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linux_dsm_epyc7002/include/linux/irqdomain.h
Lokesh Vutla 49b323157b soc: ti: Add MSI domain bus support for Interrupt Aggregator 
With the system coprocessor managing the range allocation of the
inputs to Interrupt Aggregator, it is difficult to represent
the device IRQs from DT.

The suggestion is to use MSI in such cases where devices wants
to allocate and group interrupts dynamically.

Create a MSI domain bus layer that allocates and frees MSIs for
a device.

APIs that are implemented:
- ti_sci_inta_msi_create_irq_domain() that creates a MSI domain
- ti_sci_inta_msi_domain_alloc_irqs() that creates MSIs for the
  specified device and resource.
- ti_sci_inta_msi_domain_free_irqs() frees the irqs attached to the device.
- ti_sci_inta_msi_get_virq() for getting the virq attached to a specific event.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2019-05-01 10:49:17 +01:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* irq_domain - IRQ translation domains
*
* Translation infrastructure between hw and linux irq numbers. This is
* helpful for interrupt controllers to implement mapping between hardware
* irq numbers and the Linux irq number space.
*
* irq_domains also have hooks for translating device tree or other
* firmware interrupt representations into a hardware irq number that
* can be mapped back to a Linux irq number without any extra platform
* support code.
*
* Interrupt controller "domain" data structure. This could be defined as a
* irq domain controller. That is, it handles the mapping between hardware
* and virtual interrupt numbers for a given interrupt domain. The domain
* structure is generally created by the PIC code for a given PIC instance
* (though a domain can cover more than one PIC if they have a flat number
* model). It's the domain callbacks that are responsible for setting the
* irq_chip on a given irq_desc after it's been mapped.
*
* The host code and data structures use a fwnode_handle pointer to
* identify the domain. In some cases, and in order to preserve source
* code compatibility, this fwnode pointer is "upgraded" to a DT
* device_node. For those firmware infrastructures that do not provide
* a unique identifier for an interrupt controller, the irq_domain
* code offers a fwnode allocator.
*/
#ifndef _LINUX_IRQDOMAIN_H
#define _LINUX_IRQDOMAIN_H
#include <linux/types.h>
#include <linux/irqhandler.h>
#include <linux/of.h>
#include <linux/mutex.h>
#include <linux/radix-tree.h>
struct device_node;
struct irq_domain;
struct of_device_id;
struct irq_chip;
struct irq_data;
struct cpumask;
struct seq_file;
struct irq_affinity_desc;
/* Number of irqs reserved for a legacy isa controller */
#define NUM_ISA_INTERRUPTS 16
#define IRQ_DOMAIN_IRQ_SPEC_PARAMS 16
/**
* struct irq_fwspec - generic IRQ specifier structure
*
* @fwnode: Pointer to a firmware-specific descriptor
* @param_count: Number of device-specific parameters
* @param: Device-specific parameters
*
* This structure, directly modeled after of_phandle_args, is used to
* pass a device-specific description of an interrupt.
*/
struct irq_fwspec {
struct fwnode_handle *fwnode;
int param_count;
u32 param[IRQ_DOMAIN_IRQ_SPEC_PARAMS];
};
/*
* Should several domains have the same device node, but serve
* different purposes (for example one domain is for PCI/MSI, and the
* other for wired IRQs), they can be distinguished using a
* bus-specific token. Most domains are expected to only carry
* DOMAIN_BUS_ANY.
*/
enum irq_domain_bus_token {
DOMAIN_BUS_ANY = 0,
DOMAIN_BUS_WIRED,
DOMAIN_BUS_GENERIC_MSI,
DOMAIN_BUS_PCI_MSI,
DOMAIN_BUS_PLATFORM_MSI,
DOMAIN_BUS_NEXUS,
DOMAIN_BUS_IPI,
DOMAIN_BUS_FSL_MC_MSI,
DOMAIN_BUS_TI_SCI_INTA_MSI,
};
/**
* struct irq_domain_ops - Methods for irq_domain objects
* @match: Match an interrupt controller device node to a host, returns
* 1 on a match
* @map: Create or update a mapping between a virtual irq number and a hw
* irq number. This is called only once for a given mapping.
* @unmap: Dispose of such a mapping
* @xlate: Given a device tree node and interrupt specifier, decode
* the hardware irq number and linux irq type value.
*
* Functions below are provided by the driver and called whenever a new mapping
* is created or an old mapping is disposed. The driver can then proceed to
* whatever internal data structures management is required. It also needs
* to setup the irq_desc when returning from map().
*/
struct irq_domain_ops {
int (*match)(struct irq_domain *d, struct device_node *node,
enum irq_domain_bus_token bus_token);
int (*select)(struct irq_domain *d, struct irq_fwspec *fwspec,
enum irq_domain_bus_token bus_token);
int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw);
void (*unmap)(struct irq_domain *d, unsigned int virq);
int (*xlate)(struct irq_domain *d, struct device_node *node,
const u32 *intspec, unsigned int intsize,
unsigned long *out_hwirq, unsigned int *out_type);
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
/* extended V2 interfaces to support hierarchy irq_domains */
int (*alloc)(struct irq_domain *d, unsigned int virq,
unsigned int nr_irqs, void *arg);
void (*free)(struct irq_domain *d, unsigned int virq,
unsigned int nr_irqs);
int (*activate)(struct irq_domain *d, struct irq_data *irqd, bool reserve);
void (*deactivate)(struct irq_domain *d, struct irq_data *irq_data);
int (*translate)(struct irq_domain *d, struct irq_fwspec *fwspec,
unsigned long *out_hwirq, unsigned int *out_type);
#endif
#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
void (*debug_show)(struct seq_file *m, struct irq_domain *d,
struct irq_data *irqd, int ind);
#endif
};
extern struct irq_domain_ops irq_generic_chip_ops;
struct irq_domain_chip_generic;
/**
* struct irq_domain - Hardware interrupt number translation object
* @link: Element in global irq_domain list.
* @name: Name of interrupt domain
* @ops: pointer to irq_domain methods
* @host_data: private data pointer for use by owner. Not touched by irq_domain
* core code.
* @flags: host per irq_domain flags
* @mapcount: The number of mapped interrupts
*
* Optional elements
* @fwnode: Pointer to firmware node associated with the irq_domain. Pretty easy
* to swap it for the of_node via the irq_domain_get_of_node accessor
* @gc: Pointer to a list of generic chips. There is a helper function for
* setting up one or more generic chips for interrupt controllers
* drivers using the generic chip library which uses this pointer.
* @parent: Pointer to parent irq_domain to support hierarchy irq_domains
* @debugfs_file: dentry for the domain debugfs file
*
* Revmap data, used internally by irq_domain
* @revmap_direct_max_irq: The largest hwirq that can be set for controllers that
* support direct mapping
* @revmap_size: Size of the linear map table @linear_revmap[]
* @revmap_tree: Radix map tree for hwirqs that don't fit in the linear map
* @linear_revmap: Linear table of hwirq->virq reverse mappings
*/
struct irq_domain {
struct list_head link;
const char *name;
const struct irq_domain_ops *ops;
void *host_data;
unsigned int flags;
unsigned int mapcount;
/* Optional data */
struct fwnode_handle *fwnode;
enum irq_domain_bus_token bus_token;
struct irq_domain_chip_generic *gc;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
struct irq_domain *parent;
#endif
#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
struct dentry *debugfs_file;
#endif
/* reverse map data. The linear map gets appended to the irq_domain */
irq_hw_number_t hwirq_max;
unsigned int revmap_direct_max_irq;
unsigned int revmap_size;
struct radix_tree_root revmap_tree;
struct mutex revmap_tree_mutex;
unsigned int linear_revmap[];
};
/* Irq domain flags */
enum {
/* Irq domain is hierarchical */
IRQ_DOMAIN_FLAG_HIERARCHY = (1 << 0),
/* Irq domain name was allocated in __irq_domain_add() */
IRQ_DOMAIN_NAME_ALLOCATED = (1 << 6),
/* Irq domain is an IPI domain with virq per cpu */
IRQ_DOMAIN_FLAG_IPI_PER_CPU = (1 << 2),
/* Irq domain is an IPI domain with single virq */
IRQ_DOMAIN_FLAG_IPI_SINGLE = (1 << 3),
/* Irq domain implements MSIs */
IRQ_DOMAIN_FLAG_MSI = (1 << 4),
/* Irq domain implements MSI remapping */
IRQ_DOMAIN_FLAG_MSI_REMAP = (1 << 5),
/*
* Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
* for implementation specific purposes and ignored by the
* core code.
*/
IRQ_DOMAIN_FLAG_NONCORE = (1 << 16),
};
static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d)
{
return to_of_node(d->fwnode);
}
#ifdef CONFIG_IRQ_DOMAIN
struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
const char *name, void *data);
enum {
IRQCHIP_FWNODE_REAL,
IRQCHIP_FWNODE_NAMED,
IRQCHIP_FWNODE_NAMED_ID,
};
static inline
struct fwnode_handle *irq_domain_alloc_named_fwnode(const char *name)
{
return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_NAMED, 0, name, NULL);
}
static inline
struct fwnode_handle *irq_domain_alloc_named_id_fwnode(const char *name, int id)
{
return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_NAMED_ID, id, name,
NULL);
}
static inline struct fwnode_handle *irq_domain_alloc_fwnode(void *data)
{
return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_REAL, 0, NULL, data);
}
void irq_domain_free_fwnode(struct fwnode_handle *fwnode);
struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
irq_hw_number_t hwirq_max, int direct_max,
const struct irq_domain_ops *ops,
void *host_data);
struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
unsigned int size,
unsigned int first_irq,
const struct irq_domain_ops *ops,
void *host_data);
struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
unsigned int size,
unsigned int first_irq,
irq_hw_number_t first_hwirq,
const struct irq_domain_ops *ops,
void *host_data);
extern struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
enum irq_domain_bus_token bus_token);
extern bool irq_domain_check_msi_remap(void);
extern void irq_set_default_host(struct irq_domain *host);
extern struct irq_domain *irq_get_default_host(void);
extern int irq_domain_alloc_descs(int virq, unsigned int nr_irqs,
irq_hw_number_t hwirq, int node,
const struct irq_affinity_desc *affinity);
static inline struct fwnode_handle *of_node_to_fwnode(struct device_node *node)
{
return node ? &node->fwnode : NULL;
}
extern const struct fwnode_operations irqchip_fwnode_ops;
static inline bool is_fwnode_irqchip(struct fwnode_handle *fwnode)
{
return fwnode && fwnode->ops == &irqchip_fwnode_ops;
}
extern void irq_domain_update_bus_token(struct irq_domain *domain,
enum irq_domain_bus_token bus_token);
static inline
struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode,
enum irq_domain_bus_token bus_token)
{
struct irq_fwspec fwspec = {
.fwnode = fwnode,
};
return irq_find_matching_fwspec(&fwspec, bus_token);
}
static inline struct irq_domain *irq_find_matching_host(struct device_node *node,
enum irq_domain_bus_token bus_token)
{
return irq_find_matching_fwnode(of_node_to_fwnode(node), bus_token);
}
static inline struct irq_domain *irq_find_host(struct device_node *node)
{
struct irq_domain *d;
d = irq_find_matching_host(node, DOMAIN_BUS_WIRED);
if (!d)
d = irq_find_matching_host(node, DOMAIN_BUS_ANY);
return d;
}
/**
* irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
* @of_node: pointer to interrupt controller's device tree node.
* @size: Number of interrupts in the domain.
* @ops: map/unmap domain callbacks
* @host_data: Controller private data pointer
*/
static inline struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
unsigned int size,
const struct irq_domain_ops *ops,
void *host_data)
{
return __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data);
}
static inline struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
unsigned int max_irq,
const struct irq_domain_ops *ops,
void *host_data)
{
return __irq_domain_add(of_node_to_fwnode(of_node), 0, max_irq, max_irq, ops, host_data);
}
static inline struct irq_domain *irq_domain_add_legacy_isa(
struct device_node *of_node,
const struct irq_domain_ops *ops,
void *host_data)
{
return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops,
host_data);
}
static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
const struct irq_domain_ops *ops,
void *host_data)
{
return __irq_domain_add(of_node_to_fwnode(of_node), 0, ~0, 0, ops, host_data);
}
static inline struct irq_domain *irq_domain_create_linear(struct fwnode_handle *fwnode,
unsigned int size,
const struct irq_domain_ops *ops,
void *host_data)
{
return __irq_domain_add(fwnode, size, size, 0, ops, host_data);
}
static inline struct irq_domain *irq_domain_create_tree(struct fwnode_handle *fwnode,
const struct irq_domain_ops *ops,
void *host_data)
{
return __irq_domain_add(fwnode, 0, ~0, 0, ops, host_data);
}
extern void irq_domain_remove(struct irq_domain *host);
extern int irq_domain_associate(struct irq_domain *domain, unsigned int irq,
irq_hw_number_t hwirq);
extern void irq_domain_associate_many(struct irq_domain *domain,
unsigned int irq_base,
irq_hw_number_t hwirq_base, int count);
extern void irq_domain_disassociate(struct irq_domain *domain,
unsigned int irq);
extern unsigned int irq_create_mapping(struct irq_domain *host,
irq_hw_number_t hwirq);
extern unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec);
extern void irq_dispose_mapping(unsigned int virq);
/**
* irq_linear_revmap() - Find a linux irq from a hw irq number.
* @domain: domain owning this hardware interrupt
* @hwirq: hardware irq number in that domain space
*
* This is a fast path alternative to irq_find_mapping() that can be
* called directly by irq controller code to save a handful of
* instructions. It is always safe to call, but won't find irqs mapped
* using the radix tree.
*/
static inline unsigned int irq_linear_revmap(struct irq_domain *domain,
irq_hw_number_t hwirq)
{
return hwirq < domain->revmap_size ? domain->linear_revmap[hwirq] : 0;
}
extern unsigned int irq_find_mapping(struct irq_domain *host,
irq_hw_number_t hwirq);
extern unsigned int irq_create_direct_mapping(struct irq_domain *host);
extern int irq_create_strict_mappings(struct irq_domain *domain,
unsigned int irq_base,
irq_hw_number_t hwirq_base, int count);
static inline int irq_create_identity_mapping(struct irq_domain *host,
irq_hw_number_t hwirq)
{
return irq_create_strict_mappings(host, hwirq, hwirq, 1);
}
extern const struct irq_domain_ops irq_domain_simple_ops;
/* stock xlate functions */
int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
const u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq, unsigned int *out_type);
int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
const u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq, unsigned int *out_type);
int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr,
const u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq, unsigned int *out_type);
int irq_domain_translate_twocell(struct irq_domain *d,
struct irq_fwspec *fwspec,
unsigned long *out_hwirq,
unsigned int *out_type);
/* IPI functions */
int irq_reserve_ipi(struct irq_domain *domain, const struct cpumask *dest);
int irq_destroy_ipi(unsigned int irq, const struct cpumask *dest);
/* V2 interfaces to support hierarchy IRQ domains. */
extern struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
unsigned int virq);
extern void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hwirq, struct irq_chip *chip,
void *chip_data, irq_flow_handler_t handler,
void *handler_data, const char *handler_name);
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
extern struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
unsigned int flags, unsigned int size,
struct fwnode_handle *fwnode,
const struct irq_domain_ops *ops, void *host_data);
static inline struct irq_domain *irq_domain_add_hierarchy(struct irq_domain *parent,
unsigned int flags,
unsigned int size,
struct device_node *node,
const struct irq_domain_ops *ops,
void *host_data)
{
return irq_domain_create_hierarchy(parent, flags, size,
of_node_to_fwnode(node),
ops, host_data);
}
extern int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
unsigned int nr_irqs, int node, void *arg,
bool realloc,
const struct irq_affinity_desc *affinity);
extern void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs);
extern int irq_domain_activate_irq(struct irq_data *irq_data, bool early);
extern void irq_domain_deactivate_irq(struct irq_data *irq_data);
static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
unsigned int nr_irqs, int node, void *arg)
{
return __irq_domain_alloc_irqs(domain, -1, nr_irqs, node, arg, false,
NULL);
}
extern int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
unsigned int irq_base,
unsigned int nr_irqs, void *arg);
extern int irq_domain_set_hwirq_and_chip(struct irq_domain *domain,
unsigned int virq,
irq_hw_number_t hwirq,
struct irq_chip *chip,
void *chip_data);
extern void irq_domain_reset_irq_data(struct irq_data *irq_data);
extern void irq_domain_free_irqs_common(struct irq_domain *domain,
unsigned int virq,
unsigned int nr_irqs);
extern void irq_domain_free_irqs_top(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs);
extern int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg);
extern int irq_domain_pop_irq(struct irq_domain *domain, int virq);
extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
unsigned int irq_base,
unsigned int nr_irqs, void *arg);
extern void irq_domain_free_irqs_parent(struct irq_domain *domain,
unsigned int irq_base,
unsigned int nr_irqs);
static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
{
return domain->flags & IRQ_DOMAIN_FLAG_HIERARCHY;
}
static inline bool irq_domain_is_ipi(struct irq_domain *domain)
{
return domain->flags &
(IRQ_DOMAIN_FLAG_IPI_PER_CPU | IRQ_DOMAIN_FLAG_IPI_SINGLE);
}
static inline bool irq_domain_is_ipi_per_cpu(struct irq_domain *domain)
{
return domain->flags & IRQ_DOMAIN_FLAG_IPI_PER_CPU;
}
static inline bool irq_domain_is_ipi_single(struct irq_domain *domain)
{
return domain->flags & IRQ_DOMAIN_FLAG_IPI_SINGLE;
}
static inline bool irq_domain_is_msi(struct irq_domain *domain)
{
return domain->flags & IRQ_DOMAIN_FLAG_MSI;
}
static inline bool irq_domain_is_msi_remap(struct irq_domain *domain)
{
return domain->flags & IRQ_DOMAIN_FLAG_MSI_REMAP;
}
extern bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain);
#else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
unsigned int nr_irqs, int node, void *arg)
{
return -1;
}
static inline void irq_domain_free_irqs(unsigned int virq,
unsigned int nr_irqs) { }
static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
{
return false;
}
static inline bool irq_domain_is_ipi(struct irq_domain *domain)
{
return false;
}
static inline bool irq_domain_is_ipi_per_cpu(struct irq_domain *domain)
{
return false;
}
static inline bool irq_domain_is_ipi_single(struct irq_domain *domain)
{
return false;
}
static inline bool irq_domain_is_msi(struct irq_domain *domain)
{
return false;
}
static inline bool irq_domain_is_msi_remap(struct irq_domain *domain)
{
return false;
}
static inline bool
irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain)
{
return false;
}
#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
#else /* CONFIG_IRQ_DOMAIN */
static inline void irq_dispose_mapping(unsigned int virq) { }
static inline struct irq_domain *irq_find_matching_fwnode(
struct fwnode_handle *fwnode, enum irq_domain_bus_token bus_token)
{
return NULL;
}
static inline bool irq_domain_check_msi_remap(void)
{
return false;
}
#endif /* !CONFIG_IRQ_DOMAIN */
#endif /* _LINUX_IRQDOMAIN_H */
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