Attachment 9153 Details for Bug 39607 – Patch 1/3

[patch] Patch 1/3

0001-PCI-vmd-Add-bus-224-255-restriction-decode.patch (text/plain), 1.95 KB, created by Николай Костригин on 2021-01-26 18:39:11 MSK

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Creator: Николай Костригин

Created: 2021-01-26 18:39:11 MSK

Size: 1.95 KB

patch

obsolete

>From 8f5e6124b384e93b8df666ef87dac7a350d1ee6f Mon Sep 17 00:00:00 2001
>From: Jon Derrick <jonathan.derrick@intel.com>
>Date: Tue, 12 Nov 2019 05:47:52 -0700
>Subject: [PATCH 1/3] 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: Jon Derrick <jonathan.derrick@intel.com>
>Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
>---
> drivers/pci/controller/vmd.c | 30 ++++++++++++++++++++++--------
> 1 file changed, 22 insertions(+), 8 deletions(-)
>
>diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
>index 9966dcf1d112..41f4c1c825e6 100644
>--- a/drivers/pci/controller/vmd.c
>+++ b/drivers/pci/controller/vmd.c
>@@ -604,16 +604,30 @@ 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;
>-
>-		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))
>-			vmd->busn_start = 128;
>+		u16 reg16;
>+
>+		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];
>-- 
>2.29.2
>

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