[Qemu-devel] [PATCH v4 17/17] sdhci: add a "dma-memory" property

[Philippe Mathieu-Daudé]

Add a dma property allowing machine creation to provide the address-space
sdhci dma operates on.

[based on a patch from Alistair Francis <address@hidden>
 from qemu/xilinx tag xilinx-v2016.1]
Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
Reviewed-by: Alistair Francis <address@hidden>
---
 include/hw/sd/sdhci.h |  2 ++
 hw/sd/sdhci.c         | 36 +++++++++++++++++++++++-------------
 2 files changed, 25 insertions(+), 13 deletions(-)

diff --git a/include/hw/sd/sdhci.h b/include/hw/sd/sdhci.h
index 9436375b1e..2aea20f1d8 100644
--- a/include/hw/sd/sdhci.h
+++ b/include/hw/sd/sdhci.h
@@ -41,6 +41,8 @@ typedef struct SDHCIState {
     /*< public >*/
     SDBus sdbus;
     MemoryRegion iomem;
+    MemoryRegion *dma_mr;
+    AddressSpace dma_as;
 
     QEMUTimer *insert_timer;       /* timer for 'changing' sd card. */
     QEMUTimer *transfer_timer;
diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index 97129e178e..a5e63dbd56 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -502,7 +502,7 @@ static void sdhci_sdma_transfer_multi_blocks(SDHCIState *s)
                     s->blkcnt--;
                 }
             }
-            dma_memory_write(&address_space_memory, s->sdmasysad,
+            dma_memory_write(&s->dma_as, s->sdmasysad,
                              &s->fifo_buffer[begin], s->data_count - begin);
             s->sdmasysad += s->data_count - begin;
             if (s->data_count == block_size) {
@@ -524,7 +524,7 @@ static void sdhci_sdma_transfer_multi_blocks(SDHCIState *s)
                 s->data_count = block_size;
                 boundary_count -= block_size - begin;
             }
-            dma_memory_read(&address_space_memory, s->sdmasysad,
+            dma_memory_read(&s->dma_as, s->sdmasysad,
                             &s->fifo_buffer[begin], s->data_count - begin);
             s->sdmasysad += s->data_count - begin;
             if (s->data_count == block_size) {
@@ -562,11 +562,9 @@ static void sdhci_sdma_transfer_single_block(SDHCIState *s)
         for (n = 0; n < datacnt; n++) {
             s->fifo_buffer[n] = sdbus_read_data(&s->sdbus);
         }
-        dma_memory_write(&address_space_memory, s->sdmasysad, s->fifo_buffer,
-                         datacnt);
+        dma_memory_write(&s->dma_as, s->sdmasysad, s->fifo_buffer, datacnt);
     } else {
-        dma_memory_read(&address_space_memory, s->sdmasysad, s->fifo_buffer,
-                        datacnt);
+        dma_memory_read(&s->dma_as, s->sdmasysad, s->fifo_buffer, datacnt);
         for (n = 0; n < datacnt; n++) {
             sdbus_write_data(&s->sdbus, s->fifo_buffer[n]);
         }
@@ -590,7 +588,7 @@ static void get_adma_description(SDHCIState *s, ADMADescr 
*dscr)
     hwaddr entry_addr = (hwaddr)s->admasysaddr;
     switch (SDHC_DMA_TYPE(s->hostctl)) {
     case SDHC_CTRL_ADMA2_32:
-        dma_memory_read(&address_space_memory, entry_addr, (uint8_t *)&adma2,
+        dma_memory_read(&s->dma_as, entry_addr, (uint8_t *)&adma2,
                         sizeof(adma2));
         adma2 = le64_to_cpu(adma2);
         /* The spec does not specify endianness of descriptor table.
@@ -602,7 +600,7 @@ static void get_adma_description(SDHCIState *s, ADMADescr 
*dscr)
         dscr->incr = 8;
         break;
     case SDHC_CTRL_ADMA1_32:
-        dma_memory_read(&address_space_memory, entry_addr, (uint8_t *)&adma1,
+        dma_memory_read(&s->dma_as, entry_addr, (uint8_t *)&adma1,
                         sizeof(adma1));
         adma1 = le32_to_cpu(adma1);
         dscr->addr = (hwaddr)(adma1 & 0xFFFFF000);
@@ -615,12 +613,12 @@ static void get_adma_description(SDHCIState *s, ADMADescr 
*dscr)
         }
         break;
     case SDHC_CTRL_ADMA2_64:
-        dma_memory_read(&address_space_memory, entry_addr,
+        dma_memory_read(&s->dma_as, entry_addr,
                         (uint8_t *)(&dscr->attr), 1);
-        dma_memory_read(&address_space_memory, entry_addr + 2,
+        dma_memory_read(&s->dma_as, entry_addr + 2,
                         (uint8_t *)(&dscr->length), 2);
         dscr->length = le16_to_cpu(dscr->length);
-        dma_memory_read(&address_space_memory, entry_addr + 4,
+        dma_memory_read(&s->dma_as, entry_addr + 4,
                         (uint8_t *)(&dscr->addr), 8);
         dscr->attr = le64_to_cpu(dscr->attr);
         dscr->attr &= 0xfffffff8;
@@ -679,7 +677,7 @@ static void sdhci_do_adma(SDHCIState *s)
                         s->data_count = block_size;
                         length -= block_size - begin;
                     }
-                    dma_memory_write(&address_space_memory, dscr.addr,
+                    dma_memory_write(&s->dma_as, dscr.addr,
                                      &s->fifo_buffer[begin],
                                      s->data_count - begin);
                     dscr.addr += s->data_count - begin;
@@ -703,7 +701,7 @@ static void sdhci_do_adma(SDHCIState *s)
                         s->data_count = block_size;
                         length -= block_size - begin;
                     }
-                    dma_memory_read(&address_space_memory, dscr.addr,
+                    dma_memory_read(&s->dma_as, dscr.addr,
                                     &s->fifo_buffer[begin],
                                     s->data_count - begin);
                     dscr.addr += s->data_count - begin;
@@ -1198,10 +1196,20 @@ static void sdhci_realizefn(SDHCIState *s, Error **errp)
 
     memory_region_init_io(&s->iomem, OBJECT(s), &sdhci_mmio_ops, s, "sdhci",
                           SDHC_REGISTERS_MAP_SIZE);
+
+    /* use system_memory() if property "dma-memory" not set */
+    address_space_init(&s->dma_as,
+                       s->dma_mr ? s->dma_mr : get_system_memory(),
+                       "sdhci-dma");
 }
 
 static void sdhci_unrealizefn(SDHCIState *s, Error **errp)
 {
+    if (s->dma_mr) {
+        address_space_destroy(&s->dma_as);
+        object_unparent(OBJECT(&s->dma_mr));
+    }
+
     g_free(s->fifo_buffer);
     /* This function is expected to be called only once for each class:
      * - SysBus:    via DeviceClass->unrealize(),
@@ -1288,6 +1296,8 @@ static Property sdhci_properties[] = {
     DEFINE_PROP_UINT64("maxcurr", SDHCIState, maxcurr, 0),
     DEFINE_PROP_BOOL("pending-insert-quirk", SDHCIState, pending_insert_quirk,
                      false),
+    DEFINE_PROP_LINK("dma-memory", SDHCIState, dma_mr,
+                     TYPE_MEMORY_REGION, MemoryRegion *),
     DEFINE_PROP_END_OF_LIST(),
 };
 
-- 
2.15.1