* Copyright Red Hat, Inc. 2012
*/
+#include "qemu/osdep.h"
+#include "qapi/error.h"
#include <sys/ioctl.h>
#include <linux/vfio.h>
* Functions used whatever the injection method
*/
+static inline bool vfio_irq_is_automasked(VFIOINTp *intp)
+{
+ return intp->flags & VFIO_IRQ_INFO_AUTOMASKED;
+}
+
/**
* vfio_init_intp - allocate, initialize the IRQ struct pointer
* and add it into the list of IRQs
* @vbasedev: the VFIO device handle
* @info: irq info struct retrieved from VFIO driver
+ * @errp: error object
*/
static VFIOINTp *vfio_init_intp(VFIODevice *vbasedev,
- struct vfio_irq_info info)
+ struct vfio_irq_info info, Error **errp)
{
int ret;
VFIOPlatformDevice *vdev =
sysbus_init_irq(sbdev, &intp->qemuirq);
/* Get an eventfd for trigger */
- ret = event_notifier_init(&intp->interrupt, 0);
+ intp->interrupt = g_malloc0(sizeof(EventNotifier));
+ ret = event_notifier_init(intp->interrupt, 0);
if (ret) {
+ g_free(intp->interrupt);
g_free(intp);
- error_report("vfio: Error: trigger event_notifier_init failed ");
+ error_setg_errno(errp, -ret,
+ "failed to initialize trigger eventd notifier");
return NULL;
}
- /* Get an eventfd for resample/unmask */
- ret = event_notifier_init(&intp->unmask, 0);
- if (ret) {
- g_free(intp);
- error_report("vfio: Error: resamplefd event_notifier_init failed");
- return NULL;
+ if (vfio_irq_is_automasked(intp)) {
+ /* Get an eventfd for resample/unmask */
+ intp->unmask = g_malloc0(sizeof(EventNotifier));
+ ret = event_notifier_init(intp->unmask, 0);
+ if (ret) {
+ g_free(intp->interrupt);
+ g_free(intp->unmask);
+ g_free(intp);
+ error_setg_errno(errp, -ret,
+ "failed to initialize resample eventd notifier");
+ return NULL;
+ }
}
QLIST_INSERT_HEAD(&vdev->intp_list, intp, next);
irq_set->start = 0;
irq_set->count = 1;
pfd = (int32_t *)&irq_set->data;
- *pfd = event_notifier_get_fd(&intp->interrupt);
+ *pfd = event_notifier_get_fd(intp->interrupt);
qemu_set_fd_handler(*pfd, (IOHandler *)handler, NULL, intp);
ret = ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
- g_free(irq_set);
if (ret < 0) {
error_report("vfio: Failed to set trigger eventfd: %m");
qemu_set_fd_handler(*pfd, NULL, NULL, NULL);
}
+ g_free(irq_set);
return ret;
}
{
int i;
- trace_vfio_platform_mmap_set_enabled(enabled);
-
for (i = 0; i < vdev->vbasedev.num_regions; i++) {
- VFIORegion *region = vdev->regions[i];
-
- memory_region_set_enabled(®ion->mmap_mem, enabled);
+ vfio_region_mmaps_set_enabled(vdev->regions[i], enabled);
}
}
static void vfio_intp_inject_pending_lockheld(VFIOINTp *intp)
{
trace_vfio_platform_intp_inject_pending_lockheld(intp->pin,
- event_notifier_get_fd(&intp->interrupt));
+ event_notifier_get_fd(intp->interrupt));
intp->state = VFIO_IRQ_ACTIVE;
trace_vfio_intp_interrupt_set_pending(intp->pin);
QSIMPLEQ_INSERT_TAIL(&vdev->pending_intp_queue,
intp, pqnext);
- ret = event_notifier_test_and_clear(&intp->interrupt);
+ ret = event_notifier_test_and_clear(intp->interrupt);
qemu_mutex_unlock(&vdev->intp_mutex);
return;
}
trace_vfio_platform_intp_interrupt(intp->pin,
- event_notifier_get_fd(&intp->interrupt));
+ event_notifier_get_fd(intp->interrupt));
- ret = event_notifier_test_and_clear(&intp->interrupt);
+ ret = event_notifier_test_and_clear(intp->interrupt);
if (!ret) {
error_report("Error when clearing fd=%d (ret = %d)",
- event_notifier_get_fd(&intp->interrupt), ret);
+ event_notifier_get_fd(intp->interrupt), ret);
}
intp->state = VFIO_IRQ_ACTIVE;
QLIST_FOREACH(intp, &vdev->intp_list, next) {
if (intp->state == VFIO_IRQ_ACTIVE) {
trace_vfio_platform_eoi(intp->pin,
- event_notifier_get_fd(&intp->interrupt));
+ event_notifier_get_fd(intp->interrupt));
intp->state = VFIO_IRQ_INACTIVE;
/* deassert the virtual IRQ */
qemu_set_irq(intp->qemuirq, 0);
- if (intp->flags & VFIO_IRQ_INFO_AUTOMASKED) {
+ if (vfio_irq_is_automasked(intp)) {
/* unmasks the physical level-sensitive IRQ */
vfio_unmask_single_irqindex(vbasedev, intp->pin);
}
/**
* vfio_start_eventfd_injection - starts the virtual IRQ injection using
* user-side handled eventfds
- * @intp: the IRQ struct pointer
+ * @sbdev: the sysbus device handle
+ * @irq: the qemu irq handle
*/
-static int vfio_start_eventfd_injection(VFIOINTp *intp)
+static void vfio_start_eventfd_injection(SysBusDevice *sbdev, qemu_irq irq)
{
int ret;
+ VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(sbdev);
+ VFIOINTp *intp;
+
+ QLIST_FOREACH(intp, &vdev->intp_list, next) {
+ if (intp->qemuirq == irq) {
+ break;
+ }
+ }
+ assert(intp);
ret = vfio_set_trigger_eventfd(intp, vfio_intp_interrupt);
if (ret) {
- error_report("vfio: Error: Failed to pass IRQ fd to the driver: %m");
+ error_report("vfio: failed to start eventfd signaling for IRQ %d: %m",
+ intp->pin);
+ abort();
}
- return ret;
}
/*
irq_set->start = 0;
irq_set->count = 1;
pfd = (int32_t *)&irq_set->data;
- *pfd = event_notifier_get_fd(&intp->unmask);
+ *pfd = event_notifier_get_fd(intp->unmask);
qemu_set_fd_handler(*pfd, NULL, NULL, NULL);
ret = ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
g_free(irq_set);
return ret;
}
+/**
+ * vfio_start_irqfd_injection - starts the virtual IRQ injection using
+ * irqfd
+ *
+ * @sbdev: the sysbus device handle
+ * @irq: the qemu irq handle
+ *
+ * In case the irqfd setup fails, we fallback to userspace handled eventfd
+ */
static void vfio_start_irqfd_injection(SysBusDevice *sbdev, qemu_irq irq)
{
VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(sbdev);
if (!kvm_irqfds_enabled() || !kvm_resamplefds_enabled() ||
!vdev->irqfd_allowed) {
- return;
+ goto fail_irqfd;
}
QLIST_FOREACH(intp, &vdev->intp_list, next) {
}
assert(intp);
- /* Get to a known interrupt state */
- qemu_set_fd_handler(event_notifier_get_fd(&intp->interrupt),
- NULL, NULL, vdev);
-
- vfio_mask_single_irqindex(&vdev->vbasedev, intp->pin);
- qemu_set_irq(intp->qemuirq, 0);
-
- if (kvm_irqchip_add_irqfd_notifier(kvm_state, &intp->interrupt,
- &intp->unmask, irq) < 0) {
+ if (kvm_irqchip_add_irqfd_notifier(kvm_state, intp->interrupt,
+ intp->unmask, irq) < 0) {
goto fail_irqfd;
}
if (vfio_set_trigger_eventfd(intp, NULL) < 0) {
goto fail_vfio;
}
- if (vfio_set_resample_eventfd(intp) < 0) {
- goto fail_vfio;
+ if (vfio_irq_is_automasked(intp)) {
+ if (vfio_set_resample_eventfd(intp) < 0) {
+ goto fail_vfio;
+ }
+ trace_vfio_platform_start_level_irqfd_injection(intp->pin,
+ event_notifier_get_fd(intp->interrupt),
+ event_notifier_get_fd(intp->unmask));
+ } else {
+ trace_vfio_platform_start_edge_irqfd_injection(intp->pin,
+ event_notifier_get_fd(intp->interrupt));
}
- /* Let's resume injection with irqfd setup */
- vfio_unmask_single_irqindex(&vdev->vbasedev, intp->pin);
-
intp->kvm_accel = true;
- trace_vfio_platform_start_irqfd_injection(intp->pin,
- event_notifier_get_fd(&intp->interrupt),
- event_notifier_get_fd(&intp->unmask));
return;
fail_vfio:
- kvm_irqchip_remove_irqfd_notifier(kvm_state, &intp->interrupt, irq);
+ kvm_irqchip_remove_irqfd_notifier(kvm_state, intp->interrupt, irq);
+ error_report("vfio: failed to start eventfd signaling for IRQ %d: %m",
+ intp->pin);
+ abort();
fail_irqfd:
- vfio_start_eventfd_injection(intp);
- vfio_unmask_single_irqindex(&vdev->vbasedev, intp->pin);
+ vfio_start_eventfd_injection(sbdev, irq);
return;
}
* vfio_populate_device - Allocate and populate MMIO region
* and IRQ structs according to driver returned information
* @vbasedev: the VFIO device handle
+ * @errp: error object
*
*/
-static int vfio_populate_device(VFIODevice *vbasedev)
+static int vfio_populate_device(VFIODevice *vbasedev, Error **errp)
{
VFIOINTp *intp, *tmp;
int i, ret = -1;
container_of(vbasedev, VFIOPlatformDevice, vbasedev);
if (!(vbasedev->flags & VFIO_DEVICE_FLAGS_PLATFORM)) {
- error_report("vfio: Um, this isn't a platform device");
+ error_setg(errp, "this isn't a platform device");
return ret;
}
vdev->regions = g_new0(VFIORegion *, vbasedev->num_regions);
for (i = 0; i < vbasedev->num_regions; i++) {
- struct vfio_region_info reg_info = { .argsz = sizeof(reg_info) };
- VFIORegion *ptr;
+ char *name = g_strdup_printf("VFIO %s region %d\n", vbasedev->name, i);
- vdev->regions[i] = g_malloc0(sizeof(VFIORegion));
- ptr = vdev->regions[i];
- reg_info.index = i;
- ret = ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, ®_info);
+ vdev->regions[i] = g_new0(VFIORegion, 1);
+ ret = vfio_region_setup(OBJECT(vdev), vbasedev,
+ vdev->regions[i], i, name);
+ g_free(name);
if (ret) {
- error_report("vfio: Error getting region %d info: %m", i);
+ error_setg_errno(errp, -ret, "failed to get region %d info", i);
goto reg_error;
}
- ptr->flags = reg_info.flags;
- ptr->size = reg_info.size;
- ptr->fd_offset = reg_info.offset;
- ptr->nr = i;
- ptr->vbasedev = vbasedev;
-
- trace_vfio_platform_populate_regions(ptr->nr,
- (unsigned long)ptr->flags,
- (unsigned long)ptr->size,
- ptr->vbasedev->fd,
- (unsigned long)ptr->fd_offset);
}
vdev->mmap_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
irq.index = i;
ret = ioctl(vbasedev->fd, VFIO_DEVICE_GET_IRQ_INFO, &irq);
if (ret) {
- error_printf("vfio: error getting device %s irq info",
- vbasedev->name);
+ error_setg_errno(errp, -ret, "failed to get device irq info");
goto irq_err;
} else {
trace_vfio_platform_populate_interrupts(irq.index,
irq.count,
irq.flags);
- intp = vfio_init_intp(vbasedev, irq);
+ intp = vfio_init_intp(vbasedev, irq, errp);
if (!intp) {
- error_report("vfio: Error installing IRQ %d up", i);
+ ret = -1;
goto irq_err;
}
}
}
reg_error:
for (i = 0; i < vbasedev->num_regions; i++) {
+ if (vdev->regions[i]) {
+ vfio_region_finalize(vdev->regions[i]);
+ }
g_free(vdev->regions[i]);
}
g_free(vdev->regions);
/**
* vfio_base_device_init - perform preliminary VFIO setup
* @vbasedev: the VFIO device handle
+ * @errp: error object
*
* Implement the VFIO command sequence that allows to discover
* assigned device resources: group extraction, device
* fd retrieval, resource query.
* Precondition: the device name must be initialized
*/
-static int vfio_base_device_init(VFIODevice *vbasedev)
+static int vfio_base_device_init(VFIODevice *vbasedev, Error **errp)
{
VFIOGroup *group;
VFIODevice *vbasedev_iter;
- char path[PATH_MAX], iommu_group_path[PATH_MAX], *group_name;
+ char *tmp, group_path[PATH_MAX], *group_name;
ssize_t len;
struct stat st;
int groupid;
int ret;
- /* name must be set prior to the call */
- if (!vbasedev->name || strchr(vbasedev->name, '/')) {
- return -EINVAL;
- }
+ /* @sysfsdev takes precedence over @host */
+ if (vbasedev->sysfsdev) {
+ g_free(vbasedev->name);
+ vbasedev->name = g_strdup(basename(vbasedev->sysfsdev));
+ } else {
+ if (!vbasedev->name || strchr(vbasedev->name, '/')) {
+ error_setg(errp, "wrong host device name");
+ return -EINVAL;
+ }
- /* Check that the host device exists */
- g_snprintf(path, sizeof(path), "/sys/bus/platform/devices/%s/",
- vbasedev->name);
+ vbasedev->sysfsdev = g_strdup_printf("/sys/bus/platform/devices/%s",
+ vbasedev->name);
+ }
- if (stat(path, &st) < 0) {
- error_report("vfio: error: no such host device: %s", path);
+ if (stat(vbasedev->sysfsdev, &st) < 0) {
+ error_setg_errno(errp, errno,
+ "failed to get the sysfs host device file status");
return -errno;
}
- g_strlcat(path, "iommu_group", sizeof(path));
- len = readlink(path, iommu_group_path, sizeof(iommu_group_path));
- if (len < 0 || len >= sizeof(iommu_group_path)) {
- error_report("vfio: error no iommu_group for device");
- return len < 0 ? -errno : -ENAMETOOLONG;
+ tmp = g_strdup_printf("%s/iommu_group", vbasedev->sysfsdev);
+ len = readlink(tmp, group_path, sizeof(group_path));
+ g_free(tmp);
+
+ if (len < 0 || len >= sizeof(group_path)) {
+ ret = len < 0 ? -errno : -ENAMETOOLONG;
+ error_setg_errno(errp, -ret, "no iommu_group found");
+ return ret;
}
- iommu_group_path[len] = 0;
- group_name = basename(iommu_group_path);
+ group_path[len] = 0;
+ group_name = basename(group_path);
if (sscanf(group_name, "%d", &groupid) != 1) {
- error_report("vfio: error reading %s: %m", path);
+ error_setg_errno(errp, errno, "failed to read %s", group_path);
return -errno;
}
trace_vfio_platform_base_device_init(vbasedev->name, groupid);
- group = vfio_get_group(groupid, &address_space_memory);
+ group = vfio_get_group(groupid, &address_space_memory, errp);
if (!group) {
- error_report("vfio: failed to get group %d", groupid);
return -ENOENT;
}
- g_snprintf(path, sizeof(path), "%s", vbasedev->name);
-
QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
if (strcmp(vbasedev_iter->name, vbasedev->name) == 0) {
- error_report("vfio: error: device %s is already attached", path);
+ error_setg(errp, "device is already attached");
vfio_put_group(group);
return -EBUSY;
}
}
- ret = vfio_get_device(group, path, vbasedev);
+ ret = vfio_get_device(group, vbasedev->name, vbasedev, errp);
if (ret) {
- error_report("vfio: failed to get device %s", path);
vfio_put_group(group);
return ret;
}
- ret = vfio_populate_device(vbasedev);
+ ret = vfio_populate_device(vbasedev, errp);
if (ret) {
- error_report("vfio: failed to populate device %s", path);
vfio_put_group(group);
}
return ret;
}
-/**
- * vfio_map_region - initialize the 2 memory regions for a given
- * MMIO region index
- * @vdev: the VFIO platform device handle
- * @nr: the index of the region
- *
- * Init the top memory region and the mmapped memory region beneath
- * VFIOPlatformDevice is used since VFIODevice is not a QOM Object
- * and could not be passed to memory region functions
-*/
-static void vfio_map_region(VFIOPlatformDevice *vdev, int nr)
-{
- VFIORegion *region = vdev->regions[nr];
- uint64_t size = region->size;
- char name[64];
-
- if (!size) {
- return;
- }
-
- g_snprintf(name, sizeof(name), "VFIO %s region %d",
- vdev->vbasedev.name, nr);
-
- /* A "slow" read/write mapping underlies all regions */
- memory_region_init_io(®ion->mem, OBJECT(vdev), &vfio_region_ops,
- region, name, size);
-
- g_strlcat(name, " mmap", sizeof(name));
-
- if (vfio_mmap_region(OBJECT(vdev), region, ®ion->mem,
- ®ion->mmap_mem, ®ion->mmap, size, 0, name)) {
- error_report("%s unsupported. Performance may be slow", name);
- }
-}
-
/**
* vfio_platform_realize - the device realize function
* @dev: device state pointer
VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(dev);
SysBusDevice *sbdev = SYS_BUS_DEVICE(dev);
VFIODevice *vbasedev = &vdev->vbasedev;
- VFIOINTp *intp;
int i, ret;
vbasedev->type = VFIO_DEVICE_TYPE_PLATFORM;
+ vbasedev->dev = dev;
vbasedev->ops = &vfio_platform_ops;
- trace_vfio_platform_realize(vbasedev->name, vdev->compat);
+ trace_vfio_platform_realize(vbasedev->sysfsdev ?
+ vbasedev->sysfsdev : vbasedev->name,
+ vdev->compat);
- ret = vfio_base_device_init(vbasedev);
+ ret = vfio_base_device_init(vbasedev, errp);
if (ret) {
- error_setg(errp, "vfio: vfio_base_device_init failed for %s",
- vbasedev->name);
- return;
+ goto out;
}
for (i = 0; i < vbasedev->num_regions; i++) {
- vfio_map_region(vdev, i);
- sysbus_init_mmio(sbdev, &vdev->regions[i]->mem);
+ if (vfio_region_mmap(vdev->regions[i])) {
+ error_report("%s mmap unsupported. Performance may be slow",
+ memory_region_name(vdev->regions[i]->mem));
+ }
+ sysbus_init_mmio(sbdev, vdev->regions[i]->mem);
+ }
+out:
+ if (!ret) {
+ return;
}
- QLIST_FOREACH(intp, &vdev->intp_list, next) {
- vfio_start_eventfd_injection(intp);
+ if (vdev->vbasedev.name) {
+ error_prepend(errp, ERR_PREFIX, vdev->vbasedev.name);
+ } else {
+ error_prepend(errp, "vfio error: ");
}
}
static Property vfio_platform_dev_properties[] = {
DEFINE_PROP_STRING("host", VFIOPlatformDevice, vbasedev.name),
+ DEFINE_PROP_STRING("sysfsdev", VFIOPlatformDevice, vbasedev.sysfsdev),
DEFINE_PROP_BOOL("x-no-mmap", VFIOPlatformDevice, vbasedev.no_mmap, false),
DEFINE_PROP_UINT32("mmap-timeout-ms", VFIOPlatformDevice,
mmap_timeout, 1100),
projects / qemu.git / blobdiff