Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> Since we want to read the values from the HWSP as written to by the GPU,
> warn the compiler that the values are volatile.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/gt/selftest_timeline.c | 23 +++++++++++----------
> 1 file changed, 12 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/selftest_timeline.c b/drivers/gpu/drm/i915/gt/selftest_timeline.c
> index fb5b7d3498a6..1203b7460557 100644
> --- a/drivers/gpu/drm/i915/gt/selftest_timeline.c
> +++ b/drivers/gpu/drm/i915/gt/selftest_timeline.c
> @@ -491,7 +491,7 @@ checked_intel_timeline_create(struct intel_gt *gt)
> if (IS_ERR(tl))
> return tl;
>
> - if (*tl->hwsp_seqno != tl->seqno) {
> + if (READ_ONCE(*tl->hwsp_seqno) != tl->seqno) {
> pr_err("Timeline created with incorrect breadcrumb, found %x, expected %x\n",
> *tl->hwsp_seqno, tl->seqno);
> intel_timeline_put(tl);
> @@ -561,9 +561,9 @@ static int live_hwsp_engine(void *arg)
> for (n = 0; n < count; n++) {
> struct intel_timeline *tl = timelines[n];
>
> - if (!err && *tl->hwsp_seqno != n) {
> - pr_err("Invalid seqno stored in timeline %lu @ %x, found 0x%x\n",
> - n, tl->hwsp_offset, *tl->hwsp_seqno);
> + if (!err && READ_ONCE(*tl->hwsp_seqno) != n) {
> + GEM_TRACE_ERR("Invalid seqno:%lu stored in timeline %llu @ %x, found 0x%x\n",
> + n, tl->fence_context, tl->hwsp_offset, *tl->hwsp_seqno);
> GEM_TRACE_DUMP();
> err = -EINVAL;
> }
> @@ -633,9 +633,9 @@ static int live_hwsp_alternate(void *arg)
> for (n = 0; n < count; n++) {
> struct intel_timeline *tl = timelines[n];
>
> - if (!err && *tl->hwsp_seqno != n) {
> - pr_err("Invalid seqno stored in timeline %lu @ %x, found 0x%x\n",
> - n, tl->hwsp_offset, *tl->hwsp_seqno);
> + if (!err && READ_ONCE(*tl->hwsp_seqno) != n) {
> + GEM_TRACE_ERR("Invalid seqno:%lu stored in timeline %llu @ %x, found 0x%x\n",
> + n, tl->fence_context, tl->hwsp_offset, *tl->hwsp_seqno);
> GEM_TRACE_DUMP();
> err = -EINVAL;
> }
> @@ -733,7 +733,8 @@ static int live_hwsp_wrap(void *arg)
> goto out;
> }
>
> - if (*hwsp_seqno[0] != seqno[0] || *hwsp_seqno[1] != seqno[1]) {
> + if (READ_ONCE(*hwsp_seqno[0]) != seqno[0] ||
> + READ_ONCE(*hwsp_seqno[1]) != seqno[1]) {
> pr_err("Bad timeline values: found (%x, %x), expected (%x, %x)\n",
> *hwsp_seqno[0], *hwsp_seqno[1],
> seqno[0], seqno[1]);
> @@ -966,9 +967,9 @@ static int live_hwsp_recycle(void *arg)
> break;
> }
>
> - if (*tl->hwsp_seqno != count) {
> - pr_err("Invalid seqno stored in timeline %lu @ tl->hwsp_offset, found 0x%x\n",
> - count, *tl->hwsp_seqno);
> + if (READ_ONCE(*tl->hwsp_seqno) != count) {
> + GEM_TRACE_ERR("Invalid seqno:%lu stored in timeline %llu @ %x found 0x%x\n",
> + count, tl->fence_context, tl->hwsp_offset, *tl->hwsp_seqno);
> GEM_TRACE_DUMP();
> err = -EINVAL;
> }
> --
> 2.20.1
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