pci.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef __ASM_S390_PCI_H
  3#define __ASM_S390_PCI_H
  4
  5#include <linux/pci.h>
  6#include <linux/mutex.h>
  7#include <linux/iommu.h>
  8#include <linux/irqdomain.h>
  9#include <linux/pci_hotplug.h>
 10#include <asm/pci_clp.h>
 11#include <asm/pci_debug.h>
 12#include <asm/pci_insn.h>
 13#include <asm/sclp.h>
 14
 15#define ARCH_GENERIC_PCI_MMAP_RESOURCE	1
 16#define arch_can_pci_mmap_wc()		1
 17
 18#define PCIBIOS_MIN_IO		0x1000
 19#define PCIBIOS_MIN_MEM		0x10000000
 20
 21#define pcibios_assign_all_busses()	(0)
 22
 23void __iomem *pci_iomap(struct pci_dev *, int, unsigned long);
 24void pci_iounmap(struct pci_dev *, void __iomem *);
 25int pci_domain_nr(struct pci_bus *);
 26int pci_proc_domain(struct pci_bus *);
 27
 28#define ZPCI_BUS_NR			0	/* default bus number */
 29
 30#define ZPCI_NR_DMA_SPACES		1
 31#define ZPCI_NR_DEVICES			CONFIG_PCI_NR_FUNCTIONS
 32#define ZPCI_DOMAIN_BITMAP_SIZE		(1 << 16)
 33
 34#ifdef PCI
 35#if (ZPCI_NR_DEVICES > ZPCI_DOMAIN_BITMAP_SIZE)
 36# error ZPCI_NR_DEVICES can not be bigger than ZPCI_DOMAIN_BITMAP_SIZE
 37#endif
 38#endif /* PCI */
 39
 40/* PCI Function Controls */
 41#define ZPCI_FC_FN_ENABLED		0x80
 42#define ZPCI_FC_ERROR			0x40
 43#define ZPCI_FC_BLOCKED			0x20
 44#define ZPCI_FC_DMA_ENABLED		0x10
 45
 46#define ZPCI_FMB_DMA_COUNTER_VALID	(1 << 23)
 47
 48struct zpci_fmb_fmt0 {
 49	u64 dma_rbytes;
 50	u64 dma_wbytes;
 51};
 52
 53struct zpci_fmb_fmt1 {
 54	u64 rx_bytes;
 55	u64 rx_packets;
 56	u64 tx_bytes;
 57	u64 tx_packets;
 58};
 59
 60struct zpci_fmb_fmt2 {
 61	u64 consumed_work_units;
 62	u64 max_work_units;
 63};
 64
 65struct zpci_fmb_fmt3 {
 66	u64 tx_bytes;
 67};
 68
 69struct zpci_fmb {
 70	u32 format	: 8;
 71	u32 fmt_ind	: 24;
 72	u32 samples;
 73	u64 last_update;
 74	/* common counters */
 75	u64 ld_ops;
 76	u64 st_ops;
 77	u64 stb_ops;
 78	u64 rpcit_ops;
 79	/* format specific counters */
 80	union {
 81		struct zpci_fmb_fmt0 fmt0;
 82		struct zpci_fmb_fmt1 fmt1;
 83		struct zpci_fmb_fmt2 fmt2;
 84		struct zpci_fmb_fmt3 fmt3;
 85	};
 86} __packed __aligned(128);
 87
 88enum zpci_state {
 89	ZPCI_FN_STATE_STANDBY = 0,
 90	ZPCI_FN_STATE_CONFIGURED = 1,
 91	ZPCI_FN_STATE_RESERVED = 2,
 92};
 93
 94struct zpci_bar_struct {
 95	struct resource *res;		/* bus resource */
 96	void __iomem	*mio_wb;
 97	void __iomem	*mio_wt;
 98	u32		val;		/* bar start & 3 flag bits */
 99	u16		map_idx;	/* index into bar mapping array */
100	u8		size;		/* order 2 exponent */
101};
102
103struct kvm_zdev;
104
105#define ZPCI_FUNCTIONS_PER_BUS 256
106struct zpci_bus {
107	struct kref		kref;
108	struct pci_bus		*bus;
109	struct zpci_dev		*function[ZPCI_FUNCTIONS_PER_BUS];
110	struct list_head	resources;
111	struct list_head	bus_next;
112	struct resource		bus_resource;
113	struct irq_domain	*msi_parent_domain;
114	int			topo;		/* TID if topo_is_tid, PCHID otherwise */
115	int			domain_nr;
116	u8			multifunction	: 1;
117	u8			topo_is_tid	: 1;
118	enum pci_bus_speed	max_bus_speed;
119};
120
121/* Private data per function */
122struct zpci_dev {
123	struct zpci_bus *zbus;
124	struct list_head entry;		/* list of all zpci_devices, needed for hotplug, etc. */
125	struct list_head iommu_list;
126	struct kref kref;
127	struct rcu_head rcu;
128	struct hotplug_slot hotplug_slot;
129
130	struct mutex state_lock;	/* protect state changes */
131	enum zpci_state state;
132	u32		fid;		/* function ID, used by sclp */
133	u32		fh;		/* function handle, used by insn's */
134	u32		gisa;		/* GISA designation for passthrough */
135	u16		vfn;		/* virtual function number */
136	u16		pchid;		/* physical channel ID */
137	u16		maxstbl;	/* Maximum store block size */
138	u16		rid;		/* RID as supplied by firmware */
139	u16		tid;		/* Topology for which RID is valid */
140	u8		pfgid;		/* function group ID */
141	u8		pft;		/* pci function type */
142	u8		port;
143	u8		fidparm;
144	u8		dtsm;		/* Supported DT mask */
145	u8		rid_available	: 1;
146	u8		has_hp_slot	: 1;
147	u8		has_resources	: 1;
148	u8		is_physfn	: 1;
149	u8		util_str_avail	: 1;
150	u8		tid_avail	: 1;
151	u8		rtr_avail	: 1; /* Relaxed translation allowed */
152	unsigned int	devfn;		/* DEVFN part of the RID*/
153
154	u8 pfip[CLP_PFIP_NR_SEGMENTS];	/* pci function internal path */
155	u32 uid;			/* user defined id */
156	u8 util_str[CLP_UTIL_STR_LEN];	/* utility string */
157
158	/* IRQ stuff */
159	u64		msi_addr;	/* MSI address */
160	unsigned int	max_msi;	/* maximum number of MSI's */
161	unsigned int	msi_first_bit;
162	unsigned int	msi_nr_irqs;
163	struct airq_iv *aibv;		/* adapter interrupt bit vector */
164	unsigned long	aisb;		/* number of the summary bit */
165
166	/* DMA stuff */
167	unsigned long	*dma_table;
168	int		tlb_refresh;
169
170	struct iommu_device iommu_dev;  /* IOMMU core handle */
171
172	char res_name[16];
173	bool mio_capable;
174	struct zpci_bar_struct bars[PCI_STD_NUM_BARS];
175
176	u64		start_dma;	/* Start of available DMA addresses */
177	u64		end_dma;	/* End of available DMA addresses */
178	u64		dma_mask;	/* DMA address space mask */
179
180	/* Function measurement block */
181	struct mutex fmb_lock;
182	struct zpci_fmb *fmb;
183	u16		fmb_update;	/* update interval */
184	u16		fmb_length;
185
186	u8		version;
187	enum pci_bus_speed max_bus_speed;
188
189	struct dentry	*debugfs_dev;
190
191	/* IOMMU and passthrough */
192	struct iommu_domain *s390_domain; /* attached IOMMU domain */
193	struct kvm_zdev *kzdev;
194	struct mutex kzdev_lock;
195	spinlock_t dom_lock;		/* protect s390_domain change */
196};
197
198static inline bool zdev_enabled(struct zpci_dev *zdev)
199{
200	return (zdev->fh & (1UL << 31)) ? true : false;
201}
202
203extern const struct attribute_group zpci_attr_group;
204extern const struct attribute_group pfip_attr_group;
205extern const struct attribute_group zpci_ident_attr_group;
206
207#define ARCH_PCI_DEV_GROUPS &zpci_attr_group,		 \
208			    &pfip_attr_group,		 \
209			    &zpci_ident_attr_group,
210
211extern unsigned int s390_pci_force_floating __initdata;
212extern unsigned int s390_pci_no_rid;
213
214extern union zpci_sic_iib *zpci_aipb;
215extern struct airq_iv *zpci_aif_sbv;
216
217/* -----------------------------------------------------------------------------
218  Prototypes
219----------------------------------------------------------------------------- */
220/* Base stuff */
221struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state);
222int zpci_add_device(struct zpci_dev *zdev);
223int zpci_enable_device(struct zpci_dev *);
224int zpci_reenable_device(struct zpci_dev *zdev);
225int zpci_disable_device(struct zpci_dev *);
226int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh);
227int zpci_deconfigure_device(struct zpci_dev *zdev);
228void zpci_device_reserved(struct zpci_dev *zdev);
229bool zpci_is_device_configured(struct zpci_dev *zdev);
230int zpci_scan_devices(void);
231
232int zpci_hot_reset_device(struct zpci_dev *zdev);
233int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64, u8 *);
234int zpci_unregister_ioat(struct zpci_dev *, u8);
235void zpci_remove_reserved_devices(void);
236void zpci_update_fh(struct zpci_dev *zdev, u32 fh);
237
238/* CLP */
239int clp_setup_writeback_mio(void);
240int clp_scan_pci_devices(struct list_head *scan_list);
241int clp_query_pci_fn(struct zpci_dev *zdev);
242int clp_enable_fh(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as);
243int clp_disable_fh(struct zpci_dev *zdev, u32 *fh);
244int clp_get_state(u32 fid, enum zpci_state *state);
245int clp_refresh_fh(u32 fid, u32 *fh);
246
247/* UID */
248void update_uid_checking(bool new);
249
250/* Firmware Sysfs */
251int __init __zpci_fw_sysfs_init(void);
252
253static inline int __init zpci_fw_sysfs_init(void)
254{
255	if (IS_ENABLED(CONFIG_SYSFS))
256		return __zpci_fw_sysfs_init();
257	return 0;
258}
259
260/* IOMMU Interface */
261int zpci_init_iommu(struct zpci_dev *zdev);
262void zpci_destroy_iommu(struct zpci_dev *zdev);
263int zpci_iommu_register_ioat(struct zpci_dev *zdev, u8 *status);
264
265#ifdef CONFIG_PCI
266static inline bool zpci_use_mio(struct zpci_dev *zdev)
267{
268	return static_branch_likely(&have_mio) && zdev->mio_capable;
269}
270
271/* Error handling and recovery */
272void zpci_event_error(void *);
273void zpci_event_availability(void *);
274bool zpci_is_enabled(void);
275#else /* CONFIG_PCI */
276static inline void zpci_event_error(void *e) {}
277static inline void zpci_event_availability(void *e) {}
278#endif /* CONFIG_PCI */
279
280#ifdef CONFIG_HOTPLUG_PCI_S390
281int zpci_init_slot(struct zpci_dev *);
282void zpci_exit_slot(struct zpci_dev *);
283#else /* CONFIG_HOTPLUG_PCI_S390 */
284static inline int zpci_init_slot(struct zpci_dev *zdev)
285{
286	return 0;
287}
288static inline void zpci_exit_slot(struct zpci_dev *zdev) {}
289#endif /* CONFIG_HOTPLUG_PCI_S390 */
290
291/* Helpers */
292static inline struct zpci_dev *to_zpci(struct pci_dev *pdev)
293{
294	struct zpci_bus *zbus = pdev->sysdata;
295
296	return zbus->function[pdev->devfn];
297}
298
299static inline struct zpci_dev *to_zpci_dev(struct device *dev)
300{
301	return to_zpci(to_pci_dev(dev));
302}
303
304struct zpci_dev *get_zdev_by_fid(u32);
305
306/* DMA */
307int zpci_dma_init(void);
308void zpci_dma_exit(void);
309int zpci_dma_init_device(struct zpci_dev *zdev);
310int zpci_dma_exit_device(struct zpci_dev *zdev);
311
312/* IRQ */
313int __init zpci_irq_init(void);
314void __init zpci_irq_exit(void);
315int zpci_set_irq(struct zpci_dev *zdev);
316int zpci_create_parent_msi_domain(struct zpci_bus *zbus);
317void zpci_remove_parent_msi_domain(struct zpci_bus *zbus);
318
319/* FMB */
320int zpci_fmb_enable_device(struct zpci_dev *);
321int zpci_fmb_disable_device(struct zpci_dev *);
322
323/* Debug */
324int zpci_debug_init(void);
325void zpci_debug_exit(void);
326void zpci_debug_init_device(struct zpci_dev *, const char *);
327void zpci_debug_exit_device(struct zpci_dev *);
328
329/* Error handling */
330int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *);
331int zpci_clear_error_state(struct zpci_dev *zdev);
332int zpci_reset_load_store_blocked(struct zpci_dev *zdev);
333
334#ifdef CONFIG_NUMA
335
336/* Returns the node based on PCI bus */
337static inline int __pcibus_to_node(const struct pci_bus *bus)
338{
339	return NUMA_NO_NODE;
340}
341
342static inline const struct cpumask *
343cpumask_of_pcibus(const struct pci_bus *bus)
344{
345	return cpu_online_mask;
346}
347
348#endif /* CONFIG_NUMA */
349
350#endif