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Groups > linux.kernel > #1428024 > unrolled thread

[PATCH] pci: Add support for unbinding the generic PCI host controller

Started byJan Kiszka <jan.kiszka@siemens.com>
First post2016-06-21 20:10 +0200
Last post2016-06-22 08:30 +0200
Articles 2 — 2 participants

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  [PATCH] pci: Add support for unbinding the generic PCI host  controller Jan Kiszka <jan.kiszka@siemens.com> - 2016-06-21 20:10 +0200
    Re: [PATCH] pci: Add support for unbinding the generic PCI host  controller Will Deacon <will.deacon@arm.com> - 2016-06-22 08:30 +0200

#1428024 — [PATCH] pci: Add support for unbinding the generic PCI host controller

FromJan Kiszka <jan.kiszka@siemens.com>
Date2016-06-21 20:10 +0200
Subject[PATCH] pci: Add support for unbinding the generic PCI host controller
Message-ID<rMyhz-Qq-1@gated-at.bofh.it>
Particularly useful when working in virtual environments where the
controller may come and go, but possibly not only there.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 drivers/pci/ecam.h                  |  1 +
 drivers/pci/host/pci-host-common.c  | 13 +++++++++++++
 drivers/pci/host/pci-host-generic.c |  1 +
 3 files changed, 15 insertions(+)

diff --git a/drivers/pci/ecam.h b/drivers/pci/ecam.h
index 9878beb..5a5f607 100644
--- a/drivers/pci/ecam.h
+++ b/drivers/pci/ecam.h
@@ -63,5 +63,6 @@ extern struct pci_ecam_ops pci_generic_ecam_ops;
 /* for DT-based PCI controllers that support ECAM */
 int pci_host_common_probe(struct platform_device *pdev,
 			  struct pci_ecam_ops *ops);
+int pci_host_common_remove(struct platform_device *pdev);
 #endif
 #endif
diff --git a/drivers/pci/host/pci-host-common.c b/drivers/pci/host/pci-host-common.c
index 8cba7ab..c0ff4b1 100644
--- a/drivers/pci/host/pci-host-common.c
+++ b/drivers/pci/host/pci-host-common.c
@@ -164,6 +164,19 @@ int pci_host_common_probe(struct platform_device *pdev,
 	}
 
 	pci_bus_add_devices(bus);
+	platform_set_drvdata(pdev, bus);
+	return 0;
+}
+
+int pci_host_common_remove(struct platform_device *pdev)
+{
+	struct pci_bus *bus = platform_get_drvdata(pdev);
+
+	pci_lock_rescan_remove();
+	pci_stop_root_bus(bus);
+	pci_remove_root_bus(bus);
+	pci_unlock_rescan_remove();
+
 	return 0;
 }
 
diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
index 6eaceab..0a2e75b 100644
--- a/drivers/pci/host/pci-host-generic.c
+++ b/drivers/pci/host/pci-host-generic.c
@@ -65,6 +65,7 @@ static struct platform_driver gen_pci_driver = {
 		.of_match_table = gen_pci_of_match,
 	},
 	.probe = gen_pci_probe,
+	.remove = pci_host_common_remove,
 };
 module_platform_driver(gen_pci_driver);
 
-- 
2.1.4

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#1428455

FromWill Deacon <will.deacon@arm.com>
Date2016-06-22 08:30 +0200
Message-ID<rMJPH-8fv-7@gated-at.bofh.it>
In reply to#1428024
Hi Jan,

On Tue, Jun 21, 2016 at 08:07:50PM +0200, Jan Kiszka wrote:
> Particularly useful when working in virtual environments where the
> controller may come and go, but possibly not only there.
> 
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> ---
>  drivers/pci/ecam.h                  |  1 +
>  drivers/pci/host/pci-host-common.c  | 13 +++++++++++++
>  drivers/pci/host/pci-host-generic.c |  1 +
>  3 files changed, 15 insertions(+)
> 
> diff --git a/drivers/pci/ecam.h b/drivers/pci/ecam.h
> index 9878beb..5a5f607 100644
> --- a/drivers/pci/ecam.h
> +++ b/drivers/pci/ecam.h
> @@ -63,5 +63,6 @@ extern struct pci_ecam_ops pci_generic_ecam_ops;
>  /* for DT-based PCI controllers that support ECAM */
>  int pci_host_common_probe(struct platform_device *pdev,
>  			  struct pci_ecam_ops *ops);
> +int pci_host_common_remove(struct platform_device *pdev);
>  #endif
>  #endif
> diff --git a/drivers/pci/host/pci-host-common.c b/drivers/pci/host/pci-host-common.c
> index 8cba7ab..c0ff4b1 100644
> --- a/drivers/pci/host/pci-host-common.c
> +++ b/drivers/pci/host/pci-host-common.c
> @@ -164,6 +164,19 @@ int pci_host_common_probe(struct platform_device *pdev,
>  	}
>  
>  	pci_bus_add_devices(bus);
> +	platform_set_drvdata(pdev, bus);
> +	return 0;
> +}
> +
> +int pci_host_common_remove(struct platform_device *pdev)
> +{
> +	struct pci_bus *bus = platform_get_drvdata(pdev);
> +
> +	pci_lock_rescan_remove();
> +	pci_stop_root_bus(bus);
> +	pci_remove_root_bus(bus);
> +	pci_unlock_rescan_remove();

A couple of comments/questions about this:

  - The probe path seems to have some stateful operations outside of PCI
    resources. For example, kzalloc'ing the bus_range resource in
    of_pci_get_host_bridge_resources. Do we need to clean these up
    explicitly?

  - Similarly, we don't seem to tear-down the config space mappings and
    data structures for that, so we leak VA space afaict.

Will

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