From: Mike Kravetz <mike.kravetz@oracle.com>
To: sparclinux@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Cc: "David S . Miller" <davem@davemloft.net>,
Bob Picco <bob.picco@oracle.com>,
Nitin Gupta <nitin.m.gupta@oracle.com>,
Vijay Kumar <vijay.ac.kumar@oracle.com>,
Julian Calaby <julian.calaby@gmail.com>,
Adam Buchbinder <adam.buchbinder@gmail.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Michal Hocko <mhocko@suse.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Kravetz <mike.kravetz@oracle.com>
Subject: [RFC PATCH 01/14] sparc64: placeholder for needed mmu shared context patching
Date: Fri, 16 Dec 2016 10:35:24 -0800 [thread overview]
Message-ID: <1481913337-9331-2-git-send-email-mike.kravetz@oracle.com> (raw)
In-Reply-To: <1481913337-9331-1-git-send-email-mike.kravetz@oracle.com>
MMU shared context patching will be supported on Sun4V platforms with
Niagara 2 or later processors. There will be a need for kernel patching
based on this criteria. This 'patch' simply adds a comment as a reminder
and placeholder to add that support.
For now, MMU shared context support will be determined at follows:
- sun4v patching will be used for shared context support. This is too
general as most but not all sun4v platforms contain the required
processors.
- A new config option (CONFIG_SHARED_MMU_CTX) is added
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
---
arch/sparc/kernel/setup_64.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index 6b7331d..ffda69b 100644
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -276,6 +276,17 @@ void sun_m7_patch_2insn_range(struct sun4v_2insn_patch_entry *start,
}
}
+/*
+ * FIXME - TODO
+ *
+ * Shared MMU context support will only be provided on sun4v platforms
+ * with Niagara 2 or later processors. A patching mechanism for this
+ * this type of support will need to be implemented. For now, the code
+ * is making the too general assumption of supporting shared context on
+ * all sun4v platforms. This is a placeholder to add correct support
+ * at a later time.
+ */
+
static void __init sun4v_patch(void)
{
extern void sun4v_hvapi_init(void);
--
2.7.4
next prev parent reply other threads:[~2016-12-16 18:36 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-16 18:35 [RFC PATCH 00/14] sparc64 shared context/TLB support Mike Kravetz
2016-12-16 18:35 ` Mike Kravetz [this message]
2016-12-16 18:35 ` [RFC PATCH 02/14] sparc64: add new fields to mmu context for shared context support Mike Kravetz
2016-12-17 7:34 ` Sam Ravnborg
2016-12-18 23:33 ` Mike Kravetz
2016-12-21 18:12 ` Sam Ravnborg
2016-12-17 7:38 ` Sam Ravnborg
2016-12-18 23:45 ` Mike Kravetz
2016-12-21 18:13 ` Sam Ravnborg
2016-12-16 18:35 ` [RFC PATCH 03/14] sparc64: routines for basic mmu shared context structure management Mike Kravetz
2016-12-18 3:07 ` David Miller
2016-12-16 18:35 ` [RFC PATCH 04/14] sparc64: load shared id into context register 1 Mike Kravetz
2016-12-17 7:45 ` Sam Ravnborg
2016-12-19 0:22 ` Mike Kravetz
2016-12-21 18:16 ` Sam Ravnborg
2016-12-18 3:14 ` David Miller
2016-12-19 0:06 ` Mike Kravetz
2016-12-20 18:33 ` David Miller
2016-12-20 20:27 ` Mike Kravetz
2016-12-21 18:17 ` Sam Ravnborg
2016-12-16 18:35 ` [RFC PATCH 05/14] sparc64: Add PAGE_SHR_CTX flag Mike Kravetz
2016-12-18 3:12 ` David Miller
2016-12-19 0:42 ` Mike Kravetz
2016-12-20 18:33 ` David Miller
2016-12-16 18:35 ` [RFC PATCH 06/14] sparc64: general shared context tsb creation and support Mike Kravetz
2016-12-17 7:53 ` Sam Ravnborg
2016-12-19 0:52 ` Mike Kravetz
2016-12-16 18:35 ` [RFC PATCH 07/14] sparc64: move COMPUTE_TAG_TARGET and COMPUTE_TSB_PTR to header file Mike Kravetz
2016-12-16 18:35 ` [RFC PATCH 08/14] sparc64: shared context tsb handling at context switch time Mike Kravetz
2016-12-16 18:35 ` [RFC PATCH 09/14] sparc64: TLB/TSB miss handling for shared context Mike Kravetz
2016-12-16 18:35 ` [RFC PATCH 10/14] mm: add shared context to vm_area_struct Mike Kravetz
2016-12-16 18:35 ` [RFC PATCH 11/14] sparc64: add routines to look for vmsa which can share context Mike Kravetz
2016-12-16 18:35 ` [RFC PATCH 12/14] mm: add mmap and shmat arch hooks for shared context Mike Kravetz
2016-12-16 18:35 ` [RFC PATCH 13/14] sparc64 mm: add shared context support to mmap() and shmat() APIs Mike Kravetz
2016-12-16 18:35 ` [RFC PATCH 14/14] sparc64: add SHARED_MMU_CTX Kconfig option Mike Kravetz
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