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powerpc/mm/book3s64/radix: Off-load TLB invalidations to host when !GTSE 

When platform doesn't support GTSE, let TLB invalidation requests
for radix guests be off-loaded to the host using H_RPT_INVALIDATE
hcall.

	[hcall wrapper, error path handling and renames]

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200703053608.12884-4-bharata@linux.ibm.com
This commit is contained in:
Nicholas Piggin 2020-07-03 11:06:08 +05:30 committed by Michael Ellerman
parent b6c8417507
commit dd3d9aa558
4 changed files with 175 additions and 8 deletions
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15
arch/powerpc/include/asm/book3s/64/tlbflush-radix.h
View File

@ -2,10 +2,25 @@
#ifndef _ASM_POWERPC_TLBFLUSH_RADIX_H
#define _ASM_POWERPC_TLBFLUSH_RADIX_H
#include <asm/hvcall.h>
struct vm_area_struct;
struct mm_struct;
struct mmu_gather;
static inline u64 psize_to_rpti_pgsize(unsigned long psize)
{
if (psize == MMU_PAGE_4K)
return H_RPTI_PAGE_4K;
if (psize == MMU_PAGE_64K)
return H_RPTI_PAGE_64K;
if (psize == MMU_PAGE_2M)
return H_RPTI_PAGE_2M;
if (psize == MMU_PAGE_1G)
return H_RPTI_PAGE_1G;
return H_RPTI_PAGE_ALL;
}
static inline int mmu_get_ap(int psize)
{
return mmu_psize_defs[psize].ap;

34
arch/powerpc/include/asm/hvcall.h
View File

@ -305,7 +305,8 @@
#define H_SCM_UNBIND_ALL 0x3FC
#define H_SCM_HEALTH 0x400
#define H_SCM_PERFORMANCE_STATS 0x418
#define MAX_HCALL_OPCODE H_SCM_PERFORMANCE_STATS
#define H_RPT_INVALIDATE 0x448
#define MAX_HCALL_OPCODE H_RPT_INVALIDATE
/* Scope args for H_SCM_UNBIND_ALL */
#define H_UNBIND_SCOPE_ALL (0x1)
@ -389,6 +390,37 @@
#define PROC_TABLE_RADIX 0x04
#define PROC_TABLE_GTSE 0x01
/*
* Defines for
* H_RPT_INVALIDATE - Invalidate RPT translation lookaside information.
*/
/* Type of translation to invalidate (type) */
#define H_RPTI_TYPE_NESTED 0x0001 /* Invalidate nested guest partition-scope */
#define H_RPTI_TYPE_TLB 0x0002 /* Invalidate TLB */
#define H_RPTI_TYPE_PWC 0x0004 /* Invalidate Page Walk Cache */
/* Invalidate Process Table Entries if H_RPTI_TYPE_NESTED is clear */
#define H_RPTI_TYPE_PRT 0x0008
/* Invalidate Partition Table Entries if H_RPTI_TYPE_NESTED is set */
#define H_RPTI_TYPE_PAT 0x0008
#define H_RPTI_TYPE_ALL (H_RPTI_TYPE_TLB | H_RPTI_TYPE_PWC | \
H_RPTI_TYPE_PRT)
#define H_RPTI_TYPE_NESTED_ALL (H_RPTI_TYPE_TLB | H_RPTI_TYPE_PWC | \
H_RPTI_TYPE_PAT)
/* Invalidation targets (target) */
#define H_RPTI_TARGET_CMMU 0x01 /* All virtual processors in the partition */
#define H_RPTI_TARGET_CMMU_LOCAL 0x02 /* Current virtual processor */
/* All nest/accelerator agents in use by the partition */
#define H_RPTI_TARGET_NMMU 0x04
/* Page size mask (page sizes) */
#define H_RPTI_PAGE_4K 0x01
#define H_RPTI_PAGE_64K 0x02
#define H_RPTI_PAGE_2M 0x04
#define H_RPTI_PAGE_1G 0x08
#define H_RPTI_PAGE_ALL (-1UL)
#ifndef __ASSEMBLY__
#include <linux/types.h>

52
arch/powerpc/include/asm/plpar_wrappers.h
View File

@ -334,6 +334,51 @@ static inline long plpar_get_cpu_characteristics(struct h_cpu_char_result *p)
return rc;
}
/*
* Wrapper to H_RPT_INVALIDATE hcall that handles return values appropriately
*
* - Returns H_SUCCESS on success
* - For H_BUSY return value, we retry the hcall.
* - For any other hcall failures, attempt a full flush once before
* resorting to BUG().
*
* Note: This hcall is expected to fail only very rarely. The correct
* error recovery of killing the process/guest will be eventually
* needed.
*/
static inline long pseries_rpt_invalidate(u32 pid, u64 target, u64 type,
u64 page_sizes, u64 start, u64 end)
{
long rc;
unsigned long all;
while (true) {
rc = plpar_hcall_norets(H_RPT_INVALIDATE, pid, target, type,
page_sizes, start, end);
if (rc == H_BUSY) {
cpu_relax();
continue;
} else if (rc == H_SUCCESS)
return rc;
/* Flush request failed, try with a full flush once */
if (type & H_RPTI_TYPE_NESTED)
all = H_RPTI_TYPE_NESTED | H_RPTI_TYPE_NESTED_ALL;
else
all = H_RPTI_TYPE_ALL;
retry:
rc = plpar_hcall_norets(H_RPT_INVALIDATE, pid, target,
all, page_sizes, 0, -1UL);
if (rc == H_BUSY) {
cpu_relax();
goto retry;
} else if (rc == H_SUCCESS)
return rc;
BUG();
}
}
#else /* !CONFIG_PPC_PSERIES */
static inline long plpar_set_ciabr(unsigned long ciabr)
@ -346,6 +391,13 @@ static inline long plpar_pte_read_4(unsigned long flags, unsigned long ptex,
{
return 0;
}
static inline long pseries_rpt_invalidate(u32 pid, u64 target, u64 type,
u64 page_sizes, u64 start, u64 end)
{
return 0;
}
#endif /* CONFIG_PPC_PSERIES */
#endif /* _ASM_POWERPC_PLPAR_WRAPPERS_H */

82
arch/powerpc/mm/book3s64/radix_tlb.c
View File

@ -16,6 +16,7 @@
#include <asm/tlbflush.h>
#include <asm/trace.h>
#include <asm/cputhreads.h>
#include <asm/plpar_wrappers.h>
#define RIC_FLUSH_TLB 0
#define RIC_FLUSH_PWC 1
@ -694,7 +695,14 @@ void radix__flush_tlb_mm(struct mm_struct *mm)
goto local;
}
if (cputlb_use_tlbie()) {
if (!mmu_has_feature(MMU_FTR_GTSE)) {
unsigned long tgt = H_RPTI_TARGET_CMMU;
if (atomic_read(&mm->context.copros) > 0)
tgt |= H_RPTI_TARGET_NMMU;
pseries_rpt_invalidate(pid, tgt, H_RPTI_TYPE_TLB,
H_RPTI_PAGE_ALL, 0, -1UL);
} else if (cputlb_use_tlbie()) {
if (mm_needs_flush_escalation(mm))
_tlbie_pid(pid, RIC_FLUSH_ALL);
else
@ -727,7 +735,16 @@ static void __flush_all_mm(struct mm_struct *mm, bool fullmm)
goto local;
}
}
if (cputlb_use_tlbie())
if (!mmu_has_feature(MMU_FTR_GTSE)) {
unsigned long tgt = H_RPTI_TARGET_CMMU;
unsigned long type = H_RPTI_TYPE_TLB | H_RPTI_TYPE_PWC |
H_RPTI_TYPE_PRT;
if (atomic_read(&mm->context.copros) > 0)
tgt |= H_RPTI_TARGET_NMMU;
pseries_rpt_invalidate(pid, tgt, type,
H_RPTI_PAGE_ALL, 0, -1UL);
} else if (cputlb_use_tlbie())
_tlbie_pid(pid, RIC_FLUSH_ALL);
else
_tlbiel_pid_multicast(mm, pid, RIC_FLUSH_ALL);
@ -760,7 +777,19 @@ void radix__flush_tlb_page_psize(struct mm_struct *mm, unsigned long vmaddr,
exit_flush_lazy_tlbs(mm);
goto local;
}
if (cputlb_use_tlbie())
if (!mmu_has_feature(MMU_FTR_GTSE)) {
unsigned long tgt, pg_sizes, size;
tgt = H_RPTI_TARGET_CMMU;
pg_sizes = psize_to_rpti_pgsize(psize);
size = 1UL << mmu_psize_to_shift(psize);
if (atomic_read(&mm->context.copros) > 0)
tgt |= H_RPTI_TARGET_NMMU;
pseries_rpt_invalidate(pid, tgt, H_RPTI_TYPE_TLB,
pg_sizes, vmaddr,
vmaddr + size);
} else if (cputlb_use_tlbie())
_tlbie_va(vmaddr, pid, psize, RIC_FLUSH_TLB);
else
_tlbiel_va_multicast(mm, vmaddr, pid, psize, RIC_FLUSH_TLB);
@ -810,7 +839,14 @@ static inline void _tlbiel_kernel_broadcast(void)
*/
void radix__flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
if (cputlb_use_tlbie())
if (!mmu_has_feature(MMU_FTR_GTSE)) {
unsigned long tgt = H_RPTI_TARGET_CMMU | H_RPTI_TARGET_NMMU;
unsigned long type = H_RPTI_TYPE_TLB | H_RPTI_TYPE_PWC |
H_RPTI_TYPE_PRT;
pseries_rpt_invalidate(0, tgt, type, H_RPTI_PAGE_ALL,
start, end);
} else if (cputlb_use_tlbie())
_tlbie_pid(0, RIC_FLUSH_ALL);
else
_tlbiel_kernel_broadcast();
@ -864,7 +900,17 @@ static inline void __radix__flush_tlb_range(struct mm_struct *mm,
nr_pages > tlb_local_single_page_flush_ceiling);
}
if (full) {
if (!mmu_has_feature(MMU_FTR_GTSE) && !local) {
unsigned long tgt = H_RPTI_TARGET_CMMU;
unsigned long pg_sizes = psize_to_rpti_pgsize(mmu_virtual_psize);
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
pg_sizes |= psize_to_rpti_pgsize(MMU_PAGE_2M);
if (atomic_read(&mm->context.copros) > 0)
tgt |= H_RPTI_TARGET_NMMU;
pseries_rpt_invalidate(pid, tgt, H_RPTI_TYPE_TLB, pg_sizes,
start, end);
} else if (full) {
if (local) {
_tlbiel_pid(pid, RIC_FLUSH_TLB);
} else {
@ -1046,7 +1092,17 @@ static __always_inline void __radix__flush_tlb_range_psize(struct mm_struct *mm,
nr_pages > tlb_local_single_page_flush_ceiling);
}
if (full) {
if (!mmu_has_feature(MMU_FTR_GTSE) && !local) {
unsigned long tgt = H_RPTI_TARGET_CMMU;
unsigned long type = H_RPTI_TYPE_TLB;
unsigned long pg_sizes = psize_to_rpti_pgsize(psize);
if (also_pwc)
type |= H_RPTI_TYPE_PWC;
if (atomic_read(&mm->context.copros) > 0)
tgt |= H_RPTI_TARGET_NMMU;
pseries_rpt_invalidate(pid, tgt, type, pg_sizes, start, end);
} else if (full) {
if (local) {
_tlbiel_pid(pid, also_pwc ? RIC_FLUSH_ALL : RIC_FLUSH_TLB);
} else {
@ -1111,7 +1167,19 @@ void radix__flush_tlb_collapsed_pmd(struct mm_struct *mm, unsigned long addr)
exit_flush_lazy_tlbs(mm);
goto local;
}
if (cputlb_use_tlbie())
if (!mmu_has_feature(MMU_FTR_GTSE)) {
unsigned long tgt, type, pg_sizes;
tgt = H_RPTI_TARGET_CMMU;
type = H_RPTI_TYPE_TLB | H_RPTI_TYPE_PWC |
H_RPTI_TYPE_PRT;
pg_sizes = psize_to_rpti_pgsize(mmu_virtual_psize);
if (atomic_read(&mm->context.copros) > 0)
tgt |= H_RPTI_TARGET_NMMU;
pseries_rpt_invalidate(pid, tgt, type, pg_sizes,
addr, end);
} else if (cputlb_use_tlbie())
_tlbie_va_range(addr, end, pid, PAGE_SIZE, mmu_virtual_psize, true);
else
_tlbiel_va_range_multicast(mm,