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hw/intc: sifive_plic: Cleanup remaining functions 

We can remove the original sifive_plic_irqs_pending() function and
instead just use the sifive_plic_claim() function (renamed to
sifive_plic_claimed()) to determine if any interrupts are pending.

This requires move the side effects outside of sifive_plic_claimed(),
but as they are only invoked once that isn't a problem.

We have also removed all of the old #ifdef debugging logs, so let's
cleanup the last remaining debug function while we are here.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Message-Id: <20220105213937.1113508-5-alistair.francis@opensource.wdc.com>
This commit is contained in:
Alistair Francis 2022-01-06 07:39:33 +10:00
parent b79e1c76c0
commit 41bcc44a25
1 changed files with 22 additions and 87 deletions
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109
hw/intc/sifive_plic.c
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@ -31,8 +31,6 @@
#include "migration/vmstate.h"
#include "hw/irq.h"
#define RISCV_DEBUG_PLIC 0
static bool addr_between(uint32_t addr, uint32_t base, uint32_t num)
{
return addr >= base && addr - base < num;
@ -51,47 +49,6 @@ static PLICMode char_to_mode(char c)
}
}
static char mode_to_char(PLICMode m)
{
switch (m) {
case PLICMode_U: return 'U';
case PLICMode_S: return 'S';
case PLICMode_H: return 'H';
case PLICMode_M: return 'M';
default: return '?';
}
}
static void sifive_plic_print_state(SiFivePLICState *plic)
{
int i;
int addrid;
/* pending */
qemu_log("pending : ");
for (i = plic->bitfield_words - 1; i >= 0; i--) {
qemu_log("%08x", plic->pending[i]);
}
qemu_log("\n");
/* pending */
qemu_log("claimed : ");
for (i = plic->bitfield_words - 1; i >= 0; i--) {
qemu_log("%08x", plic->claimed[i]);
}
qemu_log("\n");
for (addrid = 0; addrid < plic->num_addrs; addrid++) {
qemu_log("hart%d-%c enable: ",
plic->addr_config[addrid].hartid,
mode_to_char(plic->addr_config[addrid].mode));
for (i = plic->bitfield_words - 1; i >= 0; i--) {
qemu_log("%08x", plic->enable[addrid * plic->bitfield_words + i]);
}
qemu_log("\n");
}
}
static uint32_t atomic_set_masked(uint32_t *a, uint32_t mask, uint32_t value)
{
uint32_t old, new, cmp = qatomic_read(a);
@ -115,26 +72,34 @@ static void sifive_plic_set_claimed(SiFivePLICState *plic, int irq, bool level)
atomic_set_masked(&plic->claimed[irq >> 5], 1 << (irq & 31), -!!level);
}
static int sifive_plic_irqs_pending(SiFivePLICState *plic, uint32_t addrid)
static uint32_t sifive_plic_claimed(SiFivePLICState *plic, uint32_t addrid)
{
uint32_t max_irq = 0;
uint32_t max_prio = plic->target_priority[addrid];
int i, j;
for (i = 0; i < plic->bitfield_words; i++) {
uint32_t pending_enabled_not_claimed =
(plic->pending[i] & ~plic->claimed[i]) &
plic->enable[addrid * plic->bitfield_words + i];
(plic->pending[i] & ~plic->claimed[i]) &
plic->enable[addrid * plic->bitfield_words + i];
if (!pending_enabled_not_claimed) {
continue;
}
for (j = 0; j < 32; j++) {
int irq = (i << 5) + j;
uint32_t prio = plic->source_priority[irq];
int enabled = pending_enabled_not_claimed & (1 << j);
if (enabled && prio > plic->target_priority[addrid]) {
return 1;
if (enabled && prio > max_prio) {
max_irq = irq;
max_prio = prio;
}
}
}
return 0;
return max_irq;
}
static void sifive_plic_update(SiFivePLICState *plic)
@ -145,7 +110,7 @@ static void sifive_plic_update(SiFivePLICState *plic)
for (addrid = 0; addrid < plic->num_addrs; addrid++) {
uint32_t hartid = plic->addr_config[addrid].hartid;
PLICMode mode = plic->addr_config[addrid].mode;
int level = sifive_plic_irqs_pending(plic, addrid);
bool level = !!sifive_plic_claimed(plic, addrid);
switch (mode) {
case PLICMode_M:
@ -158,41 +123,6 @@ static void sifive_plic_update(SiFivePLICState *plic)
break;
}
}
if (RISCV_DEBUG_PLIC) {
sifive_plic_print_state(plic);
}
}
static uint32_t sifive_plic_claim(SiFivePLICState *plic, uint32_t addrid)
{
int i, j;
uint32_t max_irq = 0;
uint32_t max_prio = plic->target_priority[addrid];
for (i = 0; i < plic->bitfield_words; i++) {
uint32_t pending_enabled_not_claimed =
(plic->pending[i] & ~plic->claimed[i]) &
plic->enable[addrid * plic->bitfield_words + i];
if (!pending_enabled_not_claimed) {
continue;
}
for (j = 0; j < 32; j++) {
int irq = (i << 5) + j;
uint32_t prio = plic->source_priority[irq];
int enabled = pending_enabled_not_claimed & (1 << j);
if (enabled && prio > max_prio) {
max_irq = irq;
max_prio = prio;
}
}
}
if (max_irq) {
sifive_plic_set_pending(plic, max_irq, false);
sifive_plic_set_claimed(plic, max_irq, true);
}
return max_irq;
}
static uint64_t sifive_plic_read(void *opaque, hwaddr addr, unsigned size)
@ -223,10 +153,15 @@ static uint64_t sifive_plic_read(void *opaque, hwaddr addr, unsigned size)
if (contextid == 0) {
return plic->target_priority[addrid];
} else if (contextid == 4) {
uint32_t value = sifive_plic_claim(plic, addrid);
uint32_t max_irq = sifive_plic_claimed(plic, addrid);
if (max_irq) {
sifive_plic_set_pending(plic, max_irq, false);
sifive_plic_set_claimed(plic, max_irq, true);
}
sifive_plic_update(plic);
return value;
return max_irq;
}
}