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irqchip/gic-v3-its: Allow use of indirect VCPU tables

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The VCPU tables can be quite sparse as well, and it makes sense
to use indirect tables as well if possible.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2016-12-19 18:18:34 +00:00
parent 0e5ccf91e0
commit 4cacac5744
1 changed files with 17 additions and 8 deletions
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25
drivers/irqchip/irq-gic-v3-its.c
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@ -1077,10 +1077,13 @@ retry_baser:
return 0;
}
static bool its_parse_baser_device(struct its_node *its, struct its_baser *baser,
u32 psz, u32 *order)
static bool its_parse_indirect_baser(struct its_node *its,
struct its_baser *baser,
u32 psz, u32 *order)
{
u64 esz = GITS_BASER_ENTRY_SIZE(its_read_baser(its, baser));
u64 tmp = its_read_baser(its, baser);
u64 type = GITS_BASER_TYPE(tmp);
u64 esz = GITS_BASER_ENTRY_SIZE(tmp);
u64 val = GITS_BASER_InnerShareable | GITS_BASER_RaWaWb;
u32 ids = its->device_ids;
u32 new_order = *order;
@ -1119,8 +1122,9 @@ static bool its_parse_baser_device(struct its_node *its, struct its_baser *baser
if (new_order >= MAX_ORDER) {
new_order = MAX_ORDER - 1;
ids = ilog2(PAGE_ORDER_TO_SIZE(new_order) / (int)esz);
pr_warn("ITS@%pa: Device Table too large, reduce ids %u->%u\n",
&its->phys_base, its->device_ids, ids);
pr_warn("ITS@%pa: %s Table too large, reduce ids %u->%u\n",
&its->phys_base, its_base_type_string[type],
its->device_ids, ids);
}
*order = new_order;
@ -1168,11 +1172,16 @@ static int its_alloc_tables(struct its_node *its)
u32 order = get_order(psz);
bool indirect = false;
if (type == GITS_BASER_TYPE_NONE)
switch (type) {
case GITS_BASER_TYPE_NONE:
continue;
if (type == GITS_BASER_TYPE_DEVICE)
indirect = its_parse_baser_device(its, baser, psz, &order);
case GITS_BASER_TYPE_DEVICE:
case GITS_BASER_TYPE_VCPU:
indirect = its_parse_indirect_baser(its, baser,
psz, &order);
break;
}
err = its_setup_baser(its, baser, cache, shr, psz, order, indirect);
if (err < 0) {