[PATCH v2 03/10] s390/cio: Add support for FCES status notification

Stefan Haberland
2020-10-08T13:13:43Z

From: Vineeth Vijayan <vneethv@linux.ibm.com>

Fibre Channel Endpoint-Security event is received as an sei:nt0 type
in the CIO layer. This information needs to be shared with the
CCW device drivers using the path_events callback.

Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Co-developed-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
---
arch/s390/include/asm/ccwdev.h | 2 ++
drivers/s390/cio/chp.h | 1 +
drivers/s390/cio/chsc.c | 62 +++++++++++++++++++++++++++++-----
drivers/s390/cio/device.c | 15 +++++++-
4 files changed, 70 insertions(+), 10 deletions(-)

diff --git a/arch/s390/include/asm/ccwdev.h b/arch/s390/include/asm/ccwdev.h
index 3cfe1eb89838..14e1bbfd969e 100644
--- a/arch/s390/include/asm/ccwdev.h
+++ b/arch/s390/include/asm/ccwdev.h
@@ -104,6 +104,8 @@ struct ccw_device {
was successfully verified. */
#define PE_PATHGROUP_ESTABLISHED 0x4 /* A pathgroup was reset and had
to be established again. */
+#define PE_PATH_FCES_EVENT 0x8 /* The FCES Status of a path has
+ * changed. */

/*
* Possible CIO actions triggered by the unit check handler.
diff --git a/drivers/s390/cio/chp.h b/drivers/s390/cio/chp.h
index 20259f3fbf45..7ee9eba0abcb 100644
--- a/drivers/s390/cio/chp.h
+++ b/drivers/s390/cio/chp.h
@@ -23,6 +23,7 @@
#define CHP_OFFLINE 1
#define CHP_VARY_ON 2
#define CHP_VARY_OFF 3
+#define CHP_FCES_EVENT 4

struct chp_link {
struct chp_id chpid;
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index 513fc5748d6e..04fbcfcf9e42 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -37,6 +37,9 @@ static void *sei_page;
static void *chsc_page;
static DEFINE_SPINLOCK(chsc_page_lock);

+#define SEI_VF_FLA 0xc0 /* VF flag for Full Link Address */
+#define SEI_RS_CHPID 0x4 /* 4 in RS field indicates CHPID */
+
/**
* chsc_error_from_response() - convert a chsc response to an error
* @response: chsc response code
@@ -285,6 +288,15 @@ static void s390_process_res_acc(struct chp_link *link)
css_schedule_reprobe();
}

+static int process_fces_event(struct subchannel *sch, void *data)
+{
+ spin_lock_irq(sch->lock);
+ if (sch->driver && sch->driver->chp_event)
+ sch->driver->chp_event(sch, data, CHP_FCES_EVENT);
+ spin_unlock_irq(sch->lock);
+ return 0;
+}
+
struct chsc_sei_nt0_area {
u8 flags;
u8 vf; /* validity flags */
@@ -362,6 +374,16 @@ static char *store_ebcdic(char *dest, const char *src, unsigned long len,
return dest + len;
}

+static void chsc_link_from_sei(struct chp_link *link,
+ struct chsc_sei_nt0_area *sei_area)
+{
+ if ((sei_area->vf & SEI_VF_FLA) != 0) {
+ link->fla = sei_area->fla;
+ link->fla_mask = ((sei_area->vf & SEI_VF_FLA) == SEI_VF_FLA) ?
+ 0xffff : 0xff00;
+ }
+}
+
/* Format node ID and parameters for output in LIR log message. */
static void format_node_data(char *params, char *id, struct node_descriptor *nd)
{
@@ -451,15 +473,7 @@ static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
}
memset(&link, 0, sizeof(struct chp_link));
link.chpid = chpid;
- if ((sei_area->vf & 0xc0) != 0) {
- link.fla = sei_area->fla;
- if ((sei_area->vf & 0xc0) == 0xc0)
- /* full link address */
- link.fla_mask = 0xffff;
- else
- /* link address */
- link.fla_mask = 0xff00;
- }
+ chsc_link_from_sei(&link, sei_area);
s390_process_res_acc(&link);
}

@@ -568,6 +582,33 @@ static void chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area)
ap_bus_cfg_chg();
}

+static void chsc_process_sei_fces_event(struct chsc_sei_nt0_area *sei_area)
+{
+ struct chp_link link;
+ struct chp_id chpid;
+ struct channel_path *chp;
+
+ CIO_CRW_EVENT(4,
+ "chsc: FCES status notification (rs=%02x, rs_id=%04x, FCES-status=%x)\n",
+ sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
+
+ if (sei_area->rs != SEI_RS_CHPID)
+ return;
+ chp_id_init(&chpid);
+ chpid.id = sei_area->rsid;
+
+ /* Ignore the event on unknown/invalid chp */
+ chp = chpid_to_chp(chpid);
+ if (!chp)
+ return;
+
+ memset(&link, 0, sizeof(struct chp_link));
+ link.chpid = chpid;
+ chsc_link_from_sei(&link, sei_area);
+
+ for_each_subchannel_staged(process_fces_event, NULL, &link);
+}
+
static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
{
switch (sei_area->cc) {
@@ -609,6 +650,9 @@ static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
case 14: /* scm available notification */
chsc_process_sei_scm_avail(sei_area);
break;
+ case 15: /* FCES event notification */
+ chsc_process_sei_fces_event(sei_area);
+ break;
default: /* other stuff */
CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
sei_area->cc);
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index b29fe8d50baf..aab13c78db9f 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -1170,7 +1170,8 @@ static int io_subchannel_chp_event(struct subchannel *sch,
struct chp_link *link, int event)
{
struct ccw_device *cdev = sch_get_cdev(sch);
- int mask;
+ int mask, chpid, valid_bit;
+ int path_event[8];

mask = chp_ssd_get_mask(&sch->ssd_info, link);
if (!mask)
@@ -1205,6 +1206,18 @@ static int io_subchannel_chp_event(struct subchannel *sch,
cdev->private->path_new_mask |= mask;
io_subchannel_verify(sch);
break;
+ case CHP_FCES_EVENT:
+ /* Forward Endpoint Security event */
+ for (chpid = 0, valid_bit = 0x80; chpid < 8; chpid++,
+ valid_bit >>= 1) {
+ if (mask & valid_bit)
+ path_event[chpid] = PE_PATH_FCES_EVENT;
+ else
+ path_event[chpid] = PE_NONE;
+ }
+ if (cdev)
+ cdev->drv->path_event(cdev, path_event);
+ break;
}
return 0;
}
--
2.17.1