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 list_head iommu_list;
121 	struct kref kref;
122 	struct rcu_head rcu;
123 	struct hotplug_slot hotplug_slot;
124 
125 	enum zpci_state state;
126 	u32		fid;		/* function ID, used by sclp */
127 	u32		fh;		/* function handle, used by insn's */
128 	u32		gisa;		/* GISA designation for passthrough */
129 	u16		vfn;		/* virtual function number */
130 	u16		pchid;		/* physical channel ID */
131 	u16		maxstbl;	/* Maximum store block size */
132 	u8		pfgid;		/* function group ID */
133 	u8		pft;		/* pci function type */
134 	u8		port;
135 	u8		dtsm;		/* Supported DT mask */
136 	u8		rid_available	: 1;
137 	u8		has_hp_slot	: 1;
138 	u8		has_resources	: 1;
139 	u8		is_physfn	: 1;
140 	u8		util_str_avail	: 1;
141 	u8		irqs_registered	: 1;
142 	u8		reserved	: 2;
143 	unsigned int	devfn;		/* DEVFN part of the RID*/
144 
145 	struct mutex lock;
146 	u8 pfip[CLP_PFIP_NR_SEGMENTS];	/* pci function internal path */
147 	u32 uid;			/* user defined id */
148 	u8 util_str[CLP_UTIL_STR_LEN];	/* utility string */
149 
150 	/* IRQ stuff */
151 	u64		msi_addr;	/* MSI address */
152 	unsigned int	max_msi;	/* maximum number of MSI's */
153 	unsigned int	msi_first_bit;
154 	unsigned int	msi_nr_irqs;
155 	struct airq_iv *aibv;		/* adapter interrupt bit vector */
156 	unsigned long	aisb;		/* number of the summary bit */
157 
158 	/* DMA stuff */
159 	unsigned long	*dma_table;
160 	int		tlb_refresh;
161 
162 	spinlock_t	iommu_bitmap_lock;
163 	unsigned long	*iommu_bitmap;
164 	unsigned long	*lazy_bitmap;
165 	unsigned long	iommu_size;
166 	unsigned long	iommu_pages;
167 	unsigned int	next_bit;
168 
169 	struct iommu_device iommu_dev;  /* IOMMU core handle */
170 
171 	char res_name[16];
172 	bool mio_capable;
173 	struct zpci_bar_struct bars[PCI_STD_NUM_BARS];
174 
175 	u64		start_dma;	/* Start of available DMA addresses */
176 	u64		end_dma;	/* End of available DMA addresses */
177 	u64		dma_mask;	/* DMA address space mask */
178 
179 	/* Function measurement block */
180 	struct zpci_fmb *fmb;
181 	u16		fmb_update;	/* update interval */
182 	u16		fmb_length;
183 	/* software counters */
184 	atomic64_t allocated_pages;
185 	atomic64_t mapped_pages;
186 	atomic64_t unmapped_pages;
187 
188 	u8		version;
189 	enum pci_bus_speed max_bus_speed;
190 
191 	struct dentry	*debugfs_dev;
192 
193 	/* IOMMU and passthrough */
194 	struct s390_domain *s390_domain; /* s390 IOMMU domain data */
195 	struct kvm_zdev *kzdev;
196 	struct mutex kzdev_lock;
197 };
198 
zdev_enabled(struct zpci_dev * zdev)199 static inline bool zdev_enabled(struct zpci_dev *zdev)
200 {
201 	return (zdev->fh & (1UL << 31)) ? true : false;
202 }
203 
204 extern const struct attribute_group *zpci_attr_groups[];
205 extern unsigned int s390_pci_force_floating __initdata;
206 extern unsigned int s390_pci_no_rid;
207 
208 extern union zpci_sic_iib *zpci_aipb;
209 extern struct airq_iv *zpci_aif_sbv;
210 
211 /* -----------------------------------------------------------------------------
212   Prototypes
213 ----------------------------------------------------------------------------- */
214 /* Base stuff */
215 struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state);
216 int zpci_enable_device(struct zpci_dev *);
217 int zpci_disable_device(struct zpci_dev *);
218 int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh);
219 int zpci_deconfigure_device(struct zpci_dev *zdev);
220 void zpci_device_reserved(struct zpci_dev *zdev);
221 bool zpci_is_device_configured(struct zpci_dev *zdev);
222 
223 int zpci_hot_reset_device(struct zpci_dev *zdev);
224 int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64, u8 *);
225 int zpci_unregister_ioat(struct zpci_dev *, u8);
226 void zpci_remove_reserved_devices(void);
227 void zpci_update_fh(struct zpci_dev *zdev, u32 fh);
228 
229 /* CLP */
230 int clp_setup_writeback_mio(void);
231 int clp_scan_pci_devices(void);
232 int clp_query_pci_fn(struct zpci_dev *zdev);
233 int clp_enable_fh(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as);
234 int clp_disable_fh(struct zpci_dev *zdev, u32 *fh);
235 int clp_get_state(u32 fid, enum zpci_state *state);
236 int clp_refresh_fh(u32 fid, u32 *fh);
237 
238 /* UID */
239 void update_uid_checking(bool new);
240 
241 /* IOMMU Interface */
242 int zpci_init_iommu(struct zpci_dev *zdev);
243 void zpci_destroy_iommu(struct zpci_dev *zdev);
244 
245 #ifdef CONFIG_PCI
zpci_use_mio(struct zpci_dev * zdev)246 static inline bool zpci_use_mio(struct zpci_dev *zdev)
247 {
248 	return static_branch_likely(&have_mio) && zdev->mio_capable;
249 }
250 
251 /* Error handling and recovery */
252 void zpci_event_error(void *);
253 void zpci_event_availability(void *);
254 bool zpci_is_enabled(void);
255 #else /* CONFIG_PCI */
zpci_event_error(void * e)256 static inline void zpci_event_error(void *e) {}
zpci_event_availability(void * e)257 static inline void zpci_event_availability(void *e) {}
258 #endif /* CONFIG_PCI */
259 
260 #ifdef CONFIG_HOTPLUG_PCI_S390
261 int zpci_init_slot(struct zpci_dev *);
262 void zpci_exit_slot(struct zpci_dev *);
263 #else /* CONFIG_HOTPLUG_PCI_S390 */
zpci_init_slot(struct zpci_dev * zdev)264 static inline int zpci_init_slot(struct zpci_dev *zdev)
265 {
266 	return 0;
267 }
zpci_exit_slot(struct zpci_dev * zdev)268 static inline void zpci_exit_slot(struct zpci_dev *zdev) {}
269 #endif /* CONFIG_HOTPLUG_PCI_S390 */
270 
271 /* Helpers */
to_zpci(struct pci_dev * pdev)272 static inline struct zpci_dev *to_zpci(struct pci_dev *pdev)
273 {
274 	struct zpci_bus *zbus = pdev->sysdata;
275 
276 	return zbus->function[pdev->devfn];
277 }
278 
to_zpci_dev(struct device * dev)279 static inline struct zpci_dev *to_zpci_dev(struct device *dev)
280 {
281 	return to_zpci(to_pci_dev(dev));
282 }
283 
284 struct zpci_dev *get_zdev_by_fid(u32);
285 
286 /* DMA */
287 int zpci_dma_init(void);
288 void zpci_dma_exit(void);
289 int zpci_dma_init_device(struct zpci_dev *zdev);
290 int zpci_dma_exit_device(struct zpci_dev *zdev);
291 
292 /* IRQ */
293 int __init zpci_irq_init(void);
294 void __init zpci_irq_exit(void);
295 
296 /* FMB */
297 int zpci_fmb_enable_device(struct zpci_dev *);
298 int zpci_fmb_disable_device(struct zpci_dev *);
299 
300 /* Debug */
301 int zpci_debug_init(void);
302 void zpci_debug_exit(void);
303 void zpci_debug_init_device(struct zpci_dev *, const char *);
304 void zpci_debug_exit_device(struct zpci_dev *);
305 
306 /* Error handling */
307 int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *);
308 int zpci_clear_error_state(struct zpci_dev *zdev);
309 int zpci_reset_load_store_blocked(struct zpci_dev *zdev);
310 
311 #ifdef CONFIG_NUMA
312 
313 /* Returns the node based on PCI bus */
__pcibus_to_node(const struct pci_bus * bus)314 static inline int __pcibus_to_node(const struct pci_bus *bus)
315 {
316 	return NUMA_NO_NODE;
317 }
318 
319 static inline const struct cpumask *
cpumask_of_pcibus(const struct pci_bus * bus)320 cpumask_of_pcibus(const struct pci_bus *bus)
321 {
322 	return cpu_online_mask;
323 }
324 
325 #endif /* CONFIG_NUMA */
326 
327 #endif
328