vfio_get_dev_region_info() unconditionally allocates memory for a passed-in vfio_region_info structure (and does not re-use an already allocated structure). Therefore, we have to free the structure we pass to that function in vfio_ccw_get_region() for every region we successfully obtained information for. Fixes:8fadea24de
("vfio-ccw: support async command subregion") Fixes:46ea3841ed
("vfio-ccw: Add support for the schib region") Fixes:f030532f2a
("vfio-ccw: Add support for the CRW region and IRQ") Reported-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Eric Farman <farman@linux.ibm.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20200928101701.13540-1-cohuck@redhat.com>
753 lines
22 KiB
C
753 lines
22 KiB
C
/*
|
|
* 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
|
|
* directory.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include <linux/vfio.h>
|
|
#include <linux/vfio_ccw.h>
|
|
#include <sys/ioctl.h>
|
|
|
|
#include "qapi/error.h"
|
|
#include "hw/sysbus.h"
|
|
#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/qdev-properties.h"
|
|
#include "hw/s390x/ccw-device.h"
|
|
#include "exec/address-spaces.h"
|
|
#include "qemu/error-report.h"
|
|
#include "qemu/main-loop.h"
|
|
#include "qemu/module.h"
|
|
|
|
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;
|
|
uint64_t schib_region_size;
|
|
uint64_t schib_region_offset;
|
|
struct ccw_schib_region *schib_region;
|
|
uint64_t crw_region_size;
|
|
uint64_t crw_region_offset;
|
|
struct ccw_crw_region *crw_region;
|
|
EventNotifier io_notifier;
|
|
EventNotifier crw_notifier;
|
|
bool force_orb_pfch;
|
|
bool warned_orb_pfch;
|
|
};
|
|
|
|
static inline void warn_once_pfch(VFIOCCWDevice *vcdev, SubchDev *sch,
|
|
const char *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)
|
|
{
|
|
vdev->needs_reset = false;
|
|
}
|
|
|
|
/*
|
|
* We don't need vfio_hot_reset_multi and vfio_eoi operations for
|
|
* vfio_ccw device now.
|
|
*/
|
|
struct VFIODeviceOps vfio_ccw_ops = {
|
|
.vfio_compute_needs_reset = vfio_ccw_compute_needs_reset,
|
|
};
|
|
|
|
static IOInstEnding vfio_ccw_handle_request(SubchDev *sch)
|
|
{
|
|
S390CCWDevice *cdev = sch->driver_data;
|
|
VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
|
|
struct ccw_io_region *region = vcdev->io_region;
|
|
int ret;
|
|
|
|
if (!(sch->orb.ctrl0 & ORB_CTRL0_MASK_PFCH) && vcdev->force_orb_pfch) {
|
|
sch->orb.ctrl0 |= ORB_CTRL0_MASK_PFCH;
|
|
warn_once_pfch(vcdev, sch, "PFCH flag forced");
|
|
}
|
|
|
|
QEMU_BUILD_BUG_ON(sizeof(region->orb_area) != sizeof(ORB));
|
|
QEMU_BUILD_BUG_ON(sizeof(region->scsw_area) != sizeof(SCSW));
|
|
QEMU_BUILD_BUG_ON(sizeof(region->irb_area) != sizeof(IRB));
|
|
|
|
memset(region, 0, sizeof(*region));
|
|
|
|
memcpy(region->orb_area, &sch->orb, sizeof(ORB));
|
|
memcpy(region->scsw_area, &sch->curr_status.scsw, sizeof(SCSW));
|
|
|
|
again:
|
|
ret = pwrite(vcdev->vdev.fd, region,
|
|
vcdev->io_region_size, vcdev->io_region_offset);
|
|
if (ret != vcdev->io_region_size) {
|
|
if (errno == EAGAIN) {
|
|
goto again;
|
|
}
|
|
error_report("vfio-ccw: write I/O region failed with errno=%d", errno);
|
|
ret = -errno;
|
|
} else {
|
|
ret = region->ret_code;
|
|
}
|
|
switch (ret) {
|
|
case 0:
|
|
return IOINST_CC_EXPECTED;
|
|
case -EBUSY:
|
|
return IOINST_CC_BUSY;
|
|
case -ENODEV:
|
|
case -EACCES:
|
|
return IOINST_CC_NOT_OPERATIONAL;
|
|
case -EFAULT:
|
|
default:
|
|
sch_gen_unit_exception(sch);
|
|
css_inject_io_interrupt(sch);
|
|
return IOINST_CC_EXPECTED;
|
|
}
|
|
}
|
|
|
|
static IOInstEnding vfio_ccw_handle_store(SubchDev *sch)
|
|
{
|
|
S390CCWDevice *cdev = sch->driver_data;
|
|
VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
|
|
SCHIB *schib = &sch->curr_status;
|
|
struct ccw_schib_region *region = vcdev->schib_region;
|
|
SCHIB *s;
|
|
int ret;
|
|
|
|
/* schib region not available so nothing else to do */
|
|
if (!region) {
|
|
return IOINST_CC_EXPECTED;
|
|
}
|
|
|
|
memset(region, 0, sizeof(*region));
|
|
ret = pread(vcdev->vdev.fd, region, vcdev->schib_region_size,
|
|
vcdev->schib_region_offset);
|
|
|
|
if (ret == -1) {
|
|
/*
|
|
* Device is probably damaged, but store subchannel does not
|
|
* have a nonzero cc defined for this scenario. Log an error,
|
|
* and presume things are otherwise fine.
|
|
*/
|
|
error_report("vfio-ccw: store region read failed with errno=%d", errno);
|
|
return IOINST_CC_EXPECTED;
|
|
}
|
|
|
|
/*
|
|
* Selectively copy path-related bits of the SCHIB,
|
|
* rather than copying the entire struct.
|
|
*/
|
|
s = (SCHIB *)region->schib_area;
|
|
schib->pmcw.pnom = s->pmcw.pnom;
|
|
schib->pmcw.lpum = s->pmcw.lpum;
|
|
schib->pmcw.pam = s->pmcw.pam;
|
|
schib->pmcw.pom = s->pmcw.pom;
|
|
|
|
if (s->scsw.flags & SCSW_FLAGS_MASK_PNO) {
|
|
schib->scsw.flags |= SCSW_FLAGS_MASK_PNO;
|
|
}
|
|
|
|
return IOINST_CC_EXPECTED;
|
|
}
|
|
|
|
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 = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
|
|
VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
|
|
|
|
ioctl(vcdev->vdev.fd, VFIO_DEVICE_RESET);
|
|
}
|
|
|
|
static void vfio_ccw_crw_read(VFIOCCWDevice *vcdev)
|
|
{
|
|
struct ccw_crw_region *region = vcdev->crw_region;
|
|
CRW crw;
|
|
int size;
|
|
|
|
/* Keep reading CRWs as long as data is returned */
|
|
do {
|
|
memset(region, 0, sizeof(*region));
|
|
size = pread(vcdev->vdev.fd, region, vcdev->crw_region_size,
|
|
vcdev->crw_region_offset);
|
|
|
|
if (size == -1) {
|
|
error_report("vfio-ccw: Read crw region failed with errno=%d",
|
|
errno);
|
|
break;
|
|
}
|
|
|
|
if (region->crw == 0) {
|
|
/* No more CRWs to queue */
|
|
break;
|
|
}
|
|
|
|
memcpy(&crw, ®ion->crw, sizeof(CRW));
|
|
|
|
css_crw_add_to_queue(crw);
|
|
} while (1);
|
|
}
|
|
|
|
static void vfio_ccw_crw_notifier_handler(void *opaque)
|
|
{
|
|
VFIOCCWDevice *vcdev = opaque;
|
|
|
|
while (event_notifier_test_and_clear(&vcdev->crw_notifier)) {
|
|
vfio_ccw_crw_read(vcdev);
|
|
}
|
|
}
|
|
|
|
static void vfio_ccw_io_notifier_handler(void *opaque)
|
|
{
|
|
VFIOCCWDevice *vcdev = opaque;
|
|
struct ccw_io_region *region = vcdev->io_region;
|
|
S390CCWDevice *cdev = S390_CCW_DEVICE(vcdev);
|
|
CcwDevice *ccw_dev = CCW_DEVICE(cdev);
|
|
SubchDev *sch = ccw_dev->sch;
|
|
SCHIB *schib = &sch->curr_status;
|
|
SCSW s;
|
|
IRB irb;
|
|
int size;
|
|
|
|
if (!event_notifier_test_and_clear(&vcdev->io_notifier)) {
|
|
return;
|
|
}
|
|
|
|
size = pread(vcdev->vdev.fd, region, vcdev->io_region_size,
|
|
vcdev->io_region_offset);
|
|
if (size == -1) {
|
|
switch (errno) {
|
|
case ENODEV:
|
|
/* Generate a deferred cc 3 condition. */
|
|
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. */
|
|
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. */
|
|
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. */
|
|
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. */
|
|
s = schib->scsw;
|
|
copy_scsw_to_guest(&s, &irb.scsw);
|
|
schib->scsw = s;
|
|
|
|
/* If a uint check is pending, copy sense data. */
|
|
if ((schib->scsw.dstat & SCSW_DSTAT_UNIT_CHECK) &&
|
|
(schib->pmcw.chars & PMCW_CHARS_MASK_CSENSE)) {
|
|
memcpy(sch->sense_data, irb.ecw, sizeof(irb.ecw));
|
|
}
|
|
|
|
read_err:
|
|
css_inject_io_interrupt(sch);
|
|
}
|
|
|
|
static void vfio_ccw_register_irq_notifier(VFIOCCWDevice *vcdev,
|
|
unsigned int irq,
|
|
Error **errp)
|
|
{
|
|
VFIODevice *vdev = &vcdev->vdev;
|
|
struct vfio_irq_info *irq_info;
|
|
size_t argsz;
|
|
int fd;
|
|
EventNotifier *notifier;
|
|
IOHandler *fd_read;
|
|
|
|
switch (irq) {
|
|
case VFIO_CCW_IO_IRQ_INDEX:
|
|
notifier = &vcdev->io_notifier;
|
|
fd_read = vfio_ccw_io_notifier_handler;
|
|
break;
|
|
case VFIO_CCW_CRW_IRQ_INDEX:
|
|
notifier = &vcdev->crw_notifier;
|
|
fd_read = vfio_ccw_crw_notifier_handler;
|
|
break;
|
|
default:
|
|
error_setg(errp, "vfio: Unsupported device irq(%d)", irq);
|
|
return;
|
|
}
|
|
|
|
if (vdev->num_irqs < irq + 1) {
|
|
error_setg(errp, "vfio: unexpected number of irqs %u",
|
|
vdev->num_irqs);
|
|
return;
|
|
}
|
|
|
|
argsz = sizeof(*irq_info);
|
|
irq_info = g_malloc0(argsz);
|
|
irq_info->index = irq;
|
|
irq_info->argsz = argsz;
|
|
if (ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO,
|
|
irq_info) < 0 || irq_info->count < 1) {
|
|
error_setg_errno(errp, errno, "vfio: Error getting irq info");
|
|
goto out_free_info;
|
|
}
|
|
|
|
if (event_notifier_init(notifier, 0)) {
|
|
error_setg_errno(errp, errno,
|
|
"vfio: Unable to init event notifier for irq (%d)",
|
|
irq);
|
|
goto out_free_info;
|
|
}
|
|
|
|
fd = event_notifier_get_fd(notifier);
|
|
qemu_set_fd_handler(fd, fd_read, NULL, vcdev);
|
|
|
|
if (vfio_set_irq_signaling(vdev, irq, 0,
|
|
VFIO_IRQ_SET_ACTION_TRIGGER, fd, errp)) {
|
|
qemu_set_fd_handler(fd, NULL, NULL, vcdev);
|
|
event_notifier_cleanup(notifier);
|
|
}
|
|
|
|
out_free_info:
|
|
g_free(irq_info);
|
|
}
|
|
|
|
static void vfio_ccw_unregister_irq_notifier(VFIOCCWDevice *vcdev,
|
|
unsigned int irq)
|
|
{
|
|
Error *err = NULL;
|
|
EventNotifier *notifier;
|
|
|
|
switch (irq) {
|
|
case VFIO_CCW_IO_IRQ_INDEX:
|
|
notifier = &vcdev->io_notifier;
|
|
break;
|
|
case VFIO_CCW_CRW_IRQ_INDEX:
|
|
notifier = &vcdev->crw_notifier;
|
|
break;
|
|
default:
|
|
error_report("vfio: Unsupported device irq(%d)", irq);
|
|
return;
|
|
}
|
|
|
|
if (vfio_set_irq_signaling(&vcdev->vdev, irq, 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(notifier),
|
|
NULL, NULL, vcdev);
|
|
event_notifier_cleanup(notifier);
|
|
}
|
|
|
|
static void vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
|
|
{
|
|
VFIODevice *vdev = &vcdev->vdev;
|
|
struct vfio_region_info *info;
|
|
int ret;
|
|
|
|
/* Sanity check device */
|
|
if (!(vdev->flags & VFIO_DEVICE_FLAGS_CCW)) {
|
|
error_setg(errp, "vfio: Um, this isn't a vfio-ccw device");
|
|
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: too few regions (%u), expected at least %u",
|
|
vdev->num_regions, VFIO_CCW_CONFIG_REGION_INDEX + 1);
|
|
return;
|
|
}
|
|
|
|
ret = vfio_get_region_info(vdev, VFIO_CCW_CONFIG_REGION_INDEX, &info);
|
|
if (ret) {
|
|
error_setg_errno(errp, -ret, "vfio: Error getting config info");
|
|
return;
|
|
}
|
|
|
|
vcdev->io_region_size = info->size;
|
|
if (sizeof(*vcdev->io_region) != vcdev->io_region_size) {
|
|
error_setg(errp, "vfio: Unexpected size of the I/O region");
|
|
goto out_err;
|
|
}
|
|
|
|
vcdev->io_region_offset = info->offset;
|
|
vcdev->io_region = g_malloc0(info->size);
|
|
g_free(info);
|
|
|
|
/* 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");
|
|
goto out_err;
|
|
}
|
|
vcdev->async_cmd_region_offset = info->offset;
|
|
vcdev->async_cmd_region = g_malloc0(info->size);
|
|
g_free(info);
|
|
}
|
|
|
|
ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
|
|
VFIO_REGION_SUBTYPE_CCW_SCHIB, &info);
|
|
if (!ret) {
|
|
vcdev->schib_region_size = info->size;
|
|
if (sizeof(*vcdev->schib_region) != vcdev->schib_region_size) {
|
|
error_setg(errp, "vfio: Unexpected size of the schib region");
|
|
goto out_err;
|
|
}
|
|
vcdev->schib_region_offset = info->offset;
|
|
vcdev->schib_region = g_malloc(info->size);
|
|
g_free(info);
|
|
}
|
|
|
|
ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
|
|
VFIO_REGION_SUBTYPE_CCW_CRW, &info);
|
|
|
|
if (!ret) {
|
|
vcdev->crw_region_size = info->size;
|
|
if (sizeof(*vcdev->crw_region) != vcdev->crw_region_size) {
|
|
error_setg(errp, "vfio: Unexpected size of the CRW region");
|
|
goto out_err;
|
|
}
|
|
vcdev->crw_region_offset = info->offset;
|
|
vcdev->crw_region = g_malloc(info->size);
|
|
g_free(info);
|
|
}
|
|
|
|
return;
|
|
|
|
out_err:
|
|
g_free(vcdev->crw_region);
|
|
g_free(vcdev->schib_region);
|
|
g_free(vcdev->async_cmd_region);
|
|
g_free(vcdev->io_region);
|
|
g_free(info);
|
|
return;
|
|
}
|
|
|
|
static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
|
|
{
|
|
g_free(vcdev->crw_region);
|
|
g_free(vcdev->schib_region);
|
|
g_free(vcdev->async_cmd_region);
|
|
g_free(vcdev->io_region);
|
|
}
|
|
|
|
static void vfio_ccw_put_device(VFIOCCWDevice *vcdev)
|
|
{
|
|
g_free(vcdev->vdev.name);
|
|
vfio_put_base_device(&vcdev->vdev);
|
|
}
|
|
|
|
static void vfio_ccw_get_device(VFIOGroup *group, VFIOCCWDevice *vcdev,
|
|
Error **errp)
|
|
{
|
|
char *name = g_strdup_printf("%x.%x.%04x", vcdev->cdev.hostid.cssid,
|
|
vcdev->cdev.hostid.ssid,
|
|
vcdev->cdev.hostid.devid);
|
|
VFIODevice *vbasedev;
|
|
|
|
QLIST_FOREACH(vbasedev, &group->device_list, next) {
|
|
if (strcmp(vbasedev->name, name) == 0) {
|
|
error_setg(errp, "vfio: subchannel %s has already been attached",
|
|
name);
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* All vfio-ccw devices are believed to operate in a way compatible with
|
|
* discarding of memory in RAM blocks, ie. pages pinned in the host are
|
|
* in the current working set of the guest driver and therefore never
|
|
* overlap e.g., with pages available to the guest balloon driver. This
|
|
* needs to be set before vfio_get_device() for vfio common to handle
|
|
* ram_block_discard_disable().
|
|
*/
|
|
vcdev->vdev.ram_block_discard_allowed = true;
|
|
|
|
if (vfio_get_device(group, vcdev->cdev.mdevid, &vcdev->vdev, errp)) {
|
|
goto out_err;
|
|
}
|
|
|
|
vcdev->vdev.ops = &vfio_ccw_ops;
|
|
vcdev->vdev.type = VFIO_DEVICE_TYPE_CCW;
|
|
vcdev->vdev.name = name;
|
|
vcdev->vdev.dev = &vcdev->cdev.parent_obj.parent_obj;
|
|
|
|
return;
|
|
|
|
out_err:
|
|
g_free(name);
|
|
}
|
|
|
|
static VFIOGroup *vfio_ccw_get_group(S390CCWDevice *cdev, Error **errp)
|
|
{
|
|
char *tmp, group_path[PATH_MAX];
|
|
ssize_t len;
|
|
int groupid;
|
|
|
|
tmp = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/%s/iommu_group",
|
|
cdev->hostid.cssid, cdev->hostid.ssid,
|
|
cdev->hostid.devid, cdev->mdevid);
|
|
len = readlink(tmp, group_path, sizeof(group_path));
|
|
g_free(tmp);
|
|
|
|
if (len <= 0 || len >= sizeof(group_path)) {
|
|
error_setg(errp, "vfio: no iommu_group found");
|
|
return NULL;
|
|
}
|
|
|
|
group_path[len] = 0;
|
|
|
|
if (sscanf(basename(group_path), "%d", &groupid) != 1) {
|
|
error_setg(errp, "vfio: failed to read %s", group_path);
|
|
return NULL;
|
|
}
|
|
|
|
return vfio_get_group(groupid, &address_space_memory, errp);
|
|
}
|
|
|
|
static void vfio_ccw_realize(DeviceState *dev, Error **errp)
|
|
{
|
|
VFIOGroup *group;
|
|
CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
|
|
S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
|
|
VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
|
|
S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
|
|
Error *err = NULL;
|
|
|
|
/* Call the class init function for subchannel. */
|
|
if (cdc->realize) {
|
|
cdc->realize(cdev, vcdev->vdev.sysfsdev, &err);
|
|
if (err) {
|
|
goto out_err_propagate;
|
|
}
|
|
}
|
|
|
|
group = vfio_ccw_get_group(cdev, &err);
|
|
if (!group) {
|
|
goto out_group_err;
|
|
}
|
|
|
|
vfio_ccw_get_device(group, vcdev, &err);
|
|
if (err) {
|
|
goto out_device_err;
|
|
}
|
|
|
|
vfio_ccw_get_region(vcdev, &err);
|
|
if (err) {
|
|
goto out_region_err;
|
|
}
|
|
|
|
vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX, &err);
|
|
if (err) {
|
|
goto out_notifier_err;
|
|
}
|
|
|
|
if (vcdev->crw_region) {
|
|
vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX, &err);
|
|
if (err) {
|
|
vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
|
|
goto out_notifier_err;
|
|
}
|
|
}
|
|
|
|
return;
|
|
|
|
out_notifier_err:
|
|
vfio_ccw_put_region(vcdev);
|
|
out_region_err:
|
|
vfio_ccw_put_device(vcdev);
|
|
out_device_err:
|
|
vfio_put_group(group);
|
|
out_group_err:
|
|
if (cdc->unrealize) {
|
|
cdc->unrealize(cdev);
|
|
}
|
|
out_err_propagate:
|
|
error_propagate(errp, err);
|
|
}
|
|
|
|
static void vfio_ccw_unrealize(DeviceState *dev)
|
|
{
|
|
CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
|
|
S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
|
|
VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
|
|
S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
|
|
VFIOGroup *group = vcdev->vdev.group;
|
|
|
|
vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX);
|
|
vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
|
|
vfio_ccw_put_region(vcdev);
|
|
vfio_ccw_put_device(vcdev);
|
|
vfio_put_group(group);
|
|
|
|
if (cdc->unrealize) {
|
|
cdc->unrealize(cdev);
|
|
}
|
|
}
|
|
|
|
static Property vfio_ccw_properties[] = {
|
|
DEFINE_PROP_STRING("sysfsdev", VFIOCCWDevice, vdev.sysfsdev),
|
|
DEFINE_PROP_BOOL("force-orb-pfch", VFIOCCWDevice, force_orb_pfch, false),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static const VMStateDescription vfio_ccw_vmstate = {
|
|
.name = "vfio-ccw",
|
|
.unmigratable = 1,
|
|
};
|
|
|
|
static void vfio_ccw_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
|
|
|
|
device_class_set_props(dc, vfio_ccw_properties);
|
|
dc->vmsd = &vfio_ccw_vmstate;
|
|
dc->desc = "VFIO-based subchannel assignment";
|
|
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
|
|
dc->realize = vfio_ccw_realize;
|
|
dc->unrealize = vfio_ccw_unrealize;
|
|
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;
|
|
cdc->handle_store = vfio_ccw_handle_store;
|
|
}
|
|
|
|
static const TypeInfo vfio_ccw_info = {
|
|
.name = TYPE_VFIO_CCW,
|
|
.parent = TYPE_S390_CCW,
|
|
.instance_size = sizeof(VFIOCCWDevice),
|
|
.class_init = vfio_ccw_class_init,
|
|
};
|
|
|
|
static void register_vfio_ccw_type(void)
|
|
{
|
|
type_register_static(&vfio_ccw_info);
|
|
}
|
|
|
|
type_init(register_vfio_ccw_type)
|