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received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: MDxOGLHBtqpx+ZiUv2yY/8G/NH09ljTyrtXcV3DzcmpfJv2XT50FbGdU0GSbjU3moEsMnZuPkWO98lZxRCFamfPvSjIHfbGB+mSHEn7CHqKRauSBVWdDqwfTRagli9nWrep7OrVWasZSY2/B/tE0ZadItxRm2BN7EmKLE492ujR0OMj58d0sXvvgHVCdgWNcF0EsYQ8hwKzeauUdirHpboPqxsHZC4b65xt/MCVDcjjhHbfXw5CL6Ge2yPlgEJi+9lMVzpVvFwszd+VuUteB5CLI2TBbyMnA3s3SpuxaBueyrcKSJqG3aF3arxI0vdQs0YnC77i02wMEdD93395utiiI5IU5hUan2nIfYjTVx3KUMZr5YAyDkFG9FzqduToeGubXEz1+YAjMORc333UOnJ3X5JtYt3d39pT/sYdsUxXcJ+NHAPRs++ZMagXl60FC Content-Type: text/plain; charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: f11b17da-f791-4a9e-fa40-08d7587f854e X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Oct 2019 12:41:41.9069 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: hF0RoxaKnWbBDFqnLfkQUa3qvd8Dl6vhuUnDvAunxOMWvpXP2zyDXMNhN4F3eXCTFFnw2El2tahaxiRi4RU2pw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR04MB4701 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Laurentiu Tudor Introduce a few new dma unmap and sync variants that, on top of the original variants, return the virtual address corresponding to the input dma address. In order to implement this a new dma map op is added and used: void *get_virt_addr(dev, dma_handle); It does the actual conversion of an input dma address to the output virtual address. Signed-off-by: Laurentiu Tudor --- include/linux/dma-mapping.h | 55 +++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 4a1c4fca475a..ae7bb8a84b9d 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -132,6 +132,7 @@ struct dma_map_ops { u64 (*get_required_mask)(struct device *dev); size_t (*max_mapping_size)(struct device *dev); unsigned long (*get_merge_boundary)(struct device *dev); + void *(*get_virt_addr)(struct device *dev, dma_addr_t dma_handle); }; =20 #define DMA_MAPPING_ERROR (~(dma_addr_t)0) @@ -304,6 +305,21 @@ static inline void dma_unmap_page_attrs(struct device = *dev, dma_addr_t addr, debug_dma_unmap_page(dev, addr, size, dir); } =20 +static inline struct page * +dma_unmap_page_attrs_desc(struct device *dev, dma_addr_t addr, size_t size= , + enum dma_data_direction dir, unsigned long attrs) +{ + const struct dma_map_ops *ops =3D get_dma_ops(dev); + void *ptr =3D NULL; + + if (ops && ops->get_virt_addr) + ptr =3D ops->get_virt_addr(dev, addr); + + dma_unmap_page_attrs(dev, addr, size, dir, attrs); + + return ptr ? virt_to_page(ptr) : NULL; +} + /* * dma_maps_sg_attrs returns 0 on error and > 0 on success. * It should never return a value < 0. @@ -390,6 +406,21 @@ static inline void dma_sync_single_for_cpu(struct devi= ce *dev, dma_addr_t addr, debug_dma_sync_single_for_cpu(dev, addr, size, dir); } =20 +static inline void * +dma_sync_single_for_cpu_desc(struct device *dev, dma_addr_t addr, size_t s= ize, + enum dma_data_direction dir) +{ + const struct dma_map_ops *ops =3D get_dma_ops(dev); + void *ptr =3D NULL; + + if (ops && ops->get_virt_addr) + ptr =3D ops->get_virt_addr(dev, addr); + + dma_sync_single_for_cpu(dev, addr, size, dir); + + return ptr; +} + static inline void dma_sync_single_for_device(struct device *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir) @@ -500,6 +531,12 @@ static inline void dma_sync_single_for_cpu(struct devi= ce *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir) { } + +static inline void * +dma_sync_single_for_cpu_desc(struct device *dev, dma_addr_t addr, size_t s= ize, + enum dma_data_direction dir) +{ +} static inline void dma_sync_single_for_device(struct device *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir) { @@ -594,6 +631,21 @@ static inline void dma_unmap_single_attrs(struct devic= e *dev, dma_addr_t addr, return dma_unmap_page_attrs(dev, addr, size, dir, attrs); } =20 +static inline void * +dma_unmap_single_attrs_desc(struct device *dev, dma_addr_t addr, size_t si= ze, + enum dma_data_direction dir, unsigned long attrs) +{ + const struct dma_map_ops *ops =3D get_dma_ops(dev); + void *ptr =3D NULL; + + if (ops && ops->get_virt_addr) + ptr =3D ops->get_virt_addr(dev, addr); + + dma_unmap_single_attrs(dev, addr, size, dir, attrs); + + return ptr; +} + static inline void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t addr, unsigned long offset, size_t size, enum dma_data_direction dir) @@ -610,10 +662,13 @@ static inline void dma_sync_single_range_for_device(s= truct device *dev, =20 #define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0) #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0) +#define dma_unmap_single_desc(d, a, s, r) \ + dma_unmap_single_attrs_desc(d, a, s, r, 0) #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0) #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0) #define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0) #define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0) +#define dma_unmap_page_desc(d, a, s, r) dma_unmap_page_attrs_desc(d, a, s,= r, 0) #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s= , 0) #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0) =20 --=20 2.17.1