9965976a38
Remove unused port_data variable left over from the MCH hotplug quirk cleanup. Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
579 lines
16 KiB
C
579 lines
16 KiB
C
/*
|
|
* File: portdrv_core.c
|
|
* Purpose: PCI Express Port Bus Driver's Core Functions
|
|
*
|
|
* Copyright (C) 2004 Intel
|
|
* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/string.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/pcieport_if.h>
|
|
|
|
#include "../pci.h"
|
|
#include "portdrv.h"
|
|
|
|
/**
|
|
* release_pcie_device - free PCI Express port service device structure
|
|
* @dev: Port service device to release
|
|
*
|
|
* Invoked automatically when device is being removed in response to
|
|
* device_unregister(dev). Release all resources being claimed.
|
|
*/
|
|
static void release_pcie_device(struct device *dev)
|
|
{
|
|
kfree(to_pcie_device(dev));
|
|
}
|
|
|
|
/**
|
|
* pcie_port_msix_add_entry - add entry to given array of MSI-X entries
|
|
* @entries: Array of MSI-X entries
|
|
* @new_entry: Index of the entry to add to the array
|
|
* @nr_entries: Number of entries aleady in the array
|
|
*
|
|
* Return value: Position of the added entry in the array
|
|
*/
|
|
static int pcie_port_msix_add_entry(
|
|
struct msix_entry *entries, int new_entry, int nr_entries)
|
|
{
|
|
int j;
|
|
|
|
for (j = 0; j < nr_entries; j++)
|
|
if (entries[j].entry == new_entry)
|
|
return j;
|
|
|
|
entries[j].entry = new_entry;
|
|
return j;
|
|
}
|
|
|
|
/**
|
|
* pcie_port_enable_msix - try to set up MSI-X as interrupt mode for given port
|
|
* @dev: PCI Express port to handle
|
|
* @vectors: Array of interrupt vectors to populate
|
|
* @mask: Bitmask of port capabilities returned by get_port_device_capability()
|
|
*
|
|
* Return value: 0 on success, error code on failure
|
|
*/
|
|
static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask)
|
|
{
|
|
struct msix_entry *msix_entries;
|
|
int idx[PCIE_PORT_DEVICE_MAXSERVICES];
|
|
int nr_entries, status, pos, i, nvec;
|
|
u16 reg16;
|
|
u32 reg32;
|
|
|
|
nr_entries = pci_msix_table_size(dev);
|
|
if (!nr_entries)
|
|
return -EINVAL;
|
|
if (nr_entries > PCIE_PORT_MAX_MSIX_ENTRIES)
|
|
nr_entries = PCIE_PORT_MAX_MSIX_ENTRIES;
|
|
|
|
msix_entries = kzalloc(sizeof(*msix_entries) * nr_entries, GFP_KERNEL);
|
|
if (!msix_entries)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Allocate as many entries as the port wants, so that we can check
|
|
* which of them will be useful. Moreover, if nr_entries is correctly
|
|
* equal to the number of entries this port actually uses, we'll happily
|
|
* go through without any tricks.
|
|
*/
|
|
for (i = 0; i < nr_entries; i++)
|
|
msix_entries[i].entry = i;
|
|
|
|
status = pci_enable_msix(dev, msix_entries, nr_entries);
|
|
if (status)
|
|
goto Exit;
|
|
|
|
for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
|
|
idx[i] = -1;
|
|
status = -EIO;
|
|
nvec = 0;
|
|
|
|
if (mask & (PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP)) {
|
|
int entry;
|
|
|
|
/*
|
|
* The code below follows the PCI Express Base Specification 2.0
|
|
* stating in Section 6.1.6 that "PME and Hot-Plug Event
|
|
* interrupts (when both are implemented) always share the same
|
|
* MSI or MSI-X vector, as indicated by the Interrupt Message
|
|
* Number field in the PCI Express Capabilities register", where
|
|
* according to Section 7.8.2 of the specification "For MSI-X,
|
|
* the value in this field indicates which MSI-X Table entry is
|
|
* used to generate the interrupt message."
|
|
*/
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
|
|
pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®16);
|
|
entry = (reg16 >> 9) & PCIE_PORT_MSI_VECTOR_MASK;
|
|
if (entry >= nr_entries)
|
|
goto Error;
|
|
|
|
i = pcie_port_msix_add_entry(msix_entries, entry, nvec);
|
|
if (i == nvec)
|
|
nvec++;
|
|
|
|
idx[PCIE_PORT_SERVICE_PME_SHIFT] = i;
|
|
idx[PCIE_PORT_SERVICE_HP_SHIFT] = i;
|
|
}
|
|
|
|
if (mask & PCIE_PORT_SERVICE_AER) {
|
|
int entry;
|
|
|
|
/*
|
|
* The code below follows Section 7.10.10 of the PCI Express
|
|
* Base Specification 2.0 stating that bits 31-27 of the Root
|
|
* Error Status Register contain a value indicating which of the
|
|
* MSI/MSI-X vectors assigned to the port is going to be used
|
|
* for AER, where "For MSI-X, the value in this register
|
|
* indicates which MSI-X Table entry is used to generate the
|
|
* interrupt message."
|
|
*/
|
|
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
|
|
pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, ®32);
|
|
entry = reg32 >> 27;
|
|
if (entry >= nr_entries)
|
|
goto Error;
|
|
|
|
i = pcie_port_msix_add_entry(msix_entries, entry, nvec);
|
|
if (i == nvec)
|
|
nvec++;
|
|
|
|
idx[PCIE_PORT_SERVICE_AER_SHIFT] = i;
|
|
}
|
|
|
|
/*
|
|
* If nvec is equal to the allocated number of entries, we can just use
|
|
* what we have. Otherwise, the port has some extra entries not for the
|
|
* services we know and we need to work around that.
|
|
*/
|
|
if (nvec == nr_entries) {
|
|
status = 0;
|
|
} else {
|
|
/* Drop the temporary MSI-X setup */
|
|
pci_disable_msix(dev);
|
|
|
|
/* Now allocate the MSI-X vectors for real */
|
|
status = pci_enable_msix(dev, msix_entries, nvec);
|
|
if (status)
|
|
goto Exit;
|
|
}
|
|
|
|
for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
|
|
vectors[i] = idx[i] >= 0 ? msix_entries[idx[i]].vector : -1;
|
|
|
|
Exit:
|
|
kfree(msix_entries);
|
|
return status;
|
|
|
|
Error:
|
|
pci_disable_msix(dev);
|
|
goto Exit;
|
|
}
|
|
|
|
/**
|
|
* assign_interrupt_mode - choose interrupt mode for PCI Express port services
|
|
* (INTx, MSI-X, MSI) and set up vectors
|
|
* @dev: PCI Express port to handle
|
|
* @vectors: Array of interrupt vectors to populate
|
|
* @mask: Bitmask of port capabilities returned by get_port_device_capability()
|
|
*
|
|
* Return value: Interrupt mode associated with the port
|
|
*/
|
|
static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask)
|
|
{
|
|
int irq, interrupt_mode = PCIE_PORT_NO_IRQ;
|
|
int i;
|
|
|
|
/* Try to use MSI-X if supported */
|
|
if (!pcie_port_enable_msix(dev, vectors, mask))
|
|
return PCIE_PORT_MSIX_MODE;
|
|
|
|
/* We're not going to use MSI-X, so try MSI and fall back to INTx */
|
|
if (!pci_enable_msi(dev))
|
|
interrupt_mode = PCIE_PORT_MSI_MODE;
|
|
|
|
if (interrupt_mode == PCIE_PORT_NO_IRQ && dev->pin)
|
|
interrupt_mode = PCIE_PORT_INTx_MODE;
|
|
|
|
irq = interrupt_mode != PCIE_PORT_NO_IRQ ? dev->irq : -1;
|
|
for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
|
|
vectors[i] = irq;
|
|
|
|
vectors[PCIE_PORT_SERVICE_VC_SHIFT] = -1;
|
|
|
|
return interrupt_mode;
|
|
}
|
|
|
|
/**
|
|
* get_port_device_capability - discover capabilities of a PCI Express port
|
|
* @dev: PCI Express port to examine
|
|
*
|
|
* The capabilities are read from the port's PCI Express configuration registers
|
|
* as described in PCI Express Base Specification 1.0a sections 7.8.2, 7.8.9 and
|
|
* 7.9 - 7.11.
|
|
*
|
|
* Return value: Bitmask of discovered port capabilities
|
|
*/
|
|
static int get_port_device_capability(struct pci_dev *dev)
|
|
{
|
|
int services = 0, pos;
|
|
u16 reg16;
|
|
u32 reg32;
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
|
|
pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®16);
|
|
/* Hot-Plug Capable */
|
|
if (reg16 & PORT_TO_SLOT_MASK) {
|
|
pci_read_config_dword(dev,
|
|
pos + PCIE_SLOT_CAPABILITIES_REG, ®32);
|
|
if (reg32 & SLOT_HP_CAPABLE_MASK)
|
|
services |= PCIE_PORT_SERVICE_HP;
|
|
}
|
|
/* AER capable */
|
|
if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR))
|
|
services |= PCIE_PORT_SERVICE_AER;
|
|
/* VC support */
|
|
if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_VC))
|
|
services |= PCIE_PORT_SERVICE_VC;
|
|
|
|
return services;
|
|
}
|
|
|
|
/**
|
|
* pcie_device_init - initialize PCI Express port service device
|
|
* @dev: Port service device to initialize
|
|
* @parent: PCI Express port to associate the service device with
|
|
* @port_type: Type of the port
|
|
* @service_type: Type of service to associate with the service device
|
|
* @irq: Interrupt vector to associate with the service device
|
|
*/
|
|
static void pcie_device_init(struct pci_dev *parent, struct pcie_device *dev,
|
|
int service_type, int irq)
|
|
{
|
|
struct pcie_port_data *port_data = pci_get_drvdata(parent);
|
|
struct device *device;
|
|
int port_type = port_data->port_type;
|
|
|
|
dev->port = parent;
|
|
dev->irq = irq;
|
|
dev->service = service_type;
|
|
|
|
/* Initialize generic device interface */
|
|
device = &dev->device;
|
|
memset(device, 0, sizeof(struct device));
|
|
device->bus = &pcie_port_bus_type;
|
|
device->driver = NULL;
|
|
dev_set_drvdata(device, NULL);
|
|
device->release = release_pcie_device; /* callback to free pcie dev */
|
|
dev_set_name(device, "%s:pcie%02x",
|
|
pci_name(parent), get_descriptor_id(port_type, service_type));
|
|
device->parent = &parent->dev;
|
|
}
|
|
|
|
/**
|
|
* alloc_pcie_device - allocate PCI Express port service device structure
|
|
* @parent: PCI Express port to associate the service device with
|
|
* @port_type: Type of the port
|
|
* @service_type: Type of service to associate with the service device
|
|
* @irq: Interrupt vector to associate with the service device
|
|
*/
|
|
static struct pcie_device* alloc_pcie_device(struct pci_dev *parent,
|
|
int service_type, int irq)
|
|
{
|
|
struct pcie_device *device;
|
|
|
|
device = kzalloc(sizeof(struct pcie_device), GFP_KERNEL);
|
|
if (!device)
|
|
return NULL;
|
|
|
|
pcie_device_init(parent, device, service_type, irq);
|
|
return device;
|
|
}
|
|
|
|
/**
|
|
* pcie_port_device_probe - check if device is a PCI Express port
|
|
* @dev: Device to check
|
|
*/
|
|
int pcie_port_device_probe(struct pci_dev *dev)
|
|
{
|
|
int pos, type;
|
|
u16 reg;
|
|
|
|
if (!(pos = pci_find_capability(dev, PCI_CAP_ID_EXP)))
|
|
return -ENODEV;
|
|
|
|
pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®);
|
|
type = (reg >> 4) & PORT_TYPE_MASK;
|
|
if ( type == PCIE_RC_PORT || type == PCIE_SW_UPSTREAM_PORT ||
|
|
type == PCIE_SW_DOWNSTREAM_PORT )
|
|
return 0;
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
/**
|
|
* pcie_port_device_register - register PCI Express port
|
|
* @dev: PCI Express port to register
|
|
*
|
|
* Allocate the port extension structure and register services associated with
|
|
* the port.
|
|
*/
|
|
int pcie_port_device_register(struct pci_dev *dev)
|
|
{
|
|
struct pcie_port_data *port_data;
|
|
int status, capabilities, irq_mode, i, nr_serv;
|
|
int vectors[PCIE_PORT_DEVICE_MAXSERVICES];
|
|
u16 reg16;
|
|
|
|
port_data = kzalloc(sizeof(*port_data), GFP_KERNEL);
|
|
if (!port_data)
|
|
return -ENOMEM;
|
|
pci_set_drvdata(dev, port_data);
|
|
|
|
/* Get port type */
|
|
pci_read_config_word(dev,
|
|
pci_find_capability(dev, PCI_CAP_ID_EXP) +
|
|
PCIE_CAPABILITIES_REG, ®16);
|
|
port_data->port_type = (reg16 >> 4) & PORT_TYPE_MASK;
|
|
|
|
capabilities = get_port_device_capability(dev);
|
|
/* Root ports are capable of generating PME too */
|
|
if (port_data->port_type == PCIE_RC_PORT)
|
|
capabilities |= PCIE_PORT_SERVICE_PME;
|
|
|
|
irq_mode = assign_interrupt_mode(dev, vectors, capabilities);
|
|
if (irq_mode == PCIE_PORT_NO_IRQ) {
|
|
/*
|
|
* Don't use service devices that require interrupts if there is
|
|
* no way to generate them.
|
|
*/
|
|
if (!(capabilities & PCIE_PORT_SERVICE_VC)) {
|
|
status = -ENODEV;
|
|
goto Error;
|
|
}
|
|
capabilities = PCIE_PORT_SERVICE_VC;
|
|
}
|
|
port_data->port_irq_mode = irq_mode;
|
|
|
|
status = pci_enable_device(dev);
|
|
if (status)
|
|
goto Error;
|
|
pci_set_master(dev);
|
|
|
|
/* Allocate child services if any */
|
|
for (i = 0, nr_serv = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
|
|
struct pcie_device *child;
|
|
int service = 1 << i;
|
|
|
|
if (!(capabilities & service))
|
|
continue;
|
|
|
|
child = alloc_pcie_device(dev, service, vectors[i]);
|
|
if (!child)
|
|
continue;
|
|
|
|
status = device_register(&child->device);
|
|
if (status) {
|
|
kfree(child);
|
|
continue;
|
|
}
|
|
|
|
get_device(&child->device);
|
|
nr_serv++;
|
|
}
|
|
if (!nr_serv) {
|
|
pci_disable_device(dev);
|
|
status = -ENODEV;
|
|
goto Error;
|
|
}
|
|
|
|
return 0;
|
|
|
|
Error:
|
|
kfree(port_data);
|
|
return status;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int suspend_iter(struct device *dev, void *data)
|
|
{
|
|
struct pcie_port_service_driver *service_driver;
|
|
|
|
if ((dev->bus == &pcie_port_bus_type) &&
|
|
(dev->driver)) {
|
|
service_driver = to_service_driver(dev->driver);
|
|
if (service_driver->suspend)
|
|
service_driver->suspend(to_pcie_device(dev));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pcie_port_device_suspend - suspend port services associated with a PCIe port
|
|
* @dev: PCI Express port to handle
|
|
*/
|
|
int pcie_port_device_suspend(struct device *dev)
|
|
{
|
|
return device_for_each_child(dev, NULL, suspend_iter);
|
|
}
|
|
|
|
static int resume_iter(struct device *dev, void *data)
|
|
{
|
|
struct pcie_port_service_driver *service_driver;
|
|
|
|
if ((dev->bus == &pcie_port_bus_type) &&
|
|
(dev->driver)) {
|
|
service_driver = to_service_driver(dev->driver);
|
|
if (service_driver->resume)
|
|
service_driver->resume(to_pcie_device(dev));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pcie_port_device_suspend - resume port services associated with a PCIe port
|
|
* @dev: PCI Express port to handle
|
|
*/
|
|
int pcie_port_device_resume(struct device *dev)
|
|
{
|
|
return device_for_each_child(dev, NULL, resume_iter);
|
|
}
|
|
#endif /* PM */
|
|
|
|
static int remove_iter(struct device *dev, void *data)
|
|
{
|
|
if (dev->bus == &pcie_port_bus_type) {
|
|
put_device(dev);
|
|
device_unregister(dev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pcie_port_device_remove - unregister PCI Express port service devices
|
|
* @dev: PCI Express port the service devices to unregister are associated with
|
|
*
|
|
* Remove PCI Express port service devices associated with given port and
|
|
* disable MSI-X or MSI for the port.
|
|
*/
|
|
void pcie_port_device_remove(struct pci_dev *dev)
|
|
{
|
|
struct pcie_port_data *port_data = pci_get_drvdata(dev);
|
|
|
|
device_for_each_child(&dev->dev, NULL, remove_iter);
|
|
pci_disable_device(dev);
|
|
|
|
switch (port_data->port_irq_mode) {
|
|
case PCIE_PORT_MSIX_MODE:
|
|
pci_disable_msix(dev);
|
|
break;
|
|
case PCIE_PORT_MSI_MODE:
|
|
pci_disable_msi(dev);
|
|
break;
|
|
}
|
|
|
|
kfree(port_data);
|
|
}
|
|
|
|
/**
|
|
* pcie_port_probe_service - probe driver for given PCI Express port service
|
|
* @dev: PCI Express port service device to probe against
|
|
*
|
|
* If PCI Express port service driver is registered with
|
|
* pcie_port_service_register(), this function will be called by the driver core
|
|
* whenever match is found between the driver and a port service device.
|
|
*/
|
|
static int pcie_port_probe_service(struct device *dev)
|
|
{
|
|
struct pcie_device *pciedev;
|
|
struct pcie_port_service_driver *driver;
|
|
int status;
|
|
|
|
if (!dev || !dev->driver)
|
|
return -ENODEV;
|
|
|
|
driver = to_service_driver(dev->driver);
|
|
if (!driver || !driver->probe)
|
|
return -ENODEV;
|
|
|
|
pciedev = to_pcie_device(dev);
|
|
status = driver->probe(pciedev);
|
|
if (!status) {
|
|
dev_printk(KERN_DEBUG, dev, "service driver %s loaded\n",
|
|
driver->name);
|
|
get_device(dev);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* pcie_port_remove_service - detach driver from given PCI Express port service
|
|
* @dev: PCI Express port service device to handle
|
|
*
|
|
* If PCI Express port service driver is registered with
|
|
* pcie_port_service_register(), this function will be called by the driver core
|
|
* when device_unregister() is called for the port service device associated
|
|
* with the driver.
|
|
*/
|
|
static int pcie_port_remove_service(struct device *dev)
|
|
{
|
|
struct pcie_device *pciedev;
|
|
struct pcie_port_service_driver *driver;
|
|
|
|
if (!dev || !dev->driver)
|
|
return 0;
|
|
|
|
pciedev = to_pcie_device(dev);
|
|
driver = to_service_driver(dev->driver);
|
|
if (driver && driver->remove) {
|
|
dev_printk(KERN_DEBUG, dev, "unloading service driver %s\n",
|
|
driver->name);
|
|
driver->remove(pciedev);
|
|
put_device(dev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pcie_port_shutdown_service - shut down given PCI Express port service
|
|
* @dev: PCI Express port service device to handle
|
|
*
|
|
* If PCI Express port service driver is registered with
|
|
* pcie_port_service_register(), this function will be called by the driver core
|
|
* when device_shutdown() is called for the port service device associated
|
|
* with the driver.
|
|
*/
|
|
static void pcie_port_shutdown_service(struct device *dev) {}
|
|
|
|
/**
|
|
* pcie_port_service_register - register PCI Express port service driver
|
|
* @new: PCI Express port service driver to register
|
|
*/
|
|
int pcie_port_service_register(struct pcie_port_service_driver *new)
|
|
{
|
|
new->driver.name = (char *)new->name;
|
|
new->driver.bus = &pcie_port_bus_type;
|
|
new->driver.probe = pcie_port_probe_service;
|
|
new->driver.remove = pcie_port_remove_service;
|
|
new->driver.shutdown = pcie_port_shutdown_service;
|
|
|
|
return driver_register(&new->driver);
|
|
}
|
|
|
|
/**
|
|
* pcie_port_service_unregister - unregister PCI Express port service driver
|
|
* @drv: PCI Express port service driver to unregister
|
|
*/
|
|
void pcie_port_service_unregister(struct pcie_port_service_driver *drv)
|
|
{
|
|
driver_unregister(&drv->driver);
|
|
}
|
|
|
|
EXPORT_SYMBOL(pcie_port_service_register);
|
|
EXPORT_SYMBOL(pcie_port_service_unregister);
|