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linux_dsm_epyc7002/drivers/pci/hotplug/cpci_hotplug_pci.c
Dan Carpenter bc3b5b47c8 PCI: cpcihp: Add missing curly braces in cpci_configure_slot() 
I don't have this hardware but it looks like we weren't adding bridge
devices as intended.  Maybe the bridge is always the last device?

Fixes: 05b1250048 ("PCI: cpcihp: Iterate over all devices in slot, not functions 0-7")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yijing Wang <wangyijing@huawei.com>
CC: stable@vger.kernel.org	# v3.9+
2015-03-12 11:22:10 -05:00

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7.1 KiB
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/*
* CompactPCI Hot Plug Driver PCI functions
*
* Copyright (C) 2002,2005 by SOMA Networks, Inc.
*
* All rights reserved.
*
* 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.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Send feedback to <scottm@somanetworks.com>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/proc_fs.h>
#include "../pci.h"
#include "cpci_hotplug.h"
#define MY_NAME "cpci_hotplug"
extern int cpci_debug;
#define dbg(format, arg...) \
do { \
if (cpci_debug) \
printk (KERN_DEBUG "%s: " format "\n", \
MY_NAME , ## arg); \
} while (0)
#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
u8 cpci_get_attention_status(struct slot *slot)
{
int hs_cap;
u16 hs_csr;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if (!hs_cap)
return 0;
if (pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr))
return 0;
return hs_csr & 0x0008 ? 1 : 0;
}
int cpci_set_attention_status(struct slot *slot, int status)
{
int hs_cap;
u16 hs_csr;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if (!hs_cap)
return 0;
if (pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr))
return 0;
if (status)
hs_csr |= HS_CSR_LOO;
else
hs_csr &= ~HS_CSR_LOO;
if (pci_bus_write_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
hs_csr))
return 0;
return 1;
}
u16 cpci_get_hs_csr(struct slot *slot)
{
int hs_cap;
u16 hs_csr;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if (!hs_cap)
return 0xFFFF;
if (pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr))
return 0xFFFF;
return hs_csr;
}
int cpci_check_and_clear_ins(struct slot *slot)
{
int hs_cap;
u16 hs_csr;
int ins = 0;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if (!hs_cap)
return 0;
if (pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr))
return 0;
if (hs_csr & HS_CSR_INS) {
/* Clear INS (by setting it) */
if (pci_bus_write_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
hs_csr))
ins = 0;
else
ins = 1;
}
return ins;
}
int cpci_check_ext(struct slot *slot)
{
int hs_cap;
u16 hs_csr;
int ext = 0;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if (!hs_cap)
return 0;
if (pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr))
return 0;
if (hs_csr & HS_CSR_EXT)
ext = 1;
return ext;
}
int cpci_clear_ext(struct slot *slot)
{
int hs_cap;
u16 hs_csr;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if (!hs_cap)
return -ENODEV;
if (pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr))
return -ENODEV;
if (hs_csr & HS_CSR_EXT) {
/* Clear EXT (by setting it) */
if (pci_bus_write_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
hs_csr))
return -ENODEV;
}
return 0;
}
int cpci_led_on(struct slot *slot)
{
int hs_cap;
u16 hs_csr;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if (!hs_cap)
return -ENODEV;
if (pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr))
return -ENODEV;
if ((hs_csr & HS_CSR_LOO) != HS_CSR_LOO) {
hs_csr |= HS_CSR_LOO;
if (pci_bus_write_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
hs_csr)) {
err("Could not set LOO for slot %s",
hotplug_slot_name(slot->hotplug_slot));
return -ENODEV;
}
}
return 0;
}
int cpci_led_off(struct slot *slot)
{
int hs_cap;
u16 hs_csr;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if (!hs_cap)
return -ENODEV;
if (pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr))
return -ENODEV;
if (hs_csr & HS_CSR_LOO) {
hs_csr &= ~HS_CSR_LOO;
if (pci_bus_write_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
hs_csr)) {
err("Could not clear LOO for slot %s",
hotplug_slot_name(slot->hotplug_slot));
return -ENODEV;
}
}
return 0;
}
/*
* Device configuration functions
*/
int cpci_configure_slot(struct slot *slot)
{
struct pci_dev *dev;
struct pci_bus *parent;
int ret = 0;
dbg("%s - enter", __func__);
pci_lock_rescan_remove();
if (slot->dev == NULL) {
dbg("pci_dev null, finding %02x:%02x:%x",
slot->bus->number, PCI_SLOT(slot->devfn), PCI_FUNC(slot->devfn));
slot->dev = pci_get_slot(slot->bus, slot->devfn);
}
/* Still NULL? Well then scan for it! */
if (slot->dev == NULL) {
int n;
dbg("pci_dev still null");
/*
* This will generate pci_dev structures for all functions, but
* we will only call this case when lookup fails.
*/
n = pci_scan_slot(slot->bus, slot->devfn);
dbg("%s: pci_scan_slot returned %d", __func__, n);
slot->dev = pci_get_slot(slot->bus, slot->devfn);
if (slot->dev == NULL) {
err("Could not find PCI device for slot %02x", slot->number);
ret = -ENODEV;
goto out;
}
}
parent = slot->dev->bus;
list_for_each_entry(dev, &parent->devices, bus_list) {
if (PCI_SLOT(dev->devfn) != PCI_SLOT(slot->devfn))
continue;
if (pci_is_bridge(dev))
pci_hp_add_bridge(dev);
}
pci_assign_unassigned_bridge_resources(parent->self);
pci_bus_add_devices(parent);
out:
pci_unlock_rescan_remove();
dbg("%s - exit", __func__);
return ret;
}
int cpci_unconfigure_slot(struct slot *slot)
{
struct pci_dev *dev, *temp;
dbg("%s - enter", __func__);
if (!slot->dev) {
err("No device for slot %02x\n", slot->number);
return -ENODEV;
}
pci_lock_rescan_remove();
list_for_each_entry_safe(dev, temp, &slot->bus->devices, bus_list) {
if (PCI_SLOT(dev->devfn) != PCI_SLOT(slot->devfn))
continue;
pci_dev_get(dev);
pci_stop_and_remove_bus_device(dev);
pci_dev_put(dev);
}
pci_dev_put(slot->dev);
slot->dev = NULL;
pci_unlock_rescan_remove();
dbg("%s - exit", __func__);
return 0;
}
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