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drm/xe/rtp: Fix off-by-one when processing rules

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Gustavo noticed an odd "+ 2" in rtp_mark_active() while processing
rtp rules and pointed that it should be "+ 1". In fact, while processing
entries without actions (OOB workarounds), if the WA is activated and
has OR rules, it will also inadvertently activate the very next
workaround.

Test in a LNL B0 platform by moving 18024947630 on top of 16020292621,
makes the latter become active:

	$ cat /sys/kernel/debug/dri/0/gt0/workarounds
	...
	OOB Workarounds
		18024947630
		16020292621
		14018094691
		16022287689
		13011645652
		22019338487_display

In future a kunit test will be added to cover the rtp checks for entries
without actions.

Fixes: fe19328b90 ("drm/xe/rtp: Add support for entries with no action")
Cc: Gustavo Sousa <gustavo.sousa@intel.com>
Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240726064337.797576-6-lucas.demarchi@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
This commit is contained in:
Lucas De Marchi 2024-07-25 23:43:35 -07:00
parent 5e9209c373
commit fd6797ec50
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/xe/xe_rtp.c
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@ -231,7 +231,7 @@ static void rtp_mark_active(struct xe_device *xe,
if (first == last)
bitmap_set(ctx->active_entries, first, 1);
else
bitmap_set(ctx->active_entries, first, last - first + 2);
bitmap_set(ctx->active_entries, first, last - first + 1);
}
/**