On Mon, Jul 21, 2014 at 02:47:43PM -0400, Erik Arfvidson wrote:
> This patch adds virthba debugfs directory and info entry
>
> Signed-off-by: Erik Arfvidson <erik.arfvid...@unisys.com>
> Signed-off-by: Benjamin Romer <benjamin.ro...@unisys.com>
> ---
> drivers/staging/unisys/virthba/virthba.c | 79
> ++++++++++++++++++++++++++++++++
> 1 file changed, 79 insertions(+)
>
> diff --git a/drivers/staging/unisys/virthba/virthba.c
> b/drivers/staging/unisys/virthba/virthba.c
> index b9cbcf2..121cc05 100644
> --- a/drivers/staging/unisys/virthba/virthba.c
> +++ b/drivers/staging/unisys/virthba/virthba.c
> @@ -50,6 +50,7 @@
> #include <scsi/scsi_cmnd.h>
> #include <scsi/scsi_device.h>
> #include <asm/param.h>
> +#include <linux/debugfs.h>
> #include <linux/types.h>
>
> #include "virthba.h"
> @@ -66,6 +67,11 @@
> /* NOTE: L1_CACHE_BYTES >=128 */
> #define DEVICE_ATTRIBUTE struct device_attribute
>
> + /* MAX_BUF = 6 lines x 10 MAXVHBA x 80 characters
> + * = 4800 bytes ~ 2^13 = 8192 bytes
> + */
> +#define MAX_BUF 8192
> +
> /*****************************************************/
> /* Forward declarations */
> /*****************************************************/
> @@ -104,6 +110,8 @@ static int virthba_serverup(struct virtpci_dev
> *virtpcidev);
> static int virthba_serverdown(struct virtpci_dev *virtpcidev, u32 state);
> static void doDiskAddRemove(struct work_struct *work);
> static void virthba_serverdown_complete(struct work_struct *work);
> +static ssize_t info_debugfs_read(struct file *file, char __user *buf,
> + size_t len, loff_t *offset);
>
> /*****************************************************/
> /* Globals */
> @@ -221,9 +229,18 @@ struct virthba_devices_open {
> struct virthba_info *virthbainfo;
> };
>
> +static const struct file_operations debugfs_info_fops = {
> + .read = info_debugfs_read,
> +};
> +
> +/*****************************************************/
> +/* Structs */
> +/*****************************************************/
> +
> #define VIRTHBASOPENMAX 1
> /* array of open devices maintained by open() and close(); */
> static struct virthba_devices_open VirtHbasOpen[VIRTHBASOPENMAX];
> +static struct dentry *virthba_debugfs_dir;
>
> /*****************************************************/
> /* Local Functions */
> @@ -1342,6 +1359,62 @@ process_incoming_rsps(void *v)
> complete_and_exit(&dc->threadinfo.has_stopped, 0);
> }
>
> +/*****************************************************/
> +/* Debugfs filesystem functions */
> +/*****************************************************/
> +
> +static ssize_t info_debugfs_read(struct file *file,
> + char __user *buf, size_t len, loff_t *offset)
> +{
> + ssize_t bytes_read = 0;
> + int str_pos = 0;
> + U64 phys_flags_addr;
> + int i;
> + struct virthba_info *virthbainfo;
> + char *vbuf;
> +
> + if (len > MAX_BUF)
> + len = MAX_BUF;
> + vbuf = kzalloc(len, GFP_KERNEL);
> + if (!vbuf)
> + return -ENOMEM;
> +
> + for (i = 0; i < VIRTHBASOPENMAX; i++) {
> + if (VirtHbasOpen[i].virthbainfo == NULL)
> + continue;
> +
> + virthbainfo = VirtHbasOpen[i].virthbainfo;
> +
> + str_pos += scnprintf(vbuf + str_pos,
> + len - str_pos, "MaxBuffLen:%u\n", MaxBuffLen);
> +
> + str_pos += scnprintf(vbuf + str_pos, len - str_pos,
> + "\nvirthba result queue poll wait:%d usecs.\n",
> + rsltq_wait_usecs);
> + str_pos += scnprintf(vbuf + str_pos, len - str_pos,
> + "\ninterrupts_rcvd = %llu, interrupts_disabled
> = %llu\n",
> + virthbainfo->interrupts_rcvd,
> + virthbainfo->interrupts_disabled);
> + str_pos += scnprintf(vbuf + str_pos,
> + len - str_pos, "\ninterrupts_notme = %llu,\n",
> + virthbainfo->interrupts_notme);
> + phys_flags_addr = virt_to_phys((__force void *)
> + virthbainfo->flags_addr);
> + str_pos += scnprintf(vbuf + str_pos, len - str_pos,
> + "flags_addr = %p, phys_flags_addr=0x%016llx,
> FeatureFlags=%llu\n",
> + virthbainfo->flags_addr, phys_flags_addr,
> + (__le64)readq(virthbainfo->flags_addr));
> + str_pos += scnprintf(vbuf + str_pos,
> + len - str_pos, "acquire_failed_cnt:%llu\n",
> + virthbainfo->acquire_failed_cnt);
> + str_pos += scnprintf(vbuf + str_pos, len - str_pos, "\n");
> + }
> +
> + bytes_read = simple_read_from_buffer(buf, len, offset, vbuf, str_pos);
> + kfree(vbuf);
> + return bytes_read;
> +}
> +
> /* As per VirtpciFunc returns 1 for success and 0 for failure */
> static int
> virthba_serverup(struct virtpci_dev *virtpcidev)
> @@ -1526,6 +1599,10 @@ virthba_mod_init(void)
> POSTCODE_SEVERITY_ERR);
> } else {
>
> + /* create the debugfs directories and entries */
> + virthba_debugfs_dir = debugfs_create_dir("virthba", NULL);
> + debugfs_create_file("info", S_IRUSR, virthba_debugfs_dir,
> + NULL, &debugfs_info_fops);
Shouldn't you have one unisys-named debugfs top-level directory that you
can put your "virtpci" and "virthba" subdirs into? Seems odd for a
single driver to be creating multiple top-level debugfs subdirs.
I'll take this for now, but please fix this up in the future.
> + /* remove debugfs directory and files. */
> + debugfs_remove_recursive(virthba_debugfs_dir);
Again, the function name is self-descriptive, this comment is a waste...
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