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Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6

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* 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6:
  [S390] More verbose show_mem() like other architectures.
  [S390] Make use of kretprobe_assert.
  [S390] Wire up signald, timerfd and eventfd syscalls.
  [S390] Wire up sys_utimensat.
  [S390] cio: Update documentation.
This commit is contained in:
Linus Torvalds 2007-05-21 10:01:36 -07:00
commit 4b85df0419
6 changed files with 80 additions and 96 deletions
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82
Documentation/s390/cds.txt
View file

@ -51,13 +51,8 @@ The major changes are:
* The interrupt handlers must be adapted to use a ccw_device as argument.
Moreover, they don't return a devstat, but an irb.
* Before initiating an io, the options must be set via ccw_device_set_options().
read_dev_chars()
read device characteristics
read_conf_data()
read_conf_data_lpm()
read configuration data.
* Instead of calling read_dev_chars()/read_conf_data(), the driver issues
the channel program and handles the interrupt itself.
ccw_device_get_ciw()
get commands from extended sense data.
@ -130,11 +125,6 @@ present their hardware status by the same (shared) IRQ, the operating system
has to call every single device driver registered on this IRQ in order to
determine the device driver owning the device that raised the interrupt.
In order not to introduce a new I/O concept to the common Linux code,
Linux/390 preserves the IRQ concept and semantically maps the ESA/390
subchannels to Linux as IRQs. This allows Linux/390 to support up to 64k
different IRQs, uniquely representing a single device each.
Up to kernel 2.4, Linux/390 used to provide interfaces via the IRQ (subchannel).
For internal use of the common I/O layer, these are still there. However,
device drivers should use the new calling interface via the ccw_device only.
@ -151,9 +141,8 @@ information during their initialization step to recognize the devices they
support using the information saved in the struct ccw_device given to them.
This methods implies that Linux/390 doesn't require to probe for free (not
armed) interrupt request lines (IRQs) to drive its devices with. Where
applicable, the device drivers can use the read_dev_chars() to retrieve device
characteristics. This can be done without having to request device ownership
previously.
applicable, the device drivers can use issue the READ DEVICE CHARACTERISTICS
ccw to retrieve device characteristics in its online routine.
In order to allow for easy I/O initiation the CDS layer provides a
ccw_device_start() interface that takes a device specific channel program (one
@ -170,69 +159,6 @@ SUBCHANNEL (HSCH) command without having pending I/O requests. This function is
also covered by ccw_device_halt().
read_dev_chars() - Read Device Characteristics
This routine returns the characteristics for the device specified.
The function is meant to be called with the device already enabled; that is,
at earliest during set_online() processing.
The ccw_device must not be locked prior to calling read_dev_chars().
The function may be called enabled or disabled.
int read_dev_chars(struct ccw_device *cdev, void **buffer, int length );
cdev - the ccw_device the information is requested for.
buffer - pointer to a buffer pointer. The buffer pointer itself
must contain a valid buffer area.
length - length of the buffer provided.
The read_dev_chars() function returns :
0 - successful completion
-ENODEV - cdev invalid
-EINVAL - an invalid parameter was detected, or the function was called early.
-EBUSY - an irrecoverable I/O error occurred or the device is not
operational.
read_conf_data(), read_conf_data_lpm() - Read Configuration Data
Retrieve the device dependent configuration data. Please have a look at your
device dependent I/O commands for the device specific layout of the node
descriptor elements. read_conf_data_lpm() will retrieve the configuration data
for a specific path.
The function is meant to be called with the device already enabled; that is,
at earliest during set_online() processing.
The function may be called enabled or disabled, but the device must not be
locked
int read_conf_data(struct ccw_device, void **buffer, int *length);
int read_conf_data_lpm(struct ccw_device, void **buffer, int *length, __u8 lpm);
cdev - the ccw_device the data is requested for.
buffer - Pointer to a buffer pointer. The read_conf_data() routine
will allocate a buffer and initialize the buffer pointer
accordingly. It's the device driver's responsibility to
release the kernel memory if no longer needed.
length - Length of the buffer allocated and retrieved.
lpm - Logical path mask to be used for retrieving the data. If
zero the data is retrieved on the next path available.
The read_conf_data() function returns :
0 - Successful completion
-ENODEV - cdev invalid.
-EINVAL - An invalid parameter was detected, or the function was called early.
-EIO - An irrecoverable I/O error occurred or the device is
not operational.
-ENOMEM - The read_conf_data() routine couldn't obtain storage.
-EOPNOTSUPP - The device doesn't support the read configuration
data command.
get_ciw() - get command information word
This call enables a device driver to get information about supported commands

28
arch/s390/kernel/compat_wrapper.S
View file

@ -1682,3 +1682,31 @@ compat_sys_utimes_wrapper:
llgtr %r2,%r2 # char *
llgtr %r3,%r3 # struct compat_timeval *
jg compat_sys_utimes
.globl compat_sys_utimensat_wrapper
compat_sys_utimensat_wrapper:
llgfr %r2,%r2 # unsigned int
llgtr %r3,%r3 # char *
llgtr %r4,%r4 # struct compat_timespec *
lgfr %r5,%r5 # int
jg compat_sys_utimensat
.globl compat_sys_signalfd_wrapper
compat_sys_signalfd_wrapper:
lgfr %r2,%r2 # int
llgtr %r3,%r3 # compat_sigset_t *
llgfr %r4,%r4 # compat_size_t
jg compat_sys_signalfd
.globl compat_sys_timerfd_wrapper
compat_sys_timerfd_wrapper:
lgfr %r2,%r2 # int
lgfr %r3,%r3 # int
lgfr %r4,%r4 # int
llgtr %r5,%r5 # struct compat_itimerspec *
jg compat_sys_timerfd
.globl sys_eventfd_wrapper
sys_eventfd_wrapper:
llgfr %r2,%r2 # unsigned int
jg sys_eventfd

2
arch/s390/kernel/kprobes.c
View file

@ -413,7 +413,7 @@ static int __kprobes trampoline_probe_handler(struct kprobe *p,
break;
}
}
BUG_ON(!orig_ret_address || (orig_ret_address == trampoline_address));
kretprobe_assert(ri, orig_ret_address, trampoline_address);
regs->psw.addr = orig_ret_address | PSW_ADDR_AMODE;
reset_current_kprobe();

5
arch/s390/kernel/syscalls.S
View file

@ -322,3 +322,8 @@ NI_SYSCALL /* 310 sys_move_pages */
SYSCALL(sys_getcpu,sys_getcpu,sys_getcpu_wrapper)
SYSCALL(sys_epoll_pwait,sys_epoll_pwait,compat_sys_epoll_pwait_wrapper)
SYSCALL(sys_utimes,sys_utimes,compat_sys_utimes_wrapper)
NI_SYSCALL /* 314 sys_fallocate */
SYSCALL(sys_utimensat,sys_utimensat,compat_sys_utimensat_wrapper) /* 315 */
SYSCALL(sys_signalfd,sys_signalfd,compat_sys_signalfd_wrapper)
SYSCALL(sys_timerfd,sys_timerfd,compat_sys_timerfd_wrapper)
SYSCALL(sys_eventfd,sys_eventfd,sys_eventfd_wrapper)

38
arch/s390/mm/init.c
View file

@ -61,30 +61,38 @@ void diag10(unsigned long addr)
void show_mem(void)
{
int i, total = 0, reserved = 0;
int shared = 0, cached = 0;
int i, total = 0, reserved = 0;
int shared = 0, cached = 0;
struct page *page;
printk("Mem-info:\n");
show_free_areas();
printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
i = max_mapnr;
while (i-- > 0) {
printk("Mem-info:\n");
show_free_areas();
printk("Free swap: %6ldkB\n", nr_swap_pages << (PAGE_SHIFT - 10));
i = max_mapnr;
while (i-- > 0) {
if (!pfn_valid(i))
continue;
page = pfn_to_page(i);
total++;
total++;
if (PageReserved(page))
reserved++;
reserved++;
else if (PageSwapCache(page))
cached++;
cached++;
else if (page_count(page))
shared += page_count(page) - 1;
}
printk("%d pages of RAM\n",total);
printk("%d reserved pages\n",reserved);
printk("%d pages shared\n",shared);
printk("%d pages swap cached\n",cached);
}
printk("%d pages of RAM\n", total);
printk("%d reserved pages\n", reserved);
printk("%d pages shared\n", shared);
printk("%d pages swap cached\n", cached);
printk("%lu pages dirty\n", global_page_state(NR_FILE_DIRTY));
printk("%lu pages writeback\n", global_page_state(NR_WRITEBACK));
printk("%lu pages mapped\n", global_page_state(NR_FILE_MAPPED));
printk("%lu pages slab\n",
global_page_state(NR_SLAB_RECLAIMABLE) +
global_page_state(NR_SLAB_UNRECLAIMABLE));
printk("%lu pages pagetables\n", global_page_state(NR_PAGETABLE));
}
static void __init setup_ro_region(void)

21
include/asm-s390/unistd.h
View file

@ -251,8 +251,12 @@
#define __NR_getcpu 311
#define __NR_epoll_pwait 312
#define __NR_utimes 313
#define NR_syscalls 314
/* Number 314 is reserved for new sys_fallocate */
#define __NR_utimensat 315
#define __NR_signalfd 316
#define __NR_timerfd 317
#define __NR_eventfd 318
#define NR_syscalls 319
/*
* There are some system calls that are not present on 64 bit, some
@ -346,6 +350,19 @@
#ifdef __KERNEL__
#ifndef CONFIG_64BIT
#define __IGNORE_select
#else
#define __IGNORE_time
#endif
/* Ignore NUMA system calls. Not wired up on s390. */
#define __IGNORE_mbind
#define __IGNORE_get_mempolicy
#define __IGNORE_set_mempolicy
#define __IGNORE_migrate_pages
#define __IGNORE_move_pages
#define __ARCH_WANT_IPC_PARSE_VERSION
#define __ARCH_WANT_OLD_READDIR
#define __ARCH_WANT_SYS_ALARM