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From:   Suman Anna <s-anna@ti.com>
To:     Bjorn Andersson <bjorn.andersson@linaro.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>
CC:     <linux-remoteproc@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, Suman Anna <s-anna@ti.com>
Subject: [PATCH 2/2] remoteproc: Fix various kernel-doc warnings
Date:   Wed, 19 May 2021 13:03:04 -0500
Message-ID: <20210519180304.23563-3-s-anna@ti.com>
In-Reply-To: <20210519180304.23563-1-s-anna@ti.com>
References: <20210519180304.23563-1-s-anna@ti.com>
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Fix all the kernel-doc warnings in various remoteproc core files.
Some of them just needed a formatting cleanup change, while others
needed the Return statement to be added, or documenting the missed
structure elements.

Signed-off-by: Suman Anna <s-anna@ti.com>
---
 drivers/remoteproc/remoteproc_core.c       | 44 +++++++++++++------
 drivers/remoteproc/remoteproc_elf_loader.c | 12 ++++--
 drivers/remoteproc/remoteproc_virtio.c     |  6 ++-
 include/linux/remoteproc.h                 | 50 ++++++++++++----------
 4 files changed, 69 insertions(+), 43 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 8c279039b6a3..6348aaa42bbb 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -183,12 +183,12 @@ EXPORT_SYMBOL(rproc_va_to_pa);
  * translations on the internal remoteproc memory regions through a platform
  * implementation specific da_to_va ops, if present.
  *
- * The function returns a valid kernel address on success or NULL on failure.
- *
  * Note: phys_to_virt(iommu_iova_to_phys(rproc->domain, da)) will work too,
  * but only on kernel direct mapped RAM memory. Instead, we're just using
  * here the output of the DMA API for the carveouts, which should be more
  * correct.
+ *
+ * Return: a valid kernel address on success or NULL on failure
  */
 void *rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
 {
@@ -509,7 +509,7 @@ static int copy_dma_range_map(struct device *to, struct device *from)
  * use RSC_DEVMEM resource entries to map their required @da to the physical
  * address of their base CMA region (ouch, hacky!).
  *
- * Returns 0 on success, or an appropriate error code otherwise
+ * Return: 0 on success, or an appropriate error code otherwise
  */
 static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
 			     int offset, int avail)
@@ -644,7 +644,7 @@ void rproc_vdev_release(struct kref *ref)
  * support dynamically allocating this address using the generic
  * DMA API (but currently there isn't a use case for that).
  *
- * Returns 0 on success, or an appropriate error code otherwise
+ * Return: 0 on success, or an appropriate error code otherwise
  */
 static int rproc_handle_trace(struct rproc *rproc, void *ptr,
 			      int offset, int avail)
@@ -721,6 +721,8 @@ static int rproc_handle_trace(struct rproc *rproc, void *ptr,
  * tell us ranges of physical addresses the firmware is allowed to request,
  * and not allow firmwares to request access to physical addresses that
  * are outside those ranges.
+ *
+ * Return: 0 on success, or an appropriate error code otherwise
  */
 static int rproc_handle_devmem(struct rproc *rproc, void *ptr,
 			       int offset, int avail)
@@ -783,6 +785,8 @@ static int rproc_handle_devmem(struct rproc *rproc, void *ptr,
  *
  * This function allocate specified memory entry @mem using
  * dma_alloc_coherent() as default allocator
+ *
+ * Return: 0 on success, or an appropriate error code otherwise
  */
 static int rproc_alloc_carveout(struct rproc *rproc,
 				struct rproc_mem_entry *mem)
@@ -889,6 +893,8 @@ static int rproc_alloc_carveout(struct rproc *rproc,
  *
  * This function releases specified memory entry @mem allocated via
  * rproc_alloc_carveout() function by @rproc.
+ *
+ * Return: 0 on success, or an appropriate error code otherwise
  */
 static int rproc_release_carveout(struct rproc *rproc,
 				  struct rproc_mem_entry *mem)
@@ -918,6 +924,8 @@ static int rproc_release_carveout(struct rproc *rproc,
  * (e.g. CMA) more efficiently, and also minimizes the number of TLB entries
  * needed to map it (in case @rproc is using an IOMMU). Reducing the TLB
  * pressure is important; it may have a substantial impact on performance.
+ *
+ * Return: 0 on success, or an appropriate error code otherwise
  */
 static int rproc_handle_carveout(struct rproc *rproc,
 				 void *ptr, int offset, int avail)
@@ -1006,6 +1014,8 @@ EXPORT_SYMBOL(rproc_add_carveout);
  *
  * This function allocates a rproc_mem_entry struct and fill it with parameters
  * provided by client.
+ *
+ * Return: a valid pointer on success, or NULL on failure
  */
 __printf(8, 9)
 struct rproc_mem_entry *
@@ -1050,6 +1060,8 @@ EXPORT_SYMBOL(rproc_mem_entry_init);
  *
  * This function allocates a rproc_mem_entry struct and fill it with parameters
  * provided by client.
+ *
+ * Return: a valid pointer on success, or NULL on failure
  */
 __printf(5, 6)
 struct rproc_mem_entry *
@@ -1881,6 +1893,8 @@ static int __rproc_detach(struct rproc *rproc)
  * remoteproc functional again.
  *
  * This function can sleep, so it cannot be called from atomic context.
+ *
+ * Return: 0 on success or a negative value upon failure
  */
 int rproc_trigger_recovery(struct rproc *rproc)
 {
@@ -1965,7 +1979,7 @@ static void rproc_crash_handler_work(struct work_struct *work)
  * If the remote processor is already powered on, this function immediately
  * returns (successfully).
  *
- * Returns 0 on success, and an appropriate error value otherwise.
+ * Return: 0 on success, and an appropriate error value otherwise
  */
 int rproc_boot(struct rproc *rproc)
 {
@@ -2100,6 +2114,8 @@ EXPORT_SYMBOL(rproc_shutdown);
  * no longer available.  From there it should be possible to remove the
  * platform driver and even power cycle the application processor (if the HW
  * supports it) without needing to switch off the remote processor.
+ *
+ * Return: 0 on success, and an appropriate error value otherwise
  */
 int rproc_detach(struct rproc *rproc)
 {
@@ -2152,7 +2168,7 @@ EXPORT_SYMBOL(rproc_detach);
  * This function increments the remote processor's refcount, so always
  * use rproc_put() to decrement it back once rproc isn't needed anymore.
  *
- * Returns the rproc handle on success, and NULL on failure.
+ * Return: rproc handle on success, and NULL on failure
  */
 #ifdef CONFIG_OF
 struct rproc *rproc_get_by_phandle(phandle phandle)
@@ -2302,8 +2318,6 @@ static int rproc_validate(struct rproc *rproc)
  * This is called by the platform-specific rproc implementation, whenever
  * a new remote processor device is probed.
  *
- * Returns 0 on success and an appropriate error code otherwise.
- *
  * Note: this function initiates an asynchronous firmware loading
  * context, which will look for virtio devices supported by the rproc's
  * firmware.
@@ -2311,6 +2325,8 @@ static int rproc_validate(struct rproc *rproc)
  * If found, those virtio devices will be created and added, so as a result
  * of registering this remote processor, additional virtio drivers might be
  * probed.
+ *
+ * Return: 0 on success and an appropriate error code otherwise
  */
 int rproc_add(struct rproc *rproc)
 {
@@ -2364,7 +2380,7 @@ static void devm_rproc_remove(void *rproc)
  * This function performs like rproc_add() but the registered rproc device will
  * automatically be removed on driver detach.
  *
- * Returns: 0 on success, negative errno on failure
+ * Return: 0 on success, negative errno on failure
  */
 int devm_rproc_add(struct device *dev, struct rproc *rproc)
 {
@@ -2472,10 +2488,10 @@ static int rproc_alloc_ops(struct rproc *rproc, const struct rproc_ops *ops)
  * implementations should then call rproc_add() to complete
  * the registration of the remote processor.
  *
- * On success the new rproc is returned, and on failure, NULL.
- *
  * Note: _never_ directly deallocate @rproc, even if it was not registered
  * yet. Instead, when you need to unroll rproc_alloc(), use rproc_free().
+ *
+ * Return: new rproc pointer on success, and NULL on failure
  */
 struct rproc *rproc_alloc(struct device *dev, const char *name,
 			  const struct rproc_ops *ops,
@@ -2588,7 +2604,7 @@ EXPORT_SYMBOL(rproc_put);
  * of the outstanding reference created by rproc_alloc. To decrement that
  * one last refcount, one still needs to call rproc_free().
  *
- * Returns 0 on success and -EINVAL if @rproc isn't valid.
+ * Return: 0 on success and -EINVAL if @rproc isn't valid
  */
 int rproc_del(struct rproc *rproc)
 {
@@ -2635,7 +2651,7 @@ static void devm_rproc_free(struct device *dev, void *res)
  * This function performs like rproc_alloc() but the acquired rproc device will
  * automatically be released on driver detach.
  *
- * Returns: new rproc instance, or NULL on failure
+ * Return: new rproc instance, or NULL on failure
  */
 struct rproc *devm_rproc_alloc(struct device *dev, const char *name,
 			       const struct rproc_ops *ops,
@@ -2687,7 +2703,7 @@ EXPORT_SYMBOL(rproc_remove_subdev);
  * rproc_get_by_child() - acquire rproc handle of @dev's ancestor
  * @dev:	child device to find ancestor of
  *
- * Returns the ancestor rproc instance, or NULL if not found.
+ * Return: the ancestor rproc instance, or NULL if not found
  */
 struct rproc *rproc_get_by_child(struct device *dev)
 {
diff --git a/drivers/remoteproc/remoteproc_elf_loader.c b/drivers/remoteproc/remoteproc_elf_loader.c
index 11423588965a..469c52e62faf 100644
--- a/drivers/remoteproc/remoteproc_elf_loader.c
+++ b/drivers/remoteproc/remoteproc_elf_loader.c
@@ -31,6 +31,8 @@
  * @fw: the ELF firmware image
  *
  * Make sure this fw image is sane (ie a correct ELF32/ELF64 file).
+ *
+ * Return: 0 on success and -EINVAL upon any failure
  */
 int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw)
 {
@@ -117,11 +119,11 @@ EXPORT_SYMBOL(rproc_elf_sanity_check);
  * @rproc: the remote processor handle
  * @fw: the ELF firmware image
  *
- * This function returns the entry point address of the ELF
- * image.
- *
  * Note that the boot address is not a configurable property of all remote
  * processors. Some will always boot at a specific hard-coded address.
+ *
+ * Return: entry point address of the ELF image
+ *
  */
 u64 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
 {
@@ -152,6 +154,8 @@ EXPORT_SYMBOL(rproc_elf_get_boot_addr);
  * might be different: they might not have iommus, and would prefer to
  * directly allocate memory for every segment/resource. This is not yet
  * supported, though.
+ *
+ * Return: 0 on success and an appropriate error code otherwise
  */
 int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
 {
@@ -362,7 +366,7 @@ EXPORT_SYMBOL(rproc_elf_load_rsc_table);
  * This function finds the location of the loaded resource table. Don't
  * call this function if the table wasn't loaded yet - it's a bug if you do.
  *
- * Returns the pointer to the resource table if it is found or NULL otherwise.
+ * Return: pointer to the resource table if it is found or NULL otherwise.
  * If the table wasn't loaded yet the result is unspecified.
  */
 struct resource_table *rproc_elf_find_loaded_rsc_table(struct rproc *rproc,
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index 0cc617f76068..cf4d54e98e6a 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -45,7 +45,7 @@ static bool rproc_virtio_notify(struct virtqueue *vq)
  * when the remote processor signals that a specific virtqueue has pending
  * messages available.
  *
- * Returns IRQ_NONE if no message was found in the @notifyid virtqueue,
+ * Return: IRQ_NONE if no message was found in the @notifyid virtqueue,
  * and otherwise returns IRQ_HANDLED.
  */
 irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int notifyid)
@@ -325,7 +325,7 @@ static void rproc_virtio_dev_release(struct device *dev)
  * This function registers a virtio device. This vdev's partent is
  * the rproc device.
  *
- * Returns 0 on success or an appropriate error value otherwise.
+ * Return: 0 on success or an appropriate error value otherwise
  */
 int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
 {
@@ -432,6 +432,8 @@ int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
  * @data: must be null
  *
  * This function unregisters an existing virtio device.
+ *
+ * Return: 0
  */
 int rproc_remove_virtio_dev(struct device *dev, void *data)
 {
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 8b795b544f75..42a1f30e33a7 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -243,7 +243,7 @@ struct fw_rsc_trace {
  * @da: device address
  * @align: the alignment between the consumer and producer parts of the vring
  * @num: num of buffers supported by this vring (must be power of two)
- * @notifyid is a unique rproc-wide notify index for this vring. This notify
+ * @notifyid: a unique rproc-wide notify index for this vring. This notify
  * index is used when kicking a remote processor, to let it know that this
  * vring is triggered.
  * @pa: physical address
@@ -266,18 +266,18 @@ struct fw_rsc_vdev_vring {
 /**
  * struct fw_rsc_vdev - virtio device header
  * @id: virtio device id (as in virtio_ids.h)
- * @notifyid is a unique rproc-wide notify index for this vdev. This notify
+ * @notifyid: a unique rproc-wide notify index for this vdev. This notify
  * index is used when kicking a remote processor, to let it know that the
  * status/features of this vdev have changes.
- * @dfeatures specifies the virtio device features supported by the firmware
- * @gfeatures is a place holder used by the host to write back the
+ * @dfeatures: specifies the virtio device features supported by the firmware
+ * @gfeatures: a place holder used by the host to write back the
  * negotiated features that are supported by both sides.
- * @config_len is the size of the virtio config space of this vdev. The config
+ * @config_len: the size of the virtio config space of this vdev. The config
  * space lies in the resource table immediate after this vdev header.
- * @status is a place holder where the host will indicate its virtio progress.
- * @num_of_vrings indicates how many vrings are described in this vdev header
+ * @status: a place holder where the host will indicate its virtio progress.
+ * @num_of_vrings: indicates how many vrings are described in this vdev header
  * @reserved: reserved (must be zero)
- * @vring is an array of @num_of_vrings entries of 'struct fw_rsc_vdev_vring'.
+ * @vring: an array of @num_of_vrings entries of 'struct fw_rsc_vdev_vring'.
  *
  * This resource is a virtio device header: it provides information about
  * the vdev, and is then used by the host and its peer remote processors
@@ -287,16 +287,17 @@ struct fw_rsc_vdev_vring {
  * to statically allocate a vdev upon registration of the rproc (dynamic vdev
  * allocation is not yet supported).
  *
- * Note: unlike virtualization systems, the term 'host' here means
- * the Linux side which is running remoteproc to control the remote
- * processors. We use the name 'gfeatures' to comply with virtio's terms,
- * though there isn't really any virtualized guest OS here: it's the host
- * which is responsible for negotiating the final features.
- * Yeah, it's a bit confusing.
- *
- * Note: immediately following this structure is the virtio config space for
- * this vdev (which is specific to the vdev; for more info, read the virtio
- * spec). the size of the config space is specified by @config_len.
+ * Note:
+ * 1. unlike virtualization systems, the term 'host' here means
+ *    the Linux side which is running remoteproc to control the remote
+ *    processors. We use the name 'gfeatures' to comply with virtio's terms,
+ *    though there isn't really any virtualized guest OS here: it's the host
+ *    which is responsible for negotiating the final features.
+ *    Yeah, it's a bit confusing.
+ *
+ * 2. immediately following this structure is the virtio config space for
+ *    this vdev (which is specific to the vdev; for more info, read the virtio
+ *    spec). the size of the config space is specified by @config_len.
  */
 struct fw_rsc_vdev {
 	u32 id;
@@ -440,7 +441,7 @@ enum rproc_state {
  * enum rproc_crash_type - remote processor crash types
  * @RPROC_MMUFAULT:	iommu fault
  * @RPROC_WATCHDOG:	watchdog bite
- * @RPROC_FATAL_ERROR	fatal error
+ * @RPROC_FATAL_ERROR:	fatal error
  *
  * Each element of the enum is used as an array index. So that, the value of
  * the elements should be always something sane.
@@ -457,9 +458,9 @@ enum rproc_crash_type {
  * enum rproc_dump_mechanism - Coredump options for core
  * @RPROC_COREDUMP_DISABLED:	Don't perform any dump
  * @RPROC_COREDUMP_ENABLED:	Copy dump to separate buffer and carry on with
-				recovery
+ *				recovery
  * @RPROC_COREDUMP_INLINE:	Read segments directly from device memory. Stall
-				recovery until all segments are read
+ *				recovery until all segments are read
  */
 enum rproc_dump_mechanism {
 	RPROC_COREDUMP_DISABLED,
@@ -475,6 +476,7 @@ enum rproc_dump_mechanism {
  * @priv:	private data associated with the dump_segment
  * @dump:	custom dump function to fill device memory segment associated
  *		with coredump
+ * @offset:	offset of the segment
  */
 struct rproc_dump_segment {
 	struct list_head node;
@@ -524,7 +526,9 @@ struct rproc_dump_segment {
  * @auto_boot: flag to indicate if remote processor should be auto-started
  * @dump_segments: list of segments in the firmware
  * @nb_vdev: number of vdev currently handled by rproc
- * @char_dev: character device of the rproc
+ * @elf_class: firmware ELF class
+ * @elf_machine: firmware ELF machine
+ * @cdev: character device of the rproc
  * @cdev_put_on_release: flag to indicate if remoteproc should be shutdown on @char_dev release
  */
 struct rproc {
@@ -613,10 +617,10 @@ struct rproc_vring {
  * struct rproc_vdev - remoteproc state for a supported virtio device
  * @refcount: reference counter for the vdev and vring allocations
  * @subdev: handle for registering the vdev as a rproc subdevice
+ * @dev: device struct used for reference count semantics
  * @id: virtio device id (as in virtio_ids.h)
  * @node: list node
  * @rproc: the rproc handle
- * @vdev: the virio device
  * @vring: the vrings for this vdev
  * @rsc_offset: offset of the vdev's resource entry
  * @index: vdev position versus other vdev declared in resource table
-- 
2.30.1