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