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

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>

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 9d8d393..6ef6b0d 100644 (file)
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -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) {