freebsd-dev/sys/dev/pci/pci_iov.c
Mark Johnston 1f960e646b pci: Implement pci_bar_enabled() for SR-IOV VFs
In a VF's configuration space, "memory space enable" is hard-wired to 0,
so the existing implementation always returns false.  We need to read
the SR-IOV control register from the PF device to get the value of the
MSE bit.

Fix pci_bar_enabled() to read this register instead for VFs.  I don't
see any way to access the PF's config space without a backpointer in the
pci device ivars, so I added one.

This fixes a regression where bhyve(8) fails to map the MSI-X table
after commit 7fa2335347 ("bhyve: Map the MSI-X table unconditionally
for passthrough") when a VF is passed through, since with that commit we
use PCIOCBARMMAP to map the table and that ioctl always fails for VFs
without this change.  As a bonus, pciconf(8) now correctly reports the
enablement of BARs for VFs.

Reported and tested by:	Raúl Muñoz <raul.munoz@custos.es>
Reviewed by:	rstone, jhb
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D32839
2021-11-09 13:13:36 -05:00

1087 lines
25 KiB
C

/*-
* Copyright (c) 2013-2015 Sandvine Inc.
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_bus.h"
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/fcntl.h>
#include <sys/ioccom.h>
#include <sys/iov.h>
#include <sys/linker.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/pciio.h>
#include <sys/queue.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <machine/bus.h>
#include <machine/stdarg.h>
#include <sys/nv.h>
#include <sys/iov_schema.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pci_iov.h>
#include <dev/pci/pci_private.h>
#include <dev/pci/pci_iov_private.h>
#include <dev/pci/schema_private.h>
#include "pcib_if.h"
static MALLOC_DEFINE(M_SRIOV, "sr_iov", "PCI SR-IOV allocations");
static d_ioctl_t pci_iov_ioctl;
static struct cdevsw iov_cdevsw = {
.d_version = D_VERSION,
.d_name = "iov",
.d_ioctl = pci_iov_ioctl
};
SYSCTL_DECL(_hw_pci);
/*
* The maximum amount of memory we will allocate for user configuration of an
* SR-IOV device. 1MB ought to be enough for anyone, but leave this
* configurable just in case.
*/
static u_long pci_iov_max_config = 1024 * 1024;
SYSCTL_ULONG(_hw_pci, OID_AUTO, iov_max_config, CTLFLAG_RWTUN,
&pci_iov_max_config, 0, "Maximum allowed size of SR-IOV configuration.");
#define IOV_READ(d, r, w) \
pci_read_config((d)->cfg.dev, (d)->cfg.iov->iov_pos + r, w)
#define IOV_WRITE(d, r, v, w) \
pci_write_config((d)->cfg.dev, (d)->cfg.iov->iov_pos + r, v, w)
static nvlist_t *pci_iov_build_schema(nvlist_t **pf_schema,
nvlist_t **vf_schema);
static void pci_iov_build_pf_schema(nvlist_t *schema,
nvlist_t **driver_schema);
static void pci_iov_build_vf_schema(nvlist_t *schema,
nvlist_t **driver_schema);
static int pci_iov_delete_iov_children(struct pci_devinfo *dinfo);
static nvlist_t *pci_iov_get_pf_subsystem_schema(void);
static nvlist_t *pci_iov_get_vf_subsystem_schema(void);
int
pci_iov_attach_name(device_t dev, struct nvlist *pf_schema,
struct nvlist *vf_schema, const char *fmt, ...)
{
char buf[NAME_MAX + 1];
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
return (PCI_IOV_ATTACH(device_get_parent(dev), dev, pf_schema,
vf_schema, buf));
}
int
pci_iov_attach_method(device_t bus, device_t dev, nvlist_t *pf_schema,
nvlist_t *vf_schema, const char *name)
{
device_t pcib;
struct pci_devinfo *dinfo;
struct pcicfg_iov *iov;
nvlist_t *schema;
uint32_t version;
int error;
int iov_pos;
dinfo = device_get_ivars(dev);
pcib = device_get_parent(bus);
schema = NULL;
error = pci_find_extcap(dev, PCIZ_SRIOV, &iov_pos);
if (error != 0)
return (error);
version = pci_read_config(dev, iov_pos, 4);
if (PCI_EXTCAP_VER(version) != 1) {
if (bootverbose)
device_printf(dev,
"Unsupported version of SR-IOV (%d) detected\n",
PCI_EXTCAP_VER(version));
return (ENXIO);
}
iov = malloc(sizeof(*dinfo->cfg.iov), M_SRIOV, M_WAITOK | M_ZERO);
mtx_lock(&Giant);
if (dinfo->cfg.iov != NULL) {
error = EBUSY;
goto cleanup;
}
iov->iov_pf = dev;
iov->iov_pos = iov_pos;
schema = pci_iov_build_schema(&pf_schema, &vf_schema);
if (schema == NULL) {
error = ENOMEM;
goto cleanup;
}
error = pci_iov_validate_schema(schema);
if (error != 0)
goto cleanup;
iov->iov_schema = schema;
iov->iov_cdev = make_dev(&iov_cdevsw, device_get_unit(dev),
UID_ROOT, GID_WHEEL, 0600, "iov/%s", name);
if (iov->iov_cdev == NULL) {
error = ENOMEM;
goto cleanup;
}
dinfo->cfg.iov = iov;
iov->iov_cdev->si_drv1 = dinfo;
mtx_unlock(&Giant);
return (0);
cleanup:
nvlist_destroy(schema);
nvlist_destroy(pf_schema);
nvlist_destroy(vf_schema);
free(iov, M_SRIOV);
mtx_unlock(&Giant);
return (error);
}
int
pci_iov_detach_method(device_t bus, device_t dev)
{
struct pci_devinfo *dinfo;
struct pcicfg_iov *iov;
int error;
mtx_lock(&Giant);
dinfo = device_get_ivars(dev);
iov = dinfo->cfg.iov;
if (iov == NULL) {
mtx_unlock(&Giant);
return (0);
}
if ((iov->iov_flags & IOV_BUSY) != 0) {
mtx_unlock(&Giant);
return (EBUSY);
}
error = pci_iov_delete_iov_children(dinfo);
if (error != 0) {
mtx_unlock(&Giant);
return (error);
}
dinfo->cfg.iov = NULL;
if (iov->iov_cdev) {
destroy_dev(iov->iov_cdev);
iov->iov_cdev = NULL;
}
nvlist_destroy(iov->iov_schema);
free(iov, M_SRIOV);
mtx_unlock(&Giant);
return (0);
}
static nvlist_t *
pci_iov_build_schema(nvlist_t **pf, nvlist_t **vf)
{
nvlist_t *schema, *pf_driver, *vf_driver;
/* We always take ownership of the schemas. */
pf_driver = *pf;
*pf = NULL;
vf_driver = *vf;
*vf = NULL;
schema = pci_iov_schema_alloc_node();
if (schema == NULL)
goto cleanup;
pci_iov_build_pf_schema(schema, &pf_driver);
pci_iov_build_vf_schema(schema, &vf_driver);
if (nvlist_error(schema) != 0)
goto cleanup;
return (schema);
cleanup:
nvlist_destroy(schema);
nvlist_destroy(pf_driver);
nvlist_destroy(vf_driver);
return (NULL);
}
static void
pci_iov_build_pf_schema(nvlist_t *schema, nvlist_t **driver_schema)
{
nvlist_t *pf_schema, *iov_schema;
pf_schema = pci_iov_schema_alloc_node();
if (pf_schema == NULL) {
nvlist_set_error(schema, ENOMEM);
return;
}
iov_schema = pci_iov_get_pf_subsystem_schema();
/*
* Note that if either *driver_schema or iov_schema is NULL, then
* nvlist_move_nvlist will put the schema in the error state and
* SR-IOV will fail to initialize later, so we don't have to explicitly
* handle that case.
*/
nvlist_move_nvlist(pf_schema, DRIVER_CONFIG_NAME, *driver_schema);
nvlist_move_nvlist(pf_schema, IOV_CONFIG_NAME, iov_schema);
nvlist_move_nvlist(schema, PF_CONFIG_NAME, pf_schema);
*driver_schema = NULL;
}
static void
pci_iov_build_vf_schema(nvlist_t *schema, nvlist_t **driver_schema)
{
nvlist_t *vf_schema, *iov_schema;
vf_schema = pci_iov_schema_alloc_node();
if (vf_schema == NULL) {
nvlist_set_error(schema, ENOMEM);
return;
}
iov_schema = pci_iov_get_vf_subsystem_schema();
/*
* Note that if either *driver_schema or iov_schema is NULL, then
* nvlist_move_nvlist will put the schema in the error state and
* SR-IOV will fail to initialize later, so we don't have to explicitly
* handle that case.
*/
nvlist_move_nvlist(vf_schema, DRIVER_CONFIG_NAME, *driver_schema);
nvlist_move_nvlist(vf_schema, IOV_CONFIG_NAME, iov_schema);
nvlist_move_nvlist(schema, VF_SCHEMA_NAME, vf_schema);
*driver_schema = NULL;
}
static nvlist_t *
pci_iov_get_pf_subsystem_schema(void)
{
nvlist_t *pf;
pf = pci_iov_schema_alloc_node();
if (pf == NULL)
return (NULL);
pci_iov_schema_add_uint16(pf, "num_vfs", IOV_SCHEMA_REQUIRED, -1);
pci_iov_schema_add_string(pf, "device", IOV_SCHEMA_REQUIRED, NULL);
return (pf);
}
static nvlist_t *
pci_iov_get_vf_subsystem_schema(void)
{
nvlist_t *vf;
vf = pci_iov_schema_alloc_node();
if (vf == NULL)
return (NULL);
pci_iov_schema_add_bool(vf, "passthrough", IOV_SCHEMA_HASDEFAULT, 0);
return (vf);
}
static int
pci_iov_alloc_bar(struct pci_devinfo *dinfo, int bar, pci_addr_t bar_shift)
{
struct resource *res;
struct pcicfg_iov *iov;
device_t dev, bus;
rman_res_t start, end;
pci_addr_t bar_size;
int rid;
iov = dinfo->cfg.iov;
dev = dinfo->cfg.dev;
bus = device_get_parent(dev);
rid = iov->iov_pos + PCIR_SRIOV_BAR(bar);
bar_size = 1 << bar_shift;
res = pci_alloc_multi_resource(bus, dev, SYS_RES_MEMORY, &rid, 0,
~0, 1, iov->iov_num_vfs, RF_ACTIVE);
if (res == NULL)
return (ENXIO);
iov->iov_bar[bar].res = res;
iov->iov_bar[bar].bar_size = bar_size;
iov->iov_bar[bar].bar_shift = bar_shift;
start = rman_get_start(res);
end = rman_get_end(res);
return (rman_manage_region(&iov->rman, start, end));
}
static void
pci_iov_add_bars(struct pcicfg_iov *iov, struct pci_devinfo *dinfo)
{
struct pci_iov_bar *bar;
uint64_t bar_start;
int i;
for (i = 0; i <= PCIR_MAX_BAR_0; i++) {
bar = &iov->iov_bar[i];
if (bar->res != NULL) {
bar_start = rman_get_start(bar->res) +
dinfo->cfg.vf.index * bar->bar_size;
pci_add_bar(dinfo->cfg.dev, PCIR_BAR(i), bar_start,
bar->bar_shift);
}
}
}
static int
pci_iov_parse_config(struct pcicfg_iov *iov, struct pci_iov_arg *arg,
nvlist_t **ret)
{
void *packed_config;
nvlist_t *config;
int error;
config = NULL;
packed_config = NULL;
if (arg->len > pci_iov_max_config) {
error = EMSGSIZE;
goto out;
}
packed_config = malloc(arg->len, M_SRIOV, M_WAITOK);
error = copyin(arg->config, packed_config, arg->len);
if (error != 0)
goto out;
config = nvlist_unpack(packed_config, arg->len, NV_FLAG_IGNORE_CASE);
if (config == NULL) {
error = EINVAL;
goto out;
}
error = pci_iov_schema_validate_config(iov->iov_schema, config);
if (error != 0)
goto out;
error = nvlist_error(config);
if (error != 0)
goto out;
*ret = config;
config = NULL;
out:
nvlist_destroy(config);
free(packed_config, M_SRIOV);
return (error);
}
/*
* Set the ARI_EN bit in the lowest-numbered PCI function with the SR-IOV
* capability. This bit is only writeable on the lowest-numbered PF but
* affects all PFs on the device.
*/
static int
pci_iov_set_ari(device_t bus)
{
device_t lowest;
device_t *devlist;
int i, error, devcount, lowest_func, lowest_pos, iov_pos, dev_func;
uint16_t iov_ctl;
/* If ARI is disabled on the downstream port there is nothing to do. */
if (!PCIB_ARI_ENABLED(device_get_parent(bus)))
return (0);
error = device_get_children(bus, &devlist, &devcount);
if (error != 0)
return (error);
lowest = NULL;
for (i = 0; i < devcount; i++) {
if (pci_find_extcap(devlist[i], PCIZ_SRIOV, &iov_pos) == 0) {
dev_func = pci_get_function(devlist[i]);
if (lowest == NULL || dev_func < lowest_func) {
lowest = devlist[i];
lowest_func = dev_func;
lowest_pos = iov_pos;
}
}
}
free(devlist, M_TEMP);
/*
* If we called this function some device must have the SR-IOV
* capability.
*/
KASSERT(lowest != NULL,
("Could not find child of %s with SR-IOV capability",
device_get_nameunit(bus)));
iov_ctl = pci_read_config(lowest, lowest_pos + PCIR_SRIOV_CTL, 2);
iov_ctl |= PCIM_SRIOV_ARI_EN;
pci_write_config(lowest, lowest_pos + PCIR_SRIOV_CTL, iov_ctl, 2);
if ((pci_read_config(lowest, lowest_pos + PCIR_SRIOV_CTL, 2) &
PCIM_SRIOV_ARI_EN) == 0) {
device_printf(lowest, "failed to enable ARI\n");
return (ENXIO);
}
return (0);
}
static int
pci_iov_config_page_size(struct pci_devinfo *dinfo)
{
uint32_t page_cap, page_size;
page_cap = IOV_READ(dinfo, PCIR_SRIOV_PAGE_CAP, 4);
/*
* If the system page size is less than the smallest SR-IOV page size
* then round up to the smallest SR-IOV page size.
*/
if (PAGE_SHIFT < PCI_SRIOV_BASE_PAGE_SHIFT)
page_size = (1 << 0);
else
page_size = (1 << (PAGE_SHIFT - PCI_SRIOV_BASE_PAGE_SHIFT));
/* Check that the device supports the system page size. */
if (!(page_size & page_cap))
return (ENXIO);
IOV_WRITE(dinfo, PCIR_SRIOV_PAGE_SIZE, page_size, 4);
return (0);
}
static int
pci_iov_init(device_t dev, uint16_t num_vfs, const nvlist_t *config)
{
const nvlist_t *device, *driver_config;
device = nvlist_get_nvlist(config, PF_CONFIG_NAME);
driver_config = nvlist_get_nvlist(device, DRIVER_CONFIG_NAME);
return (PCI_IOV_INIT(dev, num_vfs, driver_config));
}
static int
pci_iov_init_rman(device_t pf, struct pcicfg_iov *iov)
{
int error;
iov->rman.rm_start = 0;
iov->rman.rm_end = ~0;
iov->rman.rm_type = RMAN_ARRAY;
snprintf(iov->rman_name, sizeof(iov->rman_name), "%s VF I/O memory",
device_get_nameunit(pf));
iov->rman.rm_descr = iov->rman_name;
error = rman_init(&iov->rman);
if (error != 0)
return (error);
iov->iov_flags |= IOV_RMAN_INITED;
return (0);
}
static int
pci_iov_alloc_bar_ea(struct pci_devinfo *dinfo, int bar)
{
struct pcicfg_iov *iov;
rman_res_t start, end;
struct resource *res;
struct resource_list *rl;
struct resource_list_entry *rle;
rl = &dinfo->resources;
iov = dinfo->cfg.iov;
rle = resource_list_find(rl, SYS_RES_MEMORY,
iov->iov_pos + PCIR_SRIOV_BAR(bar));
if (rle == NULL)
rle = resource_list_find(rl, SYS_RES_IOPORT,
iov->iov_pos + PCIR_SRIOV_BAR(bar));
if (rle == NULL)
return (ENXIO);
res = rle->res;
iov->iov_bar[bar].res = res;
iov->iov_bar[bar].bar_size = rman_get_size(res) / iov->iov_num_vfs;
iov->iov_bar[bar].bar_shift = pci_mapsize(iov->iov_bar[bar].bar_size);
start = rman_get_start(res);
end = rman_get_end(res);
return (rman_manage_region(&iov->rman, start, end));
}
static int
pci_iov_setup_bars(struct pci_devinfo *dinfo)
{
device_t dev;
struct pcicfg_iov *iov;
pci_addr_t bar_value, testval;
int i, last_64, error;
iov = dinfo->cfg.iov;
dev = dinfo->cfg.dev;
last_64 = 0;
pci_add_resources_ea(device_get_parent(dev), dev, 1);
for (i = 0; i <= PCIR_MAX_BAR_0; i++) {
/* First, try to use BARs allocated with EA */
error = pci_iov_alloc_bar_ea(dinfo, i);
if (error == 0)
continue;
/* Allocate legacy-BAR only if EA is not enabled */
if (pci_ea_is_enabled(dev, iov->iov_pos + PCIR_SRIOV_BAR(i)))
continue;
/*
* If a PCI BAR is a 64-bit wide BAR, then it spans two
* consecutive registers. Therefore if the last BAR that
* we looked at was a 64-bit BAR, we need to skip this
* register as it's the second half of the last BAR.
*/
if (!last_64) {
pci_read_bar(dev,
iov->iov_pos + PCIR_SRIOV_BAR(i),
&bar_value, &testval, &last_64);
if (testval != 0) {
error = pci_iov_alloc_bar(dinfo, i,
pci_mapsize(testval));
if (error != 0)
return (error);
}
} else
last_64 = 0;
}
return (0);
}
static void
pci_iov_enumerate_vfs(struct pci_devinfo *dinfo, const nvlist_t *config,
uint16_t first_rid, uint16_t rid_stride)
{
char device_name[VF_MAX_NAME];
const nvlist_t *device, *driver_config, *iov_config;
device_t bus, dev, vf;
struct pcicfg_iov *iov;
struct pci_devinfo *vfinfo;
int i, error;
uint16_t vid, did, next_rid;
iov = dinfo->cfg.iov;
dev = dinfo->cfg.dev;
bus = device_get_parent(dev);
next_rid = first_rid;
vid = pci_get_vendor(dev);
did = IOV_READ(dinfo, PCIR_SRIOV_VF_DID, 2);
for (i = 0; i < iov->iov_num_vfs; i++, next_rid += rid_stride) {
snprintf(device_name, sizeof(device_name), VF_PREFIX"%d", i);
device = nvlist_get_nvlist(config, device_name);
iov_config = nvlist_get_nvlist(device, IOV_CONFIG_NAME);
driver_config = nvlist_get_nvlist(device, DRIVER_CONFIG_NAME);
vf = PCI_CREATE_IOV_CHILD(bus, dev, next_rid, vid, did);
if (vf == NULL)
break;
/*
* If we are creating passthrough devices then force the ppt
* driver to attach to prevent a VF driver from claiming the
* VFs.
*/
if (nvlist_get_bool(iov_config, "passthrough"))
device_set_devclass_fixed(vf, "ppt");
vfinfo = device_get_ivars(vf);
vfinfo->cfg.iov = iov;
vfinfo->cfg.vf.index = i;
pci_iov_add_bars(iov, vfinfo);
error = PCI_IOV_ADD_VF(dev, i, driver_config);
if (error != 0) {
device_printf(dev, "Failed to add VF %d\n", i);
device_delete_child(bus, vf);
}
}
bus_generic_attach(bus);
}
static int
pci_iov_config(struct cdev *cdev, struct pci_iov_arg *arg)
{
device_t bus, dev;
struct pci_devinfo *dinfo;
struct pcicfg_iov *iov;
nvlist_t *config;
int i, error;
uint16_t rid_off, rid_stride;
uint16_t first_rid, last_rid;
uint16_t iov_ctl;
uint16_t num_vfs, total_vfs;
int iov_inited;
mtx_lock(&Giant);
dinfo = cdev->si_drv1;
iov = dinfo->cfg.iov;
dev = dinfo->cfg.dev;
bus = device_get_parent(dev);
iov_inited = 0;
config = NULL;
if ((iov->iov_flags & IOV_BUSY) || iov->iov_num_vfs != 0) {
mtx_unlock(&Giant);
return (EBUSY);
}
iov->iov_flags |= IOV_BUSY;
error = pci_iov_parse_config(iov, arg, &config);
if (error != 0)
goto out;
num_vfs = pci_iov_config_get_num_vfs(config);
total_vfs = IOV_READ(dinfo, PCIR_SRIOV_TOTAL_VFS, 2);
if (num_vfs > total_vfs) {
error = EINVAL;
goto out;
}
error = pci_iov_config_page_size(dinfo);
if (error != 0)
goto out;
error = pci_iov_set_ari(bus);
if (error != 0)
goto out;
error = pci_iov_init(dev, num_vfs, config);
if (error != 0)
goto out;
iov_inited = 1;
IOV_WRITE(dinfo, PCIR_SRIOV_NUM_VFS, num_vfs, 2);
rid_off = IOV_READ(dinfo, PCIR_SRIOV_VF_OFF, 2);
rid_stride = IOV_READ(dinfo, PCIR_SRIOV_VF_STRIDE, 2);
first_rid = pci_get_rid(dev) + rid_off;
last_rid = first_rid + (num_vfs - 1) * rid_stride;
/* We don't yet support allocating extra bus numbers for VFs. */
if (pci_get_bus(dev) != PCI_RID2BUS(last_rid)) {
error = ENOSPC;
goto out;
}
iov_ctl = IOV_READ(dinfo, PCIR_SRIOV_CTL, 2);
iov_ctl &= ~(PCIM_SRIOV_VF_EN | PCIM_SRIOV_VF_MSE);
IOV_WRITE(dinfo, PCIR_SRIOV_CTL, iov_ctl, 2);
error = pci_iov_init_rman(dev, iov);
if (error != 0)
goto out;
iov->iov_num_vfs = num_vfs;
error = pci_iov_setup_bars(dinfo);
if (error != 0)
goto out;
iov_ctl = IOV_READ(dinfo, PCIR_SRIOV_CTL, 2);
iov_ctl |= PCIM_SRIOV_VF_EN | PCIM_SRIOV_VF_MSE;
IOV_WRITE(dinfo, PCIR_SRIOV_CTL, iov_ctl, 2);
/* Per specification, we must wait 100ms before accessing VFs. */
pause("iov", roundup(hz, 10));
pci_iov_enumerate_vfs(dinfo, config, first_rid, rid_stride);
nvlist_destroy(config);
iov->iov_flags &= ~IOV_BUSY;
mtx_unlock(&Giant);
return (0);
out:
if (iov_inited)
PCI_IOV_UNINIT(dev);
for (i = 0; i <= PCIR_MAX_BAR_0; i++) {
if (iov->iov_bar[i].res != NULL) {
pci_release_resource(bus, dev, SYS_RES_MEMORY,
iov->iov_pos + PCIR_SRIOV_BAR(i),
iov->iov_bar[i].res);
pci_delete_resource(bus, dev, SYS_RES_MEMORY,
iov->iov_pos + PCIR_SRIOV_BAR(i));
iov->iov_bar[i].res = NULL;
}
}
if (iov->iov_flags & IOV_RMAN_INITED) {
rman_fini(&iov->rman);
iov->iov_flags &= ~IOV_RMAN_INITED;
}
nvlist_destroy(config);
iov->iov_num_vfs = 0;
iov->iov_flags &= ~IOV_BUSY;
mtx_unlock(&Giant);
return (error);
}
void
pci_iov_cfg_restore(device_t dev, struct pci_devinfo *dinfo)
{
struct pcicfg_iov *iov;
iov = dinfo->cfg.iov;
IOV_WRITE(dinfo, PCIR_SRIOV_PAGE_SIZE, iov->iov_page_size, 4);
IOV_WRITE(dinfo, PCIR_SRIOV_NUM_VFS, iov->iov_num_vfs, 2);
IOV_WRITE(dinfo, PCIR_SRIOV_CTL, iov->iov_ctl, 2);
}
void
pci_iov_cfg_save(device_t dev, struct pci_devinfo *dinfo)
{
struct pcicfg_iov *iov;
iov = dinfo->cfg.iov;
iov->iov_page_size = IOV_READ(dinfo, PCIR_SRIOV_PAGE_SIZE, 4);
iov->iov_ctl = IOV_READ(dinfo, PCIR_SRIOV_CTL, 2);
}
/* Return true if child is a VF of the given PF. */
static int
pci_iov_is_child_vf(struct pcicfg_iov *pf, device_t child)
{
struct pci_devinfo *vfinfo;
vfinfo = device_get_ivars(child);
if (!(vfinfo->cfg.flags & PCICFG_VF))
return (0);
return (pf == vfinfo->cfg.iov);
}
static int
pci_iov_delete_iov_children(struct pci_devinfo *dinfo)
{
device_t bus, dev, vf, *devlist;
struct pcicfg_iov *iov;
int i, error, devcount;
uint32_t iov_ctl;
mtx_assert(&Giant, MA_OWNED);
iov = dinfo->cfg.iov;
dev = dinfo->cfg.dev;
bus = device_get_parent(dev);
devlist = NULL;
iov->iov_flags |= IOV_BUSY;
error = device_get_children(bus, &devlist, &devcount);
if (error != 0)
goto out;
for (i = 0; i < devcount; i++) {
vf = devlist[i];
if (!pci_iov_is_child_vf(iov, vf))
continue;
error = device_detach(vf);
if (error != 0) {
device_printf(dev,
"Could not disable SR-IOV: failed to detach VF %s\n",
device_get_nameunit(vf));
goto out;
}
}
for (i = 0; i < devcount; i++) {
vf = devlist[i];
if (pci_iov_is_child_vf(iov, vf))
device_delete_child(bus, vf);
}
PCI_IOV_UNINIT(dev);
iov_ctl = IOV_READ(dinfo, PCIR_SRIOV_CTL, 2);
iov_ctl &= ~(PCIM_SRIOV_VF_EN | PCIM_SRIOV_VF_MSE);
IOV_WRITE(dinfo, PCIR_SRIOV_CTL, iov_ctl, 2);
IOV_WRITE(dinfo, PCIR_SRIOV_NUM_VFS, 0, 2);
iov->iov_num_vfs = 0;
for (i = 0; i <= PCIR_MAX_BAR_0; i++) {
if (iov->iov_bar[i].res != NULL) {
pci_release_resource(bus, dev, SYS_RES_MEMORY,
iov->iov_pos + PCIR_SRIOV_BAR(i),
iov->iov_bar[i].res);
pci_delete_resource(bus, dev, SYS_RES_MEMORY,
iov->iov_pos + PCIR_SRIOV_BAR(i));
iov->iov_bar[i].res = NULL;
}
}
if (iov->iov_flags & IOV_RMAN_INITED) {
rman_fini(&iov->rman);
iov->iov_flags &= ~IOV_RMAN_INITED;
}
error = 0;
out:
free(devlist, M_TEMP);
iov->iov_flags &= ~IOV_BUSY;
return (error);
}
static int
pci_iov_delete(struct cdev *cdev)
{
struct pci_devinfo *dinfo;
struct pcicfg_iov *iov;
int error;
mtx_lock(&Giant);
dinfo = cdev->si_drv1;
iov = dinfo->cfg.iov;
if ((iov->iov_flags & IOV_BUSY) != 0) {
error = EBUSY;
goto out;
}
if (iov->iov_num_vfs == 0) {
error = ECHILD;
goto out;
}
error = pci_iov_delete_iov_children(dinfo);
out:
mtx_unlock(&Giant);
return (error);
}
static int
pci_iov_get_schema_ioctl(struct cdev *cdev, struct pci_iov_schema *output)
{
struct pci_devinfo *dinfo;
void *packed;
size_t output_len, size;
int error;
packed = NULL;
mtx_lock(&Giant);
dinfo = cdev->si_drv1;
packed = nvlist_pack(dinfo->cfg.iov->iov_schema, &size);
mtx_unlock(&Giant);
if (packed == NULL) {
error = ENOMEM;
goto fail;
}
output_len = output->len;
output->len = size;
if (size <= output_len) {
error = copyout(packed, output->schema, size);
if (error != 0)
goto fail;
output->error = 0;
} else
/*
* If we return an error then the ioctl code won't copyout
* output back to userland, so we flag the error in the struct
* instead.
*/
output->error = EMSGSIZE;
error = 0;
fail:
free(packed, M_NVLIST);
return (error);
}
static int
pci_iov_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
struct thread *td)
{
switch (cmd) {
case IOV_CONFIG:
return (pci_iov_config(dev, (struct pci_iov_arg *)data));
case IOV_DELETE:
return (pci_iov_delete(dev));
case IOV_GET_SCHEMA:
return (pci_iov_get_schema_ioctl(dev,
(struct pci_iov_schema *)data));
default:
return (EINVAL);
}
}
struct resource *
pci_vf_alloc_mem_resource(device_t dev, device_t child, int *rid,
rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
{
struct pci_devinfo *dinfo;
struct pcicfg_iov *iov;
struct pci_map *map;
struct resource *res;
struct resource_list_entry *rle;
rman_res_t bar_start, bar_end;
pci_addr_t bar_length;
int error;
dinfo = device_get_ivars(child);
iov = dinfo->cfg.iov;
map = pci_find_bar(child, *rid);
if (map == NULL)
return (NULL);
bar_length = 1 << map->pm_size;
bar_start = map->pm_value;
bar_end = bar_start + bar_length - 1;
/* Make sure that the resource fits the constraints. */
if (bar_start >= end || bar_end <= bar_start || count != 1)
return (NULL);
/* Clamp the resource to the constraints if necessary. */
if (bar_start < start)
bar_start = start;
if (bar_end > end)
bar_end = end;
bar_length = bar_end - bar_start + 1;
res = rman_reserve_resource(&iov->rman, bar_start, bar_end,
bar_length, flags, child);
if (res == NULL)
return (NULL);
rle = resource_list_add(&dinfo->resources, SYS_RES_MEMORY, *rid,
bar_start, bar_end, 1);
if (rle == NULL) {
rman_release_resource(res);
return (NULL);
}
rman_set_rid(res, *rid);
if (flags & RF_ACTIVE) {
error = bus_activate_resource(child, SYS_RES_MEMORY, *rid, res);
if (error != 0) {
resource_list_delete(&dinfo->resources, SYS_RES_MEMORY,
*rid);
rman_release_resource(res);
return (NULL);
}
}
rle->res = res;
return (res);
}
int
pci_vf_release_mem_resource(device_t dev, device_t child, int rid,
struct resource *r)
{
struct pci_devinfo *dinfo;
struct resource_list_entry *rle;
int error;
dinfo = device_get_ivars(child);
if (rman_get_flags(r) & RF_ACTIVE) {
error = bus_deactivate_resource(child, SYS_RES_MEMORY, rid, r);
if (error != 0)
return (error);
}
rle = resource_list_find(&dinfo->resources, SYS_RES_MEMORY, rid);
if (rle != NULL) {
rle->res = NULL;
resource_list_delete(&dinfo->resources, SYS_RES_MEMORY,
rid);
}
return (rman_release_resource(r));
}