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[68.147.8.254]) by smtp.gmail.com with ESMTPSA id o11sm5532224pgd.58.2020.04.24.13.01.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Apr 2020 13:01:52 -0700 (PDT) From: Mathieu Poirier To: bjorn.andersson@linaro.org, ohad@wizery.com Cc: loic.pallardy@st.com, arnaud.pouliquen@st.com, s-anna@ti.com, linux-remoteproc@vger.kernel.org, corbet@lwn.net, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 12/14] remoteproc: Introducing function rproc_set_state_machine() Date: Fri, 24 Apr 2020 14:01:33 -0600 Message-Id: <20200424200135.28825-13-mathieu.poirier@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200424200135.28825-1-mathieu.poirier@linaro.org> References: <20200424200135.28825-1-mathieu.poirier@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introducting function rproc_set_state_machine() to add operations and a set of flags to use when synchronising with a remote processor. Signed-off-by: Mathieu Poirier --- drivers/remoteproc/remoteproc_core.c | 54 ++++++++++++++++++++++++ drivers/remoteproc/remoteproc_internal.h | 6 +++ include/linux/remoteproc.h | 3 ++ 3 files changed, 63 insertions(+) diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index 48afa1f80a8f..5c48714e8702 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -2065,6 +2065,59 @@ int devm_rproc_add(struct device *dev, struct rproc *rproc) } EXPORT_SYMBOL(devm_rproc_add); +/** + * rproc_set_state_machine() - Set a synchronisation ops and set of flags + * to use with a remote processor + * @rproc: The remote processor to work with + * @sync_ops: The operations to use when synchronising with a remote + * processor + * @sync_flags: The flags to use when deciding if the remoteproc core + * should be synchronising with a remote processor + * + * Returns 0 on success, an error code otherwise. + */ +int rproc_set_state_machine(struct rproc *rproc, + const struct rproc_ops *sync_ops, + struct rproc_sync_flags sync_flags) +{ + if (!rproc || !sync_ops) + return -EINVAL; + + /* + * No point in going further if we never have to synchronise with + * the remote processor. + */ + if (!sync_flags.on_init && + !sync_flags.after_stop && !sync_flags.after_crash) + return 0; + + /* + * Refuse to go further if remoteproc operations have been allocated + * but they will never be used. + */ + if (rproc->ops && sync_flags.on_init && + sync_flags.after_stop && sync_flags.after_crash) + return -EINVAL; + + /* + * Don't allow users to set this more than once to avoid situations + * where the remote processor can't be recovered. + */ + if (rproc->sync_ops) + return -EINVAL; + + rproc->sync_ops = kmemdup(sync_ops, sizeof(*sync_ops), GFP_KERNEL); + if (!rproc->sync_ops) + return -ENOMEM; + + rproc->sync_flags = sync_flags; + /* Tell the core what to do when initialising */ + rproc_set_sync_flag(rproc, RPROC_SYNC_STATE_INIT); + + return 0; +} +EXPORT_SYMBOL(rproc_set_state_machine); + /** * rproc_type_release() - release a remote processor instance * @dev: the rproc's device @@ -2088,6 +2141,7 @@ static void rproc_type_release(struct device *dev) kfree_const(rproc->firmware); kfree_const(rproc->name); kfree(rproc->ops); + kfree(rproc->sync_ops); kfree(rproc); } diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h index 7dcc0a26892b..c1a293a37c78 100644 --- a/drivers/remoteproc/remoteproc_internal.h +++ b/drivers/remoteproc/remoteproc_internal.h @@ -27,6 +27,8 @@ struct rproc_debug_trace { /* * enum rproc_sync_states - remote processsor sync states * + * @RPROC_SYNC_STATE_INIT state to use when the remoteproc core + * is initialising. * @RPROC_SYNC_STATE_SHUTDOWN state to use after the remoteproc core * has shutdown (rproc_shutdown()) the * remote processor. @@ -39,6 +41,7 @@ struct rproc_debug_trace { * operation to use. */ enum rproc_sync_states { + RPROC_SYNC_STATE_INIT, RPROC_SYNC_STATE_SHUTDOWN, RPROC_SYNC_STATE_CRASHED, }; @@ -47,6 +50,9 @@ static inline void rproc_set_sync_flag(struct rproc *rproc, enum rproc_sync_states state) { switch (state) { + case RPROC_SYNC_STATE_INIT: + rproc->sync_with_rproc = rproc->sync_flags.on_init; + break; case RPROC_SYNC_STATE_SHUTDOWN: rproc->sync_with_rproc = rproc->sync_flags.after_stop; break; diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h index ceb3b2bba824..a75ed92b3de6 100644 --- a/include/linux/remoteproc.h +++ b/include/linux/remoteproc.h @@ -619,6 +619,9 @@ struct rproc *rproc_get_by_child(struct device *dev); struct rproc *rproc_alloc(struct device *dev, const char *name, const struct rproc_ops *ops, const char *firmware, int len); +int rproc_set_state_machine(struct rproc *rproc, + const struct rproc_ops *sync_ops, + struct rproc_sync_flags sync_flags); void rproc_put(struct rproc *rproc); int rproc_add(struct rproc *rproc); int rproc_del(struct rproc *rproc); -- 2.20.1