mirror of https://gitee.com/openkylin/linux.git
1142 lines
25 KiB
C
1142 lines
25 KiB
C
/*
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* Copyright IBM Corp. 2012
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*
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* Author(s):
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* Jan Glauber <jang@linux.vnet.ibm.com>
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*
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* The System z PCI code is a rewrite from a prototype by
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* the following people (Kudoz!):
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* Alexander Schmidt
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* Christoph Raisch
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* Hannes Hering
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* Hoang-Nam Nguyen
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* Jan-Bernd Themann
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* Stefan Roscher
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* Thomas Klein
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*/
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#define COMPONENT "zPCI"
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#define pr_fmt(fmt) COMPONENT ": " fmt
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/kernel_stat.h>
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#include <linux/seq_file.h>
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#include <linux/pci.h>
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#include <linux/msi.h>
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#include <asm/isc.h>
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#include <asm/airq.h>
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#include <asm/facility.h>
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#include <asm/pci_insn.h>
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#include <asm/pci_clp.h>
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#include <asm/pci_dma.h>
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#define DEBUG /* enable pr_debug */
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#define SIC_IRQ_MODE_ALL 0
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#define SIC_IRQ_MODE_SINGLE 1
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#define ZPCI_NR_DMA_SPACES 1
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#define ZPCI_MSI_VEC_BITS 6
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#define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS
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/* list of all detected zpci devices */
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LIST_HEAD(zpci_list);
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EXPORT_SYMBOL_GPL(zpci_list);
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DEFINE_MUTEX(zpci_list_lock);
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EXPORT_SYMBOL_GPL(zpci_list_lock);
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struct pci_hp_callback_ops hotplug_ops;
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EXPORT_SYMBOL_GPL(hotplug_ops);
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static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
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static DEFINE_SPINLOCK(zpci_domain_lock);
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struct callback {
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irq_handler_t handler;
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void *data;
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};
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struct zdev_irq_map {
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unsigned long aibv; /* AI bit vector */
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int msi_vecs; /* consecutive MSI-vectors used */
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int __unused;
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struct callback cb[ZPCI_NR_MSI_VECS]; /* callback handler array */
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spinlock_t lock; /* protect callbacks against de-reg */
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};
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struct intr_bucket {
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/* amap of adapters, one bit per dev, corresponds to one irq nr */
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unsigned long *alloc;
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/* AI summary bit, global page for all devices */
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unsigned long *aisb;
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/* pointer to aibv and callback data in zdev */
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struct zdev_irq_map *imap[ZPCI_NR_DEVICES];
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/* protects the whole bucket struct */
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spinlock_t lock;
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};
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static struct intr_bucket *bucket;
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/* Adapter local summary indicator */
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static u8 *zpci_irq_si;
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static atomic_t irq_retries = ATOMIC_INIT(0);
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/* I/O Map */
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static DEFINE_SPINLOCK(zpci_iomap_lock);
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static DECLARE_BITMAP(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
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struct zpci_iomap_entry *zpci_iomap_start;
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EXPORT_SYMBOL_GPL(zpci_iomap_start);
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/* highest irq summary bit */
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static int __read_mostly aisb_max;
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static struct kmem_cache *zdev_irq_cache;
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static struct kmem_cache *zdev_fmb_cache;
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debug_info_t *pci_debug_msg_id;
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debug_info_t *pci_debug_err_id;
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static inline int irq_to_msi_nr(unsigned int irq)
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{
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return irq & ZPCI_MSI_MASK;
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}
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static inline int irq_to_dev_nr(unsigned int irq)
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{
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return irq >> ZPCI_MSI_VEC_BITS;
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}
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static inline struct zdev_irq_map *get_imap(unsigned int irq)
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{
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return bucket->imap[irq_to_dev_nr(irq)];
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}
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struct zpci_dev *get_zdev(struct pci_dev *pdev)
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{
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return (struct zpci_dev *) pdev->sysdata;
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}
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struct zpci_dev *get_zdev_by_fid(u32 fid)
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{
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struct zpci_dev *tmp, *zdev = NULL;
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mutex_lock(&zpci_list_lock);
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list_for_each_entry(tmp, &zpci_list, entry) {
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if (tmp->fid == fid) {
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zdev = tmp;
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break;
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}
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}
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mutex_unlock(&zpci_list_lock);
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return zdev;
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}
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bool zpci_fid_present(u32 fid)
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{
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return (get_zdev_by_fid(fid) != NULL) ? true : false;
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}
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static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
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{
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return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
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}
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int pci_domain_nr(struct pci_bus *bus)
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{
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return ((struct zpci_dev *) bus->sysdata)->domain;
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}
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EXPORT_SYMBOL_GPL(pci_domain_nr);
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int pci_proc_domain(struct pci_bus *bus)
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{
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return pci_domain_nr(bus);
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}
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EXPORT_SYMBOL_GPL(pci_proc_domain);
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/* Modify PCI: Register adapter interruptions */
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static int zpci_register_airq(struct zpci_dev *zdev, unsigned int aisb,
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u64 aibv)
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{
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u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
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struct zpci_fib *fib;
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int rc;
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fib = (void *) get_zeroed_page(GFP_KERNEL);
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if (!fib)
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return -ENOMEM;
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fib->isc = PCI_ISC;
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fib->noi = zdev->irq_map->msi_vecs;
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fib->sum = 1; /* enable summary notifications */
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fib->aibv = aibv;
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fib->aibvo = 0; /* every function has its own page */
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fib->aisb = (u64) bucket->aisb + aisb / 8;
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fib->aisbo = aisb & ZPCI_MSI_MASK;
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rc = mpcifc_instr(req, fib);
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pr_debug("%s mpcifc returned noi: %d\n", __func__, fib->noi);
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free_page((unsigned long) fib);
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return rc;
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}
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struct mod_pci_args {
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u64 base;
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u64 limit;
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u64 iota;
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u64 fmb_addr;
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};
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static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args)
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{
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u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn);
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struct zpci_fib *fib;
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int rc;
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/* The FIB must be available even if it's not used */
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fib = (void *) get_zeroed_page(GFP_KERNEL);
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if (!fib)
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return -ENOMEM;
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fib->pba = args->base;
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fib->pal = args->limit;
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fib->iota = args->iota;
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fib->fmb_addr = args->fmb_addr;
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rc = mpcifc_instr(req, fib);
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free_page((unsigned long) fib);
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return rc;
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}
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/* Modify PCI: Register I/O address translation parameters */
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int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
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u64 base, u64 limit, u64 iota)
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{
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struct mod_pci_args args = { base, limit, iota, 0 };
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WARN_ON_ONCE(iota & 0x3fff);
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args.iota |= ZPCI_IOTA_RTTO_FLAG;
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return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args);
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}
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/* Modify PCI: Unregister I/O address translation parameters */
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int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
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{
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struct mod_pci_args args = { 0, 0, 0, 0 };
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return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args);
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}
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/* Modify PCI: Unregister adapter interruptions */
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static int zpci_unregister_airq(struct zpci_dev *zdev)
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{
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struct mod_pci_args args = { 0, 0, 0, 0 };
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return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args);
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}
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/* Modify PCI: Set PCI function measurement parameters */
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int zpci_fmb_enable_device(struct zpci_dev *zdev)
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{
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struct mod_pci_args args = { 0, 0, 0, 0 };
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if (zdev->fmb)
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return -EINVAL;
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zdev->fmb = kmem_cache_alloc(zdev_fmb_cache, GFP_KERNEL);
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if (!zdev->fmb)
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return -ENOMEM;
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memset(zdev->fmb, 0, sizeof(*zdev->fmb));
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WARN_ON((u64) zdev->fmb & 0xf);
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args.fmb_addr = virt_to_phys(zdev->fmb);
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return mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
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}
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/* Modify PCI: Disable PCI function measurement */
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int zpci_fmb_disable_device(struct zpci_dev *zdev)
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{
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struct mod_pci_args args = { 0, 0, 0, 0 };
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int rc;
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if (!zdev->fmb)
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return -EINVAL;
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/* Function measurement is disabled if fmb address is zero */
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rc = mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
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kmem_cache_free(zdev_fmb_cache, zdev->fmb);
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zdev->fmb = NULL;
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return rc;
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}
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#define ZPCI_PCIAS_CFGSPC 15
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static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
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{
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u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
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u64 data;
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int rc;
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rc = pcilg_instr(&data, req, offset);
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data = data << ((8 - len) * 8);
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data = le64_to_cpu(data);
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if (!rc)
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*val = (u32) data;
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else
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*val = 0xffffffff;
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return rc;
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}
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static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
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{
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u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
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u64 data = val;
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int rc;
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data = cpu_to_le64(data);
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data = data >> ((8 - len) * 8);
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rc = pcistg_instr(data, req, offset);
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return rc;
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}
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void synchronize_irq(unsigned int irq)
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{
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/*
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* Not needed, the handler is protected by a lock and IRQs that occur
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* after the handler is deleted are just NOPs.
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*/
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}
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EXPORT_SYMBOL_GPL(synchronize_irq);
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void enable_irq(unsigned int irq)
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{
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struct msi_desc *msi = irq_get_msi_desc(irq);
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zpci_msi_set_mask_bits(msi, 1, 0);
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}
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EXPORT_SYMBOL_GPL(enable_irq);
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void disable_irq(unsigned int irq)
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{
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struct msi_desc *msi = irq_get_msi_desc(irq);
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zpci_msi_set_mask_bits(msi, 1, 1);
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}
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EXPORT_SYMBOL_GPL(disable_irq);
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void disable_irq_nosync(unsigned int irq)
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{
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disable_irq(irq);
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}
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EXPORT_SYMBOL_GPL(disable_irq_nosync);
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unsigned long probe_irq_on(void)
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{
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return 0;
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}
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EXPORT_SYMBOL_GPL(probe_irq_on);
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int probe_irq_off(unsigned long val)
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{
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return 0;
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}
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EXPORT_SYMBOL_GPL(probe_irq_off);
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unsigned int probe_irq_mask(unsigned long val)
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{
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return val;
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}
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EXPORT_SYMBOL_GPL(probe_irq_mask);
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void pcibios_fixup_bus(struct pci_bus *bus)
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{
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}
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resource_size_t pcibios_align_resource(void *data, const struct resource *res,
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resource_size_t size,
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resource_size_t align)
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{
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return 0;
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}
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/* combine single writes by using store-block insn */
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void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
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{
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zpci_memcpy_toio(to, from, count);
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}
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/* Create a virtual mapping cookie for a PCI BAR */
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void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max)
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{
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struct zpci_dev *zdev = get_zdev(pdev);
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u64 addr;
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int idx;
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if ((bar & 7) != bar)
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return NULL;
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idx = zdev->bars[bar].map_idx;
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spin_lock(&zpci_iomap_lock);
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zpci_iomap_start[idx].fh = zdev->fh;
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zpci_iomap_start[idx].bar = bar;
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spin_unlock(&zpci_iomap_lock);
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addr = ZPCI_IOMAP_ADDR_BASE | ((u64) idx << 48);
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return (void __iomem *) addr;
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}
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EXPORT_SYMBOL_GPL(pci_iomap);
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void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
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{
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unsigned int idx;
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idx = (((__force u64) addr) & ~ZPCI_IOMAP_ADDR_BASE) >> 48;
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spin_lock(&zpci_iomap_lock);
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zpci_iomap_start[idx].fh = 0;
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zpci_iomap_start[idx].bar = 0;
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spin_unlock(&zpci_iomap_lock);
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}
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EXPORT_SYMBOL_GPL(pci_iounmap);
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static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
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int size, u32 *val)
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{
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struct zpci_dev *zdev = get_zdev_by_bus(bus);
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if (!zdev || devfn != ZPCI_DEVFN)
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return 0;
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return zpci_cfg_load(zdev, where, val, size);
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}
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static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
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int size, u32 val)
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{
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struct zpci_dev *zdev = get_zdev_by_bus(bus);
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if (!zdev || devfn != ZPCI_DEVFN)
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return 0;
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return zpci_cfg_store(zdev, where, val, size);
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}
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static struct pci_ops pci_root_ops = {
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.read = pci_read,
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.write = pci_write,
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};
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/* store the last handled bit to implement fair scheduling of devices */
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static DEFINE_PER_CPU(unsigned long, next_sbit);
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static void zpci_irq_handler(void *dont, void *need)
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{
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unsigned long sbit, mbit, last = 0, start = __get_cpu_var(next_sbit);
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int rescan = 0, max = aisb_max;
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struct zdev_irq_map *imap;
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inc_irq_stat(IRQIO_PCI);
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sbit = start;
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scan:
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/* find summary_bit */
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for_each_set_bit_left_cont(sbit, bucket->aisb, max) {
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clear_bit(63 - (sbit & 63), bucket->aisb + (sbit >> 6));
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last = sbit;
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/* find vector bit */
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imap = bucket->imap[sbit];
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for_each_set_bit_left(mbit, &imap->aibv, imap->msi_vecs) {
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inc_irq_stat(IRQIO_MSI);
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clear_bit(63 - mbit, &imap->aibv);
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spin_lock(&imap->lock);
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if (imap->cb[mbit].handler)
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imap->cb[mbit].handler(mbit,
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imap->cb[mbit].data);
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spin_unlock(&imap->lock);
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}
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}
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if (rescan)
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goto out;
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/* scan the skipped bits */
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if (start > 0) {
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sbit = 0;
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max = start;
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start = 0;
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goto scan;
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}
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/* enable interrupts again */
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sic_instr(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
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/* check again to not lose initiative */
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rmb();
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max = aisb_max;
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sbit = find_first_bit_left(bucket->aisb, max);
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if (sbit != max) {
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atomic_inc(&irq_retries);
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rescan++;
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goto scan;
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}
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out:
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/* store next device bit to scan */
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__get_cpu_var(next_sbit) = (++last >= aisb_max) ? 0 : last;
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}
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/* msi_vecs - number of requested interrupts, 0 place function to error state */
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static int zpci_setup_msi(struct pci_dev *pdev, int msi_vecs)
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{
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struct zpci_dev *zdev = get_zdev(pdev);
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unsigned int aisb, msi_nr;
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struct msi_desc *msi;
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int rc;
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/* store the number of used MSI vectors */
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zdev->irq_map->msi_vecs = min(msi_vecs, ZPCI_NR_MSI_VECS);
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spin_lock(&bucket->lock);
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aisb = find_first_zero_bit(bucket->alloc, PAGE_SIZE);
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/* alloc map exhausted? */
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if (aisb == PAGE_SIZE) {
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spin_unlock(&bucket->lock);
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return -EIO;
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}
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set_bit(aisb, bucket->alloc);
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spin_unlock(&bucket->lock);
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zdev->aisb = aisb;
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if (aisb + 1 > aisb_max)
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|
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);
|