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OpenCloudOS-Kernel/arch/s390/pci/pci.c

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/*
* 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 COMPONENT "zPCI"
#define pr_fmt(fmt) COMPONENT ": " fmt
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/kernel_stat.h>
#include <linux/seq_file.h>
#include <linux/pci.h>
#include <linux/msi.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>
#define DEBUG /* enable pr_debug */
#define SIC_IRQ_MODE_ALL 0
#define SIC_IRQ_MODE_SINGLE 1
#define ZPCI_NR_DMA_SPACES 1
#define ZPCI_MSI_VEC_BITS 6
#define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS
/* list of all detected zpci devices */
LIST_HEAD(zpci_list);
EXPORT_SYMBOL_GPL(zpci_list);
DEFINE_MUTEX(zpci_list_lock);
EXPORT_SYMBOL_GPL(zpci_list_lock);
struct pci_hp_callback_ops hotplug_ops;
EXPORT_SYMBOL_GPL(hotplug_ops);
static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
static DEFINE_SPINLOCK(zpci_domain_lock);
struct callback {
irq_handler_t handler;
void *data;
};
struct zdev_irq_map {
unsigned long aibv; /* AI bit vector */
int msi_vecs; /* consecutive MSI-vectors used */
int __unused;
struct callback cb[ZPCI_NR_MSI_VECS]; /* callback handler array */
spinlock_t lock; /* protect callbacks against de-reg */
};
struct intr_bucket {
/* amap of adapters, one bit per dev, corresponds to one irq nr */
unsigned long *alloc;
/* AI summary bit, global page for all devices */
unsigned long *aisb;
/* pointer to aibv and callback data in zdev */
struct zdev_irq_map *imap[ZPCI_NR_DEVICES];
/* protects the whole bucket struct */
spinlock_t lock;
};
static struct intr_bucket *bucket;
/* Adapter local summary indicator */
static u8 *zpci_irq_si;
static atomic_t irq_retries = ATOMIC_INIT(0);
/* I/O Map */
static DEFINE_SPINLOCK(zpci_iomap_lock);
static DECLARE_BITMAP(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
struct zpci_iomap_entry *zpci_iomap_start;
EXPORT_SYMBOL_GPL(zpci_iomap_start);
/* highest irq summary bit */
static int __read_mostly aisb_max;
static struct kmem_cache *zdev_irq_cache;
static struct kmem_cache *zdev_fmb_cache;
debug_info_t *pci_debug_msg_id;
debug_info_t *pci_debug_err_id;
static inline int irq_to_msi_nr(unsigned int irq)
{
return irq & ZPCI_MSI_MASK;
}
static inline int irq_to_dev_nr(unsigned int irq)
{
return irq >> ZPCI_MSI_VEC_BITS;
}
static inline struct zdev_irq_map *get_imap(unsigned int irq)
{
return bucket->imap[irq_to_dev_nr(irq)];
}
struct zpci_dev *get_zdev(struct pci_dev *pdev)
{
return (struct zpci_dev *) pdev->sysdata;
}
struct zpci_dev *get_zdev_by_fid(u32 fid)
{
struct zpci_dev *tmp, *zdev = NULL;
mutex_lock(&zpci_list_lock);
list_for_each_entry(tmp, &zpci_list, entry) {
if (tmp->fid == fid) {
zdev = tmp;
break;
}
}
mutex_unlock(&zpci_list_lock);
return zdev;
}
bool zpci_fid_present(u32 fid)
{
return (get_zdev_by_fid(fid) != NULL) ? true : false;
}
static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
{
return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
}
int pci_domain_nr(struct pci_bus *bus)
{
return ((struct zpci_dev *) bus->sysdata)->domain;
}
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 adapter interruptions */
static int zpci_register_airq(struct zpci_dev *zdev, unsigned int aisb,
u64 aibv)
{
u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
struct zpci_fib *fib;
int rc;
fib = (void *) get_zeroed_page(GFP_KERNEL);
if (!fib)
return -ENOMEM;
fib->isc = PCI_ISC;
fib->noi = zdev->irq_map->msi_vecs;
fib->sum = 1; /* enable summary notifications */
fib->aibv = aibv;
fib->aibvo = 0; /* every function has its own page */
fib->aisb = (u64) bucket->aisb + aisb / 8;
fib->aisbo = aisb & ZPCI_MSI_MASK;
rc = mpcifc_instr(req, fib);
pr_debug("%s mpcifc returned noi: %d\n", __func__, fib->noi);
free_page((unsigned long) fib);
return rc;
}
struct mod_pci_args {
u64 base;
u64 limit;
u64 iota;
u64 fmb_addr;
};
static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args)
{
u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn);
struct zpci_fib *fib;
int rc;
/* The FIB must be available even if it's not used */
fib = (void *) get_zeroed_page(GFP_KERNEL);
if (!fib)
return -ENOMEM;
fib->pba = args->base;
fib->pal = args->limit;
fib->iota = args->iota;
fib->fmb_addr = args->fmb_addr;
rc = mpcifc_instr(req, fib);
free_page((unsigned long) fib);
return rc;
}
/* Modify PCI: Register I/O address translation parameters */
int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
u64 base, u64 limit, u64 iota)
{
struct mod_pci_args args = { base, limit, iota, 0 };
WARN_ON_ONCE(iota & 0x3fff);
args.iota |= ZPCI_IOTA_RTTO_FLAG;
return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args);
}
/* Modify PCI: Unregister I/O address translation parameters */
int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
{
struct mod_pci_args args = { 0, 0, 0, 0 };
return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args);
}
/* Modify PCI: Unregister adapter interruptions */
static int zpci_unregister_airq(struct zpci_dev *zdev)
{
struct mod_pci_args args = { 0, 0, 0, 0 };
return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args);
}
/* Modify PCI: Set PCI function measurement parameters */
int zpci_fmb_enable_device(struct zpci_dev *zdev)
{
struct mod_pci_args args = { 0, 0, 0, 0 };
if (zdev->fmb)
return -EINVAL;
zdev->fmb = kmem_cache_alloc(zdev_fmb_cache, GFP_KERNEL);
if (!zdev->fmb)
return -ENOMEM;
memset(zdev->fmb, 0, sizeof(*zdev->fmb));
WARN_ON((u64) zdev->fmb & 0xf);
args.fmb_addr = virt_to_phys(zdev->fmb);
return mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
}
/* Modify PCI: Disable PCI function measurement */
int zpci_fmb_disable_device(struct zpci_dev *zdev)
{
struct mod_pci_args args = { 0, 0, 0, 0 };
int rc;
if (!zdev->fmb)
return -EINVAL;
/* Function measurement is disabled if fmb address is zero */
rc = mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
kmem_cache_free(zdev_fmb_cache, zdev->fmb);
zdev->fmb = NULL;
return rc;
}
#define ZPCI_PCIAS_CFGSPC 15
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 = pcilg_instr(&data, req, offset);
data = data << ((8 - len) * 8);
data = le64_to_cpu(data);
if (!rc)
*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 = cpu_to_le64(data);
data = data >> ((8 - len) * 8);
rc = pcistg_instr(data, req, offset);
return rc;
}
void synchronize_irq(unsigned int irq)
{
/*
* Not needed, the handler is protected by a lock and IRQs that occur
* after the handler is deleted are just NOPs.
*/
}
EXPORT_SYMBOL_GPL(synchronize_irq);
void enable_irq(unsigned int irq)
{
struct msi_desc *msi = irq_get_msi_desc(irq);
zpci_msi_set_mask_bits(msi, 1, 0);
}
EXPORT_SYMBOL_GPL(enable_irq);
void disable_irq(unsigned int irq)
{
struct msi_desc *msi = irq_get_msi_desc(irq);
zpci_msi_set_mask_bits(msi, 1, 1);
}
EXPORT_SYMBOL_GPL(disable_irq);
void disable_irq_nosync(unsigned int irq)
{
disable_irq(irq);
}
EXPORT_SYMBOL_GPL(disable_irq_nosync);
unsigned long probe_irq_on(void)
{
return 0;
}
EXPORT_SYMBOL_GPL(probe_irq_on);
int probe_irq_off(unsigned long val)
{
return 0;
}
EXPORT_SYMBOL_GPL(probe_irq_off);
unsigned int probe_irq_mask(unsigned long val)
{
return val;
}
EXPORT_SYMBOL_GPL(probe_irq_mask);
void pcibios_fixup_bus(struct pci_bus *bus)
{
}
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);
}
/* Create a virtual mapping cookie for a PCI BAR */
void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max)
{
struct zpci_dev *zdev = get_zdev(pdev);
u64 addr;
int idx;
if ((bar & 7) != bar)
return NULL;
idx = zdev->bars[bar].map_idx;
spin_lock(&zpci_iomap_lock);
zpci_iomap_start[idx].fh = zdev->fh;
zpci_iomap_start[idx].bar = bar;
spin_unlock(&zpci_iomap_lock);
addr = ZPCI_IOMAP_ADDR_BASE | ((u64) idx << 48);
return (void __iomem *) addr;
}
EXPORT_SYMBOL_GPL(pci_iomap);
void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
{
unsigned int idx;
idx = (((__force u64) addr) & ~ZPCI_IOMAP_ADDR_BASE) >> 48;
spin_lock(&zpci_iomap_lock);
zpci_iomap_start[idx].fh = 0;
zpci_iomap_start[idx].bar = 0;
spin_unlock(&zpci_iomap_lock);
}
EXPORT_SYMBOL_GPL(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);
if (!zdev || devfn != ZPCI_DEVFN)
return 0;
return zpci_cfg_load(zdev, where, val, size);
}
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);
if (!zdev || devfn != ZPCI_DEVFN)
return 0;
return zpci_cfg_store(zdev, where, val, size);
}
static struct pci_ops pci_root_ops = {
.read = pci_read,
.write = pci_write,
};
/* store the last handled bit to implement fair scheduling of devices */
static DEFINE_PER_CPU(unsigned long, next_sbit);
static void zpci_irq_handler(void *dont, void *need)
{
unsigned long sbit, mbit, last = 0, start = __get_cpu_var(next_sbit);
int rescan = 0, max = aisb_max;
struct zdev_irq_map *imap;
inc_irq_stat(IRQIO_PCI);
sbit = start;
scan:
/* find summary_bit */
for_each_set_bit_left_cont(sbit, bucket->aisb, max) {
clear_bit(63 - (sbit & 63), bucket->aisb + (sbit >> 6));
last = sbit;
/* find vector bit */
imap = bucket->imap[sbit];
for_each_set_bit_left(mbit, &imap->aibv, imap->msi_vecs) {
inc_irq_stat(IRQIO_MSI);
clear_bit(63 - mbit, &imap->aibv);
spin_lock(&imap->lock);
if (imap->cb[mbit].handler)
imap->cb[mbit].handler(mbit,
imap->cb[mbit].data);
spin_unlock(&imap->lock);
}
}
if (rescan)
goto out;
/* scan the skipped bits */
if (start > 0) {
sbit = 0;
max = start;
start = 0;
goto scan;
}
/* enable interrupts again */
sic_instr(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
/* check again to not lose initiative */
rmb();
max = aisb_max;
sbit = find_first_bit_left(bucket->aisb, max);
if (sbit != max) {
atomic_inc(&irq_retries);
rescan++;
goto scan;
}
out:
/* store next device bit to scan */
__get_cpu_var(next_sbit) = (++last >= aisb_max) ? 0 : last;
}
/* msi_vecs - number of requested interrupts, 0 place function to error state */
static int zpci_setup_msi(struct pci_dev *pdev, int msi_vecs)
{
struct zpci_dev *zdev = get_zdev(pdev);
unsigned int aisb, msi_nr;
struct msi_desc *msi;
int rc;
/* store the number of used MSI vectors */
zdev->irq_map->msi_vecs = min(msi_vecs, ZPCI_NR_MSI_VECS);
spin_lock(&bucket->lock);
aisb = find_first_zero_bit(bucket->alloc, PAGE_SIZE);
/* alloc map exhausted? */
if (aisb == PAGE_SIZE) {
spin_unlock(&bucket->lock);
return -EIO;
}
set_bit(aisb, bucket->alloc);
spin_unlock(&bucket->lock);
zdev->aisb = aisb;
if (aisb + 1 > aisb_max)
aisb_max = aisb + 1;
/* wire up IRQ shortcut pointer */
bucket->imap[zdev->aisb] = zdev->irq_map;
pr_debug("%s: imap[%u] linked to %p\n", __func__, zdev->aisb, zdev->irq_map);
/* TODO: irq number 0 wont be found if we return less than requested MSIs.
* ignore it for now and fix in common code.
*/
msi_nr = aisb << ZPCI_MSI_VEC_BITS;
list_for_each_entry(msi, &pdev->msi_list, list) {
rc = zpci_setup_msi_irq(zdev, msi, msi_nr,
aisb << ZPCI_MSI_VEC_BITS);
if (rc)
return rc;
msi_nr++;
}
rc = zpci_register_airq(zdev, aisb, (u64) &zdev->irq_map->aibv);
if (rc) {
clear_bit(aisb, bucket->alloc);
dev_err(&pdev->dev, "register MSI failed with: %d\n", rc);
return rc;
}
return (zdev->irq_map->msi_vecs == msi_vecs) ?
0 : zdev->irq_map->msi_vecs;
}
static void zpci_teardown_msi(struct pci_dev *pdev)
{
struct zpci_dev *zdev = get_zdev(pdev);
struct msi_desc *msi;
int aisb, rc;
rc = zpci_unregister_airq(zdev);
if (rc) {
dev_err(&pdev->dev, "deregister MSI failed with: %d\n", rc);
return;
}
msi = list_first_entry(&pdev->msi_list, struct msi_desc, list);
aisb = irq_to_dev_nr(msi->irq);
list_for_each_entry(msi, &pdev->msi_list, list)
zpci_teardown_msi_irq(zdev, msi);
clear_bit(aisb, bucket->alloc);
if (aisb + 1 == aisb_max)
aisb_max--;
}
int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
{
pr_debug("%s: requesting %d MSI-X interrupts...", __func__, nvec);
if (type != PCI_CAP_ID_MSIX && type != PCI_CAP_ID_MSI)
return -EINVAL;
return zpci_setup_msi(pdev, nvec);
}
void arch_teardown_msi_irqs(struct pci_dev *pdev)
{
pr_info("%s: on pdev: %p\n", __func__, pdev);
zpci_teardown_msi(pdev);
}
static void zpci_map_resources(struct zpci_dev *zdev)
{
struct pci_dev *pdev = zdev->pdev;
resource_size_t len;
int i;
for (i = 0; i < PCI_BAR_COUNT; i++) {
len = pci_resource_len(pdev, i);
if (!len)
continue;
pdev->resource[i].start = (resource_size_t) pci_iomap(pdev, i, 0);
pdev->resource[i].end = pdev->resource[i].start + len - 1;
pr_debug("BAR%i: -> start: %Lx end: %Lx\n",
i, pdev->resource[i].start, pdev->resource[i].end);
}
};
static void zpci_unmap_resources(struct pci_dev *pdev)
{
resource_size_t len;
int i;
for (i = 0; i < PCI_BAR_COUNT; i++) {
len = pci_resource_len(pdev, i);
if (!len)
continue;
pci_iounmap(pdev, (void *) pdev->resource[i].start);
}
};
struct zpci_dev *zpci_alloc_device(void)
{
struct zpci_dev *zdev;
/* Alloc memory for our private pci device data */
zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
if (!zdev)
return ERR_PTR(-ENOMEM);
/* Alloc aibv & callback space */
zdev->irq_map = kmem_cache_zalloc(zdev_irq_cache, GFP_KERNEL);
if (!zdev->irq_map)
goto error;
WARN_ON((u64) zdev->irq_map & 0xff);
return zdev;
error:
kfree(zdev);
return ERR_PTR(-ENOMEM);
}
void zpci_free_device(struct zpci_dev *zdev)
{
kmem_cache_free(zdev_irq_cache, zdev->irq_map);
kfree(zdev);
}
/* Called on removal of pci_dev, leaves zpci and bus device */
static void zpci_remove_device(struct pci_dev *pdev)
{
struct zpci_dev *zdev = get_zdev(pdev);
dev_info(&pdev->dev, "Removing device %u\n", zdev->domain);
zdev->state = ZPCI_FN_STATE_CONFIGURED;
zpci_dma_exit_device(zdev);
zpci_fmb_disable_device(zdev);
zpci_sysfs_remove_device(&pdev->dev);
zpci_unmap_resources(pdev);
list_del(&zdev->entry); /* can be called from init */
zdev->pdev = NULL;
}
static void zpci_scan_devices(void)
{
struct zpci_dev *zdev;
mutex_lock(&zpci_list_lock);
list_for_each_entry(zdev, &zpci_list, entry)
if (zdev->state == ZPCI_FN_STATE_CONFIGURED)
zpci_scan_device(zdev);
mutex_unlock(&zpci_list_lock);
}
/*
* Too late for any s390 specific setup, since interrupts must be set up
* already which requires DMA setup too and the pci scan will access the
* config space, which only works if the function handle is enabled.
*/
int pcibios_enable_device(struct pci_dev *pdev, int mask)
{
struct resource *res;
u16 cmd;
int i;
pci_read_config_word(pdev, PCI_COMMAND, &cmd);
for (i = 0; i < PCI_BAR_COUNT; i++) {
res = &pdev->resource[i];
if (res->flags & IORESOURCE_IO)
return -EINVAL;
if (res->flags & IORESOURCE_MEM)
cmd |= PCI_COMMAND_MEMORY;
}
pci_write_config_word(pdev, PCI_COMMAND, cmd);
return 0;
}
void pcibios_disable_device(struct pci_dev *pdev)
{
zpci_remove_device(pdev);
pdev->sysdata = NULL;
}
int pcibios_add_platform_entries(struct pci_dev *pdev)
{
return zpci_sysfs_add_device(&pdev->dev);
}
int zpci_request_irq(unsigned int irq, irq_handler_t handler, void *data)
{
int msi_nr = irq_to_msi_nr(irq);
struct zdev_irq_map *imap;
struct msi_desc *msi;
msi = irq_get_msi_desc(irq);
if (!msi)
return -EIO;
imap = get_imap(irq);
spin_lock_init(&imap->lock);
pr_debug("%s: register handler for IRQ:MSI %d:%d\n", __func__, irq >> 6, msi_nr);
imap->cb[msi_nr].handler = handler;
imap->cb[msi_nr].data = data;
/*
* The generic MSI code returns with the interrupt disabled on the
* card, using the MSI mask bits. Firmware doesn't appear to unmask
* at that level, so we do it here by hand.
*/
zpci_msi_set_mask_bits(msi, 1, 0);
return 0;
}
void zpci_free_irq(unsigned int irq)
{
struct zdev_irq_map *imap = get_imap(irq);
int msi_nr = irq_to_msi_nr(irq);
unsigned long flags;
pr_debug("%s: for irq: %d\n", __func__, irq);
spin_lock_irqsave(&imap->lock, flags);
imap->cb[msi_nr].handler = NULL;
imap->cb[msi_nr].data = NULL;
spin_unlock_irqrestore(&imap->lock, flags);
}
int request_irq(unsigned int irq, irq_handler_t handler,
unsigned long irqflags, const char *devname, void *dev_id)
{
pr_debug("%s: irq: %d handler: %p flags: %lx dev: %s\n",
__func__, irq, handler, irqflags, devname);
return zpci_request_irq(irq, handler, dev_id);
}
EXPORT_SYMBOL_GPL(request_irq);
void free_irq(unsigned int irq, void *dev_id)
{
zpci_free_irq(irq);
}
EXPORT_SYMBOL_GPL(free_irq);
static int __init zpci_irq_init(void)
{
int cpu, rc;
bucket = kzalloc(sizeof(*bucket), GFP_KERNEL);
if (!bucket)
return -ENOMEM;
bucket->aisb = (unsigned long *) get_zeroed_page(GFP_KERNEL);
if (!bucket->aisb) {
rc = -ENOMEM;
goto out_aisb;
}
bucket->alloc = (unsigned long *) get_zeroed_page(GFP_KERNEL);
if (!bucket->alloc) {
rc = -ENOMEM;
goto out_alloc;
}
isc_register(PCI_ISC);
zpci_irq_si = s390_register_adapter_interrupt(&zpci_irq_handler, NULL, PCI_ISC);
if (IS_ERR(zpci_irq_si)) {
rc = PTR_ERR(zpci_irq_si);
zpci_irq_si = NULL;
goto out_ai;
}
for_each_online_cpu(cpu)
per_cpu(next_sbit, cpu) = 0;
spin_lock_init(&bucket->lock);
/* set summary to 1 to be called every time for the ISC */
*zpci_irq_si = 1;
sic_instr(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
return 0;
out_ai:
isc_unregister(PCI_ISC);
free_page((unsigned long) bucket->alloc);
out_alloc:
free_page((unsigned long) bucket->aisb);
out_aisb:
kfree(bucket);
return rc;
}
static void zpci_irq_exit(void)
{
free_page((unsigned long) bucket->alloc);
free_page((unsigned long) bucket->aisb);
s390_unregister_adapter_interrupt(zpci_irq_si, PCI_ISC);
isc_unregister(PCI_ISC);
kfree(bucket);
}
void zpci_debug_info(struct zpci_dev *zdev, struct seq_file *m)
{
if (!zdev)
return;
seq_printf(m, "global irq retries: %u\n", atomic_read(&irq_retries));
seq_printf(m, "aibv[0]:%016lx aibv[1]:%016lx aisb:%016lx\n",
get_imap(0)->aibv, get_imap(1)->aibv, *bucket->aisb);
}
static struct resource *zpci_alloc_bus_resource(unsigned long start, unsigned long size,
unsigned long flags, int domain)
{
struct resource *r;
char *name;
int rc;
r = kzalloc(sizeof(*r), GFP_KERNEL);
if (!r)
return ERR_PTR(-ENOMEM);
r->start = start;
r->end = r->start + size - 1;
r->flags = flags;
r->parent = &iomem_resource;
name = kmalloc(18, GFP_KERNEL);
if (!name) {
kfree(r);
return ERR_PTR(-ENOMEM);
}
sprintf(name, "PCI Bus: %04x:%02x", domain, ZPCI_BUS_NR);
r->name = name;
rc = request_resource(&iomem_resource, r);
if (rc)
pr_debug("request resource %pR failed\n", r);
return r;
}
static int zpci_alloc_iomap(struct zpci_dev *zdev)
{
int entry;
spin_lock(&zpci_iomap_lock);
entry = find_first_zero_bit(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
if (entry == ZPCI_IOMAP_MAX_ENTRIES) {
spin_unlock(&zpci_iomap_lock);
return -ENOSPC;
}
set_bit(entry, zpci_iomap);
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);
spin_unlock(&zpci_iomap_lock);
}
static int zpci_create_device_bus(struct zpci_dev *zdev)
{
struct resource *res;
LIST_HEAD(resources);
int i;
/* allocate mapping entry for each used bar */
for (i = 0; i < PCI_BAR_COUNT; i++) {
unsigned long addr, size, flags;
int entry;
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;
addr = ZPCI_IOMAP_ADDR_BASE + ((u64) entry << 48);
size = 1UL << zdev->bars[i].size;
res = zpci_alloc_bus_resource(addr, size, flags, zdev->domain);
if (IS_ERR(res)) {
zpci_free_iomap(zdev, entry);
return PTR_ERR(res);
}
pci_add_resource(&resources, res);
}
zdev->bus = pci_create_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
zdev, &resources);
if (!zdev->bus)
return -EIO;
zdev->bus->max_bus_speed = zdev->max_bus_speed;
return 0;
}
static int zpci_alloc_domain(struct zpci_dev *zdev)
{
spin_lock(&zpci_domain_lock);
zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
if (zdev->domain == ZPCI_NR_DEVICES) {
spin_unlock(&zpci_domain_lock);
return -ENOSPC;
}
set_bit(zdev->domain, zpci_domain);
spin_unlock(&zpci_domain_lock);
return 0;
}
static void zpci_free_domain(struct zpci_dev *zdev)
{
spin_lock(&zpci_domain_lock);
clear_bit(zdev->domain, zpci_domain);
spin_unlock(&zpci_domain_lock);
}
int zpci_enable_device(struct zpci_dev *zdev)
{
int rc;
rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
if (rc)
goto out;
pr_info("Enabled fh: 0x%x fid: 0x%x\n", zdev->fh, zdev->fid);
rc = zpci_dma_init_device(zdev);
if (rc)
goto out_dma;
return 0;
out_dma:
clp_disable_fh(zdev);
out:
return rc;
}
EXPORT_SYMBOL_GPL(zpci_enable_device);
int zpci_create_device(struct zpci_dev *zdev)
{
int rc;
rc = zpci_alloc_domain(zdev);
if (rc)
goto out;
rc = zpci_create_device_bus(zdev);
if (rc)
goto out_bus;
mutex_lock(&zpci_list_lock);
list_add_tail(&zdev->entry, &zpci_list);
if (hotplug_ops.create_slot)
hotplug_ops.create_slot(zdev);
mutex_unlock(&zpci_list_lock);
if (zdev->state == ZPCI_FN_STATE_STANDBY)
return 0;
rc = zpci_enable_device(zdev);
if (rc)
goto out_start;
return 0;
out_start:
mutex_lock(&zpci_list_lock);
list_del(&zdev->entry);
if (hotplug_ops.remove_slot)
hotplug_ops.remove_slot(zdev);
mutex_unlock(&zpci_list_lock);
out_bus:
zpci_free_domain(zdev);
out:
return rc;
}
void zpci_stop_device(struct zpci_dev *zdev)
{
zpci_dma_exit_device(zdev);
/*
* Note: SCLP disables fh via set-pci-fn so don't
* do that here.
*/
}
EXPORT_SYMBOL_GPL(zpci_stop_device);
int zpci_scan_device(struct zpci_dev *zdev)
{
zdev->pdev = pci_scan_single_device(zdev->bus, ZPCI_DEVFN);
if (!zdev->pdev) {
pr_err("pci_scan_single_device failed for fid: 0x%x\n",
zdev->fid);
goto out;
}
zpci_debug_init_device(zdev);
zpci_fmb_enable_device(zdev);
zpci_map_resources(zdev);
pci_bus_add_devices(zdev->bus);
/* now that pdev was added to the bus mark it as used */
zdev->state = ZPCI_FN_STATE_ONLINE;
return 0;
out:
zpci_dma_exit_device(zdev);
clp_disable_fh(zdev);
return -EIO;
}
EXPORT_SYMBOL_GPL(zpci_scan_device);
static inline int barsize(u8 size)
{
return (size) ? (1 << size) >> 10 : 0;
}
static int zpci_mem_init(void)
{
zdev_irq_cache = kmem_cache_create("PCI_IRQ_cache", sizeof(struct zdev_irq_map),
L1_CACHE_BYTES, SLAB_HWCACHE_ALIGN, NULL);
if (!zdev_irq_cache)
goto error_zdev;
zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
16, 0, NULL);
if (!zdev_fmb_cache)
goto error_fmb;
/* TODO: use realloc */
zpci_iomap_start = kzalloc(ZPCI_IOMAP_MAX_ENTRIES * sizeof(*zpci_iomap_start),
GFP_KERNEL);
if (!zpci_iomap_start)
goto error_iomap;
return 0;
error_iomap:
kmem_cache_destroy(zdev_fmb_cache);
error_fmb:
kmem_cache_destroy(zdev_irq_cache);
error_zdev:
return -ENOMEM;
}
static void zpci_mem_exit(void)
{
kfree(zpci_iomap_start);
kmem_cache_destroy(zdev_irq_cache);
kmem_cache_destroy(zdev_fmb_cache);
}
unsigned int pci_probe = 1;
EXPORT_SYMBOL_GPL(pci_probe);
char * __init pcibios_setup(char *str)
{
if (!strcmp(str, "off")) {
pci_probe = 0;
return NULL;
}
return str;
}
static int __init pci_base_init(void)
{
int rc;
if (!pci_probe)
return 0;
if (!test_facility(2) || !test_facility(69)
|| !test_facility(71) || !test_facility(72))
return 0;
pr_info("Probing PCI hardware: PCI:%d SID:%d AEN:%d\n",
test_facility(69), test_facility(70),
test_facility(71));
rc = zpci_debug_init();
if (rc)
return rc;
rc = zpci_mem_init();
if (rc)
goto out_mem;
rc = zpci_msihash_init();
if (rc)
goto out_hash;
rc = zpci_irq_init();
if (rc)
goto out_irq;
rc = zpci_dma_init();
if (rc)
goto out_dma;
rc = clp_find_pci_devices();
if (rc)
goto out_find;
zpci_scan_devices();
return 0;
out_find:
zpci_dma_exit();
out_dma:
zpci_irq_exit();
out_irq:
zpci_msihash_exit();
out_hash:
zpci_mem_exit();
out_mem:
zpci_debug_exit();
return rc;
}
subsys_initcall(pci_base_init);
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