[PATCH v8 7/8] hw/misc/riscv_iopmp: Add DMA operation with IOPMP support API

[Ethan Chen]

The iopmp_dma_rw() function performs memory read/write operations to system
memory with support for IOPMP. It sends transaction information to the IOPMP
for partial hit detection.

Signed-off-by: Ethan Chen <ethan84@andestech.com>
---
 hw/misc/riscv_iopmp.c         | 68 +++++++++++++++++++++++++++++++++++
 include/hw/misc/riscv_iopmp.h |  3 +-
 2 files changed, 70 insertions(+), 1 deletion(-)

diff --git a/hw/misc/riscv_iopmp.c b/hw/misc/riscv_iopmp.c
index 374bf5c610..0be32ca819 100644
--- a/hw/misc/riscv_iopmp.c
+++ b/hw/misc/riscv_iopmp.c
@@ -1217,5 +1217,73 @@ void iopmp_setup_cpu(RISCVCPU *cpu, uint32_t rrid)
     cpu->cfg.iopmp_rrid = rrid;
 }
 
+static void send_transaction_start(IopmpState *s, uint32_t rrid)
+{
+    int flag = 0;
+    if (rrid < s->rrid_num) {
+        while (flag == 0) {
+            /* Wait last transaction of rrid complete */
+            while (s->transaction_state[rrid].running) {
+                ;
+            }
+            qemu_mutex_lock(&s->iopmp_transaction_mutex);
+            /* Check status again */
+            if (s->transaction_state[rrid].running == false) {
+                s->transaction_state[rrid].running = true;
+                s->transaction_state[rrid].supported = true;
+                flag = 1;
+            }
+            qemu_mutex_unlock(&s->iopmp_transaction_mutex);
+        }
+    }
+}
+
+static void send_transaction_complete(IopmpState *s, uint32_t rrid)
+{
+    if (rrid < s->rrid_num) {
+        qemu_mutex_lock(&s->iopmp_transaction_mutex);
+        s->transaction_state[rrid].running = false;
+        s->transaction_state[rrid].supported = false;
+        qemu_mutex_unlock(&s->iopmp_transaction_mutex);
+    }
+}
+
+static void send_transaction_info(IopmpState *s, uint32_t rrid,
+                                  hwaddr start_addr, hwaddr size)
+{
+    if (rrid < s->rrid_num) {
+        s->transaction_state[rrid].start_addr = start_addr;
+        s->transaction_state[rrid].end_addr = start_addr + size - 1;
+    }
+}
+
+/*
+ * Perform address_space_rw to system memory and send transaction information
+ * to correspond IOPMP for partially hit detection.
+ */
+MemTxResult iopmp_dma_rw(hwaddr addr, uint32_t rrid, void *buf, hwaddr len,
+                         bool is_write)
+{
+    MemTxResult result;
+    MemTxAttrs attrs;
+    iopmp_protection_memmap *map;
+    /* Find which IOPMP is responsible for receiving transaction information */
+    QLIST_FOREACH(map, &iopmp_protection_memmaps, list) {
+        if (addr >= map->entry.base &&
+            addr < map->entry.base + map->entry.size) {
+            send_transaction_start(map->iopmp_s, rrid);
+            send_transaction_info(map->iopmp_s, rrid, addr, len);
+            break;
+        }
+    }
+
+    attrs.requester_id = rrid;
+    result = address_space_rw(&address_space_memory, addr, attrs, buf, len,
+                              is_write);
+    if (map) {
+        send_transaction_complete(map->iopmp_s, rrid);
+    }
+    return result;
+}
 
 type_init(iopmp_register_types);
diff --git a/include/hw/misc/riscv_iopmp.h b/include/hw/misc/riscv_iopmp.h
index 7e7da56d10..d87395170d 100644
--- a/include/hw/misc/riscv_iopmp.h
+++ b/include/hw/misc/riscv_iopmp.h
@@ -168,5 +168,6 @@ typedef struct IopmpState {
 void iopmp_setup_system_memory(DeviceState *dev, const MemMapEntry *memmap,
                                uint32_t mapentry_num);
 void iopmp_setup_cpu(RISCVCPU *cpu, uint32_t rrid);
-
+MemTxResult iopmp_dma_rw(hwaddr addr, uint32_t rrid, void *buf, hwaddr len,
+                         bool is_write);
 #endif
-- 
2.34.1