385 lines
8.8 KiB
C
385 lines
8.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2020
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*
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* Author(s):
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* Pierre Morel <pmorel@linux.ibm.com>
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*
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*/
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#define KMSG_COMPONENT "zpci"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/delay.h>
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#include <linux/seq_file.h>
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#include <linux/jump_label.h>
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#include <linux/pci.h>
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#include <linux/printk.h>
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#include <asm/pci_clp.h>
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#include <asm/pci_dma.h>
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#include "pci_bus.h"
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#include "pci_iov.h"
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static LIST_HEAD(zbus_list);
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static DEFINE_MUTEX(zbus_list_lock);
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static int zpci_nb_devices;
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/* zpci_bus_prepare_device - Prepare a zPCI function for scanning
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* @zdev: the zPCI function to be prepared
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*
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* The PCI resources for the function are set up and added to its zbus and the
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* function is enabled. The function must be added to a zbus which must have
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* a PCI bus created. If an error occurs the zPCI function is not enabled.
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*
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* Return: 0 on success, an error code otherwise
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*/
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static int zpci_bus_prepare_device(struct zpci_dev *zdev)
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{
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int rc, i;
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if (!zdev_enabled(zdev)) {
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rc = zpci_enable_device(zdev);
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if (rc)
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return rc;
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rc = zpci_dma_init_device(zdev);
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if (rc) {
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zpci_disable_device(zdev);
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return rc;
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}
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}
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if (!zdev->has_resources) {
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zpci_setup_bus_resources(zdev);
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for (i = 0; i < PCI_STD_NUM_BARS; i++) {
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if (zdev->bars[i].res)
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pci_bus_add_resource(zdev->zbus->bus, zdev->bars[i].res, 0);
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}
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}
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return 0;
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}
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/* zpci_bus_scan_device - Scan a single device adding it to the PCI core
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* @zdev: the zdev to be scanned
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*
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* Scans the PCI function making it available to the common PCI code.
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*
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* Return: 0 on success, an error value otherwise
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*/
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int zpci_bus_scan_device(struct zpci_dev *zdev)
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{
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struct pci_dev *pdev;
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int rc;
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rc = zpci_bus_prepare_device(zdev);
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if (rc)
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return rc;
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pdev = pci_scan_single_device(zdev->zbus->bus, zdev->devfn);
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if (!pdev)
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return -ENODEV;
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pci_bus_add_device(pdev);
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pci_lock_rescan_remove();
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pci_bus_add_devices(zdev->zbus->bus);
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pci_unlock_rescan_remove();
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return 0;
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}
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/* zpci_bus_remove_device - Removes the given zdev from the PCI core
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* @zdev: the zdev to be removed from the PCI core
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* @set_error: if true the device's error state is set to permanent failure
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*
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* Sets a zPCI device to a configured but offline state; the zPCI
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* device is still accessible through its hotplug slot and the zPCI
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* API but is removed from the common code PCI bus, making it
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* no longer available to drivers.
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*/
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void zpci_bus_remove_device(struct zpci_dev *zdev, bool set_error)
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{
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struct zpci_bus *zbus = zdev->zbus;
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struct pci_dev *pdev;
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if (!zdev->zbus->bus)
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return;
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pdev = pci_get_slot(zbus->bus, zdev->devfn);
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if (pdev) {
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if (set_error)
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pdev->error_state = pci_channel_io_perm_failure;
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if (pdev->is_virtfn) {
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zpci_iov_remove_virtfn(pdev, zdev->vfn);
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/* balance pci_get_slot */
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pci_dev_put(pdev);
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return;
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}
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pci_stop_and_remove_bus_device_locked(pdev);
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/* balance pci_get_slot */
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pci_dev_put(pdev);
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}
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}
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/* zpci_bus_scan_bus - Scan all configured zPCI functions on the bus
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* @zbus: the zbus to be scanned
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*
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* Enables and scans all PCI functions on the bus making them available to the
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* common PCI code. If there is no function 0 on the zbus nothing is scanned. If
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* a function does not have a slot yet because it was added to the zbus before
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* function 0 the slot is created. If a PCI function fails to be initialized
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* an error will be returned but attempts will still be made for all other
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* functions on the bus.
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*
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* Return: 0 on success, an error value otherwise
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*/
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int zpci_bus_scan_bus(struct zpci_bus *zbus)
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{
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struct zpci_dev *zdev;
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int devfn, rc, ret = 0;
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for (devfn = 0; devfn < ZPCI_FUNCTIONS_PER_BUS; devfn++) {
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zdev = zbus->function[devfn];
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if (zdev && zdev->state == ZPCI_FN_STATE_CONFIGURED) {
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rc = zpci_bus_prepare_device(zdev);
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if (rc)
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ret = -EIO;
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}
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}
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pci_lock_rescan_remove();
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pci_scan_child_bus(zbus->bus);
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pci_bus_add_devices(zbus->bus);
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pci_unlock_rescan_remove();
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return ret;
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}
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/* zpci_bus_scan_busses - Scan all registered busses
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*
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* Scan all available zbusses
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*
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*/
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void zpci_bus_scan_busses(void)
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{
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struct zpci_bus *zbus = NULL;
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mutex_lock(&zbus_list_lock);
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list_for_each_entry(zbus, &zbus_list, bus_next) {
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zpci_bus_scan_bus(zbus);
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cond_resched();
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}
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mutex_unlock(&zbus_list_lock);
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}
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/* zpci_bus_create_pci_bus - Create the PCI bus associated with this zbus
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* @zbus: the zbus holding the zdevices
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* @fr: PCI root function that will determine the bus's domain, and bus speeed
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* @ops: the pci operations
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*
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* The PCI function @fr determines the domain (its UID), multifunction property
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* and maximum bus speed of the entire bus.
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*
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* Return: 0 on success, an error code otherwise
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*/
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static int zpci_bus_create_pci_bus(struct zpci_bus *zbus, struct zpci_dev *fr, struct pci_ops *ops)
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{
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struct pci_bus *bus;
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int domain;
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domain = zpci_alloc_domain((u16)fr->uid);
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if (domain < 0)
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return domain;
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zbus->domain_nr = domain;
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zbus->multifunction = fr->rid_available;
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zbus->max_bus_speed = fr->max_bus_speed;
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/*
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* Note that the zbus->resources are taken over and zbus->resources
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* is empty after a successful call
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*/
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bus = pci_create_root_bus(NULL, ZPCI_BUS_NR, ops, zbus, &zbus->resources);
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if (!bus) {
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zpci_free_domain(zbus->domain_nr);
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return -EFAULT;
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}
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zbus->bus = bus;
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pci_bus_add_devices(bus);
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return 0;
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}
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static void zpci_bus_release(struct kref *kref)
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{
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struct zpci_bus *zbus = container_of(kref, struct zpci_bus, kref);
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if (zbus->bus) {
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pci_lock_rescan_remove();
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pci_stop_root_bus(zbus->bus);
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zpci_free_domain(zbus->domain_nr);
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pci_free_resource_list(&zbus->resources);
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pci_remove_root_bus(zbus->bus);
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pci_unlock_rescan_remove();
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}
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mutex_lock(&zbus_list_lock);
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list_del(&zbus->bus_next);
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mutex_unlock(&zbus_list_lock);
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kfree(zbus);
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}
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static void zpci_bus_put(struct zpci_bus *zbus)
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{
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kref_put(&zbus->kref, zpci_bus_release);
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}
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static struct zpci_bus *zpci_bus_get(int pchid)
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{
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struct zpci_bus *zbus;
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mutex_lock(&zbus_list_lock);
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list_for_each_entry(zbus, &zbus_list, bus_next) {
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if (pchid == zbus->pchid) {
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kref_get(&zbus->kref);
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goto out_unlock;
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}
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}
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zbus = NULL;
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out_unlock:
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mutex_unlock(&zbus_list_lock);
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return zbus;
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}
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static struct zpci_bus *zpci_bus_alloc(int pchid)
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{
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struct zpci_bus *zbus;
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zbus = kzalloc(sizeof(*zbus), GFP_KERNEL);
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if (!zbus)
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return NULL;
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zbus->pchid = pchid;
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INIT_LIST_HEAD(&zbus->bus_next);
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mutex_lock(&zbus_list_lock);
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list_add_tail(&zbus->bus_next, &zbus_list);
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mutex_unlock(&zbus_list_lock);
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kref_init(&zbus->kref);
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INIT_LIST_HEAD(&zbus->resources);
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zbus->bus_resource.start = 0;
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zbus->bus_resource.end = ZPCI_BUS_NR;
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zbus->bus_resource.flags = IORESOURCE_BUS;
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pci_add_resource(&zbus->resources, &zbus->bus_resource);
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return zbus;
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}
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void pcibios_bus_add_device(struct pci_dev *pdev)
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{
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struct zpci_dev *zdev = to_zpci(pdev);
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/*
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* With pdev->no_vf_scan the common PCI probing code does not
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* perform PF/VF linking.
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*/
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if (zdev->vfn) {
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zpci_iov_setup_virtfn(zdev->zbus, pdev, zdev->vfn);
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pdev->no_command_memory = 1;
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}
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}
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static int zpci_bus_add_device(struct zpci_bus *zbus, struct zpci_dev *zdev)
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{
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int rc = -EINVAL;
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if (zbus->function[zdev->devfn]) {
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pr_err("devfn %04x is already assigned\n", zdev->devfn);
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return rc;
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}
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zdev->zbus = zbus;
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zbus->function[zdev->devfn] = zdev;
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zpci_nb_devices++;
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if (zbus->multifunction && !zdev->rid_available) {
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WARN_ONCE(1, "rid_available not set for multifunction\n");
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goto error;
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}
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rc = zpci_init_slot(zdev);
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if (rc)
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goto error;
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zdev->has_hp_slot = 1;
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return 0;
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error:
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zbus->function[zdev->devfn] = NULL;
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zdev->zbus = NULL;
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zpci_nb_devices--;
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return rc;
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}
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int zpci_bus_device_register(struct zpci_dev *zdev, struct pci_ops *ops)
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{
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struct zpci_bus *zbus = NULL;
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int rc = -EBADF;
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if (zpci_nb_devices == ZPCI_NR_DEVICES) {
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pr_warn("Adding PCI function %08x failed because the configured limit of %d is reached\n",
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zdev->fid, ZPCI_NR_DEVICES);
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return -ENOSPC;
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}
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if (zdev->devfn >= ZPCI_FUNCTIONS_PER_BUS)
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return -EINVAL;
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if (!s390_pci_no_rid && zdev->rid_available)
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zbus = zpci_bus_get(zdev->pchid);
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if (!zbus) {
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zbus = zpci_bus_alloc(zdev->pchid);
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if (!zbus)
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return -ENOMEM;
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}
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if (!zbus->bus) {
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/* The UID of the first PCI function registered with a zpci_bus
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* is used as the domain number for that bus. Currently there
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* is exactly one zpci_bus per domain.
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*/
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rc = zpci_bus_create_pci_bus(zbus, zdev, ops);
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if (rc)
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goto error;
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}
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rc = zpci_bus_add_device(zbus, zdev);
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if (rc)
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goto error;
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return 0;
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error:
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pr_err("Adding PCI function %08x failed\n", zdev->fid);
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zpci_bus_put(zbus);
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return rc;
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}
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void zpci_bus_device_unregister(struct zpci_dev *zdev)
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{
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struct zpci_bus *zbus = zdev->zbus;
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zpci_nb_devices--;
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zbus->function[zdev->devfn] = NULL;
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zpci_bus_put(zbus);
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}
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