s390/cio: Provide Endpoint-Security Mode per CU

Add an interface in the CIO layer to retrieve the information about the
Endpoint-Security Mode (ESM) of the specified CU. The ESM values are
defined as 0-None, 1-Authenticated or 2, 3-Encrypted.

[vneethv@linux.ibm.com: cleaned-up and modified description]

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/arch/s390/include/asm/cio.h b/arch/s390/include/asm/cio.h
index 5c58756..e36cb67 100644 (file)
--- a/arch/s390/include/asm/cio.h
+++ b/arch/s390/include/asm/cio.h
@@ -373,5 +373,6 @@ int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta);
 int chsc_sstpi(void *page, void *result, size_t size);
 int chsc_stzi(void *page, void *result, size_t size);
 int chsc_sgib(u32 origin);
+int chsc_scud(u16 cu, u64 *esm, u8 *esm_valid);
 
 #endif

diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index fc06a40..4ea4665 100644 (file)
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -1428,3 +1428,86 @@ int chsc_sgib(u32 origin)
        return ret;
 }
 EXPORT_SYMBOL_GPL(chsc_sgib);
+
+#define SCUD_REQ_LEN   0x10 /* SCUD request block length */
+#define SCUD_REQ_CMD   0x4b /* SCUD Command Code */
+
+struct chse_cudb {
+       u16 flags:8;
+       u16 chp_valid:8;
+       u16 cu;
+       u32 esm_valid:8;
+       u32:24;
+       u8 chpid[8];
+       u32:32;
+       u32:32;
+       u8 esm[8];
+       u32 efla[8];
+} __packed;
+
+struct chsc_scud {
+       struct chsc_header request;
+       u16:4;
+       u16 fmt:4;
+       u16 cssid:8;
+       u16 first_cu;
+       u16:16;
+       u16 last_cu;
+       u32:32;
+       struct chsc_header response;
+       u16:4;
+       u16 fmt_resp:4;
+       u32:24;
+       struct chse_cudb cudb[];
+} __packed;
+
+/**
+ * chsc_scud() - Store control-unit description.
+ * @cu:                number of the control-unit
+ * @esm:       8 1-byte endpoint security mode values
+ * @esm_valid: validity mask for @esm
+ *
+ * Interface to retrieve information about the endpoint security
+ * modes for up to 8 paths of a control unit.
+ *
+ * Returns 0 on success.
+ */
+int chsc_scud(u16 cu, u64 *esm, u8 *esm_valid)
+{
+       struct chsc_scud *scud = chsc_page;
+       int ret;
+
+       spin_lock_irq(&chsc_page_lock);
+       memset(chsc_page, 0, PAGE_SIZE);
+       scud->request.length = SCUD_REQ_LEN;
+       scud->request.code = SCUD_REQ_CMD;
+       scud->fmt = 0;
+       scud->cssid = 0;
+       scud->first_cu = cu;
+       scud->last_cu = cu;
+
+       ret = chsc(scud);
+       if (!ret)
+               ret = chsc_error_from_response(scud->response.code);
+
+       if (!ret && (scud->response.length <= 8 || scud->fmt_resp != 0
+                       || !(scud->cudb[0].flags & 0x80)
+                       || scud->cudb[0].cu != cu)) {
+
+               CIO_MSG_EVENT(2, "chsc: scud failed rc=%04x, L2=%04x "
+                       "FMT=%04x, cudb.flags=%02x, cudb.cu=%04x",
+                       scud->response.code, scud->response.length,
+                       scud->fmt_resp, scud->cudb[0].flags, scud->cudb[0].cu);
+               ret = -EINVAL;
+       }
+
+       if (ret)
+               goto out;
+
+       memcpy(esm, scud->cudb[0].esm, sizeof(*esm));
+       *esm_valid = scud->cudb[0].esm_valid;
+out:
+       spin_unlock_irq(&chsc_page_lock);
+       return ret;
+}
+EXPORT_SYMBOL_GPL(chsc_scud);