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* [PATCH] nvme/pci: Use Discard instead of Write Zeroes on SK hynix SC300
@ 2020-04-17  8:36 Kai-Heng Feng
  2020-04-17 12:59 ` Christoph Hellwig
                   ` (2 more replies)
  0 siblings, 3 replies; 10+ messages in thread
From: Kai-Heng Feng @ 2020-04-17  8:36 UTC (permalink / raw)
  To: kbusch, axboe, hch, sagi
  Cc: Kai-Heng Feng, open list:NVM EXPRESS DRIVER, linux-stable, open list

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
  2020-04-17  8:36 [PATCH] nvme/pci: Use Discard instead of Write Zeroes on SK hynix SC300 Kai-Heng Feng
@ 2020-04-17 12:59 ` Christoph Hellwig
  2020-04-21  4:51   ` Kai-Heng Feng
  2020-04-17 19:25 ` Chaitanya Kulkarni
  2020-07-23 15:57 ` [PATCH v2] nvme/pci: Add new quirk for SK hynix PC400 NLB off-by-one bug Kai-Heng Feng
  2 siblings, 1 reply; 10+ messages in thread
From: Christoph Hellwig @ 2020-04-17 12:59 UTC (permalink / raw)
  To: Kai-Heng Feng
  Cc: sagi, open list, open list:NVM EXPRESS DRIVER, axboe,
	linux-stable, kbusch, hch

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
  2020-04-17  8:36 [PATCH] nvme/pci: Use Discard instead of Write Zeroes on SK hynix SC300 Kai-Heng Feng
  2020-04-17 12:59 ` Christoph Hellwig
@ 2020-04-17 19:25 ` Chaitanya Kulkarni
  2020-04-21  4:51   ` Kai-Heng Feng
  2020-07-23 15:57 ` [PATCH v2] nvme/pci: Add new quirk for SK hynix PC400 NLB off-by-one bug Kai-Heng Feng
  2 siblings, 1 reply; 10+ messages in thread
From: Chaitanya Kulkarni @ 2020-04-17 19:25 UTC (permalink / raw)
  To: Kai-Heng Feng, kbusch, axboe, hch, sagi
  Cc: linux-stable, open list:NVM EXPRESS DRIVER, open list

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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^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH] nvme/pci: Use Discard instead of Write Zeroes on SK hynix SC300
  2020-04-17 12:59 ` Christoph Hellwig
@ 2020-04-21  4:51   ` Kai-Heng Feng
  0 siblings, 0 replies; 10+ messages in thread
From: Kai-Heng Feng @ 2020-04-21  4:51 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: Sagi Grimberg, open list, open list:NVM EXPRESS DRIVER,
	Jens Axboe, linux-stable, Keith Busch



> 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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^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH] nvme/pci: Use Discard instead of Write Zeroes on SK hynix SC300
  2020-04-17 19:25 ` Chaitanya Kulkarni
@ 2020-04-21  4:51   ` Kai-Heng Feng
  0 siblings, 0 replies; 10+ messages in thread
From: Kai-Heng Feng @ 2020-04-21  4:51 UTC (permalink / raw)
  To: Chaitanya Kulkarni
  Cc: sagi, open list, linux-stable, axboe,
	open list:NVM EXPRESS DRIVER, kbusch, hch



> 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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^ permalink raw reply	[flat|nested] 10+ messages in thread

* [PATCH v2] nvme/pci: Add new quirk for SK hynix PC400 NLB off-by-one bug
  2020-04-17  8:36 [PATCH] nvme/pci: Use Discard instead of Write Zeroes on SK hynix SC300 Kai-Heng Feng
  2020-04-17 12:59 ` Christoph Hellwig
  2020-04-17 19:25 ` Chaitanya Kulkarni
@ 2020-07-23 15:57 ` Kai-Heng Feng
  2020-07-23 16:03   ` Christoph Hellwig
  2020-07-23 17:29   ` [PATCH v3] nvme/pci: Prevent SK hynix PC400 from using Write Zeroes command Kai-Heng Feng
  2 siblings, 2 replies; 10+ messages in thread
From: Kai-Heng Feng @ 2020-07-23 15:57 UTC (permalink / raw)
  To: kbusch, axboe, hch, sagi
  Cc: Kai-Heng Feng, kyounghwan sohn, open list, open list:NVM EXPRESS DRIVER

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
  2020-07-23 15:57 ` [PATCH v2] nvme/pci: Add new quirk for SK hynix PC400 NLB off-by-one bug Kai-Heng Feng
@ 2020-07-23 16:03   ` Christoph Hellwig
  2020-07-23 16:10     ` Kai-Heng Feng
  2020-07-23 17:29   ` [PATCH v3] nvme/pci: Prevent SK hynix PC400 from using Write Zeroes command Kai-Heng Feng
  1 sibling, 1 reply; 10+ messages in thread
From: Christoph Hellwig @ 2020-07-23 16:03 UTC (permalink / raw)
  To: Kai-Heng Feng
  Cc: sagi, open list, open list:NVM EXPRESS DRIVER, axboe, kbusch,
	kyounghwan sohn, hch

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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^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH v2] nvme/pci: Add new quirk for SK hynix PC400 NLB off-by-one bug
  2020-07-23 16:03   ` Christoph Hellwig
@ 2020-07-23 16:10     ` Kai-Heng Feng
  0 siblings, 0 replies; 10+ messages in thread
From: Kai-Heng Feng @ 2020-07-23 16:10 UTC (permalink / raw)
  To: Christoph Hellwig
  Cc: sagi, open list, open list:NVM EXPRESS DRIVER, axboe, kbusch,
	kyounghwan sohn


> 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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^ permalink raw reply	[flat|nested] 10+ messages in thread

* [PATCH v3] nvme/pci: Prevent SK hynix PC400 from using Write Zeroes command
  2020-07-23 15:57 ` [PATCH v2] nvme/pci: Add new quirk for SK hynix PC400 NLB off-by-one bug Kai-Heng Feng
  2020-07-23 16:03   ` Christoph Hellwig
@ 2020-07-23 17:29   ` Kai-Heng Feng
  2020-07-26 15:29     ` Christoph Hellwig
  1 sibling, 1 reply; 10+ messages in thread
From: Kai-Heng Feng @ 2020-07-23 17:29 UTC (permalink / raw)
  To: kbusch, axboe, hch, sagi
  Cc: Kai-Heng Feng, kyounghwan sohn, open list, open list:NVM EXPRESS DRIVER

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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^ permalink raw reply	[flat|nested] 10+ messages in thread

* Re: [PATCH v3] nvme/pci: Prevent SK hynix PC400 from using Write Zeroes command
  2020-07-23 17:29   ` [PATCH v3] nvme/pci: Prevent SK hynix PC400 from using Write Zeroes command Kai-Heng Feng
@ 2020-07-26 15:29     ` Christoph Hellwig
  0 siblings, 0 replies; 10+ messages in thread
From: Christoph Hellwig @ 2020-07-26 15:29 UTC (permalink / raw)
  To: Kai-Heng Feng
  Cc: sagi, open list, open list:NVM EXPRESS DRIVER, axboe, kbusch,
	kyounghwan sohn, hch

Thanks,

applied to nvme-5.8.

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^ permalink raw reply	[flat|nested] 10+ messages in thread

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Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-04-17  8:36 [PATCH] nvme/pci: Use Discard instead of Write Zeroes on SK hynix SC300 Kai-Heng Feng
2020-04-17 12:59 ` Christoph Hellwig
2020-04-21  4:51   ` Kai-Heng Feng
2020-04-17 19:25 ` Chaitanya Kulkarni
2020-04-21  4:51   ` Kai-Heng Feng
2020-07-23 15:57 ` [PATCH v2] nvme/pci: Add new quirk for SK hynix PC400 NLB off-by-one bug Kai-Heng Feng
2020-07-23 16:03   ` Christoph Hellwig
2020-07-23 16:10     ` Kai-Heng Feng
2020-07-23 17:29   ` [PATCH v3] nvme/pci: Prevent SK hynix PC400 from using Write Zeroes command Kai-Heng Feng
2020-07-26 15:29     ` Christoph Hellwig

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