Add vfio pci driver for Intel QAT VF devices.
This driver uses vfio_pci_core to register to the VFIO subsystem. It
acts as a vfio agent and interacts with the QAT PF driver to implement
VF live migration.
Co-developed-by: Yahui Cao <yahui.cao@xxxxxxxxx>
Signed-off-by: Yahui Cao <yahui.cao@xxxxxxxxx>
Signed-off-by: Xin Zeng <xin.zeng@xxxxxxxxx>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@xxxxxxxxx>
---
MAINTAINERS | 8 +
drivers/vfio/pci/Kconfig | 2 +
drivers/vfio/pci/Makefile | 2 +
drivers/vfio/pci/intel/qat/Kconfig | 12 +
drivers/vfio/pci/intel/qat/Makefile | 3 +
drivers/vfio/pci/intel/qat/main.c | 688 ++++++++++++++++++++++++++++
6 files changed, 715 insertions(+)
create mode 100644 drivers/vfio/pci/intel/qat/Kconfig
create mode 100644 drivers/vfio/pci/intel/qat/Makefile
create mode 100644 drivers/vfio/pci/intel/qat/main.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 5a4051996f1e..8961c7033b31 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -23099,6 +23099,14 @@ S: Maintained
F: Documentation/networking/device_drivers/ethernet/amd/pds_vfio_pci.rst
F: drivers/vfio/pci/pds/
+VFIO QAT PCI DRIVER
+M: Xin Zeng <xin.zeng@xxxxxxxxx>
+M: Giovanni Cabiddu <giovanni.cabiddu@xxxxxxxxx>
+L: kvm@xxxxxxxxxxxxxxx
+L: qat-linux@xxxxxxxxx
+S: Supported
+F: drivers/vfio/pci/intel/qat/
+
VFIO PLATFORM DRIVER
M: Eric Auger <eric.auger@xxxxxxxxxx>
L: kvm@xxxxxxxxxxxxxxx
diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
index 18c397df566d..329d25c53274 100644
--- a/drivers/vfio/pci/Kconfig
+++ b/drivers/vfio/pci/Kconfig
@@ -67,4 +67,6 @@ source "drivers/vfio/pci/pds/Kconfig"
source "drivers/vfio/pci/virtio/Kconfig"
+source "drivers/vfio/pci/intel/qat/Kconfig"
+
endmenu
diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile
index 046139a4eca5..a87b6b43ce1c 100644
--- a/drivers/vfio/pci/Makefile
+++ b/drivers/vfio/pci/Makefile
@@ -15,3 +15,5 @@ obj-$(CONFIG_HISI_ACC_VFIO_PCI) += hisilicon/
obj-$(CONFIG_PDS_VFIO_PCI) += pds/
obj-$(CONFIG_VIRTIO_VFIO_PCI) += virtio/
+
+obj-$(CONFIG_QAT_VFIO_PCI) += intel/qat/
diff --git a/drivers/vfio/pci/intel/qat/Kconfig b/drivers/vfio/pci/intel/qat/Kconfig
new file mode 100644
index 000000000000..bf52cfa4b595
--- /dev/null
+++ b/drivers/vfio/pci/intel/qat/Kconfig
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config QAT_VFIO_PCI
+ tristate "VFIO support for QAT VF PCI devices"
+ select VFIO_PCI_CORE
+ depends on CRYPTO_DEV_QAT_4XXX
+ help
+ This provides migration support for Intel(R) QAT Virtual Function
+ using the VFIO framework.
+
+ To compile this as a module, choose M here: the module
+ will be called qat_vfio_pci. If you don't know what to do here,
+ say N.
diff --git a/drivers/vfio/pci/intel/qat/Makefile b/drivers/vfio/pci/intel/qat/Makefile
new file mode 100644
index 000000000000..5fe5c4ec19d3
--- /dev/null
+++ b/drivers/vfio/pci/intel/qat/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_QAT_VFIO_PCI) += qat_vfio_pci.o
+qat_vfio_pci-y := main.o
diff --git a/drivers/vfio/pci/intel/qat/main.c b/drivers/vfio/pci/intel/qat/main.c
new file mode 100644
index 000000000000..e349e19df771
--- /dev/null
+++ b/drivers/vfio/pci/intel/qat/main.c
@@ -0,0 +1,688 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright(c) 2024 Intel Corporation */
+
+#include <linux/anon_inodes.h>
+#include <linux/container_of.h>
+#include <linux/device.h>
+#include <linux/file.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/pci.h>
+#include <linux/sizes.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/vfio_pci_core.h>
+#include <linux/qat/qat_mig_dev.h>
+
+struct qat_vf_migration_file {
+ struct file *filp;
+ /* protects migration region context */
+ struct mutex lock;
+ bool disabled;
+ struct qat_vf_core_device *qat_vdev;
+ ssize_t filled_size;
+};
+
+struct qat_vf_core_device {
+ struct vfio_pci_core_device core_device;
+ struct qat_mig_dev *mdev;
+ /* protects migration state */
+ struct mutex state_mutex;
+ enum vfio_device_mig_state mig_state;
+ /* protects reset down flow */
+ spinlock_t reset_lock;
+ bool deferred_reset;
+ struct qat_vf_migration_file *resuming_migf;
+ struct qat_vf_migration_file *saving_migf;
+};
+
+static void qat_vf_state_mutex_unlock(struct qat_vf_core_device *qat_vdev);
+
+static int qat_vf_pci_open_device(struct vfio_device *core_vdev)
+{
+ struct qat_vf_core_device *qat_vdev =
+ container_of(core_vdev, struct qat_vf_core_device,
+ core_device.vdev);
+ struct vfio_pci_core_device *vdev = &qat_vdev->core_device;
+ int ret;
+
+ ret = vfio_pci_core_enable(vdev);
+ if (ret)
+ return ret;
+
+ ret = qat_vfmig_open(qat_vdev->mdev);
+ if (ret) {
+ vfio_pci_core_disable(vdev);
+ return ret;
+ }
+ qat_vdev->mig_state = VFIO_DEVICE_STATE_RUNNING;
+
+ vfio_pci_core_finish_enable(vdev);
+
+ return 0;
+}
+
+static void qat_vf_disable_fd(struct qat_vf_migration_file *migf)
+{
+ mutex_lock(&migf->lock);
+ migf->disabled = true;
+ migf->filp->f_pos = 0;
+ migf->filled_size = 0;
+ mutex_unlock(&migf->lock);
+}
+
+static void qat_vf_disable_fds(struct qat_vf_core_device *qat_vdev)
+{
+ if (qat_vdev->resuming_migf) {
+ qat_vf_disable_fd(qat_vdev->resuming_migf);
+ fput(qat_vdev->resuming_migf->filp);
+ qat_vdev->resuming_migf = NULL;
+ }
+
+ if (qat_vdev->saving_migf) {
+ qat_vf_disable_fd(qat_vdev->saving_migf);
+ fput(qat_vdev->saving_migf->filp);
+ qat_vdev->saving_migf = NULL;
+ }
+}
+
+static void qat_vf_pci_close_device(struct vfio_device *core_vdev)
+{
+ struct qat_vf_core_device *qat_vdev = container_of(core_vdev,
+ struct qat_vf_core_device, core_device.vdev);
+
+ qat_vfmig_close(qat_vdev->mdev);
+ qat_vf_disable_fds(qat_vdev);
+ vfio_pci_core_close_device(core_vdev);
+}
+
+static long qat_vf_precopy_ioctl(struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ struct qat_vf_migration_file *migf = filp->private_data;
+ struct qat_vf_core_device *qat_vdev = migf->qat_vdev;
+ struct qat_mig_dev *mig_dev = qat_vdev->mdev;
+ loff_t *pos = &filp->f_pos;
+ struct vfio_precopy_info info;
+ unsigned long minsz;
+ int ret;
+
+ if (cmd != VFIO_MIG_GET_PRECOPY_INFO)
+ return -ENOTTY;
+
+ minsz = offsetofend(struct vfio_precopy_info, dirty_bytes);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ mutex_lock(&qat_vdev->state_mutex);
+ if (qat_vdev->mig_state != VFIO_DEVICE_STATE_PRE_COPY) {
+ qat_vf_state_mutex_unlock(qat_vdev);
+ return -EINVAL;
+ }
+
+ mutex_lock(&migf->lock);
+
+ if (migf->disabled) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ if (*pos > mig_dev->setup_size) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ info.dirty_bytes = 0;
+ info.initial_bytes = mig_dev->setup_size - *pos;
+
+ ret = copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
+out:
+ mutex_unlock(&migf->lock);
+ qat_vf_state_mutex_unlock(qat_vdev);
+ return ret;
+}
+
+static ssize_t qat_vf_save_read(struct file *filp, char __user *buf,
+ size_t len, loff_t *pos)
+{
+ struct qat_vf_migration_file *migf = filp->private_data;
+ struct qat_mig_dev *mig_dev = migf->qat_vdev->mdev;
+ ssize_t done = 0;
+ loff_t *offs;
+ int ret;
+
+ if (pos)
+ return -ESPIPE;
+ offs = &filp->f_pos;
+
+ mutex_lock(&migf->lock);
+ if (*offs > migf->filled_size || *offs < 0) {
+ done = -EINVAL;
+ goto out_unlock;
+ }
+
+ if (migf->disabled) {
+ done = -ENODEV;
+ goto out_unlock;
+ }
+
+ len = min_t(size_t, migf->filled_size - *offs, len);
+ if (len) {
+ ret = copy_to_user(buf, mig_dev->state + *offs, len);
+ if (ret) {
+ done = -EFAULT;
+ goto out_unlock;
+ }
+ *offs += len;
+ done = len;
+ }
+
+out_unlock:
+ mutex_unlock(&migf->lock);
+ return done;
+}
+
+static int qat_vf_release_file(struct inode *inode, struct file *filp)
+{
+ struct qat_vf_migration_file *migf = filp->private_data;
+
+ qat_vf_disable_fd(migf);
+ mutex_destroy(&migf->lock);
+ kfree(migf);
+
+ return 0;
+}
+
+static const struct file_operations qat_vf_save_fops = {
+ .owner = THIS_MODULE,
+ .read = qat_vf_save_read,
+ .unlocked_ioctl = qat_vf_precopy_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
+ .release = qat_vf_release_file,
+ .llseek = no_llseek,
+};
+
+static int qat_vf_save_state(struct qat_vf_core_device *qat_vdev,
+ struct qat_vf_migration_file *migf)
+{
+ int ret;
+
+ ret = qat_vfmig_save_state(qat_vdev->mdev);
+ if (ret)
+ return ret;
+ migf->filled_size = qat_vdev->mdev->state_size;
+
+ return 0;
+}
+
+static int qat_vf_save_setup(struct qat_vf_core_device *qat_vdev,
+ struct qat_vf_migration_file *migf)
+{
+ int ret;
+
+ ret = qat_vfmig_save_setup(qat_vdev->mdev);
+ if (ret)
+ return ret;
+ migf->filled_size = qat_vdev->mdev->setup_size;
+
+ return 0;
+}
+
+static struct qat_vf_migration_file *
+qat_vf_save_device_data(struct qat_vf_core_device *qat_vdev, bool pre_copy)
+{
+ struct qat_vf_migration_file *migf;
+ int ret;
+
+ migf = kzalloc(sizeof(*migf), GFP_KERNEL);
+ if (!migf)
+ return ERR_PTR(-ENOMEM);
+
+ migf->filp = anon_inode_getfile("qat_vf_mig", &qat_vf_save_fops,
+ migf, O_RDONLY);
+ ret = PTR_ERR_OR_ZERO(migf->filp);
+ if (ret) {
+ kfree(migf);
+ return ERR_PTR(ret);
+ }
+
+ stream_open(migf->filp->f_inode, migf->filp);
+ mutex_init(&migf->lock);
+
+ if (pre_copy)
+ ret = qat_vf_save_setup(qat_vdev, migf);
+ else
+ ret = qat_vf_save_state(qat_vdev, migf);
+ if (ret) {
+ fput(migf->filp);
+ return ERR_PTR(ret);
+ }
+
+ migf->qat_vdev = qat_vdev;
+
+ return migf;
+}
+
+static ssize_t qat_vf_resume_write(struct file *filp, const char __user *buf,
+ size_t len, loff_t *pos)
+{
+ struct qat_vf_migration_file *migf = filp->private_data;
+ struct qat_mig_dev *mig_dev = migf->qat_vdev->mdev;
+ loff_t end, *offs;
+ ssize_t done = 0;
+ int ret;
+
+ if (pos)
+ return -ESPIPE;
+ offs = &filp->f_pos;
+
+ if (*offs < 0 ||
+ check_add_overflow((loff_t)len, *offs, &end))
+ return -EOVERFLOW;
+
+ if (end > mig_dev->state_size)
+ return -ENOMEM;
+
+ mutex_lock(&migf->lock);
+ if (migf->disabled) {
+ done = -ENODEV;
+ goto out_unlock;
+ }
+
+ ret = copy_from_user(mig_dev->state + *offs, buf, len);
+ if (ret) {
+ done = -EFAULT;
+ goto out_unlock;
+ }
+ *offs += len;
+ migf->filled_size += len;
+
+ ret = qat_vfmig_load_setup(mig_dev, migf->filled_size);
+ if (ret && ret != -EAGAIN) {
+ done = ret;
+ goto out_unlock;
+ }
+ done = len;
+
+out_unlock:
+ mutex_unlock(&migf->lock);
+ return done;
+}
+
+static const struct file_operations qat_vf_resume_fops = {
+ .owner = THIS_MODULE,
+ .write = qat_vf_resume_write,
+ .release = qat_vf_release_file,
+ .llseek = no_llseek,
+};
+
+static struct qat_vf_migration_file *
+qat_vf_resume_device_data(struct qat_vf_core_device *qat_vdev)
+{
+ struct qat_vf_migration_file *migf;
+ int ret;
+
+ migf = kzalloc(sizeof(*migf), GFP_KERNEL);
+ if (!migf)
+ return ERR_PTR(-ENOMEM);
+
+ migf->filp = anon_inode_getfile("qat_vf_mig", &qat_vf_resume_fops, migf, O_WRONLY);
+ ret = PTR_ERR_OR_ZERO(migf->filp);
+ if (ret) {
+ kfree(migf);
+ return ERR_PTR(ret);
+ }
+
+ migf->qat_vdev = qat_vdev;
+ migf->filled_size = 0;
+ stream_open(migf->filp->f_inode, migf->filp);
+ mutex_init(&migf->lock);
+
+ return migf;
+}
+
+static int qat_vf_load_device_data(struct qat_vf_core_device *qat_vdev)
+{
+ return qat_vfmig_load_state(qat_vdev->mdev);
+}
+
+static struct file *qat_vf_pci_step_device_state(struct qat_vf_core_device *qat_vdev, u32 new)
+{
+ u32 cur = qat_vdev->mig_state;
+ int ret;
+
+ if ((cur == VFIO_DEVICE_STATE_RUNNING && new == VFIO_DEVICE_STATE_RUNNING_P2P) ||
+ (cur == VFIO_DEVICE_STATE_PRE_COPY && new == VFIO_DEVICE_STATE_PRE_COPY_P2P)) {
+ ret = qat_vfmig_suspend(qat_vdev->mdev);
+ if (ret)
+ return ERR_PTR(ret);
+ return NULL;
+ }
+
+ if ((cur == VFIO_DEVICE_STATE_RUNNING_P2P && new == VFIO_DEVICE_STATE_STOP) ||
+ (cur == VFIO_DEVICE_STATE_STOP && new == VFIO_DEVICE_STATE_RUNNING_P2P))
+ return NULL;
+
+ if (cur == VFIO_DEVICE_STATE_STOP && new == VFIO_DEVICE_STATE_STOP_COPY) {
+ struct qat_vf_migration_file *migf;
+
+ migf = qat_vf_save_device_data(qat_vdev, false);
+ if (IS_ERR(migf))
+ return ERR_CAST(migf);
+ get_file(migf->filp);
+ qat_vdev->saving_migf = migf;
+ return migf->filp;
+ }
+
+ if (cur == VFIO_DEVICE_STATE_PRE_COPY_P2P && new == VFIO_DEVICE_STATE_STOP_COPY) {
+ struct qat_vf_migration_file *migf = qat_vdev->saving_migf;
+
+ if (!migf)
+ return ERR_PTR(-EINVAL);
+ ret = qat_vf_save_state(qat_vdev, migf);
+ if (ret)
+ return ERR_PTR(ret);
+ return NULL;
+ }
+
+ if ((cur == VFIO_DEVICE_STATE_STOP_COPY && new == VFIO_DEVICE_STATE_STOP) ||
+ (cur == VFIO_DEVICE_STATE_PRE_COPY && new == VFIO_DEVICE_STATE_RUNNING) ||
+ (cur == VFIO_DEVICE_STATE_PRE_COPY_P2P && new == VFIO_DEVICE_STATE_RUNNING_P2P)) {
+ qat_vf_disable_fds(qat_vdev);
+ return NULL;
+ }
+
+ if (cur == VFIO_DEVICE_STATE_STOP && new == VFIO_DEVICE_STATE_RESUMING) {
+ struct qat_vf_migration_file *migf;
+
+ migf = qat_vf_resume_device_data(qat_vdev);
+ if (IS_ERR(migf))
+ return ERR_CAST(migf);
+ get_file(migf->filp);
+ qat_vdev->resuming_migf = migf;
+ return migf->filp;
+ }
+
+ if (cur == VFIO_DEVICE_STATE_RESUMING && new == VFIO_DEVICE_STATE_STOP) {
+ ret = qat_vf_load_device_data(qat_vdev);
+ if (ret)
+ return ERR_PTR(ret);
+
+ qat_vf_disable_fds(qat_vdev);
+ return NULL;
+ }
+
+ if ((cur == VFIO_DEVICE_STATE_RUNNING && new == VFIO_DEVICE_STATE_PRE_COPY) ||
+ (cur == VFIO_DEVICE_STATE_RUNNING_P2P && new == VFIO_DEVICE_STATE_PRE_COPY_P2P)) {
+ struct qat_vf_migration_file *migf;
+
+ migf = qat_vf_save_device_data(qat_vdev, true);
+ if (IS_ERR(migf))
+ return ERR_CAST(migf);
+ get_file(migf->filp);
+ qat_vdev->saving_migf = migf;
+ return migf->filp;
+ }
+
+ if ((cur == VFIO_DEVICE_STATE_RUNNING_P2P && new == VFIO_DEVICE_STATE_RUNNING) ||
+ (cur == VFIO_DEVICE_STATE_PRE_COPY_P2P && new == VFIO_DEVICE_STATE_PRE_COPY)) {
+ qat_vfmig_resume(qat_vdev->mdev);
+ return NULL;
+ }
+
+ /* vfio_mig_get_next_state() does not use arcs other than the above */
+ WARN_ON(true);
+ return ERR_PTR(-EINVAL);
+}
+
+static void qat_vf_state_mutex_unlock(struct qat_vf_core_device *qat_vdev)
+{
+again:
+ spin_lock(&qat_vdev->reset_lock);
+ if (qat_vdev->deferred_reset) {
+ qat_vdev->deferred_reset = false;
+ spin_unlock(&qat_vdev->reset_lock);
+ qat_vdev->mig_state = VFIO_DEVICE_STATE_RUNNING;
+ qat_vfmig_reset(qat_vdev->mdev);
+ qat_vf_disable_fds(qat_vdev);
+ goto again;
+ }
+ mutex_unlock(&qat_vdev->state_mutex);
+ spin_unlock(&qat_vdev->reset_lock);
+}
+
+static struct file *qat_vf_pci_set_device_state(struct vfio_device *vdev,
+ enum vfio_device_mig_state new_state)
+{
+ struct qat_vf_core_device *qat_vdev = container_of(vdev,
+ struct qat_vf_core_device, core_device.vdev);
+ enum vfio_device_mig_state next_state;
+ struct file *res = NULL;
+ int ret;
+
+ mutex_lock(&qat_vdev->state_mutex);
+ while (new_state != qat_vdev->mig_state) {
+ ret = vfio_mig_get_next_state(vdev, qat_vdev->mig_state,
+ new_state, &next_state);
+ if (ret) {
+ res = ERR_PTR(ret);
+ break;
+ }
+ res = qat_vf_pci_step_device_state(qat_vdev, next_state);
+ if (IS_ERR(res))
+ break;
+ qat_vdev->mig_state = next_state;
+ if (WARN_ON(res && new_state != qat_vdev->mig_state)) {
+ fput(res);
+ res = ERR_PTR(-EINVAL);
+ break;
+ }
+ }
+ qat_vf_state_mutex_unlock(qat_vdev);
+
+ return res;
+}
+
+static int qat_vf_pci_get_device_state(struct vfio_device *vdev,
+ enum vfio_device_mig_state *curr_state)
+{
+ struct qat_vf_core_device *qat_vdev = container_of(vdev,
+ struct qat_vf_core_device, core_device.vdev);
+
+ mutex_lock(&qat_vdev->state_mutex);
+ *curr_state = qat_vdev->mig_state;
+ qat_vf_state_mutex_unlock(qat_vdev);
+
+ return 0;
+}
+
+static int qat_vf_pci_get_data_size(struct vfio_device *vdev,
+ unsigned long *stop_copy_length)
+{
+ struct qat_vf_core_device *qat_vdev = container_of(vdev,
+ struct qat_vf_core_device, core_device.vdev);
+
+ mutex_lock(&qat_vdev->state_mutex);
+ *stop_copy_length = qat_vdev->mdev->state_size;
+ qat_vf_state_mutex_unlock(qat_vdev);
+
+ return 0;
+}
+
+static const struct vfio_migration_ops qat_vf_pci_mig_ops = {
+ .migration_set_state = qat_vf_pci_set_device_state,
+ .migration_get_state = qat_vf_pci_get_device_state,
+ .migration_get_data_size = qat_vf_pci_get_data_size,
+};
+
+static void qat_vf_pci_release_dev(struct vfio_device *core_vdev)
+{
+ struct qat_vf_core_device *qat_vdev = container_of(core_vdev,
+ struct qat_vf_core_device, core_device.vdev);
+
+ qat_vfmig_cleanup(qat_vdev->mdev);
+ qat_vfmig_destroy(qat_vdev->mdev);
+ mutex_destroy(&qat_vdev->state_mutex);
+ vfio_pci_core_release_dev(core_vdev);
+}
+
+static int qat_vf_pci_init_dev(struct vfio_device *core_vdev)
+{
+ struct qat_vf_core_device *qat_vdev = container_of(core_vdev,
+ struct qat_vf_core_device, core_device.vdev);
+ struct qat_mig_dev *mdev;
+ struct pci_dev *parent;
+ int ret, vf_id;
+
+ core_vdev->migration_flags = VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P |
+ VFIO_MIGRATION_PRE_COPY;
+ core_vdev->mig_ops = &qat_vf_pci_mig_ops;
+
+ ret = vfio_pci_core_init_dev(core_vdev);
+ if (ret)
+ return ret;
+
+ mutex_init(&qat_vdev->state_mutex);
+ spin_lock_init(&qat_vdev->reset_lock);
+
+ parent = pci_physfn(qat_vdev->core_device.pdev);
+ vf_id = pci_iov_vf_id(qat_vdev->core_device.pdev);
+ if (vf_id < 0) {
+ ret = -ENODEV;
+ goto err_rel;
+ }
+
+ mdev = qat_vfmig_create(parent, vf_id);
+ if (IS_ERR(mdev)) {
+ ret = PTR_ERR(mdev);
+ goto err_rel;
+ }
+
+ ret = qat_vfmig_init(mdev);
+ if (ret)
+ goto err_destroy;
+
+ qat_vdev->mdev = mdev;
+
+ return 0;
+
+err_destroy:
+ qat_vfmig_destroy(mdev);
+err_rel:
+ vfio_pci_core_release_dev(core_vdev);
+ return ret;
+}
+
+static const struct vfio_device_ops qat_vf_pci_ops = {
+ .name = "qat-vf-vfio-pci",
+ .init = qat_vf_pci_init_dev,
+ .release = qat_vf_pci_release_dev,
+ .open_device = qat_vf_pci_open_device,
+ .close_device = qat_vf_pci_close_device,
+ .ioctl = vfio_pci_core_ioctl,
+ .read = vfio_pci_core_read,
+ .write = vfio_pci_core_write,
+ .mmap = vfio_pci_core_mmap,
+ .request = vfio_pci_core_request,
+ .match = vfio_pci_core_match,
+ .bind_iommufd = vfio_iommufd_physical_bind,
+ .unbind_iommufd = vfio_iommufd_physical_unbind,
+ .attach_ioas = vfio_iommufd_physical_attach_ioas,
+ .detach_ioas = vfio_iommufd_physical_detach_ioas,
+};
+
+static struct qat_vf_core_device *qat_vf_drvdata(struct pci_dev *pdev)
+{
+ struct vfio_pci_core_device *core_device = pci_get_drvdata(pdev);
+
+ return container_of(core_device, struct qat_vf_core_device, core_device);
+}
+
+static void qat_vf_pci_aer_reset_done(struct pci_dev *pdev)
+{
+ struct qat_vf_core_device *qat_vdev = qat_vf_drvdata(pdev);
+
+ if (!qat_vdev->core_device.vdev.mig_ops)
+ return;
+
+ /*
+ * As the higher VFIO layers are holding locks across reset and using
+ * those same locks with the mm_lock we need to prevent ABBA deadlock
+ * with the state_mutex and mm_lock.
+ * In case the state_mutex was taken already we defer the cleanup work
+ * to the unlock flow of the other running context.
+ */
+ spin_lock(&qat_vdev->reset_lock);
+ qat_vdev->deferred_reset = true;
+ if (!mutex_trylock(&qat_vdev->state_mutex)) {
+ spin_unlock(&qat_vdev->reset_lock);
+ return;
+ }
+ spin_unlock(&qat_vdev->reset_lock);
+ qat_vf_state_mutex_unlock(qat_vdev);
+}
+
+static int
+qat_vf_vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct device *dev = &pdev->dev;
+ struct qat_vf_core_device *qat_vdev;
+ int ret;
+
+ qat_vdev = vfio_alloc_device(qat_vf_core_device, core_device.vdev, dev, &qat_vf_pci_ops);
+ if (IS_ERR(qat_vdev))
+ return PTR_ERR(qat_vdev);
+
+ pci_set_drvdata(pdev, &qat_vdev->core_device);
+ ret = vfio_pci_core_register_device(&qat_vdev->core_device);
+ if (ret)
+ goto out_put_device;
+
+ return 0;
+
+out_put_device:
+ vfio_put_device(&qat_vdev->core_device.vdev);
+ return ret;
+}
+
+static void qat_vf_vfio_pci_remove(struct pci_dev *pdev)
+{
+ struct qat_vf_core_device *qat_vdev = qat_vf_drvdata(pdev);
+
+ vfio_pci_core_unregister_device(&qat_vdev->core_device);
+ vfio_put_device(&qat_vdev->core_device.vdev);
+}
+
+static const struct pci_device_id qat_vf_vfio_pci_table[] = {
+ /* Intel QAT GEN4 4xxx VF device */
+ { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, 0x4941) },
+ { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, 0x4943) },
+ { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, 0x4945) },
+ {}
+};
+MODULE_DEVICE_TABLE(pci, qat_vf_vfio_pci_table);
+
+static const struct pci_error_handlers qat_vf_err_handlers = {
+ .reset_done = qat_vf_pci_aer_reset_done,
+ .error_detected = vfio_pci_core_aer_err_detected,
+};
+
+static struct pci_driver qat_vf_vfio_pci_driver = {
+ .name = "qat_vfio_pci",
+ .id_table = qat_vf_vfio_pci_table,
+ .probe = qat_vf_vfio_pci_probe,
+ .remove = qat_vf_vfio_pci_remove,
+ .err_handler = &qat_vf_err_handlers,
+ .driver_managed_dma = true,
+};
+module_pci_driver(qat_vf_vfio_pci_driver)
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("QAT VFIO PCI - VFIO PCI driver with live migration support for Intel(R) QAT GEN4 device family");
+MODULE_IMPORT_NS(CRYPTO_QAT);
--
2.18.2
