v1 -> v2:
base on (add02cfdc9bc2 "iommu: Introduce Interface for IOMMU TLB Flushing")
Zhen Lei (3):
iommu/arm-smmu-v3: put off the execution of TLBI* to reduce lock
confliction
iommu/arm-smmu-v3: add support for unmap an iova range with only one
tlb sync
iommu/arm-smmu: add support for unmap a memory range with only one tlb
sync
drivers/iommu/arm-smmu-v3.c | 52 ++++++++++++++++++++++++++++++++++----
drivers/iommu/arm-smmu.c | 10 ++++++++
drivers/iommu/io-pgtable-arm-v7s.c | 32 +++++++++++++++--------
drivers/iommu/io-pgtable-arm.c | 30 ++++++++++++++--------
drivers/iommu/io-pgtable.h | 1 +
5 files changed, 99 insertions(+), 26 deletions(-)
--
2.5.0
Because all TLBI commands should be followed by a SYNC command, to make
sure that it has been completely finished. So we can just add the TLBI
commands into the queue, and put off the execution until meet SYNC or
other commands. To prevent the followed SYNC command waiting for a long
time because of too many commands have been delayed, restrict the max
delayed number.
According to my test, I got the same performance data as I replaced writel
with writel_relaxed in queue_inc_prod.
Signed-off-by: Zhen Lei <[email protected]>
---
drivers/iommu/arm-smmu-v3.c | 42 +++++++++++++++++++++++++++++++++++++-----
1 file changed, 37 insertions(+), 5 deletions(-)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index e67ba6c..ef42c4b 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -337,6 +337,7 @@
/* Command queue */
#define CMDQ_ENT_DWORDS 2
#define CMDQ_MAX_SZ_SHIFT 8
+#define CMDQ_MAX_DELAYED 32
#define CMDQ_ERR_SHIFT 24
#define CMDQ_ERR_MASK 0x7f
@@ -482,6 +483,7 @@ struct arm_smmu_cmdq_ent {
};
} cfgi;
+ #define CMDQ_OP_TLBI_NH_ALL 0x10
#define CMDQ_OP_TLBI_NH_ASID 0x11
#define CMDQ_OP_TLBI_NH_VA 0x12
#define CMDQ_OP_TLBI_EL2_ALL 0x20
@@ -509,6 +511,7 @@ struct arm_smmu_cmdq_ent {
struct arm_smmu_queue {
int irq; /* Wired interrupt */
+ u32 nr_delay;
__le64 *base;
dma_addr_t base_dma;
@@ -745,11 +748,16 @@ static int queue_sync_prod(struct arm_smmu_queue *q)
return ret;
}
-static void queue_inc_prod(struct arm_smmu_queue *q)
+static void queue_inc_swprod(struct arm_smmu_queue *q)
{
- u32 prod = (Q_WRP(q, q->prod) | Q_IDX(q, q->prod)) + 1;
+ u32 prod = q->prod + 1;
q->prod = Q_OVF(q, q->prod) | Q_WRP(q, prod) | Q_IDX(q, prod);
+}
+
+static void queue_inc_prod(struct arm_smmu_queue *q)
+{
+ queue_inc_swprod(q);
writel(q->prod, q->prod_reg);
}
@@ -791,13 +799,24 @@ static void queue_write(__le64 *dst, u64 *src, size_t n_dwords)
*dst++ = cpu_to_le64(*src++);
}
-static int queue_insert_raw(struct arm_smmu_queue *q, u64 *ent)
+static int queue_insert_raw(struct arm_smmu_queue *q, u64 *ent, int optimize)
{
if (queue_full(q))
return -ENOSPC;
queue_write(Q_ENT(q, q->prod), ent, q->ent_dwords);
- queue_inc_prod(q);
+
+ /*
+ * We don't want too many commands to be delayed, this may lead the
+ * followed sync command to wait for a long time.
+ */
+ if (optimize && (++q->nr_delay < CMDQ_MAX_DELAYED)) {
+ queue_inc_swprod(q);
+ } else {
+ queue_inc_prod(q);
+ q->nr_delay = 0;
+ }
+
return 0;
}
@@ -939,6 +958,7 @@ static void arm_smmu_cmdq_skip_err(struct arm_smmu_device *smmu)
static void arm_smmu_cmdq_issue_cmd(struct arm_smmu_device *smmu,
struct arm_smmu_cmdq_ent *ent)
{
+ int optimize = 0;
u64 cmd[CMDQ_ENT_DWORDS];
unsigned long flags;
bool wfe = !!(smmu->features & ARM_SMMU_FEAT_SEV);
@@ -950,8 +970,17 @@ static void arm_smmu_cmdq_issue_cmd(struct arm_smmu_device *smmu,
return;
}
+ /*
+ * All TLBI commands should be followed by a sync command later.
+ * The CFGI commands is the same, but they are rarely executed.
+ * So just optimize TLBI commands now, to reduce the "if" judgement.
+ */
+ if ((ent->opcode >= CMDQ_OP_TLBI_NH_ALL) &&
+ (ent->opcode <= CMDQ_OP_TLBI_NSNH_ALL))
+ optimize = 1;
+
spin_lock_irqsave(&smmu->cmdq.lock, flags);
- while (queue_insert_raw(q, cmd) == -ENOSPC) {
+ while (queue_insert_raw(q, cmd, optimize) == -ENOSPC) {
if (queue_poll_cons(q, false, wfe))
dev_err_ratelimited(smmu->dev, "CMDQ timeout\n");
}
@@ -2001,6 +2030,8 @@ static int arm_smmu_init_one_queue(struct arm_smmu_device *smmu,
<< Q_BASE_LOG2SIZE_SHIFT;
q->prod = q->cons = 0;
+ q->nr_delay = 0;
+
return 0;
}
@@ -2584,6 +2615,7 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu)
dev_err(smmu->dev, "unit-length command queue not supported\n");
return -ENXIO;
}
+ BUILD_BUG_ON(CMDQ_MAX_DELAYED >= (1 << CMDQ_MAX_SZ_SHIFT));
smmu->evtq.q.max_n_shift = min((u32)EVTQ_MAX_SZ_SHIFT,
reg >> IDR1_EVTQ_SHIFT & IDR1_EVTQ_MASK);
--
2.5.0
This patch is base on:
(add02cfdc9bc2 "iommu: Introduce Interface for IOMMU TLB Flushing")
Because iotlb_sync is moved out of ".unmap = arm_smmu_unmap", some interval
".unmap" calls should explicitly followed by a iotlb_sync operation.
Signed-off-by: Zhen Lei <[email protected]>
---
drivers/iommu/arm-smmu.c | 10 ++++++++++
drivers/iommu/io-pgtable-arm-v7s.c | 32 +++++++++++++++++++++-----------
2 files changed, 31 insertions(+), 11 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 3bdb799..bb57d67 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1259,6 +1259,15 @@ static size_t arm_smmu_unmap(struct iommu_domain *domain, unsigned long iova,
return ops->unmap(ops, iova, size);
}
+static void arm_smmu_iotlb_sync(struct iommu_domain *domain)
+{
+ struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ struct io_pgtable_ops *ops = smmu_domain->pgtbl_ops;
+
+ if (ops && ops->iotlb_sync)
+ ops->iotlb_sync(ops);
+}
+
static phys_addr_t arm_smmu_iova_to_phys_hard(struct iommu_domain *domain,
dma_addr_t iova)
{
@@ -1561,6 +1570,7 @@ static struct iommu_ops arm_smmu_ops = {
.attach_dev = arm_smmu_attach_dev,
.map = arm_smmu_map,
.unmap = arm_smmu_unmap,
+ .iotlb_sync = arm_smmu_iotlb_sync,
.map_sg = default_iommu_map_sg,
.iova_to_phys = arm_smmu_iova_to_phys,
.add_device = arm_smmu_add_device,
diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c
index d665d0d..457ad29 100644
--- a/drivers/iommu/io-pgtable-arm-v7s.c
+++ b/drivers/iommu/io-pgtable-arm-v7s.c
@@ -370,6 +370,8 @@ static int arm_v7s_init_pte(struct arm_v7s_io_pgtable *data,
for (i = 0; i < num_entries; i++)
if (ARM_V7S_PTE_IS_TABLE(ptep[i], lvl)) {
+ size_t unmapped;
+
/*
* We need to unmap and free the old table before
* overwriting it with a block entry.
@@ -378,8 +380,10 @@ static int arm_v7s_init_pte(struct arm_v7s_io_pgtable *data,
size_t sz = ARM_V7S_BLOCK_SIZE(lvl);
tblp = ptep - ARM_V7S_LVL_IDX(iova, lvl);
- if (WARN_ON(__arm_v7s_unmap(data, iova + i * sz,
- sz, lvl, tblp) != sz))
+ unmapped = __arm_v7s_unmap(data, iova + i * sz,
+ sz, lvl, tblp);
+ io_pgtable_tlb_sync(&data->iop);
+ if (WARN_ON(unmapped != sz))
return -EINVAL;
} else if (ptep[i]) {
/* We require an unmap first */
@@ -633,7 +637,6 @@ static int __arm_v7s_unmap(struct arm_v7s_io_pgtable *data,
/* Also flush any partial walks */
io_pgtable_tlb_add_flush(iop, iova, blk_size,
ARM_V7S_BLOCK_SIZE(lvl + 1), false);
- io_pgtable_tlb_sync(iop);
ptep = iopte_deref(pte[i], lvl);
__arm_v7s_free_table(ptep, lvl + 1, data);
} else {
@@ -660,16 +663,18 @@ static int arm_v7s_unmap(struct io_pgtable_ops *ops, unsigned long iova,
size_t size)
{
struct arm_v7s_io_pgtable *data = io_pgtable_ops_to_data(ops);
- size_t unmapped;
if (WARN_ON(upper_32_bits(iova)))
return 0;
- unmapped = __arm_v7s_unmap(data, iova, size, 1, data->pgd);
- if (unmapped)
- io_pgtable_tlb_sync(&data->iop);
+ return __arm_v7s_unmap(data, iova, size, 1, data->pgd);
+}
+
+static void arm_v7s_iotlb_sync(struct io_pgtable_ops *ops)
+{
+ struct arm_v7s_io_pgtable *data = io_pgtable_ops_to_data(ops);
- return unmapped;
+ io_pgtable_tlb_sync(&data->iop);
}
static phys_addr_t arm_v7s_iova_to_phys(struct io_pgtable_ops *ops,
@@ -734,6 +739,7 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
data->iop.ops = (struct io_pgtable_ops) {
.map = arm_v7s_map,
.unmap = arm_v7s_unmap,
+ .iotlb_sync = arm_v7s_iotlb_sync,
.iova_to_phys = arm_v7s_iova_to_phys,
};
@@ -832,7 +838,7 @@ static int __init arm_v7s_do_selftests(void)
.quirks = IO_PGTABLE_QUIRK_ARM_NS | IO_PGTABLE_QUIRK_NO_DMA,
.pgsize_bitmap = SZ_4K | SZ_64K | SZ_1M | SZ_16M,
};
- unsigned int iova, size, iova_start;
+ unsigned int iova, size, unmapped, iova_start;
unsigned int i, loopnr = 0;
selftest_running = true;
@@ -887,7 +893,9 @@ static int __init arm_v7s_do_selftests(void)
size = 1UL << __ffs(cfg.pgsize_bitmap);
while (i < loopnr) {
iova_start = i * SZ_16M;
- if (ops->unmap(ops, iova_start + size, size) != size)
+ unmapped = ops->unmap(ops, iova_start + size, size);
+ ops->iotlb_sync(ops);
+ if (unmapped != size)
return __FAIL(ops);
/* Remap of partial unmap */
@@ -906,7 +914,9 @@ static int __init arm_v7s_do_selftests(void)
while (i != BITS_PER_LONG) {
size = 1UL << i;
- if (ops->unmap(ops, iova, size) != size)
+ unmapped = ops->unmap(ops, iova, size);
+ ops->iotlb_sync(ops);
+ if (unmapped != size)
return __FAIL(ops);
if (ops->iova_to_phys(ops, iova + 42))
--
2.5.0
This patch is base on:
(add02cfdc9bc2 "iommu: Introduce Interface for IOMMU TLB Flushing")
Because iotlb_sync is moved out of ".unmap = arm_smmu_unmap", some interval
".unmap" calls should explicitly followed by a iotlb_sync operation.
Signed-off-by: Zhen Lei <[email protected]>
---
drivers/iommu/arm-smmu-v3.c | 10 ++++++++++
drivers/iommu/io-pgtable-arm.c | 30 ++++++++++++++++++++----------
drivers/iommu/io-pgtable.h | 1 +
3 files changed, 31 insertions(+), 10 deletions(-)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index ef42c4b..e92828e 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1772,6 +1772,15 @@ arm_smmu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size)
return ops->unmap(ops, iova, size);
}
+static void arm_smmu_iotlb_sync(struct iommu_domain *domain)
+{
+ struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ struct io_pgtable_ops *ops = smmu_domain->pgtbl_ops;
+
+ if (ops && ops->iotlb_sync)
+ ops->iotlb_sync(ops);
+}
+
static phys_addr_t
arm_smmu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
{
@@ -1991,6 +2000,7 @@ static struct iommu_ops arm_smmu_ops = {
.attach_dev = arm_smmu_attach_dev,
.map = arm_smmu_map,
.unmap = arm_smmu_unmap,
+ .iotlb_sync = arm_smmu_iotlb_sync,
.map_sg = default_iommu_map_sg,
.iova_to_phys = arm_smmu_iova_to_phys,
.add_device = arm_smmu_add_device,
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index e8018a3..805efc9 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -304,6 +304,8 @@ static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
WARN_ON(!selftest_running);
return -EEXIST;
} else if (iopte_type(pte, lvl) == ARM_LPAE_PTE_TYPE_TABLE) {
+ size_t unmapped;
+
/*
* We need to unmap and free the old table before
* overwriting it with a block entry.
@@ -312,7 +314,9 @@ static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
size_t sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
tblp = ptep - ARM_LPAE_LVL_IDX(iova, lvl, data);
- if (WARN_ON(__arm_lpae_unmap(data, iova, sz, lvl, tblp) != sz))
+ unmapped = __arm_lpae_unmap(data, iova, sz, lvl, tblp);
+ io_pgtable_tlb_sync(&data->iop);
+ if (WARN_ON(unmapped != sz))
return -EINVAL;
}
@@ -584,7 +588,6 @@ static int __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
/* Also flush any partial walks */
io_pgtable_tlb_add_flush(iop, iova, size,
ARM_LPAE_GRANULE(data), false);
- io_pgtable_tlb_sync(iop);
ptep = iopte_deref(pte, data);
__arm_lpae_free_pgtable(data, lvl + 1, ptep);
} else {
@@ -609,7 +612,6 @@ static int __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
static int arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
size_t size)
{
- size_t unmapped;
struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
arm_lpae_iopte *ptep = data->pgd;
int lvl = ARM_LPAE_START_LVL(data);
@@ -617,11 +619,14 @@ static int arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias)))
return 0;
- unmapped = __arm_lpae_unmap(data, iova, size, lvl, ptep);
- if (unmapped)
- io_pgtable_tlb_sync(&data->iop);
+ return __arm_lpae_unmap(data, iova, size, lvl, ptep);
+}
+
+static void arm_lpae_iotlb_sync(struct io_pgtable_ops *ops)
+{
+ struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
- return unmapped;
+ io_pgtable_tlb_sync(&data->iop);
}
static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
@@ -734,6 +739,7 @@ arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
data->iop.ops = (struct io_pgtable_ops) {
.map = arm_lpae_map,
.unmap = arm_lpae_unmap,
+ .iotlb_sync = arm_lpae_iotlb_sync,
.iova_to_phys = arm_lpae_iova_to_phys,
};
@@ -1030,7 +1036,7 @@ static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
int i, j;
unsigned long iova;
- size_t size;
+ size_t size, unmapped;
struct io_pgtable_ops *ops;
selftest_running = true;
@@ -1082,7 +1088,9 @@ static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
/* Partial unmap */
size = 1UL << __ffs(cfg->pgsize_bitmap);
- if (ops->unmap(ops, SZ_1G + size, size) != size)
+ unmapped = ops->unmap(ops, SZ_1G + size, size);
+ ops->iotlb_sync(ops);
+ if (unmapped != size)
return __FAIL(ops, i);
/* Remap of partial unmap */
@@ -1098,7 +1106,9 @@ static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
while (j != BITS_PER_LONG) {
size = 1UL << j;
- if (ops->unmap(ops, iova, size) != size)
+ unmapped = ops->unmap(ops, iova, size);
+ ops->iotlb_sync(ops);
+ if (unmapped != size)
return __FAIL(ops, i);
if (ops->iova_to_phys(ops, iova + 42))
diff --git a/drivers/iommu/io-pgtable.h b/drivers/iommu/io-pgtable.h
index a3e6670..3a72e08 100644
--- a/drivers/iommu/io-pgtable.h
+++ b/drivers/iommu/io-pgtable.h
@@ -120,6 +120,7 @@ struct io_pgtable_ops {
phys_addr_t paddr, size_t size, int prot);
int (*unmap)(struct io_pgtable_ops *ops, unsigned long iova,
size_t size);
+ void (*iotlb_sync)(struct io_pgtable_ops *ops);
phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops,
unsigned long iova);
};
--
2.5.0
Hi Leizhen,
On 9/12/2017 9:00 AM, Zhen Lei wrote:
> v1 -> v2:
> base on (add02cfdc9bc2 "iommu: Introduce Interface for IOMMU TLB Flushing")
>
> Zhen Lei (3):
> iommu/arm-smmu-v3: put off the execution of TLBI* to reduce lock
> confliction
> iommu/arm-smmu-v3: add support for unmap an iova range with only one
> tlb sync
I tested these (2) patches on QDF2400 hardware and saw performance
improvements in line with those I reported when testing the original
series. I don't have any hardware close at hand to test the 3rd patch
in the series so that will have to come from someone else.
Tested-by: Nate Watterson <[email protected]>
Thanks,
Nate
> iommu/arm-smmu: add support for unmap a memory range with only one tlb
> sync
>
> drivers/iommu/arm-smmu-v3.c | 52 ++++++++++++++++++++++++++++++++++----
> drivers/iommu/arm-smmu.c | 10 ++++++++
> drivers/iommu/io-pgtable-arm-v7s.c | 32 +++++++++++++++--------
> drivers/iommu/io-pgtable-arm.c | 30 ++++++++++++++--------
> drivers/iommu/io-pgtable.h | 1 +
> 5 files changed, 99 insertions(+), 26 deletions(-)
>
--
Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
On 2017/9/19 12:31, Nate Watterson wrote:
> Hi Leizhen,
>
> On 9/12/2017 9:00 AM, Zhen Lei wrote:
>> v1 -> v2:
>> base on (add02cfdc9bc2 "iommu: Introduce Interface for IOMMU TLB Flushing")
>>
>> Zhen Lei (3):
>> iommu/arm-smmu-v3: put off the execution of TLBI* to reduce lock
>> confliction
>> iommu/arm-smmu-v3: add support for unmap an iova range with only one
>> tlb sync
>
> I tested these (2) patches on QDF2400 hardware and saw performance
> improvements in line with those I reported when testing the original
> series. I don't have any hardware close at hand to test the 3rd patch
> in the series so that will have to come from someone else.
Thanks a lot.
>
> Tested-by: Nate Watterson <[email protected]>
>
> Thanks,
> Nate
>
>> iommu/arm-smmu: add support for unmap a memory range with only one tlb
>> sync
>>
>> drivers/iommu/arm-smmu-v3.c | 52 ++++++++++++++++++++++++++++++++++----
>> drivers/iommu/arm-smmu.c | 10 ++++++++
>> drivers/iommu/io-pgtable-arm-v7s.c | 32 +++++++++++++++--------
>> drivers/iommu/io-pgtable-arm.c | 30 ++++++++++++++--------
>> drivers/iommu/io-pgtable.h | 1 +
>> 5 files changed, 99 insertions(+), 26 deletions(-)
>>
>
--
Thanks!
BestRegards