| /* |
| * 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 <alexschm@de.ibm.com> |
| * Christoph Raisch <raisch@de.ibm.com> |
| * Hannes Hering <hering2@de.ibm.com> |
| * Hoang-Nam Nguyen <hnguyen@de.ibm.com> |
| * Jan-Bernd Themann <themann@de.ibm.com> |
| * Stefan Roscher <stefan.roscher@de.ibm.com> |
| * Thomas Klein <tklein@de.ibm.com> |
| */ |
| |
| #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 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); |
| |
| /* Store PCI function information block */ |
| static int zpci_store_fib(struct zpci_dev *zdev, u8 *fc) |
| { |
| struct zpci_fib *fib; |
| u8 status, cc; |
| |
| fib = (void *) get_zeroed_page(GFP_KERNEL); |
| if (!fib) |
| return -ENOMEM; |
| |
| do { |
| cc = __stpcifc(zdev->fh, 0, fib, &status); |
| if (cc == 2) { |
| msleep(ZPCI_INSN_BUSY_DELAY); |
| memset(fib, 0, PAGE_SIZE); |
| } |
| } while (cc == 2); |
| |
| if (cc) |
| pr_err_once("%s: cc: %u status: %u\n", |
| __func__, cc, status); |
| |
| /* Return PCI function controls */ |
| *fc = fib->fc; |
| |
| free_page((unsigned long) fib); |
| return (cc) ? -EIO : 0; |
| } |
| |
| /* 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; |
| }; |
| |
| 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; |
| |
| 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 }; |
| |
| 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 }; |
| |
| 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 }; |
| |
| return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args); |
| } |
| |
| #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 __devinit 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; |
| } |
| |
| /* 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; |
| |
| kstat_cpu(smp_processor_id()).irqs[IOINT_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) { |
| kstat_cpu(smp_processor_id()).irqs[IOINT_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_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); |
| } |
| |
| 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_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; |
| |
| /* 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_irq_cache); |
| error_zdev: |
| return -ENOMEM; |
| } |
| |
| static void zpci_mem_exit(void) |
| { |
| kfree(zpci_iomap_start); |
| kmem_cache_destroy(zdev_irq_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_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: |
| return rc; |
| } |
| subsys_initcall(pci_base_init); |