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Subject[PATCH v5 04/14] vfio/mdev: idxd: Add auxialary device plumbing for idxd mdev support
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Add the VFIO mediated device driver as an auxiliary device to the main idxd
driver. This allows the mdev code to be under VFIO mdev subsystem.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
MAINTAINERS | 8 ++++
drivers/dma/idxd/Makefile | 2 +
drivers/dma/idxd/idxd.h | 7 ++++
drivers/dma/idxd/init.c | 77 +++++++++++++++++++++++++++++++++++++++
drivers/vfio/mdev/Kconfig | 9 +++++
drivers/vfio/mdev/Makefile | 1 +
drivers/vfio/mdev/idxd/Makefile | 4 ++
drivers/vfio/mdev/idxd/mdev.c | 75 ++++++++++++++++++++++++++++++++++++++
8 files changed, 182 insertions(+), 1 deletion(-)
create mode 100644 drivers/vfio/mdev/idxd/Makefile
create mode 100644 drivers/vfio/mdev/idxd/mdev.c

diff --git a/MAINTAINERS b/MAINTAINERS
index ae34b0331eb4..71862e759075 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8970,7 +8970,6 @@ INTEL IADX DRIVER
M: Dave Jiang <dave.jiang@intel.com>
L: dmaengine@vger.kernel.org
S: Supported
-F: Documentation/driver-api/vfio/mdev-idxd.rst
F: drivers/dma/idxd/*
F: include/uapi/linux/idxd.h

@@ -18720,6 +18719,13 @@ F: drivers/vfio/mdev/
F: include/linux/mdev.h
F: samples/vfio-mdev/

+VFIO MEDIATED DEVICE IDXD DRIVER
+M: Dave Jiang <dave.jiang@intel.com>
+L: kvm@vger.kernel.org
+S: Maintained
+F: Documentation/driver-api/vfio/mdev-idxd.rst
+F: drivers/vfio/mdev/idxd/
+
VFIO PLATFORM DRIVER
M: Eric Auger <eric.auger@redhat.com>
L: kvm@vger.kernel.org
diff --git a/drivers/dma/idxd/Makefile b/drivers/dma/idxd/Makefile
index 8978b898d777..d91d1718efac 100644
--- a/drivers/dma/idxd/Makefile
+++ b/drivers/dma/idxd/Makefile
@@ -1,2 +1,4 @@
+ccflags-y += -DDEFAULT_SYMBOL_NAMESPACE=IDXD
+
obj-$(CONFIG_INTEL_IDXD) += idxd.o
idxd-y := init.o irq.o device.o sysfs.o submit.o dma.o cdev.o
diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
index a2438b3166db..f02c96164515 100644
--- a/drivers/dma/idxd/idxd.h
+++ b/drivers/dma/idxd/idxd.h
@@ -8,6 +8,7 @@
#include <linux/percpu-rwsem.h>
#include <linux/wait.h>
#include <linux/cdev.h>
+#include <linux/auxiliary_bus.h>
#include "registers.h"

#define IDXD_DRIVER_VERSION "1.00"
@@ -221,6 +222,8 @@ struct idxd_device {
struct work_struct work;

int *int_handles;
+
+ struct auxiliary_device *mdev_auxdev;
};

/* IDXD software descriptor */
@@ -282,6 +285,10 @@ enum idxd_interrupt_type {
IDXD_IRQ_IMS,
};

+struct idxd_mdev_aux_drv {
+ struct auxiliary_driver auxiliary_drv;
+};
+
static inline int idxd_get_wq_portal_offset(enum idxd_portal_prot prot,
enum idxd_interrupt_type irq_type)
{
diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index ee56b92108d8..fd57f39e4b7d 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -382,6 +382,74 @@ static void idxd_disable_system_pasid(struct idxd_device *idxd)
idxd->sva = NULL;
}

+static void idxd_remove_mdev_auxdev(struct idxd_device *idxd)
+{
+ if (!IS_ENABLED(CONFIG_VFIO_MDEV_IDXD))
+ return;
+
+ auxiliary_device_delete(idxd->mdev_auxdev);
+ auxiliary_device_uninit(idxd->mdev_auxdev);
+}
+
+static void idxd_auxdev_release(struct device *dev)
+{
+ struct auxiliary_device *auxdev = to_auxiliary_dev(dev);
+ struct idxd_device *idxd = dev_get_drvdata(dev);
+
+ kfree(auxdev->name);
+ kfree(auxdev);
+ idxd->mdev_auxdev = NULL;
+}
+
+static int idxd_setup_mdev_auxdev(struct idxd_device *idxd)
+{
+ struct auxiliary_device *auxdev;
+ struct device *dev = &idxd->pdev->dev;
+ int rc;
+
+ if (!IS_ENABLED(CONFIG_VFIO_MDEV_IDXD))
+ return 0;
+
+ auxdev = kzalloc(sizeof(*auxdev), GFP_KERNEL);
+ if (!auxdev)
+ return -ENOMEM;
+
+ auxdev->name = kasprintf(GFP_KERNEL, "mdev-%s", idxd_name[idxd->type]);
+ if (!auxdev->name) {
+ rc = -ENOMEM;
+ goto err_name;
+ }
+
+ dev_dbg(&idxd->pdev->dev, "aux dev mdev: %s\n", auxdev->name);
+
+ auxdev->dev.parent = dev;
+ auxdev->dev.release = idxd_auxdev_release;
+ auxdev->id = idxd->id;
+
+ rc = auxiliary_device_init(auxdev);
+ if (rc < 0) {
+ dev_err(dev, "Failed to init aux dev: %d\n", rc);
+ goto err_auxdev;
+ }
+
+ rc = auxiliary_device_add(auxdev);
+ if (rc < 0) {
+ dev_err(dev, "Failed to add aux dev: %d\n", rc);
+ goto err_auxdev;
+ }
+
+ idxd->mdev_auxdev = auxdev;
+ dev_set_drvdata(&auxdev->dev, idxd);
+
+ return 0;
+
+ err_auxdev:
+ kfree(auxdev->name);
+ err_name:
+ kfree(auxdev);
+ return rc;
+}
+
static int idxd_probe(struct idxd_device *idxd)
{
struct pci_dev *pdev = idxd->pdev;
@@ -434,11 +502,19 @@ static int idxd_probe(struct idxd_device *idxd)
goto err_idr_fail;
}

+ rc = idxd_setup_mdev_auxdev(idxd);
+ if (rc < 0)
+ goto err_auxdev_fail;
+
idxd->major = idxd_cdev_get_major(idxd);

dev_dbg(dev, "IDXD device %d probed successfully\n", idxd->id);
return 0;

+ err_auxdev_fail:
+ mutex_lock(&idxd_idr_lock);
+ idr_remove(&idxd_idrs[idxd->type], idxd->id);
+ mutex_unlock(&idxd_idr_lock);
err_idr_fail:
idxd_mask_error_interrupts(idxd);
idxd_mask_msix_vectors(idxd);
@@ -610,6 +686,7 @@ static void idxd_remove(struct pci_dev *pdev)
dev_dbg(&pdev->dev, "%s called\n", __func__);
idxd_cleanup_sysfs(idxd);
idxd_shutdown(pdev);
+ idxd_remove_mdev_auxdev(idxd);
if (device_pasid_enabled(idxd))
idxd_disable_system_pasid(idxd);
mutex_lock(&idxd_idr_lock);
diff --git a/drivers/vfio/mdev/Kconfig b/drivers/vfio/mdev/Kconfig
index 5da27f2100f9..e9540e43d1f1 100644
--- a/drivers/vfio/mdev/Kconfig
+++ b/drivers/vfio/mdev/Kconfig
@@ -16,3 +16,12 @@ config VFIO_MDEV_DEVICE
default n
help
VFIO based driver for Mediated devices.
+
+config VFIO_MDEV_IDXD
+ tristate "VFIO Mediated device driver for Intel IDXD"
+ depends on VFIO && VFIO_MDEV && X86_64
+ select AUXILIARY_BUS
+ select IMS_MSI_ARRAY
+ default n
+ help
+ VFIO based mediated device driver for Intel Accelerator Devices driver.
diff --git a/drivers/vfio/mdev/Makefile b/drivers/vfio/mdev/Makefile
index 101516fdf375..338843fa6110 100644
--- a/drivers/vfio/mdev/Makefile
+++ b/drivers/vfio/mdev/Makefile
@@ -4,3 +4,4 @@ mdev-y := mdev_core.o mdev_sysfs.o mdev_driver.o

obj-$(CONFIG_VFIO_MDEV) += mdev.o
obj-$(CONFIG_VFIO_MDEV_DEVICE) += vfio_mdev.o
+obj-$(CONFIG_VFIO_MDEV_IDXD) += idxd/
diff --git a/drivers/vfio/mdev/idxd/Makefile b/drivers/vfio/mdev/idxd/Makefile
new file mode 100644
index 000000000000..e8f45cb96117
--- /dev/null
+++ b/drivers/vfio/mdev/idxd/Makefile
@@ -0,0 +1,4 @@
+ccflags-y += -I$(srctree)/drivers/dma/idxd -DDEFAULT_SYMBOL_NAMESPACE=IDXD
+
+obj-$(CONFIG_VFIO_MDEV_IDXD) += idxd_mdev.o
+idxd_mdev-y := mdev.o
diff --git a/drivers/vfio/mdev/idxd/mdev.c b/drivers/vfio/mdev/idxd/mdev.c
new file mode 100644
index 000000000000..8b9a6adeb606
--- /dev/null
+++ b/drivers/vfio/mdev/idxd/mdev.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2020 Intel Corporation. All rights rsvd. */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/device.h>
+#include <linux/auxiliary_bus.h>
+#include <uapi/linux/idxd.h>
+#include "registers.h"
+#include "idxd.h"
+
+static int idxd_mdev_host_init(struct idxd_device *idxd)
+{
+ /* FIXME: Fill in later */
+ return 0;
+}
+
+static int idxd_mdev_host_release(struct idxd_device *idxd)
+{
+ /* FIXME: Fill in later */
+ return 0;
+}
+
+static int idxd_mdev_aux_probe(struct auxiliary_device *auxdev,
+ const struct auxiliary_device_id *id)
+{
+ struct idxd_device *idxd = dev_get_drvdata(&auxdev->dev);
+ int rc;
+
+ rc = idxd_mdev_host_init(idxd);
+ if (rc < 0) {
+ dev_warn(&auxdev->dev, "mdev host init failed: %d\n", rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+static void idxd_mdev_aux_remove(struct auxiliary_device *auxdev)
+{
+ struct idxd_device *idxd = dev_get_drvdata(&auxdev->dev);
+
+ idxd_mdev_host_release(idxd);
+}
+
+static const struct auxiliary_device_id idxd_mdev_auxbus_id_table[] = {
+ { .name = "idxd.mdev-dsa" },
+ { .name = "idxd.mdev-iax" },
+ {},
+};
+MODULE_DEVICE_TABLE(auxiliary, idxd_mdev_auxbus_id_table);
+
+static struct idxd_mdev_aux_drv idxd_mdev_aux_drv = {
+ .auxiliary_drv = {
+ .id_table = idxd_mdev_auxbus_id_table,
+ .probe = idxd_mdev_aux_probe,
+ .remove = idxd_mdev_aux_remove,
+ },
+};
+
+static int idxd_mdev_auxdev_drv_register(struct idxd_mdev_aux_drv *drv)
+{
+ return auxiliary_driver_register(&drv->auxiliary_drv);
+}
+
+static void idxd_mdev_auxdev_drv_unregister(struct idxd_mdev_aux_drv *drv)
+{
+ auxiliary_driver_unregister(&drv->auxiliary_drv);
+}
+
+module_driver(idxd_mdev_aux_drv, idxd_mdev_auxdev_drv_register, idxd_mdev_auxdev_drv_unregister);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Intel Corporation");

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