436 lines
9.6 KiB
C
436 lines
9.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Physical device callbacks for vfio_ccw
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*
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* Copyright IBM Corp. 2017
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*
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* Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
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* Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
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*/
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#include <linux/vfio.h>
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#include <linux/mdev.h>
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#include "vfio_ccw_private.h"
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static int vfio_ccw_mdev_reset(struct mdev_device *mdev)
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{
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struct vfio_ccw_private *private;
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struct subchannel *sch;
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int ret;
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private = dev_get_drvdata(mdev_parent_dev(mdev));
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sch = private->sch;
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/*
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* TODO:
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* In the cureent stage, some things like "no I/O running" and "no
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* interrupt pending" are clear, but we are not sure what other state
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* we need to care about.
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* There are still a lot more instructions need to be handled. We
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* should come back here later.
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*/
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ret = vfio_ccw_sch_quiesce(sch);
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if (ret)
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return ret;
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ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
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if (!ret)
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private->state = VFIO_CCW_STATE_IDLE;
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return ret;
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}
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static int vfio_ccw_mdev_notifier(struct notifier_block *nb,
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unsigned long action,
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void *data)
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{
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struct vfio_ccw_private *private =
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container_of(nb, struct vfio_ccw_private, nb);
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/*
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* Vendor drivers MUST unpin pages in response to an
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* invalidation.
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*/
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if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) {
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struct vfio_iommu_type1_dma_unmap *unmap = data;
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if (!cp_iova_pinned(&private->cp, unmap->iova))
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return NOTIFY_OK;
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if (vfio_ccw_mdev_reset(private->mdev))
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return NOTIFY_BAD;
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cp_free(&private->cp);
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return NOTIFY_OK;
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}
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return NOTIFY_DONE;
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}
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static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)
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{
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return sprintf(buf, "I/O subchannel (Non-QDIO)\n");
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}
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static MDEV_TYPE_ATTR_RO(name);
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static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
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char *buf)
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{
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return sprintf(buf, "%s\n", VFIO_DEVICE_API_CCW_STRING);
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}
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static MDEV_TYPE_ATTR_RO(device_api);
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static ssize_t available_instances_show(struct kobject *kobj,
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struct device *dev, char *buf)
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{
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struct vfio_ccw_private *private = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", atomic_read(&private->avail));
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}
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static MDEV_TYPE_ATTR_RO(available_instances);
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static struct attribute *mdev_types_attrs[] = {
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&mdev_type_attr_name.attr,
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&mdev_type_attr_device_api.attr,
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&mdev_type_attr_available_instances.attr,
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NULL,
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};
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static struct attribute_group mdev_type_group = {
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.name = "io",
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.attrs = mdev_types_attrs,
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};
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static struct attribute_group *mdev_type_groups[] = {
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&mdev_type_group,
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NULL,
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};
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static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
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{
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struct vfio_ccw_private *private =
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dev_get_drvdata(mdev_parent_dev(mdev));
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if (private->state == VFIO_CCW_STATE_NOT_OPER)
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return -ENODEV;
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if (atomic_dec_if_positive(&private->avail) < 0)
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return -EPERM;
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private->mdev = mdev;
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private->state = VFIO_CCW_STATE_IDLE;
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return 0;
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}
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static int vfio_ccw_mdev_remove(struct mdev_device *mdev)
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{
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struct vfio_ccw_private *private =
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dev_get_drvdata(mdev_parent_dev(mdev));
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if ((private->state != VFIO_CCW_STATE_NOT_OPER) &&
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(private->state != VFIO_CCW_STATE_STANDBY)) {
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if (!vfio_ccw_sch_quiesce(private->sch))
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private->state = VFIO_CCW_STATE_STANDBY;
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/* The state will be NOT_OPER on error. */
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}
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cp_free(&private->cp);
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private->mdev = NULL;
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atomic_inc(&private->avail);
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return 0;
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}
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static int vfio_ccw_mdev_open(struct mdev_device *mdev)
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{
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struct vfio_ccw_private *private =
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dev_get_drvdata(mdev_parent_dev(mdev));
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unsigned long events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
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private->nb.notifier_call = vfio_ccw_mdev_notifier;
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return vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
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&events, &private->nb);
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}
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static void vfio_ccw_mdev_release(struct mdev_device *mdev)
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{
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struct vfio_ccw_private *private =
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dev_get_drvdata(mdev_parent_dev(mdev));
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if ((private->state != VFIO_CCW_STATE_NOT_OPER) &&
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(private->state != VFIO_CCW_STATE_STANDBY)) {
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if (!vfio_ccw_mdev_reset(mdev))
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private->state = VFIO_CCW_STATE_STANDBY;
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/* The state will be NOT_OPER on error. */
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}
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cp_free(&private->cp);
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vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
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&private->nb);
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}
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static ssize_t vfio_ccw_mdev_read(struct mdev_device *mdev,
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char __user *buf,
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size_t count,
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loff_t *ppos)
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{
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struct vfio_ccw_private *private;
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struct ccw_io_region *region;
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if (*ppos + count > sizeof(*region))
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return -EINVAL;
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private = dev_get_drvdata(mdev_parent_dev(mdev));
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region = private->io_region;
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if (copy_to_user(buf, (void *)region + *ppos, count))
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return -EFAULT;
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return count;
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}
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static ssize_t vfio_ccw_mdev_write(struct mdev_device *mdev,
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const char __user *buf,
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size_t count,
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loff_t *ppos)
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{
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struct vfio_ccw_private *private;
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struct ccw_io_region *region;
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if (*ppos + count > sizeof(*region))
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return -EINVAL;
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private = dev_get_drvdata(mdev_parent_dev(mdev));
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if (private->state != VFIO_CCW_STATE_IDLE)
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return -EACCES;
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region = private->io_region;
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if (copy_from_user((void *)region + *ppos, buf, count))
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return -EFAULT;
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vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_IO_REQ);
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if (region->ret_code != 0) {
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private->state = VFIO_CCW_STATE_IDLE;
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return region->ret_code;
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}
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return count;
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}
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static int vfio_ccw_mdev_get_device_info(struct vfio_device_info *info)
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{
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info->flags = VFIO_DEVICE_FLAGS_CCW | VFIO_DEVICE_FLAGS_RESET;
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info->num_regions = VFIO_CCW_NUM_REGIONS;
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info->num_irqs = VFIO_CCW_NUM_IRQS;
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return 0;
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}
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static int vfio_ccw_mdev_get_region_info(struct vfio_region_info *info,
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u16 *cap_type_id,
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void **cap_type)
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{
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switch (info->index) {
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case VFIO_CCW_CONFIG_REGION_INDEX:
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info->offset = 0;
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info->size = sizeof(struct ccw_io_region);
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info->flags = VFIO_REGION_INFO_FLAG_READ
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| VFIO_REGION_INFO_FLAG_WRITE;
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return 0;
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default:
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return -EINVAL;
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}
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}
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static int vfio_ccw_mdev_get_irq_info(struct vfio_irq_info *info)
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{
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if (info->index != VFIO_CCW_IO_IRQ_INDEX)
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return -EINVAL;
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info->count = 1;
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info->flags = VFIO_IRQ_INFO_EVENTFD;
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return 0;
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}
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static int vfio_ccw_mdev_set_irqs(struct mdev_device *mdev,
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uint32_t flags,
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void __user *data)
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{
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struct vfio_ccw_private *private;
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struct eventfd_ctx **ctx;
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if (!(flags & VFIO_IRQ_SET_ACTION_TRIGGER))
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return -EINVAL;
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private = dev_get_drvdata(mdev_parent_dev(mdev));
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ctx = &private->io_trigger;
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switch (flags & VFIO_IRQ_SET_DATA_TYPE_MASK) {
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case VFIO_IRQ_SET_DATA_NONE:
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{
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if (*ctx)
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eventfd_signal(*ctx, 1);
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return 0;
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}
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case VFIO_IRQ_SET_DATA_BOOL:
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{
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uint8_t trigger;
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if (get_user(trigger, (uint8_t __user *)data))
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return -EFAULT;
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if (trigger && *ctx)
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eventfd_signal(*ctx, 1);
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return 0;
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}
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case VFIO_IRQ_SET_DATA_EVENTFD:
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{
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int32_t fd;
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if (get_user(fd, (int32_t __user *)data))
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return -EFAULT;
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if (fd == -1) {
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if (*ctx)
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eventfd_ctx_put(*ctx);
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*ctx = NULL;
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} else if (fd >= 0) {
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struct eventfd_ctx *efdctx;
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efdctx = eventfd_ctx_fdget(fd);
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if (IS_ERR(efdctx))
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return PTR_ERR(efdctx);
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if (*ctx)
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eventfd_ctx_put(*ctx);
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*ctx = efdctx;
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} else
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return -EINVAL;
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return 0;
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}
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default:
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return -EINVAL;
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}
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}
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static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev,
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unsigned int cmd,
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unsigned long arg)
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{
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int ret = 0;
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unsigned long minsz;
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switch (cmd) {
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case VFIO_DEVICE_GET_INFO:
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{
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struct vfio_device_info info;
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minsz = offsetofend(struct vfio_device_info, num_irqs);
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if (copy_from_user(&info, (void __user *)arg, minsz))
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return -EFAULT;
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if (info.argsz < minsz)
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return -EINVAL;
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ret = vfio_ccw_mdev_get_device_info(&info);
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if (ret)
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return ret;
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return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
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}
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case VFIO_DEVICE_GET_REGION_INFO:
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{
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struct vfio_region_info info;
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u16 cap_type_id = 0;
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void *cap_type = NULL;
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minsz = offsetofend(struct vfio_region_info, offset);
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if (copy_from_user(&info, (void __user *)arg, minsz))
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return -EFAULT;
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if (info.argsz < minsz)
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return -EINVAL;
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ret = vfio_ccw_mdev_get_region_info(&info, &cap_type_id,
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&cap_type);
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if (ret)
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return ret;
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return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
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}
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case VFIO_DEVICE_GET_IRQ_INFO:
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{
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struct vfio_irq_info info;
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minsz = offsetofend(struct vfio_irq_info, count);
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if (copy_from_user(&info, (void __user *)arg, minsz))
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return -EFAULT;
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if (info.argsz < minsz || info.index >= VFIO_CCW_NUM_IRQS)
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return -EINVAL;
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ret = vfio_ccw_mdev_get_irq_info(&info);
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if (ret)
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return ret;
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if (info.count == -1)
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return -EINVAL;
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return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
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}
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case VFIO_DEVICE_SET_IRQS:
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{
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struct vfio_irq_set hdr;
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size_t data_size;
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void __user *data;
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minsz = offsetofend(struct vfio_irq_set, count);
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if (copy_from_user(&hdr, (void __user *)arg, minsz))
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return -EFAULT;
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ret = vfio_set_irqs_validate_and_prepare(&hdr, 1,
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VFIO_CCW_NUM_IRQS,
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&data_size);
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if (ret)
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return ret;
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data = (void __user *)(arg + minsz);
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return vfio_ccw_mdev_set_irqs(mdev, hdr.flags, data);
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}
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case VFIO_DEVICE_RESET:
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return vfio_ccw_mdev_reset(mdev);
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default:
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return -ENOTTY;
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}
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}
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static const struct mdev_parent_ops vfio_ccw_mdev_ops = {
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.owner = THIS_MODULE,
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.supported_type_groups = mdev_type_groups,
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.create = vfio_ccw_mdev_create,
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.remove = vfio_ccw_mdev_remove,
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.open = vfio_ccw_mdev_open,
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.release = vfio_ccw_mdev_release,
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.read = vfio_ccw_mdev_read,
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.write = vfio_ccw_mdev_write,
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.ioctl = vfio_ccw_mdev_ioctl,
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};
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int vfio_ccw_mdev_reg(struct subchannel *sch)
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{
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return mdev_register_device(&sch->dev, &vfio_ccw_mdev_ops);
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}
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void vfio_ccw_mdev_unreg(struct subchannel *sch)
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{
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mdev_unregister_device(&sch->dev);
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}
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