6.6-stable review patch. If anyone has any objections, please let me know.
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From: Cristian Marussi cristian.marussi@arm.com
[ Upstream commit e8ef4bbe39b9576a73f104f6af743fb9c7b624ba ]
When storing opps by level or index use xa_insert() instead of xa_store() and add error-checking to spot bad duplicates indexes possibly wrongly provided by the platform firmware.
Fixes: 31c7c1397a33 ("firmware: arm_scmi: Add v3.2 perf level indexing mode support") Signed-off-by: Cristian Marussi cristian.marussi@arm.com Link: https://lore.kernel.org/r/20240108185050.1628687-1-cristian.marussi@arm.com Signed-off-by: Sudeep Holla sudeep.holla@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/firmware/arm_scmi/perf.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-)
diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c index e887fd169043..dd344506b0a3 100644 --- a/drivers/firmware/arm_scmi/perf.c +++ b/drivers/firmware/arm_scmi/perf.c @@ -347,8 +347,8 @@ process_response_opp(struct scmi_opp *opp, unsigned int loop_idx, }
static inline void -process_response_opp_v4(struct perf_dom_info *dom, struct scmi_opp *opp, - unsigned int loop_idx, +process_response_opp_v4(struct device *dev, struct perf_dom_info *dom, + struct scmi_opp *opp, unsigned int loop_idx, const struct scmi_msg_resp_perf_describe_levels_v4 *r) { opp->perf = le32_to_cpu(r->opp[loop_idx].perf_val); @@ -359,10 +359,23 @@ process_response_opp_v4(struct perf_dom_info *dom, struct scmi_opp *opp, /* Note that PERF v4 reports always five 32-bit words */ opp->indicative_freq = le32_to_cpu(r->opp[loop_idx].indicative_freq); if (dom->level_indexing_mode) { + int ret; + opp->level_index = le32_to_cpu(r->opp[loop_idx].level_index);
- xa_store(&dom->opps_by_idx, opp->level_index, opp, GFP_KERNEL); - xa_store(&dom->opps_by_lvl, opp->perf, opp, GFP_KERNEL); + ret = xa_insert(&dom->opps_by_idx, opp->level_index, opp, + GFP_KERNEL); + if (ret) + dev_warn(dev, + "Failed to add opps_by_idx at %d - ret:%d\n", + opp->level_index, ret); + + ret = xa_insert(&dom->opps_by_lvl, opp->perf, opp, GFP_KERNEL); + if (ret) + dev_warn(dev, + "Failed to add opps_by_lvl at %d - ret:%d\n", + opp->perf, ret); + hash_add(dom->opps_by_freq, &opp->hash, opp->indicative_freq); } } @@ -379,7 +392,7 @@ iter_perf_levels_process_response(const struct scmi_protocol_handle *ph, if (PROTOCOL_REV_MAJOR(p->version) <= 0x3) process_response_opp(opp, st->loop_idx, response); else - process_response_opp_v4(p->perf_dom, opp, st->loop_idx, + process_response_opp_v4(ph->dev, p->perf_dom, opp, st->loop_idx, response); p->perf_dom->opp_count++;