2005-04-16 22:20:36 +00:00
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/*
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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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2012-07-20 09:15:04 +00:00
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* Copyright IBM Corp. 2002, 2004
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2005-04-16 22:20:36 +00:00
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*/
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2008-12-25 12:39:45 +00:00
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#define KMSG_COMPONENT "extmem"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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2005-04-16 22:20:36 +00:00
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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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2017-02-09 20:20:24 +00:00
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#include <linux/export.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/bootmem.h>
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2006-12-04 14:40:38 +00:00
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#include <linux/ctype.h>
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2007-02-05 20:17:11 +00:00
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#include <linux/ioport.h>
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2015-08-20 15:28:44 +00:00
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#include <asm/diag.h>
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2005-04-16 22:20:36 +00:00
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#include <asm/page.h>
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2006-12-08 14:56:07 +00:00
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#include <asm/pgtable.h>
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2005-04-16 22:20:36 +00:00
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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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2006-12-04 14:40:38 +00:00
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#include <asm/setup.h>
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2005-04-16 22:20:36 +00:00
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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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2008-10-10 19:33:21 +00:00
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#define DCSS_LOADSHRX 0x20
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#define DCSS_LOADNSRX 0x24
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#define DCSS_FINDSEGX 0x2c
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#define DCSS_SEGEXTX 0x38
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2005-04-16 22:20:36 +00:00
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#define DCSS_FINDSEGA 0x0c
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struct qrange {
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2008-10-10 19:33:21 +00:00
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unsigned long start; /* last byte type */
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unsigned long end; /* last byte reserved */
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2005-04-16 22:20:36 +00:00
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};
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struct qout64 {
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2008-10-10 19:33:21 +00:00
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unsigned long segstart;
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unsigned long 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 qrange_old {
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unsigned int start; /* last byte type */
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unsigned int end; /* last byte reserved */
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};
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/* output area format for the Diag x'64' old subcode x'18' */
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struct qout64_old {
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2005-04-16 22:20:36 +00:00
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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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2008-10-10 19:33:21 +00:00
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struct qrange_old range[6];
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2005-04-16 22:20:36 +00:00
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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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2007-02-05 20:17:11 +00:00
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char res_name[15];
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2005-04-16 22:20:36 +00:00
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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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2007-02-05 20:17:11 +00:00
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struct resource *res;
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2005-04-16 22:20:36 +00:00
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};
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2006-12-04 14:40:51 +00:00
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static DEFINE_MUTEX(dcss_lock);
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2008-01-26 13:11:13 +00:00
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static LIST_HEAD(dcss_list);
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2005-04-16 22:20:36 +00:00
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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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2015-12-07 11:52:20 +00:00
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static int loadshr_scode, loadnsr_scode;
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2008-10-10 19:33:21 +00:00
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static int segext_scode, purgeseg_scode;
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static int scode_set;
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/* set correct Diag x'64' subcodes. */
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static int
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dcss_set_subcodes(void)
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{
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2010-06-08 16:58:09 +00:00
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char *name = kmalloc(8 * sizeof(char), GFP_KERNEL | GFP_DMA);
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2008-10-10 19:33:21 +00:00
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unsigned long rx, ry;
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int rc;
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if (name == NULL)
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return -ENOMEM;
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rx = (unsigned long) name;
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ry = DCSS_FINDSEGX;
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strcpy(name, "dummy");
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2015-08-20 15:28:44 +00:00
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diag_stat_inc(DIAG_STAT_X064);
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2008-10-10 19:33:21 +00:00
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asm volatile(
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" diag %0,%1,0x64\n"
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"0: ipm %2\n"
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" srl %2,28\n"
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" j 2f\n"
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"1: la %2,3\n"
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"2:\n"
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EX_TABLE(0b, 1b)
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2016-12-13 11:51:19 +00:00
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: "+d" (rx), "+d" (ry), "=d" (rc) : : "cc", "memory");
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2008-10-10 19:33:21 +00:00
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kfree(name);
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/* Diag x'64' new subcodes are supported, set to new subcodes */
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if (rc != 3) {
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loadshr_scode = DCSS_LOADSHRX;
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loadnsr_scode = DCSS_LOADNSRX;
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purgeseg_scode = DCSS_PURGESEG;
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segext_scode = DCSS_SEGEXTX;
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return 0;
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}
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/* Diag x'64' new subcodes are not supported, set to old subcodes */
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loadshr_scode = DCSS_LOADNOLY;
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loadnsr_scode = DCSS_LOADNSR;
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purgeseg_scode = DCSS_PURGESEG;
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segext_scode = DCSS_SEGEXT;
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return 0;
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}
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2005-04-16 22:20:36 +00:00
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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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2007-02-05 20:18:53 +00:00
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static void
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2005-04-16 22:20:36 +00:00
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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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2017-01-02 07:51:02 +00:00
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}
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2005-04-16 22:20:36 +00:00
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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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2006-12-04 14:40:51 +00:00
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BUG_ON(!mutex_is_locked(&dcss_lock));
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2005-04-16 22:20:36 +00:00
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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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2008-10-10 19:33:21 +00:00
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dcss_diag(int *func, void *parameter,
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2005-04-16 22:20:36 +00:00
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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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2008-10-10 19:33:21 +00:00
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if (scode_set == 0) {
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rc = dcss_set_subcodes();
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if (rc < 0)
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return rc;
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scode_set = 1;
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}
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2005-04-16 22:20:36 +00:00
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rx = (unsigned long) parameter;
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2008-10-10 19:33:21 +00:00
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ry = (unsigned long) *func;
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/* 64-bit Diag x'64' new subcode, keep in 64-bit addressing mode */
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2015-08-20 15:28:44 +00:00
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diag_stat_inc(DIAG_STAT_X064);
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2008-10-10 19:33:21 +00:00
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if (*func > DCSS_SEGEXT)
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asm volatile(
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" diag %0,%1,0x64\n"
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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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/* 31-bit Diag x'64' old subcode, switch to 31-bit addressing mode */
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else
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asm volatile(
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" sam31\n"
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" diag %0,%1,0x64\n"
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" sam64\n"
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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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2005-04-16 22:20:36 +00:00
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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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unsigned long dummy, vmrc;
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2010-06-08 16:58:09 +00:00
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int diag_cc, rc, i;
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struct qout64 *qout;
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struct qin64 *qin;
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2005-04-16 22:20:36 +00:00
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2010-06-08 16:58:09 +00:00
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qin = kmalloc(sizeof(*qin), GFP_KERNEL | GFP_DMA);
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qout = kmalloc(sizeof(*qout), GFP_KERNEL | GFP_DMA);
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2005-04-16 22:20:36 +00:00
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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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2008-10-10 19:33:21 +00:00
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diag_cc = dcss_diag(&segext_scode, qin, &dummy, &vmrc);
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2005-04-16 22:20:36 +00:00
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2008-10-10 19:33:21 +00:00
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if (diag_cc < 0) {
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rc = diag_cc;
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goto out_free;
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}
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2005-04-16 22:20:36 +00:00
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if (diag_cc > 1) {
|
2016-03-04 04:49:57 +00:00
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pr_warn("Querying a DCSS type failed with rc=%ld\n", vmrc);
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2005-04-16 22:20:36 +00:00
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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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2008-10-10 19:33:21 +00:00
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/* Only old format of output area of Diagnose x'64' is supported,
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copy data for the new format. */
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if (segext_scode == DCSS_SEGEXT) {
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struct qout64_old *qout_old;
|
2010-06-08 16:58:09 +00:00
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qout_old = kzalloc(sizeof(*qout_old), GFP_KERNEL | GFP_DMA);
|
2008-10-10 19:33:21 +00:00
|
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if (qout_old == NULL) {
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rc = -ENOMEM;
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goto out_free;
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}
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memcpy(qout_old, qout, sizeof(struct qout64_old));
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qout->segstart = (unsigned long) qout_old->segstart;
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qout->segend = (unsigned long) qout_old->segend;
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qout->segcnt = qout_old->segcnt;
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qout->segrcnt = qout_old->segrcnt;
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if (qout->segcnt > 6)
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qout->segrcnt = 6;
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for (i = 0; i < qout->segrcnt; i++) {
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qout->range[i].start =
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(unsigned long) qout_old->range[i].start;
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qout->range[i].end =
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(unsigned long) qout_old->range[i].end;
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}
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kfree(qout_old);
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}
|
2005-04-16 22:20:36 +00:00
|
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if (qout->segcnt > 6) {
|
2010-02-26 21:37:41 +00:00
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rc = -EOPNOTSUPP;
|
2005-04-16 22:20:36 +00:00
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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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|
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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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|
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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)) {
|
2010-02-26 21:37:41 +00:00
|
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|
rc = -EOPNOTSUPP;
|
2005-04-16 22:20:36 +00:00
|
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|
goto out_free;
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|
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}
|
|
|
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if (start != qout->range[i].start >> PAGE_SHIFT) {
|
2010-02-26 21:37:41 +00:00
|
|
|
rc = -EOPNOTSUPP;
|
2005-04-16 22:20:36 +00:00
|
|
|
goto out_free;
|
|
|
|
}
|
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|
|
start = (qout->range[i].end >> PAGE_SHIFT) + 1;
|
|
|
|
}
|
|
|
|
seg->vm_segtype = SEG_TYPE_EWEN;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* analyze diag output and update seg */
|
|
|
|
seg->start_addr = qout->segstart;
|
|
|
|
seg->end = qout->segend;
|
|
|
|
|
|
|
|
memcpy (seg->range, qout->range, 6*sizeof(struct qrange));
|
|
|
|
seg->segcnt = qout->segcnt;
|
|
|
|
|
|
|
|
rc = 0;
|
|
|
|
|
|
|
|
out_free:
|
2005-11-07 09:01:35 +00:00
|
|
|
kfree(qin);
|
|
|
|
kfree(qout);
|
2005-04-16 22:20:36 +00:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* get info about a segment
|
|
|
|
* possible return values:
|
|
|
|
* -ENOSYS : we are not running on VM
|
|
|
|
* -EIO : could not perform query diagnose
|
|
|
|
* -ENOENT : no such segment
|
2010-02-26 21:37:41 +00:00
|
|
|
* -EOPNOTSUPP: multi-part segment cannot be used with linux
|
2005-04-16 22:20:36 +00:00
|
|
|
* -ENOMEM : out of memory
|
|
|
|
* 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
segment_type (char* name)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
struct dcss_segment seg;
|
|
|
|
|
|
|
|
if (!MACHINE_IS_VM)
|
|
|
|
return -ENOSYS;
|
|
|
|
|
|
|
|
dcss_mkname(name, seg.dcss_name);
|
|
|
|
rc = query_segment_type (&seg);
|
|
|
|
if (rc < 0)
|
|
|
|
return rc;
|
|
|
|
return seg.vm_segtype;
|
|
|
|
}
|
|
|
|
|
2008-10-10 19:33:21 +00:00
|
|
|
/*
|
|
|
|
* check if segment collides with other segments that are currently loaded
|
|
|
|
* returns 1 if this is the case, 0 if no collision was found
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
segment_overlaps_others (struct dcss_segment *seg)
|
|
|
|
{
|
|
|
|
struct list_head *l;
|
|
|
|
struct dcss_segment *tmp;
|
|
|
|
|
|
|
|
BUG_ON(!mutex_is_locked(&dcss_lock));
|
|
|
|
list_for_each(l, &dcss_list) {
|
|
|
|
tmp = list_entry(l, struct dcss_segment, list);
|
|
|
|
if ((tmp->start_addr >> 20) > (seg->end >> 20))
|
|
|
|
continue;
|
|
|
|
if ((tmp->end >> 20) < (seg->start_addr >> 20))
|
|
|
|
continue;
|
|
|
|
if (seg == tmp)
|
|
|
|
continue;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/*
|
|
|
|
* real segment loading function, called from segment_load
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
__segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end)
|
|
|
|
{
|
2008-10-10 19:33:21 +00:00
|
|
|
unsigned long start_addr, end_addr, dummy;
|
2010-06-08 16:58:09 +00:00
|
|
|
struct dcss_segment *seg;
|
|
|
|
int rc, diag_cc;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2011-05-23 08:24:29 +00:00
|
|
|
start_addr = end_addr = 0;
|
2010-06-08 16:58:09 +00:00
|
|
|
seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (seg == NULL) {
|
|
|
|
rc = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
dcss_mkname (name, seg->dcss_name);
|
|
|
|
rc = query_segment_type (seg);
|
|
|
|
if (rc < 0)
|
|
|
|
goto out_free;
|
2006-12-08 14:56:07 +00:00
|
|
|
|
2008-10-10 19:33:21 +00:00
|
|
|
if (loadshr_scode == DCSS_LOADSHRX) {
|
|
|
|
if (segment_overlaps_others(seg)) {
|
|
|
|
rc = -EBUSY;
|
|
|
|
goto out_free;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-04-30 11:38:47 +00:00
|
|
|
rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
|
2006-12-08 14:56:07 +00:00
|
|
|
|
2008-04-17 05:46:31 +00:00
|
|
|
if (rc)
|
2005-04-16 22:20:36 +00:00
|
|
|
goto out_free;
|
2006-12-08 14:56:07 +00:00
|
|
|
|
2007-02-05 20:17:11 +00:00
|
|
|
seg->res = kzalloc(sizeof(struct resource), GFP_KERNEL);
|
|
|
|
if (seg->res == NULL) {
|
|
|
|
rc = -ENOMEM;
|
|
|
|
goto out_shared;
|
|
|
|
}
|
|
|
|
seg->res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
|
|
|
|
seg->res->start = seg->start_addr;
|
|
|
|
seg->res->end = seg->end;
|
|
|
|
memcpy(&seg->res_name, seg->dcss_name, 8);
|
|
|
|
EBCASC(seg->res_name, 8);
|
|
|
|
seg->res_name[8] = '\0';
|
|
|
|
strncat(seg->res_name, " (DCSS)", 7);
|
|
|
|
seg->res->name = seg->res_name;
|
|
|
|
rc = seg->vm_segtype;
|
|
|
|
if (rc == SEG_TYPE_SC ||
|
|
|
|
((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared))
|
|
|
|
seg->res->flags |= IORESOURCE_READONLY;
|
|
|
|
if (request_resource(&iomem_resource, seg->res)) {
|
|
|
|
rc = -EBUSY;
|
|
|
|
kfree(seg->res);
|
|
|
|
goto out_shared;
|
|
|
|
}
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
if (do_nonshared)
|
2008-10-10 19:33:21 +00:00
|
|
|
diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
|
|
|
|
&start_addr, &end_addr);
|
2005-04-16 22:20:36 +00:00
|
|
|
else
|
2008-10-10 19:33:21 +00:00
|
|
|
diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
|
|
|
|
&start_addr, &end_addr);
|
|
|
|
if (diag_cc < 0) {
|
|
|
|
dcss_diag(&purgeseg_scode, seg->dcss_name,
|
|
|
|
&dummy, &dummy);
|
|
|
|
rc = diag_cc;
|
|
|
|
goto out_resource;
|
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
if (diag_cc > 1) {
|
2016-03-04 04:49:57 +00:00
|
|
|
pr_warn("Loading DCSS %s failed with rc=%ld\n", name, end_addr);
|
2008-10-10 19:33:21 +00:00
|
|
|
rc = dcss_diag_translate_rc(end_addr);
|
|
|
|
dcss_diag(&purgeseg_scode, seg->dcss_name,
|
|
|
|
&dummy, &dummy);
|
2007-02-05 20:17:11 +00:00
|
|
|
goto out_resource;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2008-10-10 19:33:21 +00:00
|
|
|
seg->start_addr = start_addr;
|
|
|
|
seg->end = end_addr;
|
2005-04-16 22:20:36 +00:00
|
|
|
seg->do_nonshared = do_nonshared;
|
|
|
|
atomic_set(&seg->ref_count, 1);
|
|
|
|
list_add(&seg->list, &dcss_list);
|
|
|
|
*addr = seg->start_addr;
|
|
|
|
*end = seg->end;
|
|
|
|
if (do_nonshared)
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_info("DCSS %s of range %p to %p and type %s loaded as "
|
|
|
|
"exclusive-writable\n", name, (void*) seg->start_addr,
|
|
|
|
(void*) seg->end, segtype_string[seg->vm_segtype]);
|
2007-02-05 20:17:11 +00:00
|
|
|
else {
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_info("DCSS %s of range %p to %p and type %s loaded in "
|
|
|
|
"shared access mode\n", name, (void*) seg->start_addr,
|
|
|
|
(void*) seg->end, segtype_string[seg->vm_segtype]);
|
2007-02-05 20:17:11 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
goto out;
|
2007-02-05 20:17:11 +00:00
|
|
|
out_resource:
|
|
|
|
release_resource(seg->res);
|
|
|
|
kfree(seg->res);
|
2006-12-08 14:56:07 +00:00
|
|
|
out_shared:
|
2008-04-30 11:38:47 +00:00
|
|
|
vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
|
2005-04-16 22:20:36 +00:00
|
|
|
out_free:
|
2005-11-07 09:01:35 +00:00
|
|
|
kfree(seg);
|
2005-04-16 22:20:36 +00:00
|
|
|
out:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* this function loads a DCSS segment
|
|
|
|
* name : name of the DCSS
|
|
|
|
* do_nonshared : 0 indicates that the dcss should be shared with other linux images
|
|
|
|
* 1 indicates that the dcss should be exclusive for this linux image
|
|
|
|
* addr : will be filled with start address of the segment
|
|
|
|
* end : will be filled with end address of the segment
|
|
|
|
* return values:
|
|
|
|
* -ENOSYS : we are not running on VM
|
|
|
|
* -EIO : could not perform query or load diagnose
|
|
|
|
* -ENOENT : no such segment
|
2010-02-26 21:37:41 +00:00
|
|
|
* -EOPNOTSUPP: multi-part segment cannot be used with linux
|
2005-04-16 22:20:36 +00:00
|
|
|
* -ENOSPC : segment cannot be used (overlaps with storage)
|
|
|
|
* -EBUSY : segment can temporarily not be used (overlaps with dcss)
|
|
|
|
* -ERANGE : segment cannot be used (exceeds kernel mapping range)
|
|
|
|
* -EPERM : segment is currently loaded with incompatible permissions
|
|
|
|
* -ENOMEM : out of memory
|
|
|
|
* 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
segment_load (char *name, int do_nonshared, unsigned long *addr,
|
|
|
|
unsigned long *end)
|
|
|
|
{
|
|
|
|
struct dcss_segment *seg;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
if (!MACHINE_IS_VM)
|
|
|
|
return -ENOSYS;
|
|
|
|
|
2006-12-04 14:40:51 +00:00
|
|
|
mutex_lock(&dcss_lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
seg = segment_by_name (name);
|
|
|
|
if (seg == NULL)
|
|
|
|
rc = __segment_load (name, do_nonshared, addr, end);
|
|
|
|
else {
|
|
|
|
if (do_nonshared == seg->do_nonshared) {
|
|
|
|
atomic_inc(&seg->ref_count);
|
|
|
|
*addr = seg->start_addr;
|
|
|
|
*end = seg->end;
|
|
|
|
rc = seg->vm_segtype;
|
|
|
|
} else {
|
|
|
|
*addr = *end = 0;
|
|
|
|
rc = -EPERM;
|
|
|
|
}
|
|
|
|
}
|
2006-12-04 14:40:51 +00:00
|
|
|
mutex_unlock(&dcss_lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* this function modifies the shared state of a DCSS segment. note that
|
|
|
|
* name : name of the DCSS
|
|
|
|
* do_nonshared : 0 indicates that the dcss should be shared with other linux images
|
|
|
|
* 1 indicates that the dcss should be exclusive for this linux image
|
|
|
|
* return values:
|
|
|
|
* -EIO : could not perform load diagnose (segment gone!)
|
|
|
|
* -ENOENT : no such segment (segment gone!)
|
|
|
|
* -EAGAIN : segment is in use by other exploiters, try later
|
|
|
|
* -EINVAL : no segment with the given name is currently loaded - name invalid
|
2007-02-05 20:17:11 +00:00
|
|
|
* -EBUSY : segment can temporarily not be used (overlaps with dcss)
|
2005-04-16 22:20:36 +00:00
|
|
|
* 0 : operation succeeded
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
segment_modify_shared (char *name, int do_nonshared)
|
|
|
|
{
|
|
|
|
struct dcss_segment *seg;
|
2008-10-10 19:33:21 +00:00
|
|
|
unsigned long start_addr, end_addr, dummy;
|
|
|
|
int rc, diag_cc;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2011-05-23 08:24:29 +00:00
|
|
|
start_addr = end_addr = 0;
|
2006-12-04 14:40:51 +00:00
|
|
|
mutex_lock(&dcss_lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
seg = segment_by_name (name);
|
|
|
|
if (seg == NULL) {
|
|
|
|
rc = -EINVAL;
|
|
|
|
goto out_unlock;
|
|
|
|
}
|
|
|
|
if (do_nonshared == seg->do_nonshared) {
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_info("DCSS %s is already in the requested access "
|
|
|
|
"mode\n", name);
|
2005-04-16 22:20:36 +00:00
|
|
|
rc = 0;
|
|
|
|
goto out_unlock;
|
|
|
|
}
|
|
|
|
if (atomic_read (&seg->ref_count) != 1) {
|
2016-03-04 04:49:57 +00:00
|
|
|
pr_warn("DCSS %s is in use and cannot be reloaded\n", name);
|
2005-04-16 22:20:36 +00:00
|
|
|
rc = -EAGAIN;
|
|
|
|
goto out_unlock;
|
|
|
|
}
|
2007-02-05 20:17:11 +00:00
|
|
|
release_resource(seg->res);
|
2008-10-10 19:33:21 +00:00
|
|
|
if (do_nonshared)
|
2007-02-05 20:17:11 +00:00
|
|
|
seg->res->flags &= ~IORESOURCE_READONLY;
|
2008-10-10 19:33:21 +00:00
|
|
|
else
|
2007-02-05 20:17:11 +00:00
|
|
|
if (seg->vm_segtype == SEG_TYPE_SR ||
|
|
|
|
seg->vm_segtype == SEG_TYPE_ER)
|
|
|
|
seg->res->flags |= IORESOURCE_READONLY;
|
2008-10-10 19:33:21 +00:00
|
|
|
|
2007-02-05 20:17:11 +00:00
|
|
|
if (request_resource(&iomem_resource, seg->res)) {
|
2016-03-04 04:49:57 +00:00
|
|
|
pr_warn("DCSS %s overlaps with used memory resources and cannot be reloaded\n",
|
|
|
|
name);
|
2007-02-05 20:17:11 +00:00
|
|
|
rc = -EBUSY;
|
|
|
|
kfree(seg->res);
|
2008-10-10 19:33:21 +00:00
|
|
|
goto out_del_mem;
|
|
|
|
}
|
|
|
|
|
|
|
|
dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
|
|
|
|
if (do_nonshared)
|
|
|
|
diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name,
|
|
|
|
&start_addr, &end_addr);
|
|
|
|
else
|
|
|
|
diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name,
|
|
|
|
&start_addr, &end_addr);
|
|
|
|
if (diag_cc < 0) {
|
|
|
|
rc = diag_cc;
|
|
|
|
goto out_del_res;
|
2007-02-05 20:17:11 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
if (diag_cc > 1) {
|
2016-03-04 04:49:57 +00:00
|
|
|
pr_warn("Reloading DCSS %s failed with rc=%ld\n",
|
|
|
|
name, end_addr);
|
2008-10-10 19:33:21 +00:00
|
|
|
rc = dcss_diag_translate_rc(end_addr);
|
|
|
|
goto out_del_res;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2008-10-10 19:33:21 +00:00
|
|
|
seg->start_addr = start_addr;
|
|
|
|
seg->end = end_addr;
|
2005-04-16 22:20:36 +00:00
|
|
|
seg->do_nonshared = do_nonshared;
|
|
|
|
rc = 0;
|
|
|
|
goto out_unlock;
|
2008-10-10 19:33:21 +00:00
|
|
|
out_del_res:
|
|
|
|
release_resource(seg->res);
|
|
|
|
kfree(seg->res);
|
|
|
|
out_del_mem:
|
2008-04-30 11:38:47 +00:00
|
|
|
vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
|
2005-04-16 22:20:36 +00:00
|
|
|
list_del(&seg->list);
|
2008-10-10 19:33:21 +00:00
|
|
|
dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
|
2005-11-07 09:01:35 +00:00
|
|
|
kfree(seg);
|
2005-04-16 22:20:36 +00:00
|
|
|
out_unlock:
|
2006-12-04 14:40:51 +00:00
|
|
|
mutex_unlock(&dcss_lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Decrease the use count of a DCSS segment and remove
|
|
|
|
* it from the address space if nobody is using it
|
|
|
|
* any longer.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
segment_unload(char *name)
|
|
|
|
{
|
|
|
|
unsigned long dummy;
|
|
|
|
struct dcss_segment *seg;
|
|
|
|
|
|
|
|
if (!MACHINE_IS_VM)
|
|
|
|
return;
|
|
|
|
|
2006-12-04 14:40:51 +00:00
|
|
|
mutex_lock(&dcss_lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
seg = segment_by_name (name);
|
|
|
|
if (seg == NULL) {
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_err("Unloading unknown DCSS %s failed\n", name);
|
2005-04-16 22:20:36 +00:00
|
|
|
goto out_unlock;
|
|
|
|
}
|
2006-12-08 14:56:07 +00:00
|
|
|
if (atomic_dec_return(&seg->ref_count) != 0)
|
|
|
|
goto out_unlock;
|
2007-02-05 20:17:11 +00:00
|
|
|
release_resource(seg->res);
|
|
|
|
kfree(seg->res);
|
2008-04-30 11:38:47 +00:00
|
|
|
vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1);
|
2006-12-08 14:56:07 +00:00
|
|
|
list_del(&seg->list);
|
2008-10-10 19:33:21 +00:00
|
|
|
dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy);
|
2006-12-08 14:56:07 +00:00
|
|
|
kfree(seg);
|
2005-04-16 22:20:36 +00:00
|
|
|
out_unlock:
|
2006-12-04 14:40:51 +00:00
|
|
|
mutex_unlock(&dcss_lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* save segment content permanently
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
segment_save(char *name)
|
|
|
|
{
|
|
|
|
struct dcss_segment *seg;
|
|
|
|
char cmd1[160];
|
|
|
|
char cmd2[80];
|
2006-04-28 01:40:22 +00:00
|
|
|
int i, response;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
if (!MACHINE_IS_VM)
|
|
|
|
return;
|
|
|
|
|
2006-12-04 14:40:51 +00:00
|
|
|
mutex_lock(&dcss_lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
seg = segment_by_name (name);
|
|
|
|
|
|
|
|
if (seg == NULL) {
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_err("Saving unknown DCSS %s failed\n", name);
|
2006-12-04 14:40:20 +00:00
|
|
|
goto out;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
sprintf(cmd1, "DEFSEG %s", name);
|
|
|
|
for (i=0; i<seg->segcnt; i++) {
|
2008-10-10 19:33:21 +00:00
|
|
|
sprintf(cmd1+strlen(cmd1), " %lX-%lX %s",
|
2005-04-16 22:20:36 +00:00
|
|
|
seg->range[i].start >> PAGE_SHIFT,
|
|
|
|
seg->range[i].end >> PAGE_SHIFT,
|
|
|
|
segtype_string[seg->range[i].start & 0xff]);
|
|
|
|
}
|
|
|
|
sprintf(cmd2, "SAVESEG %s", name);
|
2006-04-28 01:40:22 +00:00
|
|
|
response = 0;
|
|
|
|
cpcmd(cmd1, NULL, 0, &response);
|
|
|
|
if (response) {
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_err("Saving a DCSS failed with DEFSEG response code "
|
|
|
|
"%i\n", response);
|
2006-04-28 01:40:22 +00:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
cpcmd(cmd2, NULL, 0, &response);
|
|
|
|
if (response) {
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_err("Saving a DCSS failed with SAVESEG response code "
|
|
|
|
"%i\n", response);
|
2006-04-28 01:40:22 +00:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
out:
|
2006-12-04 14:40:51 +00:00
|
|
|
mutex_unlock(&dcss_lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2008-04-17 05:46:31 +00:00
|
|
|
/*
|
|
|
|
* print appropriate error message for segment_load()/segment_type()
|
|
|
|
* return code
|
|
|
|
*/
|
|
|
|
void segment_warning(int rc, char *seg_name)
|
|
|
|
{
|
|
|
|
switch (rc) {
|
|
|
|
case -ENOENT:
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_err("DCSS %s cannot be loaded or queried\n", seg_name);
|
2008-04-17 05:46:31 +00:00
|
|
|
break;
|
|
|
|
case -ENOSYS:
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_err("DCSS %s cannot be loaded or queried without "
|
|
|
|
"z/VM\n", seg_name);
|
2008-04-17 05:46:31 +00:00
|
|
|
break;
|
|
|
|
case -EIO:
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_err("Loading or querying DCSS %s resulted in a "
|
|
|
|
"hardware error\n", seg_name);
|
2008-04-17 05:46:31 +00:00
|
|
|
break;
|
2010-02-26 21:37:41 +00:00
|
|
|
case -EOPNOTSUPP:
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_err("DCSS %s has multiple page ranges and cannot be "
|
|
|
|
"loaded or queried\n", seg_name);
|
2008-04-17 05:46:31 +00:00
|
|
|
break;
|
|
|
|
case -ENOSPC:
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_err("DCSS %s overlaps with used storage and cannot "
|
|
|
|
"be loaded\n", seg_name);
|
2008-04-17 05:46:31 +00:00
|
|
|
break;
|
|
|
|
case -EBUSY:
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_err("%s needs used memory resources and cannot be "
|
|
|
|
"loaded or queried\n", seg_name);
|
2008-04-17 05:46:31 +00:00
|
|
|
break;
|
|
|
|
case -EPERM:
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_err("DCSS %s is already loaded in a different access "
|
|
|
|
"mode\n", seg_name);
|
2008-04-17 05:46:31 +00:00
|
|
|
break;
|
|
|
|
case -ENOMEM:
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_err("There is not enough memory to load or query "
|
|
|
|
"DCSS %s\n", seg_name);
|
2008-04-17 05:46:31 +00:00
|
|
|
break;
|
|
|
|
case -ERANGE:
|
2008-12-25 12:39:45 +00:00
|
|
|
pr_err("DCSS %s exceeds the kernel mapping range (%lu) "
|
|
|
|
"and cannot be loaded\n", seg_name, VMEM_MAX_PHYS);
|
2008-04-17 05:46:31 +00:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
EXPORT_SYMBOL(segment_load);
|
|
|
|
EXPORT_SYMBOL(segment_unload);
|
|
|
|
EXPORT_SYMBOL(segment_save);
|
|
|
|
EXPORT_SYMBOL(segment_type);
|
|
|
|
EXPORT_SYMBOL(segment_modify_shared);
|
2008-04-17 05:46:31 +00:00
|
|
|
EXPORT_SYMBOL(segment_warning);
|