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-rw-r--r--drivers/fpga/dfl-afu-region.c167
1 files changed, 167 insertions, 0 deletions
diff --git a/drivers/fpga/dfl-afu-region.c b/drivers/fpga/dfl-afu-region.c
new file mode 100644
index 0000000000..2e7b416294
--- /dev/null
+++ b/drivers/fpga/dfl-afu-region.c
@@ -0,0 +1,167 @@
+// 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.
+ *
+ * @pdata: afu platform device's pdata.
+ * @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(&region->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;
+}