#include "dma.h"
#include "block_int.h"
-
-static AIOPool dma_aio_pool;
+#include "trace.h"
void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint)
{
- qsg->sg = qemu_malloc(alloc_hint * sizeof(ScatterGatherEntry));
+ qsg->sg = g_malloc(alloc_hint * sizeof(ScatterGatherEntry));
qsg->nsg = 0;
qsg->nalloc = alloc_hint;
qsg->size = 0;
}
-void qemu_sglist_add(QEMUSGList *qsg, target_phys_addr_t base,
- target_phys_addr_t len)
+void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len)
{
if (qsg->nsg == qsg->nalloc) {
qsg->nalloc = 2 * qsg->nalloc + 1;
- qsg->sg = qemu_realloc(qsg->sg, qsg->nalloc * sizeof(ScatterGatherEntry));
+ qsg->sg = g_realloc(qsg->sg, qsg->nalloc * sizeof(ScatterGatherEntry));
}
qsg->sg[qsg->nsg].base = base;
qsg->sg[qsg->nsg].len = len;
void qemu_sglist_destroy(QEMUSGList *qsg)
{
- qemu_free(qsg->sg);
+ g_free(qsg->sg);
}
typedef struct {
BlockDriverAIOCB *acb;
QEMUSGList *sg;
uint64_t sector_num;
- int is_write;
+ bool to_dev;
+ bool in_cancel;
int sg_cur_index;
- target_phys_addr_t sg_cur_byte;
+ dma_addr_t sg_cur_byte;
QEMUIOVector iov;
QEMUBH *bh;
+ DMAIOFunc *io_func;
} DMAAIOCB;
static void dma_bdrv_cb(void *opaque, int ret);
qemu_bh_delete(dbs->bh);
dbs->bh = NULL;
- dma_bdrv_cb(opaque, 0);
+ dma_bdrv_cb(dbs, 0);
}
static void continue_after_map_failure(void *opaque)
qemu_bh_schedule(dbs->bh);
}
-static void dma_bdrv_cb(void *opaque, int ret)
+static void dma_bdrv_unmap(DMAAIOCB *dbs)
{
- DMAAIOCB *dbs = (DMAAIOCB *)opaque;
- target_phys_addr_t cur_addr, cur_len;
- void *mem;
int i;
- dbs->acb = NULL;
- dbs->sector_num += dbs->iov.size / 512;
for (i = 0; i < dbs->iov.niov; ++i) {
cpu_physical_memory_unmap(dbs->iov.iov[i].iov_base,
- dbs->iov.iov[i].iov_len, !dbs->is_write,
+ dbs->iov.iov[i].iov_len, !dbs->to_dev,
dbs->iov.iov[i].iov_len);
}
qemu_iovec_reset(&dbs->iov);
+}
- if (dbs->sg_cur_index == dbs->sg->nsg || ret < 0) {
+static void dma_complete(DMAAIOCB *dbs, int ret)
+{
+ trace_dma_complete(dbs, ret, dbs->common.cb);
+
+ dma_bdrv_unmap(dbs);
+ if (dbs->common.cb) {
dbs->common.cb(dbs->common.opaque, ret);
- qemu_iovec_destroy(&dbs->iov);
+ }
+ qemu_iovec_destroy(&dbs->iov);
+ if (dbs->bh) {
+ 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);
+ }
+}
+
+static void dma_bdrv_cb(void *opaque, int ret)
+{
+ DMAAIOCB *dbs = (DMAAIOCB *)opaque;
+ target_phys_addr_t cur_addr, cur_len;
+ void *mem;
+
+ trace_dma_bdrv_cb(dbs, ret);
+
+ dbs->acb = NULL;
+ dbs->sector_num += dbs->iov.size / 512;
+ dma_bdrv_unmap(dbs);
+
+ if (dbs->sg_cur_index == dbs->sg->nsg || ret < 0) {
+ dma_complete(dbs, ret);
return;
}
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 = cpu_physical_memory_map(cur_addr, &cur_len, !dbs->is_write);
+ mem = cpu_physical_memory_map(cur_addr, &cur_len, !dbs->to_dev);
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);
return;
}
- if (dbs->is_write) {
- dbs->acb = bdrv_aio_writev(dbs->bs, dbs->sector_num, &dbs->iov,
- dbs->iov.size / 512, dma_bdrv_cb, dbs);
- } else {
- dbs->acb = bdrv_aio_readv(dbs->bs, dbs->sector_num, &dbs->iov,
- dbs->iov.size / 512, dma_bdrv_cb, dbs);
+ dbs->acb = dbs->io_func(dbs->bs, dbs->sector_num, &dbs->iov,
+ dbs->iov.size / 512, dma_bdrv_cb, dbs);
+ if (!dbs->acb) {
+ dma_complete(dbs, -EIO);
}
}
-static BlockDriverAIOCB *dma_bdrv_io(
+static void dma_aio_cancel(BlockDriverAIOCB *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;
+ }
+ dbs->common.cb = NULL;
+ dma_complete(dbs, 0);
+}
+
+static AIOPool dma_aio_pool = {
+ .aiocb_size = sizeof(DMAAIOCB),
+ .cancel = dma_aio_cancel,
+};
+
+BlockDriverAIOCB *dma_bdrv_io(
BlockDriverState *bs, QEMUSGList *sg, uint64_t sector_num,
- BlockDriverCompletionFunc *cb, void *opaque,
- int is_write)
+ DMAIOFunc *io_func, BlockDriverCompletionFunc *cb,
+ void *opaque, bool to_dev)
{
- DMAAIOCB *dbs = qemu_aio_get_pool(&dma_aio_pool, bs, cb, opaque);
+ DMAAIOCB *dbs = qemu_aio_get(&dma_aio_pool, bs, cb, opaque);
+
+ trace_dma_bdrv_io(dbs, bs, sector_num, to_dev);
dbs->acb = NULL;
dbs->bs = bs;
dbs->sector_num = sector_num;
dbs->sg_cur_index = 0;
dbs->sg_cur_byte = 0;
- dbs->is_write = is_write;
+ dbs->to_dev = to_dev;
+ dbs->io_func = io_func;
dbs->bh = NULL;
qemu_iovec_init(&dbs->iov, sg->nsg);
dma_bdrv_cb(dbs, 0);
QEMUSGList *sg, uint64_t sector,
void (*cb)(void *opaque, int ret), void *opaque)
{
- return dma_bdrv_io(bs, sg, sector, cb, opaque, 0);
+ return dma_bdrv_io(bs, sg, sector, bdrv_aio_readv, cb, opaque, false);
}
BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs,
QEMUSGList *sg, uint64_t sector,
void (*cb)(void *opaque, int ret), void *opaque)
{
- return dma_bdrv_io(bs, sg, sector, cb, opaque, 1);
-}
-
-static void dma_aio_cancel(BlockDriverAIOCB *acb)
-{
- DMAAIOCB *dbs = container_of(acb, DMAAIOCB, common);
-
- if (dbs->acb) {
- bdrv_aio_cancel(dbs->acb);
- }
-}
-
-void dma_helper_init(void)
-{
- aio_pool_init(&dma_aio_pool, sizeof(DMAAIOCB), dma_aio_cancel);
+ return dma_bdrv_io(bs, sg, sector, bdrv_aio_writev, cb, opaque, true);
}
projects / qemu.git / blobdiff