From: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> To: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org Cc: joro@8bytes.org, Jon.Grimm@amd.com, wei.huang2@amd.com, Suravee Suthikulpanit <suravee.suthikulpanit@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
WARNING: multiple messages have this Message-ID (diff)
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 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2021-08-20 20:08 UTC|newest] Thread overview: 20+ 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 2021-08-20 20:29 ` Suravee Suthikulpanit via iommu 2021-08-20 20:29 ` Suravee Suthikulpanit [this message] 2021-08-20 20:29 ` [PATCH 1/3] iommu/amd: Introduce helper function to check feature bit on all IOMMUs Suravee Suthikulpanit via iommu 2021-08-20 20:29 ` [PATCH 2/3] iommu/amd: Relocate GAMSup check to early_enable_iommus Suravee Suthikulpanit 2021-08-20 20:29 ` Suravee Suthikulpanit via iommu 2021-08-20 20:29 ` [PATCH 3/3] iommu/amd: Remove iommu_init_ga() Suravee Suthikulpanit 2021-08-20 20:29 ` 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 2021-08-31 17:10 ` Suthikulpanit, Suravee via iommu 2021-09-02 7:38 ` Joerg Roedel 2021-09-02 7:38 ` Joerg Roedel 2021-09-02 16:13 ` Suthikulpanit, Suravee 2021-09-02 16:13 ` Suthikulpanit, Suravee via iommu 2021-09-09 9:36 ` Joerg Roedel 2021-09-09 9:36 ` Joerg Roedel 2021-09-09 11:17 ` Joerg Roedel 2021-09-09 11:17 ` Joerg Roedel 2021-09-10 18:01 ` Wei Huang 2021-09-10 18:01 ` Wei Huang via iommu
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