1 files changed, 326 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
new file mode 100644
index 000000000..108e732d7
--- /dev/null
+++ b/arch/s390/include/asm/pci.h
@@ -0,0 +1,326 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_S390_PCI_H
+#define __ASM_S390_PCI_H
+
+#include <linux/pci.h>
+#include <linux/mutex.h>
+#include <linux/iommu.h>
+#include <linux/pci_hotplug.h>
+#include <asm/pci_clp.h>
+#include <asm/pci_debug.h>
+#include <asm/pci_insn.h>
+#include <asm/sclp.h>
+
+#define PCIBIOS_MIN_IO		0x1000
+#define PCIBIOS_MIN_MEM		0x10000000
+
+#define pcibios_assign_all_busses()	(0)
+
+void __iomem *pci_iomap(struct pci_dev *, int, unsigned long);
+void pci_iounmap(struct pci_dev *, void __iomem *);
+int pci_domain_nr(struct pci_bus *);
+int pci_proc_domain(struct pci_bus *);
+
+#define ZPCI_BUS_NR			0	/* default bus number */
+
+#define ZPCI_NR_DMA_SPACES		1
+#define ZPCI_NR_DEVICES			CONFIG_PCI_NR_FUNCTIONS
+#define ZPCI_DOMAIN_BITMAP_SIZE		(1 << 16)
+
+#ifdef PCI
+#if (ZPCI_NR_DEVICES > ZPCI_DOMAIN_BITMAP_SIZE)
+# error ZPCI_NR_DEVICES can not be bigger than ZPCI_DOMAIN_BITMAP_SIZE
+#endif
+#endif /* PCI */
+
+/* PCI Function Controls */
+#define ZPCI_FC_FN_ENABLED		0x80
+#define ZPCI_FC_ERROR			0x40
+#define ZPCI_FC_BLOCKED			0x20
+#define ZPCI_FC_DMA_ENABLED		0x10
+
+#define ZPCI_FMB_DMA_COUNTER_VALID	(1 << 23)
+
+struct zpci_fmb_fmt0 {
+	u64 dma_rbytes;
+	u64 dma_wbytes;
+};
+
+struct zpci_fmb_fmt1 {
+	u64 rx_bytes;
+	u64 rx_packets;
+	u64 tx_bytes;
+	u64 tx_packets;
+};
+
+struct zpci_fmb_fmt2 {
+	u64 consumed_work_units;
+	u64 max_work_units;
+};
+
+struct zpci_fmb_fmt3 {
+	u64 tx_bytes;
+};
+
+struct zpci_fmb {
+	u32 format	: 8;
+	u32 fmt_ind	: 24;
+	u32 samples;
+	u64 last_update;
+	/* common counters */
+	u64 ld_ops;
+	u64 st_ops;
+	u64 stb_ops;
+	u64 rpcit_ops;
+	/* format specific counters */
+	union {
+		struct zpci_fmb_fmt0 fmt0;
+		struct zpci_fmb_fmt1 fmt1;
+		struct zpci_fmb_fmt2 fmt2;
+		struct zpci_fmb_fmt3 fmt3;
+	};
+} __packed __aligned(128);
+
+enum zpci_state {
+	ZPCI_FN_STATE_STANDBY = 0,
+	ZPCI_FN_STATE_CONFIGURED = 1,
+	ZPCI_FN_STATE_RESERVED = 2,
+};
+
+struct zpci_bar_struct {
+	struct resource *res;		/* bus resource */
+	void __iomem	*mio_wb;
+	void __iomem	*mio_wt;
+	u32		val;		/* bar start & 3 flag bits */
+	u16		map_idx;	/* index into bar mapping array */
+	u8		size;		/* order 2 exponent */
+};
+
+struct s390_domain;
+struct kvm_zdev;
+
+#define ZPCI_FUNCTIONS_PER_BUS 256
+struct zpci_bus {
+	struct kref		kref;
+	struct pci_bus		*bus;
+	struct zpci_dev		*function[ZPCI_FUNCTIONS_PER_BUS];
+	struct list_head	resources;
+	struct list_head	bus_next;
+	struct resource		bus_resource;
+	int			pchid;
+	int			domain_nr;
+	bool			multifunction;
+	enum pci_bus_speed	max_bus_speed;
+};
+
+/* Private data per function */
+struct zpci_dev {
+	struct zpci_bus *zbus;
+	struct list_head entry;		/* list of all zpci_devices, needed for hotplug, etc. */
+	struct kref kref;
+	struct hotplug_slot hotplug_slot;
+
+	enum zpci_state state;
+	u32		fid;		/* function ID, used by sclp */
+	u32		fh;		/* function handle, used by insn's */
+	u32		gisa;		/* GISA designation for passthrough */
+	u16		vfn;		/* virtual function number */
+	u16		pchid;		/* physical channel ID */
+	u16		maxstbl;	/* Maximum store block size */
+	u8		pfgid;		/* function group ID */
+	u8		pft;		/* pci function type */
+	u8		port;
+	u8		dtsm;		/* Supported DT mask */
+	u8		rid_available	: 1;
+	u8		has_hp_slot	: 1;
+	u8		has_resources	: 1;
+	u8		is_physfn	: 1;
+	u8		util_str_avail	: 1;
+	u8		irqs_registered	: 1;
+	u8		reserved	: 2;
+	unsigned int	devfn;		/* DEVFN part of the RID*/
+
+	struct mutex lock;
+	u8 pfip[CLP_PFIP_NR_SEGMENTS];	/* pci function internal path */
+	u32 uid;			/* user defined id */
+	u8 util_str[CLP_UTIL_STR_LEN];	/* utility string */
+
+	/* IRQ stuff */
+	u64		msi_addr;	/* MSI address */
+	unsigned int	max_msi;	/* maximum number of MSI's */
+	unsigned int	msi_first_bit;
+	unsigned int	msi_nr_irqs;
+	struct airq_iv *aibv;		/* adapter interrupt bit vector */
+	unsigned long	aisb;		/* number of the summary bit */
+
+	/* DMA stuff */
+	unsigned long	*dma_table;
+	spinlock_t	dma_table_lock;
+	int		tlb_refresh;
+
+	spinlock_t	iommu_bitmap_lock;
+	unsigned long	*iommu_bitmap;
+	unsigned long	*lazy_bitmap;
+	unsigned long	iommu_size;
+	unsigned long	iommu_pages;
+	unsigned int	next_bit;
+
+	struct iommu_device iommu_dev;  /* IOMMU core handle */
+
+	char res_name[16];
+	bool mio_capable;
+	struct zpci_bar_struct bars[PCI_STD_NUM_BARS];
+
+	u64		start_dma;	/* Start of available DMA addresses */
+	u64		end_dma;	/* End of available DMA addresses */
+	u64		dma_mask;	/* DMA address space mask */
+
+	/* Function measurement block */
+	struct zpci_fmb *fmb;
+	u16		fmb_update;	/* update interval */
+	u16		fmb_length;
+	/* software counters */
+	atomic64_t allocated_pages;
+	atomic64_t mapped_pages;
+	atomic64_t unmapped_pages;
+
+	u8		version;
+	enum pci_bus_speed max_bus_speed;
+
+	struct dentry	*debugfs_dev;
+
+	/* IOMMU and passthrough */
+	struct s390_domain *s390_domain; /* s390 IOMMU domain data */
+	struct kvm_zdev *kzdev;
+	struct mutex kzdev_lock;
+};
+
+static inline bool zdev_enabled(struct zpci_dev *zdev)
+{
+	return (zdev->fh & (1UL << 31)) ? true : false;
+}
+
+extern const struct attribute_group *zpci_attr_groups[];
+extern unsigned int s390_pci_force_floating __initdata;
+extern unsigned int s390_pci_no_rid;
+
+extern union zpci_sic_iib *zpci_aipb;
+extern struct airq_iv *zpci_aif_sbv;
+
+/* -----------------------------------------------------------------------------
+  Prototypes
+----------------------------------------------------------------------------- */
+/* Base stuff */
+struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state);
+int zpci_enable_device(struct zpci_dev *);
+int zpci_disable_device(struct zpci_dev *);
+int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh);
+int zpci_deconfigure_device(struct zpci_dev *zdev);
+void zpci_device_reserved(struct zpci_dev *zdev);
+bool zpci_is_device_configured(struct zpci_dev *zdev);
+
+int zpci_hot_reset_device(struct zpci_dev *zdev);
+int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64);
+int zpci_unregister_ioat(struct zpci_dev *, u8);
+void zpci_remove_reserved_devices(void);
+void zpci_update_fh(struct zpci_dev *zdev, u32 fh);
+
+/* CLP */
+int clp_setup_writeback_mio(void);
+int clp_scan_pci_devices(void);
+int clp_query_pci_fn(struct zpci_dev *zdev);
+int clp_enable_fh(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as);
+int clp_disable_fh(struct zpci_dev *zdev, u32 *fh);
+int clp_get_state(u32 fid, enum zpci_state *state);
+int clp_refresh_fh(u32 fid, u32 *fh);
+
+/* UID */
+void update_uid_checking(bool new);
+
+/* IOMMU Interface */
+int zpci_init_iommu(struct zpci_dev *zdev);
+void zpci_destroy_iommu(struct zpci_dev *zdev);
+
+#ifdef CONFIG_PCI
+static inline bool zpci_use_mio(struct zpci_dev *zdev)
+{
+	return static_branch_likely(&have_mio) && zdev->mio_capable;
+}
+
+/* Error handling and recovery */
+void zpci_event_error(void *);
+void zpci_event_availability(void *);
+bool zpci_is_enabled(void);
+#else /* CONFIG_PCI */
+static inline void zpci_event_error(void *e) {}
+static inline void zpci_event_availability(void *e) {}
+#endif /* CONFIG_PCI */
+
+#ifdef CONFIG_HOTPLUG_PCI_S390
+int zpci_init_slot(struct zpci_dev *);
+void zpci_exit_slot(struct zpci_dev *);
+#else /* CONFIG_HOTPLUG_PCI_S390 */
+static inline int zpci_init_slot(struct zpci_dev *zdev)
+{
+	return 0;
+}
+static inline void zpci_exit_slot(struct zpci_dev *zdev) {}
+#endif /* CONFIG_HOTPLUG_PCI_S390 */
+
+/* Helpers */
+static inline struct zpci_dev *to_zpci(struct pci_dev *pdev)
+{
+	struct zpci_bus *zbus = pdev->sysdata;
+
+	return zbus->function[pdev->devfn];
+}
+
+static inline struct zpci_dev *to_zpci_dev(struct device *dev)
+{
+	return to_zpci(to_pci_dev(dev));
+}
+
+struct zpci_dev *get_zdev_by_fid(u32);
+
+/* DMA */
+int zpci_dma_init(void);
+void zpci_dma_exit(void);
+int zpci_dma_init_device(struct zpci_dev *zdev);
+int zpci_dma_exit_device(struct zpci_dev *zdev);
+
+/* IRQ */
+int __init zpci_irq_init(void);
+void __init zpci_irq_exit(void);
+
+/* FMB */
+int zpci_fmb_enable_device(struct zpci_dev *);
+int zpci_fmb_disable_device(struct zpci_dev *);
+
+/* Debug */
+int zpci_debug_init(void);
+void zpci_debug_exit(void);
+void zpci_debug_init_device(struct zpci_dev *, const char *);
+void zpci_debug_exit_device(struct zpci_dev *);
+
+/* Error handling */
+int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *);
+int zpci_clear_error_state(struct zpci_dev *zdev);
+int zpci_reset_load_store_blocked(struct zpci_dev *zdev);
+
+#ifdef CONFIG_NUMA
+
+/* Returns the node based on PCI bus */
+static inline int __pcibus_to_node(const struct pci_bus *bus)
+{
+	return NUMA_NO_NODE;
+}
+
+static inline const struct cpumask *
+cpumask_of_pcibus(const struct pci_bus *bus)
+{
+	return cpu_online_mask;
+}
+
+#endif /* CONFIG_NUMA */
+
+#endif