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Message-ID: <Z7Plpr3e3hdQJieG@U-V2QX163P-2032.local> Date: Tue, 18 Feb 2025 09:43:02 +0800 From: YinFengwei <fengwei_yin@...ux.alibaba.com> To: robin.murphy@....com, will@...nel.org, mark.rutland@....com, linux-arm-kernel@...ts.infradead.org, linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org Cc: jie.li.linux@...ux.alibaba.com Subject: Re: [PATCH] perf/arm-cmn: don't claim resource during ioremap() for CMN700 with ACPI On Tue, Feb 18, 2025 at 09:21:11AM +0800, Yin Fengwei wrote: > Currently, arm-cmn PMU driver assumes ACPI claim resource > for CMN600 + ACPI. But with CMN700 + ACPI, the device probe > failed because of resource claim failes when ioremap() is > called: > [ 10.837300] arm-cmn ARMHC700:00: error -EBUSY: can't request region for resource [mem 0x40000000-0x4fffffff] > [ 10.847310] arm-cmn ARMHC700:00: probe with driver arm-cmn failed with error -16 > [ 10.854726] arm-cmn ARMHC700:02: error -EBUSY: can't request region for resource [mem 0x40040000000-0x4004fffffff] > [ 10.865085] arm-cmn ARMHC700:02: probe with driver arm-cmn failed with error -16 > > Let CMN700 + ACPI do same as CMN600 + ACPI to allow CMN700 > work in ACPI env. > > Signed-off-by: Yin Fengwei <fengwei_yin@...ux.alibaba.com> > --- > I am also wondering whether we could just drop the CMN600 part id > check here if ACPI companion device claimed the resource? > Sorry. Just saw the link https://lore.kernel.org/all/1676535470-120560-1-git-send-email-renyu.zj@linux.alibaba.com/ after I hit send button. May continue the discussion there. Thanks. Regards Yin, Fengwei
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