Commit 08bcdd22 authored by Jon Derrick's avatar Jon Derrick Committed by Lorenzo Pieralisi
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PCI: vmd: Add bus 224-255 restriction decode 



VMD bus restrictions are required when IO fabric is multiplexed such
that VMD cannot use the entire bus range. This patch adds another bus
restriction decode bit that can be set by firmware to restrict the VMD
bus range to between 224-255.

Signed-off-by: default avatarJon Derrick <jonathan.derrick@intel.com>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
parent 54ecb8f7

drivers/pci/controller/vmd.c

+22 −8
Original line number Diff line number Diff line
@@ -602,16 +602,30 @@ 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

	 * limits the bus range to between 0-127, 128-255, or 224-255

	 */

	if (features & VMD_FEAT_HAS_BUS_RESTRICTIONS) {

		u32 vmcap, vmconfig;

		u16 reg16;



		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))

		pci_read_config_word(vmd->dev, PCI_REG_VMCAP, &reg16);

		if (BUS_RESTRICT_CAP(reg16)) {

			pci_read_config_word(vmd->dev, PCI_REG_VMCONFIG,

					     &reg16);



			switch (BUS_RESTRICT_CFG(reg16)) {

			case 1:

				vmd->busn_start = 128;

				break;

			case 2:

				vmd->busn_start = 224;

				break;

			case 3:

				pci_err(vmd->dev, "Unknown Bus Offset Setting\n");

				return -ENODEV;

			default:

				break;

			}

		}

	}



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

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