From: Suravee Suthikulpanit via iommu <iommu@lists.linux-foundation.org>
To: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org
Cc: Jon.Grimm@amd.com, wei.huang2@amd.com
Subject: [PATCH 1/3] iommu/amd: Introduce helper function to check feature bit on all IOMMUs
Date: Fri, 20 Aug 2021 15:29:55 -0500 [thread overview]
Message-ID: <20210820202957.187572-2-suravee.suthikulpanit@amd.com> (raw)
In-Reply-To: <20210820202957.187572-1-suravee.suthikulpanit@amd.com>
IOMMU advertises feature via Extended Features Register (EFR).
The helper function checks if the specified feature bit is set
across all IOMMUs.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
drivers/iommu/amd/init.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 46280e6e1535..c97961451ac5 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -298,6 +298,19 @@ int amd_iommu_get_num_iommus(void)
return amd_iommus_present;
}
+static bool check_feature_on_all_iommus(u64 mask)
+{
+ bool ret = false;
+ struct amd_iommu *iommu;
+
+ for_each_iommu(iommu) {
+ ret = iommu_feature(iommu, mask);
+ if (!ret)
+ return false;
+ }
+
+ return true;
+}
/*
* For IVHD type 0x11/0x40, EFR is also available via IVHD.
* Default to IVHD EFR since it is available sooner
--
2.17.1
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next prev parent reply other threads:[~2021-08-20 20:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-20 20:29 [PATCH 0/3] iommu/amd: Fix unable to handle page fault due to AVIC Suravee Suthikulpanit via iommu
2021-08-20 20:29 ` Suravee Suthikulpanit via iommu [this message]
2021-08-20 20:29 ` [PATCH 2/3] iommu/amd: Relocate GAMSup check to early_enable_iommus Suravee Suthikulpanit via iommu
2021-08-20 20:29 ` [PATCH 3/3] iommu/amd: Remove iommu_init_ga() Suravee Suthikulpanit via iommu
2021-08-31 17:10 ` [PATCH 0/3] iommu/amd: Fix unable to handle page fault due to AVIC Suthikulpanit, Suravee via iommu
2021-09-02 7:38 ` Joerg Roedel
2021-09-02 16:13 ` Suthikulpanit, Suravee via iommu
2021-09-09 9:36 ` Joerg Roedel
2021-09-09 11:17 ` Joerg Roedel
2021-09-10 18:01 ` Wei Huang via iommu
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