linux-kernel - [RFC PATCH V3 09/26] vfio/pci: Move per-interrupt contexts to generic interrupt struct

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Date:   Fri, 27 Oct 2023 10:00:41 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     jgg@...dia.com, yishaih@...dia.com,
        shameerali.kolothum.thodi@...wei.com, kevin.tian@...el.com,
        alex.williamson@...hat.com
Cc:     kvm@...r.kernel.org, dave.jiang@...el.com, jing2.liu@...el.com,
        ashok.raj@...el.com, fenghua.yu@...el.com,
        tom.zanussi@...ux.intel.com, reinette.chatre@...el.com,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: [RFC PATCH V3 09/26] vfio/pci: Move per-interrupt contexts to generic interrupt struct

VFIO PCI interrupt management maintains per-interrupt context within an
xarray using the interrupt vector as index.

Move the per-interrupt context to the generic interrupt context in
struct vfio_pci_intr_ctx to enable the per-interrupt context to be
managed by different backends.

Signed-off-by: Reinette Chatre <reinette.chatre@...el.com>
---
Changes since RFC V2:
- Improve changelog.

 drivers/vfio/pci/vfio_pci_core.c  | 1 -
 drivers/vfio/pci/vfio_pci_intrs.c | 9 +++++----
 include/linux/vfio_pci_core.h     | 3 ++-
 3 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index bf4de137ad2f..cf303a9555f0 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -2162,7 +2162,6 @@ int vfio_pci_core_init_dev(struct vfio_device *core_vdev)
 	INIT_LIST_HEAD(&vdev->vma_list);
 	INIT_LIST_HEAD(&vdev->sriov_pfs_item);
 	init_rwsem(&vdev->memory_lock);
-	xa_init(&vdev->ctx);
 	vfio_pci_init_intr_ctx(vdev, &vdev->intr_ctx);
 
 	return 0;
diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c
index 5d600548b5d7..3cfd7fdec87b 100644
--- a/drivers/vfio/pci/vfio_pci_intrs.c
+++ b/drivers/vfio/pci/vfio_pci_intrs.c
@@ -52,13 +52,13 @@ static
 struct vfio_pci_irq_ctx *vfio_irq_ctx_get(struct vfio_pci_core_device *vdev,
 					  unsigned long index)
 {
-	return xa_load(&vdev->ctx, index);
+	return xa_load(&vdev->intr_ctx.ctx, index);
 }
 
 static void vfio_irq_ctx_free(struct vfio_pci_core_device *vdev,
 			      struct vfio_pci_irq_ctx *ctx, unsigned long index)
 {
-	xa_erase(&vdev->ctx, index);
+	xa_erase(&vdev->intr_ctx.ctx, index);
 	kfree(ctx);
 }
 
@@ -72,7 +72,7 @@ vfio_irq_ctx_alloc(struct vfio_pci_core_device *vdev, unsigned long index)
 	if (!ctx)
 		return NULL;
 
-	ret = xa_insert(&vdev->ctx, index, ctx, GFP_KERNEL_ACCOUNT);
+	ret = xa_insert(&vdev->intr_ctx.ctx, index, ctx, GFP_KERNEL_ACCOUNT);
 	if (ret) {
 		kfree(ctx);
 		return NULL;
@@ -530,7 +530,7 @@ static void vfio_msi_disable(struct vfio_pci_core_device *vdev, bool msix)
 	unsigned long i;
 	u16 cmd;
 
-	xa_for_each(&vdev->ctx, i, ctx) {
+	xa_for_each(&vdev->intr_ctx.ctx, i, ctx) {
 		vfio_virqfd_disable(&ctx->unmask);
 		vfio_virqfd_disable(&ctx->mask);
 		vfio_msi_set_vector_signal(vdev, i, -1, msix);
@@ -810,6 +810,7 @@ void vfio_pci_init_intr_ctx(struct vfio_pci_core_device *vdev,
 	intr_ctx->ops = &vfio_pci_intr_ops;
 	intr_ctx->priv = vdev;
 	mutex_init(&intr_ctx->igate);
+	xa_init(&intr_ctx->ctx);
 }
 EXPORT_SYMBOL_GPL(vfio_pci_init_intr_ctx);
 
diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h
index 1eb5842cff11..0f9df87aedd9 100644
--- a/include/linux/vfio_pci_core.h
+++ b/include/linux/vfio_pci_core.h
@@ -56,6 +56,7 @@ struct vfio_pci_region {
  * @igate:		Protects members of struct vfio_pci_intr_ctx
  * @err_trigger:	Eventfd associated with error reporting IRQ
  * @req_trigger:	Eventfd associated with device request notification
+ * @ctx:		Per-interrupt context indexed by vector
  */
 struct vfio_pci_intr_ctx {
 	const struct vfio_pci_intr_ops	*ops;
@@ -63,6 +64,7 @@ struct vfio_pci_intr_ctx {
 	struct mutex			igate;
 	struct eventfd_ctx		*err_trigger;
 	struct eventfd_ctx		*req_trigger;
+	struct xarray			ctx;
 };
 
 struct vfio_pci_intr_ops {
@@ -98,7 +100,6 @@ struct vfio_pci_core_device {
 	u8			*vconfig;
 	struct perm_bits	*msi_perm;
 	spinlock_t		irqlock;
-	struct xarray		ctx;
 	int			irq_type;
 	int			num_regions;
 	struct vfio_pci_region	*region;
-- 
2.34.1