Release 4.7 include/linux/msi.h

#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);
void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);


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;
};

/**
 * 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
 *
 * @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
 */

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;

	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;
				
__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;
	};
};

/* 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)

#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);
#else /* CONFIG_PCI_MSI */


static inline void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
{
	return NULL;
}
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#endif /* CONFIG_PCI_MSI */

struct msi_desc *alloc_msi_entry(struct device *dev);
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);
void pci_write_msi_msg(unsigned int irq, 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);

/* Conversion helpers. Should be removed after merging */


static inline void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
{
	__pci_write_msi_msg(entry, msg);
}
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static inline void write_msi_msg(int irq, struct msi_msg *msg)
{
	pci_write_msi_msg(irq, msg);
}
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static inline void mask_msi_irq(struct irq_data *data)
{
	pci_msi_mask_irq(data);
}
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static inline void unmask_msi_irq(struct irq_data *data)
{
	pci_msi_unmask_irq(data);
}

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/*
 * The arch hooks to setup up msi irqs. Those functions are
 * implemented as weak symbols so that they /can/ be overriden by
 * architecture specific code if needed.
 */
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 arch_restore_msi_irqs(struct pci_dev *dev);

void default_teardown_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
 *
 * @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.
 */

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);
};

/**
 * 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),
	/* Build identity map between hwirq and irq */
	
MSI_FLAG_IDENTITY_MAP		= (1 << 2),
	/* Support multiple PCI MSI interrupts */
	
MSI_FLAG_MULTI_PCI_MSI		= (1 << 3),
	/* Support PCI MSIX interrupts */
	
MSI_FLAG_PCI_MSIX		= (1 << 4),
};

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);
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,
				  irq_write_msi_msg_t write_msi_msg,
				  const struct irq_domain_ops *ops,
				  void *host_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_alloc_irqs(struct irq_domain *domain, struct pci_dev *dev,
			      int nvec, int type);
void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev);
struct irq_domain *pci_msi_create_default_irq_domain(struct fwnode_handle *fwnode,
		 struct msi_domain_info *info, struct irq_domain *parent);

irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
					  struct msi_desc *desc);
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);
#else


static inline struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
{
	return NULL;
}
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#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */

#endif /* LINUX_MSI_H */
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