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/pci_hotplug.h>
9 #include <asm-generic/pci.h>
10 #include <asm/pci_clp.h>
11 #include <asm/pci_debug.h>
12 #include <asm/sclp.h>
13
14 #define PCIBIOS_MIN_IO 0x1000
15 #define PCIBIOS_MIN_MEM 0x10000000
16
17 #define pcibios_assign_all_busses() (0)
18
19 void __iomem *pci_iomap(struct pci_dev *, int, unsigned long);
20 void pci_iounmap(struct pci_dev *, void __iomem *);
21 int pci_domain_nr(struct pci_bus *);
22 int pci_proc_domain(struct pci_bus *);
23
24 #define ZPCI_BUS_NR 0 /* default bus number */
25
26 #define ZPCI_NR_DMA_SPACES 1
27 #define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS
28 #define ZPCI_DOMAIN_BITMAP_SIZE (1 << 16)
29
30 #ifdef PCI
31 #if (ZPCI_NR_DEVICES > ZPCI_DOMAIN_BITMAP_SIZE)
32 # error ZPCI_NR_DEVICES can not be bigger than ZPCI_DOMAIN_BITMAP_SIZE
33 #endif
34 #endif /* PCI */
35
36 /* PCI Function Controls */
37 #define ZPCI_FC_FN_ENABLED 0x80
38 #define ZPCI_FC_ERROR 0x40
39 #define ZPCI_FC_BLOCKED 0x20
40 #define ZPCI_FC_DMA_ENABLED 0x10
41
42 #define ZPCI_FMB_DMA_COUNTER_VALID (1 << 23)
43
44 struct zpci_fmb_fmt0 {
45 u64 dma_rbytes;
46 u64 dma_wbytes;
47 };
48
49 struct zpci_fmb_fmt1 {
50 u64 rx_bytes;
51 u64 rx_packets;
52 u64 tx_bytes;
53 u64 tx_packets;
54 };
55
56 struct zpci_fmb_fmt2 {
57 u64 consumed_work_units;
58 u64 max_work_units;
59 };
60
61 struct zpci_fmb_fmt3 {
62 u64 tx_bytes;
63 };
64
65 struct zpci_fmb {
66 u32 format : 8;
67 u32 fmt_ind : 24;
68 u32 samples;
69 u64 last_update;
70 /* common counters */
71 u64 ld_ops;
72 u64 st_ops;
73 u64 stb_ops;
74 u64 rpcit_ops;
75 /* format specific counters */
76 union {
77 struct zpci_fmb_fmt0 fmt0;
78 struct zpci_fmb_fmt1 fmt1;
79 struct zpci_fmb_fmt2 fmt2;
80 struct zpci_fmb_fmt3 fmt3;
81 };
82 } __packed __aligned(128);
83
84 enum zpci_state {
85 ZPCI_FN_STATE_STANDBY = 0,
86 ZPCI_FN_STATE_CONFIGURED = 1,
87 ZPCI_FN_STATE_RESERVED = 2,
88 ZPCI_FN_STATE_ONLINE = 3,
89 };
90
91 struct zpci_bar_struct {
92 struct resource *res; /* bus resource */
93 void __iomem *mio_wb;
94 void __iomem *mio_wt;
95 u32 val; /* bar start & 3 flag bits */
96 u16 map_idx; /* index into bar mapping array */
97 u8 size; /* order 2 exponent */
98 };
99
100 struct s390_domain;
101
102 #define ZPCI_FUNCTIONS_PER_BUS 256
103 struct zpci_bus {
104 struct kref kref;
105 struct pci_bus *bus;
106 struct zpci_dev *function[ZPCI_FUNCTIONS_PER_BUS];
107 struct list_head resources;
108 struct list_head bus_next;
109 struct resource bus_resource;
110 int pchid;
111 int domain_nr;
112 bool multifunction;
113 enum pci_bus_speed max_bus_speed;
114 };
115
116 /* Private data per function */
117 struct zpci_dev {
118 struct zpci_bus *zbus;
119 struct list_head entry; /* list of all zpci_devices, needed for hotplug, etc. */
120 struct list_head bus_next;
121 struct kref kref;
122 struct hotplug_slot hotplug_slot;
123
124 enum zpci_state state;
125 u32 fid; /* function ID, used by sclp */
126 u32 fh; /* function handle, used by insn's */
127 u16 vfn; /* virtual function number */
128 u16 pchid; /* physical channel ID */
129 u8 pfgid; /* function group ID */
130 u8 pft; /* pci function type */
131 u8 port;
132 u8 rid_available : 1;
133 u8 has_hp_slot : 1;
134 u8 is_physfn : 1;
135 u8 util_str_avail : 1;
136 u8 reserved : 4;
137 unsigned int devfn; /* DEVFN part of the RID*/
138
139 struct mutex lock;
140 u8 pfip[CLP_PFIP_NR_SEGMENTS]; /* pci function internal path */
141 u32 uid; /* user defined id */
142 u8 util_str[CLP_UTIL_STR_LEN]; /* utility string */
143
144 /* IRQ stuff */
145 u64 msi_addr; /* MSI address */
146 unsigned int max_msi; /* maximum number of MSI's */
147 unsigned int msi_first_bit;
148 unsigned int msi_nr_irqs;
149 struct airq_iv *aibv; /* adapter interrupt bit vector */
150 unsigned long aisb; /* number of the summary bit */
151
152 /* DMA stuff */
153 unsigned long *dma_table;
154 spinlock_t dma_table_lock;
155 int tlb_refresh;
156
157 spinlock_t iommu_bitmap_lock;
158 unsigned long *iommu_bitmap;
159 unsigned long *lazy_bitmap;
160 unsigned long iommu_size;
161 unsigned long iommu_pages;
162 unsigned int next_bit;
163
164 struct iommu_device iommu_dev; /* IOMMU core handle */
165
166 char res_name[16];
167 bool mio_capable;
168 struct zpci_bar_struct bars[PCI_STD_NUM_BARS];
169
170 u64 start_dma; /* Start of available DMA addresses */
171 u64 end_dma; /* End of available DMA addresses */
172 u64 dma_mask; /* DMA address space mask */
173
174 /* Function measurement block */
175 struct zpci_fmb *fmb;
176 u16 fmb_update; /* update interval */
177 u16 fmb_length;
178 /* software counters */
179 atomic64_t allocated_pages;
180 atomic64_t mapped_pages;
181 atomic64_t unmapped_pages;
182
183 u8 version;
184 enum pci_bus_speed max_bus_speed;
185
186 struct dentry *debugfs_dev;
187
188 struct s390_domain *s390_domain; /* s390 IOMMU domain data */
189 };
190
zdev_enabled(struct zpci_dev * zdev)191 static inline bool zdev_enabled(struct zpci_dev *zdev)
192 {
193 return (zdev->fh & (1UL << 31)) ? true : false;
194 }
195
196 extern const struct attribute_group *zpci_attr_groups[];
197 extern unsigned int s390_pci_force_floating __initdata;
198 extern unsigned int s390_pci_no_rid;
199
200 /* -----------------------------------------------------------------------------
201 Prototypes
202 ----------------------------------------------------------------------------- */
203 /* Base stuff */
204 int zpci_create_device(u32 fid, u32 fh, enum zpci_state state);
205 void zpci_remove_device(struct zpci_dev *zdev, bool set_error);
206 int zpci_enable_device(struct zpci_dev *);
207 int zpci_disable_device(struct zpci_dev *);
208 void zpci_device_reserved(struct zpci_dev *zdev);
209 bool zpci_is_device_configured(struct zpci_dev *zdev);
210
211 int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64);
212 int zpci_unregister_ioat(struct zpci_dev *, u8);
213 void zpci_remove_reserved_devices(void);
214
215 /* CLP */
216 int clp_setup_writeback_mio(void);
217 int clp_scan_pci_devices(void);
218 int clp_query_pci_fn(struct zpci_dev *zdev);
219 int clp_enable_fh(struct zpci_dev *, u8);
220 int clp_disable_fh(struct zpci_dev *);
221 int clp_get_state(u32 fid, enum zpci_state *state);
222
223 /* UID */
224 void update_uid_checking(bool new);
225
226 /* IOMMU Interface */
227 int zpci_init_iommu(struct zpci_dev *zdev);
228 void zpci_destroy_iommu(struct zpci_dev *zdev);
229
230 #ifdef CONFIG_PCI
zpci_use_mio(struct zpci_dev * zdev)231 static inline bool zpci_use_mio(struct zpci_dev *zdev)
232 {
233 return static_branch_likely(&have_mio) && zdev->mio_capable;
234 }
235
236 /* Error handling and recovery */
237 void zpci_event_error(void *);
238 void zpci_event_availability(void *);
239 bool zpci_is_enabled(void);
240 #else /* CONFIG_PCI */
zpci_event_error(void * e)241 static inline void zpci_event_error(void *e) {}
zpci_event_availability(void * e)242 static inline void zpci_event_availability(void *e) {}
243 #endif /* CONFIG_PCI */
244
245 #ifdef CONFIG_HOTPLUG_PCI_S390
246 int zpci_init_slot(struct zpci_dev *);
247 void zpci_exit_slot(struct zpci_dev *);
248 #else /* CONFIG_HOTPLUG_PCI_S390 */
zpci_init_slot(struct zpci_dev * zdev)249 static inline int zpci_init_slot(struct zpci_dev *zdev)
250 {
251 return 0;
252 }
zpci_exit_slot(struct zpci_dev * zdev)253 static inline void zpci_exit_slot(struct zpci_dev *zdev) {}
254 #endif /* CONFIG_HOTPLUG_PCI_S390 */
255
256 /* Helpers */
to_zpci(struct pci_dev * pdev)257 static inline struct zpci_dev *to_zpci(struct pci_dev *pdev)
258 {
259 struct zpci_bus *zbus = pdev->sysdata;
260
261 return zbus->function[pdev->devfn];
262 }
263
to_zpci_dev(struct device * dev)264 static inline struct zpci_dev *to_zpci_dev(struct device *dev)
265 {
266 return to_zpci(to_pci_dev(dev));
267 }
268
269 struct zpci_dev *get_zdev_by_fid(u32);
270
271 /* DMA */
272 int zpci_dma_init(void);
273 void zpci_dma_exit(void);
274
275 int __init zpci_irq_init(void);
276 void __init zpci_irq_exit(void);
277
278 /* FMB */
279 int zpci_fmb_enable_device(struct zpci_dev *);
280 int zpci_fmb_disable_device(struct zpci_dev *);
281
282 /* Debug */
283 int zpci_debug_init(void);
284 void zpci_debug_exit(void);
285 void zpci_debug_init_device(struct zpci_dev *, const char *);
286 void zpci_debug_exit_device(struct zpci_dev *);
287
288 /* Error reporting */
289 int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *);
290
291 #ifdef CONFIG_NUMA
292
293 /* Returns the node based on PCI bus */
__pcibus_to_node(const struct pci_bus * bus)294 static inline int __pcibus_to_node(const struct pci_bus *bus)
295 {
296 return NUMA_NO_NODE;
297 }
298
299 static inline const struct cpumask *
cpumask_of_pcibus(const struct pci_bus * bus)300 cpumask_of_pcibus(const struct pci_bus *bus)
301 {
302 return cpu_online_mask;
303 }
304
305 #endif /* CONFIG_NUMA */
306
307 #endif
308