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Groups > linux.kernel > #1297012 > unrolled thread
| Started by | Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> |
|---|---|
| First post | 2015-12-22 20:40 +0100 |
| Last post | 2015-12-29 22:30 +0100 |
| Articles | 3 — 2 participants |
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[PATCH 3/6] iommu/amd: Introduce amd_iommu_get_num_iommus() Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> - 2015-12-22 20:40 +0100
Re: [PATCH 3/6] iommu/amd: Introduce amd_iommu_get_num_iommus() Joerg Roedel <joro@8bytes.org> - 2015-12-28 16:50 +0100
Re: [PATCH 3/6] iommu/amd: Introduce amd_iommu_get_num_iommus() Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> - 2015-12-29 22:30 +0100
| From | Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> |
|---|---|
| Date | 2015-12-22 20:40 +0100 |
| Subject | [PATCH 3/6] iommu/amd: Introduce amd_iommu_get_num_iommus() |
| Message-ID | <qIAWR-86s-9@gated-at.bofh.it> |
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++;
+
+ 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);
--
1.9.1
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| From | Joerg Roedel <joro@8bytes.org> |
|---|---|
| Date | 2015-12-28 16:50 +0100 |
| Message-ID | <qKIdB-43M-31@gated-at.bofh.it> |
| In reply to | #1297012 |
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
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| From | Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> |
|---|---|
| Date | 2015-12-29 22:30 +0100 |
| Message-ID | <qLa0a-5S6-11@gated-at.bofh.it> |
| In reply to | #1298689 |
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
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