Commit 3161832d authored by Keith Busch's avatar Keith Busch Committed by Bjorn Helgaas
Browse files

x86/PCI: VMD: Request userspace control of PCIe hotplug indicators 



Add set_dev_domain_options() to set PCI domain-specific options as devices
are added.  The first usage is to request exclusive userspace control of
PCIe hotplug indicators in VMD domains.

Devices in a VMD domain use PCIe hotplug Attention and Power Indicators in
a non-standard way; tell pciehp to ignore the indicators so userspace can
control them via the sysfs "attention" file.

To determine whether a bus is within a VMD domain, add a bool to the
pci_sysdata structure that the VMD driver sets during initialization.

[bhelgaas: changelog]
Requested-by: default avatarKapil Karkra <kapil.karkra@intel.com>
Tested-by: default avatarArtur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: default avatarKeith Busch <keith.busch@intel.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 576243b3

arch/x86/include/asm/pci.h

+14 −0
Original line number Diff line number Diff line
@@ -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 */

arch/x86/pci/common.c

+7 −0
Original line number Diff line number Diff line
@@ -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->hotplug_user_indicators = 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;

}

arch/x86/pci/vmd.c

+1 −0
Original line number Diff line number Diff line
@@ -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;

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