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target/hppa: Populate an interval tree with valid tlb entries

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Complete the data structure conversion started earlier.  This reduces
the perf overhead of hppa_get_physical_address from ~5% to ~0.25%.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-10-27 00:24:30 -07:00
parent 09cae8255f
commit d7553f3591
4 changed files with 167 additions and 71 deletions
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51
target/hppa/machine.c
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@ -72,8 +72,6 @@ static int get_tlb(QEMUFile *f, void *opaque, size_t size,
HPPATLBEntry *ent = opaque;
uint32_t val;
memset(ent, 0, sizeof(*ent));
ent->itree.start = qemu_get_be64(f);
ent->pa = qemu_get_betr(f);
val = qemu_get_be32(f);
@ -122,6 +120,53 @@ static const VMStateInfo vmstate_tlb = {
.put = put_tlb,
};
static int tlb_pre_load(void *opaque)
{
CPUHPPAState *env = opaque;
/*
* Zap the entire tlb, on-the-side data structures and all.
* Each tlb entry will have data re-filled by put_tlb.
*/
memset(env->tlb, 0, sizeof(env->tlb));
memset(&env->tlb_root, 0, sizeof(env->tlb_root));
env->tlb_unused = NULL;
env->tlb_partial = NULL;
return 0;
}
static int tlb_post_load(void *opaque, int version_id)
{
CPUHPPAState *env = opaque;
HPPATLBEntry **unused = &env->tlb_unused;
HPPATLBEntry *partial = NULL;
/*
* Re-create the interval tree from the valid entries.
* Truely invalid entries should have start == end == 0.
* Otherwise it should be the in-flight tlb_partial entry.
*/
for (uint32_t i = 0; i < ARRAY_SIZE(env->tlb); ++i) {
HPPATLBEntry *e = &env->tlb[i];
if (e->entry_valid) {
interval_tree_insert(&e->itree, &env->tlb_root);
} else if (i < HPPA_BTLB_ENTRIES) {
/* btlb not in unused list */
} else if (partial == NULL && e->itree.start < e->itree.last) {
partial = e;
} else {
*unused = e;
unused = &e->unused_next;
}
}
env->tlb_partial = partial;
*unused = NULL;
return 0;
}
static VMStateField vmstate_env_fields[] = {
VMSTATE_UINTTR_ARRAY(gr, CPUHPPAState, 32),
VMSTATE_UINT64_ARRAY(fr, CPUHPPAState, 32),
@ -164,6 +209,8 @@ static const VMStateDescription vmstate_env = {
.version_id = 1,
.minimum_version_id = 1,
.fields = vmstate_env_fields,
.pre_load = tlb_pre_load,
.post_load = tlb_post_load,
};
static VMStateField vmstate_cpu_fields[] = {