From 25419de1b8dda24f3e02478b12b724a9b0cc4e78 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Tue, 22 May 2018 16:38:08 +0530 Subject: [PATCH 1/5] PM / OPP: Fix shared OPP table support in dev_pm_opp_set_supported_hw() It should be fine to call dev_pm_opp_set_supported_hw() for all possible CPUs, even if some of them share the OPP table as the caller may not be aware of sharing policy. Lets increment the reference count of the OPP table and return its pointer. The caller need to call dev_pm_opp_put_supported_hw() the same number of times later on to drop all the references. To avoid adding another counter to count how many times dev_pm_opp_set_supported_hw() is called for the same OPP table, dev_pm_opp_put_supported_hw() frees the resources on the very first call made to it, assuming that the caller would be calling it sequentially for all the CPUs. We can revisit that if that assumption is broken in the future. Signed-off-by: Viresh Kumar --- drivers/opp/core.c | 26 +++++--------------------- 1 file changed, 5 insertions(+), 21 deletions(-) diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 6d3624ba89b6..481affb783f3 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -1157,7 +1157,6 @@ struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, unsigned int count) { struct opp_table *opp_table; - int ret; opp_table = dev_pm_opp_get_opp_table(dev); if (!opp_table) @@ -1166,29 +1165,20 @@ struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, /* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list)); - /* Do we already have a version hierarchy associated with opp_table? */ - if (opp_table->supported_hw) { - dev_err(dev, "%s: Already have supported hardware list\n", - __func__); - ret = -EBUSY; - goto err; - } + /* Another CPU that shares the OPP table has set the property ? */ + if (opp_table->supported_hw) + return opp_table; opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions), GFP_KERNEL); if (!opp_table->supported_hw) { - ret = -ENOMEM; - goto err; + dev_pm_opp_put_opp_table(opp_table); + return ERR_PTR(-ENOMEM); } opp_table->supported_hw_count = count; return opp_table; - -err: - dev_pm_opp_put_opp_table(opp_table); - - return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw); @@ -1205,12 +1195,6 @@ void dev_pm_opp_put_supported_hw(struct opp_table *opp_table) /* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list)); - if (!opp_table->supported_hw) { - pr_err("%s: Doesn't have supported hardware list\n", - __func__); - return; - } - kfree(opp_table->supported_hw); opp_table->supported_hw = NULL; opp_table->supported_hw_count = 0; From 878ec1a9f0e5a6b344c12fdc349ec7cb036c2a42 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Tue, 22 May 2018 16:38:08 +0530 Subject: [PATCH 2/5] PM / OPP: Fix shared OPP table support in dev_pm_opp_set_prop_name() It should be fine to call dev_pm_opp_set_prop_name() for all possible CPUs, even if some of them share the OPP table as the caller may not be aware of sharing policy. Lets increment the reference count of the OPP table and return its pointer. The caller need to call dev_pm_opp_put_prop_name() the same number of times later on to drop all the references. To avoid adding another counter to count how many times dev_pm_opp_set_prop_name() is called for the same OPP table, dev_pm_opp_put_prop_name() frees the resources on the very first call made to it, assuming that the caller would be calling it sequentially for all the CPUs. We can revisit that if that assumption is broken in the future. Signed-off-by: Viresh Kumar --- drivers/opp/core.c | 25 +++++-------------------- 1 file changed, 5 insertions(+), 20 deletions(-) diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 481affb783f3..86e8e2c1905f 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -1216,7 +1216,6 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw); struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name) { struct opp_table *opp_table; - int ret; opp_table = dev_pm_opp_get_opp_table(dev); if (!opp_table) @@ -1225,26 +1224,17 @@ struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name) /* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list)); - /* Do we already have a prop-name associated with opp_table? */ - if (opp_table->prop_name) { - dev_err(dev, "%s: Already have prop-name %s\n", __func__, - opp_table->prop_name); - ret = -EBUSY; - goto err; - } + /* Another CPU that shares the OPP table has set the property ? */ + if (opp_table->prop_name) + return opp_table; opp_table->prop_name = kstrdup(name, GFP_KERNEL); if (!opp_table->prop_name) { - ret = -ENOMEM; - goto err; + dev_pm_opp_put_opp_table(opp_table); + return ERR_PTR(-ENOMEM); } return opp_table; - -err: - dev_pm_opp_put_opp_table(opp_table); - - return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name); @@ -1261,11 +1251,6 @@ void dev_pm_opp_put_prop_name(struct opp_table *opp_table) /* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list)); - if (!opp_table->prop_name) { - pr_err("%s: Doesn't have a prop-name\n", __func__); - return; - } - kfree(opp_table->prop_name); opp_table->prop_name = NULL; From 779b783cfaa726cbe35317ae2c1968c5496a3a03 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Tue, 22 May 2018 16:38:08 +0530 Subject: [PATCH 3/5] PM / OPP: Fix shared OPP table support in dev_pm_opp_set_regulators() It should be fine to call dev_pm_opp_set_regulators() for all possible CPUs, even if some of them share the OPP table as the caller may not be aware of sharing policy. Lets increment the reference count of the OPP table and return its pointer. The caller need to call dev_pm_opp_put_regulators() the same number of times later on to drop all the references. To avoid adding another counter to count how many times dev_pm_opp_set_regulators() is called for the same OPP table, dev_pm_opp_put_regulators() frees the resources on the very first call made to it, assuming that the caller would be calling it sequentially for all the CPUs. We can revisit that if that assumption is broken in the future. Signed-off-by: Viresh Kumar --- drivers/opp/core.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 86e8e2c1905f..780c89a49d18 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -1320,11 +1320,9 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev, goto err; } - /* Already have regulators set */ - if (opp_table->regulators) { - ret = -EBUSY; - goto err; - } + /* Another CPU that shares the OPP table has set the regulators ? */ + if (opp_table->regulators) + return opp_table; opp_table->regulators = kmalloc_array(count, sizeof(*opp_table->regulators), @@ -1378,10 +1376,8 @@ void dev_pm_opp_put_regulators(struct opp_table *opp_table) { int i; - if (!opp_table->regulators) { - pr_err("%s: Doesn't have regulators set\n", __func__); - return; - } + if (!opp_table->regulators) + goto put_opp_table; /* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list)); @@ -1395,6 +1391,7 @@ void dev_pm_opp_put_regulators(struct opp_table *opp_table) opp_table->regulators = NULL; opp_table->regulator_count = 0; +put_opp_table: dev_pm_opp_put_opp_table(opp_table); } EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators); From 5019acc693d3183a19d4844f6e2d878ea2dd7ddd Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Tue, 22 May 2018 16:38:08 +0530 Subject: [PATCH 4/5] PM / OPP: Fix shared OPP table support in dev_pm_opp_register_set_opp_helper() It should be fine to call dev_pm_opp_register_set_opp_helper() for all possible CPUs, even if some of them share the OPP table as the caller may not be aware of sharing policy. Lets increment the reference count of the OPP table and return its pointer. The caller need to call dev_pm_opp_register_put_opp_helper() the same number of times later on to drop all the references. To avoid adding another counter to count how many times dev_pm_opp_register_set_opp_helper() is called for the same OPP table, dev_pm_opp_register_put_opp_helper() frees the resources on the very first call made to it, assuming that the caller would be calling it sequentially for all the CPUs. We can revisit that if that assumption is broken in the future. Signed-off-by: Viresh Kumar --- drivers/opp/core.c | 27 +++++---------------------- 1 file changed, 5 insertions(+), 22 deletions(-) diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 780c89a49d18..ab2f3fead6b1 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -1477,7 +1477,6 @@ struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, int (*set_opp)(struct dev_pm_set_opp_data *data)) { struct opp_table *opp_table; - int ret; if (!set_opp) return ERR_PTR(-EINVAL); @@ -1488,24 +1487,15 @@ struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, /* This should be called before OPPs are initialized */ if (WARN_ON(!list_empty(&opp_table->opp_list))) { - ret = -EBUSY; - goto err; + dev_pm_opp_put_opp_table(opp_table); + return ERR_PTR(-EBUSY); } - /* Already have custom set_opp helper */ - if (WARN_ON(opp_table->set_opp)) { - ret = -EBUSY; - goto err; - } - - opp_table->set_opp = set_opp; + /* Another CPU that shares the OPP table has set the helper ? */ + if (!opp_table->set_opp) + opp_table->set_opp = set_opp; return opp_table; - -err: - dev_pm_opp_put_opp_table(opp_table); - - return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper); @@ -1518,17 +1508,10 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper); */ void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table) { - if (!opp_table->set_opp) { - pr_err("%s: Doesn't have custom set_opp helper set\n", - __func__); - return; - } - /* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list)); opp_table->set_opp = NULL; - dev_pm_opp_put_opp_table(opp_table); } EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper); From 8a352fd8787cefcb19c25ca1390301f874797b9c Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Wed, 30 May 2018 15:19:38 +0530 Subject: [PATCH 5/5] OPP: Allow same OPP table to be used for multiple genpd The OPP binding says: Property: operating-points-v2 ... This can contain more than one phandle for power domain providers that provide multiple power domains. That is, one phandle for each power domain. If only one phandle is available, then the same OPP table will be used for all power domains provided by the power domain provider. But the OPP core isn't allowing the same OPP table to be used for multiple domains. Update dev_pm_opp_of_add_table_indexed() to allow that. Signed-off-by: Viresh Kumar Tested-by: Rajendra Nayak --- drivers/opp/of.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/drivers/opp/of.c b/drivers/opp/of.c index 6d15f05bfc28..7af0ddec936b 100644 --- a/drivers/opp/of.c +++ b/drivers/opp/of.c @@ -554,11 +554,24 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table); int dev_pm_opp_of_add_table_indexed(struct device *dev, int index) { struct device_node *opp_np; - int ret; + int ret, count; +again: opp_np = _opp_of_get_opp_desc_node(dev->of_node, index); - if (!opp_np) + if (!opp_np) { + /* + * If only one phandle is present, then the same OPP table + * applies for all index requests. + */ + count = of_count_phandle_with_args(dev->of_node, + "operating-points-v2", NULL); + if (count == 1 && index) { + index = 0; + goto again; + } + return -ENODEV; + } ret = _of_add_opp_table_v2(dev, opp_np); of_node_put(opp_np);