From c65bcef30659442a45ed0842de80d246d0162fd7 Mon Sep 17 00:00:00 2001 From: David Gibson Date: Wed, 27 Jun 2012 14:50:40 +1000 Subject: [PATCH] iommu: Make sglists and dma_bdrv helpers use new universal DMA helpers dma-helpers.c contains a number of helper functions for doing scatter/gather DMA, and various block device related DMA. Currently, these directly access guest memory using cpu_physical_memory_*(), assuming no IOMMU translation. This patch updates this code to use the new universal DMA helper functions. qemu_sglist_init() now takes a DMAContext * to describe the DMA address space in which the scatter/gather will take place. We minimally update the callers qemu_sglist_init() to pass NULL (i.e. no translation, same as current behaviour). Some of those callers should pass something else in some cases to allow proper IOMMU translation in future, but that will be fixed in later patches. Cc: Kevin Wolf Cc: Michael S. Tsirkin Cc: Paolo Bonzini Signed-off-by: David Gibson Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Anthony Liguori --- dma-helpers.c | 24 ++++++++++++------------ dma.h | 3 ++- hw/ide/ahci.c | 3 ++- hw/ide/macio.c | 4 ++-- hw/pci.h | 2 +- 5 files changed, 19 insertions(+), 17 deletions(-) diff --git a/dma-helpers.c b/dma-helpers.c index 5265132..4c9e529 100644 --- a/dma-helpers.c +++ b/dma-helpers.c @@ -26,12 +26,13 @@ int dma_memory_set(DMAContext *dma, dma_addr_t addr, uint8_t c, dma_addr_t len) return 0; } -void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint) +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, dma_addr_t base, dma_addr_t len) @@ -90,10 +91,9 @@ static void dma_bdrv_unmap(DMAAIOCB *dbs) int i; 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->dir != DMA_DIRECTION_TO_DEVICE, - dbs->iov.iov[i].iov_len); + 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); } @@ -122,7 +122,7 @@ static void dma_complete(DMAAIOCB *dbs, int ret) static void dma_bdrv_cb(void *opaque, int ret) { DMAAIOCB *dbs = (DMAAIOCB *)opaque; - target_phys_addr_t cur_addr, cur_len; + dma_addr_t cur_addr, cur_len; void *mem; trace_dma_bdrv_cb(dbs, ret); @@ -139,8 +139,7 @@ static void dma_bdrv_cb(void *opaque, int ret) 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->dir != DMA_DIRECTION_TO_DEVICE); + mem = dma_memory_map(dbs->sg->dma, cur_addr, &cur_len, dbs->dir); if (!mem) break; qemu_iovec_add(&dbs->iov, mem, cur_len); @@ -225,7 +224,8 @@ BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs, } -static uint64_t dma_buf_rw(uint8_t *ptr, int32_t len, QEMUSGList *sg, bool to_dev) +static uint64_t dma_buf_rw(uint8_t *ptr, int32_t len, QEMUSGList *sg, + DMADirection dir) { uint64_t resid; int sg_cur_index; @@ -236,7 +236,7 @@ static uint64_t dma_buf_rw(uint8_t *ptr, int32_t len, QEMUSGList *sg, bool to_de while (len > 0) { ScatterGatherEntry entry = sg->sg[sg_cur_index++]; int32_t xfer = MIN(len, entry.len); - cpu_physical_memory_rw(entry.base, ptr, xfer, !to_dev); + dma_memory_rw(sg->dma, entry.base, ptr, xfer, dir); ptr += xfer; len -= xfer; resid -= xfer; @@ -247,12 +247,12 @@ static uint64_t dma_buf_rw(uint8_t *ptr, int32_t len, QEMUSGList *sg, bool to_de uint64_t dma_buf_read(uint8_t *ptr, int32_t len, QEMUSGList *sg) { - return dma_buf_rw(ptr, len, sg, 0); + 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, 1); + return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_TO_DEVICE); } void dma_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, diff --git a/dma.h b/dma.h index 8912dfc..e93076a 100644 --- a/dma.h +++ b/dma.h @@ -27,6 +27,7 @@ struct QEMUSGList { int nsg; int nalloc; size_t size; + DMAContext *dma; }; #if defined(TARGET_PHYS_ADDR_BITS) @@ -134,7 +135,7 @@ struct ScatterGatherEntry { dma_addr_t len; }; -void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint); +void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint, DMAContext *dma); void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len); void qemu_sglist_destroy(QEMUSGList *qsg); #endif diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c index e275e689..6c4226d 100644 --- a/hw/ide/ahci.c +++ b/hw/ide/ahci.c @@ -667,7 +667,8 @@ static int ahci_populate_sglist(AHCIDevice *ad, QEMUSGList *sglist) if (sglist_alloc_hint > 0) { AHCI_SG *tbl = (AHCI_SG *)prdt; - qemu_sglist_init(sglist, sglist_alloc_hint); + /* FIXME: pass the correct DMAContext */ + qemu_sglist_init(sglist, sglist_alloc_hint, NULL); for (i = 0; i < sglist_alloc_hint; i++) { /* flags_size is zero-based */ qemu_sglist_add(sglist, le64_to_cpu(tbl[i].addr), diff --git a/hw/ide/macio.c b/hw/ide/macio.c index 7b38d9e..848cb31 100644 --- a/hw/ide/macio.c +++ b/hw/ide/macio.c @@ -76,7 +76,7 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret) s->io_buffer_size = io->len; - qemu_sglist_init(&s->sg, io->len / MACIO_PAGE_SIZE + 1); + qemu_sglist_init(&s->sg, io->len / MACIO_PAGE_SIZE + 1, NULL); qemu_sglist_add(&s->sg, io->addr, io->len); io->addr += io->len; io->len = 0; @@ -133,7 +133,7 @@ static void pmac_ide_transfer_cb(void *opaque, int ret) s->io_buffer_index = 0; s->io_buffer_size = io->len; - qemu_sglist_init(&s->sg, io->len / MACIO_PAGE_SIZE + 1); + qemu_sglist_init(&s->sg, io->len / MACIO_PAGE_SIZE + 1, NULL); qemu_sglist_add(&s->sg, io->addr, io->len); io->addr += io->len; io->len = 0; diff --git a/hw/pci.h b/hw/pci.h index f148613..ee14a7f 100644 --- a/hw/pci.h +++ b/hw/pci.h @@ -625,7 +625,7 @@ static inline void pci_dma_unmap(PCIDevice *dev, void *buffer, dma_addr_t len, static inline void pci_dma_sglist_init(QEMUSGList *qsg, PCIDevice *dev, int alloc_hint) { - qemu_sglist_init(qsg, alloc_hint); + qemu_sglist_init(qsg, alloc_hint, pci_dma_context(dev)); } extern const VMStateDescription vmstate_pci_device; -- 2.7.4