[PATCH 0/8] hw: Have DMA API take MemTxAttrs arg & propagate MemTxResult (part 2)

[PATCH 0/8] hw: Have DMA API take MemTxAttrs arg & propagate MemTxResult (part 2)

[Philippe Mathieu-Daudé]

This is the continuation of part 1 (dma_memory API):
https://www.mail-archive.com/qemu-devel@nongnu.org/msg820359.html

This series update the dma_buf API.

Based on "hw: Let the DMA API take a MemTxAttrs argument"
Based-on: <20210702092439.989969-1-philmd@redhat.com>

Philippe Mathieu-Daudé (8):
  dma: Have dma_buf_rw() take a void pointer
  dma: Have dma_buf_read() / dma_buf_write() take a void pointer
  dma: Let pci_dma_rw() take MemTxAttrs argument
  dma: Let dma_buf_rw() take MemTxAttrs argument
  dma: Let dma_buf_write() take MemTxAttrs argument
  dma: Let dma_buf_read() take MemTxAttrs argument
  dma: Let dma_buf_rw() propagate MemTxResult
  dma: Let dma_buf_read() / dma_buf_write() propagate MemTxResult

 include/hw/pci/pci.h  | 10 +++++----
 include/sysemu/dma.h  |  6 ++++--
 hw/audio/intel-hda.c  |  3 ++-
 hw/ide/ahci.c         | 10 +++++----
 hw/nvme/ctrl.c        |  5 +++--
 hw/scsi/esp-pci.c     |  2 +-
 hw/scsi/megasas.c     | 48 ++++++++++++++++++++++++++++++-------------
 hw/scsi/scsi-bus.c    |  4 ++--
 softmmu/dma-helpers.c | 25 ++++++++++++++--------
 9 files changed, 74 insertions(+), 39 deletions(-)

-- 
2.33.1

[PATCH 1/8] dma: Have dma_buf_rw() take a void pointer

[Philippe Mathieu-Daudé]

DMA operations are run on any kind of buffer, not arrays of
uint8_t. Convert dma_buf_rw() to take a void pointer argument
to save us pointless casts to uint8_t *.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 softmmu/dma-helpers.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/softmmu/dma-helpers.c b/softmmu/dma-helpers.c
index 3c06a2feddd..09e29997ee5 100644
--- a/softmmu/dma-helpers.c
+++ b/softmmu/dma-helpers.c
@@ -294,9 +294,10 @@ BlockAIOCB *dma_blk_write(BlockBackend *blk,
 }
 
 
-static uint64_t dma_buf_rw(uint8_t *ptr, int32_t len, QEMUSGList *sg,
+static uint64_t dma_buf_rw(void *buf, int32_t len, QEMUSGList *sg,
                            DMADirection dir)
 {
+    uint8_t *ptr = buf;
     uint64_t resid;
     int sg_cur_index;
 
-- 
2.33.1

[PATCH 2/8] dma: Have dma_buf_read() / dma_buf_write() take a void pointer

[Philippe Mathieu-Daudé]

DMA operations are run on any kind of buffer, not arrays of
uint8_t. Convert dma_buf_read/dma_buf_write functions to take
a void pointer argument and save us pointless casts to uint8_t *.

Remove this pointless casts in the megasas device model.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 include/sysemu/dma.h  |  4 ++--
 hw/scsi/megasas.c     | 22 +++++++++++-----------
 softmmu/dma-helpers.c |  4 ++--
 3 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h
index 531f02db14e..2721bf296a8 100644
--- a/include/sysemu/dma.h
+++ b/include/sysemu/dma.h
@@ -303,8 +303,8 @@ BlockAIOCB *dma_blk_read(BlockBackend *blk,
 BlockAIOCB *dma_blk_write(BlockBackend *blk,
                           QEMUSGList *sg, uint64_t offset, uint32_t align,
                           BlockCompletionFunc *cb, void *opaque);
-uint64_t dma_buf_read(uint8_t *ptr, int32_t len, QEMUSGList *sg);
-uint64_t dma_buf_write(uint8_t *ptr, int32_t len, QEMUSGList *sg);
+uint64_t dma_buf_read(void *ptr, int32_t len, QEMUSGList *sg);
+uint64_t dma_buf_write(void *ptr, int32_t len, QEMUSGList *sg);
 
 void dma_acct_start(BlockBackend *blk, BlockAcctCookie *cookie,
                     QEMUSGList *sg, enum BlockAcctType type);
diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index 4ff51221d4c..733ca8e9865 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -847,7 +847,7 @@ static int megasas_ctrl_get_info(MegasasState *s, MegasasCmd *cmd)
                                        MFI_INFO_PDMIX_SATA |
                                        MFI_INFO_PDMIX_LD);
 
-    cmd->iov_size -= dma_buf_read((uint8_t *)&info, dcmd_size, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg);
     return MFI_STAT_OK;
 }
 
@@ -877,7 +877,7 @@ static int megasas_mfc_get_defaults(MegasasState *s, MegasasCmd *cmd)
     info.disable_preboot_cli = 1;
     info.cluster_disable = 1;
 
-    cmd->iov_size -= dma_buf_read((uint8_t *)&info, dcmd_size, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg);
     return MFI_STAT_OK;
 }
 
@@ -898,7 +898,7 @@ static int megasas_dcmd_get_bios_info(MegasasState *s, MegasasCmd *cmd)
         info.expose_all_drives = 1;
     }
 
-    cmd->iov_size -= dma_buf_read((uint8_t *)&info, dcmd_size, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg);
     return MFI_STAT_OK;
 }
 
@@ -909,7 +909,7 @@ static int megasas_dcmd_get_fw_time(MegasasState *s, MegasasCmd *cmd)
 
     fw_time = cpu_to_le64(megasas_fw_time());
 
-    cmd->iov_size -= dma_buf_read((uint8_t *)&fw_time, dcmd_size, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(&fw_time, dcmd_size, &cmd->qsg);
     return MFI_STAT_OK;
 }
 
@@ -936,7 +936,7 @@ static int megasas_event_info(MegasasState *s, MegasasCmd *cmd)
     info.shutdown_seq_num = cpu_to_le32(s->shutdown_event);
     info.boot_seq_num = cpu_to_le32(s->boot_event);
 
-    cmd->iov_size -= dma_buf_read((uint8_t *)&info, dcmd_size, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg);
     return MFI_STAT_OK;
 }
 
@@ -1005,7 +1005,7 @@ static int megasas_dcmd_pd_get_list(MegasasState *s, MegasasCmd *cmd)
     info.size = cpu_to_le32(offset);
     info.count = cpu_to_le32(num_pd_disks);
 
-    cmd->iov_size -= dma_buf_read((uint8_t *)&info, offset, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(&info, offset, &cmd->qsg);
     return MFI_STAT_OK;
 }
 
@@ -1171,7 +1171,7 @@ static int megasas_dcmd_ld_get_list(MegasasState *s, MegasasCmd *cmd)
     info.ld_count = cpu_to_le32(num_ld_disks);
     trace_megasas_dcmd_ld_get_list(cmd->index, num_ld_disks, max_ld_disks);
 
-    resid = dma_buf_read((uint8_t *)&info, dcmd_size, &cmd->qsg);
+    resid = dma_buf_read(&info, dcmd_size, &cmd->qsg);
     cmd->iov_size = dcmd_size - resid;
     return MFI_STAT_OK;
 }
@@ -1220,7 +1220,7 @@ static int megasas_dcmd_ld_list_query(MegasasState *s, MegasasCmd *cmd)
     info.size = dcmd_size;
     trace_megasas_dcmd_ld_get_list(cmd->index, num_ld_disks, max_ld_disks);
 
-    resid = dma_buf_read((uint8_t *)&info, dcmd_size, &cmd->qsg);
+    resid = dma_buf_read(&info, dcmd_size, &cmd->qsg);
     cmd->iov_size = dcmd_size - resid;
     return MFI_STAT_OK;
 }
@@ -1389,7 +1389,7 @@ static int megasas_dcmd_cfg_read(MegasasState *s, MegasasCmd *cmd)
         ld_offset += sizeof(struct mfi_ld_config);
     }
 
-    cmd->iov_size -= dma_buf_read((uint8_t *)data, info->size, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(data, info->size, &cmd->qsg);
     return MFI_STAT_OK;
 }
 
@@ -1419,7 +1419,7 @@ static int megasas_dcmd_get_properties(MegasasState *s, MegasasCmd *cmd)
     info.ecc_bucket_leak_rate = cpu_to_le16(1440);
     info.expose_encl_devices = 1;
 
-    cmd->iov_size -= dma_buf_read((uint8_t *)&info, dcmd_size, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg);
     return MFI_STAT_OK;
 }
 
@@ -1464,7 +1464,7 @@ static int megasas_dcmd_set_properties(MegasasState *s, MegasasCmd *cmd)
                                             dcmd_size);
         return MFI_STAT_INVALID_PARAMETER;
     }
-    dma_buf_write((uint8_t *)&info, dcmd_size, &cmd->qsg);
+    dma_buf_write(&info, dcmd_size, &cmd->qsg);
     trace_megasas_dcmd_unsupported(cmd->index, cmd->iov_size);
     return MFI_STAT_OK;
 }
diff --git a/softmmu/dma-helpers.c b/softmmu/dma-helpers.c
index 09e29997ee5..7f37548394e 100644
--- a/softmmu/dma-helpers.c
+++ b/softmmu/dma-helpers.c
@@ -317,12 +317,12 @@ static uint64_t dma_buf_rw(void *buf, int32_t len, QEMUSGList *sg,
     return resid;
 }
 
-uint64_t dma_buf_read(uint8_t *ptr, int32_t len, QEMUSGList *sg)
+uint64_t dma_buf_read(void *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)
+uint64_t dma_buf_write(void *ptr, int32_t len, QEMUSGList *sg)
 {
     return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_TO_DEVICE);
 }
-- 
2.33.1

[PATCH 3/8] dma: Let pci_dma_rw() take MemTxAttrs argument

[Philippe Mathieu-Daudé]

Let devices specify transaction attributes when calling pci_dma_rw().

Keep the default MEMTXATTRS_UNSPECIFIED in the few callers.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 include/hw/pci/pci.h | 10 ++++++----
 hw/audio/intel-hda.c |  3 ++-
 hw/scsi/esp-pci.c    |  2 +-
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index 1acefc2a4c3..a751ab5a75d 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -806,10 +806,10 @@ static inline AddressSpace *pci_get_address_space(PCIDevice *dev)
  */
 static inline MemTxResult pci_dma_rw(PCIDevice *dev, dma_addr_t addr,
                                      void *buf, dma_addr_t len,
-                                     DMADirection dir)
+                                     DMADirection dir, MemTxAttrs attrs)
 {
     return dma_memory_rw(pci_get_address_space(dev), addr, buf, len,
-                         dir, MEMTXATTRS_UNSPECIFIED);
+                         dir, attrs);
 }
 
 /**
@@ -827,7 +827,8 @@ static inline MemTxResult pci_dma_rw(PCIDevice *dev, dma_addr_t addr,
 static inline MemTxResult pci_dma_read(PCIDevice *dev, dma_addr_t addr,
                                        void *buf, dma_addr_t len)
 {
-    return pci_dma_rw(dev, addr, buf, len, DMA_DIRECTION_TO_DEVICE);
+    return pci_dma_rw(dev, addr, buf, len,
+                      DMA_DIRECTION_TO_DEVICE, MEMTXATTRS_UNSPECIFIED);
 }
 
 /**
@@ -845,7 +846,8 @@ static inline MemTxResult pci_dma_read(PCIDevice *dev, dma_addr_t addr,
 static inline MemTxResult pci_dma_write(PCIDevice *dev, dma_addr_t addr,
                                         const void *buf, dma_addr_t len)
 {
-    return pci_dma_rw(dev, addr, (void *) buf, len, DMA_DIRECTION_FROM_DEVICE);
+    return pci_dma_rw(dev, addr, (void *) buf, len,
+                      DMA_DIRECTION_FROM_DEVICE, MEMTXATTRS_UNSPECIFIED);
 }
 
 #define PCI_DMA_DEFINE_LDST(_l, _s, _bits)                              \
diff --git a/hw/audio/intel-hda.c b/hw/audio/intel-hda.c
index 8ce9df64e3e..fb3d34a4a0c 100644
--- a/hw/audio/intel-hda.c
+++ b/hw/audio/intel-hda.c
@@ -427,7 +427,8 @@ static bool intel_hda_xfer(HDACodecDevice *dev, uint32_t stnr, bool output,
         dprint(d, 3, "dma: entry %d, pos %d/%d, copy %d\n",
                st->be, st->bp, st->bpl[st->be].len, copy);
 
-        pci_dma_rw(&d->pci, st->bpl[st->be].addr + st->bp, buf, copy, !output);
+        pci_dma_rw(&d->pci, st->bpl[st->be].addr + st->bp, buf, copy, !output,
+                   MEMTXATTRS_UNSPECIFIED);
         st->lpib += copy;
         st->bp += copy;
         buf += copy;
diff --git a/hw/scsi/esp-pci.c b/hw/scsi/esp-pci.c
index dac054aeed4..1792f84cea6 100644
--- a/hw/scsi/esp-pci.c
+++ b/hw/scsi/esp-pci.c
@@ -280,7 +280,7 @@ static void esp_pci_dma_memory_rw(PCIESPState *pci, uint8_t *buf, int len,
         len = pci->dma_regs[DMA_WBC];
     }
 
-    pci_dma_rw(PCI_DEVICE(pci), addr, buf, len, dir);
+    pci_dma_rw(PCI_DEVICE(pci), addr, buf, len, dir, MEMTXATTRS_UNSPECIFIED);
 
     /* update status registers */
     pci->dma_regs[DMA_WBC] -= len;
-- 
2.33.1

[PATCH 4/8] dma: Let dma_buf_rw() take MemTxAttrs argument

[Philippe Mathieu-Daudé]

Let devices specify transaction attributes when calling dma_buf_rw().

Keep the default MEMTXATTRS_UNSPECIFIED in the 2 callers.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 softmmu/dma-helpers.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/softmmu/dma-helpers.c b/softmmu/dma-helpers.c
index 7f37548394e..fa81d2b386c 100644
--- a/softmmu/dma-helpers.c
+++ b/softmmu/dma-helpers.c
@@ -295,7 +295,7 @@ BlockAIOCB *dma_blk_write(BlockBackend *blk,
 
 
 static uint64_t dma_buf_rw(void *buf, int32_t len, QEMUSGList *sg,
-                           DMADirection dir)
+                           DMADirection dir, MemTxAttrs attrs)
 {
     uint8_t *ptr = buf;
     uint64_t resid;
@@ -307,8 +307,7 @@ static uint64_t dma_buf_rw(void *buf, int32_t len, QEMUSGList *sg,
     while (len > 0) {
         ScatterGatherEntry entry = sg->sg[sg_cur_index++];
         int32_t xfer = MIN(len, entry.len);
-        dma_memory_rw(sg->as, entry.base, ptr, xfer, dir,
-                      MEMTXATTRS_UNSPECIFIED);
+        dma_memory_rw(sg->as, entry.base, ptr, xfer, dir, attrs);
         ptr += xfer;
         len -= xfer;
         resid -= xfer;
@@ -319,12 +318,14 @@ static uint64_t dma_buf_rw(void *buf, int32_t len, QEMUSGList *sg,
 
 uint64_t dma_buf_read(void *ptr, int32_t len, QEMUSGList *sg)
 {
-    return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_FROM_DEVICE);
+    return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_FROM_DEVICE,
+                      MEMTXATTRS_UNSPECIFIED);
 }
 
 uint64_t dma_buf_write(void *ptr, int32_t len, QEMUSGList *sg)
 {
-    return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_TO_DEVICE);
+    return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_TO_DEVICE,
+                      MEMTXATTRS_UNSPECIFIED);
 }
 
 void dma_acct_start(BlockBackend *blk, BlockAcctCookie *cookie,
-- 
2.33.1

[PATCH 5/8] dma: Let dma_buf_write() take MemTxAttrs argument

[Philippe Mathieu-Daudé]

Let devices specify transaction attributes when calling
dma_buf_write().

Keep the default MEMTXATTRS_UNSPECIFIED in the few callers.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 include/sysemu/dma.h  | 2 +-
 hw/ide/ahci.c         | 6 ++++--
 hw/nvme/ctrl.c        | 3 ++-
 hw/scsi/megasas.c     | 2 +-
 hw/scsi/scsi-bus.c    | 2 +-
 softmmu/dma-helpers.c | 5 ++---
 6 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h
index 2721bf296a8..c5f45f6c594 100644
--- a/include/sysemu/dma.h
+++ b/include/sysemu/dma.h
@@ -304,7 +304,7 @@ BlockAIOCB *dma_blk_write(BlockBackend *blk,
                           QEMUSGList *sg, uint64_t offset, uint32_t align,
                           BlockCompletionFunc *cb, void *opaque);
 uint64_t dma_buf_read(void *ptr, int32_t len, QEMUSGList *sg);
-uint64_t dma_buf_write(void *ptr, int32_t len, QEMUSGList *sg);
+uint64_t dma_buf_write(void *ptr, int32_t len, QEMUSGList *sg, MemTxAttrs attrs);
 
 void dma_acct_start(BlockBackend *blk, BlockAcctCookie *cookie,
                     QEMUSGList *sg, enum BlockAcctType type);
diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index 8e77ddb660f..079d2977f23 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -1381,8 +1381,10 @@ static void ahci_pio_transfer(const IDEDMA *dma)
                             has_sglist ? "" : "o");
 
     if (has_sglist && size) {
+        const MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED;
+
         if (is_write) {
-            dma_buf_write(s->data_ptr, size, &s->sg);
+            dma_buf_write(s->data_ptr, size, &s->sg, attrs);
         } else {
             dma_buf_read(s->data_ptr, size, &s->sg);
         }
@@ -1479,7 +1481,7 @@ static int ahci_dma_rw_buf(const IDEDMA *dma, bool is_write)
     if (is_write) {
         dma_buf_read(p, l, &s->sg);
     } else {
-        dma_buf_write(p, l, &s->sg);
+        dma_buf_write(p, l, &s->sg, MEMTXATTRS_UNSPECIFIED);
     }
 
     /* free sglist, update byte count */
diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index 5f573c417b3..e1a531d5d6c 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -1146,10 +1146,11 @@ static uint16_t nvme_tx(NvmeCtrl *n, NvmeSg *sg, uint8_t *ptr, uint32_t len,
     assert(sg->flags & NVME_SG_ALLOC);
 
     if (sg->flags & NVME_SG_DMA) {
+        const MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED;
         uint64_t residual;
 
         if (dir == NVME_TX_DIRECTION_TO_DEVICE) {
-            residual = dma_buf_write(ptr, len, &sg->qsg);
+            residual = dma_buf_write(ptr, len, &sg->qsg, attrs);
         } else {
             residual = dma_buf_read(ptr, len, &sg->qsg);
         }
diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index 733ca8e9865..4ec104b7820 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -1464,7 +1464,7 @@ static int megasas_dcmd_set_properties(MegasasState *s, MegasasCmd *cmd)
                                             dcmd_size);
         return MFI_STAT_INVALID_PARAMETER;
     }
-    dma_buf_write(&info, dcmd_size, &cmd->qsg);
+    dma_buf_write(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     trace_megasas_dcmd_unsupported(cmd->index, cmd->iov_size);
     return MFI_STAT_OK;
 }
diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
index 77325d8cc7a..64a506a3975 100644
--- a/hw/scsi/scsi-bus.c
+++ b/hw/scsi/scsi-bus.c
@@ -1423,7 +1423,7 @@ void scsi_req_data(SCSIRequest *req, int len)
     if (req->cmd.mode == SCSI_XFER_FROM_DEV) {
         req->resid = dma_buf_read(buf, len, req->sg);
     } else {
-        req->resid = dma_buf_write(buf, len, req->sg);
+        req->resid = dma_buf_write(buf, len, req->sg, MEMTXATTRS_UNSPECIFIED);
     }
     scsi_req_continue(req);
 }
diff --git a/softmmu/dma-helpers.c b/softmmu/dma-helpers.c
index fa81d2b386c..2f1a241b81a 100644
--- a/softmmu/dma-helpers.c
+++ b/softmmu/dma-helpers.c
@@ -322,10 +322,9 @@ uint64_t dma_buf_read(void *ptr, int32_t len, QEMUSGList *sg)
                       MEMTXATTRS_UNSPECIFIED);
 }
 
-uint64_t dma_buf_write(void *ptr, int32_t len, QEMUSGList *sg)
+uint64_t dma_buf_write(void *ptr, int32_t len, QEMUSGList *sg, MemTxAttrs attrs)
 {
-    return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_TO_DEVICE,
-                      MEMTXATTRS_UNSPECIFIED);
+    return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_TO_DEVICE, attrs);
 }
 
 void dma_acct_start(BlockBackend *blk, BlockAcctCookie *cookie,
-- 
2.33.1

[PATCH 6/8] dma: Let dma_buf_read() take MemTxAttrs argument

[Philippe Mathieu-Daudé]

Let devices specify transaction attributes when calling
dma_buf_read().

Keep the default MEMTXATTRS_UNSPECIFIED in the few callers.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 include/sysemu/dma.h  |  2 +-
 hw/ide/ahci.c         |  4 ++--
 hw/nvme/ctrl.c        |  2 +-
 hw/scsi/megasas.c     | 24 ++++++++++++------------
 hw/scsi/scsi-bus.c    |  2 +-
 softmmu/dma-helpers.c |  5 ++---
 6 files changed, 19 insertions(+), 20 deletions(-)

diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h
index c5f45f6c594..cdf379fecad 100644
--- a/include/sysemu/dma.h
+++ b/include/sysemu/dma.h
@@ -303,7 +303,7 @@ BlockAIOCB *dma_blk_read(BlockBackend *blk,
 BlockAIOCB *dma_blk_write(BlockBackend *blk,
                           QEMUSGList *sg, uint64_t offset, uint32_t align,
                           BlockCompletionFunc *cb, void *opaque);
-uint64_t dma_buf_read(void *ptr, int32_t len, QEMUSGList *sg);
+uint64_t dma_buf_read(void *ptr, int32_t len, QEMUSGList *sg, MemTxAttrs attrs);
 uint64_t dma_buf_write(void *ptr, int32_t len, QEMUSGList *sg, MemTxAttrs attrs);
 
 void dma_acct_start(BlockBackend *blk, BlockAcctCookie *cookie,
diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index 079d2977f23..205dfdc6622 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -1386,7 +1386,7 @@ static void ahci_pio_transfer(const IDEDMA *dma)
         if (is_write) {
             dma_buf_write(s->data_ptr, size, &s->sg, attrs);
         } else {
-            dma_buf_read(s->data_ptr, size, &s->sg);
+            dma_buf_read(s->data_ptr, size, &s->sg, attrs);
         }
     }
 
@@ -1479,7 +1479,7 @@ static int ahci_dma_rw_buf(const IDEDMA *dma, bool is_write)
     }
 
     if (is_write) {
-        dma_buf_read(p, l, &s->sg);
+        dma_buf_read(p, l, &s->sg, MEMTXATTRS_UNSPECIFIED);
     } else {
         dma_buf_write(p, l, &s->sg, MEMTXATTRS_UNSPECIFIED);
     }
diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index e1a531d5d6c..462f79a1f60 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -1152,7 +1152,7 @@ static uint16_t nvme_tx(NvmeCtrl *n, NvmeSg *sg, uint8_t *ptr, uint32_t len,
         if (dir == NVME_TX_DIRECTION_TO_DEVICE) {
             residual = dma_buf_write(ptr, len, &sg->qsg, attrs);
         } else {
-            residual = dma_buf_read(ptr, len, &sg->qsg);
+            residual = dma_buf_read(ptr, len, &sg->qsg, attrs);
         }
 
         if (unlikely(residual)) {
diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index 4ec104b7820..dfd48f1a873 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -847,7 +847,7 @@ static int megasas_ctrl_get_info(MegasasState *s, MegasasCmd *cmd)
                                        MFI_INFO_PDMIX_SATA |
                                        MFI_INFO_PDMIX_LD);
 
-    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     return MFI_STAT_OK;
 }
 
@@ -877,7 +877,7 @@ static int megasas_mfc_get_defaults(MegasasState *s, MegasasCmd *cmd)
     info.disable_preboot_cli = 1;
     info.cluster_disable = 1;
 
-    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     return MFI_STAT_OK;
 }
 
@@ -898,7 +898,7 @@ static int megasas_dcmd_get_bios_info(MegasasState *s, MegasasCmd *cmd)
         info.expose_all_drives = 1;
     }
 
-    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     return MFI_STAT_OK;
 }
 
@@ -909,7 +909,7 @@ static int megasas_dcmd_get_fw_time(MegasasState *s, MegasasCmd *cmd)
 
     fw_time = cpu_to_le64(megasas_fw_time());
 
-    cmd->iov_size -= dma_buf_read(&fw_time, dcmd_size, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(&fw_time, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     return MFI_STAT_OK;
 }
 
@@ -936,7 +936,7 @@ static int megasas_event_info(MegasasState *s, MegasasCmd *cmd)
     info.shutdown_seq_num = cpu_to_le32(s->shutdown_event);
     info.boot_seq_num = cpu_to_le32(s->boot_event);
 
-    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     return MFI_STAT_OK;
 }
 
@@ -1005,7 +1005,7 @@ static int megasas_dcmd_pd_get_list(MegasasState *s, MegasasCmd *cmd)
     info.size = cpu_to_le32(offset);
     info.count = cpu_to_le32(num_pd_disks);
 
-    cmd->iov_size -= dma_buf_read(&info, offset, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(&info, offset, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     return MFI_STAT_OK;
 }
 
@@ -1099,7 +1099,7 @@ static int megasas_pd_get_info_submit(SCSIDevice *sdev, int lun,
     info->connected_port_bitmap = 0x1;
     info->device_speed = 1;
     info->link_speed = 1;
-    resid = dma_buf_read(cmd->iov_buf, dcmd_size, &cmd->qsg);
+    resid = dma_buf_read(cmd->iov_buf, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     g_free(cmd->iov_buf);
     cmd->iov_size = dcmd_size - resid;
     cmd->iov_buf = NULL;
@@ -1171,7 +1171,7 @@ static int megasas_dcmd_ld_get_list(MegasasState *s, MegasasCmd *cmd)
     info.ld_count = cpu_to_le32(num_ld_disks);
     trace_megasas_dcmd_ld_get_list(cmd->index, num_ld_disks, max_ld_disks);
 
-    resid = dma_buf_read(&info, dcmd_size, &cmd->qsg);
+    resid = dma_buf_read(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     cmd->iov_size = dcmd_size - resid;
     return MFI_STAT_OK;
 }
@@ -1220,7 +1220,7 @@ static int megasas_dcmd_ld_list_query(MegasasState *s, MegasasCmd *cmd)
     info.size = dcmd_size;
     trace_megasas_dcmd_ld_get_list(cmd->index, num_ld_disks, max_ld_disks);
 
-    resid = dma_buf_read(&info, dcmd_size, &cmd->qsg);
+    resid = dma_buf_read(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     cmd->iov_size = dcmd_size - resid;
     return MFI_STAT_OK;
 }
@@ -1270,7 +1270,7 @@ static int megasas_ld_get_info_submit(SCSIDevice *sdev, int lun,
     info->ld_config.span[0].num_blocks = info->size;
     info->ld_config.span[0].array_ref = cpu_to_le16(sdev_id);
 
-    resid = dma_buf_read(cmd->iov_buf, dcmd_size, &cmd->qsg);
+    resid = dma_buf_read(cmd->iov_buf, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     g_free(cmd->iov_buf);
     cmd->iov_size = dcmd_size - resid;
     cmd->iov_buf = NULL;
@@ -1389,7 +1389,7 @@ static int megasas_dcmd_cfg_read(MegasasState *s, MegasasCmd *cmd)
         ld_offset += sizeof(struct mfi_ld_config);
     }
 
-    cmd->iov_size -= dma_buf_read(data, info->size, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(data, info->size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     return MFI_STAT_OK;
 }
 
@@ -1419,7 +1419,7 @@ static int megasas_dcmd_get_properties(MegasasState *s, MegasasCmd *cmd)
     info.ecc_bucket_leak_rate = cpu_to_le16(1440);
     info.expose_encl_devices = 1;
 
-    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg);
+    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     return MFI_STAT_OK;
 }
 
diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
index 64a506a3975..2b5e9dca311 100644
--- a/hw/scsi/scsi-bus.c
+++ b/hw/scsi/scsi-bus.c
@@ -1421,7 +1421,7 @@ void scsi_req_data(SCSIRequest *req, int len)
 
     buf = scsi_req_get_buf(req);
     if (req->cmd.mode == SCSI_XFER_FROM_DEV) {
-        req->resid = dma_buf_read(buf, len, req->sg);
+        req->resid = dma_buf_read(buf, len, req->sg, MEMTXATTRS_UNSPECIFIED);
     } else {
         req->resid = dma_buf_write(buf, len, req->sg, MEMTXATTRS_UNSPECIFIED);
     }
diff --git a/softmmu/dma-helpers.c b/softmmu/dma-helpers.c
index 2f1a241b81a..a391773c296 100644
--- a/softmmu/dma-helpers.c
+++ b/softmmu/dma-helpers.c
@@ -316,10 +316,9 @@ static uint64_t dma_buf_rw(void *buf, int32_t len, QEMUSGList *sg,
     return resid;
 }
 
-uint64_t dma_buf_read(void *ptr, int32_t len, QEMUSGList *sg)
+uint64_t dma_buf_read(void *ptr, int32_t len, QEMUSGList *sg, MemTxAttrs attrs)
 {
-    return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_FROM_DEVICE,
-                      MEMTXATTRS_UNSPECIFIED);
+    return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_FROM_DEVICE, attrs);
 }
 
 uint64_t dma_buf_write(void *ptr, int32_t len, QEMUSGList *sg, MemTxAttrs attrs)
-- 
2.33.1

[PATCH 7/8] dma: Let dma_buf_rw() propagate MemTxResult

[Philippe Mathieu-Daudé]

dma_memory_rw() returns a MemTxResult type. Do not discard
it, return it to the caller.

Since dma_buf_rw() was previously returning the QEMUSGList
size not consumed, add an extra argument where this size
can be stored.

Update the 2 callers.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 softmmu/dma-helpers.c | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/softmmu/dma-helpers.c b/softmmu/dma-helpers.c
index a391773c296..b0be1564797 100644
--- a/softmmu/dma-helpers.c
+++ b/softmmu/dma-helpers.c
@@ -294,12 +294,14 @@ BlockAIOCB *dma_blk_write(BlockBackend *blk,
 }
 
 
-static uint64_t dma_buf_rw(void *buf, int32_t len, QEMUSGList *sg,
-                           DMADirection dir, MemTxAttrs attrs)
+static MemTxResult dma_buf_rw(void *buf, int32_t len, uint64_t *residp,
+                              QEMUSGList *sg, DMADirection dir,
+                              MemTxAttrs attrs)
 {
     uint8_t *ptr = buf;
     uint64_t resid;
     int sg_cur_index;
+    MemTxResult res = MEMTX_OK;
 
     resid = sg->size;
     sg_cur_index = 0;
@@ -307,23 +309,34 @@ static uint64_t dma_buf_rw(void *buf, int32_t len, QEMUSGList *sg,
     while (len > 0) {
         ScatterGatherEntry entry = sg->sg[sg_cur_index++];
         int32_t xfer = MIN(len, entry.len);
-        dma_memory_rw(sg->as, entry.base, ptr, xfer, dir, attrs);
+        res |= dma_memory_rw(sg->as, entry.base, ptr, xfer, dir, attrs);
         ptr += xfer;
         len -= xfer;
         resid -= xfer;
     }
 
-    return resid;
+    if (residp) {
+        *residp = resid;
+    }
+    return res;
 }
 
 uint64_t dma_buf_read(void *ptr, int32_t len, QEMUSGList *sg, MemTxAttrs attrs)
 {
-    return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_FROM_DEVICE, attrs);
+    uint64_t resid;
+
+    dma_buf_rw(ptr, len, &resid, sg, DMA_DIRECTION_FROM_DEVICE, attrs);
+
+    return resid;
 }
 
 uint64_t dma_buf_write(void *ptr, int32_t len, QEMUSGList *sg, MemTxAttrs attrs)
 {
-    return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_TO_DEVICE, attrs);
+    uint64_t resid;
+
+    dma_buf_rw(ptr, len, &resid, sg, DMA_DIRECTION_TO_DEVICE, attrs);
+
+    return resid;
 }
 
 void dma_acct_start(BlockBackend *blk, BlockAcctCookie *cookie,
-- 
2.33.1

[PATCH 8/8] dma: Let dma_buf_read() / dma_buf_write() propagate MemTxResult

[Philippe Mathieu-Daudé]

Since the previous commit, dma_buf_rw() returns a MemTxResult
type. Do not discard it, return it to the caller.

Since both dma_buf_read/dma_buf_write functions were previously
returning the QEMUSGList size not consumed, add an extra argument
where the unconsummed size can be stored.

Update the few callers.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 include/sysemu/dma.h  |  6 ++++--
 hw/ide/ahci.c         |  8 ++++----
 hw/nvme/ctrl.c        |  4 ++--
 hw/scsi/megasas.c     | 48 ++++++++++++++++++++++++++++++-------------
 hw/scsi/scsi-bus.c    |  4 ++--
 softmmu/dma-helpers.c | 18 ++++++----------
 6 files changed, 52 insertions(+), 36 deletions(-)

diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h
index cdf379fecad..9f998edbea4 100644
--- a/include/sysemu/dma.h
+++ b/include/sysemu/dma.h
@@ -303,8 +303,10 @@ BlockAIOCB *dma_blk_read(BlockBackend *blk,
 BlockAIOCB *dma_blk_write(BlockBackend *blk,
                           QEMUSGList *sg, uint64_t offset, uint32_t align,
                           BlockCompletionFunc *cb, void *opaque);
-uint64_t dma_buf_read(void *ptr, int32_t len, QEMUSGList *sg, MemTxAttrs attrs);
-uint64_t dma_buf_write(void *ptr, int32_t len, QEMUSGList *sg, MemTxAttrs attrs);
+MemTxResult dma_buf_read(void *ptr, int32_t len, uint64_t *residp,
+                         QEMUSGList *sg, MemTxAttrs attrs);
+MemTxResult dma_buf_write(void *ptr, int32_t len, uint64_t *residp,
+                          QEMUSGList *sg, MemTxAttrs attrs);
 
 void dma_acct_start(BlockBackend *blk, BlockAcctCookie *cookie,
                     QEMUSGList *sg, enum BlockAcctType type);
diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index 205dfdc6622..0c7d31ceada 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -1384,9 +1384,9 @@ static void ahci_pio_transfer(const IDEDMA *dma)
         const MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED;
 
         if (is_write) {
-            dma_buf_write(s->data_ptr, size, &s->sg, attrs);
+            dma_buf_write(s->data_ptr, size, NULL, &s->sg, attrs);
         } else {
-            dma_buf_read(s->data_ptr, size, &s->sg, attrs);
+            dma_buf_read(s->data_ptr, size, NULL, &s->sg, attrs);
         }
     }
 
@@ -1479,9 +1479,9 @@ static int ahci_dma_rw_buf(const IDEDMA *dma, bool is_write)
     }
 
     if (is_write) {
-        dma_buf_read(p, l, &s->sg, MEMTXATTRS_UNSPECIFIED);
+        dma_buf_read(p, l, NULL, &s->sg, MEMTXATTRS_UNSPECIFIED);
     } else {
-        dma_buf_write(p, l, &s->sg, MEMTXATTRS_UNSPECIFIED);
+        dma_buf_write(p, l, NULL, &s->sg, MEMTXATTRS_UNSPECIFIED);
     }
 
     /* free sglist, update byte count */
diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index 462f79a1f60..fa410a179a6 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -1150,9 +1150,9 @@ static uint16_t nvme_tx(NvmeCtrl *n, NvmeSg *sg, uint8_t *ptr, uint32_t len,
         uint64_t residual;
 
         if (dir == NVME_TX_DIRECTION_TO_DEVICE) {
-            residual = dma_buf_write(ptr, len, &sg->qsg, attrs);
+            dma_buf_write(ptr, len, &residual, &sg->qsg, attrs);
         } else {
-            residual = dma_buf_read(ptr, len, &sg->qsg, attrs);
+            dma_buf_read(ptr, len, &residual, &sg->qsg, attrs);
         }
 
         if (unlikely(residual)) {
diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index dfd48f1a873..619b66ef0f3 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -737,6 +737,7 @@ static int megasas_ctrl_get_info(MegasasState *s, MegasasCmd *cmd)
     size_t dcmd_size = sizeof(info);
     BusChild *kid;
     int num_pd_disks = 0;
+    uint64_t resid;
 
     memset(&info, 0x0, dcmd_size);
     if (cmd->iov_size < dcmd_size) {
@@ -847,7 +848,8 @@ static int megasas_ctrl_get_info(MegasasState *s, MegasasCmd *cmd)
                                        MFI_INFO_PDMIX_SATA |
                                        MFI_INFO_PDMIX_LD);
 
-    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    dma_buf_read(&info, dcmd_size, &resid, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    cmd->iov_size -= resid;
     return MFI_STAT_OK;
 }
 
@@ -855,6 +857,7 @@ static int megasas_mfc_get_defaults(MegasasState *s, MegasasCmd *cmd)
 {
     struct mfi_defaults info;
     size_t dcmd_size = sizeof(struct mfi_defaults);
+    uint64_t resid;
 
     memset(&info, 0x0, dcmd_size);
     if (cmd->iov_size < dcmd_size) {
@@ -877,7 +880,8 @@ static int megasas_mfc_get_defaults(MegasasState *s, MegasasCmd *cmd)
     info.disable_preboot_cli = 1;
     info.cluster_disable = 1;
 
-    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    dma_buf_read(&info, dcmd_size, &resid, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    cmd->iov_size -= resid;
     return MFI_STAT_OK;
 }
 
@@ -885,6 +889,7 @@ static int megasas_dcmd_get_bios_info(MegasasState *s, MegasasCmd *cmd)
 {
     struct mfi_bios_data info;
     size_t dcmd_size = sizeof(info);
+    uint64_t resid;
 
     memset(&info, 0x0, dcmd_size);
     if (cmd->iov_size < dcmd_size) {
@@ -898,7 +903,8 @@ static int megasas_dcmd_get_bios_info(MegasasState *s, MegasasCmd *cmd)
         info.expose_all_drives = 1;
     }
 
-    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    dma_buf_read(&info, dcmd_size, &resid, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    cmd->iov_size -= resid;
     return MFI_STAT_OK;
 }
 
@@ -906,10 +912,12 @@ static int megasas_dcmd_get_fw_time(MegasasState *s, MegasasCmd *cmd)
 {
     uint64_t fw_time;
     size_t dcmd_size = sizeof(fw_time);
+    uint64_t resid;
 
     fw_time = cpu_to_le64(megasas_fw_time());
 
-    cmd->iov_size -= dma_buf_read(&fw_time, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    dma_buf_read(&fw_time, dcmd_size, &resid, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    cmd->iov_size -= resid;
     return MFI_STAT_OK;
 }
 
@@ -929,6 +937,7 @@ static int megasas_event_info(MegasasState *s, MegasasCmd *cmd)
 {
     struct mfi_evt_log_state info;
     size_t dcmd_size = sizeof(info);
+    uint64_t resid;
 
     memset(&info, 0, dcmd_size);
 
@@ -936,7 +945,8 @@ static int megasas_event_info(MegasasState *s, MegasasCmd *cmd)
     info.shutdown_seq_num = cpu_to_le32(s->shutdown_event);
     info.boot_seq_num = cpu_to_le32(s->boot_event);
 
-    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    dma_buf_read(&info, dcmd_size, &resid, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    cmd->iov_size -= resid;
     return MFI_STAT_OK;
 }
 
@@ -966,6 +976,7 @@ static int megasas_dcmd_pd_get_list(MegasasState *s, MegasasCmd *cmd)
     size_t dcmd_size = sizeof(info);
     BusChild *kid;
     uint32_t offset, dcmd_limit, num_pd_disks = 0, max_pd_disks;
+    uint64_t resid;
 
     memset(&info, 0, dcmd_size);
     offset = 8;
@@ -1005,7 +1016,8 @@ static int megasas_dcmd_pd_get_list(MegasasState *s, MegasasCmd *cmd)
     info.size = cpu_to_le32(offset);
     info.count = cpu_to_le32(num_pd_disks);
 
-    cmd->iov_size -= dma_buf_read(&info, offset, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    dma_buf_read(&info, offset, &resid, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    cmd->iov_size -= resid;
     return MFI_STAT_OK;
 }
 
@@ -1099,7 +1111,9 @@ static int megasas_pd_get_info_submit(SCSIDevice *sdev, int lun,
     info->connected_port_bitmap = 0x1;
     info->device_speed = 1;
     info->link_speed = 1;
-    resid = dma_buf_read(cmd->iov_buf, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    dma_buf_read(cmd->iov_buf, dcmd_size, &resid, &cmd->qsg,
+                 MEMTXATTRS_UNSPECIFIED);
+    cmd->iov_size -= resid;
     g_free(cmd->iov_buf);
     cmd->iov_size = dcmd_size - resid;
     cmd->iov_buf = NULL;
@@ -1171,7 +1185,7 @@ static int megasas_dcmd_ld_get_list(MegasasState *s, MegasasCmd *cmd)
     info.ld_count = cpu_to_le32(num_ld_disks);
     trace_megasas_dcmd_ld_get_list(cmd->index, num_ld_disks, max_ld_disks);
 
-    resid = dma_buf_read(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    dma_buf_read(&info, dcmd_size, &resid, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     cmd->iov_size = dcmd_size - resid;
     return MFI_STAT_OK;
 }
@@ -1220,7 +1234,7 @@ static int megasas_dcmd_ld_list_query(MegasasState *s, MegasasCmd *cmd)
     info.size = dcmd_size;
     trace_megasas_dcmd_ld_get_list(cmd->index, num_ld_disks, max_ld_disks);
 
-    resid = dma_buf_read(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    dma_buf_read(&info, dcmd_size, &resid, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     cmd->iov_size = dcmd_size - resid;
     return MFI_STAT_OK;
 }
@@ -1231,9 +1245,10 @@ static int megasas_ld_get_info_submit(SCSIDevice *sdev, int lun,
     struct mfi_ld_info *info = cmd->iov_buf;
     size_t dcmd_size = sizeof(struct mfi_ld_info);
     uint8_t cdb[6];
-    ssize_t len, resid;
+    ssize_t len;
     uint16_t sdev_id = ((sdev->id & 0xFF) << 8) | (lun & 0xFF);
     uint64_t ld_size;
+    uint64_t resid;
 
     if (!cmd->iov_buf) {
         cmd->iov_buf = g_malloc0(dcmd_size);
@@ -1270,7 +1285,8 @@ static int megasas_ld_get_info_submit(SCSIDevice *sdev, int lun,
     info->ld_config.span[0].num_blocks = info->size;
     info->ld_config.span[0].array_ref = cpu_to_le16(sdev_id);
 
-    resid = dma_buf_read(cmd->iov_buf, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    dma_buf_read(cmd->iov_buf, dcmd_size, &resid, &cmd->qsg,
+                 MEMTXATTRS_UNSPECIFIED);
     g_free(cmd->iov_buf);
     cmd->iov_size = dcmd_size - resid;
     cmd->iov_buf = NULL;
@@ -1315,6 +1331,7 @@ static int megasas_dcmd_cfg_read(MegasasState *s, MegasasCmd *cmd)
     struct mfi_config_data *info;
     int num_pd_disks = 0, array_offset, ld_offset;
     BusChild *kid;
+    uint64_t resid;
 
     if (cmd->iov_size > 4096) {
         return MFI_STAT_INVALID_PARAMETER;
@@ -1389,7 +1406,8 @@ static int megasas_dcmd_cfg_read(MegasasState *s, MegasasCmd *cmd)
         ld_offset += sizeof(struct mfi_ld_config);
     }
 
-    cmd->iov_size -= dma_buf_read(data, info->size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    dma_buf_read(data, info->size, &resid, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    cmd->iov_size -= resid;
     return MFI_STAT_OK;
 }
 
@@ -1397,6 +1415,7 @@ static int megasas_dcmd_get_properties(MegasasState *s, MegasasCmd *cmd)
 {
     struct mfi_ctrl_props info;
     size_t dcmd_size = sizeof(info);
+    uint64_t resid;
 
     memset(&info, 0x0, dcmd_size);
     if (cmd->iov_size < dcmd_size) {
@@ -1419,7 +1438,8 @@ static int megasas_dcmd_get_properties(MegasasState *s, MegasasCmd *cmd)
     info.ecc_bucket_leak_rate = cpu_to_le16(1440);
     info.expose_encl_devices = 1;
 
-    cmd->iov_size -= dma_buf_read(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    dma_buf_read(&info, dcmd_size, &resid, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    cmd->iov_size -= resid;
     return MFI_STAT_OK;
 }
 
@@ -1464,7 +1484,7 @@ static int megasas_dcmd_set_properties(MegasasState *s, MegasasCmd *cmd)
                                             dcmd_size);
         return MFI_STAT_INVALID_PARAMETER;
     }
-    dma_buf_write(&info, dcmd_size, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
+    dma_buf_write(&info, dcmd_size, NULL, &cmd->qsg, MEMTXATTRS_UNSPECIFIED);
     trace_megasas_dcmd_unsupported(cmd->index, cmd->iov_size);
     return MFI_STAT_OK;
 }
diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
index 2b5e9dca311..34cf41796bb 100644
--- a/hw/scsi/scsi-bus.c
+++ b/hw/scsi/scsi-bus.c
@@ -1421,9 +1421,9 @@ void scsi_req_data(SCSIRequest *req, int len)
 
     buf = scsi_req_get_buf(req);
     if (req->cmd.mode == SCSI_XFER_FROM_DEV) {
-        req->resid = dma_buf_read(buf, len, req->sg, MEMTXATTRS_UNSPECIFIED);
+        dma_buf_read(buf, len, &req->resid, req->sg, MEMTXATTRS_UNSPECIFIED);
     } else {
-        req->resid = dma_buf_write(buf, len, req->sg, MEMTXATTRS_UNSPECIFIED);
+        dma_buf_write(buf, len, &req->resid, req->sg, MEMTXATTRS_UNSPECIFIED);
     }
     scsi_req_continue(req);
 }
diff --git a/softmmu/dma-helpers.c b/softmmu/dma-helpers.c
index b0be1564797..498303157e9 100644
--- a/softmmu/dma-helpers.c
+++ b/softmmu/dma-helpers.c
@@ -321,22 +321,16 @@ static MemTxResult dma_buf_rw(void *buf, int32_t len, uint64_t *residp,
     return res;
 }
 
-uint64_t dma_buf_read(void *ptr, int32_t len, QEMUSGList *sg, MemTxAttrs attrs)
+MemTxResult dma_buf_read(void *ptr, int32_t len, uint64_t *residp,
+                         QEMUSGList *sg, MemTxAttrs attrs)
 {
-    uint64_t resid;
-
-    dma_buf_rw(ptr, len, &resid, sg, DMA_DIRECTION_FROM_DEVICE, attrs);
-
-    return resid;
+    return dma_buf_rw(ptr, len, residp, sg, DMA_DIRECTION_FROM_DEVICE, attrs);
 }
 
-uint64_t dma_buf_write(void *ptr, int32_t len, QEMUSGList *sg, MemTxAttrs attrs)
+MemTxResult dma_buf_write(void *ptr, int32_t len, uint64_t *residp,
+                          QEMUSGList *sg, MemTxAttrs attrs)
 {
-    uint64_t resid;
-
-    dma_buf_rw(ptr, len, &resid, sg, DMA_DIRECTION_TO_DEVICE, attrs);
-
-    return resid;
+    return dma_buf_rw(ptr, len, residp, sg, DMA_DIRECTION_TO_DEVICE, attrs);
 }
 
 void dma_acct_start(BlockBackend *blk, BlockAcctCookie *cookie,
-- 
2.33.1

Re: [PATCH 8/8] dma: Let dma_buf_read() / dma_buf_write() propagate MemTxResult

[Philippe Mathieu-Daudé]

On 12/16/21 13:35, Philippe Mathieu-Daudé wrote:
> Since the previous commit, dma_buf_rw() returns a MemTxResult
> type. Do not discard it, return it to the caller.
> 
> Since both dma_buf_read/dma_buf_write functions were previously
> returning the QEMUSGList size not consumed, add an extra argument
> where the unconsummed size can be stored.
> 
> Update the few callers.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  include/sysemu/dma.h  |  6 ++++--
>  hw/ide/ahci.c         |  8 ++++----
>  hw/nvme/ctrl.c        |  4 ++--
>  hw/scsi/megasas.c     | 48 ++++++++++++++++++++++++++++++-------------
>  hw/scsi/scsi-bus.c    |  4 ++--
>  softmmu/dma-helpers.c | 18 ++++++----------
>  6 files changed, 52 insertions(+), 36 deletions(-)
> 
> diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h
> index cdf379fecad..9f998edbea4 100644
> --- a/include/sysemu/dma.h
> +++ b/include/sysemu/dma.h
> @@ -303,8 +303,10 @@ BlockAIOCB *dma_blk_read(BlockBackend *blk,
>  BlockAIOCB *dma_blk_write(BlockBackend *blk,
>                            QEMUSGList *sg, uint64_t offset, uint32_t align,
>                            BlockCompletionFunc *cb, void *opaque);
> -uint64_t dma_buf_read(void *ptr, int32_t len, QEMUSGList *sg, MemTxAttrs attrs);
> -uint64_t dma_buf_write(void *ptr, int32_t len, QEMUSGList *sg, MemTxAttrs attrs);
> +MemTxResult dma_buf_read(void *ptr, int32_t len, uint64_t *residp,
> +                         QEMUSGList *sg, MemTxAttrs attrs);
> +MemTxResult dma_buf_write(void *ptr, int32_t len, uint64_t *residp,
> +                          QEMUSGList *sg, MemTxAttrs attrs);

Side note, ideally all functions returning the MemTxResult
type should use the warn_unused_result attribute.

Re: [PATCH 0/8] hw: Have DMA API take MemTxAttrs arg & propagate MemTxResult (part 2)

[Klaus Jensen]

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On Dec 16 13:35, Philippe Mathieu-Daudé wrote:
> This is the continuation of part 1 (dma_memory API):
> https://www.mail-archive.com/qemu-devel@nongnu.org/msg820359.html
> 
> This series update the dma_buf API.
> 
> Based on "hw: Let the DMA API take a MemTxAttrs argument"
> Based-on: <20210702092439.989969-1-philmd@redhat.com>
> 
> Philippe Mathieu-Daudé (8):
>   dma: Have dma_buf_rw() take a void pointer
>   dma: Have dma_buf_read() / dma_buf_write() take a void pointer
>   dma: Let pci_dma_rw() take MemTxAttrs argument
>   dma: Let dma_buf_rw() take MemTxAttrs argument
>   dma: Let dma_buf_write() take MemTxAttrs argument
>   dma: Let dma_buf_read() take MemTxAttrs argument
>   dma: Let dma_buf_rw() propagate MemTxResult
>   dma: Let dma_buf_read() / dma_buf_write() propagate MemTxResult
> 
>  include/hw/pci/pci.h  | 10 +++++----
>  include/sysemu/dma.h  |  6 ++++--
>  hw/audio/intel-hda.c  |  3 ++-
>  hw/ide/ahci.c         | 10 +++++----
>  hw/nvme/ctrl.c        |  5 +++--
>  hw/scsi/esp-pci.c     |  2 +-
>  hw/scsi/megasas.c     | 48 ++++++++++++++++++++++++++++++-------------
>  hw/scsi/scsi-bus.c    |  4 ++--
>  softmmu/dma-helpers.c | 25 ++++++++++++++--------
>  9 files changed, 74 insertions(+), 39 deletions(-)
> 

LGTM.

Reviewed-by: Klaus Jensen <k.jensen@samsung.com>

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Re: [PATCH 0/8] hw: Have DMA API take MemTxAttrs arg & propagate MemTxResult (part 2)

[John Snow]

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Looks OK at a very quick glance. Very weak ACK from me.

On Thu, Dec 16, 2021 at 7:36 AM Philippe Mathieu-Daudé <philmd@redhat.com>
wrote:

> This is the continuation of part 1 (dma_memory API):
> https://www.mail-archive.com/qemu-devel@nongnu.org/msg820359.html
>
> This series update the dma_buf API.
>
> Based on "hw: Let the DMA API take a MemTxAttrs argument"
> Based-on: <20210702092439.989969-1-philmd@redhat.com>
>
> Philippe Mathieu-Daudé (8):
>   dma: Have dma_buf_rw() take a void pointer
>   dma: Have dma_buf_read() / dma_buf_write() take a void pointer
>   dma: Let pci_dma_rw() take MemTxAttrs argument
>   dma: Let dma_buf_rw() take MemTxAttrs argument
>   dma: Let dma_buf_write() take MemTxAttrs argument
>   dma: Let dma_buf_read() take MemTxAttrs argument
>   dma: Let dma_buf_rw() propagate MemTxResult
>   dma: Let dma_buf_read() / dma_buf_write() propagate MemTxResult
>
>  include/hw/pci/pci.h  | 10 +++++----
>  include/sysemu/dma.h  |  6 ++++--
>  hw/audio/intel-hda.c  |  3 ++-
>  hw/ide/ahci.c         | 10 +++++----
>  hw/nvme/ctrl.c        |  5 +++--
>  hw/scsi/esp-pci.c     |  2 +-
>  hw/scsi/megasas.c     | 48 ++++++++++++++++++++++++++++++-------------
>  hw/scsi/scsi-bus.c    |  4 ++--
>  softmmu/dma-helpers.c | 25 ++++++++++++++--------
>  9 files changed, 74 insertions(+), 39 deletions(-)
>
> --
> 2.33.1
>
>
>

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