665 lines
15 KiB
C
665 lines
15 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): 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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#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/init.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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#include <linux/memory.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <asm/ctl_reg.h>
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#include <asm/chpid.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/sclp.h>
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#include <asm/numa.h>
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#include "sclp.h"
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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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/* 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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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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/*
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* CPU configuration related functions.
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*/
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#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
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#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
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int _sclp_get_core_info(struct sclp_core_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 = 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_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_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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* 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 = 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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#ifdef CONFIG_MEMORY_HOTPLUG
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static DEFINE_MUTEX(sclp_mem_mutex);
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static LIST_HEAD(sclp_mem_list);
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static u8 sclp_max_storage_id;
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static DECLARE_BITMAP(sclp_storage_ids, 256);
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static int sclp_mem_state_changed;
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struct memory_increment {
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struct list_head list;
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u16 rn;
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int standby;
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};
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struct assign_storage_sccb {
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struct sccb_header header;
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u16 rn;
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} __packed;
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int arch_get_memory_phys_device(unsigned long start_pfn)
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{
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if (!sclp.rzm)
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return 0;
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return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
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}
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static unsigned long long rn2addr(u16 rn)
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{
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return (unsigned long long) (rn - 1) * sclp.rzm;
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}
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static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
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{
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struct assign_storage_sccb *sccb;
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int rc;
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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 = PAGE_SIZE;
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sccb->rn = rn;
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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("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
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cmd, sccb->header.response_code, rn);
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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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static int sclp_assign_storage(u16 rn)
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{
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unsigned long long start;
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int rc;
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rc = do_assign_storage(0x000d0001, rn);
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if (rc)
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return rc;
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start = rn2addr(rn);
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storage_key_init_range(start, start + sclp.rzm);
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return 0;
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}
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static int sclp_unassign_storage(u16 rn)
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{
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return do_assign_storage(0x000c0001, rn);
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}
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struct attach_storage_sccb {
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struct sccb_header header;
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u16 :16;
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u16 assigned;
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u32 :32;
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u32 entries[0];
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} __packed;
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static int sclp_attach_storage(u8 id)
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{
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struct attach_storage_sccb *sccb;
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int rc;
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int i;
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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 = PAGE_SIZE;
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sccb->header.function_code = 0x40;
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rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
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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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set_bit(id, sclp_storage_ids);
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for (i = 0; i < sccb->assigned; i++) {
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if (sccb->entries[i])
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sclp_unassign_storage(sccb->entries[i] >> 16);
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}
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break;
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default:
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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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static int sclp_mem_change_state(unsigned long start, unsigned long size,
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int online)
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{
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struct memory_increment *incr;
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unsigned long long istart;
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int rc = 0;
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list_for_each_entry(incr, &sclp_mem_list, list) {
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istart = rn2addr(incr->rn);
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if (start + size - 1 < istart)
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break;
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if (start > istart + sclp.rzm - 1)
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continue;
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if (online)
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rc |= sclp_assign_storage(incr->rn);
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else
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sclp_unassign_storage(incr->rn);
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if (rc == 0)
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incr->standby = online ? 0 : 1;
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}
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return rc ? -EIO : 0;
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}
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static bool contains_standby_increment(unsigned long start, unsigned long end)
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{
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struct memory_increment *incr;
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unsigned long istart;
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list_for_each_entry(incr, &sclp_mem_list, list) {
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istart = rn2addr(incr->rn);
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if (end - 1 < istart)
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continue;
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if (start > istart + sclp.rzm - 1)
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continue;
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if (incr->standby)
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return true;
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}
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return false;
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}
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static int sclp_mem_notifier(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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unsigned long start, size;
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struct memory_notify *arg;
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unsigned char id;
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int rc = 0;
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arg = data;
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start = arg->start_pfn << PAGE_SHIFT;
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size = arg->nr_pages << PAGE_SHIFT;
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mutex_lock(&sclp_mem_mutex);
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for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
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sclp_attach_storage(id);
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switch (action) {
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case MEM_GOING_OFFLINE:
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/*
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* We do not allow to set memory blocks offline that contain
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* standby memory. This is done to simplify the "memory online"
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* case.
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*/
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if (contains_standby_increment(start, start + size))
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rc = -EPERM;
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break;
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case MEM_ONLINE:
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case MEM_CANCEL_OFFLINE:
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break;
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case MEM_GOING_ONLINE:
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rc = sclp_mem_change_state(start, size, 1);
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break;
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case MEM_CANCEL_ONLINE:
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sclp_mem_change_state(start, size, 0);
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break;
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case MEM_OFFLINE:
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sclp_mem_change_state(start, size, 0);
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break;
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default:
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rc = -EINVAL;
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break;
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}
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if (!rc)
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sclp_mem_state_changed = 1;
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mutex_unlock(&sclp_mem_mutex);
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return rc ? NOTIFY_BAD : NOTIFY_OK;
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}
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static struct notifier_block sclp_mem_nb = {
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.notifier_call = sclp_mem_notifier,
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};
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static void __init align_to_block_size(unsigned long long *start,
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unsigned long long *size,
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unsigned long long alignment)
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{
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unsigned long long start_align, size_align;
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start_align = roundup(*start, alignment);
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size_align = rounddown(*start + *size, alignment) - start_align;
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pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
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*start, size_align >> 20, *size >> 20);
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*start = start_align;
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*size = size_align;
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}
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static void __init add_memory_merged(u16 rn)
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{
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unsigned long long start, size, addr, block_size;
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static u16 first_rn, num;
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if (rn && first_rn && (first_rn + num == rn)) {
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num++;
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return;
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}
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if (!first_rn)
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goto skip_add;
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start = rn2addr(first_rn);
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size = (unsigned long long) num * sclp.rzm;
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if (start >= VMEM_MAX_PHYS)
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goto skip_add;
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if (start + size > VMEM_MAX_PHYS)
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size = VMEM_MAX_PHYS - start;
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if (memory_end_set && (start >= memory_end))
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goto skip_add;
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if (memory_end_set && (start + size > memory_end))
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size = memory_end - start;
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block_size = memory_block_size_bytes();
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align_to_block_size(&start, &size, block_size);
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if (!size)
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goto skip_add;
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for (addr = start; addr < start + size; addr += block_size)
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add_memory(numa_pfn_to_nid(PFN_DOWN(addr)), addr, block_size);
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skip_add:
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first_rn = rn;
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num = 1;
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}
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static void __init sclp_add_standby_memory(void)
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{
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struct memory_increment *incr;
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list_for_each_entry(incr, &sclp_mem_list, list)
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if (incr->standby)
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add_memory_merged(incr->rn);
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add_memory_merged(0);
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}
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static void __init insert_increment(u16 rn, int standby, int assigned)
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{
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struct memory_increment *incr, *new_incr;
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struct list_head *prev;
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u16 last_rn;
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new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
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if (!new_incr)
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return;
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new_incr->rn = rn;
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new_incr->standby = standby;
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last_rn = 0;
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prev = &sclp_mem_list;
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list_for_each_entry(incr, &sclp_mem_list, list) {
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if (assigned && incr->rn > rn)
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break;
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if (!assigned && incr->rn - last_rn > 1)
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break;
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last_rn = incr->rn;
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prev = &incr->list;
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}
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if (!assigned)
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new_incr->rn = last_rn + 1;
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if (new_incr->rn > sclp.rnmax) {
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kfree(new_incr);
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return;
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}
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list_add(&new_incr->list, prev);
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}
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static int sclp_mem_freeze(struct device *dev)
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{
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if (!sclp_mem_state_changed)
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return 0;
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pr_err("Memory hotplug state changed, suspend refused.\n");
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return -EPERM;
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}
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static const struct dev_pm_ops sclp_mem_pm_ops = {
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.freeze = sclp_mem_freeze,
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};
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static struct platform_driver sclp_mem_pdrv = {
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.driver = {
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.name = "sclp_mem",
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.pm = &sclp_mem_pm_ops,
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},
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};
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static int __init sclp_detect_standby_memory(void)
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{
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struct platform_device *sclp_pdev;
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struct read_storage_sccb *sccb;
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int i, id, assigned, rc;
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if (OLDMEM_BASE) /* No standby memory in kdump mode */
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return 0;
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if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
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return 0;
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rc = -ENOMEM;
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sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
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if (!sccb)
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goto out;
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assigned = 0;
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for (id = 0; id <= sclp_max_storage_id; id++) {
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memset(sccb, 0, PAGE_SIZE);
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sccb->header.length = PAGE_SIZE;
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rc = sclp_sync_request(SCLP_CMDW_READ_STORAGE_INFO | id << 8, 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 0x0010:
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set_bit(id, sclp_storage_ids);
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for (i = 0; i < sccb->assigned; i++) {
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if (!sccb->entries[i])
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continue;
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assigned++;
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insert_increment(sccb->entries[i] >> 16, 0, 1);
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}
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break;
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case 0x0310:
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break;
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case 0x0410:
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for (i = 0; i < sccb->assigned; i++) {
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if (!sccb->entries[i])
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continue;
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assigned++;
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insert_increment(sccb->entries[i] >> 16, 1, 1);
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}
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break;
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default:
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rc = -EIO;
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break;
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}
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if (!rc)
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sclp_max_storage_id = sccb->max_id;
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}
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if (rc || list_empty(&sclp_mem_list))
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goto out;
|
|
for (i = 1; i <= sclp.rnmax - assigned; i++)
|
|
insert_increment(0, 1, 0);
|
|
rc = register_memory_notifier(&sclp_mem_nb);
|
|
if (rc)
|
|
goto out;
|
|
rc = platform_driver_register(&sclp_mem_pdrv);
|
|
if (rc)
|
|
goto out;
|
|
sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
|
|
rc = PTR_ERR_OR_ZERO(sclp_pdev);
|
|
if (rc)
|
|
goto out_driver;
|
|
sclp_add_standby_memory();
|
|
goto out;
|
|
out_driver:
|
|
platform_driver_unregister(&sclp_mem_pdrv);
|
|
out:
|
|
free_page((unsigned long) sccb);
|
|
return rc;
|
|
}
|
|
__initcall(sclp_detect_standby_memory);
|
|
|
|
#endif /* CONFIG_MEMORY_HOTPLUG */
|
|
|
|
/*
|
|
* Channel path configuration related functions.
|
|
*/
|
|
|
|
#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
|
|
#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
|
|
#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
|
|
|
|
struct chp_cfg_sccb {
|
|
struct sccb_header header;
|
|
u8 ccm;
|
|
u8 reserved[6];
|
|
u8 cssid;
|
|
} __attribute__((packed));
|
|
|
|
static int do_chp_configure(sclp_cmdw_t cmd)
|
|
{
|
|
struct chp_cfg_sccb *sccb;
|
|
int rc;
|
|
|
|
if (!SCLP_HAS_CHP_RECONFIG)
|
|
return -EOPNOTSUPP;
|
|
/* Prepare sccb. */
|
|
sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
|
|
if (!sccb)
|
|
return -ENOMEM;
|
|
sccb->header.length = sizeof(*sccb);
|
|
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 channel-path failed (cmd=0x%08x, response=0x%04x)\n",
|
|
cmd, sccb->header.response_code);
|
|
rc = -EIO;
|
|
break;
|
|
}
|
|
out:
|
|
free_page((unsigned long) sccb);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* sclp_chp_configure - perform configure channel-path sclp command
|
|
* @chpid: channel-path ID
|
|
*
|
|
* Perform configure channel-path command sclp command for specified chpid.
|
|
* Return 0 after command successfully finished, non-zero otherwise.
|
|
*/
|
|
int sclp_chp_configure(struct chp_id chpid)
|
|
{
|
|
return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
|
|
}
|
|
|
|
/**
|
|
* sclp_chp_deconfigure - perform deconfigure channel-path sclp command
|
|
* @chpid: channel-path ID
|
|
*
|
|
* Perform deconfigure channel-path command sclp command for specified chpid
|
|
* and wait for completion. On success return 0. Return non-zero otherwise.
|
|
*/
|
|
int sclp_chp_deconfigure(struct chp_id chpid)
|
|
{
|
|
return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
|
|
}
|
|
|
|
struct chp_info_sccb {
|
|
struct sccb_header header;
|
|
u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
|
|
u8 standby[SCLP_CHP_INFO_MASK_SIZE];
|
|
u8 configured[SCLP_CHP_INFO_MASK_SIZE];
|
|
u8 ccm;
|
|
u8 reserved[6];
|
|
u8 cssid;
|
|
} __attribute__((packed));
|
|
|
|
/**
|
|
* sclp_chp_read_info - perform read channel-path information sclp command
|
|
* @info: resulting channel-path information data
|
|
*
|
|
* Perform read channel-path information sclp command and wait for completion.
|
|
* On success, store channel-path information in @info and return 0. Return
|
|
* non-zero otherwise.
|
|
*/
|
|
int sclp_chp_read_info(struct sclp_chp_info *info)
|
|
{
|
|
struct chp_info_sccb *sccb;
|
|
int rc;
|
|
|
|
if (!SCLP_HAS_CHP_INFO)
|
|
return -EOPNOTSUPP;
|
|
/* Prepare sccb. */
|
|
sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
|
|
if (!sccb)
|
|
return -ENOMEM;
|
|
sccb->header.length = sizeof(*sccb);
|
|
rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
|
|
if (rc)
|
|
goto out;
|
|
if (sccb->header.response_code != 0x0010) {
|
|
pr_warn("read channel-path info failed (response=0x%04x)\n",
|
|
sccb->header.response_code);
|
|
rc = -EIO;
|
|
goto out;
|
|
}
|
|
memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
|
|
memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
|
|
memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
|
|
out:
|
|
free_page((unsigned long) sccb);
|
|
return rc;
|
|
}
|