crypto: hisilicon/sec2 - Use atomics instead of __sync

The use of __sync functions for atomic memory access is not
supported in the kernel, and can result in a link error depending
on configuration:

ERROR: "__tsan_atomic32_compare_exchange_strong" [drivers/crypto/hisilicon/sec2/hisi_sec2.ko] undefined!
ERROR: "__tsan_atomic64_fetch_add" [drivers/crypto/hisilicon/sec2/hisi_sec2.ko] undefined!

Use the kernel's own atomic interfaces instead. This way the
debugfs interface actually reads the counter atomically.

Fixes: 416d82204df4 ("crypto: hisilicon - add HiSilicon SEC V2 driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/hisilicon/sec2/sec.h b/drivers/crypto/hisilicon/sec2/sec.h
index 26754d0..b846d73 100644 (file)
--- a/drivers/crypto/hisilicon/sec2/sec.h
+++ b/drivers/crypto/hisilicon/sec2/sec.h
@@ -40,7 +40,7 @@ struct sec_req {
        int req_id;
 
        /* Status of the SEC request */
-       int fake_busy;
+       atomic_t fake_busy;
 };
 
 /**
@@ -132,8 +132,8 @@ struct sec_debug_file {
 };
 
 struct sec_dfx {
-       u64 send_cnt;
-       u64 recv_cnt;
+       atomic64_t send_cnt;
+       atomic64_t recv_cnt;
 };
 
 struct sec_debug {

diff --git a/drivers/crypto/hisilicon/sec2/sec_crypto.c b/drivers/crypto/hisilicon/sec2/sec_crypto.c
index 62b04e1..0a5391f 100644 (file)
--- a/drivers/crypto/hisilicon/sec2/sec_crypto.c
+++ b/drivers/crypto/hisilicon/sec2/sec_crypto.c
@@ -120,7 +120,7 @@ static void sec_req_cb(struct hisi_qp *qp, void *resp)
                return;
        }
 
-       __sync_add_and_fetch(&req->ctx->sec->debug.dfx.recv_cnt, 1);
+       atomic64_inc(&req->ctx->sec->debug.dfx.recv_cnt);
 
        req->ctx->req_op->buf_unmap(req->ctx, req);
 
@@ -135,13 +135,13 @@ static int sec_bd_send(struct sec_ctx *ctx, struct sec_req *req)
        mutex_lock(&qp_ctx->req_lock);
        ret = hisi_qp_send(qp_ctx->qp, &req->sec_sqe);
        mutex_unlock(&qp_ctx->req_lock);
-       __sync_add_and_fetch(&ctx->sec->debug.dfx.send_cnt, 1);
+       atomic64_inc(&ctx->sec->debug.dfx.send_cnt);
 
        if (ret == -EBUSY)
                return -ENOBUFS;
 
        if (!ret) {
-               if (req->fake_busy)
+               if (atomic_read(&req->fake_busy))
                        ret = -EBUSY;
                else
                        ret = -EINPROGRESS;
@@ -641,7 +641,7 @@ static void sec_skcipher_callback(struct sec_ctx *ctx, struct sec_req *req)
        if (ctx->c_ctx.c_mode == SEC_CMODE_CBC && req->c_req.encrypt)
                sec_update_iv(req);
 
-       if (__sync_bool_compare_and_swap(&req->fake_busy, 1, 0))
+       if (atomic_cmpxchg(&req->fake_busy, 1, 0) != 1)
                sk_req->base.complete(&sk_req->base, -EINPROGRESS);
 
        sk_req->base.complete(&sk_req->base, req->err_type);
@@ -672,9 +672,9 @@ static int sec_request_init(struct sec_ctx *ctx, struct sec_req *req)
        }
 
        if (ctx->fake_req_limit <= atomic_inc_return(&qp_ctx->pending_reqs))
-               req->fake_busy = 1;
+               atomic_set(&req->fake_busy, 1);
        else
-               req->fake_busy = 0;
+               atomic_set(&req->fake_busy, 0);
 
        ret = ctx->req_op->get_res(ctx, req);
        if (ret) {

diff --git a/drivers/crypto/hisilicon/sec2/sec_main.c b/drivers/crypto/hisilicon/sec2/sec_main.c
index 74f0654..ab742df 100644 (file)
--- a/drivers/crypto/hisilicon/sec2/sec_main.c
+++ b/drivers/crypto/hisilicon/sec2/sec_main.c
@@ -608,6 +608,14 @@ static const struct file_operations sec_dbg_fops = {
        .write = sec_debug_write,
 };
 
+static int debugfs_atomic64_t_get(void *data, u64 *val)
+{
+        *val = atomic64_read((atomic64_t *)data);
+        return 0;
+}
+DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic64_t_ro, debugfs_atomic64_t_get, NULL,
+                        "%lld\n");
+
 static int sec_core_debug_init(struct sec_dev *sec)
 {
        struct hisi_qm *qm = &sec->qm;
@@ -628,9 +636,11 @@ static int sec_core_debug_init(struct sec_dev *sec)
 
        debugfs_create_regset32("regs", 0444, tmp_d, regset);
 
-       debugfs_create_u64("send_cnt", 0444, tmp_d, &dfx->send_cnt);
+       debugfs_create_file("send_cnt", 0444, tmp_d, &dfx->send_cnt,
+                           &fops_atomic64_t_ro);
 
-       debugfs_create_u64("recv_cnt", 0444, tmp_d, &dfx->recv_cnt);
+       debugfs_create_file("recv_cnt", 0444, tmp_d, &dfx->recv_cnt,
+                           &fops_atomic64_t_ro);
 
        return 0;
 }