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Message-ID: <20241007075037.267650-5-osalvador@suse.de>
Date: Mon, 7 Oct 2024 09:50:32 +0200
From: Oscar Salvador <osalvador@...e.de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
linux-mm@...ck.org,
Peter Xu <peterx@...hat.com>,
Muchun Song <muchun.song@...ux.dev>,
David Hildenbrand <david@...hat.com>,
Donet Tom <donettom@...ux.ibm.com>,
Vlastimil Babka <vbabka@...e.cz>,
Michal Hocko <mhocko@...e.com>,
Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
Oscar Salvador <osalvador@...e.de>
Subject: [PATCH v4 4/9] arch/sparc: Teach arch_get_unmapped_area{_topdown} to handle hugetlb mappings
We want to stop special casing hugetlb mappings and make them go
through generic channels, so teach arch_get_unmapped_area{_topdown}
to handle those.
sparc specific hugetlb function does not set info.align_offset, and
does not care about adjusting the align_mask for MAP_SHARED cases,
so the same here for compatibility.
Signed-off-by: Oscar Salvador <osalvador@...e.de>
---
arch/sparc/kernel/sys_sparc_32.c | 17 +++++++++++----
arch/sparc/kernel/sys_sparc_64.c | 37 +++++++++++++++++++++++++-------
2 files changed, 42 insertions(+), 12 deletions(-)
diff --git a/arch/sparc/kernel/sys_sparc_32.c b/arch/sparc/kernel/sys_sparc_32.c
index 80822f922e76..fb31bc0c5b48 100644
--- a/arch/sparc/kernel/sys_sparc_32.c
+++ b/arch/sparc/kernel/sys_sparc_32.c
@@ -23,6 +23,7 @@
#include <linux/utsname.h>
#include <linux/smp.h>
#include <linux/ipc.h>
+#include <linux/hugetlb.h>
#include <linux/uaccess.h>
#include <asm/unistd.h>
@@ -42,12 +43,16 @@ SYSCALL_DEFINE0(getpagesize)
unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags, vm_flags_t vm_flags)
{
struct vm_unmapped_area_info info = {};
+ bool file_hugepage = false;
+
+ if (filp && is_file_hugepages(filp))
+ file_hugepage = true;
if (flags & MAP_FIXED) {
/* We do not accept a shared mapping if it would violate
* cache aliasing constraints.
*/
- if ((flags & MAP_SHARED) &&
+ if (!file_hugepage && (flags & MAP_SHARED) &&
((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
return -EINVAL;
return addr;
@@ -62,9 +67,13 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
info.length = len;
info.low_limit = addr;
info.high_limit = TASK_SIZE;
- info.align_mask = (flags & MAP_SHARED) ?
- (PAGE_MASK & (SHMLBA - 1)) : 0;
- info.align_offset = pgoff << PAGE_SHIFT;
+ if (!file_hugepage) {
+ info.align_mask = (flags & MAP_SHARED) ?
+ (PAGE_MASK & (SHMLBA - 1)) : 0;
+ info.align_offset = pgoff << PAGE_SHIFT;
+ } else {
+ info.align_mask = huge_page_mask_align(filp);
+ }
return vm_unmapped_area(&info);
}
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
index acade309dc2f..c5a284df7b41 100644
--- a/arch/sparc/kernel/sys_sparc_64.c
+++ b/arch/sparc/kernel/sys_sparc_64.c
@@ -30,6 +30,7 @@
#include <linux/context_tracking.h>
#include <linux/timex.h>
#include <linux/uaccess.h>
+#include <linux/hugetlb.h>
#include <asm/utrap.h>
#include <asm/unistd.h>
@@ -87,6 +88,16 @@ static inline unsigned long COLOR_ALIGN(unsigned long addr,
return base + off;
}
+static unsigned long get_align_mask(struct file *filp, unsigned long flags)
+{
+ if (filp && is_file_hugepages(filp))
+ return huge_page_mask_align(filp);
+ if (filp || (flags & MAP_SHARED))
+ return PAGE_MASK & (SHMLBA - 1);
+
+ return 0;
+}
+
unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags, vm_flags_t vm_flags)
{
struct mm_struct *mm = current->mm;
@@ -94,12 +105,16 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
unsigned long task_size = TASK_SIZE;
int do_color_align;
struct vm_unmapped_area_info info = {};
+ bool file_hugepage = false;
+
+ if (filp && is_file_hugepages(filp))
+ file_hugepage = true;
if (flags & MAP_FIXED) {
/* We do not accept a shared mapping if it would violate
* cache aliasing constraints.
*/
- if ((flags & MAP_SHARED) &&
+ if (!file_hugepage && (flags & MAP_SHARED) &&
((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
return -EINVAL;
return addr;
@@ -111,7 +126,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
return -ENOMEM;
do_color_align = 0;
- if (filp || (flags & MAP_SHARED))
+ if ((filp || (flags & MAP_SHARED)) && !file_hugepage)
do_color_align = 1;
if (addr) {
@@ -129,8 +144,9 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
info.length = len;
info.low_limit = TASK_UNMAPPED_BASE;
info.high_limit = min(task_size, VA_EXCLUDE_START);
- info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
- info.align_offset = pgoff << PAGE_SHIFT;
+ info.align_mask = get_align_mask(filp, flags);
+ if (!file_hugepage)
+ info.align_offset = pgoff << PAGE_SHIFT;
addr = vm_unmapped_area(&info);
if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
@@ -154,15 +170,19 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
unsigned long addr = addr0;
int do_color_align;
struct vm_unmapped_area_info info = {};
+ bool file_hugepage = false;
/* This should only ever run for 32-bit processes. */
BUG_ON(!test_thread_flag(TIF_32BIT));
+ if (filp && is_file_hugepages(filp))
+ file_hugepage = true;
+
if (flags & MAP_FIXED) {
/* We do not accept a shared mapping if it would violate
* cache aliasing constraints.
*/
- if ((flags & MAP_SHARED) &&
+ if (!file_hugepage && (flags & MAP_SHARED) &&
((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
return -EINVAL;
return addr;
@@ -172,7 +192,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
return -ENOMEM;
do_color_align = 0;
- if (filp || (flags & MAP_SHARED))
+ if ((filp || (flags & MAP_SHARED)) && !file_hugepage)
do_color_align = 1;
/* requesting a specific address */
@@ -192,8 +212,9 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
info.length = len;
info.low_limit = PAGE_SIZE;
info.high_limit = mm->mmap_base;
- info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
- info.align_offset = pgoff << PAGE_SHIFT;
+ info.align_mask = get_align_mask(filp, flags);
+ if (!file_hugepage)
+ info.align_offset = pgoff << PAGE_SHIFT;
addr = vm_unmapped_area(&info);
/*
--
2.46.1
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