linux-kernel - [PATCH v6 5/6] pmem: refactor pmem_clear

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-Id: <20220319062833.3136528-6-jane.chu@oracle.com>
Date:   Sat, 19 Mar 2022 00:28:32 -0600
From:   Jane Chu <jane.chu@...cle.com>
To:     david@...morbit.com, djwong@...nel.org, dan.j.williams@...el.com,
        hch@...radead.org, vishal.l.verma@...el.com, dave.jiang@...el.com,
        agk@...hat.com, snitzer@...hat.com, dm-devel@...hat.com,
        ira.weiny@...el.com, willy@...radead.org, vgoyal@...hat.com,
        linux-fsdevel@...r.kernel.org, nvdimm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org
Subject: [PATCH v6 5/6] pmem: refactor pmem_clear_poison()

Refactor the pmem_clear_poison() in order to share common code
later.

Signed-off-by: Jane Chu <jane.chu@...cle.com>
---
 drivers/nvdimm/pmem.c | 81 ++++++++++++++++++++++++++++++-------------
 1 file changed, 56 insertions(+), 25 deletions(-)

diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 7cdaa279beca..18f357fbef69 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -45,10 +45,27 @@ static struct nd_region *to_region(struct pmem_device *pmem)
 	return to_nd_region(to_dev(pmem)->parent);
 }
 
-static void hwpoison_clear(struct pmem_device *pmem,
-		phys_addr_t phys, unsigned int len)
+static phys_addr_t to_phys(struct pmem_device *pmem, phys_addr_t offset)
 {
+	return pmem->phys_addr + offset;
+}
+
+static sector_t to_sect(struct pmem_device *pmem, phys_addr_t offset)
+{
+	return (offset - pmem->data_offset) / 512;
+}
+
+static phys_addr_t to_offset(struct pmem_device *pmem, sector_t sector)
+{
+	return sector * 512 + pmem->data_offset;
+}
+
+static void clear_hwpoison(struct pmem_device *pmem, phys_addr_t offset,
+		unsigned int len)
+{
+	phys_addr_t phys = to_phys(pmem, offset);
 	unsigned long pfn_start, pfn_end, pfn;
+	unsigned int blks = len / 512;
 
 	/* only pmem in the linear map supports HWPoison */
 	if (is_vmalloc_addr(pmem->virt_addr))
@@ -67,33 +84,47 @@ static void hwpoison_clear(struct pmem_device *pmem,
 		if (test_and_clear_pmem_poison(page))
 			clear_mce_nospec(pfn);
 	}
+
+	dev_dbg(to_dev(pmem), "%#llx clear %u sector%s\n",
+		(unsigned long long) to_sect(pmem, offset), blks,
+		blks > 1 ? "s" : "");
 }
 
-static blk_status_t pmem_clear_poison(struct pmem_device *pmem,
-		phys_addr_t offset, unsigned int len)
+static void clear_bb(struct pmem_device *pmem, sector_t sector, long blks)
 {
-	struct device *dev = to_dev(pmem);
-	sector_t sector;
+	badblocks_clear(&pmem->bb, sector, blks);
+	if (pmem->bb_state)
+		sysfs_notify_dirent(pmem->bb_state);
+}
+
+static blk_status_t __pmem_clear_poison(struct pmem_device *pmem,
+		phys_addr_t offset, unsigned int len,
+		unsigned int *blks)
+{
+	phys_addr_t phys = to_phys(pmem, offset);
 	long cleared;
-	blk_status_t rc = BLK_STS_OK;
-
-	sector = (offset - pmem->data_offset) / 512;
-
-	cleared = nvdimm_clear_poison(dev, pmem->phys_addr + offset, len);
-	if (cleared < len)
-		rc = BLK_STS_IOERR;
-	if (cleared > 0 && cleared / 512) {
-		hwpoison_clear(pmem, pmem->phys_addr + offset, cleared);
-		cleared /= 512;
-		dev_dbg(dev, "%#llx clear %ld sector%s\n",
-				(unsigned long long) sector, cleared,
-				cleared > 1 ? "s" : "");
-		badblocks_clear(&pmem->bb, sector, cleared);
-		if (pmem->bb_state)
-			sysfs_notify_dirent(pmem->bb_state);
-	}
+	blk_status_t rc;
 
+	cleared = nvdimm_clear_poison(to_dev(pmem), phys, len);
+	*blks = cleared / 512;
+	rc = (cleared < len) ? BLK_STS_IOERR : BLK_STS_OK;
+	if (cleared <= 0 || *blks == 0)
+		return rc;
+
+	clear_hwpoison(pmem, offset, cleared);
 	arch_invalidate_pmem(pmem->virt_addr + offset, len);
+	return rc;
+}
+
+static blk_status_t pmem_clear_poison(struct pmem_device *pmem,
+		phys_addr_t offset, unsigned int len)
+{
+	unsigned int blks;
+	blk_status_t rc;
+
+	rc = __pmem_clear_poison(pmem, offset, len, &blks);
+	if (blks > 0)
+		clear_bb(pmem, to_sect(pmem, offset), blks);
 
 	return rc;
 }
@@ -143,7 +174,7 @@ static blk_status_t pmem_do_read(struct pmem_device *pmem,
 			sector_t sector, unsigned int len)
 {
 	blk_status_t rc;
-	phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
+	phys_addr_t pmem_off = to_offset(pmem, sector);
 	void *pmem_addr = pmem->virt_addr + pmem_off;
 
 	if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
@@ -158,7 +189,7 @@ static blk_status_t pmem_do_write(struct pmem_device *pmem,
 			struct page *page, unsigned int page_off,
 			sector_t sector, unsigned int len)
 {
-	phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
+	phys_addr_t pmem_off = to_offset(pmem, sector);
 	void *pmem_addr = pmem->virt_addr + pmem_off;
 
 	if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) {
-- 
2.18.4