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Commit 2c691075 authored by Rohit Vaswani's avatar Rohit Vaswani
Browse files

drivers: qcom: secure_buffer: Optimize by re-using the same buffer 



Re-use the same buffer for the hyp assign calls rather than allocating
a new one for every single call.

Change-Id: Ia76f9743c7eb83d3432ac19cc98be243434c2aa8
Signed-off-by: default avatarRohit Vaswani <rvaswani@codeaurora.org>
parent 1c2c6d7f

drivers/soc/qcom/secure_buffer.c

+62 −56
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2011 Google, Inc

 * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.

 * Copyright (c) 2011-2016, 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
@@ -19,6 +19,7 @@ 
#include <linux/mutex.h>

#include <linux/scatterlist.h>

#include <linux/slab.h>

#include <linux/dma-mapping.h>

#include <soc/qcom/scm.h>

#include <soc/qcom/secure_buffer.h>
@@ -65,6 +66,10 @@ struct dest_info_list { 
	u64 list_size;

};



static void *qcom_secure_mem;

#define QCOM_SECURE_MEM_SIZE (512*1024)

#define PADDING 32



static int secure_buffer_change_chunk(u32 chunks,

				u32 nchunks,

				u32 chunk_size,
@@ -195,18 +200,14 @@ int msm_unsecure_table(struct sg_table *table) 


}



static struct dest_info_list *populate_dest_info(int *dest_vmids, int nelements,

								int *dest_perms)

static void populate_dest_info(int *dest_vmids, int nelements,

			int *dest_perms, struct dest_info_list **list,

			void *current_qcom_secure_mem)

{

	struct dest_vm_and_perm_info *dest_info;

	struct dest_info_list *list;

	int i;



	dest_info = kmalloc_array(nelements,

			(sizeof(struct dest_vm_and_perm_info)),

				GFP_KERNEL | __GFP_ZERO);

	if (!dest_info)

		return NULL;

	dest_info = (struct dest_vm_and_perm_info *)current_qcom_secure_mem;



	for (i = 0; i < nelements; i++) {

		dest_info[i].vm = dest_vmids[i];
@@ -214,56 +215,31 @@ static struct dest_info_list *populate_dest_info(int *dest_vmids, int nelements, 
		dest_info[i].ctx = NULL;

		dest_info[i].ctx_size = 0;

	}

	list = kzalloc(sizeof(struct dest_info_list), GFP_KERNEL);

	if (!list) {

		kfree(dest_info);

		return NULL;

	}



	list->dest_info = dest_info;

	list->list_size = nelements * sizeof(struct dest_vm_and_perm_info);

	*list = (struct dest_info_list *)&dest_info[i];



	return list;

	(*list)->dest_info = dest_info;

	(*list)->list_size = nelements * sizeof(struct dest_vm_and_perm_info);

}



static struct info_list *get_info_list_from_table(struct sg_table *table)

static void get_info_list_from_table(struct sg_table *table,

					struct info_list **list)

{

	int i;

	struct scatterlist *sg;

	struct mem_prot_info *info;

	struct info_list *list;



	info = kmalloc_array(table->nents, (sizeof(struct mem_prot_info)),

					GFP_KERNEL | __GFP_ZERO);

	if (!info)

		return NULL;

	info = (struct mem_prot_info *)qcom_secure_mem;



	for_each_sg(table->sgl, sg, table->nents, i) {

		info[i].addr = page_to_phys(sg_page(sg));

		info[i].size = sg->length;

	}



	list = kzalloc(sizeof(struct info_list), GFP_KERNEL);

	if (!list) {

		kfree(info);

		return NULL;

	}



	list->list_head = info;

	list->list_size = table->nents * sizeof(struct mem_prot_info);

	return list;

}



static void destroy_info_list(struct info_list *info_list)

{

	kfree(info_list->list_head);

	kfree(info_list);

}

	*list = (struct info_list *)&(info[i]);



static void destroy_dest_info_list(struct dest_info_list *dest_list)

{

	kfree(dest_list->dest_info);

	kfree(dest_list);

	(*list)->list_head = info;

	(*list)->list_size = table->nents * sizeof(struct mem_prot_info);

}



int hyp_assign_table(struct sg_table *table,
@@ -276,16 +252,22 @@ int hyp_assign_table(struct sg_table *table, 
	struct dest_info_list *dest_info_list = NULL;

	struct scm_desc desc = {0};

	u32 *source_vm_copy;

	void *current_qcom_secure_mem;



	size_t reqd_size = dest_nelems * sizeof(struct dest_vm_and_perm_info) +

			table->nents * sizeof(struct mem_prot_info) +

			sizeof(dest_info_list) + sizeof(info_list) + PADDING;



	info_list = get_info_list_from_table(table);

	if (!info_list)

	if (!qcom_secure_mem) {

		pr_err("%s is not functional as qcom_secure_mem is not allocated.\n",

				__func__);

		return -ENOMEM;

	}



	dest_info_list = populate_dest_info(dest_vmids, dest_nelems,

							dest_perms);

	if (!dest_info_list) {

		ret = -ENOMEM;

		goto err1;

	if (QCOM_SECURE_MEM_SIZE < reqd_size) {

		pr_err("%s: Not enough memory allocated. Required size %zd\n",

				__func__, reqd_size);

		return -EINVAL;

	}



	/*
@@ -295,12 +277,20 @@ int hyp_assign_table(struct sg_table *table, 
	source_vm_copy = kmalloc_array(

		source_nelems, sizeof(*source_vm_copy), GFP_KERNEL);

	if (!source_vm_copy) {

		ret = -ENOMEM;

		goto err2;

		return -ENOMEM;

	}



	memcpy(source_vm_copy, source_vm_list,

	       sizeof(*source_vm_list) * source_nelems);



	mutex_lock(&secure_buffer_mutex);



	get_info_list_from_table(table, &info_list);



	current_qcom_secure_mem = &(info_list[1]);

	populate_dest_info(dest_vmids, dest_nelems, dest_perms,

				&dest_info_list, current_qcom_secure_mem);



	desc.args[0] = virt_to_phys(info_list->list_head);

	desc.args[1] = info_list->list_size;

	desc.args[2] = virt_to_phys(source_vm_copy);
@@ -325,11 +315,8 @@ int hyp_assign_table(struct sg_table *table, 
		pr_info("%s: Failed to assign memory protection, ret = %d\n",

			__func__, ret);



	mutex_unlock(&secure_buffer_mutex);

	kfree(source_vm_copy);

err2:

	destroy_dest_info_list(dest_info_list);

err1:

	destroy_info_list(info_list);

	return ret;

}
@@ -407,3 +394,22 @@ bool msm_secure_v2_is_supported(void) 
	 */

	return version >= MAKE_CP_VERSION(1, 1, 0);

}



static int __init alloc_secure_shared_memory(void)

{

	int ret = 0;



	qcom_secure_mem = kzalloc(QCOM_SECURE_MEM_SIZE, GFP_KERNEL);

	if (!qcom_secure_mem) {

		/* Fallback to CMA-DMA memory */

		qcom_secure_mem = dma_alloc_coherent(NULL, QCOM_SECURE_MEM_SIZE,

						NULL, GFP_KERNEL);

		if (!qcom_secure_mem) {

			pr_err("Couldn't allocate memory for secure use-cases. hyp_assign_table will not work\n");

			return -ENOMEM;

		}

	}



	return ret;

}

pure_initcall(alloc_secure_shared_memory);