[PATCH 6.1 006/127] iommu/arm-smmu-v3: Document MMU-700 erratum 2812531

Greg Kroah-Hartman
2023-08-09T10:52:51Z

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
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(+)

--- a/Documentation/arm64/silicon-errata.rst
+++ b/Documentation/arm64/silicon-errata.rst
@@ -143,6 +143,8 @@ stable kernels.
+----------------+-----------------+-----------------+-----------------------------+
| ARM | MMU-600 | #1076982 | N/A |
+----------------+-----------------+-----------------+-----------------------------+
+| ARM | MMU-700 | #2812531 | N/A |
++----------------+-----------------+-----------------+-----------------------------+
+----------------+-----------------+-----------------+-----------------------------+
| Broadcom | Brahma-B53 | N/A | ARM64_ERRATUM_845719 |
+----------------+-----------------+-----------------+-----------------------------+
--- 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(stru
{
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

#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(s
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;
}
--- 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;