/*
* ======== dmm_un_reserve_memory ========
* Purpose:
* Free a chunk of reserved DSP/IVA address space.
*/
int dmm_un_reserve_memory(struct dmm_object *dmm_mgr, u32 rsv_addr)
{
struct dmm_object *dmm_obj = (struct dmm_object *)dmm_mgr;
struct map_page *chunk;
u32 i;
int status = 0;
u32 chunk_size;
spin_lock(&dmm_obj->dmm_lock);
/* Find the chunk containing the reserved address */
chunk = get_mapped_region(rsv_addr);
if (chunk == NULL)
status = -ENOENT;
if (!status) {
/* Free all the mapped pages for this reserved region */
i = 0;
while (i < chunk->region_size) {
if (chunk[i].mapped) {
/* Remove mapping from the page tables. */
chunk_size = chunk[i].mapped_size;
/* Clear the mapping flags */
chunk[i].mapped = false;
chunk[i].mapped_size = 0;
i += chunk_size;
} else
i++;
}
/* Clear the flags (mark the region 'free') */
chunk->reserved = false;
/* NOTE: We do NOT coalesce free regions here.
* Free regions are coalesced in get_region(), as it traverses
*the whole mapping table
*/
}
spin_unlock(&dmm_obj->dmm_lock);
dev_dbg(bridge, "%s: dmm_mgr %p, rsv_addr %x\n\tstatus %x chunk %p",
__func__, dmm_mgr, rsv_addr, status, chunk);
return status;
}
int dmm_un_reserve_memory(struct dmm_object *dmm_mgr, u32 rsv_addr)
{
struct dmm_object *dmm_obj = (struct dmm_object *)dmm_mgr;
struct map_page *chunk;
u32 i;
int status = 0;
u32 chunk_size;
spin_lock(&dmm_obj->dmm_lock);
/* */
chunk = get_mapped_region(rsv_addr);
if (chunk == NULL)
status = -ENOENT;
if (!status) {
/* */
i = 0;
while (i < chunk->region_size) {
if (chunk[i].mapped) {
/* */
chunk_size = chunk[i].mapped_size;
/* */
chunk[i].mapped = false;
chunk[i].mapped_size = 0;
i += chunk_size;
} else
i++;
}
/* */
chunk->reserved = false;
/*
*/
}
spin_unlock(&dmm_obj->dmm_lock);
dev_dbg(bridge, "%s: dmm_mgr %p, rsv_addr %x\n\tstatus %x chunk %p",
__func__, dmm_mgr, rsv_addr, status, chunk);
return status;
}
/*
* ======== dmm_un_map_memory ========
* Purpose:
* Remove the mapped block from the reserved chunk.
*/
int dmm_un_map_memory(struct dmm_object *dmm_mgr, u32 addr, u32 *psize)
{
struct dmm_object *dmm_obj = (struct dmm_object *)dmm_mgr;
struct map_page *chunk;
int status = 0;
spin_lock(&dmm_obj->dmm_lock);
chunk = get_mapped_region(addr);
if (chunk == NULL)
status = -ENOENT;
if (!status) {
/* Unmap the region */
*psize = chunk->mapped_size * PG_SIZE4K;
chunk->mapped = false;
chunk->mapped_size = 0;
}
spin_unlock(&dmm_obj->dmm_lock);
dev_dbg(bridge, "%s: dmm_mgr %p, addr %x, psize %p\n\tstatus %x, "
"chunk %p\n", __func__, dmm_mgr, addr, psize, status, chunk);
return status;
}
