swh:1:snp:49cd9498d6cccc5e78252c27dcb645bcf7bf0c91
Tip revision: 672c0c5173427e6b3e2a9bbb7be51ceeec78093a authored by Linus Torvalds on 01 May 2022, 20:57:58 UTC
Linux 5.18-rc5
Linux 5.18-rc5
Tip revision: 672c0c5
pci.c
// 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 cc, status;
WARN_ON_ONCE(iota & 0x3fff);
fib.pba = base;
fib.pal = limit;
fib.iota = iota | ZPCI_IOTA_RTTO_FLAG;
cc = zpci_mod_fc(req, &fib, &status);
if (cc)
zpci_dbg(3, "reg ioat fid:%x, cc:%d, status:%d\n", zdev->fid, cc, status);
return cc;
}
/* 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)
zpci_dbg(3, "unreg ioat fid:%x, cc:%d, status:%d\n", zdev->fid, cc, status);
return cc;
}
/* 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 = zdev_from_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 = zdev_from_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 void zpci_do_update_iomap_fh(struct zpci_dev *zdev, u32 fh)
{
int bar, idx;
spin_lock(&zpci_iomap_lock);
for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
if (!zdev->bars[bar].size)
continue;
idx = zdev->bars[bar].map_idx;
if (!zpci_iomap_start[idx].count)
continue;
WRITE_ONCE(zpci_iomap_start[idx].fh, zdev->fh);
}
spin_unlock(&zpci_iomap_lock);
}
void zpci_update_fh(struct zpci_dev *zdev, u32 fh)
{
if (!fh || zdev->fh == fh)
return;
zdev->fh = fh;
if (zpci_use_mio(zdev))
return;
if (zdev->has_resources && zdev_enabled(zdev))
zpci_do_update_iomap_fh(zdev, fh);
}
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);
}
zdev->has_resources = 1;
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);
}
zdev->has_resources = 0;
}
int pcibios_device_add(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)
{
u32 fh = zdev->fh;
int rc = 0;
if (clp_enable_fh(zdev, &fh, ZPCI_NR_DMA_SPACES))
rc = -EIO;
else
zpci_update_fh(zdev, fh);
return rc;
}
int zpci_disable_device(struct zpci_dev *zdev)
{
u32 fh = zdev->fh;
int cc, rc = 0;
cc = clp_disable_fh(zdev, &fh);
if (!cc) {
zpci_update_fh(zdev, fh);
} else if (cc == CLP_RC_SETPCIFN_ALRDY) {
pr_info("Disabling PCI function %08x had no effect as it was already disabled\n",
zdev->fid);
/* Function is already disabled - update handle */
rc = clp_refresh_fh(zdev->fid, &fh);
if (!rc) {
zpci_update_fh(zdev, fh);
rc = -EINVAL;
}
} else {
rc = -EIO;
}
return rc;
}
/**
* zpci_hot_reset_device - perform a reset of the given zPCI function
* @zdev: the slot which should be reset
*
* Performs a low level reset of the zPCI function. The reset is low level in
* the sense that the zPCI function can be reset without detaching it from the
* common PCI subsystem. The reset may be performed while under control of
* either DMA or IOMMU APIs in which case the existing DMA/IOMMU translation
* table is reinstated at the end of the reset.
*
* After the reset the functions internal state is reset to an initial state
* equivalent to its state during boot when first probing a driver.
* Consequently after reset the PCI function requires re-initialization via the
* common PCI code including re-enabling IRQs via pci_alloc_irq_vectors()
* and enabling the function via e.g.pci_enablde_device_flags().The caller
* must guard against concurrent reset attempts.
*
* In most cases this function should not be called directly but through
* pci_reset_function() or pci_reset_bus() which handle the save/restore and
* locking.
*
* Return: 0 on success and an error value otherwise
*/
int zpci_hot_reset_device(struct zpci_dev *zdev)
{
int rc;
zpci_dbg(3, "rst fid:%x, fh:%x\n", zdev->fid, zdev->fh);
if (zdev_enabled(zdev)) {
/* Disables device access, DMAs and IRQs (reset state) */
rc = zpci_disable_device(zdev);
/*
* Due to a z/VM vs LPAR inconsistency in the error state the
* FH may indicate an enabled device but disable says the
* device is already disabled don't treat it as an error here.
*/
if (rc == -EINVAL)
rc = 0;
if (rc)
return rc;
}
rc = zpci_enable_device(zdev);
if (rc)
return rc;
if (zdev->dma_table)
rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
virt_to_phys(zdev->dma_table));
else
rc = zpci_dma_init_device(zdev);
if (rc) {
zpci_disable_device(zdev);
return rc;
}
return 0;
}
/**
* 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: the zdev on success or an error pointer otherwise
*/
struct zpci_dev *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 ERR_PTR(-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;
rc = zpci_bus_device_register(zdev, &pci_root_ops);
if (rc)
goto error_destroy_iommu;
spin_lock(&zpci_list_lock);
list_add_tail(&zdev->entry, &zpci_list);
spin_unlock(&zpci_list_lock);
return zdev;
error_destroy_iommu:
zpci_destroy_iommu(zdev);
error:
zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
kfree(zdev);
return ERR_PTR(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_scan_configured_device() - Scan a freshly configured zpci_dev
* @zdev: The zpci_dev to be configured
* @fh: The general function handle supplied by the platform
*
* Given a device in the configuration state Configured, enables, scans and
* adds it to the common code PCI subsystem if possible. If the PCI device is
* parked because we can not yet create a PCI bus because we have not seen
* function 0, it is ignored but will be scanned once function 0 appears.
* If any failure occurs, the zpci_dev is left disabled.
*
* Return: 0 on success, or an error code otherwise
*/
int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh)
{
int rc;
zpci_update_fh(zdev, fh);
/* the PCI function will be scanned once function 0 appears */
if (!zdev->zbus->bus)
return 0;
/* For function 0 on a multi-function bus scan whole bus as we might
* have to pick up existing functions waiting for it to allow creating
* the PCI bus
*/
if (zdev->devfn == 0 && zdev->zbus->multifunction)
rc = zpci_bus_scan_bus(zdev->zbus);
else
rc = zpci_bus_scan_device(zdev);
return rc;
}
/**
* zpci_deconfigure_device() - Deconfigure a zpci_dev
* @zdev: The zpci_dev to configure
*
* Deconfigure a zPCI function that is currently configured and possibly known
* to the common code PCI subsystem.
* If any failure occurs the device is left as is.
*
* Return: 0 on success, or an error code otherwise
*/
int zpci_deconfigure_device(struct zpci_dev *zdev)
{
int rc;
if (zdev->zbus->bus)
zpci_bus_remove_device(zdev, false);
if (zdev->dma_table) {
rc = zpci_dma_exit_device(zdev);
if (rc)
return rc;
}
if (zdev_enabled(zdev)) {
rc = zpci_disable_device(zdev);
if (rc)
return rc;
}
rc = sclp_pci_deconfigure(zdev->fid);
zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, rc);
if (rc)
return rc;
zdev->state = ZPCI_FN_STATE_STANDBY;
return 0;
}
/**
* 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);
int ret;
if (zdev->zbus->bus)
zpci_bus_remove_device(zdev, false);
if (zdev->dma_table)
zpci_dma_exit_device(zdev);
if (zdev_enabled(zdev))
zpci_disable_device(zdev);
switch (zdev->state) {
case ZPCI_FN_STATE_CONFIGURED:
ret = sclp_pci_deconfigure(zdev->fid);
zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
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:
if (zdev->has_resources)
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);
/**
* zpci_clear_error_state() - Clears the zPCI error state of the device
* @zdev: The zdev for which the zPCI error state should be reset
*
* Clear the zPCI error state of the device. If clearing the zPCI error state
* fails the device is left in the error state. In this case it may make sense
* to call zpci_io_perm_failure() on the associated pdev if it exists.
*
* Returns: 0 on success, -EIO otherwise
*/
int zpci_clear_error_state(struct zpci_dev *zdev)
{
u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_RESET_ERROR);
struct zpci_fib fib = {0};
u8 status;
int cc;
cc = zpci_mod_fc(req, &fib, &status);
if (cc) {
zpci_dbg(3, "ces fid:%x, cc:%d, status:%x\n", zdev->fid, cc, status);
return -EIO;
}
return 0;
}
/**
* zpci_reset_load_store_blocked() - Re-enables L/S from error state
* @zdev: The zdev for which to unblock load/store access
*
* Re-enables load/store access for a PCI function in the error state while
* keeping DMA blocked. In this state drivers can poke MMIO space to determine
* if error recovery is possible while catching any rogue DMA access from the
* device.
*
* Returns: 0 on success, -EIO otherwise
*/
int zpci_reset_load_store_blocked(struct zpci_dev *zdev)
{
u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_RESET_BLOCK);
struct zpci_fib fib = {0};
u8 status;
int cc;
cc = zpci_mod_fc(req, &fib, &status);
if (cc) {
zpci_dbg(3, "rls fid:%x, cc:%d, status:%x\n", zdev->fid, cc, status);
return -EIO;
}
return 0;
}
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)) {
pr_info("PCI is not supported because CPU facilities 69 or 71 are not available\n");
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;
zpci_bus_scan_busses();
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);