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 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 };
89
90 struct zpci_bar_struct {
91 struct resource *res; /* bus resource */
92 void __iomem *mio_wb;
93 void __iomem *mio_wt;
94 u32 val; /* bar start & 3 flag bits */
95 u16 map_idx; /* index into bar mapping array */
96 u8 size; /* order 2 exponent */
97 };
98
99 struct s390_domain;
100 struct kvm_zdev;
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 kref kref;
121 struct hotplug_slot hotplug_slot;
122
123 enum zpci_state state;
124 u32 fid; /* function ID, used by sclp */
125 u32 fh; /* function handle, used by insn's */
126 u32 gisa; /* GISA designation for passthrough */
127 u16 vfn; /* virtual function number */
128 u16 pchid; /* physical channel ID */
129 u16 maxstbl; /* Maximum store block size */
130 u8 pfgid; /* function group ID */
131 u8 pft; /* pci function type */
132 u8 port;
133 u8 dtsm; /* Supported DT mask */
134 u8 rid_available : 1;
135 u8 has_hp_slot : 1;
136 u8 has_resources : 1;
137 u8 is_physfn : 1;
138 u8 util_str_avail : 1;
139 u8 irqs_registered : 1;
140 u8 reserved : 2;
141 unsigned int devfn; /* DEVFN part of the RID*/
142
143 struct mutex lock;
144 u8 pfip[CLP_PFIP_NR_SEGMENTS]; /* pci function internal path */
145 u32 uid; /* user defined id */
146 u8 util_str[CLP_UTIL_STR_LEN]; /* utility string */
147
148 /* IRQ stuff */
149 u64 msi_addr; /* MSI address */
150 unsigned int max_msi; /* maximum number of MSI's */
151 unsigned int msi_first_bit;
152 unsigned int msi_nr_irqs;
153 struct airq_iv *aibv; /* adapter interrupt bit vector */
154 unsigned long aisb; /* number of the summary bit */
155
156 /* DMA stuff */
157 unsigned long *dma_table;
158 spinlock_t dma_table_lock;
159 int tlb_refresh;
160
161 spinlock_t iommu_bitmap_lock;
162 unsigned long *iommu_bitmap;
163 unsigned long *lazy_bitmap;
164 unsigned long iommu_size;
165 unsigned long iommu_pages;
166 unsigned int next_bit;
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 zpci_fmb *fmb;
180 u16 fmb_update; /* update interval */
181 u16 fmb_length;
182 /* software counters */
183 atomic64_t allocated_pages;
184 atomic64_t mapped_pages;
185 atomic64_t unmapped_pages;
186
187 u8 version;
188 enum pci_bus_speed max_bus_speed;
189
190 struct dentry *debugfs_dev;
191
192 /* IOMMU and passthrough */
193 struct s390_domain *s390_domain; /* s390 IOMMU domain data */
194 struct kvm_zdev *kzdev;
195 struct mutex kzdev_lock;
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_groups[];
204 extern unsigned int s390_pci_force_floating __initdata;
205 extern unsigned int s390_pci_no_rid;
206
207 extern union zpci_sic_iib *zpci_aipb;
208 extern struct airq_iv *zpci_aif_sbv;
209
210 /* -----------------------------------------------------------------------------
211 Prototypes
212 ----------------------------------------------------------------------------- */
213 /* Base stuff */
214 struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state);
215 int zpci_enable_device(struct zpci_dev *);
216 int zpci_disable_device(struct zpci_dev *);
217 int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh);
218 int zpci_deconfigure_device(struct zpci_dev *zdev);
219 void zpci_device_reserved(struct zpci_dev *zdev);
220 bool zpci_is_device_configured(struct zpci_dev *zdev);
221
222 int zpci_hot_reset_device(struct zpci_dev *zdev);
223 int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64);
224 int zpci_unregister_ioat(struct zpci_dev *, u8);
225 void zpci_remove_reserved_devices(void);
226 void zpci_update_fh(struct zpci_dev *zdev, u32 fh);
227
228 /* CLP */
229 int clp_setup_writeback_mio(void);
230 int clp_scan_pci_devices(void);
231 int clp_query_pci_fn(struct zpci_dev *zdev);
232 int clp_enable_fh(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as);
233 int clp_disable_fh(struct zpci_dev *zdev, u32 *fh);
234 int clp_get_state(u32 fid, enum zpci_state *state);
235 int clp_refresh_fh(u32 fid, u32 *fh);
236
237 /* UID */
238 void update_uid_checking(bool new);
239
240 /* IOMMU Interface */
241 int zpci_init_iommu(struct zpci_dev *zdev);
242 void zpci_destroy_iommu(struct zpci_dev *zdev);
243
244 #ifdef CONFIG_PCI
zpci_use_mio(struct zpci_dev * zdev)245 static inline bool zpci_use_mio(struct zpci_dev *zdev)
246 {
247 return static_branch_likely(&have_mio) && zdev->mio_capable;
248 }
249
250 /* Error handling and recovery */
251 void zpci_event_error(void *);
252 void zpci_event_availability(void *);
253 bool zpci_is_enabled(void);
254 #else /* CONFIG_PCI */
zpci_event_error(void * e)255 static inline void zpci_event_error(void *e) {}
zpci_event_availability(void * e)256 static inline void zpci_event_availability(void *e) {}
257 #endif /* CONFIG_PCI */
258
259 #ifdef CONFIG_HOTPLUG_PCI_S390
260 int zpci_init_slot(struct zpci_dev *);
261 void zpci_exit_slot(struct zpci_dev *);
262 #else /* CONFIG_HOTPLUG_PCI_S390 */
zpci_init_slot(struct zpci_dev * zdev)263 static inline int zpci_init_slot(struct zpci_dev *zdev)
264 {
265 return 0;
266 }
zpci_exit_slot(struct zpci_dev * zdev)267 static inline void zpci_exit_slot(struct zpci_dev *zdev) {}
268 #endif /* CONFIG_HOTPLUG_PCI_S390 */
269
270 /* Helpers */
to_zpci(struct pci_dev * pdev)271 static inline struct zpci_dev *to_zpci(struct pci_dev *pdev)
272 {
273 struct zpci_bus *zbus = pdev->sysdata;
274
275 return zbus->function[pdev->devfn];
276 }
277
to_zpci_dev(struct device * dev)278 static inline struct zpci_dev *to_zpci_dev(struct device *dev)
279 {
280 return to_zpci(to_pci_dev(dev));
281 }
282
283 struct zpci_dev *get_zdev_by_fid(u32);
284
285 /* DMA */
286 int zpci_dma_init(void);
287 void zpci_dma_exit(void);
288 int zpci_dma_init_device(struct zpci_dev *zdev);
289 int zpci_dma_exit_device(struct zpci_dev *zdev);
290
291 /* IRQ */
292 int __init zpci_irq_init(void);
293 void __init zpci_irq_exit(void);
294
295 /* FMB */
296 int zpci_fmb_enable_device(struct zpci_dev *);
297 int zpci_fmb_disable_device(struct zpci_dev *);
298
299 /* Debug */
300 int zpci_debug_init(void);
301 void zpci_debug_exit(void);
302 void zpci_debug_init_device(struct zpci_dev *, const char *);
303 void zpci_debug_exit_device(struct zpci_dev *);
304
305 /* Error handling */
306 int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *);
307 int zpci_clear_error_state(struct zpci_dev *zdev);
308 int zpci_reset_load_store_blocked(struct zpci_dev *zdev);
309
310 #ifdef CONFIG_NUMA
311
312 /* Returns the node based on PCI bus */
__pcibus_to_node(const struct pci_bus * bus)313 static inline int __pcibus_to_node(const struct pci_bus *bus)
314 {
315 return NUMA_NO_NODE;
316 }
317
318 static inline const struct cpumask *
cpumask_of_pcibus(const struct pci_bus * bus)319 cpumask_of_pcibus(const struct pci_bus *bus)
320 {
321 return cpu_online_mask;
322 }
323
324 #endif /* CONFIG_NUMA */
325
326 #endif
327