msm: ocmem: Add support for low power clients
Add support for low power clients to map and unmap OCMEM buffers.
These operations trigger RDM transfers using the BR/DM core which
enables low power clients to migrate segments between main memory and
OCMEM.
Also add the required APIs for supporting eviction and
restoration of buffers.
Change-Id: I6b641510f8ef27da2b347d13af468a1ed6664c9e
Signed-off-by: Naveen Ramaraj <nramaraj@codeaurora.org>
diff --git a/arch/arm/mach-msm/ocmem_api.c b/arch/arm/mach-msm/ocmem_api.c
index bed13de..bb32fca 100644
--- a/arch/arm/mach-msm/ocmem_api.c
+++ b/arch/arm/mach-msm/ocmem_api.c
@@ -13,10 +13,8 @@
#include <linux/slab.h>
#include <mach/ocmem_priv.h>
-static inline int check_id(int id)
-{
- return (id < OCMEM_CLIENT_MAX && id >= OCMEM_GRAPHICS);
-}
+static DEFINE_MUTEX(ocmem_eviction_lock);
+static DECLARE_BITMAP(evicted, OCMEM_CLIENT_MAX);
static struct ocmem_handle *generate_handle(void)
{
@@ -61,6 +59,24 @@
return 0;
}
+static int __ocmem_shrink(int id, struct ocmem_buf *buf, unsigned long len)
+{
+ int ret = 0;
+ struct ocmem_handle *handle = buffer_to_handle(buf);
+
+ if (!handle)
+ return -EINVAL;
+
+ mutex_lock(&handle->handle_mutex);
+ ret = process_shrink(id, handle, len);
+ mutex_unlock(&handle->handle_mutex);
+
+ if (ret)
+ return -EINVAL;
+
+ return 0;
+}
+
static struct ocmem_buf *__ocmem_allocate_range(int id, unsigned long min,
unsigned long max, unsigned long step, bool block, bool wait)
{
@@ -218,6 +234,15 @@
return __ocmem_free(client_id, buffer);
}
+int ocmem_shrink(int client_id, struct ocmem_buf *buffer, unsigned long len)
+{
+ if (!buffer)
+ return -EINVAL;
+ if (len >= buffer->len)
+ return -EINVAL;
+ return __ocmem_shrink(client_id, buffer, len);
+}
+
int pre_validate_chunk_list(struct ocmem_map_list *list)
{
int i = 0;
@@ -236,8 +261,12 @@
for (i = 0; i < list->num_chunks; i++) {
if (!chunks[i].ddr_paddr ||
- chunks[i].size < MIN_CHUNK_SIZE)
+ chunks[i].size < MIN_CHUNK_SIZE ||
+ !IS_ALIGNED(chunks[i].size, MIN_CHUNK_SIZE)) {
+ pr_err("Invalid ocmem chunk at index %d (p: %lx, size %lx)\n",
+ i, chunks[i].ddr_paddr, chunks[i].size);
return -EINVAL;
+ }
}
return 0;
}
@@ -265,7 +294,7 @@
return -EINVAL;
}
- if (!pre_validate_chunk_list(list))
+ if (pre_validate_chunk_list(list) != 0)
return -EINVAL;
handle = buffer_to_handle(buffer);
@@ -303,14 +332,10 @@
return -EINVAL;
}
- if (!pre_validate_chunk_list(list))
+ if (pre_validate_chunk_list(list) != 0)
return -EINVAL;
handle = buffer_to_handle(buffer);
-
- if (!handle)
- return -EINVAL;
-
mutex_lock(&handle->handle_mutex);
ret = process_xfer(client_id, handle, list, TO_DDR);
mutex_unlock(&handle->handle_mutex);
@@ -325,3 +350,52 @@
}
return process_quota(client_id);
}
+
+/* Synchronous eviction/restore calls */
+/* Only a single eviction or restoration is allowed */
+/* Evictions/Restorations cannot be concurrent with other maps */
+int ocmem_evict(int client_id)
+{
+ int ret = 0;
+
+ if (!check_id(client_id)) {
+ pr_err("ocmem: Invalid client id: %d\n", client_id);
+ return -EINVAL;
+ }
+
+ mutex_lock(&ocmem_eviction_lock);
+ if (test_bit(client_id, evicted)) {
+ pr_err("ocmem: Previous eviction was not restored by %d\n",
+ client_id);
+ mutex_unlock(&ocmem_eviction_lock);
+ return -EINVAL;
+ }
+
+ ret = process_evict(client_id);
+ if (ret == 0)
+ set_bit(client_id, evicted);
+
+ mutex_unlock(&ocmem_eviction_lock);
+ return ret;
+}
+
+int ocmem_restore(int client_id)
+{
+ int ret = 0;
+
+ if (!check_id(client_id)) {
+ pr_err("ocmem: Invalid client id: %d\n", client_id);
+ return -EINVAL;
+ }
+
+ mutex_lock(&ocmem_eviction_lock);
+ if (!test_bit(client_id, evicted)) {
+ pr_err("ocmem: No previous eviction by %d\n", client_id);
+ mutex_unlock(&ocmem_eviction_lock);
+ return -EINVAL;
+ }
+ ret = process_restore(client_id);
+ clear_bit(client_id, evicted);
+ mutex_unlock(&ocmem_eviction_lock);
+ return ret;
+}