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Date: Fri, 13 Aug 2010 08:52:19 -0400
From: Chris Metcalf <cmetcalf@...era.com>
To: linux-kernel@...r.kernel.org
Subject: [PATCH] arch/tile: Various cleanups.
This change rolls up random cleanups not representing any actual bugs.
- Remove a stale CONFIG_ value from the default tile_defconfig
- Remove unused tns_atomic_xxx() family of methods from <asm/atomic.h>
- Optimize get_order() using Tile's "clz" instruction
- Fix a bad hypervisor upcall name (not currently used in Linux anyway)
- Use __copy_in_user_inatomic() name for consistency, and export it
- Export some additional hypervisor driver I/O upcalls and some homecache calls
- Remove the obfuscating MEMCPY_TEST_WH64 support code
- Other stray comment cleanups, #if 0 removal, etc.
Signed-off-by: Chris Metcalf <cmetcalf@...era.com>
---
arch/tile/configs/tile_defconfig | 1 -
arch/tile/include/asm/atomic_32.h | 37 -------------------------------------
arch/tile/include/asm/page.h | 6 +++++-
arch/tile/include/asm/uaccess.h | 4 ++--
arch/tile/include/hv/hypervisor.h | 8 ++++----
arch/tile/lib/Makefile | 4 +++-
arch/tile/lib/exports.c | 16 +++++++++++-----
arch/tile/lib/memcpy_32.S | 20 ++++----------------
arch/tile/lib/memset_32.c | 25 -------------------------
arch/tile/mm/fault.c | 8 ++++++++
arch/tile/mm/homecache.c | 3 +++
11 files changed, 40 insertions(+), 92 deletions(-)
diff --git a/arch/tile/configs/tile_defconfig b/arch/tile/configs/tile_defconfig
index f34c70b..5ad1a71 100644
--- a/arch/tile/configs/tile_defconfig
+++ b/arch/tile/configs/tile_defconfig
@@ -231,7 +231,6 @@ CONFIG_HARDWALL=y
CONFIG_MEMPROF=y
CONFIG_XGBE=y
CONFIG_NET_TILE=y
-CONFIG_PSEUDO_NAPI=y
CONFIG_TILEPCI_ENDP=y
CONFIG_TILEPCI_HOST_SUBSET=m
CONFIG_TILE_IDE_GPIO=y
diff --git a/arch/tile/include/asm/atomic_32.h b/arch/tile/include/asm/atomic_32.h
index 40a5a3a..ed359ae 100644
--- a/arch/tile/include/asm/atomic_32.h
+++ b/arch/tile/include/asm/atomic_32.h
@@ -255,43 +255,6 @@ static inline void atomic64_set(atomic64_t *v, u64 n)
#define smp_mb__after_atomic_dec() do { } while (0)
#define smp_mb__after_atomic_inc() do { } while (0)
-
-/*
- * Support "tns" atomic integers. These are atomic integers that can
- * hold any value but "1". They are more efficient than regular atomic
- * operations because the "lock" (aka acquire) step is a single "tns"
- * in the uncontended case, and the "unlock" (aka release) step is a
- * single "store" without an mf. (However, note that on tilepro the
- * "tns" will evict the local cache line, so it's not all upside.)
- *
- * Note that you can ONLY observe the value stored in the pointer
- * using these operations; a direct read of the value may confusingly
- * return the special value "1".
- */
-
-int __tns_atomic_acquire(atomic_t *);
-void __tns_atomic_release(atomic_t *p, int v);
-
-static inline void tns_atomic_set(atomic_t *v, int i)
-{
- __tns_atomic_acquire(v);
- __tns_atomic_release(v, i);
-}
-
-static inline int tns_atomic_cmpxchg(atomic_t *v, int o, int n)
-{
- int ret = __tns_atomic_acquire(v);
- __tns_atomic_release(v, (ret == o) ? n : ret);
- return ret;
-}
-
-static inline int tns_atomic_xchg(atomic_t *v, int n)
-{
- int ret = __tns_atomic_acquire(v);
- __tns_atomic_release(v, n);
- return ret;
-}
-
#endif /* !__ASSEMBLY__ */
/*
diff --git a/arch/tile/include/asm/page.h b/arch/tile/include/asm/page.h
index f894a90..7d90641 100644
--- a/arch/tile/include/asm/page.h
+++ b/arch/tile/include/asm/page.h
@@ -129,6 +129,11 @@ static inline u64 pmd_val(pmd_t pmd)
#endif
+static inline __attribute_const__ int get_order(unsigned long size)
+{
+ return BITS_PER_LONG - __builtin_clzl((size - 1) >> PAGE_SHIFT);
+}
+
#endif /* !__ASSEMBLY__ */
#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
@@ -332,7 +337,6 @@ extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
(VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
#include <asm-generic/memory_model.h>
-#include <asm-generic/getorder.h>
#endif /* __KERNEL__ */
diff --git a/arch/tile/include/asm/uaccess.h b/arch/tile/include/asm/uaccess.h
index ed17a80..ef34d2c 100644
--- a/arch/tile/include/asm/uaccess.h
+++ b/arch/tile/include/asm/uaccess.h
@@ -389,14 +389,14 @@ static inline unsigned long __must_check copy_from_user(void *to,
* Returns number of bytes that could not be copied.
* On success, this will be zero.
*/
-extern unsigned long __copy_in_user_asm(
+extern unsigned long __copy_in_user_inatomic(
void __user *to, const void __user *from, unsigned long n);
static inline unsigned long __must_check
__copy_in_user(void __user *to, const void __user *from, unsigned long n)
{
might_sleep();
- return __copy_in_user_asm(to, from, n);
+ return __copy_in_user_inatomic(to, from, n);
}
static inline unsigned long __must_check
diff --git a/arch/tile/include/hv/hypervisor.h b/arch/tile/include/hv/hypervisor.h
index 59b46dc..9bd303a 100644
--- a/arch/tile/include/hv/hypervisor.h
+++ b/arch/tile/include/hv/hypervisor.h
@@ -532,11 +532,11 @@ void hv_disable_intr(HV_IntrMask disab_mask);
*/
void hv_clear_intr(HV_IntrMask clear_mask);
-/** Assert a set of device interrupts.
+/** Raise a set of device interrupts.
*
- * @param assert_mask Bitmap of interrupts to clear.
+ * @param raise_mask Bitmap of interrupts to raise.
*/
-void hv_assert_intr(HV_IntrMask assert_mask);
+void hv_raise_intr(HV_IntrMask raise_mask);
/** Trigger a one-shot interrupt on some tile
*
@@ -1712,7 +1712,7 @@ typedef struct
* @param cache_control This argument allows you to specify a length of
* physical address space to flush (maximum HV_FLUSH_MAX_CACHE_LEN).
* You can "or" in HV_FLUSH_EVICT_L2 to flush the whole L2 cache.
- * You can "or" in HV_FLUSH_EVICT_LI1 to flush the whole LII cache.
+ * You can "or" in HV_FLUSH_EVICT_L1I to flush the whole L1I cache.
* HV_FLUSH_ALL flushes all caches.
* @param cache_cpumask Bitmask (in row-major order, supervisor-relative) of
* tile indices to perform cache flush on. The low bit of the first
diff --git a/arch/tile/lib/Makefile b/arch/tile/lib/Makefile
index 438af38..746dc81 100644
--- a/arch/tile/lib/Makefile
+++ b/arch/tile/lib/Makefile
@@ -7,7 +7,9 @@ lib-y = cacheflush.o checksum.o cpumask.o delay.o \
memcpy_$(BITS).o memchr_$(BITS).o memmove_$(BITS).o memset_$(BITS).o \
strchr_$(BITS).o strlen_$(BITS).o
-ifneq ($(CONFIG_TILEGX),y)
+ifeq ($(CONFIG_TILEGX),y)
+lib-y += memcpy_user_64.o
+else
lib-y += atomic_32.o atomic_asm_32.o memcpy_tile64.o
endif
diff --git a/arch/tile/lib/exports.c b/arch/tile/lib/exports.c
index 6bc7b52..ce5dbf5 100644
--- a/arch/tile/lib/exports.c
+++ b/arch/tile/lib/exports.c
@@ -36,21 +36,29 @@ EXPORT_SYMBOL(clear_user_asm);
EXPORT_SYMBOL(current_text_addr);
EXPORT_SYMBOL(dump_stack);
-/* arch/tile/lib/__memcpy.S */
-/* NOTE: on TILE64, these symbols appear in arch/tile/lib/memcpy_tile64.c */
+/* arch/tile/lib/, various memcpy files */
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(__copy_to_user_inatomic);
EXPORT_SYMBOL(__copy_from_user_inatomic);
EXPORT_SYMBOL(__copy_from_user_zeroing);
+#ifdef __tilegx__
+EXPORT_SYMBOL(__copy_in_user_inatomic);
+#endif
/* hypervisor glue */
#include <hv/hypervisor.h>
EXPORT_SYMBOL(hv_dev_open);
EXPORT_SYMBOL(hv_dev_pread);
EXPORT_SYMBOL(hv_dev_pwrite);
+EXPORT_SYMBOL(hv_dev_preada);
+EXPORT_SYMBOL(hv_dev_pwritea);
+EXPORT_SYMBOL(hv_dev_poll);
+EXPORT_SYMBOL(hv_dev_poll_cancel);
EXPORT_SYMBOL(hv_dev_close);
+EXPORT_SYMBOL(hv_sysconf);
+EXPORT_SYMBOL(hv_confstr);
-/* -ltile-cc */
+/* libgcc.a */
uint32_t __udivsi3(uint32_t dividend, uint32_t divisor);
EXPORT_SYMBOL(__udivsi3);
int32_t __divsi3(int32_t dividend, int32_t divisor);
@@ -70,8 +78,6 @@ EXPORT_SYMBOL(__moddi3);
#ifndef __tilegx__
uint64_t __ll_mul(uint64_t n0, uint64_t n1);
EXPORT_SYMBOL(__ll_mul);
-#endif
-#ifndef __tilegx__
int64_t __muldi3(int64_t, int64_t);
EXPORT_SYMBOL(__muldi3);
uint64_t __lshrdi3(uint64_t, unsigned int);
diff --git a/arch/tile/lib/memcpy_32.S b/arch/tile/lib/memcpy_32.S
index f92984b..30c3b7e 100644
--- a/arch/tile/lib/memcpy_32.S
+++ b/arch/tile/lib/memcpy_32.S
@@ -17,10 +17,6 @@
#include <arch/chip.h>
-#if CHIP_HAS_WH64() || defined(MEMCPY_TEST_WH64)
-#define MEMCPY_USE_WH64
-#endif
-
#include <linux/linkage.h>
@@ -160,7 +156,7 @@ EX: { sw r0, r3; addi r0, r0, 4; addi r2, r2, -4 }
{ addi r3, r1, 60; andi r9, r9, -64 }
-#ifdef MEMCPY_USE_WH64
+#if CHIP_HAS_WH64()
/* No need to prefetch dst, we'll just do the wh64
* right before we copy a line.
*/
@@ -173,7 +169,7 @@ EX: { lw r6, r3; addi r3, r3, 64 }
/* Intentionally stall for a few cycles to leave L2 cache alone. */
{ bnzt zero, . }
EX: { lw r7, r3; addi r3, r3, 64 }
-#ifndef MEMCPY_USE_WH64
+#if !CHIP_HAS_WH64()
/* Prefetch the dest */
/* Intentionally stall for a few cycles to leave L2 cache alone. */
{ bnzt zero, . }
@@ -288,15 +284,7 @@ EX: { lw r7, r3; addi r3, r3, 64 }
/* Fill second L1D line. */
EX: { lw r17, r17; addi r1, r1, 48; mvz r3, r13, r1 } /* r17 = WORD_4 */
-#ifdef MEMCPY_TEST_WH64
- /* Issue a fake wh64 that clobbers the destination words
- * with random garbage, for testing.
- */
- { movei r19, 64; crc32_32 r10, r2, r9 }
-.Lwh64_test_loop:
-EX: { sw r9, r10; addi r9, r9, 4; addi r19, r19, -4 }
- { bnzt r19, .Lwh64_test_loop; crc32_32 r10, r10, r19 }
-#elif CHIP_HAS_WH64()
+#if CHIP_HAS_WH64()
/* Prepare destination line for writing. */
EX: { wh64 r9; addi r9, r9, 64 }
#else
@@ -340,7 +328,7 @@ EX: { lw r18, r1; addi r1, r1, 4 } /* r18 = WORD_8 */
EX: { sw r0, r16; addi r0, r0, 4; add r16, r0, r2 } /* store(WORD_0) */
EX: { sw r0, r13; addi r0, r0, 4; andi r16, r16, -64 } /* store(WORD_1) */
EX: { sw r0, r14; addi r0, r0, 4; slt_u r16, r9, r16 } /* store(WORD_2) */
-#ifdef MEMCPY_USE_WH64
+#if CHIP_HAS_WH64()
EX: { sw r0, r15; addi r0, r0, 4; addi r13, sp, -64 } /* store(WORD_3) */
#else
/* Back up the r9 to a cache line we are already storing to
diff --git a/arch/tile/lib/memset_32.c b/arch/tile/lib/memset_32.c
index bfde5d8..d014c1f 100644
--- a/arch/tile/lib/memset_32.c
+++ b/arch/tile/lib/memset_32.c
@@ -141,7 +141,6 @@ void *memset(void *s, int c, size_t n)
*/
__insn_prefetch(&out32[ahead32]);
-#if 1
#if CACHE_LINE_SIZE_IN_WORDS % 4 != 0
#error "Unhandled CACHE_LINE_SIZE_IN_WORDS"
#endif
@@ -157,30 +156,6 @@ void *memset(void *s, int c, size_t n)
*out32++ = v32;
*out32++ = v32;
}
-#else
- /* Unfortunately, due to a code generator flaw this
- * allocates a separate register for each of these
- * stores, which requires a large number of spills,
- * which makes this procedure enormously bigger
- * (something like 70%)
- */
- *out32++ = v32;
- *out32++ = v32;
- *out32++ = v32;
- *out32++ = v32;
- *out32++ = v32;
- *out32++ = v32;
- *out32++ = v32;
- *out32++ = v32;
- *out32++ = v32;
- *out32++ = v32;
- *out32++ = v32;
- *out32++ = v32;
- *out32++ = v32;
- *out32++ = v32;
- *out32++ = v32;
- n32 -= 16;
-#endif
/* To save compiled code size, reuse this loop even
* when we run out of prefetching to do by dropping
diff --git a/arch/tile/mm/fault.c b/arch/tile/mm/fault.c
index 0011f06..704f3e8 100644
--- a/arch/tile/mm/fault.c
+++ b/arch/tile/mm/fault.c
@@ -567,6 +567,14 @@ do_sigbus:
* since that might indicate we have not yet squirreled the SPR
* contents away and can thus safely take a recursive interrupt.
* Accordingly, the hypervisor passes us the PC via SYSTEM_SAVE_1_2.
+ *
+ * Note that this routine is called before homecache_tlb_defer_enter(),
+ * which means that we can properly unlock any atomics that might
+ * be used there (good), but also means we must be very sensitive
+ * to not touch any data structures that might be located in memory
+ * that could migrate, as we could be entering the kernel on a dataplane
+ * cpu that has been deferring kernel TLB updates. This means, for
+ * example, that we can't migrate init_mm or its pgd.
*/
struct intvec_state do_page_fault_ics(struct pt_regs *regs, int fault_num,
unsigned long address,
diff --git a/arch/tile/mm/homecache.c b/arch/tile/mm/homecache.c
index 97c478e..fb3b4a5 100644
--- a/arch/tile/mm/homecache.c
+++ b/arch/tile/mm/homecache.c
@@ -29,6 +29,7 @@
#include <linux/timex.h>
#include <linux/cache.h>
#include <linux/smp.h>
+#include <linux/module.h>
#include <asm/page.h>
#include <asm/sections.h>
@@ -348,6 +349,7 @@ pte_t pte_set_home(pte_t pte, int home)
return pte;
}
+EXPORT_SYMBOL(pte_set_home);
/*
* The routines in this section are the "static" versions of the normal
@@ -403,6 +405,7 @@ struct page *homecache_alloc_pages(gfp_t gfp_mask,
homecache_change_page_home(page, order, home);
return page;
}
+EXPORT_SYMBOL(homecache_alloc_pages);
struct page *homecache_alloc_pages_node(int nid, gfp_t gfp_mask,
unsigned int order, int home)
--
1.6.5.2
--
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