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Groups > linux.kernel > #1676826
| From | Marc Zyngier <marc.zyngier@arm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v2 18/52] irqchip/gic-v3-its: Add VLPI configuration handling |
| Date | 2017-06-28 17:20 +0200 |
| Message-ID | <tXmV6-8uj-73@gated-at.bofh.it> (permalink) |
| References | <tXmLn-8q5-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
When a VLPI is reconfigured (enabled, disabled, change in priority),
the full configuration byte must be written, and the caches invalidated.
Also, when using the irq_mask/irq_unmask methods, it is necessary
to disable the doorbell for that particular interrupt (by mapping it
to 1023) on top of clearing the Enable bit.
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
drivers/irqchip/irq-gic-v3-its.c | 73 +++++++++++++++++++++++++++++++++++++---
1 file changed, 69 insertions(+), 4 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 527e4e95e10d..2e5e0499a0e6 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -808,18 +808,26 @@ static inline u32 its_get_event_id(struct irq_data *d)
return d->hwirq - its_dev->event_map.lpi_base;
}
-static void lpi_update_config(struct irq_data *d, u8 clr, u8 set)
+static void lpi_write_config(struct irq_data *d, u8 clr, u8 set)
{
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
- irq_hw_number_t hwirq = d->hwirq;
+ irq_hw_number_t hwirq;
struct page *prop_page;
u8 *cfg;
- prop_page = gic_rdists->prop_page;
+ if (irqd_is_forwarded_to_vcpu(d)) {
+ u32 event = its_get_event_id(d);
+
+ prop_page = its_dev->event_map.vm->vprop_page;
+ hwirq = its_dev->event_map.vlpi_maps[event].vintid;
+ } else {
+ prop_page = gic_rdists->prop_page;
+ hwirq = d->hwirq;
+ }
cfg = page_address(prop_page) + hwirq - 8192;
*cfg &= ~clr;
- *cfg |= set;
+ *cfg |= set | LPI_PROP_GROUP1;
/*
* Make the above write visible to the redistributors.
@@ -830,16 +838,52 @@ static void lpi_update_config(struct irq_data *d, u8 clr, u8 set)
gic_flush_dcache_to_poc(cfg, sizeof(*cfg));
else
dsb(ishst);
+}
+
+static void lpi_update_config(struct irq_data *d, u8 clr, u8 set)
+{
+ struct its_device *its_dev = irq_data_get_irq_chip_data(d);
+
+ lpi_write_config(d, clr, set);
its_send_inv(its_dev, its_get_event_id(d));
}
+static void its_vlpi_set_doorbell(struct irq_data *d, bool enable)
+{
+ struct its_device *its_dev = irq_data_get_irq_chip_data(d);
+ u32 event = its_get_event_id(d);
+
+ if (its_dev->event_map.vlpi_maps[event].db_enabled == enable)
+ return;
+
+ its_dev->event_map.vlpi_maps[event].db_enabled = enable;
+
+ /*
+ * More fun with the architecture:
+ *
+ * Ideally, we'd issue a VMAPTI to set the doorbell to its LPI
+ * value or to 1023, depending on the enable bit. But that
+ * would be issueing a mapping for an /existing/ DevID+EventID
+ * pair, which is UNPREDICTABLE. Instead, let's issue a VMOVI
+ * to the /same/ vPE, using this opportunity to adjust the
+ * doorbell. Mouahahahaha. We loves it, Precious.
+ */
+ its_send_vmovi(its_dev, event);
+}
+
static void its_mask_irq(struct irq_data *d)
{
+ if (irqd_is_forwarded_to_vcpu(d))
+ its_vlpi_set_doorbell(d, false);
+
lpi_update_config(d, LPI_PROP_ENABLED, 0);
}
static void its_unmask_irq(struct irq_data *d)
{
+ if (irqd_is_forwarded_to_vcpu(d))
+ its_vlpi_set_doorbell(d, true);
+
lpi_update_config(d, 0, LPI_PROP_ENABLED);
}
@@ -852,6 +896,10 @@ static int its_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
struct its_collection *target_col;
u32 id = its_get_event_id(d);
+ /* A forwarded interrupt should use irq_set_vcpu_affinity */
+ if (irqd_is_forwarded_to_vcpu(d))
+ return -EINVAL;
+
/* lpi cannot be routed to a redistributor that is on a foreign node */
if (its_dev->its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_23144) {
if (its_dev->its->numa_node >= 0) {
@@ -1017,6 +1065,22 @@ static int its_vlpi_unmap(struct irq_data *d)
return ret;
}
+static int its_vlpi_prop_update(struct irq_data *d, struct its_cmd_info *info)
+{
+ struct its_device *its_dev = irq_data_get_irq_chip_data(d);
+
+ if (!its_dev->event_map.vm || !irqd_is_forwarded_to_vcpu(d))
+ return -EINVAL;
+
+ if (info->cmd_type == PROP_UPDATE_AND_INV_VLPI)
+ lpi_update_config(d, 0xff, info->config);
+ else
+ lpi_write_config(d, 0xff, info->config);
+ its_vlpi_set_doorbell(d, !!(info->config & LPI_PROP_ENABLED));
+
+ return 0;
+}
+
static int its_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
{
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
@@ -1039,6 +1103,7 @@ static int its_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
case PROP_UPDATE_VLPI:
case PROP_UPDATE_AND_INV_VLPI:
+ return its_vlpi_prop_update(d, info);
default:
return -EINVAL;
--
2.11.0
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[PATCH v2 00/52] irqchip: KVM: Add support for GICv4 Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 07/52] irqchip/gic-v3-its: Implement irq_set_irqchip_state for pending state Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 39/52] KVM: arm/arm64: GICv4: Wire mapping/unmapping of VLPIs in VFIO irq bypass Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 51/52] KVM: arm/arm64: GICv4: Use pending_last as a scheduling hint Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 30/52] irqchip/gic-v4: Add VPE command interface Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 48/52] KVM: arm/arm64: GICv4: Add doorbell interrupt handling Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 28/52] irqchip/gic-v3-its: Set implementation defined bit to enable VLPIs Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 43/52] KVM: arm/arm64: GICv4: Handle CLEAR applied to a VLPI Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 44/52] KVM: arm/arm64: GICv4: Handle MOVALL applied to a vPE Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 41/52] KVM: arm/arm64: GICv4: Unmap VLPI when freeing an LPI Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 50/52] KVM: arm/arm64: GICv4: Enable virtual cpuif if VLPIs can be delivered Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 49/52] KVM: arm/arm64: GICv4: Hook vPE scheduling into vgic flush/sync Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 37/52] KVM: arm/arm64: GICv4: Add init and teardown of the vPE irq domain Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 52/52] KVM: arm/arm64: GICv4: Enable VLPI support Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 35/52] KVM: arm/arm64: vgic: Move kvm_vgic_destroy call around Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 08/52] irqchip/gic-v3-its: Split out property table allocation Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:10 +0200 [PATCH v2 47/52] KVM: arm/arm64: GICv4: Propagate VLPI properties at map time Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 19/52] irqchip/gic-v3-its: Add VPE domain infrastructure Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 15/52] irqchip/gic-v3-its: Add GICv4 ITS command definitions Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 42/52] KVM: arm/arm64: GICv4: Handle MOVI applied to a VLPI Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 38/52] KVM: arm/arm64: GICv4: Wire init/teardown of per-VM support Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 32/52] irqchip/gic-v4: Add some basic documentation Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 24/52] irqchip/gic-v3-its: Add VPE invalidation hook Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 33/52] irqchip/gic-v4: Enable low-level GICv4 operations Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 29/52] irqchip/gic-v4: Add per-VM VPE domain creation Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 22/52] irqchip/gic-v3-its: Add VPENDBASER/VPROPBASER accessors Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 13/52] irqchip/gic-v3-its: Generalize LPI configuration Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 40/52] KVM: arm/arm64: GICv4: Handle INT command applied to a VLPI Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 23/52] irqchip/gic-v3-its: Add VPE scheduling Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 17/52] irqchip/gic-v3-its: Add VLPI map/unmap operations Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 46/52] KVM: arm/arm64: GICv4: Handle INVALL applied to a vPE Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 12/52] irqchip/gic-v3-its: Generalize device table allocation Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 09/52] irqchip/gic-v3-its: Allow use of indirect VCPU tables Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 14/52] irqchip/gic-v4: Add management structure definitions Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 11/52] irqchip/gic-v3-its: Rework LPI freeing Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 31/52] irqchip/gic-v4: Add VLPI configuration interface Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 21/52] irqchip/gic-v3-its: Add VPE irq domain [de]activation Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 25/52] irqchip/gic-v3-its: Add VPE affinity changes Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 18/52] irqchip/gic-v3-its: Add VLPI configuration handling Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 16/52] irqchip/gic-v3-its: Add VLPI configuration hook Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 20/52] irqchip/gic-v3-its: Add VPE irq domain allocation/teardown Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 36/52] KVM: arm/arm64: vITS: Add MSI translation helpers Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:20 +0200 [PATCH v2 10/52] irqchip/gic-v3-its: Split out pending table allocation Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:30 +0200 [PATCH v2 02/52] irqchip/gic-v3: Add redistributor iterator Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:30 +0200 [PATCH v2 06/52] irqchip/gic-v3-its: Macro-ize its_send_single_command Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:30 +0200 [PATCH v2 04/52] irqchip/gic-v3-its: Move LPI definitions around Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:30 +0200 [PATCH v2 05/52] irqchip/gic-v3-its: Add probing for VLPI properties Marc Zyngier <marc.zyngier@arm.com> - 2017-06-28 17:30 +0200 RE: [PATCH v2 00/52] irqchip: KVM: Add support for GICv4 "Shanker Donthineni" <shankerd@codeaurora.org> - 2017-07-01 17:00 +0200
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