hw/misc/aspeed_hace: Support accumulative mode for direct access mode

Enable accumulative mode for direct access mode operations. In direct access
mode, only a single source buffer is used, so the "iovec" count is set to 1.
If "acc_mode" is enabled:
1. Accumulate "total_req_len" with the current request length ("plen").
2. Check for padding and determine whether this is the final request.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250515081008.583578-12-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

diff --git a/hw/misc/aspeed_hace.c b/hw/misc/aspeed_hace.c
index 62649b5b27c7df79cf0f3abcc6d637ad9c118742..049f732f991b701422b69ee3baef44f0b72eb8c3 100644 (file)
--- a/hw/misc/aspeed_hace.c
+++ b/hw/misc/aspeed_hace.c
@@ -151,8 +151,11 @@ static uint64_t hash_get_source_addr(AspeedHACEState *s)
     return src_addr;
 }
 
-static int hash_prepare_direct_iov(AspeedHACEState *s, struct iovec *iov)
+static int hash_prepare_direct_iov(AspeedHACEState *s, struct iovec *iov,
+                                   bool acc_mode, bool *acc_final_request)
 {
+    uint32_t total_msg_len;
+    uint32_t pad_offset;
     uint64_t src;
     void *haddr;
     hwaddr plen;
@@ -171,9 +174,23 @@ static int hash_prepare_direct_iov(AspeedHACEState *s, struct iovec *iov)
     }
 
     iov[0].iov_base = haddr;
-    iov[0].iov_len = plen;
     iov_idx = 1;
 
+    if (acc_mode) {
+        s->total_req_len += plen;
+
+        if (has_padding(s, &iov[0], plen, &total_msg_len,
+                        &pad_offset)) {
+            /* Padding being present indicates the final request */
+            *acc_final_request = true;
+            iov[0].iov_len = pad_offset;
+        } else {
+            iov[0].iov_len = plen;
+        }
+    } else {
+        iov[0].iov_len = plen;
+    }
+
     return iov_idx;
 }
 
@@ -345,7 +362,8 @@ static void do_hash_operation(AspeedHACEState *s, int algo, bool sg_mode,
     if (sg_mode) {
         iov_idx = hash_prepare_sg_iov(s, iov, acc_mode, &acc_final_request);
     } else {
-        iov_idx = hash_prepare_direct_iov(s, iov);
+        iov_idx = hash_prepare_direct_iov(s, iov, acc_mode,
+                                          &acc_final_request);
     }
 
     if (iov_idx <= 0) {