linux-kernel - [PATCH 3/8] pstore/ram: Report backend assignments with finer granularity

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Message-Id: <20181101235200.28584-4-keescook@chromium.org>
Date:   Thu,  1 Nov 2018 16:51:55 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>
Subject: [PATCH 3/8] pstore/ram: Report backend assignments with finer granularity

In order to more easily perform automated regression testing, this
adds pr_debug() calls to report each prz allocation which can then be
verified against persistent storage. Specifically, seeing the dividing
line between header, data, any ECC bytes. (And the general assignment
output is updated to remove the bogus ECC blocksize which isn't actually
recorded outside the prz instance.)

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 fs/pstore/ram.c      | 4 ++--
 fs/pstore/ram_core.c | 6 ++++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index b51901f97dc2..25bede911809 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -856,9 +856,9 @@ static int ramoops_probe(struct platform_device *pdev)
 	ramoops_pmsg_size = pdata->pmsg_size;
 	ramoops_ftrace_size = pdata->ftrace_size;
 
-	pr_info("attached 0x%lx@...llx, ecc: %d/%d\n",
+	pr_info("using 0x%lx@...llx, ecc: %d\n",
 		cxt->size, (unsigned long long)cxt->phys_addr,
-		cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
+		cxt->ecc_info.ecc_size);
 
 	return 0;
 
diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index f5d0173901aa..d5bf9be82545 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -576,6 +576,12 @@ struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,
 	if (ret)
 		goto err;
 
+	pr_debug("attached %s 0x%lx@...llx: %lu header, %lu data, %lu ecc (%d/%d)\n",
+		prz->label, prz->size, (unsigned long long)prz->paddr,
+		sizeof(*prz->buffer), prz->buffer_size,
+		prz->size - sizeof(*prz->buffer) - prz->buffer_size,
+		prz->ecc_info.ecc_size, prz->ecc_info.block_size);
+
 	return prz;
 err:
 	persistent_ram_free(prz);
-- 
2.17.1