[PATCH v2] nvme: add a Identify Namespace Identification Descriptor list quirk

* [PATCH v2] nvme: add a Identify Namespace Identification Descriptor list quirk
@ 2020-07-29  5:44 Christoph Hellwig
  2020-07-29  5:56 ` Sagi Grimberg
  2020-07-29 18:15 ` Chaitanya Kulkarni
  0 siblings, 2 replies; 3+ messages in thread
From: Christoph Hellwig @ 2020-07-29  5:44 UTC (permalink / raw)
  To: kbusch, linux-nvme; +Cc: Ingo Brunberg, Sagi Grimberg

Add a quirk for a device that does not support the Identify Namespace
Identification Descriptor list despite claiming 1.3 compliance.

Reported-by: Ingo Brunberg <ingo_brunberg@web.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Ingo Brunberg <ingo_brunberg@web.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
---

Now actually against nvme-5.8, and with cosmetic modifications to
reduce the amount of merge conflicts vs the 5.9 branch..

 drivers/nvme/host/core.c | 15 +++------------
 drivers/nvme/host/nvme.h |  7 +++++++
 drivers/nvme/host/pci.c  |  2 ++
 3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index add040168e67e2..4ee2330c603e77 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1102,6 +1102,9 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
 	int pos;
 	int len;
 
+	if (ctrl->quirks & NVME_QUIRK_NO_NS_DESC_LIST)
+		return 0;
+
 	c.identify.opcode = nvme_admin_identify;
 	c.identify.nsid = cpu_to_le32(nsid);
 	c.identify.cns = NVME_ID_CNS_NS_DESC_LIST;
@@ -1115,18 +1118,6 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
 	if (status) {
 		dev_warn(ctrl->device,
 			"Identify Descriptors failed (%d)\n", status);
-		 /*
-		  * Don't treat non-retryable errors as fatal, as we potentially
-		  * already have a NGUID or EUI-64.  If we failed with DNR set,
-		  * we want to silently ignore the error as we can still
-		  * identify the device, but if the status has DNR set, we want
-		  * to propagate the error back specifically for the disk
-		  * revalidation flow to make sure we don't abandon the
-		  * device just because of a temporal retry-able error (such
-		  * as path of transport errors).
-		  */
-		if (status > 0 && (status & NVME_SC_DNR))
-			status = 0;
 		goto free_data;
 	}
 
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 1de3f9b827aa56..09ffc3246f60e4 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -129,6 +129,13 @@ enum nvme_quirks {
 	 * Don't change the value of the temperature threshold feature
 	 */
 	NVME_QUIRK_NO_TEMP_THRESH_CHANGE	= (1 << 14),
+
+	/*
+	 * The controller doesn't handle the Identify Namespace
+	 * Identification Descriptor list subcommand despite claiming
+	 * NVMe 1.3 compliance.
+	 */
+	NVME_QUIRK_NO_NS_DESC_LIST		= (1 << 15),
 };
 
 /*
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 25a187e43dbe74..d4b1ff7471231b 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -3099,6 +3099,8 @@ static const struct pci_device_id nvme_id_table[] = {
 	{ PCI_VDEVICE(INTEL, 0x5845),	/* Qemu emulated controller */
 		.driver_data = NVME_QUIRK_IDENTIFY_CNS |
 				NVME_QUIRK_DISABLE_WRITE_ZEROES, },
+	{ PCI_DEVICE(0x126f, 0x2263),	/* Silicon Motion unidentified */
+		.driver_data = NVME_QUIRK_NO_NS_DESC_LIST, },
 	{ PCI_DEVICE(0x1bb1, 0x0100),   /* Seagate Nytro Flash Storage */
 		.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
 	{ PCI_DEVICE(0x1c58, 0x0003),	/* HGST adapter */
-- 
2.27.0


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