From: Cristian Marussi <cristian.marussi@xxxxxxx> Ensure that the bad duplicates reported by the platform firmware doesn't get added to the opp-tables. Reported-by: Johan Hovold <johan+linaro@xxxxxxxxxx> Closes: https://lore.kernel.org/lkml/ZoQjAWse2YxwyRJv@xxxxxxxxxxxxxxxxxxxx/ Signed-off-by: Cristian Marussi <cristian.marussi@xxxxxxx> Signed-off-by: Sibi Sankar <quic_sibis@xxxxxxxxxxx> --- drivers/firmware/arm_scmi/perf.c | 37 ++++++++++++++++++++++++-------- 1 file changed, 28 insertions(+), 9 deletions(-) diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c index 2d77b5f40ca7..38893cc44423 100644 --- a/drivers/firmware/arm_scmi/perf.c +++ b/drivers/firmware/arm_scmi/perf.c @@ -373,7 +373,7 @@ static int iter_perf_levels_update_state(struct scmi_iterator_state *st, return 0; } -static inline void +static inline int process_response_opp(struct device *dev, struct perf_dom_info *dom, struct scmi_opp *opp, unsigned int loop_idx, const struct scmi_msg_resp_perf_describe_levels *r) @@ -386,12 +386,16 @@ process_response_opp(struct device *dev, struct perf_dom_info *dom, le16_to_cpu(r->opp[loop_idx].transition_latency_us); ret = xa_insert(&dom->opps_by_lvl, opp->perf, opp, GFP_KERNEL); - if (ret) + if (ret) { dev_warn(dev, "Failed to add opps_by_lvl at %d for %s - ret:%d\n", opp->perf, dom->info.name, ret); + return ret; + } + + return 0; } -static inline void +static inline int 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) @@ -404,10 +408,13 @@ process_response_opp_v4(struct device *dev, struct perf_dom_info *dom, le16_to_cpu(r->opp[loop_idx].transition_latency_us); ret = xa_insert(&dom->opps_by_lvl, opp->perf, opp, GFP_KERNEL); - if (ret) + if (ret) { dev_warn(dev, "Failed to add opps_by_lvl at %d for %s - ret:%d\n", opp->perf, dom->info.name, ret); + return ret; + } + /* 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) { @@ -415,13 +422,21 @@ process_response_opp_v4(struct device *dev, struct perf_dom_info *dom, ret = xa_insert(&dom->opps_by_idx, opp->level_index, opp, GFP_KERNEL); - if (ret) + if (ret) { dev_warn(dev, "Failed to add opps_by_idx at %d for %s - ret:%d\n", opp->level_index, dom->info.name, ret); + /* Cleanup by_lvl too */ + xa_erase(&dom->opps_by_lvl, opp->perf); + + return ret; + } + hash_add(dom->opps_by_freq, &opp->hash, opp->indicative_freq); } + + return 0; } static int @@ -429,16 +444,20 @@ iter_perf_levels_process_response(const struct scmi_protocol_handle *ph, const void *response, struct scmi_iterator_state *st, void *priv) { + int ret; struct scmi_opp *opp; struct scmi_perf_ipriv *p = priv; opp = &p->perf_dom->opp[st->desc_index + st->loop_idx]; if (PROTOCOL_REV_MAJOR(p->version) <= 0x3) - process_response_opp(ph->dev, p->perf_dom, opp, st->loop_idx, - response); + ret = process_response_opp(ph->dev, p->perf_dom, opp, st->loop_idx, response); else - process_response_opp_v4(ph->dev, p->perf_dom, opp, st->loop_idx, - response); + ret = process_response_opp_v4(ph->dev, p->perf_dom, opp, st->loop_idx, response); + + /* Skip BAD duplicates received from firmware */ + if (ret) + return ret == -EBUSY ? 0 : ret; + p->perf_dom->opp_count++; dev_dbg(ph->dev, "Level %d Power %d Latency %dus Ifreq %d Index %d\n", -- 2.34.1
