Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754134AbXJALm5 (ORCPT ); Mon, 1 Oct 2007 07:42:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751808AbXJALmi (ORCPT ); Mon, 1 Oct 2007 07:42:38 -0400 Received: from agave.telenet-ops.be ([195.130.137.77]:60418 "EHLO agave.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751516AbXJALmg (ORCPT ); Mon, 1 Oct 2007 07:42:36 -0400 Date: Mon, 1 Oct 2007 13:42:34 +0200 (CEST) From: Geert Uytterhoeven To: veerasena reddy cc: linux-mips , "linux-kernel.org" Subject: Re: linux cache routines for Write-back cache policy on MIPS24KE In-Reply-To: <302271.86305.qm@web8404.mail.in.yahoo.com> Message-ID: References: <302271.86305.qm@web8404.mail.in.yahoo.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1646 Lines: 51 On Mon, 1 Oct 2007, veerasena reddy wrote: > In linux-2.6.18 (for MIPS24KE processor): > suppose if i want to do flush only then which API i > should use? `flush' is fuzzy terminology: some people mean invalidate, others mean write back, others mean both. > Similarly, if i want to do invalidation only which API > i should use? dma_cache_inv(). > --- Geert Uytterhoeven wrote: > > > On Mon, 1 Oct 2007, veerasena reddy wrote: > > > I have ported Linux-2.6.18 kernel on MIPS24KE > > > processor. I am using write back cache policy. > > > > > > Could you please guide me under what cases the > > below > > > cache API's are being used: > > > - dma_cache_wback_inv() : Could you explain what > > > exactly this function does > > > > It does both write back and invalidate. > > > > > - dma_cache_wback() : This function write back the > > > cache data to memory > > > - dma_cache_inv : This function invalidate the > > cache > > > tags. so subsequent access will fetch from memory. > > > > Note that 2.6.18 is old. The above functions are > > intended to be removed. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds - 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/