From mboxrd@z Thu Jan 1 00:00:00 1970 From: Suravee Suthikulpanit Subject: [PATCH v2 3/6] iommu/amd: Introduce amd_iommu_get_num_iommus() Date: Fri, 1 Jan 2016 12:13:37 -0600 Message-ID: <1451672020-2150-4-git-send-email-Suravee.Suthikulpanit@amd.com> References: <1451672020-2150-1-git-send-email-Suravee.Suthikulpanit@amd.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1451672020-2150-1-git-send-email-Suravee.Suthikulpanit@amd.com> Sender: linux-kernel-owner@vger.kernel.org To: joro@8bytes.org, bp@alien8.de, peterz@infradead.org, mingo@redhat.com, acme@kernel.org Cc: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Suravee Suthikulpanit List-Id: iommu@lists.linux-foundation.org This patch introduces amd_iommu_get_num_iommus(). Initially, this is intended to be used by Perf AMD IOMMU driver. Signed-off-by: Suravee Suthikulpanit --- drivers/iommu/amd_iommu_init.c | 8 +++++++- include/linux/perf/perf_event_amd_iommu.h | 2 ++ 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 275c0f5..33dbf3f 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -1030,7 +1030,7 @@ static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h) /* Add IOMMU to internal data structures */ list_add_tail(&iommu->list, &amd_iommu_list); - iommu->index = amd_iommus_present++; + iommu->index = amd_iommus_present++; if (unlikely(iommu->index >= MAX_IOMMUS)) { WARN(1, "AMD-Vi: System has more IOMMUs than supported by this driver\n"); @@ -2244,6 +2244,12 @@ bool amd_iommu_v2_supported(void) } EXPORT_SYMBOL(amd_iommu_v2_supported); +int amd_iommu_get_num_iommus(void) +{ + return amd_iommus_present; +} +EXPORT_SYMBOL(amd_iommu_get_num_iommus); + /**************************************************************************** * * IOMMU EFR Performance Counter support functionality. This code allows diff --git a/include/linux/perf/perf_event_amd_iommu.h b/include/linux/perf/perf_event_amd_iommu.h index 815eabb..cb820c2 100644 --- a/include/linux/perf/perf_event_amd_iommu.h +++ b/include/linux/perf/perf_event_amd_iommu.h @@ -25,6 +25,8 @@ #define PC_MAX_SPEC_CNTRS 16 /* amd_iommu_init.c external support functions */ +extern int amd_iommu_get_num_iommus(void); + extern bool amd_iommu_pc_supported(void); extern u8 amd_iommu_pc_get_max_banks(void); -- 1.9.1