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gpu: nvgpu: add speculative barrier

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Data can be speculativerly stored and
code flow can be hijacked.

To mitigate this problem insert a
speculation barrier.

Bug 200447167

Change-Id: Ia865ff2add8b30de49aa970715625b13e8f71c08
Signed-off-by: Ranjanikar Nikhil Prabhakarrao <rprabhakarra@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1972221
(cherry picked from commit f0762ed483)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/1996052
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
Tested-by: Deepak Nibade <dnibade@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Ranjanikar Nikhil Prabhakarrao
2018-12-13 17:29:20 +05:30
committed by mobile promotions
parent bbef4c6927
commit f56874aec2
13 changed files with 589 additions and 0 deletions
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5
drivers/gpu/nvgpu/os/linux/ioctl_channel.c
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@@ -290,6 +290,7 @@ static int gk20a_channel_cycle_stats_snapshot(struct channel_gk20a *ch,
if (!args->dmabuf_fd)
return -EINVAL;
nvgpu_speculation_barrier();
/* handle the command (most frequent cases first) */
switch (args->cmd) {
case NVGPU_IOCTL_CHANNEL_CYCLE_STATS_SNAPSHOT_CMD_FLUSH:
@@ -874,6 +875,7 @@ clean_up:
*/
u32 nvgpu_get_common_runlist_level(u32 level)
{
nvgpu_speculation_barrier();
switch (level) {
case NVGPU_RUNLIST_INTERLEAVE_LEVEL_LOW:
return NVGPU_FIFO_RUNLIST_INTERLEAVE_LEVEL_LOW;
@@ -982,6 +984,7 @@ u32 nvgpu_get_ioctl_compute_preempt_mode(u32 compute_preempt_mode)
*/
static u32 nvgpu_get_common_graphics_preempt_mode(u32 graphics_preempt_mode)
{
nvgpu_speculation_barrier();
switch (graphics_preempt_mode) {
case NVGPU_GRAPHICS_PREEMPTION_MODE_WFI:
return NVGPU_PREEMPTION_MODE_GRAPHICS_WFI;
@@ -998,6 +1001,7 @@ static u32 nvgpu_get_common_graphics_preempt_mode(u32 graphics_preempt_mode)
*/
static u32 nvgpu_get_common_compute_preempt_mode(u32 compute_preempt_mode)
{
nvgpu_speculation_barrier();
switch (compute_preempt_mode) {
case NVGPU_COMPUTE_PREEMPTION_MODE_WFI:
return NVGPU_PREEMPTION_MODE_COMPUTE_WFI;
@@ -1121,6 +1125,7 @@ long gk20a_channel_ioctl(struct file *filp,
/* this ioctl call keeps a ref to the file which keeps a ref to the
* channel */
nvgpu_speculation_barrier();
switch (cmd) {
case NVGPU_IOCTL_CHANNEL_OPEN:
err = gk20a_channel_open_ioctl(ch->g,