From patchwork Fri Mar 24 16:13:18 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 9643229 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id F3C6160327 for ; Fri, 24 Mar 2017 16:16:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E556E2521E for ; Fri, 24 Mar 2017 16:16:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D97B4262FF; Fri, 24 Mar 2017 16:16:09 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 731532521E for ; Fri, 24 Mar 2017 16:16:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966218AbdCXQPk (ORCPT ); Fri, 24 Mar 2017 12:15:40 -0400 Received: from bombadil.infradead.org ([65.50.211.133]:60341 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966141AbdCXQNp (ORCPT ); Fri, 24 Mar 2017 12:13:45 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=4PABV1MqcSsOm2Nv3z32v5KKzexZdPkcccPIjbAFZzQ=; b=eXEPm9CueKvrnH+4AyRhKDQVs 0QbTu6ZIyT0CJ7W4c2/S/RkOakQq8d2qYKce3tlqf+cV2wZJWvkN8JMwKLLSOwSbTZ5DQsZ4Wad+C 7VApnlC35+f2uBQH1RP4mOqCjMlq+MytlfRZ0Rgw8OFmSlKCbwuK1f9a+UyBRPdwzMhmmInAIL/NQ fp06tHYjIojEsD2MatRYBVLm7+lWZksXDoD/f4YLgsOjjZyRUPeiLGLy2XjyX+DtnAwh9Mg3fDq7l aNsTV7r4SZZmvpalF2ZfLPR/K4bQhg6Vqa8Uhomlkvt3+DU/gKOb7vhXIZJHragUl98q66bAoipIf tVm1kSfKA==; Received: from willy by bombadil.infradead.org with local (Exim 4.87 #1 (Red Hat Linux)) id 1crRqK-0004vZ-Qg; Fri, 24 Mar 2017 16:13:36 +0000 From: Matthew Wilcox To: linux-kernel@vger.kernel.org Cc: linux-fbdev@vger.kernel.org, linux-arch@vger.kernel.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, linux-mips@linux-mips.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, Minchan Kim , Matthew Wilcox Subject: [PATCH v3 7/7] vga: Optimise console scrolling Date: Fri, 24 Mar 2017 09:13:18 -0700 Message-Id: <20170324161318.18718-8-willy@infradead.org> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170324161318.18718-1-willy@infradead.org> References: <20170324161318.18718-1-willy@infradead.org> Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Matthew Wilcox Where possible, call memset16(), memmove() or memcpy() instead of using open-coded loops. If an architecture doesn't define VT_BUF_HAVE_RW, we can do that from the generic code. For the architectures which do have special RW routines, usually we can do the special thing (pointer test or byteswap) once (and then use a mem* call) instead of each time around a loop. Alpha is the only architecture missing a scr_memmovew() definition (because it's non-trivial to write). I don't like the calling convention that uses a byte count instead of a count of u16s, but it's a little late to change that. Reduces code size of fbcon.o by almost 400 bytes on my laptop build. Signed-off-by: Matthew Wilcox --- arch/mips/include/asm/vga.h | 6 ++++++ arch/powerpc/include/asm/vga.h | 8 ++++++++ arch/sparc/include/asm/vga.h | 24 ++++++++++++++++++++++++ include/linux/vt_buffer.h | 12 ++++++++++++ 4 files changed, 50 insertions(+) diff --git a/arch/mips/include/asm/vga.h b/arch/mips/include/asm/vga.h index f82c83749a08..7510f406e1e1 100644 --- a/arch/mips/include/asm/vga.h +++ b/arch/mips/include/asm/vga.h @@ -40,9 +40,15 @@ static inline u16 scr_readw(volatile const u16 *addr) return le16_to_cpu(*addr); } +static inline void scr_memsetw(u16 *s, u16 v, unsigned int count) +{ + memset16(s, cpu_to_le16(v), count / 2); +} + #define scr_memcpyw(d, s, c) memcpy(d, s, c) #define scr_memmovew(d, s, c) memmove(d, s, c) #define VT_BUF_HAVE_MEMCPYW #define VT_BUF_HAVE_MEMMOVEW +#define VT_BUF_HAVE_MEMSETW #endif /* _ASM_VGA_H */ diff --git a/arch/powerpc/include/asm/vga.h b/arch/powerpc/include/asm/vga.h index ab3acd2f2786..7a7b541b7493 100644 --- a/arch/powerpc/include/asm/vga.h +++ b/arch/powerpc/include/asm/vga.h @@ -33,8 +33,16 @@ static inline u16 scr_readw(volatile const u16 *addr) return le16_to_cpu(*addr); } +#define VT_BUF_HAVE_MEMSETW +static inline void scr_memsetw(u16 *s, u16 v, unsigned int n) +{ + memset16(s, cpu_to_le16(v), n / 2); +} + #define VT_BUF_HAVE_MEMCPYW +#define VT_BUF_HAVE_MEMMOVEW #define scr_memcpyw memcpy +#define scr_memmovew memmove #endif /* !CONFIG_VGA_CONSOLE && !CONFIG_MDA_CONSOLE */ diff --git a/arch/sparc/include/asm/vga.h b/arch/sparc/include/asm/vga.h index ec0e9967d93d..1fab92b110d9 100644 --- a/arch/sparc/include/asm/vga.h +++ b/arch/sparc/include/asm/vga.h @@ -11,6 +11,9 @@ #include #define VT_BUF_HAVE_RW +#define VT_BUF_HAVE_MEMSETW +#define VT_BUF_HAVE_MEMCPYW +#define VT_BUF_HAVE_MEMMOVEW #undef scr_writew #undef scr_readw @@ -29,6 +32,27 @@ static inline u16 scr_readw(const u16 *addr) return *addr; } +static inline void scr_memsetw(u16 *p, u16 v, unsigned int n) +{ + BUG_ON((long) p >= 0); + + memset16(s, cpu_to_le16(v), n / 2); +} + +static inline void scr_memcpyw(u16 *d, u16 *s, unsigned int n) +{ + BUG_ON((long) d >= 0); + + memcpy(d, s, n); +} + +static inline void scr_memmovew(u16 *d, u16 *s, unsigned int n) +{ + BUG_ON((long) d >= 0); + + memmove(d, s, n); +} + #define VGA_MAP_MEM(x,s) (x) #endif diff --git a/include/linux/vt_buffer.h b/include/linux/vt_buffer.h index f38c10ba3ff5..31b92fcd8f03 100644 --- a/include/linux/vt_buffer.h +++ b/include/linux/vt_buffer.h @@ -26,24 +26,33 @@ #ifndef VT_BUF_HAVE_MEMSETW static inline void scr_memsetw(u16 *s, u16 c, unsigned int count) { +#ifdef VT_BUF_HAVE_RW count /= 2; while (count--) scr_writew(c, s++); +#else + memset16(s, c, count / 2); +#endif } #endif #ifndef VT_BUF_HAVE_MEMCPYW static inline void scr_memcpyw(u16 *d, const u16 *s, unsigned int count) { +#ifdef VT_BUF_HAVE_RW count /= 2; while (count--) scr_writew(scr_readw(s++), d++); +#else + memcpy(d, s, count); +#endif } #endif #ifndef VT_BUF_HAVE_MEMMOVEW static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count) { +#ifdef VT_BUF_HAVE_RW if (d < s) scr_memcpyw(d, s, count); else { @@ -53,6 +62,9 @@ static inline void scr_memmovew(u16 *d, const u16 *s, unsigned int count) while (count--) scr_writew(scr_readw(--s), --d); } +#else + memmove(d, s, count); +#endif } #endif