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From: Dan Williams <dan.j.williams@intel.com>
To: akpm@linux-foundation.org
Cc: linux-nvdimm@lists.01.org, x86@kernel.org, linux-mm@kvack.org,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: [-mm PATCH v2 16/25] x86, mm: introduce _PAGE_DEVMAP
Date: Wed, 09 Dec 2015 18:38:39 -0800	[thread overview]
Message-ID: <20151210023839.30368.51358.stgit@dwillia2-desk3.jf.intel.com> (raw)
In-Reply-To: <20151210023708.30368.92962.stgit@dwillia2-desk3.jf.intel.com>

_PAGE_DEVMAP is a hardware-unused pte bit that will later be used in the
get_user_pages() path to identify pfns backed by the dynamic allocation
established by devm_memremap_pages.  Upon seeing that bit the gup path
will lookup and pin the allocation while the pages are in use.

Since the _PAGE_DEVMAP bit is > 32 it must be cast to u64 instead of a
pteval_t to allow pmd_flags() usage in the realmode boot code to build.

Cc: x86@kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 arch/x86/include/asm/pgtable_types.h |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index d1b76f88ccd1..04c27a013165 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -24,7 +24,9 @@
 #define _PAGE_BIT_CPA_TEST	_PAGE_BIT_SOFTW1
 #define _PAGE_BIT_HIDDEN	_PAGE_BIT_SOFTW3 /* hidden by kmemcheck */
 #define _PAGE_BIT_SOFT_DIRTY	_PAGE_BIT_SOFTW3 /* software dirty tracking */
-#define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */
+#define _PAGE_BIT_SOFTW4	58	/* available for programmer */
+#define _PAGE_BIT_DEVMAP		_PAGE_BIT_SOFTW4
+#define _PAGE_BIT_NX		63	/* No execute: only valid after cpuid check */
 
 /* If _PAGE_BIT_PRESENT is clear, we use these: */
 /* - if the user mapped it with PROT_NONE; pte_present gives true */
@@ -83,8 +85,11 @@
 
 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
 #define _PAGE_NX	(_AT(pteval_t, 1) << _PAGE_BIT_NX)
+#define _PAGE_DEVMAP	(_AT(u64, 1) << _PAGE_BIT_DEVMAP)
+#define __HAVE_ARCH_PTE_DEVMAP
 #else
 #define _PAGE_NX	(_AT(pteval_t, 0))
+#define _PAGE_DEVMAP	(_AT(pteval_t, 0))
 #endif
 
 #define _PAGE_PROTNONE	(_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)

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  parent reply	other threads:[~2015-12-10  2:38 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-10  2:37 [-mm PATCH v2 00/25] get_user_pages() for dax pte and pmd mappings Dan Williams
2015-12-10  2:37 ` [-mm PATCH v2 01/25] pmem, dax: clean up clear_pmem() Dan Williams
2015-12-10  2:37 ` [-mm PATCH v2 02/25] dax: increase granularity of dax_clear_blocks() operations Dan Williams
2015-12-10  2:37 ` [-mm PATCH v2 03/25] dax: guarantee page aligned results from bdev_direct_access() Dan Williams
2015-12-10  2:37 ` [-mm PATCH v2 04/25] dax: fix lifetime of in-kernel dax mappings with dax_map_atomic() Dan Williams
2015-12-11 18:11   ` [-mm PATCH v3 " Dan Williams
2015-12-17 22:00     ` Ross Zwisler
2015-12-17 22:16       ` Dan Williams
2015-12-10  2:37 ` [-mm PATCH v2 05/25] mm, dax: fix livelock, allow dax pmd mappings to become writeable Dan Williams
2015-12-10  2:37 ` [-mm PATCH v2 06/25] dax: Split pmd map when fallback on COW Dan Williams
2015-12-10  2:37 ` [-mm PATCH v2 07/25] um: kill pfn_t Dan Williams
2015-12-10  2:37 ` [-mm PATCH v2 08/25] kvm: rename pfn_t to kvm_pfn_t Dan Williams
2015-12-10  2:37 ` [-mm PATCH v2 09/25] mm, dax, pmem: introduce pfn_t Dan Williams
2015-12-11 18:22   ` [-mm PATCH v3 " Dan Williams
2015-12-10  2:38 ` [-mm PATCH v2 10/25] mm: introduce find_dev_pagemap() Dan Williams
2015-12-11 18:27   ` [-mm PATCH v3 " Dan Williams
2015-12-10  2:38 ` [-mm PATCH v2 11/25] x86, mm: introduce vmem_altmap to augment vmemmap_populate() Dan Williams
2015-12-15 16:50   ` Dan Williams
2015-12-15 23:28   ` Andrew Morton
2015-12-15 23:37     ` Dan Williams
2015-12-10  2:38 ` [-mm PATCH v2 12/25] libnvdimm, pfn, pmem: allocate memmap array in persistent memory Dan Williams
2015-12-10  2:38 ` [-mm PATCH v2 13/25] avr32: convert to asm-generic/memory_model.h Dan Williams
2015-12-10  2:38 ` [-mm PATCH v2 14/25] hugetlb: fix compile error on tile Dan Williams
2015-12-10  2:38 ` [-mm PATCH v2 15/25] frv: fix compiler warning from definition of __pmd() Dan Williams
2015-12-10  2:38 ` Dan Williams [this message]
2015-12-10  2:38 ` [-mm PATCH v2 17/25] mm, dax, gpu: convert vm_insert_mixed to pfn_t Dan Williams
2015-12-10  2:38 ` [-mm PATCH v2 18/25] mm, dax: convert vmf_insert_pfn_pmd() " Dan Williams
2015-12-10  2:38 ` [-mm PATCH v2 19/25] list: introduce list_del_poison() Dan Williams
2015-12-15 23:41   ` Andrew Morton
2015-12-16  0:17     ` Dan Williams
2015-12-10  2:39 ` [-mm PATCH v2 20/25] libnvdimm, pmem: move request_queue allocation earlier in probe Dan Williams
2015-12-10  2:39 ` [-mm PATCH v2 21/25] mm, dax, pmem: introduce {get|put}_dev_pagemap() for dax-gup Dan Williams
2015-12-15 23:46   ` Andrew Morton
2015-12-10  2:39 ` [-mm PATCH v2 22/25] mm, dax: dax-pmd vs thp-pmd vs hugetlbfs-pmd Dan Williams
2015-12-10  2:39 ` [-mm PATCH v2 23/25] mm, x86: get_user_pages() for dax mappings Dan Williams
2015-12-16  0:14   ` Andrew Morton
2015-12-16  2:18     ` Dan Williams
2015-12-18  0:09       ` Dan Williams
2015-12-10  2:39 ` [-mm PATCH v2 24/25] dax: provide diagnostics for pmd mapping failures Dan Williams
2015-12-10  2:39 ` [-mm PATCH v2 25/25] dax: re-enable dax pmd mappings Dan Williams
2015-12-10 18:08 ` [-mm PATCH v2 00/25] get_user_pages() for dax pte and " Jeff Moyer
2015-12-10 18:56   ` Dan Williams
2015-12-10 19:20     ` Jeff Moyer
2015-12-11  2:03       ` Dan Williams
2015-12-14 14:52         ` Jeff Moyer
2015-12-14 16:44           ` Dan Williams
2015-12-11 18:44 ` Dan Williams
2015-12-15  1:59   ` Dan Williams

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