/* State of each mdev device */
struct mdev_state {
struct vfio_device vdev;
- int irq_fd;
struct eventfd_ctx *intx_evtfd;
struct eventfd_ctx *msi_evtfd;
int irq_index;
struct mutex rxtx_lock;
struct vfio_device_info dev_info;
int nr_ports;
+ u8 intx_mask:1;
};
static struct mtty_type {
static const struct vfio_device_ops mtty_dev_ops;
-/* function prototypes */
-
-static int mtty_trigger_interrupt(struct mdev_state *mdev_state);
-
/* Helper functions */
static void dump_buffer(u8 *buf, uint32_t count)
#endif
}
+static bool is_intx(struct mdev_state *mdev_state)
+{
+ return mdev_state->irq_index == VFIO_PCI_INTX_IRQ_INDEX;
+}
+
+static bool is_msi(struct mdev_state *mdev_state)
+{
+ return mdev_state->irq_index == VFIO_PCI_MSI_IRQ_INDEX;
+}
+
+static bool is_noirq(struct mdev_state *mdev_state)
+{
+ return !is_intx(mdev_state) && !is_msi(mdev_state);
+}
+
+static void mtty_trigger_interrupt(struct mdev_state *mdev_state)
+{
+ lockdep_assert_held(&mdev_state->ops_lock);
+
+ if (is_msi(mdev_state)) {
+ if (mdev_state->msi_evtfd)
+ eventfd_signal(mdev_state->msi_evtfd, 1);
+ } else if (is_intx(mdev_state)) {
+ if (mdev_state->intx_evtfd && !mdev_state->intx_mask) {
+ eventfd_signal(mdev_state->intx_evtfd, 1);
+ mdev_state->intx_mask = true;
+ }
+ }
+}
+
static void mtty_create_config_space(struct mdev_state *mdev_state)
{
/* PCI dev ID */
return -EFAULT;
}
+static void mtty_disable_intx(struct mdev_state *mdev_state)
+{
+ if (mdev_state->intx_evtfd) {
+ eventfd_ctx_put(mdev_state->intx_evtfd);
+ mdev_state->intx_evtfd = NULL;
+ mdev_state->intx_mask = false;
+ mdev_state->irq_index = -1;
+ }
+}
+
+static void mtty_disable_msi(struct mdev_state *mdev_state)
+{
+ if (mdev_state->msi_evtfd) {
+ eventfd_ctx_put(mdev_state->msi_evtfd);
+ mdev_state->msi_evtfd = NULL;
+ mdev_state->irq_index = -1;
+ }
+}
+
static int mtty_set_irqs(struct mdev_state *mdev_state, uint32_t flags,
unsigned int index, unsigned int start,
unsigned int count, void *data)
case VFIO_PCI_INTX_IRQ_INDEX:
switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
case VFIO_IRQ_SET_ACTION_MASK:
+ if (!is_intx(mdev_state) || start != 0 || count != 1) {
+ ret = -EINVAL;
+ break;
+ }
+
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ mdev_state->intx_mask = true;
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t mask = *(uint8_t *)data;
+
+ if (mask)
+ mdev_state->intx_mask = true;
+ } else if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
+ ret = -ENOTTY; /* No support for mask fd */
+ }
+ break;
case VFIO_IRQ_SET_ACTION_UNMASK:
+ if (!is_intx(mdev_state) || start != 0 || count != 1) {
+ ret = -EINVAL;
+ break;
+ }
+
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ mdev_state->intx_mask = false;
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t mask = *(uint8_t *)data;
+
+ if (mask)
+ mdev_state->intx_mask = false;
+ } else if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
+ ret = -ENOTTY; /* No support for unmask fd */
+ }
break;
case VFIO_IRQ_SET_ACTION_TRIGGER:
- {
- if (flags & VFIO_IRQ_SET_DATA_NONE) {
- pr_info("%s: disable INTx\n", __func__);
- if (mdev_state->intx_evtfd)
- eventfd_ctx_put(mdev_state->intx_evtfd);
+ if (is_intx(mdev_state) && !count &&
+ (flags & VFIO_IRQ_SET_DATA_NONE)) {
+ mtty_disable_intx(mdev_state);
+ break;
+ }
+
+ if (!(is_intx(mdev_state) || is_noirq(mdev_state)) ||
+ start != 0 || count != 1) {
+ ret = -EINVAL;
break;
}
if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
int fd = *(int *)data;
+ struct eventfd_ctx *evt;
+
+ mtty_disable_intx(mdev_state);
+
+ if (fd < 0)
+ break;
- if (fd > 0) {
- struct eventfd_ctx *evt;
-
- evt = eventfd_ctx_fdget(fd);
- if (IS_ERR(evt)) {
- ret = PTR_ERR(evt);
- break;
- }
- mdev_state->intx_evtfd = evt;
- mdev_state->irq_fd = fd;
- mdev_state->irq_index = index;
+ evt = eventfd_ctx_fdget(fd);
+ if (IS_ERR(evt)) {
+ ret = PTR_ERR(evt);
break;
}
+ mdev_state->intx_evtfd = evt;
+ mdev_state->irq_index = index;
+ break;
+ }
+
+ if (!is_intx(mdev_state)) {
+ ret = -EINVAL;
+ break;
+ }
+
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ mtty_trigger_interrupt(mdev_state);
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t trigger = *(uint8_t *)data;
+
+ if (trigger)
+ mtty_trigger_interrupt(mdev_state);
}
break;
}
- }
break;
case VFIO_PCI_MSI_IRQ_INDEX:
switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
case VFIO_IRQ_SET_ACTION_MASK:
case VFIO_IRQ_SET_ACTION_UNMASK:
+ ret = -ENOTTY;
break;
case VFIO_IRQ_SET_ACTION_TRIGGER:
- if (flags & VFIO_IRQ_SET_DATA_NONE) {
- if (mdev_state->msi_evtfd)
- eventfd_ctx_put(mdev_state->msi_evtfd);
- pr_info("%s: disable MSI\n", __func__);
- mdev_state->irq_index = VFIO_PCI_INTX_IRQ_INDEX;
+ if (is_msi(mdev_state) && !count &&
+ (flags & VFIO_IRQ_SET_DATA_NONE)) {
+ mtty_disable_msi(mdev_state);
break;
}
+
+ if (!(is_msi(mdev_state) || is_noirq(mdev_state)) ||
+ start != 0 || count != 1) {
+ ret = -EINVAL;
+ break;
+ }
+
if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
int fd = *(int *)data;
struct eventfd_ctx *evt;
- if (fd <= 0)
- break;
+ mtty_disable_msi(mdev_state);
- if (mdev_state->msi_evtfd)
+ if (fd < 0)
break;
evt = eventfd_ctx_fdget(fd);
break;
}
mdev_state->msi_evtfd = evt;
- mdev_state->irq_fd = fd;
mdev_state->irq_index = index;
+ break;
+ }
+
+ if (!is_msi(mdev_state)) {
+ ret = -EINVAL;
+ break;
+ }
+
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ mtty_trigger_interrupt(mdev_state);
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t trigger = *(uint8_t *)data;
+
+ if (trigger)
+ mtty_trigger_interrupt(mdev_state);
}
break;
- }
- break;
+ }
+ break;
case VFIO_PCI_MSIX_IRQ_INDEX:
- pr_info("%s: MSIX_IRQ\n", __func__);
+ dev_dbg(mdev_state->vdev.dev, "%s: MSIX_IRQ\n", __func__);
+ ret = -ENOTTY;
break;
case VFIO_PCI_ERR_IRQ_INDEX:
- pr_info("%s: ERR_IRQ\n", __func__);
+ dev_dbg(mdev_state->vdev.dev, "%s: ERR_IRQ\n", __func__);
+ ret = -ENOTTY;
break;
case VFIO_PCI_REQ_IRQ_INDEX:
- pr_info("%s: REQ_IRQ\n", __func__);
+ dev_dbg(mdev_state->vdev.dev, "%s: REQ_IRQ\n", __func__);
+ ret = -ENOTTY;
break;
}
return ret;
}
-static int mtty_trigger_interrupt(struct mdev_state *mdev_state)
-{
- int ret = -1;
-
- if ((mdev_state->irq_index == VFIO_PCI_MSI_IRQ_INDEX) &&
- (!mdev_state->msi_evtfd))
- return -EINVAL;
- else if ((mdev_state->irq_index == VFIO_PCI_INTX_IRQ_INDEX) &&
- (!mdev_state->intx_evtfd)) {
- pr_info("%s: Intr eventfd not found\n", __func__);
- return -EINVAL;
- }
-
- if (mdev_state->irq_index == VFIO_PCI_MSI_IRQ_INDEX)
- ret = eventfd_signal(mdev_state->msi_evtfd, 1);
- else
- ret = eventfd_signal(mdev_state->intx_evtfd, 1);
-
-#if defined(DEBUG_INTR)
- pr_info("Intx triggered\n");
-#endif
- if (ret != 1)
- pr_err("%s: eventfd signal failed (%d)\n", __func__, ret);
-
- return ret;
-}
-
static int mtty_get_region_info(struct mdev_state *mdev_state,
struct vfio_region_info *region_info,
u16 *cap_type_id, void **cap_type)
static int mtty_get_irq_info(struct vfio_irq_info *irq_info)
{
- switch (irq_info->index) {
- case VFIO_PCI_INTX_IRQ_INDEX:
- case VFIO_PCI_MSI_IRQ_INDEX:
- case VFIO_PCI_REQ_IRQ_INDEX:
- break;
-
- default:
+ if (irq_info->index != VFIO_PCI_INTX_IRQ_INDEX &&
+ irq_info->index != VFIO_PCI_MSI_IRQ_INDEX)
return -EINVAL;
- }
irq_info->flags = VFIO_IRQ_INFO_EVENTFD;
irq_info->count = 1;
if (irq_info->index == VFIO_PCI_INTX_IRQ_INDEX)
- irq_info->flags |= (VFIO_IRQ_INFO_MASKABLE |
- VFIO_IRQ_INFO_AUTOMASKED);
+ irq_info->flags |= VFIO_IRQ_INFO_MASKABLE |
+ VFIO_IRQ_INFO_AUTOMASKED;
else
irq_info->flags |= VFIO_IRQ_INFO_NORESIZE;
return atomic_read(&mdev_avail_ports) / type->nr_ports;
}
+static void mtty_close(struct vfio_device *vdev)
+{
+ struct mdev_state *mdev_state =
+ container_of(vdev, struct mdev_state, vdev);
+
+ mtty_disable_intx(mdev_state);
+ mtty_disable_msi(mdev_state);
+}
+
static const struct vfio_device_ops mtty_dev_ops = {
.name = "vfio-mtty",
.init = mtty_init_dev,
.unbind_iommufd = vfio_iommufd_emulated_unbind,
.attach_ioas = vfio_iommufd_emulated_attach_ioas,
.detach_ioas = vfio_iommufd_emulated_detach_ioas,
+ .close_device = mtty_close,
};
static struct mdev_driver mtty_driver = {
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