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[Qemu-ppc] [PATCH 32/40] openpic: Accelerate pending irq search
From: |
Alexander Graf |
Subject: |
[Qemu-ppc] [PATCH 32/40] openpic: Accelerate pending irq search |
Date: |
Fri, 14 Dec 2012 13:13:48 +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 16/40] openpic: Convert subregions to memory api, (continued)
- [Qemu-ppc] [PATCH 16/40] openpic: Convert subregions to memory api, Alexander Graf, 2012/12/14
- [Qemu-ppc] [PATCH 07/40] pseries: Implement PAPR NVRAM, Alexander Graf, 2012/12/14
- [Qemu-ppc] [PATCH 31/40] openpic: fix minor coding style issues, Alexander Graf, 2012/12/14
- [Qemu-ppc] [PATCH 15/40] openpic: combine mpic and openpic src handlers, Alexander Graf, 2012/12/14
- [Qemu-ppc] [PATCH 06/40] pseries: Split xics irq configuration from state information, Alexander Graf, 2012/12/14
- [Qemu-ppc] [PATCH 37/40] PPC: E500plat: Make a lot of PCI slots available, Alexander Graf, 2012/12/14
- [Qemu-ppc] [PATCH 12/40] openpic: Remove unused code, Alexander Graf, 2012/12/14
- [Qemu-ppc] [PATCH 29/40] PPC: e500: Declare pci bridge as bridge, Alexander Graf, 2012/12/14
- [Qemu-ppc] [PATCH 39/40] target-ppc: Don't use hwaddr to represent hardware state, Alexander Graf, 2012/12/14
- [Qemu-ppc] [PATCH 03/40] pseries: Return the token when we register an RTAS call, Alexander Graf, 2012/12/14
- [Qemu-ppc] [PATCH 32/40] openpic: Accelerate pending irq search,
Alexander Graf <=
- [Qemu-ppc] [PATCH 17/40] openpic: combine mpic and openpic irq raise functions, Alexander Graf, 2012/12/14
- [Qemu-ppc] [PATCH 01/40] pseries: Fix incorrect initialization of interrupt controller, Alexander Graf, 2012/12/14
- [Qemu-ppc] [PATCH 33/40] PPC: E500: PCI: Make first slot qdev settable, Alexander Graf, 2012/12/14
- [Qemu-ppc] [PATCH 05/40] pseries: Add tracepoints to the XICS interrupt controller, Alexander Graf, 2012/12/14
- [Qemu-ppc] [PATCH 25/40] openpic: convert to qdev, Alexander Graf, 2012/12/14
- [Qemu-ppc] [PATCH 10/40] Adding BAR0 for e500 PCI controller, Alexander Graf, 2012/12/14