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Subject[PATCH 3/3] nvme: Check if drive is locked using ATA Security
Signed-off-by: Jethro Beekman <kernel@jbeekman.nl>
---
drivers/nvme/host/core.c | 49 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 48 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index da027ed..0164122 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1389,10 +1389,57 @@ int nvme_security_recv(struct nvme_ctrl *dev, u8 protocol, void *buf,
return nvme_submit_sync_cmd(dev->admin_q, &c, buf, len);
}

+#define OACS_SECURITY (1<<0)
+#define SCSI_SECURITY_PROTOCOL_ATA_SECURITY 0xef
+#define ATA_SECURITY_LOCKED 0x4
+
static bool nvme_security_is_locked(struct nvme_ctrl *ctrl,
struct nvme_id_ctrl *id)
{
- return false;
+ int err;
+ unsigned int i;
+ bool found;
+ u8 protocols[256+8]; /* 8 byte hdr + max number of possible protocols */
+ u8 ata_security[16];
+ u16 n;
+
+ /* security commands supported? */
+ if (!(le16_to_cpu(id->oacs) & OACS_SECURITY))
+ return false;
+
+ /* list security protocols */
+ err = nvme_security_recv(ctrl, 0, protocols, sizeof(protocols));
+ if (err) {
+ dev_warn(ctrl->device, "nvme_security_recv returned error %xh\n",
+ err);
+ return false;
+ }
+
+ /* find ata security protocol */
+ n = be16_to_cpup((__be16 *)(protocols+6));
+ if (n >= 256) {
+ dev_warn(ctrl->device, "security info protocol returned more than 256 protocols\n");
+ return false;
+ }
+ found = false;
+ for (i = 0; i <= n; i++) {
+ if (protocols[8+i] == SCSI_SECURITY_PROTOCOL_ATA_SECURITY) {
+ found = true;
+ break;
+ }
+ }
+ if (!found)
+ return false;
+
+ /* do ata security identify */
+ err = nvme_security_recv(ctrl, SCSI_SECURITY_PROTOCOL_ATA_SECURITY,
+ ata_security, sizeof(ata_security))
+ if (err) {
+ dev_warn(ctrl->device, "nvme_security_recv returned error %xh\n",
+ err);
+ return false;
+ }
+ return ata_security[1] == 0xe && (ata_security[9]&ATA_SECURITY_LOCKED);
}

void nvme_scan_namespaces(struct nvme_ctrl *ctrl)
--
2.9.0
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