From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au,
Anton Blanchard <anton@ozlabs.org>
Cc: linuxppc-dev@lists.ozlabs.org,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: [RFC PATCH 04/17] powerpc/mm: Add hash invalidate callback
Date: Wed, 2 Aug 2017 11:10:03 +0530 [thread overview]
Message-ID: <20170802054016.8927-5-aneesh.kumar@linux.vnet.ibm.com> (raw)
In-Reply-To: <20170802054016.8927-1-aneesh.kumar@linux.vnet.ibm.com>
Add hash based invalidate callback and use that in flush_hash_page.
Note: In a later patch, we will drop the slot tracking completely. At that point
we will also loose the __rpte_sub_valid() check in
pte_iterate_hashed_subpages(). That means we call the invalidate for all
subpages irrespective of whether we took a hash fault on that or not.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/book3s/64/mmu-hash.h | 4 ++++
arch/powerpc/mm/hash_native_64.c | 27 +++++++++++++++++++++++++++
arch/powerpc/mm/hash_utils_64.c | 11 +++--------
arch/powerpc/platforms/ps3/htab.c | 22 ++++++++++++++++++++++
arch/powerpc/platforms/pseries/lpar.c | 26 ++++++++++++++++++++++++++
5 files changed, 82 insertions(+), 8 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/64/mmu-hash.h b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
index f9cce40a4035..7e1fcae472f0 100644
--- a/arch/powerpc/include/asm/book3s/64/mmu-hash.h
+++ b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
@@ -135,6 +135,10 @@ struct mmu_hash_ops {
unsigned long vpn,
int bpsize, int apsize,
int ssize, int local);
+ void (*hash_invalidate)(unsigned long hash,
+ unsigned long vpn,
+ int bpsize, int apsize,
+ int ssize, int local);
long (*hpte_updatepp)(unsigned long slot,
unsigned long newpp,
unsigned long vpn,
diff --git a/arch/powerpc/mm/hash_native_64.c b/arch/powerpc/mm/hash_native_64.c
index 4b3f6d66e7f0..ce25e125dd06 100644
--- a/arch/powerpc/mm/hash_native_64.c
+++ b/arch/powerpc/mm/hash_native_64.c
@@ -492,6 +492,32 @@ static void native_hpte_invalidate(unsigned long slot, unsigned long vpn,
local_irq_restore(flags);
}
+static void native_hash_invalidate(unsigned long hash, unsigned long vpn,
+ int bpsize, int apsize, int ssize, int local)
+{
+ unsigned long flags;
+ struct hash_pte *hptep;
+
+ DBG_LOW(" invalidate(vpn=%016lx, hash: %lx)\n", vpn, hash);
+ local_irq_save(flags);
+ hptep = native_hpte_find(hash, vpn, bpsize, ssize);
+ if (hptep) {
+ /*
+ * Invalidate the hpte. NOTE: this also unlocks it
+ */
+ hptep->v = 0;
+ }
+ /*
+ * We need to invalidate the TLB always because hpte_remove doesn't do
+ * a tlb invalidate. If a hash bucket gets full, we "evict" a more/less
+ * random entry from it. When we do that we don't invalidate the TLB
+ * (hpte_remove) because we assume the old translation is still
+ * technically "valid".
+ */
+ tlbie(vpn, bpsize, apsize, ssize, local);
+ local_irq_restore(flags);
+}
+
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static void native_hugepage_invalidate(unsigned long vsid,
unsigned long addr,
@@ -771,6 +797,7 @@ static int native_register_proc_table(unsigned long base, unsigned long page_siz
void __init hpte_init_native(void)
{
mmu_hash_ops.hpte_invalidate = native_hpte_invalidate;
+ mmu_hash_ops.hash_invalidate = native_hash_invalidate;
mmu_hash_ops.hpte_updatepp = native_hpte_updatepp;
mmu_hash_ops.hpte_updateboltedpp = native_hpte_updateboltedpp;
mmu_hash_ops.hpte_removebolted = native_hpte_removebolted;
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index ff3c9522a2b3..a02570b4cfed 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -1598,23 +1598,18 @@ static inline void tm_flush_hash_page(int local)
void flush_hash_page(unsigned long vpn, real_pte_t pte, int psize, int ssize,
unsigned long flags)
{
- unsigned long hash, index, shift, hidx, slot;
+ unsigned long hash, index, shift;
int local = flags & HPTE_LOCAL_UPDATE;
DBG_LOW("flush_hash_page(vpn=%016lx)\n", vpn);
pte_iterate_hashed_subpages(pte, psize, vpn, index, shift) {
hash = hpt_hash(vpn, shift, ssize);
- hidx = __rpte_to_hidx(pte, index);
- if (hidx & _PTEIDX_SECONDARY)
- hash = ~hash;
- slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
- slot += hidx & _PTEIDX_GROUP_IX;
- DBG_LOW(" sub %ld: hash=%lx, hidx=%lx\n", index, slot, hidx);
+ DBG_LOW(" sub %ld: hash=%lx\n", index, hash);
/*
* We use same base page size and actual psize, because we don't
* use these functions for hugepage
*/
- mmu_hash_ops.hpte_invalidate(slot, vpn, psize, psize,
+ mmu_hash_ops.hash_invalidate(hash, vpn, psize, psize,
ssize, local);
} pte_iterate_hashed_end();
diff --git a/arch/powerpc/platforms/ps3/htab.c b/arch/powerpc/platforms/ps3/htab.c
index 255b7a33fefe..813c2f77f75d 100644
--- a/arch/powerpc/platforms/ps3/htab.c
+++ b/arch/powerpc/platforms/ps3/htab.c
@@ -230,9 +230,31 @@ static long ps3_hpte_find(unsigned long hash, unsigned long want_v)
return -1;
}
+static void ps3_hash_invalidate(unsigned long hash, unsigned long vpn,
+ int psize, int apsize, int ssize, int local)
+{
+ long slot;
+ unsigned long flags;
+ unsigned long want_v;
+
+ want_v = hpte_encode_avpn(vpn, psize, ssize);
+
+ spin_lock_irqsave(&ps3_htab_lock, flags);
+ slot = ps3_hpte_find(hash, want_v);
+ if (slot < 0)
+ /* HPTE not found */
+ goto err_out;
+ /* invalidate the entry */
+ lv1_write_htab_entry(PS3_LPAR_VAS_ID_CURRENT, slot, 0, 0);
+err_out:
+ spin_unlock_irqrestore(&ps3_htab_lock, flags);
+ return;
+}
+
void __init ps3_hpte_init(unsigned long htab_size)
{
mmu_hash_ops.hpte_invalidate = ps3_hpte_invalidate;
+ mmu_hash_ops.hash_invalidate = ps3_hash_invalidate;
mmu_hash_ops.hpte_updatepp = ps3_hpte_updatepp;
mmu_hash_ops.hpte_updateboltedpp = ps3_hpte_updateboltedpp;
mmu_hash_ops.hpte_insert = ps3_hpte_insert;
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index edab68d9f9f3..e366252e0e93 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -419,6 +419,31 @@ static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long vpn,
BUG_ON(lpar_rc != H_SUCCESS);
}
+static void pSeries_lpar_hash_invalidate(unsigned long hash, unsigned long vpn,
+ int psize, int apsize,
+ int ssize, int local)
+{
+ long slot;
+ unsigned long want_v;
+ unsigned long lpar_rc;
+ unsigned long dummy1, dummy2;
+
+ pr_devel(" inval : hash=%lx, vpn=%016lx, psize: %d, local: %d\n",
+ hash, vpn, psize, local);
+
+ want_v = hpte_encode_avpn(vpn, psize, ssize);
+ slot = __pSeries_lpar_hpte_find(hash, want_v);
+ if (slot < 0)
+ /* HPTE not found */
+ return;
+ lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2);
+ if (lpar_rc == H_NOT_FOUND)
+ return;
+
+ BUG_ON(lpar_rc != H_SUCCESS);
+}
+
+
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/*
* Limit iterations holding pSeries_lpar_tlbie_lock to 3. We also need
@@ -758,6 +783,7 @@ static int pseries_lpar_register_process_table(unsigned long base,
void __init hpte_init_pseries(void)
{
mmu_hash_ops.hpte_invalidate = pSeries_lpar_hpte_invalidate;
+ mmu_hash_ops.hash_invalidate = pSeries_lpar_hash_invalidate;
mmu_hash_ops.hpte_updatepp = pSeries_lpar_hpte_updatepp;
mmu_hash_ops.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
mmu_hash_ops.hpte_insert = pSeries_lpar_hpte_insert;
--
2.13.3
next prev parent reply other threads:[~2017-08-02 5:41 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-02 5:39 [RFC PATCH 00/17] Remove slot tracking from linux page table Aneesh Kumar K.V
2017-08-02 5:40 ` [RFC PATCH 01/17] powerpc/mm: Update native_hpte_find to return hash pte Aneesh Kumar K.V
2017-08-02 5:40 ` [RFC PATCH 02/17] powerpc/pseries: Update hpte find helper to take hash value Aneesh Kumar K.V
2017-08-02 5:40 ` [RFC PATCH 03/17] powerpc/ps3/mm: Add helper for finding hash pte slot using " Aneesh Kumar K.V
2017-08-02 5:40 ` Aneesh Kumar K.V [this message]
2017-08-02 5:40 ` [RFC PATCH 05/17] powerpc/mm: use hash_invalidate for __kernel_map_pages() Aneesh Kumar K.V
2017-08-02 5:40 ` [RFC PATCH 06/17] powerpc/mm: Switch flush_hash_range to not use slot Aneesh Kumar K.V
2017-08-02 5:40 ` [RFC PATCH 07/17] powerpc/mm: Add hash updatepp callback Aneesh Kumar K.V
2017-08-02 5:40 ` [RFC PATCH 08/17] powerpc/mm/hash: Don't track hash pte slot number in linux page table Aneesh Kumar K.V
2017-08-02 5:40 ` [RFC PATCH 09/17] powerpc/mm: Remove unused flag arg in global_invalidates Aneesh Kumar K.V
2017-08-02 5:40 ` [RFC PATCH 10/17] powerpc/mm: Add new firmware feature HASH API Aneesh Kumar K.V
2017-08-02 5:40 ` [RFC PATCH 11/17] powerpc/kvm/hash: Implement HASH_REMOVE hcall Aneesh Kumar K.V
2017-08-02 5:40 ` [RFC PATCH 12/17] powerpc/kvm/hash: Implement HASH_PROTECT hcall Aneesh Kumar K.V
2017-08-02 5:40 ` [RFC PATCH 13/17] powerpc/kvm/hash: Implement HASH_BULK_REMOVE hcall Aneesh Kumar K.V
2017-08-02 5:40 ` [RFC PATCH 14/17] powerpc/mm/pseries: Use HASH_PROTECT hcall in guest Aneesh Kumar K.V
2017-08-02 5:40 ` [RFC PATCH 15/17] powerpc/mm/pseries: Use HASH_REMOVE " Aneesh Kumar K.V
2017-08-02 5:40 ` [RFC PATCH 16/17] powerpc/mm/pseries: Move slot based bulk remove to helper Aneesh Kumar K.V
2017-08-02 12:50 ` Segher Boessenkool
2017-08-02 5:40 ` [RFC PATCH 17/17] powerpc/mm/pseries: Use HASH_BULK_REMOVE hcall in guest Aneesh Kumar K.V
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