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Date: Fri, 22 Jul 2022 14:58:12 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: WANG Xuerui <kernel@...0n.name>,
Jiaxun Yang <jiaxun.yang@...goat.com>,
loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
Jianmin Lv <lvjianmin@...ngson.cn>
Subject: Re: [PATCH v2] LoongArch: Remove LOONGARCH_CPUCFG48 and some CSR
definitions
On 07/20/2022 04:32 PM, Tiezhu Yang wrote:
> According to the configuration information accessible by the CPUCFG
> instruction [1] and the Overview of Control and Status Registers [2],
> we can not see the descriptions about LOONGARCH_CPUCFG48 (0x30),
> LOONGARCH_CSR_PRID (0xc0), LOONGARCH_CSR_MCSR* (0xc0 ~ 0xff) and
> LOONGARCH_CSR_UCAWIN* (0x100 ~ 0x109), they are not used in the
> current kernel code.
>
> LOONGARCH_CPUCFG48 may be used only in the firmware layer, it should
> not be used in the future for kernel developers, remove the related
> LOONGARCH_CPUCFG48 definitions.
>
> LOONGARCH_CSR_MCSR* is shadow of LOONGARCH_CPUCFG*, no need to access
> LOONGARCH_CSR_MCSR* and LOONGARCH_CSR_PRID through CSR instruction,
> use CPUCFG instruction to access LOONGARCH_CPUCFG* is enough, so also
> remove LOONGARCH_CSR_MCSR* and LOONGARCH_CSR_PRID definitions.
>
> LOONGARCH_CSR_UCAWIN* may be not implemented in hardware, use CSR
> instruction to access them is meaningless, so also remove the related
> LOONGARCH_CSR_UCAWIN* definitions.
>
> The intention of this patch is to keep consistent between the code and
> the manual.
>
> [1] https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#the-configuration-information-accessible-by-the-cpucfg-instruction
> [2] https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#table-overview-of-control-and-status-registers
>
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
>
> v2:
> -- Remove LOONGARCH_CSR_PRID and LOONGARCH_CSR_UCAWIN*
> -- Modify the patch subject and update the commit message
>
> arch/loongarch/include/asm/loongarch.h | 229 ---------------------------------
> 1 file changed, 229 deletions(-)
>
> diff --git a/arch/loongarch/include/asm/loongarch.h b/arch/loongarch/include/asm/loongarch.h
> index 3ba4f7e..43755f9 100644
> --- a/arch/loongarch/include/asm/loongarch.h
> +++ b/arch/loongarch/include/asm/loongarch.h
> @@ -218,12 +218,6 @@ static inline u32 read_cpucfg(u32 reg)
> #define CPUCFG20_L3_SETS 16
> #define CPUCFG20_L3_SIZE 24
>
> -#define LOONGARCH_CPUCFG48 0x30
> -#define CPUCFG48_MCSR_LCK BIT(0)
> -#define CPUCFG48_NAP_EN BIT(1)
> -#define CPUCFG48_VFPU_CG BIT(2)
> -#define CPUCFG48_RAM_CG BIT(3)
> -
> #ifndef __ASSEMBLY__
>
> /* CSR */
> @@ -728,229 +722,6 @@ static __always_inline void iocsr_write64(u64 val, u32 reg)
>
> #define LOONGARCH_CSR_CTAG 0x98 /* TagLo + TagHi */
>
> -#define LOONGARCH_CSR_PRID 0xc0
> -
> -/* Shadow MCSR : 0xc0 ~ 0xff */
> -#define LOONGARCH_CSR_MCSR0 0xc0 /* CPUCFG0 and CPUCFG1 */
> -#define MCSR0_INT_IMPL_SHIFT 58
> -#define MCSR0_INT_IMPL 0
> -#define MCSR0_IOCSR_BRD_SHIFT 57
> -#define MCSR0_IOCSR_BRD (_ULCAST_(1) << MCSR0_IOCSR_BRD_SHIFT)
> -#define MCSR0_HUGEPG_SHIFT 56
> -#define MCSR0_HUGEPG (_ULCAST_(1) << MCSR0_HUGEPG_SHIFT)
> -#define MCSR0_RPLMTLB_SHIFT 55
> -#define MCSR0_RPLMTLB (_ULCAST_(1) << MCSR0_RPLMTLB_SHIFT)
> -#define MCSR0_EP_SHIFT 54
> -#define MCSR0_EP (_ULCAST_(1) << MCSR0_EP_SHIFT)
> -#define MCSR0_RI_SHIFT 53
> -#define MCSR0_RI (_ULCAST_(1) << MCSR0_RI_SHIFT)
> -#define MCSR0_UAL_SHIFT 52
> -#define MCSR0_UAL (_ULCAST_(1) << MCSR0_UAL_SHIFT)
> -#define MCSR0_VABIT_SHIFT 44
> -#define MCSR0_VABIT_WIDTH 8
> -#define MCSR0_VABIT (_ULCAST_(0xff) << MCSR0_VABIT_SHIFT)
> -#define VABIT_DEFAULT 0x2f
> -#define MCSR0_PABIT_SHIFT 36
> -#define MCSR0_PABIT_WIDTH 8
> -#define MCSR0_PABIT (_ULCAST_(0xff) << MCSR0_PABIT_SHIFT)
> -#define PABIT_DEFAULT 0x2f
> -#define MCSR0_IOCSR_SHIFT 35
> -#define MCSR0_IOCSR (_ULCAST_(1) << MCSR0_IOCSR_SHIFT)
> -#define MCSR0_PAGING_SHIFT 34
> -#define MCSR0_PAGING (_ULCAST_(1) << MCSR0_PAGING_SHIFT)
> -#define MCSR0_GR64_SHIFT 33
> -#define MCSR0_GR64 (_ULCAST_(1) << MCSR0_GR64_SHIFT)
> -#define GR64_DEFAULT 1
> -#define MCSR0_GR32_SHIFT 32
> -#define MCSR0_GR32 (_ULCAST_(1) << MCSR0_GR32_SHIFT)
> -#define GR32_DEFAULT 0
> -#define MCSR0_PRID_WIDTH 32
> -#define MCSR0_PRID 0x14C010
> -
> -#define LOONGARCH_CSR_MCSR1 0xc1 /* CPUCFG2 and CPUCFG3 */
> -#define MCSR1_HPFOLD_SHIFT 43
> -#define MCSR1_HPFOLD (_ULCAST_(1) << MCSR1_HPFOLD_SHIFT)
> -#define MCSR1_SPW_LVL_SHIFT 40
> -#define MCSR1_SPW_LVL_WIDTH 3
> -#define MCSR1_SPW_LVL (_ULCAST_(7) << MCSR1_SPW_LVL_SHIFT)
> -#define MCSR1_ICACHET_SHIFT 39
> -#define MCSR1_ICACHET (_ULCAST_(1) << MCSR1_ICACHET_SHIFT)
> -#define MCSR1_ITLBT_SHIFT 38
> -#define MCSR1_ITLBT (_ULCAST_(1) << MCSR1_ITLBT_SHIFT)
> -#define MCSR1_LLDBAR_SHIFT 37
> -#define MCSR1_LLDBAR (_ULCAST_(1) << MCSR1_LLDBAR_SHIFT)
> -#define MCSR1_SCDLY_SHIFT 36
> -#define MCSR1_SCDLY (_ULCAST_(1) << MCSR1_SCDLY_SHIFT)
> -#define MCSR1_LLEXC_SHIFT 35
> -#define MCSR1_LLEXC (_ULCAST_(1) << MCSR1_LLEXC_SHIFT)
> -#define MCSR1_UCACC_SHIFT 34
> -#define MCSR1_UCACC (_ULCAST_(1) << MCSR1_UCACC_SHIFT)
> -#define MCSR1_SFB_SHIFT 33
> -#define MCSR1_SFB (_ULCAST_(1) << MCSR1_SFB_SHIFT)
> -#define MCSR1_CCDMA_SHIFT 32
> -#define MCSR1_CCDMA (_ULCAST_(1) << MCSR1_CCDMA_SHIFT)
> -#define MCSR1_LAMO_SHIFT 22
> -#define MCSR1_LAMO (_ULCAST_(1) << MCSR1_LAMO_SHIFT)
> -#define MCSR1_LSPW_SHIFT 21
> -#define MCSR1_LSPW (_ULCAST_(1) << MCSR1_LSPW_SHIFT)
> -#define MCSR1_MIPSBT_SHIFT 20
> -#define MCSR1_MIPSBT (_ULCAST_(1) << MCSR1_MIPSBT_SHIFT)
> -#define MCSR1_ARMBT_SHIFT 19
> -#define MCSR1_ARMBT (_ULCAST_(1) << MCSR1_ARMBT_SHIFT)
> -#define MCSR1_X86BT_SHIFT 18
> -#define MCSR1_X86BT (_ULCAST_(1) << MCSR1_X86BT_SHIFT)
> -#define MCSR1_LLFTPVERS_SHIFT 15
> -#define MCSR1_LLFTPVERS_WIDTH 3
> -#define MCSR1_LLFTPVERS (_ULCAST_(7) << MCSR1_LLFTPVERS_SHIFT)
> -#define MCSR1_LLFTP_SHIFT 14
> -#define MCSR1_LLFTP (_ULCAST_(1) << MCSR1_LLFTP_SHIFT)
> -#define MCSR1_VZVERS_SHIFT 11
> -#define MCSR1_VZVERS_WIDTH 3
> -#define MCSR1_VZVERS (_ULCAST_(7) << MCSR1_VZVERS_SHIFT)
> -#define MCSR1_VZ_SHIFT 10
> -#define MCSR1_VZ (_ULCAST_(1) << MCSR1_VZ_SHIFT)
> -#define MCSR1_CRYPTO_SHIFT 9
> -#define MCSR1_CRYPTO (_ULCAST_(1) << MCSR1_CRYPTO_SHIFT)
> -#define MCSR1_COMPLEX_SHIFT 8
> -#define MCSR1_COMPLEX (_ULCAST_(1) << MCSR1_COMPLEX_SHIFT)
> -#define MCSR1_LASX_SHIFT 7
> -#define MCSR1_LASX (_ULCAST_(1) << MCSR1_LASX_SHIFT)
> -#define MCSR1_LSX_SHIFT 6
> -#define MCSR1_LSX (_ULCAST_(1) << MCSR1_LSX_SHIFT)
> -#define MCSR1_FPVERS_SHIFT 3
> -#define MCSR1_FPVERS_WIDTH 3
> -#define MCSR1_FPVERS (_ULCAST_(7) << MCSR1_FPVERS_SHIFT)
> -#define MCSR1_FPDP_SHIFT 2
> -#define MCSR1_FPDP (_ULCAST_(1) << MCSR1_FPDP_SHIFT)
> -#define MCSR1_FPSP_SHIFT 1
> -#define MCSR1_FPSP (_ULCAST_(1) << MCSR1_FPSP_SHIFT)
> -#define MCSR1_FP_SHIFT 0
> -#define MCSR1_FP (_ULCAST_(1) << MCSR1_FP_SHIFT)
> -
> -#define LOONGARCH_CSR_MCSR2 0xc2 /* CPUCFG4 and CPUCFG5 */
> -#define MCSR2_CCDIV_SHIFT 48
> -#define MCSR2_CCDIV_WIDTH 16
> -#define MCSR2_CCDIV (_ULCAST_(0xffff) << MCSR2_CCDIV_SHIFT)
> -#define MCSR2_CCMUL_SHIFT 32
> -#define MCSR2_CCMUL_WIDTH 16
> -#define MCSR2_CCMUL (_ULCAST_(0xffff) << MCSR2_CCMUL_SHIFT)
> -#define MCSR2_CCFREQ_WIDTH 32
> -#define MCSR2_CCFREQ (_ULCAST_(0xffffffff))
> -#define CCFREQ_DEFAULT 0x5f5e100 /* 100MHz */
> -
> -#define LOONGARCH_CSR_MCSR3 0xc3 /* CPUCFG6 */
> -#define MCSR3_UPM_SHIFT 14
> -#define MCSR3_UPM (_ULCAST_(1) << MCSR3_UPM_SHIFT)
> -#define MCSR3_PMBITS_SHIFT 8
> -#define MCSR3_PMBITS_WIDTH 6
> -#define MCSR3_PMBITS (_ULCAST_(0x3f) << MCSR3_PMBITS_SHIFT)
> -#define PMBITS_DEFAULT 0x40
> -#define MCSR3_PMNUM_SHIFT 4
> -#define MCSR3_PMNUM_WIDTH 4
> -#define MCSR3_PMNUM (_ULCAST_(0xf) << MCSR3_PMNUM_SHIFT)
> -#define MCSR3_PAMVER_SHIFT 1
> -#define MCSR3_PAMVER_WIDTH 3
> -#define MCSR3_PAMVER (_ULCAST_(0x7) << MCSR3_PAMVER_SHIFT)
> -#define MCSR3_PMP_SHIFT 0
> -#define MCSR3_PMP (_ULCAST_(1) << MCSR3_PMP_SHIFT)
> -
> -#define LOONGARCH_CSR_MCSR8 0xc8 /* CPUCFG16 and CPUCFG17 */
> -#define MCSR8_L1I_SIZE_SHIFT 56
> -#define MCSR8_L1I_SIZE_WIDTH 7
> -#define MCSR8_L1I_SIZE (_ULCAST_(0x7f) << MCSR8_L1I_SIZE_SHIFT)
> -#define MCSR8_L1I_IDX_SHIFT 48
> -#define MCSR8_L1I_IDX_WIDTH 8
> -#define MCSR8_L1I_IDX (_ULCAST_(0xff) << MCSR8_L1I_IDX_SHIFT)
> -#define MCSR8_L1I_WAY_SHIFT 32
> -#define MCSR8_L1I_WAY_WIDTH 16
> -#define MCSR8_L1I_WAY (_ULCAST_(0xffff) << MCSR8_L1I_WAY_SHIFT)
> -#define MCSR8_L3DINCL_SHIFT 16
> -#define MCSR8_L3DINCL (_ULCAST_(1) << MCSR8_L3DINCL_SHIFT)
> -#define MCSR8_L3DPRIV_SHIFT 15
> -#define MCSR8_L3DPRIV (_ULCAST_(1) << MCSR8_L3DPRIV_SHIFT)
> -#define MCSR8_L3DPRE_SHIFT 14
> -#define MCSR8_L3DPRE (_ULCAST_(1) << MCSR8_L3DPRE_SHIFT)
> -#define MCSR8_L3IUINCL_SHIFT 13
> -#define MCSR8_L3IUINCL (_ULCAST_(1) << MCSR8_L3IUINCL_SHIFT)
> -#define MCSR8_L3IUPRIV_SHIFT 12
> -#define MCSR8_L3IUPRIV (_ULCAST_(1) << MCSR8_L3IUPRIV_SHIFT)
> -#define MCSR8_L3IUUNIFY_SHIFT 11
> -#define MCSR8_L3IUUNIFY (_ULCAST_(1) << MCSR8_L3IUUNIFY_SHIFT)
> -#define MCSR8_L3IUPRE_SHIFT 10
> -#define MCSR8_L3IUPRE (_ULCAST_(1) << MCSR8_L3IUPRE_SHIFT)
> -#define MCSR8_L2DINCL_SHIFT 9
> -#define MCSR8_L2DINCL (_ULCAST_(1) << MCSR8_L2DINCL_SHIFT)
> -#define MCSR8_L2DPRIV_SHIFT 8
> -#define MCSR8_L2DPRIV (_ULCAST_(1) << MCSR8_L2DPRIV_SHIFT)
> -#define MCSR8_L2DPRE_SHIFT 7
> -#define MCSR8_L2DPRE (_ULCAST_(1) << MCSR8_L2DPRE_SHIFT)
> -#define MCSR8_L2IUINCL_SHIFT 6
> -#define MCSR8_L2IUINCL (_ULCAST_(1) << MCSR8_L2IUINCL_SHIFT)
> -#define MCSR8_L2IUPRIV_SHIFT 5
> -#define MCSR8_L2IUPRIV (_ULCAST_(1) << MCSR8_L2IUPRIV_SHIFT)
> -#define MCSR8_L2IUUNIFY_SHIFT 4
> -#define MCSR8_L2IUUNIFY (_ULCAST_(1) << MCSR8_L2IUUNIFY_SHIFT)
> -#define MCSR8_L2IUPRE_SHIFT 3
> -#define MCSR8_L2IUPRE (_ULCAST_(1) << MCSR8_L2IUPRE_SHIFT)
> -#define MCSR8_L1DPRE_SHIFT 2
> -#define MCSR8_L1DPRE (_ULCAST_(1) << MCSR8_L1DPRE_SHIFT)
> -#define MCSR8_L1IUUNIFY_SHIFT 1
> -#define MCSR8_L1IUUNIFY (_ULCAST_(1) << MCSR8_L1IUUNIFY_SHIFT)
> -#define MCSR8_L1IUPRE_SHIFT 0
> -#define MCSR8_L1IUPRE (_ULCAST_(1) << MCSR8_L1IUPRE_SHIFT)
> -
> -#define LOONGARCH_CSR_MCSR9 0xc9 /* CPUCFG18 and CPUCFG19 */
> -#define MCSR9_L2U_SIZE_SHIFT 56
> -#define MCSR9_L2U_SIZE_WIDTH 7
> -#define MCSR9_L2U_SIZE (_ULCAST_(0x7f) << MCSR9_L2U_SIZE_SHIFT)
> -#define MCSR9_L2U_IDX_SHIFT 48
> -#define MCSR9_L2U_IDX_WIDTH 8
> -#define MCSR9_L2U_IDX (_ULCAST_(0xff) << MCSR9_IDX_LOG_SHIFT)
> -#define MCSR9_L2U_WAY_SHIFT 32
> -#define MCSR9_L2U_WAY_WIDTH 16
> -#define MCSR9_L2U_WAY (_ULCAST_(0xffff) << MCSR9_L2U_WAY_SHIFT)
> -#define MCSR9_L1D_SIZE_SHIFT 24
> -#define MCSR9_L1D_SIZE_WIDTH 7
> -#define MCSR9_L1D_SIZE (_ULCAST_(0x7f) << MCSR9_L1D_SIZE_SHIFT)
> -#define MCSR9_L1D_IDX_SHIFT 16
> -#define MCSR9_L1D_IDX_WIDTH 8
> -#define MCSR9_L1D_IDX (_ULCAST_(0xff) << MCSR9_L1D_IDX_SHIFT)
> -#define MCSR9_L1D_WAY_SHIFT 0
> -#define MCSR9_L1D_WAY_WIDTH 16
> -#define MCSR9_L1D_WAY (_ULCAST_(0xffff) << MCSR9_L1D_WAY_SHIFT)
> -
> -#define LOONGARCH_CSR_MCSR10 0xca /* CPUCFG20 */
> -#define MCSR10_L3U_SIZE_SHIFT 24
> -#define MCSR10_L3U_SIZE_WIDTH 7
> -#define MCSR10_L3U_SIZE (_ULCAST_(0x7f) << MCSR10_L3U_SIZE_SHIFT)
> -#define MCSR10_L3U_IDX_SHIFT 16
> -#define MCSR10_L3U_IDX_WIDTH 8
> -#define MCSR10_L3U_IDX (_ULCAST_(0xff) << MCSR10_L3U_IDX_SHIFT)
> -#define MCSR10_L3U_WAY_SHIFT 0
> -#define MCSR10_L3U_WAY_WIDTH 16
> -#define MCSR10_L3U_WAY (_ULCAST_(0xffff) << MCSR10_L3U_WAY_SHIFT)
> -
> -#define LOONGARCH_CSR_MCSR24 0xf0 /* cpucfg48 */
> -#define MCSR24_RAMCG_SHIFT 3
> -#define MCSR24_RAMCG (_ULCAST_(1) << MCSR24_RAMCG_SHIFT)
> -#define MCSR24_VFPUCG_SHIFT 2
> -#define MCSR24_VFPUCG (_ULCAST_(1) << MCSR24_VFPUCG_SHIFT)
> -#define MCSR24_NAPEN_SHIFT 1
> -#define MCSR24_NAPEN (_ULCAST_(1) << MCSR24_NAPEN_SHIFT)
> -#define MCSR24_MCSRLOCK_SHIFT 0
> -#define MCSR24_MCSRLOCK (_ULCAST_(1) << MCSR24_MCSRLOCK_SHIFT)
> -
> -/* Uncached accelerate windows registers */
> -#define LOONGARCH_CSR_UCAWIN 0x100
> -#define LOONGARCH_CSR_UCAWIN0_LO 0x102
> -#define LOONGARCH_CSR_UCAWIN0_HI 0x103
> -#define LOONGARCH_CSR_UCAWIN1_LO 0x104
> -#define LOONGARCH_CSR_UCAWIN1_HI 0x105
> -#define LOONGARCH_CSR_UCAWIN2_LO 0x106
> -#define LOONGARCH_CSR_UCAWIN2_HI 0x107
> -#define LOONGARCH_CSR_UCAWIN3_LO 0x108
> -#define LOONGARCH_CSR_UCAWIN3_HI 0x109
> -
> /* Direct Map windows registers */
> #define LOONGARCH_CSR_DMWIN0 0x180 /* 64 direct map win0: MEM & IF */
> #define LOONGARCH_CSR_DMWIN1 0x181 /* 64 direct map win1: MEM & IF */
>
Hi all,
Are you OK with this change? Any comments will be much appreciated.
Thanks,
Tiezhu
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