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275 lines
5.8 KiB
275 lines
5.8 KiB
// 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 <[email protected]> |
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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_SPINLOCK(zbus_list_lock); |
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static int zpci_nb_devices; |
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/* zpci_bus_scan |
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* @zbus: the zbus holding the zdevices |
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* @ops: the pci operations |
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* |
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* The domain number must be set before pci_scan_root_bus is called. |
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* This function can be called once the domain is known, hence |
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* when the function_0 is dicovered. |
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*/ |
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static int zpci_bus_scan(struct zpci_bus *zbus, int domain, struct pci_ops *ops) |
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{ |
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struct pci_bus *bus; |
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int rc; |
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rc = zpci_alloc_domain(domain); |
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if (rc < 0) |
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return rc; |
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zbus->domain_nr = rc; |
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bus = pci_scan_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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spin_lock(&zbus_list_lock); |
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list_del(&zbus->bus_next); |
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spin_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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spin_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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spin_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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spin_lock(&zbus_list_lock); |
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list_add_tail(&zbus->bus_next, &zbus_list); |
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spin_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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struct pci_bus *bus; |
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struct resource_entry *window, *n; |
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struct resource *res; |
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struct pci_dev *pdev; |
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int rc; |
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bus = zbus->bus; |
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if (!bus) |
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return -EINVAL; |
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pdev = pci_get_slot(bus, zdev->devfn); |
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if (pdev) { |
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/* Device is already known. */ |
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pci_dev_put(pdev); |
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return 0; |
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} |
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rc = zpci_init_slot(zdev); |
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if (rc) |
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return rc; |
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zdev->has_hp_slot = 1; |
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resource_list_for_each_entry_safe(window, n, &zbus->resources) { |
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res = window->res; |
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pci_bus_add_resource(bus, res, 0); |
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} |
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pdev = pci_scan_single_device(bus, zdev->devfn); |
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if (pdev) |
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pci_bus_add_device(pdev); |
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return 0; |
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} |
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static void zpci_bus_add_devices(struct zpci_bus *zbus) |
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{ |
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int i; |
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for (i = 1; i < ZPCI_FUNCTIONS_PER_BUS; i++) |
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if (zbus->function[i]) |
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zpci_bus_add_device(zbus, zbus->function[i]); |
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pci_lock_rescan_remove(); |
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pci_bus_add_devices(zbus->bus); |
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pci_unlock_rescan_remove(); |
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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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zpci_nb_devices++; |
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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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zdev->zbus = zbus; |
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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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goto error; /* rc already set */ |
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} |
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zbus->function[zdev->devfn] = zdev; |
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zpci_setup_bus_resources(zdev, &zbus->resources); |
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if (zbus->bus) { |
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if (!zbus->multifunction) { |
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WARN_ONCE(1, "zbus is not multifunction\n"); |
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goto error_bus; |
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} |
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if (!zdev->rid_available) { |
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WARN_ONCE(1, "rid_available not set for multifunction\n"); |
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goto error_bus; |
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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_bus; |
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} else if (zdev->devfn == 0) { |
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if (zbus->multifunction && !zdev->rid_available) { |
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WARN_ONCE(1, "rid_available not set on function 0 for multifunction\n"); |
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goto error_bus; |
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} |
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rc = zpci_bus_scan(zbus, (u16)zdev->uid, ops); |
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if (rc) |
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goto error_bus; |
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zpci_bus_add_devices(zbus); |
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rc = zpci_init_slot(zdev); |
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if (rc) |
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goto error_bus; |
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zdev->has_hp_slot = 1; |
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zbus->multifunction = zdev->rid_available; |
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zbus->max_bus_speed = zdev->max_bus_speed; |
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} else { |
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zbus->multifunction = 1; |
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} |
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return 0; |
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error_bus: |
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zpci_nb_devices--; |
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zbus->function[zdev->devfn] = NULL; |
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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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