On Tue, Sep 13, 2016 at 09:05:40AM -0600, Keith Busch wrote:
> This patch adds a new function to set PCI domain specific options as
> devices are added. The usage included in this patch is for LED indicator
> control in VMD domains, but may be extended in the future as new domain
> specific options are required.
>
> PCIe LED Slot Control in a VMD domain is repurposed to a non-standard
> implementation. As such, all devices in a VMD domain will be flagged so
> pciehp does not attempt to use LED indicators. This user_led flag
> has pciehp provide a different sysfs entry for user exclusive control
> over the domain's slot indicators.
>
> In order to determine if a bus is within a PCI domain, the patch appends
> a bool to the pci_sysdata structure that the VMD driver sets during
> initialization.
>
> Requested-by: Kapil Karkra <kapil.karkra@xxxxxxxxx>
> Tested-by: Artur Paszkiewicz <artur.paszkiewicz@xxxxxxxxx>
> Signed-off-by: Keith Busch <keith.busch@xxxxxxxxx>
Applied on pci/hotplug for v4.9, thanks!
I made the necessary changes to match the renaming I did in the first
patch, and I also used plain old "#ifdef" instead of "#if IS_ENABLED"
since the rest of the file uses the former style. If there's a reason
to switch, we should change the whole file in a separate patch so we
can explain the rationale.
Please check it out and make sure everything you need made it in.
> ---
>
> No change from previous version of this patch; just part of the series.
>
> arch/x86/include/asm/pci.h | 14 ++++++++++++++
> arch/x86/pci/common.c | 7 +++++++
> arch/x86/pci/vmd.c | 1 +
> 3 files changed, 22 insertions(+)
>
> diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
> index 9ab7507..1411dbe 100644
> --- a/arch/x86/include/asm/pci.h
> +++ b/arch/x86/include/asm/pci.h
> @@ -23,6 +23,9 @@ struct pci_sysdata {
> #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> void *fwnode; /* IRQ domain for MSI assignment */
> #endif
> +#if IS_ENABLED(CONFIG_VMD)
> + bool vmd_domain; /* True if in Intel VMD domain */
> +#endif
> };
>
> extern int pci_routeirq;
> @@ -56,6 +59,17 @@ static inline void *_pci_root_bus_fwnode(struct pci_bus *bus)
> #define pci_root_bus_fwnode _pci_root_bus_fwnode
> #endif
>
> +static inline bool is_vmd(struct pci_bus *bus)
> +{
> +#if IS_ENABLED(CONFIG_VMD)
> + struct pci_sysdata *sd = bus->sysdata;
> +
> + return sd->vmd_domain;
> +#else
> + return false;
> +#endif
> +}
> +
> /* Can be used to override the logic in pci_scan_bus for skipping
> already-configured bus numbers - to be used for buggy BIOSes
> or architectures with incomplete PCI setup by the loader */
> diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
> index 7b6a9d1..ccf696c 100644
> --- a/arch/x86/pci/common.c
> +++ b/arch/x86/pci/common.c
> @@ -677,6 +677,12 @@ static void set_dma_domain_ops(struct pci_dev *pdev)
> static void set_dma_domain_ops(struct pci_dev *pdev) {}
> #endif
>
> +static void set_dev_domain_options(struct pci_dev *pdev)
> +{
> + if (is_vmd(pdev->bus))
> + pdev->user_leds = 1;
> +}
> +
> int pcibios_add_device(struct pci_dev *dev)
> {
> struct setup_data *data;
> @@ -707,6 +713,7 @@ int pcibios_add_device(struct pci_dev *dev)
> iounmap(data);
> }
> set_dma_domain_ops(dev);
> + set_dev_domain_options(dev);
> return 0;
> }
>
> diff --git a/arch/x86/pci/vmd.c b/arch/x86/pci/vmd.c
> index b814ca6..a021b7b 100644
> --- a/arch/x86/pci/vmd.c
> +++ b/arch/x86/pci/vmd.c
> @@ -596,6 +596,7 @@ static int vmd_enable_domain(struct vmd_dev *vmd)
> .parent = res,
> };
>
> + sd->vmd_domain = true;
> sd->domain = vmd_find_free_domain();
> if (sd->domain < 0)
> return sd->domain;
> --
> 2.7.2
>
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