From: Timo Alho talho@nvidia.com
commit a4740b148a04dc60e14fe6a1dfe216d3bae214fd upstream.
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 Cc: Jon Hunter jonathanh@nvidia.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/firmware/tegra/bpmp.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/firmware/tegra/bpmp.c +++ b/drivers/firmware/tegra/bpmp.c @@ -201,7 +201,7 @@ static ssize_t __tegra_bpmp_channel_read 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_writ 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_ 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))