| /* |
| * 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_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); |
| |
| |
| static void zpci_enable_irq(struct irq_data *data); |
| static void zpci_disable_irq(struct irq_data *data); |
| |
| static struct irq_chip zpci_irq_chip = { |
| .name = "zPCI", |
| .irq_unmask = zpci_enable_irq, |
| .irq_mask = zpci_disable_irq, |
| }; |
| |
| static struct pci_hp_callback_ops *hotplug_ops; |
| |
| static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES); |
| static DEFINE_SPINLOCK(zpci_domain_lock); |
| |
| static struct airq_iv *zpci_aisb_iv; |
| static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES]; |
| |
| /* Adapter interrupt definitions */ |
| static void zpci_irq_handler(struct airq_struct *airq); |
| |
| static struct airq_struct zpci_airq = { |
| .handler = zpci_irq_handler, |
| .isc = PCI_ISC, |
| }; |
| |
| /* 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); |
| |
| static struct kmem_cache *zdev_fmb_cache; |
| |
| 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_set_airq(struct zpci_dev *zdev) |
| { |
| 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->sum = 1; /* enable summary notifications */ |
| fib->noi = airq_iv_end(zdev->aibv); |
| fib->aibv = (unsigned long) zdev->aibv->vector; |
| fib->aibvo = 0; /* each zdev has its own interrupt vector */ |
| fib->aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8; |
| fib->aisbo = zdev->aisb & 63; |
| |
| rc = zpci_mod_fc(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 = zpci_mod_fc(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_clear_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_zalloc(zdev_fmb_cache, GFP_KERNEL); |
| if (!zdev->fmb) |
| return -ENOMEM; |
| 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 = zpci_load(&data, req, offset); |
| if (!rc) { |
| data = data << ((8 - len) * 8); |
| data = le64_to_cpu(data); |
| *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 = zpci_store(data, req, offset); |
| return rc; |
| } |
| |
| static int zpci_msi_set_mask_bits(struct msi_desc *msi, u32 mask, u32 flag) |
| { |
| int offset, pos; |
| u32 mask_bits; |
| |
| if (msi->msi_attrib.is_msix) { |
| offset = msi->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE + |
| PCI_MSIX_ENTRY_VECTOR_CTRL; |
| msi->masked = readl(msi->mask_base + offset); |
| writel(flag, msi->mask_base + offset); |
| } else if (msi->msi_attrib.maskbit) { |
| pos = (long) msi->mask_base; |
| pci_read_config_dword(msi->dev, pos, &mask_bits); |
| mask_bits &= ~(mask); |
| mask_bits |= flag & mask; |
| pci_write_config_dword(msi->dev, pos, mask_bits); |
| } else |
| return 0; |
| |
| msi->msi_attrib.maskbit = !!flag; |
| return 1; |
| } |
| |
| static void zpci_enable_irq(struct irq_data *data) |
| { |
| struct msi_desc *msi = irq_get_msi_desc(data->irq); |
| |
| zpci_msi_set_mask_bits(msi, 1, 0); |
| } |
| |
| static void zpci_disable_irq(struct irq_data *data) |
| { |
| struct msi_desc *msi = irq_get_msi_desc(data->irq); |
| |
| zpci_msi_set_mask_bits(msi, 1, 1); |
| } |
| |
| 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); |
| int ret; |
| |
| if (!zdev || devfn != ZPCI_DEVFN) |
| ret = -ENODEV; |
| else |
| ret = zpci_cfg_load(zdev, where, val, size); |
| |
| return ret; |
| } |
| |
| 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); |
| int ret; |
| |
| if (!zdev || devfn != ZPCI_DEVFN) |
| ret = -ENODEV; |
| else |
| ret = zpci_cfg_store(zdev, where, val, size); |
| |
| return ret; |
| } |
| |
| static struct pci_ops pci_root_ops = { |
| .read = pci_read, |
| .write = pci_write, |
| }; |
| |
| static void zpci_irq_handler(struct airq_struct *airq) |
| { |
| unsigned long si, ai; |
| struct airq_iv *aibv; |
| int irqs_on = 0; |
| |
| inc_irq_stat(IRQIO_PCI); |
| for (si = 0;;) { |
| /* Scan adapter summary indicator bit vector */ |
| si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv)); |
| if (si == -1UL) { |
| if (irqs_on++) |
| /* End of second scan with interrupts on. */ |
| break; |
| /* First scan complete, reenable interrupts. */ |
| zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC); |
| si = 0; |
| continue; |
| } |
| |
| /* Scan the adapter interrupt vector for this device. */ |
| aibv = zpci_aibv[si]; |
| for (ai = 0;;) { |
| ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv)); |
| if (ai == -1UL) |
| break; |
| inc_irq_stat(IRQIO_MSI); |
| airq_iv_lock(aibv, ai); |
| generic_handle_irq(airq_iv_get_data(aibv, ai)); |
| airq_iv_unlock(aibv, ai); |
| } |
| } |
| } |
| |
| int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) |
| { |
| struct zpci_dev *zdev = get_zdev(pdev); |
| unsigned int hwirq, irq, msi_vecs; |
| unsigned long aisb; |
| struct msi_desc *msi; |
| struct msi_msg msg; |
| int rc; |
| |
| pr_debug("%s: requesting %d MSI-X interrupts...", __func__, nvec); |
| if (type != PCI_CAP_ID_MSIX && type != PCI_CAP_ID_MSI) |
| return -EINVAL; |
| msi_vecs = min(nvec, ZPCI_MSI_VEC_MAX); |
| msi_vecs = min_t(unsigned int, msi_vecs, CONFIG_PCI_NR_MSI); |
| |
| /* Allocate adapter summary indicator bit */ |
| rc = -EIO; |
| aisb = airq_iv_alloc_bit(zpci_aisb_iv); |
| if (aisb == -1UL) |
| goto out; |
| zdev->aisb = aisb; |
| |
| /* Create adapter interrupt vector */ |
| rc = -ENOMEM; |
| zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK); |
| if (!zdev->aibv) |
| goto out_si; |
| |
| /* Wire up shortcut pointer */ |
| zpci_aibv[aisb] = zdev->aibv; |
| |
| /* Request MSI interrupts */ |
| hwirq = 0; |
| list_for_each_entry(msi, &pdev->msi_list, list) { |
| rc = -EIO; |
| irq = irq_alloc_desc(0); /* Alloc irq on node 0 */ |
| if (irq == NO_IRQ) |
| goto out_msi; |
| rc = irq_set_msi_desc(irq, msi); |
| if (rc) |
| goto out_msi; |
| irq_set_chip_and_handler(irq, &zpci_irq_chip, |
| handle_simple_irq); |
| msg.data = hwirq; |
| msg.address_lo = zdev->msi_addr & 0xffffffff; |
| msg.address_hi = zdev->msi_addr >> 32; |
| write_msi_msg(irq, &msg); |
| airq_iv_set_data(zdev->aibv, hwirq, irq); |
| hwirq++; |
| } |
| |
| /* Enable adapter interrupts */ |
| rc = zpci_set_airq(zdev); |
| if (rc) |
| goto out_msi; |
| |
| return (msi_vecs == nvec) ? 0 : msi_vecs; |
| |
| out_msi: |
| list_for_each_entry(msi, &pdev->msi_list, list) { |
| if (hwirq-- == 0) |
| break; |
| irq_set_msi_desc(msi->irq, NULL); |
| irq_free_desc(msi->irq); |
| msi->msg.address_lo = 0; |
| msi->msg.address_hi = 0; |
| msi->msg.data = 0; |
| msi->irq = 0; |
| } |
| zpci_aibv[aisb] = NULL; |
| airq_iv_release(zdev->aibv); |
| out_si: |
| airq_iv_free_bit(zpci_aisb_iv, aisb); |
| out: |
| dev_err(&pdev->dev, "register MSI failed with: %d\n", rc); |
| return rc; |
| } |
| |
| void arch_teardown_msi_irqs(struct pci_dev *pdev) |
| { |
| struct zpci_dev *zdev = get_zdev(pdev); |
| struct msi_desc *msi; |
| int rc; |
| |
| pr_info("%s: on pdev: %p\n", __func__, pdev); |
| |
| /* Disable adapter interrupts */ |
| rc = zpci_clear_airq(zdev); |
| if (rc) { |
| dev_err(&pdev->dev, "deregister MSI failed with: %d\n", rc); |
| return; |
| } |
| |
| /* Release MSI interrupts */ |
| list_for_each_entry(msi, &pdev->msi_list, list) { |
| zpci_msi_set_mask_bits(msi, 1, 1); |
| irq_set_msi_desc(msi->irq, NULL); |
| irq_free_desc(msi->irq); |
| msi->msg.address_lo = 0; |
| msi->msg.address_hi = 0; |
| msi->msg.data = 0; |
| msi->irq = 0; |
| } |
| |
| zpci_aibv[zdev->aisb] = NULL; |
| airq_iv_release(zdev->aibv); |
| airq_iv_free_bit(zpci_aisb_iv, zdev->aisb); |
| } |
| |
| 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 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; |
| 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); |
| return zdev ? : ERR_PTR(-ENOMEM); |
| } |
| |
| void zpci_free_device(struct zpci_dev *zdev) |
| { |
| kfree(zdev); |
| } |
| |
| /* |
| * 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; |
| } |
| |
| int pcibios_add_platform_entries(struct pci_dev *pdev) |
| { |
| return zpci_sysfs_add_device(&pdev->dev); |
| } |
| |
| static int __init zpci_irq_init(void) |
| { |
| int rc; |
| |
| rc = register_adapter_interrupt(&zpci_airq); |
| if (rc) |
| goto out; |
| /* Set summary to 1 to be called every time for the ISC. */ |
| *zpci_airq.lsi_ptr = 1; |
| |
| rc = -ENOMEM; |
| zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC); |
| if (!zpci_aisb_iv) |
| goto out_airq; |
| |
| zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC); |
| return 0; |
| |
| out_airq: |
| unregister_adapter_interrupt(&zpci_airq); |
| out: |
| return rc; |
| } |
| |
| static void zpci_irq_exit(void) |
| { |
| airq_iv_release(zpci_aisb_iv); |
| unregister_adapter_interrupt(&zpci_airq); |
| } |
| |
| 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); |
| } |
| |
| int pcibios_add_device(struct pci_dev *pdev) |
| { |
| struct zpci_dev *zdev = get_zdev(pdev); |
| |
| zdev->pdev = pdev; |
| zpci_debug_init_device(zdev); |
| zpci_fmb_enable_device(zdev); |
| zpci_map_resources(zdev); |
| |
| return 0; |
| } |
| |
| void pcibios_release_device(struct pci_dev *pdev) |
| { |
| struct zpci_dev *zdev = get_zdev(pdev); |
| |
| zpci_unmap_resources(zdev); |
| zpci_fmb_disable_device(zdev); |
| zpci_debug_exit_device(zdev); |
| zdev->pdev = NULL; |
| } |
| |
| static int zpci_scan_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_scan_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_disable_device(struct zpci_dev *zdev) |
| { |
| zpci_dma_exit_device(zdev); |
| return clp_disable_fh(zdev); |
| } |
| EXPORT_SYMBOL_GPL(zpci_disable_device); |
| |
| int zpci_create_device(struct zpci_dev *zdev) |
| { |
| int rc; |
| |
| rc = zpci_alloc_domain(zdev); |
| if (rc) |
| goto out; |
| |
| if (zdev->state == ZPCI_FN_STATE_CONFIGURED) { |
| rc = zpci_enable_device(zdev); |
| if (rc) |
| goto out_free; |
| |
| zdev->state = ZPCI_FN_STATE_ONLINE; |
| } |
| rc = zpci_scan_bus(zdev); |
| if (rc) |
| goto out_disable; |
| |
| mutex_lock(&zpci_list_lock); |
| list_add_tail(&zdev->entry, &zpci_list); |
| if (hotplug_ops) |
| hotplug_ops->create_slot(zdev); |
| mutex_unlock(&zpci_list_lock); |
| |
| return 0; |
| |
| out_disable: |
| if (zdev->state == ZPCI_FN_STATE_ONLINE) |
| zpci_disable_device(zdev); |
| out_free: |
| 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); |
| |
| static inline int barsize(u8 size) |
| { |
| return (size) ? (1 << size) >> 10 : 0; |
| } |
| |
| static int zpci_mem_init(void) |
| { |
| zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb), |
| 16, 0, NULL); |
| if (!zdev_fmb_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_fmb_cache); |
| error_zdev: |
| return -ENOMEM; |
| } |
| |
| static void zpci_mem_exit(void) |
| { |
| kfree(zpci_iomap_start); |
| kmem_cache_destroy(zdev_fmb_cache); |
| } |
| |
| void zpci_register_hp_ops(struct pci_hp_callback_ops *ops) |
| { |
| mutex_lock(&zpci_list_lock); |
| hotplug_ops = ops; |
| mutex_unlock(&zpci_list_lock); |
| } |
| EXPORT_SYMBOL_GPL(zpci_register_hp_ops); |
| |
| void zpci_deregister_hp_ops(void) |
| { |
| mutex_lock(&zpci_list_lock); |
| hotplug_ops = NULL; |
| mutex_unlock(&zpci_list_lock); |
| } |
| EXPORT_SYMBOL_GPL(zpci_deregister_hp_ops); |
| |
| unsigned int s390_pci_probe; |
| EXPORT_SYMBOL_GPL(s390_pci_probe); |
| |
| char * __init pcibios_setup(char *str) |
| { |
| if (!strcmp(str, "on")) { |
| s390_pci_probe = 1; |
| return NULL; |
| } |
| return str; |
| } |
| |
| static int __init pci_base_init(void) |
| { |
| int rc; |
| |
| if (!s390_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) |
| 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_find_pci_devices(); |
| if (rc) |
| goto out_find; |
| |
| 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(pci_base_init); |