53923354d6
Loading the pci hotplug module when no devices are present will fail
but unfortunately some hotplug callbacks stay registered to the pci
bus level. Fix this by not letting module loading fail when no pci
devices are present and provide proper {de}registration functions
for these callbacks.
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
205 lines
5.3 KiB
C
205 lines
5.3 KiB
C
#ifndef __ASM_S390_PCI_H
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#define __ASM_S390_PCI_H
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/* must be set before including asm-generic/pci.h */
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#define PCI_DMA_BUS_IS_PHYS (0)
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/* must be set before including pci_clp.h */
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#define PCI_BAR_COUNT 6
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#include <asm-generic/pci.h>
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#include <asm-generic/pci-dma-compat.h>
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#include <asm/pci_clp.h>
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#include <asm/pci_debug.h>
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#define PCIBIOS_MIN_IO 0x1000
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#define PCIBIOS_MIN_MEM 0x10000000
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#define pcibios_assign_all_busses() (0)
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void __iomem *pci_iomap(struct pci_dev *, int, unsigned long);
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void pci_iounmap(struct pci_dev *, void __iomem *);
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int pci_domain_nr(struct pci_bus *);
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int pci_proc_domain(struct pci_bus *);
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/* MSI arch hooks */
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#define arch_setup_msi_irqs arch_setup_msi_irqs
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#define arch_teardown_msi_irqs arch_teardown_msi_irqs
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#define ZPCI_BUS_NR 0 /* default bus number */
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#define ZPCI_DEVFN 0 /* default device number */
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/* PCI Function Controls */
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#define ZPCI_FC_FN_ENABLED 0x80
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#define ZPCI_FC_ERROR 0x40
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#define ZPCI_FC_BLOCKED 0x20
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#define ZPCI_FC_DMA_ENABLED 0x10
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struct zpci_fmb {
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u32 format : 8;
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u32 dma_valid : 1;
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u32 : 23;
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u32 samples;
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u64 last_update;
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/* hardware counters */
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u64 ld_ops;
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u64 st_ops;
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u64 stb_ops;
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u64 rpcit_ops;
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u64 dma_rbytes;
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u64 dma_wbytes;
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/* software counters */
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atomic64_t allocated_pages;
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atomic64_t mapped_pages;
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atomic64_t unmapped_pages;
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} __packed __aligned(16);
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struct msi_map {
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unsigned long irq;
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struct msi_desc *msi;
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struct hlist_node msi_chain;
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};
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#define ZPCI_NR_MSI_VECS 64
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#define ZPCI_MSI_MASK (ZPCI_NR_MSI_VECS - 1)
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enum zpci_state {
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ZPCI_FN_STATE_RESERVED,
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ZPCI_FN_STATE_STANDBY,
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ZPCI_FN_STATE_CONFIGURED,
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ZPCI_FN_STATE_ONLINE,
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NR_ZPCI_FN_STATES,
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};
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struct zpci_bar_struct {
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u32 val; /* bar start & 3 flag bits */
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u8 size; /* order 2 exponent */
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u16 map_idx; /* index into bar mapping array */
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};
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/* Private data per function */
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struct zpci_dev {
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struct pci_dev *pdev;
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struct pci_bus *bus;
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struct list_head entry; /* list of all zpci_devices, needed for hotplug, etc. */
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enum zpci_state state;
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u32 fid; /* function ID, used by sclp */
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u32 fh; /* function handle, used by insn's */
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u16 pchid; /* physical channel ID */
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u8 pfgid; /* function group ID */
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u16 domain;
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/* IRQ stuff */
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u64 msi_addr; /* MSI address */
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struct zdev_irq_map *irq_map;
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struct msi_map *msi_map[ZPCI_NR_MSI_VECS];
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unsigned int aisb; /* number of the summary bit */
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/* DMA stuff */
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unsigned long *dma_table;
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spinlock_t dma_table_lock;
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int tlb_refresh;
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spinlock_t iommu_bitmap_lock;
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unsigned long *iommu_bitmap;
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unsigned long iommu_size;
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unsigned long iommu_pages;
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unsigned int next_bit;
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struct zpci_bar_struct bars[PCI_BAR_COUNT];
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u64 start_dma; /* Start of available DMA addresses */
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u64 end_dma; /* End of available DMA addresses */
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u64 dma_mask; /* DMA address space mask */
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/* Function measurement block */
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struct zpci_fmb *fmb;
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u16 fmb_update; /* update interval */
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enum pci_bus_speed max_bus_speed;
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struct dentry *debugfs_dev;
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struct dentry *debugfs_perf;
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struct dentry *debugfs_debug;
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};
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struct pci_hp_callback_ops {
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int (*create_slot) (struct zpci_dev *zdev);
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void (*remove_slot) (struct zpci_dev *zdev);
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};
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static inline bool zdev_enabled(struct zpci_dev *zdev)
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{
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return (zdev->fh & (1UL << 31)) ? true : false;
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}
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/* -----------------------------------------------------------------------------
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Prototypes
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----------------------------------------------------------------------------- */
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/* Base stuff */
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struct zpci_dev *zpci_alloc_device(void);
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int zpci_create_device(struct zpci_dev *);
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int zpci_enable_device(struct zpci_dev *);
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void zpci_stop_device(struct zpci_dev *);
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void zpci_free_device(struct zpci_dev *);
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int zpci_scan_device(struct zpci_dev *);
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int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64);
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int zpci_unregister_ioat(struct zpci_dev *, u8);
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/* CLP */
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int clp_find_pci_devices(void);
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int clp_add_pci_device(u32, u32, int);
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int clp_enable_fh(struct zpci_dev *, u8);
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int clp_disable_fh(struct zpci_dev *);
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/* MSI */
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struct msi_desc *__irq_get_msi_desc(unsigned int);
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int zpci_msi_set_mask_bits(struct msi_desc *, u32, u32);
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int zpci_setup_msi_irq(struct zpci_dev *, struct msi_desc *, unsigned int, int);
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void zpci_teardown_msi_irq(struct zpci_dev *, struct msi_desc *);
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int zpci_msihash_init(void);
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void zpci_msihash_exit(void);
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#ifdef CONFIG_PCI
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/* Error handling and recovery */
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void zpci_event_error(void *);
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void zpci_event_availability(void *);
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#else /* CONFIG_PCI */
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static inline void zpci_event_error(void *e) {}
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static inline void zpci_event_availability(void *e) {}
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#endif /* CONFIG_PCI */
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/* Helpers */
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struct zpci_dev *get_zdev(struct pci_dev *);
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struct zpci_dev *get_zdev_by_fid(u32);
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bool zpci_fid_present(u32);
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/* sysfs */
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int zpci_sysfs_add_device(struct device *);
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void zpci_sysfs_remove_device(struct device *);
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/* DMA */
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int zpci_dma_init(void);
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void zpci_dma_exit(void);
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/* Hotplug */
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extern struct mutex zpci_list_lock;
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extern struct list_head zpci_list;
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extern unsigned int s390_pci_probe;
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void zpci_register_hp_ops(struct pci_hp_callback_ops *);
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void zpci_deregister_hp_ops(void);
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/* FMB */
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int zpci_fmb_enable_device(struct zpci_dev *);
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int zpci_fmb_disable_device(struct zpci_dev *);
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/* Debug */
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int zpci_debug_init(void);
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void zpci_debug_exit(void);
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void zpci_debug_init_device(struct zpci_dev *);
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void zpci_debug_exit_device(struct zpci_dev *);
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void zpci_debug_info(struct zpci_dev *, struct seq_file *);
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#endif
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