diff --git a/MAINTAINERS b/MAINTAINERS
index 6d05ae23603679310ba6f0a685e0308c1148d47a..0a2e44ce077aea921c35cd4c45f41b1f085e1bb2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2450,17 +2450,17 @@ F: fs/ecryptfs/
EDAC-CORE
M: Doug Thompson <dougthompson@xmission.com>
-L: bluesmoke-devel@lists.sourceforge.net (moderated for non-subscribers)
+L: linux-edac@vger.kernel.org
W: bluesmoke.sourceforge.net
S: Supported
F: Documentation/edac.txt
-F: drivers/edac/edac_*
+F: drivers/edac/
F: include/linux/edac.h
EDAC-AMD64
M: Doug Thompson <dougthompson@xmission.com>
M: Borislav Petkov <borislav.petkov@amd.com>
-L: bluesmoke-devel@lists.sourceforge.net (moderated for non-subscribers)
+L: linux-edac@vger.kernel.org
W: bluesmoke.sourceforge.net
S: Supported
F: drivers/edac/amd64_edac*
@@ -2468,35 +2468,35 @@ F: drivers/edac/amd64_edac*
EDAC-E752X
M: Mark Gross <mark.gross@intel.com>
M: Doug Thompson <dougthompson@xmission.com>
-L: bluesmoke-devel@lists.sourceforge.net (moderated for non-subscribers)
+L: linux-edac@vger.kernel.org
W: bluesmoke.sourceforge.net
S: Maintained
F: drivers/edac/e752x_edac.c
EDAC-E7XXX
M: Doug Thompson <dougthompson@xmission.com>
-L: bluesmoke-devel@lists.sourceforge.net (moderated for non-subscribers)
+L: linux-edac@vger.kernel.org
W: bluesmoke.sourceforge.net
S: Maintained
F: drivers/edac/e7xxx_edac.c
EDAC-I82443BXGX
M: Tim Small <tim@buttersideup.com>
-L: bluesmoke-devel@lists.sourceforge.net (moderated for non-subscribers)
+L: linux-edac@vger.kernel.org
W: bluesmoke.sourceforge.net
S: Maintained
F: drivers/edac/i82443bxgx_edac.c
EDAC-I3000
M: Jason Uhlenkott <juhlenko@akamai.com>
-L: bluesmoke-devel@lists.sourceforge.net (moderated for non-subscribers)
+L: linux-edac@vger.kernel.org
W: bluesmoke.sourceforge.net
S: Maintained
F: drivers/edac/i3000_edac.c
EDAC-I5000
M: Doug Thompson <dougthompson@xmission.com>
-L: bluesmoke-devel@lists.sourceforge.net (moderated for non-subscribers)
+L: linux-edac@vger.kernel.org
W: bluesmoke.sourceforge.net
S: Maintained
F: drivers/edac/i5000_edac.c
@@ -2525,21 +2525,21 @@ F: drivers/edac/i7core_edac.c
EDAC-I82975X
M: Ranganathan Desikan <ravi@jetztechnologies.com>
M: "Arvind R." <arvino55@gmail.com>
-L: bluesmoke-devel@lists.sourceforge.net (moderated for non-subscribers)
+L: linux-edac@vger.kernel.org
W: bluesmoke.sourceforge.net
S: Maintained
F: drivers/edac/i82975x_edac.c
EDAC-PASEMI
M: Egor Martovetsky <egor@pasemi.com>
-L: bluesmoke-devel@lists.sourceforge.net (moderated for non-subscribers)
+L: linux-edac@vger.kernel.org
W: bluesmoke.sourceforge.net
S: Maintained
F: drivers/edac/pasemi_edac.c
EDAC-R82600
M: Tim Small <tim@buttersideup.com>
-L: bluesmoke-devel@lists.sourceforge.net (moderated for non-subscribers)
+L: linux-edac@vger.kernel.org
W: bluesmoke.sourceforge.net
S: Maintained
F: drivers/edac/r82600_edac.c
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 11270ca22c0a7b880718cd832a3e890f0b69c28f..96033e2d6845cc84a442541fb73f095f8d272f91 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -12,7 +12,7 @@ config TILE
select GENERIC_PENDING_IRQ if SMP
select GENERIC_IRQ_SHOW
select SYS_HYPERVISOR
- select ARCH_HAVE_NMI_SAFE_CMPXCHG if !M386
+ select ARCH_HAVE_NMI_SAFE_CMPXCHG
# FIXME: investigate whether we need/want these options.
# select HAVE_IOREMAP_PROT
@@ -69,6 +69,9 @@ config ARCH_PHYS_ADDR_T_64BIT
config ARCH_DMA_ADDR_T_64BIT
def_bool y
+config NEED_DMA_MAP_STATE
+ def_bool y
+
config LOCKDEP_SUPPORT
def_bool y
@@ -118,7 +121,7 @@ config 64BIT
config ARCH_DEFCONFIG
string
- default "arch/tile/configs/tile_defconfig" if !TILEGX
+ default "arch/tile/configs/tilepro_defconfig" if !TILEGX
default "arch/tile/configs/tilegx_defconfig" if TILEGX
source "init/Kconfig"
@@ -240,6 +243,7 @@ endchoice
config PAGE_OFFSET
hex
+ depends on !64BIT
default 0xF0000000 if VMSPLIT_3_75G
default 0xE0000000 if VMSPLIT_3_5G
default 0xB0000000 if VMSPLIT_2_75G
diff --git a/arch/tile/Makefile b/arch/tile/Makefile
index 17acce70569b01aaf7de554a66c0f7e6e8a47157..9520bc5a4b7f65f9904882185267d797885ab7f5 100644
--- a/arch/tile/Makefile
+++ b/arch/tile/Makefile
@@ -30,7 +30,8 @@ ifneq ($(CONFIG_DEBUG_EXTRA_FLAGS),"")
KBUILD_CFLAGS += $(CONFIG_DEBUG_EXTRA_FLAGS)
endif
-LIBGCC_PATH := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
+LIBGCC_PATH := \
+ $(shell $(CC) $(KBUILD_CFLAGS) $(KCFLAGS) -print-libgcc-file-name)
# Provide the path to use for "make defconfig".
KBUILD_DEFCONFIG := $(ARCH)_defconfig
@@ -53,8 +54,6 @@ libs-y += $(LIBGCC_PATH)
# See arch/tile/Kbuild for content of core part of the kernel
core-y += arch/tile/
-core-$(CONFIG_KVM) += arch/tile/kvm/
-
ifdef TILERA_ROOT
INSTALL_PATH ?= $(TILERA_ROOT)/tile/boot
endif
diff --git a/arch/tile/include/arch/spr_def.h b/arch/tile/include/arch/spr_def.h
index f548efeb2de3f7fc005f90854a80d1b4941e3a98..d6ba449b5363f3318d094ece0f1bf455853da755 100644
--- a/arch/tile/include/arch/spr_def.h
+++ b/arch/tile/include/arch/spr_def.h
@@ -60,8 +60,8 @@
_concat4(SPR_IPI_EVENT_, CONFIG_KERNEL_PL,,)
#define SPR_IPI_EVENT_RESET_K \
_concat4(SPR_IPI_EVENT_RESET_, CONFIG_KERNEL_PL,,)
-#define SPR_IPI_MASK_SET_K \
- _concat4(SPR_IPI_MASK_SET_, CONFIG_KERNEL_PL,,)
+#define SPR_IPI_EVENT_SET_K \
+ _concat4(SPR_IPI_EVENT_SET_, CONFIG_KERNEL_PL,,)
#define INT_IPI_K \
_concat4(INT_IPI_, CONFIG_KERNEL_PL,,)
diff --git a/arch/tile/include/asm/atomic.h b/arch/tile/include/asm/atomic.h
index bb696da5d7cdbdbd4b20d98dedc9d12d53ced994..f2461429a4a4004b474e5024447b4a11200d4fa3 100644
--- a/arch/tile/include/asm/atomic.h
+++ b/arch/tile/include/asm/atomic.h
@@ -17,6 +17,8 @@
#ifndef _ASM_TILE_ATOMIC_H
#define _ASM_TILE_ATOMIC_H
+#include <asm/cmpxchg.h>
+
#ifndef __ASSEMBLY__
#include <linux/compiler.h>
@@ -121,54 +123,6 @@ static inline int atomic_read(const atomic_t *v)
*/
#define atomic_add_negative(i, v) (atomic_add_return((i), (v)) < 0)
-/* Nonexistent functions intended to cause link errors. */
-extern unsigned long __xchg_called_with_bad_pointer(void);
-extern unsigned long __cmpxchg_called_with_bad_pointer(void);
-
-#define xchg(ptr, x) \
- ({ \
- typeof(*(ptr)) __x; \
- switch (sizeof(*(ptr))) { \
- case 4: \
- __x = (typeof(__x))(typeof(__x-__x))atomic_xchg( \
- (atomic_t *)(ptr), \
- (u32)(typeof((x)-(x)))(x)); \
- break; \
- case 8: \
- __x = (typeof(__x))(typeof(__x-__x))atomic64_xchg( \
- (atomic64_t *)(ptr), \
- (u64)(typeof((x)-(x)))(x)); \
- break; \
- default: \
- __xchg_called_with_bad_pointer(); \
- } \
- __x; \
- })
-
-#define cmpxchg(ptr, o, n) \
- ({ \
- typeof(*(ptr)) __x; \
- switch (sizeof(*(ptr))) { \
- case 4: \
- __x = (typeof(__x))(typeof(__x-__x))atomic_cmpxchg( \
- (atomic_t *)(ptr), \
- (u32)(typeof((o)-(o)))(o), \
- (u32)(typeof((n)-(n)))(n)); \
- break; \
- case 8: \
- __x = (typeof(__x))(typeof(__x-__x))atomic64_cmpxchg( \
- (atomic64_t *)(ptr), \
- (u64)(typeof((o)-(o)))(o), \
- (u64)(typeof((n)-(n)))(n)); \
- break; \
- default: \
- __cmpxchg_called_with_bad_pointer(); \
- } \
- __x; \
- })
-
-#define tas(ptr) (xchg((ptr), 1))
-
#endif /* __ASSEMBLY__ */
#ifndef __tilegx__
diff --git a/arch/tile/include/asm/atomic_32.h b/arch/tile/include/asm/atomic_32.h
index 466dc4a39a4faf004d7d7dcabd683d6d41044f40..54d1da826f93dfbf167aaa3c219f143783d91902 100644
--- a/arch/tile/include/asm/atomic_32.h
+++ b/arch/tile/include/asm/atomic_32.h
@@ -200,7 +200,7 @@ static inline u64 atomic64_add_return(u64 i, atomic64_t *v)
* @u: ...unless v is equal to u.
*
* Atomically adds @a to @v, so long as @v was not already @u.
- * Returns the old value of @v.
+ * Returns non-zero if @v was not @u, and zero otherwise.
*/
static inline u64 atomic64_add_unless(atomic64_t *v, u64 a, u64 u)
{
diff --git a/arch/tile/include/asm/bitops_64.h b/arch/tile/include/asm/bitops_64.h
index 58d021a9834f0b12d2b8bc2f091d32a22ca17baf..60b87ee54fb8863eb2387467b76d95117405fb6c 100644
--- a/arch/tile/include/asm/bitops_64.h
+++ b/arch/tile/include/asm/bitops_64.h
@@ -38,10 +38,10 @@ static inline void clear_bit(unsigned nr, volatile unsigned long *addr)
static inline void change_bit(unsigned nr, volatile unsigned long *addr)
{
- unsigned long old, mask = (1UL << (nr % BITS_PER_LONG));
- long guess, oldval;
+ unsigned long mask = (1UL << (nr % BITS_PER_LONG));
+ unsigned long guess, oldval;
addr += nr / BITS_PER_LONG;
- old = *addr;
+ oldval = *addr;
do {
guess = oldval;
oldval = atomic64_cmpxchg((atomic64_t *)addr,
@@ -85,7 +85,7 @@ static inline int test_and_change_bit(unsigned nr,
volatile unsigned long *addr)
{
unsigned long mask = (1UL << (nr % BITS_PER_LONG));
- long guess, oldval = *addr;
+ unsigned long guess, oldval;
addr += nr / BITS_PER_LONG;
oldval = *addr;
do {
diff --git a/arch/tile/include/asm/cmpxchg.h b/arch/tile/include/asm/cmpxchg.h
new file mode 100644
index 0000000000000000000000000000000000000000..276f067e36406e52657f7f0c8f95f9e71cdf28df
--- /dev/null
+++ b/arch/tile/include/asm/cmpxchg.h
@@ -0,0 +1,73 @@
+/*
+ * cmpxchg.h -- forked from asm/atomic.h with this copyright:
+ *
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#ifndef _ASM_TILE_CMPXCHG_H
+#define _ASM_TILE_CMPXCHG_H
+
+#ifndef __ASSEMBLY__
+
+/* Nonexistent functions intended to cause link errors. */
+extern unsigned long __xchg_called_with_bad_pointer(void);
+extern unsigned long __cmpxchg_called_with_bad_pointer(void);
+
+#define xchg(ptr, x) \
+ ({ \
+ typeof(*(ptr)) __x; \
+ switch (sizeof(*(ptr))) { \
+ case 4: \
+ __x = (typeof(__x))(typeof(__x-__x))atomic_xchg( \
+ (atomic_t *)(ptr), \
+ (u32)(typeof((x)-(x)))(x)); \
+ break; \
+ case 8: \
+ __x = (typeof(__x))(typeof(__x-__x))atomic64_xchg( \
+ (atomic64_t *)(ptr), \
+ (u64)(typeof((x)-(x)))(x)); \
+ break; \
+ default: \
+ __xchg_called_with_bad_pointer(); \
+ } \
+ __x; \
+ })
+
+#define cmpxchg(ptr, o, n) \
+ ({ \
+ typeof(*(ptr)) __x; \
+ switch (sizeof(*(ptr))) { \
+ case 4: \
+ __x = (typeof(__x))(typeof(__x-__x))atomic_cmpxchg( \
+ (atomic_t *)(ptr), \
+ (u32)(typeof((o)-(o)))(o), \
+ (u32)(typeof((n)-(n)))(n)); \
+ break; \
+ case 8: \
+ __x = (typeof(__x))(typeof(__x-__x))atomic64_cmpxchg( \
+ (atomic64_t *)(ptr), \
+ (u64)(typeof((o)-(o)))(o), \
+ (u64)(typeof((n)-(n)))(n)); \
+ break; \
+ default: \
+ __cmpxchg_called_with_bad_pointer(); \
+ } \
+ __x; \
+ })
+
+#define tas(ptr) (xchg((ptr), 1))
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_TILE_CMPXCHG_H */
diff --git a/arch/tile/include/asm/irq.h b/arch/tile/include/asm/irq.h
index f80f8ceabc67abd6ef57fce76cb1a224f53204c8..33cff9a3058b02ebb2104ab04bcc85741ec83e0d 100644
--- a/arch/tile/include/asm/irq.h
+++ b/arch/tile/include/asm/irq.h
@@ -21,7 +21,7 @@
#define NR_IRQS 32
/* IRQ numbers used for linux IPIs. */
-#define IRQ_RESCHEDULE 1
+#define IRQ_RESCHEDULE 0
#define irq_canonicalize(irq) (irq)
diff --git a/arch/tile/include/asm/spinlock_64.h b/arch/tile/include/asm/spinlock_64.h
index 72be5904e020e7df9b4923edb92bf25fbf8670a5..5f8b6a095fd84a0748ea645c96a4b3908ba6d6fb 100644
--- a/arch/tile/include/asm/spinlock_64.h
+++ b/arch/tile/include/asm/spinlock_64.h
@@ -137,7 +137,7 @@ static inline void arch_read_unlock(arch_rwlock_t *rw)
static inline void arch_write_unlock(arch_rwlock_t *rw)
{
__insn_mf();
- rw->lock = 0;
+ __insn_exch4(&rw->lock, 0); /* Avoid waiting in the write buffer. */
}
static inline int arch_read_trylock(arch_rwlock_t *rw)
diff --git a/arch/tile/include/asm/stack.h b/arch/tile/include/asm/stack.h
index 4d97a2db932e90784d37eb4f53ff7da3f80eb4e2..0e9d382a2d451482ff2d5f686cdecaa8b7f56a05 100644
--- a/arch/tile/include/asm/stack.h
+++ b/arch/tile/include/asm/stack.h
@@ -25,7 +25,6 @@
struct KBacktraceIterator {
BacktraceIterator it;
struct task_struct *task; /* task we are backtracing */
- pte_t *pgtable; /* page table for user space access */
int end; /* iteration complete. */
int new_context; /* new context is starting */
int profile; /* profiling, so stop on async intrpt */
diff --git a/arch/tile/include/asm/traps.h b/arch/tile/include/asm/traps.h
index 5f20f920f932b6c38e0a8971d1cedfb012dd729c..e28c3df4176a918c09fc56dfa702c17e0f48e401 100644
--- a/arch/tile/include/asm/traps.h
+++ b/arch/tile/include/asm/traps.h
@@ -64,7 +64,11 @@ void do_breakpoint(struct pt_regs *, int fault_num);
#ifdef __tilegx__
+/* kernel/single_step.c */
void gx_singlestep_handle(struct pt_regs *, int fault_num);
+
+/* kernel/intvec_64.S */
+void fill_ra_stack(void);
#endif
-#endif /* _ASM_TILE_SYSCALLS_H */
+#endif /* _ASM_TILE_TRAPS_H */
diff --git a/arch/tile/kernel/entry.S b/arch/tile/kernel/entry.S
index 431e9ae60488c73f29c35761170150e7f65a7a92..ec91568df880ef0d41f99f7ab86cc0fdb2330551 100644
--- a/arch/tile/kernel/entry.S
+++ b/arch/tile/kernel/entry.S
@@ -85,6 +85,7 @@ STD_ENTRY(cpu_idle_on_new_stack)
/* Loop forever on a nap during SMP boot. */
STD_ENTRY(smp_nap)
nap
+ nop /* avoid provoking the icache prefetch with a jump */
j smp_nap /* we are not architecturally guaranteed not to exit nap */
jrp lr /* clue in the backtracer */
STD_ENDPROC(smp_nap)
@@ -105,5 +106,6 @@ STD_ENTRY(_cpu_idle)
.global _cpu_idle_nap
_cpu_idle_nap:
nap
+ nop /* avoid provoking the icache prefetch with a jump */
jrp lr
STD_ENDPROC(_cpu_idle)
diff --git a/arch/tile/kernel/intvec_32.S b/arch/tile/kernel/intvec_32.S
index aecc8ed5f39bd71d48cb150fe30301425b2179b7..5d56a1ef5ba5212e6cffe97e0fe14223bc0d116b 100644
--- a/arch/tile/kernel/intvec_32.S
+++ b/arch/tile/kernel/intvec_32.S
@@ -799,6 +799,10 @@ handle_interrupt:
* This routine takes a boolean in r30 indicating if this is an NMI.
* If so, we also expect a boolean in r31 indicating whether to
* re-enable the oprofile interrupts.
+ *
+ * Note that .Lresume_userspace is jumped to directly in several
+ * places, and we need to make sure r30 is set correctly in those
+ * callers as well.
*/
STD_ENTRY(interrupt_return)
/* If we're resuming to kernel space, don't check thread flags. */
@@ -1237,7 +1241,10 @@ handle_syscall:
bzt r30, 1f
jal do_syscall_trace
FEEDBACK_REENTER(handle_syscall)
-1: j .Lresume_userspace /* jump into middle of interrupt_return */
+1: {
+ movei r30, 0 /* not an NMI */
+ j .Lresume_userspace /* jump into middle of interrupt_return */
+ }
.Linvalid_syscall:
/* Report an invalid syscall back to the user program */
@@ -1246,7 +1253,10 @@ handle_syscall:
movei r28, -ENOSYS
}
sw r29, r28
- j .Lresume_userspace /* jump into middle of interrupt_return */
+ {
+ movei r30, 0 /* not an NMI */
+ j .Lresume_userspace /* jump into middle of interrupt_return */
+ }
STD_ENDPROC(handle_syscall)
/* Return the address for oprofile to suppress in backtraces. */
@@ -1262,7 +1272,10 @@ STD_ENTRY(ret_from_fork)
jal sim_notify_fork
jal schedule_tail
FEEDBACK_REENTER(ret_from_fork)
- j .Lresume_userspace /* jump into middle of interrupt_return */
+ {
+ movei r30, 0 /* not an NMI */
+ j .Lresume_userspace /* jump into middle of interrupt_return */
+ }
STD_ENDPROC(ret_from_fork)
/*
@@ -1376,7 +1389,10 @@ handle_ill:
jal send_sigtrap /* issue a SIGTRAP */
FEEDBACK_REENTER(handle_ill)
- j .Lresume_userspace /* jump into middle of interrupt_return */
+ {
+ movei r30, 0 /* not an NMI */
+ j .Lresume_userspace /* jump into middle of interrupt_return */
+ }
.Ldispatch_normal_ill:
{
diff --git a/arch/tile/kernel/intvec_64.S b/arch/tile/kernel/intvec_64.S
index 79c93e10ba27b1a11c939e216233ec5956b6b11a..49d9d66216822a463a4e905f3425e8eb2a4f77e8 100644
--- a/arch/tile/kernel/intvec_64.S
+++ b/arch/tile/kernel/intvec_64.S
@@ -22,6 +22,7 @@
#include <asm/irqflags.h>
#include <asm/asm-offsets.h>
#include <asm/types.h>
+#include <asm/signal.h>
#include <hv/hypervisor.h>
#include <arch/abi.h>
#include <arch/interrupts.h>
@@ -605,6 +606,10 @@ handle_interrupt:
* This routine takes a boolean in r30 indicating if this is an NMI.
* If so, we also expect a boolean in r31 indicating whether to
* re-enable the oprofile interrupts.
+ *
+ * Note that .Lresume_userspace is jumped to directly in several
+ * places, and we need to make sure r30 is set correctly in those
+ * callers as well.
*/
STD_ENTRY(interrupt_return)
/* If we're resuming to kernel space, don't check thread flags. */
@@ -1039,11 +1044,28 @@ handle_syscall:
/* Do syscall trace again, if requested. */
ld r30, r31
- andi r30, r30, _TIF_SYSCALL_TRACE
- beqzt r30, 1f
+ andi r0, r30, _TIF_SYSCALL_TRACE
+ {
+ andi r0, r30, _TIF_SINGLESTEP
+ beqzt r0, 1f
+ }
jal do_syscall_trace
FEEDBACK_REENTER(handle_syscall)
-1: j .Lresume_userspace /* jump into middle of interrupt_return */
+ andi r0, r30, _TIF_SINGLESTEP
+
+1: beqzt r0, 2f
+
+ /* Single stepping -- notify ptrace. */
+ {
+ movei r0, SIGTRAP
+ jal ptrace_notify
+ }
+ FEEDBACK_REENTER(handle_syscall)
+
+2: {
+ movei r30, 0 /* not an NMI */
+ j .Lresume_userspace /* jump into middle of interrupt_return */
+ }
.Lcompat_syscall:
/*
@@ -1077,7 +1099,10 @@ handle_syscall:
movei r28, -ENOSYS
}
st r29, r28
- j .Lresume_userspace /* jump into middle of interrupt_return */
+ {
+ movei r30, 0 /* not an NMI */
+ j .Lresume_userspace /* jump into middle of interrupt_return */
+ }
STD_ENDPROC(handle_syscall)
/* Return the address for oprofile to suppress in backtraces. */
@@ -1093,7 +1118,10 @@ STD_ENTRY(ret_from_fork)
jal sim_notify_fork
jal schedule_tail
FEEDBACK_REENTER(ret_from_fork)
- j .Lresume_userspace
+ {
+ movei r30, 0 /* not an NMI */
+ j .Lresume_userspace /* jump into middle of interrupt_return */
+ }
STD_ENDPROC(ret_from_fork)
/* Various stub interrupt handlers and syscall handlers */
@@ -1156,6 +1184,18 @@ int_unalign:
push_extra_callee_saves r0
j do_trap
+/* Fill the return address stack with nonzero entries. */
+STD_ENTRY(fill_ra_stack)
+ {
+ move r0, lr
+ jal 1f
+ }
+1: jal 2f
+2: jal 3f
+3: jal 4f
+4: jrp r0
+ STD_ENDPROC(fill_ra_stack)
+
/* Include .intrpt1 array of interrupt vectors */
.section ".intrpt1", "ax"
@@ -1166,7 +1206,7 @@ int_unalign:
#define do_hardwall_trap bad_intr
#endif
- int_hand INT_MEM_ERROR, MEM_ERROR, bad_intr
+ int_hand INT_MEM_ERROR, MEM_ERROR, do_trap
int_hand INT_SINGLE_STEP_3, SINGLE_STEP_3, bad_intr
#if CONFIG_KERNEL_PL == 2
int_hand INT_SINGLE_STEP_2, SINGLE_STEP_2, gx_singlestep_handle
diff --git a/arch/tile/kernel/module.c b/arch/tile/kernel/module.c
index b90ab9925674339f1389abd511fc56d7c6881330..98d476920106084d847b54fd9bf9cc19c9e21983 100644
--- a/arch/tile/kernel/module.c
+++ b/arch/tile/kernel/module.c
@@ -67,6 +67,8 @@ void *module_alloc(unsigned long size)
area = __get_vm_area(size, VM_ALLOC, MEM_MODULE_START, MEM_MODULE_END);
if (!area)
goto error;
+ area->nr_pages = npages;
+ area->pages = pages;
if (map_vm_area(area, prot_rwx, &pages)) {
vunmap(area->addr);
diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
index 30caecac94dcae955928900c4d6841c154263810..2d5ef617bb3906cfcf1f9846af10b9d87e8d53e0 100644
--- a/arch/tile/kernel/process.c
+++ b/arch/tile/kernel/process.c
@@ -28,6 +28,7 @@
#include <linux/tracehook.h>
#include <linux/signal.h>
#include <asm/stack.h>
+#include <asm/switch_to.h>
#include <asm/homecache.h>
#include <asm/syscalls.h>
#include <asm/traps.h>
@@ -285,7 +286,7 @@ struct task_struct *validate_current(void)
static struct task_struct corrupt = { .comm = "<corrupt>" };
struct task_struct *tsk = current;
if (unlikely((unsigned long)tsk < PAGE_OFFSET ||
- (void *)tsk > high_memory ||
+ (high_memory && (void *)tsk > high_memory) ||
((unsigned long)tsk & (__alignof__(*tsk) - 1)) != 0)) {
pr_err("Corrupt 'current' %p (sp %#lx)\n", tsk, stack_pointer);
tsk = &corrupt;
diff --git a/arch/tile/kernel/setup.c b/arch/tile/kernel/setup.c
index 92a94f4920ad6e2e5422ec7775f1891d70ed9d04..bff23f4761103713ee00be2294a726fac6eeb06c 100644
--- a/arch/tile/kernel/setup.c
+++ b/arch/tile/kernel/setup.c
@@ -103,13 +103,11 @@ unsigned long __initdata pci_reserve_end_pfn = -1U;
static int __init setup_maxmem(char *str)
{
- long maxmem_mb;
- if (str == NULL || strict_strtol(str, 0, &maxmem_mb) != 0 ||
- maxmem_mb == 0)
+ unsigned long long maxmem;
+ if (str == NULL || (maxmem = memparse(str, NULL)) == 0)
return -EINVAL;
- maxmem_pfn = (maxmem_mb >> (HPAGE_SHIFT - 20)) <<
- (HPAGE_SHIFT - PAGE_SHIFT);
+ maxmem_pfn = (maxmem >> HPAGE_SHIFT) << (HPAGE_SHIFT - PAGE_SHIFT);
pr_info("Forcing RAM used to no more than %dMB\n",
maxmem_pfn >> (20 - PAGE_SHIFT));
return 0;
@@ -119,14 +117,15 @@ early_param("maxmem", setup_maxmem);
static int __init setup_maxnodemem(char *str)
{
char *endp;
- long maxnodemem_mb, node;
+ unsigned long long maxnodemem;
+ long node;
node = str ? simple_strtoul(str, &endp, 0) : INT_MAX;
- if (node >= MAX_NUMNODES || *endp != ':' ||
- strict_strtol(endp+1, 0, &maxnodemem_mb) != 0)
+ if (node >= MAX_NUMNODES || *endp != ':')
return -EINVAL;
- maxnodemem_pfn[node] = (maxnodemem_mb >> (HPAGE_SHIFT - 20)) <<
+ maxnodemem = memparse(endp+1, NULL);
+ maxnodemem_pfn[node] = (maxnodemem >> HPAGE_SHIFT) <<
(HPAGE_SHIFT - PAGE_SHIFT);
pr_info("Forcing RAM used on node %ld to no more than %dMB\n",
node, maxnodemem_pfn[node] >> (20 - PAGE_SHIFT));
@@ -913,6 +912,13 @@ void __cpuinit setup_cpu(int boot)
#ifdef CONFIG_BLK_DEV_INITRD
+/*
+ * Note that the kernel can potentially support other compression
+ * techniques than gz, though we don't do so by default. If we ever
+ * decide to do so we can either look for other filename extensions,
+ * or just allow a file with this name to be compressed with an
+ * arbitrary compressor (somewhat counterintuitively).
+ */
static int __initdata set_initramfs_file;
static char __initdata initramfs_file[128] = "initramfs.cpio.gz";
@@ -928,9 +934,9 @@ static int __init setup_initramfs_file(char *str)
early_param("initramfs_file", setup_initramfs_file);
/*
- * We look for an additional "initramfs.cpio.gz" file in the hvfs.
+ * We look for an "initramfs.cpio.gz" file in the hvfs.
* If there is one, we allocate some memory for it and it will be
- * unpacked to the initramfs after any built-in initramfs_data.
+ * unpacked to the initramfs.
*/
static void __init load_hv_initrd(void)
{
diff --git a/arch/tile/kernel/single_step.c b/arch/tile/kernel/single_step.c
index bc1eb586e24db24bf924644fe5e68b3424e7a308..9efbc1391b3ce841f8e676492d1e74e6b0a3f733 100644
--- a/arch/tile/kernel/single_step.c
+++ b/arch/tile/kernel/single_step.c
@@ -153,6 +153,25 @@ static tile_bundle_bits rewrite_load_store_unaligned(
if (((unsigned long)addr % size) == 0)
return bundle;
+ /*
+ * Return SIGBUS with the unaligned address, if requested.
+ * Note that we return SIGBUS even for completely invalid addresses
+ * as long as they are in fact unaligned; this matches what the
+ * tilepro hardware would be doing, if it could provide us with the
+ * actual bad address in an SPR, which it doesn't.
+ */
+ if (unaligned_fixup == 0) {
+ siginfo_t info = {
+ .si_signo = SIGBUS,
+ .si_code = BUS_ADRALN,
+ .si_addr = addr
+ };
+ trace_unhandled_signal("unaligned trap", regs,
+ (unsigned long)addr, SIGBUS);
+ force_sig_info(info.si_signo, &info, current);
+ return (tilepro_bundle_bits) 0;
+ }
+
#ifndef __LITTLE_ENDIAN
# error We assume little-endian representation with copy_xx_user size 2 here
#endif
@@ -192,18 +211,6 @@ static tile_bundle_bits rewrite_load_store_unaligned(
return (tile_bundle_bits) 0;
}
- if (unaligned_fixup == 0) {
- siginfo_t info = {
- .si_signo = SIGBUS,
- .si_code = BUS_ADRALN,
- .si_addr = addr
- };
- trace_unhandled_signal("unaligned trap", regs,
- (unsigned long)addr, SIGBUS);
- force_sig_info(info.si_signo, &info, current);
- return (tile_bundle_bits) 0;
- }
-
if (unaligned_printk || unaligned_fixup_count == 0) {
pr_info("Process %d/%s: PC %#lx: Fixup of"
" unaligned %s at %#lx.\n",
diff --git a/arch/tile/kernel/smp.c b/arch/tile/kernel/smp.c
index a44e103c5a636670bdbd358f5143419c24d19d7a..91da0f721958da44d91ea08c526228c6c9a015e6 100644
--- a/arch/tile/kernel/smp.c
+++ b/arch/tile/kernel/smp.c
@@ -103,7 +103,7 @@ static void smp_stop_cpu_interrupt(void)
set_cpu_online(smp_processor_id(), 0);
arch_local_irq_disable_all();
for (;;)
- asm("nap");
+ asm("nap; nop");
}
/* This function calls the 'stop' function on all other CPUs in the system. */
@@ -113,6 +113,12 @@ void smp_send_stop(void)
send_IPI_allbutself(MSG_TAG_STOP_CPU);
}
+/* On panic, just wait; we may get an smp_send_stop() later on. */
+void panic_smp_self_stop(void)
+{
+ while (1)
+ asm("nap; nop");
+}
/*
* Dispatch code called from hv_message_intr() for HV_MSG_TILE hv messages.
diff --git a/arch/tile/kernel/stack.c b/arch/tile/kernel/stack.c
index 37ee4d037e0bae6788762e23e28fd3f518f38175..b2f44c28dda6f29c1867c59464462c63ac427e6a 100644
--- a/arch/tile/kernel/stack.c
+++ b/arch/tile/kernel/stack.c
@@ -21,10 +21,12 @@
#include <linux/stacktrace.h>
#include <linux/uaccess.h>
#include <linux/mmzone.h>
+#include <linux/dcache.h>
+#include <linux/fs.h>
#include <asm/backtrace.h>
#include <asm/page.h>
-#include <asm/tlbflush.h>
#include <asm/ucontext.h>
+#include <asm/switch_to.h>
#include <asm/sigframe.h>
#include <asm/stack.h>
#include <arch/abi.h>
@@ -44,72 +46,23 @@ static int in_kernel_stack(struct KBacktraceIterator *kbt, unsigned long sp)
return sp >= kstack_base && sp < kstack_base + THREAD_SIZE;
}
-/* Is address valid for reading? */
-static int valid_address(struct KBacktraceIterator *kbt, unsigned long address)
-{
- HV_PTE *l1_pgtable = kbt->pgtable;
- HV_PTE *l2_pgtable;
- unsigned long pfn;
- HV_PTE pte;
- struct page *page;
-
- if (l1_pgtable == NULL)
- return 0; /* can't read user space in other tasks */
-
-#ifdef CONFIG_64BIT
- /* Find the real l1_pgtable by looking in the l0_pgtable. */
- pte = l1_pgtable[HV_L0_INDEX(address)];
- if (!hv_pte_get_present(pte))
- return 0;
- pfn = hv_pte_get_pfn(pte);
- if (pte_huge(pte)) {
- if (!pfn_valid(pfn)) {
- pr_err("L0 huge page has bad pfn %#lx\n", pfn);
- return 0;
- }
- return hv_pte_get_present(pte) && hv_pte_get_readable(pte);
- }
- page = pfn_to_page(pfn);
- BUG_ON(PageHighMem(page)); /* No HIGHMEM on 64-bit. */
- l1_pgtable = (HV_PTE *)pfn_to_kaddr(pfn);
-#endif
- pte = l1_pgtable[HV_L1_INDEX(address)];
- if (!hv_pte_get_present(pte))
- return 0;
- pfn = hv_pte_get_pfn(pte);
- if (pte_huge(pte)) {
- if (!pfn_valid(pfn)) {
- pr_err("huge page has bad pfn %#lx\n", pfn);
- return 0;
- }
- return hv_pte_get_present(pte) && hv_pte_get_readable(pte);
- }
-
- page = pfn_to_page(pfn);
- if (PageHighMem(page)) {
- pr_err("L2 page table not in LOWMEM (%#llx)\n",
- HV_PFN_TO_CPA(pfn));
- return 0;
- }
- l2_pgtable = (HV_PTE *)pfn_to_kaddr(pfn);
- pte = l2_pgtable[HV_L2_INDEX(address)];
- return hv_pte_get_present(pte) && hv_pte_get_readable(pte);
-}
-
/* Callback for backtracer; basically a glorified memcpy */
static bool read_memory_func(void *result, unsigned long address,
unsigned int size, void *vkbt)
{
int retval;
struct KBacktraceIterator *kbt = (struct KBacktraceIterator *)vkbt;
+
+ if (address == 0)
+ return 0;
if (__kernel_text_address(address)) {
/* OK to read kernel code. */
} else if (address >= PAGE_OFFSET) {
/* We only tolerate kernel-space reads of this task's stack */
if (!in_kernel_stack(kbt, address))
return 0;
- } else if (!valid_address(kbt, address)) {
- return 0; /* invalid user-space address */
+ } else if (!kbt->is_current) {
+ return 0; /* can't read from other user address spaces */
}
pagefault_disable();
retval = __copy_from_user_inatomic(result,
@@ -127,6 +80,8 @@ static struct pt_regs *valid_fault_handler(struct KBacktraceIterator* kbt)
unsigned long sp = kbt->it.sp;
struct pt_regs *p;
+ if (sp % sizeof(long) != 0)
+ return NULL;
if (!in_kernel_stack(kbt, sp))
return NULL;
if (!in_kernel_stack(kbt, sp + C_ABI_SAVE_AREA_SIZE + PTREGS_SIZE-1))
@@ -169,27 +124,27 @@ static int is_sigreturn(unsigned long pc)
}
/* Return a pt_regs pointer for a valid signal handler frame */
-static struct pt_regs *valid_sigframe(struct KBacktraceIterator* kbt)
+static struct pt_regs *valid_sigframe(struct KBacktraceIterator* kbt,
+ struct rt_sigframe* kframe)
{
BacktraceIterator *b = &kbt->it;
- if (b->pc == VDSO_BASE) {
- struct rt_sigframe *frame;
- unsigned long sigframe_top =
- b->sp + sizeof(struct rt_sigframe) - 1;
- if (!valid_address(kbt, b->sp) ||
- !valid_address(kbt, sigframe_top)) {
- if (kbt->verbose)
- pr_err(" (odd signal: sp %#lx?)\n",
- (unsigned long)(b->sp));
+ if (b->pc == VDSO_BASE && b->sp < PAGE_OFFSET &&
+ b->sp % sizeof(long) == 0) {
+ int retval;
+ pagefault_disable();
+ retval = __copy_from_user_inatomic(
+ kframe, (void __user __force *)b->sp,
+ sizeof(*kframe));
+ pagefault_enable();
+ if (retval != 0 ||
+ (unsigned int)(kframe->info.si_signo) >= _NSIG)
return NULL;
- }
- frame = (struct rt_sigframe *)b->sp;
if (kbt->verbose) {
pr_err(" <received signal %d>\n",
- frame->info.si_signo);
+ kframe->info.si_signo);
}
- return (struct pt_regs *)&frame->uc.uc_mcontext;
+ return (struct pt_regs *)&kframe->uc.uc_mcontext;
}
return NULL;
}
@@ -202,10 +157,11 @@ static int KBacktraceIterator_is_sigreturn(struct KBacktraceIterator *kbt)
static int KBacktraceIterator_restart(struct KBacktraceIterator *kbt)
{
struct pt_regs *p;
+ struct rt_sigframe kframe;
p = valid_fault_handler(kbt);
if (p == NULL)
- p = valid_sigframe(kbt);
+ p = valid_sigframe(kbt, &kframe);
if (p == NULL)
return 0;
backtrace_init(&kbt->it, read_memory_func, kbt,
@@ -265,41 +221,19 @@ void KBacktraceIterator_init(struct KBacktraceIterator *kbt,
/*
* Set up callback information. We grab the kernel stack base
- * so we will allow reads of that address range, and if we're
- * asking about the current process we grab the page table
- * so we can check user accesses before trying to read them.
- * We flush the TLB to avoid any weird skew issues.
+ * so we will allow reads of that address range.
*/
- is_current = (t == NULL);
+ is_current = (t == NULL || t == current);
kbt->is_current = is_current;
if (is_current)
t = validate_current();
kbt->task = t;
- kbt->pgtable = NULL;
kbt->verbose = 0; /* override in caller if desired */
kbt->profile = 0; /* override in caller if desired */
kbt->end = KBT_ONGOING;
- kbt->new_context = 0;
- if (is_current) {
- HV_PhysAddr pgdir_pa = hv_inquire_context().page_table;
- if (pgdir_pa == (unsigned long)swapper_pg_dir - PAGE_OFFSET) {
- /*
- * Not just an optimization: this also allows
- * this to work at all before va/pa mappings
- * are set up.
- */
- kbt->pgtable = swapper_pg_dir;
- } else {
- struct page *page = pfn_to_page(PFN_DOWN(pgdir_pa));
- if (!PageHighMem(page))
- kbt->pgtable = __va(pgdir_pa);
- else
- pr_err("page table not in LOWMEM"
- " (%#llx)\n", pgdir_pa);
- }
- local_flush_tlb_all();
+ kbt->new_context = 1;
+ if (is_current)
validate_stack(regs);
- }
if (regs == NULL) {
if (is_current || t->state == TASK_RUNNING) {
@@ -345,6 +279,78 @@ void KBacktraceIterator_next(struct KBacktraceIterator *kbt)
}
EXPORT_SYMBOL(KBacktraceIterator_next);
+static void describe_addr(struct KBacktraceIterator *kbt,
+ unsigned long address,
+ int have_mmap_sem, char *buf, size_t bufsize)
+{
+ struct vm_area_struct *vma;
+ size_t namelen, remaining;
+ unsigned long size, offset, adjust;
+ char *p, *modname;
+ const char *name;
+ int rc;
+
+ /*
+ * Look one byte back for every caller frame (i.e. those that
+ * aren't a new context) so we look up symbol data for the
+ * call itself, not the following instruction, which may be on
+ * a different line (or in a different function).
+ */
+ adjust = !kbt->new_context;
+ address -= adjust;
+
+ if (address >= PAGE_OFFSET) {
+ /* Handle kernel symbols. */
+ BUG_ON(bufsize < KSYM_NAME_LEN);
+ name = kallsyms_lookup(address, &size, &offset,
+ &modname, buf);
+ if (name == NULL) {
+ buf[0] = '\0';
+ return;
+ }
+ namelen = strlen(buf);
+ remaining = (bufsize - 1) - namelen;
+ p = buf + namelen;
+ rc = snprintf(p, remaining, "+%#lx/%#lx ",
+ offset + adjust, size);
+ if (modname && rc < remaining)
+ snprintf(p + rc, remaining - rc, "[%s] ", modname);
+ buf[bufsize-1] = '\0';
+ return;
+ }
+
+ /* If we don't have the mmap_sem, we can't show any more info. */
+ buf[0] = '\0';
+ if (!have_mmap_sem)
+ return;
+
+ /* Find vma info. */
+ vma = find_vma(kbt->task->mm, address);
+ if (vma == NULL || address < vma->vm_start) {
+ snprintf(buf, bufsize, "[unmapped address] ");
+ return;
+ }
+
+ if (vma->vm_file) {
+ char *s;
+ p = d_path(&vma->vm_file->f_path, buf, bufsize);
+ if (IS_ERR(p))
+ p = "?";
+ s = strrchr(p, '/');
+ if (s)
+ p = s+1;
+ } else {
+ p = "anon";
+ }
+
+ /* Generate a string description of the vma info. */
+ namelen = strlen(p);
+ remaining = (bufsize - 1) - namelen;
+ memmove(buf, p, namelen);
+ snprintf(buf + namelen, remaining, "[%lx+%lx] ",
+ vma->vm_start, vma->vm_end - vma->vm_start);
+}
+
/*
* This method wraps the backtracer's more generic support.
* It is only invoked from the architecture-specific code; show_stack()
@@ -353,6 +359,7 @@ EXPORT_SYMBOL(KBacktraceIterator_next);
void tile_show_stack(struct KBacktraceIterator *kbt, int headers)
{
int i;
+ int have_mmap_sem = 0;
if (headers) {
/*
@@ -369,31 +376,16 @@ void tile_show_stack(struct KBacktraceIterator *kbt, int headers)
kbt->verbose = 1;
i = 0;
for (; !KBacktraceIterator_end(kbt); KBacktraceIterator_next(kbt)) {
- char *modname;
- const char *name;
- unsigned long address = kbt->it.pc;
- unsigned long offset, size;
char namebuf[KSYM_NAME_LEN+100];
+ unsigned long address = kbt->it.pc;
- if (address >= PAGE_OFFSET)
- name = kallsyms_lookup(address, &size, &offset,
- &modname, namebuf);
- else
- name = NULL;
-
- if (!name)
- namebuf[0] = '\0';
- else {
- size_t namelen = strlen(namebuf);
- size_t remaining = (sizeof(namebuf) - 1) - namelen;
- char *p = namebuf + namelen;
- int rc = snprintf(p, remaining, "+%#lx/%#lx ",
- offset, size);
- if (modname && rc < remaining)
- snprintf(p + rc, remaining - rc,
- "[%s] ", modname);
- namebuf[sizeof(namebuf)-1] = '\0';
- }
+ /* Try to acquire the mmap_sem as we pass into userspace. */
+ if (address < PAGE_OFFSET && !have_mmap_sem && kbt->task->mm)
+ have_mmap_sem =
+ down_read_trylock(&kbt->task->mm->mmap_sem);
+
+ describe_addr(kbt, address, have_mmap_sem,
+ namebuf, sizeof(namebuf));
pr_err(" frame %d: 0x%lx %s(sp 0x%lx)\n",
i++, address, namebuf, (unsigned long)(kbt->it.sp));
@@ -408,6 +400,8 @@ void tile_show_stack(struct KBacktraceIterator *kbt, int headers)
pr_err("Stack dump stopped; next frame identical to this one\n");
if (headers)
pr_err("Stack dump complete\n");
+ if (have_mmap_sem)
+ up_read(&kbt->task->mm->mmap_sem);
}
EXPORT_SYMBOL(tile_show_stack);
diff --git a/arch/tile/kernel/traps.c b/arch/tile/kernel/traps.c
index 2bb6602a1ee711c64146319a39c657de79f5a7b5..73cff814ac57252065ca8086185f2fc7bb87c012 100644
--- a/arch/tile/kernel/traps.c
+++ b/arch/tile/kernel/traps.c
@@ -200,7 +200,7 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
{
siginfo_t info = { 0 };
int signo, code;
- unsigned long address;
+ unsigned long address = 0;
bundle_bits instr;
/* Re-enable interrupts. */
@@ -223,6 +223,10 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
}
switch (fault_num) {
+ case INT_MEM_ERROR:
+ signo = SIGBUS;
+ code = BUS_OBJERR;
+ break;
case INT_ILL:
if (copy_from_user(&instr, (void __user *)regs->pc,
sizeof(instr))) {
@@ -289,7 +293,10 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
address = regs->pc;
break;
#ifdef __tilegx__
- case INT_ILL_TRANS:
+ case INT_ILL_TRANS: {
+ /* Avoid a hardware erratum with the return address stack. */
+ fill_ra_stack();
+
signo = SIGSEGV;
code = SEGV_MAPERR;
if (reason & SPR_ILL_TRANS_REASON__I_STREAM_VA_RMASK)
@@ -297,6 +304,7 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
else
address = 0; /* FIXME: GX: single-step for address */
break;
+ }
#endif
default:
panic("Unexpected do_trap interrupt number %d", fault_num);
@@ -308,7 +316,8 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num,
info.si_addr = (void __user *)address;
if (signo == SIGILL)
info.si_trapno = fault_num;
- trace_unhandled_signal("trap", regs, address, signo);
+ if (signo != SIGTRAP)
+ trace_unhandled_signal("trap", regs, address, signo);
force_sig_info(signo, &info, current);
}
diff --git a/arch/tile/lib/Makefile b/arch/tile/lib/Makefile
index 0c26086ecbef01523c440b3636f8bf049bdfc8f0..985f59858234d98cf7a29df45d91edc0e6deb973 100644
--- a/arch/tile/lib/Makefile
+++ b/arch/tile/lib/Makefile
@@ -7,6 +7,7 @@ lib-y = cacheflush.o checksum.o cpumask.o delay.o uaccess.o \
strchr_$(BITS).o strlen_$(BITS).o
ifeq ($(CONFIG_TILEGX),y)
+CFLAGS_REMOVE_memcpy_user_64.o = -fno-omit-frame-pointer
lib-y += memcpy_user_64.o
else
lib-y += atomic_32.o atomic_asm_32.o memcpy_tile64.o
diff --git a/arch/tile/lib/cacheflush.c b/arch/tile/lib/cacheflush.c
index 8928aace7a641d8a2b7be866f88deefb4f5f9a1e..db4fb89e12d89a4461b8cc19c99885469fcaf22c 100644
--- a/arch/tile/lib/cacheflush.c
+++ b/arch/tile/lib/cacheflush.c
@@ -39,7 +39,21 @@ void finv_buffer_remote(void *buffer, size_t size, int hfh)
{
char *p, *base;
size_t step_size, load_count;
+
+ /*
+ * On TILEPro the striping granularity is a fixed 8KB; on
+ * TILE-Gx it is configurable, and we rely on the fact that
+ * the hypervisor always configures maximum striping, so that
+ * bits 9 and 10 of the PA are part of the stripe function, so
+ * every 512 bytes we hit a striping boundary.
+ *
+ */
+#ifdef __tilegx__
+ const unsigned long STRIPE_WIDTH = 512;
+#else
const unsigned long STRIPE_WIDTH = 8192;
+#endif
+
#ifdef __tilegx__
/*
* On TILE-Gx, we must disable the dstream prefetcher before doing
@@ -74,7 +88,7 @@ void finv_buffer_remote(void *buffer, size_t size, int hfh)
* memory, that one load would be sufficient, but since we may
* be, we also need to back up to the last load issued to
* another memory controller, which would be the point where
- * we crossed an 8KB boundary (the granularity of striping
+ * we crossed a "striping" boundary (the granularity of striping
* across memory controllers). Keep backing up and doing this
* until we are before the beginning of the buffer, or have
* hit all the controllers.
@@ -88,12 +102,22 @@ void finv_buffer_remote(void *buffer, size_t size, int hfh)
* every cache line on a full memory stripe on each
* controller" that we simply do that, to simplify the logic.
*
- * FIXME: See bug 9535 for some issues with this code.
+ * On TILE-Gx the hash-for-home function is much more complex,
+ * with the upshot being we can't readily guarantee we have
+ * hit both entries in the 128-entry AMT that were hit by any
+ * load in the entire range, so we just re-load them all.
+ * With larger buffers, we may want to consider using a hypervisor
+ * trap to issue loads directly to each hash-for-home tile for
+ * each controller (doing it from Linux would trash the TLB).
*/
if (hfh) {
step_size = L2_CACHE_BYTES;
+#ifdef __tilegx__
+ load_count = (size + L2_CACHE_BYTES - 1) / L2_CACHE_BYTES;
+#else
load_count = (STRIPE_WIDTH / L2_CACHE_BYTES) *
(1 << CHIP_LOG_NUM_MSHIMS());
+#endif
} else {
step_size = STRIPE_WIDTH;
load_count = (1 << CHIP_LOG_NUM_MSHIMS());
@@ -109,7 +133,7 @@ void finv_buffer_remote(void *buffer, size_t size, int hfh)
/* Figure out how far back we need to go. */
base = p - (step_size * (load_count - 2));
- if ((long)base < (long)buffer)
+ if ((unsigned long)base < (unsigned long)buffer)
base = buffer;
/*
diff --git a/arch/tile/lib/memcpy_user_64.c b/arch/tile/lib/memcpy_user_64.c
index 4763b3aff1cc7695f340aae288e913a79a02f6ea..37440caa7370fe3d4c052086c6143bb6ab8e583c 100644
--- a/arch/tile/lib/memcpy_user_64.c
+++ b/arch/tile/lib/memcpy_user_64.c
@@ -14,7 +14,13 @@
* Do memcpy(), but trap and return "n" when a load or store faults.
*
* Note: this idiom only works when memcpy() compiles to a leaf function.
- * If "sp" is updated during memcpy, the "jrp lr" will be incorrect.
+ * Here leaf function not only means it does not have calls, but also
+ * requires no stack operations (sp, stack frame pointer) and no
+ * use of callee-saved registers, else "jrp lr" will be incorrect since
+ * unwinding stack frame is bypassed. Since memcpy() is not complex so
+ * these conditions are satisfied here, but we need to be careful when
+ * modifying this file. This is not a clean solution but is the best
+ * one so far.
*
* Also note that we are capturing "n" from the containing scope here.
*/
diff --git a/arch/tile/lib/spinlock_common.h b/arch/tile/lib/spinlock_common.h
index c101098091327e5b52a104d2b2d4769212f80043..6ac37509faca56ab614eae690123bf9be9be9313 100644
--- a/arch/tile/lib/spinlock_common.h
+++ b/arch/tile/lib/spinlock_common.h
@@ -60,5 +60,5 @@ static void delay_backoff(int iterations)
loops += __insn_crc32_32(stack_pointer, get_cycles_low()) &
(loops - 1);
- relax(1 << exponent);
+ relax(loops);
}
diff --git a/arch/tile/mm/fault.c b/arch/tile/mm/fault.c
index cba30e9547b41682c8cfca0f3577637f1ff8cbbf..22e58f51ed23eedd405e9dc0b719eddb9550f502 100644
--- a/arch/tile/mm/fault.c
+++ b/arch/tile/mm/fault.c
@@ -130,7 +130,7 @@ static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
}
/*
- * Handle a fault on the vmalloc or module mapping area
+ * Handle a fault on the vmalloc area.
*/
static inline int vmalloc_fault(pgd_t *pgd, unsigned long address)
{
@@ -203,9 +203,14 @@ static pgd_t *get_current_pgd(void)
* interrupt or a critical region, and must do as little as possible.
* Similarly, we can't use atomic ops here, since we may be handling a
* fault caused by an atomic op access.
+ *
+ * If we find a migrating PTE while we're in an NMI context, and we're
+ * at a PC that has a registered exception handler, we don't wait,
+ * since this thread may (e.g.) have been interrupted while migrating
+ * its own stack, which would then cause us to self-deadlock.
*/
static int handle_migrating_pte(pgd_t *pgd, int fault_num,
- unsigned long address,
+ unsigned long address, unsigned long pc,
int is_kernel_mode, int write)
{
pud_t *pud;
@@ -227,6 +232,8 @@ static int handle_migrating_pte(pgd_t *pgd, int fault_num,
pte_offset_kernel(pmd, address);
pteval = *pte;
if (pte_migrating(pteval)) {
+ if (in_nmi() && search_exception_tables(pc))
+ return 0;
wait_for_migration(pte);
return 1;
}
@@ -300,7 +307,7 @@ static int handle_page_fault(struct pt_regs *regs,
* rather than trying to patch up the existing PTE.
*/
pgd = get_current_pgd();
- if (handle_migrating_pte(pgd, fault_num, address,
+ if (handle_migrating_pte(pgd, fault_num, address, regs->pc,
is_kernel_mode, write))
return 1;
@@ -335,9 +342,12 @@ static int handle_page_fault(struct pt_regs *regs,
/*
* If we're trying to touch user-space addresses, we must
* be either at PL0, or else with interrupts enabled in the
- * kernel, so either way we can re-enable interrupts here.
+ * kernel, so either way we can re-enable interrupts here
+ * unless we are doing atomic access to user space with
+ * interrupts disabled.
*/
- local_irq_enable();
+ if (!(regs->flags & PT_FLAGS_DISABLE_IRQ))
+ local_irq_enable();
mm = tsk->mm;
@@ -665,7 +675,7 @@ struct intvec_state do_page_fault_ics(struct pt_regs *regs, int fault_num,
*/
if (fault_num == INT_DTLB_ACCESS)
write = 1;
- if (handle_migrating_pte(pgd, fault_num, address, 1, write))
+ if (handle_migrating_pte(pgd, fault_num, address, pc, 1, write))
return state;
/* Return zero so that we continue on with normal fault handling. */
diff --git a/arch/tile/mm/homecache.c b/arch/tile/mm/homecache.c
index 1cc6ae477c98b59711c29deb5674e50c63c96be3..499f73770b05d09e1616e1d9a2293a20c7ae1bac 100644
--- a/arch/tile/mm/homecache.c
+++ b/arch/tile/mm/homecache.c
@@ -394,6 +394,7 @@ int page_home(struct page *page)
return pte_to_home(*virt_to_pte(NULL, kva));
}
}
+EXPORT_SYMBOL(page_home);
void homecache_change_page_home(struct page *page, int order, int home)
{
diff --git a/arch/tile/mm/init.c b/arch/tile/mm/init.c
index 830c4908ea76cf4c7156777db8a8cced9fb887f9..6a9d20ddc34f416438a7d9717cf75919ea7fa34b 100644
--- a/arch/tile/mm/init.c
+++ b/arch/tile/mm/init.c
@@ -254,11 +254,6 @@ static pgprot_t __init init_pgprot(ulong address)
return construct_pgprot(PAGE_KERNEL_RO, PAGE_HOME_IMMUTABLE);
}
- /* As a performance optimization, keep the boot init stack here. */
- if (address >= (ulong)&init_thread_union &&
- address < (ulong)&init_thread_union + THREAD_SIZE)
- return construct_pgprot(PAGE_KERNEL, smp_processor_id());
-
#ifndef __tilegx__
#if !ATOMIC_LOCKS_FOUND_VIA_TABLE()
/* Force the atomic_locks[] array page to be hash-for-home. */
@@ -557,6 +552,7 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
address = MEM_SV_INTRPT;
pmd = get_pmd(pgtables, address);
+ pfn = 0; /* code starts at PA 0 */
if (ktext_small) {
/* Allocate an L2 PTE for the kernel text */
int cpu = 0;
@@ -579,10 +575,15 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
}
BUG_ON(address != (unsigned long)_stext);
- pfn = 0; /* code starts at PA 0 */
- pte = alloc_pte();
- for (pte_ofs = 0; address < (unsigned long)_einittext;
- pfn++, pte_ofs++, address += PAGE_SIZE) {
+ pte = NULL;
+ for (; address < (unsigned long)_einittext;
+ pfn++, address += PAGE_SIZE) {
+ pte_ofs = pte_index(address);
+ if (pte_ofs == 0) {
+ if (pte)
+ assign_pte(pmd++, pte);
+ pte = alloc_pte();
+ }
if (!ktext_local) {
prot = set_remote_cache_cpu(prot, cpu);
cpu = cpumask_next(cpu, &ktext_mask);
@@ -591,7 +592,8 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
}
pte[pte_ofs] = pfn_pte(pfn, prot);
}
- assign_pte(pmd, pte);
+ if (pte)
+ assign_pte(pmd, pte);
} else {
pte_t pteval = pfn_pte(0, PAGE_KERNEL_EXEC);
pteval = pte_mkhuge(pteval);
@@ -614,7 +616,9 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
else
pteval = hv_pte_set_mode(pteval,
HV_PTE_MODE_CACHE_NO_L3);
- *(pte_t *)pmd = pteval;
+ for (; address < (unsigned long)_einittext;
+ pfn += PFN_DOWN(HPAGE_SIZE), address += HPAGE_SIZE)
+ *(pte_t *)(pmd++) = pfn_pte(pfn, pteval);
}
/* Set swapper_pgprot here so it is flushed to memory right away. */
diff --git a/arch/tile/mm/pgtable.c b/arch/tile/mm/pgtable.c
index 87303693a0727faa96d844d58dc9115a4dd85b10..2410aa899b3e7c9c17079d2bf78d2d4eaf1eb8b1 100644
--- a/arch/tile/mm/pgtable.c
+++ b/arch/tile/mm/pgtable.c
@@ -177,14 +177,10 @@ void shatter_huge_page(unsigned long addr)
if (!pmd_huge_page(*pmd))
return;
- /*
- * Grab the pgd_lock, since we may need it to walk the pgd_list,
- * and since we need some kind of lock here to avoid races.
- */
- spin_lock_irqsave(&pgd_lock, flags);
+ spin_lock_irqsave(&init_mm.page_table_lock, flags);
if (!pmd_huge_page(*pmd)) {
/* Lost the race to convert the huge page. */
- spin_unlock_irqrestore(&pgd_lock, flags);
+ spin_unlock_irqrestore(&init_mm.page_table_lock, flags);
return;
}
@@ -194,6 +190,7 @@ void shatter_huge_page(unsigned long addr)
#ifdef __PAGETABLE_PMD_FOLDED
/* Walk every pgd on the system and update the pmd there. */
+ spin_lock(&pgd_lock);
list_for_each(pos, &pgd_list) {
pmd_t *copy_pmd;
pgd = list_to_pgd(pos) + pgd_index(addr);
@@ -201,6 +198,7 @@ void shatter_huge_page(unsigned long addr)
copy_pmd = pmd_offset(pud, addr);
__set_pmd(copy_pmd, *pmd);
}
+ spin_unlock(&pgd_lock);
#endif
/* Tell every cpu to notice the change. */
@@ -208,7 +206,7 @@ void shatter_huge_page(unsigned long addr)
cpu_possible_mask, NULL, 0);
/* Hold the lock until the TLB flush is finished to avoid races. */
- spin_unlock_irqrestore(&pgd_lock, flags);
+ spin_unlock_irqrestore(&init_mm.page_table_lock, flags);
}
/*
@@ -217,9 +215,13 @@ void shatter_huge_page(unsigned long addr)
* against pageattr.c; it is the unique case in which a valid change
* of kernel pagetables can't be lazily synchronized by vmalloc faults.
* vmalloc faults work because attached pagetables are never freed.
- * The locking scheme was chosen on the basis of manfred's
- * recommendations and having no core impact whatsoever.
- * -- wli
+ *
+ * The lock is always taken with interrupts disabled, unlike on x86
+ * and other platforms, because we need to take the lock in
+ * shatter_huge_page(), which may be called from an interrupt context.
+ * We are not at risk from the tlbflush IPI deadlock that was seen on
+ * x86, since we use the flush_remote() API to have the hypervisor do
+ * the TLB flushes regardless of irq disabling.
*/
DEFINE_SPINLOCK(pgd_lock);
LIST_HEAD(pgd_list);
@@ -469,10 +471,18 @@ void __set_pte(pte_t *ptep, pte_t pte)
void set_pte(pte_t *ptep, pte_t pte)
{
- struct page *page = pfn_to_page(pte_pfn(pte));
-
- /* Update the home of a PTE if necessary */
- pte = pte_set_home(pte, page_home(page));
+ if (pte_present(pte) &&
+ (!CHIP_HAS_MMIO() || hv_pte_get_mode(pte) != HV_PTE_MODE_MMIO)) {
+ /* The PTE actually references physical memory. */
+ unsigned long pfn = pte_pfn(pte);
+ if (pfn_valid(pfn)) {
+ /* Update the home of the PTE from the struct page. */
+ pte = pte_set_home(pte, page_home(pfn_to_page(pfn)));
+ } else if (hv_pte_get_mode(pte) == 0) {
+ /* remap_pfn_range(), etc, must supply PTE mode. */
+ panic("set_pte(): out-of-range PFN and mode 0\n");
+ }
+ }
__set_pte(ptep, pte);
}
diff --git a/drivers/char/tile-srom.c b/drivers/char/tile-srom.c
index 4dc019408fac7aa04b59e95f7deed8fb586ffe9e..3b22a606f79dc143abbece02b4893a71deee6e1b 100644
--- a/drivers/char/tile-srom.c
+++ b/drivers/char/tile-srom.c
@@ -194,17 +194,17 @@ static ssize_t srom_read(struct file *filp, char __user *buf,
hv_retval = _srom_read(srom->hv_devhdl, kernbuf,
*f_pos, bytes_this_pass);
- if (hv_retval > 0) {
- if (copy_to_user(buf, kernbuf, hv_retval) != 0) {
- retval = -EFAULT;
- break;
- }
- } else if (hv_retval <= 0) {
+ if (hv_retval <= 0) {
if (retval == 0)
retval = hv_retval;
break;
}
+ if (copy_to_user(buf, kernbuf, hv_retval) != 0) {
+ retval = -EFAULT;
+ break;
+ }
+
retval += hv_retval;
*f_pos += hv_retval;
buf += hv_retval;
diff --git a/drivers/edac/tile_edac.c b/drivers/edac/tile_edac.c
index 1d5cf06f6c6b9757de37fc5ed86b50f93bb048e7..e99d00976189344193e974cc9b972512a8f7359e 100644
--- a/drivers/edac/tile_edac.c
+++ b/drivers/edac/tile_edac.c
@@ -145,7 +145,11 @@ static int __devinit tile_edac_mc_probe(struct platform_device *pdev)
mci->edac_ctl_cap = EDAC_FLAG_SECDED;
mci->mod_name = DRV_NAME;
+#ifdef __tilegx__
+ mci->ctl_name = "TILEGx_Memory_Controller";
+#else
mci->ctl_name = "TILEPro_Memory_Controller";
+#endif
mci->dev_name = dev_name(&pdev->dev);
mci->edac_check = tile_edac_check;
diff --git a/drivers/net/ethernet/tile/tilepro.c b/drivers/net/ethernet/tile/tilepro.c
index 261356c2dc99ed4bdff8af73afb132c9baa6f3e7..3d501ec7fad7f67775ca1f11fe4c3870db4f61d7 100644
--- a/drivers/net/ethernet/tile/tilepro.c
+++ b/drivers/net/ethernet/tile/tilepro.c
@@ -342,6 +342,21 @@ inline int __netio_fastio1(u32 fastio_index, u32 arg0)
}
+static void tile_net_return_credit(struct tile_net_cpu *info)
+{
+ struct tile_netio_queue *queue = &info->queue;
+ netio_queue_user_impl_t *qup = &queue->__user_part;
+
+ /* Return four credits after every fourth packet. */
+ if (--qup->__receive_credit_remaining == 0) {
+ u32 interval = qup->__receive_credit_interval;
+ qup->__receive_credit_remaining = interval;
+ __netio_fastio_return_credits(qup->__fastio_index, interval);
+ }
+}
+
+
+
/*
* Provide a linux buffer to LIPP.
*/
@@ -433,7 +448,7 @@ static bool tile_net_provide_needed_buffer(struct tile_net_cpu *info,
struct sk_buff **skb_ptr;
/* Request 96 extra bytes for alignment purposes. */
- skb = netdev_alloc_skb(info->napi->dev, len + padding);
+ skb = netdev_alloc_skb(info->napi.dev, len + padding);
if (skb == NULL)
return false;
@@ -864,19 +879,11 @@ static bool tile_net_poll_aux(struct tile_net_cpu *info, int index)
stats->rx_packets++;
stats->rx_bytes += len;
-
- if (small)
- info->num_needed_small_buffers++;
- else
- info->num_needed_large_buffers++;
}
- /* Return four credits after every fourth packet. */
- if (--qup->__receive_credit_remaining == 0) {
- u32 interval = qup->__receive_credit_interval;
- qup->__receive_credit_remaining = interval;
- __netio_fastio_return_credits(qup->__fastio_index, interval);
- }
+ /* ISSUE: It would be nice to defer this until the packet has */
+ /* actually been processed. */
+ tile_net_return_credit(info);
/* Consume this packet. */
qup->__packet_receive_read = index2;
@@ -1543,7 +1550,7 @@ static int tile_net_drain_lipp_buffers(struct tile_net_priv *priv)
/* Drain all the LIPP buffers. */
while (true) {
- int buffer;
+ unsigned int buffer;
/* NOTE: This should never fail. */
if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&buffer,
@@ -1707,7 +1714,7 @@ static unsigned int tile_net_tx_frags(lepp_frag_t *frags,
if (!hash_default) {
void *va = pfn_to_kaddr(pfn) + f->page_offset;
BUG_ON(PageHighMem(skb_frag_page(f)));
- finv_buffer_remote(va, f->size, 0);
+ finv_buffer_remote(va, skb_frag_size(f), 0);
}
cpa = ((phys_addr_t)pfn << PAGE_SHIFT) + f->page_offset;
@@ -1735,8 +1742,8 @@ static unsigned int tile_net_tx_frags(lepp_frag_t *frags,
* Sometimes, if "sendfile()" requires copying, we will be called with
* "data" containing the header and payload, with "frags" being empty.
*
- * In theory, "sh->nr_frags" could be 3, but in practice, it seems
- * that this will never actually happen.
+ * Sometimes, for example when using NFS over TCP, a single segment can
+ * span 3 fragments, which must be handled carefully in LEPP.
*
* See "emulate_large_send_offload()" for some reference code, which
* does not handle checksumming.
@@ -1844,10 +1851,8 @@ static int tile_net_tx_tso(struct sk_buff *skb, struct net_device *dev)
spin_lock_irqsave(&priv->eq_lock, irqflags);
- /*
- * Handle completions if needed to make room.
- * HACK: Spin until there is sufficient room.
- */
+ /* Handle completions if needed to make room. */
+ /* NOTE: Return NETDEV_TX_BUSY if there is still no room. */
if (lepp_num_free_comp_slots(eq) == 0) {
nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
if (nolds == 0) {
@@ -1861,6 +1866,7 @@ static int tile_net_tx_tso(struct sk_buff *skb, struct net_device *dev)
cmd_tail = eq->cmd_tail;
/* Prepare to advance, detecting full queue. */
+ /* NOTE: Return NETDEV_TX_BUSY if the queue is full. */
cmd_next = cmd_tail + cmd_size;
if (cmd_tail < cmd_head && cmd_next >= cmd_head)
goto busy;
@@ -2023,10 +2029,8 @@ static int tile_net_tx(struct sk_buff *skb, struct net_device *dev)
spin_lock_irqsave(&priv->eq_lock, irqflags);
- /*
- * Handle completions if needed to make room.
- * HACK: Spin until there is sufficient room.
- */
+ /* Handle completions if needed to make room. */
+ /* NOTE: Return NETDEV_TX_BUSY if there is still no room. */
if (lepp_num_free_comp_slots(eq) == 0) {
nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
if (nolds == 0) {
@@ -2040,6 +2044,7 @@ static int tile_net_tx(struct sk_buff *skb, struct net_device *dev)
cmd_tail = eq->cmd_tail;
/* Copy the commands, or fail. */
+ /* NOTE: Return NETDEV_TX_BUSY if the queue is full. */
for (i = 0; i < num_frags; i++) {
/* Prepare to advance, detecting full queue. */
@@ -2261,6 +2266,23 @@ static int tile_net_get_mac(struct net_device *dev)
return 0;
}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/*
+ * Polling 'interrupt' - used by things like netconsole to send skbs
+ * without having to re-enable interrupts. It's not called while
+ * the interrupt routine is executing.
+ */
+static void tile_net_netpoll(struct net_device *dev)
+{
+ struct tile_net_priv *priv = netdev_priv(dev);
+ disable_percpu_irq(priv->intr_id);
+ tile_net_handle_ingress_interrupt(priv->intr_id, dev);
+ enable_percpu_irq(priv->intr_id, 0);
+}
+#endif
+
+
static const struct net_device_ops tile_net_ops = {
.ndo_open = tile_net_open,
.ndo_stop = tile_net_stop,
@@ -2269,7 +2291,10 @@ static const struct net_device_ops tile_net_ops = {
.ndo_get_stats = tile_net_get_stats,
.ndo_change_mtu = tile_net_change_mtu,
.ndo_tx_timeout = tile_net_tx_timeout,
- .ndo_set_mac_address = tile_net_set_mac_address
+ .ndo_set_mac_address = tile_net_set_mac_address,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = tile_net_netpoll,
+#endif
};
@@ -2409,7 +2434,7 @@ static void tile_net_cleanup(void)
*/
static int tile_net_init_module(void)
{
- pr_info("Tilera IPP Net Driver\n");
+ pr_info("Tilera Network Driver\n");
tile_net_devs[0] = tile_net_dev_init("xgbe0");
tile_net_devs[1] = tile_net_dev_init("xgbe1");