summaryrefslogtreecommitdiff
path: root/include/linux/msi.h
blob: 6b584cc4757cdff7edeba1c6a6f22e39fd28307a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef LINUX_MSI_H
#define LINUX_MSI_H

#include <linux/kobject.h>
#include <linux/list.h>

struct msi_msg {
	u32	address_lo;	/* low 32 bits of msi message address */
	u32	address_hi;	/* high 32 bits of msi message address */
	u32	data;		/* 16 bits of msi message data */
};

extern int pci_msi_ignore_mask;
/* Helper functions */
struct irq_data;
struct msi_desc;
struct pci_dev;
struct platform_msi_priv_data;
void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
#ifdef CONFIG_GENERIC_MSI_IRQ
void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
#else
static inline void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
{
}
#endif

typedef void (*irq_write_msi_msg_t)(struct msi_desc *desc,
				    struct msi_msg *msg);

/**
 * platform_msi_desc - Platform device specific msi descriptor data
 * @msi_priv_data:	Pointer to platform private data
 * @msi_index:		The index of the MSI descriptor for multi MSI
 */
struct platform_msi_desc {
	struct platform_msi_priv_data	*msi_priv_data;
	u16				msi_index;
};

/**
 * fsl_mc_msi_desc - FSL-MC device specific msi descriptor data
 * @msi_index:		The index of the MSI descriptor
 */
struct fsl_mc_msi_desc {
	u16				msi_index;
};

/**
 * ti_sci_inta_msi_desc - TISCI based INTA specific msi descriptor data
 * @dev_index: TISCI device index
 */
struct ti_sci_inta_msi_desc {
	u16	dev_index;
};

/**
 * struct msi_desc - Descriptor structure for MSI based interrupts
 * @list:	List head for management
 * @irq:	The base interrupt number
 * @nvec_used:	The number of vectors used
 * @dev:	Pointer to the device which uses this descriptor
 * @msg:	The last set MSI message cached for reuse
 * @affinity:	Optional pointer to a cpu affinity mask for this descriptor
 *
 * @write_msi_msg:	Callback that may be called when the MSI message
 *			address or data changes
 * @write_msi_msg_data:	Data parameter for the callback.
 *
 * @masked:	[PCI MSI/X] Mask bits
 * @is_msix:	[PCI MSI/X] True if MSI-X
 * @multiple:	[PCI MSI/X] log2 num of messages allocated
 * @multi_cap:	[PCI MSI/X] log2 num of messages supported
 * @maskbit:	[PCI MSI/X] Mask-Pending bit supported?
 * @is_64:	[PCI MSI/X] Address size: 0=32bit 1=64bit
 * @entry_nr:	[PCI MSI/X] Entry which is described by this descriptor
 * @default_irq:[PCI MSI/X] The default pre-assigned non-MSI irq
 * @mask_pos:	[PCI MSI]   Mask register position
 * @mask_base:	[PCI MSI-X] Mask register base address
 * @platform:	[platform]  Platform device specific msi descriptor data
 * @fsl_mc:	[fsl-mc]    FSL MC device specific msi descriptor data
 * @inta:	[INTA]	    TISCI based INTA specific msi descriptor data
 */
struct msi_desc {
	/* Shared device/bus type independent data */
	struct list_head		list;
	unsigned int			irq;
	unsigned int			nvec_used;
	struct device			*dev;
	struct msi_msg			msg;
	struct irq_affinity_desc	*affinity;
#ifdef CONFIG_IRQ_MSI_IOMMU
	const void			*iommu_cookie;
#endif

	void (*write_msi_msg)(struct msi_desc *entry, void *data);
	void *write_msi_msg_data;

	union {
		/* PCI MSI/X specific data */
		struct {
			u32 masked;
			struct {
				u8	is_msix		: 1;
				u8	multiple	: 3;
				u8	multi_cap	: 3;
				u8	maskbit		: 1;
				u8	is_64		: 1;
				u8	is_virtual	: 1;
				u16	entry_nr;
				unsigned default_irq;
			} msi_attrib;
			union {
				u8	mask_pos;
				void __iomem *mask_base;
			};
		};

		/*
		 * Non PCI variants add their data structure here. New
		 * entries need to use a named structure. We want
		 * proper name spaces for this. The PCI part is
		 * anonymous for now as it would require an immediate
		 * tree wide cleanup.
		 */
		struct platform_msi_desc platform;
		struct fsl_mc_msi_desc fsl_mc;
		struct ti_sci_inta_msi_desc inta;
	};
};

/* Helpers to hide struct msi_desc implementation details */
#define msi_desc_to_dev(desc)		((desc)->dev)
#define dev_to_msi_list(dev)		(&(dev)->msi_list)
#define first_msi_entry(dev)		\
	list_first_entry(dev_to_msi_list((dev)), struct msi_desc, list)
#define for_each_msi_entry(desc, dev)	\
	list_for_each_entry((desc), dev_to_msi_list((dev)), list)
#define for_each_msi_entry_safe(desc, tmp, dev)	\
	list_for_each_entry_safe((desc), (tmp), dev_to_msi_list((dev)), list)

#ifdef CONFIG_IRQ_MSI_IOMMU
static inline const void *msi_desc_get_iommu_cookie(struct msi_desc *desc)
{
	return desc->iommu_cookie;
}

static inline void msi_desc_set_iommu_cookie(struct msi_desc *desc,
					     const void *iommu_cookie)
{
	desc->iommu_cookie = iommu_cookie;
}
#else
static inline const void *msi_desc_get_iommu_cookie(struct msi_desc *desc)
{
	return NULL;
}

static inline void msi_desc_set_iommu_cookie(struct msi_desc *desc,
					     const void *iommu_cookie)
{
}
#endif

#ifdef CONFIG_PCI_MSI
#define first_pci_msi_entry(pdev)	first_msi_entry(&(pdev)->dev)
#define for_each_pci_msi_entry(desc, pdev)	\
	for_each_msi_entry((desc), &(pdev)->dev)

struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc);
void *msi_desc_to_pci_sysdata(struct msi_desc *desc);
void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
#else /* CONFIG_PCI_MSI */
static inline void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
{
	return NULL;
}
static inline void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
{
}
#endif /* CONFIG_PCI_MSI */

struct msi_desc *alloc_msi_entry(struct device *dev, int nvec,
				 const struct irq_affinity_desc *affinity);
void free_msi_entry(struct msi_desc *entry);
void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg);
void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg);

u32 __pci_msix_desc_mask_irq(struct msi_desc *desc, u32 flag);
u32 __pci_msi_desc_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
void pci_msi_mask_irq(struct irq_data *data);
void pci_msi_unmask_irq(struct irq_data *data);

/*
 * The arch hooks to setup up msi irqs. Default functions are implemented
 * as weak symbols so that they /can/ be overriden by architecture specific
 * code if needed. These hooks must be enabled by the architecture or by
 * drivers which depend on them via msi_controller based MSI handling.
 *
 * If CONFIG_PCI_MSI_ARCH_FALLBACKS is not selected they are replaced by
 * stubs with warnings.
 */
#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
void arch_teardown_msi_irq(unsigned int irq);
int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
void arch_teardown_msi_irqs(struct pci_dev *dev);
void default_teardown_msi_irqs(struct pci_dev *dev);
#else
static inline int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
	WARN_ON_ONCE(1);
	return -ENODEV;
}

static inline void arch_teardown_msi_irqs(struct pci_dev *dev)
{
	WARN_ON_ONCE(1);
}
#endif

/*
 * The restore hooks are still available as they are useful even
 * for fully irq domain based setups. Courtesy to XEN/X86.
 */
void arch_restore_msi_irqs(struct pci_dev *dev);
void default_restore_msi_irqs(struct pci_dev *dev);

struct msi_controller {
	struct module *owner;
	struct device *dev;
	struct device_node *of_node;
	struct list_head list;

	int (*setup_irq)(struct msi_controller *chip, struct pci_dev *dev,
			 struct msi_desc *desc);
	int (*setup_irqs)(struct msi_controller *chip, struct pci_dev *dev,
			  int nvec, int type);
	void (*teardown_irq)(struct msi_controller *chip, unsigned int irq);
};

#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN

#include <linux/irqhandler.h>
#include <asm/msi.h>

struct irq_domain;
struct irq_domain_ops;
struct irq_chip;
struct device_node;
struct fwnode_handle;
struct msi_domain_info;

/**
 * struct msi_domain_ops - MSI interrupt domain callbacks
 * @get_hwirq:		Retrieve the resulting hw irq number
 * @msi_init:		Domain specific init function for MSI interrupts
 * @msi_free:		Domain specific function to free a MSI interrupts
 * @msi_check:		Callback for verification of the domain/info/dev data
 * @msi_prepare:	Prepare the allocation of the interrupts in the domain
 * @msi_finish:		Optional callback to finalize the allocation
 * @set_desc:		Set the msi descriptor for an interrupt
 * @handle_error:	Optional error handler if the allocation fails
 * @domain_alloc_irqs:	Optional function to override the default allocation
 *			function.
 * @domain_free_irqs:	Optional function to override the default free
 *			function.
 *
 * @get_hwirq, @msi_init and @msi_free are callbacks used by
 * msi_create_irq_domain() and related interfaces
 *
 * @msi_check, @msi_prepare, @msi_finish, @set_desc and @handle_error
 * are callbacks used by msi_domain_alloc_irqs() and related
 * interfaces which are based on msi_desc.
 *
 * @domain_alloc_irqs, @domain_free_irqs can be used to override the
 * default allocation/free functions (__msi_domain_alloc/free_irqs). This
 * is initially for a wrapper around XENs seperate MSI universe which can't
 * be wrapped into the regular irq domains concepts by mere mortals.  This
 * allows to universally use msi_domain_alloc/free_irqs without having to
 * special case XEN all over the place.
 *
 * Contrary to other operations @domain_alloc_irqs and @domain_free_irqs
 * are set to the default implementation if NULL and even when
 * MSI_FLAG_USE_DEF_DOM_OPS is not set to avoid breaking existing users and
 * because these callbacks are obviously mandatory.
 *
 * This is NOT meant to be abused, but it can be useful to build wrappers
 * for specialized MSI irq domains which need extra work before and after
 * calling __msi_domain_alloc_irqs()/__msi_domain_free_irqs().
 */
struct msi_domain_ops {
	irq_hw_number_t	(*get_hwirq)(struct msi_domain_info *info,
				     msi_alloc_info_t *arg);
	int		(*msi_init)(struct irq_domain *domain,
				    struct msi_domain_info *info,
				    unsigned int virq, irq_hw_number_t hwirq,
				    msi_alloc_info_t *arg);
	void		(*msi_free)(struct irq_domain *domain,
				    struct msi_domain_info *info,
				    unsigned int virq);
	int		(*msi_check)(struct irq_domain *domain,
				     struct msi_domain_info *info,
				     struct device *dev);
	int		(*msi_prepare)(struct irq_domain *domain,
				       struct device *dev, int nvec,
				       msi_alloc_info_t *arg);
	void		(*msi_finish)(msi_alloc_info_t *arg, int retval);
	void		(*set_desc)(msi_alloc_info_t *arg,
				    struct msi_desc *desc);
	int		(*handle_error)(struct irq_domain *domain,
					struct msi_desc *desc, int error);
	int		(*domain_alloc_irqs)(struct irq_domain *domain,
					     struct device *dev, int nvec);
	void		(*domain_free_irqs)(struct irq_domain *domain,
					    struct device *dev);
};

/**
 * struct msi_domain_info - MSI interrupt domain data
 * @flags:		Flags to decribe features and capabilities
 * @ops:		The callback data structure
 * @chip:		Optional: associated interrupt chip
 * @chip_data:		Optional: associated interrupt chip data
 * @handler:		Optional: associated interrupt flow handler
 * @handler_data:	Optional: associated interrupt flow handler data
 * @handler_name:	Optional: associated interrupt flow handler name
 * @data:		Optional: domain specific data
 */
struct msi_domain_info {
	u32			flags;
	struct msi_domain_ops	*ops;
	struct irq_chip		*chip;
	void			*chip_data;
	irq_flow_handler_t	handler;
	void			*handler_data;
	const char		*handler_name;
	void			*data;
};

/* Flags for msi_domain_info */
enum {
	/*
	 * Init non implemented ops callbacks with default MSI domain
	 * callbacks.
	 */
	MSI_FLAG_USE_DEF_DOM_OPS	= (1 << 0),
	/*
	 * Init non implemented chip callbacks with default MSI chip
	 * callbacks.
	 */
	MSI_FLAG_USE_DEF_CHIP_OPS	= (1 << 1),
	/* Support multiple PCI MSI interrupts */
	MSI_FLAG_MULTI_PCI_MSI		= (1 << 2),
	/* Support PCI MSIX interrupts */
	MSI_FLAG_PCI_MSIX		= (1 << 3),
	/* Needs early activate, required for PCI */
	MSI_FLAG_ACTIVATE_EARLY		= (1 << 4),
	/*
	 * Must reactivate when irq is started even when
	 * MSI_FLAG_ACTIVATE_EARLY has been set.
	 */
	MSI_FLAG_MUST_REACTIVATE	= (1 << 5),
	/* Is level-triggered capable, using two messages */
	MSI_FLAG_LEVEL_CAPABLE		= (1 << 6),
};

int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
			    bool force);

struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
					 struct msi_domain_info *info,
					 struct irq_domain *parent);
int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
			    int nvec);
int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
			  int nvec);
void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);

struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode,
						  struct msi_domain_info *info,
						  struct irq_domain *parent);
int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
				   irq_write_msi_msg_t write_msi_msg);
void platform_msi_domain_free_irqs(struct device *dev);

/* When an MSI domain is used as an intermediate domain */
int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
			    int nvec, msi_alloc_info_t *args);
int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
			     int virq, int nvec, msi_alloc_info_t *args);
struct irq_domain *
__platform_msi_create_device_domain(struct device *dev,
				    unsigned int nvec,
				    bool is_tree,
				    irq_write_msi_msg_t write_msi_msg,
				    const struct irq_domain_ops *ops,
				    void *host_data);

#define platform_msi_create_device_domain(dev, nvec, write, ops, data)	\
	__platform_msi_create_device_domain(dev, nvec, false, write, ops, data)
#define platform_msi_create_device_tree_domain(dev, nvec, write, ops, data) \
	__platform_msi_create_device_domain(dev, nvec, true, write, ops, data)

int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
			      unsigned int nr_irqs);
void platform_msi_domain_free(struct irq_domain *domain, unsigned int virq,
			      unsigned int nvec);
void *platform_msi_get_host_data(struct irq_domain *domain);
#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */

#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg);
struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
					     struct msi_domain_info *info,
					     struct irq_domain *parent);
int pci_msi_domain_check_cap(struct irq_domain *domain,
			     struct msi_domain_info *info, struct device *dev);
u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);
struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev);
bool pci_dev_has_special_msi_domain(struct pci_dev *pdev);
#else
static inline struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
{
	return NULL;
}
#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */

#endif /* LINUX_MSI_H */