On 10/29/2010 12:56 PM, Alex Williamson wrote:
For device assignment, we need to know when the VM writes an end of interrupt to the APIC, which allows us to re-enable interrupts on the physical device. Add a new wrapper for ioapic generated interrupts with a callback on eoi and create an interface for drivers to be notified on eoi. Signed-off-by: Alex Williamson<alex.williamson@xxxxxxxxxx> --- Note that the notifier and notifier_enabled eoi_client fields aren't used here yet. I'll send an RFC patch showing how we make use of these with the proposed KVM_EOI_EVENTFD patches. hw/apic.c | 18 ++++++++++++++++-- hw/apic.h | 4 ++++ hw/ioapic.c | 38 ++++++++++++++++++++++++++++++++++++-- hw/pc.h | 16 +++++++++++++++- 4 files changed, 71 insertions(+), 5 deletions(-) diff --git a/hw/apic.c b/hw/apic.c index 63d62c7..a24117b 100644 --- a/hw/apic.c +++ b/hw/apic.c @@ -22,6 +22,7 @@ #include "host-utils.h" #include "sysbus.h" #include "trace.h" +#include "pc.h" /* APIC Local Vector Table */ #define APIC_LVT_TIMER 0 @@ -103,6 +104,7 @@ struct APICState { int wait_for_sipi; }; +static uint8_t vector_to_gsi_map[256] = { 0xff }; static APICState *local_apics[MAX_APICS + 1]; static int apic_irq_delivered; @@ -292,6 +294,15 @@ void apic_deliver_irq(uint8_t dest, uint8_t dest_mode, trigger_mode); } +void apic_deliver_ioapic_irq(uint8_t dest, uint8_t dest_mode, + uint8_t delivery_mode, uint8_t vector_num, + uint8_t polarity, uint8_t trigger_mode, int gsi) +{ + vector_to_gsi_map[vector_num] = gsi; + apic_deliver_irq(dest, dest_mode, delivery_mode, + vector_num, polarity, trigger_mode); +} + void cpu_set_apic_base(DeviceState *d, uint64_t val) { APICState *s = DO_UPCAST(APICState, busdev.qdev, d); @@ -420,8 +431,11 @@ static void apic_eoi(APICState *s) if (isrv< 0) return; reset_bit(s->isr, isrv); - /* XXX: send the EOI packet to the APIC bus to allow the I/O APIC to - set the remote IRR bit for level triggered interrupts. */ + + if (vector_to_gsi_map[isrv] != 0xff) { + ioapic_eoi(vector_to_gsi_map[isrv]); + vector_to_gsi_map[isrv] = 0xff; + } apic_update_irq(s); } diff --git a/hw/apic.h b/hw/apic.h index 8a0c9d0..59d0e37 100644 --- a/hw/apic.h +++ b/hw/apic.h @@ -8,6 +8,10 @@ void apic_deliver_irq(uint8_t dest, uint8_t dest_mode, uint8_t delivery_mode, uint8_t vector_num, uint8_t polarity, uint8_t trigger_mode); +void apic_deliver_ioapic_irq(uint8_t dest, uint8_t dest_mode, + uint8_t delivery_mode, + uint8_t vector_num, uint8_t polarity, + uint8_t trigger_mode, int gsi); int apic_accept_pic_intr(DeviceState *s); void apic_deliver_pic_intr(DeviceState *s, int level); int apic_get_interrupt(DeviceState *s); diff --git a/hw/ioapic.c b/hw/ioapic.c index 5ae21e9..ffd1c92 100644 --- a/hw/ioapic.c +++ b/hw/ioapic.c @@ -26,6 +26,7 @@ #include "qemu-timer.h" #include "host-utils.h" #include "sysbus.h" +#include "qlist.h" //#define DEBUG_IOAPIC @@ -61,6 +62,39 @@ struct IOAPICState { uint64_t ioredtbl[IOAPIC_NUM_PINS]; }; +static QLIST_HEAD(ioapic_eoi_client_list, + ioapic_eoi_client) ioapic_eoi_client_list = + QLIST_HEAD_INITIALIZER(ioapic_eoi_client_list); + +int ioapic_register_eoi_client(ioapic_eoi_client *client) +{ + QLIST_INSERT_HEAD(&ioapic_eoi_client_list, client, list); + return 0; +} + +void ioapic_unregister_eoi_client(ioapic_eoi_client *client) +{ + QLIST_REMOVE(client, list); +} + +int ioapic_eoi_client_get_fd(ioapic_eoi_client *client) +{ + if (!client->notifier_enabled) { + return -ENODEV; + } + return event_notifier_get_fd(&client->notifier); +} + +void ioapic_eoi(int gsi) +{ + ioapic_eoi_client *client; + QLIST_FOREACH(client,&ioapic_eoi_client_list, list) { + if (client->irq == gsi) { + client->eoi(client); + } + } +}
I think this all goes away with a NotifierList. Regards, Anthony Liguori
+ static void ioapic_service(IOAPICState *s) { uint8_t i; @@ -90,8 +124,8 @@ static void ioapic_service(IOAPICState *s) else vector = entry& 0xff; - apic_deliver_irq(dest, dest_mode, delivery_mode, - vector, polarity, trig_mode); + apic_deliver_ioapic_irq(dest, dest_mode, delivery_mode, + vector, polarity, trig_mode, i); } } } diff --git a/hw/pc.h b/hw/pc.h index 63b0249..5945bff 100644 --- a/hw/pc.h +++ b/hw/pc.h @@ -5,6 +5,7 @@ #include "ioport.h" #include "isa.h" #include "fdc.h" +#include "event_notifier.h" /* PC-style peripherals (also used by other machines). */ @@ -48,8 +49,21 @@ typedef struct isa_irq_state { void isa_irq_handler(void *opaque, int n, int level); -/* i8254.c */ +struct ioapic_eoi_client; +typedef struct ioapic_eoi_client ioapic_eoi_client; +struct ioapic_eoi_client { + void (*eoi)(struct ioapic_eoi_client *client); + int irq; + EventNotifier notifier; + QLIST_ENTRY(ioapic_eoi_client) list; + bool notifier_enabled; +}; +int ioapic_register_eoi_client(ioapic_eoi_client *client); +void ioapic_unregister_eoi_client(ioapic_eoi_client *client); +int ioapic_eoi_client_get_fd(ioapic_eoi_client *client); +void ioapic_eoi(int gsi); +/* i8254.c */ #define PIT_FREQ 1193182 typedef struct PITState PITState;
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