mirror of https://gitee.com/openkylin/linux.git
589 lines
14 KiB
C
589 lines
14 KiB
C
/*
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* File...........: arch/s390/mm/extmem.c
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* Author(s)......: Carsten Otte <cotte@de.ibm.com>
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* Rob M van der Heij <rvdheij@nl.ibm.com>
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* Steven Shultz <shultzss@us.ibm.com>
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* Bugreports.to..: <Linux390@de.ibm.com>
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* (C) IBM Corporation 2002-2004
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/bootmem.h>
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#include <asm/page.h>
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#include <asm/ebcdic.h>
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#include <asm/errno.h>
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#include <asm/extmem.h>
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#include <asm/cpcmd.h>
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#include <linux/ctype.h>
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#define DCSS_DEBUG /* Debug messages on/off */
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#define DCSS_NAME "extmem"
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#ifdef DCSS_DEBUG
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#define PRINT_DEBUG(x...) printk(KERN_DEBUG DCSS_NAME " debug:" x)
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#else
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#define PRINT_DEBUG(x...) do {} while (0)
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#endif
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#define PRINT_INFO(x...) printk(KERN_INFO DCSS_NAME " info:" x)
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#define PRINT_WARN(x...) printk(KERN_WARNING DCSS_NAME " warning:" x)
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#define PRINT_ERR(x...) printk(KERN_ERR DCSS_NAME " error:" x)
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#define DCSS_LOADSHR 0x00
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#define DCSS_LOADNSR 0x04
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#define DCSS_PURGESEG 0x08
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#define DCSS_FINDSEG 0x0c
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#define DCSS_LOADNOLY 0x10
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#define DCSS_SEGEXT 0x18
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#define DCSS_FINDSEGA 0x0c
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struct qrange {
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unsigned int start; // 3byte start address, 1 byte type
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unsigned int end; // 3byte end address, 1 byte reserved
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};
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struct qout64 {
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int segstart;
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int segend;
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int segcnt;
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int segrcnt;
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struct qrange range[6];
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};
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struct qin64 {
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char qopcode;
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char rsrv1[3];
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char qrcode;
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char rsrv2[3];
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char qname[8];
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unsigned int qoutptr;
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short int qoutlen;
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};
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struct dcss_segment {
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struct list_head list;
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char dcss_name[8];
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unsigned long start_addr;
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unsigned long end;
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atomic_t ref_count;
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int do_nonshared;
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unsigned int vm_segtype;
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struct qrange range[6];
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int segcnt;
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};
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static DEFINE_SPINLOCK(dcss_lock);
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static struct list_head dcss_list = LIST_HEAD_INIT(dcss_list);
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static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC",
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"EW/EN-MIXED" };
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extern struct {
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unsigned long addr, size, type;
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} memory_chunk[MEMORY_CHUNKS];
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/*
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* Create the 8 bytes, ebcdic VM segment name from
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* an ascii name.
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*/
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static void inline
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dcss_mkname(char *name, char *dcss_name)
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{
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int i;
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for (i = 0; i < 8; i++) {
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if (name[i] == '\0')
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break;
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dcss_name[i] = toupper(name[i]);
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};
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for (; i < 8; i++)
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dcss_name[i] = ' ';
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ASCEBC(dcss_name, 8);
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}
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/*
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* search all segments in dcss_list, and return the one
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* namend *name. If not found, return NULL.
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*/
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static struct dcss_segment *
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segment_by_name (char *name)
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{
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char dcss_name[9];
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struct list_head *l;
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struct dcss_segment *tmp, *retval = NULL;
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assert_spin_locked(&dcss_lock);
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dcss_mkname (name, dcss_name);
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list_for_each (l, &dcss_list) {
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tmp = list_entry (l, struct dcss_segment, list);
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if (memcmp(tmp->dcss_name, dcss_name, 8) == 0) {
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retval = tmp;
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break;
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}
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}
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return retval;
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}
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/*
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* Perform a function on a dcss segment.
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*/
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static inline int
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dcss_diag (__u8 func, void *parameter,
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unsigned long *ret1, unsigned long *ret2)
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{
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unsigned long rx, ry;
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int rc;
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rx = (unsigned long) parameter;
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ry = (unsigned long) func;
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__asm__ __volatile__(
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#ifdef CONFIG_ARCH_S390X
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" sam31\n" // switch to 31 bit
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" diag %0,%1,0x64\n"
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" sam64\n" // switch back to 64 bit
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#else
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" diag %0,%1,0x64\n"
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#endif
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" ipm %2\n"
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" srl %2,28\n"
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: "+d" (rx), "+d" (ry), "=d" (rc) : : "cc" );
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*ret1 = rx;
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*ret2 = ry;
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return rc;
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}
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static inline int
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dcss_diag_translate_rc (int vm_rc) {
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if (vm_rc == 44)
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return -ENOENT;
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return -EIO;
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}
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/* do a diag to get info about a segment.
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* fills start_address, end and vm_segtype fields
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*/
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static int
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query_segment_type (struct dcss_segment *seg)
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{
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struct qin64 *qin = kmalloc (sizeof(struct qin64), GFP_DMA);
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struct qout64 *qout = kmalloc (sizeof(struct qout64), GFP_DMA);
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int diag_cc, rc, i;
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unsigned long dummy, vmrc;
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if ((qin == NULL) || (qout == NULL)) {
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rc = -ENOMEM;
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goto out_free;
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}
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/* initialize diag input parameters */
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qin->qopcode = DCSS_FINDSEGA;
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qin->qoutptr = (unsigned long) qout;
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qin->qoutlen = sizeof(struct qout64);
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memcpy (qin->qname, seg->dcss_name, 8);
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diag_cc = dcss_diag (DCSS_SEGEXT, qin, &dummy, &vmrc);
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if (diag_cc > 1) {
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rc = dcss_diag_translate_rc (vmrc);
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goto out_free;
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}
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if (qout->segcnt > 6) {
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rc = -ENOTSUPP;
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goto out_free;
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}
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if (qout->segcnt == 1) {
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seg->vm_segtype = qout->range[0].start & 0xff;
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} else {
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/* multi-part segment. only one type supported here:
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- all parts are contiguous
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- all parts are either EW or EN type
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- maximum 6 parts allowed */
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unsigned long start = qout->segstart >> PAGE_SHIFT;
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for (i=0; i<qout->segcnt; i++) {
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if (((qout->range[i].start & 0xff) != SEG_TYPE_EW) &&
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((qout->range[i].start & 0xff) != SEG_TYPE_EN)) {
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rc = -ENOTSUPP;
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goto out_free;
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}
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if (start != qout->range[i].start >> PAGE_SHIFT) {
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rc = -ENOTSUPP;
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goto out_free;
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}
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start = (qout->range[i].end >> PAGE_SHIFT) + 1;
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}
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seg->vm_segtype = SEG_TYPE_EWEN;
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}
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/* analyze diag output and update seg */
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seg->start_addr = qout->segstart;
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seg->end = qout->segend;
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memcpy (seg->range, qout->range, 6*sizeof(struct qrange));
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seg->segcnt = qout->segcnt;
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rc = 0;
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out_free:
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if (qin) kfree(qin);
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if (qout) kfree(qout);
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return rc;
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}
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/*
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* check if the given segment collides with guest storage.
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* returns 1 if this is the case, 0 if no collision was found
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*/
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static int
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segment_overlaps_storage(struct dcss_segment *seg)
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{
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int i;
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for (i=0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
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if (memory_chunk[i].type != 0)
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continue;
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if ((memory_chunk[i].addr >> 20) > (seg->end >> 20))
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continue;
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if (((memory_chunk[i].addr + memory_chunk[i].size - 1) >> 20)
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< (seg->start_addr >> 20))
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continue;
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return 1;
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}
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return 0;
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}
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/*
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* check if segment collides with other segments that are currently loaded
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* returns 1 if this is the case, 0 if no collision was found
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*/
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static int
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segment_overlaps_others (struct dcss_segment *seg)
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{
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struct list_head *l;
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struct dcss_segment *tmp;
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assert_spin_locked(&dcss_lock);
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list_for_each(l, &dcss_list) {
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tmp = list_entry(l, struct dcss_segment, list);
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if ((tmp->start_addr >> 20) > (seg->end >> 20))
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continue;
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if ((tmp->end >> 20) < (seg->start_addr >> 20))
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continue;
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if (seg == tmp)
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continue;
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return 1;
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}
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return 0;
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}
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/*
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* check if segment exceeds the kernel mapping range (detected or set via mem=)
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* returns 1 if this is the case, 0 if segment fits into the range
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*/
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static inline int
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segment_exceeds_range (struct dcss_segment *seg)
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{
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int seg_last_pfn = (seg->end) >> PAGE_SHIFT;
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if (seg_last_pfn > max_pfn)
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return 1;
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return 0;
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}
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/*
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* get info about a segment
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* possible return values:
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* -ENOSYS : we are not running on VM
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* -EIO : could not perform query diagnose
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* -ENOENT : no such segment
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* -ENOTSUPP: multi-part segment cannot be used with linux
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* -ENOSPC : segment cannot be used (overlaps with storage)
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* -ENOMEM : out of memory
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* 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
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*/
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int
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segment_type (char* name)
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{
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int rc;
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struct dcss_segment seg;
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if (!MACHINE_IS_VM)
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return -ENOSYS;
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dcss_mkname(name, seg.dcss_name);
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rc = query_segment_type (&seg);
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if (rc < 0)
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return rc;
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return seg.vm_segtype;
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}
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/*
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* real segment loading function, called from segment_load
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*/
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static int
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__segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end)
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{
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struct dcss_segment *seg = kmalloc(sizeof(struct dcss_segment),
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GFP_DMA);
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int dcss_command, rc, diag_cc;
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if (seg == NULL) {
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rc = -ENOMEM;
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goto out;
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}
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dcss_mkname (name, seg->dcss_name);
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rc = query_segment_type (seg);
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if (rc < 0)
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goto out_free;
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if (segment_exceeds_range(seg)) {
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PRINT_WARN ("segment_load: not loading segment %s - exceeds"
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" kernel mapping range\n",name);
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rc = -ERANGE;
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goto out_free;
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}
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if (segment_overlaps_storage(seg)) {
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PRINT_WARN ("segment_load: not loading segment %s - overlaps"
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" storage\n",name);
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rc = -ENOSPC;
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goto out_free;
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}
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if (segment_overlaps_others(seg)) {
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PRINT_WARN ("segment_load: not loading segment %s - overlaps"
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" other segments\n",name);
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rc = -EBUSY;
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goto out_free;
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}
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if (do_nonshared)
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dcss_command = DCSS_LOADNSR;
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else
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dcss_command = DCSS_LOADNOLY;
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diag_cc = dcss_diag(dcss_command, seg->dcss_name,
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&seg->start_addr, &seg->end);
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if (diag_cc > 1) {
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PRINT_WARN ("segment_load: could not load segment %s - "
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"diag returned error (%ld)\n",name,seg->end);
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rc = dcss_diag_translate_rc (seg->end);
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dcss_diag(DCSS_PURGESEG, seg->dcss_name,
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&seg->start_addr, &seg->end);
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goto out_free;
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}
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seg->do_nonshared = do_nonshared;
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atomic_set(&seg->ref_count, 1);
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list_add(&seg->list, &dcss_list);
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rc = seg->vm_segtype;
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*addr = seg->start_addr;
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*end = seg->end;
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if (do_nonshared)
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PRINT_INFO ("segment_load: loaded segment %s range %p .. %p "
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"type %s in non-shared mode\n", name,
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(void*)seg->start_addr, (void*)seg->end,
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segtype_string[seg->vm_segtype]);
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else
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PRINT_INFO ("segment_load: loaded segment %s range %p .. %p "
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"type %s in shared mode\n", name,
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(void*)seg->start_addr, (void*)seg->end,
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segtype_string[seg->vm_segtype]);
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goto out;
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out_free:
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kfree (seg);
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out:
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return rc;
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}
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/*
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* this function loads a DCSS segment
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* name : name of the DCSS
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* do_nonshared : 0 indicates that the dcss should be shared with other linux images
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* 1 indicates that the dcss should be exclusive for this linux image
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* addr : will be filled with start address of the segment
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* end : will be filled with end address of the segment
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* return values:
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* -ENOSYS : we are not running on VM
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* -EIO : could not perform query or load diagnose
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* -ENOENT : no such segment
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* -ENOTSUPP: multi-part segment cannot be used with linux
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* -ENOSPC : segment cannot be used (overlaps with storage)
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* -EBUSY : segment can temporarily not be used (overlaps with dcss)
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* -ERANGE : segment cannot be used (exceeds kernel mapping range)
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* -EPERM : segment is currently loaded with incompatible permissions
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* -ENOMEM : out of memory
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* 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
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*/
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int
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segment_load (char *name, int do_nonshared, unsigned long *addr,
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unsigned long *end)
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{
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struct dcss_segment *seg;
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int rc;
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if (!MACHINE_IS_VM)
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return -ENOSYS;
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spin_lock (&dcss_lock);
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seg = segment_by_name (name);
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if (seg == NULL)
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rc = __segment_load (name, do_nonshared, addr, end);
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else {
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if (do_nonshared == seg->do_nonshared) {
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atomic_inc(&seg->ref_count);
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*addr = seg->start_addr;
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*end = seg->end;
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rc = seg->vm_segtype;
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} else {
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*addr = *end = 0;
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rc = -EPERM;
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}
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}
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spin_unlock (&dcss_lock);
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return rc;
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}
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/*
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* this function modifies the shared state of a DCSS segment. note that
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* name : name of the DCSS
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* do_nonshared : 0 indicates that the dcss should be shared with other linux images
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* 1 indicates that the dcss should be exclusive for this linux image
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* return values:
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* -EIO : could not perform load diagnose (segment gone!)
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* -ENOENT : no such segment (segment gone!)
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* -EAGAIN : segment is in use by other exploiters, try later
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* -EINVAL : no segment with the given name is currently loaded - name invalid
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* 0 : operation succeeded
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*/
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int
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segment_modify_shared (char *name, int do_nonshared)
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{
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struct dcss_segment *seg;
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unsigned long dummy;
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int dcss_command, rc, diag_cc;
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spin_lock (&dcss_lock);
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seg = segment_by_name (name);
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if (seg == NULL) {
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rc = -EINVAL;
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goto out_unlock;
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}
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if (do_nonshared == seg->do_nonshared) {
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PRINT_INFO ("segment_modify_shared: not reloading segment %s"
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" - already in requested mode\n",name);
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rc = 0;
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goto out_unlock;
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}
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if (atomic_read (&seg->ref_count) != 1) {
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PRINT_WARN ("segment_modify_shared: not reloading segment %s - "
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"segment is in use by other driver(s)\n",name);
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rc = -EAGAIN;
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goto out_unlock;
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}
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dcss_diag(DCSS_PURGESEG, seg->dcss_name,
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&dummy, &dummy);
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if (do_nonshared)
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dcss_command = DCSS_LOADNSR;
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else
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dcss_command = DCSS_LOADNOLY;
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diag_cc = dcss_diag(dcss_command, seg->dcss_name,
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&seg->start_addr, &seg->end);
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if (diag_cc > 1) {
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PRINT_WARN ("segment_modify_shared: could not reload segment %s"
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" - diag returned error (%ld)\n",name,seg->end);
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rc = dcss_diag_translate_rc (seg->end);
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goto out_del;
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}
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seg->do_nonshared = do_nonshared;
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rc = 0;
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goto out_unlock;
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out_del:
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list_del(&seg->list);
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dcss_diag(DCSS_PURGESEG, seg->dcss_name,
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&dummy, &dummy);
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kfree (seg);
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out_unlock:
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spin_unlock(&dcss_lock);
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return rc;
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}
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/*
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* Decrease the use count of a DCSS segment and remove
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* it from the address space if nobody is using it
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* any longer.
|
|
*/
|
|
void
|
|
segment_unload(char *name)
|
|
{
|
|
unsigned long dummy;
|
|
struct dcss_segment *seg;
|
|
|
|
if (!MACHINE_IS_VM)
|
|
return;
|
|
|
|
spin_lock(&dcss_lock);
|
|
seg = segment_by_name (name);
|
|
if (seg == NULL) {
|
|
PRINT_ERR ("could not find segment %s in segment_unload, "
|
|
"please report to linux390@de.ibm.com\n",name);
|
|
goto out_unlock;
|
|
}
|
|
if (atomic_dec_return(&seg->ref_count) == 0) {
|
|
list_del(&seg->list);
|
|
dcss_diag(DCSS_PURGESEG, seg->dcss_name,
|
|
&dummy, &dummy);
|
|
kfree(seg);
|
|
}
|
|
out_unlock:
|
|
spin_unlock(&dcss_lock);
|
|
}
|
|
|
|
/*
|
|
* save segment content permanently
|
|
*/
|
|
void
|
|
segment_save(char *name)
|
|
{
|
|
struct dcss_segment *seg;
|
|
int startpfn = 0;
|
|
int endpfn = 0;
|
|
char cmd1[160];
|
|
char cmd2[80];
|
|
int i;
|
|
|
|
if (!MACHINE_IS_VM)
|
|
return;
|
|
|
|
spin_lock(&dcss_lock);
|
|
seg = segment_by_name (name);
|
|
|
|
if (seg == NULL) {
|
|
PRINT_ERR ("could not find segment %s in segment_save, please report to linux390@de.ibm.com\n",name);
|
|
return;
|
|
}
|
|
|
|
startpfn = seg->start_addr >> PAGE_SHIFT;
|
|
endpfn = (seg->end) >> PAGE_SHIFT;
|
|
sprintf(cmd1, "DEFSEG %s", name);
|
|
for (i=0; i<seg->segcnt; i++) {
|
|
sprintf(cmd1+strlen(cmd1), " %X-%X %s",
|
|
seg->range[i].start >> PAGE_SHIFT,
|
|
seg->range[i].end >> PAGE_SHIFT,
|
|
segtype_string[seg->range[i].start & 0xff]);
|
|
}
|
|
sprintf(cmd2, "SAVESEG %s", name);
|
|
cpcmd(cmd1, NULL, 0, NULL);
|
|
cpcmd(cmd2, NULL, 0, NULL);
|
|
spin_unlock(&dcss_lock);
|
|
}
|
|
|
|
EXPORT_SYMBOL(segment_load);
|
|
EXPORT_SYMBOL(segment_unload);
|
|
EXPORT_SYMBOL(segment_save);
|
|
EXPORT_SYMBOL(segment_type);
|
|
EXPORT_SYMBOL(segment_modify_shared);
|