* vfio based subchannel assignment support
*
* Copyright 2017 IBM Corp.
+ * Copyright 2019 Red Hat, Inc.
+ *
* Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
* Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
* Pierre Morel <pmorel@linux.vnet.ibm.com>
+ * Cornelia Huck <cohuck@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at
* your option) any later version. See the COPYING file in the top-level
#include "hw/vfio/vfio.h"
#include "hw/vfio/vfio-common.h"
#include "hw/s390x/s390-ccw.h"
+#include "hw/s390x/vfio-ccw.h"
#include "hw/s390x/ccw-device.h"
#include "exec/address-spaces.h"
#include "qemu/error-report.h"
+#include "qemu/module.h"
-#define TYPE_VFIO_CCW "vfio-ccw"
-typedef struct VFIOCCWDevice {
+struct VFIOCCWDevice {
S390CCWDevice cdev;
VFIODevice vdev;
uint64_t io_region_size;
uint64_t io_region_offset;
struct ccw_io_region *io_region;
+ uint64_t async_cmd_region_size;
+ uint64_t async_cmd_region_offset;
+ struct ccw_cmd_region *async_cmd_region;
EventNotifier io_notifier;
bool force_orb_pfch;
bool warned_orb_pfch;
-} VFIOCCWDevice;
-
-static inline void warn_once(bool *warned, const char *fmt, ...)
-{
- va_list ap;
-
- if (!warned || *warned) {
- return;
- }
- *warned = true;
- va_start(ap, fmt);
- warn_vreport(fmt, ap);
- va_end(ap);
-}
+};
static inline void warn_once_pfch(VFIOCCWDevice *vcdev, SubchDev *sch,
const char *msg)
{
- warn_once(&vcdev->warned_orb_pfch, "vfio-ccw (devno %x.%x.%04x): %s",
- sch->cssid, sch->ssid, sch->devno, msg);
+ warn_report_once_cond(&vcdev->warned_orb_pfch,
+ "vfio-ccw (devno %x.%x.%04x): %s",
+ sch->cssid, sch->ssid, sch->devno, msg);
}
static void vfio_ccw_compute_needs_reset(VFIODevice *vdev)
}
}
+static int vfio_ccw_handle_clear(SubchDev *sch)
+{
+ S390CCWDevice *cdev = sch->driver_data;
+ VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
+ struct ccw_cmd_region *region = vcdev->async_cmd_region;
+ int ret;
+
+ if (!vcdev->async_cmd_region) {
+ /* Async command region not available, fall back to emulation */
+ return -ENOSYS;
+ }
+
+ memset(region, 0, sizeof(*region));
+ region->command = VFIO_CCW_ASYNC_CMD_CSCH;
+
+again:
+ ret = pwrite(vcdev->vdev.fd, region,
+ vcdev->async_cmd_region_size, vcdev->async_cmd_region_offset);
+ if (ret != vcdev->async_cmd_region_size) {
+ if (errno == EAGAIN) {
+ goto again;
+ }
+ error_report("vfio-ccw: write cmd region failed with errno=%d", errno);
+ ret = -errno;
+ } else {
+ ret = region->ret_code;
+ }
+ switch (ret) {
+ case 0:
+ case -ENODEV:
+ case -EACCES:
+ return 0;
+ case -EFAULT:
+ default:
+ sch_gen_unit_exception(sch);
+ css_inject_io_interrupt(sch);
+ return 0;
+ }
+}
+
+static int vfio_ccw_handle_halt(SubchDev *sch)
+{
+ S390CCWDevice *cdev = sch->driver_data;
+ VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
+ struct ccw_cmd_region *region = vcdev->async_cmd_region;
+ int ret;
+
+ if (!vcdev->async_cmd_region) {
+ /* Async command region not available, fall back to emulation */
+ return -ENOSYS;
+ }
+
+ memset(region, 0, sizeof(*region));
+ region->command = VFIO_CCW_ASYNC_CMD_HSCH;
+
+again:
+ ret = pwrite(vcdev->vdev.fd, region,
+ vcdev->async_cmd_region_size, vcdev->async_cmd_region_offset);
+ if (ret != vcdev->async_cmd_region_size) {
+ if (errno == EAGAIN) {
+ goto again;
+ }
+ error_report("vfio-ccw: write cmd region failed with errno=%d", errno);
+ ret = -errno;
+ } else {
+ ret = region->ret_code;
+ }
+ switch (ret) {
+ case 0:
+ case -EBUSY:
+ case -ENODEV:
+ case -EACCES:
+ return 0;
+ case -EFAULT:
+ default:
+ sch_gen_unit_exception(sch);
+ css_inject_io_interrupt(sch);
+ return 0;
+ }
+}
+
static void vfio_ccw_reset(DeviceState *dev)
{
CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
S390CCWDevice *cdev = S390_CCW_DEVICE(vcdev);
CcwDevice *ccw_dev = CCW_DEVICE(cdev);
SubchDev *sch = ccw_dev->sch;
- SCSW *s = &sch->curr_status.scsw;
- PMCW *p = &sch->curr_status.pmcw;
+ SCHIB *schib = &sch->curr_status;
+ SCSW s;
IRB irb;
int size;
switch (errno) {
case ENODEV:
/* Generate a deferred cc 3 condition. */
- s->flags |= SCSW_FLAGS_MASK_CC;
- s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
- s->ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND);
+ schib->scsw.flags |= SCSW_FLAGS_MASK_CC;
+ schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
+ schib->scsw.ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND);
goto read_err;
case EFAULT:
/* Memory problem, generate channel data check. */
- s->ctrl &= ~SCSW_ACTL_START_PEND;
- s->cstat = SCSW_CSTAT_DATA_CHECK;
- s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
- s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
+ schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
+ schib->scsw.cstat = SCSW_CSTAT_DATA_CHECK;
+ schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
+ schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
goto read_err;
default:
/* Error, generate channel program check. */
- s->ctrl &= ~SCSW_ACTL_START_PEND;
- s->cstat = SCSW_CSTAT_PROG_CHECK;
- s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
- s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
+ schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
+ schib->scsw.cstat = SCSW_CSTAT_PROG_CHECK;
+ schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
+ schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
goto read_err;
}
} else if (size != vcdev->io_region_size) {
/* Information transfer error, generate channel-control check. */
- s->ctrl &= ~SCSW_ACTL_START_PEND;
- s->cstat = SCSW_CSTAT_CHN_CTRL_CHK;
- s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
- s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
+ schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
+ schib->scsw.cstat = SCSW_CSTAT_CHN_CTRL_CHK;
+ schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
+ schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
goto read_err;
}
memcpy(&irb, region->irb_area, sizeof(IRB));
/* Update control block via irb. */
- copy_scsw_to_guest(s, &irb.scsw);
+ s = schib->scsw;
+ copy_scsw_to_guest(&s, &irb.scsw);
+ schib->scsw = s;
/* If a uint check is pending, copy sense data. */
- if ((s->dstat & SCSW_DSTAT_UNIT_CHECK) &&
- (p->chars & PMCW_CHARS_MASK_CSENSE)) {
+ if ((schib->scsw.dstat & SCSW_DSTAT_UNIT_CHECK) &&
+ (schib->pmcw.chars & PMCW_CHARS_MASK_CSENSE)) {
memcpy(sch->sense_data, irb.ecw, sizeof(irb.ecw));
}
{
VFIODevice *vdev = &vcdev->vdev;
struct vfio_irq_info *irq_info;
- struct vfio_irq_set *irq_set;
size_t argsz;
- int32_t *pfd;
+ int fd;
if (vdev->num_irqs < VFIO_CCW_IO_IRQ_INDEX + 1) {
error_setg(errp, "vfio: unexpected number of io irqs %u",
goto out_free_info;
}
- argsz = sizeof(*irq_set) + sizeof(*pfd);
- irq_set = g_malloc0(argsz);
- irq_set->argsz = argsz;
- irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
- VFIO_IRQ_SET_ACTION_TRIGGER;
- irq_set->index = VFIO_CCW_IO_IRQ_INDEX;
- irq_set->start = 0;
- irq_set->count = 1;
- pfd = (int32_t *) &irq_set->data;
-
- *pfd = event_notifier_get_fd(&vcdev->io_notifier);
- qemu_set_fd_handler(*pfd, vfio_ccw_io_notifier_handler, NULL, vcdev);
- if (ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set)) {
- error_setg(errp, "vfio: Failed to set up io notification");
- qemu_set_fd_handler(*pfd, NULL, NULL, vcdev);
+ fd = event_notifier_get_fd(&vcdev->io_notifier);
+ qemu_set_fd_handler(fd, vfio_ccw_io_notifier_handler, NULL, vcdev);
+
+ if (vfio_set_irq_signaling(vdev, VFIO_CCW_IO_IRQ_INDEX, 0,
+ VFIO_IRQ_SET_ACTION_TRIGGER, fd, errp)) {
+ qemu_set_fd_handler(fd, NULL, NULL, vcdev);
event_notifier_cleanup(&vcdev->io_notifier);
}
- g_free(irq_set);
-
out_free_info:
g_free(irq_info);
}
static void vfio_ccw_unregister_io_notifier(VFIOCCWDevice *vcdev)
{
- struct vfio_irq_set *irq_set;
- size_t argsz;
- int32_t *pfd;
-
- argsz = sizeof(*irq_set) + sizeof(*pfd);
- irq_set = g_malloc0(argsz);
- irq_set->argsz = argsz;
- irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
- VFIO_IRQ_SET_ACTION_TRIGGER;
- irq_set->index = VFIO_CCW_IO_IRQ_INDEX;
- irq_set->start = 0;
- irq_set->count = 1;
- pfd = (int32_t *) &irq_set->data;
- *pfd = -1;
+ Error *err = NULL;
- if (ioctl(vcdev->vdev.fd, VFIO_DEVICE_SET_IRQS, irq_set)) {
- error_report("vfio: Failed to de-assign device io fd: %m");
+ if (vfio_set_irq_signaling(&vcdev->vdev, VFIO_CCW_IO_IRQ_INDEX, 0,
+ VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err)) {
+ error_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
}
qemu_set_fd_handler(event_notifier_get_fd(&vcdev->io_notifier),
NULL, NULL, vcdev);
event_notifier_cleanup(&vcdev->io_notifier);
-
- g_free(irq_set);
}
static void vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
return;
}
+ /*
+ * We always expect at least the I/O region to be present. We also
+ * may have a variable number of regions governed by capabilities.
+ */
if (vdev->num_regions < VFIO_CCW_CONFIG_REGION_INDEX + 1) {
- error_setg(errp, "vfio: Unexpected number of the I/O region %u",
- vdev->num_regions);
+ error_setg(errp, "vfio: too few regions (%u), expected at least %u",
+ vdev->num_regions, VFIO_CCW_CONFIG_REGION_INDEX + 1);
return;
}
vcdev->io_region_offset = info->offset;
vcdev->io_region = g_malloc0(info->size);
+ /* check for the optional async command region */
+ ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
+ VFIO_REGION_SUBTYPE_CCW_ASYNC_CMD, &info);
+ if (!ret) {
+ vcdev->async_cmd_region_size = info->size;
+ if (sizeof(*vcdev->async_cmd_region) != vcdev->async_cmd_region_size) {
+ error_setg(errp, "vfio: Unexpected size of the async cmd region");
+ g_free(vcdev->io_region);
+ g_free(info);
+ return;
+ }
+ vcdev->async_cmd_region_offset = info->offset;
+ vcdev->async_cmd_region = g_malloc0(info->size);
+ }
+
g_free(info);
}
static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
{
+ g_free(vcdev->async_cmd_region);
g_free(vcdev->io_region);
}
};
static const VMStateDescription vfio_ccw_vmstate = {
- .name = TYPE_VFIO_CCW,
+ .name = "vfio-ccw",
.unmigratable = 1,
};
dc->reset = vfio_ccw_reset;
cdc->handle_request = vfio_ccw_handle_request;
+ cdc->handle_halt = vfio_ccw_handle_halt;
+ cdc->handle_clear = vfio_ccw_handle_clear;
}
static const TypeInfo vfio_ccw_info = {
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