Just a couple of naked 64bit divides causing link errors on 32bit
builds, with:
ERROR: "__udivdi3" [drivers/gpu/drm/i915/i915.ko] undefined!
v2: do_div() is only u64/u32, we need a u32/u64!
v3: div_u64() == u64/u32, div64_u64() == u64/u64
Reported-by: kbuild test robot <fengguang.wu@xxxxxxxxx>
Fixes: d79651522e89 ("drm/i915: Enable i915 perf stream for Haswell OA unit")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Robert Bragg <robert@xxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_perf.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 95512824922b..14de9a4eee27 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -974,8 +974,8 @@ static void i915_oa_stream_disable(struct i915_perf_stream *stream)
static u64 oa_exponent_to_ns(struct drm_i915_private *dev_priv, int exponent)
{
- return 1000000000ULL * (2ULL << exponent) /
- dev_priv->perf.oa.timestamp_frequency;
+ return div_u64(1000000000ULL * (2ULL << exponent),
+ dev_priv->perf.oa.timestamp_frequency);
}
static const struct i915_perf_stream_ops i915_oa_stream_ops = {
@@ -1051,16 +1051,17 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
dev_priv->perf.oa.periodic = props->oa_periodic;
if (dev_priv->perf.oa.periodic) {
- u64 period_ns = oa_exponent_to_ns(dev_priv,
- props->oa_period_exponent);
+ u32 tail;
dev_priv->perf.oa.period_exponent = props->oa_period_exponent;
/* See comment for OA_TAIL_MARGIN_NSEC for details
* about this tail_margin...
*/
- dev_priv->perf.oa.tail_margin =
- ((OA_TAIL_MARGIN_NSEC / period_ns) + 1) * format_size;
+ tail = div64_u64(OA_TAIL_MARGIN_NSEC,
+ oa_exponent_to_ns(dev_priv,
+ props->oa_period_exponent));
+ dev_priv->perf.oa.tail_margin = (tail + 1) * format_size;
}
if (stream->ctx) {
--
2.10.2
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