| Message ID | 20230424110933.3908-3-quic_mkshah@quicinc.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere, archived |
| Headers | show |
| Series | Use PSCI OS initiated mode for sc7280 | expand |
On Mon, 24 Apr 2023 at 13:10, Maulik Shah <quic_mkshah@quicinc.com> wrote: > > A switch from OSI to PC mode is only possible if all CPUs other than the > calling one are OFF, either through a call to CPU_OFF or not yet booted. > > Currently OSI mode is enabled before power domains are created. In cases > where CPUidle states are not using hierarchical CPU topology the bail out > path tries to switch back to PC mode which gets denied by firmware since > other CPUs are online at this point and creates inconsistent state as > firmware is in OSI mode and Linux in PC mode. > > This change moves enabling OSI mode after power domains are created, > this would makes sure that hierarchical CPU topology is used before > switching firmware to OSI mode. > > Fixes: 70c179b49870 ("cpuidle: psci: Allow PM domain to be initialized even if no OSI mode") > Signed-off-by: Maulik Shah <quic_mkshah@quicinc.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Bjorn, can you pick up this series for 6.4-rc[n]? Moreover, I think it would be a good idea to tag both patch 1 and patch 2 for stable kernels. Kind regards Uffe > --- > drivers/cpuidle/cpuidle-psci-domain.c | 39 +++++++++------------------ > 1 file changed, 13 insertions(+), 26 deletions(-) > > diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/cpuidle-psci-domain.c > index c2d6d9c3c930..b88af1262f1a 100644 > --- a/drivers/cpuidle/cpuidle-psci-domain.c > +++ b/drivers/cpuidle/cpuidle-psci-domain.c > @@ -120,20 +120,6 @@ static void psci_pd_remove(void) > } > } > > -static bool psci_pd_try_set_osi_mode(void) > -{ > - int ret; > - > - if (!psci_has_osi_support()) > - return false; > - > - ret = psci_set_osi_mode(true); > - if (ret) > - return false; > - > - return true; > -} > - > static void psci_cpuidle_domain_sync_state(struct device *dev) > { > /* > @@ -152,15 +138,12 @@ static int psci_cpuidle_domain_probe(struct platform_device *pdev) > { > struct device_node *np = pdev->dev.of_node; > struct device_node *node; > - bool use_osi; > + bool use_osi = psci_has_osi_support(); > int ret = 0, pd_count = 0; > > if (!np) > return -ENODEV; > > - /* If OSI mode is supported, let's try to enable it. */ > - use_osi = psci_pd_try_set_osi_mode(); > - > /* > * Parse child nodes for the "#power-domain-cells" property and > * initialize a genpd/genpd-of-provider pair when it's found. > @@ -170,33 +153,37 @@ static int psci_cpuidle_domain_probe(struct platform_device *pdev) > continue; > > ret = psci_pd_init(node, use_osi); > - if (ret) > - goto put_node; > + if (ret) { > + of_node_put(node); > + goto exit; > + } > > pd_count++; > } > > /* Bail out if not using the hierarchical CPU topology. */ > if (!pd_count) > - goto no_pd; > + return 0; > > /* Link genpd masters/subdomains to model the CPU topology. */ > ret = dt_idle_pd_init_topology(np); > if (ret) > goto remove_pd; > > + /* let's try to enable OSI. */ > + ret = psci_set_osi_mode(use_osi); > + if (ret) > + goto remove_pd; > + > pr_info("Initialized CPU PM domain topology using %s mode\n", > use_osi ? "OSI" : "PC"); > return 0; > > -put_node: > - of_node_put(node); > remove_pd: > + dt_idle_pd_remove_topology(np); > psci_pd_remove(); > +exit: > pr_err("failed to create CPU PM domains ret=%d\n", ret); > -no_pd: > - if (use_osi) > - psci_set_osi_mode(false); > return ret; > } > > -- > 2.17.1 >
diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/cpuidle-psci-domain.c index c2d6d9c3c930..b88af1262f1a 100644 --- a/drivers/cpuidle/cpuidle-psci-domain.c +++ b/drivers/cpuidle/cpuidle-psci-domain.c @@ -120,20 +120,6 @@ static void psci_pd_remove(void) } } -static bool psci_pd_try_set_osi_mode(void) -{ - int ret; - - if (!psci_has_osi_support()) - return false; - - ret = psci_set_osi_mode(true); - if (ret) - return false; - - return true; -} - static void psci_cpuidle_domain_sync_state(struct device *dev) { /* @@ -152,15 +138,12 @@ static int psci_cpuidle_domain_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct device_node *node; - bool use_osi; + bool use_osi = psci_has_osi_support(); int ret = 0, pd_count = 0; if (!np) return -ENODEV; - /* If OSI mode is supported, let's try to enable it. */ - use_osi = psci_pd_try_set_osi_mode(); - /* * Parse child nodes for the "#power-domain-cells" property and * initialize a genpd/genpd-of-provider pair when it's found. @@ -170,33 +153,37 @@ static int psci_cpuidle_domain_probe(struct platform_device *pdev) continue; ret = psci_pd_init(node, use_osi); - if (ret) - goto put_node; + if (ret) { + of_node_put(node); + goto exit; + } pd_count++; } /* Bail out if not using the hierarchical CPU topology. */ if (!pd_count) - goto no_pd; + return 0; /* Link genpd masters/subdomains to model the CPU topology. */ ret = dt_idle_pd_init_topology(np); if (ret) goto remove_pd; + /* let's try to enable OSI. */ + ret = psci_set_osi_mode(use_osi); + if (ret) + goto remove_pd; + pr_info("Initialized CPU PM domain topology using %s mode\n", use_osi ? "OSI" : "PC"); return 0; -put_node: - of_node_put(node); remove_pd: + dt_idle_pd_remove_topology(np); psci_pd_remove(); +exit: pr_err("failed to create CPU PM domains ret=%d\n", ret); -no_pd: - if (use_osi) - psci_set_osi_mode(false); return ret; }
A switch from OSI to PC mode is only possible if all CPUs other than the calling one are OFF, either through a call to CPU_OFF or not yet booted. Currently OSI mode is enabled before power domains are created. In cases where CPUidle states are not using hierarchical CPU topology the bail out path tries to switch back to PC mode which gets denied by firmware since other CPUs are online at this point and creates inconsistent state as firmware is in OSI mode and Linux in PC mode. This change moves enabling OSI mode after power domains are created, this would makes sure that hierarchical CPU topology is used before switching firmware to OSI mode. Fixes: 70c179b49870 ("cpuidle: psci: Allow PM domain to be initialized even if no OSI mode") Signed-off-by: Maulik Shah <quic_mkshah@quicinc.com> --- drivers/cpuidle/cpuidle-psci-domain.c | 39 +++++++++------------------ 1 file changed, 13 insertions(+), 26 deletions(-)