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
  ...

1 files changed, 195 insertions, 46 deletions

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 16321ad9e70c..f11f65634aab 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -29,7 +29,9 @@
 #include <linux/nmi.h>
 #include <linux/ctype.h>
 
+#include <asm/debugfs.h>
 #include <asm/ptrace.h>
+#include <asm/smp.h>
 #include <asm/string.h>
 #include <asm/prom.h>
 #include <asm/machdep.h>
@@ -48,7 +50,7 @@
 #include <asm/reg.h>
 #include <asm/debug.h>
 #include <asm/hw_breakpoint.h>
-
+#include <asm/xive.h>
 #include <asm/opal.h>
 #include <asm/firmware.h>
 
@@ -76,6 +78,7 @@ static int xmon_gate;
 #endif /* CONFIG_SMP */
 
 static unsigned long in_xmon __read_mostly = 0;
+static int xmon_on = IS_ENABLED(CONFIG_XMON_DEFAULT);
 
 static unsigned long adrs;
 static int size = 1;
@@ -184,8 +187,6 @@ static void dump_tlb_44x(void);
 static void dump_tlb_book3e(void);
 #endif
 
-static int xmon_no_auto_backtrace;
-
 #ifdef CONFIG_PPC64
 #define REG		"%.16lx"
 #else
@@ -232,7 +233,13 @@ Commands:\n\
   "\
   dr	dump stream of raw bytes\n\
   dt	dump the tracing buffers (uses printk)\n\
-  e	print exception information\n\
+"
+#ifdef CONFIG_PPC_POWERNV
+"  dx#   dump xive on CPU #\n\
+  dxi#  dump xive irq state #\n\
+  dxa   dump xive on all CPUs\n"
+#endif
+"  e	print exception information\n\
   f	flush cache\n\
   la	lookup symbol+offset of specified address\n\
   ls	lookup address of specified symbol\n\
@@ -411,7 +418,22 @@ int cpus_are_in_xmon(void)
 {
 	return !cpumask_empty(&cpus_in_xmon);
 }
-#endif
+
+static bool wait_for_other_cpus(int ncpus)
+{
+	unsigned long timeout;
+
+	/* We wait for 2s, which is a metric "little while" */
+	for (timeout = 20000; timeout != 0; --timeout) {
+		if (cpumask_weight(&cpus_in_xmon) >= ncpus)
+			return true;
+		udelay(100);
+		barrier();
+	}
+
+	return false;
+}
+#endif /* CONFIG_SMP */
 
 static inline int unrecoverable_excp(struct pt_regs *regs)
 {
@@ -433,7 +455,6 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
 #ifdef CONFIG_SMP
 	int cpu;
 	int secondary;
-	unsigned long timeout;
 #endif
 
 	local_irq_save(flags);
@@ -520,13 +541,17 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
 		xmon_owner = cpu;
 		mb();
 		if (ncpus > 1) {
-			smp_send_debugger_break();
-			/* wait for other cpus to come in */
-			for (timeout = 100000000; timeout != 0; --timeout) {
-				if (cpumask_weight(&cpus_in_xmon) >= ncpus)
-					break;
-				barrier();
-			}
+			/*
+			 * A system reset (trap == 0x100) can be triggered on
+			 * all CPUs, so when we come in via 0x100 try waiting
+			 * for the other CPUs to come in before we send the
+			 * debugger break (IPI). This is similar to
+			 * crash_kexec_secondary().
+			 */
+			if (TRAP(regs) != 0x100 || !wait_for_other_cpus(ncpus))
+				smp_send_debugger_break();
+
+			wait_for_other_cpus(ncpus);
 		}
 		remove_bpts();
 		disable_surveillance();
@@ -884,10 +909,7 @@ cmds(struct pt_regs *excp)
 	last_cmd = NULL;
 	xmon_regs = excp;
 
-	if (!xmon_no_auto_backtrace) {
-		xmon_no_auto_backtrace = 1;
-		xmon_show_stack(excp->gpr[1], excp->link, excp->nip);
-	}
+	xmon_show_stack(excp->gpr[1], excp->link, excp->nip);
 
 	for(;;) {
 #ifdef CONFIG_SMP
@@ -1347,9 +1369,19 @@ const char *getvecname(unsigned long vec)
 	case 0x100:	ret = "(System Reset)"; break;
 	case 0x200:	ret = "(Machine Check)"; break;
 	case 0x300:	ret = "(Data Access)"; break;
-	case 0x380:	ret = "(Data SLB Access)"; break;
+	case 0x380:
+		if (radix_enabled())
+			ret = "(Data Access Out of Range)";
+		else
+			ret = "(Data SLB Access)";
+		break;
 	case 0x400:	ret = "(Instruction Access)"; break;
-	case 0x480:	ret = "(Instruction SLB Access)"; break;
+	case 0x480:
+		if (radix_enabled())
+			ret = "(Instruction Access Out of Range)";
+		else
+			ret = "(Instruction SLB Access)";
+		break;
 	case 0x500:	ret = "(Hardware Interrupt)"; break;
 	case 0x600:	ret = "(Alignment)"; break;
 	case 0x700:	ret = "(Program Check)"; break;
@@ -2231,7 +2263,9 @@ static void dump_one_paca(int cpu)
 	DUMP(p, kernel_msr, "lx");
 	DUMP(p, emergency_sp, "p");
 #ifdef CONFIG_PPC_BOOK3S_64
+	DUMP(p, nmi_emergency_sp, "p");
 	DUMP(p, mc_emergency_sp, "p");
+	DUMP(p, in_nmi, "x");
 	DUMP(p, in_mce, "x");
 	DUMP(p, hmi_event_available, "x");
 #endif
@@ -2338,6 +2372,81 @@ static void dump_pacas(void)
 }
 #endif
 
+#ifdef CONFIG_PPC_POWERNV
+static void dump_one_xive(int cpu)
+{
+	unsigned int hwid = get_hard_smp_processor_id(cpu);
+
+	opal_xive_dump(XIVE_DUMP_TM_HYP, hwid);
+	opal_xive_dump(XIVE_DUMP_TM_POOL, hwid);
+	opal_xive_dump(XIVE_DUMP_TM_OS, hwid);
+	opal_xive_dump(XIVE_DUMP_TM_USER, hwid);
+	opal_xive_dump(XIVE_DUMP_VP, hwid);
+	opal_xive_dump(XIVE_DUMP_EMU_STATE, hwid);
+
+	if (setjmp(bus_error_jmp) != 0) {
+		catch_memory_errors = 0;
+		printf("*** Error dumping xive on cpu %d\n", cpu);
+		return;
+	}
+
+	catch_memory_errors = 1;
+	sync();
+	xmon_xive_do_dump(cpu);
+	sync();
+	__delay(200);
+	catch_memory_errors = 0;
+}
+
+static void dump_all_xives(void)
+{
+	int cpu;
+
+	if (num_possible_cpus() == 0) {
+		printf("No possible cpus, use 'dx #' to dump individual cpus\n");
+		return;
+	}
+
+	for_each_possible_cpu(cpu)
+		dump_one_xive(cpu);
+}
+
+static void dump_one_xive_irq(u32 num)
+{
+	s64 rc;
+	__be64 vp;
+	u8 prio;
+	__be32 lirq;
+
+	rc = opal_xive_get_irq_config(num, &vp, &prio, &lirq);
+	xmon_printf("IRQ 0x%x config: vp=0x%llx prio=%d lirq=0x%x (rc=%lld)\n",
+		    num, be64_to_cpu(vp), prio, be32_to_cpu(lirq), rc);
+}
+
+static void dump_xives(void)
+{
+	unsigned long num;
+	int c;
+
+	c = inchar();
+	if (c == 'a') {
+		dump_all_xives();
+		return;
+	} else if (c == 'i') {
+		if (scanhex(&num))
+			dump_one_xive_irq(num);
+		return;
+	}
+
+	termch = c;	/* Put c back, it wasn't 'a' */
+
+	if (scanhex(&num))
+		dump_one_xive(num);
+	else
+		dump_one_xive(xmon_owner);
+}
+#endif /* CONFIG_PPC_POWERNV */
+
 static void dump_by_size(unsigned long addr, long count, int size)
 {
 	unsigned char temp[16];
@@ -2386,6 +2495,14 @@ dump(void)
 		return;
 	}
 #endif
+#ifdef CONFIG_PPC_POWERNV
+	if (c == 'x') {
+		xmon_start_pagination();
+		dump_xives();
+		xmon_end_pagination();
+		return;
+	}
+#endif
 
 	if (c == '\n')
 		termch = c;
@@ -3070,23 +3187,28 @@ void dump_segments(void)
 	for (i = 0; i < mmu_slb_size; i++) {
 		asm volatile("slbmfee  %0,%1" : "=r" (esid) : "r" (i));
 		asm volatile("slbmfev  %0,%1" : "=r" (vsid) : "r" (i));
-		if (esid || vsid) {
-			printf("%02d %016lx %016lx", i, esid, vsid);
-			if (esid & SLB_ESID_V) {
-				llp = vsid & SLB_VSID_LLP;
-				if (vsid & SLB_VSID_B_1T) {
-					printf("  1T  ESID=%9lx  VSID=%13lx LLP:%3lx \n",
-						GET_ESID_1T(esid),
-						(vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T,
-						llp);
-				} else {
-					printf(" 256M ESID=%9lx  VSID=%13lx LLP:%3lx \n",
-						GET_ESID(esid),
-						(vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT,
-						llp);
-				}
-			} else
-				printf("\n");
+
+		if (!esid && !vsid)
+			continue;
+
+		printf("%02d %016lx %016lx", i, esid, vsid);
+
+		if (!(esid & SLB_ESID_V)) {
+			printf("\n");
+			continue;
+		}
+
+		llp = vsid & SLB_VSID_LLP;
+		if (vsid & SLB_VSID_B_1T) {
+			printf("  1T  ESID=%9lx  VSID=%13lx LLP:%3lx \n",
+				GET_ESID_1T(esid),
+				(vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T,
+				llp);
+		} else {
+			printf(" 256M ESID=%9lx  VSID=%13lx LLP:%3lx \n",
+				GET_ESID(esid),
+				(vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT,
+				llp);
 		}
 	}
 }
@@ -3302,6 +3424,8 @@ static void sysrq_handle_xmon(int key)
 	/* ensure xmon is enabled */
 	xmon_init(1);
 	debugger(get_irq_regs());
+	if (!xmon_on)
+		xmon_init(0);
 }
 
 static struct sysrq_key_op sysrq_xmon_op = {
@@ -3315,10 +3439,37 @@ static int __init setup_xmon_sysrq(void)
 	register_sysrq_key('x', &sysrq_xmon_op);
 	return 0;
 }
-__initcall(setup_xmon_sysrq);
+device_initcall(setup_xmon_sysrq);
 #endif /* CONFIG_MAGIC_SYSRQ */
 
-static int __initdata xmon_early, xmon_off;
+#ifdef CONFIG_DEBUG_FS
+static int xmon_dbgfs_set(void *data, u64 val)
+{
+	xmon_on = !!val;
+	xmon_init(xmon_on);
+
+	return 0;
+}
+
+static int xmon_dbgfs_get(void *data, u64 *val)
+{
+	*val = xmon_on;
+	return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(xmon_dbgfs_ops, xmon_dbgfs_get,
+			xmon_dbgfs_set, "%llu\n");
+
+static int __init setup_xmon_dbgfs(void)
+{
+	debugfs_create_file("xmon", 0600, powerpc_debugfs_root, NULL,
+				&xmon_dbgfs_ops);
+	return 0;
+}
+device_initcall(setup_xmon_dbgfs);
+#endif /* CONFIG_DEBUG_FS */
+
+static int xmon_early __initdata;
 
 static int __init early_parse_xmon(char *p)
 {
@@ -3326,12 +3477,12 @@ static int __init early_parse_xmon(char *p)
 		/* just "xmon" is equivalent to "xmon=early" */
 		xmon_init(1);
 		xmon_early = 1;
-	} else if (strncmp(p, "on", 2) == 0)
+		xmon_on = 1;
+	} else if (strncmp(p, "on", 2) == 0) {
 		xmon_init(1);
-	else if (strncmp(p, "off", 3) == 0)
-		xmon_off = 1;
-	else if (strncmp(p, "nobt", 4) == 0)
-		xmon_no_auto_backtrace = 1;
+		xmon_on = 1;
+	} else if (strncmp(p, "off", 3) == 0)
+		xmon_on = 0;
 	else
 		return 1;
 
@@ -3341,10 +3492,8 @@ early_param("xmon", early_parse_xmon);
 
 void __init xmon_setup(void)
 {
-#ifdef CONFIG_XMON_DEFAULT
-	if (!xmon_off)
+	if (xmon_on)
 		xmon_init(1);
-#endif
 	if (xmon_early)
 		debugger(NULL);
 }