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qemu/hw/ide/pci.c

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/*
* QEMU IDE Emulation: PCI Bus support.
*
* Copyright (c) 2003 Fabrice Bellard
* Copyright (c) 2006 Openedhand Ltd.
*
* 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/hw.h>
#include <hw/pc.h>
#include <hw/pci.h>
#include <hw/isa.h>
#include "block.h"
#include "dma.h"
#include <hw/ide/pci.h>
#define BMDMA_PAGE_SIZE 4096
static void bmdma_start_dma(IDEDMA *dma, IDEState *s,
BlockDriverCompletionFunc *dma_cb)
{
BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
bm->unit = s->unit;
bm->dma_cb = dma_cb;
bm->cur_prd_last = 0;
bm->cur_prd_addr = 0;
bm->cur_prd_len = 0;
bm->sector_num = ide_get_sector(s);
bm->nsector = s->nsector;
if (bm->status & BM_STATUS_DMAING) {
bm->dma_cb(bmdma_active_if(bm), 0);
}
}
/* return 0 if buffer completed */
static int bmdma_prepare_buf(IDEDMA *dma, int is_write)
{
BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
IDEState *s = bmdma_active_if(bm);
struct {
uint32_t addr;
uint32_t size;
} prd;
int l, len;
pci_dma_sglist_init(&s->sg, &bm->pci_dev->dev,
s->nsector / (BMDMA_PAGE_SIZE / 512) + 1);
s->io_buffer_size = 0;
for(;;) {
if (bm->cur_prd_len == 0) {
/* end of table (with a fail safe of one page) */
if (bm->cur_prd_last ||
(bm->cur_addr - bm->addr) >= BMDMA_PAGE_SIZE)
return s->io_buffer_size != 0;
pci_dma_read(&bm->pci_dev->dev, bm->cur_addr, &prd, 8);
bm->cur_addr += 8;
prd.addr = le32_to_cpu(prd.addr);
prd.size = le32_to_cpu(prd.size);
len = prd.size & 0xfffe;
if (len == 0)
len = 0x10000;
bm->cur_prd_len = len;
bm->cur_prd_addr = prd.addr;
bm->cur_prd_last = (prd.size & 0x80000000);
}
l = bm->cur_prd_len;
if (l > 0) {
qemu_sglist_add(&s->sg, bm->cur_prd_addr, l);
bm->cur_prd_addr += l;
bm->cur_prd_len -= l;
s->io_buffer_size += l;
}
}
return 1;
}
/* return 0 if buffer completed */
static int bmdma_rw_buf(IDEDMA *dma, int is_write)
{
BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
IDEState *s = bmdma_active_if(bm);
struct {
uint32_t addr;
uint32_t size;
} prd;
int l, len;
for(;;) {
l = s->io_buffer_size - s->io_buffer_index;
if (l <= 0)
break;
if (bm->cur_prd_len == 0) {
/* end of table (with a fail safe of one page) */
if (bm->cur_prd_last ||
(bm->cur_addr - bm->addr) >= BMDMA_PAGE_SIZE)
return 0;
pci_dma_read(&bm->pci_dev->dev, bm->cur_addr, &prd, 8);
bm->cur_addr += 8;
prd.addr = le32_to_cpu(prd.addr);
prd.size = le32_to_cpu(prd.size);
len = prd.size & 0xfffe;
if (len == 0)
len = 0x10000;
bm->cur_prd_len = len;
bm->cur_prd_addr = prd.addr;
bm->cur_prd_last = (prd.size & 0x80000000);
}
if (l > bm->cur_prd_len)
l = bm->cur_prd_len;
if (l > 0) {
if (is_write) {
pci_dma_write(&bm->pci_dev->dev, bm->cur_prd_addr,
s->io_buffer + s->io_buffer_index, l);
} else {
pci_dma_read(&bm->pci_dev->dev, bm->cur_prd_addr,
s->io_buffer + s->io_buffer_index, l);
}
bm->cur_prd_addr += l;
bm->cur_prd_len -= l;
s->io_buffer_index += l;
}
}
return 1;
}
static int bmdma_set_unit(IDEDMA *dma, int unit)
{
BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
bm->unit = unit;
return 0;
}
static int bmdma_add_status(IDEDMA *dma, int status)
{
BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
bm->status |= status;
return 0;
}
static int bmdma_set_inactive(IDEDMA *dma)
{
BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
bm->status &= ~BM_STATUS_DMAING;
bm->dma_cb = NULL;
bm->unit = -1;
return 0;
}
static void bmdma_restart_dma(BMDMAState *bm, enum ide_dma_cmd dma_cmd)
{
IDEState *s = bmdma_active_if(bm);
ide_set_sector(s, bm->sector_num);
s->io_buffer_index = 0;
s->io_buffer_size = 0;
s->nsector = bm->nsector;
s->dma_cmd = dma_cmd;
bm->cur_addr = bm->addr;
bm->dma_cb = ide_dma_cb;
bmdma_start_dma(&bm->dma, s, bm->dma_cb);
}
/* TODO This should be common IDE code */
static void bmdma_restart_bh(void *opaque)
{
BMDMAState *bm = opaque;
IDEBus *bus = bm->bus;
int is_read;
int error_status;
qemu_bh_delete(bm->bh);
bm->bh = NULL;
if (bm->unit == (uint8_t) -1) {
return;
}
is_read = !!(bus->error_status & BM_STATUS_RETRY_READ);
/* The error status must be cleared before resubmitting the request: The
* request may fail again, and this case can only be distinguished if the
* called function can set a new error status. */
error_status = bus->error_status;
bus->error_status = 0;
if (error_status & BM_STATUS_DMA_RETRY) {
if (error_status & BM_STATUS_RETRY_TRIM) {
bmdma_restart_dma(bm, IDE_DMA_TRIM);
} else {
bmdma_restart_dma(bm, is_read ? IDE_DMA_READ : IDE_DMA_WRITE);
}
} else if (error_status & BM_STATUS_PIO_RETRY) {
if (is_read) {
ide_sector_read(bmdma_active_if(bm));
} else {
ide_sector_write(bmdma_active_if(bm));
}
} else if (error_status & BM_STATUS_RETRY_FLUSH) {
ide_flush_cache(bmdma_active_if(bm));
}
}
static void bmdma_restart_cb(void *opaque, int running, RunState state)
{
IDEDMA *dma = opaque;
BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
if (!running)
return;
if (!bm->bh) {
bm->bh = qemu_bh_new(bmdma_restart_bh, &bm->dma);
qemu_bh_schedule(bm->bh);
}
}
static void bmdma_cancel(BMDMAState *bm)
{
if (bm->status & BM_STATUS_DMAING) {
/* cancel DMA request */
bmdma_set_inactive(&bm->dma);
}
}
static int bmdma_reset(IDEDMA *dma)
{
BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
#ifdef DEBUG_IDE
printf("ide: dma_reset\n");
#endif
bmdma_cancel(bm);
bm->cmd = 0;
bm->status = 0;
bm->addr = 0;
bm->cur_addr = 0;
bm->cur_prd_last = 0;
bm->cur_prd_addr = 0;
bm->cur_prd_len = 0;
bm->sector_num = 0;
bm->nsector = 0;
return 0;
}
static int bmdma_start_transfer(IDEDMA *dma)
{
return 0;
}
static void bmdma_irq(void *opaque, int n, int level)
{
BMDMAState *bm = opaque;
if (!level) {
/* pass through lower */
qemu_set_irq(bm->irq, level);
return;
}
bm->status |= BM_STATUS_INT;
/* trigger the real irq */
qemu_set_irq(bm->irq, level);
}
void bmdma_cmd_writeb(BMDMAState *bm, uint32_t val)
{
#ifdef DEBUG_IDE
printf("%s: 0x%08x\n", __func__, val);
#endif
/* Ignore writes to SSBM if it keeps the old value */
if ((val & BM_CMD_START) != (bm->cmd & BM_CMD_START)) {
if (!(val & BM_CMD_START)) {
/*
* We can't cancel Scatter Gather DMA in the middle of the
* operation or a partial (not full) DMA transfer would reach
* the storage so we wait for completion instead (we beahve
* like if the DMA was completed by the time the guest trying
* to cancel dma with bmdma_cmd_writeb with BM_CMD_START not
* set).
*
* In the future we'll be able to safely cancel the I/O if the
* whole DMA operation will be submitted to disk with a single
* aio operation with preadv/pwritev.
*/
if (bm->bus->dma->aiocb) {
bdrv_drain_all();
assert(bm->bus->dma->aiocb == NULL);
assert((bm->status & BM_STATUS_DMAING) == 0);
}
} else {
bm->cur_addr = bm->addr;
if (!(bm->status & BM_STATUS_DMAING)) {
bm->status |= BM_STATUS_DMAING;
/* start dma transfer if possible */
if (bm->dma_cb)
bm->dma_cb(bmdma_active_if(bm), 0);
}
}
}
bm->cmd = val & 0x09;
}
static uint64_t bmdma_addr_read(void *opaque, dma_addr_t addr,
unsigned width)
{
BMDMAState *bm = opaque;
uint32_t mask = (1ULL << (width * 8)) - 1;
uint64_t data;
data = (bm->addr >> (addr * 8)) & mask;
#ifdef DEBUG_IDE
printf("%s: 0x%08x\n", __func__, (unsigned)*data);
#endif
return data;
}
static void bmdma_addr_write(void *opaque, dma_addr_t addr,
uint64_t data, unsigned width)
{
BMDMAState *bm = opaque;
int shift = addr * 8;
uint32_t mask = (1ULL << (width * 8)) - 1;
#ifdef DEBUG_IDE
printf("%s: 0x%08x\n", __func__, (unsigned)data);
#endif
bm->addr &= ~(mask << shift);
bm->addr |= ((data & mask) << shift) & ~3;
}
MemoryRegionOps bmdma_addr_ioport_ops = {
.read = bmdma_addr_read,
.write = bmdma_addr_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static bool ide_bmdma_current_needed(void *opaque)
{
BMDMAState *bm = opaque;
return (bm->cur_prd_len != 0);
}
static bool ide_bmdma_status_needed(void *opaque)
{
BMDMAState *bm = opaque;
/* Older versions abused some bits in the status register for internal
* error state. If any of these bits are set, we must add a subsection to
* transfer the real status register */
uint8_t abused_bits = BM_MIGRATION_COMPAT_STATUS_BITS;
return ((bm->status & abused_bits) != 0);
}
static void ide_bmdma_pre_save(void *opaque)
{
BMDMAState *bm = opaque;
uint8_t abused_bits = BM_MIGRATION_COMPAT_STATUS_BITS;
bm->migration_compat_status =
(bm->status & ~abused_bits) | (bm->bus->error_status & abused_bits);
}
/* This function accesses bm->bus->error_status which is loaded only after
* BMDMA itself. This is why the function is called from ide_pci_post_load
* instead of being registered with VMState where it would run too early. */
static int ide_bmdma_post_load(void *opaque, int version_id)
{
BMDMAState *bm = opaque;
uint8_t abused_bits = BM_MIGRATION_COMPAT_STATUS_BITS;
if (bm->status == 0) {
bm->status = bm->migration_compat_status & ~abused_bits;
bm->bus->error_status |= bm->migration_compat_status & abused_bits;
}
return 0;
}
static const VMStateDescription vmstate_bmdma_current = {
.name = "ide bmdma_current",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField []) {
VMSTATE_UINT32(cur_addr, BMDMAState),
VMSTATE_UINT32(cur_prd_last, BMDMAState),
VMSTATE_UINT32(cur_prd_addr, BMDMAState),
VMSTATE_UINT32(cur_prd_len, BMDMAState),
VMSTATE_END_OF_LIST()
}
};
const VMStateDescription vmstate_bmdma_status = {
.name ="ide bmdma/status",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField []) {
VMSTATE_UINT8(status, BMDMAState),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_bmdma = {
.name = "ide bmdma",
.version_id = 3,
.minimum_version_id = 0,
.minimum_version_id_old = 0,
.pre_save = ide_bmdma_pre_save,
.fields = (VMStateField []) {
VMSTATE_UINT8(cmd, BMDMAState),
VMSTATE_UINT8(migration_compat_status, BMDMAState),
VMSTATE_UINT32(addr, BMDMAState),
VMSTATE_INT64(sector_num, BMDMAState),
VMSTATE_UINT32(nsector, BMDMAState),
VMSTATE_UINT8(unit, BMDMAState),
VMSTATE_END_OF_LIST()
},
.subsections = (VMStateSubsection []) {
{
.vmsd = &vmstate_bmdma_current,
.needed = ide_bmdma_current_needed,
}, {
.vmsd = &vmstate_bmdma_status,
.needed = ide_bmdma_status_needed,
}, {
/* empty */
}
}
};
static int ide_pci_post_load(void *opaque, int version_id)
{
PCIIDEState *d = opaque;
int i;
for(i = 0; i < 2; i++) {
/* current versions always store 0/1, but older version
stored bigger values. We only need last bit */
d->bmdma[i].unit &= 1;
ide_bmdma_post_load(&d->bmdma[i], -1);
}
return 0;
}
const VMStateDescription vmstate_ide_pci = {
.name = "ide",
.version_id = 3,
.minimum_version_id = 0,
.minimum_version_id_old = 0,
.post_load = ide_pci_post_load,
.fields = (VMStateField []) {
VMSTATE_PCI_DEVICE(dev, PCIIDEState),
VMSTATE_STRUCT_ARRAY(bmdma, PCIIDEState, 2, 0,
vmstate_bmdma, BMDMAState),
VMSTATE_IDE_BUS_ARRAY(bus, PCIIDEState, 2),
VMSTATE_IDE_DRIVES(bus[0].ifs, PCIIDEState),
VMSTATE_IDE_DRIVES(bus[1].ifs, PCIIDEState),
VMSTATE_END_OF_LIST()
}
};
void pci_ide_create_devs(PCIDevice *dev, DriveInfo **hd_table)
{
PCIIDEState *d = DO_UPCAST(PCIIDEState, dev, dev);
static const int bus[4] = { 0, 0, 1, 1 };
static const int unit[4] = { 0, 1, 0, 1 };
int i;
for (i = 0; i < 4; i++) {
if (hd_table[i] == NULL)
continue;
ide_create_drive(d->bus+bus[i], unit[i], hd_table[i]);
}
}
static const struct IDEDMAOps bmdma_ops = {
.start_dma = bmdma_start_dma,
.start_transfer = bmdma_start_transfer,
.prepare_buf = bmdma_prepare_buf,
.rw_buf = bmdma_rw_buf,
.set_unit = bmdma_set_unit,
.add_status = bmdma_add_status,
.set_inactive = bmdma_set_inactive,
.restart_cb = bmdma_restart_cb,
.reset = bmdma_reset,
};
void bmdma_init(IDEBus *bus, BMDMAState *bm, PCIIDEState *d)
{
qemu_irq *irq;
if (bus->dma == &bm->dma) {
return;
}
bm->dma.ops = &bmdma_ops;
bus->dma = &bm->dma;
bm->irq = bus->irq;
irq = qemu_allocate_irqs(bmdma_irq, bm, 1);
bus->irq = *irq;
bm->pci_dev = d;
}
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