Merge tag 's390-5.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Vasily Gorbik:

 - Add support for ftrace with direct call and ftrace direct call
   samples.

 - Add support for kernel command lines longer than current 896 bytes
   and make its length configurable.

 - Add support for BEAR enhancement facility to improve last breaking
   event instruction tracking.

 - Add kprobes sanity checks and testcases to prevent kprobe in the mid
   of an instruction.

 - Allow concurrent access to /dev/hwc for the CPUMF users.

 - Various ftrace / jump label improvements.

 - Convert unwinder tests to KUnit.

 - Add s390_iommu_aperture kernel parameter to tweak the limits on
   concurrently usable DMA mappings.

 - Add ap.useirq AP module option which can be used to disable interrupt
   use.

 - Add add_disk() error handling support to block device drivers.

 - Drop arch specific and use generic implementation of strlcpy and
   strrchr.

 - Several __pa/__va usages fixes.

 - Various cio, crypto, pci, kernel doc and other small fixes and
   improvements all over the code.

[ Merge fixup as per https://lore.kernel.org/all/YXAqZ%2FEszRisunQw@osiris/ ]

* tag 's390-5.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (63 commits)
  s390: make command line configurable
  s390: support command lines longer than 896 bytes
  s390/kexec_file: move kernel image size check
  s390/pci: add s390_iommu_aperture kernel parameter
  s390/spinlock: remove incorrect kernel doc indicator
  s390/string: use generic strlcpy
  s390/string: use generic strrchr
  s390/ap: function rework based on compiler warning
  s390/cio: make ccw_device_dma_* more robust
  s390/vfio-ap: s390/crypto: fix all kernel-doc warnings
  s390/hmcdrv: fix kernel doc comments
  s390/ap: new module option ap.useirq
  s390/cpumf: Allow multiple processes to access /dev/hwc
  s390/bitops: return true/false (not 1/0) from bool functions
  s390: add support for BEAR enhancement facility
  s390: introduce nospec_uses_trampoline()
  s390: rename last_break to pgm_last_break
  s390/ptrace: add last_break member to pt_regs
  s390/sclp: sort out physical vs virtual pointers usage
  s390/setup: convert start and end initrd pointers to virtual
  ...

1 files changed, 46 insertions, 18 deletions

diff --git a/arch/s390/kernel/mcount.S b/arch/s390/kernel/mcount.S
index 6b13797143a7..39bcc0e39a10 100644
--- a/arch/s390/kernel/mcount.S
+++ b/arch/s390/kernel/mcount.S
@@ -22,10 +22,11 @@ ENTRY(ftrace_stub)
 	BR_EX	%r14
 ENDPROC(ftrace_stub)
 
-#define STACK_FRAME_SIZE  (STACK_FRAME_OVERHEAD + __PT_SIZE)
-#define STACK_PTREGS	  (STACK_FRAME_OVERHEAD)
-#define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS)
-#define STACK_PTREGS_PSW  (STACK_PTREGS + __PT_PSW)
+#define STACK_FRAME_SIZE	(STACK_FRAME_OVERHEAD + __PT_SIZE)
+#define STACK_PTREGS		(STACK_FRAME_OVERHEAD)
+#define STACK_PTREGS_GPRS	(STACK_PTREGS + __PT_GPRS)
+#define STACK_PTREGS_PSW	(STACK_PTREGS + __PT_PSW)
+#define STACK_PTREGS_ORIG_GPR2	(STACK_PTREGS + __PT_ORIG_GPR2)
 #ifdef __PACK_STACK
 /* allocate just enough for r14, r15 and backchain */
 #define TRACED_FUNC_FRAME_SIZE	24
@@ -33,13 +34,15 @@ ENDPROC(ftrace_stub)
 #define TRACED_FUNC_FRAME_SIZE	STACK_FRAME_OVERHEAD
 #endif
 
-ENTRY(ftrace_caller)
-	.globl	ftrace_regs_caller
-	.set	ftrace_regs_caller,ftrace_caller
+	.macro	ftrace_regs_entry, allregs=0
 	stg	%r14,(__SF_GPRS+8*8)(%r15)	# save traced function caller
+
+	.if \allregs == 1
 	lghi	%r14,0				# save condition code
 	ipm	%r14				# don't put any instructions
 	sllg	%r14,%r14,16			# clobbering CC before this point
+	.endif
+
 	lgr	%r1,%r15
 	# allocate stack frame for ftrace_caller to contain traced function
 	aghi	%r15,-TRACED_FUNC_FRAME_SIZE
@@ -49,13 +52,31 @@ ENTRY(ftrace_caller)
 	# allocate pt_regs and stack frame for ftrace_trace_function
 	aghi	%r15,-STACK_FRAME_SIZE
 	stg	%r1,(STACK_PTREGS_GPRS+15*8)(%r15)
+	xc	STACK_PTREGS_ORIG_GPR2(8,%r15),STACK_PTREGS_ORIG_GPR2(%r15)
+
+	.if \allregs == 1
 	stg	%r14,(STACK_PTREGS_PSW)(%r15)
-	lg	%r14,(__SF_GPRS+8*8)(%r1)	# restore original return address
 	stosm	(STACK_PTREGS_PSW)(%r15),0
+	.endif
+
+	lg	%r14,(__SF_GPRS+8*8)(%r1)	# restore original return address
 	aghi	%r1,-TRACED_FUNC_FRAME_SIZE
 	stg	%r1,__SF_BACKCHAIN(%r15)
 	stg	%r0,(STACK_PTREGS_PSW+8)(%r15)
 	stmg	%r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
+	.endm
+
+SYM_CODE_START(ftrace_regs_caller)
+	ftrace_regs_entry	1
+	j	ftrace_common
+SYM_CODE_END(ftrace_regs_caller)
+
+SYM_CODE_START(ftrace_caller)
+	ftrace_regs_entry	0
+	j	ftrace_common
+SYM_CODE_END(ftrace_caller)
+
+SYM_CODE_START(ftrace_common)
 #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
 	aghik	%r2,%r0,-MCOUNT_INSN_SIZE
 	lgrl	%r4,function_trace_op
@@ -74,24 +95,31 @@ ENTRY(ftrace_caller)
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 # The j instruction gets runtime patched to a nop instruction.
 # See ftrace_enable_ftrace_graph_caller.
-	.globl ftrace_graph_caller
-ftrace_graph_caller:
-	j	ftrace_graph_caller_end
+SYM_INNER_LABEL(ftrace_graph_caller, SYM_L_GLOBAL)
+	j	.Lftrace_graph_caller_end
 	lmg	%r2,%r3,(STACK_PTREGS_GPRS+14*8)(%r15)
 	lg	%r4,(STACK_PTREGS_PSW+8)(%r15)
 	brasl	%r14,prepare_ftrace_return
 	stg	%r2,(STACK_PTREGS_GPRS+14*8)(%r15)
-ftrace_graph_caller_end:
-	.globl	ftrace_graph_caller_end
+.Lftrace_graph_caller_end:
+#endif
+	lg	%r0,(STACK_PTREGS_PSW+8)(%r15)
+#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
+	ltg	%r1,STACK_PTREGS_ORIG_GPR2(%r15)
+	locgrz	%r1,%r0
+#else
+	lg	%r1,STACK_PTREGS_ORIG_GPR2(%r15)
+	ltgr	%r1,%r1
+	jnz	0f
+	lgr	%r1,%r0
 #endif
-	lg	%r1,(STACK_PTREGS_PSW+8)(%r15)
-	lmg	%r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
+0:	lmg	%r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
 	BR_EX	%r1
-ENDPROC(ftrace_caller)
+SYM_CODE_END(ftrace_common)
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 
-ENTRY(return_to_handler)
+SYM_FUNC_START(return_to_handler)
 	stmg	%r2,%r5,32(%r15)
 	lgr	%r1,%r15
 	aghi	%r15,-STACK_FRAME_OVERHEAD
@@ -101,6 +129,6 @@ ENTRY(return_to_handler)
 	lgr	%r14,%r2
 	lmg	%r2,%r5,32(%r15)
 	BR_EX	%r14
-ENDPROC(return_to_handler)
+SYM_FUNC_END(return_to_handler)
 
 #endif