* [PATCH v3 6.1 0/4] ARM SMMUv3 errata for 6.1
@ 2023-08-02 17:20 Easwar Hariharan
2023-08-02 17:20 ` [PATCH v3 6.1 1/4] iommu/arm-smmu-v3: Work around MMU-600 erratum 1076982 Easwar Hariharan
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: Easwar Hariharan @ 2023-08-02 17:20 UTC (permalink / raw
To: stable
Cc: easwar.hariharan, Catalin Marinas, Will Deacon, Jonathan Corbet,
Robin Murphy, Joerg Roedel, linux-arm-kernel, linux-doc,
linux-kernel, iommu
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: iommu@lists.linux.dev
Changelog:
==========
v2 -> v3:
- v2 was generated from the wrong branch, resulting in slightly incorrect context for a hunk
- v2 link: https://lore.kernel.org/stable/20230802170911.1593275-1-eahariha@linux.microsoft.com/T/#t
v1 -> v2:
- Backport other relevant errata patches from the same series as MMU-700 erratum 2812531
- v1 link: https://lore.kernel.org/stable/20230724185107.1675882-1-eahariha@linux.microsoft.com/T/#u
Robin Murphy (4):
iommu/arm-smmu-v3: Work around MMU-600 erratum 1076982
iommu/arm-smmu-v3: Document MMU-700 erratum 2812531
iommu/arm-smmu-v3: Add explicit feature for nesting
iommu/arm-smmu-v3: Document nesting-related errata
Documentation/arm64/silicon-errata.rst | 4 ++
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 50 +++++++++++++++++++++
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 8 ++++
3 files changed, 62 insertions(+)
--
2.25.1
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v3 6.1 1/4] iommu/arm-smmu-v3: Work around MMU-600 erratum 1076982
2023-08-02 17:20 [PATCH v3 6.1 0/4] ARM SMMUv3 errata for 6.1 Easwar Hariharan
@ 2023-08-02 17:20 ` Easwar Hariharan
2023-08-02 17:20 ` [PATCH v3 6.1 2/4] iommu/arm-smmu-v3: Document MMU-700 erratum 2812531 Easwar Hariharan
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Easwar Hariharan @ 2023-08-02 17:20 UTC (permalink / raw
To: stable
Cc: easwar.hariharan, Robin Murphy, Nicolin Chen, Will Deacon,
Catalin Marinas, Jonathan Corbet, Joerg Roedel, Yicong Yang,
Vladimir Oltean, Lu Baolu,
moderated list:ARM64 PORT (AARCH64 ARCHITECTURE),
open list:DOCUMENTATION, open list, open list:IOMMU SUBSYSTEM
From: Robin Murphy <robin.murphy@arm.com>
commit f322e8af35c7f23a8c08b595c38d6c855b2d836f upstream
MMU-600 versions prior to r1p0 fail to correctly generate a WFE wakeup
event when the command queue transitions fom full to non-full. We can
easily work around this by simply hiding the SEV capability such that we
fall back to polling for space in the queue - since MMU-600 implements
MSIs we wouldn't expect to need SEV for sync completion either, so this
should have little to no impact.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/08adbe3d01024d8382a478325f73b56851f76e49.1683731256.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Easwar Hariharan <eahariha@linux.microsoft.com>
---
Documentation/arm64/silicon-errata.rst | 2 ++
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 29 +++++++++++++++++++++
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 6 +++++
3 files changed, 37 insertions(+)
diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst
index 55492fea4427..d7f664c5bd75 100644
--- a/Documentation/arm64/silicon-errata.rst
+++ b/Documentation/arm64/silicon-errata.rst
@@ -138,6 +138,8 @@ stable kernels.
+----------------+-----------------+-----------------+-----------------------------+
| ARM | MMU-500 | #841119,826419 | N/A |
+----------------+-----------------+-----------------+-----------------------------+
+| ARM | MMU-600 | #1076982 | N/A |
++----------------+-----------------+-----------------+-----------------------------+
+----------------+-----------------+-----------------+-----------------------------+
| Broadcom | Brahma-B53 | N/A | ARM64_ERRATUM_845719 |
+----------------+-----------------+-----------------+-----------------------------+
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index d4d8bfee9feb..c12b57910c51 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3410,6 +3410,33 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass)
return 0;
}
+#define IIDR_IMPLEMENTER_ARM 0x43b
+#define IIDR_PRODUCTID_ARM_MMU_600 0x483
+
+static void arm_smmu_device_iidr_probe(struct arm_smmu_device *smmu)
+{
+ u32 reg;
+ unsigned int implementer, productid, variant, revision;
+
+ reg = readl_relaxed(smmu->base + ARM_SMMU_IIDR);
+ implementer = FIELD_GET(IIDR_IMPLEMENTER, reg);
+ productid = FIELD_GET(IIDR_PRODUCTID, reg);
+ variant = FIELD_GET(IIDR_VARIANT, reg);
+ revision = FIELD_GET(IIDR_REVISION, reg);
+
+ switch (implementer) {
+ case IIDR_IMPLEMENTER_ARM:
+ switch (productid) {
+ case IIDR_PRODUCTID_ARM_MMU_600:
+ /* Arm erratum 1076982 */
+ if (variant == 0 && revision <= 2)
+ smmu->features &= ~ARM_SMMU_FEAT_SEV;
+ break;
+ }
+ break;
+ }
+}
+
static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu)
{
u32 reg;
@@ -3615,6 +3642,8 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu)
smmu->ias = max(smmu->ias, smmu->oas);
+ arm_smmu_device_iidr_probe(smmu);
+
if (arm_smmu_sva_supported(smmu))
smmu->features |= ARM_SMMU_FEAT_SVA;
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index cd48590ada30..ce5e44a13d84 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -69,6 +69,12 @@
#define IDR5_VAX GENMASK(11, 10)
#define IDR5_VAX_52_BIT 1
+#define ARM_SMMU_IIDR 0x18
+#define IIDR_PRODUCTID GENMASK(31, 20)
+#define IIDR_VARIANT GENMASK(19, 16)
+#define IIDR_REVISION GENMASK(15, 12)
+#define IIDR_IMPLEMENTER GENMASK(11, 0)
+
#define ARM_SMMU_CR0 0x20
#define CR0_ATSCHK (1 << 4)
#define CR0_CMDQEN (1 << 3)
--
2.25.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v3 6.1 2/4] iommu/arm-smmu-v3: Document MMU-700 erratum 2812531
2023-08-02 17:20 [PATCH v3 6.1 0/4] ARM SMMUv3 errata for 6.1 Easwar Hariharan
2023-08-02 17:20 ` [PATCH v3 6.1 1/4] iommu/arm-smmu-v3: Work around MMU-600 erratum 1076982 Easwar Hariharan
@ 2023-08-02 17:20 ` Easwar Hariharan
2023-08-02 17:20 ` [PATCH v3 6.1 3/4] iommu/arm-smmu-v3: Add explicit feature for nesting Easwar Hariharan
2023-08-02 17:21 ` [PATCH v3 6.1 4/4] iommu/arm-smmu-v3: Document nesting-related errata Easwar Hariharan
3 siblings, 0 replies; 5+ messages in thread
From: Easwar Hariharan @ 2023-08-02 17:20 UTC (permalink / raw
To: stable
Cc: easwar.hariharan, Robin Murphy, Nicolin Chen, Will Deacon,
Catalin Marinas, Jonathan Corbet, Joerg Roedel, Vladimir Oltean,
Lu Baolu, Yicong Yang,
moderated list:ARM64 PORT (AARCH64 ARCHITECTURE),
open list:DOCUMENTATION, open list, open list:IOMMU SUBSYSTEM
From: Robin Murphy <robin.murphy@arm.com>
commit 309a15cb16bb075da1c99d46fb457db6a1a2669e upstream
To work around MMU-700 erratum 2812531 we need to ensure that certain
sequences of commands cannot be issued without an intervening sync. In
practice this falls out of our current command-batching machinery
anyway - each batch only contains a single type of invalidation command,
and ends with a sync. The only exception is when a batch is sufficiently
large to need issuing across multiple command queue slots, wherein the
earlier slots will not contain a sync and thus may in theory interleave
with another batch being issued in parallel to create an affected
sequence across the slot boundary.
Since MMU-700 supports range invalidate commands and thus we will prefer
to use them (which also happens to avoid conditions for other errata),
I'm not entirely sure it's even possible for a single high-level
invalidate call to generate a batch of more than 63 commands, but for
the sake of robustness and documentation, wire up an option to enforce
that a sync is always inserted for every slot issued.
The other aspect is that the relative order of DVM commands cannot be
controlled, so DVM cannot be used. Again that is already the status quo,
but since we have at least defined ARM_SMMU_FEAT_BTM, we can explicitly
disable it for documentation purposes even if it's not wired up anywhere
yet.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/330221cdfd0003cd51b6c04e7ff3566741ad8374.1683731256.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Easwar Hariharan <eahariha@linux.microsoft.com>
---
Documentation/arm64/silicon-errata.rst | 2 ++
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 12 ++++++++++++
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 +
3 files changed, 15 insertions(+)
diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst
index d7f664c5bd75..120784507bc0 100644
--- a/Documentation/arm64/silicon-errata.rst
+++ b/Documentation/arm64/silicon-errata.rst
@@ -140,6 +140,8 @@ stable kernels.
+----------------+-----------------+-----------------+-----------------------------+
| ARM | MMU-600 | #1076982 | N/A |
+----------------+-----------------+-----------------+-----------------------------+
+| ARM | MMU-700 | #2812531 | N/A |
++----------------+-----------------+-----------------+-----------------------------+
+----------------+-----------------+-----------------+-----------------------------+
| Broadcom | Brahma-B53 | N/A | ARM64_ERRATUM_845719 |
+----------------+-----------------+-----------------+-----------------------------+
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index c12b57910c51..aed038f7d66c 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -882,6 +882,12 @@ static void arm_smmu_cmdq_batch_add(struct arm_smmu_device *smmu,
{
int index;
+ if (cmds->num == CMDQ_BATCH_ENTRIES - 1 &&
+ (smmu->options & ARM_SMMU_OPT_CMDQ_FORCE_SYNC)) {
+ arm_smmu_cmdq_issue_cmdlist(smmu, cmds->cmds, cmds->num, true);
+ cmds->num = 0;
+ }
+
if (cmds->num == CMDQ_BATCH_ENTRIES) {
arm_smmu_cmdq_issue_cmdlist(smmu, cmds->cmds, cmds->num, false);
cmds->num = 0;
@@ -3412,6 +3418,7 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass)
#define IIDR_IMPLEMENTER_ARM 0x43b
#define IIDR_PRODUCTID_ARM_MMU_600 0x483
+#define IIDR_PRODUCTID_ARM_MMU_700 0x487
static void arm_smmu_device_iidr_probe(struct arm_smmu_device *smmu)
{
@@ -3432,6 +3439,11 @@ static void arm_smmu_device_iidr_probe(struct arm_smmu_device *smmu)
if (variant == 0 && revision <= 2)
smmu->features &= ~ARM_SMMU_FEAT_SEV;
break;
+ case IIDR_PRODUCTID_ARM_MMU_700:
+ /* Arm erratum 2812531 */
+ smmu->features &= ~ARM_SMMU_FEAT_BTM;
+ smmu->options |= ARM_SMMU_OPT_CMDQ_FORCE_SYNC;
+ break;
}
break;
}
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index ce5e44a13d84..d9e4357c6869 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -650,6 +650,7 @@ struct arm_smmu_device {
#define ARM_SMMU_OPT_SKIP_PREFETCH (1 << 0)
#define ARM_SMMU_OPT_PAGE0_REGS_ONLY (1 << 1)
#define ARM_SMMU_OPT_MSIPOLL (1 << 2)
+#define ARM_SMMU_OPT_CMDQ_FORCE_SYNC (1 << 3)
u32 options;
struct arm_smmu_cmdq cmdq;
--
2.25.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v3 6.1 3/4] iommu/arm-smmu-v3: Add explicit feature for nesting
2023-08-02 17:20 [PATCH v3 6.1 0/4] ARM SMMUv3 errata for 6.1 Easwar Hariharan
2023-08-02 17:20 ` [PATCH v3 6.1 1/4] iommu/arm-smmu-v3: Work around MMU-600 erratum 1076982 Easwar Hariharan
2023-08-02 17:20 ` [PATCH v3 6.1 2/4] iommu/arm-smmu-v3: Document MMU-700 erratum 2812531 Easwar Hariharan
@ 2023-08-02 17:20 ` Easwar Hariharan
2023-08-02 17:21 ` [PATCH v3 6.1 4/4] iommu/arm-smmu-v3: Document nesting-related errata Easwar Hariharan
3 siblings, 0 replies; 5+ messages in thread
From: Easwar Hariharan @ 2023-08-02 17:20 UTC (permalink / raw
To: stable
Cc: easwar.hariharan, Robin Murphy, Nicolin Chen, Will Deacon,
Joerg Roedel, Vladimir Oltean, Yicong Yang, Lu Baolu,
moderated list:ARM SMMU DRIVERS, open list:IOMMU SUBSYSTEM,
open list
From: Robin Murphy <robin.murphy@arm.com>
commit 1d9777b9f3d55b4b6faf186ba4f1d6fb560c0523 upstream
In certain cases we may want to refuse to allow nested translation even
when both stages are implemented, so let's add an explicit feature for
nesting support which we can control in its own right. For now this
merely serves as documentation, but it means a nice convenient check
will be ready and waiting for the future nesting code.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/136c3f4a3a84cc14a5a1978ace57dfd3ed67b688.1683731256.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Easwar Hariharan <eahariha@linux.microsoft.com>
---
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 4 ++++
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 +
2 files changed, 5 insertions(+)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index aed038f7d66c..330f909a29de 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3654,6 +3654,10 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu)
smmu->ias = max(smmu->ias, smmu->oas);
+ if ((smmu->features & ARM_SMMU_FEAT_TRANS_S1) &&
+ (smmu->features & ARM_SMMU_FEAT_TRANS_S2))
+ smmu->features |= ARM_SMMU_FEAT_NESTING;
+
arm_smmu_device_iidr_probe(smmu);
if (arm_smmu_sva_supported(smmu))
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index d9e4357c6869..d0b207cae107 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -645,6 +645,7 @@ struct arm_smmu_device {
#define ARM_SMMU_FEAT_BTM (1 << 16)
#define ARM_SMMU_FEAT_SVA (1 << 17)
#define ARM_SMMU_FEAT_E2H (1 << 18)
+#define ARM_SMMU_FEAT_NESTING (1 << 19)
u32 features;
#define ARM_SMMU_OPT_SKIP_PREFETCH (1 << 0)
--
2.25.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v3 6.1 4/4] iommu/arm-smmu-v3: Document nesting-related errata
2023-08-02 17:20 [PATCH v3 6.1 0/4] ARM SMMUv3 errata for 6.1 Easwar Hariharan
` (2 preceding siblings ...)
2023-08-02 17:20 ` [PATCH v3 6.1 3/4] iommu/arm-smmu-v3: Add explicit feature for nesting Easwar Hariharan
@ 2023-08-02 17:21 ` Easwar Hariharan
3 siblings, 0 replies; 5+ messages in thread
From: Easwar Hariharan @ 2023-08-02 17:21 UTC (permalink / raw
To: stable
Cc: easwar.hariharan, Robin Murphy, Nicolin Chen, Will Deacon,
Catalin Marinas, Jonathan Corbet, Joerg Roedel, Vladimir Oltean,
Yicong Yang, Lu Baolu,
moderated list:ARM64 PORT (AARCH64 ARCHITECTURE),
open list:DOCUMENTATION, open list, open list:IOMMU SUBSYSTEM
From: Robin Murphy <robin.murphy@arm.com>
commit 0bfbfc526c70606bf0fad302e4821087cbecfaf4 upstream
Both MMU-600 and MMU-700 have similar errata around TLB invalidation
while both stages of translation are active, which will need some
consideration once nesting support is implemented. For now, though,
it's very easy to make our implicit lack of nesting support explicit
for those cases, so they're less likely to be missed in future.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/696da78d32bb4491f898f11b0bb4d850a8aa7c6a.1683731256.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Easwar Hariharan <eahariha@linux.microsoft.com>
---
Documentation/arm64/silicon-errata.rst | 4 ++--
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 5 +++++
2 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst
index 120784507bc0..a01ce64a0651 100644
--- a/Documentation/arm64/silicon-errata.rst
+++ b/Documentation/arm64/silicon-errata.rst
@@ -138,9 +138,9 @@ stable kernels.
+----------------+-----------------+-----------------+-----------------------------+
| ARM | MMU-500 | #841119,826419 | N/A |
+----------------+-----------------+-----------------+-----------------------------+
-| ARM | MMU-600 | #1076982 | N/A |
+| ARM | MMU-600 | #1076982,1209401| N/A |
+----------------+-----------------+-----------------+-----------------------------+
-| ARM | MMU-700 | #2812531 | N/A |
+| ARM | MMU-700 | #2268618,2812531| N/A |
+----------------+-----------------+-----------------+-----------------------------+
+----------------+-----------------+-----------------+-----------------------------+
| Broadcom | Brahma-B53 | N/A | ARM64_ERRATUM_845719 |
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 330f909a29de..db33dc87f69e 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3438,11 +3438,16 @@ static void arm_smmu_device_iidr_probe(struct arm_smmu_device *smmu)
/* Arm erratum 1076982 */
if (variant == 0 && revision <= 2)
smmu->features &= ~ARM_SMMU_FEAT_SEV;
+ /* Arm erratum 1209401 */
+ if (variant < 2)
+ smmu->features &= ~ARM_SMMU_FEAT_NESTING;
break;
case IIDR_PRODUCTID_ARM_MMU_700:
/* Arm erratum 2812531 */
smmu->features &= ~ARM_SMMU_FEAT_BTM;
smmu->options |= ARM_SMMU_OPT_CMDQ_FORCE_SYNC;
+ /* Arm errata 2268618, 2812531 */
+ smmu->features &= ~ARM_SMMU_FEAT_NESTING;
break;
}
break;
--
2.25.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
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