ca5999fde0
The include/linux/pgtable.h is going to be the home of generic page table manipulation functions. Start with moving asm-generic/pgtable.h to include/linux/pgtable.h and make the latter include asm/pgtable.h. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200514170327.31389-3-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
102 lines
3.3 KiB
C
102 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright 2013 Red Hat Inc.
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*
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* Authors: Jérôme Glisse <jglisse@redhat.com>
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*
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* See Documentation/vm/hmm.rst for reasons and overview of what HMM is.
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*/
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#ifndef LINUX_HMM_H
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#define LINUX_HMM_H
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#include <linux/kconfig.h>
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#include <linux/pgtable.h>
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#include <linux/device.h>
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#include <linux/migrate.h>
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#include <linux/memremap.h>
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#include <linux/completion.h>
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#include <linux/mmu_notifier.h>
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/*
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* On output:
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* 0 - The page is faultable and a future call with
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* HMM_PFN_REQ_FAULT could succeed.
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* HMM_PFN_VALID - the pfn field points to a valid PFN. This PFN is at
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* least readable. If dev_private_owner is !NULL then this could
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* point at a DEVICE_PRIVATE page.
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* HMM_PFN_WRITE - if the page memory can be written to (requires HMM_PFN_VALID)
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* HMM_PFN_ERROR - accessing the pfn is impossible and the device should
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* fail. ie poisoned memory, special pages, no vma, etc
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*
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* On input:
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* 0 - Return the current state of the page, do not fault it.
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* HMM_PFN_REQ_FAULT - The output must have HMM_PFN_VALID or hmm_range_fault()
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* will fail
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* HMM_PFN_REQ_WRITE - The output must have HMM_PFN_WRITE or hmm_range_fault()
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* will fail. Must be combined with HMM_PFN_REQ_FAULT.
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*/
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enum hmm_pfn_flags {
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/* Output flags */
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HMM_PFN_VALID = 1UL << (BITS_PER_LONG - 1),
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HMM_PFN_WRITE = 1UL << (BITS_PER_LONG - 2),
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HMM_PFN_ERROR = 1UL << (BITS_PER_LONG - 3),
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/* Input flags */
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HMM_PFN_REQ_FAULT = HMM_PFN_VALID,
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HMM_PFN_REQ_WRITE = HMM_PFN_WRITE,
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HMM_PFN_FLAGS = HMM_PFN_VALID | HMM_PFN_WRITE | HMM_PFN_ERROR,
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};
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/*
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* hmm_pfn_to_page() - return struct page pointed to by a device entry
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*
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* This must be called under the caller 'user_lock' after a successful
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* mmu_interval_read_begin(). The caller must have tested for HMM_PFN_VALID
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* already.
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*/
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static inline struct page *hmm_pfn_to_page(unsigned long hmm_pfn)
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{
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return pfn_to_page(hmm_pfn & ~HMM_PFN_FLAGS);
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}
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/*
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* struct hmm_range - track invalidation lock on virtual address range
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*
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* @notifier: a mmu_interval_notifier that includes the start/end
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* @notifier_seq: result of mmu_interval_read_begin()
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* @start: range virtual start address (inclusive)
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* @end: range virtual end address (exclusive)
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* @hmm_pfns: array of pfns (big enough for the range)
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* @default_flags: default flags for the range (write, read, ... see hmm doc)
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* @pfn_flags_mask: allows to mask pfn flags so that only default_flags matter
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* @dev_private_owner: owner of device private pages
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*/
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struct hmm_range {
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struct mmu_interval_notifier *notifier;
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unsigned long notifier_seq;
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unsigned long start;
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unsigned long end;
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unsigned long *hmm_pfns;
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unsigned long default_flags;
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unsigned long pfn_flags_mask;
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void *dev_private_owner;
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};
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/*
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* Please see Documentation/vm/hmm.rst for how to use the range API.
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*/
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int hmm_range_fault(struct hmm_range *range);
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/*
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* HMM_RANGE_DEFAULT_TIMEOUT - default timeout (ms) when waiting for a range
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*
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* When waiting for mmu notifiers we need some kind of time out otherwise we
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* could potentialy wait for ever, 1000ms ie 1s sounds like a long time to
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* wait already.
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*/
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#define HMM_RANGE_DEFAULT_TIMEOUT 1000
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#endif /* LINUX_HMM_H */
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