| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|---|
| 2 | /* |
| 3 | * s390 crypto adapter related sclp functions. |
| 4 | * |
| 5 | * Copyright IBM Corp. 2020 |
| 6 | */ |
| 7 | #define KMSG_COMPONENT "sclp_cmd" |
| 8 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 9 | |
| 10 | #include <linux/export.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <asm/sclp.h> |
| 13 | #include "sclp.h" |
| 14 | |
| 15 | #define SCLP_CMDW_CONFIGURE_AP 0x001f0001 |
| 16 | #define SCLP_CMDW_DECONFIGURE_AP 0x001e0001 |
| 17 | |
| 18 | struct ap_cfg_sccb { |
| 19 | struct sccb_header header; |
| 20 | } __packed; |
| 21 | |
| 22 | static int do_ap_configure(sclp_cmdw_t cmd, u32 apid) |
| 23 | { |
| 24 | struct ap_cfg_sccb *sccb; |
| 25 | int rc; |
| 26 | |
| 27 | if (!SCLP_HAS_AP_RECONFIG) |
| 28 | return -EOPNOTSUPP; |
| 29 | |
| 30 | sccb = (struct ap_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 31 | if (!sccb) |
| 32 | return -ENOMEM; |
| 33 | |
| 34 | sccb->header.length = PAGE_SIZE; |
| 35 | cmd |= (apid & 0xFF) << 8; |
| 36 | rc = sclp_sync_request(command: cmd, sccb); |
| 37 | if (rc) |
| 38 | goto out; |
| 39 | switch (sccb->header.response_code) { |
| 40 | case 0x0020: case 0x0120: case 0x0440: case 0x0450: |
| 41 | break; |
| 42 | default: |
| 43 | pr_warn("configure AP adapter %u failed: cmd=0x%08x response=0x%04x\n", |
| 44 | apid, cmd, sccb->header.response_code); |
| 45 | rc = -EIO; |
| 46 | break; |
| 47 | } |
| 48 | out: |
| 49 | free_page((unsigned long) sccb); |
| 50 | return rc; |
| 51 | } |
| 52 | |
| 53 | int sclp_ap_configure(u32 apid) |
| 54 | { |
| 55 | return do_ap_configure(SCLP_CMDW_CONFIGURE_AP, apid); |
| 56 | } |
| 57 | EXPORT_SYMBOL(sclp_ap_configure); |
| 58 | |
| 59 | int sclp_ap_deconfigure(u32 apid) |
| 60 | { |
| 61 | return do_ap_configure(SCLP_CMDW_DECONFIGURE_AP, apid); |
| 62 | } |
| 63 | EXPORT_SYMBOL(sclp_ap_deconfigure); |
| 64 |