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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-03-01 18:14:45 +1100
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-03-09 10:55:12 +1100
commit9be72573a80648866ed0045db22d97c6e160a540 (patch)
tree5fc692504504dfbcce47489877481d3bd465ccd7 /arch
parent9f2f79e3a3c19ae745d0439d6e0eed31df28de3c (diff)
downloadlinaro-lsk-9be72573a80648866ed0045db22d97c6e160a540.tar.gz
powerpc: Add support for page fault retry and fatal signals
Other architectures such as x86 and ARM have been growing new support for features like retrying page faults after dropping the mm semaphore to break contention, or being able to return from a stuck page fault when a SIGKILL is pending. This refactors our implementation of do_page_fault() to move the error handling out of line in a way similar to x86 and adds support for those two features. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/mm/fault.c170
1 files changed, 120 insertions, 50 deletions
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 7e890065cf3..19f2f9498b2 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -105,6 +105,82 @@ static int store_updates_sp(struct pt_regs *regs)
}
return 0;
}
+/*
+ * do_page_fault error handling helpers
+ */
+
+#define MM_FAULT_RETURN 0
+#define MM_FAULT_CONTINUE -1
+#define MM_FAULT_ERR(sig) (sig)
+
+static int out_of_memory(struct pt_regs *regs)
+{
+ /*
+ * We ran out of memory, or some other thing happened to us that made
+ * us unable to handle the page fault gracefully.
+ */
+ up_read(&current->mm->mmap_sem);
+ if (!user_mode(regs))
+ return MM_FAULT_ERR(SIGKILL);
+ pagefault_out_of_memory();
+ return MM_FAULT_RETURN;
+}
+
+static int do_sigbus(struct pt_regs *regs, unsigned long address)
+{
+ siginfo_t info;
+
+ up_read(&current->mm->mmap_sem);
+
+ if (user_mode(regs)) {
+ info.si_signo = SIGBUS;
+ info.si_errno = 0;
+ info.si_code = BUS_ADRERR;
+ info.si_addr = (void __user *)address;
+ force_sig_info(SIGBUS, &info, current);
+ return MM_FAULT_RETURN;
+ }
+ return MM_FAULT_ERR(SIGBUS);
+}
+
+static int mm_fault_error(struct pt_regs *regs, unsigned long addr, int fault)
+{
+ /*
+ * Pagefault was interrupted by SIGKILL. We have no reason to
+ * continue the pagefault.
+ */
+ if (fatal_signal_pending(current)) {
+ /*
+ * If we have retry set, the mmap semaphore will have
+ * alrady been released in __lock_page_or_retry(). Else
+ * we release it now.
+ */
+ if (!(fault & VM_FAULT_RETRY))
+ up_read(&current->mm->mmap_sem);
+ /* Coming from kernel, we need to deal with uaccess fixups */
+ if (user_mode(regs))
+ return MM_FAULT_RETURN;
+ return MM_FAULT_ERR(SIGKILL);
+ }
+
+ /* No fault: be happy */
+ if (!(fault & VM_FAULT_ERROR))
+ return MM_FAULT_CONTINUE;
+
+ /* Out of memory */
+ if (fault & VM_FAULT_OOM)
+ return out_of_memory(regs);
+
+ /* Bus error. x86 handles HWPOISON here, we'll add this if/when
+ * we support the feature in HW
+ */
+ if (fault & VM_FAULT_SIGBUS)
+ return do_sigbus(regs, addr);
+
+ /* We don't understand the fault code, this is fatal */
+ BUG();
+ return MM_FAULT_CONTINUE;
+}
/*
* For 600- and 800-family processors, the error_code parameter is DSISR
@@ -124,11 +200,12 @@ int __kprobes do_page_fault(struct pt_regs *regs, unsigned long address,
{
struct vm_area_struct * vma;
struct mm_struct *mm = current->mm;
- siginfo_t info;
+ unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
int code = SEGV_MAPERR;
- int is_write = 0, ret;
+ int is_write = 0;
int trap = TRAP(regs);
int is_exec = trap == 0x400;
+ int fault;
#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE))
/*
@@ -145,6 +222,9 @@ int __kprobes do_page_fault(struct pt_regs *regs, unsigned long address,
is_write = error_code & ESR_DST;
#endif /* CONFIG_4xx || CONFIG_BOOKE */
+ if (is_write)
+ flags |= FAULT_FLAG_WRITE;
+
#ifdef CONFIG_PPC_ICSWX
/*
* we need to do this early because this "data storage
@@ -152,13 +232,11 @@ int __kprobes do_page_fault(struct pt_regs *regs, unsigned long address,
* look at it
*/
if (error_code & ICSWX_DSI_UCT) {
- int ret;
-
- ret = acop_handle_fault(regs, address, error_code);
- if (ret)
- return ret;
+ int rc = acop_handle_fault(regs, address, error_code);
+ if (rc)
+ return rc;
}
-#endif
+#endif /* CONFIG_PPC_ICSWX */
if (notify_page_fault(regs))
return 0;
@@ -216,6 +294,7 @@ int __kprobes do_page_fault(struct pt_regs *regs, unsigned long address,
if (!user_mode(regs) && !search_exception_tables(regs->nip))
goto bad_area_nosemaphore;
+retry:
down_read(&mm->mmap_sem);
} else {
/*
@@ -338,30 +417,43 @@ good_area:
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
- ret = handle_mm_fault(mm, vma, address, is_write ? FAULT_FLAG_WRITE : 0);
- if (unlikely(ret & VM_FAULT_ERROR)) {
- if (ret & VM_FAULT_OOM)
- goto out_of_memory;
- else if (ret & VM_FAULT_SIGBUS)
- goto do_sigbus;
- BUG();
+ fault = handle_mm_fault(mm, vma, address, flags);
+ if (unlikely(fault & (VM_FAULT_RETRY|VM_FAULT_ERROR))) {
+ int rc = mm_fault_error(regs, address, fault);
+ if (rc >= MM_FAULT_RETURN)
+ return rc;
}
- if (ret & VM_FAULT_MAJOR) {
- current->maj_flt++;
- perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1,
- regs, address);
+
+ /*
+ * Major/minor page fault accounting is only done on the
+ * initial attempt. If we go through a retry, it is extremely
+ * likely that the page will be found in page cache at that point.
+ */
+ if (flags & FAULT_FLAG_ALLOW_RETRY) {
+ if (fault & VM_FAULT_MAJOR) {
+ current->maj_flt++;
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1,
+ regs, address);
#ifdef CONFIG_PPC_SMLPAR
- if (firmware_has_feature(FW_FEATURE_CMO)) {
- preempt_disable();
- get_lppaca()->page_ins += (1 << PAGE_FACTOR);
- preempt_enable();
+ if (firmware_has_feature(FW_FEATURE_CMO)) {
+ preempt_disable();
+ get_lppaca()->page_ins += (1 << PAGE_FACTOR);
+ preempt_enable();
+ }
+#endif /* CONFIG_PPC_SMLPAR */
+ } else {
+ current->min_flt++;
+ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1,
+ regs, address);
+ }
+ if (fault & VM_FAULT_RETRY) {
+ /* Clear FAULT_FLAG_ALLOW_RETRY to avoid any risk
+ * of starvation. */
+ flags &= ~FAULT_FLAG_ALLOW_RETRY;
+ goto retry;
}
-#endif
- } else {
- current->min_flt++;
- perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1,
- regs, address);
}
+
up_read(&mm->mmap_sem);
return 0;
@@ -382,28 +474,6 @@ bad_area_nosemaphore:
return SIGSEGV;
-/*
- * We ran out of memory, or some other thing happened to us that made
- * us unable to handle the page fault gracefully.
- */
-out_of_memory:
- up_read(&mm->mmap_sem);
- if (!user_mode(regs))
- return SIGKILL;
- pagefault_out_of_memory();
- return 0;
-
-do_sigbus:
- up_read(&mm->mmap_sem);
- if (user_mode(regs)) {
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRERR;
- info.si_addr = (void __user *)address;
- force_sig_info(SIGBUS, &info, current);
- return 0;
- }
- return SIGBUS;
}
/*