freebsd-dev/usr.sbin/bhyve/pci_passthru.c
2014-04-22 18:55:21 +00:00

791 lines
18 KiB
C

/*-
* Copyright (c) 2011 NetApp, 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 NETAPP, INC ``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 NETAPP, INC 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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/pciio.h>
#include <sys/ioctl.h>
#include <dev/io/iodev.h>
#include <dev/pci/pcireg.h>
#include <machine/iodev.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <machine/vmm.h>
#include <vmmapi.h>
#include "pci_emul.h"
#include "mem.h"
#ifndef _PATH_DEVPCI
#define _PATH_DEVPCI "/dev/pci"
#endif
#ifndef _PATH_DEVIO
#define _PATH_DEVIO "/dev/io"
#endif
#define LEGACY_SUPPORT 1
#define MSIX_TABLE_COUNT(ctrl) (((ctrl) & PCIM_MSIXCTRL_TABLE_SIZE) + 1)
#define MSIX_CAPLEN 12
static int pcifd = -1;
static int iofd = -1;
struct passthru_softc {
struct pci_devinst *psc_pi;
struct pcibar psc_bar[PCI_BARMAX + 1];
struct {
int capoff;
int msgctrl;
int emulated;
} psc_msi;
struct {
int capoff;
} psc_msix;
struct pcisel psc_sel;
};
static int
msi_caplen(int msgctrl)
{
int len;
len = 10; /* minimum length of msi capability */
if (msgctrl & PCIM_MSICTRL_64BIT)
len += 4;
#if 0
/*
* Ignore the 'mask' and 'pending' bits in the MSI capability.
* We'll let the guest manipulate them directly.
*/
if (msgctrl & PCIM_MSICTRL_VECTOR)
len += 10;
#endif
return (len);
}
static uint32_t
read_config(const struct pcisel *sel, long reg, int width)
{
struct pci_io pi;
bzero(&pi, sizeof(pi));
pi.pi_sel = *sel;
pi.pi_reg = reg;
pi.pi_width = width;
if (ioctl(pcifd, PCIOCREAD, &pi) < 0)
return (0); /* XXX */
else
return (pi.pi_data);
}
static void
write_config(const struct pcisel *sel, long reg, int width, uint32_t data)
{
struct pci_io pi;
bzero(&pi, sizeof(pi));
pi.pi_sel = *sel;
pi.pi_reg = reg;
pi.pi_width = width;
pi.pi_data = data;
(void)ioctl(pcifd, PCIOCWRITE, &pi); /* XXX */
}
#ifdef LEGACY_SUPPORT
static int
passthru_add_msicap(struct pci_devinst *pi, int msgnum, int nextptr)
{
int capoff, i;
struct msicap msicap;
u_char *capdata;
pci_populate_msicap(&msicap, msgnum, nextptr);
/*
* XXX
* Copy the msi capability structure in the last 16 bytes of the
* config space. This is wrong because it could shadow something
* useful to the device.
*/
capoff = 256 - roundup(sizeof(msicap), 4);
capdata = (u_char *)&msicap;
for (i = 0; i < sizeof(msicap); i++)
pci_set_cfgdata8(pi, capoff + i, capdata[i]);
return (capoff);
}
#endif /* LEGACY_SUPPORT */
static int
cfginitmsi(struct passthru_softc *sc)
{
int i, ptr, capptr, cap, sts, caplen, table_size;
uint32_t u32;
struct pcisel sel;
struct pci_devinst *pi;
struct msixcap msixcap;
uint32_t *msixcap_ptr;
pi = sc->psc_pi;
sel = sc->psc_sel;
/*
* Parse the capabilities and cache the location of the MSI
* and MSI-X capabilities.
*/
sts = read_config(&sel, PCIR_STATUS, 2);
if (sts & PCIM_STATUS_CAPPRESENT) {
ptr = read_config(&sel, PCIR_CAP_PTR, 1);
while (ptr != 0 && ptr != 0xff) {
cap = read_config(&sel, ptr + PCICAP_ID, 1);
if (cap == PCIY_MSI) {
/*
* Copy the MSI capability into the config
* space of the emulated pci device
*/
sc->psc_msi.capoff = ptr;
sc->psc_msi.msgctrl = read_config(&sel,
ptr + 2, 2);
sc->psc_msi.emulated = 0;
caplen = msi_caplen(sc->psc_msi.msgctrl);
capptr = ptr;
while (caplen > 0) {
u32 = read_config(&sel, capptr, 4);
pci_set_cfgdata32(pi, capptr, u32);
caplen -= 4;
capptr += 4;
}
} else if (cap == PCIY_MSIX) {
/*
* Copy the MSI-X capability
*/
sc->psc_msix.capoff = ptr;
caplen = 12;
msixcap_ptr = (uint32_t*) &msixcap;
capptr = ptr;
while (caplen > 0) {
u32 = read_config(&sel, capptr, 4);
*msixcap_ptr = u32;
pci_set_cfgdata32(pi, capptr, u32);
caplen -= 4;
capptr += 4;
msixcap_ptr++;
}
}
ptr = read_config(&sel, ptr + PCICAP_NEXTPTR, 1);
}
}
if (sc->psc_msix.capoff != 0) {
pi->pi_msix.pba_bar =
msixcap.pba_info & PCIM_MSIX_BIR_MASK;
pi->pi_msix.pba_offset =
msixcap.pba_info & ~PCIM_MSIX_BIR_MASK;
pi->pi_msix.table_bar =
msixcap.table_info & PCIM_MSIX_BIR_MASK;
pi->pi_msix.table_offset =
msixcap.table_info & ~PCIM_MSIX_BIR_MASK;
pi->pi_msix.table_count = MSIX_TABLE_COUNT(msixcap.msgctrl);
pi->pi_msix.pba_size = PBA_SIZE(pi->pi_msix.table_count);
/* Allocate the emulated MSI-X table array */
table_size = pi->pi_msix.table_count * MSIX_TABLE_ENTRY_SIZE;
pi->pi_msix.table = calloc(1, table_size);
/* Mask all table entries */
for (i = 0; i < pi->pi_msix.table_count; i++) {
pi->pi_msix.table[i].vector_control |=
PCIM_MSIX_VCTRL_MASK;
}
}
#ifdef LEGACY_SUPPORT
/*
* If the passthrough device does not support MSI then craft a
* MSI capability for it. We link the new MSI capability at the
* head of the list of capabilities.
*/
if ((sts & PCIM_STATUS_CAPPRESENT) != 0 && sc->psc_msi.capoff == 0) {
int origptr, msiptr;
origptr = read_config(&sel, PCIR_CAP_PTR, 1);
msiptr = passthru_add_msicap(pi, 1, origptr);
sc->psc_msi.capoff = msiptr;
sc->psc_msi.msgctrl = pci_get_cfgdata16(pi, msiptr + 2);
sc->psc_msi.emulated = 1;
pci_set_cfgdata8(pi, PCIR_CAP_PTR, msiptr);
}
#endif
/* Make sure one of the capabilities is present */
if (sc->psc_msi.capoff == 0 && sc->psc_msix.capoff == 0)
return (-1);
else
return (0);
}
static uint64_t
msix_table_read(struct passthru_softc *sc, uint64_t offset, int size)
{
struct pci_devinst *pi;
struct msix_table_entry *entry;
uint8_t *src8;
uint16_t *src16;
uint32_t *src32;
uint64_t *src64;
uint64_t data;
size_t entry_offset;
int index;
pi = sc->psc_pi;
if (offset < pi->pi_msix.table_offset)
return (-1);
offset -= pi->pi_msix.table_offset;
index = offset / MSIX_TABLE_ENTRY_SIZE;
if (index >= pi->pi_msix.table_count)
return (-1);
entry = &pi->pi_msix.table[index];
entry_offset = offset % MSIX_TABLE_ENTRY_SIZE;
switch(size) {
case 1:
src8 = (uint8_t *)((void *)entry + entry_offset);
data = *src8;
break;
case 2:
src16 = (uint16_t *)((void *)entry + entry_offset);
data = *src16;
break;
case 4:
src32 = (uint32_t *)((void *)entry + entry_offset);
data = *src32;
break;
case 8:
src64 = (uint64_t *)((void *)entry + entry_offset);
data = *src64;
break;
default:
return (-1);
}
return (data);
}
static void
msix_table_write(struct vmctx *ctx, int vcpu, struct passthru_softc *sc,
uint64_t offset, int size, uint64_t data)
{
struct pci_devinst *pi;
struct msix_table_entry *entry;
uint32_t *dest;
size_t entry_offset;
uint32_t vector_control;
int error, index;
pi = sc->psc_pi;
if (offset < pi->pi_msix.table_offset)
return;
offset -= pi->pi_msix.table_offset;
index = offset / MSIX_TABLE_ENTRY_SIZE;
if (index >= pi->pi_msix.table_count)
return;
entry = &pi->pi_msix.table[index];
entry_offset = offset % MSIX_TABLE_ENTRY_SIZE;
/* Only 4 byte naturally-aligned writes are supported */
assert(size == 4);
assert(entry_offset % 4 == 0);
vector_control = entry->vector_control;
dest = (uint32_t *)((void *)entry + entry_offset);
*dest = data;
/* If MSI-X hasn't been enabled, do nothing */
if (pi->pi_msix.enabled) {
/* If the entry is masked, don't set it up */
if ((entry->vector_control & PCIM_MSIX_VCTRL_MASK) == 0 ||
(vector_control & PCIM_MSIX_VCTRL_MASK) == 0) {
error = vm_setup_pptdev_msix(ctx, vcpu,
sc->psc_sel.pc_bus, sc->psc_sel.pc_dev,
sc->psc_sel.pc_func, index, entry->addr,
entry->msg_data, entry->vector_control);
}
}
}
static int
init_msix_table(struct vmctx *ctx, struct passthru_softc *sc, uint64_t base)
{
int b, s, f;
int error, idx;
size_t len, remaining;
uint32_t table_size, table_offset;
uint32_t pba_size, pba_offset;
vm_paddr_t start;
struct pci_devinst *pi = sc->psc_pi;
assert(pci_msix_table_bar(pi) >= 0 && pci_msix_pba_bar(pi) >= 0);
b = sc->psc_sel.pc_bus;
s = sc->psc_sel.pc_dev;
f = sc->psc_sel.pc_func;
/*
* If the MSI-X table BAR maps memory intended for
* other uses, it is at least assured that the table
* either resides in its own page within the region,
* or it resides in a page shared with only the PBA.
*/
table_offset = rounddown2(pi->pi_msix.table_offset, 4096);
table_size = pi->pi_msix.table_offset - table_offset;
table_size += pi->pi_msix.table_count * MSIX_TABLE_ENTRY_SIZE;
table_size = roundup2(table_size, 4096);
if (pi->pi_msix.pba_bar == pi->pi_msix.table_bar) {
pba_offset = pi->pi_msix.pba_offset;
pba_size = pi->pi_msix.pba_size;
if (pba_offset >= table_offset + table_size ||
table_offset >= pba_offset + pba_size) {
/*
* The PBA can reside in the same BAR as the MSI-x
* tables as long as it does not overlap with any
* naturally aligned page occupied by the tables.
*/
} else {
/* Need to also emulate the PBA, not supported yet */
printf("Unsupported MSI-X configuration: %d/%d/%d\n",
b, s, f);
return (-1);
}
}
idx = pi->pi_msix.table_bar;
start = pi->pi_bar[idx].addr;
remaining = pi->pi_bar[idx].size;
/* Map everything before the MSI-X table */
if (table_offset > 0) {
len = table_offset;
error = vm_map_pptdev_mmio(ctx, b, s, f, start, len, base);
if (error)
return (error);
base += len;
start += len;
remaining -= len;
}
/* Skip the MSI-X table */
base += table_size;
start += table_size;
remaining -= table_size;
/* Map everything beyond the end of the MSI-X table */
if (remaining > 0) {
len = remaining;
error = vm_map_pptdev_mmio(ctx, b, s, f, start, len, base);
if (error)
return (error);
}
return (0);
}
static int
cfginitbar(struct vmctx *ctx, struct passthru_softc *sc)
{
int i, error;
struct pci_devinst *pi;
struct pci_bar_io bar;
enum pcibar_type bartype;
uint64_t base, size;
pi = sc->psc_pi;
/*
* Initialize BAR registers
*/
for (i = 0; i <= PCI_BARMAX; i++) {
bzero(&bar, sizeof(bar));
bar.pbi_sel = sc->psc_sel;
bar.pbi_reg = PCIR_BAR(i);
if (ioctl(pcifd, PCIOCGETBAR, &bar) < 0)
continue;
if (PCI_BAR_IO(bar.pbi_base)) {
bartype = PCIBAR_IO;
base = bar.pbi_base & PCIM_BAR_IO_BASE;
} else {
switch (bar.pbi_base & PCIM_BAR_MEM_TYPE) {
case PCIM_BAR_MEM_64:
bartype = PCIBAR_MEM64;
break;
default:
bartype = PCIBAR_MEM32;
break;
}
base = bar.pbi_base & PCIM_BAR_MEM_BASE;
}
size = bar.pbi_length;
if (bartype != PCIBAR_IO) {
if (((base | size) & PAGE_MASK) != 0) {
printf("passthru device %d/%d/%d BAR %d: "
"base %#lx or size %#lx not page aligned\n",
sc->psc_sel.pc_bus, sc->psc_sel.pc_dev,
sc->psc_sel.pc_func, i, base, size);
return (-1);
}
}
/* Cache information about the "real" BAR */
sc->psc_bar[i].type = bartype;
sc->psc_bar[i].size = size;
sc->psc_bar[i].addr = base;
/* Allocate the BAR in the guest I/O or MMIO space */
error = pci_emul_alloc_pbar(pi, i, base, bartype, size);
if (error)
return (-1);
/* The MSI-X table needs special handling */
if (i == pci_msix_table_bar(pi)) {
error = init_msix_table(ctx, sc, base);
if (error)
return (-1);
} else if (bartype != PCIBAR_IO) {
/* Map the physical BAR in the guest MMIO space */
error = vm_map_pptdev_mmio(ctx, sc->psc_sel.pc_bus,
sc->psc_sel.pc_dev, sc->psc_sel.pc_func,
pi->pi_bar[i].addr, pi->pi_bar[i].size, base);
if (error)
return (-1);
}
/*
* 64-bit BAR takes up two slots so skip the next one.
*/
if (bartype == PCIBAR_MEM64) {
i++;
assert(i <= PCI_BARMAX);
sc->psc_bar[i].type = PCIBAR_MEMHI64;
}
}
return (0);
}
static int
cfginit(struct vmctx *ctx, struct pci_devinst *pi, int bus, int slot, int func)
{
int error;
struct passthru_softc *sc;
error = 1;
sc = pi->pi_arg;
bzero(&sc->psc_sel, sizeof(struct pcisel));
sc->psc_sel.pc_bus = bus;
sc->psc_sel.pc_dev = slot;
sc->psc_sel.pc_func = func;
if (cfginitmsi(sc) != 0)
goto done;
if (cfginitbar(ctx, sc) != 0)
goto done;
error = 0; /* success */
done:
return (error);
}
static int
passthru_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts)
{
int bus, slot, func, error;
struct passthru_softc *sc;
sc = NULL;
error = 1;
if (pcifd < 0) {
pcifd = open(_PATH_DEVPCI, O_RDWR, 0);
if (pcifd < 0)
goto done;
}
if (iofd < 0) {
iofd = open(_PATH_DEVIO, O_RDWR, 0);
if (iofd < 0)
goto done;
}
if (opts == NULL ||
sscanf(opts, "%d/%d/%d", &bus, &slot, &func) != 3)
goto done;
if (vm_assign_pptdev(ctx, bus, slot, func) != 0)
goto done;
sc = calloc(1, sizeof(struct passthru_softc));
pi->pi_arg = sc;
sc->psc_pi = pi;
/* initialize config space */
if ((error = cfginit(ctx, pi, bus, slot, func)) != 0)
goto done;
error = 0; /* success */
done:
if (error) {
free(sc);
vm_unassign_pptdev(ctx, bus, slot, func);
}
return (error);
}
static int
bar_access(int coff)
{
if (coff >= PCIR_BAR(0) && coff < PCIR_BAR(PCI_BARMAX + 1))
return (1);
else
return (0);
}
static int
msicap_access(struct passthru_softc *sc, int coff)
{
int caplen;
if (sc->psc_msi.capoff == 0)
return (0);
caplen = msi_caplen(sc->psc_msi.msgctrl);
if (coff >= sc->psc_msi.capoff && coff < sc->psc_msi.capoff + caplen)
return (1);
else
return (0);
}
static int
msixcap_access(struct passthru_softc *sc, int coff)
{
if (sc->psc_msix.capoff == 0)
return (0);
return (coff >= sc->psc_msix.capoff &&
coff < sc->psc_msix.capoff + MSIX_CAPLEN);
}
static int
passthru_cfgread(struct vmctx *ctx, int vcpu, struct pci_devinst *pi,
int coff, int bytes, uint32_t *rv)
{
struct passthru_softc *sc;
sc = pi->pi_arg;
/*
* PCI BARs and MSI capability is emulated.
*/
if (bar_access(coff) || msicap_access(sc, coff))
return (-1);
#ifdef LEGACY_SUPPORT
/*
* Emulate PCIR_CAP_PTR if this device does not support MSI capability
* natively.
*/
if (sc->psc_msi.emulated) {
if (coff >= PCIR_CAP_PTR && coff < PCIR_CAP_PTR + 4)
return (-1);
}
#endif
/* Everything else just read from the device's config space */
*rv = read_config(&sc->psc_sel, coff, bytes);
return (0);
}
static int
passthru_cfgwrite(struct vmctx *ctx, int vcpu, struct pci_devinst *pi,
int coff, int bytes, uint32_t val)
{
int error, msix_table_entries, i;
struct passthru_softc *sc;
sc = pi->pi_arg;
/*
* PCI BARs are emulated
*/
if (bar_access(coff))
return (-1);
/*
* MSI capability is emulated
*/
if (msicap_access(sc, coff)) {
msicap_cfgwrite(pi, sc->psc_msi.capoff, coff, bytes, val);
error = vm_setup_pptdev_msi(ctx, vcpu, sc->psc_sel.pc_bus,
sc->psc_sel.pc_dev, sc->psc_sel.pc_func,
pi->pi_msi.addr, pi->pi_msi.msg_data,
pi->pi_msi.maxmsgnum);
if (error != 0) {
printf("vm_setup_pptdev_msi error %d\r\n", errno);
exit(1);
}
return (0);
}
if (msixcap_access(sc, coff)) {
msixcap_cfgwrite(pi, sc->psc_msix.capoff, coff, bytes, val);
if (pi->pi_msix.enabled) {
msix_table_entries = pi->pi_msix.table_count;
for (i = 0; i < msix_table_entries; i++) {
error = vm_setup_pptdev_msix(ctx, vcpu,
sc->psc_sel.pc_bus, sc->psc_sel.pc_dev,
sc->psc_sel.pc_func, i,
pi->pi_msix.table[i].addr,
pi->pi_msix.table[i].msg_data,
pi->pi_msix.table[i].vector_control);
if (error) {
printf("vm_setup_pptdev_msix error "
"%d\r\n", errno);
exit(1);
}
}
}
return (0);
}
#ifdef LEGACY_SUPPORT
/*
* If this device does not support MSI natively then we cannot let
* the guest disable legacy interrupts from the device. It is the
* legacy interrupt that is triggering the virtual MSI to the guest.
*/
if (sc->psc_msi.emulated && pci_msi_enabled(pi)) {
if (coff == PCIR_COMMAND && bytes == 2)
val &= ~PCIM_CMD_INTxDIS;
}
#endif
write_config(&sc->psc_sel, coff, bytes, val);
return (0);
}
static void
passthru_write(struct vmctx *ctx, int vcpu, struct pci_devinst *pi, int baridx,
uint64_t offset, int size, uint64_t value)
{
struct passthru_softc *sc;
struct iodev_pio_req pio;
sc = pi->pi_arg;
if (baridx == pci_msix_table_bar(pi)) {
msix_table_write(ctx, vcpu, sc, offset, size, value);
} else {
assert(pi->pi_bar[baridx].type == PCIBAR_IO);
bzero(&pio, sizeof(struct iodev_pio_req));
pio.access = IODEV_PIO_WRITE;
pio.port = sc->psc_bar[baridx].addr + offset;
pio.width = size;
pio.val = value;
(void)ioctl(iofd, IODEV_PIO, &pio);
}
}
static uint64_t
passthru_read(struct vmctx *ctx, int vcpu, struct pci_devinst *pi, int baridx,
uint64_t offset, int size)
{
struct passthru_softc *sc;
struct iodev_pio_req pio;
uint64_t val;
sc = pi->pi_arg;
if (baridx == pci_msix_table_bar(pi)) {
val = msix_table_read(sc, offset, size);
} else {
assert(pi->pi_bar[baridx].type == PCIBAR_IO);
bzero(&pio, sizeof(struct iodev_pio_req));
pio.access = IODEV_PIO_READ;
pio.port = sc->psc_bar[baridx].addr + offset;
pio.width = size;
pio.val = 0;
(void)ioctl(iofd, IODEV_PIO, &pio);
val = pio.val;
}
return (val);
}
struct pci_devemu passthru = {
.pe_emu = "passthru",
.pe_init = passthru_init,
.pe_cfgwrite = passthru_cfgwrite,
.pe_cfgread = passthru_cfgread,
.pe_barwrite = passthru_write,
.pe_barread = passthru_read,
};
PCI_EMUL_SET(passthru);