[mirror_ubuntu-jammy-kernel.git] / include / linux / msi.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef LINUX_MSI_H
#define LINUX_MSI_H

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

/* Dummy shadow structures if an architecture does not define them */
#ifndef arch_msi_msg_addr_lo
typedef struct arch_msi_msg_addr_lo {
	u32	address_lo;
} __attribute__ ((packed)) arch_msi_msg_addr_lo_t;
#endif

#ifndef arch_msi_msg_addr_hi
typedef struct arch_msi_msg_addr_hi {
	u32	address_hi;
} __attribute__ ((packed)) arch_msi_msg_addr_hi_t;
#endif

#ifndef arch_msi_msg_data
typedef struct arch_msi_msg_data {
	u32	data;
} __attribute__ ((packed)) arch_msi_msg_data_t;
#endif

/**
 * msi_msg - Representation of a MSI message
 * @address_lo:		Low 32 bits of msi message address
 * @arch_addrlo:	Architecture specific shadow of @address_lo
 * @address_hi:		High 32 bits of msi message address
 *			(only used when device supports it)
 * @arch_addrhi:	Architecture specific shadow of @address_hi
 * @data:		MSI message data (usually 16 bits)
 * @arch_data:		Architecture specific shadow of @data
 */
struct msi_msg {
	union {
		u32			address_lo;
		arch_msi_msg_addr_lo_t	arch_addr_lo;
	};
	union {
		u32			address_hi;
		arch_msi_msg_addr_hi_t	arch_addr_hi;
	};
	union {
		u32			data;
		arch_msi_msg_data_t	arch_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)
#define for_each_msi_vector(desc, __irq, dev)				\
	for_each_msi_entry((desc), (dev))				\
		if ((desc)->irq)					\
			for (__irq = (desc)->irq;			\
			     __irq < ((desc)->irq + (desc)->nvec_used);	\
			     __irq++)

#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>

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 */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
3b7d1921 EB	2	#ifndef LINUX_MSI_H
	3	#define LINUX_MSI_H
	4
b50cac55	5	#include <linux/kobject.h>
4aa9bc95	6	#include <linux/list.h>
8073c1ac TG	7	#include <asm/msi.h>
	8
	9	/* Dummy shadow structures if an architecture does not define them */
	10	#ifndef arch_msi_msg_addr_lo
	11	typedef struct arch_msi_msg_addr_lo {
	12	u32 address_lo;
	13	} __attribute__ ((packed)) arch_msi_msg_addr_lo_t;
	14	#endif
	15
	16	#ifndef arch_msi_msg_addr_hi
	17	typedef struct arch_msi_msg_addr_hi {
	18	u32 address_hi;
	19	} __attribute__ ((packed)) arch_msi_msg_addr_hi_t;
	20	#endif
	21
	22	#ifndef arch_msi_msg_data
	23	typedef struct arch_msi_msg_data {
	24	u32 data;
	25	} __attribute__ ((packed)) arch_msi_msg_data_t;
	26	#endif
4aa9bc95	27
8073c1ac TG	28	/**
	29	* msi_msg - Representation of a MSI message
	30	* @address_lo: Low 32 bits of msi message address
	31	* @arch_addrlo: Architecture specific shadow of @address_lo
	32	* @address_hi: High 32 bits of msi message address
	33	* (only used when device supports it)
	34	* @arch_addrhi: Architecture specific shadow of @address_hi
	35	* @data: MSI message data (usually 16 bits)
	36	* @arch_data: Architecture specific shadow of @data
	37	*/
3b7d1921	38	struct msi_msg {
8073c1ac TG	39	union {
	40	u32 address_lo;
	41	arch_msi_msg_addr_lo_t arch_addr_lo;
	42	};
	43	union {
	44	u32 address_hi;
	45	arch_msi_msg_addr_hi_t arch_addr_hi;
	46	};
	47	union {
	48	u32 data;
	49	arch_msi_msg_data_t arch_data;
	50	};
3b7d1921 EB	51	};
3b7d1921 EB	52
38737d82	53	extern int pci_msi_ignore_mask;
c54c1879	54	/* Helper functions */
1c9db525	55	struct irq_data;
39431acb	56	struct msi_desc;
25a98bd4	57	struct pci_dev;
c09fcc4b	58	struct platform_msi_priv_data;
2366d06e	59	void __get_cached_msi_msg(struct msi_desc entry, struct msi_msg msg);
2f44e29c	60	#ifdef CONFIG_GENERIC_MSI_IRQ
2366d06e	61	void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
2f44e29c AB	62	#else
	63	static inline void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
	64	{
	65	}
	66	#endif
891d4a48	67
c09fcc4b MZ	68	typedef void (irq_write_msi_msg_t)(struct msi_desc desc,
	69	struct msi_msg *msg);
	70
	71	/**
	72	* platform_msi_desc - Platform device specific msi descriptor data
	73	* @msi_priv_data: Pointer to platform private data
	74	* @msi_index: The index of the MSI descriptor for multi MSI
	75	*/
	76	struct platform_msi_desc {
	77	struct platform_msi_priv_data *msi_priv_data;
	78	u16 msi_index;
	79	};
	80
550308e4 GR	81	/**
	82	* fsl_mc_msi_desc - FSL-MC device specific msi descriptor data
	83	* @msi_index: The index of the MSI descriptor
	84	*/
	85	struct fsl_mc_msi_desc {
	86	u16 msi_index;
	87	};
	88
49b32315 LV	89	/**
	90	* ti_sci_inta_msi_desc - TISCI based INTA specific msi descriptor data
	91	* @dev_index: TISCI device index
	92	*/
	93	struct ti_sci_inta_msi_desc {
	94	u16 dev_index;
	95	};
	96
fc88419c JL	97	/**
	98	* struct msi_desc - Descriptor structure for MSI based interrupts
	99	* @list: List head for management
	100	* @irq: The base interrupt number
	101	* @nvec_used: The number of vectors used
	102	* @dev: Pointer to the device which uses this descriptor
	103	* @msg: The last set MSI message cached for reuse
0972fa57	104	* @affinity: Optional pointer to a cpu affinity mask for this descriptor
fc88419c	105	*
d7cc609f LG	106	* @write_msi_msg: Callback that may be called when the MSI message
	107	* address or data changes
	108	* @write_msi_msg_data: Data parameter for the callback.
	109	*
fc88419c JL	110	* @masked: [PCI MSI/X] Mask bits
	111	* @is_msix: [PCI MSI/X] True if MSI-X
	112	* @multiple: [PCI MSI/X] log2 num of messages allocated
	113	* @multi_cap: [PCI MSI/X] log2 num of messages supported
	114	* @maskbit: [PCI MSI/X] Mask-Pending bit supported?
	115	* @is_64: [PCI MSI/X] Address size: 0=32bit 1=64bit
	116	* @entry_nr: [PCI MSI/X] Entry which is described by this descriptor
	117	* @default_irq:[PCI MSI/X] The default pre-assigned non-MSI irq
	118	* @mask_pos: [PCI MSI] Mask register position
	119	* @mask_base: [PCI MSI-X] Mask register base address
c09fcc4b	120	* @platform: [platform] Platform device specific msi descriptor data
87840fb5	121	* @fsl_mc: [fsl-mc] FSL MC device specific msi descriptor data
49b32315	122	* @inta: [INTA] TISCI based INTA specific msi descriptor data
fc88419c	123	*/
3b7d1921	124	struct msi_desc {
fc88419c JL	125	/* Shared device/bus type independent data */
	126	struct list_head list;
	127	unsigned int irq;
	128	unsigned int nvec_used;
	129	struct device *dev;
	130	struct msi_msg msg;
bec04037	131	struct irq_affinity_desc *affinity;
aaebdf8d JG	132	#ifdef CONFIG_IRQ_MSI_IOMMU
	133	const void *iommu_cookie;
	134	#endif
3b7d1921	135
d7cc609f LG	136	void (write_msi_msg)(struct msi_desc entry, void *data);
	137	void *write_msi_msg_data;
	138
264d9caa	139	union {
fc88419c JL	140	/* PCI MSI/X specific data */
	141	struct {
	142	u32 masked;
	143	struct {
ddd065e4 LG	144	u8 is_msix : 1;
	145	u8 multiple : 3;
	146	u8 multi_cap : 3;
	147	u8 maskbit : 1;
	148	u8 is_64 : 1;
d7cc609f	149	u8 is_virtual : 1;
ddd065e4	150	u16 entry_nr;
fc88419c JL	151	unsigned default_irq;
	152	} msi_attrib;
	153	union {
	154	u8 mask_pos;
	155	void __iomem *mask_base;
	156	};
	157	};
3b7d1921	158
fc88419c JL	159	/*
	160	* Non PCI variants add their data structure here. New
	161	* entries need to use a named structure. We want
	162	* proper name spaces for this. The PCI part is
	163	* anonymous for now as it would require an immediate
	164	* tree wide cleanup.
	165	*/
c09fcc4b	166	struct platform_msi_desc platform;
550308e4	167	struct fsl_mc_msi_desc fsl_mc;
49b32315	168	struct ti_sci_inta_msi_desc inta;
fc88419c	169	};
3b7d1921 EB	170	};
3b7d1921 EB	171
d31eb342	172	/* Helpers to hide struct msi_desc implementation details */
25a98bd4	173	#define msi_desc_to_dev(desc) ((desc)->dev)
4a7cc831	174	#define dev_to_msi_list(dev) (&(dev)->msi_list)
d31eb342 JL	175	#define first_msi_entry(dev) \
	176	list_first_entry(dev_to_msi_list((dev)), struct msi_desc, list)
	177	#define for_each_msi_entry(desc, dev) \
	178	list_for_each_entry((desc), dev_to_msi_list((dev)), list)
81b1e6e6 MR	179	#define for_each_msi_entry_safe(desc, tmp, dev) \
81b1e6e6 MR	180	list_for_each_entry_safe((desc), (tmp), dev_to_msi_list((dev)), list)
4c457e8c MZ	181	#define for_each_msi_vector(desc, __irq, dev) \
	182	for_each_msi_entry((desc), (dev)) \
	183	if ((desc)->irq) \
	184	for (__irq = (desc)->irq; \
	185	__irq < ((desc)->irq + (desc)->nvec_used); \
	186	__irq++)
d31eb342	187
aaebdf8d JG	188	#ifdef CONFIG_IRQ_MSI_IOMMU
	189	static inline const void msi_desc_get_iommu_cookie(struct msi_desc desc)
	190	{
	191	return desc->iommu_cookie;
	192	}
	193
	194	static inline void msi_desc_set_iommu_cookie(struct msi_desc *desc,
	195	const void *iommu_cookie)
	196	{
	197	desc->iommu_cookie = iommu_cookie;
	198	}
	199	#else
	200	static inline const void msi_desc_get_iommu_cookie(struct msi_desc desc)
	201	{
	202	return NULL;
	203	}
	204
	205	static inline void msi_desc_set_iommu_cookie(struct msi_desc *desc,
	206	const void *iommu_cookie)
	207	{
	208	}
	209	#endif
	210
d31eb342 JL	211	#ifdef CONFIG_PCI_MSI
	212	#define first_pci_msi_entry(pdev) first_msi_entry(&(pdev)->dev)
	213	#define for_each_pci_msi_entry(desc, pdev) \
	214	for_each_msi_entry((desc), &(pdev)->dev)
	215
25a98bd4	216	struct pci_dev msi_desc_to_pci_dev(struct msi_desc desc);
c179c9b9	217	void msi_desc_to_pci_sysdata(struct msi_desc desc);
2f44e29c	218	void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg);
c179c9b9 JL	219	#else /* CONFIG_PCI_MSI */
	220	static inline void msi_desc_to_pci_sysdata(struct msi_desc desc)
	221	{
	222	return NULL;
	223	}
2f44e29c AB	224	static inline void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
	225	{
	226	}
d31eb342 JL	227	#endif /* CONFIG_PCI_MSI */
d31eb342 JL	228
28f4b041	229	struct msi_desc alloc_msi_entry(struct device dev, int nvec,
bec04037	230	const struct irq_affinity_desc *affinity);
aa48b6f7	231	void free_msi_entry(struct msi_desc *entry);
891d4a48	232	void __pci_read_msi_msg(struct msi_desc entry, struct msi_msg msg);
83a18912	233	void __pci_write_msi_msg(struct msi_desc entry, struct msi_msg msg);
83a18912	234
23ed8d57 TG	235	u32 __pci_msix_desc_mask_irq(struct msi_desc *desc, u32 flag);
	236	u32 __pci_msi_desc_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
	237	void pci_msi_mask_irq(struct irq_data *data);
	238	void pci_msi_unmask_irq(struct irq_data *data);
	239
3b7d1921	240	/*
077ee78e TG	241	* The arch hooks to setup up msi irqs. Default functions are implemented
	242	* as weak symbols so that they /can/ be overriden by architecture specific
	243	* code if needed. These hooks must be enabled by the architecture or by
	244	* drivers which depend on them via msi_controller based MSI handling.
	245	*
	246	* If CONFIG_PCI_MSI_ARCH_FALLBACKS is not selected they are replaced by
	247	* stubs with warnings.
3b7d1921	248	*/
077ee78e	249	#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
f7feaca7	250	int arch_setup_msi_irq(struct pci_dev dev, struct msi_desc desc);
3b7d1921	251	void arch_teardown_msi_irq(unsigned int irq);
2366d06e BH	252	int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
2366d06e BH	253	void arch_teardown_msi_irqs(struct pci_dev *dev);
4287d824	254	void default_teardown_msi_irqs(struct pci_dev *dev);
077ee78e TG	255	#else
	256	static inline int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	257	{
	258	WARN_ON_ONCE(1);
	259	return -ENODEV;
	260	}
	261
	262	static inline void arch_teardown_msi_irqs(struct pci_dev *dev)
	263	{
	264	WARN_ON_ONCE(1);
	265	}
	266	#endif
	267
	268	/*
	269	* The restore hooks are still available as they are useful even
	270	* for fully irq domain based setups. Courtesy to XEN/X86.
	271	*/
	272	void arch_restore_msi_irqs(struct pci_dev *dev);
ac8344c4	273	void default_restore_msi_irqs(struct pci_dev *dev);
3b7d1921	274
c2791b80	275	struct msi_controller {
0cbdcfcf TR	276	struct module *owner;
0cbdcfcf TR	277	struct device *dev;
0d5a6db3 TP	278	struct device_node *of_node;
0d5a6db3 TP	279	struct list_head list;
0cbdcfcf	280
c2791b80	281	int (setup_irq)(struct msi_controller chip, struct pci_dev *dev,
0cbdcfcf	282	struct msi_desc *desc);
339e5b44 LS	283	int (setup_irqs)(struct msi_controller chip, struct pci_dev *dev,
339e5b44 LS	284	int nvec, int type);
c2791b80	285	void (teardown_irq)(struct msi_controller chip, unsigned int irq);
0cbdcfcf TR	286	};
0cbdcfcf TR	287
f3cf8bb0	288	#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
d9109698	289
aeeb5965	290	#include <linux/irqhandler.h>
d9109698	291
f3cf8bb0	292	struct irq_domain;
552c494a	293	struct irq_domain_ops;
f3cf8bb0 JL	294	struct irq_chip;
f3cf8bb0 JL	295	struct device_node;
be5436c8	296	struct fwnode_handle;
f3cf8bb0 JL	297	struct msi_domain_info;
	298
	299	/**
	300	* struct msi_domain_ops - MSI interrupt domain callbacks
	301	* @get_hwirq: Retrieve the resulting hw irq number
	302	* @msi_init: Domain specific init function for MSI interrupts
	303	* @msi_free: Domain specific function to free a MSI interrupts
d9109698 JL	304	* @msi_check: Callback for verification of the domain/info/dev data
d9109698 JL	305	* @msi_prepare: Prepare the allocation of the interrupts in the domain
1d1e8cdc	306	* @msi_finish: Optional callback to finalize the allocation
d9109698 JL	307	* @set_desc: Set the msi descriptor for an interrupt
d9109698 JL	308	* @handle_error: Optional error handler if the allocation fails
43e9e705 TG	309	* @domain_alloc_irqs: Optional function to override the default allocation
	310	* function.
	311	* @domain_free_irqs: Optional function to override the default free
	312	* function.
d9109698 JL	313	*
	314	* @get_hwirq, @msi_init and @msi_free are callbacks used by
	315	* msi_create_irq_domain() and related interfaces
	316	*
	317	* @msi_check, @msi_prepare, @msi_finish, @set_desc and @handle_error
1d1e8cdc	318	* are callbacks used by msi_domain_alloc_irqs() and related
d9109698	319	* interfaces which are based on msi_desc.
43e9e705 TG	320	*
	321	* @domain_alloc_irqs, @domain_free_irqs can be used to override the
	322	* default allocation/free functions (__msi_domain_alloc/free_irqs). This
	323	* is initially for a wrapper around XENs seperate MSI universe which can't
	324	* be wrapped into the regular irq domains concepts by mere mortals. This
	325	* allows to universally use msi_domain_alloc/free_irqs without having to
	326	* special case XEN all over the place.
	327	*
	328	* Contrary to other operations @domain_alloc_irqs and @domain_free_irqs
	329	* are set to the default implementation if NULL and even when
	330	* MSI_FLAG_USE_DEF_DOM_OPS is not set to avoid breaking existing users and
	331	* because these callbacks are obviously mandatory.
	332	*
	333	* This is NOT meant to be abused, but it can be useful to build wrappers
	334	* for specialized MSI irq domains which need extra work before and after
	335	* calling __msi_domain_alloc_irqs()/__msi_domain_free_irqs().
f3cf8bb0 JL	336	*/
f3cf8bb0 JL	337	struct msi_domain_ops {
aeeb5965 JL	338	irq_hw_number_t (get_hwirq)(struct msi_domain_info info,
aeeb5965 JL	339	msi_alloc_info_t *arg);
f3cf8bb0 JL	340	int (msi_init)(struct irq_domain domain,
	341	struct msi_domain_info *info,
	342	unsigned int virq, irq_hw_number_t hwirq,
aeeb5965	343	msi_alloc_info_t *arg);
f3cf8bb0 JL	344	void (msi_free)(struct irq_domain domain,
	345	struct msi_domain_info *info,
	346	unsigned int virq);
d9109698 JL	347	int (msi_check)(struct irq_domain domain,
	348	struct msi_domain_info *info,
	349	struct device *dev);
	350	int (msi_prepare)(struct irq_domain domain,
	351	struct device *dev, int nvec,
	352	msi_alloc_info_t *arg);
	353	void (msi_finish)(msi_alloc_info_t arg, int retval);
	354	void (set_desc)(msi_alloc_info_t arg,
	355	struct msi_desc *desc);
	356	int (handle_error)(struct irq_domain domain,
	357	struct msi_desc *desc, int error);
43e9e705 TG	358	int (domain_alloc_irqs)(struct irq_domain domain,
	359	struct device *dev, int nvec);
	360	void (domain_free_irqs)(struct irq_domain domain,
	361	struct device *dev);
f3cf8bb0 JL	362	};
	363
	364	/**
	365	* struct msi_domain_info - MSI interrupt domain data
aeeb5965 JL	366	* @flags: Flags to decribe features and capabilities
	367	* @ops: The callback data structure
	368	* @chip: Optional: associated interrupt chip
	369	* @chip_data: Optional: associated interrupt chip data
	370	* @handler: Optional: associated interrupt flow handler
	371	* @handler_data: Optional: associated interrupt flow handler data
	372	* @handler_name: Optional: associated interrupt flow handler name
	373	* @data: Optional: domain specific data
f3cf8bb0 JL	374	*/
f3cf8bb0 JL	375	struct msi_domain_info {
aeeb5965	376	u32 flags;
f3cf8bb0 JL	377	struct msi_domain_ops *ops;
f3cf8bb0 JL	378	struct irq_chip *chip;
aeeb5965 JL	379	void *chip_data;
	380	irq_flow_handler_t handler;
	381	void *handler_data;
	382	const char *handler_name;
f3cf8bb0 JL	383	void *data;
	384	};
	385
aeeb5965 JL	386	/* Flags for msi_domain_info */
	387	enum {
	388	/*
	389	* Init non implemented ops callbacks with default MSI domain
	390	* callbacks.
	391	*/
	392	MSI_FLAG_USE_DEF_DOM_OPS = (1 << 0),
	393	/*
	394	* Init non implemented chip callbacks with default MSI chip
	395	* callbacks.
	396	*/
	397	MSI_FLAG_USE_DEF_CHIP_OPS = (1 << 1),
aeeb5965	398	/* Support multiple PCI MSI interrupts */
b6140914	399	MSI_FLAG_MULTI_PCI_MSI = (1 << 2),
aeeb5965	400	/* Support PCI MSIX interrupts */
b6140914	401	MSI_FLAG_PCI_MSIX = (1 << 3),
f3b0946d MZ	402	/* Needs early activate, required for PCI */
f3b0946d MZ	403	MSI_FLAG_ACTIVATE_EARLY = (1 << 4),
22d0b12f TG	404	/*
	405	* Must reactivate when irq is started even when
	406	* MSI_FLAG_ACTIVATE_EARLY has been set.
	407	*/
	408	MSI_FLAG_MUST_REACTIVATE = (1 << 5),
0be8153c MZ	409	/* Is level-triggered capable, using two messages */
0be8153c MZ	410	MSI_FLAG_LEVEL_CAPABLE = (1 << 6),
aeeb5965 JL	411	};
aeeb5965 JL	412
f3cf8bb0 JL	413	int msi_domain_set_affinity(struct irq_data data, const struct cpumask mask,
	414	bool force);
	415
be5436c8	416	struct irq_domain msi_create_irq_domain(struct fwnode_handle fwnode,
f3cf8bb0 JL	417	struct msi_domain_info *info,
f3cf8bb0 JL	418	struct irq_domain *parent);
43e9e705 TG	419	int __msi_domain_alloc_irqs(struct irq_domain domain, struct device dev,
43e9e705 TG	420	int nvec);
d9109698 JL	421	int msi_domain_alloc_irqs(struct irq_domain domain, struct device dev,
d9109698 JL	422	int nvec);
43e9e705	423	void __msi_domain_free_irqs(struct irq_domain domain, struct device dev);
d9109698	424	void msi_domain_free_irqs(struct irq_domain domain, struct device dev);
f3cf8bb0 JL	425	struct msi_domain_info msi_get_domain_info(struct irq_domain domain);
f3cf8bb0 JL	426
be5436c8	427	struct irq_domain platform_msi_create_irq_domain(struct fwnode_handle fwnode,
c09fcc4b MZ	428	struct msi_domain_info *info,
	429	struct irq_domain *parent);
	430	int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
	431	irq_write_msi_msg_t write_msi_msg);
	432	void platform_msi_domain_free_irqs(struct device *dev);
b2eba39b MZ	433
	434	/* When an MSI domain is used as an intermediate domain */
	435	int msi_domain_prepare_irqs(struct irq_domain domain, struct device dev,
	436	int nvec, msi_alloc_info_t *args);
2145ac93 MZ	437	int msi_domain_populate_irqs(struct irq_domain domain, struct device dev,
2145ac93 MZ	438	int virq, int nvec, msi_alloc_info_t *args);
552c494a	439	struct irq_domain *
1f83515b MZ	440	__platform_msi_create_device_domain(struct device *dev,
	441	unsigned int nvec,
	442	bool is_tree,
	443	irq_write_msi_msg_t write_msi_msg,
	444	const struct irq_domain_ops *ops,
	445	void *host_data);
	446
	447	#define platform_msi_create_device_domain(dev, nvec, write, ops, data) \
	448	__platform_msi_create_device_domain(dev, nvec, false, write, ops, data)
	449	#define platform_msi_create_device_tree_domain(dev, nvec, write, ops, data) \
	450	__platform_msi_create_device_domain(dev, nvec, true, write, ops, data)
	451
552c494a MZ	452	int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
	453	unsigned int nr_irqs);
	454	void platform_msi_domain_free(struct irq_domain *domain, unsigned int virq,
	455	unsigned int nvec);
	456	void platform_msi_get_host_data(struct irq_domain domain);
f3cf8bb0 JL	457	#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
f3cf8bb0 JL	458
3878eaef JL	459	#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
3878eaef JL	460	void pci_msi_domain_write_msg(struct irq_data irq_data, struct msi_msg msg);
be5436c8	461	struct irq_domain pci_msi_create_irq_domain(struct fwnode_handle fwnode,
3878eaef JL	462	struct msi_domain_info *info,
3878eaef JL	463	struct irq_domain *parent);
3878eaef JL	464	int pci_msi_domain_check_cap(struct irq_domain *domain,
3878eaef JL	465	struct msi_domain_info info, struct device dev);
b6eec9b7	466	u32 pci_msi_domain_get_msi_rid(struct irq_domain domain, struct pci_dev pdev);
54fa97ee	467	struct irq_domain pci_msi_get_device_domain(struct pci_dev pdev);
2fd60266	468	bool pci_dev_has_special_msi_domain(struct pci_dev *pdev);
54fa97ee MZ	469	#else
	470	static inline struct irq_domain pci_msi_get_device_domain(struct pci_dev pdev)
	471	{
	472	return NULL;
	473	}
3878eaef JL	474	#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
3878eaef JL	475
3b7d1921	476	#endif /* LINUX_MSI_H */