misc: genwqe: card_dev: Whole host of kerneldoc fixes

Including; add missing documentation for function arguments, re-ordering
of #defines i.e. not placed between kerneldoc headers and the functions
they are documenting, demotion of file header/comment from kerneldoc
format and removal of documentation for non-existent args.

Fixes the following W=1 kernel build warnings:

 drivers/misc/genwqe/card_dev.c:33: warning: Function parameter or member 'cd' not described in 'genwqe_open_files'
 drivers/misc/genwqe/card_dev.c:98: warning: Function parameter or member 'virt_addr' not described in 'genwqe_search_pin'
 drivers/misc/genwqe/card_dev.c:98: warning: Excess function parameter 'dma_addr' description in 'genwqe_search_pin'
 drivers/misc/genwqe/card_dev.c:154: warning: Function parameter or member 'virt_addr' not described in '__genwqe_search_mapping'
 drivers/misc/genwqe/card_dev.c:256: warning: Function parameter or member 'cd' not described in 'genwqe_kill_fasync'
 drivers/misc/genwqe/card_dev.c:256: warning: Function parameter or member 'sig' not described in 'genwqe_kill_fasync'
 drivers/misc/genwqe/card_dev.c:387: warning: Function parameter or member 'vma' not described in 'genwqe_vma_close'
 drivers/misc/genwqe/card_dev.c:430: warning: Function parameter or member 'filp' not described in 'genwqe_mmap'
 drivers/misc/genwqe/card_dev.c:430: warning: Function parameter or member 'vma' not described in 'genwqe_mmap'
 drivers/misc/genwqe/card_dev.c:495: warning: Excess function parameter 'cd' description in 'FLASH_BLOCK'
 drivers/misc/genwqe/card_dev.c:495: warning: Excess function parameter 'load' description in 'FLASH_BLOCK'
 drivers/misc/genwqe/card_dev.c:827: warning: Function parameter or member 'cfile' not described in 'ddcb_cmd_cleanup'
 drivers/misc/genwqe/card_dev.c:827: warning: Function parameter or member 'req' not described in 'ddcb_cmd_cleanup'
 drivers/misc/genwqe/card_dev.c:854: warning: Function parameter or member 'cfile' not described in 'ddcb_cmd_fixups'
 drivers/misc/genwqe/card_dev.c:854: warning: Function parameter or member 'req' not described in 'ddcb_cmd_fixups'
 drivers/misc/genwqe/card_dev.c:984: warning: Function parameter or member 'cfile' not described in 'genwqe_execute_ddcb'
 drivers/misc/genwqe/card_dev.c:984: warning: Function parameter or member 'cmd' not described in 'genwqe_execute_ddcb'
 drivers/misc/genwqe/card_dev.c:1350: warning: Function parameter or member 'cd' not described in 'genwqe_device_remove'

Cc: Michael Jung <mijung@gmx.net>
Cc: Michael Ruettger <michael@ibmra.de>
Cc: Frank Haverkamp <haver@linux.ibm.com>
Cc: Joerg-Stephan Vogt <jsvogt@de.ibm.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Frank Haverkamp <haver@linux.ibm.com>
Link: https://lore.kernel.org/r/20200701085853.164358-20-lee.jones@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/genwqe/card_dev.c

 // SPDX-License-Identifier: GPL-2.0-only
-/**
+/*
  * IBM Accelerator Family 'GenWQE'
  *
  * (C) Copyright IBM Corp. 2013
@@ -87,7 +87,7 @@ static int genwqe_del_pin(struct genwqe_file *cfile, struct dma_mapping *m)
  * @cfile:	Descriptor of opened file
  * @u_addr:	User virtual address
  * @size:	Size of buffer
- * @dma_addr:	DMA address to be updated
+ * @virt_addr:	Virtual address to be updated
  *
  * Return: Pointer to the corresponding mapping	NULL if not found
  */
@@ -144,6 +144,7 @@ static void __genwqe_del_mapping(struct genwqe_file *cfile,
  * @u_addr:	user virtual address
  * @size:	size of buffer
  * @dma_addr:	DMA address to be updated
+ * @virt_addr:	Virtual address to be updated
  * Return: Pointer to the corresponding mapping	NULL if not found
  */
 static struct dma_mapping *__genwqe_search_mapping(struct genwqe_file *cfile,
@@ -249,6 +250,8 @@ static void genwqe_remove_pinnings(struct genwqe_file *cfile)
 
 /**
  * genwqe_kill_fasync() - Send signal to all processes with open GenWQE files
+ * @cd: GenWQE device information
+ * @sig: Signal to send out
  *
  * E.g. genwqe_send_signal(cd, SIGIO);
  */
@@ -380,6 +383,7 @@ static void genwqe_vma_open(struct vm_area_struct *vma)
 
 /**
  * genwqe_vma_close() - Called each time when vma is unmapped
+ * @vma: VMA area to close
  *
  * Free memory which got allocated by GenWQE mmap().
  */
@@ -416,6 +420,8 @@ static const struct vm_operations_struct genwqe_vma_ops = {
 
 /**
  * genwqe_mmap() - Provide contignous buffers to userspace
+ * @filp:	File pointer (unused)
+ * @vma:	VMA area to map
  *
  * We use mmap() to allocate contignous buffers used for DMA
  * transfers. After the buffer is allocated we remap it to user-space
@@ -484,16 +490,15 @@ static int genwqe_mmap(struct file *filp, struct vm_area_struct *vma)
 	return rc;
 }
 
+#define	FLASH_BLOCK	0x40000	/* we use 256k blocks */
+
 /**
  * do_flash_update() - Excute flash update (write image or CVPD)
- * @cd:        genwqe device
+ * @cfile:	Descriptor of opened file
  * @load:      details about image load
  *
  * Return: 0 if successful
  */
-
-#define	FLASH_BLOCK	0x40000	/* we use 256k blocks */
-
 static int do_flash_update(struct genwqe_file *cfile,
 			   struct genwqe_bitstream *load)
 {
@@ -820,6 +825,8 @@ static int genwqe_unpin_mem(struct genwqe_file *cfile, struct genwqe_mem *m)
 
 /**
  * ddcb_cmd_cleanup() - Remove dynamically created fixup entries
+ * @cfile:	Descriptor of opened file
+ * @req:	DDCB work request
  *
  * Only if there are any. Pinnings are not removed.
  */
@@ -844,6 +851,8 @@ static int ddcb_cmd_cleanup(struct genwqe_file *cfile, struct ddcb_requ *req)
 
 /**
  * ddcb_cmd_fixups() - Establish DMA fixups/sglists for user memory references
+ * @cfile:	Descriptor of opened file
+ * @req:	DDCB work request
  *
  * Before the DDCB gets executed we need to handle the fixups. We
  * replace the user-space addresses with DMA addresses or do
@@ -974,6 +983,8 @@ static int ddcb_cmd_fixups(struct genwqe_file *cfile, struct ddcb_requ *req)
 
 /**
  * genwqe_execute_ddcb() - Execute DDCB using userspace address fixups
+ * @cfile:	Descriptor of opened file
+ * @cmd:        Command identifier (passed from user)
  *
  * The code will build up the translation tables or lookup the
  * contignous memory allocation table to find the right translations
@@ -1339,6 +1350,7 @@ static int genwqe_inform_and_stop_processes(struct genwqe_dev *cd)
 
 /**
  * genwqe_device_remove() - Remove genwqe's char device
+ * @cd: GenWQE device information
  *
  * This function must be called after the client devices are removed
  * because it will free the major/minor number range for the genwqe