From eb59eca0d8ac15f8c1b7f1cd35999455a90292c0 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Mon, 6 Mar 2023 08:56:31 +0100 Subject: interconnect: fix provider registration API The current interconnect provider interface is inherently racy as providers are expected to be added before being fully initialised. Specifically, nodes are currently not added and the provider data is not initialised until after registering the provider which can cause racing DT lookups to fail. Add a new provider API which will be used to fix up the interconnect drivers. The old API is reimplemented using the new interface and will be removed once all drivers have been fixed. Fixes: 11f1ceca7031 ("interconnect: Add generic on-chip interconnect API") Fixes: 87e3031b6fbd ("interconnect: Allow endpoints translation via DT") Cc: stable@vger.kernel.org # 5.1 Reviewed-by: Konrad Dybcio Signed-off-by: Johan Hovold Tested-by: Luca Ceresoli # i.MX8MP MSC SM2-MB-EP1 Board Link: https://lore.kernel.org/r/20230306075651.2449-4-johan+linaro@kernel.org Signed-off-by: Georgi Djakov --- include/linux/interconnect-provider.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'include/linux/interconnect-provider.h') diff --git a/include/linux/interconnect-provider.h b/include/linux/interconnect-provider.h index cd5c5a27557f..d12cd18aab3f 100644 --- a/include/linux/interconnect-provider.h +++ b/include/linux/interconnect-provider.h @@ -122,6 +122,9 @@ int icc_link_destroy(struct icc_node *src, struct icc_node *dst); void icc_node_add(struct icc_node *node, struct icc_provider *provider); void icc_node_del(struct icc_node *node); int icc_nodes_remove(struct icc_provider *provider); +void icc_provider_init(struct icc_provider *provider); +int icc_provider_register(struct icc_provider *provider); +void icc_provider_deregister(struct icc_provider *provider); int icc_provider_add(struct icc_provider *provider); void icc_provider_del(struct icc_provider *provider); struct icc_node_data *of_icc_get_from_provider(struct of_phandle_args *spec); @@ -167,6 +170,15 @@ static inline int icc_nodes_remove(struct icc_provider *provider) return -ENOTSUPP; } +static inline void icc_provider_init(struct icc_provider *provider) { } + +static inline int icc_provider_register(struct icc_provider *provider) +{ + return -ENOTSUPP; +} + +static inline void icc_provider_deregister(struct icc_provider *provider) { } + static inline int icc_provider_add(struct icc_provider *provider) { return -ENOTSUPP; -- cgit v1.2.3-70-g09d2 From 419405c92299d793b95053aa54d95e2d3f45a1a4 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Mon, 6 Mar 2023 08:56:49 +0100 Subject: interconnect: drop racy registration API Now that all interconnect drivers have been converted to the new provider registration API, the old racy interface can be removed. Reviewed-by: Konrad Dybcio Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20230306075651.2449-22-johan+linaro@kernel.org Signed-off-by: Georgi Djakov --- drivers/interconnect/core.c | 16 ---------------- include/linux/interconnect-provider.h | 11 ----------- 2 files changed, 27 deletions(-) (limited to 'include/linux/interconnect-provider.h') diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c index 4175a42bf748..da456329c524 100644 --- a/drivers/interconnect/core.c +++ b/drivers/interconnect/core.c @@ -1084,22 +1084,6 @@ void icc_provider_deregister(struct icc_provider *provider) } EXPORT_SYMBOL_GPL(icc_provider_deregister); -int icc_provider_add(struct icc_provider *provider) -{ - icc_provider_init(provider); - - return icc_provider_register(provider); -} -EXPORT_SYMBOL_GPL(icc_provider_add); - -void icc_provider_del(struct icc_provider *provider) -{ - WARN_ON(!list_empty(&provider->nodes)); - - icc_provider_deregister(provider); -} -EXPORT_SYMBOL_GPL(icc_provider_del); - static const struct of_device_id __maybe_unused ignore_list[] = { { .compatible = "qcom,sc7180-ipa-virt" }, { .compatible = "qcom,sc8180x-ipa-virt" }, diff --git a/include/linux/interconnect-provider.h b/include/linux/interconnect-provider.h index d12cd18aab3f..b9af9016a95e 100644 --- a/include/linux/interconnect-provider.h +++ b/include/linux/interconnect-provider.h @@ -125,8 +125,6 @@ int icc_nodes_remove(struct icc_provider *provider); void icc_provider_init(struct icc_provider *provider); int icc_provider_register(struct icc_provider *provider); void icc_provider_deregister(struct icc_provider *provider); -int icc_provider_add(struct icc_provider *provider); -void icc_provider_del(struct icc_provider *provider); struct icc_node_data *of_icc_get_from_provider(struct of_phandle_args *spec); void icc_sync_state(struct device *dev); @@ -179,15 +177,6 @@ static inline int icc_provider_register(struct icc_provider *provider) static inline void icc_provider_deregister(struct icc_provider *provider) { } -static inline int icc_provider_add(struct icc_provider *provider) -{ - return -ENOTSUPP; -} - -static inline void icc_provider_del(struct icc_provider *provider) -{ -} - static inline struct icc_node_data *of_icc_get_from_provider(struct of_phandle_args *spec) { return ERR_PTR(-ENOTSUPP); -- cgit v1.2.3-70-g09d2 From b2d110cd5d28ded813f060b735cd68bfe2e5010f Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Mon, 6 Mar 2023 08:56:51 +0100 Subject: interconnect: drop unused icc_link_destroy() interface Now that the link array is deallocated when destroying nodes and the explicit link removal has been dropped from the exynos driver there are no further users of and no need for the icc_link_destroy() interface. Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20230306075651.2449-24-johan+linaro@kernel.org Signed-off-by: Georgi Djakov --- drivers/interconnect/core.c | 46 ----------------------------------- include/linux/interconnect-provider.h | 6 ----- 2 files changed, 52 deletions(-) (limited to 'include/linux/interconnect-provider.h') diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c index da456329c524..0edf85ba055e 100644 --- a/drivers/interconnect/core.c +++ b/drivers/interconnect/core.c @@ -910,52 +910,6 @@ out: } EXPORT_SYMBOL_GPL(icc_link_create); -/** - * icc_link_destroy() - destroy a link between two nodes - * @src: pointer to source node - * @dst: pointer to destination node - * - * Return: 0 on success, or an error code otherwise - */ -int icc_link_destroy(struct icc_node *src, struct icc_node *dst) -{ - struct icc_node **new; - size_t slot; - int ret = 0; - - if (IS_ERR_OR_NULL(src)) - return -EINVAL; - - if (IS_ERR_OR_NULL(dst)) - return -EINVAL; - - mutex_lock(&icc_lock); - - for (slot = 0; slot < src->num_links; slot++) - if (src->links[slot] == dst) - break; - - if (WARN_ON(slot == src->num_links)) { - ret = -ENXIO; - goto out; - } - - src->links[slot] = src->links[--src->num_links]; - - new = krealloc(src->links, src->num_links * sizeof(*src->links), - GFP_KERNEL); - if (new) - src->links = new; - else - ret = -ENOMEM; - -out: - mutex_unlock(&icc_lock); - - return ret; -} -EXPORT_SYMBOL_GPL(icc_link_destroy); - /** * icc_node_add() - add interconnect node to interconnect provider * @node: pointer to the interconnect node diff --git a/include/linux/interconnect-provider.h b/include/linux/interconnect-provider.h index b9af9016a95e..e6d8aca6886d 100644 --- a/include/linux/interconnect-provider.h +++ b/include/linux/interconnect-provider.h @@ -118,7 +118,6 @@ int icc_std_aggregate(struct icc_node *node, u32 tag, u32 avg_bw, struct icc_node *icc_node_create(int id); void icc_node_destroy(int id); int icc_link_create(struct icc_node *node, const int dst_id); -int icc_link_destroy(struct icc_node *src, struct icc_node *dst); void icc_node_add(struct icc_node *node, struct icc_provider *provider); void icc_node_del(struct icc_node *node); int icc_nodes_remove(struct icc_provider *provider); @@ -150,11 +149,6 @@ static inline int icc_link_create(struct icc_node *node, const int dst_id) return -ENOTSUPP; } -static inline int icc_link_destroy(struct icc_node *src, struct icc_node *dst) -{ - return -ENOTSUPP; -} - static inline void icc_node_add(struct icc_node *node, struct icc_provider *provider) { } -- cgit v1.2.3-70-g09d2