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x86/events, drivers/iommu/amd: Introduce amd_iommu_get_num_iommus()

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Introduce amd_iommu_get_num_iommus(), which returns the value of
amd_iommus_present. The function is used to replace direct access to the
variable, which is now declared as static.

This function will also be used by AMD IOMMU perf driver.

Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Jörg Rödel <joro@8bytes.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: iommu@lists.linux-foundation.org
Link: http://lkml.kernel.org/r/1487926102-13073-6-git-send-email-Suravee.Suthikulpanit@amd.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Suravee Suthikulpanit
2017-02-24 02:48:17 -06:00
committed by Ingo Molnar
parent 0a6d80c70b
commit 6b9376e30f
5 changed files with 15 additions and 8 deletions
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11
drivers/iommu/amd_iommu_init.c
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@@ -167,7 +167,9 @@ LIST_HEAD(amd_iommu_list); /* list of all AMD IOMMUs in the
/* Array to assign indices to IOMMUs*/
struct amd_iommu *amd_iommus[MAX_IOMMUS];
int amd_iommus_present;
/* Number of IOMMUs present in the system */
static int amd_iommus_present;
/* IOMMUs have a non-present cache? */
bool amd_iommu_np_cache __read_mostly;
@@ -272,6 +274,11 @@ static inline unsigned long tbl_size(int entry_size)
return 1UL << shift;
}
int amd_iommu_get_num_iommus(void)
{
return amd_iommus_present;
}
/* Access to l1 and l2 indexed register spaces */
static u32 iommu_read_l1(struct amd_iommu *iommu, u16 l1, u8 address)
@@ -1336,7 +1343,7 @@ 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");