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<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>LKML: Zi Yan: [PATCH v4 1/2] Introduce cpu_icache_is_aliasing() across all architectures</title><link href="/css/message.css" rel="stylesheet" type="text/css" /><link href="/css/wrap.css" rel="alternate stylesheet" type="text/css" title="wrap" /><link href="/css/nowrap.css" rel="stylesheet" type="text/css" title="nowrap" /><link href="/favicon.ico" rel="shortcut icon" /><script src="/js/simple-calendar.js" type="text/javascript"></script><script src="/js/styleswitcher.js" type="text/javascript"></script><link rel="alternate" type="application/rss+xml" title="lkml.org : last 100 messages" href="/rss.php" /><link rel="alternate" type="application/rss+xml" title="lkml.org : last messages by Zi Yan" href="/groupie.php?aid=" /><script> var _paq = window._paq = window._paq || []; /* tracker methods like "setCustomDimension" should be called before "trackPageView" */ _paq.push(["setDoNotTrack", true]); _paq.push(["disableCookies"]); _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="//m.lkml.org/"; _paq.push(['setTrackerUrl', u+'matomo.php']); _paq.push(['setSiteId', '1']); var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; g.async=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s); })(); </script></head><body onload="es.jasper.simpleCalendar.init();" itemscope="itemscope" itemtype="http://schema.org/BlogPosting"><table border="0" cellpadding="0" cellspacing="0"><tr><td width="180" align="center"><a href="/"><img style="border:0;width:135px;height:32px" src="/images/toprowlk.gif" alt="lkml.org" /></a></td><td width="32">聽</td><td class="nb"><div><a class="nb" href="/lkml"> [lkml]</a> 聽 <a class="nb" href="/lkml/2024"> [2024]</a> 聽 <a class="nb" href="/lkml/2024/12"> [Dec]</a> 聽 <a class="nb" href="/lkml/2024/12/7"> [7]</a> 聽 <a class="nb" href="/lkml/last100"> [last100]</a> 聽 <a href="/rss.php"><img src="/images/rss-or.gif" border="0" alt="RSS Feed" /></a></div><div>Views: <a href="#" class="nowrap" onclick="setActiveStyleSheet('wrap');return false;">[wrap]</a><a href="#" class="wrap" onclick="setActiveStyleSheet('nowrap');return false;">[no wrap]</a> 聽 <a class="nb" href="/lkml/mheaders/2024/12/7/297" onclick="this.href='/lkml/headers'+'/2024/12/7/297';">[headers]</a>聽 <a href="/lkml/bounce/2024/12/7/297">[forward]</a>聽 </div></td><td width="32">聽</td></tr><tr><td valign="top"><div class="es-jasper-simpleCalendar" baseurl="/lkml/"></div><div class="threadlist">Messages in this thread</div><ul class="threadlist"><li class="root"><a href="/lkml/2024/12/7/297">First message in thread</a></li><li class="origin"><a href="/lkml/2024/12/7/298">Zi Yan</a><ul><li><a href="/lkml/2024/12/7/298">Zi Yan</a><ul><li><a href="/lkml/2024/12/9/1556">Vlastimil Babka</a><ul><li><a href="/lkml/2024/12/9/1557">Zi Yan</a></li></ul></li></ul></li><li><a href="/lkml/2024/12/9/1553">Vlastimil Babka</a></li></ul></li></ul><div class="threadlist">Patch in this message</div><ul class="threadlist"><li><a href="/lkml/diff/2024/12/7/297/1">Get diff 1</a></li></ul></td><td width="32" rowspan="2" class="c" valign="top"><img src="/images/icornerl.gif" width="32" height="32" alt="/" /></td><td class="c" rowspan="2" valign="top" style="padding-top: 1em"><table><tr><td><table><tr><td class="lp">From</td><td class="rp" itemprop="author">Zi Yan <></td></tr><tr><td class="lp">Subject</td><td class="rp" itemprop="name">[PATCH v4 1/2] Introduce cpu_icache_is_aliasing() across all architectures</td></tr><tr><td class="lp">Date</td><td class="rp" itemprop="datePublished">Sat, 7 Dec 2024 12:16:30 -0500</td></tr></table></td><td></td></tr></table><pre itemprop="articleBody">In commit eacd0e950dc2 ("ARC: [mm] Lazy D-cache flush (non aliasing<br />VIPT)"), arc adds the need to flush dcache to make icache see the code<br />page change. This also requires special handling for<br />clear_user_(high)page(). Introduce cpu_icache_is_aliasing() to make<br />MM code query special clear_user_(high)page() easier. This will be used<br />by the following commit.<br /><br />Suggested-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com><br />Signed-off-by: Zi Yan <ziy@nvidia.com><br />Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com><br />---<br /> arch/arc/Kconfig | 1 +<br /> arch/arc/include/asm/cachetype.h | 8 ++++++++<br /> include/linux/cacheinfo.h | 6 ++++++<br /> 3 files changed, 15 insertions(+)<br /> create mode 100644 arch/arc/include/asm/cachetype.h<br /><br />diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig<br />index 5b2488142041..e96935373796 100644<br />--- a/arch/arc/Kconfig<br />+++ b/arch/arc/Kconfig<br />@@ -6,6 +6,7 @@<br /> config ARC<br /> def_bool y<br /> select ARC_TIMERS<br />+ select ARCH_HAS_CPU_CACHE_ALIASING<br /> select ARCH_HAS_CACHE_LINE_SIZE<br /> select ARCH_HAS_DEBUG_VM_PGTABLE<br /> select ARCH_HAS_DMA_PREP_COHERENT<br />diff --git a/arch/arc/include/asm/cachetype.h b/arch/arc/include/asm/cachetype.h<br />new file mode 100644<br />index 000000000000..acd3b6cb4bf5<br />--- /dev/null<br />+++ b/arch/arc/include/asm/cachetype.h<br />@@ -0,0 +1,8 @@<br />+/* SPDX-License-Identifier: GPL-2.0 */<br />+#ifndef __ASM_ARC_CACHETYPE_H<br />+#define __ASM_ARC_CACHETYPE_H<br />+<br />+#define cpu_dcache_is_aliasing() false<br />+#define cpu_icache_is_aliasing() true<br />+<br />+#endif<br />diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h<br />index 108060612bb8..7ad736538649 100644<br />--- a/include/linux/cacheinfo.h<br />+++ b/include/linux/cacheinfo.h<br />@@ -155,8 +155,14 @@ static inline int get_cpu_cacheinfo_id(int cpu, int level)<br /> <br /> #ifndef CONFIG_ARCH_HAS_CPU_CACHE_ALIASING<br /> #define cpu_dcache_is_aliasing() false<br />+#define cpu_icache_is_aliasing() cpu_dcache_is_aliasing()<br /> #else<br /> #include <asm/cachetype.h><br />+<br />+#ifndef cpu_icache_is_aliasing<br />+#define cpu_icache_is_aliasing() cpu_dcache_is_aliasing()<br />+#endif<br />+<br /> #endif<br /> <br /> #endif /* _LINUX_CACHEINFO_H */<br />-- <br />2.45.2<br /><br /></pre></td><td width="32" rowspan="2" class="c" valign="top"><img src="/images/icornerr.gif" width="32" height="32" alt="\" /></td></tr><tr><td align="right" valign="bottom"> 聽 </td></tr><tr><td align="right" valign="bottom">聽</td><td class="c" valign="bottom" style="padding-bottom: 0px"><img src="/images/bcornerl.gif" width="32" height="32" alt="\" /></td><td class="c">聽</td><td class="c" valign="bottom" style="padding-bottom: 0px"><img src="/images/bcornerr.gif" width="32" height="32" alt="/" /></td></tr><tr><td align="right" valign="top" colspan="2"> 聽 </td><td class="lm">Last update: 2024-12-07 18:17 聽聽 [from the cache]<br />漏2003-2020 <a href="http://blog.jasper.es/"><span itemprop="editor">Jasper Spaans</span></a>|hosted at <a href="https://www.digitalocean.com/?refcode=9a8e99d24cf9">Digital Ocean</a> and my Meterkast|<a href="http://blog.jasper.es/categories.html#lkml-ref">Read the blog</a></td><td>聽</td></tr></table><script language="javascript" src="/js/styleswitcher.js" type="text/javascript"></script></body></html>