linux-kernel - [PATCH 2/2] iommu/amd: Only support x2APIC with IVHD type 11h/40h

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Message-Id: <1574258149-15602-3-git-send-email-suravee.suthikulpanit@amd.com>
Date:   Wed, 20 Nov 2019 07:55:49 -0600
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     joro@...tes.org,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH 2/2] iommu/amd: Only support x2APIC with IVHD type 11h/40h

Current implementation for IOMMU x2APIC support makes use of
the MMIO access to MSI capability block registers, which requires
checking EFR[MsiCapMmioSup]. However, only IVHD type 11h/40h contain
the information, and not in the IVHD type 10h IOMMU feature reporting
field. Since the BIOS in newer systems, which supports x2APIC, would
normally contain IVHD type 11h/40h, remove the IOMMU_FEAT_XTSUP_SHIFT
check for IVHD type 10h, and only support x2APIC with IVHD type 11h/40h.

Fixes: 66929812955b ('iommu/amd: Add support for X2APIC IOMMU interrupts')
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
---
 drivers/iommu/amd_iommu_init.c  | 2 --
 drivers/iommu/amd_iommu_types.h | 1 -
 2 files changed, 3 deletions(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 1dcc0b3..2be4020 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1520,8 +1520,6 @@ static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
 			iommu->mmio_phys_end = MMIO_CNTR_CONF_OFFSET;
 		if (((h->efr_attr & (0x1 << IOMMU_FEAT_GASUP_SHIFT)) == 0))
 			amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY;
-		if (((h->efr_attr & (0x1 << IOMMU_FEAT_XTSUP_SHIFT)) == 0))
-			amd_iommu_xt_mode = IRQ_REMAP_XAPIC_MODE;
 		break;
 	case 0x11:
 	case 0x40:
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index 89b0c6e..3a94169 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -377,7 +377,6 @@
 #define IOMMU_CAP_EFR     27
 
 /* IOMMU Feature Reporting Field (for IVHD type 10h */
-#define IOMMU_FEAT_XTSUP_SHIFT	0
 #define IOMMU_FEAT_GASUP_SHIFT	6
 
 /* IOMMU Extended Feature Register (EFR) */
-- 
1.8.3.1