| Message ID | 1450811957-1511-4-git-send-email-Suravee.Suthikulpanit@amd.com |
|---|---|
| State | New |
| Headers | show |
Hi Jorge, On 12/28/15 09:43, Joerg Roedel wrote: > On Tue, Dec 22, 2015 at 01:19:14PM -0600, Suthikulpanit, Suravee wrote: >> 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 <Suravee.Suthikulpanit@amd.com> >> --- >> drivers/iommu/amd_iommu_init.c | 16 ++++++++++++++++ >> include/linux/perf/perf_event_amd_iommu.h | 2 ++ >> 2 files changed, 18 insertions(+) >> >> diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c >> index 275c0f5..9c62613 100644 >> --- a/drivers/iommu/amd_iommu_init.c >> +++ b/drivers/iommu/amd_iommu_init.c >> @@ -2244,6 +2244,22 @@ bool amd_iommu_v2_supported(void) >> } >> EXPORT_SYMBOL(amd_iommu_v2_supported); >> >> +static int amd_iommu_cnt; >> + >> +int amd_iommu_get_num_iommus(void) >> +{ >> + struct amd_iommu *iommu; >> + >> + if (amd_iommu_cnt) >> + return amd_iommu_cnt; >> + >> + for_each_iommu(iommu) >> + amd_iommu_cnt++; > > It is better to set amd_iommu_cnt during IOMMU initialization. You can > just increment this value after an IOMMU has been set up. > > > > Joerg > Sure. I'll take care of this in V2. Thanks, Suravee -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 275c0f5..9c62613 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -2244,6 +2244,22 @@ bool amd_iommu_v2_supported(void) } EXPORT_SYMBOL(amd_iommu_v2_supported); +static int amd_iommu_cnt; + +int amd_iommu_get_num_iommus(void) +{ + struct amd_iommu *iommu; + + if (amd_iommu_cnt) + return amd_iommu_cnt; + + for_each_iommu(iommu) + amd_iommu_cnt++; + + return amd_iommu_cnt; +} +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);
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 <Suravee.Suthikulpanit@amd.com> --- drivers/iommu/amd_iommu_init.c | 16 ++++++++++++++++ include/linux/perf/perf_event_amd_iommu.h | 2 ++ 2 files changed, 18 insertions(+) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/