linux-kernel - Re: [RFC PATCH 04/10] powerpc/fsl_booke/32: introduce create_tlb

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Message-ID: <bf63f6e1-c74f-8494-5f1f-f4c5a1a671fe@huawei.com>
Date:   Mon, 29 Jul 2019 21:26:12 +0800
From:   Jason Yan <yanaijie@...wei.com>
To:     Christophe Leroy <christophe.leroy@....fr>, <mpe@...erman.id.au>,
        <linuxppc-dev@...ts.ozlabs.org>, <diana.craciun@....com>,
        <benh@...nel.crashing.org>, <paulus@...ba.org>,
        <npiggin@...il.com>, <keescook@...omium.org>,
        <kernel-hardening@...ts.openwall.com>
CC:     <linux-kernel@...r.kernel.org>, <wangkefeng.wang@...wei.com>,
        <yebin10@...wei.com>, <thunder.leizhen@...wei.com>,
        <jingxiangfeng@...wei.com>, <fanchengyang@...wei.com>
Subject: Re: [RFC PATCH 04/10] powerpc/fsl_booke/32: introduce
 create_tlb_entry() helper


On 2019/7/29 19:05, Christophe Leroy wrote:
> 
> 
> Le 17/07/2019 à 10:06, Jason Yan a écrit :
>> Add a new helper create_tlb_entry() to create a tlb entry by the virtual
>> and physical address. This is a preparation to support boot kernel at a
>> randomized address.
>>
>> Signed-off-by: Jason Yan <yanaijie@...wei.com>
>> Cc: Diana Craciun <diana.craciun@....com>
>> Cc: Michael Ellerman <mpe@...erman.id.au>
>> Cc: Christophe Leroy <christophe.leroy@....fr>
>> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
>> Cc: Paul Mackerras <paulus@...ba.org>
>> Cc: Nicholas Piggin <npiggin@...il.com>
>> Cc: Kees Cook <keescook@...omium.org>
>> ---
>>   arch/powerpc/kernel/head_fsl_booke.S | 30 ++++++++++++++++++++++++++++
>>   arch/powerpc/mm/mmu_decl.h           |  1 +
>>   2 files changed, 31 insertions(+)
>>
>> diff --git a/arch/powerpc/kernel/head_fsl_booke.S 
>> b/arch/powerpc/kernel/head_fsl_booke.S
>> index adf0505dbe02..a57d44638031 100644
>> --- a/arch/powerpc/kernel/head_fsl_booke.S
>> +++ b/arch/powerpc/kernel/head_fsl_booke.S
>> @@ -1114,6 +1114,36 @@ __secondary_hold_acknowledge:
>>       .long    -1
>>   #endif
>> +/*
>> + * Create a 64M tlb by address and entry
>> + * r3/r4 - physical address
>> + * r5 - virtual address
>> + * r6 - entry
>> + */
>> +_GLOBAL(create_tlb_entry)
>> +    lis     r7,0x1000               /* Set MAS0(TLBSEL) = 1 */
>> +    rlwimi  r7,r6,16,4,15           /* Setup MAS0 = TLBSEL | ESEL(r6) */
>> +    mtspr   SPRN_MAS0,r7            /* Write MAS0 */
>> +
>> +    lis     r6,(MAS1_VALID|MAS1_IPROT)@h
>> +    ori     r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_64M))@l
>> +    mtspr   SPRN_MAS1,r6            /* Write MAS1 */
>> +
>> +    lis     r6,MAS2_EPN_MASK(BOOK3E_PAGESZ_64M)@h
>> +    ori     r6,r6,MAS2_EPN_MASK(BOOK3E_PAGESZ_64M)@l
>> +    and     r6,r6,r5
>> +    ori    r6,r6,MAS2_M@l
>> +    mtspr   SPRN_MAS2,r6            /* Write MAS2(EPN) */
>> +
>> +    mr      r8,r4
>> +    ori     r8,r8,(MAS3_SW|MAS3_SR|MAS3_SX)
> 
> Could drop the mr r8, r4 and do:
> 
> ori     r8,r4,(MAS3_SW|MAS3_SR|MAS3_SX)
> 

OK, thanks for the suggestion.

>> +    mtspr   SPRN_MAS3,r8            /* Write MAS3(RPN) */
>> +
>> +    tlbwe                           /* Write TLB */
>> +    isync
>> +    sync
>> +    blr
>> +
>>   /*
>>    * Create a tlb entry with the same effective and physical address as
>>    * the tlb entry used by the current running code. But set the TS to 1.
>> diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
>> index 32c1a191c28a..d7737cf97cee 100644
>> --- a/arch/powerpc/mm/mmu_decl.h
>> +++ b/arch/powerpc/mm/mmu_decl.h
>> @@ -142,6 +142,7 @@ extern unsigned long calc_cam_sz(unsigned long 
>> ram, unsigned long virt,
>>   extern void adjust_total_lowmem(void);
>>   extern int switch_to_as1(void);
>>   extern void restore_to_as0(int esel, int offset, void *dt_ptr, int 
>> bootcpu);
>> +extern void create_tlb_entry(phys_addr_t phys, unsigned long virt, 
>> int entry);
> 
> Please please do not add new declarations with the useless 'extern' 
> keyword. See checkpatch report: 
> https://openpower.xyz/job/snowpatch/job/snowpatch-linux-checkpatch/8124//artifact/linux/checkpatch.log 
> 

Will drop all useless 'extern' in this and other patches, thanks.

> 
>>   #endif
>>   extern void loadcam_entry(unsigned int index);
>>   extern void loadcam_multi(int first_idx, int num, int tmp_idx);
>>
> 
> .
>