[PATCH v5 0/2] nvme-pci: add AMD PCIe quirk for NVMe simple suspend/resume

[PATCH v5 0/2] nvme-pci: add AMD PCIe quirk for NVMe simple suspend/resume

[Prike Liang]

Those patch series can handle NVMe can't suspend to D3 during s2idle
entry on some AMD platform. In this case, can be settld by assigning and
passing a PCIe bus flag to the armed device which need NVMe shutdown opt
in s2idle suspend and then use PCIe power setting to put the NVMe device
to D3.

Prike Liang (2):
  PCI: add AMD PCIe quirk for nvme shutdown opt
  nvme-pci: add AMD PCIe quirk for simple suspend/resume

 drivers/nvme/host/pci.c | 2 ++
 drivers/pci/probe.c     | 5 ++++-
 drivers/pci/quirks.c    | 7 +++++++
 include/linux/pci.h     | 2 ++
 4 files changed, 15 insertions(+), 1 deletion(-)

-- 
2.7.4

[PATCH v5 0/2] nvme-pci: add AMD PCIe quirk for NVMe simple suspend/resume

[Prike Liang]

Those patch series can handle NVMe can't suspend to D3 during s2idle
entry on some AMD platform. In this case, can be settld by assigning and
passing a PCIe bus flag to the armed device which need NVMe shutdown opt
in s2idle suspend and then use PCIe power setting to put the NVMe device
to D3.

Prike Liang (2):
  PCI: add AMD PCIe quirk for nvme shutdown opt
  nvme-pci: add AMD PCIe quirk for simple suspend/resume

 drivers/nvme/host/pci.c | 2 ++
 drivers/pci/probe.c     | 5 ++++-
 drivers/pci/quirks.c    | 7 +++++++
 include/linux/pci.h     | 2 ++
 4 files changed, 15 insertions(+), 1 deletion(-)

-- 
2.7.4


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[PATCH v5 1/2] PCI: add AMD PCIe quirk for nvme shutdown opt

[Prike Liang]

In the NVMe controller default suspend-resume seems only save/restore the
NVMe link state by APST opt and the NVMe remains in D0 during this time.
Then the NVMe device will be shutdown by SMU firmware in the s2idle entry
and then will lost the NVMe power context during s2idle resume.Finally,
the NVMe command queue request will be processed abnormally and result
in access timeout.This issue can be settled by using PCIe power set with
simple suspend-resume process path instead of APST get/set opt.

In this patch prepare a PCIe RC bus flag to identify the platform whether
need the quirk.

Cc: <stable@vger.kernel.org> # 5.10+
Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
[ck: split patches for nvme and pcie]
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Suggested-by: Keith Busch <kbusch@kernel.org>
Acked-by: Keith Busch <kbusch@kernel.org>
---
Changes in v2:
Fix the patch format and check chip root complex DID instead of PCIe RP
to avoid the storage device plugged in internal PCIe RP by USB adaptor.

Changes in v3:
According to Christoph Hellwig do NVME PCIe related identify opt better in
PCIe quirk driver rather than in NVME module.

Changes in v4:
Split the fix to PCIe and NVMe part and then call the pci_dev_put() put
the device reference count and finally refine the commit info.

Changes in v5:
According to Christoph Hellwig and Keith Busch better use a passthrough device(bus)
gloable flag to identify the NVMe shutdown opt rather than look up the device BDF.
---
 drivers/pci/probe.c  | 5 ++++-
 drivers/pci/quirks.c | 7 +++++++
 include/linux/pci.h  | 2 ++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 953f15a..34ba691e 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -558,10 +558,13 @@ static struct pci_bus *pci_alloc_bus(struct pci_bus *parent)
 	INIT_LIST_HEAD(&b->resources);
 	b->max_bus_speed = PCI_SPEED_UNKNOWN;
 	b->cur_bus_speed = PCI_SPEED_UNKNOWN;
+	if (parent) {
 #ifdef CONFIG_PCI_DOMAINS_GENERIC
-	if (parent)
 		b->domain_nr = parent->domain_nr;
 #endif
+		if (parent->bus_flags & PCI_BUS_FLAGS_DISABLE_ON_S2I)
+			b->bus_flags |= PCI_BUS_FLAGS_DISABLE_ON_S2I;
+	}
 	return b;
 }
 
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 653660e3..7c4bb8e 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -312,6 +312,13 @@ static void quirk_nopciamd(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD,	PCI_DEVICE_ID_AMD_8151_0,	quirk_nopciamd);
 
+static void quirk_amd_s2i_fixup(struct pci_dev *dev)
+{
+	dev->bus->bus_flags |= PCI_BUS_FLAGS_DISABLE_ON_S2I;
+	pci_info(dev, "AMD simple suspend opt enabled\n");
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x1630, quirk_amd_s2i_fixup);
+
 /* Triton requires workarounds to be used by the drivers */
 static void quirk_triton(struct pci_dev *dev)
 {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 53f4904..dc65219 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -240,6 +240,8 @@ enum pci_bus_flags {
 	PCI_BUS_FLAGS_NO_MMRBC	= (__force pci_bus_flags_t) 2,
 	PCI_BUS_FLAGS_NO_AERSID	= (__force pci_bus_flags_t) 4,
 	PCI_BUS_FLAGS_NO_EXTCFG	= (__force pci_bus_flags_t) 8,
+	/* Driver must pci_disable_device() for suspend-to-idle */
+	PCI_BUS_FLAGS_DISABLE_ON_S2I	= (__force pci_bus_flags_t) 16,
 };
 
 /* Values from Link Status register, PCIe r3.1, sec 7.8.8 */
-- 
2.7.4

[PATCH v5 1/2] PCI: add AMD PCIe quirk for nvme shutdown opt

[Prike Liang]

In the NVMe controller default suspend-resume seems only save/restore the
NVMe link state by APST opt and the NVMe remains in D0 during this time.
Then the NVMe device will be shutdown by SMU firmware in the s2idle entry
and then will lost the NVMe power context during s2idle resume.Finally,
the NVMe command queue request will be processed abnormally and result
in access timeout.This issue can be settled by using PCIe power set with
simple suspend-resume process path instead of APST get/set opt.

In this patch prepare a PCIe RC bus flag to identify the platform whether
need the quirk.

Cc: <stable@vger.kernel.org> # 5.10+
Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
[ck: split patches for nvme and pcie]
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Suggested-by: Keith Busch <kbusch@kernel.org>
Acked-by: Keith Busch <kbusch@kernel.org>
---
Changes in v2:
Fix the patch format and check chip root complex DID instead of PCIe RP
to avoid the storage device plugged in internal PCIe RP by USB adaptor.

Changes in v3:
According to Christoph Hellwig do NVME PCIe related identify opt better in
PCIe quirk driver rather than in NVME module.

Changes in v4:
Split the fix to PCIe and NVMe part and then call the pci_dev_put() put
the device reference count and finally refine the commit info.

Changes in v5:
According to Christoph Hellwig and Keith Busch better use a passthrough device(bus)
gloable flag to identify the NVMe shutdown opt rather than look up the device BDF.
---
 drivers/pci/probe.c  | 5 ++++-
 drivers/pci/quirks.c | 7 +++++++
 include/linux/pci.h  | 2 ++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 953f15a..34ba691e 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -558,10 +558,13 @@ static struct pci_bus *pci_alloc_bus(struct pci_bus *parent)
 	INIT_LIST_HEAD(&b->resources);
 	b->max_bus_speed = PCI_SPEED_UNKNOWN;
 	b->cur_bus_speed = PCI_SPEED_UNKNOWN;
+	if (parent) {
 #ifdef CONFIG_PCI_DOMAINS_GENERIC
-	if (parent)
 		b->domain_nr = parent->domain_nr;
 #endif
+		if (parent->bus_flags & PCI_BUS_FLAGS_DISABLE_ON_S2I)
+			b->bus_flags |= PCI_BUS_FLAGS_DISABLE_ON_S2I;
+	}
 	return b;
 }
 
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 653660e3..7c4bb8e 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -312,6 +312,13 @@ static void quirk_nopciamd(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD,	PCI_DEVICE_ID_AMD_8151_0,	quirk_nopciamd);
 
+static void quirk_amd_s2i_fixup(struct pci_dev *dev)
+{
+	dev->bus->bus_flags |= PCI_BUS_FLAGS_DISABLE_ON_S2I;
+	pci_info(dev, "AMD simple suspend opt enabled\n");
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x1630, quirk_amd_s2i_fixup);
+
 /* Triton requires workarounds to be used by the drivers */
 static void quirk_triton(struct pci_dev *dev)
 {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 53f4904..dc65219 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -240,6 +240,8 @@ enum pci_bus_flags {
 	PCI_BUS_FLAGS_NO_MMRBC	= (__force pci_bus_flags_t) 2,
 	PCI_BUS_FLAGS_NO_AERSID	= (__force pci_bus_flags_t) 4,
 	PCI_BUS_FLAGS_NO_EXTCFG	= (__force pci_bus_flags_t) 8,
+	/* Driver must pci_disable_device() for suspend-to-idle */
+	PCI_BUS_FLAGS_DISABLE_ON_S2I	= (__force pci_bus_flags_t) 16,
 };
 
 /* Values from Link Status register, PCIe r3.1, sec 7.8.8 */
-- 
2.7.4


_______________________________________________
Linux-nvme mailing list
Linux-nvme@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-nvme

RE: [PATCH v5 1/2] PCI: add AMD PCIe quirk for nvme shutdown opt

[Liang, Prike]

[AMD Public Use]

+ linux-pci for further review.

Thanks,
> -----Original Message-----
> From: Liang, Prike <Prike.Liang@amd.com>
> Sent: Thursday, April 22, 2021 9:19 AM
> To: linux-nvme@lists.infradead.org; kbusch@kernel.org; hch@infradead.org;
> Chaitanya.Kulkarni@wdc.com; gregkh@linuxfoundation.org
> Cc: stable@vger.kernel.org; Deucher, Alexander
> <Alexander.Deucher@amd.com>; S-k, Shyam-sundar <Shyam-sundar.S-
> k@amd.com>; Liang, Prike <Prike.Liang@amd.com>; Chaitanya Kulkarni
> <chaitanya.kulkarni@wdc.com>
> Subject: [PATCH v5 1/2] PCI: add AMD PCIe quirk for nvme shutdown opt
>
> In the NVMe controller default suspend-resume seems only save/restore the
> NVMe link state by APST opt and the NVMe remains in D0 during this time.
> Then the NVMe device will be shutdown by SMU firmware in the s2idle entry
> and then will lost the NVMe power context during s2idle resume.Finally, the
> NVMe command queue request will be processed abnormally and result in
> access timeout.This issue can be settled by using PCIe power set with simple
> suspend-resume process path instead of APST get/set opt.
>
> In this patch prepare a PCIe RC bus flag to identify the platform whether
> need the quirk.
>
> Cc: <stable@vger.kernel.org> # 5.10+
> Signed-off-by: Prike Liang <Prike.Liang@amd.com>
> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
> [ck: split patches for nvme and pcie]
> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
> Suggested-by: Keith Busch <kbusch@kernel.org>
> Acked-by: Keith Busch <kbusch@kernel.org>
> ---
> Changes in v2:
> Fix the patch format and check chip root complex DID instead of PCIe RP to
> avoid the storage device plugged in internal PCIe RP by USB adaptor.
>
> Changes in v3:
> According to Christoph Hellwig do NVME PCIe related identify opt better in
> PCIe quirk driver rather than in NVME module.
>
> Changes in v4:
> Split the fix to PCIe and NVMe part and then call the pci_dev_put() put the
> device reference count and finally refine the commit info.
>
> Changes in v5:
> According to Christoph Hellwig and Keith Busch better use a passthrough
> device(bus) gloable flag to identify the NVMe shutdown opt rather than look
> up the device BDF.
> ---
>  drivers/pci/probe.c  | 5 ++++-
>  drivers/pci/quirks.c | 7 +++++++
>  include/linux/pci.h  | 2 ++
>  3 files changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index
> 953f15a..34ba691e 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -558,10 +558,13 @@ static struct pci_bus *pci_alloc_bus(struct pci_bus
> *parent)
>  INIT_LIST_HEAD(&b->resources);
>  b->max_bus_speed = PCI_SPEED_UNKNOWN;
>  b->cur_bus_speed = PCI_SPEED_UNKNOWN;
> +if (parent) {
>  #ifdef CONFIG_PCI_DOMAINS_GENERIC
> -if (parent)
>  b->domain_nr = parent->domain_nr;
>  #endif
> +if (parent->bus_flags & PCI_BUS_FLAGS_DISABLE_ON_S2I)
> +b->bus_flags |= PCI_BUS_FLAGS_DISABLE_ON_S2I;
> +}
>  return b;
>  }
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index
> 653660e3..7c4bb8e 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -312,6 +312,13 @@ static void quirk_nopciamd(struct pci_dev *dev)  }
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD,
> PCI_DEVICE_ID_AMD_8151_0,quirk_nopciamd);
>
> +static void quirk_amd_s2i_fixup(struct pci_dev *dev) {
> +dev->bus->bus_flags |= PCI_BUS_FLAGS_DISABLE_ON_S2I;
> +pci_info(dev, "AMD simple suspend opt enabled\n"); }
> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x1630,
> +quirk_amd_s2i_fixup);
> +
>  /* Triton requires workarounds to be used by the drivers */  static void
> quirk_triton(struct pci_dev *dev)  { diff --git a/include/linux/pci.h
> b/include/linux/pci.h index 53f4904..dc65219 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -240,6 +240,8 @@ enum pci_bus_flags {
>  PCI_BUS_FLAGS_NO_MMRBC= (__force pci_bus_flags_t) 2,
>  PCI_BUS_FLAGS_NO_AERSID= (__force pci_bus_flags_t) 4,
>  PCI_BUS_FLAGS_NO_EXTCFG= (__force pci_bus_flags_t) 8,
> +/* Driver must pci_disable_device() for suspend-to-idle */
> +PCI_BUS_FLAGS_DISABLE_ON_S2I= (__force pci_bus_flags_t) 16,
>  };
>
>  /* Values from Link Status register, PCIe r3.1, sec 7.8.8 */
> --
> 2.7.4

RE: [PATCH v5 1/2] PCI: add AMD PCIe quirk for nvme shutdown opt

[Liang, Prike]

[AMD Public Use]

+ linux-pci for further review.

Thanks,
> -----Original Message-----
> From: Liang, Prike <Prike.Liang@amd.com>
> Sent: Thursday, April 22, 2021 9:19 AM
> To: linux-nvme@lists.infradead.org; kbusch@kernel.org; hch@infradead.org;
> Chaitanya.Kulkarni@wdc.com; gregkh@linuxfoundation.org
> Cc: stable@vger.kernel.org; Deucher, Alexander
> <Alexander.Deucher@amd.com>; S-k, Shyam-sundar <Shyam-sundar.S-
> k@amd.com>; Liang, Prike <Prike.Liang@amd.com>; Chaitanya Kulkarni
> <chaitanya.kulkarni@wdc.com>
> Subject: [PATCH v5 1/2] PCI: add AMD PCIe quirk for nvme shutdown opt
>
> In the NVMe controller default suspend-resume seems only save/restore the
> NVMe link state by APST opt and the NVMe remains in D0 during this time.
> Then the NVMe device will be shutdown by SMU firmware in the s2idle entry
> and then will lost the NVMe power context during s2idle resume.Finally, the
> NVMe command queue request will be processed abnormally and result in
> access timeout.This issue can be settled by using PCIe power set with simple
> suspend-resume process path instead of APST get/set opt.
>
> In this patch prepare a PCIe RC bus flag to identify the platform whether
> need the quirk.
>
> Cc: <stable@vger.kernel.org> # 5.10+
> Signed-off-by: Prike Liang <Prike.Liang@amd.com>
> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
> [ck: split patches for nvme and pcie]
> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
> Suggested-by: Keith Busch <kbusch@kernel.org>
> Acked-by: Keith Busch <kbusch@kernel.org>
> ---
> Changes in v2:
> Fix the patch format and check chip root complex DID instead of PCIe RP to
> avoid the storage device plugged in internal PCIe RP by USB adaptor.
>
> Changes in v3:
> According to Christoph Hellwig do NVME PCIe related identify opt better in
> PCIe quirk driver rather than in NVME module.
>
> Changes in v4:
> Split the fix to PCIe and NVMe part and then call the pci_dev_put() put the
> device reference count and finally refine the commit info.
>
> Changes in v5:
> According to Christoph Hellwig and Keith Busch better use a passthrough
> device(bus) gloable flag to identify the NVMe shutdown opt rather than look
> up the device BDF.
> ---
>  drivers/pci/probe.c  | 5 ++++-
>  drivers/pci/quirks.c | 7 +++++++
>  include/linux/pci.h  | 2 ++
>  3 files changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index
> 953f15a..34ba691e 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -558,10 +558,13 @@ static struct pci_bus *pci_alloc_bus(struct pci_bus
> *parent)
>  INIT_LIST_HEAD(&b->resources);
>  b->max_bus_speed = PCI_SPEED_UNKNOWN;
>  b->cur_bus_speed = PCI_SPEED_UNKNOWN;
> +if (parent) {
>  #ifdef CONFIG_PCI_DOMAINS_GENERIC
> -if (parent)
>  b->domain_nr = parent->domain_nr;
>  #endif
> +if (parent->bus_flags & PCI_BUS_FLAGS_DISABLE_ON_S2I)
> +b->bus_flags |= PCI_BUS_FLAGS_DISABLE_ON_S2I;
> +}
>  return b;
>  }
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index
> 653660e3..7c4bb8e 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -312,6 +312,13 @@ static void quirk_nopciamd(struct pci_dev *dev)  }
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD,
> PCI_DEVICE_ID_AMD_8151_0,quirk_nopciamd);
>
> +static void quirk_amd_s2i_fixup(struct pci_dev *dev) {
> +dev->bus->bus_flags |= PCI_BUS_FLAGS_DISABLE_ON_S2I;
> +pci_info(dev, "AMD simple suspend opt enabled\n"); }
> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x1630,
> +quirk_amd_s2i_fixup);
> +
>  /* Triton requires workarounds to be used by the drivers */  static void
> quirk_triton(struct pci_dev *dev)  { diff --git a/include/linux/pci.h
> b/include/linux/pci.h index 53f4904..dc65219 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -240,6 +240,8 @@ enum pci_bus_flags {
>  PCI_BUS_FLAGS_NO_MMRBC= (__force pci_bus_flags_t) 2,
>  PCI_BUS_FLAGS_NO_AERSID= (__force pci_bus_flags_t) 4,
>  PCI_BUS_FLAGS_NO_EXTCFG= (__force pci_bus_flags_t) 8,
> +/* Driver must pci_disable_device() for suspend-to-idle */
> +PCI_BUS_FLAGS_DISABLE_ON_S2I= (__force pci_bus_flags_t) 16,
>  };
>
>  /* Values from Link Status register, PCIe r3.1, sec 7.8.8 */
> --
> 2.7.4


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RE: [PATCH v5 1/2] PCI: add AMD PCIe quirk for nvme shutdown opt

[Liang, Prike]

[AMD Public Use]

Ping... Could I get some comments or RB on this latest series.


Thanks,
Prike
> -----Original Message-----
> From: Liang, Prike
> Sent: Thursday, May 6, 2021 11:08 AM
> To: linux-nvme@lists.infradead.org; kbusch@kernel.org; hch@infradead.org;
> Chaitanya.Kulkarni@wdc.com; gregkh@linuxfoundation.org; linux-
> pci@vger.kernel.org; Bjorn Helgaas <helgaas@kernel.org>
> Cc: stable@vger.kernel.org; Deucher, Alexander
> <Alexander.Deucher@amd.com>; S-k, Shyam-sundar <Shyam-sundar.S-
> k@amd.com>; Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>;
> rjw@rjwysocki.net
> Subject: RE: [PATCH v5 1/2] PCI: add AMD PCIe quirk for nvme shutdown opt
>
> + linux-pci for further review.
>
> Thanks,
> > -----Original Message-----
> > From: Liang, Prike <Prike.Liang@amd.com>
> > Sent: Thursday, April 22, 2021 9:19 AM
> > To: linux-nvme@lists.infradead.org; kbusch@kernel.org;
> > hch@infradead.org; Chaitanya.Kulkarni@wdc.com;
> > gregkh@linuxfoundation.org
> > Cc: stable@vger.kernel.org; Deucher, Alexander
> > <Alexander.Deucher@amd.com>; S-k, Shyam-sundar <Shyam-sundar.S-
> > k@amd.com>; Liang, Prike <Prike.Liang@amd.com>; Chaitanya Kulkarni
> > <chaitanya.kulkarni@wdc.com>
> > Subject: [PATCH v5 1/2] PCI: add AMD PCIe quirk for nvme shutdown opt
> >
> > In the NVMe controller default suspend-resume seems only save/restore
> > the NVMe link state by APST opt and the NVMe remains in D0 during this
> time.
> > Then the NVMe device will be shutdown by SMU firmware in the s2idle
> > entry and then will lost the NVMe power context during s2idle
> > resume.Finally, the NVMe command queue request will be processed
> > abnormally and result in access timeout.This issue can be settled by
> > using PCIe power set with simple suspend-resume process path instead of
> APST get/set opt.
> >
> > In this patch prepare a PCIe RC bus flag to identify the platform
> > whether need the quirk.
> >
> > Cc: <stable@vger.kernel.org> # 5.10+
> > Signed-off-by: Prike Liang <Prike.Liang@amd.com>
> > Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
> > [ck: split patches for nvme and pcie]
> > Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
> > Suggested-by: Keith Busch <kbusch@kernel.org>
> > Acked-by: Keith Busch <kbusch@kernel.org>
> > ---
> > Changes in v2:
> > Fix the patch format and check chip root complex DID instead of PCIe
> > RP to avoid the storage device plugged in internal PCIe RP by USB adaptor.
> >
> > Changes in v3:
> > According to Christoph Hellwig do NVME PCIe related identify opt
> > better in PCIe quirk driver rather than in NVME module.
> >
> > Changes in v4:
> > Split the fix to PCIe and NVMe part and then call the pci_dev_put()
> > put the device reference count and finally refine the commit info.
> >
> > Changes in v5:
> > According to Christoph Hellwig and Keith Busch better use a
> > passthrough
> > device(bus) gloable flag to identify the NVMe shutdown opt rather than
> > look up the device BDF.
> > ---
> >  drivers/pci/probe.c  | 5 ++++-
> >  drivers/pci/quirks.c | 7 +++++++
> >  include/linux/pci.h  | 2 ++
> >  3 files changed, 13 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index
> > 953f15a..34ba691e 100644
> > --- a/drivers/pci/probe.c
> > +++ b/drivers/pci/probe.c
> > @@ -558,10 +558,13 @@ static struct pci_bus *pci_alloc_bus(struct
> > pci_bus
> > *parent)
> >     INIT_LIST_HEAD(&b->resources);
> >     b->max_bus_speed = PCI_SPEED_UNKNOWN;
> >     b->cur_bus_speed = PCI_SPEED_UNKNOWN;
> > +   if (parent) {
> >  #ifdef CONFIG_PCI_DOMAINS_GENERIC
> > -   if (parent)
> >             b->domain_nr = parent->domain_nr;
> >  #endif
> > +           if (parent->bus_flags & PCI_BUS_FLAGS_DISABLE_ON_S2I)
> > +                   b->bus_flags |= PCI_BUS_FLAGS_DISABLE_ON_S2I;
> > +   }
> >     return b;
> >  }
> >
> > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index
> > 653660e3..7c4bb8e 100644
> > --- a/drivers/pci/quirks.c
> > +++ b/drivers/pci/quirks.c
> > @@ -312,6 +312,13 @@ static void quirk_nopciamd(struct pci_dev *dev)
> > }  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD,
> >     PCI_DEVICE_ID_AMD_8151_0,       quirk_nopciamd);
> >
> > +static void quirk_amd_s2i_fixup(struct pci_dev *dev) {
> > +   dev->bus->bus_flags |= PCI_BUS_FLAGS_DISABLE_ON_S2I;
> > +   pci_info(dev, "AMD simple suspend opt enabled\n"); }
> > +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x1630,
> > +quirk_amd_s2i_fixup);
> > +
> >  /* Triton requires workarounds to be used by the drivers */  static
> > void quirk_triton(struct pci_dev *dev)  { diff --git
> > a/include/linux/pci.h b/include/linux/pci.h index 53f4904..dc65219
> > 100644
> > --- a/include/linux/pci.h
> > +++ b/include/linux/pci.h
> > @@ -240,6 +240,8 @@ enum pci_bus_flags {
> >     PCI_BUS_FLAGS_NO_MMRBC  = (__force pci_bus_flags_t) 2,
> >     PCI_BUS_FLAGS_NO_AERSID = (__force pci_bus_flags_t) 4,
> >     PCI_BUS_FLAGS_NO_EXTCFG = (__force pci_bus_flags_t) 8,
> > +   /* Driver must pci_disable_device() for suspend-to-idle */
> > +   PCI_BUS_FLAGS_DISABLE_ON_S2I    = (__force pci_bus_flags_t) 16,
> >  };
> >
> >  /* Values from Link Status register, PCIe r3.1, sec 7.8.8 */
> > --
> > 2.7.4

RE: [PATCH v5 1/2] PCI: add AMD PCIe quirk for nvme shutdown opt

[Liang, Prike]

[AMD Public Use]

Ping... Could I get some comments or RB on this latest series.


Thanks,
Prike
> -----Original Message-----
> From: Liang, Prike
> Sent: Thursday, May 6, 2021 11:08 AM
> To: linux-nvme@lists.infradead.org; kbusch@kernel.org; hch@infradead.org;
> Chaitanya.Kulkarni@wdc.com; gregkh@linuxfoundation.org; linux-
> pci@vger.kernel.org; Bjorn Helgaas <helgaas@kernel.org>
> Cc: stable@vger.kernel.org; Deucher, Alexander
> <Alexander.Deucher@amd.com>; S-k, Shyam-sundar <Shyam-sundar.S-
> k@amd.com>; Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>;
> rjw@rjwysocki.net
> Subject: RE: [PATCH v5 1/2] PCI: add AMD PCIe quirk for nvme shutdown opt
>
> + linux-pci for further review.
>
> Thanks,
> > -----Original Message-----
> > From: Liang, Prike <Prike.Liang@amd.com>
> > Sent: Thursday, April 22, 2021 9:19 AM
> > To: linux-nvme@lists.infradead.org; kbusch@kernel.org;
> > hch@infradead.org; Chaitanya.Kulkarni@wdc.com;
> > gregkh@linuxfoundation.org
> > Cc: stable@vger.kernel.org; Deucher, Alexander
> > <Alexander.Deucher@amd.com>; S-k, Shyam-sundar <Shyam-sundar.S-
> > k@amd.com>; Liang, Prike <Prike.Liang@amd.com>; Chaitanya Kulkarni
> > <chaitanya.kulkarni@wdc.com>
> > Subject: [PATCH v5 1/2] PCI: add AMD PCIe quirk for nvme shutdown opt
> >
> > In the NVMe controller default suspend-resume seems only save/restore
> > the NVMe link state by APST opt and the NVMe remains in D0 during this
> time.
> > Then the NVMe device will be shutdown by SMU firmware in the s2idle
> > entry and then will lost the NVMe power context during s2idle
> > resume.Finally, the NVMe command queue request will be processed
> > abnormally and result in access timeout.This issue can be settled by
> > using PCIe power set with simple suspend-resume process path instead of
> APST get/set opt.
> >
> > In this patch prepare a PCIe RC bus flag to identify the platform
> > whether need the quirk.
> >
> > Cc: <stable@vger.kernel.org> # 5.10+
> > Signed-off-by: Prike Liang <Prike.Liang@amd.com>
> > Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
> > [ck: split patches for nvme and pcie]
> > Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
> > Suggested-by: Keith Busch <kbusch@kernel.org>
> > Acked-by: Keith Busch <kbusch@kernel.org>
> > ---
> > Changes in v2:
> > Fix the patch format and check chip root complex DID instead of PCIe
> > RP to avoid the storage device plugged in internal PCIe RP by USB adaptor.
> >
> > Changes in v3:
> > According to Christoph Hellwig do NVME PCIe related identify opt
> > better in PCIe quirk driver rather than in NVME module.
> >
> > Changes in v4:
> > Split the fix to PCIe and NVMe part and then call the pci_dev_put()
> > put the device reference count and finally refine the commit info.
> >
> > Changes in v5:
> > According to Christoph Hellwig and Keith Busch better use a
> > passthrough
> > device(bus) gloable flag to identify the NVMe shutdown opt rather than
> > look up the device BDF.
> > ---
> >  drivers/pci/probe.c  | 5 ++++-
> >  drivers/pci/quirks.c | 7 +++++++
> >  include/linux/pci.h  | 2 ++
> >  3 files changed, 13 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index
> > 953f15a..34ba691e 100644
> > --- a/drivers/pci/probe.c
> > +++ b/drivers/pci/probe.c
> > @@ -558,10 +558,13 @@ static struct pci_bus *pci_alloc_bus(struct
> > pci_bus
> > *parent)
> >     INIT_LIST_HEAD(&b->resources);
> >     b->max_bus_speed = PCI_SPEED_UNKNOWN;
> >     b->cur_bus_speed = PCI_SPEED_UNKNOWN;
> > +   if (parent) {
> >  #ifdef CONFIG_PCI_DOMAINS_GENERIC
> > -   if (parent)
> >             b->domain_nr = parent->domain_nr;
> >  #endif
> > +           if (parent->bus_flags & PCI_BUS_FLAGS_DISABLE_ON_S2I)
> > +                   b->bus_flags |= PCI_BUS_FLAGS_DISABLE_ON_S2I;
> > +   }
> >     return b;
> >  }
> >
> > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index
> > 653660e3..7c4bb8e 100644
> > --- a/drivers/pci/quirks.c
> > +++ b/drivers/pci/quirks.c
> > @@ -312,6 +312,13 @@ static void quirk_nopciamd(struct pci_dev *dev)
> > }  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD,
> >     PCI_DEVICE_ID_AMD_8151_0,       quirk_nopciamd);
> >
> > +static void quirk_amd_s2i_fixup(struct pci_dev *dev) {
> > +   dev->bus->bus_flags |= PCI_BUS_FLAGS_DISABLE_ON_S2I;
> > +   pci_info(dev, "AMD simple suspend opt enabled\n"); }
> > +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x1630,
> > +quirk_amd_s2i_fixup);
> > +
> >  /* Triton requires workarounds to be used by the drivers */  static
> > void quirk_triton(struct pci_dev *dev)  { diff --git
> > a/include/linux/pci.h b/include/linux/pci.h index 53f4904..dc65219
> > 100644
> > --- a/include/linux/pci.h
> > +++ b/include/linux/pci.h
> > @@ -240,6 +240,8 @@ enum pci_bus_flags {
> >     PCI_BUS_FLAGS_NO_MMRBC  = (__force pci_bus_flags_t) 2,
> >     PCI_BUS_FLAGS_NO_AERSID = (__force pci_bus_flags_t) 4,
> >     PCI_BUS_FLAGS_NO_EXTCFG = (__force pci_bus_flags_t) 8,
> > +   /* Driver must pci_disable_device() for suspend-to-idle */
> > +   PCI_BUS_FLAGS_DISABLE_ON_S2I    = (__force pci_bus_flags_t) 16,
> >  };
> >
> >  /* Values from Link Status register, PCIe r3.1, sec 7.8.8 */
> > --
> > 2.7.4


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Linux-nvme@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-nvme

[PATCH v5 2/2] nvme-pci: add AMD PCIe quirk for simple suspend/resume

[Prike Liang]

In the NVMe controller default suspend-resume seems only save/restore the
NVMe link state by APST opt and the NVMe remains in D0 during this time.
Then the NVMe device will be shutdown by SMU firmware in the s2idle entry
and then will lost the NVMe power context during s2idle resume.Finally,
the NVMe command queue request will be processed abnormally and result
in access timeout.This issue can be settled by using PCIe power set with
simple suspend-resume process path instead of APST get/set opt.

This patch is updating the nvme_acpi_storage_d3() with previously
added quirk.

Cc: <stable@vger.kernel.org> # 5.10+
Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
[ck: split patches for nvme and pcie]
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Suggested-by: Keith Busch <kbusch@kernel.org>
Acked-by: Keith Busch <kbusch@kernel.org>
---
Changes in v2:
Fix the patch format and check chip root complex DID instead of PCIe RP
to avoid the storage device plugged in internal PCIe RP by USB adaptor.

Changes in v3:
According to Christoph Hellwig do NVME PCIe related identify opt better in
PCIe quirk driver rather than in NVME module.

Changes in v4:
Split the fix to PCIe and NVMe part and then call the pci_dev_put() put
the device reference count and finally refine the commit info.

Changes in v5:
According to Christoph Hellwig and Keith Busch better use a passthrough device(bus)
gloable flag to identify the NVMe shutdown opt rather than look up the device BDF.
---
 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 6bad4d4..617256e 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2836,6 +2836,8 @@ static bool nvme_acpi_storage_d3(struct pci_dev *dev)
 	acpi_status status;
 	u8 val;
 
+	if (dev->bus->bus_flags & PCI_BUS_FLAGS_DISABLE_ON_S2I)
+		return true;
 	/*
 	 * Look for _DSD property specifying that the storage device on the port
 	 * must use D3 to support deep platform power savings during
-- 
2.7.4

[PATCH v5 2/2] nvme-pci: add AMD PCIe quirk for simple suspend/resume

[Prike Liang]

In the NVMe controller default suspend-resume seems only save/restore the
NVMe link state by APST opt and the NVMe remains in D0 during this time.
Then the NVMe device will be shutdown by SMU firmware in the s2idle entry
and then will lost the NVMe power context during s2idle resume.Finally,
the NVMe command queue request will be processed abnormally and result
in access timeout.This issue can be settled by using PCIe power set with
simple suspend-resume process path instead of APST get/set opt.

This patch is updating the nvme_acpi_storage_d3() with previously
added quirk.

Cc: <stable@vger.kernel.org> # 5.10+
Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
[ck: split patches for nvme and pcie]
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Suggested-by: Keith Busch <kbusch@kernel.org>
Acked-by: Keith Busch <kbusch@kernel.org>
---
Changes in v2:
Fix the patch format and check chip root complex DID instead of PCIe RP
to avoid the storage device plugged in internal PCIe RP by USB adaptor.

Changes in v3:
According to Christoph Hellwig do NVME PCIe related identify opt better in
PCIe quirk driver rather than in NVME module.

Changes in v4:
Split the fix to PCIe and NVMe part and then call the pci_dev_put() put
the device reference count and finally refine the commit info.

Changes in v5:
According to Christoph Hellwig and Keith Busch better use a passthrough device(bus)
gloable flag to identify the NVMe shutdown opt rather than look up the device BDF.
---
 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 6bad4d4..617256e 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2836,6 +2836,8 @@ static bool nvme_acpi_storage_d3(struct pci_dev *dev)
 	acpi_status status;
 	u8 val;
 
+	if (dev->bus->bus_flags & PCI_BUS_FLAGS_DISABLE_ON_S2I)
+		return true;
 	/*
 	 * Look for _DSD property specifying that the storage device on the port
 	 * must use D3 to support deep platform power savings during
-- 
2.7.4


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http://lists.infradead.org/mailman/listinfo/linux-nvme

RE: [PATCH v5 2/2] nvme-pci: add AMD PCIe quirk for simple suspend/resume

[Liang, Prike]

[AMD Public Use]

+ linux-pci for further review.

Thanks,
> -----Original Message-----
> From: Liang, Prike <Prike.Liang@amd.com>
> Sent: Thursday, April 22, 2021 9:19 AM
> To: linux-nvme@lists.infradead.org; kbusch@kernel.org; hch@infradead.org;
> Chaitanya.Kulkarni@wdc.com; gregkh@linuxfoundation.org
> Cc: stable@vger.kernel.org; Deucher, Alexander
> <Alexander.Deucher@amd.com>; S-k, Shyam-sundar <Shyam-sundar.S-
> k@amd.com>; Liang, Prike <Prike.Liang@amd.com>; Chaitanya Kulkarni
> <chaitanya.kulkarni@wdc.com>
> Subject: [PATCH v5 2/2] nvme-pci: add AMD PCIe quirk for simple
> suspend/resume
>
> In the NVMe controller default suspend-resume seems only save/restore the
> NVMe link state by APST opt and the NVMe remains in D0 during this time.
> Then the NVMe device will be shutdown by SMU firmware in the s2idle entry
> and then will lost the NVMe power context during s2idle resume.Finally, the
> NVMe command queue request will be processed abnormally and result in
> access timeout.This issue can be settled by using PCIe power set with simple
> suspend-resume process path instead of APST get/set opt.
>
> This patch is updating the nvme_acpi_storage_d3() with previously added
> quirk.
>
> Cc: <stable@vger.kernel.org> # 5.10+
> Signed-off-by: Prike Liang <Prike.Liang@amd.com>
> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
> [ck: split patches for nvme and pcie]
> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
> Suggested-by: Keith Busch <kbusch@kernel.org>
> Acked-by: Keith Busch <kbusch@kernel.org>
> ---
> Changes in v2:
> Fix the patch format and check chip root complex DID instead of PCIe RP to
> avoid the storage device plugged in internal PCIe RP by USB adaptor.
>
> Changes in v3:
> According to Christoph Hellwig do NVME PCIe related identify opt better in
> PCIe quirk driver rather than in NVME module.
>
> Changes in v4:
> Split the fix to PCIe and NVMe part and then call the pci_dev_put() put the
> device reference count and finally refine the commit info.
>
> Changes in v5:
> According to Christoph Hellwig and Keith Busch better use a passthrough
> device(bus) gloable flag to identify the NVMe shutdown opt rather than look
> up the device BDF.
> ---
>  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
> 6bad4d4..617256e 100644
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -2836,6 +2836,8 @@ static bool nvme_acpi_storage_d3(struct pci_dev
> *dev)
>  acpi_status status;
>  u8 val;
>
> +if (dev->bus->bus_flags & PCI_BUS_FLAGS_DISABLE_ON_S2I)
> +return true;
>  /*
>   * Look for _DSD property specifying that the storage device on the
> port
>   * must use D3 to support deep platform power savings during
> --
> 2.7.4

RE: [PATCH v5 2/2] nvme-pci: add AMD PCIe quirk for simple suspend/resume

[Liang, Prike]

[AMD Public Use]

+ linux-pci for further review.

Thanks,
> -----Original Message-----
> From: Liang, Prike <Prike.Liang@amd.com>
> Sent: Thursday, April 22, 2021 9:19 AM
> To: linux-nvme@lists.infradead.org; kbusch@kernel.org; hch@infradead.org;
> Chaitanya.Kulkarni@wdc.com; gregkh@linuxfoundation.org
> Cc: stable@vger.kernel.org; Deucher, Alexander
> <Alexander.Deucher@amd.com>; S-k, Shyam-sundar <Shyam-sundar.S-
> k@amd.com>; Liang, Prike <Prike.Liang@amd.com>; Chaitanya Kulkarni
> <chaitanya.kulkarni@wdc.com>
> Subject: [PATCH v5 2/2] nvme-pci: add AMD PCIe quirk for simple
> suspend/resume
>
> In the NVMe controller default suspend-resume seems only save/restore the
> NVMe link state by APST opt and the NVMe remains in D0 during this time.
> Then the NVMe device will be shutdown by SMU firmware in the s2idle entry
> and then will lost the NVMe power context during s2idle resume.Finally, the
> NVMe command queue request will be processed abnormally and result in
> access timeout.This issue can be settled by using PCIe power set with simple
> suspend-resume process path instead of APST get/set opt.
>
> This patch is updating the nvme_acpi_storage_d3() with previously added
> quirk.
>
> Cc: <stable@vger.kernel.org> # 5.10+
> Signed-off-by: Prike Liang <Prike.Liang@amd.com>
> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
> [ck: split patches for nvme and pcie]
> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
> Suggested-by: Keith Busch <kbusch@kernel.org>
> Acked-by: Keith Busch <kbusch@kernel.org>
> ---
> Changes in v2:
> Fix the patch format and check chip root complex DID instead of PCIe RP to
> avoid the storage device plugged in internal PCIe RP by USB adaptor.
>
> Changes in v3:
> According to Christoph Hellwig do NVME PCIe related identify opt better in
> PCIe quirk driver rather than in NVME module.
>
> Changes in v4:
> Split the fix to PCIe and NVMe part and then call the pci_dev_put() put the
> device reference count and finally refine the commit info.
>
> Changes in v5:
> According to Christoph Hellwig and Keith Busch better use a passthrough
> device(bus) gloable flag to identify the NVMe shutdown opt rather than look
> up the device BDF.
> ---
>  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
> 6bad4d4..617256e 100644
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -2836,6 +2836,8 @@ static bool nvme_acpi_storage_d3(struct pci_dev
> *dev)
>  acpi_status status;
>  u8 val;
>
> +if (dev->bus->bus_flags & PCI_BUS_FLAGS_DISABLE_ON_S2I)
> +return true;
>  /*
>   * Look for _DSD property specifying that the storage device on the
> port
>   * must use D3 to support deep platform power savings during
> --
> 2.7.4


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http://lists.infradead.org/mailman/listinfo/linux-nvme

[PATCH v5 0/2] nvme-pci: add AMD PCIe quirk for NVMe simple suspend/resume

[Prike Liang]

Those patch series can handle NVMe can't suspend to D3 during s2idle
entry on some AMD platform. In this case, can be settld by assigning and
passing a PCIe bus flag to the armed device which need NVMe shutdown opt
in s2idle suspend and then use PCIe power setting to put the NVMe device
to D3.

Prike Liang (2):
  PCI: add AMD PCIe quirk for nvme shutdown opt
  nvme-pci: add AMD PCIe quirk for simple suspend/resume

 drivers/nvme/host/pci.c | 2 ++
 drivers/pci/probe.c     | 5 ++++-
 drivers/pci/quirks.c    | 7 +++++++
 include/linux/pci.h     | 2 ++
 4 files changed, 15 insertions(+), 1 deletion(-)

-- 
2.7.4

[PATCH v5 0/2] nvme-pci: add AMD PCIe quirk for NVMe simple suspend/resume

[Prike Liang]

Those patch series can handle NVMe can't suspend to D3 during s2idle
entry on some AMD platform. In this case, can be settld by assigning and
passing a PCIe bus flag to the armed device which need NVMe shutdown opt
in s2idle suspend and then use PCIe power setting to put the NVMe device
to D3.

Prike Liang (2):
  PCI: add AMD PCIe quirk for nvme shutdown opt
  nvme-pci: add AMD PCIe quirk for simple suspend/resume

 drivers/nvme/host/pci.c | 2 ++
 drivers/pci/probe.c     | 5 ++++-
 drivers/pci/quirks.c    | 7 +++++++
 include/linux/pci.h     | 2 ++
 4 files changed, 15 insertions(+), 1 deletion(-)

-- 
2.7.4


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Re: [PATCH v5 0/2] nvme-pci: add AMD PCIe quirk for NVMe simple suspend/resume

[Christoph Hellwig]

This looks ok to me now.

As a note to the people in AMD who came up with this scheme:  having
to shut down the controller every time s2i is entered not only generally
uses more power than using power states, but also means every time
s2i is entered the SSD needs to write to the media, which causes massive
endurance shortfalls.

On Tue, May 18, 2021 at 10:24:33AM +0800, Prike Liang wrote:
> Those patch series can handle NVMe can't suspend to D3 during s2idle
> entry on some AMD platform. In this case, can be settld by assigning and
> passing a PCIe bus flag to the armed device which need NVMe shutdown opt
> in s2idle suspend and then use PCIe power setting to put the NVMe device
> to D3.
> 
> Prike Liang (2):
>   PCI: add AMD PCIe quirk for nvme shutdown opt
>   nvme-pci: add AMD PCIe quirk for simple suspend/resume
> 
>  drivers/nvme/host/pci.c | 2 ++
>  drivers/pci/probe.c     | 5 ++++-
>  drivers/pci/quirks.c    | 7 +++++++
>  include/linux/pci.h     | 2 ++
>  4 files changed, 15 insertions(+), 1 deletion(-)
> 
> -- 
> 2.7.4
---end quoted text---

Re: [PATCH v5 0/2] nvme-pci: add AMD PCIe quirk for NVMe simple suspend/resume

[Christoph Hellwig]

This looks ok to me now.

As a note to the people in AMD who came up with this scheme:  having
to shut down the controller every time s2i is entered not only generally
uses more power than using power states, but also means every time
s2i is entered the SSD needs to write to the media, which causes massive
endurance shortfalls.

On Tue, May 18, 2021 at 10:24:33AM +0800, Prike Liang wrote:
> Those patch series can handle NVMe can't suspend to D3 during s2idle
> entry on some AMD platform. In this case, can be settld by assigning and
> passing a PCIe bus flag to the armed device which need NVMe shutdown opt
> in s2idle suspend and then use PCIe power setting to put the NVMe device
> to D3.
> 
> Prike Liang (2):
>   PCI: add AMD PCIe quirk for nvme shutdown opt
>   nvme-pci: add AMD PCIe quirk for simple suspend/resume
> 
>  drivers/nvme/host/pci.c | 2 ++
>  drivers/pci/probe.c     | 5 ++++-
>  drivers/pci/quirks.c    | 7 +++++++
>  include/linux/pci.h     | 2 ++
>  4 files changed, 15 insertions(+), 1 deletion(-)
> 
> -- 
> 2.7.4
---end quoted text---

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[PATCH v5 0/2] nvme-pci: add AMD PCIe quirk for NVMe simple suspend/resume

[Prike Liang]

Those patch series can handle NVMe can't suspend to D3 during s2idle
entry on some AMD platform. In this case, can be settld by assigning and
passing a PCIe bus flag to the armed device which need NVMe shutdown opt
in s2idle suspend and then use PCIe power setting to put the NVMe device
to D3.

Prike Liang (2):
  PCI: add AMD PCIe quirk for nvme shutdown opt
  nvme-pci: add AMD PCIe quirk for simple suspend/resume

 drivers/nvme/host/pci.c | 2 ++
 drivers/pci/probe.c     | 5 ++++-
 drivers/pci/quirks.c    | 7 +++++++
 include/linux/pci.h     | 2 ++
 4 files changed, 15 insertions(+), 1 deletion(-)

-- 
2.7.4

[PATCH v5 0/2] nvme-pci: add AMD PCIe quirk for NVMe simple suspend/resume

[Prike Liang]

Those patch series can handle NVMe can't suspend to D3 during s2idle
entry on some AMD platform. In this case, can be settld by assigning and
passing a PCIe bus flag to the armed device which need NVMe shutdown opt
in s2idle suspend and then use PCIe power setting to put the NVMe device
to D3.

Prike Liang (2):
  PCI: add AMD PCIe quirk for nvme shutdown opt
  nvme-pci: add AMD PCIe quirk for simple suspend/resume

 drivers/nvme/host/pci.c | 2 ++
 drivers/pci/probe.c     | 5 ++++-
 drivers/pci/quirks.c    | 7 +++++++
 include/linux/pci.h     | 2 ++
 4 files changed, 15 insertions(+), 1 deletion(-)

-- 
2.7.4


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