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398 lines
9.5 KiB
398 lines
9.5 KiB
/*
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* drivers/s390/char/sclp_cmd.c
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*
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* Copyright IBM Corp. 2007
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* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
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* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
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*/
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#include <linux/completion.h>
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#include <linux/init.h>
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#include <linux/errno.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/sclp.h>
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#include "sclp.h"
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#define TAG "sclp_cmd: "
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#define SCLP_CMDW_READ_SCP_INFO 0x00020001
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#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
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struct read_info_sccb {
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struct sccb_header header; /* 0-7 */
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u16 rnmax; /* 8-9 */
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u8 rnsize; /* 10 */
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u8 _reserved0[24 - 11]; /* 11-15 */
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u8 loadparm[8]; /* 24-31 */
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u8 _reserved1[48 - 32]; /* 32-47 */
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u64 facilities; /* 48-55 */
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u8 _reserved2[84 - 56]; /* 56-83 */
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u8 fac84; /* 84 */
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u8 _reserved3[91 - 85]; /* 85-90 */
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u8 flags; /* 91 */
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u8 _reserved4[100 - 92]; /* 92-99 */
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u32 rnsize2; /* 100-103 */
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u64 rnmax2; /* 104-111 */
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u8 _reserved5[4096 - 112]; /* 112-4095 */
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} __attribute__((packed, aligned(PAGE_SIZE)));
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static struct read_info_sccb __initdata early_read_info_sccb;
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static int __initdata early_read_info_sccb_valid;
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u64 sclp_facilities;
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static u8 sclp_fac84;
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static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
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{
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int rc;
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__ctl_set_bit(0, 9);
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rc = sclp_service_call(cmd, sccb);
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if (rc)
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goto out;
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__load_psw_mask(PSW_BASE_BITS | PSW_MASK_EXT |
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PSW_MASK_WAIT | PSW_DEFAULT_KEY);
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local_irq_disable();
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out:
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/* Contents of the sccb might have changed. */
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barrier();
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__ctl_clear_bit(0, 9);
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return rc;
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}
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void __init sclp_read_info_early(void)
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{
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int rc;
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int i;
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struct read_info_sccb *sccb;
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sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
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SCLP_CMDW_READ_SCP_INFO};
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sccb = &early_read_info_sccb;
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for (i = 0; i < ARRAY_SIZE(commands); i++) {
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do {
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memset(sccb, 0, sizeof(*sccb));
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sccb->header.length = sizeof(*sccb);
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sccb->header.control_mask[2] = 0x80;
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rc = sclp_cmd_sync_early(commands[i], sccb);
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} while (rc == -EBUSY);
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if (rc)
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break;
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if (sccb->header.response_code == 0x10) {
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early_read_info_sccb_valid = 1;
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break;
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}
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if (sccb->header.response_code != 0x1f0)
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break;
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}
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}
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void __init sclp_facilities_detect(void)
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{
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if (!early_read_info_sccb_valid)
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return;
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sclp_facilities = early_read_info_sccb.facilities;
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sclp_fac84 = early_read_info_sccb.fac84;
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}
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unsigned long long __init sclp_memory_detect(void)
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{
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unsigned long long memsize;
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struct read_info_sccb *sccb;
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if (!early_read_info_sccb_valid)
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return 0;
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sccb = &early_read_info_sccb;
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if (sccb->rnsize)
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memsize = sccb->rnsize << 20;
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else
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memsize = sccb->rnsize2 << 20;
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if (sccb->rnmax)
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memsize *= sccb->rnmax;
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else
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memsize *= sccb->rnmax2;
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return memsize;
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}
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/*
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* This function will be called after sclp_memory_detect(), which gets called
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* early from early.c code. Therefore the sccb should have valid contents.
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*/
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void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
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{
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struct read_info_sccb *sccb;
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if (!early_read_info_sccb_valid)
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return;
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sccb = &early_read_info_sccb;
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info->is_valid = 1;
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if (sccb->flags & 0x2)
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info->has_dump = 1;
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memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
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}
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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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static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
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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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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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/* Perform sclp request. */
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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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/* Check response. */
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if (request->status != SCLP_REQ_DONE) {
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printk(KERN_WARNING TAG "sync request failed "
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"(cmd=0x%08x, status=0x%02x)\n", 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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/*
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* CPU configuration related functions.
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*/
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#define SCLP_CMDW_READ_CPU_INFO 0x00010001
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#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
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#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
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struct read_cpu_info_sccb {
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struct sccb_header header;
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u16 nr_configured;
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u16 offset_configured;
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u16 nr_standby;
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u16 offset_standby;
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u8 reserved[4096 - 16];
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} __attribute__((packed, aligned(PAGE_SIZE)));
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static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
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struct read_cpu_info_sccb *sccb)
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{
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char *page = (char *) sccb;
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memset(info, 0, sizeof(*info));
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info->configured = sccb->nr_configured;
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info->standby = sccb->nr_standby;
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info->combined = sccb->nr_configured + sccb->nr_standby;
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info->has_cpu_type = sclp_fac84 & 0x1;
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memcpy(&info->cpu, page + sccb->offset_configured,
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info->combined * sizeof(struct sclp_cpu_entry));
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}
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int sclp_get_cpu_info(struct sclp_cpu_info *info)
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{
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int rc;
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struct read_cpu_info_sccb *sccb;
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if (!SCLP_HAS_CPU_INFO)
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return -EOPNOTSUPP;
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sccb = (void *) 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 = do_sync_request(SCLP_CMDW_READ_CPU_INFO, 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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printk(KERN_WARNING TAG "readcpuinfo failed "
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"(response=0x%04x)\n", 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_cpu_info(info, sccb);
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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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struct cpu_configure_sccb {
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struct sccb_header header;
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} __attribute__((packed, aligned(8)));
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static int do_cpu_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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* This is not going to cross a page boundary since we force
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* kmalloc to have a minimum alignment of 8 bytes on s390.
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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 = do_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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break;
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default:
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printk(KERN_WARNING TAG "configure cpu failed (cmd=0x%08x, "
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"response=0x%04x)\n", 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_cpu_configure(u8 cpu)
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{
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return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
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}
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int sclp_cpu_deconfigure(u8 cpu)
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{
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return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
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}
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/*
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* Channel path configuration related functions.
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*/
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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 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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} __attribute__((packed));
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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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/* Prepare sccb. */
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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 = do_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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printk(KERN_WARNING TAG "configure channel-path failed "
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"(cmd=0x%08x, response=0x%04x)\n", cmd,
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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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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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} __attribute__((packed));
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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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/* Prepare sccb. */
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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 = do_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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printk(KERN_WARNING TAG "read channel-path info failed "
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"(response=0x%04x)\n", 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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