot->supported_speed;
ibmphp_unlock_operations();
switch (speed) {
case BUS_SPEED_33:
break;
case BUS_SPEED_66:
if (mode == BUS_MODE_PCIX)
speed += 0x01;
break;
case BUS_SPEED_100:
case BUS_SPEED_133:
speed += 0x01;
break;
default:
/* Note (will need to change): there would be soon 256, 512 also */
rc = -ENODEV;
}
if (!rc)
bus->max_bus_speed = speed;
debug("%s - Exit rc[%d] speed[%x]\n", __func__, rc, speed);
return rc;
}
/*
static int get_max_adapter_speed_1(struct hotplug_slot *hotplug_slot, u8 *value, u8 flag)
{
int rc = -ENODEV;
struct slot *pslot;
struct slot myslot;
debug("get_max_adapter_speed_1 - Entry hotplug_slot[%lx] pvalue[%lx]\n",
(ulong)hotplug_slot, (ulong) value);
if (flag)
ibmphp_lock_operations();
if (hotplug_slot && value) {
pslot = hotplug_slot->private;
if (pslot) {
memcpy(&myslot, pslot, sizeof(struct slot));
rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
&(myslot.status));
if (!(SLOT_LATCH (myslot.status)) &&
(SLOT_PRESENT (myslot.status))) {
rc = ibmphp_hpc_readslot(pslot,
READ_EXTSLOTSTATUS,
&(myslot.ext_status));
if (!rc)
*value = SLOT_SPEED(myslot.ext_status);
} else
*value = MAX_ADAPTER_NONE;
}
}
if (flag)
ibmphp_unlock_operations();
debug("get_max_adapter_speed_1 - Exit rc[%d] value[%x]\n", rc, *value);
return rc;
}
static int get_bus_name(struct hotplug_slot *hotplug_slot, char *value)
{
int rc = -ENODEV;
struct slot *pslot = NULL;
debug("get_bus_name - Entry hotplug_slot[%lx]\n", (ulong)hotplug_slot);
ibmphp_lock_operations();
if (hotplug_slot) {
pslot = hotplug_slot->private;
if (pslot) {
rc = 0;
snprintf(value, 100, "Bus %x", pslot->bus);
}
} else
rc = -ENODEV;
ibmphp_unlock_operations();
debug("get_bus_name - Exit rc[%d] value[%x]\n", rc, *value);
return rc;
}
*/
/****************************************************************************
* This routine will initialize the ops data structure used in the validate
* function. It will also power off empty slots that are powered on since BIOS
* leaves those on, albeit disconnected
****************************************************************************/
static int __init init_ops(void)
{
struct slot *slot_cur;
int retval;
int rc;
list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
debug("BEFORE GETTING SLOT STATUS, slot # %x\n",
slot_cur->number);
if (slot_cur->ctrl->revision == 0xFF)
if (get_ctrl_revision(slot_cur,
&slot_cur->ctrl->revision))
return -1;
if (slot_cur->bus_on->current_speed == 0xFF)
if (get_cur_bus_info(&slot_cur))
return -1;
get_max_bus_speed(slot_cur);
if (slot_cur->ctrl->options == 0xFF)
if (get_hpc_options(slot_cur, &slot_cur->ctrl->options))
return -1;
retval = slot_update(&slot_cur);
if (retval)
return retval;
debug("status = %x\n", slot_cur->status);
debug("ext_status = %x\n", slot_cur->ext_status);
debug("SLOT_POWER = %x\n", SLOT_POWER(slot_cur->status));
debug("SLOT_PRESENT = %x\n", SLOT_PRESENT(slot_cur->status));
debug("SLOT_LATCH = %x\n", SLOT_LATCH(slot_cur->status));
if ((SLOT_PWRGD(slot_cur->status)) &&
!(SLOT_PRESENT(slot_cur->status)) &&
!(SLOT_LATCH(slot_cur->status))) {
debug("BEFORE POWER OFF COMMAND\n");
rc = power_off(slot_cur);
if (rc)
return rc;
/* retval = slot_update(&slot_cur);
* if (retval)
* return retval;
* ibmphp_update_slot_info(slot_cur);
*/
}
}
init_flag = 0;
return 0;
}
/* This operation will check whether the slot is within the bounds and
* the operation is valid to perform on that slot
* Parameters: slot, operation
* Returns: 0 or error codes
*/
static int validate(struct slot *slot_cur, int opn)
{
int number;
int retval;
if (!slot_cur)
return -ENODEV;
number = slot_cur->number;
if ((number > max_slots) || (number < 0))
return -EBADSLT;
debug("slot_number in validate is %d\n", slot_cur->number);
retval = slot_update(&slot_cur);
if (retval)
return retval;
switch (opn) {
case ENABLE:
if (!(SLOT_PWRGD(slot_cur->status)) &&
(SLOT_PRESENT(slot_cur->status)) &&
!(SLOT_LATCH(slot_cur->status)))
return 0;
break;
case DISABLE:
if ((SLOT_PWRGD(slot_cur->status)) &&
(SLOT_PRESENT(slot_cur->status)) &&
!(SLOT_LATCH(slot_cur->status)))
return 0;
break;
default:
break;
}
err("validate failed....\n");
return -EINVAL;
}
/****************************************************************************
* This routine is for updating the data structures in the hotplug core
* Parameters: struct slot
* Returns: 0 or error
****************************************************************************/
int ibmphp_update_slot_info(struct slot *slot_cur)
{
struct pci_bus *bus = slot_cur->hotplug_slot.pci_slot->bus;
u8 bus_speed;
u8 mode;
bus_speed = slot_cur->bus_on->current_speed;
mode = slot_cur->bus_on->current_bus_mode;
switch (bus_speed) {
case BUS_SPEED_33:
break;
case BUS_SPEED_66:
if (mode == BUS_MODE_PCIX)
bus_speed += 0x01;
else if (mode == BUS_MODE_PCI)
;
else
bus_speed = PCI_SPEED_UNKNOWN;
break;
case BUS_SPEED_100:
case BUS_SPEED_133:
bus_speed += 0x01;
break;
default:
bus_speed = PCI_SPEED_UNKNOWN;
}
bus->cur_bus_speed = bus_speed;
// To do: bus_names
return 0;
}
/******************************************************************************
* This function will return the pci_func, given bus and devfunc, or NULL. It
* is called from visit routines
******************************************************************************/
static struct pci_func *ibm_slot_find(u8 busno, u8 device, u8 function)
{
struct pci_func *func_cur;
struct slot *slot_cur;
list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
if (slot_cur->func) {
func_cur = slot_cur->func;
while (func_cur) {
if ((func_cur->busno == busno) &&
(func_cur->device == device) &&
(func_cur->function == function))
return func_cur;
func_cur = func_cur->next;
}
}
}
return NULL;
}
/*************************************************************
* This routine frees up memory used by struct slot, including
* the pointers to pci_func, bus, hotplug_slot, controller,
* and deregistering from the hotplug core
*************************************************************/
static void free_slots(void)
{
struct slot *slot_cur, *next;
debug("%s -- enter\n", __func__);
list_for_each_entry_safe(slot_cur, next, &ibmphp_slot_head,
ibm_slot_list) {
pci_hp_del(&slot_cur->hotplug_slot);
slot_cur->ctrl = NULL;
slot_cur->bus_on = NULL;
/*
* We don't want to actually remove the resources,
* since ibmphp_free_resources() will do just that.
*/
ibmphp_unconfigure_card(&slot_cur, -1);
pci_hp_destroy(&slot_cur->hotplug_slot);
kfree(slot_cur);
}
debug("%s -- exit\n", __func__);
}
static void ibm_unconfigure_device(struct pci_func *func)
{
struct pci_dev *temp;
u8 j;
debug("inside %s\n", __func__);
debug("func->device = %x, func->function = %x\n",
func->device, func->function);
debug("func->device << 3 | 0x0 = %x\n", func->device << 3 | 0x0);
pci_lock_rescan_remove();
for (j = 0; j < 0x08; j++) {
temp = pci_get_domain_bus_and_slot(0, func->busno,
(func->device << 3) | j);
if (temp) {
pci_stop_and_remove_bus_device(temp);
pci_dev_put(temp);
}
}
pci_dev_put(func->dev);
pci_unlock_rescan_remove();
}
/*
* The following function is to fix kernel bug regarding
* getting bus entries, here we manually add those primary
* bus entries to kernel bus structure whenever apply
*/
static u8 bus_structure_fixup(u8 busno)
{
struct pci_bus *bus, *b;
struct pci_dev *dev;
u16 l;
if (pci_find_bus(0, busno) || !(ibmphp_find_same_bus_num(busno)))
return 1;
bus = kmalloc(sizeof(*bus), GFP_KERNEL);
if (!bus)
return 1;
dev = kmalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
kfree(bus);
return 1;
}
bus->number = busno;
bus->ops = ibmphp_pci_bus->ops;
dev->bus = bus;
for (dev->devfn = 0; dev->devfn < 256; dev->devfn += 8) {
if (!pci_read_config_word(dev, PCI_VENDOR_ID, &l) &&
(l != 0x0000) && (l != 0xffff)) {
debug("%s - Inside bus_structure_fixup()\n",
__func__);
b = pci_scan_bus(busno, ibmphp_pci_bus->ops, NULL);
if (!b)
continue;
pci_bus_add_devices(b);
break;
}
}
kfree(dev);
kfree(bus);
return 0;
}
static int ibm_configure_device(struct pci_func *func)
{
struct pci_bus *child;
int num;
int flag = 0; /* this is to make sure we don't double scan the bus,
for bridged devices primarily */
pci_lock_rescan_remove();
if (!(bus_structure_fixup(func->busno)))
flag = 1;
if (func->dev == NULL)
func->dev = pci_get_domain_bus_and_slot(0, func->busno,
PCI_DEVFN(func->device, func->function));
if (func->dev == NULL) {
struct pci_bus *bus = pci_find_bus(0, func->busno);
if (!bus)
goto out;
num = pci_scan_slot(bus,
PCI_DEVFN(func->device, func->function));
if (num)
pci_bus_add_devices(bus);
func->dev = pci_get_domain_bus_and_slot(0, func->busno,
PCI_DEVFN(func->device, func->function));
if (func->dev == NULL) {
err("ERROR... : pci_dev still NULL\n");
goto out;
}
}
if (!(flag) && (func->dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)) {
pci_hp_add_bridge(func->dev);
child = func->dev->subordinate;
if (child)
pci_bus_add_devices(child);
}
out:
pci_unlock_rescan_remove();
return 0;
}
/*******************************************************
* Returns whether the bus is empty or not
*******************************************************/
static int is_bus_empty(struct slot *slot_cur)
{
int rc;
struct slot *tmp_slot;
u8 i = slot_cur->bus_on->slot_min;
while (i <= slot_cur->bus_on->slot_max) {
if (i == slot_cur->number) {
i++;
continue;
}
tmp_slot = ibmphp_get_slot_from_physical_num(i);
if (!tmp_slot)
return 0;
rc = slot_update(&tmp_slot);
if (rc)
return 0;
if (SLOT_PRESENT(tmp_slot->status) &&
SLOT_PWRGD(tmp_slot->status))
return 0;
i++;
}
return 1;
}
/***********************************************************
* If the HPC permits and the bus currently empty, tries to set the
* bus speed and mode at the maximum card and bus capability
* Parameters: slot
* Returns: bus is set (0) or error code
***********************************************************/
static int set_bus(struct slot *slot_cur)
{
int rc;
u8 speed;
u8 cmd = 0x0;
int retval;
static const struct pci_device_id ciobx[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, 0x0101) },
{ },
};
debug("%s - entry slot # %d\n", __func__, slot_cur->number);
if (SET_BUS_STATUS(slot_cur->ctrl) && is_bus_empty(slot_cur)) {
rc = slot_update(&slot_cur);
if (rc)
return rc;
speed = SLOT_SPEED(slot_cur->ext_status);
debug("ext_status = %x, speed = %x\n", slot_cur->ext_status, speed);
switch (speed) {
case HPC_SLOT_SPEED_33:
cmd = HPC_BUS_33CONVMODE;
break;
case HPC_SLOT_SPEED_66:
if (SLOT_PCIX(slot_cur->ext_status)) {
if ((slot_cur->supported_speed >= BUS_SPEED_66) &&
(slot_cur->supported_bus_mode == BUS_MODE_PCIX))
cmd = HPC_BUS_66PCIXMODE;
else if (!SLOT_BUS_MODE(slot_cur->ext_status))
/* if max slot/bus capability is 66 pci
and there's no bus mode mismatch, then
the adapter supports 66 pci */
cmd = HPC_BUS_66CONVMODE;
else
cmd = HPC_BUS_33CONVMODE;
} else {
if (slot_cur->supported_speed >= BUS_SPEED_66)
cmd = HPC_BUS_66CONVMODE;
else
cmd = HPC_BUS_33CONVMODE;
}
break;
case HPC_SLOT_SPEED_133:
switch (slot_cur->supported_speed) {
case BUS_SPEED_33:
cmd = HPC_BUS_33CONVMODE;
break;
case BUS_SPEED_66:
if (slot_cur->supported_bus_mode == BUS_MODE_PCIX)
cmd = HPC_BUS_66PCIXMODE;
else
cmd = HPC_BUS_66CONVMODE;
break;
case BUS_SPEED_100:
cmd = HPC_BUS_100PCIXMODE;
break;
case BUS_SPEED_133:
/* This is to take care of the bug in CIOBX chip */
if (pci_dev_present(ciobx))
ibmphp_hpc_writeslot(slot_cur,
HPC_BUS_100PCIXMODE);
cmd = HPC_BUS_133PCIXMODE;
break;
default:
err("Wrong bus speed\n");
return -ENODEV;
}
break;
default:
err("wrong slot speed\n");
return -ENODEV;
}
debug("setting bus speed for slot %d, cmd %x\n",
slot_cur->number, cmd);
retval = ibmphp_hpc_writeslot(slot_cur, cmd);
if (retval) {
err("setting bus speed failed\n");
return retval;
}
if (CTLR_RESULT(slot_cur->ctrl->status)) {
err("command not completed successfully in set_bus\n");
return -EIO;
}
}
/* This is for x440, once Brandon fixes the firmware,
will not need this delay */
msleep(1000);
debug("%s -Exit\n", __func__);
return 0;
}
/* This routine checks the bus limitations that the slot is on from the BIOS.
* This is used in deciding whether or not to power up the slot.
* (electrical/spec limitations. For example, >1 133 MHz or >2 66 PCI cards on
* same bus)
* Parameters: slot
* Returns: 0 = no limitations, -EINVAL = exceeded limitations on the bus
*/
static int check_limitations(struct slot *slot_cur)
{
u8 i;
struct slot *tmp_slot;
u8 count = 0;
u8 limitation = 0;
for (i = slot_cur->bus_on->slot_min; i <= slot_cur->bus_on->slot_max; i++) {
tmp_slot = ibmphp_get_slot_from_physical_num(i);
if (!tmp_slot)
return -ENODEV;
if ((SLOT_PWRGD(tmp_slot->status)) &&
!(SLOT_CONNECT(tmp_slot->status)))
count++;
}
get_cur_bus_info(&slot_cur);
switch (slot_cur->bus_on->current_speed) {
case BUS_SPEED_33:
limitation = slot_cur->bus_on->slots_at_33_conv;
break;
case BUS_SPEED_66:
if (slot_cur->bus_on->current_bus_mode == BUS_MODE_PCIX)
limitation = slot_cur->bus_on->slots_at_66_pcix;
else
limitation = slot_cur->bus_on->slots_at_66_conv;
break;
case BUS_SPEED_100:
limitation = slot_cur->bus_on->slots_at_100_pcix;
break;
case BUS_SPEED_133:
limitation = slot_cur->bus_on->slots_at_133_pcix;
break;
}
if ((count + 1) > limitation)
return -EINVAL;
return 0;
}
static inline void print_card_capability(struct slot *slot_cur)
{
info("capability of the card is ");
if ((slot_cur->ext_status & CARD_INFO) == PCIX133)
info(" 133 MHz PCI-X\n");
else if ((slot_cur->ext_status & CARD_INFO) == PCIX66)
info(" 66 MHz PCI-X\n");
else if ((slot_cur->ext_status & CARD_INFO) == PCI66)
info(" 66 MHz PCI\n");
else
info(" 33 MHz PCI\n");
}
/* This routine will power on the slot, configure the device(s) and find the
* drivers for them.
* Parameters: hotplug_slot
* Returns: 0 or failure codes
*/
static int enable_slot(struct hotplug_slot *hs)
{
int rc, i, rcpr;
struct slot *slot_cur;
u8 function;
struct pci_func *tmp_func;
ibmphp_lock_operations();
debug("ENABLING SLOT........\n");
slot_cur = to_slot(hs);
rc = validate(slot_cur, ENABLE);
if (rc) {
err("validate function failed\n");
goto error_nopower;
}
attn_LED_blink(slot_cur);
rc = set_bus(slot_cur);
if (rc) {
err("was not able to set the bus\n");
goto error_nopower;
}
/*-----------------debugging------------------------------*/
get_cur_bus_info(&slot_cur);
debug("the current bus speed right after set_bus = %x\n",
slot_cur->bus_on->current_speed);
/*----------------------------------------------------------*/
rc = check_limitations(slot_cur);
if (rc) {
err("Adding this card exceeds the limitations of this bus.\n");
err("(i.e., >1 133MHz cards running on same bus, or >2 66 PCI cards running on same bus.\n");
err("Try hot-adding into another bus\n");
rc = -EINVAL;
goto error_nopower;
}
rc = power_on(slot_cur);
if (rc) {
err("something wrong when powering up... please see below for details\n");
/* need to turn off before on, otherwise, blinking overwrites */
attn_off(slot_cur);
attn_on(slot_cur);
if (slot_update(&slot_cur)) {
attn_off(slot_cur);
attn_on(slot_cur);
rc = -ENODEV;
goto exit;
}
/* Check to see the error of why it failed */
if ((SLOT_POWER(slot_cur->status)) &&
!(SLOT_PWRGD(slot_cur->status)))
err("power fault occurred trying to power up\n");
else if (SLOT_BUS_SPEED(slot_cur->status)) {
err("bus speed mismatch occurred. please check current bus speed and card capability\n");
print_card_capability(slot_cur);
} else if (SLOT_BUS_MODE(slot_cur->ext_status)) {
err("bus mode mismatch occurred. please check current bus mode and card capability\n");
print_card_capability(slot_cur);
}
ibmphp_update_slot_info(slot_cur);
goto exit;
}
debug("after power_on\n");
/*-----------------------debugging---------------------------*/
get_cur_bus_info(&slot_cur);
debug("the current bus speed right after power_on = %x\n",
slot_cur->bus_on->current_speed);
/*----------------------------------------------------------*/
rc = slot_update(&slot_cur);
if (rc)
goto error_power;
rc = -EINVAL;
if (SLOT_POWER(slot_cur->status) && !(SLOT_PWRGD(slot_cur->status))) {
err("power fault occurred trying to power up...\n");
goto error_power;
}
if (SLOT_POWER(slot_cur->status) && (SLOT_BUS_SPEED(slot_cur->status))) {
err("bus speed mismatch occurred. please check current bus speed and card capability\n");
print_card_capability(slot_cur);
goto error_power;
}
/* Don't think this case will happen after above checks...
* but just in case, for paranoia sake */
if (!(SLOT_POWER(slot_cur->status))) {
err("power on failed...\n");
goto error_power;
}
slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL);
if (!slot_cur->func) {
/* do update_slot_info here? */
rc = -ENOMEM;
goto error_power;
}
slot_cur->func->busno = slot_cur->bus;
slot_cur->func->device = slot_cur->device;
for (i = 0; i < 4; i++)
slot_cur->func->irq[i] = slot_cur->irq[i];
debug("b4 configure_card, slot_cur->bus = %x, slot_cur->device = %x\n",
slot_cur->bus, slot_cur->device);
if (ibmphp_configure_card(slot_cur->func, slot_cur->number)) {
err("configure_card was unsuccessful...\n");
/* true because don't need to actually deallocate resources,
* just remove references */
ibmphp_unconfigure_card(&slot_cur, 1);
debug("after unconfigure_card\n");
slot_cur->func = NULL;
rc = -ENOMEM;
goto error_power;
}
function = 0x00;
do {
tmp_func = ibm_slot_find(slot_cur->bus, slot_cur->func->device,
function++);
if (tmp_func && !(tmp_func->dev))
ibm_configure_device(tmp_func);
} while (tmp_func);
attn_off(slot_cur);
if (slot_update(&slot_cur)) {
rc = -EFAULT;
goto exit;
}
ibmphp_print_test();
rc = ibmphp_update_slot_info(slot_cur);
exit:
ibmphp_unlock_operations();
return rc;
error_nopower:
attn_off(slot_cur); /* need to turn off if was blinking b4 */
attn_on(slot_cur);
error_cont:
rcpr = slot_update(&slot_cur);
if (rcpr) {
rc = rcpr;
goto exit;
}
ibmphp_update_slot_info(slot_cur);
goto exit;
error_power:
attn_off(slot_cur); /* need to turn off if was blinking b4 */
attn_on(slot_cur);
rcpr = power_off(slot_cur);
if (rcpr) {
rc = rcpr;
goto exit;
}
goto error_cont;
}
/**************************************************************
* HOT REMOVING ADAPTER CARD *
* INPUT: POINTER TO THE HOTPLUG SLOT STRUCTURE *
* OUTPUT: SUCCESS 0 ; FAILURE: UNCONFIGURE , VALIDATE *
* DISABLE POWER , *
**************************************************************/
static int ibmphp_disable_slot(struct hotplug_slot *hotplug_slot)
{
struct slot *slot = to_slot(hotplug_slot);
int rc;
ibmphp_lock_operations();
rc = ibmphp_do_disable_slot(slot);
ibmphp_unlock_operations();
return rc;
}
int ibmphp_do_disable_slot(struct slot *slot_cur)
{
int rc;
u8 flag;
debug("DISABLING SLOT...\n");
if ((slot_cur == NULL) || (slot_cur->ctrl == NULL))
return -ENODEV;
flag = slot_cur->flag;
slot_cur->flag = 1;
if (flag == 1) {
rc = validate(slot_cur, DISABLE);
/* checking if powered off already & valid slot # */
if (rc)
goto error;
}
attn_LED_blink(slot_cur);
if (slot_cur->func == NULL) {
/* We need this for functions that were there on bootup */
slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL);
if (!slot_cur->func) {
rc = -ENOMEM;
goto error;
}
slot_cur->func->busno = slot_cur->bus;
slot_cur->func->device = slot_cur->device;
}
ibm_unconfigure_device(slot_cur->func);
/*
* If we got here from latch suddenly opening on operating card or
* a power fault, there's no power to the card, so cannot
* read from it to determine what resources it occupied. This operation
* is forbidden anyhow. The best we can do is remove it from kernel
* lists at least */
if (!flag) {
attn_off(slot_cur);
return 0;
}
rc = ibmphp_unconfigure_card(&slot_cur, 0);
slot_cur->func = NULL;
debug("in disable_slot. after unconfigure_card\n");
if (rc) {
err("could not unconfigure card.\n");
goto error;
}
rc = ibmphp_hpc_writeslot(slot_cur, HPC_SLOT_OFF);
if (rc)
goto error;
attn_off(slot_cur);
rc = slot_update(&slot_cur);
if (rc)
goto exit;
rc = ibmphp_update_slot_info(slot_cur);
ibmphp_print_test();
exit:
return rc;
error:
/* Need to turn off if was blinking b4 */
attn_off(slot_cur);
attn_on(slot_cur);
if (slot_update(&slot_cur)) {
rc = -EFAULT;
goto exit;
}
if (flag)
ibmphp_update_slot_info(slot_cur);
goto exit;
}
const struct hotplug_slot_ops ibmphp_hotplug_slot_ops = {
.set_attention_status = set_attention_status,
.enable_slot = enable_slot,
.disable_slot = ibmphp_disable_slot,
.hardware_test = NULL,
.get_power_status = get_power_status,
.get_attention_status = get_attention_status,
.get_latch_status = get_latch_status,
.get_adapter_status = get_adapter_present,
/* .get_max_adapter_speed = get_max_adapter_speed,
.get_bus_name_status = get_bus_name,
*/
};
static void ibmphp_unload(void)
{
free_slots();
debug("after slots\n");
ibmphp_free_resources();
debug("after resources\n");
ibmphp_free_bus_info_queue();
debug("after bus info\n");
ibmphp_free_ebda_hpc_queue();
debug("after ebda hpc\n");
ibmphp_free_ebda_pci_rsrc_queue();
debug("after ebda pci rsrc\n");
kfree(ibmphp_pci_bus);
}
static int __init ibmphp_init(void)
{
struct pci_bus *bus;
int i = 0;
int rc = 0;
init_flag = 1;
info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
ibmphp_pci_bus = kmalloc(sizeof(*ibmphp_pci_bus), GFP_KERNEL);
if (!ibmphp_pci_bus) {
rc = -ENOMEM;
goto exit;
}
bus = pci_find_bus(0, 0);
if (!bus) {
err("Can't find the root pci bus, can not continue\n");
rc = -ENODEV;
goto error;
}
memcpy(ibmphp_pci_bus, bus, sizeof(*ibmphp_pci_bus));
ibmphp_debug = debug;
ibmphp_hpc_initvars();
for (i = 0; i < 16; i++)
irqs[i] = 0;
rc = ibmphp_access_ebda();
if (rc)
goto error;
debug("after ibmphp_access_ebda()\n");
rc = ibmphp_rsrc_init();
if (rc)
goto error;
debug("AFTER Resource & EBDA INITIALIZATIONS\n");
max_slots = get_max_slots();
rc = ibmphp_register_pci();
if (rc)
goto error;
if (init_ops()) {
rc = -ENODEV;
goto error;
}
ibmphp_print_test();
rc = ibmphp_hpc_start_poll_thread();
if (rc)
goto error;
exit:
return rc;
error:
ibmphp_unload();
goto exit;
}
static void __exit ibmphp_exit(void)
{
ibmphp_hpc_stop_poll_thread();
debug("after polling\n");
ibmphp_unload();
debug("done\n");
}
module_init(ibmphp_init);
module_exit(ibmphp_exit);
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