[PATCH] nvme/pci: Use Discard instead of Write Zeroes on SK hynix SC300

[PATCH] nvme/pci: Use Discard instead of Write Zeroes on SK hynix SC300

[Kai-Heng Feng]

After commit 6e02318eaea5 ("nvme: add support for the Write Zeroes
command"), SK hynix SC300 becomes very slow with the following error
message:
[  224.567695] blk_update_request: operation not supported error, dev nvme1n1, sector 499384320 op 0x9:(WRITE_ZEROES) flags 0x1000000 phys_seg 0 prio class 0]

Use quirk NVME_QUIRK_DEALLOCATE_ZEROES to workaround this issue.

BugLink: https://bugs.launchpad.net/bugs/1872383
Cc: linux-stable <stable@vger.kernel.org> # >= 5.1
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
 drivers/nvme/host/pci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 4e79e412b276..e3f4dac823d8 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -3068,6 +3068,8 @@ static const struct pci_device_id nvme_id_table[] = {
 		.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
 	{ PCI_DEVICE(0x1c58, 0x0023),	/* WDC SN200 adapter */
 		.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
+	{ PCI_DEVICE(0x1c5c, 0x1504),	/* SK hynix SC300 */
+		.driver_data = NVME_QUIRK_DEALLOCATE_ZEROES, },
 	{ PCI_DEVICE(0x1c5f, 0x0540),	/* Memblaze Pblaze4 adapter */
 		.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
 	{ PCI_DEVICE(0x144d, 0xa821),   /* Samsung PM1725 */
-- 
2.17.1


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Re: [PATCH] nvme/pci: Use Discard instead of Write Zeroes on SK hynix SC300

[Christoph Hellwig]

On Fri, Apr 17, 2020 at 04:36:41PM +0800, Kai-Heng Feng wrote:
> After commit 6e02318eaea5 ("nvme: add support for the Write Zeroes
> command"), SK hynix SC300 becomes very slow with the following error
> message:
> [  224.567695] blk_update_request: operation not supported error, dev nvme1n1, sector 499384320 op 0x9:(WRITE_ZEROES) flags 0x1000000 phys_seg 0 prio class 0]
> 
> Use quirk NVME_QUIRK_DEALLOCATE_ZEROES to workaround this issue.

Do you have a written guarantee from SK Hynix that it will always zero
all blocks discarded?

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Re: [PATCH] nvme/pci: Use Discard instead of Write Zeroes on SK hynix SC300

[Chaitanya Kulkarni]

On 04/17/2020 01:37 AM, Kai-Heng Feng wrote:
> After commit 6e02318eaea5 ("nvme: add support for the Write Zeroes
> command"), SK hynix SC300 becomes very slow with the following error
> message:
> [  224.567695] blk_update_request: operation not supported error, dev nvme1n1, sector 499384320 op 0x9:(WRITE_ZEROES) flags 0x1000000 phys_seg 0 prio class 0]
>
> Use quirk NVME_QUIRK_DEALLOCATE_ZEROES to workaround this issue.
Can you share
nvme id-ctrl -H /dev/nvme0 | grep oncs -A 8
output?


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Re: [PATCH] nvme/pci: Use Discard instead of Write Zeroes on SK hynix SC300

[Kai-Heng Feng]

> On Apr 17, 2020, at 20:59, Christoph Hellwig <hch@lst.de> wrote:
> 
> On Fri, Apr 17, 2020 at 04:36:41PM +0800, Kai-Heng Feng wrote:
>> After commit 6e02318eaea5 ("nvme: add support for the Write Zeroes
>> command"), SK hynix SC300 becomes very slow with the following error
>> message:
>> [  224.567695] blk_update_request: operation not supported error, dev nvme1n1, sector 499384320 op 0x9:(WRITE_ZEROES) flags 0x1000000 phys_seg 0 prio class 0]
>> 
>> Use quirk NVME_QUIRK_DEALLOCATE_ZEROES to workaround this issue.
> 
> Do you have a written guarantee from SK Hynix that it will always zero
> all blocks discarded?

Raised the issue to SK Hynix and waiting for their reply...

Kai-Heng
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Re: [PATCH] nvme/pci: Use Discard instead of Write Zeroes on SK hynix SC300

[Kai-Heng Feng]

> On Apr 18, 2020, at 03:25, Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com> wrote:
> 
> On 04/17/2020 01:37 AM, Kai-Heng Feng wrote:
>> After commit 6e02318eaea5 ("nvme: add support for the Write Zeroes
>> command"), SK hynix SC300 becomes very slow with the following error
>> message:
>> [  224.567695] blk_update_request: operation not supported error, dev nvme1n1, sector 499384320 op 0x9:(WRITE_ZEROES) flags 0x1000000 phys_seg 0 prio class 0]
>> 
>> Use quirk NVME_QUIRK_DEALLOCATE_ZEROES to workaround this issue.
> Can you share
> nvme id-ctrl -H /dev/nvme0 | grep oncs -A 8
> output?
> 

$ sudo nvme id-ctrl -H /dev/nvme0 | grep oncs -A 8
oncs      : 0x1f
  [7:7] : 0     Verify Not Supported
  [6:6] : 0     Timestamp Not Supported
  [5:5] : 0     Reservations Not Supported
  [4:4] : 0x1   Save and Select Supported
  [3:3] : 0x1   Write Zeroes Supported
  [2:2] : 0x1   Data Set Management Supported
  [1:1] : 0x1   Write Uncorrectable Supported
  [0:0] : 0x1   Compare Supported


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[PATCH v2] nvme/pci: Add new quirk for SK hynix PC400 NLB off-by-one bug

[Kai-Heng Feng]

After commit 6e02318eaea5 ("nvme: add support for the Write Zeroes
command"), SK hynix PC400 becomes very slow with the following error
message:
[  224.567695] blk_update_request: operation not supported error, dev nvme1n1, sector 499384320 op 0x9:(WRITE_ZEROES) flags 0x1000000 phys_seg 0 prio class 0]

SK Hynix PC400 has a buggy firmware that treats NLB as max value instead
of a range, so the NLB passed isn't a valid value to the firmware.

According to SK hynix there are three commands are affected:
- Write Zeroes
- Compare
- Write Uncorrectable

Write Uncorrectable isn't implemented yet, so add a new quirk to
workaround the former two commands.

BugLink: https://bugs.launchpad.net/bugs/1872383
Cc: kyounghwan sohn <kyounghwan.sohn@sk.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
v2:
- SK hynix found the root cause so change the approach accordingly.
- lspci is wrong, the device is PC400 instead of SC300.

 drivers/nvme/host/core.c | 11 ++++++++++-
 drivers/nvme/host/nvme.h |  5 +++++
 drivers/nvme/host/pci.c  |  2 ++
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index add040168e67..1b51b6f5e2dd 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -659,15 +659,21 @@ static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req,
 static inline blk_status_t nvme_setup_write_zeroes(struct nvme_ns *ns,
 		struct request *req, struct nvme_command *cmnd)
 {
+	u16 length;
+
 	if (ns->ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
 		return nvme_setup_discard(ns, req, cmnd);
 
+	length = (blk_rq_bytes(req) >> ns->lba_shift) - 1;
+	if (ns->ctrl->quirks & NVME_QUIRK_SKHYNIX_NLB_BUG)
+		length--;
+
 	cmnd->write_zeroes.opcode = nvme_cmd_write_zeroes;
 	cmnd->write_zeroes.nsid = cpu_to_le32(ns->head->ns_id);
 	cmnd->write_zeroes.slba =
 		cpu_to_le64(nvme_sect_to_lba(ns, blk_rq_pos(req)));
 	cmnd->write_zeroes.length =
-		cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
+		cpu_to_le16(length);
 	cmnd->write_zeroes.control = 0;
 	return BLK_STS_OK;
 }
@@ -1302,6 +1308,9 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
 	}
 
 	length = (io.nblocks + 1) << ns->lba_shift;
+	if (ns->ctrl->quirks & NVME_QUIRK_SKHYNIX_NLB_BUG && io.opcode == nvme_cmd_compare)
+		length--;
+
 	meta_len = (io.nblocks + 1) * ns->ms;
 	metadata = nvme_to_user_ptr(io.metadata);
 
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 1de3f9b827aa..4cbced5062a8 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -129,6 +129,11 @@ enum nvme_quirks {
 	 * Don't change the value of the temperature threshold feature
 	 */
 	NVME_QUIRK_NO_TEMP_THRESH_CHANGE	= (1 << 14),
+
+	/*
+	 * SK Hynix PC400 NLB off-by-one bug
+	 */
+	NVME_QUIRK_SKHYNIX_NLB_BUG		= (1 << 15),
 };
 
 /*
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index b1d18f0633c7..b5a54e6726e4 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -3122,6 +3122,8 @@ static const struct pci_device_id nvme_id_table[] = {
 	{ PCI_DEVICE(0x1cc1, 0x8201),   /* ADATA SX8200PNP 512GB */
 		.driver_data = NVME_QUIRK_NO_DEEPEST_PS |
 				NVME_QUIRK_IGNORE_DEV_SUBNQN, },
+	{ PCI_DEVICE(0x1c5c, 0x1504),   /* SK Hynix PC400 */
+		.driver_data = NVME_QUIRK_SKHYNIX_NLB_BUG, },
 	{ PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001),
 		.driver_data = NVME_QUIRK_SINGLE_VECTOR },
-- 
2.17.1


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Re: [PATCH v2] nvme/pci: Add new quirk for SK hynix PC400 NLB off-by-one bug

[Christoph Hellwig]

On Thu, Jul 23, 2020 at 11:57:31PM +0800, Kai-Heng Feng wrote:
> After commit 6e02318eaea5 ("nvme: add support for the Write Zeroes
> command"), SK hynix PC400 becomes very slow with the following error
> message:
> [  224.567695] blk_update_request: operation not supported error, dev nvme1n1, sector 499384320 op 0x9:(WRITE_ZEROES) flags 0x1000000 phys_seg 0 prio class 0]
> 
> SK Hynix PC400 has a buggy firmware that treats NLB as max value instead
> of a range, so the NLB passed isn't a valid value to the firmware.
> 
> According to SK hynix there are three commands are affected:
> - Write Zeroes
> - Compare
> - Write Uncorrectable
> 
> Write Uncorrectable isn't implemented yet, so add a new quirk to
> workaround the former two commands.

compare isn't implemented either in the kernel, and we certainly
aren't going to do these quirks for passthrough.  So I think we really
want a "write zeroes is buggy" quirk and just disable issuing that
command from the driver.

> 
> BugLink: https://bugs.launchpad.net/bugs/1872383
> Cc: kyounghwan sohn <kyounghwan.sohn@sk.com>
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> ---
> v2:
> - SK hynix found the root cause so change the approach accordingly.
> - lspci is wrong, the device is PC400 instead of SC300.

I don't remember seing a v1..

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Re: [PATCH v2] nvme/pci: Add new quirk for SK hynix PC400 NLB off-by-one bug

[Kai-Heng Feng]

> On Jul 24, 2020, at 00:03, Christoph Hellwig <hch@lst.de> wrote:
> 
> On Thu, Jul 23, 2020 at 11:57:31PM +0800, Kai-Heng Feng wrote:
>> After commit 6e02318eaea5 ("nvme: add support for the Write Zeroes
>> command"), SK hynix PC400 becomes very slow with the following error
>> message:
>> [  224.567695] blk_update_request: operation not supported error, dev nvme1n1, sector 499384320 op 0x9:(WRITE_ZEROES) flags 0x1000000 phys_seg 0 prio class 0]
>> 
>> SK Hynix PC400 has a buggy firmware that treats NLB as max value instead
>> of a range, so the NLB passed isn't a valid value to the firmware.
>> 
>> According to SK hynix there are three commands are affected:
>> - Write Zeroes
>> - Compare
>> - Write Uncorrectable
>> 
>> Write Uncorrectable isn't implemented yet, so add a new quirk to
>> workaround the former two commands.
> 
> compare isn't implemented either in the kernel, and we certainly
> aren't going to do these quirks for passthrough.  So I think we really
> want a "write zeroes is buggy" quirk and just disable issuing that
> command from the driver.

Ok, will send a new version based on your suggestion.

> 
>> 
>> BugLink: https://bugs.launchpad.net/bugs/1872383
>> Cc: kyounghwan sohn <kyounghwan.sohn@sk.com>
>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
>> ---
>> v2:
>> - SK hynix found the root cause so change the approach accordingly.
>> - lspci is wrong, the device is PC400 instead of SC300.
> 
> I don't remember seing a v1..

Well, because it took some time for the vendor to find the root cause...
Here's the v1:
https://lkml.org/lkml/2020/4/17/169

Kai-Heng


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[PATCH v3] nvme/pci: Prevent SK hynix PC400 from using Write Zeroes command

[Kai-Heng Feng]

After commit 6e02318eaea5 ("nvme: add support for the Write Zeroes
command"), SK hynix PC400 becomes very slow with the following error
message:
[  224.567695] blk_update_request: operation not supported error, dev nvme1n1, sector 499384320 op 0x9:(WRITE_ZEROES) flags 0x1000000 phys_seg 0 prio class 0]

SK Hynix PC400 has a buggy firmware that treats NLB as max value instead
of a range, so the NLB passed isn't a valid value to the firmware.

According to SK hynix there are three commands are affected:
- Write Zeroes
- Compare
- Write Uncorrectable

Right now only Write Zeroes is implemented, so disable it completely on
SK hynix PC400.

BugLink: https://bugs.launchpad.net/bugs/1872383
Cc: kyounghwan sohn <kyounghwan.sohn@sk.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
v3:
- Simply disable Write Zeroes command.

v2:
- SK hynix found the root cause so change the approach accordingly.
- lspci is wrong, the device is PC400 instead of SC300.

 drivers/nvme/host/pci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index b1d18f0633c7..25a187e43dbe 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -3122,6 +3122,8 @@ static const struct pci_device_id nvme_id_table[] = {
 	{ PCI_DEVICE(0x1cc1, 0x8201),   /* ADATA SX8200PNP 512GB */
 		.driver_data = NVME_QUIRK_NO_DEEPEST_PS |
 				NVME_QUIRK_IGNORE_DEV_SUBNQN, },
+	{ PCI_DEVICE(0x1c5c, 0x1504),   /* SK Hynix PC400 */
+		.driver_data = NVME_QUIRK_DISABLE_WRITE_ZEROES, },
 	{ PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001),
 		.driver_data = NVME_QUIRK_SINGLE_VECTOR },
-- 
2.17.1


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Re: [PATCH v3] nvme/pci: Prevent SK hynix PC400 from using Write Zeroes command

[Christoph Hellwig]

Thanks,

applied to nvme-5.8.

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[PATCH] nvme-pci: Disable Write Zeroes on Sandisk Skyhawk

[Kai-Heng Feng]

Like commit 5611ec2b9814 ("nvme-pci: prevent SK hynix PC400 from using
Write Zeroes command"), Sandisk Skyhawk has the same issue:
[ 6305.633887] blk_update_request: operation not supported error, dev nvme0n1, sector 340812032 op 0x9:(WRITE_ZEROES) flags 0x0 phys_seg 0 prio class 0

So also disable Write Zeroes command on Sandisk Skyhawk.

BugLink: https://bugs.launchpad.net/bugs/1899503
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
 drivers/nvme/host/pci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 8984796db0c8..d310d7317e2a 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -3187,6 +3187,8 @@ static const struct pci_device_id nvme_id_table[] = {
 				NVME_QUIRK_IGNORE_DEV_SUBNQN, },
 	{ PCI_DEVICE(0x1c5c, 0x1504),   /* SK Hynix PC400 */
 		.driver_data = NVME_QUIRK_DISABLE_WRITE_ZEROES, },
+	{ PCI_DEVICE(0x15b7, 0x2001),   /*  Sandisk Skyhawk */
+		.driver_data = NVME_QUIRK_DISABLE_WRITE_ZEROES, },
 	{ PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001),
 		.driver_data = NVME_QUIRK_SINGLE_VECTOR },
-- 
2.17.1


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Re: [PATCH] nvme-pci: Disable Write Zeroes on Sandisk Skyhawk

[Chaitanya Kulkarni]

On 10/13/20 01:45, Kai-Heng Feng wrote:
> Like commit 5611ec2b9814 ("nvme-pci: prevent SK hynix PC400 from using
> Write Zeroes command"), Sandisk Skyhawk has the same issue:
> [ 6305.633887] blk_update_request: operation not supported error, dev nvme0n1, sector 340812032 op 0x9:(WRITE_ZEROES) flags 0x0 phys_seg 0 prio class 0
>
> So also disable Write Zeroes command on Sandisk Skyhawk.
>
> BugLink: https://bugs.launchpad.net/bugs/1899503
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>

Are you sure this happens all the devices of the same model

and not a firmware bug on specific device ?

If yes then looks good.

Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>




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Re: [PATCH] nvme-pci: Disable Write Zeroes on Sandisk Skyhawk

[Kai-Heng Feng]

> On Oct 14, 2020, at 08:20, Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com> wrote:
> 
> On 10/13/20 01:45, Kai-Heng Feng wrote:
>> Like commit 5611ec2b9814 ("nvme-pci: prevent SK hynix PC400 from using
>> Write Zeroes command"), Sandisk Skyhawk has the same issue:
>> [ 6305.633887] blk_update_request: operation not supported error, dev nvme0n1, sector 340812032 op 0x9:(WRITE_ZEROES) flags 0x0 phys_seg 0 prio class 0
>> 
>> So also disable Write Zeroes command on Sandisk Skyhawk.
>> 
>> BugLink: https://bugs.launchpad.net/bugs/1899503
>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> 
> Are you sure this happens all the devices of the same model
> 
> and not a firmware bug on specific device ?
> 
> If yes then looks good.

Yes, and this is the reply from WD, requested by the user:
"These are newest WD branded drives and WD already confirmed they are
the newest firmware / no upgrades are available."

Kai-Heng

> 
> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
> 
> 
> 


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Re: [PATCH] nvme-pci: Disable Write Zeroes on Sandisk Skyhawk

[Christoph Hellwig]

Thanks,

applied to nvme-5.10.

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