summaryrefslogtreecommitdiffstats
path: root/arch/s390/include/asm/pci.h
blob: 3a06c264ea533813115559d72f2762dd5a207902 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
/* 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 <asm-generic/pci.h>
#include <asm/pci_clp.h>
#include <asm/pci_debug.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_DEVFN			0	/* default device number */

#define ZPCI_NR_DMA_SPACES		1
#define ZPCI_NR_DEVICES			CONFIG_PCI_NR_FUNCTIONS

/* 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,
	ZPCI_FN_STATE_ONLINE = 3,
};

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;

/* Private data per function */
struct zpci_dev {
	struct pci_bus	*bus;
	struct list_head entry;		/* list of all zpci_devices, needed for hotplug, etc. */

	enum zpci_state state;
	u32		fid;		/* function ID, used by sclp */
	u32		fh;		/* function handle, used by insn's */
	u16		vfn;		/* virtual function number */
	u16		pchid;		/* physical channel ID */
	u8		pfgid;		/* function group ID */
	u8		pft;		/* pci function type */
	u16		domain;

	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;

	enum pci_bus_speed max_bus_speed;

	struct dentry	*debugfs_dev;

	struct s390_domain *s390_domain; /* s390 IOMMU domain data */
};

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;

/* -----------------------------------------------------------------------------
  Prototypes
----------------------------------------------------------------------------- */
/* Base stuff */
int zpci_create_device(struct zpci_dev *);
void zpci_remove_device(struct zpci_dev *zdev);
int zpci_enable_device(struct zpci_dev *);
int zpci_disable_device(struct zpci_dev *);
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);

/* CLP */
int clp_scan_pci_devices(void);
int clp_rescan_pci_devices(void);
int clp_rescan_pci_devices_simple(void);
int clp_add_pci_device(u32, u32, int);
int clp_enable_fh(struct zpci_dev *, u8);
int clp_disable_fh(struct zpci_dev *);
int clp_get_state(u32 fid, enum zpci_state *state);

/* 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 *);
void zpci_rescan(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) {}
static inline void zpci_rescan(void) {}
#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)
{
	return pdev->sysdata;
}

struct zpci_dev *get_zdev_by_fid(u32);

/* DMA */
int zpci_dma_init(void);
void zpci_dma_exit(void);

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 *);
void zpci_debug_info(struct zpci_dev *, struct seq_file *);

/* Error reporting */
int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *);

#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