![Rafael J. Wysocki](/assets/img/avatar_default.png)
Add kerneldoc comments to the reamining functions in drivers/pci/pcie/portdrv_core.c . Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
469 lines
13 KiB
C
469 lines
13 KiB
C
/*
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* File: portdrv_core.c
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* Purpose: PCI Express Port Bus Driver's Core Functions
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*
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* Copyright (C) 2004 Intel
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* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/pm.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/pcieport_if.h>
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#include "portdrv.h"
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extern int pcie_mch_quirk; /* MSI-quirk Indicator */
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/**
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* release_pcie_device - free PCI Express port service device structure
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* @dev: Port service device to release
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*
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* Invoked automatically when device is being removed in response to
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* device_unregister(dev). Release all resources being claimed.
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*/
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static void release_pcie_device(struct device *dev)
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{
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kfree(to_pcie_device(dev));
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}
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static int is_msi_quirked(struct pci_dev *dev)
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{
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int port_type, quirk = 0;
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u16 reg16;
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pci_read_config_word(dev,
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pci_find_capability(dev, PCI_CAP_ID_EXP) +
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PCIE_CAPABILITIES_REG, ®16);
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port_type = (reg16 >> 4) & PORT_TYPE_MASK;
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switch(port_type) {
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case PCIE_RC_PORT:
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if (pcie_mch_quirk == 1)
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quirk = 1;
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break;
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case PCIE_SW_UPSTREAM_PORT:
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case PCIE_SW_DOWNSTREAM_PORT:
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default:
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break;
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}
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return quirk;
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}
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/**
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* assign_interrupt_mode - choose interrupt mode for PCI Express port services
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* (INTx, MSI-X, MSI) and set up vectors
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* @dev: PCI Express port to handle
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* @vectors: Array of interrupt vectors to populate
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* @mask: Bitmask of port capabilities returned by get_port_device_capability()
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*
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* Return value: Interrupt mode associated with the port
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*/
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static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask)
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{
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int i, pos, nvec, status = -EINVAL;
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int interrupt_mode = PCIE_PORT_INTx_MODE;
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/* Set INTx as default */
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for (i = 0, nvec = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
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if (mask & (1 << i))
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nvec++;
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vectors[i] = dev->irq;
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}
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/* Check MSI quirk */
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if (is_msi_quirked(dev))
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return interrupt_mode;
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/* Select MSI-X over MSI if supported */
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pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
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if (pos) {
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struct msix_entry msix_entries[PCIE_PORT_DEVICE_MAXSERVICES] =
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{{0, 0}, {0, 1}, {0, 2}, {0, 3}};
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status = pci_enable_msix(dev, msix_entries, nvec);
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if (!status) {
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int j = 0;
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interrupt_mode = PCIE_PORT_MSIX_MODE;
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for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
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if (mask & (1 << i))
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vectors[i] = msix_entries[j++].vector;
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}
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}
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}
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if (status) {
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pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
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if (pos) {
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status = pci_enable_msi(dev);
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if (!status) {
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interrupt_mode = PCIE_PORT_MSI_MODE;
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for (i = 0;i < PCIE_PORT_DEVICE_MAXSERVICES;i++)
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vectors[i] = dev->irq;
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}
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}
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}
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return interrupt_mode;
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}
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/**
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* get_port_device_capability - discover capabilities of a PCI Express port
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* @dev: PCI Express port to examine
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*
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* The capabilities are read from the port's PCI Express configuration registers
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* as described in PCI Express Base Specification 1.0a sections 7.8.2, 7.8.9 and
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* 7.9 - 7.11.
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*
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* Return value: Bitmask of discovered port capabilities
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*/
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static int get_port_device_capability(struct pci_dev *dev)
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{
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int services = 0, pos;
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u16 reg16;
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u32 reg32;
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pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
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pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®16);
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/* Hot-Plug Capable */
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if (reg16 & PORT_TO_SLOT_MASK) {
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pci_read_config_dword(dev,
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pos + PCIE_SLOT_CAPABILITIES_REG, ®32);
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if (reg32 & SLOT_HP_CAPABLE_MASK)
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services |= PCIE_PORT_SERVICE_HP;
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}
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/* PME Capable - root port capability */
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if (((reg16 >> 4) & PORT_TYPE_MASK) == PCIE_RC_PORT)
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services |= PCIE_PORT_SERVICE_PME;
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if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR))
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services |= PCIE_PORT_SERVICE_AER;
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if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_VC))
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services |= PCIE_PORT_SERVICE_VC;
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return services;
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}
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/**
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* pcie_device_init - initialize PCI Express port service device
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* @dev: Port service device to initialize
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* @parent: PCI Express port to associate the service device with
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* @port_type: Type of the port
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* @service_type: Type of service to associate with the service device
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* @irq: Interrupt vector to associate with the service device
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* @irq_mode: Interrupt mode of the service (INTx, MSI-X, MSI)
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*/
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static void pcie_device_init(struct pci_dev *parent, struct pcie_device *dev,
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int port_type, int service_type, int irq, int irq_mode)
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{
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struct device *device;
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dev->port = parent;
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dev->interrupt_mode = irq_mode;
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dev->irq = irq;
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dev->id.vendor = parent->vendor;
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dev->id.device = parent->device;
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dev->id.port_type = port_type;
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dev->id.service_type = (1 << service_type);
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/* Initialize generic device interface */
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device = &dev->device;
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memset(device, 0, sizeof(struct device));
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device->bus = &pcie_port_bus_type;
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device->driver = NULL;
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device->driver_data = NULL;
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device->release = release_pcie_device; /* callback to free pcie dev */
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dev_set_name(device, "%s:pcie%02x",
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pci_name(parent), get_descriptor_id(port_type, service_type));
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device->parent = &parent->dev;
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}
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/**
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* alloc_pcie_device - allocate PCI Express port service device structure
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* @parent: PCI Express port to associate the service device with
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* @port_type: Type of the port
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* @service_type: Type of service to associate with the service device
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* @irq: Interrupt vector to associate with the service device
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* @irq_mode: Interrupt mode of the service (INTx, MSI-X, MSI)
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*/
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static struct pcie_device* alloc_pcie_device(struct pci_dev *parent,
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int port_type, int service_type, int irq, int irq_mode)
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{
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struct pcie_device *device;
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device = kzalloc(sizeof(struct pcie_device), GFP_KERNEL);
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if (!device)
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return NULL;
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pcie_device_init(parent, device, port_type, service_type, irq,irq_mode);
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return device;
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}
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/**
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* pcie_port_device_probe - check if device is a PCI Express port
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* @dev: Device to check
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*/
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int pcie_port_device_probe(struct pci_dev *dev)
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{
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int pos, type;
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u16 reg;
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if (!(pos = pci_find_capability(dev, PCI_CAP_ID_EXP)))
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return -ENODEV;
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pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, ®);
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type = (reg >> 4) & PORT_TYPE_MASK;
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if ( type == PCIE_RC_PORT || type == PCIE_SW_UPSTREAM_PORT ||
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type == PCIE_SW_DOWNSTREAM_PORT )
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return 0;
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return -ENODEV;
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}
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/**
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* pcie_port_device_register - register PCI Express port
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* @dev: PCI Express port to register
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*
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* Allocate the port extension structure and register services associated with
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* the port.
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*/
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int pcie_port_device_register(struct pci_dev *dev)
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{
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struct pcie_port_device_ext *p_ext;
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int status, type, capabilities, irq_mode, i;
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int vectors[PCIE_PORT_DEVICE_MAXSERVICES];
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u16 reg16;
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/* Allocate port device extension */
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if (!(p_ext = kmalloc(sizeof(struct pcie_port_device_ext), GFP_KERNEL)))
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return -ENOMEM;
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pci_set_drvdata(dev, p_ext);
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/* Get port type */
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pci_read_config_word(dev,
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pci_find_capability(dev, PCI_CAP_ID_EXP) +
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PCIE_CAPABILITIES_REG, ®16);
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type = (reg16 >> 4) & PORT_TYPE_MASK;
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/* Now get port services */
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capabilities = get_port_device_capability(dev);
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irq_mode = assign_interrupt_mode(dev, vectors, capabilities);
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p_ext->interrupt_mode = irq_mode;
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/* Allocate child services if any */
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for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
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struct pcie_device *child;
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if (capabilities & (1 << i)) {
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child = alloc_pcie_device(
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dev, /* parent */
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type, /* port type */
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i, /* service type */
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vectors[i], /* irq */
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irq_mode /* interrupt mode */);
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if (child) {
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status = device_register(&child->device);
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if (status) {
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kfree(child);
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continue;
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}
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get_device(&child->device);
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}
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}
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}
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return 0;
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}
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#ifdef CONFIG_PM
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static int suspend_iter(struct device *dev, void *data)
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{
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struct pcie_port_service_driver *service_driver;
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pm_message_t state = * (pm_message_t *) data;
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if ((dev->bus == &pcie_port_bus_type) &&
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(dev->driver)) {
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service_driver = to_service_driver(dev->driver);
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if (service_driver->suspend)
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service_driver->suspend(to_pcie_device(dev), state);
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}
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return 0;
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}
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/**
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* pcie_port_device_suspend - suspend port services associated with a PCIe port
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* @dev: PCI Express port to handle
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* @state: Representation of system power management transition in progress
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*/
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int pcie_port_device_suspend(struct pci_dev *dev, pm_message_t state)
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{
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return device_for_each_child(&dev->dev, &state, suspend_iter);
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}
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static int resume_iter(struct device *dev, void *data)
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{
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struct pcie_port_service_driver *service_driver;
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if ((dev->bus == &pcie_port_bus_type) &&
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(dev->driver)) {
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service_driver = to_service_driver(dev->driver);
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if (service_driver->resume)
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service_driver->resume(to_pcie_device(dev));
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}
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return 0;
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}
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/**
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* pcie_port_device_suspend - resume port services associated with a PCIe port
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* @dev: PCI Express port to handle
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*/
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int pcie_port_device_resume(struct pci_dev *dev)
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{
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return device_for_each_child(&dev->dev, NULL, resume_iter);
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}
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#endif
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static int remove_iter(struct device *dev, void *data)
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{
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struct pcie_port_service_driver *service_driver;
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if (dev->bus == &pcie_port_bus_type) {
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if (dev->driver) {
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service_driver = to_service_driver(dev->driver);
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if (service_driver->remove)
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service_driver->remove(to_pcie_device(dev));
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}
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*(unsigned long*)data = (unsigned long)dev;
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return 1;
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}
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return 0;
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}
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/**
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* pcie_port_device_remove - unregister PCI Express port service devices
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* @dev: PCI Express port the service devices to unregister are associated with
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*
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* Remove PCI Express port service devices associated with given port and
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* disable MSI-X or MSI for the port.
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*/
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void pcie_port_device_remove(struct pci_dev *dev)
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{
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struct device *device;
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unsigned long device_addr;
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int interrupt_mode = PCIE_PORT_INTx_MODE;
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int status;
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do {
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status = device_for_each_child(&dev->dev, &device_addr, remove_iter);
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if (status) {
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device = (struct device*)device_addr;
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interrupt_mode = (to_pcie_device(device))->interrupt_mode;
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put_device(device);
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device_unregister(device);
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}
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} while (status);
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/* Switch to INTx by default if MSI enabled */
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if (interrupt_mode == PCIE_PORT_MSIX_MODE)
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pci_disable_msix(dev);
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else if (interrupt_mode == PCIE_PORT_MSI_MODE)
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pci_disable_msi(dev);
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}
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/**
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* pcie_port_probe_service - probe driver for given PCI Express port service
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* @dev: PCI Express port service device to probe against
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*
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* If PCI Express port service driver is registered with
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* pcie_port_service_register(), this function will be called by the driver core
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* whenever match is found between the driver and a port service device.
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*/
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static int pcie_port_probe_service(struct device *dev)
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{
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struct pcie_device *pciedev;
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struct pcie_port_service_driver *driver;
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int status;
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if (!dev || !dev->driver)
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return -ENODEV;
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driver = to_service_driver(dev->driver);
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if (!driver || !driver->probe)
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return -ENODEV;
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pciedev = to_pcie_device(dev);
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status = driver->probe(pciedev, driver->id_table);
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if (!status) {
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dev_printk(KERN_DEBUG, dev, "service driver %s loaded\n",
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driver->name);
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get_device(dev);
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}
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return status;
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}
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/**
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* pcie_port_remove_service - detach driver from given PCI Express port service
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* @dev: PCI Express port service device to handle
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*
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* If PCI Express port service driver is registered with
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* pcie_port_service_register(), this function will be called by the driver core
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* when device_unregister() is called for the port service device associated
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* with the driver.
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*/
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static int pcie_port_remove_service(struct device *dev)
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{
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struct pcie_device *pciedev;
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struct pcie_port_service_driver *driver;
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if (!dev || !dev->driver)
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return 0;
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pciedev = to_pcie_device(dev);
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driver = to_service_driver(dev->driver);
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if (driver && driver->remove) {
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dev_printk(KERN_DEBUG, dev, "unloading service driver %s\n",
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driver->name);
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driver->remove(pciedev);
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put_device(dev);
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}
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return 0;
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}
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/**
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* pcie_port_shutdown_service - shut down given PCI Express port service
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* @dev: PCI Express port service device to handle
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*
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* If PCI Express port service driver is registered with
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* pcie_port_service_register(), this function will be called by the driver core
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* when device_shutdown() is called for the port service device associated
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* with the driver.
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*/
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static void pcie_port_shutdown_service(struct device *dev) {}
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/**
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* pcie_port_service_register - register PCI Express port service driver
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* @new: PCI Express port service driver to register
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*/
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int pcie_port_service_register(struct pcie_port_service_driver *new)
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{
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new->driver.name = (char *)new->name;
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new->driver.bus = &pcie_port_bus_type;
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new->driver.probe = pcie_port_probe_service;
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new->driver.remove = pcie_port_remove_service;
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new->driver.shutdown = pcie_port_shutdown_service;
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return driver_register(&new->driver);
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}
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/**
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* pcie_port_service_unregister - unregister PCI Express port service driver
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* @drv: PCI Express port service driver to unregister
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*/
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void pcie_port_service_unregister(struct pcie_port_service_driver *drv)
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{
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driver_unregister(&drv->driver);
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}
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EXPORT_SYMBOL(pcie_port_service_register);
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EXPORT_SYMBOL(pcie_port_service_unregister);
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