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Date: Wed, 14 Sep 2005 17:55:09 +0200
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
To: akpm@osdl.org, heiko.carstens@de.ibm.com, linux-kernel@vger.kernel.org
Subject: [patch 6/7] s390: ipl device.
Message-ID: <20050914155509.GE11478@skybase.boeblingen.de.ibm.com>
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[patch 6/7] s390: ipl device.

From: Heiko Carstens <heiko.carstens@de.ibm.com>

Export the ipl device settings to userspace via the sysfs:
 * /sys/kernel/ipl_device
   Contains a string in on of the following formats:
   1) "ccw <bus_id>", or 2) "fcp <bus_id>,<wwpn>,<lun>".
 * /sys/kernel/ipl_parameter
   is a binary interface that exports the ipl  parameter block for
   scsi ipl. For non-scsi ipl the ipl_paramter is irrelevant.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diffstat:
 arch/s390/kernel/head.S   |   72 ++++++++++++++++++++++++++++++++++++++++++----
 arch/s390/kernel/head64.S |   66 ++++++++++++++++++++++++++++++++++++++++--
 arch/s390/kernel/setup.c  |   67 ++++++++++++++++++++++++++++++++++++++++++
 include/asm-s390/setup.h  |   44 ++++++++++++++++++++++++++++
 4 files changed, 242 insertions(+), 7 deletions(-)

diff -urpN linux-2.6/arch/s390/kernel/head64.S linux-2.6-patched/arch/s390/kernel/head64.S
--- linux-2.6/arch/s390/kernel/head64.S	2005-09-14 16:47:51.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/head64.S	2005-09-14 16:48:18.000000000 +0200
@@ -484,6 +484,8 @@ start:
 startup:basr  %r13,0                     # get base
 .LPG1:  sll   %r13,1                     # remove high order bit
         srl   %r13,1
+	l     %r1,.Lget_ipl_device_addr-.LPG1(%r13)
+	basr  %r14,%r1
         lhi   %r1,1                      # mode 1 = esame
         slr   %r0,%r0                    # set cpuid to zero
         sigp  %r1,%r0,0x12               # switch to esame mode
@@ -556,6 +558,9 @@ startup:basr  %r13,0                    
 	mlgr  %r2,%r1			# mem size in bytes in %r3
 	b     .Lfchunk-.LPG1(%r13)
 
+	.align 4
+.Lget_ipl_device_addr:
+	.long .Lget_ipl_device
 .Lpmask:
 	.byte 0
 	.align 8
@@ -746,6 +751,63 @@ _pstart:
 	.global _pend
 _pend:	
 
+.Lget_ipl_device:
+	basr  %r12,0
+.LPG2:	l     %r1,0xb8			# get sid
+	sll   %r1,15			# test if subchannel is enabled
+	srl   %r1,31
+	ltr   %r1,%r1
+	bz    0(%r14)			# subchannel disabled
+	l     %r1,0xb8
+	la    %r5,.Lipl_schib-.LPG2(%r12)
+	stsch 0(%r5)		        # get schib of subchannel
+	bnz   0(%r14)			# schib not available
+	tm    5(%r5),0x01		# devno valid?
+	bno   0(%r14)
+	la    %r6,ipl_parameter_flags-.LPG2(%r12)
+	oi    3(%r6),0x01		# set flag
+	la    %r2,ipl_devno-.LPG2(%r12)
+	mvc   0(2,%r2),6(%r5)		# store devno
+	tm    4(%r5),0x80		# qdio capable device?
+	bno   0(%r14)
+	oi    3(%r6),0x02		# set flag
+
+	# copy ipl parameters
+
+	lhi   %r0,4096
+	l     %r2,20(%r0)		# get address of parameter list
+	lhi   %r3,IPL_PARMBLOCK_ORIGIN
+	st    %r3,20(%r0)
+	lhi   %r4,1
+	cr    %r2,%r3			# start parameters < destination ?
+	jl    0f
+	lhi   %r1,1			# copy direction is upwards
+	j     1f
+0:	lhi   %r1,-1			# copy direction is downwards
+	ar    %r2,%r0
+	ar    %r3,%r0
+	ar    %r2,%r1
+	ar    %r3,%r1
+1:	mvc   0(1,%r3),0(%r2)		# finally copy ipl parameters
+	ar    %r3,%r1
+	ar    %r2,%r1
+	sr    %r0,%r4
+	jne   1b
+	b     0(%r14)
+
+	.align 4
+.Lipl_schib:
+	.rept 13
+	.long 0
+	.endr
+
+	.globl ipl_parameter_flags
+ipl_parameter_flags:
+	.long 0
+	.globl ipl_devno
+ipl_devno:
+	.word 0
+
 #ifdef CONFIG_SHARED_KERNEL
 	.org   0x100000
 #endif
@@ -755,7 +817,7 @@ _pend:	
 #
         .globl _stext
 _stext:	basr  %r13,0                    # get base
-.LPG2:
+.LPG3:
 #
 # Setup stack
 #
@@ -774,7 +836,7 @@ _stext:	basr  %r13,0                    
         lctlg  %c0,%c15,0(%r15)
 
 #
-        lam    0,15,.Laregs-.LPG2(%r13) # load access regs needed by uaccess
+        lam    0,15,.Laregs-.LPG3(%r13) # load access regs needed by uaccess
         brasl  %r14,start_kernel        # go to C code
 #
 # We returned from start_kernel ?!? PANIK
diff -urpN linux-2.6/arch/s390/kernel/head.S linux-2.6-patched/arch/s390/kernel/head.S
--- linux-2.6/arch/s390/kernel/head.S	2005-09-14 16:47:51.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/head.S	2005-09-14 16:48:18.000000000 +0200
@@ -485,7 +485,9 @@ start:
 #
         .org  0x10000
 startup:basr  %r13,0                     # get base
-.LPG1:  lctl  %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
+.LPG1:	l     %r1, .Lget_ipl_device_addr-.LPG1(%r13)
+	basr  %r14, %r1
+	lctl  %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
 	la    %r12,_pstart-.LPG1(%r13)   # pointer to parameter area
 					 # move IPL device to lowcore
         mvc   __LC_IPLDEV(4),IPL_DEVICE-PARMAREA(%r12)
@@ -560,6 +562,9 @@ startup:basr  %r13,0                    
 	mr    %r2,%r1			# mem size in bytes in %r3
 	b     .Lfchunk-.LPG1(%r13)
 
+	.align 4
+.Lget_ipl_device_addr:
+	.long .Lget_ipl_device
 .Lpmask:
 	.byte 0
 .align 8
@@ -755,6 +760,63 @@ _pstart:	
 	.global _pend
 _pend:	
 
+.Lget_ipl_device:
+	basr  %r12,0
+.LPG2:	l     %r1,0xb8			# get sid
+	sll   %r1,15			# test if subchannel is enabled
+	srl   %r1,31
+	ltr   %r1,%r1
+	bz    0(%r14)			# subchannel disabled
+	l     %r1,0xb8
+	la    %r5,.Lipl_schib-.LPG2(%r12)
+	stsch 0(%r5)		        # get schib of subchannel
+	bnz   0(%r14)			# schib not available
+	tm    5(%r5),0x01		# devno valid?
+	bno   0(%r14)
+	la    %r6,ipl_parameter_flags-.LPG2(%r12)
+	oi    3(%r6),0x01		# set flag
+	la    %r2,ipl_devno-.LPG2(%r12)
+	mvc   0(2,%r2),6(%r5)		# store devno
+	tm    4(%r5),0x80		# qdio capable device?
+	bno   0(%r14)
+	oi    3(%r6),0x02		# set flag
+
+	# copy ipl parameters
+
+	lhi   %r0,4096
+	l     %r2,20(%r0)		# get address of parameter list
+	lhi   %r3,IPL_PARMBLOCK_ORIGIN
+	st    %r3,20(%r0)
+	lhi   %r4,1
+	cr    %r2,%r3			# start parameters < destination ?
+	jl    0f
+	lhi   %r1,1			# copy direction is upwards
+	j     1f
+0:	lhi   %r1,-1			# copy direction is downwards
+	ar    %r2,%r0
+	ar    %r3,%r0
+	ar    %r2,%r1
+	ar    %r3,%r1
+1:	mvc   0(1,%r3),0(%r2)		# finally copy ipl parameters
+	ar    %r3,%r1
+	ar    %r2,%r1
+	sr    %r0,%r4
+	jne   1b
+	b     0(%r14)
+
+	.align 4
+.Lipl_schib:
+	.rept 13
+	.long 0
+	.endr
+
+	.globl ipl_parameter_flags
+ipl_parameter_flags:
+	.long 0
+	.globl ipl_devno
+ipl_devno:
+	.word 0
+
 #ifdef CONFIG_SHARED_KERNEL
 	.org   0x100000
 #endif
@@ -764,11 +826,11 @@ _pend:	
 #
         .globl _stext
 _stext:	basr  %r13,0                    # get base
-.LPG2:
+.LPG3:
 #
 # Setup stack
 #
-        l     %r15,.Linittu-.LPG2(%r13)
+        l     %r15,.Linittu-.LPG3(%r13)
 	mvc   __LC_CURRENT(4),__TI_task(%r15)
         ahi   %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE
         st    %r15,__LC_KERNEL_STACK    # set end of kernel stack
@@ -782,8 +844,8 @@ _stext:	basr  %r13,0                    
         lctl   %c0,%c15,0(%r15)
 
 #
-        lam    0,15,.Laregs-.LPG2(%r13) # load access regs needed by uaccess
-        l      %r14,.Lstart-.LPG2(%r13)
+        lam    0,15,.Laregs-.LPG3(%r13) # load access regs needed by uaccess
+        l      %r14,.Lstart-.LPG3(%r13)
         basr   %r14,%r14                # call start_kernel
 #
 # We returned from start_kernel ?!? PANIK
diff -urpN linux-2.6/arch/s390/kernel/setup.c linux-2.6-patched/arch/s390/kernel/setup.c
--- linux-2.6/arch/s390/kernel/setup.c	2005-09-14 16:48:18.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/setup.c	2005-09-14 16:48:18.000000000 +0200
@@ -682,3 +682,70 @@ struct seq_operations cpuinfo_op = {
 	.show	= show_cpuinfo,
 };
 
+#ifdef CONFIG_SYSFS
+
+static ssize_t
+ipl_parameter_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
+{
+	unsigned int size;
+
+	if (!IPL_PARMBLOCK_VALID)
+		return 0;
+
+	size = IPL_PARMBLOCK_SIZE;
+
+	if (off > size)
+		return 0;
+	if (off + count > size)
+		count = size - off;
+
+	memcpy(buf, (void *) IPL_PARMBLOCK_START + off, count);
+	return count;
+}
+
+static struct bin_attribute ipl_parameter_attr = {
+	.attr = {
+		.name = "ipl_parameter",
+		.mode = S_IRUGO,
+		.owner = THIS_MODULE,
+	},
+	.size = PAGE_SIZE,
+	.read = &ipl_parameter_read,
+};
+
+static ssize_t
+ipl_device_show(struct subsystem *subsys, char *page)
+{
+	struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
+
+	if (!IPL_DEVNO_VALID)
+		goto type_unknown;
+	if (!IPL_PARMBLOCK_VALID)
+		goto type_ccw;
+	if (ipl->hdr.header.version > IPL_MAX_SUPPORTED_VERSION)
+		goto type_unknown;
+	if (ipl->fcp.pbt != IPL_TYPE_FCP)
+		goto type_unknown;
+
+	return sprintf(page, "fcp 0.0.%04x,0x%016llx,0x%016llx\n",
+		       ipl->fcp.devno,
+		       (unsigned long long) ipl->fcp.wwpn,
+		       (unsigned long long) ipl->fcp.lun);
+ type_unknown:
+	return sprintf(page, "unknown\n");
+ type_ccw:
+	return sprintf(page, "ccw 0.0.%04x\n",ipl_devno);
+}
+
+static struct subsys_attribute ipl_device_attr = __ATTR_RO(ipl_device);
+
+static int __init
+ipl_device_sysfs_register(void) {
+	sysfs_create_file(&kernel_subsys.kset.kobj, &ipl_device_attr.attr);
+	sysfs_create_bin_file(&kernel_subsys.kset.kobj, &ipl_parameter_attr);
+	return 0;
+}
+
+__initcall(ipl_device_sysfs_register);
+
+#endif /* CONFIG_SYSFS */
diff -urpN linux-2.6/include/asm-s390/setup.h linux-2.6-patched/include/asm-s390/setup.h
--- linux-2.6/include/asm-s390/setup.h	2005-08-29 01:41:01.000000000 +0200
+++ linux-2.6-patched/include/asm-s390/setup.h	2005-09-14 16:48:18.000000000 +0200
@@ -8,11 +8,14 @@
 #ifndef _ASM_S390_SETUP_H
 #define _ASM_S390_SETUP_H
 
+#include <asm/types.h>
+
 #define PARMAREA		0x10400
 #define COMMAND_LINE_SIZE 	896
 #define RAMDISK_ORIGIN		0x800000
 #define RAMDISK_SIZE		0x800000
 #define MEMORY_CHUNKS		16	/* max 0x7fff */
+#define IPL_PARMBLOCK_ORIGIN	0x2000
 
 #ifndef __ASSEMBLY__
 
@@ -64,6 +67,47 @@ extern unsigned int console_irq;
 #define SET_CONSOLE_3215	do { console_mode = 2; } while (0)
 #define SET_CONSOLE_3270	do { console_mode = 3; } while (0)
 
+struct ipl_list_header {
+	u32 length;
+	u8  reserved[3];
+	u8  version;
+} __attribute__((packed));
+
+struct ipl_block_fcp {
+	u32 length;
+	u8  pbt;
+	u8  reserved1[322-1];
+	u16 devno;
+	u8  reserved2[4];
+	u64 wwpn;
+	u64 lun;
+} __attribute__((packed));
+
+struct ipl_parameter_block {
+	union {
+		u32 length;
+		struct ipl_list_header header;
+	} hdr;
+	struct ipl_block_fcp fcp;
+} __attribute__((packed));
+
+#define IPL_MAX_SUPPORTED_VERSION (0)
+
+#define IPL_TYPE_FCP (0)
+
+/*
+ * IPL validity flags and parameters as detected in head.S
+ */
+extern u32 ipl_parameter_flags;
+extern u16 ipl_devno;
+
+#define IPL_DEVNO_VALID		(ipl_parameter_flags & 1)
+#define IPL_PARMBLOCK_VALID	(ipl_parameter_flags & 2)
+
+#define IPL_PARMBLOCK_START	((struct ipl_parameter_block *) \
+				 IPL_PARMBLOCK_ORIGIN)
+#define IPL_PARMBLOCK_SIZE	(IPL_PARMBLOCK_START->hdr.length)
+
 #else 
 
 #ifndef __s390x__
-
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