Message-ID: <20200615203725.GP2723@paulmck-ThinkPad-P72>
Date:   Mon, 15 Jun 2020 13:37:25 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Andrea Parri <parri.andrea@...il.com>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Nicholas Piggin <npiggin@...il.com>,
        David Howells <dhowells@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        Luc Maranget <luc.maranget@...ia.fr>,
        Akira Yokosawa <akiyks@...il.com>,
        Daniel Lustig <dlustig@...dia.com>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>, linux-pci@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-parisc@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-media@...r.kernel.org
Subject: Re: [PATCH 26/29] docs: fix references for DMA*.txt files

On Mon, Jun 15, 2020 at 08:47:05AM +0200, Mauro Carvalho Chehab wrote:
> As we moved those files to core-api, fix references to point
> to their newer locations.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> ---
>  Documentation/PCI/pci.rst                          |  6 +++---
>  Documentation/block/biodoc.rst                     |  2 +-
>  Documentation/core-api/bus-virt-phys-mapping.rst   |  2 +-
>  Documentation/core-api/dma-api.rst                 |  6 +++---
>  Documentation/core-api/dma-isa-lpc.rst             |  2 +-
>  Documentation/driver-api/usb/dma.rst               |  6 +++---
>  Documentation/memory-barriers.txt                  |  6 +++---

I grabbed this Documentation/memory-barriers.txt, but can drop it if
Jon takes the whole batch, in which case:

Acked-by: Paul E. McKenney <paulmck@...nel.org> # from LKMM perspective

>  .../translations/ko_KR/memory-barriers.txt         |  6 +++---
>  arch/ia64/hp/common/sba_iommu.c                    | 12 ++++++------
>  arch/parisc/kernel/pci-dma.c                       |  2 +-
>  arch/x86/include/asm/dma-mapping.h                 |  4 ++--
>  arch/x86/kernel/amd_gart_64.c                      |  2 +-
>  drivers/parisc/sba_iommu.c                         | 14 +++++++-------
>  include/linux/dma-mapping.h                        |  2 +-
>  include/media/videobuf-dma-sg.h                    |  2 +-
>  kernel/dma/debug.c                                 |  2 +-
>  16 files changed, 38 insertions(+), 38 deletions(-)
> 
> diff --git a/Documentation/PCI/pci.rst b/Documentation/PCI/pci.rst
> index 8c016d8c9862..d10d3fe604c5 100644
> --- a/Documentation/PCI/pci.rst
> +++ b/Documentation/PCI/pci.rst
> @@ -265,7 +265,7 @@ Set the DMA mask size
>  ---------------------
>  .. note::
>     If anything below doesn't make sense, please refer to
> -   Documentation/DMA-API.txt. This section is just a reminder that
> +   :doc:`/core-api/dma-api`. This section is just a reminder that
>     drivers need to indicate DMA capabilities of the device and is not
>     an authoritative source for DMA interfaces.
>  
> @@ -291,7 +291,7 @@ Many 64-bit "PCI" devices (before PCI-X) and some PCI-X devices are
>  Setup shared control data
>  -------------------------
>  Once the DMA masks are set, the driver can allocate "consistent" (a.k.a. shared)
> -memory.  See Documentation/DMA-API.txt for a full description of
> +memory.  See :doc:`/core-api/dma-api` for a full description of
>  the DMA APIs. This section is just a reminder that it needs to be done
>  before enabling DMA on the device.
>  
> @@ -421,7 +421,7 @@ owners if there is one.
>  
>  Then clean up "consistent" buffers which contain the control data.
>  
> -See Documentation/DMA-API.txt for details on unmapping interfaces.
> +See :doc:`/core-api/dma-api` for details on unmapping interfaces.
>  
>  
>  Unregister from other subsystems
> diff --git a/Documentation/block/biodoc.rst b/Documentation/block/biodoc.rst
> index b964796ec9c7..ba7f45d0271c 100644
> --- a/Documentation/block/biodoc.rst
> +++ b/Documentation/block/biodoc.rst
> @@ -196,7 +196,7 @@ a virtual address mapping (unlike the earlier scheme of virtual address
>  do not have a corresponding kernel virtual address space mapping) and
>  low-memory pages.
>  
> -Note: Please refer to Documentation/DMA-API-HOWTO.txt for a discussion
> +Note: Please refer to :doc:`/core-api/dma-api-howto` for a discussion
>  on PCI high mem DMA aspects and mapping of scatter gather lists, and support
>  for 64 bit PCI.
>  
> diff --git a/Documentation/core-api/bus-virt-phys-mapping.rst b/Documentation/core-api/bus-virt-phys-mapping.rst
> index 4bb07c2f3e7d..c7bc99cd2e21 100644
> --- a/Documentation/core-api/bus-virt-phys-mapping.rst
> +++ b/Documentation/core-api/bus-virt-phys-mapping.rst
> @@ -8,7 +8,7 @@ How to access I/O mapped memory from within device drivers
>  
>  	The virt_to_bus() and bus_to_virt() functions have been
>  	superseded by the functionality provided by the PCI DMA interface
> -	(see Documentation/DMA-API-HOWTO.txt).  They continue
> +	(see :doc:`/core-api/dma-api-howto`).  They continue
>  	to be documented below for historical purposes, but new code
>  	must not use them. --davidm 00/12/12
>  
> diff --git a/Documentation/core-api/dma-api.rst b/Documentation/core-api/dma-api.rst
> index 2d8d2fed7317..63b4a2f20867 100644
> --- a/Documentation/core-api/dma-api.rst
> +++ b/Documentation/core-api/dma-api.rst
> @@ -5,7 +5,7 @@ Dynamic DMA mapping using the generic device
>  :Author: James E.J. Bottomley <James.Bottomley@...senPartnership.com>
>  
>  This document describes the DMA API.  For a more gentle introduction
> -of the API (and actual examples), see Documentation/DMA-API-HOWTO.txt.
> +of the API (and actual examples), see :doc:`/core-api/dma-api-howto`.
>  
>  This API is split into two pieces.  Part I describes the basic API.
>  Part II describes extensions for supporting non-consistent memory
> @@ -471,7 +471,7 @@ without the _attrs suffixes, except that they pass an optional
>  dma_attrs.
>  
>  The interpretation of DMA attributes is architecture-specific, and
> -each attribute should be documented in Documentation/DMA-attributes.txt.
> +each attribute should be documented in :doc:`/core-api/dma-attributes`.
>  
>  If dma_attrs are 0, the semantics of each of these functions
>  is identical to those of the corresponding function
> @@ -484,7 +484,7 @@ for DMA::
>  
>  	#include <linux/dma-mapping.h>
>  	/* DMA_ATTR_FOO should be defined in linux/dma-mapping.h and
> -	* documented in Documentation/DMA-attributes.txt */
> +	* documented in Documentation/core-api/dma-attributes.rst */
>  	...
>  
>  		unsigned long attr;
> diff --git a/Documentation/core-api/dma-isa-lpc.rst b/Documentation/core-api/dma-isa-lpc.rst
> index b1ec7b16c21f..e59a3d35a93d 100644
> --- a/Documentation/core-api/dma-isa-lpc.rst
> +++ b/Documentation/core-api/dma-isa-lpc.rst
> @@ -17,7 +17,7 @@ To do ISA style DMA you need to include two headers::
>  	#include <asm/dma.h>
>  
>  The first is the generic DMA API used to convert virtual addresses to
> -bus addresses (see Documentation/DMA-API.txt for details).
> +bus addresses (see :doc:`/core-api/dma-api` for details).
>  
>  The second contains the routines specific to ISA DMA transfers. Since
>  this is not present on all platforms make sure you construct your
> diff --git a/Documentation/driver-api/usb/dma.rst b/Documentation/driver-api/usb/dma.rst
> index 59d5aee89e37..2b3dbd3265b4 100644
> --- a/Documentation/driver-api/usb/dma.rst
> +++ b/Documentation/driver-api/usb/dma.rst
> @@ -10,7 +10,7 @@ API overview
>  
>  The big picture is that USB drivers can continue to ignore most DMA issues,
>  though they still must provide DMA-ready buffers (see
> -``Documentation/DMA-API-HOWTO.txt``).  That's how they've worked through
> +:doc:`/core-api/dma-api-howto`).  That's how they've worked through
>  the 2.4 (and earlier) kernels, or they can now be DMA-aware.
>  
>  DMA-aware usb drivers:
> @@ -60,7 +60,7 @@ and effects like cache-trashing can impose subtle penalties.
>    force a consistent memory access ordering by using memory barriers.  It's
>    not using a streaming DMA mapping, so it's good for small transfers on
>    systems where the I/O would otherwise thrash an IOMMU mapping.  (See
> -  ``Documentation/DMA-API-HOWTO.txt`` for definitions of "coherent" and
> +  :doc:`/core-api/dma-api-howto` for definitions of "coherent" and
>    "streaming" DMA mappings.)
>  
>    Asking for 1/Nth of a page (as well as asking for N pages) is reasonably
> @@ -91,7 +91,7 @@ Working with existing buffers
>  Existing buffers aren't usable for DMA without first being mapped into the
>  DMA address space of the device.  However, most buffers passed to your
>  driver can safely be used with such DMA mapping.  (See the first section
> -of Documentation/DMA-API-HOWTO.txt, titled "What memory is DMA-able?")
> +of :doc:`/core-api/dma-api-howto`, titled "What memory is DMA-able?")
>  
>  - When you're using scatterlists, you can map everything at once.  On some
>    systems, this kicks in an IOMMU and turns the scatterlists into single
> diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt
> index eaabc3134294..0e4947a8282d 100644
> --- a/Documentation/memory-barriers.txt
> +++ b/Documentation/memory-barriers.txt
> @@ -546,8 +546,8 @@ There are certain things that the Linux kernel memory barriers do not guarantee:
>  	[*] For information on bus mastering DMA and coherency please read:
>  
>  	    Documentation/driver-api/pci/pci.rst
> -	    Documentation/DMA-API-HOWTO.txt
> -	    Documentation/DMA-API.txt
> +	    Documentation/core-api/dma-api-howto.rst
> +	    Documentation/core-api/dma-api.rst
>  
>  
>  DATA DEPENDENCY BARRIERS (HISTORICAL)
> @@ -1932,7 +1932,7 @@ There are some more advanced barrier functions:
>       here.
>  
>       See the subsection "Kernel I/O barrier effects" for more information on
> -     relaxed I/O accessors and the Documentation/DMA-API.txt file for more
> +     relaxed I/O accessors and the Documentation/core-api/dma-api.rst file for more
>       information on consistent memory.
>  
>  
> diff --git a/Documentation/translations/ko_KR/memory-barriers.txt b/Documentation/translations/ko_KR/memory-barriers.txt
> index 34d041d68f78..604cee350e53 100644
> --- a/Documentation/translations/ko_KR/memory-barriers.txt
> +++ b/Documentation/translations/ko_KR/memory-barriers.txt
> @@ -570,8 +570,8 @@ ACQUIRE 는 해당 오퍼레이션의 로드 부분에만 적용되고 RELEASE 
>  	[*] 버스 마스터링 DMA 와 일관성에 대해서는 다음을 참고하시기 바랍니다:
>  
>  	    Documentation/driver-api/pci/pci.rst
> -	    Documentation/DMA-API-HOWTO.txt
> -	    Documentation/DMA-API.txt
> +	    Documentation/core-api/dma-api-howto.rst
> +	    Documentation/core-api/dma-api.rst
>  
>  
>  데이터 의존성 배리어 (역사적)
> @@ -1907,7 +1907,7 @@ Mandatory 배리어들은 SMP 시스템에서도 UP 시스템에서도 SMP 효
>  
>       writel_relaxed() 와 같은 완화된 I/O 접근자들에 대한 자세한 내용을 위해서는
>       "커널 I/O 배리어의 효과" 섹션을, consistent memory 에 대한 자세한 내용을
> -     위해선 Documentation/DMA-API.txt 문서를 참고하세요.
> +     위해선 Documentation/core-api/dma-api.rst 문서를 참고하세요.
>  
>  
>  =========================
> diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
> index a806227c1fad..656a4888c300 100644
> --- a/arch/ia64/hp/common/sba_iommu.c
> +++ b/arch/ia64/hp/common/sba_iommu.c
> @@ -907,7 +907,7 @@ sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
>   * @dir: dma direction
>   * @attrs: optional dma attributes
>   *
> - * See Documentation/DMA-API-HOWTO.txt
> + * See Documentation/core-api/dma-api-howto.rst
>   */
>  static dma_addr_t sba_map_page(struct device *dev, struct page *page,
>  			       unsigned long poff, size_t size,
> @@ -1028,7 +1028,7 @@ sba_mark_clean(struct ioc *ioc, dma_addr_t iova, size_t size)
>   * @dir:  R/W or both.
>   * @attrs: optional dma attributes
>   *
> - * See Documentation/DMA-API-HOWTO.txt
> + * See Documentation/core-api/dma-api-howto.rst
>   */
>  static void sba_unmap_page(struct device *dev, dma_addr_t iova, size_t size,
>  			   enum dma_data_direction dir, unsigned long attrs)
> @@ -1105,7 +1105,7 @@ static void sba_unmap_page(struct device *dev, dma_addr_t iova, size_t size,
>   * @size:  number of bytes mapped in driver buffer.
>   * @dma_handle:  IOVA of new buffer.
>   *
> - * See Documentation/DMA-API-HOWTO.txt
> + * See Documentation/core-api/dma-api-howto.rst
>   */
>  static void *
>  sba_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
> @@ -1162,7 +1162,7 @@ sba_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
>   * @vaddr:  virtual address IOVA of "consistent" buffer.
>   * @dma_handler:  IO virtual address of "consistent" buffer.
>   *
> - * See Documentation/DMA-API-HOWTO.txt
> + * See Documentation/core-api/dma-api-howto.rst
>   */
>  static void sba_free_coherent(struct device *dev, size_t size, void *vaddr,
>  			      dma_addr_t dma_handle, unsigned long attrs)
> @@ -1425,7 +1425,7 @@ static void sba_unmap_sg_attrs(struct device *dev, struct scatterlist *sglist,
>   * @dir:  R/W or both.
>   * @attrs: optional dma attributes
>   *
> - * See Documentation/DMA-API-HOWTO.txt
> + * See Documentation/core-api/dma-api-howto.rst
>   */
>  static int sba_map_sg_attrs(struct device *dev, struct scatterlist *sglist,
>  			    int nents, enum dma_data_direction dir,
> @@ -1524,7 +1524,7 @@ static int sba_map_sg_attrs(struct device *dev, struct scatterlist *sglist,
>   * @dir:  R/W or both.
>   * @attrs: optional dma attributes
>   *
> - * See Documentation/DMA-API-HOWTO.txt
> + * See Documentation/core-api/dma-api-howto.rst
>   */
>  static void sba_unmap_sg_attrs(struct device *dev, struct scatterlist *sglist,
>  			       int nents, enum dma_data_direction dir,
> diff --git a/arch/parisc/kernel/pci-dma.c b/arch/parisc/kernel/pci-dma.c
> index 70cd24bdcfec..4f1596bb1936 100644
> --- a/arch/parisc/kernel/pci-dma.c
> +++ b/arch/parisc/kernel/pci-dma.c
> @@ -3,7 +3,7 @@
>  ** PARISC 1.1 Dynamic DMA mapping support.
>  ** This implementation is for PA-RISC platforms that do not support
>  ** I/O TLBs (aka DMA address translation hardware).
> -** See Documentation/DMA-API-HOWTO.txt for interface definitions.
> +** See Documentation/core-api/dma-api-howto.rst for interface definitions.
>  **
>  **      (c) Copyright 1999,2000 Hewlett-Packard Company
>  **      (c) Copyright 2000 Grant Grundler
> diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
> index 6b15a24930e0..fed67eafcacc 100644
> --- a/arch/x86/include/asm/dma-mapping.h
> +++ b/arch/x86/include/asm/dma-mapping.h
> @@ -3,8 +3,8 @@
>  #define _ASM_X86_DMA_MAPPING_H
>  
>  /*
> - * IOMMU interface. See Documentation/DMA-API-HOWTO.txt and
> - * Documentation/DMA-API.txt for documentation.
> + * IOMMU interface. See Documentation/core-api/dma-api-howto.rst and
> + * Documentation/core-api/dma-api.rst for documentation.
>   */
>  
>  #include <linux/scatterlist.h>
> diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
> index 17cb5b933dcf..e89031e9c847 100644
> --- a/arch/x86/kernel/amd_gart_64.c
> +++ b/arch/x86/kernel/amd_gart_64.c
> @@ -6,7 +6,7 @@
>   * This allows to use PCI devices that only support 32bit addresses on systems
>   * with more than 4GB.
>   *
> - * See Documentation/DMA-API-HOWTO.txt for the interface specification.
> + * See Documentation/core-api/dma-api-howto.rst for the interface specification.
>   *
>   * Copyright 2002 Andi Kleen, SuSE Labs.
>   */
> diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c
> index 7e112829d250..5368452eb5a6 100644
> --- a/drivers/parisc/sba_iommu.c
> +++ b/drivers/parisc/sba_iommu.c
> @@ -666,7 +666,7 @@ sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
>   * @dev: instance of PCI owned by the driver that's asking
>   * @mask:  number of address bits this PCI device can handle
>   *
> - * See Documentation/DMA-API-HOWTO.txt
> + * See Documentation/core-api/dma-api-howto.rst
>   */
>  static int sba_dma_supported( struct device *dev, u64 mask)
>  {
> @@ -698,7 +698,7 @@ static int sba_dma_supported( struct device *dev, u64 mask)
>   * @size:  number of bytes to map in driver buffer.
>   * @direction:  R/W or both.
>   *
> - * See Documentation/DMA-API-HOWTO.txt
> + * See Documentation/core-api/dma-api-howto.rst
>   */
>  static dma_addr_t
>  sba_map_single(struct device *dev, void *addr, size_t size,
> @@ -788,7 +788,7 @@ sba_map_page(struct device *dev, struct page *page, unsigned long offset,
>   * @size:  number of bytes mapped in driver buffer.
>   * @direction:  R/W or both.
>   *
> - * See Documentation/DMA-API-HOWTO.txt
> + * See Documentation/core-api/dma-api-howto.rst
>   */
>  static void
>  sba_unmap_page(struct device *dev, dma_addr_t iova, size_t size,
> @@ -867,7 +867,7 @@ sba_unmap_page(struct device *dev, dma_addr_t iova, size_t size,
>   * @size:  number of bytes mapped in driver buffer.
>   * @dma_handle:  IOVA of new buffer.
>   *
> - * See Documentation/DMA-API-HOWTO.txt
> + * See Documentation/core-api/dma-api-howto.rst
>   */
>  static void *sba_alloc(struct device *hwdev, size_t size, dma_addr_t *dma_handle,
>  		gfp_t gfp, unsigned long attrs)
> @@ -898,7 +898,7 @@ static void *sba_alloc(struct device *hwdev, size_t size, dma_addr_t *dma_handle
>   * @vaddr:  virtual address IOVA of "consistent" buffer.
>   * @dma_handler:  IO virtual address of "consistent" buffer.
>   *
> - * See Documentation/DMA-API-HOWTO.txt
> + * See Documentation/core-api/dma-api-howto.rst
>   */
>  static void
>  sba_free(struct device *hwdev, size_t size, void *vaddr,
> @@ -933,7 +933,7 @@ int dump_run_sg = 0;
>   * @nents:  number of entries in list
>   * @direction:  R/W or both.
>   *
> - * See Documentation/DMA-API-HOWTO.txt
> + * See Documentation/core-api/dma-api-howto.rst
>   */
>  static int
>  sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
> @@ -1017,7 +1017,7 @@ sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
>   * @nents:  number of entries in list
>   * @direction:  R/W or both.
>   *
> - * See Documentation/DMA-API-HOWTO.txt
> + * See Documentation/core-api/dma-api-howto.rst
>   */
>  static void 
>  sba_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,
> diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
> index 78f677cf45ab..ef2b153ddbd9 100644
> --- a/include/linux/dma-mapping.h
> +++ b/include/linux/dma-mapping.h
> @@ -14,7 +14,7 @@
>  
>  /**
>   * List of possible attributes associated with a DMA mapping. The semantics
> - * of each attribute should be defined in Documentation/DMA-attributes.txt.
> + * of each attribute should be defined in Documentation/core-api/dma-attributes.rst.
>   */
>  
>  /*
> diff --git a/include/media/videobuf-dma-sg.h b/include/media/videobuf-dma-sg.h
> index b89d5e31f172..34450f7ad510 100644
> --- a/include/media/videobuf-dma-sg.h
> +++ b/include/media/videobuf-dma-sg.h
> @@ -31,7 +31,7 @@
>   *	does memory allocation too using vmalloc_32().
>   *
>   * videobuf_dma_*()
> - *	see Documentation/DMA-API-HOWTO.txt, these functions to
> + *	see Documentation/core-api/dma-api-howto.rst, these functions to
>   *	basically the same.  The map function does also build a
>   *	scatterlist for the buffer (and unmap frees it ...)
>   *
> diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
> index 36c962a86bf2..f97f088ace7e 100644
> --- a/kernel/dma/debug.c
> +++ b/kernel/dma/debug.c
> @@ -1071,7 +1071,7 @@ static void check_unmap(struct dma_debug_entry *ref)
>  	/*
>  	 * Drivers should use dma_mapping_error() to check the returned
>  	 * addresses of dma_map_single() and dma_map_page().
> -	 * If not, print this warning message. See Documentation/DMA-API.txt.
> +	 * If not, print this warning message. See Documentation/core-api/dma-api.rst.
>  	 */
>  	if (entry->map_err_type == MAP_ERR_NOT_CHECKED) {
>  		err_printk(ref->dev, entry,
> -- 
> 2.26.2
> 

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