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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5709f7cfd8
Calculating the slice mask can become a signifcant overhead for get_unmapped_area. This patch adds a struct slice_mask for each page size in the mm_context, and keeps these in synch with the slices psize arrays and slb_addr_limit. On Book3S/64 this adds 288 bytes to the mm_context_t for the slice mask caches. On POWER8, this increases vfork+exec+exit performance by 9.9% and reduces time to mmap+munmap a 64kB page by 28%. Reduces time to mmap+munmap by about 10% on 8xx. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
267 lines
9.8 KiB
C
267 lines
9.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_MMU_8XX_H_
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#define _ASM_POWERPC_MMU_8XX_H_
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/*
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* PPC8xx support
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*/
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/* Control/status registers for the MPC8xx.
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* A write operation to these registers causes serialized access.
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* During software tablewalk, the registers used perform mask/shift-add
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* operations when written/read. A TLB entry is created when the Mx_RPN
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* is written, and the contents of several registers are used to
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* create the entry.
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*/
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#define SPRN_MI_CTR 784 /* Instruction TLB control register */
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#define MI_GPM 0x80000000 /* Set domain manager mode */
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#define MI_PPM 0x40000000 /* Set subpage protection */
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#define MI_CIDEF 0x20000000 /* Set cache inhibit when MMU dis */
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#define MI_RSV4I 0x08000000 /* Reserve 4 TLB entries */
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#define MI_PPCS 0x02000000 /* Use MI_RPN prob/priv state */
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#define MI_IDXMASK 0x00001f00 /* TLB index to be loaded */
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#define MI_RESETVAL 0x00000000 /* Value of register at reset */
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/* These are the Ks and Kp from the PowerPC books. For proper operation,
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* Ks = 0, Kp = 1.
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*/
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#define SPRN_MI_AP 786
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#define MI_Ks 0x80000000 /* Should not be set */
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#define MI_Kp 0x40000000 /* Should always be set */
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/*
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* All pages' PP data bits are set to either 001 or 011 by copying _PAGE_EXEC
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* into bit 21 in the ITLBmiss handler (bit 21 is the middle bit), which means
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* respectively NA for All or X for Supervisor and no access for User.
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* Then we use the APG to say whether accesses are according to Page rules or
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* "all Supervisor" rules (Access to all)
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* We also use the 2nd APG bit for _PAGE_ACCESSED when having SWAP:
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* When that bit is not set access is done iaw "all user"
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* which means no access iaw page rules.
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* Therefore, we define 4 APG groups. lsb is _PMD_USER, 2nd is _PAGE_ACCESSED
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* 0x => No access => 11 (all accesses performed as user iaw page definition)
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* 10 => No user => 01 (all accesses performed according to page definition)
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* 11 => User => 00 (all accesses performed as supervisor iaw page definition)
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* We define all 16 groups so that all other bits of APG can take any value
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*/
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#ifdef CONFIG_SWAP
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#define MI_APG_INIT 0xf4f4f4f4
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#else
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#define MI_APG_INIT 0x44444444
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#endif
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/* The effective page number register. When read, contains the information
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* about the last instruction TLB miss. When MI_RPN is written, bits in
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* this register are used to create the TLB entry.
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*/
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#define SPRN_MI_EPN 787
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#define MI_EPNMASK 0xfffff000 /* Effective page number for entry */
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#define MI_EVALID 0x00000200 /* Entry is valid */
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#define MI_ASIDMASK 0x0000000f /* ASID match value */
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/* Reset value is undefined */
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/* A "level 1" or "segment" or whatever you want to call it register.
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* For the instruction TLB, it contains bits that get loaded into the
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* TLB entry when the MI_RPN is written.
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*/
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#define SPRN_MI_TWC 789
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#define MI_APG 0x000001e0 /* Access protection group (0) */
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#define MI_GUARDED 0x00000010 /* Guarded storage */
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#define MI_PSMASK 0x0000000c /* Mask of page size bits */
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#define MI_PS8MEG 0x0000000c /* 8M page size */
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#define MI_PS512K 0x00000004 /* 512K page size */
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#define MI_PS4K_16K 0x00000000 /* 4K or 16K page size */
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#define MI_SVALID 0x00000001 /* Segment entry is valid */
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/* Reset value is undefined */
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/* Real page number. Defined by the pte. Writing this register
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* causes a TLB entry to be created for the instruction TLB, using
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* additional information from the MI_EPN, and MI_TWC registers.
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*/
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#define SPRN_MI_RPN 790
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#define MI_SPS16K 0x00000008 /* Small page size (0 = 4k, 1 = 16k) */
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/* Define an RPN value for mapping kernel memory to large virtual
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* pages for boot initialization. This has real page number of 0,
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* large page size, shared page, cache enabled, and valid.
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* Also mark all subpages valid and write access.
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*/
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#define MI_BOOTINIT 0x000001fd
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#define SPRN_MD_CTR 792 /* Data TLB control register */
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#define MD_GPM 0x80000000 /* Set domain manager mode */
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#define MD_PPM 0x40000000 /* Set subpage protection */
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#define MD_CIDEF 0x20000000 /* Set cache inhibit when MMU dis */
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#define MD_WTDEF 0x10000000 /* Set writethrough when MMU dis */
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#define MD_RSV4I 0x08000000 /* Reserve 4 TLB entries */
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#define MD_TWAM 0x04000000 /* Use 4K page hardware assist */
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#define MD_PPCS 0x02000000 /* Use MI_RPN prob/priv state */
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#define MD_IDXMASK 0x00001f00 /* TLB index to be loaded */
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#define MD_RESETVAL 0x04000000 /* Value of register at reset */
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#define SPRN_M_CASID 793 /* Address space ID (context) to match */
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#define MC_ASIDMASK 0x0000000f /* Bits used for ASID value */
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/* These are the Ks and Kp from the PowerPC books. For proper operation,
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* Ks = 0, Kp = 1.
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*/
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#define SPRN_MD_AP 794
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#define MD_Ks 0x80000000 /* Should not be set */
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#define MD_Kp 0x40000000 /* Should always be set */
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/*
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* All pages' PP data bits are set to either 000 or 011 or 001, which means
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* respectively RW for Supervisor and no access for User, or RO for
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* Supervisor and no access for user and NA for ALL.
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* Then we use the APG to say whether accesses are according to Page rules or
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* "all Supervisor" rules (Access to all)
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* We also use the 2nd APG bit for _PAGE_ACCESSED when having SWAP:
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* When that bit is not set access is done iaw "all user"
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* which means no access iaw page rules.
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* Therefore, we define 4 APG groups. lsb is _PMD_USER, 2nd is _PAGE_ACCESSED
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* 0x => No access => 11 (all accesses performed as user iaw page definition)
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* 10 => No user => 01 (all accesses performed according to page definition)
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* 11 => User => 00 (all accesses performed as supervisor iaw page definition)
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* We define all 16 groups so that all other bits of APG can take any value
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*/
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#ifdef CONFIG_SWAP
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#define MD_APG_INIT 0xf4f4f4f4
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#else
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#define MD_APG_INIT 0x44444444
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#endif
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/* The effective page number register. When read, contains the information
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* about the last instruction TLB miss. When MD_RPN is written, bits in
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* this register are used to create the TLB entry.
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*/
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#define SPRN_MD_EPN 795
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#define MD_EPNMASK 0xfffff000 /* Effective page number for entry */
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#define MD_EVALID 0x00000200 /* Entry is valid */
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#define MD_ASIDMASK 0x0000000f /* ASID match value */
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/* Reset value is undefined */
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/* The pointer to the base address of the first level page table.
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* During a software tablewalk, reading this register provides the address
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* of the entry associated with MD_EPN.
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*/
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#define SPRN_M_TWB 796
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#define M_L1TB 0xfffff000 /* Level 1 table base address */
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#define M_L1INDX 0x00000ffc /* Level 1 index, when read */
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/* Reset value is undefined */
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/* A "level 1" or "segment" or whatever you want to call it register.
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* For the data TLB, it contains bits that get loaded into the TLB entry
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* when the MD_RPN is written. It is also provides the hardware assist
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* for finding the PTE address during software tablewalk.
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*/
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#define SPRN_MD_TWC 797
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#define MD_L2TB 0xfffff000 /* Level 2 table base address */
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#define MD_L2INDX 0xfffffe00 /* Level 2 index (*pte), when read */
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#define MD_APG 0x000001e0 /* Access protection group (0) */
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#define MD_GUARDED 0x00000010 /* Guarded storage */
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#define MD_PSMASK 0x0000000c /* Mask of page size bits */
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#define MD_PS8MEG 0x0000000c /* 8M page size */
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#define MD_PS512K 0x00000004 /* 512K page size */
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#define MD_PS4K_16K 0x00000000 /* 4K or 16K page size */
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#define MD_WT 0x00000002 /* Use writethrough page attribute */
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#define MD_SVALID 0x00000001 /* Segment entry is valid */
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/* Reset value is undefined */
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/* Real page number. Defined by the pte. Writing this register
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* causes a TLB entry to be created for the data TLB, using
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* additional information from the MD_EPN, and MD_TWC registers.
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*/
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#define SPRN_MD_RPN 798
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#define MD_SPS16K 0x00000008 /* Small page size (0 = 4k, 1 = 16k) */
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/* This is a temporary storage register that could be used to save
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* a processor working register during a tablewalk.
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*/
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#define SPRN_M_TW 799
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/* APGs */
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#define M_APG0 0x00000000
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#define M_APG1 0x00000020
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#define M_APG2 0x00000040
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#define M_APG3 0x00000060
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#ifdef CONFIG_PPC_MM_SLICES
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#include <asm/nohash/32/slice.h>
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#define SLICE_ARRAY_SIZE (1 << (32 - SLICE_LOW_SHIFT - 1))
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#endif
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#ifndef __ASSEMBLY__
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struct slice_mask {
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u64 low_slices;
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DECLARE_BITMAP(high_slices, 0);
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};
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typedef struct {
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unsigned int id;
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unsigned int active;
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unsigned long vdso_base;
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#ifdef CONFIG_PPC_MM_SLICES
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u16 user_psize; /* page size index */
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unsigned char low_slices_psize[SLICE_ARRAY_SIZE];
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unsigned char high_slices_psize[0];
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unsigned long slb_addr_limit;
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struct slice_mask mask_base_psize; /* 4k or 16k */
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# ifdef CONFIG_HUGETLB_PAGE
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struct slice_mask mask_512k;
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struct slice_mask mask_8m;
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# endif
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#endif
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} mm_context_t;
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#define PHYS_IMMR_BASE (mfspr(SPRN_IMMR) & 0xfff80000)
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#define VIRT_IMMR_BASE (__fix_to_virt(FIX_IMMR_BASE))
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/* Page size definitions, common between 32 and 64-bit
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*
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* shift : is the "PAGE_SHIFT" value for that page size
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* penc : is the pte encoding mask
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*
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*/
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struct mmu_psize_def {
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unsigned int shift; /* number of bits */
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unsigned int enc; /* PTE encoding */
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unsigned int ind; /* Corresponding indirect page size shift */
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unsigned int flags;
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#define MMU_PAGE_SIZE_DIRECT 0x1 /* Supported as a direct size */
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#define MMU_PAGE_SIZE_INDIRECT 0x2 /* Supported as an indirect size */
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};
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extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
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static inline int shift_to_mmu_psize(unsigned int shift)
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{
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int psize;
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for (psize = 0; psize < MMU_PAGE_COUNT; ++psize)
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if (mmu_psize_defs[psize].shift == shift)
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return psize;
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return -1;
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}
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static inline unsigned int mmu_psize_to_shift(unsigned int mmu_psize)
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{
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if (mmu_psize_defs[mmu_psize].shift)
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return mmu_psize_defs[mmu_psize].shift;
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BUG();
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}
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#endif /* !__ASSEMBLY__ */
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#if defined(CONFIG_PPC_4K_PAGES)
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#define mmu_virtual_psize MMU_PAGE_4K
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#elif defined(CONFIG_PPC_16K_PAGES)
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#define mmu_virtual_psize MMU_PAGE_16K
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#else
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#error "Unsupported PAGE_SIZE"
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#endif
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#define mmu_linear_psize MMU_PAGE_8M
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#endif /* _ASM_POWERPC_MMU_8XX_H_ */
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