From: Ruchika Gupta <ruchika.gupta@nxp.com>
Date: Thu, 12 Apr 2018 10:54:35 +0000 (+0530)
Subject: armv8: sec_firmware: Remove JR3 from device tree node in all cases
X-Git-Tag: v2018.07-rc1~160^2~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b6bb93de75033d6d52392fff1d3f512b2feeadb6;p=platform%2Fkernel%2Fu-boot.git

armv8: sec_firmware: Remove JR3 from device tree node in all cases

JR3 was getting removed from device tree only if random number
generation was successful. However, if SEC firmware is present,
JR3 should be removed from device tree node irrespective of the
random seed generation as SEC firmware reserves it for it's use.
Not removing it in case of random number generation failure causes
the kernel to crash.

Random number generation was being called twice. This is not
required. If SEC firmware is running, SIP call can be made to the SEC
firmware to get the random number. This call itself would return
failure if function is not supported. Duplicate calling of random
number generation function has been removed.

Signed-off-by: Ruchika Gupta <ruchika.gupta@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
---

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
index 4afc046..fc9de73 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
@@ -414,8 +414,8 @@ void ft_cpu_setup(void *blob, bd_t *bd)
 		ccsr_sec_t __iomem *sec;
 
 #ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
-		if (fdt_fixup_kaslr(blob))
-			fdt_fixup_remove_jr(blob);
+		fdt_fixup_remove_jr(blob);
+		fdt_fixup_kaslr(blob);
 #endif
 
 		sec = (void __iomem *)CONFIG_SYS_FSL_SEC_ADDR;
diff --git a/arch/arm/cpu/armv8/sec_firmware.c b/arch/arm/cpu/armv8/sec_firmware.c
index 6a04eac..5d2d839 100644
--- a/arch/arm/cpu/armv8/sec_firmware.c
+++ b/arch/arm/cpu/armv8/sec_firmware.c
@@ -317,9 +317,7 @@ unsigned int sec_firmware_support_psci_version(void)
  */
 bool sec_firmware_support_hwrng(void)
 {
-	uint8_t rand[8];
 	if (sec_firmware_addr & SEC_FIRMWARE_RUNNING) {
-		if (!sec_firmware_get_random(rand, 8))
 			return true;
 	}
 
@@ -428,8 +426,10 @@ int fdt_fixup_kaslr(void *fdt)
 
 #if defined(CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT)
 	/* Check if random seed generation is  supported */
-	if (sec_firmware_support_hwrng() == false)
+	if (sec_firmware_support_hwrng() == false) {
+		printf("WARNING: SEC firmware not running, no kaslr-seed\n");
 		return 0;
+	}
 
 	ret = sec_firmware_get_random(rand, 8);
 	if (ret < 0) {