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-rw-r--r--arch/s390/pci/pci.c983
1 files changed, 983 insertions, 0 deletions
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
new file mode 100644
index 000000000..74799439b
--- /dev/null
+++ b/arch/s390/pci/pci.c
@@ -0,0 +1,983 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright IBM Corp. 2012
+ *
+ * Author(s):
+ * Jan Glauber <jang@linux.vnet.ibm.com>
+ *
+ * The System z PCI code is a rewrite from a prototype by
+ * the following people (Kudoz!):
+ * Alexander Schmidt
+ * Christoph Raisch
+ * Hannes Hering
+ * Hoang-Nam Nguyen
+ * Jan-Bernd Themann
+ * Stefan Roscher
+ * Thomas Klein
+ */
+
+#define KMSG_COMPONENT "zpci"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/delay.h>
+#include <linux/seq_file.h>
+#include <linux/jump_label.h>
+#include <linux/pci.h>
+#include <linux/printk.h>
+
+#include <asm/isc.h>
+#include <asm/airq.h>
+#include <asm/facility.h>
+#include <asm/pci_insn.h>
+#include <asm/pci_clp.h>
+#include <asm/pci_dma.h>
+
+#include "pci_bus.h"
+#include "pci_iov.h"
+
+/* list of all detected zpci devices */
+static LIST_HEAD(zpci_list);
+static DEFINE_SPINLOCK(zpci_list_lock);
+
+static DECLARE_BITMAP(zpci_domain, ZPCI_DOMAIN_BITMAP_SIZE);
+static DEFINE_SPINLOCK(zpci_domain_lock);
+
+#define ZPCI_IOMAP_ENTRIES \
+ min(((unsigned long) ZPCI_NR_DEVICES * PCI_STD_NUM_BARS / 2), \
+ ZPCI_IOMAP_MAX_ENTRIES)
+
+unsigned int s390_pci_no_rid;
+
+static DEFINE_SPINLOCK(zpci_iomap_lock);
+static unsigned long *zpci_iomap_bitmap;
+struct zpci_iomap_entry *zpci_iomap_start;
+EXPORT_SYMBOL_GPL(zpci_iomap_start);
+
+DEFINE_STATIC_KEY_FALSE(have_mio);
+
+static struct kmem_cache *zdev_fmb_cache;
+
+struct zpci_dev *get_zdev_by_fid(u32 fid)
+{
+ struct zpci_dev *tmp, *zdev = NULL;
+
+ spin_lock(&zpci_list_lock);
+ list_for_each_entry(tmp, &zpci_list, entry) {
+ if (tmp->fid == fid) {
+ zdev = tmp;
+ zpci_zdev_get(zdev);
+ break;
+ }
+ }
+ spin_unlock(&zpci_list_lock);
+ return zdev;
+}
+
+void zpci_remove_reserved_devices(void)
+{
+ struct zpci_dev *tmp, *zdev;
+ enum zpci_state state;
+ LIST_HEAD(remove);
+
+ spin_lock(&zpci_list_lock);
+ list_for_each_entry_safe(zdev, tmp, &zpci_list, entry) {
+ if (zdev->state == ZPCI_FN_STATE_STANDBY &&
+ !clp_get_state(zdev->fid, &state) &&
+ state == ZPCI_FN_STATE_RESERVED)
+ list_move_tail(&zdev->entry, &remove);
+ }
+ spin_unlock(&zpci_list_lock);
+
+ list_for_each_entry_safe(zdev, tmp, &remove, entry)
+ zpci_device_reserved(zdev);
+}
+
+int pci_domain_nr(struct pci_bus *bus)
+{
+ return ((struct zpci_bus *) bus->sysdata)->domain_nr;
+}
+EXPORT_SYMBOL_GPL(pci_domain_nr);
+
+int pci_proc_domain(struct pci_bus *bus)
+{
+ return pci_domain_nr(bus);
+}
+EXPORT_SYMBOL_GPL(pci_proc_domain);
+
+/* Modify PCI: Register I/O address translation parameters */
+int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
+ u64 base, u64 limit, u64 iota)
+{
+ u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_REG_IOAT);
+ struct zpci_fib fib = {0};
+ u8 status;
+
+ WARN_ON_ONCE(iota & 0x3fff);
+ fib.pba = base;
+ fib.pal = limit;
+ fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
+ return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
+}
+
+/* Modify PCI: Unregister I/O address translation parameters */
+int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
+{
+ u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, ZPCI_MOD_FC_DEREG_IOAT);
+ struct zpci_fib fib = {0};
+ u8 cc, status;
+
+ cc = zpci_mod_fc(req, &fib, &status);
+ if (cc == 3) /* Function already gone. */
+ cc = 0;
+ return cc ? -EIO : 0;
+}
+
+/* Modify PCI: Set PCI function measurement parameters */
+int zpci_fmb_enable_device(struct zpci_dev *zdev)
+{
+ u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
+ struct zpci_fib fib = {0};
+ u8 cc, status;
+
+ if (zdev->fmb || sizeof(*zdev->fmb) < zdev->fmb_length)
+ return -EINVAL;
+
+ zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
+ if (!zdev->fmb)
+ return -ENOMEM;
+ WARN_ON((u64) zdev->fmb & 0xf);
+
+ /* reset software counters */
+ atomic64_set(&zdev->allocated_pages, 0);
+ atomic64_set(&zdev->mapped_pages, 0);
+ atomic64_set(&zdev->unmapped_pages, 0);
+
+ fib.fmb_addr = virt_to_phys(zdev->fmb);
+ cc = zpci_mod_fc(req, &fib, &status);
+ if (cc) {
+ kmem_cache_free(zdev_fmb_cache, zdev->fmb);
+ zdev->fmb = NULL;
+ }
+ return cc ? -EIO : 0;
+}
+
+/* Modify PCI: Disable PCI function measurement */
+int zpci_fmb_disable_device(struct zpci_dev *zdev)
+{
+ u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_SET_MEASURE);
+ struct zpci_fib fib = {0};
+ u8 cc, status;
+
+ if (!zdev->fmb)
+ return -EINVAL;
+
+ /* Function measurement is disabled if fmb address is zero */
+ cc = zpci_mod_fc(req, &fib, &status);
+ if (cc == 3) /* Function already gone. */
+ cc = 0;
+
+ if (!cc) {
+ kmem_cache_free(zdev_fmb_cache, zdev->fmb);
+ zdev->fmb = NULL;
+ }
+ return cc ? -EIO : 0;
+}
+
+static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
+{
+ u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
+ u64 data;
+ int rc;
+
+ rc = __zpci_load(&data, req, offset);
+ if (!rc) {
+ data = le64_to_cpu((__force __le64) data);
+ data >>= (8 - len) * 8;
+ *val = (u32) data;
+ } else
+ *val = 0xffffffff;
+ return rc;
+}
+
+static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
+{
+ u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
+ u64 data = val;
+ int rc;
+
+ data <<= (8 - len) * 8;
+ data = (__force u64) cpu_to_le64(data);
+ rc = __zpci_store(data, req, offset);
+ return rc;
+}
+
+resource_size_t pcibios_align_resource(void *data, const struct resource *res,
+ resource_size_t size,
+ resource_size_t align)
+{
+ return 0;
+}
+
+/* combine single writes by using store-block insn */
+void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
+{
+ zpci_memcpy_toio(to, from, count);
+}
+
+static void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot)
+{
+ unsigned long offset, vaddr;
+ struct vm_struct *area;
+ phys_addr_t last_addr;
+
+ last_addr = addr + size - 1;
+ if (!size || last_addr < addr)
+ return NULL;
+
+ if (!static_branch_unlikely(&have_mio))
+ return (void __iomem *) addr;
+
+ offset = addr & ~PAGE_MASK;
+ addr &= PAGE_MASK;
+ size = PAGE_ALIGN(size + offset);
+ area = get_vm_area(size, VM_IOREMAP);
+ if (!area)
+ return NULL;
+
+ vaddr = (unsigned long) area->addr;
+ if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
+ free_vm_area(area);
+ return NULL;
+ }
+ return (void __iomem *) ((unsigned long) area->addr + offset);
+}
+
+void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
+{
+ return __ioremap(addr, size, __pgprot(prot));
+}
+EXPORT_SYMBOL(ioremap_prot);
+
+void __iomem *ioremap(phys_addr_t addr, size_t size)
+{
+ return __ioremap(addr, size, PAGE_KERNEL);
+}
+EXPORT_SYMBOL(ioremap);
+
+void __iomem *ioremap_wc(phys_addr_t addr, size_t size)
+{
+ return __ioremap(addr, size, pgprot_writecombine(PAGE_KERNEL));
+}
+EXPORT_SYMBOL(ioremap_wc);
+
+void __iomem *ioremap_wt(phys_addr_t addr, size_t size)
+{
+ return __ioremap(addr, size, pgprot_writethrough(PAGE_KERNEL));
+}
+EXPORT_SYMBOL(ioremap_wt);
+
+void iounmap(volatile void __iomem *addr)
+{
+ if (static_branch_likely(&have_mio))
+ vunmap((__force void *) ((unsigned long) addr & PAGE_MASK));
+}
+EXPORT_SYMBOL(iounmap);
+
+/* Create a virtual mapping cookie for a PCI BAR */
+static void __iomem *pci_iomap_range_fh(struct pci_dev *pdev, int bar,
+ unsigned long offset, unsigned long max)
+{
+ struct zpci_dev *zdev = to_zpci(pdev);
+ int idx;
+
+ idx = zdev->bars[bar].map_idx;
+ spin_lock(&zpci_iomap_lock);
+ /* Detect overrun */
+ WARN_ON(!++zpci_iomap_start[idx].count);
+ zpci_iomap_start[idx].fh = zdev->fh;
+ zpci_iomap_start[idx].bar = bar;
+ spin_unlock(&zpci_iomap_lock);
+
+ return (void __iomem *) ZPCI_ADDR(idx) + offset;
+}
+
+static void __iomem *pci_iomap_range_mio(struct pci_dev *pdev, int bar,
+ unsigned long offset,
+ unsigned long max)
+{
+ unsigned long barsize = pci_resource_len(pdev, bar);
+ struct zpci_dev *zdev = to_zpci(pdev);
+ void __iomem *iova;
+
+ iova = ioremap((unsigned long) zdev->bars[bar].mio_wt, barsize);
+ return iova ? iova + offset : iova;
+}
+
+void __iomem *pci_iomap_range(struct pci_dev *pdev, int bar,
+ unsigned long offset, unsigned long max)
+{
+ if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
+ return NULL;
+
+ if (static_branch_likely(&have_mio))
+ return pci_iomap_range_mio(pdev, bar, offset, max);
+ else
+ return pci_iomap_range_fh(pdev, bar, offset, max);
+}
+EXPORT_SYMBOL(pci_iomap_range);
+
+void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
+{
+ return pci_iomap_range(dev, bar, 0, maxlen);
+}
+EXPORT_SYMBOL(pci_iomap);
+
+static void __iomem *pci_iomap_wc_range_mio(struct pci_dev *pdev, int bar,
+ unsigned long offset, unsigned long max)
+{
+ unsigned long barsize = pci_resource_len(pdev, bar);
+ struct zpci_dev *zdev = to_zpci(pdev);
+ void __iomem *iova;
+
+ iova = ioremap((unsigned long) zdev->bars[bar].mio_wb, barsize);
+ return iova ? iova + offset : iova;
+}
+
+void __iomem *pci_iomap_wc_range(struct pci_dev *pdev, int bar,
+ unsigned long offset, unsigned long max)
+{
+ if (bar >= PCI_STD_NUM_BARS || !pci_resource_len(pdev, bar))
+ return NULL;
+
+ if (static_branch_likely(&have_mio))
+ return pci_iomap_wc_range_mio(pdev, bar, offset, max);
+ else
+ return pci_iomap_range_fh(pdev, bar, offset, max);
+}
+EXPORT_SYMBOL(pci_iomap_wc_range);
+
+void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
+{
+ return pci_iomap_wc_range(dev, bar, 0, maxlen);
+}
+EXPORT_SYMBOL(pci_iomap_wc);
+
+static void pci_iounmap_fh(struct pci_dev *pdev, void __iomem *addr)
+{
+ unsigned int idx = ZPCI_IDX(addr);
+
+ spin_lock(&zpci_iomap_lock);
+ /* Detect underrun */
+ WARN_ON(!zpci_iomap_start[idx].count);
+ if (!--zpci_iomap_start[idx].count) {
+ zpci_iomap_start[idx].fh = 0;
+ zpci_iomap_start[idx].bar = 0;
+ }
+ spin_unlock(&zpci_iomap_lock);
+}
+
+static void pci_iounmap_mio(struct pci_dev *pdev, void __iomem *addr)
+{
+ iounmap(addr);
+}
+
+void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
+{
+ if (static_branch_likely(&have_mio))
+ pci_iounmap_mio(pdev, addr);
+ else
+ pci_iounmap_fh(pdev, addr);
+}
+EXPORT_SYMBOL(pci_iounmap);
+
+static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
+ int size, u32 *val)
+{
+ struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
+
+ return (zdev) ? zpci_cfg_load(zdev, where, val, size) : -ENODEV;
+}
+
+static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
+ int size, u32 val)
+{
+ struct zpci_dev *zdev = get_zdev_by_bus(bus, devfn);
+
+ return (zdev) ? zpci_cfg_store(zdev, where, val, size) : -ENODEV;
+}
+
+static struct pci_ops pci_root_ops = {
+ .read = pci_read,
+ .write = pci_write,
+};
+
+static void zpci_map_resources(struct pci_dev *pdev)
+{
+ struct zpci_dev *zdev = to_zpci(pdev);
+ resource_size_t len;
+ int i;
+
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
+ len = pci_resource_len(pdev, i);
+ if (!len)
+ continue;
+
+ if (zpci_use_mio(zdev))
+ pdev->resource[i].start =
+ (resource_size_t __force) zdev->bars[i].mio_wt;
+ else
+ pdev->resource[i].start = (resource_size_t __force)
+ pci_iomap_range_fh(pdev, i, 0, 0);
+ pdev->resource[i].end = pdev->resource[i].start + len - 1;
+ }
+
+ zpci_iov_map_resources(pdev);
+}
+
+static void zpci_unmap_resources(struct pci_dev *pdev)
+{
+ struct zpci_dev *zdev = to_zpci(pdev);
+ resource_size_t len;
+ int i;
+
+ if (zpci_use_mio(zdev))
+ return;
+
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
+ len = pci_resource_len(pdev, i);
+ if (!len)
+ continue;
+ pci_iounmap_fh(pdev, (void __iomem __force *)
+ pdev->resource[i].start);
+ }
+}
+
+static int zpci_alloc_iomap(struct zpci_dev *zdev)
+{
+ unsigned long entry;
+
+ spin_lock(&zpci_iomap_lock);
+ entry = find_first_zero_bit(zpci_iomap_bitmap, ZPCI_IOMAP_ENTRIES);
+ if (entry == ZPCI_IOMAP_ENTRIES) {
+ spin_unlock(&zpci_iomap_lock);
+ return -ENOSPC;
+ }
+ set_bit(entry, zpci_iomap_bitmap);
+ spin_unlock(&zpci_iomap_lock);
+ return entry;
+}
+
+static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
+{
+ spin_lock(&zpci_iomap_lock);
+ memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
+ clear_bit(entry, zpci_iomap_bitmap);
+ spin_unlock(&zpci_iomap_lock);
+}
+
+static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
+ unsigned long size, unsigned long flags)
+{
+ struct resource *r;
+
+ r = kzalloc(sizeof(*r), GFP_KERNEL);
+ if (!r)
+ return NULL;
+
+ r->start = start;
+ r->end = r->start + size - 1;
+ r->flags = flags;
+ r->name = zdev->res_name;
+
+ if (request_resource(&iomem_resource, r)) {
+ kfree(r);
+ return NULL;
+ }
+ return r;
+}
+
+int zpci_setup_bus_resources(struct zpci_dev *zdev,
+ struct list_head *resources)
+{
+ unsigned long addr, size, flags;
+ struct resource *res;
+ int i, entry;
+
+ snprintf(zdev->res_name, sizeof(zdev->res_name),
+ "PCI Bus %04x:%02x", zdev->uid, ZPCI_BUS_NR);
+
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
+ if (!zdev->bars[i].size)
+ continue;
+ entry = zpci_alloc_iomap(zdev);
+ if (entry < 0)
+ return entry;
+ zdev->bars[i].map_idx = entry;
+
+ /* only MMIO is supported */
+ flags = IORESOURCE_MEM;
+ if (zdev->bars[i].val & 8)
+ flags |= IORESOURCE_PREFETCH;
+ if (zdev->bars[i].val & 4)
+ flags |= IORESOURCE_MEM_64;
+
+ if (zpci_use_mio(zdev))
+ addr = (unsigned long) zdev->bars[i].mio_wt;
+ else
+ addr = ZPCI_ADDR(entry);
+ size = 1UL << zdev->bars[i].size;
+
+ res = __alloc_res(zdev, addr, size, flags);
+ if (!res) {
+ zpci_free_iomap(zdev, entry);
+ return -ENOMEM;
+ }
+ zdev->bars[i].res = res;
+ pci_add_resource(resources, res);
+ }
+
+ return 0;
+}
+
+static void zpci_cleanup_bus_resources(struct zpci_dev *zdev)
+{
+ int i;
+
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
+ if (!zdev->bars[i].size || !zdev->bars[i].res)
+ continue;
+
+ zpci_free_iomap(zdev, zdev->bars[i].map_idx);
+ release_resource(zdev->bars[i].res);
+ kfree(zdev->bars[i].res);
+ }
+}
+
+int pcibios_add_device(struct pci_dev *pdev)
+{
+ struct zpci_dev *zdev = to_zpci(pdev);
+ struct resource *res;
+ int i;
+
+ /* The pdev has a reference to the zdev via its bus */
+ zpci_zdev_get(zdev);
+ if (pdev->is_physfn)
+ pdev->no_vf_scan = 1;
+
+ pdev->dev.groups = zpci_attr_groups;
+ pdev->dev.dma_ops = &s390_pci_dma_ops;
+ zpci_map_resources(pdev);
+
+ for (i = 0; i < PCI_STD_NUM_BARS; i++) {
+ res = &pdev->resource[i];
+ if (res->parent || !res->flags)
+ continue;
+ pci_claim_resource(pdev, i);
+ }
+
+ return 0;
+}
+
+void pcibios_release_device(struct pci_dev *pdev)
+{
+ struct zpci_dev *zdev = to_zpci(pdev);
+
+ zpci_unmap_resources(pdev);
+ zpci_zdev_put(zdev);
+}
+
+int pcibios_enable_device(struct pci_dev *pdev, int mask)
+{
+ struct zpci_dev *zdev = to_zpci(pdev);
+
+ zpci_debug_init_device(zdev, dev_name(&pdev->dev));
+ zpci_fmb_enable_device(zdev);
+
+ return pci_enable_resources(pdev, mask);
+}
+
+void pcibios_disable_device(struct pci_dev *pdev)
+{
+ struct zpci_dev *zdev = to_zpci(pdev);
+
+ zpci_fmb_disable_device(zdev);
+ zpci_debug_exit_device(zdev);
+}
+
+static int __zpci_register_domain(int domain)
+{
+ spin_lock(&zpci_domain_lock);
+ if (test_bit(domain, zpci_domain)) {
+ spin_unlock(&zpci_domain_lock);
+ pr_err("Domain %04x is already assigned\n", domain);
+ return -EEXIST;
+ }
+ set_bit(domain, zpci_domain);
+ spin_unlock(&zpci_domain_lock);
+ return domain;
+}
+
+static int __zpci_alloc_domain(void)
+{
+ int domain;
+
+ spin_lock(&zpci_domain_lock);
+ /*
+ * We can always auto allocate domains below ZPCI_NR_DEVICES.
+ * There is either a free domain or we have reached the maximum in
+ * which case we would have bailed earlier.
+ */
+ domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
+ set_bit(domain, zpci_domain);
+ spin_unlock(&zpci_domain_lock);
+ return domain;
+}
+
+int zpci_alloc_domain(int domain)
+{
+ if (zpci_unique_uid) {
+ if (domain)
+ return __zpci_register_domain(domain);
+ pr_warn("UID checking was active but no UID is provided: switching to automatic domain allocation\n");
+ update_uid_checking(false);
+ }
+ return __zpci_alloc_domain();
+}
+
+void zpci_free_domain(int domain)
+{
+ spin_lock(&zpci_domain_lock);
+ clear_bit(domain, zpci_domain);
+ spin_unlock(&zpci_domain_lock);
+}
+
+
+int zpci_enable_device(struct zpci_dev *zdev)
+{
+ int rc;
+
+ if (clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES)) {
+ rc = -EIO;
+ goto out;
+ }
+
+ rc = zpci_dma_init_device(zdev);
+ if (rc)
+ goto out_dma;
+
+ zdev->state = ZPCI_FN_STATE_ONLINE;
+ return 0;
+
+out_dma:
+ clp_disable_fh(zdev);
+out:
+ return rc;
+}
+EXPORT_SYMBOL_GPL(zpci_enable_device);
+
+int zpci_disable_device(struct zpci_dev *zdev)
+{
+ zpci_dma_exit_device(zdev);
+ /*
+ * The zPCI function may already be disabled by the platform, this is
+ * detected in clp_disable_fh() which becomes a no-op.
+ */
+ return clp_disable_fh(zdev) ? -EIO : 0;
+}
+EXPORT_SYMBOL_GPL(zpci_disable_device);
+
+/* zpci_remove_device - Removes the given zdev from the PCI core
+ * @zdev: the zdev to be removed from the PCI core
+ * @set_error: if true the device's error state is set to permanent failure
+ *
+ * Sets a zPCI device to a configured but offline state; the zPCI
+ * device is still accessible through its hotplug slot and the zPCI
+ * API but is removed from the common code PCI bus, making it
+ * no longer available to drivers.
+ */
+void zpci_remove_device(struct zpci_dev *zdev, bool set_error)
+{
+ struct zpci_bus *zbus = zdev->zbus;
+ struct pci_dev *pdev;
+
+ if (!zdev->zbus->bus)
+ return;
+
+ pdev = pci_get_slot(zbus->bus, zdev->devfn);
+ if (pdev) {
+ if (set_error)
+ pdev->error_state = pci_channel_io_perm_failure;
+ if (pdev->is_virtfn) {
+ zpci_iov_remove_virtfn(pdev, zdev->vfn);
+ /* balance pci_get_slot */
+ pci_dev_put(pdev);
+ return;
+ }
+ pci_stop_and_remove_bus_device_locked(pdev);
+ /* balance pci_get_slot */
+ pci_dev_put(pdev);
+ }
+}
+
+/**
+ * zpci_create_device() - Create a new zpci_dev and add it to the zbus
+ * @fid: Function ID of the device to be created
+ * @fh: Current Function Handle of the device to be created
+ * @state: Initial state after creation either Standby or Configured
+ *
+ * Creates a new zpci device and adds it to its, possibly newly created, zbus
+ * as well as zpci_list.
+ *
+ * Returns: 0 on success, an error value otherwise
+ */
+int zpci_create_device(u32 fid, u32 fh, enum zpci_state state)
+{
+ struct zpci_dev *zdev;
+ int rc;
+
+ zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, state);
+ zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
+ if (!zdev)
+ return -ENOMEM;
+
+ /* FID and Function Handle are the static/dynamic identifiers */
+ zdev->fid = fid;
+ zdev->fh = fh;
+
+ /* Query function properties and update zdev */
+ rc = clp_query_pci_fn(zdev);
+ if (rc)
+ goto error;
+ zdev->state = state;
+
+ kref_init(&zdev->kref);
+ mutex_init(&zdev->lock);
+
+ rc = zpci_init_iommu(zdev);
+ if (rc)
+ goto error;
+
+ if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
+ rc = zpci_enable_device(zdev);
+ if (rc)
+ goto error_destroy_iommu;
+ }
+
+ rc = zpci_bus_device_register(zdev, &pci_root_ops);
+ if (rc)
+ goto error_disable;
+
+ spin_lock(&zpci_list_lock);
+ list_add_tail(&zdev->entry, &zpci_list);
+ spin_unlock(&zpci_list_lock);
+
+ return 0;
+
+error_disable:
+ if (zdev->state == ZPCI_FN_STATE_ONLINE)
+ zpci_disable_device(zdev);
+error_destroy_iommu:
+ zpci_destroy_iommu(zdev);
+error:
+ zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
+ kfree(zdev);
+ return rc;
+}
+
+bool zpci_is_device_configured(struct zpci_dev *zdev)
+{
+ enum zpci_state state = zdev->state;
+
+ return state != ZPCI_FN_STATE_RESERVED &&
+ state != ZPCI_FN_STATE_STANDBY;
+}
+
+/**
+ * zpci_device_reserved() - Mark device as resverved
+ * @zdev: the zpci_dev that was reserved
+ *
+ * Handle the case that a given zPCI function was reserved by another system.
+ * After a call to this function the zpci_dev can not be found via
+ * get_zdev_by_fid() anymore but may still be accessible via existing
+ * references though it will not be functional anymore.
+ */
+void zpci_device_reserved(struct zpci_dev *zdev)
+{
+ if (zdev->has_hp_slot)
+ zpci_exit_slot(zdev);
+ /*
+ * Remove device from zpci_list as it is going away. This also
+ * makes sure we ignore subsequent zPCI events for this device.
+ */
+ spin_lock(&zpci_list_lock);
+ list_del(&zdev->entry);
+ spin_unlock(&zpci_list_lock);
+ zdev->state = ZPCI_FN_STATE_RESERVED;
+ zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
+ zpci_zdev_put(zdev);
+}
+
+void zpci_release_device(struct kref *kref)
+{
+ struct zpci_dev *zdev = container_of(kref, struct zpci_dev, kref);
+
+ if (zdev->zbus->bus)
+ zpci_remove_device(zdev, false);
+
+ switch (zdev->state) {
+ case ZPCI_FN_STATE_ONLINE:
+ case ZPCI_FN_STATE_CONFIGURED:
+ zpci_disable_device(zdev);
+ fallthrough;
+ case ZPCI_FN_STATE_STANDBY:
+ if (zdev->has_hp_slot)
+ zpci_exit_slot(zdev);
+ spin_lock(&zpci_list_lock);
+ list_del(&zdev->entry);
+ spin_unlock(&zpci_list_lock);
+ zpci_dbg(3, "rsv fid:%x\n", zdev->fid);
+ fallthrough;
+ case ZPCI_FN_STATE_RESERVED:
+ zpci_cleanup_bus_resources(zdev);
+ zpci_bus_device_unregister(zdev);
+ zpci_destroy_iommu(zdev);
+ fallthrough;
+ default:
+ break;
+ }
+ zpci_dbg(3, "rem fid:%x\n", zdev->fid);
+ kfree(zdev);
+}
+
+int zpci_report_error(struct pci_dev *pdev,
+ struct zpci_report_error_header *report)
+{
+ struct zpci_dev *zdev = to_zpci(pdev);
+
+ return sclp_pci_report(report, zdev->fh, zdev->fid);
+}
+EXPORT_SYMBOL(zpci_report_error);
+
+static int zpci_mem_init(void)
+{
+ BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||
+ __alignof__(struct zpci_fmb) < sizeof(struct zpci_fmb));
+
+ zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
+ __alignof__(struct zpci_fmb), 0, NULL);
+ if (!zdev_fmb_cache)
+ goto error_fmb;
+
+ zpci_iomap_start = kcalloc(ZPCI_IOMAP_ENTRIES,
+ sizeof(*zpci_iomap_start), GFP_KERNEL);
+ if (!zpci_iomap_start)
+ goto error_iomap;
+
+ zpci_iomap_bitmap = kcalloc(BITS_TO_LONGS(ZPCI_IOMAP_ENTRIES),
+ sizeof(*zpci_iomap_bitmap), GFP_KERNEL);
+ if (!zpci_iomap_bitmap)
+ goto error_iomap_bitmap;
+
+ if (static_branch_likely(&have_mio))
+ clp_setup_writeback_mio();
+
+ return 0;
+error_iomap_bitmap:
+ kfree(zpci_iomap_start);
+error_iomap:
+ kmem_cache_destroy(zdev_fmb_cache);
+error_fmb:
+ return -ENOMEM;
+}
+
+static void zpci_mem_exit(void)
+{
+ kfree(zpci_iomap_bitmap);
+ kfree(zpci_iomap_start);
+ kmem_cache_destroy(zdev_fmb_cache);
+}
+
+static unsigned int s390_pci_probe __initdata = 1;
+unsigned int s390_pci_force_floating __initdata;
+static unsigned int s390_pci_initialized;
+
+char * __init pcibios_setup(char *str)
+{
+ if (!strcmp(str, "off")) {
+ s390_pci_probe = 0;
+ return NULL;
+ }
+ if (!strcmp(str, "nomio")) {
+ S390_lowcore.machine_flags &= ~MACHINE_FLAG_PCI_MIO;
+ return NULL;
+ }
+ if (!strcmp(str, "force_floating")) {
+ s390_pci_force_floating = 1;
+ return NULL;
+ }
+ if (!strcmp(str, "norid")) {
+ s390_pci_no_rid = 1;
+ return NULL;
+ }
+ return str;
+}
+
+bool zpci_is_enabled(void)
+{
+ return s390_pci_initialized;
+}
+
+static int __init pci_base_init(void)
+{
+ int rc;
+
+ if (!s390_pci_probe)
+ return 0;
+
+ if (!test_facility(69) || !test_facility(71))
+ return 0;
+
+ if (MACHINE_HAS_PCI_MIO) {
+ static_branch_enable(&have_mio);
+ ctl_set_bit(2, 5);
+ }
+
+ rc = zpci_debug_init();
+ if (rc)
+ goto out;
+
+ rc = zpci_mem_init();
+ if (rc)
+ goto out_mem;
+
+ rc = zpci_irq_init();
+ if (rc)
+ goto out_irq;
+
+ rc = zpci_dma_init();
+ if (rc)
+ goto out_dma;
+
+ rc = clp_scan_pci_devices();
+ if (rc)
+ goto out_find;
+
+ s390_pci_initialized = 1;
+ return 0;
+
+out_find:
+ zpci_dma_exit();
+out_dma:
+ zpci_irq_exit();
+out_irq:
+ zpci_mem_exit();
+out_mem:
+ zpci_debug_exit();
+out:
+ return rc;
+}
+subsys_initcall_sync(pci_base_init);