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a=rsa-sha256; c=simple/simple; d=flygoat.com; s=default; t=1604314078; bh=hxyT1poswWBoJaaTTVRkPcnfH3Dt9A7ZnvVAXTURqp0=; h=Subject:From:To:Cc:References:Date:In-Reply-To:From; b=h6AS1WVvpr4zgF+1O2oE8n1L+6ASF9u3h/KFM+mQC+MEqIIySpIIV0LLb2iholfXC 4Y6l6XG4rA4zobYzSZ3wNzmLApWsZ6MUAsL/Wfa6TGcumoZWVWiH/+RqxMF2OkEpRR 0EcnrUrN3kywYLT+DhJXR3p+bzjN+tE7UPxwIbww= Subject: Re: [PATCH 1/6] MIPS: Loongson64: Do not write the read only field LPA of CP0_CONFIG3 From: Jiaxun Yang To: Tiezhu Yang , Thomas Bogendoerfer , Huacai Chen Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, Xuefeng Li References: <1603958581-4723-1-git-send-email-yangtiezhu@loongson.cn> <1603958581-4723-2-git-send-email-yangtiezhu@loongson.cn> <7306f77f-b70a-862d-b4c5-d8f20102dc62@loongson.cn> Message-ID: Date: Mon, 2 Nov 2020 18:47:50 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 6E1C041E24 X-Spamd-Result: default: False [3.90 / 10.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; RECEIVED_SPAMHAUS_XBL(3.00)[113.52.132.214:received]; RECEIVED_SPAMHAUS_CSS(1.00)[113.52.132.214:received]; R_DKIM_ALLOW(0.00)[flygoat.com:s=default]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; R_SPF_SOFTFAIL(0.00)[~all]; RCPT_COUNT_FIVE(0.00)[6]; ML_SERVERS(-3.10)[148.251.23.173]; DKIM_TRACE(0.00)[flygoat.com:+]; DMARC_POLICY_ALLOW(0.00)[flygoat.com,none]; DMARC_POLICY_ALLOW_WITH_FAILURES(0.00)[]; RCVD_NO_TLS_LAST(0.10)[]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:24940, ipnet:148.251.0.0/16, country:DE]; RCVD_COUNT_TWO(0.00)[2]; MID_RHS_MATCH_FROM(0.00)[]; HFILTER_HELO_BAREIP(3.00)[148.251.23.173,1] X-Rspamd-Server: mail20.mymailcheap.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 在 2020/10/30 20:13, Jiaxun Yang 写道: > > > 在 2020/10/30 14:22, Tiezhu Yang 写道: >> On 10/30/2020 12:00 PM, Jiaxun Yang wrote: >>> >>> >>> 在 2020/10/29 16:02, Tiezhu Yang 写道: >>>> The field LPA of CP0_CONFIG3 register is read only for Loongson64, >>>> so the >>>> write operations are meaningless, remove them. >>>> >>>> Signed-off-by: Tiezhu Yang >>>> --- >>>>   arch/mips/include/asm/mach-loongson64/kernel-entry-init.h | 8 >>>> -------- >>>>   arch/mips/loongson64/numa.c | 3 --- >>>>   2 files changed, 11 deletions(-) >>> Hi Tiezhu, >>> >>> AFAIK it's not read only on 3A1000. >>> Have you check with hardware guys? >> >> Hi Jiaxun, >> >> Yes, I checked it before send this patch,  the field LPA of CP0_CONFIG3 >> on 3A1000 is also read only,  we can see the related description in the >> chapter 3.22 of Loongson_3A1000_cpu_user_2. > > On page 36, it said: > "能否写ELPA位依赖于Config3寄存器的LPA域 。当Config3的LPA位为0时， > PageGrain的ELPA位被置位。" > > Don't know if it matters. > > @Huacai, Any comments? Do you know why it exists here? Confirmed by another rev of the manual that it's only a tip for implementer. I guess my assumption was wrong. LPA should be read-only though..... Thanks - Jiaxun > > Thanks > > - Jiaxun