diff options
| -rw-r--r-- | Documentation/powerpc/transactional_memory.txt | 32 | ||||
| -rw-r--r-- | arch/powerpc/include/uapi/asm/tm.h | 2 | ||||
| -rw-r--r-- | arch/powerpc/kernel/eeh.c | 11 | ||||
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 19 | ||||
| -rw-r--r-- | arch/powerpc/kernel/idle_power7.S | 2 | ||||
| -rw-r--r-- | arch/powerpc/kvm/book3s_xics.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/pci-ioda.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/dlpar.c | 10 | ||||
| -rw-r--r-- | tools/testing/selftests/powerpc/pmu/Makefile | 2 | ||||
| -rw-r--r-- | tools/testing/selftests/powerpc/tm/Makefile | 2 |
10 files changed, 37 insertions, 47 deletions
diff --git a/Documentation/powerpc/transactional_memory.txt b/Documentation/powerpc/transactional_memory.txt index ba0a2a4a54ba..ded69794a5c0 100644 --- a/Documentation/powerpc/transactional_memory.txt +++ b/Documentation/powerpc/transactional_memory.txt @@ -74,23 +74,22 @@ Causes of transaction aborts Syscalls ======== -Syscalls made from within an active transaction will not be performed and the -transaction will be doomed by the kernel with the failure code TM_CAUSE_SYSCALL -| TM_CAUSE_PERSISTENT. +Performing syscalls from within transaction is not recommended, and can lead +to unpredictable results. -Syscalls made from within a suspended transaction are performed as normal and -the transaction is not explicitly doomed by the kernel. However, what the -kernel does to perform the syscall may result in the transaction being doomed -by the hardware. The syscall is performed in suspended mode so any side -effects will be persistent, independent of transaction success or failure. No -guarantees are provided by the kernel about which syscalls will affect -transaction success. +Syscalls do not by design abort transactions, but beware: The kernel code will +not be running in transactional state. The effect of syscalls will always +remain visible, but depending on the call they may abort your transaction as a +side-effect, read soon-to-be-aborted transactional data that should not remain +invisible, etc. If you constantly retry a transaction that constantly aborts +itself by calling a syscall, you'll have a livelock & make no progress. -Care must be taken when relying on syscalls to abort during active transactions -if the calls are made via a library. Libraries may cache values (which may -give the appearance of success) or perform operations that cause transaction -failure before entering the kernel (which may produce different failure codes). -Examples are glibc's getpid() and lazy symbol resolution. +Simple syscalls (e.g. sigprocmask()) "could" be OK. Even things like write() +from, say, printf() should be OK as long as the kernel does not access any +memory that was accessed transactionally. + +Consider any syscalls that happen to work as debug-only -- not recommended for +production use. Best to queue them up till after the transaction is over. Signals @@ -177,7 +176,8 @@ kernel aborted a transaction: TM_CAUSE_RESCHED Thread was rescheduled. TM_CAUSE_TLBI Software TLB invalid. TM_CAUSE_FAC_UNAV FP/VEC/VSX unavailable trap. - TM_CAUSE_SYSCALL Syscall from active transaction. + TM_CAUSE_SYSCALL Currently unused; future syscalls that must abort + transactions for consistency will use this. TM_CAUSE_SIGNAL Signal delivered. TM_CAUSE_MISC Currently unused. TM_CAUSE_ALIGNMENT Alignment fault. diff --git a/arch/powerpc/include/uapi/asm/tm.h b/arch/powerpc/include/uapi/asm/tm.h index 5047659815a5..5d836b7c1176 100644 --- a/arch/powerpc/include/uapi/asm/tm.h +++ b/arch/powerpc/include/uapi/asm/tm.h @@ -11,7 +11,7 @@ #define TM_CAUSE_RESCHED 0xde #define TM_CAUSE_TLBI 0xdc #define TM_CAUSE_FAC_UNAV 0xda -#define TM_CAUSE_SYSCALL 0xd8 +#define TM_CAUSE_SYSCALL 0xd8 /* future use */ #define TM_CAUSE_MISC 0xd6 /* future use */ #define TM_CAUSE_SIGNAL 0xd4 #define TM_CAUSE_ALIGNMENT 0xd2 diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c index 44b480e3a5af..9ee61d15653d 100644 --- a/arch/powerpc/kernel/eeh.c +++ b/arch/powerpc/kernel/eeh.c @@ -749,21 +749,24 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state stat eeh_unfreeze_pe(pe, false); eeh_pe_state_clear(pe, EEH_PE_CFG_BLOCKED); eeh_pe_dev_traverse(pe, eeh_restore_dev_state, dev); + eeh_pe_state_clear(pe, EEH_PE_ISOLATED); break; case pcie_hot_reset: + eeh_pe_state_mark(pe, EEH_PE_ISOLATED); eeh_ops->set_option(pe, EEH_OPT_FREEZE_PE); eeh_pe_dev_traverse(pe, eeh_disable_and_save_dev_state, dev); eeh_pe_state_mark(pe, EEH_PE_CFG_BLOCKED); eeh_ops->reset(pe, EEH_RESET_HOT); break; case pcie_warm_reset: + eeh_pe_state_mark(pe, EEH_PE_ISOLATED); eeh_ops->set_option(pe, EEH_OPT_FREEZE_PE); eeh_pe_dev_traverse(pe, eeh_disable_and_save_dev_state, dev); eeh_pe_state_mark(pe, EEH_PE_CFG_BLOCKED); eeh_ops->reset(pe, EEH_RESET_FUNDAMENTAL); break; default: - eeh_pe_state_clear(pe, EEH_PE_CFG_BLOCKED); + eeh_pe_state_clear(pe, EEH_PE_ISOLATED | EEH_PE_CFG_BLOCKED); return -EINVAL; }; @@ -1058,6 +1061,9 @@ void eeh_add_device_early(struct pci_dn *pdn) if (!edev || !eeh_enabled()) return; + if (!eeh_has_flag(EEH_PROBE_MODE_DEVTREE)) + return; + /* USB Bus children of PCI devices will not have BUID's */ phb = edev->phb; if (NULL == phb || @@ -1112,6 +1118,9 @@ void eeh_add_device_late(struct pci_dev *dev) return; } + if (eeh_has_flag(EEH_PROBE_MODE_DEV)) + eeh_ops->probe(pdn, NULL); + /* * The EEH cache might not be removed correctly because of * unbalanced kref to the device during unplug time, which diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 8ca9434c40e6..afbc20019c2e 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -34,7 +34,6 @@ #include <asm/ftrace.h> #include <asm/hw_irq.h> #include <asm/context_tracking.h> -#include <asm/tm.h> /* * System calls. @@ -146,24 +145,6 @@ END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR) andi. r11,r10,_TIF_SYSCALL_DOTRACE bne syscall_dotrace .Lsyscall_dotrace_cont: -#ifdef CONFIG_PPC_TRANSACTIONAL_MEM -BEGIN_FTR_SECTION - b 1f -END_FTR_SECTION_IFCLR(CPU_FTR_TM) - extrdi. r11, r12, 1, (63-MSR_TS_T_LG) /* transaction active? */ - beq+ 1f - - /* Doom the transaction and don't perform the syscall: */ - mfmsr r11 - li r12, 1 - rldimi r11, r12, MSR_TM_LG, 63-MSR_TM_LG - mtmsrd r11, 0 - li r11, (TM_CAUSE_SYSCALL|TM_CAUSE_PERSISTENT) - TABORT(R11) - - b .Lsyscall_exit -1: -#endif cmpldi 0,r0,NR_syscalls bge- syscall_enosys diff --git a/arch/powerpc/kernel/idle_power7.S b/arch/powerpc/kernel/idle_power7.S index eeaa0d5f69d5..ccde8f084ce4 100644 --- a/arch/powerpc/kernel/idle_power7.S +++ b/arch/powerpc/kernel/idle_power7.S @@ -501,9 +501,11 @@ BEGIN_FTR_SECTION CHECK_HMI_INTERRUPT END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) ld r1,PACAR1(r13) + ld r6,_CCR(r1) ld r4,_MSR(r1) ld r5,_NIP(r1) addi r1,r1,INT_FRAME_SIZE + mtcr r6 mtspr SPRN_SRR1,r4 mtspr SPRN_SRR0,r5 rfid diff --git a/arch/powerpc/kvm/book3s_xics.c b/arch/powerpc/kvm/book3s_xics.c index 8f3e6cc54d95..c6ca7db64673 100644 --- a/arch/powerpc/kvm/book3s_xics.c +++ b/arch/powerpc/kvm/book3s_xics.c @@ -12,6 +12,7 @@ #include <linux/err.h> #include <linux/gfp.h> #include <linux/anon_inodes.h> +#include <linux/spinlock.h> #include <asm/uaccess.h> #include <asm/kvm_book3s.h> @@ -20,7 +21,6 @@ #include <asm/xics.h> #include <asm/debug.h> #include <asm/time.h> -#include <asm/spinlock.h> #include <linux/debugfs.h> #include <linux/seq_file.h> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index 920c252d1f49..f8bc950efcae 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -2693,7 +2693,6 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np, hose->last_busno = 0xff; } hose->private_data = phb; - hose->controller_ops = pnv_pci_controller_ops; phb->hub_id = hub_id; phb->opal_id = phb_id; phb->type = ioda_type; @@ -2812,6 +2811,7 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np, pnv_pci_controller_ops.enable_device_hook = pnv_pci_enable_device_hook; pnv_pci_controller_ops.window_alignment = pnv_pci_window_alignment; pnv_pci_controller_ops.reset_secondary_bus = pnv_pci_reset_secondary_bus; + hose->controller_ops = pnv_pci_controller_ops; #ifdef CONFIG_PCI_IOV ppc_md.pcibios_fixup_sriov = pnv_pci_ioda_fixup_iov_resources; diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c index b4b11096ea8b..019d34aaf054 100644 --- a/arch/powerpc/platforms/pseries/dlpar.c +++ b/arch/powerpc/platforms/pseries/dlpar.c @@ -412,6 +412,10 @@ static ssize_t dlpar_cpu_probe(const char *buf, size_t count) if (rc) return -EINVAL; + rc = dlpar_acquire_drc(drc_index); + if (rc) + return -EINVAL; + parent = of_find_node_by_path("/cpus"); if (!parent) return -ENODEV; @@ -422,12 +426,6 @@ static ssize_t dlpar_cpu_probe(const char *buf, size_t count) of_node_put(parent); - rc = dlpar_acquire_drc(drc_index); - if (rc) { - dlpar_free_cc_nodes(dn); - return -EINVAL; - } - rc = dlpar_attach_node(dn); if (rc) { dlpar_release_drc(drc_index); diff --git a/tools/testing/selftests/powerpc/pmu/Makefile b/tools/testing/selftests/powerpc/pmu/Makefile index 5a161175bbd4..a9099d9f8f39 100644 --- a/tools/testing/selftests/powerpc/pmu/Makefile +++ b/tools/testing/selftests/powerpc/pmu/Makefile @@ -26,7 +26,7 @@ override define EMIT_TESTS $(MAKE) -s -C ebb emit_tests endef -DEFAULT_INSTALL := $(INSTALL_RULE) +DEFAULT_INSTALL_RULE := $(INSTALL_RULE) override define INSTALL_RULE $(DEFAULT_INSTALL_RULE) $(MAKE) -C ebb install diff --git a/tools/testing/selftests/powerpc/tm/Makefile b/tools/testing/selftests/powerpc/tm/Makefile index 1b616fa79e93..6bff955e1d55 100644 --- a/tools/testing/selftests/powerpc/tm/Makefile +++ b/tools/testing/selftests/powerpc/tm/Makefile @@ -1,4 +1,4 @@ -TEST_PROGS := tm-resched-dscr tm-syscall +TEST_PROGS := tm-resched-dscr all: $(TEST_PROGS) |