diff options
Diffstat (limited to 'drivers/infiniband/sw/rxe/rxe_dma.c')
| -rw-r--r-- | drivers/infiniband/sw/rxe/rxe_dma.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/drivers/infiniband/sw/rxe/rxe_dma.c b/drivers/infiniband/sw/rxe/rxe_dma.c new file mode 100644 index 0000000..7634c1a --- /dev/null +++ b/drivers/infiniband/sw/rxe/rxe_dma.c @@ -0,0 +1,166 @@ +/* + * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved. + * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include "rxe.h" +#include "rxe_loc.h" + +#define DMA_BAD_ADDER ((u64)0) + +static int rxe_mapping_error(struct ib_device *dev, u64 dma_addr) +{ + return dma_addr == DMA_BAD_ADDER; +} + +static u64 rxe_dma_map_single(struct ib_device *dev, + void *cpu_addr, size_t size, + enum dma_data_direction direction) +{ + WARN_ON(!valid_dma_direction(direction)); + return (uintptr_t)cpu_addr; +} + +static void rxe_dma_unmap_single(struct ib_device *dev, + u64 addr, size_t size, + enum dma_data_direction direction) +{ + WARN_ON(!valid_dma_direction(direction)); +} + +static u64 rxe_dma_map_page(struct ib_device *dev, + struct page *page, + unsigned long offset, + size_t size, enum dma_data_direction direction) +{ + u64 addr; + + WARN_ON(!valid_dma_direction(direction)); + + if (offset + size > PAGE_SIZE) { + addr = DMA_BAD_ADDER; + goto done; + } + + addr = (uintptr_t)page_address(page); + if (addr) + addr += offset; + +done: + return addr; +} + +static void rxe_dma_unmap_page(struct ib_device *dev, + u64 addr, size_t size, + enum dma_data_direction direction) +{ + WARN_ON(!valid_dma_direction(direction)); +} + +static int rxe_map_sg(struct ib_device *dev, struct scatterlist *sgl, + int nents, enum dma_data_direction direction) +{ + struct scatterlist *sg; + u64 addr; + int i; + int ret = nents; + + WARN_ON(!valid_dma_direction(direction)); + + for_each_sg(sgl, sg, nents, i) { + addr = (uintptr_t)page_address(sg_page(sg)); + if (!addr) { + ret = 0; + break; + } + sg->dma_address = addr + sg->offset; +#ifdef CONFIG_NEED_SG_DMA_LENGTH + sg->dma_length = sg->length; +#endif + } + + return ret; +} + +static void rxe_unmap_sg(struct ib_device *dev, + struct scatterlist *sg, int nents, + enum dma_data_direction direction) +{ + WARN_ON(!valid_dma_direction(direction)); +} + +static void rxe_sync_single_for_cpu(struct ib_device *dev, + u64 addr, + size_t size, enum dma_data_direction dir) +{ +} + +static void rxe_sync_single_for_device(struct ib_device *dev, + u64 addr, + size_t size, enum dma_data_direction dir) +{ +} + +static void *rxe_dma_alloc_coherent(struct ib_device *dev, size_t size, + u64 *dma_handle, gfp_t flag) +{ + struct page *p; + void *addr = NULL; + + p = alloc_pages(flag, get_order(size)); + if (p) + addr = page_address(p); + + if (dma_handle) + *dma_handle = (uintptr_t)addr; + + return addr; +} + +static void rxe_dma_free_coherent(struct ib_device *dev, size_t size, + void *cpu_addr, u64 dma_handle) +{ + free_pages((unsigned long)cpu_addr, get_order(size)); +} + +struct ib_dma_mapping_ops rxe_dma_mapping_ops = { + .mapping_error = rxe_mapping_error, + .map_single = rxe_dma_map_single, + .unmap_single = rxe_dma_unmap_single, + .map_page = rxe_dma_map_page, + .unmap_page = rxe_dma_unmap_page, + .map_sg = rxe_map_sg, + .unmap_sg = rxe_unmap_sg, + .sync_single_for_cpu = rxe_sync_single_for_cpu, + .sync_single_for_device = rxe_sync_single_for_device, + .alloc_coherent = rxe_dma_alloc_coherent, + .free_coherent = rxe_dma_free_coherent +}; |
