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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 <talho@nvidia.com>
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Timo Alho 2022-06-22 16:22:59 +03:00 committed by Thierry Reding
parent f2906aa863
commit a4740b148a
1 changed files with 3 additions and 3 deletions
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6
drivers/firmware/tegra/bpmp.c
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@ -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))