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[Qemu-ppc] [PATCH 21/21] openpic: Accelerate pending irq search
From: |
Alexander Graf |
Subject: |
[Qemu-ppc] [PATCH 21/21] openpic: Accelerate pending irq search |
Date: |
Thu, 13 Dec 2012 13:02:28 +0100 |
When we're done with one interrupt, we need to search for the next pending
interrupt in the queue. This search has grown quite big now that we have
more than 256 possible irq lines.
So let's memorize how many interrupts we have pending in our bitmaps, so
that we can always bail out in the usual case - the one where we're all done.
Signed-off-by: Alexander Graf <address@hidden>
---
hw/openpic.c | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/hw/openpic.c b/hw/openpic.c
index 25d5cd7..3cbcea8 100644
--- a/hw/openpic.c
+++ b/hw/openpic.c
@@ -169,6 +169,7 @@ typedef struct IRQ_queue_t {
uint32_t queue[BF_WIDTH(MAX_IRQ)];
int next;
int priority;
+ int pending; /* nr of pending bits in queue */
} IRQ_queue_t;
typedef struct IRQ_src_t {
@@ -251,11 +252,13 @@ static void openpic_irq_raise(OpenPICState *opp, int
n_CPU, IRQ_src_t *src);
static inline void IRQ_setbit(IRQ_queue_t *q, int n_IRQ)
{
+ q->pending++;
set_bit(q->queue, n_IRQ);
}
static inline void IRQ_resetbit(IRQ_queue_t *q, int n_IRQ)
{
+ q->pending--;
reset_bit(q->queue, n_IRQ);
}
@@ -271,6 +274,12 @@ static void IRQ_check(OpenPICState *opp, IRQ_queue_t *q)
next = -1;
priority = -1;
+
+ if (!q->pending) {
+ /* IRQ bitmap is empty */
+ goto out;
+ }
+
for (i = 0; i < opp->max_irq; i++) {
if (IRQ_testbit(q, i)) {
DPRINTF("IRQ_check: irq %d set ipvp_pr=%d pr=%d\n",
@@ -281,6 +290,8 @@ static void IRQ_check(OpenPICState *opp, IRQ_queue_t *q)
}
}
}
+
+out:
q->next = next;
q->priority = priority;
}
--
1.6.0.2
- [Qemu-ppc] [PATCH 05/21] openpic: Convert subregions to memory api, (continued)
- [Qemu-ppc] [PATCH 05/21] openpic: Convert subregions to memory api, Alexander Graf, 2012/12/13
- [Qemu-ppc] [PATCH 19/21] MSI-X: Fix endianness, Alexander Graf, 2012/12/13
- [Qemu-ppc] [PATCH 11/21] openpic: convert simple reg operations to builtin bitops, Alexander Graf, 2012/12/13
- [Qemu-ppc] [PATCH 10/21] openpic: remove unused type variable, Alexander Graf, 2012/12/13
- [Qemu-ppc] [PATCH 09/21] openpic: unify memory api subregions, Alexander Graf, 2012/12/13
- [Qemu-ppc] [PATCH 18/21] PPC: e500: Declare pci bridge as bridge, Alexander Graf, 2012/12/13
- [Qemu-ppc] [PATCH 15/21] openpic: make brr1 model specific, Alexander Graf, 2012/12/13
- [Qemu-ppc] [PATCH 03/21] openpic: update to proper memory api, Alexander Graf, 2012/12/13
- [Qemu-ppc] [PATCH 14/21] openpic: convert to qdev, Alexander Graf, 2012/12/13
- [Qemu-ppc] [PATCH 20/21] openpic: fix minor coding style issues, Alexander Graf, 2012/12/13
- [Qemu-ppc] [PATCH 21/21] openpic: Accelerate pending irq search,
Alexander Graf <=
- [Qemu-ppc] [PATCH 13/21] openpic: remove irq_out, Alexander Graf, 2012/12/13