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hw/intc/arm_gicv3_its: Refactor process_its_cmd() to reduce nesting

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Refactor process_its_cmd() so that it consistently uses
the structure
  do thing;
  if (error condition) {
      return early;
  }
  do next thing;

rather than doing some of the work nested inside if (not error)
code blocks.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220111171048.3545974-8-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2022-01-11 17:10:42 +00:00
parent 593a7cc2d3
commit be0ed8fb7f
1 changed files with 50 additions and 53 deletions
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103
hw/intc/arm_gicv3_its.c
View file

@ -273,79 +273,76 @@ static ItsCmdResult process_its_cmd(GICv3ITSState *s, uint64_t value,
}
dte_valid = FIELD_EX64(dte, DTE, VALID);
if (dte_valid) {
num_eventids = 1ULL << (FIELD_EX64(dte, DTE, SIZE) + 1);
ite_valid = get_ite(s, eventid, dte, &icid, &pIntid, &res);
if (res != MEMTX_OK) {
return CMD_STALL;
}
if (ite_valid) {
cte_valid = get_cte(s, icid, &cte, &res);
}
if (res != MEMTX_OK) {
return CMD_STALL;
}
} else {
if (!dte_valid) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: invalid command attributes: "
"invalid dte: %"PRIx64" for %d (MEM_TX: %d)\n",
__func__, dte, devid, res);
"invalid dte: %"PRIx64" for %d\n",
__func__, dte, devid);
return CMD_CONTINUE;
}
num_eventids = 1ULL << (FIELD_EX64(dte, DTE, SIZE) + 1);
ite_valid = get_ite(s, eventid, dte, &icid, &pIntid, &res);
if (res != MEMTX_OK) {
return CMD_STALL;
}
if (!ite_valid) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: invalid command attributes: invalid ITE\n",
__func__);
return CMD_CONTINUE;
}
cte_valid = get_cte(s, icid, &cte, &res);
if (res != MEMTX_OK) {
return CMD_STALL;
}
if (!cte_valid) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: invalid command attributes: "
"invalid cte: %"PRIx64"\n",
__func__, cte);
return CMD_CONTINUE;
}
/*
* In this implementation, in case of guest errors we ignore the
* command and move onto the next command in the queue.
*/
if (devid >= s->dt.num_ids) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: invalid command attributes: devid %d>=%d",
__func__, devid, s->dt.num_ids);
return CMD_CONTINUE;
} else if (!dte_valid || !ite_valid || !cte_valid) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: invalid command attributes: "
"dte: %s, ite: %s, cte: %s\n",
__func__,
dte_valid ? "valid" : "invalid",
ite_valid ? "valid" : "invalid",
cte_valid ? "valid" : "invalid");
return CMD_CONTINUE;
} else if (eventid >= num_eventids) {
}
if (eventid >= num_eventids) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: invalid command attributes: eventid %d >= %"
PRId64 "\n",
__func__, eventid, num_eventids);
return CMD_CONTINUE;
} else {
/*
* Current implementation only supports rdbase == procnum
* Hence rdbase physical address is ignored
*/
rdbase = FIELD_EX64(cte, CTE, RDBASE);
}
if (rdbase >= s->gicv3->num_cpu) {
return CMD_CONTINUE;
}
/*
* Current implementation only supports rdbase == procnum
* Hence rdbase physical address is ignored
*/
rdbase = FIELD_EX64(cte, CTE, RDBASE);
if ((cmd == CLEAR) || (cmd == DISCARD)) {
gicv3_redist_process_lpi(&s->gicv3->cpu[rdbase], pIntid, 0);
} else {
gicv3_redist_process_lpi(&s->gicv3->cpu[rdbase], pIntid, 1);
}
if (cmd == DISCARD) {
IteEntry ite = {};
/* remove mapping from interrupt translation table */
return update_ite(s, eventid, dte, ite) ? CMD_CONTINUE : CMD_STALL;
}
if (rdbase >= s->gicv3->num_cpu) {
return CMD_CONTINUE;
}
if ((cmd == CLEAR) || (cmd == DISCARD)) {
gicv3_redist_process_lpi(&s->gicv3->cpu[rdbase], pIntid, 0);
} else {
gicv3_redist_process_lpi(&s->gicv3->cpu[rdbase], pIntid, 1);
}
if (cmd == DISCARD) {
IteEntry ite = {};
/* remove mapping from interrupt translation table */
return update_ite(s, eventid, dte, ite) ? CMD_CONTINUE : CMD_STALL;
}
return CMD_CONTINUE;
}
static ItsCmdResult process_mapti(GICv3ITSState *s, uint64_t value,