[PATCH 0/2] Few NVME fixes

[PATCH 0/2] Few NVME fixes

[Maxim Levitsky]

Hi,

I am sending here two fixes for bugs I found during develpment of nvme-mdev
driver.
Patches are based on http://git.infradead.org/nvme.git nvme-5.2


Best regards,
	Maxim Levitsky


Maxim Levitsky (2):
  nvme/pci: init shadow doorbell after each reset
  nvme/pci: add known admin effects to augument admin effects log page

 drivers/nvme/host/core.c | 4 ++--
 drivers/nvme/host/pci.c  | 3 +--
 2 files changed, 3 insertions(+), 4 deletions(-)

-- 
2.17.2

[PATCH 1/2] nvme/pci: init shadow doorbell after each reset

[Maxim Levitsky]

The spec states
"The settings are not retained across a Controller Level Reset"
Therefore the driver must enable the shadow doorbell,
after each reset.

This was caught while testing the nvme driver over
upcoming nvme-mdev device

Signed-off-by: Maxim Levitsky <mlevitsk at redhat.com>
---
 drivers/nvme/host/pci.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 1f468a16efad..1c844c66ecaa 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2303,8 +2303,6 @@ static int nvme_dev_add(struct nvme_dev *dev)
 			return ret;
 		}
 		dev->ctrl.tagset = &dev->tagset;
-
-		nvme_dbbuf_set(dev);
 	} else {
 		blk_mq_update_nr_hw_queues(&dev->tagset, dev->online_queues - 1);
 
@@ -2312,6 +2310,7 @@ static int nvme_dev_add(struct nvme_dev *dev)
 		nvme_free_queues(dev, dev->online_queues);
 	}
 
+	nvme_dbbuf_set(dev);
 	return 0;
 }
 
-- 
2.17.2

[PATCH 2/2] nvme/pci: add known admin effects to augument admin effects log page

[Maxim Levitsky]

Add known admin effects even if hardware has known admin effects page,
since hardware can't be ever trusted to report sane values.
(on my Intel DC P3700, it reports no side effects for namespace format)

Signed-off-by: Maxim Levitsky <mlevitsk at redhat.com>
---
 drivers/nvme/host/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 3dd043aa6d1f..2e11d014d514 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1259,8 +1259,8 @@ static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 
 	if (ctrl->effects)
 		effects = le32_to_cpu(ctrl->effects->acs[opcode]);
-	else
-		effects = nvme_known_admin_effects(opcode);
+
+	effects |= nvme_known_admin_effects(opcode);
 
 	/*
 	 * For simplicity, IO to all namespaces is quiesced even if the command
-- 
2.17.2

[PATCH 1/2] nvme/pci: init shadow doorbell after each reset

[Keith Busch]

On Thu, May 02, 2019@02:31:33PM +0300, Maxim Levitsky wrote:
> @@ -2303,8 +2303,6 @@ static int nvme_dev_add(struct nvme_dev *dev)
>  			return ret;
>  		}
>  		dev->ctrl.tagset = &dev->tagset;
> -
> -		nvme_dbbuf_set(dev);
>  	} else {
>  		blk_mq_update_nr_hw_queues(&dev->tagset, dev->online_queues - 1);
>  
> @@ -2312,6 +2310,7 @@ static int nvme_dev_add(struct nvme_dev *dev)
>  		nvme_free_queues(dev, dev->online_queues);
>  	}
>  
> +	nvme_dbbuf_set(dev);
>  	return 0;
>  }

Looks good.

Reviewed-by: Keith Busch <keith.busch at intel.com>

[PATCH 1/2] nvme/pci: init shadow doorbell after each reset

[Minwoo Im]

> -----Original Message-----
> From: Linux-nvme [mailto:linux-nvme-bounces at lists.infradead.org] On
> Behalf Of Maxim Levitsky
> Sent: Thursday, May 02, 2019 8:32 PM
> To: linux-nvme at lists.infradead.org
> Subject: [PATCH 1/2] nvme/pci: init shadow doorbell after each reset
> 
> The spec states
> "The settings are not retained across a Controller Level Reset"
> Therefore the driver must enable the shadow doorbell,
> after each reset.
> 
> This was caught while testing the nvme driver over
> upcoming nvme-mdev device
> 
> Signed-off-by: Maxim Levitsky <mlevitsk at redhat.com>

It looks good to me.

Reviewed-by: Minwoo Im <minwoo.im at samsung.com>

[PATCH 0/2] Few NVME fixes

[Christoph Hellwig]

Thanks,

applied both patches to nvme-5.2.