Merge "soc: qcom: Add better support for early random numbers"

arch/arm/include/asm/archrandom.h

@@ -1,20 +0,0 @@
-/* Copyright (c) 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.
- *
- */
-
-#ifndef ARM_ASM_ARCHRANDOM_H
-#define ARM_ASM_ARCHRANDOM_H
-
-extern int arch_get_random_long(unsigned long *v);
-extern int arch_get_random_int(unsigned int *v);
-
-#endif

drivers/soc/qcom/Kconfig

@@ -821,4 +821,12 @@ config QCOM_SMCINVOKE
 	  Enable SMCInvoke driver which supports capability based secure
 	  communication between QSEE and HLOS.
 
+config QCOM_EARLY_RANDOM
+	bool "Initialize random pool very early"
+	help
+	  The standard random pool may not initialize until late in the boot
+	  process which means that any calls to get random numbers before then
+	  may not be truly random. Select this option to make an early call
+	  to get some random data to put in the pool. If unsure, say N.
+
 source "drivers/soc/qcom/memshare/Kconfig"

drivers/soc/qcom/Makefile

@@ -99,3 +99,4 @@ obj-$(CONFIG_MSM_RPM_LOG) += rpm_log.o
 obj-$(CONFIG_QSEE_IPC_IRQ_BRIDGE) += qsee_ipc_irq_bridge.o
 obj-$(CONFIG_WCD_DSP_GLINK) += wcd-dsp-glink.o
 obj-$(CONFIG_QCOM_SMCINVOKE) += smcinvoke.o
+obj-$(CONFIG_QCOM_EARLY_RANDOM)	+= early_random.o

drivers/soc/qcom/early_random.c

@@ -1,4 +1,4 @@
-/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2013-2014, 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
@@ -12,8 +12,9 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/random.h>
 
-#include <mach/scm.h>
+#include <soc/qcom/scm.h>
 
 #include <asm/io.h>
 #include <asm/cacheflush.h>
@@ -21,32 +22,24 @@
 #define TZ_SVC_CRYPTO	10
 #define PRNG_CMD_ID	0x01
 
-static int use_arch_random = 1;
 struct tz_prng_data {
 	uint8_t		*out_buf;
 	uint32_t	out_buf_sz;
 } __packed;
 
 DEFINE_SCM_BUFFER(common_scm_buf)
-DEFINE_MUTEX(arch_random_lock);
 #define RANDOM_BUFFER_SIZE	PAGE_SIZE
 char random_buffer[RANDOM_BUFFER_SIZE] __aligned(PAGE_SIZE);
 
-int arch_get_random_common(void *v, size_t size)
+void __init init_random_pool(void)
 {
 	struct tz_prng_data data;
 	int ret;
 	u32 resp;
 
-	if (!use_arch_random)
-		return 0;
-
-	if (size > sizeof(random_buffer))
-		return 0;
-
-	mutex_lock(&arch_random_lock);
 	data.out_buf = (uint8_t *) virt_to_phys(random_buffer);
-	data.out_buf_sz = size;
+	data.out_buf_sz = SZ_512;
+	dmac_flush_range(random_buffer, random_buffer + RANDOM_BUFFER_SIZE);
 
 	ret = scm_call_noalloc(TZ_SVC_CRYPTO, PRNG_CMD_ID, &data,
 			sizeof(data), &resp, sizeof(resp),
@@ -54,30 +47,7 @@ int arch_get_random_common(void *v, size_t size)
 	if (!ret) {
 		dmac_inv_range(random_buffer, random_buffer +
 						RANDOM_BUFFER_SIZE);
-		outer_inv_range(
+		add_device_randomness(random_buffer, SZ_512);
-			(unsigned long) virt_to_phys(random_buffer),
-			(unsigned long) virt_to_phys(random_buffer) +
-						RANDOM_BUFFER_SIZE);
-		memcpy(v, random_buffer, size);
 	}
-	mutex_unlock(&arch_random_lock);
-	return !ret;
 }
 
-int arch_get_random_long(unsigned long *v)
-{
-	return arch_get_random_common(v, sizeof(unsigned long));
-}
-
-int arch_get_random_int(unsigned int *v)
-{
-	return arch_get_random_common(v, sizeof(unsigned int));
-}
-
-int arch_random_init(void)
-{
-	use_arch_random = 0;
-
-	return 0;
-}
-module_init(arch_random_init);