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authorMarc Zyngier <maz@kernel.org>2020-03-04 23:33:20 +0300
committerMarc Zyngier <maz@kernel.org>2020-03-24 15:15:51 +0300
commitae699ad348cdcd416cbf28e8a02fc468780161f7 (patch)
tree82593ec6caed02972b4c63e58bb22a11dcb663e2 /drivers/irqchip
parent05d32df13c6b3c0850b68928048536e9a736d520 (diff)
downloadlinux-ae699ad348cdcd416cbf28e8a02fc468780161f7.tar.xz
irqchip/gic-v4.1: Move doorbell management to the GICv4 abstraction layer
In order to hide some of the differences between v4.0 and v4.1, move the doorbell management out of the KVM code, and into the GICv4-specific layer. This allows the calling code to ask for the doorbell when blocking, and otherwise to leave the doorbell permanently disabled. This matches the v4.1 code perfectly, and only results in a minor refactoring of the v4.0 code. Signed-off-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Zenghui Yu <yuzenghui@huawei.com> Link: https://lore.kernel.org/r/20200304203330.4967-14-maz@kernel.org
Diffstat (limited to 'drivers/irqchip')
-rw-r--r--drivers/irqchip/irq-gic-v4.c45
1 files changed, 41 insertions, 4 deletions
diff --git a/drivers/irqchip/irq-gic-v4.c b/drivers/irqchip/irq-gic-v4.c
index c01910d53f9e..117ba6db023d 100644
--- a/drivers/irqchip/irq-gic-v4.c
+++ b/drivers/irqchip/irq-gic-v4.c
@@ -87,6 +87,11 @@ static struct irq_domain *gic_domain;
static const struct irq_domain_ops *vpe_domain_ops;
static const struct irq_domain_ops *sgi_domain_ops;
+static bool has_v4_1(void)
+{
+ return !!sgi_domain_ops;
+}
+
int its_alloc_vcpu_irqs(struct its_vm *vm)
{
int vpe_base_irq, i;
@@ -139,18 +144,50 @@ static int its_send_vpe_cmd(struct its_vpe *vpe, struct its_cmd_info *info)
return irq_set_vcpu_affinity(vpe->irq, info);
}
-int its_schedule_vpe(struct its_vpe *vpe, bool on)
+int its_make_vpe_non_resident(struct its_vpe *vpe, bool db)
{
- struct its_cmd_info info;
+ struct irq_desc *desc = irq_to_desc(vpe->irq);
+ struct its_cmd_info info = { };
int ret;
WARN_ON(preemptible());
- info.cmd_type = on ? SCHEDULE_VPE : DESCHEDULE_VPE;
+ info.cmd_type = DESCHEDULE_VPE;
+ if (has_v4_1()) {
+ /* GICv4.1 can directly deal with doorbells */
+ info.req_db = db;
+ } else {
+ /* Undo the nested disable_irq() calls... */
+ while (db && irqd_irq_disabled(&desc->irq_data))
+ enable_irq(vpe->irq);
+ }
+
+ ret = its_send_vpe_cmd(vpe, &info);
+ if (!ret)
+ vpe->resident = false;
+
+ return ret;
+}
+
+int its_make_vpe_resident(struct its_vpe *vpe, bool g0en, bool g1en)
+{
+ struct its_cmd_info info = { };
+ int ret;
+
+ WARN_ON(preemptible());
+
+ info.cmd_type = SCHEDULE_VPE;
+ if (has_v4_1()) {
+ info.g0en = g0en;
+ info.g1en = g1en;
+ } else {
+ /* Disabled the doorbell, as we're about to enter the guest */
+ disable_irq_nosync(vpe->irq);
+ }
ret = its_send_vpe_cmd(vpe, &info);
if (!ret)
- vpe->resident = on;
+ vpe->resident = true;
return ret;
}