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freebsd-dev/sys/powerpc/include/pte.h
Leandro Lupori e2d6c417e3 Implement superpages for PowerPC64 (HPT) 
This change adds support for transparent superpages for PowerPC64
systems using Hashed Page Tables (HPT). All pmap operations are
supported.

The changes were inspired by RISC-V implementation of superpages,
by @markj (r344106), but heavily adapted to fit PPC64 HPT architecture
and existing MMU OEA64 code.

While these changes are not better tested, superpages support is disabled by
default. To enable it, use vm.pmap.superpages_enabled=1.

In this initial implementation, when superpages are disabled, system
performance stays at the same level as without these changes. When
superpages are enabled, buildworld time increases a bit (~2%). However,
for workloads that put a heavy pressure on the TLB the performance boost
is much bigger (see HPC Challenge and pgbench on D25237).

Reviewed by:	jhibbits
Sponsored by:	Eldorado Research Institute (eldorado.org.br)
Differential Revision:	https://reviews.freebsd.org/D25237
2020-11-06 14:12:45 +00:00

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/*-
* SPDX-License-Identifier: BSD-4-Clause
*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $NetBSD: pte.h,v 1.2 1998/08/31 14:43:40 tsubai Exp $
* $FreeBSD$
*/
#ifndef _MACHINE_PTE_H_
#define _MACHINE_PTE_H_
#if defined(AIM)
/*
* Page Table Entries
*/
#ifndef LOCORE
/* 32-bit PTE */
struct pte {
u_int32_t pte_hi;
u_int32_t pte_lo;
};
struct pteg {
struct pte pt[8];
};
/* 64-bit (long) PTE */
struct lpte {
u_int64_t pte_hi;
u_int64_t pte_lo;
};
struct lpteg {
struct lpte pt[8];
};
/* Partition table entry */
struct pate {
u_int64_t pagetab;
u_int64_t proctab;
};
/* Process table entry */
struct prte {
u_int64_t proctab0;
u_int64_t proctab1;
};
typedef struct pte pte_t;
typedef struct lpte lpte_t;
#endif /* LOCORE */
/* 32-bit PTE definitions */
/* High word: */
#define PTE_VALID 0x80000000
#define PTE_VSID_SHFT 7
#define PTE_HID 0x00000040
#define PTE_API 0x0000003f
/* Low word: */
#define PTE_RPGN 0xfffff000
#define PTE_REF 0x00000100
#define PTE_CHG 0x00000080
#define PTE_WIMG 0x00000078
#define PTE_W 0x00000040
#define PTE_I 0x00000020
#define PTE_M 0x00000010
#define PTE_G 0x00000008
#define PTE_PP 0x00000003
#define PTE_SO 0x00000000 /* Super. Only (U: XX, S: RW) */
#define PTE_SW 0x00000001 /* Super. Write-Only (U: RO, S: RW) */
#define PTE_BW 0x00000002 /* Supervisor (U: RW, S: RW) */
#define PTE_BR 0x00000003 /* Both Read Only (U: RO, S: RO) */
#define PTE_RW PTE_BW
#define PTE_RO PTE_BR
#define PTE_EXEC 0x00000200 /* pseudo bit in attrs; page is exec */
/* 64-bit PTE definitions */
/* High quadword: */
#define LPTE_VSID_SHIFT 12
#define LPTE_AVPN_MASK 0xFFFFFFFFFFFFFF80ULL
#define LPTE_AVA_MASK 0x3FFFFFFFFFFFFF80ULL
#define LPTE_API 0x0000000000000F80ULL
#define LPTE_SWBITS 0x0000000000000078ULL
#define LPTE_WIRED 0x0000000000000010ULL
#define LPTE_LOCKED 0x0000000000000008ULL
#define LPTE_BIG 0x0000000000000004ULL /* 4kb/16Mb page */
#define LPTE_HID 0x0000000000000002ULL
#define LPTE_VALID 0x0000000000000001ULL
/* Low quadword: */
#define LP_4K_16M 0x38 /* 4KB base, 16MB actual page size */
#define EXTEND_PTE(x) UINT64_C(x) /* make constants 64-bit */
#define LPTE_RPGN 0xfffffffffffff000ULL
#define LPTE_LP_MASK 0x00000000000ff000ULL
#define LPTE_LP_SHIFT 12
#define LPTE_LP_4K_16M ((unsigned long long)(LP_4K_16M) << LPTE_LP_SHIFT)
#define LPTE_REF EXTEND_PTE( PTE_REF )
#define LPTE_CHG EXTEND_PTE( PTE_CHG )
#define LPTE_WIMG EXTEND_PTE( PTE_WIMG )
#define LPTE_W EXTEND_PTE( PTE_W )
#define LPTE_I EXTEND_PTE( PTE_I )
#define LPTE_M EXTEND_PTE( PTE_M )
#define LPTE_G EXTEND_PTE( PTE_G )
#define LPTE_NOEXEC 0x0000000000000004ULL
#define LPTE_PP EXTEND_PTE( PTE_PP )
#define LPTE_SO EXTEND_PTE( PTE_SO ) /* Super. Only */
#define LPTE_SW EXTEND_PTE( PTE_SW ) /* Super. Write-Only */
#define LPTE_BW EXTEND_PTE( PTE_BW ) /* Supervisor */
#define LPTE_BR EXTEND_PTE( PTE_BR ) /* Both Read Only */
#define LPTE_RW LPTE_BW
#define LPTE_RO LPTE_BR
/* HPT superpage definitions */
#define HPT_SP_SHIFT (VM_LEVEL_0_ORDER + PAGE_SHIFT)
#define HPT_SP_SIZE (1 << HPT_SP_SHIFT)
#define HPT_SP_MASK (HPT_SP_SIZE - 1)
#define HPT_SP_PAGES (1 << VM_LEVEL_0_ORDER)
/* POWER ISA 3.0 Radix Table Definitions */
#define RPTE_VALID 0x8000000000000000ULL
#define RPTE_LEAF 0x4000000000000000ULL /* is a PTE: always 1 */
#define RPTE_SW0 0x2000000000000000ULL
#define RPTE_RPN_MASK 0x00FFFFFFFFFFF000ULL
#define RPTE_RPN_SHIFT 12
#define RPTE_SW1 0x0000000000000800ULL
#define RPTE_SW2 0x0000000000000400ULL
#define RPTE_SW3 0x0000000000000200ULL
#define RPTE_R 0x0000000000000100ULL
#define RPTE_C 0x0000000000000080ULL
#define RPTE_MANAGED RPTE_SW1
#define RPTE_WIRED RPTE_SW2
#define RPTE_PROMOTED RPTE_SW3
#define RPTE_ATTR_MASK 0x0000000000000030ULL
#define RPTE_ATTR_MEM 0x0000000000000000ULL /* PTE M */
#define RPTE_ATTR_SAO 0x0000000000000010ULL /* PTE WIM */
#define RPTE_ATTR_GUARDEDIO 0x0000000000000020ULL /* PTE IMG */
#define RPTE_ATTR_UNGUARDEDIO 0x0000000000000030ULL /* PTE IM */
#define RPTE_EAA_MASK 0x000000000000000FULL
#define RPTE_EAA_P 0x0000000000000008ULL /* Supervisor only */
#define RPTE_EAA_R 0x0000000000000004ULL /* Read allowed */
#define RPTE_EAA_W 0x0000000000000002ULL /* Write (+read) */
#define RPTE_EAA_X 0x0000000000000001ULL /* Execute allowed */
#define RPDE_VALID RPTE_VALID
#define RPDE_LEAF RPTE_LEAF /* is a PTE: always 0 */
#define RPDE_NLB_MASK 0x00FFFFFFFFFFFF00ULL
#define RPDE_NLB_SHIFT 8
#define RPDE_NLS_MASK 0x000000000000001FULL
#define PG_FRAME (0x000ffffffffff000ul)
#define PG_PS_FRAME (0x000fffffffe00000ul)
/*
* Extract bits from address
*/
#define ADDR_SR_SHFT 28
#define ADDR_PIDX 0x0ffff000UL
#define ADDR_PIDX_SHFT 12
#define ADDR_API_SHFT 22
#define ADDR_API_SHFT64 16
#define ADDR_POFF 0x00000fffUL
/*
* Bits in DSISR:
*/
#define DSISR_DIRECT 0x80000000
#define DSISR_NOTFOUND 0x40000000
#define DSISR_PROTECT 0x08000000
#define DSISR_INVRX 0x04000000
#define DSISR_STORE 0x02000000
#define DSISR_DABR 0x00400000
#define DSISR_SEGMENT 0x00200000
#define DSISR_EAR 0x00100000
/*
* Bits in SRR1 on ISI:
*/
#define ISSRR1_NOTFOUND 0x40000000
#define ISSRR1_DIRECT 0x10000000
#define ISSRR1_PROTECT 0x08000000
#define ISSRR1_SEGMENT 0x00200000
#else /* BOOKE */
#include <machine/tlb.h>
/*
* Flags for pte_remove() routine.
*/
#define PTBL_HOLD 0x00000001 /* do not unhold ptbl pages */
#define PTBL_UNHOLD 0x00000002 /* unhold and attempt to free ptbl pages */
#define PTBL_HOLD_FLAG(pmap) (((pmap) == kernel_pmap) ? PTBL_HOLD : PTBL_UNHOLD)
/*
* Page Table Entry definitions and macros.
*
* RPN need only be 32-bit because Book-E has 36-bit addresses, and the smallest
* page size is 4k (12-bit mask), so RPN can really fit into 24 bits.
*/
#ifndef LOCORE
typedef uint64_t pte_t;
#endif
/* RPN mask, TLB0 4K pages */
#define PTE_PA_MASK PAGE_MASK
#if defined(BOOKE_E500)
/* PTE bits assigned to MAS2, MAS3 flags */
#define PTE_MAS2_SHIFT 19
#define PTE_W (MAS2_W << PTE_MAS2_SHIFT)
#define PTE_I (MAS2_I << PTE_MAS2_SHIFT)
#define PTE_M (MAS2_M << PTE_MAS2_SHIFT)
#define PTE_G (MAS2_G << PTE_MAS2_SHIFT)
#define PTE_MAS2_MASK (MAS2_G | MAS2_M | MAS2_I | MAS2_W)
#define PTE_MAS3_SHIFT 2
#define PTE_UX (MAS3_UX << PTE_MAS3_SHIFT)
#define PTE_SX (MAS3_SX << PTE_MAS3_SHIFT)
#define PTE_UW (MAS3_UW << PTE_MAS3_SHIFT)
#define PTE_SW (MAS3_SW << PTE_MAS3_SHIFT)
#define PTE_UR (MAS3_UR << PTE_MAS3_SHIFT)
#define PTE_SR (MAS3_SR << PTE_MAS3_SHIFT)
#define PTE_MAS3_MASK ((MAS3_UX | MAS3_SX | MAS3_UW \
| MAS3_SW | MAS3_UR | MAS3_SR) << PTE_MAS3_SHIFT)
#define PTE_PS_SHIFT 8
#define PTE_PS_4KB (2 << PTE_PS_SHIFT)
#endif
/* Other PTE flags */
#define PTE_VALID 0x00000001 /* Valid */
#define PTE_MODIFIED 0x00001000 /* Modified */
#define PTE_WIRED 0x00002000 /* Wired */
#define PTE_MANAGED 0x00000002 /* Managed */
#define PTE_REFERENCED 0x00040000 /* Referenced */
/*
* Page Table Entry definitions and macros.
*
* We use the hardware page table entry format:
*
* 63 24 23 19 18 17 14 13 12 11 8 7 6 5 4 3 2 1 0
* ---------------------------------------------------------------
* ARPN(12:51) WIMGE R U0:U3 SW0 C PSIZE UX SX UW SW UR SR SW1 V
* ---------------------------------------------------------------
*/
/* PTE fields. */
#define PTE_TSIZE_SHIFT (63-54)
#define PTE_TSIZE_MASK 0x7
#define PTE_TSIZE_SHIFT_DIRECT (63-55)
#define PTE_TSIZE_MASK_DIRECT 0xf
#define PTE_PS_DIRECT(ps) (ps<<PTE_TSIZE_SHIFT_DIRECT) /* Direct Entry Page Size */
#define PTE_PS(ps) (ps<<PTE_TSIZE_SHIFT) /* Page Size */
/* Macro argument must of pte_t type. */
#define PTE_TSIZE(pte) (int)((*pte >> PTE_TSIZE_SHIFT) & PTE_TSIZE_MASK)
#define PTE_TSIZE_DIRECT(pte) (int)((*pte >> PTE_TSIZE_SHIFT_DIRECT) & PTE_TSIZE_MASK_DIRECT)
/* Macro argument must of pte_t type. */
#define PTE_ARPN_SHIFT 12
#define PTE_FLAGS_MASK 0x00ffffff
#define PTE_RPN_FROM_PA(pa) (((pa) & ~PAGE_MASK) << PTE_ARPN_SHIFT)
#define PTE_PA(pte) ((vm_paddr_t)(*pte >> PTE_ARPN_SHIFT) & ~PAGE_MASK)
#define PTE_ISVALID(pte) ((*pte) & PTE_VALID)
#define PTE_ISWIRED(pte) ((*pte) & PTE_WIRED)
#define PTE_ISMANAGED(pte) ((*pte) & PTE_MANAGED)
#define PTE_ISMODIFIED(pte) ((*pte) & PTE_MODIFIED)
#define PTE_ISREFERENCED(pte) ((*pte) & PTE_REFERENCED)
#endif /* BOOKE */
/* Book-E page table format, broken out for the generic pmap.h. */
#ifdef __powerpc64__
#include <machine/tlb.h>
/*
* The virtual address is:
*
* 4K page size
* +-----+-----------+-------+-------------+-------------+----------------+
* | - | pg_root |pdir_l1| dir# | pte# | off in 4K page |
* +-----+-----------+-------+-------------+-------------+----------------+
* 63 52 51 39 38 30 29 ^ 21 20 ^ 12 11 0
* | |
* index in 1 page of pointers
*
* 1st level - Root page table
*
* pp2d consists of PG_ROOT_NENTRIES entries, each being a pointer to
* second level entity, i.e. the page table directory (pdir).
*/
#define PG_ROOT_H 51
#define PG_ROOT_L 39
#define PG_ROOT_SIZE (1UL << PG_ROOT_L) /* va range mapped by pp2d */
#define PG_ROOT_SHIFT PG_ROOT_L
#define PG_ROOT_NUM (PG_ROOT_H - PG_ROOT_L + 1)
#define PG_ROOT_MASK ((1 << PG_ROOT_NUM) - 1)
#define PG_ROOT_IDX(va) ((va >> PG_ROOT_SHIFT) & PG_ROOT_MASK)
#define PG_ROOT_NENTRIES (1 << PG_ROOT_NUM)
#define PG_ROOT_ENTRY_SHIFT 3 /* log2 (sizeof(struct pte_entry **)) */
/*
* 2nd level - page directory directory (pdir l1)
*
* pdir consists of PDIR_NENTRIES entries, each being a pointer to
* second level entity, i.e. the actual page table (ptbl).
*/
#define PDIR_L1_H (PG_ROOT_L-1)
#define PDIR_L1_L 30
#define PDIR_L1_NUM (PDIR_L1_H-PDIR_L1_L+1)
#define PDIR_L1_SIZE (1 << PDIR_L1_L) /* va range mapped by pdir */
#define PDIR_L1_MASK ((1<<PDIR_L1_NUM)-1)
#define PDIR_L1_SHIFT PDIR_L1_L
#define PDIR_L1_NENTRIES (1<<PDIR_L1_NUM)
#define PDIR_L1_IDX(va) (((va) >> PDIR_L1_SHIFT) & PDIR_L1_MASK)
#define PDIR_L1_ENTRY_SHIFT 3 /* log2 (sizeof(struct pte_entry *)) */
#define PDIR_L1_PAGES ((PDIR_L1_NENTRIES * (1<<PDIR_L1_ENTRY_SHIFT)) / PAGE_SIZE)
/*
* 3rd level - page table directory (pdir)
*
* pdir consists of PDIR_NENTRIES entries, each being a pointer to
* second level entity, i.e. the actual page table (ptbl).
*/
#define PDIR_H (PDIR_L1_L-1)
#define PDIR_L 21
#define PDIR_NUM (PDIR_H-PDIR_L+1)
#define PDIR_SIZE (1 << PDIR_L) /* va range mapped by pdir */
#define PDIR_MASK ((1<<PDIR_NUM)-1)
#define PDIR_SHIFT PDIR_L
#define PDIR_NENTRIES (1<<PDIR_NUM)
#define PDIR_IDX(va) (((va) >> PDIR_SHIFT) & PDIR_MASK)
#define PDIR_ENTRY_SHIFT 3 /* log2 (sizeof(struct pte_entry *)) */
#define PDIR_PAGES ((PDIR_NENTRIES * (1<<PDIR_ENTRY_SHIFT)) / PAGE_SIZE)
/*
* 4th level - page table (ptbl)
*
* Page table covers PTBL_NENTRIES page table entries. Page
* table entry (pte) is 64 bit wide and defines mapping
* for a single page.
*/
#define PTBL_H (PDIR_L-1)
#define PTBL_L PAGE_SHIFT
#define PTBL_NUM (PTBL_H-PTBL_L+1)
#define PTBL_MASK ((1<<PTBL_NUM)-1)
#define PTBL_SHIFT PTBL_L
#define PTBL_SIZE PAGE_SIZE /* va range mapped by ptbl entry */
#define PTBL_NENTRIES (1<<PTBL_NUM)
#define PTBL_IDX(va) ((va >> PTBL_SHIFT) & PTBL_MASK)
#define PTBL_ENTRY_SHIFT 3 /* log2 (sizeof (struct pte_entry)) */
#define PTBL_PAGES ((PTBL_NENTRIES * (1<<PTBL_ENTRY_SHIFT)) / PAGE_SIZE)
#else
/*
* 1st level - page table directory (pdir)
*
* pdir consists of 1024 entries, each being a pointer to
* second level entity, i.e. the actual page table (ptbl).
*/
#define PDIR_SHIFT 22
#define PDIR_SIZE (1 << PDIR_SHIFT) /* va range mapped by pdir */
#define PDIR_MASK (~(PDIR_SIZE - 1))
#define PDIR_NENTRIES 1024 /* number of page tables in pdir */
/* Returns pdir entry number for given va */
#define PDIR_IDX(va) ((va) >> PDIR_SHIFT)
#define PDIR_ENTRY_SHIFT 2 /* entry size is 2^2 = 4 bytes */
/*
* 2nd level - page table (ptbl)
*
* Page table covers 1024 page table entries. Page
* table entry (pte) is 32 bit wide and defines mapping
* for a single page.
*/
#define PTBL_SHIFT PAGE_SHIFT
#define PTBL_SIZE PAGE_SIZE /* va range mapped by ptbl entry */
#define PTBL_MASK ((PDIR_SIZE - 1) & ~((1 << PAGE_SHIFT) - 1))
#define PTBL_NENTRIES 1024 /* number of pages mapped by ptbl */
/* Returns ptbl entry number for given va */
#define PTBL_IDX(va) (((va) & PTBL_MASK) >> PTBL_SHIFT)
/* Size of ptbl in pages, 1024 entries, each sizeof(struct pte_entry). */
#define PTBL_PAGES 2
#define PTBL_ENTRY_SHIFT 3 /* entry size is 2^3 = 8 bytes */
#endif
#endif /* _MACHINE_PTE_H_ */
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