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Thu, 23 Nov 2023 10:07:28 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.9.0-alpha0-1234-gac66594aae-fm-20231122.001-gac66594a MIME-Version: 1.0 Message-Id: In-Reply-To: References: <20231122182419.30633-1-fancer.lancer@gmail.com> <20231122182419.30633-2-fancer.lancer@gmail.com> <8ca730b9-fa8c-46ea-bdc5-158da0f29c3a@app.fastmail.com> Date: Thu, 23 Nov 2023 15:07:09 +0000 From: "Jiaxun Yang" To: "Thomas Bogendoerfer" Cc: "Serge Semin" , "Arnd Bergmann" , "Andrew Morton" , "Mike Rapoport" , "Matthew Wilcox" , "Tiezhu Yang" , "Huacai Chen" , "Yinglu Yang" , "Alexey Malahov" , "Aleksandar Rikalo" , "Aleksandar Rikalo" , "Dragan Mladjenovic" , "Chao-ying Fu" , "Marc Zyngier" , "linux-mips@vger.kernel.org" , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/7] mips: dmi: Fix early remap on MIPS32 Content-Type: text/plain;charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: CF55EC002A X-Stat-Signature: 1ixz6xmq838k1q5ndkasgzfjfbo1sp5k X-Rspam-User: X-HE-Tag: 1700752054-812970 X-HE-Meta: U2FsdGVkX1/i0at8oXjZXmOHw1b9IngTPowXyIhU0HT3XNAPy3kmisicxeX50c1dQo0qzf47UdkuvFhmWGzOkB9RjRmlQSuKf0SNwyTobz9BRvkJVKTbWqBBI/rLNh4dUXnxXxDGm3t0Ty7IDE9GPWsAboWZNVeY056ioaC8T/gfxrscgQzq29j+OOlb3ENLLc1RsJBzQOfQk6HDHonQtR5mgPyi9C4VXo4widObia8bDoes2HNPg/zjYppeSgq2KgpKiYcENqU4uyCeFX+4Y3z74Qla3PNwFMmpY6FdfjeLBu3sX3dWyXW+OoLCJLFhjsIX3v6swpwcekQ46ny4OLSs+sR6uedHWQFpU9FC7W8MLOliUA8jK75FpeJHsWxERDKjnq+3zcZT0z1zOlysxn9goG2rF0XJMGHdY8WxOB9q4bFzwpFP/xILb/FJLIP7OZj075jZ42/rwNPFXBee7Z3DUag/TfHthSUYX78WOijm/a/t98Hf6YU4EzIlF2Yj0t+/c8pyqr8VJ+2vN1x6k6gdObcVaw8cJz7Rj/kyhuMsafRgWnqKSqP4nrdBrdybFWRVmiCzOOBgJANfkp2Ia/hyWListucjj/rclP3bIV5y1Db7oaKUtpdFJCHXKNKM3cLexCnDWYxocXQY8L73hHlhkw1NS+QWDpi3/1X6CxWmMrI9429o62JHICg4JFen4qgrS7e3TgermmATdnmuH8c8wzQXmV6rLX6cl6mP+3peNAg6OtKlJuEfXKvzddrLruDcKBo2flfC7s8YNHGG00tv51PiUuGikEpDYCTmnf+wxSF6pYt5x2lL2jHNcczMW//K7JaK+fZH21ot5YXsbAmoe1z71VDmzSfs6arjYJ22fAmeyW9dvv0jyYz0Ye5+IoiUqaqle1X7RUquf5Hvk+8DubnKiCyfn9+eYQZjp8Lmwvg8k8jQVMqc3e1xxT8+a3IL6g5ER42GiCrzlem sLbI4iMc lXRDUjxlu5cVdLpGLb3UFaCl2Dt6Q8StB7gGWiQNoHmCq+uofLmPt5VMiwBsMDRqrV5UVaFI5DbXvsJTzYcuPeya07GEZFy7AzoESinnUNIyRX9wrCsEna0HFYxmy76FNWiphUWSYvo5t9GoPjZ2R773A8geuqf0uy7RrC+ULGmAJLd2bD6TpLo6aUJ6mHTET5JmpyW9gL7IONZ0pRC3iy8V/ZIoYXaBa79JzqnBc/coHgi0oXiRRFrxrbaofc7RE06TTJIZt/rChOgJlxCHM865rNJ5WpECPCgr9KB0CwKJD43Gd+MWhnHWVmZz7KA/E4xkJCCGLu3M9Ky7UEy2xp21kbA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: =E5=9C=A82023=E5=B9=B411=E6=9C=8823=E6=97=A5=E5=8D=81=E4=B8=80=E6=9C=88 = =E4=B8=8B=E5=8D=8812:29=EF=BC=8CThomas Bogendoerfer=E5=86=99=E9=81=93=EF= =BC=9A > On Thu, Nov 23, 2023 at 12:13:11PM +0000, Jiaxun Yang wrote: >> > Ok. Thanks for the heads up. I'll fix the patch to be using ioremap= () >> > in v2. ioremap_uc() is just an macro-alias of ioremap() on MIPS. >>=20 >> Perhaps we need to fix ioremap_cache so it can give a KSEG1 address? > > KSEG0 ? Ah yes it's KSEG0. > >> AFAIK for Loongson DMI is located at cached memory so using ioremap_uc >> blindly will cause inconsistency. > > why ? Firmware sometimes does not flush those tables from cache back to memory. For Loongson systems (as well as most MTI systems) cache is enabled by firmware. Thanks. > > Thomas. > > --=20 > Crap can work. Given enough thrust pigs will fly, but it's not necessa= rily a > good idea. [ RFC1925, 2= .3 ] --=20 - Jiaxun