hisi_acc_vfio_pci: add new vfio_pci driver for HiSilicon ACC devices

Add a vendor-specific vfio_pci driver for HiSilicon ACC devices.
This will be extended in subsequent patches to add support for VFIO
live migration feature.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20220308184902.2242-5-shameerali.kolothum.thodi@huawei.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

diff --git a/MAINTAINERS b/MAINTAINERS
index 4322b53..48e09ca 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20305,6 +20305,13 @@ L:     kvm@vger.kernel.org
 S:     Maintained
 F:     drivers/vfio/fsl-mc/
 
+VFIO HISILICON PCI DRIVER
+M:     Longfang Liu <liulongfang@huawei.com>
+M:     Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
+L:     kvm@vger.kernel.org
+S:     Maintained
+F:     drivers/vfio/pci/hisilicon/
+
 VFIO MEDIATED DEVICE DRIVERS
 M:     Kirti Wankhede <kwankhede@nvidia.com>
 L:     kvm@vger.kernel.org

diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
index 187b9c2..4da1914 100644 (file)
--- a/drivers/vfio/pci/Kconfig
+++ b/drivers/vfio/pci/Kconfig
@@ -46,4 +46,6 @@ endif
 
 source "drivers/vfio/pci/mlx5/Kconfig"
 
+source "drivers/vfio/pci/hisilicon/Kconfig"
+
 endif

diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile
index ed9d6f2..7052ebd 100644 (file)
--- a/drivers/vfio/pci/Makefile
+++ b/drivers/vfio/pci/Makefile
@@ -9,3 +9,5 @@ vfio-pci-$(CONFIG_VFIO_PCI_IGD) += vfio_pci_igd.o
 obj-$(CONFIG_VFIO_PCI) += vfio-pci.o
 
 obj-$(CONFIG_MLX5_VFIO_PCI)           += mlx5/
+
+obj-$(CONFIG_HISI_ACC_VFIO_PCI) += hisilicon/

diff --git a/drivers/vfio/pci/hisilicon/Kconfig b/drivers/vfio/pci/hisilicon/Kconfig
new file mode 100644 (file)
index 0000000..dc723ba
--- /dev/null
+++ b/drivers/vfio/pci/hisilicon/Kconfig
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config HISI_ACC_VFIO_PCI
+       tristate "VFIO PCI support for HiSilicon ACC devices"
+       depends on ARM64 || (COMPILE_TEST && 64BIT)
+       depends on VFIO_PCI_CORE
+       help
+         This provides generic PCI support for HiSilicon ACC devices
+         using the VFIO framework.
+
+         If you don't know what to do here, say N.

diff --git a/drivers/vfio/pci/hisilicon/Makefile b/drivers/vfio/pci/hisilicon/Makefile
new file mode 100644 (file)
index 0000000..c66b378
--- /dev/null
+++ b/drivers/vfio/pci/hisilicon/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_HISI_ACC_VFIO_PCI) += hisi-acc-vfio-pci.o
+hisi-acc-vfio-pci-y := hisi_acc_vfio_pci.o
+

diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
new file mode 100644 (file)
index 0000000..8129c34
--- /dev/null
+++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, HiSilicon Ltd.
+ */
+
+#include <linux/device.h>
+#include <linux/eventfd.h>
+#include <linux/file.h>
+#include <linux/hisi_acc_qm.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/vfio.h>
+#include <linux/vfio_pci_core.h>
+
+static int hisi_acc_vfio_pci_open_device(struct vfio_device *core_vdev)
+{
+       struct vfio_pci_core_device *vdev =
+               container_of(core_vdev, struct vfio_pci_core_device, vdev);
+       int ret;
+
+       ret = vfio_pci_core_enable(vdev);
+       if (ret)
+               return ret;
+
+       vfio_pci_core_finish_enable(vdev);
+
+       return 0;
+}
+
+static const struct vfio_device_ops hisi_acc_vfio_pci_ops = {
+       .name = "hisi-acc-vfio-pci",
+       .open_device = hisi_acc_vfio_pci_open_device,
+       .close_device = vfio_pci_core_close_device,
+       .ioctl = vfio_pci_core_ioctl,
+       .device_feature = vfio_pci_core_ioctl_feature,
+       .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,
+};
+
+static int hisi_acc_vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+       struct vfio_pci_core_device *vdev;
+       int ret;
+
+       vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
+       if (!vdev)
+               return -ENOMEM;
+
+       vfio_pci_core_init_device(vdev, pdev, &hisi_acc_vfio_pci_ops);
+
+       ret = vfio_pci_core_register_device(vdev);
+       if (ret)
+               goto out_free;
+
+       dev_set_drvdata(&pdev->dev, vdev);
+
+       return 0;
+
+out_free:
+       vfio_pci_core_uninit_device(vdev);
+       kfree(vdev);
+       return ret;
+}
+
+static void hisi_acc_vfio_pci_remove(struct pci_dev *pdev)
+{
+       struct vfio_pci_core_device *vdev = dev_get_drvdata(&pdev->dev);
+
+       vfio_pci_core_unregister_device(vdev);
+       vfio_pci_core_uninit_device(vdev);
+       kfree(vdev);
+}
+
+static const struct pci_device_id hisi_acc_vfio_pci_table[] = {
+       { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_HUAWEI, PCI_DEVICE_ID_HUAWEI_SEC_VF) },
+       { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_HUAWEI, PCI_DEVICE_ID_HUAWEI_HPRE_VF) },
+       { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_HUAWEI, PCI_DEVICE_ID_HUAWEI_ZIP_VF) },
+       { }
+};
+
+MODULE_DEVICE_TABLE(pci, hisi_acc_vfio_pci_table);
+
+static struct pci_driver hisi_acc_vfio_pci_driver = {
+       .name = KBUILD_MODNAME,
+       .id_table = hisi_acc_vfio_pci_table,
+       .probe = hisi_acc_vfio_pci_probe,
+       .remove = hisi_acc_vfio_pci_remove,
+       .err_handler = &vfio_pci_core_err_handlers,
+};
+
+module_pci_driver(hisi_acc_vfio_pci_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Liu Longfang <liulongfang@huawei.com>");
+MODULE_AUTHOR("Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>");
+MODULE_DESCRIPTION("HiSilicon VFIO PCI - Generic VFIO PCI driver for HiSilicon ACC device family");