* (GNU GPL), version 2 or later.
*/
+#include "qemu/osdep.h"
+#include "sysemu/block-backend.h"
#include "sysemu/dma.h"
#include "trace.h"
-#include "qemu/range.h"
#include "qemu/thread.h"
+#include "qemu/main-loop.h"
/* #define DEBUG_IOMMU */
-static void do_dma_memory_set(AddressSpace *as,
- dma_addr_t addr, uint8_t c, dma_addr_t len)
+int dma_memory_set(AddressSpace *as, dma_addr_t addr, uint8_t c, dma_addr_t len)
{
+ dma_barrier(as, DMA_DIRECTION_FROM_DEVICE);
+
#define FILLBUF_SIZE 512
uint8_t fillbuf[FILLBUF_SIZE];
int l;
+ bool error = false;
memset(fillbuf, c, FILLBUF_SIZE);
while (len > 0) {
l = len < FILLBUF_SIZE ? len : FILLBUF_SIZE;
- address_space_rw(as, addr, fillbuf, l, true);
+ error |= address_space_rw(as, addr, MEMTXATTRS_UNSPECIFIED,
+ fillbuf, l, true);
len -= l;
addr += l;
}
-}
-
-int dma_memory_set(DMAContext *dma, dma_addr_t addr, uint8_t c, dma_addr_t len)
-{
- dma_barrier(dma, DMA_DIRECTION_FROM_DEVICE);
-
- if (dma_has_iommu(dma)) {
- return iommu_dma_memory_set(dma, addr, c, len);
- }
- do_dma_memory_set(dma->as, addr, c, len);
- return 0;
+ return error;
}
-void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint, DMAContext *dma)
+void qemu_sglist_init(QEMUSGList *qsg, DeviceState *dev, int alloc_hint,
+ AddressSpace *as)
{
qsg->sg = g_malloc(alloc_hint * sizeof(ScatterGatherEntry));
qsg->nsg = 0;
qsg->nalloc = alloc_hint;
qsg->size = 0;
- qsg->dma = dma;
+ qsg->as = as;
+ qsg->dev = dev;
+ object_ref(OBJECT(dev));
}
void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len)
void qemu_sglist_destroy(QEMUSGList *qsg)
{
+ object_unref(OBJECT(qsg->dev));
g_free(qsg->sg);
memset(qsg, 0, sizeof(*qsg));
}
typedef struct {
- BlockDriverAIOCB common;
- BlockDriverState *bs;
- BlockDriverAIOCB *acb;
+ BlockAIOCB common;
+ AioContext *ctx;
+ BlockAIOCB *acb;
QEMUSGList *sg;
- uint64_t sector_num;
+ uint64_t offset;
DMADirection dir;
- bool in_cancel;
int sg_cur_index;
dma_addr_t sg_cur_byte;
QEMUIOVector iov;
QEMUBH *bh;
DMAIOFunc *io_func;
+ void *io_func_opaque;
} DMAAIOCB;
-static void dma_bdrv_cb(void *opaque, int ret);
+static void dma_blk_cb(void *opaque, int ret);
static void reschedule_dma(void *opaque)
{
qemu_bh_delete(dbs->bh);
dbs->bh = NULL;
- dma_bdrv_cb(dbs, 0);
-}
-
-static void continue_after_map_failure(void *opaque)
-{
- DMAAIOCB *dbs = (DMAAIOCB *)opaque;
-
- dbs->bh = qemu_bh_new(reschedule_dma, dbs);
- qemu_bh_schedule(dbs->bh);
+ dma_blk_cb(dbs, 0);
}
-static void dma_bdrv_unmap(DMAAIOCB *dbs)
+static void dma_blk_unmap(DMAAIOCB *dbs)
{
int i;
for (i = 0; i < dbs->iov.niov; ++i) {
- dma_memory_unmap(dbs->sg->dma, dbs->iov.iov[i].iov_base,
+ dma_memory_unmap(dbs->sg->as, dbs->iov.iov[i].iov_base,
dbs->iov.iov[i].iov_len, dbs->dir,
dbs->iov.iov[i].iov_len);
}
{
trace_dma_complete(dbs, ret, dbs->common.cb);
- dma_bdrv_unmap(dbs);
+ dma_blk_unmap(dbs);
if (dbs->common.cb) {
dbs->common.cb(dbs->common.opaque, ret);
}
qemu_bh_delete(dbs->bh);
dbs->bh = NULL;
}
- if (!dbs->in_cancel) {
- /* Requests may complete while dma_aio_cancel is in progress. In
- * this case, the AIOCB should not be released because it is still
- * referenced by dma_aio_cancel. */
- qemu_aio_release(dbs);
- }
+ qemu_aio_unref(dbs);
}
-static void dma_bdrv_cb(void *opaque, int ret)
+static void dma_blk_cb(void *opaque, int ret)
{
DMAAIOCB *dbs = (DMAAIOCB *)opaque;
dma_addr_t cur_addr, cur_len;
void *mem;
- trace_dma_bdrv_cb(dbs, ret);
+ trace_dma_blk_cb(dbs, ret);
dbs->acb = NULL;
- dbs->sector_num += dbs->iov.size / 512;
- dma_bdrv_unmap(dbs);
+ dbs->offset += dbs->iov.size;
if (dbs->sg_cur_index == dbs->sg->nsg || ret < 0) {
dma_complete(dbs, ret);
return;
}
+ dma_blk_unmap(dbs);
while (dbs->sg_cur_index < dbs->sg->nsg) {
cur_addr = dbs->sg->sg[dbs->sg_cur_index].base + dbs->sg_cur_byte;
cur_len = dbs->sg->sg[dbs->sg_cur_index].len - dbs->sg_cur_byte;
- mem = dma_memory_map(dbs->sg->dma, cur_addr, &cur_len, dbs->dir);
+ mem = dma_memory_map(dbs->sg->as, cur_addr, &cur_len, dbs->dir);
if (!mem)
break;
qemu_iovec_add(&dbs->iov, mem, cur_len);
if (dbs->iov.size == 0) {
trace_dma_map_wait(dbs);
- cpu_register_map_client(dbs, continue_after_map_failure);
+ dbs->bh = aio_bh_new(dbs->ctx, reschedule_dma, dbs);
+ cpu_register_map_client(dbs->bh);
return;
}
- dbs->acb = dbs->io_func(dbs->bs, dbs->sector_num, &dbs->iov,
- dbs->iov.size / 512, dma_bdrv_cb, dbs);
+ if (dbs->iov.size & ~BDRV_SECTOR_MASK) {
+ qemu_iovec_discard_back(&dbs->iov, dbs->iov.size & ~BDRV_SECTOR_MASK);
+ }
+
+ dbs->acb = dbs->io_func(dbs->offset, &dbs->iov,
+ dma_blk_cb, dbs, dbs->io_func_opaque);
assert(dbs->acb);
}
-static void dma_aio_cancel(BlockDriverAIOCB *acb)
+static void dma_aio_cancel(BlockAIOCB *acb)
{
DMAAIOCB *dbs = container_of(acb, DMAAIOCB, common);
trace_dma_aio_cancel(dbs);
if (dbs->acb) {
- BlockDriverAIOCB *acb = dbs->acb;
- dbs->acb = NULL;
- dbs->in_cancel = true;
- bdrv_aio_cancel(acb);
- dbs->in_cancel = false;
+ blk_aio_cancel_async(dbs->acb);
+ }
+ if (dbs->bh) {
+ cpu_unregister_map_client(dbs->bh);
+ qemu_bh_delete(dbs->bh);
+ dbs->bh = NULL;
}
- dbs->common.cb = NULL;
- dma_complete(dbs, 0);
+}
+
+static AioContext *dma_get_aio_context(BlockAIOCB *acb)
+{
+ DMAAIOCB *dbs = container_of(acb, DMAAIOCB, common);
+
+ return dbs->ctx;
}
static const AIOCBInfo dma_aiocb_info = {
.aiocb_size = sizeof(DMAAIOCB),
- .cancel = dma_aio_cancel,
+ .cancel_async = dma_aio_cancel,
+ .get_aio_context = dma_get_aio_context,
};
-BlockDriverAIOCB *dma_bdrv_io(
- BlockDriverState *bs, QEMUSGList *sg, uint64_t sector_num,
- DMAIOFunc *io_func, BlockDriverCompletionFunc *cb,
+BlockAIOCB *dma_blk_io(AioContext *ctx,
+ QEMUSGList *sg, uint64_t offset,
+ DMAIOFunc *io_func, void *io_func_opaque,
+ BlockCompletionFunc *cb,
void *opaque, DMADirection dir)
{
- DMAAIOCB *dbs = qemu_aio_get(&dma_aiocb_info, bs, cb, opaque);
+ DMAAIOCB *dbs = qemu_aio_get(&dma_aiocb_info, NULL, cb, opaque);
- trace_dma_bdrv_io(dbs, bs, sector_num, (dir == DMA_DIRECTION_TO_DEVICE));
+ trace_dma_blk_io(dbs, io_func_opaque, offset, (dir == DMA_DIRECTION_TO_DEVICE));
dbs->acb = NULL;
- dbs->bs = bs;
dbs->sg = sg;
- dbs->sector_num = sector_num;
+ dbs->ctx = ctx;
+ dbs->offset = offset;
dbs->sg_cur_index = 0;
dbs->sg_cur_byte = 0;
dbs->dir = dir;
dbs->io_func = io_func;
+ dbs->io_func_opaque = io_func_opaque;
dbs->bh = NULL;
qemu_iovec_init(&dbs->iov, sg->nsg);
- dma_bdrv_cb(dbs, 0);
+ dma_blk_cb(dbs, 0);
return &dbs->common;
}
-BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs,
- QEMUSGList *sg, uint64_t sector,
- void (*cb)(void *opaque, int ret), void *opaque)
+static
+BlockAIOCB *dma_blk_read_io_func(int64_t offset, QEMUIOVector *iov,
+ BlockCompletionFunc *cb, void *cb_opaque,
+ void *opaque)
{
- return dma_bdrv_io(bs, sg, sector, bdrv_aio_readv, cb, opaque,
- DMA_DIRECTION_FROM_DEVICE);
+ BlockBackend *blk = opaque;
+ return blk_aio_preadv(blk, offset, iov, 0, cb, cb_opaque);
}
-BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs,
- QEMUSGList *sg, uint64_t sector,
- void (*cb)(void *opaque, int ret), void *opaque)
+BlockAIOCB *dma_blk_read(BlockBackend *blk,
+ QEMUSGList *sg, uint64_t offset,
+ void (*cb)(void *opaque, int ret), void *opaque)
{
- return dma_bdrv_io(bs, sg, sector, bdrv_aio_writev, cb, opaque,
- DMA_DIRECTION_TO_DEVICE);
+ return dma_blk_io(blk_get_aio_context(blk),
+ sg, offset, dma_blk_read_io_func, blk, cb, opaque,
+ DMA_DIRECTION_FROM_DEVICE);
+}
+
+static
+BlockAIOCB *dma_blk_write_io_func(int64_t offset, QEMUIOVector *iov,
+ BlockCompletionFunc *cb, void *cb_opaque,
+ void *opaque)
+{
+ BlockBackend *blk = opaque;
+ return blk_aio_pwritev(blk, offset, iov, 0, cb, cb_opaque);
+}
+
+BlockAIOCB *dma_blk_write(BlockBackend *blk,
+ QEMUSGList *sg, uint64_t offset,
+ void (*cb)(void *opaque, int ret), void *opaque)
+{
+ return dma_blk_io(blk_get_aio_context(blk),
+ sg, offset, dma_blk_write_io_func, blk, cb, opaque,
+ DMA_DIRECTION_TO_DEVICE);
}
while (len > 0) {
ScatterGatherEntry entry = sg->sg[sg_cur_index++];
int32_t xfer = MIN(len, entry.len);
- dma_memory_rw(sg->dma, entry.base, ptr, xfer, dir);
+ dma_memory_rw(sg->as, entry.base, ptr, xfer, dir);
ptr += xfer;
len -= xfer;
resid -= xfer;
return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_TO_DEVICE);
}
-void dma_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
+void dma_acct_start(BlockBackend *blk, BlockAcctCookie *cookie,
QEMUSGList *sg, enum BlockAcctType type)
{
- bdrv_acct_start(bs, cookie, sg->size, type);
-}
-
-bool iommu_dma_memory_valid(DMAContext *dma, dma_addr_t addr, dma_addr_t len,
- DMADirection dir)
-{
- hwaddr paddr, plen;
-
-#ifdef DEBUG_IOMMU
- fprintf(stderr, "dma_memory_check context=%p addr=0x" DMA_ADDR_FMT
- " len=0x" DMA_ADDR_FMT " dir=%d\n", dma, addr, len, dir);
-#endif
-
- while (len) {
- if (dma->translate(dma, addr, &paddr, &plen, dir) != 0) {
- return false;
- }
-
- /* The translation might be valid for larger regions. */
- if (plen > len) {
- plen = len;
- }
-
- if (!address_space_access_valid(dma->as, paddr, len,
- dir == DMA_DIRECTION_FROM_DEVICE)) {
- return false;
- }
-
- len -= plen;
- addr += plen;
- }
-
- return true;
-}
-
-int iommu_dma_memory_rw(DMAContext *dma, dma_addr_t addr,
- void *buf, dma_addr_t len, DMADirection dir)
-{
- hwaddr paddr, plen;
- int err;
-
-#ifdef DEBUG_IOMMU
- fprintf(stderr, "dma_memory_rw context=%p addr=0x" DMA_ADDR_FMT " len=0x"
- DMA_ADDR_FMT " dir=%d\n", dma, addr, len, dir);
-#endif
-
- while (len) {
- err = dma->translate(dma, addr, &paddr, &plen, dir);
- if (err) {
- /*
- * In case of failure on reads from the guest, we clean the
- * destination buffer so that a device that doesn't test
- * for errors will not expose qemu internal memory.
- */
- memset(buf, 0, len);
- return -1;
- }
-
- /* The translation might be valid for larger regions. */
- if (plen > len) {
- plen = len;
- }
-
- address_space_rw(dma->as, paddr, buf, plen, dir == DMA_DIRECTION_FROM_DEVICE);
-
- len -= plen;
- addr += plen;
- buf += plen;
- }
-
- return 0;
-}
-
-int iommu_dma_memory_set(DMAContext *dma, dma_addr_t addr, uint8_t c,
- dma_addr_t len)
-{
- hwaddr paddr, plen;
- int err;
-
-#ifdef DEBUG_IOMMU
- fprintf(stderr, "dma_memory_set context=%p addr=0x" DMA_ADDR_FMT
- " len=0x" DMA_ADDR_FMT "\n", dma, addr, len);
-#endif
-
- while (len) {
- err = dma->translate(dma, addr, &paddr, &plen,
- DMA_DIRECTION_FROM_DEVICE);
- if (err) {
- return err;
- }
-
- /* The translation might be valid for larger regions. */
- if (plen > len) {
- plen = len;
- }
-
- do_dma_memory_set(dma->as, paddr, c, plen);
-
- len -= plen;
- addr += plen;
- }
-
- return 0;
-}
-
-void dma_context_init(DMAContext *dma, AddressSpace *as, DMATranslateFunc translate,
- DMAMapFunc map, DMAUnmapFunc unmap)
-{
-#ifdef DEBUG_IOMMU
- fprintf(stderr, "dma_context_init(%p, %p, %p, %p)\n",
- dma, translate, map, unmap);
-#endif
- dma->as = as;
- dma->translate = translate;
- dma->map = map;
- dma->unmap = unmap;
-}
-
-void *iommu_dma_memory_map(DMAContext *dma, dma_addr_t addr, dma_addr_t *len,
- DMADirection dir)
-{
- int err;
- hwaddr paddr, plen;
- void *buf;
-
- if (dma->map) {
- return dma->map(dma, addr, len, dir);
- }
-
- plen = *len;
- err = dma->translate(dma, addr, &paddr, &plen, dir);
- if (err) {
- return NULL;
- }
-
- /*
- * If this is true, the virtual region is contiguous,
- * but the translated physical region isn't. We just
- * clamp *len, much like address_space_map() does.
- */
- if (plen < *len) {
- *len = plen;
- }
-
- buf = address_space_map(dma->as, paddr, &plen, dir == DMA_DIRECTION_FROM_DEVICE);
- *len = plen;
-
- return buf;
-}
-
-void iommu_dma_memory_unmap(DMAContext *dma, void *buffer, dma_addr_t len,
- DMADirection dir, dma_addr_t access_len)
-{
- if (dma->unmap) {
- dma->unmap(dma, buffer, len, dir, access_len);
- return;
- }
-
- address_space_unmap(dma->as, buffer, len, dir == DMA_DIRECTION_FROM_DEVICE,
- access_len);
-
+ block_acct_start(blk_get_stats(blk), cookie, sg->size, type);
}
projects / qemu.git / blobdiff