diff options
| author | Wu Hao <hao.wu@intel.com> | 2018-06-30 08:53:35 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-15 13:55:47 +0200 |
| commit | fa8dda1edef9ebc3af467c644c5533ac97171e12 (patch) | |
| tree | 967916a0db830844d520da691e6b78d4de5748f8 /drivers/fpga/dfl-afu.h | |
| parent | 857a26222ff75eecf7d701ef0e91e4fbf6efa663 (diff) | |
fpga: dfl: afu: add DFL_FPGA_PORT_DMA_MAP/UNMAP ioctls support
DMA memory regions are required for Accelerated Function Unit (AFU) usage.
These two ioctls allow user space applications to map user memory regions
for dma, and unmap them after use. Iova is returned from driver to user
space application via DFL_FPGA_PORT_DMA_MAP ioctl. Application needs to
unmap it after use, otherwise, driver will unmap them in device file
release operation.
Each AFU has its own rb tree to keep track of its mapped DMA regions.
Ioctl interfaces:
* DFL_FPGA_PORT_DMA_MAP
Do the dma mapping per user_addr and length provided by user.
Return iova in provided struct dfl_fpga_port_dma_map.
* DFL_FPGA_PORT_DMA_UNMAP
Unmap the dma region per iova provided by user.
Signed-off-by: Tim Whisonant <tim.whisonant@intel.com>
Signed-off-by: Enno Luebbers <enno.luebbers@intel.com>
Signed-off-by: Shiva Rao <shiva.rao@intel.com>
Signed-off-by: Christopher Rauer <christopher.rauer@intel.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
Acked-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/fpga/dfl-afu.h')
| -rw-r--r-- | drivers/fpga/dfl-afu.h | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/drivers/fpga/dfl-afu.h b/drivers/fpga/dfl-afu.h index 11ce2cf99759..0c7630ae3cda 100644 --- a/drivers/fpga/dfl-afu.h +++ b/drivers/fpga/dfl-afu.h @@ -41,11 +41,31 @@ struct dfl_afu_mmio_region { }; /** + * struct fpga_afu_dma_region - afu DMA region data structure + * + * @user_addr: region userspace virtual address. + * @length: region length. + * @iova: region IO virtual address. + * @pages: ptr to pages of this region. + * @node: rb tree node. + * @in_use: flag to indicate if this region is in_use. + */ +struct dfl_afu_dma_region { + u64 user_addr; + u64 length; + u64 iova; + struct page **pages; + struct rb_node node; + bool in_use; +}; + +/** * struct dfl_afu - afu device data structure * * @region_cur_offset: current region offset from start to the device fd. * @num_regions: num of mmio regions. * @regions: the mmio region linked list of this afu feature device. + * @dma_regions: root of dma regions rb tree. * @num_umsgs: num of umsgs. * @pdata: afu platform device's pdata. */ @@ -54,6 +74,7 @@ struct dfl_afu { int num_regions; u8 num_umsgs; struct list_head regions; + struct rb_root dma_regions; struct dfl_feature_platform_data *pdata; }; @@ -68,4 +89,12 @@ int afu_mmio_region_get_by_index(struct dfl_feature_platform_data *pdata, int afu_mmio_region_get_by_offset(struct dfl_feature_platform_data *pdata, u64 offset, u64 size, struct dfl_afu_mmio_region *pregion); -#endif +void afu_dma_region_init(struct dfl_feature_platform_data *pdata); +void afu_dma_region_destroy(struct dfl_feature_platform_data *pdata); +int afu_dma_map_region(struct dfl_feature_platform_data *pdata, + u64 user_addr, u64 length, u64 *iova); +int afu_dma_unmap_region(struct dfl_feature_platform_data *pdata, u64 iova); +struct dfl_afu_dma_region * +afu_dma_region_find(struct dfl_feature_platform_data *pdata, + u64 iova, u64 size); +#endif /* __DFL_AFU_H */ |