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> disjunction = conjunction { "OR" conjunction }; > conjunction = single_rule { single_rule } > /* AND operator is implicit */; > single_rule = ? GRAPHICS_VERSION(...), MEDIA_VERSION(...), > FUNC(...), etc ?; > > While rule_matches() currently works for the grammar above, it doesn't > easily resemble it. Let's replace it with an implementation that is > structured in a way to resemble the grammar. > > Such a new implementation, although a bit more verbose, is arguably > easier to reason about and to adapt to any extension we do to the > grammer in the future. > > Signed-off-by: Gustavo Sousa Reviewed-by: Violet Monti > --- > drivers/gpu/drm/xe/xe_rtp.c | 138 ++++++++++++++++++++++++++++---------------- > 1 file changed, 88 insertions(+), 50 deletions(-) > > diff --git a/drivers/gpu/drm/xe/xe_rtp.c b/drivers/gpu/drm/xe/xe_rtp.c > index 976a2e1f5592..dec9d94e6fb0 100644 > --- a/drivers/gpu/drm/xe/xe_rtp.c > +++ b/drivers/gpu/drm/xe/xe_rtp.c > @@ -30,11 +30,28 @@ static bool has_samedia(const struct xe_device *xe) > return xe->info.media_verx100 >= 1300; > } > > -static bool rule_match_item(const struct xe_device *xe, > - struct xe_gt *gt, > - struct xe_hw_engine *hwe, > - const struct xe_rtp_rule *r) > +struct rule_match_ctx { > + const struct xe_device *xe; > + struct xe_gt *gt; > + struct xe_hw_engine *hwe; > + const struct xe_rtp_rule *rules; > + const unsigned int n_rules; > + unsigned int head; > + int err; > +}; > + > +static bool rule_is_item(const struct xe_rtp_rule *r) > +{ > + return r->match_type != XE_RTP_MATCH_OR; > +} > + > +static bool rule_match_item(struct rule_match_ctx *match_ctx) > { > + const struct xe_device *xe = match_ctx->xe; > + struct xe_gt *gt = match_ctx->gt; > + struct xe_hw_engine *hwe = match_ctx->hwe; > + const struct xe_rtp_rule *r = &match_ctx->rules[match_ctx->head]; > + > switch (r->match_type) { > case XE_RTP_MATCH_PLATFORM: > return xe->info.platform == r->platform; > @@ -120,6 +137,63 @@ static bool rule_match_item(const struct xe_device *xe, > } > } > > +/* > + * Match a conjunctive set of rules (rules joined by an implicit "AND"). > + * > + * Once one item evaluates to false, the remaining items are not evaluated > + * anymore. Nevetheless, all rules are consumed to allow detecting syntax > + * errors. > + */ > +static bool rule_match_and(struct rule_match_ctx *match_ctx, bool parse_only) > +{ > + bool match = true; > + unsigned int count = 0; > + > + while (match_ctx->head < match_ctx->n_rules && > + rule_is_item(&match_ctx->rules[match_ctx->head])) { > + if (!parse_only) > + match = rule_match_item(match_ctx); > + > + if (!match) > + parse_only = true; > + > + match_ctx->head++; > + count++; > + } > + > + if (drm_WARN_ON(&match_ctx->xe->drm, !count)) { > + match_ctx->err = -EINVAL; > + > + if (!parse_only) > + match = false; > + } > + > + return match; > +} > + > +/* > + * Match a disjunctive set of rules (subset of rules joined by > + * "XE_RTP_MATCH_OR"). > + * > + * Once one subset evaluates to true, the remaining items are not evaluated > + * anymore. Nevetheless, all rules are consumed to allow detecting syntax > + * errors. > + */ > +static bool rule_match_or(struct rule_match_ctx *match_ctx) > +{ > + bool match = rule_match_and(match_ctx, false); > + > + while (match_ctx->head < match_ctx->n_rules && > + match_ctx->rules[match_ctx->head].match_type == XE_RTP_MATCH_OR) { > + /* Consume XE_RTP_MATCH_OR. */ > + match_ctx->head++; > + > + match = rule_match_and(match_ctx, match); > + } > + > + return match; > +} > + > static bool rule_matches_with_err(const struct xe_device *xe, > struct xe_gt *gt, > struct xe_hw_engine *hwe, > @@ -127,55 +201,19 @@ static bool rule_matches_with_err(const struct xe_device *xe, > unsigned int n_rules, > int *err) > { > - const struct xe_rtp_rule *r; > - unsigned int i, rcount = 0; > - bool short_circuit_or = false; > + struct rule_match_ctx match_ctx = { > + .xe = xe, > + .gt = gt, > + .hwe = hwe, > + .rules = rules, > + .n_rules = n_rules, > + }; > + bool match = rule_match_or(&match_ctx); > > if (err) > - *err = 0; > - > - for (r = rules, i = 0; i < n_rules; r = &rules[++i]) { > - if (r->match_type == XE_RTP_MATCH_OR) { > - if (drm_WARN_ON(&xe->drm, !rcount)) { > - if (err) > - *err = -EINVAL; > - continue; > - } > - > - /* > - * This is only reached if a complete conjunction of > - * rules passed, in which case we short-circuit rule > - * evaluation, but still keep parsing to find any syntax > - * errors. > - */ > - short_circuit_or = true; > - rcount = 0; > - continue; > - } > - > - if (short_circuit_or || rule_match_item(xe, gt, hwe, r)) { > - rcount++; > - } else { > - /* > - * Advance rules until we find XE_RTP_MATCH_OR to check > - * if there's another set of conditions to check > - */ > - while (++i < n_rules && rules[i].match_type != XE_RTP_MATCH_OR) > - ; > - > - if (i >= n_rules) > - return false; > - > - rcount = 0; > - } > - } > - > - if (drm_WARN_ON(&xe->drm, !rcount)) { > - if (err) > - *err = -EINVAL; > - } > + *err = match_ctx.err; > > - return short_circuit_or || rcount; > + return match; > } > > static bool rule_matches(const struct xe_device *xe, > > -- > 2.53.0 > -- -- Violet Monti