diff options
Diffstat (limited to 'drivers/fpga/dfl-afu-region.c')
| -rw-r--r-- | drivers/fpga/dfl-afu-region.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/drivers/fpga/dfl-afu-region.c b/drivers/fpga/dfl-afu-region.c new file mode 100644 index 000000000..0804b7a0c --- /dev/null +++ b/drivers/fpga/dfl-afu-region.c @@ -0,0 +1,166 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for FPGA Accelerated Function Unit (AFU) MMIO Region Management + * + * Copyright (C) 2017-2018 Intel Corporation, Inc. + * + * Authors: + * Wu Hao <hao.wu@intel.com> + * Xiao Guangrong <guangrong.xiao@linux.intel.com> + */ +#include "dfl-afu.h" + +/** + * afu_mmio_region_init - init function for afu mmio region support + * @pdata: afu platform device's pdata. + */ +void afu_mmio_region_init(struct dfl_feature_platform_data *pdata) +{ + struct dfl_afu *afu = dfl_fpga_pdata_get_private(pdata); + + INIT_LIST_HEAD(&afu->regions); +} + +#define for_each_region(region, afu) \ + list_for_each_entry((region), &(afu)->regions, node) + +static struct dfl_afu_mmio_region *get_region_by_index(struct dfl_afu *afu, + u32 region_index) +{ + struct dfl_afu_mmio_region *region; + + for_each_region(region, afu) + if (region->index == region_index) + return region; + + return NULL; +} + +/** + * afu_mmio_region_add - add a mmio region to given feature dev. + * + * @region_index: region index. + * @region_size: region size. + * @phys: region's physical address of this region. + * @flags: region flags (access permission). + * + * Return: 0 on success, negative error code otherwise. + */ +int afu_mmio_region_add(struct dfl_feature_platform_data *pdata, + u32 region_index, u64 region_size, u64 phys, u32 flags) +{ + struct dfl_afu_mmio_region *region; + struct dfl_afu *afu; + int ret = 0; + + region = devm_kzalloc(&pdata->dev->dev, sizeof(*region), GFP_KERNEL); + if (!region) + return -ENOMEM; + + region->index = region_index; + region->size = region_size; + region->phys = phys; + region->flags = flags; + + mutex_lock(&pdata->lock); + + afu = dfl_fpga_pdata_get_private(pdata); + + /* check if @index already exists */ + if (get_region_by_index(afu, region_index)) { + mutex_unlock(&pdata->lock); + ret = -EEXIST; + goto exit; + } + + region_size = PAGE_ALIGN(region_size); + region->offset = afu->region_cur_offset; + list_add(®ion->node, &afu->regions); + + afu->region_cur_offset += region_size; + afu->num_regions++; + mutex_unlock(&pdata->lock); + + return 0; + +exit: + devm_kfree(&pdata->dev->dev, region); + return ret; +} + +/** + * afu_mmio_region_destroy - destroy all mmio regions under given feature dev. + * @pdata: afu platform device's pdata. + */ +void afu_mmio_region_destroy(struct dfl_feature_platform_data *pdata) +{ + struct dfl_afu *afu = dfl_fpga_pdata_get_private(pdata); + struct dfl_afu_mmio_region *tmp, *region; + + list_for_each_entry_safe(region, tmp, &afu->regions, node) + devm_kfree(&pdata->dev->dev, region); +} + +/** + * afu_mmio_region_get_by_index - find an afu region by index. + * @pdata: afu platform device's pdata. + * @region_index: region index. + * @pregion: ptr to region for result. + * + * Return: 0 on success, negative error code otherwise. + */ +int afu_mmio_region_get_by_index(struct dfl_feature_platform_data *pdata, + u32 region_index, + struct dfl_afu_mmio_region *pregion) +{ + struct dfl_afu_mmio_region *region; + struct dfl_afu *afu; + int ret = 0; + + mutex_lock(&pdata->lock); + afu = dfl_fpga_pdata_get_private(pdata); + region = get_region_by_index(afu, region_index); + if (!region) { + ret = -EINVAL; + goto exit; + } + *pregion = *region; +exit: + mutex_unlock(&pdata->lock); + return ret; +} + +/** + * afu_mmio_region_get_by_offset - find an afu mmio region by offset and size + * + * @pdata: afu platform device's pdata. + * @offset: region offset from start of the device fd. + * @size: region size. + * @pregion: ptr to region for result. + * + * Find the region which fully contains the region described by input + * parameters (offset and size) from the feature dev's region linked list. + * + * Return: 0 on success, negative error code otherwise. + */ +int afu_mmio_region_get_by_offset(struct dfl_feature_platform_data *pdata, + u64 offset, u64 size, + struct dfl_afu_mmio_region *pregion) +{ + struct dfl_afu_mmio_region *region; + struct dfl_afu *afu; + int ret = 0; + + mutex_lock(&pdata->lock); + afu = dfl_fpga_pdata_get_private(pdata); + for_each_region(region, afu) + if (region->offset <= offset && + region->offset + region->size >= offset + size) { + *pregion = *region; + goto exit; + } + ret = -EINVAL; +exit: + mutex_unlock(&pdata->lock); + return ret; +} |