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/* $OpenBSD: viomb.c,v 1.14 2015/06/11 04:38:23 jsg Exp $ */
/* $NetBSD: viomb.c,v 1.1 2011/10/30 12:12:21 hannken Exp $ */
/*
* Copyright (c) 2012 Talypov Dinar <dinar@i-nk.ru>
* Copyright (c) 2010 Minoura Makoto.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <sys/task.h>
#include <sys/pool.h>
#include <sys/sensors.h>
#include <uvm/uvm_extern.h>
#include <dev/pci/virtioreg.h>
#include <dev/pci/virtiovar.h>
#if VIRTIO_PAGE_SIZE!=PAGE_SIZE
#error non-4K page sizes are not supported yet
#endif
#define DEVNAME(sc) sc->sc_dev.dv_xname
#if VIRTIO_DEBUG
#define VIOMBDEBUG(sc, format, args...) \
do { printf("%s: " format, sc->sc_dev.dv_xname, ##args);} \
while (0)
#else
#define VIOMBDEBUG(...)
#endif
/* flags used to specify kind of operation,
* actually should be moved to virtiovar.h
*/
#define VRING_READ 0
#define VRING_WRITE 1
/* notify or don't notify */
#define VRING_NO_NOTIFY 0
#define VRING_NOTIFY 1
/* Configuration registers */
#define VIRTIO_BALLOON_CONFIG_NUM_PAGES 0 /* 32bit */
#define VIRTIO_BALLOON_CONFIG_ACTUAL 4 /* 32bit */
/* Feature bits */
#define VIRTIO_BALLOON_F_MUST_TELL_HOST (1<<0)
#define VIRTIO_BALLOON_F_STATS_VQ (1<<1)
static const struct virtio_feature_name viomb_feature_names[] = {
{VIRTIO_BALLOON_F_MUST_TELL_HOST, "TellHost"},
{VIRTIO_BALLOON_F_STATS_VQ, "StatVQ"},
{0, NULL}
};
#define PGS_PER_REQ 256 /* 1MB, 4KB/page */
#define VQ_INFLATE 0
#define VQ_DEFLATE 1
struct balloon_req {
bus_dmamap_t bl_dmamap;
struct pglist bl_pglist;
int bl_nentries;
u_int32_t *bl_pages;
};
struct viomb_softc {
struct device sc_dev;
struct virtio_softc *sc_virtio;
struct virtqueue sc_vq[2];
u_int32_t sc_npages; /* desired pages */
u_int32_t sc_actual; /* current pages */
struct balloon_req sc_req;
struct taskq *sc_taskq;
struct task sc_task;
struct pglist sc_balloon_pages;
struct ksensor sc_sens[2];
struct ksensordev sc_sensdev;
};
int viomb_match(struct device *, void *, void *);
void viomb_attach(struct device *, struct device *, void *);
void viomb_worker(void *);
void viomb_inflate(struct viomb_softc *);
void viomb_deflate(struct viomb_softc *);
int viomb_config_change(struct virtio_softc *);
void viomb_read_config(struct viomb_softc *);
int viomb_vq_dequeue(struct virtqueue *);
int viomb_inflate_intr(struct virtqueue *);
int viomb_deflate_intr(struct virtqueue *);
struct cfattach viomb_ca = {
sizeof(struct viomb_softc), viomb_match, viomb_attach
};
struct cfdriver viomb_cd = {
NULL, "viomb", DV_DULL
};
int
viomb_match(struct device *parent, void *match, void *aux)
{
struct virtio_softc *va = aux;
if (va->sc_childdevid == PCI_PRODUCT_VIRTIO_BALLOON)
return (1);
return (0);
}
void
viomb_attach(struct device *parent, struct device *self, void *aux)
{
struct viomb_softc *sc = (struct viomb_softc *)self;
struct virtio_softc *vsc = (struct virtio_softc *)parent;
u_int32_t features;
int i;
if (vsc->sc_child != NULL) {
printf("child already attached for %s; something wrong...\n",
parent->dv_xname);
return;
}
/* fail on non-4K page size archs */
if (VIRTIO_PAGE_SIZE != PAGE_SIZE){
printf("non-4K page size arch found, needs %d, got %d\n",
VIRTIO_PAGE_SIZE, PAGE_SIZE);
return;
}
sc->sc_virtio = vsc;
vsc->sc_vqs = &sc->sc_vq[VQ_INFLATE];
vsc->sc_nvqs = 0;
vsc->sc_child = self;
vsc->sc_ipl = IPL_BIO;
vsc->sc_config_change = viomb_config_change;
vsc->sc_intrhand = virtio_vq_intr;
/* negotiate features */
features = VIRTIO_F_RING_INDIRECT_DESC;
features = virtio_negotiate_features(vsc, features,
viomb_feature_names);
if ((virtio_alloc_vq(vsc, &sc->sc_vq[VQ_INFLATE], VQ_INFLATE,
sizeof(u_int32_t) * PGS_PER_REQ, 1, "inflate") != 0))
goto err;
vsc->sc_nvqs++;
if ((virtio_alloc_vq(vsc, &sc->sc_vq[VQ_DEFLATE], VQ_DEFLATE,
sizeof(u_int32_t) * PGS_PER_REQ, 1, "deflate") != 0))
goto err;
vsc->sc_nvqs++;
sc->sc_vq[VQ_INFLATE].vq_done = viomb_inflate_intr;
sc->sc_vq[VQ_DEFLATE].vq_done = viomb_deflate_intr;
virtio_start_vq_intr(vsc, &sc->sc_vq[VQ_INFLATE]);
virtio_start_vq_intr(vsc, &sc->sc_vq[VQ_DEFLATE]);
viomb_read_config(sc);
TAILQ_INIT(&sc->sc_balloon_pages);
if ((sc->sc_req.bl_pages = dma_alloc(sizeof(u_int32_t) * PGS_PER_REQ,
PR_NOWAIT|PR_ZERO)) == NULL) {
printf("%s: Can't alloc DMA memory.\n", DEVNAME(sc));
goto err;
}
if (bus_dmamap_create(vsc->sc_dmat, sizeof(u_int32_t) * PGS_PER_REQ,
1, sizeof(u_int32_t) * PGS_PER_REQ, 0,
BUS_DMA_NOWAIT, &sc->sc_req.bl_dmamap)) {
printf("%s: dmamap creation failed.\n", DEVNAME(sc));
goto err;
}
if (bus_dmamap_load(vsc->sc_dmat, sc->sc_req.bl_dmamap,
&sc->sc_req.bl_pages[0],
sizeof(uint32_t) * PGS_PER_REQ,
NULL, BUS_DMA_NOWAIT)) {
printf("%s: dmamap load failed.\n", DEVNAME(sc));
goto err_dmamap;
}
sc->sc_taskq = taskq_create("viomb", 1, IPL_BIO, 0);
if (sc->sc_taskq == NULL)
goto err_dmamap;
task_set(&sc->sc_task, viomb_worker, sc);
strlcpy(sc->sc_sensdev.xname, DEVNAME(sc),
sizeof(sc->sc_sensdev.xname));
strlcpy(sc->sc_sens[0].desc, "desired",
sizeof(sc->sc_sens[0].desc));
sc->sc_sens[0].type = SENSOR_INTEGER;
sensor_attach(&sc->sc_sensdev, &sc->sc_sens[0]);
sc->sc_sens[0].value = sc->sc_npages << PAGE_SHIFT;
strlcpy(sc->sc_sens[1].desc, "current",
sizeof(sc->sc_sens[1].desc));
sc->sc_sens[1].type = SENSOR_INTEGER;
sensor_attach(&sc->sc_sensdev, &sc->sc_sens[1]);
sc->sc_sens[1].value = sc->sc_actual << PAGE_SHIFT;
sensordev_install(&sc->sc_sensdev);
printf("\n");
return;
err_dmamap:
bus_dmamap_destroy(vsc->sc_dmat, sc->sc_req.bl_dmamap);
err:
if (sc->sc_req.bl_pages)
dma_free(sc->sc_req.bl_pages, sizeof(u_int32_t) * PGS_PER_REQ);
for (i = 0; i < vsc->sc_nvqs; i++)
virtio_free_vq(vsc, &sc->sc_vq[i]);
vsc->sc_nvqs = 0;
vsc->sc_child = VIRTIO_CHILD_ERROR;
return;
}
/*
* Config change
*/
int
viomb_config_change(struct virtio_softc *vsc)
{
struct viomb_softc *sc = (struct viomb_softc *)vsc->sc_child;
task_add(sc->sc_taskq, &sc->sc_task);
return (1);
}
void
viomb_worker(void *arg1)
{
struct viomb_softc *sc = (struct viomb_softc *)arg1;
int s;
s = splbio();
viomb_read_config(sc);
if (sc->sc_npages > sc->sc_actual){
VIOMBDEBUG(sc, "inflating balloon from %u to %u.\n",
sc->sc_actual, sc->sc_npages);
viomb_inflate(sc);
}
else if (sc->sc_npages < sc->sc_actual){
VIOMBDEBUG(sc, "deflating balloon from %u to %u.\n",
sc->sc_actual, sc->sc_npages);
viomb_deflate(sc);
}
sc->sc_sens[0].value = sc->sc_npages << PAGE_SHIFT;
sc->sc_sens[1].value = sc->sc_actual << PAGE_SHIFT;
splx(s);
}
void
viomb_inflate(struct viomb_softc *sc)
{
struct virtio_softc *vsc = (struct virtio_softc *)sc->sc_virtio;
struct balloon_req *b;
struct vm_page *p;
struct virtqueue *vq = &sc->sc_vq[VQ_INFLATE];
u_int32_t nvpages;
int slot, error, i = 0;
nvpages = sc->sc_npages - sc->sc_actual;
if (nvpages > PGS_PER_REQ)
nvpages = PGS_PER_REQ;
b = &sc->sc_req;
if ((error = uvm_pglistalloc(nvpages * PAGE_SIZE, 0,
dma_constraint.ucr_high,
0, 0, &b->bl_pglist, nvpages,
UVM_PLA_NOWAIT))) {
printf("%s unable to allocate %u physmem pages,"
"error %d\n", DEVNAME(sc), nvpages, error);
return;
}
b->bl_nentries = nvpages;
TAILQ_FOREACH(p, &b->bl_pglist, pageq)
b->bl_pages[i++] = p->phys_addr / VIRTIO_PAGE_SIZE;
KASSERT(i == nvpages);
if ((virtio_enqueue_prep(vq, &slot)) > 0) {
printf("%s:virtio_enqueue_prep() vq_num %d\n",
DEVNAME(sc), vq->vq_num);
goto err;
}
if (virtio_enqueue_reserve(vq, slot, 1)) {
printf("%s:virtio_enqueue_reserve vq_num %d\n",
DEVNAME(sc), vq->vq_num);
goto err;
}
bus_dmamap_sync(vsc->sc_dmat, b->bl_dmamap, 0,
sizeof(u_int32_t) * nvpages, BUS_DMASYNC_PREWRITE);
virtio_enqueue_p(vq, slot, b->bl_dmamap, 0,
sizeof(u_int32_t) * nvpages, VRING_READ);
virtio_enqueue_commit(vsc, vq, slot, VRING_NOTIFY);
return;
err:
uvm_pglistfree(&b->bl_pglist);
return;
}
void
viomb_deflate(struct viomb_softc *sc)
{
struct virtio_softc *vsc = (struct virtio_softc *)sc->sc_virtio;
struct balloon_req *b;
struct vm_page *p;
struct virtqueue *vq = &sc->sc_vq[VQ_DEFLATE];
u_int64_t nvpages;
int i, slot;
nvpages = sc->sc_actual - sc->sc_npages;
if (nvpages > PGS_PER_REQ)
nvpages = PGS_PER_REQ;
b = &sc->sc_req;
b->bl_nentries = nvpages;
TAILQ_INIT(&b->bl_pglist);
for (i = 0; i < nvpages; i++) {
p = TAILQ_FIRST(&sc->sc_balloon_pages);
if (p == NULL){
b->bl_nentries = i - 1;
break;
}
TAILQ_REMOVE(&sc->sc_balloon_pages, p, pageq);
TAILQ_INSERT_TAIL(&b->bl_pglist, p, pageq);
b->bl_pages[i] = p->phys_addr / VIRTIO_PAGE_SIZE;
}
if (virtio_enqueue_prep(vq, &slot)) {
printf("%s:virtio_get_slot(def) vq_num %d\n",
DEVNAME(sc), vq->vq_num);
goto err;
}
if (virtio_enqueue_reserve(vq, slot, 1)) {
printf("%s:virtio_enqueue_reserve() vq_num %d\n",
DEVNAME(sc), vq->vq_num);
goto err;
}
bus_dmamap_sync(vsc->sc_dmat, b->bl_dmamap, 0,
sizeof(u_int32_t) * nvpages,
BUS_DMASYNC_PREWRITE);
virtio_enqueue_p(vq, slot, b->bl_dmamap, 0,
sizeof(u_int32_t) * nvpages, VRING_READ);
if (!(vsc->sc_features & VIRTIO_BALLOON_F_MUST_TELL_HOST))
uvm_pglistfree(&b->bl_pglist);
virtio_enqueue_commit(vsc, vq, slot, VRING_NOTIFY);
return;
err:
while ((p = TAILQ_LAST(&b->bl_pglist, pglist))) {
TAILQ_REMOVE(&b->bl_pglist, p, pageq);
TAILQ_INSERT_HEAD(&sc->sc_balloon_pages, p, pageq);
}
return;
}
void
viomb_read_config(struct viomb_softc *sc)
{
struct virtio_softc *vsc = (struct virtio_softc *)sc->sc_virtio;
u_int32_t reg;
/* these values are explicitly specified as little-endian */
reg = virtio_read_device_config_4(vsc, VIRTIO_BALLOON_CONFIG_NUM_PAGES);
sc->sc_npages = letoh32(reg);
reg = virtio_read_device_config_4(vsc, VIRTIO_BALLOON_CONFIG_ACTUAL);
sc->sc_actual = letoh32(reg);
VIOMBDEBUG(sc, "sc->sc_npages %u, sc->sc_actual %u\n",
sc->sc_npages, sc->sc_actual);
}
int
viomb_vq_dequeue(struct virtqueue *vq)
{
struct virtio_softc *vsc = vq->vq_owner;
struct viomb_softc *sc = (struct viomb_softc *)vsc->sc_child;
int r, slot;
r = virtio_dequeue(vsc, vq, &slot, NULL);
if (r != 0) {
printf("%s: dequeue failed, errno %d\n", DEVNAME(sc), r);
return(r);
}
virtio_dequeue_commit(vq, slot);
return(0);
}
/*
* interrupt handling for vq's
*/
int
viomb_inflate_intr(struct virtqueue *vq)
{
struct virtio_softc *vsc = vq->vq_owner;
struct viomb_softc *sc = (struct viomb_softc *)vsc->sc_child;
struct balloon_req *b;
struct vm_page *p;
u_int64_t nvpages;
if (viomb_vq_dequeue(vq))
return(1);
b = &sc->sc_req;
nvpages = b->bl_nentries;
bus_dmamap_sync(vsc->sc_dmat, b->bl_dmamap, 0,
sizeof(u_int32_t) * nvpages,
BUS_DMASYNC_POSTWRITE);
while (!TAILQ_EMPTY(&b->bl_pglist)) {
p = TAILQ_FIRST(&b->bl_pglist);
TAILQ_REMOVE(&b->bl_pglist, p, pageq);
TAILQ_INSERT_TAIL(&sc->sc_balloon_pages, p, pageq);
}
VIOMBDEBUG(sc, "updating sc->sc_actual from %u to %llu\n",
sc->sc_actual, sc->sc_actual + nvpages);
virtio_write_device_config_4(vsc, VIRTIO_BALLOON_CONFIG_ACTUAL,
sc->sc_actual + nvpages);
viomb_read_config(sc);
/* if we have more work to do, add it to the task list */
if (sc->sc_npages > sc->sc_actual)
task_add(sc->sc_taskq, &sc->sc_task);
return (1);
}
int
viomb_deflate_intr(struct virtqueue *vq)
{
struct virtio_softc *vsc = vq->vq_owner;
struct viomb_softc *sc = (struct viomb_softc *)vsc->sc_child;
struct balloon_req *b;
u_int64_t nvpages;
if (viomb_vq_dequeue(vq))
return(1);
b = &sc->sc_req;
nvpages = b->bl_nentries;
bus_dmamap_sync(vsc->sc_dmat, b->bl_dmamap, 0,
sizeof(u_int32_t) * nvpages,
BUS_DMASYNC_POSTWRITE);
if (vsc->sc_features & VIRTIO_BALLOON_F_MUST_TELL_HOST)
uvm_pglistfree(&b->bl_pglist);
VIOMBDEBUG(sc, "updating sc->sc_actual from %u to %llu\n",
sc->sc_actual, sc->sc_actual - nvpages);
virtio_write_device_config_4(vsc, VIRTIO_BALLOON_CONFIG_ACTUAL,
sc->sc_actual - nvpages);
viomb_read_config(sc);
/* if we have more work to do, add it to tasks list */
if (sc->sc_npages < sc->sc_actual)
task_add(sc->sc_taskq, &sc->sc_task);
return(1);
}
|