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hv: softirq: refine softirq

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1. add register_softirq to register a softirq handler
2. rename exec_softirq to do_softirq; raise_softirq to fire_softirq.
3. in do_softirq call registered softirq handler not call
the device softirq handle function directly
4. enable irq after vm exit and disable irq after the first
call do_softirq before vm enter.
5. call do_softirq again when irq disabled to handle the risk
unhandled softirq.
6. rename SOFTIRQ_DEV_ASSIGN to SOFTIRQ_PTDEV
7. remove SOFTIRQ_ATOMIC

Signed-off-by: Li, Fei1 <fei1.li@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Li, Fei1
2018-07-30 15:58:36 +08:00
committed by lijinxia
parent 073583cc41
commit 457ecd6ef7
8 changed files with 82 additions and 122 deletions
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103
hypervisor/common/softirq.c
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@@ -7,89 +7,42 @@
#include <hypervisor.h>
#include <softirq.h>
void disable_softirq(uint16_t cpu_id)
{
bitmap_clear_lock(SOFTIRQ_ATOMIC, &per_cpu(softirq_pending, cpu_id));
}
void enable_softirq(uint16_t cpu_id)
{
bitmap_set_lock(SOFTIRQ_ATOMIC, &per_cpu(softirq_pending, cpu_id));
}
static softirq_handler softirq_handlers[NR_SOFTIRQS];
void init_softirq(void)
{
uint16_t pcpu_id;
for (pcpu_id = 0U; pcpu_id < phys_cpu_num; pcpu_id++) {
per_cpu(softirq_pending, pcpu_id) = 0UL;
bitmap_set_lock(SOFTIRQ_ATOMIC, &per_cpu(softirq_pending, pcpu_id));
}
}
void raise_softirq(uint16_t softirq_id)
/*
* @pre: nr will not equal or large than NR_SOFTIRQS
*/
void register_softirq(uint16_t nr, softirq_handler handler)
{
uint16_t cpu_id = get_cpu_id();
uint64_t *bitmap = &per_cpu(softirq_pending, cpu_id);
if (cpu_id >= phys_cpu_num) {
return;
}
bitmap_set_lock(softirq_id, bitmap);
softirq_handlers[nr] = handler;
}
void exec_softirq(void)
/*
* @pre: nr will not equal or large than NR_SOFTIRQS
*/
void fire_softirq(uint16_t nr)
{
uint16_t cpu_id = get_cpu_id();
volatile uint64_t *bitmap = &per_cpu(softirq_pending, cpu_id);
uint16_t softirq_id;
if (cpu_id >= phys_cpu_num) {
return;
}
if (((*bitmap) & SOFTIRQ_MASK) == 0UL) {
return;
}
/* Disable softirq
* SOFTIRQ_ATOMIC bit = 0 means softirq already in execution
*/
if (!bitmap_test_and_clear_lock(SOFTIRQ_ATOMIC, bitmap)) {
return;
}
again:
CPU_IRQ_ENABLE();
while (1) {
softirq_id = ffs64(*bitmap);
if ((softirq_id == INVALID_BIT_INDEX) || (softirq_id >= SOFTIRQ_MAX)) {
break;
}
bitmap_clear_lock(softirq_id, bitmap);
switch (softirq_id) {
case SOFTIRQ_TIMER:
timer_softirq(cpu_id);
break;
case SOFTIRQ_DEV_ASSIGN:
ptdev_softirq(cpu_id);
break;
default:
break;
}
}
CPU_IRQ_DISABLE();
if (((*bitmap) & SOFTIRQ_MASK) != 0U) {
goto again;
}
enable_softirq(cpu_id);
bitmap_set_lock(nr, &per_cpu(softirq_pending, get_cpu_id()));
}
void do_softirq(void)
{
uint16_t nr;
uint16_t cpu_id = get_cpu_id();
volatile uint64_t *softirq_pending_bitmap =
&per_cpu(softirq_pending, cpu_id);
while (true) {
nr = ffs64(*softirq_pending_bitmap);
if (nr >= NR_SOFTIRQS)
break;
bitmap_clear_lock(nr, softirq_pending_bitmap);
(*softirq_handlers[nr])(cpu_id);
}
}