![Carsten Otte](/assets/img/avatar_default.png)
Use the SPP instruction to set a tag on entry to / exit of the virtual machine context. This allows the cpu measurement facility to distinguish the samples from the host and the different guests. Signed-off-by: Carsten Otte <cotte@de.ibm.com>
468 lines
11 KiB
C
468 lines
11 KiB
C
/*
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* arch/s390/kernel/early.c
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*
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* Copyright IBM Corp. 2007, 2009
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* Author(s): Hongjie Yang <hongjie@us.ibm.com>,
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* Heiko Carstens <heiko.carstens@de.ibm.com>
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*/
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#define KMSG_COMPONENT "setup"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/compiler.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/ftrace.h>
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#include <linux/lockdep.h>
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#include <linux/module.h>
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#include <linux/pfn.h>
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#include <linux/uaccess.h>
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#include <linux/kernel.h>
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#include <asm/ebcdic.h>
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#include <asm/ipl.h>
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#include <asm/lowcore.h>
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#include <asm/processor.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/sysinfo.h>
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#include <asm/cpcmd.h>
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#include <asm/sclp.h>
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#include "entry.h"
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/*
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* Create a Kernel NSS if the SAVESYS= parameter is defined
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*/
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#define DEFSYS_CMD_SIZE 128
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#define SAVESYS_CMD_SIZE 32
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char kernel_nss_name[NSS_NAME_SIZE + 1];
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static void __init setup_boot_command_line(void);
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/*
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* Get the TOD clock running.
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*/
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static void __init reset_tod_clock(void)
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{
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u64 time;
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if (store_clock(&time) == 0)
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return;
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/* TOD clock not running. Set the clock to Unix Epoch. */
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if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0)
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disabled_wait(0);
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sched_clock_base_cc = TOD_UNIX_EPOCH;
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S390_lowcore.last_update_clock = sched_clock_base_cc;
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}
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#ifdef CONFIG_SHARED_KERNEL
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int __init savesys_ipl_nss(char *cmd, const int cmdlen);
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asm(
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" .section .init.text,\"ax\",@progbits\n"
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" .align 4\n"
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" .type savesys_ipl_nss, @function\n"
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"savesys_ipl_nss:\n"
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#ifdef CONFIG_64BIT
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" stmg 6,15,48(15)\n"
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" lgr 14,3\n"
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" sam31\n"
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" diag 2,14,0x8\n"
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" sam64\n"
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" lgr 2,14\n"
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" lmg 6,15,48(15)\n"
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#else
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" stm 6,15,24(15)\n"
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" lr 14,3\n"
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" diag 2,14,0x8\n"
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" lr 2,14\n"
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" lm 6,15,24(15)\n"
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#endif
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" br 14\n"
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" .size savesys_ipl_nss, .-savesys_ipl_nss\n"
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" .previous\n");
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static __initdata char upper_command_line[COMMAND_LINE_SIZE];
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static noinline __init void create_kernel_nss(void)
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{
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unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
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#ifdef CONFIG_BLK_DEV_INITRD
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unsigned int sinitrd_pfn, einitrd_pfn;
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#endif
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int response;
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size_t len;
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char *savesys_ptr;
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char defsys_cmd[DEFSYS_CMD_SIZE];
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char savesys_cmd[SAVESYS_CMD_SIZE];
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/* Do nothing if we are not running under VM */
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if (!MACHINE_IS_VM)
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return;
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/* Convert COMMAND_LINE to upper case */
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for (i = 0; i < strlen(boot_command_line); i++)
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upper_command_line[i] = toupper(boot_command_line[i]);
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savesys_ptr = strstr(upper_command_line, "SAVESYS=");
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if (!savesys_ptr)
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return;
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savesys_ptr += 8; /* Point to the beginning of the NSS name */
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for (i = 0; i < NSS_NAME_SIZE; i++) {
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if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
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break;
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kernel_nss_name[i] = savesys_ptr[i];
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}
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stext_pfn = PFN_DOWN(__pa(&_stext));
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eshared_pfn = PFN_DOWN(__pa(&_eshared));
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end_pfn = PFN_UP(__pa(&_end));
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min_size = end_pfn << 2;
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sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
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kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
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eshared_pfn, end_pfn);
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#ifdef CONFIG_BLK_DEV_INITRD
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if (INITRD_START && INITRD_SIZE) {
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sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
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einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
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min_size = einitrd_pfn << 2;
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sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
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sinitrd_pfn, einitrd_pfn);
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}
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#endif
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sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
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defsys_cmd, min_size);
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sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
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kernel_nss_name, kernel_nss_name);
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__cpcmd(defsys_cmd, NULL, 0, &response);
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if (response != 0) {
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pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
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response);
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kernel_nss_name[0] = '\0';
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return;
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}
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len = strlen(savesys_cmd);
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ASCEBC(savesys_cmd, len);
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response = savesys_ipl_nss(savesys_cmd, len);
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/* On success: response is equal to the command size,
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* max SAVESYS_CMD_SIZE
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* On error: response contains the numeric portion of cp error message.
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* for SAVESYS it will be >= 263
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* for missing privilege class, it will be 1
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*/
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if (response > SAVESYS_CMD_SIZE || response == 1) {
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pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
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response);
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kernel_nss_name[0] = '\0';
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return;
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}
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/* re-initialize cputime accounting. */
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sched_clock_base_cc = get_clock();
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S390_lowcore.last_update_clock = sched_clock_base_cc;
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S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
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S390_lowcore.user_timer = 0;
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S390_lowcore.system_timer = 0;
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asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
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/* re-setup boot command line with new ipl vm parms */
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ipl_update_parameters();
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setup_boot_command_line();
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ipl_flags = IPL_NSS_VALID;
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}
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#else /* CONFIG_SHARED_KERNEL */
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static inline void create_kernel_nss(void) { }
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#endif /* CONFIG_SHARED_KERNEL */
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/*
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* Clear bss memory
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*/
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static noinline __init void clear_bss_section(void)
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{
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memset(__bss_start, 0, __bss_stop - __bss_start);
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}
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/*
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* Initialize storage key for kernel pages
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*/
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static noinline __init void init_kernel_storage_key(void)
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{
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unsigned long end_pfn, init_pfn;
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end_pfn = PFN_UP(__pa(&_end));
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for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
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page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
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}
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static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
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static noinline __init void detect_machine_type(void)
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{
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/* Check current-configuration-level */
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if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) {
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S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
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return;
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}
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/* Get virtual-machine cpu information. */
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if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !vmms.count)
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return;
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/* Running under KVM? If not we assume z/VM */
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if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
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S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
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else
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S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
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}
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static __init void early_pgm_check_handler(void)
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{
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unsigned long addr;
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const struct exception_table_entry *fixup;
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addr = S390_lowcore.program_old_psw.addr;
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fixup = search_exception_tables(addr & PSW_ADDR_INSN);
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if (!fixup)
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disabled_wait(0);
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S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE;
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}
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static noinline __init void setup_lowcore_early(void)
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{
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psw_t psw;
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psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
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psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
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S390_lowcore.external_new_psw = psw;
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psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
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S390_lowcore.program_new_psw = psw;
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s390_base_pgm_handler_fn = early_pgm_check_handler;
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}
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static noinline __init void setup_hpage(void)
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{
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#ifndef CONFIG_DEBUG_PAGEALLOC
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unsigned int facilities;
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facilities = stfl();
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if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
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return;
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S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE;
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__ctl_set_bit(0, 23);
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#endif
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}
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static __init void detect_mvpg(void)
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{
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#ifndef CONFIG_64BIT
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int rc;
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asm volatile(
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" la 0,0\n"
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" mvpg %2,%2\n"
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"0: la %0,0\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
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if (!rc)
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S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG;
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#endif
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}
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static __init void detect_ieee(void)
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{
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#ifndef CONFIG_64BIT
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int rc, tmp;
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asm volatile(
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" efpc %1,0\n"
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"0: la %0,0\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
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if (!rc)
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S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE;
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#endif
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}
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static __init void detect_csp(void)
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{
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#ifndef CONFIG_64BIT
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int rc;
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asm volatile(
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" la 0,0\n"
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" la 1,0\n"
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" la 2,4\n"
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" csp 0,2\n"
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"0: la %0,0\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
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if (!rc)
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S390_lowcore.machine_flags |= MACHINE_FLAG_CSP;
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#endif
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}
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static __init void detect_diag9c(void)
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{
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unsigned int cpu_address;
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int rc;
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cpu_address = stap();
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asm volatile(
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" diag %2,0,0x9c\n"
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"0: la %0,0\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
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if (!rc)
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S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
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}
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static __init void detect_diag44(void)
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{
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#ifdef CONFIG_64BIT
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int rc;
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asm volatile(
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" diag 0,0,0x44\n"
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"0: la %0,0\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
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if (!rc)
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S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
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#endif
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}
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static __init void detect_machine_facilities(void)
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{
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#ifdef CONFIG_64BIT
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unsigned int facilities;
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unsigned long long facility_bits;
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facilities = stfl();
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if (facilities & (1 << 28))
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S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
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if (facilities & (1 << 23))
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S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF;
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if (facilities & (1 << 4))
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S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS;
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if ((stfle(&facility_bits, 1) > 0) &&
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(facility_bits & (1ULL << (63 - 40))))
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S390_lowcore.machine_flags |= MACHINE_FLAG_SPP;
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#endif
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}
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static __init void rescue_initrd(void)
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{
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#ifdef CONFIG_BLK_DEV_INITRD
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/*
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* Move the initrd right behind the bss section in case it starts
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* within the bss section. So we don't overwrite it when the bss
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* section gets cleared.
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*/
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if (!INITRD_START || !INITRD_SIZE)
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return;
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if (INITRD_START >= (unsigned long) __bss_stop)
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return;
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memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
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INITRD_START = (unsigned long) __bss_stop;
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#endif
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}
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/* Set up boot command line */
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static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
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{
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char *parm, *delim;
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size_t rc, len;
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len = strlen(boot_command_line);
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delim = boot_command_line + len; /* '\0' character position */
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parm = boot_command_line + len + 1; /* append right after '\0' */
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rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
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if (rc) {
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if (*parm == '=')
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memmove(boot_command_line, parm + 1, rc);
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else
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*delim = ' '; /* replace '\0' with space */
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}
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}
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static void __init setup_boot_command_line(void)
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{
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int i;
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/* convert arch command line to ascii */
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for (i = 0; i < ARCH_COMMAND_LINE_SIZE; i++)
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if (COMMAND_LINE[i] & 0x80)
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break;
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if (i < ARCH_COMMAND_LINE_SIZE)
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EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
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COMMAND_LINE[ARCH_COMMAND_LINE_SIZE-1] = 0;
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/* copy arch command line */
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strlcpy(boot_command_line, strstrip(COMMAND_LINE),
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ARCH_COMMAND_LINE_SIZE);
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/* append IPL PARM data to the boot command line */
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if (MACHINE_IS_VM)
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append_to_cmdline(append_ipl_vmparm);
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append_to_cmdline(append_ipl_scpdata);
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}
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/*
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* Save ipl parameters, clear bss memory, initialize storage keys
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* and create a kernel NSS at startup if the SAVESYS= parm is defined
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*/
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void __init startup_init(void)
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{
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reset_tod_clock();
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ipl_save_parameters();
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rescue_initrd();
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clear_bss_section();
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init_kernel_storage_key();
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lockdep_init();
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lockdep_off();
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sort_main_extable();
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setup_lowcore_early();
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detect_machine_type();
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ipl_update_parameters();
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setup_boot_command_line();
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create_kernel_nss();
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detect_mvpg();
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detect_ieee();
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detect_csp();
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detect_diag9c();
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detect_diag44();
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detect_machine_facilities();
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setup_hpage();
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sclp_facilities_detect();
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detect_memory_layout(memory_chunk);
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#ifdef CONFIG_DYNAMIC_FTRACE
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S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;
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#endif
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lockdep_on();
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}
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