mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-09 01:28:05 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
245
arch/powerpc/mm/hugepage-hash64.c
Normal file
245
arch/powerpc/mm/hugepage-hash64.c
Normal file
|
|
@ -0,0 +1,245 @@
|
|||
/*
|
||||
* Copyright IBM Corporation, 2013
|
||||
* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of version 2.1 of the GNU Lesser General Public License
|
||||
* as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it would be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
||||
*
|
||||
*/
|
||||
|
||||
/*
|
||||
* PPC64 THP Support for hash based MMUs
|
||||
*/
|
||||
#include <linux/mm.h>
|
||||
#include <asm/machdep.h>
|
||||
|
||||
static void invalidate_old_hpte(unsigned long vsid, unsigned long addr,
|
||||
pmd_t *pmdp, unsigned int psize, int ssize)
|
||||
{
|
||||
int i, max_hpte_count, valid;
|
||||
unsigned long s_addr;
|
||||
unsigned char *hpte_slot_array;
|
||||
unsigned long hidx, shift, vpn, hash, slot;
|
||||
|
||||
s_addr = addr & HPAGE_PMD_MASK;
|
||||
hpte_slot_array = get_hpte_slot_array(pmdp);
|
||||
/*
|
||||
* IF we try to do a HUGE PTE update after a withdraw is done.
|
||||
* we will find the below NULL. This happens when we do
|
||||
* split_huge_page_pmd
|
||||
*/
|
||||
if (!hpte_slot_array)
|
||||
return;
|
||||
|
||||
if (ppc_md.hugepage_invalidate)
|
||||
return ppc_md.hugepage_invalidate(vsid, s_addr, hpte_slot_array,
|
||||
psize, ssize);
|
||||
/*
|
||||
* No bluk hpte removal support, invalidate each entry
|
||||
*/
|
||||
shift = mmu_psize_defs[psize].shift;
|
||||
max_hpte_count = HPAGE_PMD_SIZE >> shift;
|
||||
for (i = 0; i < max_hpte_count; i++) {
|
||||
/*
|
||||
* 8 bits per each hpte entries
|
||||
* 000| [ secondary group (one bit) | hidx (3 bits) | valid bit]
|
||||
*/
|
||||
valid = hpte_valid(hpte_slot_array, i);
|
||||
if (!valid)
|
||||
continue;
|
||||
hidx = hpte_hash_index(hpte_slot_array, i);
|
||||
|
||||
/* get the vpn */
|
||||
addr = s_addr + (i * (1ul << shift));
|
||||
vpn = hpt_vpn(addr, vsid, ssize);
|
||||
hash = hpt_hash(vpn, shift, ssize);
|
||||
if (hidx & _PTEIDX_SECONDARY)
|
||||
hash = ~hash;
|
||||
|
||||
slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
|
||||
slot += hidx & _PTEIDX_GROUP_IX;
|
||||
ppc_md.hpte_invalidate(slot, vpn, psize,
|
||||
MMU_PAGE_16M, ssize, 0);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int __hash_page_thp(unsigned long ea, unsigned long access, unsigned long vsid,
|
||||
pmd_t *pmdp, unsigned long trap, int local, int ssize,
|
||||
unsigned int psize)
|
||||
{
|
||||
unsigned int index, valid;
|
||||
unsigned char *hpte_slot_array;
|
||||
unsigned long rflags, pa, hidx;
|
||||
unsigned long old_pmd, new_pmd;
|
||||
int ret, lpsize = MMU_PAGE_16M;
|
||||
unsigned long vpn, hash, shift, slot;
|
||||
|
||||
/*
|
||||
* atomically mark the linux large page PMD busy and dirty
|
||||
*/
|
||||
do {
|
||||
pmd_t pmd = ACCESS_ONCE(*pmdp);
|
||||
|
||||
old_pmd = pmd_val(pmd);
|
||||
/* If PMD busy, retry the access */
|
||||
if (unlikely(old_pmd & _PAGE_BUSY))
|
||||
return 0;
|
||||
/* If PMD is trans splitting retry the access */
|
||||
if (unlikely(old_pmd & _PAGE_SPLITTING))
|
||||
return 0;
|
||||
/* If PMD permissions don't match, take page fault */
|
||||
if (unlikely(access & ~old_pmd))
|
||||
return 1;
|
||||
/*
|
||||
* Try to lock the PTE, add ACCESSED and DIRTY if it was
|
||||
* a write access
|
||||
*/
|
||||
new_pmd = old_pmd | _PAGE_BUSY | _PAGE_ACCESSED;
|
||||
if (access & _PAGE_RW)
|
||||
new_pmd |= _PAGE_DIRTY;
|
||||
} while (old_pmd != __cmpxchg_u64((unsigned long *)pmdp,
|
||||
old_pmd, new_pmd));
|
||||
/*
|
||||
* PP bits. _PAGE_USER is already PP bit 0x2, so we only
|
||||
* need to add in 0x1 if it's a read-only user page
|
||||
*/
|
||||
rflags = new_pmd & _PAGE_USER;
|
||||
if ((new_pmd & _PAGE_USER) && !((new_pmd & _PAGE_RW) &&
|
||||
(new_pmd & _PAGE_DIRTY)))
|
||||
rflags |= 0x1;
|
||||
/*
|
||||
* _PAGE_EXEC -> HW_NO_EXEC since it's inverted
|
||||
*/
|
||||
rflags |= ((new_pmd & _PAGE_EXEC) ? 0 : HPTE_R_N);
|
||||
|
||||
#if 0
|
||||
if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) {
|
||||
|
||||
/*
|
||||
* No CPU has hugepages but lacks no execute, so we
|
||||
* don't need to worry about that case
|
||||
*/
|
||||
rflags = hash_page_do_lazy_icache(rflags, __pte(old_pte), trap);
|
||||
}
|
||||
#endif
|
||||
/*
|
||||
* Find the slot index details for this ea, using base page size.
|
||||
*/
|
||||
shift = mmu_psize_defs[psize].shift;
|
||||
index = (ea & ~HPAGE_PMD_MASK) >> shift;
|
||||
BUG_ON(index >= 4096);
|
||||
|
||||
vpn = hpt_vpn(ea, vsid, ssize);
|
||||
hash = hpt_hash(vpn, shift, ssize);
|
||||
hpte_slot_array = get_hpte_slot_array(pmdp);
|
||||
if (psize == MMU_PAGE_4K) {
|
||||
/*
|
||||
* invalidate the old hpte entry if we have that mapped via 64K
|
||||
* base page size. This is because demote_segment won't flush
|
||||
* hash page table entries.
|
||||
*/
|
||||
if ((old_pmd & _PAGE_HASHPTE) && !(old_pmd & _PAGE_COMBO))
|
||||
invalidate_old_hpte(vsid, ea, pmdp, MMU_PAGE_64K, ssize);
|
||||
}
|
||||
|
||||
valid = hpte_valid(hpte_slot_array, index);
|
||||
if (valid) {
|
||||
/* update the hpte bits */
|
||||
hidx = hpte_hash_index(hpte_slot_array, index);
|
||||
if (hidx & _PTEIDX_SECONDARY)
|
||||
hash = ~hash;
|
||||
slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
|
||||
slot += hidx & _PTEIDX_GROUP_IX;
|
||||
|
||||
ret = ppc_md.hpte_updatepp(slot, rflags, vpn,
|
||||
psize, lpsize, ssize, local);
|
||||
/*
|
||||
* We failed to update, try to insert a new entry.
|
||||
*/
|
||||
if (ret == -1) {
|
||||
/*
|
||||
* large pte is marked busy, so we can be sure
|
||||
* nobody is looking at hpte_slot_array. hence we can
|
||||
* safely update this here.
|
||||
*/
|
||||
valid = 0;
|
||||
hpte_slot_array[index] = 0;
|
||||
}
|
||||
}
|
||||
|
||||
if (!valid) {
|
||||
unsigned long hpte_group;
|
||||
|
||||
/* insert new entry */
|
||||
pa = pmd_pfn(__pmd(old_pmd)) << PAGE_SHIFT;
|
||||
new_pmd |= _PAGE_HASHPTE;
|
||||
|
||||
/* Add in WIMG bits */
|
||||
rflags |= (new_pmd & (_PAGE_WRITETHRU | _PAGE_NO_CACHE |
|
||||
_PAGE_GUARDED));
|
||||
/*
|
||||
* enable the memory coherence always
|
||||
*/
|
||||
rflags |= HPTE_R_M;
|
||||
repeat:
|
||||
hpte_group = ((hash & htab_hash_mask) * HPTES_PER_GROUP) & ~0x7UL;
|
||||
|
||||
/* Insert into the hash table, primary slot */
|
||||
slot = ppc_md.hpte_insert(hpte_group, vpn, pa, rflags, 0,
|
||||
psize, lpsize, ssize);
|
||||
/*
|
||||
* Primary is full, try the secondary
|
||||
*/
|
||||
if (unlikely(slot == -1)) {
|
||||
hpte_group = ((~hash & htab_hash_mask) *
|
||||
HPTES_PER_GROUP) & ~0x7UL;
|
||||
slot = ppc_md.hpte_insert(hpte_group, vpn, pa,
|
||||
rflags, HPTE_V_SECONDARY,
|
||||
psize, lpsize, ssize);
|
||||
if (slot == -1) {
|
||||
if (mftb() & 0x1)
|
||||
hpte_group = ((hash & htab_hash_mask) *
|
||||
HPTES_PER_GROUP) & ~0x7UL;
|
||||
|
||||
ppc_md.hpte_remove(hpte_group);
|
||||
goto repeat;
|
||||
}
|
||||
}
|
||||
/*
|
||||
* Hypervisor failure. Restore old pmd and return -1
|
||||
* similar to __hash_page_*
|
||||
*/
|
||||
if (unlikely(slot == -2)) {
|
||||
*pmdp = __pmd(old_pmd);
|
||||
hash_failure_debug(ea, access, vsid, trap, ssize,
|
||||
psize, lpsize, old_pmd);
|
||||
return -1;
|
||||
}
|
||||
/*
|
||||
* large pte is marked busy, so we can be sure
|
||||
* nobody is looking at hpte_slot_array. hence we can
|
||||
* safely update this here.
|
||||
*/
|
||||
mark_hpte_slot_valid(hpte_slot_array, index, slot);
|
||||
}
|
||||
/*
|
||||
* Mark the pte with _PAGE_COMBO, if we are trying to hash it with
|
||||
* base page size 4k.
|
||||
*/
|
||||
if (psize == MMU_PAGE_4K)
|
||||
new_pmd |= _PAGE_COMBO;
|
||||
/*
|
||||
* The hpte valid is stored in the pgtable whose address is in the
|
||||
* second half of the PMD. Order this against clearing of the busy bit in
|
||||
* huge pmd.
|
||||
*/
|
||||
smp_wmb();
|
||||
*pmdp = __pmd(new_pmd & ~_PAGE_BUSY);
|
||||
return 0;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue