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path: root/drivers/s390/char/sclp_ap.c
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Diffstat (limited to 'drivers/s390/char/sclp_ap.c')
-rw-r--r--drivers/s390/char/sclp_ap.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp_ap.c b/drivers/s390/char/sclp_ap.c
new file mode 100644
index 000000000..0dd1ca712
--- /dev/null
+++ b/drivers/s390/char/sclp_ap.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * s390 crypto adapter related sclp functions.
+ *
+ * Copyright IBM Corp. 2020
+ */
+#define KMSG_COMPONENT "sclp_cmd"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/export.h>
+#include <linux/slab.h>
+#include <asm/sclp.h>
+#include "sclp.h"
+
+#define SCLP_CMDW_CONFIGURE_AP 0x001f0001
+#define SCLP_CMDW_DECONFIGURE_AP 0x001e0001
+
+struct ap_cfg_sccb {
+ struct sccb_header header;
+} __packed;
+
+static int do_ap_configure(sclp_cmdw_t cmd, u32 apid)
+{
+ struct ap_cfg_sccb *sccb;
+ int rc;
+
+ if (!SCLP_HAS_AP_RECONFIG)
+ return -EOPNOTSUPP;
+
+ sccb = (struct ap_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
+ if (!sccb)
+ return -ENOMEM;
+
+ sccb->header.length = PAGE_SIZE;
+ cmd |= (apid & 0xFF) << 8;
+ rc = sclp_sync_request(cmd, sccb);
+ if (rc)
+ goto out;
+ switch (sccb->header.response_code) {
+ case 0x0020: case 0x0120: case 0x0440: case 0x0450:
+ break;
+ default:
+ pr_warn("configure AP adapter %u failed: cmd=0x%08x response=0x%04x\n",
+ apid, cmd, sccb->header.response_code);
+ rc = -EIO;
+ break;
+ }
+out:
+ free_page((unsigned long) sccb);
+ return rc;
+}
+
+int sclp_ap_configure(u32 apid)
+{
+ return do_ap_configure(SCLP_CMDW_CONFIGURE_AP, apid);
+}
+EXPORT_SYMBOL(sclp_ap_configure);
+
+int sclp_ap_deconfigure(u32 apid)
+{
+ return do_ap_configure(SCLP_CMDW_DECONFIGURE_AP, apid);
+}
+EXPORT_SYMBOL(sclp_ap_deconfigure);