mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-08-28 00:19:36 +00:00
8cad471305
HMM callers use PFN list to populate range while calling to hmm_range_fault(), the conversion from PFN to DMA address is done by the callers with help of another DMA list. However, it is wasteful on any modern platform and by doing the right logic, that DMA list can be avoided. Provide generic logic to manage these lists and gave an interface to map/unmap PFNs to DMA addresses, without requiring from the callers to be an experts in DMA core API. Tested-by: Jens Axboe <axboe@kernel.dk> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
34 lines
1012 B
C
34 lines
1012 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/* Copyright (c) 2024 NVIDIA Corporation & Affiliates */
|
|
#ifndef LINUX_HMM_DMA_H
|
|
#define LINUX_HMM_DMA_H
|
|
|
|
#include <linux/dma-mapping.h>
|
|
|
|
struct dma_iova_state;
|
|
struct pci_p2pdma_map_state;
|
|
|
|
/*
|
|
* struct hmm_dma_map - array of PFNs and DMA addresses
|
|
*
|
|
* @state: DMA IOVA state
|
|
* @pfns: array of PFNs
|
|
* @dma_list: array of DMA addresses
|
|
* @dma_entry_size: size of each DMA entry in the array
|
|
*/
|
|
struct hmm_dma_map {
|
|
struct dma_iova_state state;
|
|
unsigned long *pfn_list;
|
|
dma_addr_t *dma_list;
|
|
size_t dma_entry_size;
|
|
};
|
|
|
|
int hmm_dma_map_alloc(struct device *dev, struct hmm_dma_map *map,
|
|
size_t nr_entries, size_t dma_entry_size);
|
|
void hmm_dma_map_free(struct device *dev, struct hmm_dma_map *map);
|
|
dma_addr_t hmm_dma_map_pfn(struct device *dev, struct hmm_dma_map *map,
|
|
size_t idx,
|
|
struct pci_p2pdma_map_state *p2pdma_state);
|
|
bool hmm_dma_unmap_pfn(struct device *dev, struct hmm_dma_map *map, size_t idx);
|
|
#endif /* LINUX_HMM_DMA_H */
|