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/*
* MSI hooks for standard x86 apic
*/
#include <linux/pci.h>
#include <linux/irq.h>
#include <asm/smp.h>
#include "msi.h"
/*
* Shifts for APIC-based data
*/
#define MSI_DATA_VECTOR_SHIFT 0
#define MSI_DATA_VECTOR(v) (((u8)v) << MSI_DATA_VECTOR_SHIFT)
#define MSI_DATA_DELIVERY_SHIFT 8
#define MSI_DATA_DELIVERY_FIXED (0 << MSI_DATA_DELIVERY_SHIFT)
#define MSI_DATA_DELIVERY_LOWPRI (1 << MSI_DATA_DELIVERY_SHIFT)
#define MSI_DATA_LEVEL_SHIFT 14
#define MSI_DATA_LEVEL_DEASSERT (0 << MSI_DATA_LEVEL_SHIFT)
#define MSI_DATA_LEVEL_ASSERT (1 << MSI_DATA_LEVEL_SHIFT)
#define MSI_DATA_TRIGGER_SHIFT 15
#define MSI_DATA_TRIGGER_EDGE (0 << MSI_DATA_TRIGGER_SHIFT)
#define MSI_DATA_TRIGGER_LEVEL (1 << MSI_DATA_TRIGGER_SHIFT)
/*
* Shift/mask fields for APIC-based bus address
*/
#define MSI_ADDR_HEADER 0xfee00000
#define MSI_ADDR_DESTID_MASK 0xfff0000f
#define MSI_ADDR_DESTID_CPU(cpu) ((cpu) << MSI_TARGET_CPU_SHIFT)
#define MSI_ADDR_DESTMODE_SHIFT 2
#define MSI_ADDR_DESTMODE_PHYS (0 << MSI_ADDR_DESTMODE_SHIFT)
#define MSI_ADDR_DESTMODE_LOGIC (1 << MSI_ADDR_DESTMODE_SHIFT)
#define MSI_ADDR_REDIRECTION_SHIFT 3
#define MSI_ADDR_REDIRECTION_CPU (0 << MSI_ADDR_REDIRECTION_SHIFT)
#define MSI_ADDR_REDIRECTION_LOWPRI (1 << MSI_ADDR_REDIRECTION_SHIFT)
static void
msi_target_apic(unsigned int irq, cpumask_t cpu_mask, struct msi_msg *msg)
{
u32 addr = msg->address_lo;
addr &= MSI_ADDR_DESTID_MASK;
addr |= MSI_ADDR_DESTID_CPU(cpu_physical_id(first_cpu(cpu_mask)));
msg->address_lo = addr;
}
static int
msi_setup_apic(struct pci_dev *pdev, /* unused in generic */
unsigned int irq,
struct msi_msg *msg)
{
unsigned long dest_phys_id;
unsigned int vector;
dest_phys_id = cpu_physical_id(first_cpu(cpu_online_map));
vector = irq;
msg->address_hi = 0;
msg->address_lo =
MSI_ADDR_HEADER |
MSI_ADDR_DESTMODE_PHYS |
MSI_ADDR_REDIRECTION_CPU |
MSI_ADDR_DESTID_CPU(dest_phys_id);
msg->data =
MSI_DATA_TRIGGER_EDGE |
MSI_DATA_LEVEL_ASSERT |
MSI_DATA_DELIVERY_FIXED |
MSI_DATA_VECTOR(vector);
return 0;
}
static void
msi_teardown_apic(unsigned int irq)
{
return; /* no-op */
}
/*
* Generic ops used on most IA archs/platforms. Set with msi_register()
*/
struct msi_ops msi_apic_ops = {
.needs_64bit_address = 0,
.setup = msi_setup_apic,
.teardown = msi_teardown_apic,
.target = msi_target_apic,
};
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