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-rw-r--r--drivers/vfio/cdx/Kconfig17
-rw-r--r--drivers/vfio/cdx/Makefile8
-rw-r--r--drivers/vfio/cdx/main.c233
-rw-r--r--drivers/vfio/cdx/private.h28
4 files changed, 286 insertions, 0 deletions
diff --git a/drivers/vfio/cdx/Kconfig b/drivers/vfio/cdx/Kconfig
new file mode 100644
index 0000000000..e6de0a0caa
--- /dev/null
+++ b/drivers/vfio/cdx/Kconfig
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# VFIO CDX configuration
+#
+# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
+#
+
+config VFIO_CDX
+ tristate "VFIO support for CDX bus devices"
+ depends on CDX_BUS
+ select EVENTFD
+ help
+ Driver to enable VFIO support for the devices on CDX bus.
+ This is required to make use of CDX devices present in
+ the system using the VFIO framework.
+
+ If you don't know what to do here, say N.
diff --git a/drivers/vfio/cdx/Makefile b/drivers/vfio/cdx/Makefile
new file mode 100644
index 0000000000..cd4a2e6fe6
--- /dev/null
+++ b/drivers/vfio/cdx/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
+#
+
+obj-$(CONFIG_VFIO_CDX) += vfio-cdx.o
+
+vfio-cdx-objs := main.o
diff --git a/drivers/vfio/cdx/main.c b/drivers/vfio/cdx/main.c
new file mode 100644
index 0000000000..de56686581
--- /dev/null
+++ b/drivers/vfio/cdx/main.c
@@ -0,0 +1,233 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
+ */
+
+#include <linux/vfio.h>
+#include <linux/cdx/cdx_bus.h>
+
+#include "private.h"
+
+static int vfio_cdx_open_device(struct vfio_device *core_vdev)
+{
+ struct vfio_cdx_device *vdev =
+ container_of(core_vdev, struct vfio_cdx_device, vdev);
+ struct cdx_device *cdx_dev = to_cdx_device(core_vdev->dev);
+ int count = cdx_dev->res_count;
+ int i;
+
+ vdev->regions = kcalloc(count, sizeof(struct vfio_cdx_region),
+ GFP_KERNEL_ACCOUNT);
+ if (!vdev->regions)
+ return -ENOMEM;
+
+ for (i = 0; i < count; i++) {
+ struct resource *res = &cdx_dev->res[i];
+
+ vdev->regions[i].addr = res->start;
+ vdev->regions[i].size = resource_size(res);
+ vdev->regions[i].type = res->flags;
+ /*
+ * Only regions addressed with PAGE granularity may be
+ * MMAP'ed securely.
+ */
+ if (!(vdev->regions[i].addr & ~PAGE_MASK) &&
+ !(vdev->regions[i].size & ~PAGE_MASK))
+ vdev->regions[i].flags |=
+ VFIO_REGION_INFO_FLAG_MMAP;
+ vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ;
+ if (!(cdx_dev->res[i].flags & IORESOURCE_READONLY))
+ vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_WRITE;
+ }
+
+ return 0;
+}
+
+static void vfio_cdx_close_device(struct vfio_device *core_vdev)
+{
+ struct vfio_cdx_device *vdev =
+ container_of(core_vdev, struct vfio_cdx_device, vdev);
+
+ kfree(vdev->regions);
+ cdx_dev_reset(core_vdev->dev);
+}
+
+static int vfio_cdx_ioctl_get_info(struct vfio_cdx_device *vdev,
+ struct vfio_device_info __user *arg)
+{
+ unsigned long minsz = offsetofend(struct vfio_device_info, num_irqs);
+ struct cdx_device *cdx_dev = to_cdx_device(vdev->vdev.dev);
+ struct vfio_device_info info;
+
+ if (copy_from_user(&info, arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ info.flags = VFIO_DEVICE_FLAGS_CDX;
+ info.flags |= VFIO_DEVICE_FLAGS_RESET;
+
+ info.num_regions = cdx_dev->res_count;
+ info.num_irqs = 0;
+
+ return copy_to_user(arg, &info, minsz) ? -EFAULT : 0;
+}
+
+static int vfio_cdx_ioctl_get_region_info(struct vfio_cdx_device *vdev,
+ struct vfio_region_info __user *arg)
+{
+ unsigned long minsz = offsetofend(struct vfio_region_info, offset);
+ struct cdx_device *cdx_dev = to_cdx_device(vdev->vdev.dev);
+ struct vfio_region_info info;
+
+ if (copy_from_user(&info, arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ if (info.index >= cdx_dev->res_count)
+ return -EINVAL;
+
+ /* map offset to the physical address */
+ info.offset = vfio_cdx_index_to_offset(info.index);
+ info.size = vdev->regions[info.index].size;
+ info.flags = vdev->regions[info.index].flags;
+
+ return copy_to_user(arg, &info, minsz) ? -EFAULT : 0;
+}
+
+static long vfio_cdx_ioctl(struct vfio_device *core_vdev,
+ unsigned int cmd, unsigned long arg)
+{
+ struct vfio_cdx_device *vdev =
+ container_of(core_vdev, struct vfio_cdx_device, vdev);
+ void __user *uarg = (void __user *)arg;
+
+ switch (cmd) {
+ case VFIO_DEVICE_GET_INFO:
+ return vfio_cdx_ioctl_get_info(vdev, uarg);
+ case VFIO_DEVICE_GET_REGION_INFO:
+ return vfio_cdx_ioctl_get_region_info(vdev, uarg);
+ case VFIO_DEVICE_RESET:
+ return cdx_dev_reset(core_vdev->dev);
+ default:
+ return -ENOTTY;
+ }
+}
+
+static int vfio_cdx_mmap_mmio(struct vfio_cdx_region region,
+ struct vm_area_struct *vma)
+{
+ u64 size = vma->vm_end - vma->vm_start;
+ u64 pgoff, base;
+
+ pgoff = vma->vm_pgoff &
+ ((1U << (VFIO_CDX_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
+ base = pgoff << PAGE_SHIFT;
+
+ if (base + size > region.size)
+ return -EINVAL;
+
+ vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
+ vma->vm_page_prot = pgprot_device(vma->vm_page_prot);
+
+ return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+ size, vma->vm_page_prot);
+}
+
+static int vfio_cdx_mmap(struct vfio_device *core_vdev,
+ struct vm_area_struct *vma)
+{
+ struct vfio_cdx_device *vdev =
+ container_of(core_vdev, struct vfio_cdx_device, vdev);
+ struct cdx_device *cdx_dev = to_cdx_device(core_vdev->dev);
+ unsigned int index;
+
+ index = vma->vm_pgoff >> (VFIO_CDX_OFFSET_SHIFT - PAGE_SHIFT);
+
+ if (index >= cdx_dev->res_count)
+ return -EINVAL;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP))
+ return -EINVAL;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ) &&
+ (vma->vm_flags & VM_READ))
+ return -EPERM;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE) &&
+ (vma->vm_flags & VM_WRITE))
+ return -EPERM;
+
+ return vfio_cdx_mmap_mmio(vdev->regions[index], vma);
+}
+
+static const struct vfio_device_ops vfio_cdx_ops = {
+ .name = "vfio-cdx",
+ .open_device = vfio_cdx_open_device,
+ .close_device = vfio_cdx_close_device,
+ .ioctl = vfio_cdx_ioctl,
+ .mmap = vfio_cdx_mmap,
+ .bind_iommufd = vfio_iommufd_physical_bind,
+ .unbind_iommufd = vfio_iommufd_physical_unbind,
+ .attach_ioas = vfio_iommufd_physical_attach_ioas,
+};
+
+static int vfio_cdx_probe(struct cdx_device *cdx_dev)
+{
+ struct vfio_cdx_device *vdev;
+ struct device *dev = &cdx_dev->dev;
+ int ret;
+
+ vdev = vfio_alloc_device(vfio_cdx_device, vdev, dev,
+ &vfio_cdx_ops);
+ if (IS_ERR(vdev))
+ return PTR_ERR(vdev);
+
+ ret = vfio_register_group_dev(&vdev->vdev);
+ if (ret)
+ goto out_uninit;
+
+ dev_set_drvdata(dev, vdev);
+ return 0;
+
+out_uninit:
+ vfio_put_device(&vdev->vdev);
+ return ret;
+}
+
+static int vfio_cdx_remove(struct cdx_device *cdx_dev)
+{
+ struct device *dev = &cdx_dev->dev;
+ struct vfio_cdx_device *vdev = dev_get_drvdata(dev);
+
+ vfio_unregister_group_dev(&vdev->vdev);
+ vfio_put_device(&vdev->vdev);
+
+ return 0;
+}
+
+static const struct cdx_device_id vfio_cdx_table[] = {
+ { CDX_DEVICE_DRIVER_OVERRIDE(CDX_ANY_ID, CDX_ANY_ID,
+ CDX_ID_F_VFIO_DRIVER_OVERRIDE) }, /* match all by default */
+ {}
+};
+
+MODULE_DEVICE_TABLE(cdx, vfio_cdx_table);
+
+static struct cdx_driver vfio_cdx_driver = {
+ .probe = vfio_cdx_probe,
+ .remove = vfio_cdx_remove,
+ .match_id_table = vfio_cdx_table,
+ .driver = {
+ .name = "vfio-cdx",
+ },
+ .driver_managed_dma = true,
+};
+
+module_driver(vfio_cdx_driver, cdx_driver_register, cdx_driver_unregister);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("VFIO for CDX devices - User Level meta-driver");
diff --git a/drivers/vfio/cdx/private.h b/drivers/vfio/cdx/private.h
new file mode 100644
index 0000000000..8bdc117ea8
--- /dev/null
+++ b/drivers/vfio/cdx/private.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
+ */
+
+#ifndef VFIO_CDX_PRIVATE_H
+#define VFIO_CDX_PRIVATE_H
+
+#define VFIO_CDX_OFFSET_SHIFT 40
+
+static inline u64 vfio_cdx_index_to_offset(u32 index)
+{
+ return ((u64)(index) << VFIO_CDX_OFFSET_SHIFT);
+}
+
+struct vfio_cdx_region {
+ u32 flags;
+ u32 type;
+ u64 addr;
+ resource_size_t size;
+};
+
+struct vfio_cdx_device {
+ struct vfio_device vdev;
+ struct vfio_cdx_region *regions;
+};
+
+#endif /* VFIO_CDX_PRIVATE_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 01:47:33 +0000