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genirq/msi: Allow shadow declarations of msi_msg:: $member 

Architectures like x86 have their MSI messages in various bits of the data,
address_lo and address_hi field. Composing or decomposing these messages
with bitmasks and shifts is possible, but unreadable gunk.

Allow architectures to provide an architecture specific representation for
each member of msi_msg. Provide empty defaults for each and stick them into
an union.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201024213535.443185-12-dwmw2@infradead.org
This commit is contained in:
Thomas Gleixner 2020-10-24 22:35:11 +01:00
parent 3d7295eb30
commit 8073c1ac82
2 changed files with 46 additions and 4 deletions
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4
include/asm-generic/msi.h
View File

@ -4,6 +4,8 @@
#include <linux/types.h>
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
#ifndef NUM_MSI_ALLOC_SCRATCHPAD_REGS
# define NUM_MSI_ALLOC_SCRATCHPAD_REGS 2
#endif
@ -30,4 +32,6 @@ typedef struct msi_alloc_info {
#define GENERIC_MSI_DOMAIN_OPS 1
#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
#endif

46
include/linux/msi.h
View File

@ -4,11 +4,50 @@
#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 {
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 */
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;
@ -243,7 +282,6 @@ struct msi_controller {
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
#include <linux/irqhandler.h>
#include <asm/msi.h>
struct irq_domain;
struct irq_domain_ops;