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From 8cc33a134681892a71a4f67397bb13a541bb463e Mon Sep 17 00:00:00 2001
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Message-Id: <8cc33a134681892a71a4f67397bb13a541bb463e.1566225007.git.aquini@redhat.com>
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In-Reply-To: <d42f467a923dfc09309acb7a83b42e3285fbd8f4.1566225007.git.aquini@redhat.com>
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References: <d42f467a923dfc09309acb7a83b42e3285fbd8f4.1566225007.git.aquini@redhat.com>
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From: Sandipan Das <sandipan@linux.ibm.com>
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Date: Thu, 15 Aug 2019 13:08:38 +0530
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Subject: [RHEL7 PATCH 11/31] hugeutils: Add utility to check if slices are
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supported
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This adds an utility to check if the current processor
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architecture supports slices. Slices are used to divide
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up a virtual address space and put certain restrictions
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like on powerpc64 with Hash MMU where one can have only
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one page size per slice.
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Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
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Signed-off-by: Eric B Munson <emunson@mgebm.net>
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Signed-off-by: Rafael Aquini <aquini@redhat.com>
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---
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hugeutils.c | 21 +++++++++++++++++++++
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libhugetlbfs_privutils.h | 3 +++
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2 files changed, 24 insertions(+)
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diff --git a/hugeutils.c b/hugeutils.c
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index fc64946..e573622 100644
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--- a/hugeutils.c
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+++ b/hugeutils.c
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@@ -800,6 +800,27 @@ int hpool_sizes(struct hpage_pool *pools, int pcnt)
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return (which < pcnt) ? which : -1;
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}
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+int arch_has_slice_support(void)
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+{
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+#ifdef __powerpc64__
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+ char mmu_type[16];
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+ FILE *fp;
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+
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+ fp = popen("cat /proc/cpuinfo | grep MMU | awk '{ print $3}'", "r");
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+ if (!fp || fscanf(fp, "%s", mmu_type) < 0) {
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+ ERROR("Failed to determine MMU type\n");
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+ abort();
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+ }
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+
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+ pclose(fp);
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+ return strcmp(mmu_type, "Hash") == 0;
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+#elif defined(__powerpc__) && !defined(PPC_NO_SEGMENTS)
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+ return 1;
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+#else
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+ return 0;
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+#endif
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+}
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+
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/*
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* If we have a default page size then we support hugepages.
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*/
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diff --git a/libhugetlbfs_privutils.h b/libhugetlbfs_privutils.h
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index 149e42f..8b12fed 100644
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--- a/libhugetlbfs_privutils.h
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+++ b/libhugetlbfs_privutils.h
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@@ -53,6 +53,9 @@ int set_nr_hugepages(long pagesize, unsigned long val);
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#define set_nr_overcommit_hugepages __pu_set_nr_overcommit_hugepages
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int set_nr_overcommit_hugepages(long pagesize, unsigned long val);
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+#define arch_has_slice_support __pu_arch_has_slice_support
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+int arch_has_slice_support(void);
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+
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#define kernel_has_hugepages __pu_kernel_has_hugepages
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int kernel_has_hugepages(void);
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--
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1.8.3.1
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