diff options
Diffstat (limited to 'drivers/s390/char/sclp_ap.c')
| -rw-r--r-- | drivers/s390/char/sclp_ap.c | 63 |
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 0000000000..0dd1ca7127 --- /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); |