linux-kernel - Re: [Patch Part3 V4 21/21] pci, ACPI, iommu: Enhance pci

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Message-ID: <CAErSpo5MU2tck3iQxf0K0rMzNuHdFMLDF+frqQ-5f-KPGcobqg@mail.gmail.com>
Date:	Wed, 16 Jul 2014 12:48:33 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Joerg Roedel <joro@...tes.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>, Ashok Raj <ashok.raj@...el.com>,
	Yijing Wang <wangyijing@...wei.com>,
	Tony Luck <tony.luck@...el.com>,
	"open list:INTEL IOMMU (VT-d)" <iommu@...ts.linux-foundation.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	linux hotplug mailing <linux-hotplug@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	dmaengine@...r.kernel.org,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [Patch Part3 V4 21/21] pci, ACPI, iommu: Enhance pci_root to
 support DMAR device hotplug

On Fri, Jul 11, 2014 at 12:19 AM, Jiang Liu <jiang.liu@...ux.intel.com> wrote:
> Finally enhance pci_root driver to support DMAR device hotplug when
> hot-plugging PCI host bridges.
>
> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

I assume you'll merge this along with the rest of the series via some
non-PCI tree.

> ---
>  drivers/acpi/pci_root.c |   16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> index d388f13d48b4..99c2b9761c12 100644
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -33,6 +33,7 @@
>  #include <linux/pci.h>
>  #include <linux/pci-acpi.h>
>  #include <linux/pci-aspm.h>
> +#include <linux/dmar.h>
>  #include <linux/acpi.h>
>  #include <linux/slab.h>
>  #include <acpi/apei.h> /* for acpi_hest_init() */
> @@ -511,6 +512,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
>         struct acpi_pci_root *root;
>         acpi_handle handle = device->handle;
>         int no_aspm = 0, clear_aspm = 0;
> +       bool hotadd = system_state != SYSTEM_BOOTING;
>
>         root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
>         if (!root)
> @@ -557,6 +559,11 @@ static int acpi_pci_root_add(struct acpi_device *device,
>         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
>         device->driver_data = root;
>
> +       if (hotadd && dmar_device_add(handle)) {
> +               result = -ENXIO;
> +               goto end;
> +       }
> +
>         pr_info(PREFIX "%s [%s] (domain %04x %pR)\n",
>                acpi_device_name(device), acpi_device_bid(device),
>                root->segment, &root->secondary);
> @@ -583,7 +590,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
>                         root->segment, (unsigned int)root->secondary.start);
>                 device->driver_data = NULL;
>                 result = -ENODEV;
> -               goto end;
> +               goto remove_dmar;
>         }
>
>         if (clear_aspm) {
> @@ -597,7 +604,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
>         if (device->wakeup.flags.run_wake)
>                 device_set_run_wake(root->bus->bridge, true);
>
> -       if (system_state != SYSTEM_BOOTING) {
> +       if (hotadd) {
>                 pcibios_resource_survey_bus(root->bus);
>                 pci_assign_unassigned_root_bus_resources(root->bus);
>         }
> @@ -607,6 +614,9 @@ static int acpi_pci_root_add(struct acpi_device *device,
>         pci_unlock_rescan_remove();
>         return 1;
>
> +remove_dmar:
> +       if (hotadd)
> +               dmar_device_remove(handle);
>  end:
>         kfree(root);
>         return result;
> @@ -625,6 +635,8 @@ static void acpi_pci_root_remove(struct acpi_device *device)
>
>         pci_remove_root_bus(root->bus);
>
> +       dmar_device_remove(device->handle);
> +
>         pci_unlock_rescan_remove();
>
>         kfree(root);
> --
> 1.7.10.4
>
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