Re: [PATCH v3] xen-scsiback: define a pr_fmt macro with xen-pvscsi

From: Chentao (Boby)
Date: Mon Mar 09 2015 - 09:57:21 EST

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On 2015/3/6 20:53, Juergen Gross wrote:

On 03/06/2015 09:34 PM, Tao Chen wrote:

Add the {xen-pvscsi: } prefix in pr_fmt and remove DPRINTK, then
replace all DPRINTK with pr_debug.

Also fixed up some comments just as eliminate redundant whitespace
and format the code.

These will make the code easier to read.

Signed-off-by: Tao Chen <boby.chen@xxxxxxxxxx>
---
drivers/xen/xen-scsiback.c | 72
++++++++++++++++++++++++----------------------
1 file changed, 37 insertions(+), 35 deletions(-)

diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
index 9faca6a..919397e 100644
--- a/drivers/xen/xen-scsiback.c
+++ b/drivers/xen/xen-scsiback.c
@@ -69,8 +69,10 @@
#include <xen/interface/grant_table.h>
#include <xen/interface/io/vscsiif.h>

-#define DPRINTK(_f, _a...) \
- pr_debug("(file=%s, line=%d) " _f, __FILE__ , __LINE__ , ## _a)
+#ifdef pr_fmt
+#undef pr_fmt
+#endif
+#define pr_fmt(fmt) "xen-pvscsi: " fmt

Have you looked around in the kernel how pr_fmt() is used normally?
You can spare 3 lines by placing the #define above all #include lines.

Many thanks for pointing out my mistake. I will correct it.

#define VSCSI_VERSION "v0.1"
#define VSCSI_NAMELEN 32
@@ -271,7 +273,7 @@ static void scsiback_print_status(char
*sense_buffer, int errors,
{
struct scsiback_tpg *tpg = pending_req->v2p->tpg;

- pr_err("xen-pvscsi[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x
host=%02x drv=%02x\n",
+ pr_err("[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x
drv=%02x\n",
tpg->tport->tport_name, pending_req->v2p->lun,
pending_req->cmnd[0], status_byte(errors), msg_byte(errors),
host_byte(errors), driver_byte(errors));
@@ -427,7 +429,7 @@ static int scsiback_gnttab_data_map_batch(struct
gnttab_map_grant_ref *map,
BUG_ON(err);
for (i = 0; i < cnt; i++) {
if (unlikely(map[i].status != GNTST_okay)) {
- pr_err("xen-pvscsi: invalid buffer -- could not remap
it\n");
+ pr_err("invalid buffer -- could not remap it\n");
map[i].handle = SCSIBACK_INVALID_HANDLE;
err = -ENOMEM;
} else {
@@ -449,7 +451,7 @@ static int scsiback_gnttab_data_map_list(struct
vscsibk_pend *pending_req,
for (i = 0; i < cnt; i++) {
if (get_free_page(pg + mapcount)) {
put_free_pages(pg, mapcount);
- pr_err("xen-pvscsi: no grant page\n");
+ pr_err("no grant page\n");
return -ENOMEM;
}
gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]),
@@ -492,7 +494,7 @@ static int scsiback_gnttab_data_map(struct
vscsiif_request *ring_req,
return 0;

if (nr_segments > VSCSIIF_SG_TABLESIZE) {
- DPRINTK("xen-pvscsi: invalid parameter nr_seg = %d\n",
+ pr_debug("invalid parameter nr_seg = %d\n",
ring_req->nr_segments);
return -EINVAL;
}
@@ -516,13 +518,13 @@ static int scsiback_gnttab_data_map(struct
vscsiif_request *ring_req,
nr_segments += n_segs;
}
if (nr_segments > SG_ALL) {
- DPRINTK("xen-pvscsi: invalid nr_seg = %d\n",
+ pr_debug("invalid nr_seg = %d\n",
nr_segments);

Above 2 lines fit into a single one now.

I will correct it.

return -EINVAL;
}
}

- /* free of (sgl) in fast_flush_area()*/
+ /* free of (sgl) in fast_flush_area() */
pending_req->sgl = kmalloc_array(nr_segments,
sizeof(struct scatterlist), GFP_KERNEL);
if (!pending_req->sgl)
@@ -679,7 +681,7 @@ static int prepare_pending_reqs(struct
vscsibk_info *info,
v2p = scsiback_do_translation(info, &vir);
if (!v2p) {
pending_req->v2p = NULL;
- DPRINTK("xen-pvscsi: doesn't exist.\n");
+ pr_debug("doesn't exist.\n");

Without the line information this message is pretty meaningless.

For this suggestion, I want to modify this print like below

pr_debug("the v2p of (chn:%d, tgt:%d, lun:%d) doesn't exist.\n",
vir.chn, vir.tgt, vir.lun);

What do you think, Juergen?

return -ENODEV;
}
pending_req->v2p = v2p;
@@ -690,14 +692,14 @@ static int prepare_pending_reqs(struct
vscsibk_info *info,
(pending_req->sc_data_direction != DMA_TO_DEVICE) &&
(pending_req->sc_data_direction != DMA_FROM_DEVICE) &&
(pending_req->sc_data_direction != DMA_NONE)) {
- DPRINTK("xen-pvscsi: invalid parameter data_dir = %d\n",
+ pr_debug("invalid parameter data_dir = %d\n",
pending_req->sc_data_direction);
return -EINVAL;
}

pending_req->cmd_len = ring_req->cmd_len;
if (pending_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) {
- DPRINTK("xen-pvscsi: invalid parameter cmd_len = %d\n",
+ pr_debug("invalid parameter cmd_len = %d\n",
pending_req->cmd_len);
return -EINVAL;
}
@@ -721,7 +723,7 @@ static int scsiback_do_cmd_fn(struct vscsibk_info
*info)

if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) {
rc = ring->rsp_prod_pvt;
- pr_warn("xen-pvscsi: Dom%d provided bogus ring requests (%#x
- %#x = %u). Halting ring processing\n",
+ pr_warn("Dom%d provided bogus ring requests (%#x - %#x = %u).
Halting ring processing\n",
info->domid, rp, rc, rp - rc);
info->ring_error = 1;
return 0;
@@ -772,7 +774,7 @@ static int scsiback_do_cmd_fn(struct vscsibk_info
*info)
scsiback_device_action(pending_req, TMR_LUN_RESET, 0);
break;
default:
- pr_err_ratelimited("xen-pvscsi: invalid request\n");
+ pr_err_ratelimited("invalid request\n");
scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24,
0, pending_req);
kmem_cache_free(scsiback_cachep, pending_req);
@@ -874,14 +876,14 @@ static int scsiback_add_translation_entry(struct
vscsibk_info *info,

lunp = strrchr(phy, ':');
if (!lunp) {
- pr_err("xen-pvscsi: illegal format of physical device %s\n",
+ pr_err("illegal format of physical device %s\n",
phy);

Merge lines.

I will correct it.

return -EINVAL;
}
*lunp = 0;
lunp++;
if (kstrtouint(lunp, 10, &lun) || lun >=
TRANSPORT_MAX_LUNS_PER_TPG) {
- pr_err("xen-pvscsi: lun number not valid: %s\n", lunp);
+ pr_err("lun number not valid: %s\n", lunp);
return -EINVAL;
}

@@ -909,7 +911,7 @@ static int scsiback_add_translation_entry(struct
vscsibk_info *info,
mutex_unlock(&scsiback_mutex);

if (!tpg) {
- pr_err("xen-pvscsi: %s:%d %s\n", phy, lun, error);
+ pr_err("%s:%d %s\n", phy, lun, error);
return -ENODEV;
}

@@ -926,7 +928,7 @@ static int scsiback_add_translation_entry(struct
vscsibk_info *info,
if ((entry->v.chn == v->chn) &&
(entry->v.tgt == v->tgt) &&
(entry->v.lun == v->lun)) {
- pr_warn("xen-pvscsi: Virtual ID is already used.
Assignment was not performed.\n");
+ pr_warn("Virtual ID is already used. Assignment was not
performed.\n");
err = -EEXIST;
goto out;
}
@@ -997,7 +999,7 @@ static void scsiback_do_add_lun(struct
vscsibk_info *info, const char *state,
if (!scsiback_add_translation_entry(info, phy, vir)) {
if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
"%d", XenbusStateInitialised)) {
- pr_err("xen-pvscsi: xenbus_printf error %s\n", state);
+ pr_err("xenbus_printf error %s\n", state);
scsiback_del_translation_entry(info, vir);
}
} else {
@@ -1012,7 +1014,7 @@ static void scsiback_do_del_lun(struct
vscsibk_info *info, const char *state,
if (!scsiback_del_translation_entry(info, vir)) {
if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
"%d", XenbusStateClosed))
- pr_err("xen-pvscsi: xenbus_printf error %s\n", state);
+ pr_err("xenbus_printf error %s\n", state);
}
}

@@ -1071,7 +1073,7 @@ static void scsiback_do_1lun_hotplug(struct
vscsibk_info *info, int op,
/* modify vscsi-devs/dev-x/state */
if (xenbus_printf(XBT_NIL, dev->nodename, state,
"%d", XenbusStateConnected)) {
- pr_err("xen-pvscsi: xenbus_printf error %s\n",
+ pr_err("xenbus_printf error %s\n",
str);

Merge lines.

I will correct it.

scsiback_del_translation_entry(info, &vir);
xenbus_printf(XBT_NIL, dev->nodename, state,
@@ -1079,7 +1081,7 @@ static void scsiback_do_1lun_hotplug(struct
vscsibk_info *info, int op,
}
}
break;
- /*When it is necessary, processing is added here.*/
+ /* When it is necessary, processing is added here. */
default:
break;
}
@@ -1196,7 +1198,7 @@ static int scsiback_probe(struct xenbus_device
*dev,
struct vscsibk_info *info = kzalloc(sizeof(struct vscsibk_info),
GFP_KERNEL);

- DPRINTK("%p %d\n", dev, dev->otherend_id);
+ pr_debug("%p %d\n", dev, dev->otherend_id);

Meaningless without more info.

For this suggestion, I want to modify this print like below

pr_debug("%s %p %d\n", __func__, dev, dev->otherend_id);

What do you think, Juergen?

Juergen

if (!info) {
xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure");
@@ -1227,7 +1229,7 @@ static int scsiback_probe(struct xenbus_device
*dev,
return 0;

fail:
- pr_warn("xen-pvscsi: %s failed\n", __func__);
+ pr_warn("%s failed\n", __func__);
scsiback_remove(dev);

return err;
@@ -1432,7 +1434,7 @@ check_len:
}
snprintf(&tport->tport_name[0], VSCSI_NAMELEN, "%s", &name[off]);

- pr_debug("xen-pvscsi: Allocated emulated Target %s Address: %s\n",
+ pr_debug("Allocated emulated Target %s Address: %s\n",
scsiback_dump_proto_id(tport), name);

return &tport->tport_wwn;
@@ -1443,7 +1445,7 @@ static void scsiback_drop_tport(struct se_wwn *wwn)
struct scsiback_tport *tport = container_of(wwn,
struct scsiback_tport, tport_wwn);

- pr_debug("xen-pvscsi: Deallocating emulated Target %s Address:
%s\n",
+ pr_debug("Deallocating emulated Target %s Address: %s\n",
scsiback_dump_proto_id(tport), tport->tport_name);

kfree(tport);
@@ -1470,8 +1472,8 @@ static u32 scsiback_tpg_get_inst_index(struct
se_portal_group *se_tpg)
static int scsiback_check_stop_free(struct se_cmd *se_cmd)
{
/*
- * Do not release struct se_cmd's containing a valid TMR
- * pointer. These will be released directly in
scsiback_device_action()
+ * Do not release struct se_cmd's containing a valid TMR pointer.
+ * These will be released directly in scsiback_device_action()
* with transport_generic_free_cmd().
*/
if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
@@ -1637,7 +1639,7 @@ static int scsiback_make_nexus(struct
scsiback_tpg *tpg,
return -ENOMEM;
}
/*
- * Initialize the struct se_session pointer
+ * Initialize the struct se_session pointer
*/
tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
if (IS_ERR(tv_nexus->tvn_se_sess)) {
@@ -1708,7 +1710,7 @@ static int scsiback_drop_nexus(struct
scsiback_tpg *tpg)
return -EBUSY;
}

- pr_debug("xen-pvscsi: Removing I_T Nexus to emulated %s Initiator
Port: %s\n",
+ pr_debug("Removing I_T Nexus to emulated %s Initiator Port: %s\n",
scsiback_dump_proto_id(tpg->tport),
tv_nexus->tvn_se_sess->se_node_acl->initiatorname);

@@ -1754,7 +1756,7 @@ static ssize_t scsiback_tpg_store_nexus(struct
se_portal_group *se_tpg,
unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr;
int ret;
/*
- * Shutdown the active I_T nexus if 'NULL' is passed..
+ * Shutdown the active I_T nexus if 'NULL' is passed.
*/
if (!strncmp(page, "NULL", 4)) {
ret = scsiback_drop_nexus(tpg);
@@ -1925,7 +1927,7 @@ static void scsiback_drop_tpg(struct
se_portal_group *se_tpg)
*/
scsiback_drop_nexus(tpg);
/*
- * Deregister the se_tpg from TCM..
+ * Deregister the se_tpg from TCM.
*/
core_tpg_deregister(se_tpg);
kfree(tpg);
@@ -1995,7 +1997,7 @@ static int scsiback_register_configfs(void)
struct target_fabric_configfs *fabric;
int ret;

- pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n",
+ pr_debug("fabric module %s on %s/%s on "UTS_RELEASE"\n",
VSCSI_VERSION, utsname()->sysname, utsname()->machine);
/*
* Register the top level struct config_item_type with TCM core
@@ -2032,7 +2034,7 @@ static int scsiback_register_configfs(void)
* Setup our local pointer to *fabric
*/
scsiback_fabric_configfs = fabric;
- pr_debug("xen-pvscsi: Set fabric -> scsiback_fabric_configfs\n");
+ pr_debug("Set fabric -> scsiback_fabric_configfs\n");
return 0;
};

@@ -2043,7 +2045,7 @@ static void scsiback_deregister_configfs(void)

target_fabric_configfs_deregister(scsiback_fabric_configfs);
scsiback_fabric_configfs = NULL;
- pr_debug("xen-pvscsi: Cleared scsiback_fabric_configfs\n");
+ pr_debug("Cleared scsiback_fabric_configfs\n");
};

static const struct xenbus_device_id scsiback_ids[] = {
@@ -2094,7 +2096,7 @@ out_unregister_xenbus:
xenbus_unregister_driver(&scsiback_driver);
out_cache_destroy:
kmem_cache_destroy(scsiback_cachep);
- pr_err("xen-pvscsi: %s: error %d\n", __func__, ret);
+ pr_err("%s: error %d\n", __func__, ret);
return ret;
}

.

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Next message: Linus Walleij: "Re: [PATCH] gpio-dwapb: reset mask register on probe"
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