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655 lines
16 KiB
655 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Author(s)......: Carsten Otte <[email protected]> |
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* Rob M van der Heij <[email protected]> |
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* Steven Shultz <[email protected]> |
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* Bugreports.to..: <[email protected]> |
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* Copyright IBM Corp. 2002, 2004 |
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*/ |
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|
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#define KMSG_COMPONENT "extmem" |
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
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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/export.h> |
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#include <linux/memblock.h> |
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#include <linux/ctype.h> |
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#include <linux/ioport.h> |
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#include <linux/refcount.h> |
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#include <linux/pgtable.h> |
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#include <asm/diag.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 <asm/setup.h> |
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#define DCSS_PURGESEG 0x08 |
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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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#define DCSS_FINDSEGA 0x0c |
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|
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struct qrange { |
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unsigned long start; /* last byte type */ |
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unsigned long end; /* last byte reserved */ |
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}; |
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struct qout64 { |
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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 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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char res_name[16]; |
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unsigned long start_addr; |
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unsigned long end; |
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refcount_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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struct resource *res; |
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}; |
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static DEFINE_MUTEX(dcss_lock); |
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static LIST_HEAD(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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static int loadshr_scode = DCSS_LOADSHRX; |
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static int loadnsr_scode = DCSS_LOADNSRX; |
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static int purgeseg_scode = DCSS_PURGESEG; |
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static int segext_scode = DCSS_SEGEXTX; |
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|
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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 |
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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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BUG_ON(!mutex_is_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(int *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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diag_stat_inc(DIAG_STAT_X064); |
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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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*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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int diag_cc, rc, i; |
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struct qout64 *qout; |
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struct qin64 *qin; |
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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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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(&segext_scode, qin, &dummy, &vmrc); |
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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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if (diag_cc > 1) { |
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pr_warn("Querying a DCSS type failed with rc=%ld\n", vmrc); |
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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 = -EOPNOTSUPP; |
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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 = -EOPNOTSUPP; |
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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 = -EOPNOTSUPP; |
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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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kfree(qin); |
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kfree(qout); |
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return rc; |
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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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* -EOPNOTSUPP: multi-part segment cannot be used with linux |
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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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* 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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BUG_ON(!mutex_is_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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* 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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unsigned long start_addr, end_addr, dummy; |
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struct dcss_segment *seg; |
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int rc, diag_cc; |
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start_addr = end_addr = 0; |
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seg = kmalloc(sizeof(*seg), GFP_KERNEL | GFP_DMA); |
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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_overlaps_others(seg)) { |
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rc = -EBUSY; |
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goto out_free; |
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} |
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seg->res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
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if (seg->res == NULL) { |
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rc = -ENOMEM; |
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goto out_free; |
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} |
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seg->res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; |
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seg->res->start = seg->start_addr; |
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seg->res->end = seg->end; |
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memcpy(&seg->res_name, seg->dcss_name, 8); |
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EBCASC(seg->res_name, 8); |
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seg->res_name[8] = '\0'; |
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strlcat(seg->res_name, " (DCSS)", sizeof(seg->res_name)); |
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seg->res->name = seg->res_name; |
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rc = seg->vm_segtype; |
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if (rc == SEG_TYPE_SC || |
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((rc == SEG_TYPE_SR || rc == SEG_TYPE_ER) && !do_nonshared)) |
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seg->res->flags |= IORESOURCE_READONLY; |
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/* Check for overlapping resources before adding the mapping. */ |
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if (request_resource(&iomem_resource, seg->res)) { |
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rc = -EBUSY; |
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goto out_free_resource; |
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} |
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rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1); |
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if (rc) |
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goto out_resource; |
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if (do_nonshared) |
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diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name, |
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&start_addr, &end_addr); |
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else |
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diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name, |
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&start_addr, &end_addr); |
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if (diag_cc < 0) { |
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dcss_diag(&purgeseg_scode, seg->dcss_name, |
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&dummy, &dummy); |
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rc = diag_cc; |
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goto out_mapping; |
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} |
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if (diag_cc > 1) { |
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pr_warn("Loading DCSS %s failed with rc=%ld\n", name, end_addr); |
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rc = dcss_diag_translate_rc(end_addr); |
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dcss_diag(&purgeseg_scode, seg->dcss_name, |
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&dummy, &dummy); |
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goto out_mapping; |
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} |
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seg->start_addr = start_addr; |
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seg->end = end_addr; |
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seg->do_nonshared = do_nonshared; |
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refcount_set(&seg->ref_count, 1); |
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list_add(&seg->list, &dcss_list); |
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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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pr_info("DCSS %s of range %px to %px and type %s loaded as " |
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"exclusive-writable\n", name, (void*) seg->start_addr, |
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(void*) seg->end, segtype_string[seg->vm_segtype]); |
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else { |
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pr_info("DCSS %s of range %px to %px and type %s loaded in " |
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"shared access mode\n", name, (void*) seg->start_addr, |
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(void*) seg->end, segtype_string[seg->vm_segtype]); |
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} |
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goto out; |
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out_mapping: |
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vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); |
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out_resource: |
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release_resource(seg->res); |
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out_free_resource: |
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kfree(seg->res); |
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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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* -EOPNOTSUPP: multi-part segment cannot be used with linux |
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* -EBUSY : segment cannot be used (overlaps with dcss or storage) |
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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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mutex_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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refcount_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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mutex_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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* -EBUSY : segment can temporarily not be used (overlaps with dcss) |
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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 start_addr, end_addr, dummy; |
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int rc, diag_cc; |
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start_addr = end_addr = 0; |
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mutex_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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pr_info("DCSS %s is already in the requested access " |
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"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 (refcount_read(&seg->ref_count) != 1) { |
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pr_warn("DCSS %s is in use and cannot be reloaded\n", name); |
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rc = -EAGAIN; |
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goto out_unlock; |
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} |
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release_resource(seg->res); |
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if (do_nonshared) |
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seg->res->flags &= ~IORESOURCE_READONLY; |
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else |
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if (seg->vm_segtype == SEG_TYPE_SR || |
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seg->vm_segtype == SEG_TYPE_ER) |
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seg->res->flags |= IORESOURCE_READONLY; |
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|
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if (request_resource(&iomem_resource, seg->res)) { |
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pr_warn("DCSS %s overlaps with used memory resources and cannot be reloaded\n", |
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name); |
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rc = -EBUSY; |
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kfree(seg->res); |
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goto out_del_mem; |
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} |
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|
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dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy); |
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if (do_nonshared) |
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diag_cc = dcss_diag(&loadnsr_scode, seg->dcss_name, |
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&start_addr, &end_addr); |
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else |
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diag_cc = dcss_diag(&loadshr_scode, seg->dcss_name, |
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&start_addr, &end_addr); |
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if (diag_cc < 0) { |
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rc = diag_cc; |
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goto out_del_res; |
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} |
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if (diag_cc > 1) { |
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pr_warn("Reloading DCSS %s failed with rc=%ld\n", |
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name, end_addr); |
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rc = dcss_diag_translate_rc(end_addr); |
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goto out_del_res; |
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} |
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seg->start_addr = start_addr; |
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seg->end = end_addr; |
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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_res: |
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release_resource(seg->res); |
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kfree(seg->res); |
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out_del_mem: |
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vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); |
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list_del(&seg->list); |
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dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy); |
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kfree(seg); |
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out_unlock: |
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mutex_unlock(&dcss_lock); |
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return rc; |
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} |
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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. |
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*/ |
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void |
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segment_unload(char *name) |
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{ |
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unsigned long dummy; |
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struct dcss_segment *seg; |
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|
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if (!MACHINE_IS_VM) |
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return; |
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|
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mutex_lock(&dcss_lock); |
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seg = segment_by_name (name); |
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if (seg == NULL) { |
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pr_err("Unloading unknown DCSS %s failed\n", name); |
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goto out_unlock; |
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} |
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if (!refcount_dec_and_test(&seg->ref_count)) |
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goto out_unlock; |
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release_resource(seg->res); |
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kfree(seg->res); |
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vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); |
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list_del(&seg->list); |
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dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy); |
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kfree(seg); |
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out_unlock: |
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mutex_unlock(&dcss_lock); |
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} |
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|
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/* |
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* save segment content permanently |
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*/ |
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void |
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segment_save(char *name) |
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{ |
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struct dcss_segment *seg; |
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char cmd1[160]; |
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char cmd2[80]; |
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int i, response; |
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|
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if (!MACHINE_IS_VM) |
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return; |
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|
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mutex_lock(&dcss_lock); |
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seg = segment_by_name (name); |
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|
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if (seg == NULL) { |
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pr_err("Saving unknown DCSS %s failed\n", name); |
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goto out; |
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} |
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|
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sprintf(cmd1, "DEFSEG %s", name); |
|
for (i=0; i<seg->segcnt; i++) { |
|
sprintf(cmd1+strlen(cmd1), " %lX-%lX %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); |
|
response = 0; |
|
cpcmd(cmd1, NULL, 0, &response); |
|
if (response) { |
|
pr_err("Saving a DCSS failed with DEFSEG response code " |
|
"%i\n", response); |
|
goto out; |
|
} |
|
cpcmd(cmd2, NULL, 0, &response); |
|
if (response) { |
|
pr_err("Saving a DCSS failed with SAVESEG response code " |
|
"%i\n", response); |
|
goto out; |
|
} |
|
out: |
|
mutex_unlock(&dcss_lock); |
|
} |
|
|
|
/* |
|
* print appropriate error message for segment_load()/segment_type() |
|
* return code |
|
*/ |
|
void segment_warning(int rc, char *seg_name) |
|
{ |
|
switch (rc) { |
|
case -ENOENT: |
|
pr_err("DCSS %s cannot be loaded or queried\n", seg_name); |
|
break; |
|
case -ENOSYS: |
|
pr_err("DCSS %s cannot be loaded or queried without " |
|
"z/VM\n", seg_name); |
|
break; |
|
case -EIO: |
|
pr_err("Loading or querying DCSS %s resulted in a " |
|
"hardware error\n", seg_name); |
|
break; |
|
case -EOPNOTSUPP: |
|
pr_err("DCSS %s has multiple page ranges and cannot be " |
|
"loaded or queried\n", seg_name); |
|
break; |
|
case -EBUSY: |
|
pr_err("%s needs used memory resources and cannot be " |
|
"loaded or queried\n", seg_name); |
|
break; |
|
case -EPERM: |
|
pr_err("DCSS %s is already loaded in a different access " |
|
"mode\n", seg_name); |
|
break; |
|
case -ENOMEM: |
|
pr_err("There is not enough memory to load or query " |
|
"DCSS %s\n", seg_name); |
|
break; |
|
case -ERANGE: |
|
pr_err("DCSS %s exceeds the kernel mapping range (%lu) " |
|
"and cannot be loaded\n", seg_name, VMEM_MAX_PHYS); |
|
break; |
|
default: |
|
break; |
|
} |
|
} |
|
|
|
EXPORT_SYMBOL(segment_load); |
|
EXPORT_SYMBOL(segment_unload); |
|
EXPORT_SYMBOL(segment_save); |
|
EXPORT_SYMBOL(segment_type); |
|
EXPORT_SYMBOL(segment_modify_shared); |
|
EXPORT_SYMBOL(segment_warning);
|
|
|