Hi Linus,
forget the first try of the xpram driver for 2.5.22. I added some suggestions
from Christoph Hellwig. One of them was to remove the xpram_release function
since it is not needed. I removed the function but not the reference in the
block device operations structure. Oh, well, its late. Here is the working
version.
blue skies,
Martin.
diff -urN linux-2.5.22/drivers/s390/block/xpram.c linux-2.5.22-s390/drivers/s390/block/xpram.c
--- linux-2.5.22/drivers/s390/block/xpram.c Mon Jun 17 04:31:35 2002
+++ linux-2.5.22-s390/drivers/s390/block/xpram.c Mon Jun 17 22:54:15 2002
@@ -1,4 +1,3 @@
-
/*
* Xpram.c -- the S/390 expanded memory RAM-disk
*
@@ -8,137 +7,66 @@
*
* Author of XPRAM specific coding: Reinhard Buendgen
* [email protected]
+ * Rewrite for 2.5: Martin Schwidefsky <[email protected]>
*
* External interfaces:
* Interfaces to linux kernel
- * xpram_setup: read kernel parameters (see init/main.c)
- * xpram_init: initialize device driver (see drivers/block/ll_rw_blk.c)
- * Module interfaces
- * init_module
- * cleanup_module
+ * xpram_setup: read kernel parameters
* Device specific file operations
* xpram_iotcl
* xpram_open
- * xpram_release
*
- * "ad-hoc" partitioning:
+ * "ad-hoc" partitioning:
* the expanded memory can be partitioned among several devices
* (with different minors). The partitioning set up can be
* set by kernel or module parameters (int devs & int sizes[])
*
- * module parameters: devs= and sizes=
- * kernel parameters: xpram_parts=
- * note: I did not succeed in parsing numbers
- * for module parameters of type string "s" ?!?
- *
- * Other kenel files/modules affected(gerp for "xpram" or "XPRAM":
- * drivers/s390/Config.in
- * drivers/s390/block/Makefile
- * include/linux/blk.h
- * include/linux/major.h
- * init/main.c
- * drivers/block//ll_rw_blk.c
- *
- *
* Potential future improvements:
- * request clustering: first coding started not yet tested or integrated
- * I doubt that it really pays off
* generic hard disk support to replace ad-hoc partitioning
- *
- * Tested with 2.2.14 (under VM)
*/
-#ifdef MODULE
-# ifndef __KERNEL__
-# define __KERNEL__
-# endif
-# define __NO_VERSION__ /* don't define kernel_version in module.h */
-#endif /* MODULE */
-
#include <linux/module.h>
#include <linux/version.h>
-
-#ifdef MODULE
-char kernel_version [] = UTS_RELEASE;
-#endif
-
-#include <linux/config.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/kernel.h> /* printk() */
-#include <linux/slab.h> /* kmalloc() */
-#include <linux/devfs_fs_kernel.h>
-#include <linux/fs.h> /* everything... */
-#include <linux/errno.h> /* error codes */
-#include <linux/timer.h>
-#include <linux/types.h> /* size_t */
#include <linux/ctype.h> /* isdigit, isxdigit */
-#include <linux/fcntl.h> /* O_ACCMODE */
-#include <linux/hdreg.h> /* HDIO_GETGEO */
-
-#include <asm/system.h> /* cli(), *_flags */
-#include <asm/uaccess.h> /* put_user */
-
-#define MAJOR_NR xpram_major /* force definitions on in blk.h */
-int xpram_major; /* must be declared before including blk.h */
-devfs_handle_t xpram_devfs_handle;
-
-#define DEVICE_NR(device) MINOR(device) /* xpram has no partition bits */
-#define DEVICE_NO_RANDOM /* no entropy to contribute */
-#define DEVICE_OFF(d) /* do-nothing */
-
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
#include <linux/blk.h>
+#include <linux/blkpg.h>
+#include <linux/hdreg.h> /* HDIO_GETGEO */
+#include <linux/device.h>
+#include <asm/uaccess.h>
-#include "xpram.h" /* local definitions */
-
-__setup("xpram_parts=", xpram_setup);
-
-/*
- define the debug levels:
- - 0 No debugging output to console or syslog
- - 1 Log internal errors to syslog, ignore check conditions
- - 2 Log internal errors and check conditions to syslog
- - 3 Log internal errors to console, log check conditions to syslog
- - 4 Log internal errors and check conditions to console
- - 5 panic on internal errors, log check conditions to console
- - 6 panic on both, internal errors and check conditions
- */
-#define XPRAM_DEBUG 4
+#define XPRAM_NAME "xpram"
+#define XPRAM_DEVS 1 /* one partition */
+#define XPRAM_MAX_DEVS 32 /* maximal number of devices (partitions) */
+
+#define PRINT_DEBUG(x...) printk(KERN_DEBUG XPRAM_NAME " debug:" x)
+#define PRINT_INFO(x...) printk(KERN_INFO XPRAM_NAME " info:" x)
+#define PRINT_WARN(x...) printk(KERN_WARNING XPRAM_NAME " warning:" x)
+#define PRINT_ERR(x...) printk(KERN_ERR XPRAM_NAME " error:" x)
+
+static struct device xpram_sys_device = {
+ name: "S/390 expanded memory RAM disk",
+ bus_id: "xpram",
+};
-#define PRINTK_HEADER XPRAM_NAME
-
-#if XPRAM_DEBUG > 0
-#define PRINT_DEBUG(x...) printk ( KERN_DEBUG PRINTK_HEADER "debug:" x )
-#define PRINT_INFO(x...) printk ( KERN_INFO PRINTK_HEADER "info:" x )
-#define PRINT_WARN(x...) printk ( KERN_WARNING PRINTK_HEADER "warning:" x )
-#define PRINT_ERR(x...) printk ( KERN_ERR PRINTK_HEADER "error:" x )
-#define PRINT_FATAL(x...) panic ( PRINTK_HEADER "panic:"x )
-#else
-#define PRINT_DEBUG(x...) printk ( KERN_DEBUG PRINTK_HEADER "debug:" x )
-#define PRINT_INFO(x...) printk ( KERN_DEBUG PRINTK_HEADER "info:" x )
-#define PRINT_WARN(x...) printk ( KERN_DEBUG PRINTK_HEADER "warning:" x )
-#define PRINT_ERR(x...) printk ( KERN_DEBUG PRINTK_HEADER "error:" x )
-#define PRINT_FATAL(x...) printk ( KERN_DEBUG PRINTK_HEADER "panic:" x )
-#endif
+typedef struct {
+ unsigned long size; /* size of xpram segment in pages */
+ unsigned long offset; /* start page of xpram segment */
+} xpram_device_t;
+
+static xpram_device_t xpram_devices[XPRAM_MAX_DEVS];
+static int xpram_sizes[XPRAM_MAX_DEVS];
+static unsigned long xpram_pages;
+static int xpram_devs;
+static devfs_handle_t xpram_devfs_handle;
/*
- * Non-prefixed symbols are static. They are meant to be assigned at
- * load time. Prefixed symbols are not static, so they can be used in
- * debugging. They are hidden anyways by register_symtab() unless
- * XPRAM_DEBUG is defined.
+ * Parameter parsing functions.
*/
-
-static int major = XPRAM_MAJOR;
-static int devs = XPRAM_DEVS;
-static int sizes[XPRAM_MAX_DEVS] = { 0, };
-static int blksize = XPRAM_BLKSIZE;
-static int hardsect = XPRAM_HARDSECT;
-
-int xpram_devs;
-int xpram_blksize, xpram_hardsect;
-int xpram_mem_avail = 0;
-unsigned long xpram_sizes[XPRAM_MAX_DEVS];
-
+static int devs = XPRAM_DEVS;
+static unsigned long sizes[XPRAM_MAX_DEVS];
MODULE_PARM(devs,"i");
MODULE_PARM(sizes,"1-" __MODULE_STRING(XPRAM_MAX_DEVS) "i");
@@ -150,930 +78,451 @@
"All devices with size 0 equally partition the "
"remaining space on the expanded strorage not "
"claimed by explicit sizes\n");
+MODULE_LICENSE("GPL");
-
-
-/* The following items are obtained through kmalloc() in init_module() */
-
-Xpram_Dev *xpram_devices = NULL;
-int *xpram_offsets = NULL; /* partition offsets */
-
-#define MIN(x,y) ((x) < (y) ? (x) : (y))
-#define MAX(x,y) ((x) > (y) ? (x) : (y))
-
-/*
- * compute nearest multiple of 4 , argument must be non-negative
- * the macros used depends on XPRAM_KB_IN_PG = 4
- */
-
-#define NEXT4(x) ((x & 0x3) ? (x+4-(x &0x3)) : (x)) /* increment if needed */
-#define LAST4(x) ((x & 0x3) ? (x-4+(x & 0x3)) : (x)) /* decrement if needed */
-
-#if 0 /* this is probably not faster than the previous code */
-#define NEXT4(x) ((((x-1)>>2)>>2)+4) /* increment if needed */
-#define LAST4(x) (((x+3)>>2)<<2) /* decrement if needed */
-#endif
-
-/* integer formats */
-#define XPRAM_INVALF -1 /* invalid */
-#define XPRAM_HEXF 0 /* hexadecimal */
-#define XPRAM_DECF 1 /* decimal */
-
-/*
- * parsing operations (needed for kernel parameter parsing)
- */
-
-/* -------------------------------------------------------------------------
- * sets the string pointer after the next comma
- *
- * argument: strptr pointer to string
- * side effect: strptr points to endof string or to position of the next
- * comma
- * ------------------------------------------------------------------------*/
-static void
-xpram_scan_to_next_comma (char **strptr)
-{
- while ( ((**strptr) != ',') && (**strptr) )
- (*strptr)++;
-}
-
-/* -------------------------------------------------------------------------
- * interpret character as hex-digit
+#ifndef MODULE
+/*
+ * Parses the kernel parameters given in the kernel parameter line.
+ * The expected format is
+ * <number_of_partitions>[","<partition_size>]*
+ * where
+ * devices is a positive integer that initializes xpram_devs
+ * each size is a non-negative integer possibly followed by a
+ * magnitude (k,K,m,M,g,G), the list of sizes initialises
+ * xpram_sizes
*
- * argument: c charcter
- * result: c interpreted as hex-digit
- * note: can be used to read digits for any base <= 16
- * ------------------------------------------------------------------------*/
-static int
-xpram_get_hexdigit (char c)
-{
- if ((c >= '0') && (c <= '9'))
- return c - '0';
- if ((c >= 'a') && (c <= 'f'))
- return c + 10 - 'a';
- if ((c >= 'A') && (c <= 'F'))
- return c + 10 - 'A';
- return -1;
-}
-
-/*--------------------------------------------------------------------------
- * Check format of unsigned integer
+ * Arguments
+ * str: substring of kernel parameter line that contains xprams
+ * kernel parameters.
*
- * Argument: strptr pointer to string
- * result: -1 if strptr does not start with a digit
- * (does not start an integer)
- * 0 if strptr starts a positive hex-integer with "0x"
- * 1 if strptr start a positive decimal integer
+ * Result 0 on success, -EINVAL else -- only for Version > 2.3
*
- * side effect: if strptr start a positive hex-integer then strptr is
- * set to the character after the "0x"
- *-------------------------------------------------------------------------*/
-static int
-xpram_int_format(char **strptr)
+ * Side effects
+ * the global variabls devs is set to the value of
+ * <number_of_partitions> and sizes[i] is set to the i-th
+ * partition size (if provided). A parsing error of a value
+ * results in this value being set to -EINVAL.
+ */
+static int __init xpram_setup (char *str)
{
- if ( !isdigit(**strptr) )
- return XPRAM_INVALF;
- if ( (**strptr == '0')
- && ( (*((*strptr)+1) == 'x') || (*((*strptr) +1) == 'X') )
- && isdigit(*((*strptr)+3)) ) {
- *strptr=(*strptr)+2;
- return XPRAM_HEXF;
- } else return XPRAM_DECF;
-}
-
-/*--------------------------------------------------------------------------
- * Read non-negative decimal integer
- *
- * Argument: strptr pointer to string starting with a non-negative integer
- * in decimal format
- * result: the value of theinitial integer pointed to by strptr
- *
- * side effect: strptr is set to the first character following the integer
- *-------------------------------------------------------------------------*/
+ char *cp;
+ int i;
-static int
-xpram_read_decint (char ** strptr)
-{
- int res=0;
- while ( isdigit(**strptr) ) {
- res = (res*10) + xpram_get_hexdigit(**strptr);
- (*strptr)++;
- }
- return res;
+ devs = simple_strtoul(str, &cp, 10);
+ if (cp <= str || devs > XPRAM_MAX_DEVS)
+ return 0;
+ for (i = 0; (i < devs) && (*cp++ == ','); i++) {
+ sizes[i] = simple_strtoul(cp, &cp, 10);
+ if (*cp == 'g' || *cp == 'G') {
+ sizes[i] <<= 20;
+ cp++;
+ } else if (*cp == 'm' || *cp == 'M') {
+ sizes[i] <<= 10;
+ cp++;
+ } else if (*cp == 'k' || *cp == 'K')
+ cp++;
+ while (isspace(*cp)) cp++;
+ }
+ if (*cp == ',' && i >= devs)
+ PRINT_WARN("partition sizes list has too many entries.\n");
+ else if (*cp != 0)
+ PRINT_WARN("ignored '%s' at end of parameter string.\n", cp);
+ return 1;
}
-/*--------------------------------------------------------------------------
- * Read non-negative hex-integer
- *
- * Argument: strptr pointer to string starting with a non-negative integer
- * in hexformat (without "0x" prefix)
- * result: the value of the initial integer pointed to by strptr
- *
- * side effect: strptr is set to the first character following the integer
- *-------------------------------------------------------------------------*/
+__setup("xpram_parts=", xpram_setup);
+#endif
-static int
-xpram_read_hexint (char ** strptr)
-{
- int res=0;
- while ( isxdigit(**strptr) ) {
- res = (res<<4) + xpram_get_hexdigit(**strptr);
- (*strptr)++;
- }
- return res;
+/*
+ * Copy expanded memory page (4kB) into main memory
+ * Arguments
+ * page_addr: address of target page
+ * xpage_index: index of expandeded memory page
+ * Return value
+ * 0: if operation succeeds
+ * -EIO: if pgin failed
+ * -ENXIO: if xpram has vanished
+ */
+static int xpram_page_in (unsigned long page_addr, unsigned long xpage_index)
+{
+ int cc;
+
+ __asm__ __volatile(
+ " lhi %0,2\n" /* return unused cc 2 if pgin traps */
+ " .insn rre,0xb22e0000,%1,%2\n" /* pgin %1,%2 */
+ "0: ipm %0\n"
+ " srl %0,28\n"
+ "1:\n"
+#ifndef CONFIG_ARCH_S390X
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 0b,1b\n"
+ ".previous"
+#else
+ ".section __ex_table,\"a\"\n"
+ " .align 8\n"
+ " .quad 0b,1b\n"
+ ".previous"
+#endif
+ : "=&d" (cc)
+ : "a" (__pa(page_addr)), "a" (xpage_index)
+ : "cc" );
+ if (cc == 3)
+ return -ENXIO;
+ if (cc == 2) {
+ PRINT_ERR("expanded storage lost!\n");
+ return -ENXIO;
+ }
+ if (cc == 1) {
+ PRINT_ERR("page in failed for page index %ld.\n",
+ xpage_index);
+ return -EIO;
+ }
+ return 0;
}
-/*--------------------------------------------------------------------------
- * Read non-negative integer
- *
- * Argument: strptr pointer to string starting with a non-negative integer
- (either in decimal- or in hex-format
- * result: the value of the initial integer pointed to by strptr
- * in case of a parsing error the result is -EINVAL
- *
- * side effect: strptr is set to the first character following the integer
- *-------------------------------------------------------------------------*/
-static int
-xpram_read_int (char ** strptr)
-{
- switch ( xpram_int_format(strptr) ) {
- case XPRAM_INVALF: return -EINVAL;
- case XPRAM_HEXF: return xpram_read_hexint(strptr);
- case XPRAM_DECF: return xpram_read_decint(strptr);
- default: return -EINVAL;
+/*
+ * Copy a 4kB page of main memory to an expanded memory page
+ * Arguments
+ * page_addr: address of source page
+ * xpage_index: index of expandeded memory page
+ * Return value
+ * 0: if operation succeeds
+ * -EIO: if pgout failed
+ * -ENXIO: if xpram has vanished
+ */
+static long xpram_page_out (unsigned long page_addr, unsigned long xpage_index)
+{
+ int cc;
+
+ __asm__ __volatile(
+ " lhi %0,2\n" /* return unused cc 2 if pgout traps */
+ " .insn rre,0xb22f0000,%1,%2\n" /* pgout %1,%2 */
+ "0: ipm %0\n"
+ " srl %0,28\n"
+ "1:\n"
+#ifndef CONFIG_ARCH_S390X
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 0b,1b\n"
+ ".previous"
+#else
+ ".section __ex_table,\"a\"\n"
+ " .align 8\n"
+ " .quad 0b,1b\n"
+ ".previous"
+#endif
+ : "=&d" (cc)
+ : "a" (__pa(page_addr)), "a" (xpage_index)
+ : "cc" );
+ if (cc == 3)
+ return -ENXIO;
+ if (cc == 2) {
+ PRINT_ERR("expanded storage lost!\n");
+ return -ENXIO;
}
-}
-
-/*--------------------------------------------------------------------------
- * Read size
- *
- * Argument: strptr pointer to string starting with a non-negative integer
- * followed optionally by a size modifier:
- * k or K for kilo (default),
- * m or M for mega
- * g or G for giga
- * result: the value of the initial integer pointed to by strptr
- * multiplied by the modifier value devided by 1024
- * in case of a parsing error the result is -EINVAL
- *
- * side effect: strptr is set to the first character following the size
- *-------------------------------------------------------------------------*/
-
-static int
-xpram_read_size (char ** strptr)
-{
- int res;
-
- res=xpram_read_int(strptr);
- if ( res < 0 )return res;
- switch ( **strptr ) {
- case 'g':
- case 'G': res=res*1024;
- case 'm':
- case 'M': res=res*1024;
- case 'k' :
- case 'K' : (* strptr)++;
+ if (cc == 1) {
+ PRINT_ERR("page out failed for page index %ld.\n",
+ xpage_index);
+ return -EIO;
}
-
- return res;
+ return 0;
}
+/*
+ * Check if xpram is available.
+ */
+static int __init xpram_present(void)
+{
+ unsigned long mem_page;
+ int rc;
-/*--------------------------------------------------------------------------
- * Read tail of comma separated size list ",i1,i2,...,in"
- *
- * Arguments:strptr pointer to string. It is assumed that the string has
- * the format (","<size>)*
- * maxl integer describing the maximal number of elements in the
- list pointed to by strptr, max must be > 0.
- * ilist array of dimension >= maxl of integers to be modified
- *
- * result: -EINVAL if the list is longer than maxl
- * 0 otherwise
- *
- * side effects: for j=1,...,n ilist[ij] is set to the value of ij if it is
- * a valid non-negative integer and to -EINVAL otherwise
- * if no comma is found where it is expected an entry in
- * ilist is set to -EINVAL
- *-------------------------------------------------------------------------*/
-static int
-xpram_read_size_list_tail (char ** strptr, int maxl, int * ilist)
-{
- int i=0;
- char *str = *strptr;
- int res=0;
-
- while ( (*str == ',') && (i < maxl) ) {
- str++;
- ilist[i] = xpram_read_size(&str);
- if ( ilist[i] == -EINVAL ) {
- xpram_scan_to_next_comma(&str);
- res = -EINVAL;
- }
- i++;
- }
- return res;
-#if 0 /* be lenient about trailing stuff */
- if ( *str != 0 && *str != ' ' ) {
- ilist[MAX(i-1,0)] = -EINVAL;
- return -EINVAL;
- } else return 0;
-#endif
+ mem_page = (unsigned long) __get_free_page(GFP_KERNEL);
+ rc = xpram_page_in(mem_page, 0);
+ free_page(mem_page);
+ return rc ? -ENXIO : 0;
}
-
/*
- * expanded memory operations
+ * Return index of the last available xpram page.
*/
-
-
-/*--------------------------------------------------------------------*/
-/* Copy expanded memory page (4kB) into main memory */
-/* Arguments */
-/* page_addr: address of target page */
-/* xpage_index: index of expandeded memory page */
-/* Return value */
-/* 0: if operation succeeds */
-/* non-0: otherwise */
-/*--------------------------------------------------------------------*/
-long xpram_page_in (unsigned long page_addr, unsigned long xpage_index)
+static unsigned long __init xpram_highest_page_index(void)
{
- int cc=0;
- unsigned long real_page_addr = __pa(page_addr);
-#ifndef CONFIG_ARCH_S390X
- __asm__ __volatile__ (
- " lr 1,%1 \n" /* r1 = real_page_addr */
- " lr 2,%2 \n" /* r2 = xpage_index */
- " .long 0xb22e0012 \n" /* pgin r1,r2 */
- /* copy page from expanded memory */
- "0: ipm %0 \n" /* save status (cc & program mask */
- " srl %0,28 \n" /* cc into least significant bits */
- "1: \n" /* we are done */
- ".section .fixup,\"ax\"\n" /* start of fix up section */
- "2: lhi %0,2 \n" /* return unused condition code 2 */
- " bras 1,3f \n" /* safe label 1: in r1 and goto 3 */
- " .long 1b \n" /* literal containing label 1 */
- "3: l 1,0(1) \n" /* load label 1 address into r1 */
- " br 1 \n" /* goto label 1 (across sections) */
- ".previous \n" /* back in text section */
- ".section __ex_table,\"a\"\n" /* start __extable */
- " .align 4 \n"
- " .long 0b,2b \n" /* failure point 0, fixup code 2 */
- ".previous \n"
- : "=d" (cc) : "d" (real_page_addr), "d" (xpage_index) : "cc", "1", "2"
- );
-#else /* CONFIG_ARCH_S390X */
- __asm__ __volatile__ (
- " lgr 1,%1 \n" /* r1 = real_page_addr */
- " lgr 2,%2 \n" /* r2 = xpage_index */
- " .long 0xb22e0012 \n" /* pgin r1,r2 */
- /* copy page from expanded memory */
- "0: ipm %0 \n" /* save status (cc & program mask */
- " srl %0,28 \n" /* cc into least significant bits */
- "1: \n" /* we are done */
- ".section .fixup,\"ax\"\n" /* start of fix up section */
- "2: lghi %0,2 \n" /* return unused condition code 2 */
- " jg 1b \n" /* goto label 1 above */
- ".previous \n" /* back in text section */
- ".section __ex_table,\"a\"\n" /* start __extable */
- " .align 8 \n"
- " .quad 0b,2b \n" /* failure point 0, fixup code 2 */
- ".previous \n"
- : "=d" (cc) : "d" (real_page_addr), "d" (xpage_index) : "cc", "1", "2"
- );
-#endif /* CONFIG_ARCH_S390X */
- switch (cc) {
- case 0: return 0;
- case 1: return -EIO;
- case 2: return -ENXIO;
- case 3: return -ENXIO;
- default: return -EIO; /* should not happen */
- };
-}
+ unsigned long page_index, add_bit;
+ unsigned long mem_page;
-/*--------------------------------------------------------------------*/
-/* Copy a 4kB page of main memory to an expanded memory page */
-/* Arguments */
-/* page_addr: address of source page */
-/* xpage_index: index of expandeded memory page */
-/* Return value */
-/* 0: if operation succeeds */
-/* non-0: otherwise */
-/*--------------------------------------------------------------------*/
-long xpram_page_out (unsigned long page_addr, unsigned long xpage_index)
-{
- int cc=0;
- unsigned long real_page_addr = __pa(page_addr);
-#ifndef CONFIG_ARCH_S390X
- __asm__ __volatile__ (
- " lr 1,%1 \n" /* r1 = mem_page */
- " lr 2,%2 \n" /* r2 = rpi */
- " .long 0xb22f0012 \n" /* pgout r1,r2 */
- /* copy page from expanded memory */
- "0: ipm %0 \n" /* save status (cc & program mask */
- " srl %0,28 \n" /* cc into least significant bits */
- "1: \n" /* we are done */
- ".section .fixup,\"ax\"\n" /* start of fix up section */
- "2: lhi %0,2 \n" /* return unused condition code 2 */
- " bras 1,3f \n" /* safe label 1: in r1 and goto 3 */
- " .long 1b \n" /* literal containing label 1 */
- "3: l 1,0(1) \n" /* load label 1 address into r1 */
- " br 1 \n" /* goto label 1 (across sections) */
- ".previous \n" /* back in text section */
- ".section __ex_table,\"a\"\n" /* start __extable */
- " .align 4 \n"
- " .long 0b,2b \n" /* failure point 0, fixup code 2 */
- ".previous \n"
- : "=d" (cc) : "d" (real_page_addr), "d" (xpage_index) : "cc", "1", "2"
- );
-#else /* CONFIG_ARCH_S390X */
- __asm__ __volatile__ (
- " lgr 1,%1 \n" /* r1 = mem_page */
- " lgr 2,%2 \n" /* r2 = rpi */
- " .long 0xb22f0012 \n" /* pgout r1,r2 */
- /* copy page from expanded memory */
- "0: ipm %0 \n" /* save status (cc & program mask */
- " srl %0,28 \n" /* cc into least significant bits */
- "1: \n" /* we are done */
- ".section .fixup,\"ax\"\n" /* start of fix up section */
- "2: lghi %0,2 \n" /* return unused condition code 2 */
- " jg 1b \n" /* goto label 1 above */
- ".previous \n" /* back in text section */
- ".section __ex_table,\"a\"\n" /* start __extable */
- " .align 8 \n"
- " .quad 0b,2b \n" /* failure point 0, fixup code 2 */
- ".previous \n"
- : "=d" (cc) : "d" (real_page_addr), "d" (xpage_index) : "cc", "1", "2"
- );
-#endif /* CONFIG_ARCH_S390X */
- switch (cc) {
- case 0: return 0;
- case 1: return -EIO;
- case 2: { PRINT_ERR("expanded storage lost!\n"); return -ENXIO; }
- case 3: return -ENXIO;
- default: return -EIO; /* should not happen */
- }
-}
+ mem_page = (unsigned long) __get_free_page(GFP_KERNEL);
-/*--------------------------------------------------------------------*/
-/* Measure expanded memory */
-/* Return value */
-/* size of expanded memory in kB (must be a multipe of 4) */
-/*--------------------------------------------------------------------*/
-int xpram_size(void)
-{
- int cc=0;
- unsigned long base=0;
- unsigned long po, pi, rpi; /* page index order, page index */
-
- unsigned long mem_page = __get_free_page(GFP_KERNEL);
-
- /* for po=0,1,2,... try to move in page number base+(2^po)-1 */
- pi=1;
- for (po=0; po <= 32; po++) { /* pi = 2^po */
- cc=xpram_page_in(mem_page,base+pi-1);
- if ( cc ) break;
- pi <<= 1;
- }
- if ( cc && (po < 31 ) ) {
- pi >>=1;
- base += pi;
- pi >>=1;
- for ( ; pi > 0; pi >>= 1) {
- rpi = pi - 1;
- cc=xpram_page_in(mem_page,base+rpi);
- if ( !cc ) base += pi;
- }
+ page_index = 0;
+ add_bit = 1ULL << (sizeof(unsigned long)*8 - 1);
+ while (add_bit > 0) {
+ if (xpram_page_in(mem_page, page_index | add_bit) == 0)
+ page_index |= add_bit;
+ add_bit >>= 1;
}
-
+
free_page (mem_page);
- if ( cc && (po < 31) )
- return (XPRAM_KB_IN_PG * base);
- else /* return maximal value possible */
- return INT_MAX;
+ return page_index;
}
/*
- * Open and close
+ * Block device make request function.
*/
-
-int xpram_open (struct inode *inode, struct file *filp)
+static int xpram_make_request(request_queue_t *q, struct bio *bio)
{
- Xpram_Dev *dev; /* device information */
- int num = MINOR(inode->i_rdev);
-
-
- if (num >= xpram_devs) return -ENODEV;
- dev = xpram_devices + num;
-
- PRINT_DEBUG("calling xpram_open for device %d\n",num);
- PRINT_DEBUG(" size %dkB, name %s, usage: %d\n",
- dev->size,dev->device_name, atomic_read(&(dev->usage)));
+ xpram_device_t *xdev;
+ struct bio_vec *bvec;
+ unsigned long index;
+ unsigned long page_addr;
+ unsigned long bytes;
+ int i;
- atomic_inc(&(dev->usage));
- return 0; /* success */
+ if (MINOR(bio->bi_bdev->bd_dev) > xpram_devs)
+ /* No such device. */
+ goto fail;
+ xdev = xpram_devices + MINOR(bio->bi_bdev->bd_dev);
+ if ((bio->bi_sector & 3) != 0 || (bio->bi_size & 4095) != 0)
+ /* Request is not page-aligned. */
+ goto fail;
+ if ((bio->bi_size >> 12) > xdev->size)
+ /* Request size is no page-aligned. */
+ goto fail;
+ index = (bio->bi_sector >> 3) + xdev->offset;
+ bio_for_each_segment(bvec, bio, i) {
+ page_addr = (unsigned long)
+ kmap(bvec->bv_page) + bvec->bv_offset;
+ bytes = bvec->bv_len;
+ if ((page_addr & 4095) != 0 || (bytes & 4095) != 0)
+ /* More paranoia. */
+ goto fail;
+ while (bytes > 0) {
+ if (bio_data_dir(bio) == READ) {
+ if (xpram_page_in(page_addr, index) != 0)
+ goto fail;
+ } else {
+ if (xpram_page_out(page_addr, index) != 0)
+ goto fail;
+ }
+ page_addr += 4096;
+ bytes -= 4096;
+ index++;
+ }
+ }
+ set_bit(BIO_UPTODATE, &bio->bi_flags);
+ bio->bi_end_io(bio);
+ return 0;
+fail:
+ bio_io_error(bio);
+ return 0;
}
-int xpram_release (struct inode *inode, struct file *filp)
+/*
+ * The file operations
+ */
+static int xpram_open (struct inode *inode, struct file *filp)
{
- Xpram_Dev *dev = xpram_devices + MINOR(inode->i_rdev);
-
- PRINT_DEBUG("calling xpram_release for device %d (size %dkB, usage: %d)\n",MINOR(inode->i_rdev) ,dev->size,atomic_read(&(dev->usage)));
-
- /*
- * If the device is closed for the last time, start a timer
- * to release RAM in half a minute. The function and argument
- * for the timer have been setup in init_module()
- */
- if (!atomic_dec_return(&(dev->usage))) {
- /* but flush it right now */
- /* Everything is already flushed by caller -- AV */
- }
- return(0);
+ if (minor(inode->i_rdev) >= xpram_devs)
+ return -ENODEV;
+ return 0;
}
-/*
- * The ioctl() implementation
- */
-
-int xpram_ioctl (struct inode *inode, struct file *filp,
+static int xpram_ioctl (struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
{
- int err, size;
- struct hd_geometry *geo = (struct hd_geometry *)arg;
+ struct hd_geometry *geo;
+ unsigned long size;
+ int idx;
- PRINT_DEBUG("ioctl 0x%x 0x%lx\n", cmd, arg);
- switch(cmd) {
-
- case BLKGETSIZE: /* 0x1260 */
+ if ((!inode) || kdev_none(inode->i_rdev))
+ return -EINVAL;
+ idx = minor(inode->i_rdev);
+ if (idx >= xpram_devs)
+ return -ENODEV;
+ switch (cmd) {
+ case BLKGETSIZE:
/* Return the device size, expressed in sectors */
- return put_user( 1024* xpram_sizes[MINOR(inode->i_rdev)]
- / XPRAM_SOFTSECT,
- (unsigned long *) arg);
-
+ return put_user(xpram_sizes[idx] << 1, (unsigned long *) arg);
case BLKGETSIZE64:
- return put_user( (u64)(1024* xpram_sizes[MINOR(inode->i_rdev)]
- / XPRAM_SOFTSECT) << 9,
- (u64 *) arg);
-
- case BLKFLSBUF: /* flush, 0x1261 */
- fsync_bdev(inode->i_bdev);
- if ( capable(CAP_SYS_ADMIN) )invalidate_bdev(inode->i_bdev, 0);
- return 0;
-
- case BLKRRPART: /* re-read partition table: can't do it, 0x1259 */
+ /* Return the device size, expressed in bytes */
+ return put_user((u64) xpram_sizes[idx] << 10, (u64 *) arg);
+ case BLKFLSBUF:
+ return blk_ioctl(((struct inode *) inode)->i_bdev, cmd, arg);
+ case BLKRRPART:
+ /* re-read partition table: can't do it */
return -EINVAL;
-
case HDIO_GETGEO:
/*
* get geometry: we have to fake one... trim the size to a
* multiple of 64 (32k): tell we have 16 sectors, 4 heads,
* whatever cylinders. Tell also that data starts at sector. 4.
*/
- size = xpram_mem_avail * 1024 / XPRAM_SOFTSECT;
- /* size = xpram_mem_avail * 1024 / xpram_hardsect; */
- size &= ~0x3f; /* multiple of 64 */
- if (geo==NULL) return -EINVAL;
- /*
- * err=verify_area_20(VERIFY_WRITE, geo, sizeof(*geo));
- * if (err) return err;
- */
-
+ geo = (struct hd_geometry *) arg;
+ if (geo == NULL)
+ return -EINVAL;
+ size = (xpram_pages * 8) & ~0x3f;
put_user(size >> 6, &geo->cylinders);
- put_user( 4, &geo->heads);
- put_user( 16, &geo->sectors);
- put_user( 4, &geo->start);
-
+ put_user(4, &geo->heads);
+ put_user(16, &geo->sectors);
+ put_user(4, &geo->start);
return 0;
+ default:
+ return -EINVAL;
}
-
- return -EINVAL; /* unknown command */
}
-/*
- * The file operations
- */
-struct block_device_operations xpram_devops =
+static struct block_device_operations xpram_devops =
{
owner: THIS_MODULE,
ioctl: xpram_ioctl,
open: xpram_open,
- release: xpram_release,
};
/*
- * Block-driver specific functions
- */
-
-void xpram_request(request_queue_t * queue)
-{
- Xpram_Dev *device;
- /* u8 *ptr; */
- /* int size; */
-
- unsigned long page_no; /* expanded memory page number */
- unsigned long sects_to_copy; /* number of sectors to be copied */
- char * buffer; /* local pointer into buffer cache */
- int dev_no; /* device number of request */
- int fault; /* faulty access to expanded memory */
- struct request * current_req; /* working request */
-
- while(1) {
- if (blk_queue_empty(QUEUE))
- return;
-
- fault=0;
- current_req = CURRENT;
- dev_no = DEVICE_NR(current_req->rq_dev);
- /* Check if the minor number is in range */
- if ( dev_no > xpram_devs ) {
- static int count = 0;
- if (count++ < 5) /* print the message at most five times */
- PRINT_WARN(" request for unknown device\n");
- end_request(CURRENT, 0);
- continue;
- }
-
- /* pointer to device structure, from the global array */
- device = xpram_devices + dev_no;
- sects_to_copy = current_req->current_nr_sectors;
- /* does request exceed size of device ? */
- if ( XPRAM_SEC2KB(sects_to_copy) > xpram_sizes[dev_no] ) {
- PRINT_WARN(" request past end of device\n");
- end_request(CURRENT, 0);
- continue;
- }
-
- /* Does request start at page boundery? -- paranoia */
-#if 0
- PRINT_DEBUG(" req %lx, sect %lx, to copy %lx, buf addr %lx\n", (unsigned long) current_req, current_req->sector, sects_to_copy, (unsigned long) current_req->buffer);
-#endif
- buffer = current_req->buffer;
-#if XPRAM_SEC_IN_PG != 1
- /* Does request start at an expanded storage page boundery? */
- if ( current_req->sector & (XPRAM_SEC_IN_PG - 1) ) {
- PRINT_WARN(" request does not start at an expanded storage page boundery\n");
- PRINT_WARN(" referenced sector: %ld\n",current_req->sector);
- end_request(CURRENT, 0);
- continue;
- }
- /* Does request refere to partial expanded storage pages? */
- if ( sects_to_copy & (XPRAM_SEC_IN_PG - 1) ) {
- PRINT_WARN(" request referes to a partial expanded storage page\n");
- end_request(CURRENT, 0);
- continue;
- }
-#endif /* XPRAM_SEC_IN_PG != 1 */
- /* Is request buffer aligned with kernel pages? */
- if ( ((unsigned long)buffer) & (XPRAM_PGSIZE-1) ) {
- PRINT_WARN(" request buffer is not aligned with kernel pages\n");
- end_request(CURRENT, 0);
- continue;
- }
-
- /* which page of expanded storage is affected first? */
- page_no = (xpram_offsets[dev_no] >> XPRAM_KB_IN_PG_ORDER)
- + (current_req->sector >> XPRAM_SEC_IN_PG_ORDER);
-
-#if 0
- PRINT_DEBUG("request: %d ( dev %d, copy %d sectors, at page %d ) \n", current_req->cmd,dev_no,sects_to_copy,page_no);
-#endif
-
- switch(current_req->cmd) {
- case READ:
- do {
- if ( (fault=xpram_page_in((unsigned long)buffer,page_no)) ) {
- PRINT_WARN("xpram(dev %d): page in failed for page %ld.\n",dev_no,page_no);
- break;
- }
- sects_to_copy -= XPRAM_SEC_IN_PG;
- buffer += XPRAM_PGSIZE;
- page_no++;
- } while ( sects_to_copy > 0 );
- break;
- case WRITE:
- do {
- if ( (fault=xpram_page_out((unsigned long)buffer,page_no))
- ) {
- PRINT_WARN("xpram(dev %d): page out failed for page %ld.\n",dev_no,page_no);
- break;
- }
- sects_to_copy -= XPRAM_SEC_IN_PG;
- buffer += XPRAM_PGSIZE;
- page_no++;
- } while ( sects_to_copy > 0 );
- break;
- default:
- /* can't happen */
- end_request(CURRENT, 0);
- continue;
- }
- if ( fault ) end_request(CURRENT, 0);
- else end_request(CURRENT, 1); /* success */
- }
-}
-
-/*
- * Kernel interfaces
+ * Setup xpram_sizes array.
*/
-
-/*
- * Parses the kernel parameters given in the kernel parameter line.
- * The expected format is
- * <number_of_partitions>[","<partition_size>]*
- * where
- * devices is a positive integer that initializes xpram_devs
- * each size is a non-negative integer possibly followed by a
- * magnitude (k,K,m,M,g,G), the list of sizes initialises
- * xpram_sizes
- *
- * Arguments
- * str: substring of kernel parameter line that contains xprams
- * kernel parameters.
- * ints: not used -- not in Version > 2.3 any more
- *
- * Result 0 on success, -EINVAl else -- only for Version > 2.3
- *
- * Side effects
- * the global variabls devs is set to the value of
- * <number_of_partitions> and sizes[i] is set to the i-th
- * partition size (if provided). A parsing error of a value
- * results in this value being set to -EINVAL.
- */
-int xpram_setup (char *str)
+static int __init xpram_setup_sizes(unsigned long pages)
{
- devs = xpram_read_int(&str);
- if ( devs != -EINVAL )
- if ( xpram_read_size_list_tail(&str,devs,sizes) < 0 ) {
- PRINT_ERR("error while reading xpram parameters.\n");
- return -EINVAL;
- }
- else
- return 0;
- else
- return -EINVAL;
-}
-
-/*
- * initialize xpram device driver
- *
- * Result: 0 ok
- * negative number: negative error code
- */
+ unsigned long mem_needed;
+ unsigned long mem_auto;
+ int mem_auto_no;
+ int i;
-int xpram_init(void)
-{
- int result, i;
- int mem_usable; /* net size of expanded memory */
- int mem_needed=0; /* size of expanded memory needed to fullfill
- * requirements of non-zero parameters in sizes
- */
-
- int mem_auto_no=0; /* number of (implicit) zero parameters in sizes */
- int mem_auto; /* automatically determined device size */
- int minor_length; /* store the length of a minor (w/o '\0') */
- int minor_thresh; /* threshhold for minor lenght */
-
- request_queue_t *q; /* request queue */
-
- /*
- * Copy the (static) cfg variables to public prefixed ones to allow
- * snoozing with a debugger.
- */
-
- xpram_blksize = blksize;
- xpram_hardsect = hardsect;
-
- PRINT_INFO("initializing: %s\n","");
- /* check arguments */
- xpram_major = major;
- if ( (devs <= 0) || (devs > XPRAM_MAX_DEVS) ) {
+ /* Check number of devices. */
+ if (devs <= 0 || devs > XPRAM_MAX_DEVS) {
PRINT_ERR("invalid number %d of devices\n",devs);
- PRINT_ERR("Giving up xpram\n");
return -EINVAL;
}
- xpram_devs = devs;
- for (i=0; i < xpram_devs; i++) {
- if ( sizes[i] < 0 ) {
- PRINT_ERR("Invalid partition size %d kB\n",xpram_sizes[i]);
- PRINT_ERR("Giving up xpram\n");
- return -EINVAL;
- } else {
- xpram_sizes[i] = NEXT4(sizes[i]); /* page align */
- if ( sizes[i] ) mem_needed += xpram_sizes[i];
- else mem_auto_no++;
- }
- }
-
- PRINT_DEBUG(" major %d \n", xpram_major);
- PRINT_INFO(" number of devices (partitions): %d \n", xpram_devs);
- for (i=0; i < xpram_devs; i++) {
- if ( sizes[i] )
- PRINT_INFO(" size of partition %d: %d kB\n", i, xpram_sizes[i]);
- else
- PRINT_INFO(" size of partition %d to be set automatically\n",i);
- }
- PRINT_DEBUG(" memory needed (for sized partitions): %d kB\n", mem_needed);
- PRINT_DEBUG(" partitions to be sized automatically: %d\n", mem_auto_no);
-
-#if 0
- /* Hardsect can't be changed :( */
- /* I try it any way. Yet I must distinguish
- * between hardsects (to be changed to 4096)
- * and soft sectors, hard-coded for buffer
- * sizes within the requests
- */
- if (hardsect != 512) {
- PRINT_ERR("Can't change hardsect size\n");
- hardsect = xpram_hardsect = 512;
- }
-#endif
- PRINT_INFO(" hardsector size: %dB \n",xpram_hardsect);
+ xpram_devs = devs;
/*
- * Register your major, and accept a dynamic number
+ * Copy sizes array to xpram_sizes and align partition
+ * sizes to page boundary.
*/
- result = devfs_register_blkdev(xpram_major, "xpram", &xpram_devops);
- if (result < 0) {
- PRINT_ERR("Can't get major %d\n",xpram_major);
- PRINT_ERR("Giving up xpram\n");
- return result;
+ mem_needed = 0;
+ mem_auto_no = 0;
+ for (i = 0; i < xpram_devs; i++) {
+ xpram_sizes[i] = (sizes[i] + 3) & -4UL;
+ if (xpram_sizes[i])
+ mem_needed += xpram_sizes[i];
+ else
+ mem_auto_no++;
}
- xpram_devfs_handle = devfs_mk_dir (NULL, "slram", NULL);
- devfs_register_series (xpram_devfs_handle, "%u", XPRAM_MAX_DEVS,
- DEVFS_FL_DEFAULT, XPRAM_MAJOR, 0,
- S_IFBLK | S_IRUSR | S_IWUSR,
- &xpram_devops, NULL);
- if (xpram_major == 0) xpram_major = result; /* dynamic */
- major = xpram_major; /* Use `major' later on to save typing */
-
- result = -ENOMEM; /* for the possible errors */
-
- /*
- * measure expanded memory
- */
-
- xpram_mem_avail = xpram_size();
- if (!xpram_mem_avail) {
- PRINT_ERR("No or not enough expanded memory available\n");
- PRINT_ERR("Giving up xpram\n");
- result = -ENODEV;
- goto fail_malloc;
+
+ PRINT_INFO(" number of devices (partitions): %d \n", xpram_devs);
+ for (i = 0; i < xpram_devs; i++) {
+ if (xpram_sizes[i])
+ PRINT_INFO(" size of partition %d: %d kB\n",
+ i, xpram_sizes[i]);
+ else
+ PRINT_INFO(" size of partition %d to be set "
+ "automatically\n",i);
}
- PRINT_INFO(" %d kB expanded memory found.\n",xpram_mem_avail );
+ PRINT_DEBUG(" memory needed (for sized partitions): %ld kB\n",
+ mem_needed);
+ PRINT_DEBUG(" partitions to be sized automatically: %d\n",
+ mem_auto_no);
- /*
- * Assign the other needed values: request, size, blksize,
- * hardsect. All the minor devices feature the same value.
- * Note that `xpram' defines all of them to allow testing non-default
- * values. A real device could well avoid setting values in global
- * arrays if it uses the default values.
- */
-
- q = BLK_DEFAULT_QUEUE(major);
- blk_init_queue (q, xpram_request);
- blk_queue_hardsect_size(q, xpram_hardsect);
-
- /* we want to have XPRAM_UNUSED blocks security buffer between devices */
- mem_usable=xpram_mem_avail-(XPRAM_UNUSED*(xpram_devs-1));
- if ( mem_needed > mem_usable ) {
+ if (mem_needed > pages * 4) {
PRINT_ERR("Not enough expanded memory available\n");
- PRINT_ERR("Giving up xpram\n");
- goto fail_malloc;
+ return -EINVAL;
}
/*
* partitioning:
* xpram_sizes[i] != 0; partition i has size xpram_sizes[i] kB
- * else: ; all partitions i with xpram_sizesxpram_size[i]
+ * else: ; all partitions with zero xpram_sizes[i]
* partition equally the remaining space
*/
+ if (mem_auto_no) {
+ mem_auto = ((pages - mem_needed / 4) / mem_auto_no) * 4;
+ PRINT_INFO(" automatically determined "
+ "partition size: %ld kB\n", mem_auto);
+ for (i = 0; i < xpram_devs; i++)
+ if (xpram_sizes[i] == 0)
+ xpram_sizes[i] = mem_auto;
+ }
+ return 0;
+}
+
+static int __init xpram_setup_blkdev(void)
+{
+ request_queue_t *q;
+ unsigned long offset;
+ int i, rc;
- if ( mem_auto_no ) {
- mem_auto=LAST4((mem_usable-mem_needed)/mem_auto_no);
- PRINT_INFO(" automatically determined partition size: %d kB\n", mem_auto);
- for (i=0; i < xpram_devs; i++)
- if (xpram_sizes[i] == 0) xpram_sizes[i] = mem_auto;
+ /*
+ * Register xpram major.
+ */
+ rc = devfs_register_blkdev(XPRAM_MAJOR, XPRAM_NAME, &xpram_devops);
+ if (rc < 0) {
+ PRINT_ERR("Can't get xpram major %d\n", XPRAM_MAJOR);
+ return rc;
}
- blk_size[major] = xpram_sizes;
- xpram_offsets = kmalloc(xpram_devs * sizeof(int), GFP_KERNEL);
- if (!xpram_offsets) {
- PRINT_ERR("Not enough memory for xpram_offsets\n");
- PRINT_ERR("Giving up xpram\n");
- goto fail_malloc;
- }
- xpram_offsets[0] = 0;
- for (i=1; i < xpram_devs; i++)
- xpram_offsets[i] = xpram_offsets[i-1] + xpram_sizes[i-1] + XPRAM_UNUSED;
-
-#if 0
- for (i=0; i < xpram_devs; i++)
- PRINT_DEBUG(" device(%d) offset = %d kB, size = %d kB\n",i, xpram_offsets[i], xpram_sizes[i]);
-#endif
+ xpram_devfs_handle = devfs_mk_dir (NULL, "slram", NULL);
+ devfs_register_series (xpram_devfs_handle, "%u", xpram_devs,
+ DEVFS_FL_DEFAULT, XPRAM_MAJOR, 0,
+ S_IFBLK | S_IRUSR | S_IWUSR,
+ &xpram_devops, NULL);
- /*
- * allocate the devices -- we can't have them static, as the number
- * can be specified at load time
+ /*
+ * Assign the other needed values: make request function, sizes and
+ * hardsect size. All the minor devices feature the same value.
*/
+ q = BLK_DEFAULT_QUEUE(XPRAM_MAJOR);
+ blk_queue_make_request(q,xpram_make_request);
+ blk_queue_hardsect_size(q, 4096);
+ blk_size[XPRAM_MAJOR] = xpram_sizes;
- xpram_devices = kmalloc(xpram_devs * sizeof (Xpram_Dev), GFP_KERNEL);
- if (!xpram_devices) {
- PRINT_ERR("Not enough memory for xpram_devices\n");
- PRINT_ERR("Giving up xpram\n");
- goto fail_malloc_devices;
- }
- memset(xpram_devices, 0, xpram_devs * sizeof (Xpram_Dev));
- minor_length = 1;
- minor_thresh = 10;
- for (i=0; i < xpram_devs; i++) {
- /* data and usage remain zeroed */
- xpram_devices[i].size = xpram_sizes[i]; /* size in kB not in bytes */
- atomic_set(&(xpram_devices[i].usage),0);
- if (i == minor_thresh) {
- minor_length++;
- minor_thresh *= 10;
- }
- xpram_devices[i].device_name =
- kmalloc(1 + strlen(XPRAM_DEVICE_NAME_PREFIX) + minor_length,GFP_KERNEL);
- if ( xpram_devices[i].device_name == NULL ) {
- PRINT_ERR("Not enough memory for xpram_devices[%d].device_name\n",i);
- PRINT_ERR("Giving up xpram\n");
- goto fail_devfs_register;
- }
- sprintf(xpram_devices[i].device_name,XPRAM_DEVICE_NAME_PREFIX "%d",i);
-
- PRINT_DEBUG("initializing xpram_open for device %d\n",i);
- PRINT_DEBUG(" size %dkB, name %s, usage: %d\n",
- xpram_devices[i].size,xpram_devices[i].device_name, atomic_read(&(xpram_devices[i].usage)));
-
-#if 0 /* WHY? */
- xpram_devices[i].devfs_entry =
- devfs_register(NULL /* devfs root dir */,
- xpram_devices[i].device_name, 0,
- 0 /* flags */,
- XPRAM_MAJOR,i,
- 0755 /* access mode */,
- 0 /* uid */, 0 /* gid */,
- &xpram_devops,
- (void *) &(xpram_devices[i])
- );
- if ( xpram_devices[i].devfs_entry == NULL ) {
- PRINT_ERR("devfs system registry failed\n");
- PRINT_ERR("Giving up xpram\n");
- goto fail_devfs_register;
- }
-#endif /* WHY? */
+ /*
+ * Setup device structures.
+ */
+ offset = 0;
+ for (i = 0; i < xpram_devs; i++) {
+ xpram_devices[i].size = xpram_sizes[i] / 4;
+ xpram_devices[i].offset = offset;
+ offset += xpram_devices[i].size;
}
- return 0; /* succeed */
-
- /* clean up memory in case of failures */
- fail_devfs_register:
- for (i=0; i < xpram_devs; i++) {
- if ( xpram_devices[i].device_name )
- kfree(xpram_devices[i].device_name);
- }
- kfree(xpram_devices);
- kfree (xpram_offsets);
- fail_malloc_devices:
- fail_malloc:
- /* ??? unregister_chrdev(major, "xpram"); */
- unregister_blkdev(major, "xpram");
- return result;
+ return 0;
}
/*
- * Finally, the module stuff
+ * Finally, the init/exit functions.
*/
-
-int init_module(void)
+static void __exit xpram_exit(void)
{
- int rc = 0;
-
- PRINT_INFO ("trying to load module\n");
- rc = xpram_init ();
- if (rc == 0) {
- PRINT_INFO ("Module loaded successfully\n");
- } else {
- PRINT_WARN ("Module load returned rc=%d\n", rc);
- }
- return rc;
+ blk_clear(XPRAM_MAJOR);
+ devfs_unregister_blkdev(XPRAM_MAJOR, XPRAM_NAME);
+ devfs_unregister(xpram_devfs_handle);
+ unregister_sys_device(&xpram_sys_device);
}
-void cleanup_module(void)
+static int __init xpram_init(void)
{
- int i;
-
- /* first of all, reset all the data structures */
- kfree(xpram_offsets);
- blk_clear(major);
+ int rc;
- /* finally, the usual cleanup */
- devfs_unregister(xpram_devfs_handle);
- if (devfs_unregister_blkdev(MAJOR_NR, "xpram"))
- printk(KERN_WARNING "xpram: cannot unregister blkdev\n");
- kfree(xpram_devices);
+ /* Find out size of expanded memory. */
+ if (xpram_present() != 0) {
+ PRINT_WARN("No expanded memory available\n");
+ return -ENODEV;
+ }
+ xpram_pages = xpram_highest_page_index();
+ PRINT_INFO(" %li pages expanded memory found (%li KB).\n",
+ xpram_pages, xpram_pages*4);
+ rc = xpram_setup_sizes(xpram_pages);
+ if (rc)
+ return rc;
+ rc = register_sys_device(&xpram_sys_device);
+ if (rc)
+ return rc;
+ rc = xpram_setup_blkdev();
+ if (rc)
+ unregister_sys_device(&xpram_sys_device);
+ return rc;
}
+
+module_init(xpram_init);
+module_exit(xpram_exit);
diff -urN linux-2.5.22/drivers/s390/block/xpram.h linux-2.5.22-s390/drivers/s390/block/xpram.h
--- linux-2.5.22/drivers/s390/block/xpram.h Mon Jun 17 04:31:32 2002
+++ linux-2.5.22-s390/drivers/s390/block/xpram.h Thu Jan 1 01:00:00 1970
@@ -1,70 +0,0 @@
-
-/*
- * xpram.h -- definitions for the char module
- *
- *********/
-
-
-#include <linux/ioctl.h>
-#include <asm/atomic.h>
-#include <linux/major.h>
-
-/* version dependencies have been confined to a separate file */
-
-/*
- * Macros to help debugging
- */
-
-#define XPRAM_NAME "xpram" /* name of device/module */
-#define XPRAM_DEVICE_NAME_PREFIX "slram" /* Prefix device name for major 35 */
-#define XPRAM_DEVS 1 /* one partition */
-#define XPRAM_RAHEAD 8 /* no real read ahead */
-#define XPRAM_PGSIZE 4096 /* page size of (expanded) mememory pages
- * according to S/390 architecture
- */
-#define XPRAM_BLKSIZE XPRAM_PGSIZE /* must be equalt to page size ! */
-#define XPRAM_HARDSECT XPRAM_PGSIZE /* FIXME -- we have to deal with both
- * this hard sect size and in some cases
- * hard coded 512 bytes which I call
- * soft sects:
- */
-#define XPRAM_SOFTSECT 512
-#define XPRAM_MAX_DEVS 32 /* maximal number of devices (partitions) */
-#define XPRAM_MAX_DEVS1 33 /* maximal number of devices (partitions) +1 */
-
-/* The following macros depend on the sizes above */
-
-#define XPRAM_KB_IN_PG 4 /* 4 kBs per page */
-#define XPRAM_KB_IN_PG_ORDER 2 /* 2^? kBs per page */
-
-/* Eventhough XPRAM_HARDSECT is set to 4k some data structures use hard
- * coded 512 byte sa sector size
- */
-#define XPRAM_SEC2KB(x) ((x >> 1) + (x & 1)) /* modifier used to compute size
- in kB from number of sectors */
-#define XPRAM_SEC_IN_PG 8 /* 8 sectors per page */
-#define XPRAM_SEC_IN_PG_ORDER 3 /* 2^? sectors per page */
-
-#define XPRAM_UNUSED 40 /* unused space between devices,
- * in kB, i.e.
- * must be a multiple of 4
- */
-/*
- * The xpram device is removable: if it is left closed for more than
- * half a minute, it is removed. Thus use a usage count and a
- * kernel timer
- */
-
-typedef struct Xpram_Dev {
- int size; /* size in KB not in Byte - RB - */
- atomic_t usage;
- char * device_name; /* device name prefix in devfs */
- devfs_handle_t devfs_entry; /* handle needed to unregister dev from devfs */
- u8 *data;
-} Xpram_Dev;
-
-/* 2.2: void xpram_setup (char *, int *); */
-/* begin 2.3 */
-int xpram_setup (char *);
-/* end 2.3 */
-int xpram_init(void);