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path: root/drivers/gpu/ion/msm/secure_buffer.c
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Diffstat (limited to 'drivers/gpu/ion/msm/secure_buffer.c')
-rw-r--r--drivers/gpu/ion/msm/secure_buffer.c298
1 files changed, 0 insertions, 298 deletions
diff --git a/drivers/gpu/ion/msm/secure_buffer.c b/drivers/gpu/ion/msm/secure_buffer.c
deleted file mode 100644
index c492ec3245e..00000000000
--- a/drivers/gpu/ion/msm/secure_buffer.c
+++ /dev/null
@@ -1,298 +0,0 @@
-/*
- * Copyright (C) 2011 Google, Inc
- * Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 and
- * only version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
-
-#include <linux/highmem.h>
-#include <linux/kernel.h>
-#include <linux/kref.h>
-#include <linux/msm_ion.h>
-#include <linux/mutex.h>
-#include <linux/scatterlist.h>
-#include <linux/slab.h>
-
-#include <mach/scm.h>
-
-static struct rb_root secure_root;
-DEFINE_MUTEX(secure_buffer_mutex);
-
-struct secure_meta {
- struct rb_node node;
- struct sg_table *table;
- struct kref ref;
- enum cp_mem_usage usage;
-};
-
-struct cp2_mem_chunks {
- unsigned int *chunk_list;
- unsigned int chunk_list_size;
- unsigned int chunk_size;
-} __attribute__ ((__packed__));
-
-struct cp2_lock_req {
- struct cp2_mem_chunks chunks;
- unsigned int mem_usage;
- unsigned int lock;
-} __attribute__ ((__packed__));
-
-#define MEM_PROTECT_LOCK_ID2 0x0A
-#define V2_CHUNK_SIZE SZ_1M
-#define FEATURE_ID_CP 12
-
-static void secure_meta_add(struct secure_meta *meta)
-{
- struct rb_root *root = &secure_root;
- struct rb_node **p = &root->rb_node;
- struct rb_node *parent = NULL;
- struct secure_meta *entry;
-
- while (*p) {
- parent = *p;
- entry = rb_entry(parent, struct secure_meta, node);
-
- if (meta->table < entry->table) {
- p = &(*p)->rb_left;
- } else if (meta->table > entry->table) {
- p = &(*p)->rb_right;
- } else {
- pr_err("%s: table %p already exists\n", __func__,
- entry->table);
- BUG();
- }
- }
-
- rb_link_node(&meta->node, parent, p);
- rb_insert_color(&meta->node, root);
-}
-
-
-static struct secure_meta *secure_meta_lookup(struct sg_table *table)
-{
- struct rb_root *root = &secure_root;
- struct rb_node **p = &root->rb_node;
- struct rb_node *parent = NULL;
- struct secure_meta *entry = NULL;
-
- while (*p) {
- parent = *p;
- entry = rb_entry(parent, struct secure_meta, node);
-
- if (table < entry->table)
- p = &(*p)->rb_left;
- else if (table > entry->table)
- p = &(*p)->rb_right;
- else
- return entry;
- }
-
- return NULL;
-}
-
-
-static int secure_buffer_change_chunk(unsigned long chunks,
- unsigned int nchunks,
- unsigned int chunk_size,
- enum cp_mem_usage usage,
- int lock)
-{
- struct cp2_lock_req request;
- u32 resp;
-
- request.mem_usage = usage;
- request.lock = lock;
-
- request.chunks.chunk_list = (unsigned int *)chunks;
- request.chunks.chunk_list_size = nchunks;
- request.chunks.chunk_size = chunk_size;
-
- kmap_flush_unused();
- kmap_atomic_flush_unused();
- return scm_call(SCM_SVC_MP, MEM_PROTECT_LOCK_ID2,
- &request, sizeof(request), &resp, sizeof(resp));
-
-}
-
-
-
-static int secure_buffer_change_table(struct sg_table *table,
- enum cp_mem_usage usage,
- int lock)
-{
- int i;
- int ret = -EINVAL;
- unsigned long *chunk_list;
- struct scatterlist *sg;
-
- for_each_sg(table->sgl, sg, table->nents, i) {
- int nchunks;
- int size = sg_dma_len(sg);
- int chunk_list_len;
- phys_addr_t chunk_list_phys;
-
- /*
- * This should theoretically be a phys_addr_t but the protocol
- * indicates this should be an unsigned long.
- */
- unsigned long base = (unsigned long)sg_dma_address(sg);
-
- nchunks = size / V2_CHUNK_SIZE;
- chunk_list_len = sizeof(unsigned long)*nchunks;
-
- chunk_list = kzalloc(chunk_list_len, GFP_KERNEL);
-
- if (!chunk_list)
- return -ENOMEM;
-
- chunk_list_phys = virt_to_phys(chunk_list);
- for (i = 0; i < nchunks; i++)
- chunk_list[i] = base + i * V2_CHUNK_SIZE;
-
- /*
- * Flush the chunk list before sending the memory to the
- * secure environment to ensure the data is actually present
- * in RAM
- */
- dmac_flush_range(chunk_list, chunk_list + chunk_list_len);
- outer_flush_range(chunk_list_phys,
- chunk_list_phys + chunk_list_len);
-
- ret = secure_buffer_change_chunk(virt_to_phys(chunk_list),
- nchunks, V2_CHUNK_SIZE, usage, lock);
-
- kfree(chunk_list);
- }
-
- return ret;
-}
-
-int msm_ion_secure_table(struct sg_table *table, enum cp_mem_usage usage,
- int flags)
-{
- struct secure_meta *meta;
- int ret;
-
- mutex_lock(&secure_buffer_mutex);
- meta = secure_meta_lookup(table);
-
- if (meta) {
- kref_get(&meta->ref);
- ret = 0;
- } else {
- meta = kzalloc(sizeof(*meta), GFP_KERNEL);
-
- if (!meta) {
- ret = -ENOMEM;
- goto out;
- }
-
- meta->table = table;
- meta->usage = usage;
- kref_init(&meta->ref);
-
- ret = secure_buffer_change_table(table, usage, 1);
- if (!ret)
- secure_meta_add(meta);
- else
- kfree(meta);
- }
-out:
- mutex_unlock(&secure_buffer_mutex);
-
- return ret;
-
-}
-
-int msm_ion_secure_buffer(struct ion_client *client, struct ion_handle *handle,
- enum cp_mem_usage usage, int flags)
-{
- struct sg_table *table;
- int ret;
-
- table = ion_sg_table(client, handle);
-
- if (IS_ERR_OR_NULL(table)) {
- ret = -EINVAL;
- goto out;
- }
-
- ret = msm_ion_secure_table(table, usage, flags);
-out:
- return ret;
-}
-
-
-static void msm_secure_buffer_release(struct kref *kref)
-{
- struct secure_meta *meta = container_of(kref, struct secure_meta,
- ref);
-
- rb_erase(&meta->node, &secure_root);
- secure_buffer_change_table(meta->table, meta->usage, 0);
- kfree(meta);
-}
-
-int msm_ion_unsecure_table(struct sg_table *table)
-{
- struct secure_meta *meta;
- int ret = 0;
-
- mutex_lock(&secure_buffer_mutex);
- meta = secure_meta_lookup(table);
-
- if (!meta) {
- ret = -EINVAL;
- goto out;
- }
-
- kref_put(&meta->ref, msm_secure_buffer_release);
-
-out:
- mutex_unlock(&secure_buffer_mutex);
- return ret;
-
-}
-
-int msm_ion_unsecure_buffer(struct ion_client *client,
- struct ion_handle *handle)
-{
- struct sg_table *table;
- int ret = 0;
-
- table = ion_sg_table(client, handle);
-
- if (IS_ERR_OR_NULL(table)) {
- WARN(1, "Could not get table for handle %p to unsecure\n",
- handle);
- ret = -EINVAL;
- goto out;
- }
-
- msm_ion_unsecure_table(table);
-
-out:
- return ret;
-}
-
-#define MAKE_CP_VERSION(major, minor, patch) \
- (((major & 0x3FF) << 22) | ((minor & 0x3FF) << 12) | (patch & 0xFFF))
-
-bool msm_secure_v2_is_supported(void)
-{
- int version = scm_get_feat_version(FEATURE_ID_CP);
-
- /*
- * if the version is < 1.1.0 then dynamic buffer allocation is
- * not supported
- */
- return version >= MAKE_CP_VERSION(1, 1, 0);
-}
generated by cgit v1.2.3 (git 2.25.1) at 2025-12-23 18:51:01 +0000