470 lines
13 KiB
C
470 lines
13 KiB
C
/*
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* vfio based subchannel assignment support
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*
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* Copyright 2017 IBM Corp.
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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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* Pierre Morel <pmorel@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#include "qemu/osdep.h"
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#include <linux/vfio.h>
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#include <linux/vfio_ccw.h>
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#include <sys/ioctl.h>
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#include "qapi/error.h"
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#include "hw/sysbus.h"
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#include "hw/vfio/vfio.h"
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#include "hw/vfio/vfio-common.h"
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#include "hw/s390x/s390-ccw.h"
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#include "hw/s390x/ccw-device.h"
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#include "exec/address-spaces.h"
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#include "qemu/error-report.h"
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#define TYPE_VFIO_CCW "vfio-ccw"
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typedef struct VFIOCCWDevice {
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S390CCWDevice cdev;
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VFIODevice vdev;
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uint64_t io_region_size;
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uint64_t io_region_offset;
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struct ccw_io_region *io_region;
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EventNotifier io_notifier;
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} VFIOCCWDevice;
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static void vfio_ccw_compute_needs_reset(VFIODevice *vdev)
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{
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vdev->needs_reset = false;
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}
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/*
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* We don't need vfio_hot_reset_multi and vfio_eoi operations for
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* vfio_ccw device now.
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*/
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struct VFIODeviceOps vfio_ccw_ops = {
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.vfio_compute_needs_reset = vfio_ccw_compute_needs_reset,
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};
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static IOInstEnding vfio_ccw_handle_request(SubchDev *sch)
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{
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S390CCWDevice *cdev = sch->driver_data;
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VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
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struct ccw_io_region *region = vcdev->io_region;
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int ret;
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QEMU_BUILD_BUG_ON(sizeof(region->orb_area) != sizeof(ORB));
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QEMU_BUILD_BUG_ON(sizeof(region->scsw_area) != sizeof(SCSW));
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QEMU_BUILD_BUG_ON(sizeof(region->irb_area) != sizeof(IRB));
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memset(region, 0, sizeof(*region));
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memcpy(region->orb_area, &sch->orb, sizeof(ORB));
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memcpy(region->scsw_area, &sch->curr_status.scsw, sizeof(SCSW));
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again:
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ret = pwrite(vcdev->vdev.fd, region,
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vcdev->io_region_size, vcdev->io_region_offset);
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if (ret != vcdev->io_region_size) {
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if (errno == EAGAIN) {
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goto again;
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}
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error_report("vfio-ccw: wirte I/O region failed with errno=%d", errno);
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ret = -errno;
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} else {
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ret = region->ret_code;
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}
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switch (ret) {
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case 0:
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return IOINST_CC_EXPECTED;
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case -EBUSY:
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return IOINST_CC_BUSY;
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case -ENODEV:
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case -EACCES:
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return IOINST_CC_NOT_OPERATIONAL;
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case -EFAULT:
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default:
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sch_gen_unit_exception(sch);
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css_inject_io_interrupt(sch);
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return IOINST_CC_EXPECTED;
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}
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}
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static void vfio_ccw_reset(DeviceState *dev)
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{
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CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
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S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
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VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
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ioctl(vcdev->vdev.fd, VFIO_DEVICE_RESET);
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}
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static void vfio_ccw_io_notifier_handler(void *opaque)
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{
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VFIOCCWDevice *vcdev = opaque;
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struct ccw_io_region *region = vcdev->io_region;
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S390CCWDevice *cdev = S390_CCW_DEVICE(vcdev);
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CcwDevice *ccw_dev = CCW_DEVICE(cdev);
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SubchDev *sch = ccw_dev->sch;
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SCSW *s = &sch->curr_status.scsw;
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PMCW *p = &sch->curr_status.pmcw;
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IRB irb;
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int size;
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if (!event_notifier_test_and_clear(&vcdev->io_notifier)) {
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return;
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}
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size = pread(vcdev->vdev.fd, region, vcdev->io_region_size,
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vcdev->io_region_offset);
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if (size == -1) {
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switch (errno) {
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case ENODEV:
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/* Generate a deferred cc 3 condition. */
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s->flags |= SCSW_FLAGS_MASK_CC;
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s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
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s->ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND);
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goto read_err;
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case EFAULT:
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/* Memory problem, generate channel data check. */
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s->ctrl &= ~SCSW_ACTL_START_PEND;
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s->cstat = SCSW_CSTAT_DATA_CHECK;
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s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
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s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
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SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
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goto read_err;
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default:
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/* Error, generate channel program check. */
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s->ctrl &= ~SCSW_ACTL_START_PEND;
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s->cstat = SCSW_CSTAT_PROG_CHECK;
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s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
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s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
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SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
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goto read_err;
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}
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} else if (size != vcdev->io_region_size) {
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/* Information transfer error, generate channel-control check. */
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s->ctrl &= ~SCSW_ACTL_START_PEND;
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s->cstat = SCSW_CSTAT_CHN_CTRL_CHK;
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s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
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s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
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SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
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goto read_err;
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}
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memcpy(&irb, region->irb_area, sizeof(IRB));
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/* Update control block via irb. */
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copy_scsw_to_guest(s, &irb.scsw);
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/* If a uint check is pending, copy sense data. */
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if ((s->dstat & SCSW_DSTAT_UNIT_CHECK) &&
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(p->chars & PMCW_CHARS_MASK_CSENSE)) {
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memcpy(sch->sense_data, irb.ecw, sizeof(irb.ecw));
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}
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read_err:
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css_inject_io_interrupt(sch);
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}
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static void vfio_ccw_register_io_notifier(VFIOCCWDevice *vcdev, Error **errp)
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{
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VFIODevice *vdev = &vcdev->vdev;
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struct vfio_irq_info *irq_info;
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struct vfio_irq_set *irq_set;
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size_t argsz;
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int32_t *pfd;
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if (vdev->num_irqs < VFIO_CCW_IO_IRQ_INDEX + 1) {
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error_setg(errp, "vfio: unexpected number of io irqs %u",
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vdev->num_irqs);
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return;
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}
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argsz = sizeof(*irq_info);
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irq_info = g_malloc0(argsz);
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irq_info->index = VFIO_CCW_IO_IRQ_INDEX;
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irq_info->argsz = argsz;
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if (ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO,
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irq_info) < 0 || irq_info->count < 1) {
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error_setg_errno(errp, errno, "vfio: Error getting irq info");
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goto out_free_info;
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}
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if (event_notifier_init(&vcdev->io_notifier, 0)) {
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error_setg_errno(errp, errno,
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"vfio: Unable to init event notifier for IO");
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goto out_free_info;
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}
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argsz = sizeof(*irq_set) + sizeof(*pfd);
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irq_set = g_malloc0(argsz);
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irq_set->argsz = argsz;
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irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
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VFIO_IRQ_SET_ACTION_TRIGGER;
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irq_set->index = VFIO_CCW_IO_IRQ_INDEX;
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irq_set->start = 0;
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irq_set->count = 1;
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pfd = (int32_t *) &irq_set->data;
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*pfd = event_notifier_get_fd(&vcdev->io_notifier);
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qemu_set_fd_handler(*pfd, vfio_ccw_io_notifier_handler, NULL, vcdev);
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if (ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set)) {
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error_setg(errp, "vfio: Failed to set up io notification");
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qemu_set_fd_handler(*pfd, NULL, NULL, vcdev);
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event_notifier_cleanup(&vcdev->io_notifier);
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}
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g_free(irq_set);
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out_free_info:
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g_free(irq_info);
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}
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static void vfio_ccw_unregister_io_notifier(VFIOCCWDevice *vcdev)
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{
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struct vfio_irq_set *irq_set;
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size_t argsz;
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int32_t *pfd;
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argsz = sizeof(*irq_set) + sizeof(*pfd);
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irq_set = g_malloc0(argsz);
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irq_set->argsz = argsz;
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irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
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VFIO_IRQ_SET_ACTION_TRIGGER;
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irq_set->index = VFIO_CCW_IO_IRQ_INDEX;
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irq_set->start = 0;
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irq_set->count = 1;
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pfd = (int32_t *) &irq_set->data;
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*pfd = -1;
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if (ioctl(vcdev->vdev.fd, VFIO_DEVICE_SET_IRQS, irq_set)) {
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error_report("vfio: Failed to de-assign device io fd: %m");
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}
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qemu_set_fd_handler(event_notifier_get_fd(&vcdev->io_notifier),
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NULL, NULL, vcdev);
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event_notifier_cleanup(&vcdev->io_notifier);
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g_free(irq_set);
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}
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static void vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
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{
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VFIODevice *vdev = &vcdev->vdev;
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struct vfio_region_info *info;
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int ret;
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/* Sanity check device */
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if (!(vdev->flags & VFIO_DEVICE_FLAGS_CCW)) {
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error_setg(errp, "vfio: Um, this isn't a vfio-ccw device");
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return;
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}
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if (vdev->num_regions < VFIO_CCW_CONFIG_REGION_INDEX + 1) {
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error_setg(errp, "vfio: Unexpected number of the I/O region %u",
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vdev->num_regions);
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return;
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}
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ret = vfio_get_region_info(vdev, VFIO_CCW_CONFIG_REGION_INDEX, &info);
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if (ret) {
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error_setg_errno(errp, -ret, "vfio: Error getting config info");
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return;
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}
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vcdev->io_region_size = info->size;
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if (sizeof(*vcdev->io_region) != vcdev->io_region_size) {
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error_setg(errp, "vfio: Unexpected size of the I/O region");
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g_free(info);
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return;
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}
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vcdev->io_region_offset = info->offset;
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vcdev->io_region = g_malloc0(info->size);
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g_free(info);
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}
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static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
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{
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g_free(vcdev->io_region);
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}
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static void vfio_ccw_put_device(VFIOCCWDevice *vcdev)
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{
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g_free(vcdev->vdev.name);
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vfio_put_base_device(&vcdev->vdev);
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}
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static void vfio_ccw_get_device(VFIOGroup *group, VFIOCCWDevice *vcdev,
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Error **errp)
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{
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char *name = g_strdup_printf("%x.%x.%04x", vcdev->cdev.hostid.cssid,
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vcdev->cdev.hostid.ssid,
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vcdev->cdev.hostid.devid);
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VFIODevice *vbasedev;
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QLIST_FOREACH(vbasedev, &group->device_list, next) {
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if (strcmp(vbasedev->name, name) == 0) {
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error_setg(errp, "vfio: subchannel %s has already been attached",
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name);
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goto out_err;
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}
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}
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if (vfio_get_device(group, vcdev->cdev.mdevid, &vcdev->vdev, errp)) {
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goto out_err;
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}
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vcdev->vdev.ops = &vfio_ccw_ops;
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vcdev->vdev.type = VFIO_DEVICE_TYPE_CCW;
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vcdev->vdev.name = name;
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vcdev->vdev.dev = &vcdev->cdev.parent_obj.parent_obj;
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return;
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out_err:
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g_free(name);
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}
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static VFIOGroup *vfio_ccw_get_group(S390CCWDevice *cdev, Error **errp)
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{
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char *tmp, group_path[PATH_MAX];
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ssize_t len;
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int groupid;
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tmp = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/%s/iommu_group",
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cdev->hostid.cssid, cdev->hostid.ssid,
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cdev->hostid.devid, cdev->mdevid);
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len = readlink(tmp, group_path, sizeof(group_path));
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g_free(tmp);
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if (len <= 0 || len >= sizeof(group_path)) {
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error_setg(errp, "vfio: no iommu_group found");
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return NULL;
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}
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group_path[len] = 0;
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if (sscanf(basename(group_path), "%d", &groupid) != 1) {
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error_setg(errp, "vfio: failed to read %s", group_path);
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return NULL;
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}
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return vfio_get_group(groupid, &address_space_memory, errp);
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}
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static void vfio_ccw_realize(DeviceState *dev, Error **errp)
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{
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VFIOGroup *group;
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CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
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S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
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VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
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S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
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Error *err = NULL;
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/* Call the class init function for subchannel. */
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if (cdc->realize) {
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cdc->realize(cdev, vcdev->vdev.sysfsdev, &err);
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if (err) {
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goto out_err_propagate;
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}
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}
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group = vfio_ccw_get_group(cdev, &err);
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if (!group) {
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goto out_group_err;
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}
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vfio_ccw_get_device(group, vcdev, &err);
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if (err) {
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goto out_device_err;
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}
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vfio_ccw_get_region(vcdev, &err);
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if (err) {
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goto out_region_err;
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}
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vfio_ccw_register_io_notifier(vcdev, &err);
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if (err) {
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goto out_notifier_err;
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}
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return;
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out_notifier_err:
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vfio_ccw_put_region(vcdev);
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out_region_err:
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vfio_ccw_put_device(vcdev);
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out_device_err:
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vfio_put_group(group);
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out_group_err:
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if (cdc->unrealize) {
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cdc->unrealize(cdev, NULL);
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}
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out_err_propagate:
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error_propagate(errp, err);
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}
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static void vfio_ccw_unrealize(DeviceState *dev, Error **errp)
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{
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CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
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S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
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VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
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S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
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VFIOGroup *group = vcdev->vdev.group;
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vfio_ccw_unregister_io_notifier(vcdev);
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vfio_ccw_put_region(vcdev);
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vfio_ccw_put_device(vcdev);
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vfio_put_group(group);
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if (cdc->unrealize) {
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cdc->unrealize(cdev, errp);
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}
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}
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static Property vfio_ccw_properties[] = {
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DEFINE_PROP_STRING("sysfsdev", VFIOCCWDevice, vdev.sysfsdev),
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DEFINE_PROP_END_OF_LIST(),
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};
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static const VMStateDescription vfio_ccw_vmstate = {
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.name = TYPE_VFIO_CCW,
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.unmigratable = 1,
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};
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static void vfio_ccw_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
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dc->props = vfio_ccw_properties;
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dc->vmsd = &vfio_ccw_vmstate;
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dc->desc = "VFIO-based subchannel assignment";
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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dc->realize = vfio_ccw_realize;
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dc->unrealize = vfio_ccw_unrealize;
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dc->reset = vfio_ccw_reset;
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cdc->handle_request = vfio_ccw_handle_request;
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}
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static const TypeInfo vfio_ccw_info = {
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.name = TYPE_VFIO_CCW,
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.parent = TYPE_S390_CCW,
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.instance_size = sizeof(VFIOCCWDevice),
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.class_init = vfio_ccw_class_init,
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};
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|
|
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static void register_vfio_ccw_type(void)
|
|
{
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|
type_register_static(&vfio_ccw_info);
|
|
}
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|
|
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type_init(register_vfio_ccw_type)
|