Viewing file:  mmu-hash.h (28.19 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ASM_POWERPC_BOOK3S_64_MMU_HASH_H_
#define _ASM_POWERPC_BOOK3S_64_MMU_HASH_H_
/*
* PowerPC64 memory management structures
*
* Dave Engebretsen & Mike Corrigan <{engebret|mikejc}@us.ibm.com>
* PPC64 rework.
*/
#include <asm/page.h>
#include <asm/bug.h>
#include <asm/asm-const.h>
/*
* This is necessary to get the definition of PGTABLE_RANGE which we
* need for various slices related matters. Note that this isn't the
* complete pgtable.h but only a portion of it.
*/
#include <asm/book3s/64/pgtable.h>
#include <asm/task_size_64.h>
#include <asm/cpu_has_feature.h>
/*
* SLB
*/
#define SLB_NUM_BOLTED 2
#define SLB_CACHE_ENTRIES 8
#define SLB_MIN_SIZE 32
/* Bits in the SLB ESID word */
#define SLB_ESID_V ASM_CONST(0x0000000008000000) /* valid */
/* Bits in the SLB VSID word */
#define SLB_VSID_SHIFT 12
#define SLB_VSID_SHIFT_256M SLB_VSID_SHIFT
#define SLB_VSID_SHIFT_1T 24
#define SLB_VSID_SSIZE_SHIFT 62
#define SLB_VSID_B ASM_CONST(0xc000000000000000)
#define SLB_VSID_B_256M ASM_CONST(0x0000000000000000)
#define SLB_VSID_B_1T ASM_CONST(0x4000000000000000)
#define SLB_VSID_KS ASM_CONST(0x0000000000000800)
#define SLB_VSID_KP ASM_CONST(0x0000000000000400)
#define SLB_VSID_N ASM_CONST(0x0000000000000200) /* no-execute */
#define SLB_VSID_L ASM_CONST(0x0000000000000100)
#define SLB_VSID_C ASM_CONST(0x0000000000000080) /* class */
#define SLB_VSID_LP ASM_CONST(0x0000000000000030)
#define SLB_VSID_LP_00 ASM_CONST(0x0000000000000000)
#define SLB_VSID_LP_01 ASM_CONST(0x0000000000000010)
#define SLB_VSID_LP_10 ASM_CONST(0x0000000000000020)
#define SLB_VSID_LP_11 ASM_CONST(0x0000000000000030)
#define SLB_VSID_LLP (SLB_VSID_L|SLB_VSID_LP)
#define SLB_VSID_KERNEL (SLB_VSID_KP)
#define SLB_VSID_USER (SLB_VSID_KP|SLB_VSID_KS|SLB_VSID_C)
#define SLBIE_C (0x08000000)
#define SLBIE_SSIZE_SHIFT 25
/*
* Hash table
*/
#define HPTES_PER_GROUP 8
#define HPTE_V_SSIZE_SHIFT 62
#define HPTE_V_AVPN_SHIFT 7
#define HPTE_V_COMMON_BITS ASM_CONST(0x000fffffffffffff)
#define HPTE_V_AVPN ASM_CONST(0x3fffffffffffff80)
#define HPTE_V_AVPN_3_0 ASM_CONST(0x000fffffffffff80)
#define HPTE_V_AVPN_VAL(x) (((x) & HPTE_V_AVPN) >> HPTE_V_AVPN_SHIFT)
#define HPTE_V_COMPARE(x,y) (!(((x) ^ (y)) & 0xffffffffffffff80UL))
#define HPTE_V_BOLTED ASM_CONST(0x0000000000000010)
#define HPTE_V_LOCK ASM_CONST(0x0000000000000008)
#define HPTE_V_LARGE ASM_CONST(0x0000000000000004)
#define HPTE_V_SECONDARY ASM_CONST(0x0000000000000002)
#define HPTE_V_VALID ASM_CONST(0x0000000000000001)
/*
* ISA 3.0 has a different HPTE format.
*/
#define HPTE_R_3_0_SSIZE_SHIFT 58
#define HPTE_R_3_0_SSIZE_MASK (3ull << HPTE_R_3_0_SSIZE_SHIFT)
#define HPTE_R_PP0 ASM_CONST(0x8000000000000000)
#define HPTE_R_TS ASM_CONST(0x4000000000000000)
#define HPTE_R_KEY_HI ASM_CONST(0x3000000000000000)
#define HPTE_R_KEY_BIT4 ASM_CONST(0x2000000000000000)
#define HPTE_R_KEY_BIT3 ASM_CONST(0x1000000000000000)
#define HPTE_R_RPN_SHIFT 12
#define HPTE_R_RPN ASM_CONST(0x0ffffffffffff000)
#define HPTE_R_RPN_3_0 ASM_CONST(0x01fffffffffff000)
#define HPTE_R_PP ASM_CONST(0x0000000000000003)
#define HPTE_R_PPP ASM_CONST(0x8000000000000003)
#define HPTE_R_N ASM_CONST(0x0000000000000004)
#define HPTE_R_G ASM_CONST(0x0000000000000008)
#define HPTE_R_M ASM_CONST(0x0000000000000010)
#define HPTE_R_I ASM_CONST(0x0000000000000020)
#define HPTE_R_W ASM_CONST(0x0000000000000040)
#define HPTE_R_WIMG ASM_CONST(0x0000000000000078)
#define HPTE_R_C ASM_CONST(0x0000000000000080)
#define HPTE_R_R ASM_CONST(0x0000000000000100)
#define HPTE_R_KEY_LO ASM_CONST(0x0000000000000e00)
#define HPTE_R_KEY_BIT2 ASM_CONST(0x0000000000000800)
#define HPTE_R_KEY_BIT1 ASM_CONST(0x0000000000000400)
#define HPTE_R_KEY_BIT0 ASM_CONST(0x0000000000000200)
#define HPTE_R_KEY (HPTE_R_KEY_LO | HPTE_R_KEY_HI)
#define HPTE_V_1TB_SEG ASM_CONST(0x4000000000000000)
#define HPTE_V_VRMA_MASK ASM_CONST(0x4001ffffff000000)
/* Values for PP (assumes Ks=0, Kp=1) */
#define PP_RWXX 0 /* Supervisor read/write, User none */
#define PP_RWRX 1 /* Supervisor read/write, User read */
#define PP_RWRW 2 /* Supervisor read/write, User read/write */
#define PP_RXRX 3 /* Supervisor read, User read */
#define PP_RXXX (HPTE_R_PP0 | 2) /* Supervisor read, user none */
/* Fields for tlbiel instruction in architecture 2.06 */
#define TLBIEL_INVAL_SEL_MASK 0xc00 /* invalidation selector */
#define TLBIEL_INVAL_PAGE 0x000 /* invalidate a single page */
#define TLBIEL_INVAL_SET_LPID 0x800 /* invalidate a set for current LPID */
#define TLBIEL_INVAL_SET 0xc00 /* invalidate a set for all LPIDs */
#define TLBIEL_INVAL_SET_MASK 0xfff000 /* set number to inval. */
#define TLBIEL_INVAL_SET_SHIFT 12
#define POWER7_TLB_SETS 128 /* # sets in POWER7 TLB */
#define POWER8_TLB_SETS 512 /* # sets in POWER8 TLB */
#define POWER9_TLB_SETS_HASH 256 /* # sets in POWER9 TLB Hash mode */
#define POWER9_TLB_SETS_RADIX 128 /* # sets in POWER9 TLB Radix mode */
#ifndef __ASSEMBLY__
struct mmu_hash_ops {
void (*hpte_invalidate)(unsigned long slot,
unsigned long vpn,
int bpsize, int apsize,
int ssize, int local);
long (*hpte_updatepp)(unsigned long slot,
unsigned long newpp,
unsigned long vpn,
int bpsize, int apsize,
int ssize, unsigned long flags);
void (*hpte_updateboltedpp)(unsigned long newpp,
unsigned long ea,
int psize, int ssize);
long (*hpte_insert)(unsigned long hpte_group,
unsigned long vpn,
unsigned long prpn,
unsigned long rflags,
unsigned long vflags,
int psize, int apsize,
int ssize);
long (*hpte_remove)(unsigned long hpte_group);
int (*hpte_removebolted)(unsigned long ea,
int psize, int ssize);
void (*flush_hash_range)(unsigned long number, int local);
void (*hugepage_invalidate)(unsigned long vsid,
unsigned long addr,
unsigned char *hpte_slot_array,
int psize, int ssize, int local);
int (*resize_hpt)(unsigned long shift);
/*
* Special for kexec.
* To be called in real mode with interrupts disabled. No locks are
* taken as such, concurrent access on pre POWER5 hardware could result
* in a deadlock.
* The linear mapping is destroyed as well.
*/
void (*hpte_clear_all)(void);
};
extern struct mmu_hash_ops mmu_hash_ops;
struct hash_pte {
__be64 v;
__be64 r;
};
extern struct hash_pte *htab_address;
extern unsigned long htab_size_bytes;
extern unsigned long htab_hash_mask;
static inline int shift_to_mmu_psize(unsigned int shift)
{
int psize;
for (psize = 0; psize < MMU_PAGE_COUNT; ++psize)
if (mmu_psize_defs[psize].shift == shift)
return psize;
return -1;
}
static inline unsigned int mmu_psize_to_shift(unsigned int mmu_psize)
{
if (mmu_psize_defs[mmu_psize].shift)
return mmu_psize_defs[mmu_psize].shift;
BUG();
}
static inline unsigned int ap_to_shift(unsigned long ap)
{
int psize;
for (psize = 0; psize < MMU_PAGE_COUNT; psize++) {
if (mmu_psize_defs[psize].ap == ap)
return mmu_psize_defs[psize].shift;
}
return -1;
}
static inline unsigned long get_sllp_encoding(int psize)
{
unsigned long sllp;
sllp = ((mmu_psize_defs[psize].sllp & SLB_VSID_L) >> 6) |
((mmu_psize_defs[psize].sllp & SLB_VSID_LP) >> 4);
return sllp;
}
#endif /* __ASSEMBLY__ */
/*
* Segment sizes.
* These are the values used by hardware in the B field of
* SLB entries and the first dword of MMU hashtable entries.
* The B field is 2 bits; the values 2 and 3 are unused and reserved.
*/
#define MMU_SEGSIZE_256M 0
#define MMU_SEGSIZE_1T 1
/*
* encode page number shift.
* in order to fit the 78 bit va in a 64 bit variable we shift the va by
* 12 bits. This enable us to address upto 76 bit va.
* For hpt hash from a va we can ignore the page size bits of va and for
* hpte encoding we ignore up to 23 bits of va. So ignoring lower 12 bits ensure
* we work in all cases including 4k page size.
*/
#define VPN_SHIFT 12
/*
* HPTE Large Page (LP) details
*/
#define LP_SHIFT 12
#define LP_BITS 8
#define LP_MASK(i) ((0xFF >> (i)) << LP_SHIFT)
#ifndef __ASSEMBLY__
static inline int slb_vsid_shift(int ssize)
{
if (ssize == MMU_SEGSIZE_256M)
return SLB_VSID_SHIFT;
return SLB_VSID_SHIFT_1T;
}
static inline int segment_shift(int ssize)
{
if (ssize == MMU_SEGSIZE_256M)
return SID_SHIFT;
return SID_SHIFT_1T;
}
/*
* This array is indexed by the LP field of the HPTE second dword.
* Since this field may contain some RPN bits, some entries are
* replicated so that we get the same value irrespective of RPN.
* The top 4 bits are the page size index (MMU_PAGE_*) for the
* actual page size, the bottom 4 bits are the base page size.
*/
extern u8 hpte_page_sizes[1 << LP_BITS];
static inline unsigned long __hpte_page_size(unsigned long h, unsigned long l,
bool is_base_size)
{
unsigned int i, lp;
if (!(h & HPTE_V_LARGE))
return 1ul << 12;
/* Look at the 8 bit LP value */
lp = (l >> LP_SHIFT) & ((1 << LP_BITS) - 1);
i = hpte_page_sizes[lp];
if (!i)
return 0;
if (!is_base_size)
i >>= 4;
return 1ul << mmu_psize_defs[i & 0xf].shift;
}
static inline unsigned long hpte_page_size(unsigned long h, unsigned long l)
{
return __hpte_page_size(h, l, 0);
}
static inline unsigned long hpte_base_page_size(unsigned long h, unsigned long l)
{
return __hpte_page_size(h, l, 1);
}
/*
* The current system page and segment sizes
*/
extern int mmu_kernel_ssize;
extern int mmu_highuser_ssize;
extern u16 mmu_slb_size;
extern unsigned long tce_alloc_start, tce_alloc_end;
/*
* If the processor supports 64k normal pages but not 64k cache
* inhibited pages, we have to be prepared to switch processes
* to use 4k pages when they create cache-inhibited mappings.
* If this is the case, mmu_ci_restrictions will be set to 1.
*/
extern int mmu_ci_restrictions;
/*
* This computes the AVPN and B fields of the first dword of a HPTE,
* for use when we want to match an existing PTE. The bottom 7 bits
* of the returned value are zero.
*/
static inline unsigned long hpte_encode_avpn(unsigned long vpn, int psize,
int ssize)
{
unsigned long v;
/*
* The AVA field omits the low-order 23 bits of the 78 bits VA.
* These bits are not needed in the PTE, because the
* low-order b of these bits are part of the byte offset
* into the virtual page and, if b < 23, the high-order
* 23-b of these bits are always used in selecting the
* PTEGs to be searched
*/
v = (vpn >> (23 - VPN_SHIFT)) & ~(mmu_psize_defs[psize].avpnm);
v <<= HPTE_V_AVPN_SHIFT;
v |= ((unsigned long) ssize) << HPTE_V_SSIZE_SHIFT;
return v;
}
/*
* ISA v3.0 defines a new HPTE format, which differs from the old
* format in having smaller AVPN and ARPN fields, and the B field
* in the second dword instead of the first.
*/
static inline unsigned long hpte_old_to_new_v(unsigned long v)
{
/* trim AVPN, drop B */
return v & HPTE_V_COMMON_BITS;
}
static inline unsigned long hpte_old_to_new_r(unsigned long v, unsigned long r)
{
/* move B field from 1st to 2nd dword, trim ARPN */
return (r & ~HPTE_R_3_0_SSIZE_MASK) |
(((v) >> HPTE_V_SSIZE_SHIFT) << HPTE_R_3_0_SSIZE_SHIFT);
}
static inline unsigned long hpte_new_to_old_v(unsigned long v, unsigned long r)
{
/* insert B field */
return (v & HPTE_V_COMMON_BITS) |
((r & HPTE_R_3_0_SSIZE_MASK) <<
(HPTE_V_SSIZE_SHIFT - HPTE_R_3_0_SSIZE_SHIFT));
}
static inline unsigned long hpte_new_to_old_r(unsigned long r)
{
/* clear out B field */
return r & ~HPTE_R_3_0_SSIZE_MASK;
}
static inline unsigned long hpte_get_old_v(struct hash_pte *hptep)
{
unsigned long hpte_v;
hpte_v = be64_to_cpu(hptep->v);
if (cpu_has_feature(CPU_FTR_ARCH_300))
hpte_v = hpte_new_to_old_v(hpte_v, be64_to_cpu(hptep->r));
return hpte_v;
}
/*
* This function sets the AVPN and L fields of the HPTE appropriately
* using the base page size and actual page size.
*/
static inline unsigned long hpte_encode_v(unsigned long vpn, int base_psize,
int actual_psize, int ssize)
{
unsigned long v;
v = hpte_encode_avpn(vpn, base_psize, ssize);
if (actual_psize != MMU_PAGE_4K)
v |= HPTE_V_LARGE;
return v;
}
/*
* This function sets the ARPN, and LP fields of the HPTE appropriately
* for the page size. We assume the pa is already "clean" that is properly
* aligned for the requested page size
*/
static inline unsigned long hpte_encode_r(unsigned long pa, int base_psize,
int actual_psize)
{
/* A 4K page needs no special encoding */
if (actual_psize == MMU_PAGE_4K)
return pa & HPTE_R_RPN;
else {
unsigned int penc = mmu_psize_defs[base_psize].penc[actual_psize];
unsigned int shift = mmu_psize_defs[actual_psize].shift;
return (pa & ~((1ul << shift) - 1)) | (penc << LP_SHIFT);
}
}
/*
* Build a VPN_SHIFT bit shifted va given VSID, EA and segment size.
*/
static inline unsigned long hpt_vpn(unsigned long ea,
unsigned long vsid, int ssize)
{
unsigned long mask;
int s_shift = segment_shift(ssize);
mask = (1ul << (s_shift - VPN_SHIFT)) - 1;
return (vsid << (s_shift - VPN_SHIFT)) | ((ea >> VPN_SHIFT) & mask);
}
/*
* This hashes a virtual address
*/
static inline unsigned long hpt_hash(unsigned long vpn,
unsigned int shift, int ssize)
{
unsigned long mask;
unsigned long hash, vsid;
/* VPN_SHIFT can be atmost 12 */
if (ssize == MMU_SEGSIZE_256M) {
mask = (1ul << (SID_SHIFT - VPN_SHIFT)) - 1;
hash = (vpn >> (SID_SHIFT - VPN_SHIFT)) ^
((vpn & mask) >> (shift - VPN_SHIFT));
} else {
mask = (1ul << (SID_SHIFT_1T - VPN_SHIFT)) - 1;
vsid = vpn >> (SID_SHIFT_1T - VPN_SHIFT);
hash = vsid ^ (vsid << 25) ^
((vpn & mask) >> (shift - VPN_SHIFT)) ;
}
return hash & 0x7fffffffffUL;
}
#define HPTE_LOCAL_UPDATE 0x1
#define HPTE_NOHPTE_UPDATE 0x2
#define HPTE_USE_KERNEL_KEY 0x4
long hpte_insert_repeating(unsigned long hash, unsigned long vpn, unsigned long pa,
unsigned long rlags, unsigned long vflags, int psize, int ssize);
extern int __hash_page_4K(unsigned long ea, unsigned long access,
unsigned long vsid, pte_t *ptep, unsigned long trap,
unsigned long flags, int ssize, int subpage_prot);
extern int __hash_page_64K(unsigned long ea, unsigned long access,
unsigned long vsid, pte_t *ptep, unsigned long trap,
unsigned long flags, int ssize);
struct mm_struct;
unsigned int hash_page_do_lazy_icache(unsigned int pp, pte_t pte, int trap);
extern int hash_page_mm(struct mm_struct *mm, unsigned long ea,
unsigned long access, unsigned long trap,
unsigned long flags);
extern int hash_page(unsigned long ea, unsigned long access, unsigned long trap,
unsigned long dsisr);
void low_hash_fault(struct pt_regs *regs, unsigned long address, int rc);
int __hash_page(unsigned long trap, unsigned long ea, unsigned long dsisr, unsigned long msr);
int __hash_page_huge(unsigned long ea, unsigned long access, unsigned long vsid,
pte_t *ptep, unsigned long trap, unsigned long flags,
int ssize, unsigned int shift, unsigned int mmu_psize);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
extern int __hash_page_thp(unsigned long ea, unsigned long access,
unsigned long vsid, pmd_t *pmdp, unsigned long trap,
unsigned long flags, int ssize, unsigned int psize);
#else
static inline int __hash_page_thp(unsigned long ea, unsigned long access,
unsigned long vsid, pmd_t *pmdp,
unsigned long trap, unsigned long flags,
int ssize, unsigned int psize)
{
BUG();
return -1;
}
#endif
extern void hash_failure_debug(unsigned long ea, unsigned long access,
unsigned long vsid, unsigned long trap,
int ssize, int psize, int lpsize,
unsigned long pte);
extern int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
unsigned long pstart, unsigned long prot,
int psize, int ssize);
int htab_remove_mapping(unsigned long vstart, unsigned long vend,
int psize, int ssize);
extern void pseries_add_gpage(u64 addr, u64 page_size, unsigned long number_of_pages);
extern void demote_segment_4k(struct mm_struct *mm, unsigned long addr);
extern void hash__setup_new_exec(void);
#ifdef CONFIG_PPC_PSERIES
void hpte_init_pseries(void);
#else
static inline void hpte_init_pseries(void) { }
#endif
extern void hpte_init_native(void);
struct slb_entry {
u64 esid;
u64 vsid;
};
extern void slb_initialize(void);
void slb_flush_and_restore_bolted(void);
void slb_flush_all_realmode(void);
void __slb_restore_bolted_realmode(void);
void slb_restore_bolted_realmode(void);
void slb_save_contents(struct slb_entry *slb_ptr);
void slb_dump_contents(struct slb_entry *slb_ptr);
extern void slb_vmalloc_update(void);
extern void slb_set_size(u16 size);
void preload_new_slb_context(unsigned long start, unsigned long sp);
#endif /* __ASSEMBLY__ */
/*
* VSID allocation (256MB segment)
*
* We first generate a 37-bit "proto-VSID". Proto-VSIDs are generated
* from mmu context id and effective segment id of the address.
*
* For user processes max context id is limited to MAX_USER_CONTEXT.
* more details in get_user_context
*
* For kernel space get_kernel_context
*
* The proto-VSIDs are then scrambled into real VSIDs with the
* multiplicative hash:
*
* VSID = (proto-VSID * VSID_MULTIPLIER) % VSID_MODULUS
*
* VSID_MULTIPLIER is prime, so in particular it is
* co-prime to VSID_MODULUS, making this a 1:1 scrambling function.
* Because the modulus is 2^n-1 we can compute it efficiently without
* a divide or extra multiply (see below). The scramble function gives
* robust scattering in the hash table (at least based on some initial
* results).
*
* We use VSID 0 to indicate an invalid VSID. The means we can't use context id
* 0, because a context id of 0 and an EA of 0 gives a proto-VSID of 0, which
* will produce a VSID of 0.
*
* We also need to avoid the last segment of the last context, because that
* would give a protovsid of 0x1fffffffff. That will result in a VSID 0
* because of the modulo operation in vsid scramble.
*/
/*
* Max Va bits we support as of now is 68 bits. We want 19 bit
* context ID.
* Restrictions:
* GPU has restrictions of not able to access beyond 128TB
* (47 bit effective address). We also cannot do more than 20bit PID.
* For p4 and p5 which can only do 65 bit VA, we restrict our CONTEXT_BITS
* to 16 bits (ie, we can only have 2^16 pids at the same time).
*/
#define VA_BITS 68
#define CONTEXT_BITS 19
#define ESID_BITS (VA_BITS - (SID_SHIFT + CONTEXT_BITS))
#define ESID_BITS_1T (VA_BITS - (SID_SHIFT_1T + CONTEXT_BITS))
#define ESID_BITS_MASK ((1 << ESID_BITS) - 1)
#define ESID_BITS_1T_MASK ((1 << ESID_BITS_1T) - 1)
/*
* Now certain config support MAX_PHYSMEM more than 512TB. Hence we will need
* to use more than one context for linear mapping the kernel.
* For vmalloc and memmap, we use just one context with 512TB. With 64 byte
* struct page size, we need ony 32 TB in memmap for 2PB (51 bits (MAX_PHYSMEM_BITS)).
*/
#if (H_MAX_PHYSMEM_BITS > MAX_EA_BITS_PER_CONTEXT)
#define MAX_KERNEL_CTX_CNT (1UL << (H_MAX_PHYSMEM_BITS - MAX_EA_BITS_PER_CONTEXT))
#else
#define MAX_KERNEL_CTX_CNT 1
#endif
#define MAX_VMALLOC_CTX_CNT 1
#define MAX_IO_CTX_CNT 1
#define MAX_VMEMMAP_CTX_CNT 1
/*
* 256MB segment
* The proto-VSID space has 2^(CONTEX_BITS + ESID_BITS) - 1 segments
* available for user + kernel mapping. VSID 0 is reserved as invalid, contexts
* 1-4 are used for kernel mapping. Each segment contains 2^28 bytes. Each
* context maps 2^49 bytes (512TB).
*
* We also need to avoid the last segment of the last context, because that
* would give a protovsid of 0x1fffffffff. That will result in a VSID 0
* because of the modulo operation in vsid scramble.
*
*/
#define MAX_USER_CONTEXT ((ASM_CONST(1) << CONTEXT_BITS) - 2)
// The + 2 accounts for INVALID_REGION and 1 more to avoid overlap with kernel
#define MIN_USER_CONTEXT (MAX_KERNEL_CTX_CNT + MAX_VMALLOC_CTX_CNT + \
MAX_IO_CTX_CNT + MAX_VMEMMAP_CTX_CNT + 2)
/*
* For platforms that support on 65bit VA we limit the context bits
*/
#define MAX_USER_CONTEXT_65BIT_VA ((ASM_CONST(1) << (65 - (SID_SHIFT + ESID_BITS))) - 2)
/*
* This should be computed such that protovosid * vsid_mulitplier
* doesn't overflow 64 bits. The vsid_mutliplier should also be
* co-prime to vsid_modulus. We also need to make sure that number
* of bits in multiplied result (dividend) is less than twice the number of
* protovsid bits for our modulus optmization to work.
*
* The below table shows the current values used.
* |-------+------------+----------------------+------------+-------------------|
* | | Prime Bits | proto VSID_BITS_65VA | Total Bits | 2* prot VSID_BITS |
* |-------+------------+----------------------+------------+-------------------|
* | 1T | 24 | 25 | 49 | 50 |
* |-------+------------+----------------------+------------+-------------------|
* | 256MB | 24 | 37 | 61 | 74 |
* |-------+------------+----------------------+------------+-------------------|
*
* |-------+------------+----------------------+------------+--------------------|
* | | Prime Bits | proto VSID_BITS_68VA | Total Bits | 2* proto VSID_BITS |
* |-------+------------+----------------------+------------+--------------------|
* | 1T | 24 | 28 | 52 | 56 |
* |-------+------------+----------------------+------------+--------------------|
* | 256MB | 24 | 40 | 64 | 80 |
* |-------+------------+----------------------+------------+--------------------|
*
*/
#define VSID_MULTIPLIER_256M ASM_CONST(12538073) /* 24-bit prime */
#define VSID_BITS_256M (VA_BITS - SID_SHIFT)
#define VSID_BITS_65_256M (65 - SID_SHIFT)
/*
* Modular multiplicative inverse of VSID_MULTIPLIER under modulo VSID_MODULUS
*/
#define VSID_MULINV_256M ASM_CONST(665548017062)
#define VSID_MULTIPLIER_1T ASM_CONST(12538073) /* 24-bit prime */
#define VSID_BITS_1T (VA_BITS - SID_SHIFT_1T)
#define VSID_BITS_65_1T (65 - SID_SHIFT_1T)
#define VSID_MULINV_1T ASM_CONST(209034062)
/* 1TB VSID reserved for VRMA */
#define VRMA_VSID 0x1ffffffUL
#define USER_VSID_RANGE (1UL << (ESID_BITS + SID_SHIFT))
/* 4 bits per slice and we have one slice per 1TB */
#define SLICE_ARRAY_SIZE (H_PGTABLE_RANGE >> 41)
#define LOW_SLICE_ARRAY_SZ (BITS_PER_LONG / BITS_PER_BYTE)
#define TASK_SLICE_ARRAY_SZ(x) ((x)->hash_context->slb_addr_limit >> 41)
#ifndef __ASSEMBLY__
#ifdef CONFIG_PPC_SUBPAGE_PROT
/*
* For the sub-page protection option, we extend the PGD with one of
* these. Basically we have a 3-level tree, with the top level being
* the protptrs array. To optimize speed and memory consumption when
* only addresses < 4GB are being protected, pointers to the first
* four pages of sub-page protection words are stored in the low_prot
* array.
* Each page of sub-page protection words protects 1GB (4 bytes
* protects 64k). For the 3-level tree, each page of pointers then
* protects 8TB.
*/
struct subpage_prot_table {
unsigned long maxaddr; /* only addresses < this are protected */
unsigned int **protptrs[(TASK_SIZE_USER64 >> 43)];
unsigned int *low_prot[4];
};
#define SBP_L1_BITS (PAGE_SHIFT - 2)
#define SBP_L2_BITS (PAGE_SHIFT - 3)
#define SBP_L1_COUNT (1 << SBP_L1_BITS)
#define SBP_L2_COUNT (1 << SBP_L2_BITS)
#define SBP_L2_SHIFT (PAGE_SHIFT + SBP_L1_BITS)
#define SBP_L3_SHIFT (SBP_L2_SHIFT + SBP_L2_BITS)
extern void subpage_prot_free(struct mm_struct *mm);
#else
static inline void subpage_prot_free(struct mm_struct *mm) {}
#endif /* CONFIG_PPC_SUBPAGE_PROT */
/*
* One bit per slice. We have lower slices which cover 256MB segments
* upto 4G range. That gets us 16 low slices. For the rest we track slices
* in 1TB size.
*/
struct slice_mask {
u64 low_slices;
DECLARE_BITMAP(high_slices, SLICE_NUM_HIGH);
};
struct hash_mm_context {
u16 user_psize; /* page size index */
/* SLB page size encodings*/
unsigned char low_slices_psize[LOW_SLICE_ARRAY_SZ];
unsigned char high_slices_psize[SLICE_ARRAY_SIZE];
unsigned long slb_addr_limit;
#ifdef CONFIG_PPC_64K_PAGES
struct slice_mask mask_64k;
#endif
struct slice_mask mask_4k;
#ifdef CONFIG_HUGETLB_PAGE
struct slice_mask mask_16m;
struct slice_mask mask_16g;
#endif
#ifdef CONFIG_PPC_SUBPAGE_PROT
struct subpage_prot_table *spt;
#endif /* CONFIG_PPC_SUBPAGE_PROT */
};
#if 0
/*
* The code below is equivalent to this function for arguments
* < 2^VSID_BITS, which is all this should ever be called
* with. However gcc is not clever enough to compute the
* modulus (2^n-1) without a second multiply.
*/
#define vsid_scramble(protovsid, size) \
((((protovsid) * VSID_MULTIPLIER_##size) % VSID_MODULUS_##size))
/* simplified form avoiding mod operation */
#define vsid_scramble(protovsid, size) \
({ \
unsigned long x; \
x = (protovsid) * VSID_MULTIPLIER_##size; \
x = (x >> VSID_BITS_##size) + (x & VSID_MODULUS_##size); \
(x + ((x+1) >> VSID_BITS_##size)) & VSID_MODULUS_##size; \
})
#else /* 1 */
static inline unsigned long vsid_scramble(unsigned long protovsid,
unsigned long vsid_multiplier, int vsid_bits)
{
unsigned long vsid;
unsigned long vsid_modulus = ((1UL << vsid_bits) - 1);
/*
* We have same multipler for both 256 and 1T segements now
*/
vsid = protovsid * vsid_multiplier;
vsid = (vsid >> vsid_bits) + (vsid & vsid_modulus);
return (vsid + ((vsid + 1) >> vsid_bits)) & vsid_modulus;
}
#endif /* 1 */
/* Returns the segment size indicator for a user address */
static inline int user_segment_size(unsigned long addr)
{
/* Use 1T segments if possible for addresses >= 1T */
if (addr >= (1UL << SID_SHIFT_1T))
return mmu_highuser_ssize;
return MMU_SEGSIZE_256M;
}
static inline unsigned long get_vsid(unsigned long context, unsigned long ea,
int ssize)
{
unsigned long va_bits = VA_BITS;
unsigned long vsid_bits;
unsigned long protovsid;
/*
* Bad address. We return VSID 0 for that
*/
if ((ea & EA_MASK) >= H_PGTABLE_RANGE)
return 0;
if (!mmu_has_feature(MMU_FTR_68_BIT_VA))
va_bits = 65;
if (ssize == MMU_SEGSIZE_256M) {
vsid_bits = va_bits - SID_SHIFT;
protovsid = (context << ESID_BITS) |
((ea >> SID_SHIFT) & ESID_BITS_MASK);
return vsid_scramble(protovsid, VSID_MULTIPLIER_256M, vsid_bits);
}
/* 1T segment */
vsid_bits = va_bits - SID_SHIFT_1T;
protovsid = (context << ESID_BITS_1T) |
((ea >> SID_SHIFT_1T) & ESID_BITS_1T_MASK);
return vsid_scramble(protovsid, VSID_MULTIPLIER_1T, vsid_bits);
}
/*
* For kernel space, we use context ids as
* below. Range is 512TB per context.
*
* 0x00001 - [ 0xc000000000000000 - 0xc001ffffffffffff]
* 0x00002 - [ 0xc002000000000000 - 0xc003ffffffffffff]
* 0x00003 - [ 0xc004000000000000 - 0xc005ffffffffffff]
* 0x00004 - [ 0xc006000000000000 - 0xc007ffffffffffff]
*
* vmap, IO, vmemap
*
* 0x00005 - [ 0xc008000000000000 - 0xc009ffffffffffff]
* 0x00006 - [ 0xc00a000000000000 - 0xc00bffffffffffff]
* 0x00007 - [ 0xc00c000000000000 - 0xc00dffffffffffff]
*
*/
static inline unsigned long get_kernel_context(unsigned long ea)
{
unsigned long region_id = get_region_id(ea);
unsigned long ctx;
/*
* Depending on Kernel config, kernel region can have one context
* or more.
*/
if (region_id == LINEAR_MAP_REGION_ID) {
/*
* We already verified ea to be not beyond the addr limit.
*/
ctx = 1 + ((ea & EA_MASK) >> MAX_EA_BITS_PER_CONTEXT);
} else
ctx = region_id + MAX_KERNEL_CTX_CNT - 1;
return ctx;
}
/*
* This is only valid for addresses >= PAGE_OFFSET
*/
static inline unsigned long get_kernel_vsid(unsigned long ea, int ssize)
{
unsigned long context;
if (!is_kernel_addr(ea))
return 0;
context = get_kernel_context(ea);
return get_vsid(context, ea, ssize);
}
unsigned htab_shift_for_mem_size(unsigned long mem_size);
enum slb_index {
LINEAR_INDEX = 0, /* Kernel linear map (0xc000000000000000) */
KSTACK_INDEX = 1, /* Kernel stack map */
};
#define slb_esid_mask(ssize) \
(((ssize) == MMU_SEGSIZE_256M) ? ESID_MASK : ESID_MASK_1T)
static inline unsigned long mk_esid_data(unsigned long ea, int ssize,
enum slb_index index)
{
return (ea & slb_esid_mask(ssize)) | SLB_ESID_V | index;
}
static inline unsigned long __mk_vsid_data(unsigned long vsid, int ssize,
unsigned long flags)
{
return (vsid << slb_vsid_shift(ssize)) | flags |
((unsigned long)ssize << SLB_VSID_SSIZE_SHIFT);
}
static inline unsigned long mk_vsid_data(unsigned long ea, int ssize,
unsigned long flags)
{
return __mk_vsid_data(get_kernel_vsid(ea, ssize), ssize, flags);
}
#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_BOOK3S_64_MMU_HASH_H_ */
|