@@ -647,6 +647,36 @@ out:
return ret;
}
+static int memory_regain_ownership(struct dmm_map_object *map_obj,
+ unsigned long start, ssize_t len, enum dma_data_direction dir)
+{
+ int ret = 0;
+ unsigned long first_data_page = start >> PAGE_SHIFT;
+ unsigned long last_data_page = ((u32)(start + len - 1) >> PAGE_SHIFT);
+ /* calculating the number of pages this area spans */
+ unsigned long num_pages = last_data_page - first_data_page + 1;
+ struct bridge_dma_map_info *dma_info = &map_obj->dma_info;
+
+ if (!dma_info->sg)
+ goto out;
+
+ if (dma_info->dir != dir || dma_info->num_pages != num_pages) {
+ pr_err("%s: dma info doesn't match given params\n", __func__);
+ return -EINVAL;
+ }
+
+ dma_unmap_sg(bridge, dma_info->sg, num_pages, dma_info->dir);
+
+ pr_debug("%s: dma_map_sg unmapped\n", __func__);
+
+ kfree(dma_info->sg);
+
+ map_obj->dma_info.sg = NULL;
+
+out:
+ return ret;
+}
+
/* Cache operation against kernel address instead of users */
static int memory_give_ownership(struct dmm_map_object *map_obj,
unsigned long start, ssize_t len, enum dma_data_direction dir)
@@ -743,6 +773,44 @@ err_out:
return status;
}
+static int proc_end_dma(void *hprocessor, void *pmpu_addr, u32 ul_size,
+ enum dma_data_direction dir)
+{
+ /* Keep STATUS here for future additions to this function */
+ int status = 0;
+ struct process_context *pr_ctxt = (struct process_context *) hprocessor;
+ struct dmm_map_object *map_obj;
+
+ DBC_REQUIRE(refs > 0);
+
+ if (!pr_ctxt) {
+ status = -EFAULT;
+ goto err_out;
+ }
+
+ pr_debug("%s: addr 0x%x, size 0x%x, type %d\n", __func__,
+ (u32)pmpu_addr,
+ ul_size, dir);
+
+ /* find requested memory are in cached mapping information */
+ map_obj = find_containing_mapping(pr_ctxt, (u32) pmpu_addr, ul_size);
+ if (!map_obj) {
+ pr_err("%s: find_containing_mapping failed\n", __func__);
+ status = -EFAULT;
+ goto err_out;
+ }
+
+ if (memory_regain_ownership(map_obj, (u32) pmpu_addr, ul_size, dir)) {
+ pr_err("%s: InValid address parameters %p %x\n",
+ __func__, pmpu_addr, ul_size);
+ status = -EFAULT;
+ goto err_out;
+ }
+
+err_out:
+ return status;
+}
+
/*
* ======== proc_flush_memory ========
* Purpose: