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* [PATCH] PCI: hv: Fix a timing issue which causes kdump to fail occasionally
@ 2020-07-16 15:51 Wei Hu
  2020-07-16 16:22 ` Michael Kelley
  0 siblings, 1 reply; 2+ messages in thread
From: Wei Hu @ 2020-07-16 15:51 UTC (permalink / raw)
  To: kys, haiyangz, sthemmin, wei.liu, lorenzo.pieralisi, robh,
	bhelgaas, linux-hyperv, linux-pci, linux-kernel, decui, mikelley
  Cc: Wei Hu

Kdump could fail sometime on HyperV guest over Accerlated Network
interface. This is because the retry in hv_pci_enter_d0() relies on
an asynchronous host event to arrive guest before calling
hv_send_resources_allocated(). This fixes the problem by moving retry
to hv_pci_probe(), removing this dependence and making the calling
sequence synchronous.

Signed-off-by: Wei Hu <weh@microsoft.com>
---
 drivers/pci/controller/pci-hyperv.c | 66 ++++++++++++++---------------
 1 file changed, 32 insertions(+), 34 deletions(-)

diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index bf40ff09c99d..738ee30f3334 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -2759,10 +2759,8 @@ static int hv_pci_enter_d0(struct hv_device *hdev)
 	struct pci_bus_d0_entry *d0_entry;
 	struct hv_pci_compl comp_pkt;
 	struct pci_packet *pkt;
-	bool retry = true;
 	int ret;
 
-enter_d0_retry:
 	/*
 	 * Tell the host that the bus is ready to use, and moved into the
 	 * powered-on state.  This includes telling the host which region
@@ -2789,38 +2787,6 @@ static int hv_pci_enter_d0(struct hv_device *hdev)
 	if (ret)
 		goto exit;
 
-	/*
-	 * In certain case (Kdump) the pci device of interest was
-	 * not cleanly shut down and resource is still held on host
-	 * side, the host could return invalid device status.
-	 * We need to explicitly request host to release the resource
-	 * and try to enter D0 again.
-	 */
-	if (comp_pkt.completion_status < 0 && retry) {
-		retry = false;
-
-		dev_err(&hdev->device, "Retrying D0 Entry\n");
-
-		/*
-		 * Hv_pci_bus_exit() calls hv_send_resource_released()
-		 * to free up resources of its child devices.
-		 * In the kdump kernel we need to set the
-		 * wslot_res_allocated to 255 so it scans all child
-		 * devices to release resources allocated in the
-		 * normal kernel before panic happened.
-		 */
-		hbus->wslot_res_allocated = 255;
-
-		ret = hv_pci_bus_exit(hdev, true);
-
-		if (ret == 0) {
-			kfree(pkt);
-			goto enter_d0_retry;
-		}
-		dev_err(&hdev->device,
-			"Retrying D0 failed with ret %d\n", ret);
-	}
-
 	if (comp_pkt.completion_status < 0) {
 		dev_err(&hdev->device,
 			"PCI Pass-through VSP failed D0 Entry with status %x\n",
@@ -3058,6 +3024,7 @@ static int hv_pci_probe(struct hv_device *hdev,
 	struct hv_pcibus_device *hbus;
 	u16 dom_req, dom;
 	char *name;
+	bool enter_d0_retry = true;
 	int ret;
 
 	/*
@@ -3178,11 +3145,42 @@ static int hv_pci_probe(struct hv_device *hdev,
 	if (ret)
 		goto free_fwnode;
 
+retry:
 	ret = hv_pci_query_relations(hdev);
 	if (ret)
 		goto free_irq_domain;
 
 	ret = hv_pci_enter_d0(hdev);
+	/*
+	 * In certain case (Kdump) the pci device of interest was
+	 * not cleanly shut down and resource is still held on host
+	 * side, the host could return invalid device status.
+	 * We need to explicitly request host to release the resource
+	 * and try to enter D0 again.
+	 * The retry should start from hv_pci_query_relations() call.
+	 */
+	if (ret == -EPROTO && enter_d0_retry) {
+		enter_d0_retry = false;
+
+		dev_err(&hdev->device, "Retrying D0 Entry\n");
+
+		/*
+		 * Hv_pci_bus_exit() calls hv_send_resources_released()
+		 * to free up resources of its child devices.
+		 * In the kdump kernel we need to set the
+		 * wslot_res_allocated to 255 so it scans all child
+		 * devices to release resources allocated in the
+		 * normal kernel before panic happened.
+		 */
+		hbus->wslot_res_allocated = 255;
+		ret = hv_pci_bus_exit(hdev, true);
+
+		if (ret == 0)
+			goto retry;
+
+		dev_err(&hdev->device,
+			"Retrying D0 failed with ret %d\n", ret);
+	}
 	if (ret)
 		goto free_irq_domain;
 
-- 
2.20.1


^ permalink raw reply	[flat|nested] 2+ messages in thread

* RE: [PATCH] PCI: hv: Fix a timing issue which causes kdump to fail occasionally
  2020-07-16 15:51 [PATCH] PCI: hv: Fix a timing issue which causes kdump to fail occasionally Wei Hu
@ 2020-07-16 16:22 ` Michael Kelley
  0 siblings, 0 replies; 2+ messages in thread
From: Michael Kelley @ 2020-07-16 16:22 UTC (permalink / raw)
  To: Wei Hu, KY Srinivasan, Haiyang Zhang, Stephen Hemminger, wei.liu,
	lorenzo.pieralisi, robh, bhelgaas, linux-hyperv, linux-pci,
	linux-kernel, Dexuan Cui

From: Wei Hu <weh@microsoft.com> Sent: Thursday, July 16, 2020 8:51 AM
> 
> Kdump could fail sometime on HyperV guest over Accerlated Network
> interface. This is because the retry in hv_pci_enter_d0() relies on
> an asynchronous host event to arrive guest before calling
> hv_send_resources_allocated(). This fixes the problem by moving retry
> to hv_pci_probe(), removing this dependence and making the calling
> sequence synchronous.
> 
> Signed-off-by: Wei Hu <weh@microsoft.com>

I'd suggest adding a "Fixes:" tag referencing commit c81992e7f4aa.

Otherwise,

Reviewed-by: Michael Kelley <mikelley@microsoft.com>

> ---
>  drivers/pci/controller/pci-hyperv.c | 66 ++++++++++++++---------------
>  1 file changed, 32 insertions(+), 34 deletions(-)
> 
> diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
> index bf40ff09c99d..738ee30f3334 100644
> --- a/drivers/pci/controller/pci-hyperv.c
> +++ b/drivers/pci/controller/pci-hyperv.c
> @@ -2759,10 +2759,8 @@ static int hv_pci_enter_d0(struct hv_device *hdev)
>  	struct pci_bus_d0_entry *d0_entry;
>  	struct hv_pci_compl comp_pkt;
>  	struct pci_packet *pkt;
> -	bool retry = true;
>  	int ret;
> 
> -enter_d0_retry:
>  	/*
>  	 * Tell the host that the bus is ready to use, and moved into the
>  	 * powered-on state.  This includes telling the host which region
> @@ -2789,38 +2787,6 @@ static int hv_pci_enter_d0(struct hv_device *hdev)
>  	if (ret)
>  		goto exit;
> 
> -	/*
> -	 * In certain case (Kdump) the pci device of interest was
> -	 * not cleanly shut down and resource is still held on host
> -	 * side, the host could return invalid device status.
> -	 * We need to explicitly request host to release the resource
> -	 * and try to enter D0 again.
> -	 */
> -	if (comp_pkt.completion_status < 0 && retry) {
> -		retry = false;
> -
> -		dev_err(&hdev->device, "Retrying D0 Entry\n");
> -
> -		/*
> -		 * Hv_pci_bus_exit() calls hv_send_resource_released()
> -		 * to free up resources of its child devices.
> -		 * In the kdump kernel we need to set the
> -		 * wslot_res_allocated to 255 so it scans all child
> -		 * devices to release resources allocated in the
> -		 * normal kernel before panic happened.
> -		 */
> -		hbus->wslot_res_allocated = 255;
> -
> -		ret = hv_pci_bus_exit(hdev, true);
> -
> -		if (ret == 0) {
> -			kfree(pkt);
> -			goto enter_d0_retry;
> -		}
> -		dev_err(&hdev->device,
> -			"Retrying D0 failed with ret %d\n", ret);
> -	}
> -
>  	if (comp_pkt.completion_status < 0) {
>  		dev_err(&hdev->device,
>  			"PCI Pass-through VSP failed D0 Entry with status %x\n",
> @@ -3058,6 +3024,7 @@ static int hv_pci_probe(struct hv_device *hdev,
>  	struct hv_pcibus_device *hbus;
>  	u16 dom_req, dom;
>  	char *name;
> +	bool enter_d0_retry = true;
>  	int ret;
> 
>  	/*
> @@ -3178,11 +3145,42 @@ static int hv_pci_probe(struct hv_device *hdev,
>  	if (ret)
>  		goto free_fwnode;
> 
> +retry:
>  	ret = hv_pci_query_relations(hdev);
>  	if (ret)
>  		goto free_irq_domain;
> 
>  	ret = hv_pci_enter_d0(hdev);
> +	/*
> +	 * In certain case (Kdump) the pci device of interest was
> +	 * not cleanly shut down and resource is still held on host
> +	 * side, the host could return invalid device status.
> +	 * We need to explicitly request host to release the resource
> +	 * and try to enter D0 again.
> +	 * The retry should start from hv_pci_query_relations() call.
> +	 */
> +	if (ret == -EPROTO && enter_d0_retry) {
> +		enter_d0_retry = false;
> +
> +		dev_err(&hdev->device, "Retrying D0 Entry\n");
> +
> +		/*
> +		 * Hv_pci_bus_exit() calls hv_send_resources_released()
> +		 * to free up resources of its child devices.
> +		 * In the kdump kernel we need to set the
> +		 * wslot_res_allocated to 255 so it scans all child
> +		 * devices to release resources allocated in the
> +		 * normal kernel before panic happened.
> +		 */
> +		hbus->wslot_res_allocated = 255;
> +		ret = hv_pci_bus_exit(hdev, true);
> +
> +		if (ret == 0)
> +			goto retry;
> +
> +		dev_err(&hdev->device,
> +			"Retrying D0 failed with ret %d\n", ret);
> +	}
>  	if (ret)
>  		goto free_irq_domain;
> 
> --
> 2.20.1


^ permalink raw reply	[flat|nested] 2+ messages in thread

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2020-07-16 15:51 [PATCH] PCI: hv: Fix a timing issue which causes kdump to fail occasionally Wei Hu
2020-07-16 16:22 ` Michael Kelley

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