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