From: Timo Alho <talho@nvidia.com>
Date: Wed, 22 Jun 2022 16:22:59 +0300
Subject: firmware: tegra: bpmp: Do only aligned access to IPC memory area

Git-commit: a4740b148a04dc60e14fe6a1dfe216d3bae214fd
Patch-mainline: v6.0-rc1
References: git-fixes

Use memcpy_toio and memcpy_fromio variants of memcpy to guarantee no
unaligned access to IPC memory area. This is to allow the IPC memory to
be mapped as Device memory to further suppress speculative reads from
happening within the 64 kB memory area above the IPC memory when 64 kB
memory pages are used.

Signed-off-by: Timo Alho <talho@nvidia.com>
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
---
 drivers/firmware/tegra/bpmp.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/firmware/tegra/bpmp.c b/drivers/firmware/tegra/bpmp.c
index 5654c5e9862b..037db21de510 100644
--- a/drivers/firmware/tegra/bpmp.c
+++ b/drivers/firmware/tegra/bpmp.c
@@ -201,7 +201,7 @@ static ssize_t __tegra_bpmp_channel_read(struct tegra_bpmp_channel *channel,
 	int err;
 
 	if (data && size > 0)
-		memcpy(data, channel->ib->data, size);
+		memcpy_fromio(data, channel->ib->data, size);
 
 	err = tegra_bpmp_ack_response(channel);
 	if (err < 0)
@@ -245,7 +245,7 @@ static ssize_t __tegra_bpmp_channel_write(struct tegra_bpmp_channel *channel,
 	channel->ob->flags = flags;
 
 	if (data && size > 0)
-		memcpy(channel->ob->data, data, size);
+		memcpy_toio(channel->ob->data, data, size);
 
 	return tegra_bpmp_post_request(channel);
 }
@@ -420,7 +420,7 @@ void tegra_bpmp_mrq_return(struct tegra_bpmp_channel *channel, int code,
 	channel->ob->code = code;
 
 	if (data && size > 0)
-		memcpy(channel->ob->data, data, size);
+		memcpy_toio(channel->ob->data, data, size);
 
 	err = tegra_bpmp_post_response(channel);
 	if (WARN_ON(err < 0))
-- 
2.35.3