iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

firmware: tegra: bpmp: Do only aligned access to IPC memory area

Browse Source 
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>
This commit is contained in:
Timo Alho 2022-06-22 16:22:59 +03:00 committed by Greg Kroah-Hartman
parent 1cf8293182
commit 515af71adf
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/firmware/tegra/bpmp.c
View File

@ -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))