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ioapic: introduce ioapic_entry_parse() helper 

Abstract IOAPIC entry parsing logic into a helper function.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Peter Xu 2016-07-14 13:56:24 +08:00 committed by Michael S. Tsirkin
parent cb135f59b8
commit c15fa0bea9
1 changed files with 54 additions and 56 deletions
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110
hw/intc/ioapic.c
View File

@ -50,18 +50,56 @@ static IOAPICCommonState *ioapics[MAX_IOAPICS];
/* global variable from ioapic_common.c */
extern int ioapic_no;
struct ioapic_entry_info {
/* fields parsed from IOAPIC entries */
uint8_t masked;
uint8_t trig_mode;
uint16_t dest_idx;
uint8_t dest_mode;
uint8_t delivery_mode;
uint8_t vector;
/* MSI message generated from above parsed fields */
uint32_t addr;
uint32_t data;
};
static void ioapic_entry_parse(uint64_t entry, struct ioapic_entry_info *info)
{
memset(info, 0, sizeof(*info));
info->masked = (entry >> IOAPIC_LVT_MASKED_SHIFT) & 1;
info->trig_mode = (entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1;
/*
* By default, this would be dest_id[8] + reserved[8]. When IR
* is enabled, this would be interrupt_index[15] +
* interrupt_format[1]. This field never means anything, but
* only used to generate corresponding MSI.
*/
info->dest_idx = (entry >> IOAPIC_LVT_DEST_IDX_SHIFT) & 0xffff;
info->dest_mode = (entry >> IOAPIC_LVT_DEST_MODE_SHIFT) & 1;
info->delivery_mode = (entry >> IOAPIC_LVT_DELIV_MODE_SHIFT) \
& IOAPIC_DM_MASK;
if (info->delivery_mode == IOAPIC_DM_EXTINT) {
info->vector = pic_read_irq(isa_pic);
} else {
info->vector = entry & IOAPIC_VECTOR_MASK;
}
info->addr = APIC_DEFAULT_ADDRESS | \
(info->dest_idx << MSI_ADDR_DEST_IDX_SHIFT) | \
(info->dest_mode << MSI_ADDR_DEST_MODE_SHIFT);
info->data = (info->vector << MSI_DATA_VECTOR_SHIFT) | \
(info->trig_mode << MSI_DATA_TRIGGER_SHIFT) | \
(info->delivery_mode << MSI_DATA_DELIVERY_MODE_SHIFT);
}
static void ioapic_service(IOAPICCommonState *s)
{
AddressSpace *ioapic_as = PC_MACHINE(qdev_get_machine())->ioapic_as;
uint32_t addr, data;
struct ioapic_entry_info info;
uint8_t i;
uint8_t trig_mode;
uint8_t vector;
uint8_t delivery_mode;
uint32_t mask;
uint64_t entry;
uint16_t dest_idx;
uint8_t dest_mode;
for (i = 0; i < IOAPIC_NUM_PINS; i++) {
mask = 1 << i;
@ -69,33 +107,18 @@ static void ioapic_service(IOAPICCommonState *s)
int coalesce = 0;
entry = s->ioredtbl[i];
if (!(entry & IOAPIC_LVT_MASKED)) {
trig_mode = ((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1);
/*
* By default, this would be dest_id[8] +
* reserved[8]. When IR is enabled, this would be
* interrupt_index[15] + interrupt_format[1]. This
* field never means anything, but only used to
* generate corresponding MSI.
*/
dest_idx = entry >> IOAPIC_LVT_DEST_IDX_SHIFT;
dest_mode = (entry >> IOAPIC_LVT_DEST_MODE_SHIFT) & 1;
delivery_mode =
(entry >> IOAPIC_LVT_DELIV_MODE_SHIFT) & IOAPIC_DM_MASK;
if (trig_mode == IOAPIC_TRIGGER_EDGE) {
ioapic_entry_parse(entry, &info);
if (!info.masked) {
if (info.trig_mode == IOAPIC_TRIGGER_EDGE) {
s->irr &= ~mask;
} else {
coalesce = s->ioredtbl[i] & IOAPIC_LVT_REMOTE_IRR;
s->ioredtbl[i] |= IOAPIC_LVT_REMOTE_IRR;
}
if (delivery_mode == IOAPIC_DM_EXTINT) {
vector = pic_read_irq(isa_pic);
} else {
vector = entry & IOAPIC_VECTOR_MASK;
}
#ifdef CONFIG_KVM
if (kvm_irqchip_is_split()) {
if (trig_mode == IOAPIC_TRIGGER_EDGE) {
if (info.trig_mode == IOAPIC_TRIGGER_EDGE) {
kvm_set_irq(kvm_state, i, 1);
kvm_set_irq(kvm_state, i, 0);
} else {
@ -112,13 +135,7 @@ static void ioapic_service(IOAPICCommonState *s)
* the IOAPIC message into a MSI one, and its
* address space will decide whether we need a
* translation. */
addr = APIC_DEFAULT_ADDRESS | \
(dest_idx << MSI_ADDR_DEST_IDX_SHIFT) |
(dest_mode << MSI_ADDR_DEST_MODE_SHIFT);
data = (vector << MSI_DATA_VECTOR_SHIFT) |
(trig_mode << MSI_DATA_TRIGGER_SHIFT) |
(delivery_mode << MSI_DATA_DELIVERY_MODE_SHIFT);
stl_le_phys(ioapic_as, addr, data);
stl_le_phys(ioapic_as, info.addr, info.data);
}
}
}
@ -169,30 +186,11 @@ static void ioapic_update_kvm_routes(IOAPICCommonState *s)
if (kvm_irqchip_is_split()) {
for (i = 0; i < IOAPIC_NUM_PINS; i++) {
uint64_t entry = s->ioredtbl[i];
uint8_t trig_mode;
uint8_t delivery_mode;
uint8_t dest;
uint8_t dest_mode;
uint64_t pin_polarity;
MSIMessage msg;
trig_mode = ((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1);
dest = entry >> IOAPIC_LVT_DEST_SHIFT;
dest_mode = (entry >> IOAPIC_LVT_DEST_MODE_SHIFT) & 1;
pin_polarity = (entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1;
delivery_mode =
(entry >> IOAPIC_LVT_DELIV_MODE_SHIFT) & IOAPIC_DM_MASK;
msg.address = APIC_DEFAULT_ADDRESS;
msg.address |= dest_mode << 2;
msg.address |= dest << 12;
msg.data = entry & IOAPIC_VECTOR_MASK;
msg.data |= delivery_mode << APIC_DELIVERY_MODE_SHIFT;
msg.data |= pin_polarity << APIC_POLARITY_SHIFT;
msg.data |= trig_mode << APIC_TRIG_MODE_SHIFT;
struct ioapic_entry_info info;
ioapic_entry_parse(s->ioredtbl[i], &info);
msg.address = info.addr;
msg.data = info.data;
kvm_irqchip_update_msi_route(kvm_state, i, msg, NULL);
}
kvm_irqchip_commit_routes(kvm_state);