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
23 void __iomem *pci_iomap(struct pci_dev *, int, unsigned long);
24 void pci_iounmap(struct pci_dev *, void __iomem *);
25 int pci_domain_nr(struct pci_bus *);
26 int 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
48 struct zpci_fmb_fmt0 {
49 u64 dma_rbytes;
50 u64 dma_wbytes;
51 };
52
53 struct zpci_fmb_fmt1 {
54 u64 rx_bytes;
55 u64 rx_packets;
56 u64 tx_bytes;
57 u64 tx_packets;
58 };
59
60 struct zpci_fmb_fmt2 {
61 u64 consumed_work_units;
62 u64 max_work_units;
63 };
64
65 struct zpci_fmb_fmt3 {
66 u64 tx_bytes;
67 };
68
69 struct 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
88 enum zpci_state {
89 ZPCI_FN_STATE_STANDBY = 0,
90 ZPCI_FN_STATE_CONFIGURED = 1,
91 ZPCI_FN_STATE_RESERVED = 2,
92 };
93
94 struct 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
103 struct kvm_zdev;
104
105 #define ZPCI_FUNCTIONS_PER_BUS 256
106 struct 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 */
122 struct 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
zdev_enabled(struct zpci_dev * zdev)198 static inline bool zdev_enabled(struct zpci_dev *zdev)
199 {
200 return (zdev->fh & (1UL << 31)) ? true : false;
201 }
202
203 extern const struct attribute_group zpci_attr_group;
204 extern const struct attribute_group pfip_attr_group;
205 extern 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
211 extern unsigned int s390_pci_force_floating __initdata;
212 extern unsigned int s390_pci_no_rid;
213
214 extern union zpci_sic_iib *zpci_aipb;
215 extern struct airq_iv *zpci_aif_sbv;
216
217 /* -----------------------------------------------------------------------------
218 Prototypes
219 ----------------------------------------------------------------------------- */
220 /* Base stuff */
221 struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state);
222 int zpci_add_device(struct zpci_dev *zdev);
223 int zpci_enable_device(struct zpci_dev *);
224 int zpci_reenable_device(struct zpci_dev *zdev);
225 int zpci_disable_device(struct zpci_dev *);
226 int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh);
227 int zpci_deconfigure_device(struct zpci_dev *zdev);
228 void zpci_device_reserved(struct zpci_dev *zdev);
229 bool zpci_is_device_configured(struct zpci_dev *zdev);
230 int zpci_scan_devices(void);
231
232 int zpci_hot_reset_device(struct zpci_dev *zdev);
233 int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64, u8 *);
234 int zpci_unregister_ioat(struct zpci_dev *, u8);
235 void zpci_remove_reserved_devices(void);
236 void zpci_update_fh(struct zpci_dev *zdev, u32 fh);
237
238 /* CLP */
239 int clp_setup_writeback_mio(void);
240 int clp_scan_pci_devices(struct list_head *scan_list);
241 int clp_query_pci_fn(struct zpci_dev *zdev);
242 int clp_enable_fh(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as);
243 int clp_disable_fh(struct zpci_dev *zdev, u32 *fh);
244 int clp_get_state(u32 fid, enum zpci_state *state);
245 int clp_refresh_fh(u32 fid, u32 *fh);
246
247 /* UID */
248 void update_uid_checking(bool new);
249
250 /* Firmware Sysfs */
251 int __init __zpci_fw_sysfs_init(void);
252
zpci_fw_sysfs_init(void)253 static 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 */
261 int zpci_init_iommu(struct zpci_dev *zdev);
262 void zpci_destroy_iommu(struct zpci_dev *zdev);
263 int zpci_iommu_register_ioat(struct zpci_dev *zdev, u8 *status);
264
265 #ifdef CONFIG_PCI
zpci_use_mio(struct zpci_dev * zdev)266 static 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 */
272 void zpci_event_error(void *);
273 void zpci_event_availability(void *);
274 bool zpci_is_enabled(void);
275 #else /* CONFIG_PCI */
zpci_event_error(void * e)276 static inline void zpci_event_error(void *e) {}
zpci_event_availability(void * e)277 static inline void zpci_event_availability(void *e) {}
278 #endif /* CONFIG_PCI */
279
280 #ifdef CONFIG_HOTPLUG_PCI_S390
281 int zpci_init_slot(struct zpci_dev *);
282 void zpci_exit_slot(struct zpci_dev *);
283 #else /* CONFIG_HOTPLUG_PCI_S390 */
zpci_init_slot(struct zpci_dev * zdev)284 static inline int zpci_init_slot(struct zpci_dev *zdev)
285 {
286 return 0;
287 }
zpci_exit_slot(struct zpci_dev * zdev)288 static inline void zpci_exit_slot(struct zpci_dev *zdev) {}
289 #endif /* CONFIG_HOTPLUG_PCI_S390 */
290
291 /* Helpers */
to_zpci(struct pci_dev * pdev)292 static 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
to_zpci_dev(struct device * dev)299 static inline struct zpci_dev *to_zpci_dev(struct device *dev)
300 {
301 return to_zpci(to_pci_dev(dev));
302 }
303
304 struct zpci_dev *get_zdev_by_fid(u32);
305
306 /* DMA */
307 int zpci_dma_init(void);
308 void zpci_dma_exit(void);
309 int zpci_dma_init_device(struct zpci_dev *zdev);
310 int zpci_dma_exit_device(struct zpci_dev *zdev);
311
312 /* IRQ */
313 int __init zpci_irq_init(void);
314 void __init zpci_irq_exit(void);
315 int zpci_set_irq(struct zpci_dev *zdev);
316 int zpci_create_parent_msi_domain(struct zpci_bus *zbus);
317 void zpci_remove_parent_msi_domain(struct zpci_bus *zbus);
318
319 /* FMB */
320 int zpci_fmb_enable_device(struct zpci_dev *);
321 int zpci_fmb_disable_device(struct zpci_dev *);
322
323 /* Debug */
324 int zpci_debug_init(void);
325 void zpci_debug_exit(void);
326 void zpci_debug_init_device(struct zpci_dev *, const char *);
327 void zpci_debug_exit_device(struct zpci_dev *);
328
329 /* Error handling */
330 int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *);
331 int zpci_clear_error_state(struct zpci_dev *zdev);
332 int zpci_reset_load_store_blocked(struct zpci_dev *zdev);
333
334 #ifdef CONFIG_NUMA
335
336 /* Returns the node based on PCI bus */
__pcibus_to_node(const struct pci_bus * bus)337 static inline int __pcibus_to_node(const struct pci_bus *bus)
338 {
339 return NUMA_NO_NODE;
340 }
341
342 static inline const struct cpumask *
cpumask_of_pcibus(const struct pci_bus * bus)343 cpumask_of_pcibus(const struct pci_bus *bus)
344 {
345 return cpu_online_mask;
346 }
347
348 #endif /* CONFIG_NUMA */
349
350 #endif
351