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Subject[PATCH v5 12/14] vfio/mdev: idxd: add irq bypass for IMS vectors
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Add support to bypass host for IMS interrupts configured for the guest.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
drivers/vfio/mdev/Kconfig | 1 +
drivers/vfio/mdev/idxd/mdev.c | 17 +++++++++++++++--
drivers/vfio/mdev/idxd/mdev.h | 1 +
3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/vfio/mdev/Kconfig b/drivers/vfio/mdev/Kconfig
index e9540e43d1f1..ab0a6f0930bc 100644
--- a/drivers/vfio/mdev/Kconfig
+++ b/drivers/vfio/mdev/Kconfig
@@ -22,6 +22,7 @@ config VFIO_MDEV_IDXD
depends on VFIO && VFIO_MDEV && X86_64
select AUXILIARY_BUS
select IMS_MSI_ARRAY
+ select IRQ_BYPASS_MANAGER
default n
help
VFIO based mediated device driver for Intel Accelerator Devices driver.
diff --git a/drivers/vfio/mdev/idxd/mdev.c b/drivers/vfio/mdev/idxd/mdev.c
index 8a4af882a47f..d59920f78109 100644
--- a/drivers/vfio/mdev/idxd/mdev.c
+++ b/drivers/vfio/mdev/idxd/mdev.c
@@ -616,9 +616,13 @@ static int msix_trigger_unregister(struct vdcm_idxd *vidxd, int index)

dev_dbg(dev, "disable MSIX trigger %d\n", index);
if (index) {
+ struct irq_bypass_producer *producer;
u32 auxval;

+ producer = &vidxd->vdev.producer[index];
+ irq_bypass_unregister_producer(producer);
irq_entry = &vidxd->irq_entries[index];
+
if (irq_entry->irq_set) {
free_irq(irq_entry->irq, irq_entry);
irq_entry->irq_set = false;
@@ -654,9 +658,10 @@ static int msix_trigger_register(struct vdcm_idxd *vidxd, u32 fd, int index)
}

if (index) {
- u32 pasid;
- u32 auxval;
+ struct irq_bypass_producer *producer;
+ u32 pasid, auxval;

+ producer = &vidxd->vdev.producer[index];
irq_entry = &vidxd->irq_entries[index];
rc = idxd_mdev_get_pasid(mdev, &pasid);
if (rc < 0)
@@ -682,6 +687,14 @@ static int msix_trigger_register(struct vdcm_idxd *vidxd, u32 fd, int index)
irq_set_auxdata(irq_entry->irq, IMS_AUXDATA_CONTROL_WORD, auxval);
return rc;
}
+
+ producer->token = trigger;
+ producer->irq = irq_entry->irq;
+ rc = irq_bypass_register_producer(producer);
+ if (unlikely(rc))
+ dev_info(dev, "irq bypass producer (token %p) registration failed: %d\n",
+ producer->token, rc);
+
irq_entry->irq_set = true;
}

diff --git a/drivers/vfio/mdev/idxd/mdev.h b/drivers/vfio/mdev/idxd/mdev.h
index 8421b4962ac7..1f867de416e7 100644
--- a/drivers/vfio/mdev/idxd/mdev.h
+++ b/drivers/vfio/mdev/idxd/mdev.h
@@ -45,6 +45,7 @@ struct idxd_vdev {
struct mdev_device *mdev;
struct vfio_group *vfio_group;
struct eventfd_ctx *msix_trigger[VIDXD_MAX_MSIX_ENTRIES];
+ struct irq_bypass_producer producer[VIDXD_MAX_MSIX_ENTRIES];
};

struct vdcm_idxd {

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