Merge tag 'powerpc-4.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman: "Highlights include: - Larger virtual address space on 64-bit server CPUs. By default we use a 128TB virtual address space, but a process can request access to the full 512TB by passing a hint to mmap(). - Support for the new Power9 "XIVE" interrupt controller. - TLB flushing optimisations for the radix MMU on Power9. - Support for CAPI cards on Power9, using the "Coherent Accelerator Interface Architecture 2.0". - The ability to configure the mmap randomisation limits at build and runtime. - Several small fixes and cleanups to the kprobes code, as well as support for KPROBES_ON_FTRACE. - Major improvements to handling of system reset interrupts, correctly treating them as NMIs, giving them a dedicated stack and using a new hypervisor call to trigger them, all of which should aid debugging and robustness. - Many fixes and other minor enhancements. Thanks to: Alastair D'Silva, Alexey Kardashevskiy, Alistair Popple, Andrew Donnellan, Aneesh Kumar K.V, Anshuman Khandual, Anton Blanchard, Balbir Singh, Ben Hutchings, Benjamin Herrenschmidt, Bhupesh Sharma, Chris Packham, Christian Zigotzky, Christophe Leroy, Christophe Lombard, Daniel Axtens, David Gibson, Gautham R. Shenoy, Gavin Shan, Geert Uytterhoeven, Guilherme G. Piccoli, Hamish Martin, Hari Bathini, Kees Cook, Laurent Dufour, Madhavan Srinivasan, Mahesh J Salgaonkar, Mahesh Salgaonkar, Masami Hiramatsu, Matt Brown, Matthew R. Ochs, Michael Neuling, Naveen N. Rao, Nicholas Piggin, Oliver O'Halloran, Pan Xinhui, Paul Mackerras, Rashmica Gupta, Russell Currey, Sukadev Bhattiprolu, Thadeu Lima de Souza Cascardo, Tobin C. Harding, Tyrel Datwyler, Uma Krishnan, Vaibhav Jain, Vipin K Parashar, Yang Shi" * tag 'powerpc-4.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (214 commits) powerpc/64s: Power9 has no LPCR[VRMASD] field so don't set it powerpc/powernv: Fix TCE kill on NVLink2 powerpc/mm/radix: Drop support for CPUs without lockless tlbie powerpc/book3s/mce: Move add_taint() later in virtual mode powerpc/sysfs: Move #ifdef CONFIG_HOTPLUG_CPU out of the function body powerpc/smp: Document irq enable/disable after migrating IRQs powerpc/mpc52xx: Don't select user-visible RTAS_PROC powerpc/powernv: Document cxl dependency on special case in pnv_eeh_reset() powerpc/eeh: Clean up and document event handling functions powerpc/eeh: Avoid use after free in eeh_handle_special_event() cxl: Mask slice error interrupts after first occurrence cxl: Route eeh events to all drivers in cxl_pci_error_detected() cxl: Force context lock during EEH flow powerpc/64: Allow CONFIG_RELOCATABLE if COMPILE_TEST powerpc/xmon: Teach xmon oops about radix vectors powerpc/mm/hash: Fix off-by-one in comment about kernel contexts ids powerpc/pseries: Enable VFIO powerpc/powernv: Fix iommu table size calculation hook for small tables powerpc/powernv: Check kzalloc() return value in pnv_pci_table_alloc powerpc: Add arch/powerpc/tools directory ...
author: Linus Torvalds <torvalds@linux-foundation.org> 2017-05-05 11:36:44 -0700
committer: Linus Torvalds <torvalds@linux-foundation.org> 2017-05-05 11:36:44 -0700
commit: 7246f60068840847bdcf595be5f0b5ca632736e0 (patch)
tree: fd9a963a03c2655f3ba9d1ced3c87a2775f5b166 /arch/powerpc/kernel/idle_book3s.S
parent: e579dde654fc2c6b0d3e4b77a9a4b2d2405c510e (diff)
parent: 700b7eadd5625d22b8235fb21259b3d7d564c000 (diff)
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linux-7246f60068840847bdcf595be5f0b5ca632736e0.tar.bz2
linux-7246f60068840847bdcf595be5f0b5ca632736e0.zip
1 files changed, 225 insertions, 60 deletions
diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S
index 6fd08219248d..07d4e0ad60db 100644
--- a/arch/powerpc/kernel/idle_book3s.S
+++ b/arch/powerpc/kernel/idle_book3s.S
@@ -20,6 +20,7 @@
 #include <asm/kvm_book3s_asm.h>
 #include <asm/opal.h>
 #include <asm/cpuidle.h>
+#include <asm/exception-64s.h>
 #include <asm/book3s/64/mmu-hash.h>
 #include <asm/mmu.h>
 
@@ -94,12 +95,12 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)
 core_idle_lock_held:
 	HMT_LOW
 3:	lwz	r15,0(r14)
-	andi.   r15,r15,PNV_CORE_IDLE_LOCK_BIT
+	andis.	r15,r15,PNV_CORE_IDLE_LOCK_BIT@h
 	bne	3b
 	HMT_MEDIUM
 	lwarx	r15,0,r14
-	andi.	r9,r15,PNV_CORE_IDLE_LOCK_BIT
-	bne	core_idle_lock_held
+	andis.	r9,r15,PNV_CORE_IDLE_LOCK_BIT@h
+	bne-	core_idle_lock_held
 	blr
 
 /*
@@ -113,7 +114,7 @@ core_idle_lock_held:
  *
  * Address to 'rfid' to in r5
  */
-_GLOBAL(pnv_powersave_common)
+pnv_powersave_common:
 	/* Use r3 to pass state nap/sleep/winkle */
 	/* NAP is a state loss, we create a regs frame on the
 	 * stack, fill it up with the state we care about and
@@ -188,8 +189,8 @@ pnv_enter_arch207_idle_mode:
 	/* The following store to HSTATE_HWTHREAD_STATE(r13)  */
 	/* MUST occur in real mode, i.e. with the MMU off,    */
 	/* and the MMU must stay off until we clear this flag */
-	/* and test HSTATE_HWTHREAD_REQ(r13) in the system    */
-	/* reset interrupt vector in exceptions-64s.S.        */
+	/* and test HSTATE_HWTHREAD_REQ(r13) in               */
+	/* pnv_powersave_wakeup in this file.                 */
 	/* The reason is that another thread can switch the   */
 	/* MMU to a guest context whenever this flag is set   */
 	/* to KVM_HWTHREAD_IN_IDLE, and if the MMU was on,    */
@@ -209,15 +210,20 @@ pnv_enter_arch207_idle_mode:
 	/* Sleep or winkle */
 	lbz	r7,PACA_THREAD_MASK(r13)
 	ld	r14,PACA_CORE_IDLE_STATE_PTR(r13)
+	li	r5,0
+	beq	cr3,3f
+	lis	r5,PNV_CORE_IDLE_WINKLE_COUNT@h
+3:
 lwarx_loop1:
 	lwarx	r15,0,r14
 
-	andi.   r9,r15,PNV_CORE_IDLE_LOCK_BIT
-	bnel	core_idle_lock_held
+	andis.	r9,r15,PNV_CORE_IDLE_LOCK_BIT@h
+	bnel-	core_idle_lock_held
 
+	add	r15,r15,r5			/* Add if winkle */
 	andc	r15,r15,r7			/* Clear thread bit */
 
-	andi.	r15,r15,PNV_CORE_IDLE_THREAD_BITS
+	andi.	r9,r15,PNV_CORE_IDLE_THREAD_BITS
 
 /*
  * If cr0 = 0, then current thread is the last thread of the core entering
@@ -240,7 +246,7 @@ common_enter: /* common code for all the threads entering sleep or winkle */
 	IDLE_STATE_ENTER_SEQ_NORET(PPC_SLEEP)
 
 fastsleep_workaround_at_entry:
-	ori	r15,r15,PNV_CORE_IDLE_LOCK_BIT
+	oris	r15,r15,PNV_CORE_IDLE_LOCK_BIT@h
 	stwcx.	r15,0,r14
 	bne-	lwarx_loop1
 	isync
@@ -250,10 +256,10 @@ fastsleep_workaround_at_entry:
 	li	r4,1
 	bl	opal_config_cpu_idle_state
 
-	/* Clear Lock bit */
-	li	r0,0
+	/* Unlock */
+	xoris	r15,r15,PNV_CORE_IDLE_LOCK_BIT@h
 	lwsync
-	stw	r0,0(r14)
+	stw	r15,0(r14)
 	b	common_enter
 
 enter_winkle:
@@ -301,8 +307,8 @@ power_enter_stop:
 
 lwarx_loop_stop:
 	lwarx   r15,0,r14
-	andi.   r9,r15,PNV_CORE_IDLE_LOCK_BIT
-	bnel    core_idle_lock_held
+	andis.	r9,r15,PNV_CORE_IDLE_LOCK_BIT@h
+	bnel-	core_idle_lock_held
 	andc    r15,r15,r7                      /* Clear thread bit */
 
 	stwcx.  r15,0,r14
@@ -375,17 +381,113 @@ _GLOBAL(power9_idle_stop)
 	li	r4,1
 	b	pnv_powersave_common
 	/* No return */
+
 /*
- * Called from reset vector. Check whether we have woken up with
- * hypervisor state loss. If yes, restore hypervisor state and return
- * back to reset vector.
+ * On waking up from stop 0,1,2 with ESL=1 on POWER9 DD1,
+ * HSPRG0 will be set to the HSPRG0 value of one of the
+ * threads in this core. Thus the value we have in r13
+ * may not be this thread's paca pointer.
+ *
+ * Fortunately, the TIR remains invariant. Since this thread's
+ * paca pointer is recorded in all its sibling's paca, we can
+ * correctly recover this thread's paca pointer if we
+ * know the index of this thread in the core.
+ *
+ * This index can be obtained from the TIR.
  *
- * r13 - Contents of HSPRG0
+ * i.e, thread's position in the core = TIR.
+ * If this value is i, then this thread's paca is
+ * paca->thread_sibling_pacas[i].
+ */
+power9_dd1_recover_paca:
+	mfspr	r4, SPRN_TIR
+	/*
+	 * Since each entry in thread_sibling_pacas is 8 bytes
+	 * we need to left-shift by 3 bits. Thus r4 = i * 8
+	 */
+	sldi	r4, r4, 3
+	/* Get &paca->thread_sibling_pacas[0] in r5 */
+	ld	r5, PACA_SIBLING_PACA_PTRS(r13)
+	/* Load paca->thread_sibling_pacas[i] into r13 */
+	ldx	r13, r4, r5
+	SET_PACA(r13)
+	/*
+	 * Indicate that we have lost NVGPR state
+	 * which needs to be restored from the stack.
+	 */
+	li	r3, 1
+	stb	r0,PACA_NAPSTATELOST(r13)
+	blr
+
+/*
+ * Called from machine check handler for powersave wakeups.
+ * Low level machine check processing has already been done. Now just
+ * go through the wake up path to get everything in order.
+ *
+ * r3 - The original SRR1 value.
+ * Original SRR[01] have been clobbered.
+ * MSR_RI is clear.
+ */
+.global pnv_powersave_wakeup_mce
+pnv_powersave_wakeup_mce:
+	/* Set cr3 for pnv_powersave_wakeup */
+	rlwinm	r11,r3,47-31,30,31
+	cmpwi	cr3,r11,2
+
+	/*
+	 * Now put the original SRR1 with SRR1_WAKEMCE_RESVD as the wake
+	 * reason into SRR1, which allows reuse of the system reset wakeup
+	 * code without being mistaken for another type of wakeup.
+	 */
+	oris	r3,r3,SRR1_WAKEMCE_RESVD@h
+	mtspr	SPRN_SRR1,r3
+
+	b	pnv_powersave_wakeup
+
+/*
+ * Called from reset vector for powersave wakeups.
  * cr3 - set to gt if waking up with partial/complete hypervisor state loss
  */
-_GLOBAL(pnv_restore_hyp_resource)
+.global pnv_powersave_wakeup
+pnv_powersave_wakeup:
+	ld	r2, PACATOC(r13)
+
 BEGIN_FTR_SECTION
-	ld	r2,PACATOC(r13);
+BEGIN_FTR_SECTION_NESTED(70)
+	bl	power9_dd1_recover_paca
+END_FTR_SECTION_NESTED_IFSET(CPU_FTR_POWER9_DD1, 70)
+	bl	pnv_restore_hyp_resource_arch300
+FTR_SECTION_ELSE
+	bl	pnv_restore_hyp_resource_arch207
+ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)
+
+	li	r0,PNV_THREAD_RUNNING
+	stb	r0,PACA_THREAD_IDLE_STATE(r13)	/* Clear thread state */
+
+#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
+	li	r0,KVM_HWTHREAD_IN_KERNEL
+	stb	r0,HSTATE_HWTHREAD_STATE(r13)
+	/* Order setting hwthread_state vs. testing hwthread_req */
+	sync
+	lbz	r0,HSTATE_HWTHREAD_REQ(r13)
+	cmpwi	r0,0
+	beq	1f
+	b	kvm_start_guest
+1:
+#endif
+
+	/* Return SRR1 from power7_nap() */
+	mfspr	r3,SPRN_SRR1
+	blt	cr3,pnv_wakeup_noloss
+	b	pnv_wakeup_loss
+
+/*
+ * Check whether we have woken up with hypervisor state loss.
+ * If yes, restore hypervisor state and return back to link.
+ *
+ * cr3 - set to gt if waking up with partial/complete hypervisor state loss
+ */
+pnv_restore_hyp_resource_arch300:
 	/*
 	 * POWER ISA 3. Use PSSCR to determine if we
 	 * are waking up from deep idle state
@@ -400,31 +502,19 @@ BEGIN_FTR_SECTION
 	 */
 	rldicl  r5,r5,4,60
 	cmpd	cr4,r5,r4
-	bge	cr4,pnv_wakeup_tb_loss
-	/*
-	 * Waking up without hypervisor state loss. Return to
-	 * reset vector
-	 */
-	blr
+	bge	cr4,pnv_wakeup_tb_loss /* returns to caller */
 
-END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
+	blr	/* Waking up without hypervisor state loss. */
 
+/* Same calling convention as arch300 */
+pnv_restore_hyp_resource_arch207:
 	/*
 	 * POWER ISA 2.07 or less.
-	 * Check if last bit of HSPGR0 is set. This indicates whether we are
-	 * waking up from winkle.
+	 * Check if we slept with sleep or winkle.
 	 */
-	clrldi	r5,r13,63
-	clrrdi	r13,r13,1
-
-	/* Now that we are sure r13 is corrected, load TOC */
-	ld	r2,PACATOC(r13);
-	cmpwi	cr4,r5,1
-	mtspr	SPRN_HSPRG0,r13
-
-	lbz	r0,PACA_THREAD_IDLE_STATE(r13)
-	cmpwi   cr2,r0,PNV_THREAD_NAP
-	bgt     cr2,pnv_wakeup_tb_loss	/* Either sleep or Winkle */
+	lbz	r4,PACA_THREAD_IDLE_STATE(r13)
+	cmpwi	cr2,r4,PNV_THREAD_NAP
+	bgt	cr2,pnv_wakeup_tb_loss	/* Either sleep or Winkle */
 
 	/*
 	 * We fall through here if PACA_THREAD_IDLE_STATE shows we are waking
@@ -433,8 +523,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
 	 */
 	bgt	cr3,.
 
-	blr	/* Return back to System Reset vector from where
-		   pnv_restore_hyp_resource was invoked */
+	blr	/* Waking up without hypervisor state loss */
 
 /*
  * Called if waking up from idle state which can cause either partial or
@@ -444,9 +533,14 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
  *
  * r13 - PACA
  * cr3 - gt if waking up with partial/complete hypervisor state loss
+ *
+ * If ISA300:
  * cr4 - gt or eq if waking up from complete hypervisor state loss.
+ *
+ * If ISA207:
+ * r4 - PACA_THREAD_IDLE_STATE
  */
-_GLOBAL(pnv_wakeup_tb_loss)
+pnv_wakeup_tb_loss:
 	ld	r1,PACAR1(r13)
 	/*
 	 * Before entering any idle state, the NVGPRs are saved in the stack.
@@ -473,18 +567,19 @@ _GLOBAL(pnv_wakeup_tb_loss)
 	 * is required to return back to reset vector after hypervisor state
 	 * restore is complete.
 	 */
+	mr	r18,r4
 	mflr	r17
 	mfspr	r16,SPRN_SRR1
 BEGIN_FTR_SECTION
 	CHECK_HMI_INTERRUPT
 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
 
-	lbz	r7,PACA_THREAD_MASK(r13)
 	ld	r14,PACA_CORE_IDLE_STATE_PTR(r13)
-lwarx_loop2:
-	lwarx	r15,0,r14
-	andi.	r9,r15,PNV_CORE_IDLE_LOCK_BIT
+	lbz	r7,PACA_THREAD_MASK(r13)
+
 	/*
+	 * Take the core lock to synchronize against other threads.
+	 *
 	 * Lock bit is set in one of the 2 cases-
 	 * a. In the sleep/winkle enter path, the last thread is executing
 	 * fastsleep workaround code.
@@ -492,23 +587,93 @@ lwarx_loop2:
 	 * workaround undo code or resyncing timebase or restoring context
 	 * In either case loop until the lock bit is cleared.
 	 */
-	bnel	core_idle_lock_held
+1:
+	lwarx	r15,0,r14
+	andis.	r9,r15,PNV_CORE_IDLE_LOCK_BIT@h
+	bnel-	core_idle_lock_held
+	oris	r15,r15,PNV_CORE_IDLE_LOCK_BIT@h
+	stwcx.	r15,0,r14
+	bne-	1b
+	isync
 
-	cmpwi	cr2,r15,0
+	andi.	r9,r15,PNV_CORE_IDLE_THREAD_BITS
+	cmpwi	cr2,r9,0
 
 	/*
 	 * At this stage
 	 * cr2 - eq if first thread to wakeup in core
 	 * cr3-  gt if waking up with partial/complete hypervisor state loss
+	 * ISA300:
 	 * cr4 - gt or eq if waking up from complete hypervisor state loss.
 	 */
 
-	ori	r15,r15,PNV_CORE_IDLE_LOCK_BIT
-	stwcx.	r15,0,r14
-	bne-	lwarx_loop2
-	isync
-
 BEGIN_FTR_SECTION
+	/*
+	 * Were we in winkle?
+	 * If yes, check if all threads were in winkle, decrement our
+	 * winkle count, set all thread winkle bits if all were in winkle.
+	 * Check if our thread has a winkle bit set, and set cr4 accordingly
+	 * (to match ISA300, above). Pseudo-code for core idle state
+	 * transitions for ISA207 is as follows (everything happens atomically
+	 * due to store conditional and/or lock bit):
+	 *
+	 * nap_idle() { }
+	 * nap_wake() { }
+	 *
+	 * sleep_idle()
+	 * {
+	 *	core_idle_state &= ~thread_in_core
+	 * }
+	 *
+	 * sleep_wake()
+	 * {
+	 *     bool first_in_core, first_in_subcore;
+	 *
+	 *     first_in_core = (core_idle_state & IDLE_THREAD_BITS) == 0;
+	 *     first_in_subcore = (core_idle_state & SUBCORE_SIBLING_MASK) == 0;
+	 *
+	 *     core_idle_state |= thread_in_core;
+	 * }
+	 *
+	 * winkle_idle()
+	 * {
+	 *	core_idle_state &= ~thread_in_core;
+	 *	core_idle_state += 1 << WINKLE_COUNT_SHIFT;
+	 * }
+	 *
+	 * winkle_wake()
+	 * {
+	 *     bool first_in_core, first_in_subcore, winkle_state_lost;
+	 *
+	 *     first_in_core = (core_idle_state & IDLE_THREAD_BITS) == 0;
+	 *     first_in_subcore = (core_idle_state & SUBCORE_SIBLING_MASK) == 0;
+	 *
+	 *     core_idle_state |= thread_in_core;
+	 *
+	 *     if ((core_idle_state & WINKLE_MASK) == (8 << WINKLE_COUNT_SIHFT))
+	 *         core_idle_state |= THREAD_WINKLE_BITS;
+	 *     core_idle_state -= 1 << WINKLE_COUNT_SHIFT;
+	 *
+	 *     winkle_state_lost = core_idle_state &
+	 *				(thread_in_core << WINKLE_THREAD_SHIFT);
+	 *     core_idle_state &= ~(thread_in_core << WINKLE_THREAD_SHIFT);
+	 * }
+	 *
+	 */
+	cmpwi	r18,PNV_THREAD_WINKLE
+	bne	2f
+	andis.	r9,r15,PNV_CORE_IDLE_WINKLE_COUNT_ALL_BIT@h
+	subis	r15,r15,PNV_CORE_IDLE_WINKLE_COUNT@h
+	beq	2f
+	ori	r15,r15,PNV_CORE_IDLE_THREAD_WINKLE_BITS /* all were winkle */
+2:
+	/* Shift thread bit to winkle mask, then test if this thread is set,
+	 * and remove it from the winkle bits */
+	slwi	r8,r7,8
+	and	r8,r8,r15
+	andc	r15,r15,r8
+	cmpwi	cr4,r8,1 /* cr4 will be gt if our bit is set, lt if not */
+
 	lbz	r4,PACA_SUBCORE_SIBLING_MASK(r13)
 	and	r4,r4,r15
 	cmpwi	r4,0	/* Check if first in subcore */
@@ -593,7 +758,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
 	mtspr	SPRN_WORC,r4
 
 clear_lock:
-	andi.	r15,r15,PNV_CORE_IDLE_THREAD_BITS
+	xoris	r15,r15,PNV_CORE_IDLE_LOCK_BIT@h
 	lwsync
 	stw	r15,0(r14)
 
@@ -651,8 +816,7 @@ hypervisor_state_restored:
 
 	mtspr	SPRN_SRR1,r16
 	mtlr	r17
-	blr	/* Return back to System Reset vector from where
-		   pnv_restore_hyp_resource was invoked */
+	blr		/* return to pnv_powersave_wakeup */
 
 fastsleep_workaround_at_exit:
 	li	r3,1
@@ -664,7 +828,8 @@ fastsleep_workaround_at_exit:
  * R3 here contains the value that will be returned to the caller
  * of power7_nap.
  */
-_GLOBAL(pnv_wakeup_loss)
+.global pnv_wakeup_loss
+pnv_wakeup_loss:
 	ld	r1,PACAR1(r13)
 BEGIN_FTR_SECTION
 	CHECK_HMI_INTERRUPT
@@ -684,7 +849,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
  * R3 here contains the value that will be returned to the caller
  * of power7_nap.
  */
-_GLOBAL(pnv_wakeup_noloss)
+pnv_wakeup_noloss:
 	lbz	r0,PACA_NAPSTATELOST(r13)
 	cmpwi	r0,0
 	bne	pnv_wakeup_loss
author	Linus Torvalds <torvalds@linux-foundation.org>	2017-05-05 11:36:44 -0700
committer	Linus Torvalds <torvalds@linux-foundation.org>	2017-05-05 11:36:44 -0700
commit	7246f60068840847bdcf595be5f0b5ca632736e0 (patch)
tree	fd9a963a03c2655f3ba9d1ced3c87a2775f5b166 /arch/powerpc/kernel/idle_book3s.S
parent	e579dde654fc2c6b0d3e4b77a9a4b2d2405c510e (diff)
parent	700b7eadd5625d22b8235fb21259b3d7d564c000 (diff)
download	linux-7246f60068840847bdcf595be5f0b5ca632736e0.tar.gz linux-7246f60068840847bdcf595be5f0b5ca632736e0.tar.bz2 linux-7246f60068840847bdcf595be5f0b5ca632736e0.zip