linux-kernel - [PATCH v2] dmaengine: dmatest: add norandom option

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Date:   Wed, 31 Jan 2018 16:56:39 +0800
From:   Yang Shunyong <shunyong.yang@...-semitech.com>
To:     <vinod.koul@...el.com>
CC:     <dan.j.williams@...el.com>, <dmaengine@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Yang Shunyong <shunyong.yang@...-semitech.com>,
        Joey Zheng <yu.zheng@...-semitech.com>
Subject: [PATCH v2] dmaengine: dmatest: add norandom option

Existing option noverify disables both random src/dst address offset
setup and data verification. Sometimes, we need to control random
src/dst address setup and verification separately, such as disabling
random to make sure that test covers addresses in all interleaving
banks, but data verification is still performed.

This patch adds option norandom to disable random offset setup. Option
noverify has been changed to disable data verification only.

Cc: Joey Zheng <yu.zheng@...-semitech.com>
Signed-off-by: Yang Shunyong <shunyong.yang@...-semitech.com>
---

v2: change to symbolic permissions.

---
 drivers/dma/dmatest.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index 80cc2be6483c..e5e39f8131ab 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -74,7 +74,11 @@
 
 static bool noverify;
 module_param(noverify, bool, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(noverify, "Disable random data setup and verification");
+MODULE_PARM_DESC(noverify, "Disable data verification (default: verify)");
+
+static bool norandom;
+module_param(norandom, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(norandom, "Disable random offset setup (default: random)");
 
 static bool verbose;
 module_param(verbose, bool, S_IRUGO | S_IWUSR);
@@ -103,6 +107,7 @@ struct dmatest_params {
 	unsigned int	pq_sources;
 	int		timeout;
 	bool		noverify;
+	bool		norandom;
 };
 
 /**
@@ -575,7 +580,7 @@ static int dmatest_func(void *data)
 			break;
 		}
 
-		if (params->noverify)
+		if (params->norandom)
 			len = params->buf_size;
 		else
 			len = dmatest_random() % params->buf_size + 1;
@@ -586,17 +591,19 @@ static int dmatest_func(void *data)
 
 		total_len += len;
 
-		if (params->noverify) {
+		if (params->norandom) {
 			src_off = 0;
 			dst_off = 0;
 		} else {
-			start = ktime_get();
 			src_off = dmatest_random() % (params->buf_size - len + 1);
 			dst_off = dmatest_random() % (params->buf_size - len + 1);
 
 			src_off = (src_off >> align) << align;
 			dst_off = (dst_off >> align) << align;
+		}
 
+		if (!params->noverify) {
+			start = ktime_get();
 			dmatest_init_srcs(thread->srcs, src_off, len,
 					  params->buf_size, is_memset);
 			dmatest_init_dsts(thread->dsts, dst_off, len,
@@ -975,6 +982,7 @@ static void run_threaded_test(struct dmatest_info *info)
 	params->pq_sources = pq_sources;
 	params->timeout = timeout;
 	params->noverify = noverify;
+	params->norandom = norandom;
 
 	request_channels(info, DMA_MEMCPY);
 	request_channels(info, DMA_MEMSET);
-- 
1.8.3.1