* (GNU GPL), version 2 or later.
*/
-#include "dma.h"
+#include "sysemu/dma.h"
+#include "trace.h"
+#include "qemu/range.h"
+#include "qemu/thread.h"
+/* #define DEBUG_IOMMU */
-void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint)
+static void do_dma_memory_set(AddressSpace *as,
+ dma_addr_t addr, uint8_t c, dma_addr_t len)
{
- qsg->sg = qemu_malloc(alloc_hint * sizeof(ScatterGatherEntry));
+#define FILLBUF_SIZE 512
+ uint8_t fillbuf[FILLBUF_SIZE];
+ int l;
+
+ memset(fillbuf, c, FILLBUF_SIZE);
+ while (len > 0) {
+ l = len < FILLBUF_SIZE ? len : FILLBUF_SIZE;
+ address_space_rw(as, addr, 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;
+}
+
+void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint, DMAContext *dma)
+{
+ qsg->sg = g_malloc(alloc_hint * sizeof(ScatterGatherEntry));
qsg->nsg = 0;
qsg->nalloc = alloc_hint;
qsg->size = 0;
+ qsg->dma = dma;
}
-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);
+ memset(qsg, 0, sizeof(*qsg));
+}
+
+typedef struct {
+ BlockDriverAIOCB common;
+ BlockDriverState *bs;
+ BlockDriverAIOCB *acb;
+ QEMUSGList *sg;
+ uint64_t sector_num;
+ DMADirection dir;
+ bool in_cancel;
+ int sg_cur_index;
+ dma_addr_t sg_cur_byte;
+ QEMUIOVector iov;
+ QEMUBH *bh;
+ DMAIOFunc *io_func;
+} DMAAIOCB;
+
+static void dma_bdrv_cb(void *opaque, int ret);
+
+static void reschedule_dma(void *opaque)
+{
+ DMAAIOCB *dbs = (DMAAIOCB *)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);
+}
+
+static void dma_bdrv_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,
+ dbs->iov.iov[i].iov_len, dbs->dir,
+ dbs->iov.iov[i].iov_len);
+ }
+ qemu_iovec_reset(&dbs->iov);
+}
+
+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);
+ 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;
+ dma_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 = dma_memory_map(dbs->sg->dma, cur_addr, &cur_len, dbs->dir);
+ if (!mem)
+ break;
+ qemu_iovec_add(&dbs->iov, mem, cur_len);
+ dbs->sg_cur_byte += cur_len;
+ if (dbs->sg_cur_byte == dbs->sg->sg[dbs->sg_cur_index].len) {
+ dbs->sg_cur_byte = 0;
+ ++dbs->sg_cur_index;
+ }
+ }
+
+ if (dbs->iov.size == 0) {
+ trace_dma_map_wait(dbs);
+ cpu_register_map_client(dbs, continue_after_map_failure);
+ return;
+ }
+
+ dbs->acb = dbs->io_func(dbs->bs, dbs->sector_num, &dbs->iov,
+ dbs->iov.size / 512, dma_bdrv_cb, dbs);
+ assert(dbs->acb);
+}
+
+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 const AIOCBInfo dma_aiocb_info = {
+ .aiocb_size = sizeof(DMAAIOCB),
+ .cancel = dma_aio_cancel,
+};
+
+BlockDriverAIOCB *dma_bdrv_io(
+ BlockDriverState *bs, QEMUSGList *sg, uint64_t sector_num,
+ DMAIOFunc *io_func, BlockDriverCompletionFunc *cb,
+ void *opaque, DMADirection dir)
+{
+ DMAAIOCB *dbs = qemu_aio_get(&dma_aiocb_info, bs, cb, opaque);
+
+ trace_dma_bdrv_io(dbs, bs, sector_num, (dir == DMA_DIRECTION_TO_DEVICE));
+
+ dbs->acb = NULL;
+ dbs->bs = bs;
+ dbs->sg = sg;
+ dbs->sector_num = sector_num;
+ dbs->sg_cur_index = 0;
+ dbs->sg_cur_byte = 0;
+ dbs->dir = dir;
+ dbs->io_func = io_func;
+ dbs->bh = NULL;
+ qemu_iovec_init(&dbs->iov, sg->nsg);
+ dma_bdrv_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)
+{
+ return dma_bdrv_io(bs, sg, sector, bdrv_aio_readv, cb, opaque,
+ DMA_DIRECTION_FROM_DEVICE);
+}
+
+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, bdrv_aio_writev, cb, opaque,
+ DMA_DIRECTION_TO_DEVICE);
}
+
+static uint64_t dma_buf_rw(uint8_t *ptr, int32_t len, QEMUSGList *sg,
+ DMADirection dir)
+{
+ uint64_t resid;
+ int sg_cur_index;
+
+ resid = sg->size;
+ sg_cur_index = 0;
+ len = MIN(len, resid);
+ 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);
+ ptr += xfer;
+ len -= xfer;
+ resid -= xfer;
+ }
+
+ return resid;
+}
+
+uint64_t dma_buf_read(uint8_t *ptr, int32_t len, QEMUSGList *sg)
+{
+ return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_FROM_DEVICE);
+}
+
+uint64_t dma_buf_write(uint8_t *ptr, int32_t len, QEMUSGList *sg)
+{
+ return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_TO_DEVICE);
+}
+
+void dma_acct_start(BlockDriverState *bs, 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;
+ }
+
+ 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);
+
+}
projects / qemu.git / blobdiff