1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_S390_PCI_H
3 #define __ASM_S390_PCI_H
4
5 /* must be set before including pci_clp.h */
6 #define PCI_BAR_COUNT 6
7
8 #include <linux/pci.h>
9 #include <linux/mutex.h>
10 #include <linux/iommu.h>
11 #include <asm-generic/pci.h>
12 #include <asm/pci_clp.h>
13 #include <asm/pci_debug.h>
14 #include <asm/sclp.h>
15
16 #define PCIBIOS_MIN_IO 0x1000
17 #define PCIBIOS_MIN_MEM 0x10000000
18
19 #define pcibios_assign_all_busses() (0)
20
21 void __iomem *pci_iomap(struct pci_dev *, int, unsigned long);
22 void pci_iounmap(struct pci_dev *, void __iomem *);
23 int pci_domain_nr(struct pci_bus *);
24 int pci_proc_domain(struct pci_bus *);
25
26 #define ZPCI_BUS_NR 0 /* default bus number */
27 #define ZPCI_DEVFN 0 /* default device number */
28
29 #define ZPCI_NR_DMA_SPACES 1
30 #define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS
31
32 /* PCI Function Controls */
33 #define ZPCI_FC_FN_ENABLED 0x80
34 #define ZPCI_FC_ERROR 0x40
35 #define ZPCI_FC_BLOCKED 0x20
36 #define ZPCI_FC_DMA_ENABLED 0x10
37
38 #define ZPCI_FMB_DMA_COUNTER_VALID (1 << 23)
39
40 struct zpci_fmb_fmt0 {
41 u64 dma_rbytes;
42 u64 dma_wbytes;
43 };
44
45 struct zpci_fmb_fmt1 {
46 u64 rx_bytes;
47 u64 rx_packets;
48 u64 tx_bytes;
49 u64 tx_packets;
50 };
51
52 struct zpci_fmb_fmt2 {
53 u64 consumed_work_units;
54 u64 max_work_units;
55 };
56
57 struct zpci_fmb_fmt3 {
58 u64 tx_bytes;
59 };
60
61 struct zpci_fmb {
62 u32 format : 8;
63 u32 fmt_ind : 24;
64 u32 samples;
65 u64 last_update;
66 /* common counters */
67 u64 ld_ops;
68 u64 st_ops;
69 u64 stb_ops;
70 u64 rpcit_ops;
71 /* format specific counters */
72 union {
73 struct zpci_fmb_fmt0 fmt0;
74 struct zpci_fmb_fmt1 fmt1;
75 struct zpci_fmb_fmt2 fmt2;
76 struct zpci_fmb_fmt3 fmt3;
77 };
78 } __packed __aligned(128);
79
80 enum zpci_state {
81 ZPCI_FN_STATE_STANDBY = 0,
82 ZPCI_FN_STATE_CONFIGURED = 1,
83 ZPCI_FN_STATE_RESERVED = 2,
84 ZPCI_FN_STATE_ONLINE = 3,
85 };
86
87 struct zpci_bar_struct {
88 struct resource *res; /* bus resource */
89 void __iomem *mio_wb;
90 void __iomem *mio_wt;
91 u32 val; /* bar start & 3 flag bits */
92 u16 map_idx; /* index into bar mapping array */
93 u8 size; /* order 2 exponent */
94 };
95
96 struct s390_domain;
97
98 /* Private data per function */
99 struct zpci_dev {
100 struct pci_bus *bus;
101 struct list_head entry; /* list of all zpci_devices, needed for hotplug, etc. */
102
103 enum zpci_state state;
104 u32 fid; /* function ID, used by sclp */
105 u32 fh; /* function handle, used by insn's */
106 u16 vfn; /* virtual function number */
107 u16 pchid; /* physical channel ID */
108 u8 pfgid; /* function group ID */
109 u8 pft; /* pci function type */
110 u16 domain;
111
112 struct mutex lock;
113 u8 pfip[CLP_PFIP_NR_SEGMENTS]; /* pci function internal path */
114 u32 uid; /* user defined id */
115 u8 util_str[CLP_UTIL_STR_LEN]; /* utility string */
116
117 /* IRQ stuff */
118 u64 msi_addr; /* MSI address */
119 unsigned int max_msi; /* maximum number of MSI's */
120 unsigned int msi_first_bit;
121 unsigned int msi_nr_irqs;
122 struct airq_iv *aibv; /* adapter interrupt bit vector */
123 unsigned long aisb; /* number of the summary bit */
124
125 /* DMA stuff */
126 unsigned long *dma_table;
127 spinlock_t dma_table_lock;
128 int tlb_refresh;
129
130 spinlock_t iommu_bitmap_lock;
131 unsigned long *iommu_bitmap;
132 unsigned long *lazy_bitmap;
133 unsigned long iommu_size;
134 unsigned long iommu_pages;
135 unsigned int next_bit;
136
137 struct iommu_device iommu_dev; /* IOMMU core handle */
138
139 char res_name[16];
140 bool mio_capable;
141 struct zpci_bar_struct bars[PCI_BAR_COUNT];
142
143 u64 start_dma; /* Start of available DMA addresses */
144 u64 end_dma; /* End of available DMA addresses */
145 u64 dma_mask; /* DMA address space mask */
146
147 /* Function measurement block */
148 struct zpci_fmb *fmb;
149 u16 fmb_update; /* update interval */
150 u16 fmb_length;
151 /* software counters */
152 atomic64_t allocated_pages;
153 atomic64_t mapped_pages;
154 atomic64_t unmapped_pages;
155
156 enum pci_bus_speed max_bus_speed;
157
158 struct dentry *debugfs_dev;
159
160 struct s390_domain *s390_domain; /* s390 IOMMU domain data */
161 };
162
zdev_enabled(struct zpci_dev * zdev)163 static inline bool zdev_enabled(struct zpci_dev *zdev)
164 {
165 return (zdev->fh & (1UL << 31)) ? true : false;
166 }
167
168 extern const struct attribute_group *zpci_attr_groups[];
169 extern unsigned int s390_pci_force_floating __initdata;
170
171 /* -----------------------------------------------------------------------------
172 Prototypes
173 ----------------------------------------------------------------------------- */
174 /* Base stuff */
175 int zpci_create_device(struct zpci_dev *);
176 void zpci_remove_device(struct zpci_dev *zdev);
177 int zpci_enable_device(struct zpci_dev *);
178 int zpci_disable_device(struct zpci_dev *);
179 int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64);
180 int zpci_unregister_ioat(struct zpci_dev *, u8);
181 void zpci_remove_reserved_devices(void);
182
183 /* CLP */
184 int clp_scan_pci_devices(void);
185 int clp_rescan_pci_devices(void);
186 int clp_rescan_pci_devices_simple(u32 *fid);
187 int clp_add_pci_device(u32, u32, int);
188 int clp_enable_fh(struct zpci_dev *, u8);
189 int clp_disable_fh(struct zpci_dev *);
190 int clp_get_state(u32 fid, enum zpci_state *state);
191
192 /* IOMMU Interface */
193 int zpci_init_iommu(struct zpci_dev *zdev);
194 void zpci_destroy_iommu(struct zpci_dev *zdev);
195
196 #ifdef CONFIG_PCI
zpci_use_mio(struct zpci_dev * zdev)197 static inline bool zpci_use_mio(struct zpci_dev *zdev)
198 {
199 return static_branch_likely(&have_mio) && zdev->mio_capable;
200 }
201
202 /* Error handling and recovery */
203 void zpci_event_error(void *);
204 void zpci_event_availability(void *);
205 void zpci_rescan(void);
206 bool zpci_is_enabled(void);
207 #else /* CONFIG_PCI */
zpci_event_error(void * e)208 static inline void zpci_event_error(void *e) {}
zpci_event_availability(void * e)209 static inline void zpci_event_availability(void *e) {}
zpci_rescan(void)210 static inline void zpci_rescan(void) {}
211 #endif /* CONFIG_PCI */
212
213 #ifdef CONFIG_HOTPLUG_PCI_S390
214 int zpci_init_slot(struct zpci_dev *);
215 void zpci_exit_slot(struct zpci_dev *);
216 #else /* CONFIG_HOTPLUG_PCI_S390 */
zpci_init_slot(struct zpci_dev * zdev)217 static inline int zpci_init_slot(struct zpci_dev *zdev)
218 {
219 return 0;
220 }
zpci_exit_slot(struct zpci_dev * zdev)221 static inline void zpci_exit_slot(struct zpci_dev *zdev) {}
222 #endif /* CONFIG_HOTPLUG_PCI_S390 */
223
224 /* Helpers */
to_zpci(struct pci_dev * pdev)225 static inline struct zpci_dev *to_zpci(struct pci_dev *pdev)
226 {
227 return pdev->sysdata;
228 }
229
230 struct zpci_dev *get_zdev_by_fid(u32);
231
232 /* DMA */
233 int zpci_dma_init(void);
234 void zpci_dma_exit(void);
235
236 int __init zpci_irq_init(void);
237 void __init zpci_irq_exit(void);
238
239 /* FMB */
240 int zpci_fmb_enable_device(struct zpci_dev *);
241 int zpci_fmb_disable_device(struct zpci_dev *);
242
243 /* Debug */
244 int zpci_debug_init(void);
245 void zpci_debug_exit(void);
246 void zpci_debug_init_device(struct zpci_dev *, const char *);
247 void zpci_debug_exit_device(struct zpci_dev *);
248 void zpci_debug_info(struct zpci_dev *, struct seq_file *);
249
250 /* Error reporting */
251 int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *);
252
253 #ifdef CONFIG_NUMA
254
255 /* Returns the node based on PCI bus */
__pcibus_to_node(const struct pci_bus * bus)256 static inline int __pcibus_to_node(const struct pci_bus *bus)
257 {
258 return NUMA_NO_NODE;
259 }
260
261 static inline const struct cpumask *
cpumask_of_pcibus(const struct pci_bus * bus)262 cpumask_of_pcibus(const struct pci_bus *bus)
263 {
264 return cpu_online_mask;
265 }
266
267 #endif /* CONFIG_NUMA */
268
269 #endif
270