Merge tag 'powerpc-4.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman:
 "A bit of a small release, I suspect in part due to me travelling for
  KS. But my backlog of patches to review is smaller than usual, so I
  think in part folks just didn't send as much this cycle.

  Non-highlights:

   - Five fixes for the >128T address space handling, both to fix bugs
     in our implementation and to bring the semantics exactly into line
     with x86.

  Highlights:

   - Support for a new OPAL call on bare metal machines which gives us a
     true NMI (ie. is not masked by MSR[EE]=0) for debugging etc.

   - Support for Power9 DD2 in the CXL driver.

   - Improvements to machine check handling so that uncorrectable errors
     can be reported into the generic memory_failure() machinery.

   - Some fixes and improvements for VPHN, which is used under PowerVM
     to notify the Linux partition of topology changes.

   - Plumbing to enable TM (transactional memory) without suspend on
     some Power9 processors (PPC_FEATURE2_HTM_NO_SUSPEND).

   - Support for emulating vector loads form cache-inhibited memory, on
     some Power9 revisions.

   - Disable the fast-endian switch "syscall" by default (behind a
     CONFIG), we believe it has never had any users.

   - A major rework of the API drivers use when initiating and waiting
     for long running operations performed by OPAL firmware, and changes
     to the powernv_flash driver to use the new API.

   - Several fixes for the handling of FP/VMX/VSX while processes are
     using transactional memory.

   - Optimisations of TLB range flushes when using the radix MMU on
     Power9.

   - Improvements to the VAS facility used to access coprocessors on
     Power9, and related improvements to the way the NX crypto driver
     handles requests.

   - Implementation of PMEM_API and UACCESS_FLUSHCACHE for 64-bit.

  Thanks to: Alexey Kardashevskiy, Alistair Popple, Allen Pais, Andrew
  Donnellan, Aneesh Kumar K.V, Arnd Bergmann, Balbir Singh, Benjamin
  Herrenschmidt, Breno Leitao, Christophe Leroy, Christophe Lombard,
  Cyril Bur, Frederic Barrat, Gautham R. Shenoy, Geert Uytterhoeven,
  Guilherme G. Piccoli, Gustavo Romero, Haren Myneni, Joel Stanley,
  Kamalesh Babulal, Kautuk Consul, Markus Elfring, Masami Hiramatsu,
  Michael Bringmann, Michael Neuling, Michal Suchanek, Naveen N. Rao,
  Nicholas Piggin, Oliver O'Halloran, Paul Mackerras, Pedro Miraglia
  Franco de Carvalho, Philippe Bergheaud, Sandipan Das, Seth Forshee,
  Shriya, Stephen Rothwell, Stewart Smith, Sukadev Bhattiprolu, Tyrel
  Datwyler, Vaibhav Jain, Vaidyanathan Srinivasan, and William A.
  Kennington III"

* tag 'powerpc-4.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (151 commits)
  powerpc/64s: Fix Power9 DD2.0 workarounds by adding DD2.1 feature
  powerpc/64s: Fix masking of SRR1 bits on instruction fault
  powerpc/64s: mm_context.addr_limit is only used on hash
  powerpc/64s/radix: Fix 128TB-512TB virtual address boundary case allocation
  powerpc/64s/hash: Allow MAP_FIXED allocations to cross 128TB boundary
  powerpc/64s/hash: Fix fork() with 512TB process address space
  powerpc/64s/hash: Fix 128TB-512TB virtual address boundary case allocation
  powerpc/64s/hash: Fix 512T hint detection to use >= 128T
  powerpc: Fix DABR match on hash based systems
  powerpc/signal: Properly handle return value from uprobe_deny_signal()
  powerpc/fadump: use kstrtoint to handle sysfs store
  powerpc/lib: Implement UACCESS_FLUSHCACHE API
  powerpc/lib: Implement PMEM API
  powerpc/powernv/npu: Don't explicitly flush nmmu tlb
  powerpc/powernv/npu: Use flush_all_mm() instead of flush_tlb_mm()
  powerpc/powernv/idle: Round up latency and residency values
  powerpc/kprobes: refactor kprobe_lookup_name for safer string operations
  powerpc/kprobes: Blacklist emulate_update_regs() from kprobes
  powerpc/kprobes: Do not disable interrupts for optprobes and kprobes_on_ftrace
  powerpc/kprobes: Disable preemption before invoking probe handler for optprobes
  ...

1 files changed, 17 insertions, 42 deletions

diff --git a/arch/powerpc/kernel/tm.S b/arch/powerpc/kernel/tm.S
index 1da12f521cb7..b92ac8e711db 100644
--- a/arch/powerpc/kernel/tm.S
+++ b/arch/powerpc/kernel/tm.S
@@ -80,15 +80,12 @@ _GLOBAL(tm_abort)
 	blr
 
 /* void tm_reclaim(struct thread_struct *thread,
- *                 unsigned long orig_msr,
  *		   uint8_t cause)
  *
  *	- Performs a full reclaim.  This destroys outstanding
  *	  transactions and updates thread->regs.tm_ckpt_* with the
  *	  original checkpointed state.  Note that thread->regs is
  *	  unchanged.
- *	- FP regs are written back to thread->transact_fpr before
- *	  reclaiming.  These are the transactional (current) versions.
  *
  * Purpose is to both abort transactions of, and preserve the state of,
  * a transactions at a context switch. We preserve/restore both sets of process
@@ -99,9 +96,9 @@ _GLOBAL(tm_abort)
  * Call with IRQs off, stacks get all out of sync for some periods in here!
  */
 _GLOBAL(tm_reclaim)
-	mfcr	r6
+	mfcr	r5
 	mflr	r0
-	stw	r6, 8(r1)
+	stw	r5, 8(r1)
 	std	r0, 16(r1)
 	std	r2, STK_GOT(r1)
 	stdu	r1, -TM_FRAME_SIZE(r1)
@@ -109,7 +106,6 @@ _GLOBAL(tm_reclaim)
 	/* We've a struct pt_regs at [r1+STACK_FRAME_OVERHEAD]. */
 
 	std	r3, STK_PARAM(R3)(r1)
-	std	r4, STK_PARAM(R4)(r1)
 	SAVE_NVGPRS(r1)
 
 	/* We need to setup MSR for VSX register save instructions. */
@@ -139,8 +135,8 @@ _GLOBAL(tm_reclaim)
 	std	r1, PACAR1(r13)
 
 	/* Clear MSR RI since we are about to change r1, EE is already off. */
-	li	r4, 0
-	mtmsrd	r4, 1
+	li	r5, 0
+	mtmsrd	r5, 1
 
 	/*
 	 * BE CAREFUL HERE:
@@ -152,7 +148,7 @@ _GLOBAL(tm_reclaim)
 	 * to user register state.  (FPRs, CCR etc. also!)
 	 * Use an sprg and a tm_scratch in the PACA to shuffle.
 	 */
-	TRECLAIM(R5)				/* Cause in r5 */
+	TRECLAIM(R4)				/* Cause in r4 */
 
 	/* ******************** GPRs ******************** */
 	/* Stash the checkpointed r13 away in the scratch SPR and get the real
@@ -243,40 +239,30 @@ _GLOBAL(tm_reclaim)
 
 
 	/* ******************** FPR/VR/VSRs ************
-	 * After reclaiming, capture the checkpointed FPRs/VRs /if used/.
-	 *
-	 * (If VSX used, FP and VMX are implied.  Or, we don't need to look
-	 * at MSR.VSX as copying FP regs if .FP, vector regs if .VMX covers it.)
-	 *
-	 * We're passed the thread's MSR as the second parameter
+	 * After reclaiming, capture the checkpointed FPRs/VRs.
 	 *
 	 * We enabled VEC/FP/VSX in the msr above, so we can execute these
 	 * instructions!
 	 */
-	ld	r4, STK_PARAM(R4)(r1)		/* Second parameter, MSR * */
 	mr	r3, r12
-	andis.		r0, r4, MSR_VEC@h
-	beq	dont_backup_vec
 
+	/* Altivec (VEC/VMX/VR)*/
 	addi	r7, r3, THREAD_CKVRSTATE
 	SAVE_32VRS(0, r6, r7)	/* r6 scratch, r7 transact vr state */
 	mfvscr	v0
 	li	r6, VRSTATE_VSCR
 	stvx	v0, r7, r6
-dont_backup_vec:
+
+	/* VRSAVE */
 	mfspr	r0, SPRN_VRSAVE
 	std	r0, THREAD_CKVRSAVE(r3)
 
-	andi.	r0, r4, MSR_FP
-	beq	dont_backup_fp
-
+	/* Floating Point (FP) */
 	addi	r7, r3, THREAD_CKFPSTATE
 	SAVE_32FPRS_VSRS(0, R6, R7)	/* r6 scratch, r7 transact fp state */
-
 	mffs    fr0
 	stfd    fr0,FPSTATE_FPSCR(r7)
 
-dont_backup_fp:
 
 	/* TM regs, incl TEXASR -- these live in thread_struct.  Note they've
 	 * been updated by the treclaim, to explain to userland the failure
@@ -344,22 +330,19 @@ _GLOBAL(__tm_recheckpoint)
 	 */
 	subi	r7, r7, STACK_FRAME_OVERHEAD
 
+	/* We need to setup MSR for FP/VMX/VSX register save instructions. */
 	mfmsr	r6
-	/* R4 = original MSR to indicate whether thread used FP/Vector etc. */
-
-	/* Enable FP/vec in MSR if necessary! */
-	lis	r5, MSR_VEC@h
+	mr	r5, r6
 	ori	r5, r5, MSR_FP
-	and.	r5, r4, r5
-	beq	restore_gprs			/* if neither, skip both */
-
+#ifdef CONFIG_ALTIVEC
+	oris	r5, r5, MSR_VEC@h
+#endif
 #ifdef CONFIG_VSX
 	BEGIN_FTR_SECTION
-	oris	r5, r5, MSR_VSX@h
+	oris	r5,r5, MSR_VSX@h
 	END_FTR_SECTION_IFSET(CPU_FTR_VSX)
 #endif
-	or	r5, r6, r5			/* Set MSR.FP+.VSX/.VEC */
-	mtmsr	r5
+	mtmsrd	r5
 
 #ifdef CONFIG_ALTIVEC
 	/*
@@ -368,28 +351,20 @@ _GLOBAL(__tm_recheckpoint)
 	 * thread.fp_state[] version holds the 'live' (transactional)
 	 * and will be loaded subsequently by any FPUnavailable trap.
 	 */
-	andis.	r0, r4, MSR_VEC@h
-	beq	dont_restore_vec
-
 	addi	r8, r3, THREAD_CKVRSTATE
 	li	r5, VRSTATE_VSCR
 	lvx	v0, r8, r5
 	mtvscr	v0
 	REST_32VRS(0, r5, r8)			/* r5 scratch, r8 ptr */
-dont_restore_vec:
 	ld	r5, THREAD_CKVRSAVE(r3)
 	mtspr	SPRN_VRSAVE, r5
 #endif
 
-	andi.	r0, r4, MSR_FP
-	beq	dont_restore_fp
-
 	addi	r8, r3, THREAD_CKFPSTATE
 	lfd	fr0, FPSTATE_FPSCR(r8)
 	MTFSF_L(fr0)
 	REST_32FPRS_VSRS(0, R4, R8)
 
-dont_restore_fp:
 	mtmsr	r6				/* FP/Vec off again! */
 
 restore_gprs: