Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754724Ab2HGNV0 (ORCPT ); Tue, 7 Aug 2012 09:21:26 -0400 Received: from mx1.redhat.com ([209.132.183.28]:9976 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753415Ab2HGNVX (ORCPT ); Tue, 7 Aug 2012 09:21:23 -0400 From: Jiri Olsa To: linux-kernel@vger.kernel.org Cc: Arnaldo Carvalho de Melo , Arun Sharma , Benjamin Redelings , Corey Ashford , Cyrill Gorcunov , "Frank Ch. Eigler" , Ingo Molnar , Jiri Olsa , Masami Hiramatsu , Paul Mackerras , Peter Zijlstra , Robert Richter , Stephane Eranian , Tom Zanussi , Ulrich Drepper Subject: [PATCH 03/12] perf: Factor __output_copy to be usable with specific copy function Date: Tue, 7 Aug 2012 15:20:38 +0200 Message-Id: <1344345647-11536-4-git-send-email-jolsa@redhat.com> In-Reply-To: <1344345647-11536-1-git-send-email-jolsa@redhat.com> References: <1344345647-11536-1-git-send-email-jolsa@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5712 Lines: 169 From: Frederic Weisbecker Adding a generic way to use __output_copy function with specific copy function via DEFINE_PERF_OUTPUT_COPY macro. Using this to add new __output_copy_user function, that provides output copy from user pointers. For x86 the copy_from_user_nmi function is used and __copy_from_user_inatomic for the rest of the architectures. This new function will be used in user stack dump on sample, coming in next patches. Signed-off-by: Frederic Weisbecker Cc: Arnaldo Carvalho de Melo Cc: Arun Sharma Cc: Benjamin Redelings Cc: Corey Ashford Cc: Cyrill Gorcunov Cc: Frank Ch. Eigler Cc: Ingo Molnar Cc: Jiri Olsa Cc: Masami Hiramatsu Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Robert Richter Cc: Stephane Eranian Cc: Tom Zanussi Cc: Ulrich Drepper Signed-off-by: Jiri Olsa --- arch/x86/include/asm/perf_event.h | 2 ++ include/linux/perf_event.h | 2 +- kernel/events/internal.h | 62 ++++++++++++++++++++++++++------------- kernel/events/ring_buffer.c | 4 +-- 4 files changed, 46 insertions(+), 24 deletions(-) diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h index cb4e43b..4fabcdf 100644 --- a/arch/x86/include/asm/perf_event.h +++ b/arch/x86/include/asm/perf_event.h @@ -262,4 +262,6 @@ static inline void perf_check_microcode(void) { } static inline void amd_pmu_disable_virt(void) { } #endif +#define arch_perf_out_copy_user copy_from_user_nmi + #endif /* _ASM_X86_PERF_EVENT_H */ diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 3d4d847..d41394a 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1319,7 +1319,7 @@ static inline bool has_branch_stack(struct perf_event *event) extern int perf_output_begin(struct perf_output_handle *handle, struct perf_event *event, unsigned int size); extern void perf_output_end(struct perf_output_handle *handle); -extern void perf_output_copy(struct perf_output_handle *handle, +extern unsigned int perf_output_copy(struct perf_output_handle *handle, const void *buf, unsigned int len); extern int perf_swevent_get_recursion_context(void); extern void perf_swevent_put_recursion_context(int rctx); diff --git a/kernel/events/internal.h b/kernel/events/internal.h index a096c19..7fd5408 100644 --- a/kernel/events/internal.h +++ b/kernel/events/internal.h @@ -2,6 +2,7 @@ #define _KERNEL_EVENTS_INTERNAL_H #include +#include /* Buffer handling */ @@ -76,30 +77,49 @@ static inline unsigned long perf_data_size(struct ring_buffer *rb) return rb->nr_pages << (PAGE_SHIFT + page_order(rb)); } -static inline void -__output_copy(struct perf_output_handle *handle, - const void *buf, unsigned int len) +#define DEFINE_OUTPUT_COPY(func_name, memcpy_func) \ +static inline unsigned int \ +func_name(struct perf_output_handle *handle, \ + const void *buf, unsigned int len) \ +{ \ + unsigned long size, written; \ + \ + do { \ + size = min_t(unsigned long, handle->size, len); \ + \ + written = memcpy_func(handle->addr, buf, size); \ + \ + len -= written; \ + handle->addr += written; \ + buf += written; \ + handle->size -= written; \ + if (!handle->size) { \ + struct ring_buffer *rb = handle->rb; \ + \ + handle->page++; \ + handle->page &= rb->nr_pages - 1; \ + handle->addr = rb->data_pages[handle->page]; \ + handle->size = PAGE_SIZE << page_order(rb); \ + } \ + } while (len && written == size); \ + \ + return len; \ +} + +static inline int memcpy_common(void *dst, const void *src, size_t n) { - do { - unsigned long size = min_t(unsigned long, handle->size, len); - - memcpy(handle->addr, buf, size); - - len -= size; - handle->addr += size; - buf += size; - handle->size -= size; - if (!handle->size) { - struct ring_buffer *rb = handle->rb; - - handle->page++; - handle->page &= rb->nr_pages - 1; - handle->addr = rb->data_pages[handle->page]; - handle->size = PAGE_SIZE << page_order(rb); - } - } while (len); + memcpy(dst, src, n); + return n; } +DEFINE_OUTPUT_COPY(__output_copy, memcpy_common) + +#ifndef arch_perf_out_copy_user +#define arch_perf_out_copy_user __copy_from_user_inatomic +#endif + +DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user) + /* Callchain handling */ extern struct perf_callchain_entry * perf_callchain(struct perf_event *event, struct pt_regs *regs); diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index 6ddaba4..b4c2ad3 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -182,10 +182,10 @@ out: return -ENOSPC; } -void perf_output_copy(struct perf_output_handle *handle, +unsigned int perf_output_copy(struct perf_output_handle *handle, const void *buf, unsigned int len) { - __output_copy(handle, buf, len); + return __output_copy(handle, buf, len); } void perf_output_end(struct perf_output_handle *handle) -- 1.7.11.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/