From: Timo Alho Date: Wed, 22 Jun 2022 13:22:59 +0000 (+0300) Subject: firmware: tegra: bpmp: Do only aligned access to IPC memory area X-Git-Tag: v6.0-rc1~195^2~8^2~1 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a4740b148a04dc60e14fe6a1dfe216d3bae214fd;p=thirdparty%2Flinux.git firmware: tegra: bpmp: Do only aligned access to IPC memory area 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 Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding --- diff --git a/drivers/firmware/tegra/bpmp.c b/drivers/firmware/tegra/bpmp.c index 5654c5e9862b1..037db21de510c 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))