260 lines
6.2 KiB
C
260 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2007,2012
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*
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* Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
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*/
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#define KMSG_COMPONENT "sclp_cmd"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/completion.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <asm/chpid.h>
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#include <asm/ctlreg.h>
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#include <asm/sclp.h>
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#include "sclp.h"
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/* CPU configuration related functions */
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#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
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#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
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/* Channel path configuration related functions */
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#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
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#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
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#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
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struct cpu_configure_sccb {
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struct sccb_header header;
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} __packed __aligned(8);
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struct chp_cfg_sccb {
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struct sccb_header header;
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u8 ccm;
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u8 reserved[6];
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u8 cssid;
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} __packed;
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struct chp_info_sccb {
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struct sccb_header header;
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u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
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u8 standby[SCLP_CHP_INFO_MASK_SIZE];
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u8 configured[SCLP_CHP_INFO_MASK_SIZE];
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u8 ccm;
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u8 reserved[6];
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u8 cssid;
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} __packed;
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static void sclp_sync_callback(struct sclp_req *req, void *data)
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{
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struct completion *completion = data;
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complete(completion);
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}
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int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
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{
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return sclp_sync_request_timeout(cmd, sccb, 0);
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}
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int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)
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{
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struct completion completion;
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struct sclp_req *request;
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int rc;
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request = kzalloc(sizeof(*request), GFP_KERNEL);
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if (!request)
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return -ENOMEM;
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if (timeout)
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request->queue_timeout = timeout;
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request->command = cmd;
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request->sccb = sccb;
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request->status = SCLP_REQ_FILLED;
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request->callback = sclp_sync_callback;
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request->callback_data = &completion;
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init_completion(&completion);
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rc = sclp_add_request(request);
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if (rc)
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goto out;
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wait_for_completion(&completion);
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if (request->status != SCLP_REQ_DONE) {
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pr_warn("sync request failed (cmd=0x%08x, status=0x%02x)\n",
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cmd, request->status);
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rc = -EIO;
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}
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out:
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kfree(request);
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return rc;
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}
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int _sclp_get_core_info(struct sclp_core_info *info)
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{
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struct read_cpu_info_sccb *sccb;
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int rc, length;
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if (!SCLP_HAS_CPU_INFO)
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return -EOPNOTSUPP;
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length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
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sccb = (void *)__get_free_pages(GFP_KERNEL | GFP_DMA | __GFP_ZERO, get_order(length));
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if (!sccb)
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return -ENOMEM;
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sccb->header.length = length;
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sccb->header.control_mask[2] = 0x80;
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rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
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SCLP_QUEUE_INTERVAL);
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if (rc)
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goto out;
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if (sccb->header.response_code != 0x0010) {
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pr_warn("readcpuinfo failed (response=0x%04x)\n",
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sccb->header.response_code);
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rc = -EIO;
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goto out;
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}
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sclp_fill_core_info(info, sccb);
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out:
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free_pages((unsigned long)sccb, get_order(length));
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return rc;
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}
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static int do_core_configure(sclp_cmdw_t cmd)
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{
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struct cpu_configure_sccb *sccb;
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int rc;
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if (!SCLP_HAS_CPU_RECONFIG)
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return -EOPNOTSUPP;
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/*
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* Use kmalloc to have a minimum alignment of 8 bytes and ensure sccb
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* is not going to cross a page boundary.
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*/
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sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
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if (!sccb)
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return -ENOMEM;
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sccb->header.length = sizeof(*sccb);
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rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
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if (rc)
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goto out;
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switch (sccb->header.response_code) {
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case 0x0020:
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case 0x0120:
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break;
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default:
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pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
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cmd, sccb->header.response_code);
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rc = -EIO;
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break;
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}
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out:
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kfree(sccb);
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return rc;
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}
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int sclp_core_configure(u8 core)
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{
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return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
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}
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int sclp_core_deconfigure(u8 core)
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{
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return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);
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}
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static int do_chp_configure(sclp_cmdw_t cmd)
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{
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struct chp_cfg_sccb *sccb;
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int rc;
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if (!SCLP_HAS_CHP_RECONFIG)
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return -EOPNOTSUPP;
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sccb = (struct chp_cfg_sccb *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
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if (!sccb)
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return -ENOMEM;
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sccb->header.length = sizeof(*sccb);
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rc = sclp_sync_request(cmd, sccb);
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if (rc)
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goto out;
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switch (sccb->header.response_code) {
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case 0x0020:
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case 0x0120:
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case 0x0440:
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case 0x0450:
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break;
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default:
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pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
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cmd, sccb->header.response_code);
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rc = -EIO;
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break;
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}
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out:
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free_page((unsigned long)sccb);
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return rc;
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}
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/**
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* sclp_chp_configure - perform configure channel-path sclp command
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* @chpid: channel-path ID
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*
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* Perform configure channel-path command sclp command for specified chpid.
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* Return 0 after command successfully finished, non-zero otherwise.
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*/
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int sclp_chp_configure(struct chp_id chpid)
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{
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return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
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}
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/**
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* sclp_chp_deconfigure - perform deconfigure channel-path sclp command
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* @chpid: channel-path ID
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*
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* Perform deconfigure channel-path command sclp command for specified chpid
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* and wait for completion. On success return 0. Return non-zero otherwise.
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*/
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int sclp_chp_deconfigure(struct chp_id chpid)
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{
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return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
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}
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/**
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* sclp_chp_read_info - perform read channel-path information sclp command
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* @info: resulting channel-path information data
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*
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* Perform read channel-path information sclp command and wait for completion.
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* On success, store channel-path information in @info and return 0. Return
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* non-zero otherwise.
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*/
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int sclp_chp_read_info(struct sclp_chp_info *info)
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{
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struct chp_info_sccb *sccb;
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int rc;
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if (!SCLP_HAS_CHP_INFO)
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return -EOPNOTSUPP;
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sccb = (struct chp_info_sccb *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
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if (!sccb)
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return -ENOMEM;
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sccb->header.length = sizeof(*sccb);
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rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
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if (rc)
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goto out;
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if (sccb->header.response_code != 0x0010) {
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pr_warn("read channel-path info failed (response=0x%04x)\n",
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sccb->header.response_code);
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rc = -EIO;
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goto out;
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}
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memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
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memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
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memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
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out:
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free_page((unsigned long)sccb);
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return rc;
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}
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