| Message ID | 20200721120740.3436-1-georgi.djakov@linaro.org (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | interconnect: Do not skip aggregation for disabled paths | expand |
Hey Georgi, Thanks for the patch! On 2020-07-21 17:37, Georgi Djakov wrote: > When an interconnect path is being disabled, currently we don't > aggregate > the requests for it afterwards. But the re-aggregation step shouldn't > be > skipped, as it may leave the nodes with outdated bandwidth data. This > outdated data may actually keep the path still enabled and prevent the > device from going into lower power states. > > Reported-by: Atul Dhudase <adhudase@codeaurora.org> > Fixes: 7d374b209083 ("interconnect: Add helpers for enabling/disabling > a path") > Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> > --- Reviewed-by: Sibi Sankar <sibis@codeaurora.org> > drivers/interconnect/core.c | 12 +++++++++--- > 1 file changed, 9 insertions(+), 3 deletions(-) > > diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c > index 37d5ec970cc1..5174dcb31ab7 100644 > --- a/drivers/interconnect/core.c > +++ b/drivers/interconnect/core.c > @@ -243,6 +243,7 @@ static int aggregate_requests(struct icc_node > *node) > { > struct icc_provider *p = node->provider; > struct icc_req *r; > + u32 avg_bw, peak_bw; > > node->avg_bw = 0; > node->peak_bw = 0; > @@ -251,9 +252,14 @@ static int aggregate_requests(struct icc_node > *node) > p->pre_aggregate(node); > > hlist_for_each_entry(r, &node->req_list, req_node) { > - if (!r->enabled) > - continue; > - p->aggregate(node, r->tag, r->avg_bw, r->peak_bw, > + if (r->enabled) { > + avg_bw = r->avg_bw; > + peak_bw = r->peak_bw; > + } else { > + avg_bw = 0; > + peak_bw = 0; > + } > + p->aggregate(node, r->tag, avg_bw, peak_bw, > &node->avg_bw, &node->peak_bw); > }
On 2020-07-21 17:37, Georgi Djakov wrote: > When an interconnect path is being disabled, currently we don't > aggregate > the requests for it afterwards. But the re-aggregation step shouldn't > be > skipped, as it may leave the nodes with outdated bandwidth data. This > outdated data may actually keep the path still enabled and prevent the > device from going into lower power states. > > Reported-by: Atul Dhudase <adhudase@codeaurora.org> > Fixes: 7d374b209083 ("interconnect: Add helpers for enabling/disabling > a path") > Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> > --- Tested-by: Atul Dhudase <adhudase@codeaurora.org> Reviewed-by: Atul Dhudase <adhudase@codeaurora.org> > drivers/interconnect/core.c | 12 +++++++++--- > 1 file changed, 9 insertions(+), 3 deletions(-) > > diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c > index 37d5ec970cc1..5174dcb31ab7 100644 > --- a/drivers/interconnect/core.c > +++ b/drivers/interconnect/core.c > @@ -243,6 +243,7 @@ static int aggregate_requests(struct icc_node > *node) > { > struct icc_provider *p = node->provider; > struct icc_req *r; > + u32 avg_bw, peak_bw; > > node->avg_bw = 0; > node->peak_bw = 0; > @@ -251,9 +252,14 @@ static int aggregate_requests(struct icc_node > *node) > p->pre_aggregate(node); > > hlist_for_each_entry(r, &node->req_list, req_node) { > - if (!r->enabled) > - continue; > - p->aggregate(node, r->tag, r->avg_bw, r->peak_bw, > + if (r->enabled) { > + avg_bw = r->avg_bw; > + peak_bw = r->peak_bw; > + } else { > + avg_bw = 0; > + peak_bw = 0; > + } > + p->aggregate(node, r->tag, avg_bw, peak_bw, > &node->avg_bw, &node->peak_bw); > }
diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c index 37d5ec970cc1..5174dcb31ab7 100644 --- a/drivers/interconnect/core.c +++ b/drivers/interconnect/core.c @@ -243,6 +243,7 @@ static int aggregate_requests(struct icc_node *node) { struct icc_provider *p = node->provider; struct icc_req *r; + u32 avg_bw, peak_bw; node->avg_bw = 0; node->peak_bw = 0; @@ -251,9 +252,14 @@ static int aggregate_requests(struct icc_node *node) p->pre_aggregate(node); hlist_for_each_entry(r, &node->req_list, req_node) { - if (!r->enabled) - continue; - p->aggregate(node, r->tag, r->avg_bw, r->peak_bw, + if (r->enabled) { + avg_bw = r->avg_bw; + peak_bw = r->peak_bw; + } else { + avg_bw = 0; + peak_bw = 0; + } + p->aggregate(node, r->tag, avg_bw, peak_bw, &node->avg_bw, &node->peak_bw); }
When an interconnect path is being disabled, currently we don't aggregate the requests for it afterwards. But the re-aggregation step shouldn't be skipped, as it may leave the nodes with outdated bandwidth data. This outdated data may actually keep the path still enabled and prevent the device from going into lower power states. Reported-by: Atul Dhudase <adhudase@codeaurora.org> Fixes: 7d374b209083 ("interconnect: Add helpers for enabling/disabling a path") Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> --- drivers/interconnect/core.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-)