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qemu/hw/spapr_llan.c
David Gibson ad0ebb91cd pseries: Convert sPAPR TCEs to use generic IOMMU infrastructure 
The pseries platform already contains an IOMMU implementation, since it is
essential for the platform's paravirtualized VIO devices.  This IOMMU
support is currently built into the implementation of the VIO "bus" and
the various VIO devices.

This patch converts this code to make use of the new common IOMMU
infrastructure.

We don't yet handle synchronization of map/unmap callbacks vs. invalidations,
this will require some complex interaction with the kernel and is not a
major concern at this stage.

Cc: Alex Graf <agraf@suse.de>

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-06-27 16:33:25 -05:00

524 lines
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/*
* QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
*
* PAPR Inter-VM Logical Lan, aka ibmveth
*
* Copyright (c) 2010,2011 David Gibson, IBM Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#include "hw.h"
#include "net.h"
#include "hw/qdev.h"
#include "hw/spapr.h"
#include "hw/spapr_vio.h"
#include <libfdt.h>
#define ETH_ALEN 6
#define MAX_PACKET_SIZE 65536
/*#define DEBUG*/
#ifdef DEBUG
#define dprintf(fmt...) do { fprintf(stderr, fmt); } while (0)
#else
#define dprintf(fmt...)
#endif
/*
* Virtual LAN device
*/
typedef uint64_t vlan_bd_t;
#define VLAN_BD_VALID 0x8000000000000000ULL
#define VLAN_BD_TOGGLE 0x4000000000000000ULL
#define VLAN_BD_NO_CSUM 0x0200000000000000ULL
#define VLAN_BD_CSUM_GOOD 0x0100000000000000ULL
#define VLAN_BD_LEN_MASK 0x00ffffff00000000ULL
#define VLAN_BD_LEN(bd) (((bd) & VLAN_BD_LEN_MASK) >> 32)
#define VLAN_BD_ADDR_MASK 0x00000000ffffffffULL
#define VLAN_BD_ADDR(bd) ((bd) & VLAN_BD_ADDR_MASK)
#define VLAN_VALID_BD(addr, len) (VLAN_BD_VALID | \
(((len) << 32) & VLAN_BD_LEN_MASK) | \
(addr & VLAN_BD_ADDR_MASK))
#define VLAN_RXQC_TOGGLE 0x80
#define VLAN_RXQC_VALID 0x40
#define VLAN_RXQC_NO_CSUM 0x02
#define VLAN_RXQC_CSUM_GOOD 0x01
#define VLAN_RQ_ALIGNMENT 16
#define VLAN_RXQ_BD_OFF 0
#define VLAN_FILTER_BD_OFF 8
#define VLAN_RX_BDS_OFF 16
#define VLAN_MAX_BUFS ((SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF) / 8)
typedef struct VIOsPAPRVLANDevice {
VIOsPAPRDevice sdev;
NICConf nicconf;
NICState *nic;
int isopen;
target_ulong buf_list;
int add_buf_ptr, use_buf_ptr, rx_bufs;
target_ulong rxq_ptr;
} VIOsPAPRVLANDevice;
static int spapr_vlan_can_receive(VLANClientState *nc)
{
VIOsPAPRVLANDevice *dev = DO_UPCAST(NICState, nc, nc)->opaque;
return (dev->isopen && dev->rx_bufs > 0);
}
static ssize_t spapr_vlan_receive(VLANClientState *nc, const uint8_t *buf,
size_t size)
{
VIOsPAPRDevice *sdev = DO_UPCAST(NICState, nc, nc)->opaque;
VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
vlan_bd_t rxq_bd = vio_ldq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF);
vlan_bd_t bd;
int buf_ptr = dev->use_buf_ptr;
uint64_t handle;
uint8_t control;
dprintf("spapr_vlan_receive() [%s] rx_bufs=%d\n", sdev->qdev.id,
dev->rx_bufs);
if (!dev->isopen) {
return -1;
}
if (!dev->rx_bufs) {
return -1;
}
do {
buf_ptr += 8;
if (buf_ptr >= SPAPR_TCE_PAGE_SIZE) {
buf_ptr = VLAN_RX_BDS_OFF;
}
bd = vio_ldq(sdev, dev->buf_list + buf_ptr);
dprintf("use_buf_ptr=%d bd=0x%016llx\n",
buf_ptr, (unsigned long long)bd);
} while ((!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8)))
&& (buf_ptr != dev->use_buf_ptr));
if (!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8))) {
/* Failed to find a suitable buffer */
return -1;
}
/* Remove the buffer from the pool */
dev->rx_bufs--;
dev->use_buf_ptr = buf_ptr;
vio_stq(sdev, dev->buf_list + dev->use_buf_ptr, 0);
dprintf("Found buffer: ptr=%d num=%d\n", dev->use_buf_ptr, dev->rx_bufs);
/* Transfer the packet data */
if (spapr_vio_dma_write(sdev, VLAN_BD_ADDR(bd) + 8, buf, size) < 0) {
return -1;
}
dprintf("spapr_vlan_receive: DMA write completed\n");
/* Update the receive queue */
control = VLAN_RXQC_TOGGLE | VLAN_RXQC_VALID;
if (rxq_bd & VLAN_BD_TOGGLE) {
control ^= VLAN_RXQC_TOGGLE;
}
handle = vio_ldq(sdev, VLAN_BD_ADDR(bd));
vio_stq(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 8, handle);
vio_stl(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 4, size);
vio_sth(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 2, 8);
vio_stb(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr, control);
dprintf("wrote rxq entry (ptr=0x%llx): 0x%016llx 0x%016llx\n",
(unsigned long long)dev->rxq_ptr,
(unsigned long long)vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
dev->rxq_ptr),
(unsigned long long)vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
dev->rxq_ptr + 8));
dev->rxq_ptr += 16;
if (dev->rxq_ptr >= VLAN_BD_LEN(rxq_bd)) {
dev->rxq_ptr = 0;
vio_stq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF, rxq_bd ^ VLAN_BD_TOGGLE);
}
if (sdev->signal_state & 1) {
qemu_irq_pulse(sdev->qirq);
}
return size;
}
static NetClientInfo net_spapr_vlan_info = {
.type = NET_CLIENT_TYPE_NIC,
.size = sizeof(NICState),
.can_receive = spapr_vlan_can_receive,
.receive = spapr_vlan_receive,
};
static void spapr_vlan_reset(VIOsPAPRDevice *sdev)
{
VIOsPAPRVLANDevice *dev = DO_UPCAST(VIOsPAPRVLANDevice, sdev, sdev);
dev->buf_list = 0;
dev->rx_bufs = 0;
dev->isopen = 0;
}
static int spapr_vlan_init(VIOsPAPRDevice *sdev)
{
VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
qemu_macaddr_default_if_unset(&dev->nicconf.macaddr);
dev->nic = qemu_new_nic(&net_spapr_vlan_info, &dev->nicconf,
object_get_typename(OBJECT(sdev)), sdev->qdev.id, dev);
qemu_format_nic_info_str(&dev->nic->nc, dev->nicconf.macaddr.a);
return 0;
}
void spapr_vlan_create(VIOsPAPRBus *bus, NICInfo *nd)
{
DeviceState *dev;
dev = qdev_create(&bus->bus, "spapr-vlan");
qdev_set_nic_properties(dev, nd);
qdev_init_nofail(dev);
}
static int spapr_vlan_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
{
VIOsPAPRVLANDevice *vdev = (VIOsPAPRVLANDevice *)dev;
uint8_t padded_mac[8] = {0, 0};
int ret;
/* Some old phyp versions give the mac address in an 8-byte
* property. The kernel driver has an insane workaround for this;
* rather than doing the obvious thing and checking the property
* length, it checks whether the first byte has 0b10 in the low
* bits. If a correct 6-byte property has a different first byte
* the kernel will get the wrong mac address, overrunning its
* buffer in the process (read only, thank goodness).
*
* Here we workaround the kernel workaround by always supplying an
* 8-byte property, with the mac address in the last six bytes */
memcpy(&padded_mac[2], &vdev->nicconf.macaddr, ETH_ALEN);
ret = fdt_setprop(fdt, node_off, "local-mac-address",
padded_mac, sizeof(padded_mac));
if (ret < 0) {
return ret;
}
ret = fdt_setprop_cell(fdt, node_off, "ibm,mac-address-filters", 0);
if (ret < 0) {
return ret;
}
return 0;
}
static int check_bd(VIOsPAPRVLANDevice *dev, vlan_bd_t bd,
target_ulong alignment)
{
if ((VLAN_BD_ADDR(bd) % alignment)
|| (VLAN_BD_LEN(bd) % alignment)) {
return -1;
}
if (!spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
VLAN_BD_LEN(bd), DMA_DIRECTION_FROM_DEVICE)
|| !spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
VLAN_BD_LEN(bd), DMA_DIRECTION_TO_DEVICE)) {
return -1;
}
return 0;
}
static target_ulong h_register_logical_lan(CPUPPCState *env,
sPAPREnvironment *spapr,
target_ulong opcode,
target_ulong *args)
{
target_ulong reg = args[0];
target_ulong buf_list = args[1];
target_ulong rec_queue = args[2];
target_ulong filter_list = args[3];
VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
vlan_bd_t filter_list_bd;
if (!dev) {
return H_PARAMETER;
}
if (dev->isopen) {
hcall_dprintf("H_REGISTER_LOGICAL_LAN called twice without "
"H_FREE_LOGICAL_LAN\n");
return H_RESOURCE;
}
if (check_bd(dev, VLAN_VALID_BD(buf_list, SPAPR_TCE_PAGE_SIZE),
SPAPR_TCE_PAGE_SIZE) < 0) {
hcall_dprintf("Bad buf_list 0x" TARGET_FMT_lx "\n", buf_list);
return H_PARAMETER;
}
filter_list_bd = VLAN_VALID_BD(filter_list, SPAPR_TCE_PAGE_SIZE);
if (check_bd(dev, filter_list_bd, SPAPR_TCE_PAGE_SIZE) < 0) {
hcall_dprintf("Bad filter_list 0x" TARGET_FMT_lx "\n", filter_list);
return H_PARAMETER;
}
if (!(rec_queue & VLAN_BD_VALID)
|| (check_bd(dev, rec_queue, VLAN_RQ_ALIGNMENT) < 0)) {
hcall_dprintf("Bad receive queue\n");
return H_PARAMETER;
}
dev->buf_list = buf_list;
sdev->signal_state = 0;
rec_queue &= ~VLAN_BD_TOGGLE;
/* Initialize the buffer list */
vio_stq(sdev, buf_list, rec_queue);
vio_stq(sdev, buf_list + 8, filter_list_bd);
spapr_vio_dma_set(sdev, buf_list + VLAN_RX_BDS_OFF, 0,
SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF);
dev->add_buf_ptr = VLAN_RX_BDS_OFF - 8;
dev->use_buf_ptr = VLAN_RX_BDS_OFF - 8;
dev->rx_bufs = 0;
dev->rxq_ptr = 0;
/* Initialize the receive queue */
spapr_vio_dma_set(sdev, VLAN_BD_ADDR(rec_queue), 0, VLAN_BD_LEN(rec_queue));
dev->isopen = 1;
return H_SUCCESS;
}
static target_ulong h_free_logical_lan(CPUPPCState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong reg = args[0];
VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
if (!dev) {
return H_PARAMETER;
}
if (!dev->isopen) {
hcall_dprintf("H_FREE_LOGICAL_LAN called without "
"H_REGISTER_LOGICAL_LAN\n");
return H_RESOURCE;
}
spapr_vlan_reset(sdev);
return H_SUCCESS;
}
static target_ulong h_add_logical_lan_buffer(CPUPPCState *env,
sPAPREnvironment *spapr,
target_ulong opcode,
target_ulong *args)
{
target_ulong reg = args[0];
target_ulong buf = args[1];
VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
vlan_bd_t bd;
dprintf("H_ADD_LOGICAL_LAN_BUFFER(0x" TARGET_FMT_lx
", 0x" TARGET_FMT_lx ")\n", reg, buf);
if (!sdev) {
hcall_dprintf("Bad device\n");
return H_PARAMETER;
}
if ((check_bd(dev, buf, 4) < 0)
|| (VLAN_BD_LEN(buf) < 16)) {
hcall_dprintf("Bad buffer enqueued\n");
return H_PARAMETER;
}
if (!dev->isopen || dev->rx_bufs >= VLAN_MAX_BUFS) {
return H_RESOURCE;
}
do {
dev->add_buf_ptr += 8;
if (dev->add_buf_ptr >= SPAPR_TCE_PAGE_SIZE) {
dev->add_buf_ptr = VLAN_RX_BDS_OFF;
}
bd = vio_ldq(sdev, dev->buf_list + dev->add_buf_ptr);
} while (bd & VLAN_BD_VALID);
vio_stq(sdev, dev->buf_list + dev->add_buf_ptr, buf);
dev->rx_bufs++;
dprintf("h_add_logical_lan_buffer(): Added buf ptr=%d rx_bufs=%d"
" bd=0x%016llx\n", dev->add_buf_ptr, dev->rx_bufs,
(unsigned long long)buf);
return H_SUCCESS;
}
static target_ulong h_send_logical_lan(CPUPPCState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong reg = args[0];
target_ulong *bufs = args + 1;
target_ulong continue_token = args[7];
VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
unsigned total_len;
uint8_t *lbuf, *p;
int i, nbufs;
int ret;
dprintf("H_SEND_LOGICAL_LAN(0x" TARGET_FMT_lx ", <bufs>, 0x"
TARGET_FMT_lx ")\n", reg, continue_token);
if (!sdev) {
return H_PARAMETER;
}
dprintf("rxbufs = %d\n", dev->rx_bufs);
if (!dev->isopen) {
return H_DROPPED;
}
if (continue_token) {
return H_HARDWARE; /* FIXME actually handle this */
}
total_len = 0;
for (i = 0; i < 6; i++) {
dprintf(" buf desc: 0x" TARGET_FMT_lx "\n", bufs[i]);
if (!(bufs[i] & VLAN_BD_VALID)) {
break;
}
total_len += VLAN_BD_LEN(bufs[i]);
}
nbufs = i;
dprintf("h_send_logical_lan() %d buffers, total length 0x%x\n",
nbufs, total_len);
if (total_len == 0) {
return H_SUCCESS;
}
if (total_len > MAX_PACKET_SIZE) {
/* Don't let the guest force too large an allocation */
return H_RESOURCE;
}
lbuf = alloca(total_len);
p = lbuf;
for (i = 0; i < nbufs; i++) {
ret = spapr_vio_dma_read(sdev, VLAN_BD_ADDR(bufs[i]),
p, VLAN_BD_LEN(bufs[i]));
if (ret < 0) {
return ret;
}
p += VLAN_BD_LEN(bufs[i]);
}
qemu_send_packet(&dev->nic->nc, lbuf, total_len);
return H_SUCCESS;
}
static target_ulong h_multicast_ctrl(CPUPPCState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong reg = args[0];
VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
if (!dev) {
return H_PARAMETER;
}
return H_SUCCESS;
}
static Property spapr_vlan_properties[] = {
DEFINE_SPAPR_PROPERTIES(VIOsPAPRVLANDevice, sdev),
DEFINE_NIC_PROPERTIES(VIOsPAPRVLANDevice, nicconf),
DEFINE_PROP_END_OF_LIST(),
};
static void spapr_vlan_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
k->init = spapr_vlan_init;
k->reset = spapr_vlan_reset;
k->devnode = spapr_vlan_devnode;
k->dt_name = "l-lan";
k->dt_type = "network";
k->dt_compatible = "IBM,l-lan";
k->signal_mask = 0x1;
dc->props = spapr_vlan_properties;
k->rtce_window_size = 0x10000000;
}
static TypeInfo spapr_vlan_info = {
.name = "spapr-vlan",
.parent = TYPE_VIO_SPAPR_DEVICE,
.instance_size = sizeof(VIOsPAPRVLANDevice),
.class_init = spapr_vlan_class_init,
};
static void spapr_vlan_register_types(void)
{
spapr_register_hypercall(H_REGISTER_LOGICAL_LAN, h_register_logical_lan);
spapr_register_hypercall(H_FREE_LOGICAL_LAN, h_free_logical_lan);
spapr_register_hypercall(H_SEND_LOGICAL_LAN, h_send_logical_lan);
spapr_register_hypercall(H_ADD_LOGICAL_LAN_BUFFER,
h_add_logical_lan_buffer);
spapr_register_hypercall(H_MULTICAST_CTRL, h_multicast_ctrl);
type_register_static(&spapr_vlan_info);
}
type_init(spapr_vlan_register_types)
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