Commit 2a5a9c9a authored by Jon Derrick's avatar Jon Derrick Committed by Lorenzo Pieralisi
Browse files

PCI: vmd: Add offset to bus numbers if necessary 



Depending on platform configuration, certain VMD devices may have an
additional configuration option which specifies the range of bus numbers
allowed in a VMD PCIe domain. We determine this requirement by checking
the value of two vendor specific config registers in the VMD endpoint:

 VMCAP[0] | VMCONFIG[9:8] | Bus Numbers
----------------------------------------
    0     |       *       |     0-255
    1     |      00       |     0-127
    1     |      01       |   128-255
    1     |      10       |     0-255

This feature is also added as a bit in driver_data, to allow future
conforming device ids which support these features to be enabled through
sysfs new_id.

Signed-off-by: default avatarJon Derrick <jonathan.derrick@intel.com>
[lorenzo.pieralisi@arm.com: updated commit subject]
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
parent 6788958e

drivers/pci/host/vmd.c

+29 −5
Original line number Diff line number Diff line
@@ -24,6 +24,10 @@ 
#define VMD_MEMBAR1	2

#define VMD_MEMBAR2	4



#define PCI_REG_VMCAP		0x40

#define BUS_RESTRICT_CAP(vmcap)	(vmcap & 0x1)

#define PCI_REG_VMCONFIG	0x44

#define BUS_RESTRICT_CFG(vmcfg)	((vmcfg >> 8) & 0x3)

#define PCI_REG_VMLOCK		0x70

#define MB2_SHADOW_EN(vmlock)	(vmlock & 0x2)
@@ -34,6 +38,12 @@ enum vmd_features { 
	 * resource assignment to enable guest virtualization

	 */

	VMD_FEAT_HAS_MEMBAR_SHADOW	= (1 << 0),



	/*

	 * Device may provide root port configuration information which limits

	 * bus numbering

	 */

	VMD_FEAT_HAS_BUS_RESTRICTIONS	= (1 << 1),

};



/*
@@ -567,7 +577,7 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features) 
	unsigned long flags;

	LIST_HEAD(resources);

	resource_size_t offset[2] = {0};

	resource_size_t membar2_offset = 0x2000;

	resource_size_t membar2_offset = 0x2000, busn_start = 0;



	/*

	 * Shadow registers may exist in certain VMD device ids which allow
@@ -598,11 +608,25 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features) 
		}

	}



	/*

	 * Certain VMD devices may have a root port configuration option which

	 * limits the bus range to between 0-127 or 128-255

	 */

	if (features & VMD_FEAT_HAS_BUS_RESTRICTIONS) {

		u32 vmcap, vmconfig;



		pci_read_config_dword(vmd->dev, PCI_REG_VMCAP, &vmcap);

		pci_read_config_dword(vmd->dev, PCI_REG_VMCONFIG, &vmconfig);

		if (BUS_RESTRICT_CAP(vmcap) &&

		    (BUS_RESTRICT_CFG(vmconfig) == 0x1))

			busn_start = 128;

	}



	res = &vmd->dev->resource[VMD_CFGBAR];

	vmd->resources[0] = (struct resource) {

		.name  = "VMD CFGBAR",

		.start = 0,

		.end   = (resource_size(res) >> 20) - 1,

		.start = busn_start,

		.end   = busn_start + (resource_size(res) >> 20) - 1,

		.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED,

	};
@@ -670,8 +694,8 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features) 
	pci_add_resource_offset(&resources, &vmd->resources[1], offset[0]);

	pci_add_resource_offset(&resources, &vmd->resources[2], offset[1]);



	vmd->bus = pci_create_root_bus(&vmd->dev->dev, 0, &vmd_ops, sd,

				       &resources);

	vmd->bus = pci_create_root_bus(&vmd->dev->dev, busn_start, &vmd_ops,

				       sd, &resources);

	if (!vmd->bus) {

		pci_free_resource_list(&resources);

		irq_domain_remove(vmd->irq_domain);

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