Commit 7e749462 authored by Cornelia Huck's avatar Cornelia Huck
Browse files

s390x/virtio-ccw: Adapter interrupt support. 



Handle the new CCW_CMD_SET_IND_ADAPTER command enabling adapter interrupts
on guest request. When active, host->guest notifications will be handled
via global_indicator -> queue indicators instead of queue indicators +
subchannel I/O interrupt. Indicators for virtqueues may be present at an
offset.

Acked-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
parent f55ea629

hw/s390x/css.c

+10 −0
Original line number Diff line number Diff line
@@ -116,6 +116,15 @@ void css_conditional_io_interrupt(SubchDev *sch) 
    }

}



void css_adapter_interrupt(uint8_t isc)

{

    S390CPU *cpu = s390_cpu_addr2state(0);

    uint32_t io_int_word = (isc << 27) | IO_INT_WORD_AI;



    trace_css_adapter_interrupt(isc);

    s390_io_interrupt(cpu, 0, 0, 0, io_int_word);

}



static void sch_handle_clear_func(SubchDev *sch)

{

    PMCW *p = &sch->curr_status.pmcw;
@@ -1259,6 +1268,7 @@ void css_reset_sch(SubchDev *sch) 
    sch->channel_prog = 0x0;

    sch->last_cmd_valid = false;

    sch->orb = NULL;

    sch->thinint_active = false;

}



void css_reset(void)

hw/s390x/css.h

+2 −0
Original line number Diff line number Diff line
@@ -77,6 +77,7 @@ struct SubchDev { 
    CCW1 last_cmd;

    bool last_cmd_valid;

    ORB *orb;

    bool thinint_active;

    /* transport-provided data: */

    int (*ccw_cb) (SubchDev *, CCW1);

    SenseId id;
@@ -97,4 +98,5 @@ void css_queue_crw(uint8_t rsc, uint8_t erc, int chain, uint16_t rsid); 
void css_generate_sch_crws(uint8_t cssid, uint8_t ssid, uint16_t schid,

                           int hotplugged, int add);

void css_generate_chp_crws(uint8_t cssid, uint8_t chpid);

void css_adapter_interrupt(uint8_t isc);

#endif

hw/s390x/virtio-ccw.c

+95 −7
Original line number Diff line number Diff line 
/*

 * virtio ccw target implementation

 *

 * Copyright 2012 IBM Corp.

 * Copyright 2012,2014 IBM Corp.

 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2 or (at
@@ -188,6 +188,13 @@ typedef struct VirtioFeatDesc { 
    uint8_t index;

} QEMU_PACKED VirtioFeatDesc;



typedef struct VirtioThinintInfo {

    hwaddr summary_indicator;

    hwaddr device_indicator;

    uint64_t ind_bit;

    uint8_t isc;

} QEMU_PACKED VirtioThinintInfo;



/* Specify where the virtqueues for the subchannel are in guest memory. */

static int virtio_ccw_set_vqs(SubchDev *sch, uint64_t addr, uint32_t align,

                              uint16_t index, uint16_t num)
@@ -237,6 +244,7 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw) 
    bool check_len;

    int len;

    hwaddr hw_len;

    VirtioThinintInfo *thinint;



    if (!dev) {

        return -EINVAL;
@@ -428,6 +436,11 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw) 
            ret = -EINVAL;

            break;

        }

        if (sch->thinint_active) {

            /* Trigger a command reject. */

            ret = -ENOSYS;

            break;

        }

        if (!ccw.cda) {

            ret = -EFAULT;

        } else {
@@ -480,6 +493,42 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw) 
            ret = 0;

        }

        break;

    case CCW_CMD_SET_IND_ADAPTER:

        if (check_len) {

            if (ccw.count != sizeof(*thinint)) {

                ret = -EINVAL;

                break;

            }

        } else if (ccw.count < sizeof(*thinint)) {

            /* Can't execute command. */

            ret = -EINVAL;

            break;

        }

        len = sizeof(*thinint);

        hw_len = len;

        if (!ccw.cda) {

            ret = -EFAULT;

        } else if (dev->indicators && !sch->thinint_active) {

            /* Trigger a command reject. */

            ret = -ENOSYS;

        } else {

            thinint = cpu_physical_memory_map(ccw.cda, &hw_len, 0);

            if (!thinint) {

                ret = -EFAULT;

            } else {

                len = hw_len;

                dev->summary_indicator = thinint->summary_indicator;

                dev->indicators = thinint->device_indicator;

                dev->thinint_isc = thinint->isc;

                dev->ind_bit = thinint->ind_bit;

                cpu_physical_memory_unmap(thinint, hw_len, 0, hw_len);

                sch->thinint_active = ((dev->indicators != 0) &&

                                       (dev->summary_indicator != 0));

                sch->curr_status.scsw.count = ccw.count - len;

                ret = 0;

            }

        }

        break;

    default:

        ret = -ENOSYS;

        break;
@@ -511,6 +560,7 @@ static int virtio_ccw_device_init(VirtioCcwDevice *dev, VirtIODevice *vdev) 
    sch->channel_prog = 0x0;

    sch->last_cmd_valid = false;

    sch->orb = NULL;

    sch->thinint_active = false;

    /*

     * Use a device number if provided. Otherwise, fall back to subchannel

     * number.
@@ -858,6 +908,28 @@ static inline VirtioCcwDevice *to_virtio_ccw_dev_fast(DeviceState *d) 
    return container_of(d, VirtioCcwDevice, parent_obj);

}



static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc,

                                     uint8_t to_be_set)

{

    uint8_t ind_old, ind_new;

    hwaddr len = 1;

    uint8_t *ind_addr;



    ind_addr = cpu_physical_memory_map(ind_loc, &len, 1);

    if (!ind_addr) {

        error_report("%s(%x.%x.%04x): unable to access indicator",

                     __func__, sch->cssid, sch->ssid, sch->schid);

        return -1;

    }

    do {

        ind_old = *ind_addr;

        ind_new = ind_old | to_be_set;

    } while (atomic_cmpxchg(ind_addr, ind_old, ind_new) != ind_old);

    cpu_physical_memory_unmap(ind_addr, len, 1, len);



    return ind_old;

}



static void virtio_ccw_notify(DeviceState *d, uint16_t vector)

{

    VirtioCcwDevice *dev = to_virtio_ccw_dev_fast(d);
@@ -872,9 +944,26 @@ static void virtio_ccw_notify(DeviceState *d, uint16_t vector) 
        if (!dev->indicators) {

            return;

        }

        if (sch->thinint_active) {

            /*

             * In the adapter interrupt case, indicators points to a

             * memory area that may be (way) larger than 64 bit and

             * ind_bit indicates the start of the indicators in a big

             * endian notation.

             */

            virtio_set_ind_atomic(sch, dev->indicators +

                                  (dev->ind_bit + vector) / 8,

                                  0x80 >> ((dev->ind_bit + vector) % 8));

            if (!virtio_set_ind_atomic(sch, dev->summary_indicator,

                                       0x01)) {

                css_adapter_interrupt(dev->thinint_isc);

            }

        } else {

            indicators = ldq_phys(&address_space_memory, dev->indicators);

            indicators |= 1ULL << vector;

            stq_phys(&address_space_memory, dev->indicators, indicators);

            css_conditional_io_interrupt(sch);

        }

    } else {

        if (!dev->indicators2) {

            return;
@@ -883,10 +972,8 @@ static void virtio_ccw_notify(DeviceState *d, uint16_t vector) 
        indicators = ldq_phys(&address_space_memory, dev->indicators2);

        indicators |= 1ULL << vector;

        stq_phys(&address_space_memory, dev->indicators2, indicators);

    }



        css_conditional_io_interrupt(sch);



    }

}



static unsigned virtio_ccw_get_features(DeviceState *d)
@@ -907,6 +994,7 @@ static void virtio_ccw_reset(DeviceState *d) 
    css_reset_sch(dev->sch);

    dev->indicators = 0;

    dev->indicators2 = 0;

    dev->summary_indicator = 0;

}



static void virtio_ccw_vmstate_change(DeviceState *d, bool running)

hw/s390x/virtio-ccw.h

+4 −0
Original line number Diff line number Diff line
@@ -38,6 +38,7 @@ 
#define CCW_CMD_SET_IND      0x43

#define CCW_CMD_SET_CONF_IND 0x53

#define CCW_CMD_READ_VQ_CONF 0x32

#define CCW_CMD_SET_IND_ADAPTER 0x73



#define TYPE_VIRTIO_CCW_DEVICE "virtio-ccw-device"

#define VIRTIO_CCW_DEVICE(obj) \
@@ -83,9 +84,12 @@ struct VirtioCcwDevice { 
    bool ioeventfd_started;

    bool ioeventfd_disabled;

    uint32_t flags;

    uint8_t thinint_isc;

    /* Guest provided values: */

    hwaddr indicators;

    hwaddr indicators2;

    hwaddr summary_indicator;

    uint64_t ind_bit;

};



/* virtual css bus type */

target-s390x/ioinst.h

+2 −0
Original line number Diff line number Diff line
@@ -212,6 +212,8 @@ typedef struct IOIntCode { 
#define IO_INT_WORD_ISC(_int_word) ((_int_word & 0x38000000) >> 24)

#define ISC_TO_ISC_BITS(_isc)      ((0x80 >> _isc) << 24)



#define IO_INT_WORD_AI 0x80000000



int ioinst_disassemble_sch_ident(uint32_t value, int *m, int *cssid, int *ssid,

                                 int *schid);

void ioinst_handle_xsch(S390CPU *cpu, uint64_t reg1);