* [PATCH v2 5.15 0/3] ARM64 errata for stable kernel 5.15
@ 2023-07-24 18:50 Easwar Hariharan
2023-07-24 18:50 ` [PATCH v2 5.15 1/3] arm64: errata: Add workaround for TSB flush failures Easwar Hariharan
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Easwar Hariharan @ 2023-07-24 18:50 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
This series works around a few ARM64 errata.
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:
==========
v1 -> v2:
- Drop patch accepted as commit
e4e7f67cc14e9638798f80513e84b8fb62cdb7e3 in v5.15.121
- Appropriate sign-offs
- v1 link:https://lore.kernel.org/stable/1689895414-17425-1-git-send-email-eahariha@linux.microsoft.com/
Robin Murphy (1):
iommu/arm-smmu-v3: Document MMU-700 erratum 2812531
Suzuki K Poulose (2):
arm64: errata: Add workaround for TSB flush failures
arm64: errata: Add detection for TRBE write to out-of-range
Documentation/arm64/silicon-errata.rst | 12 ++++
arch/arm64/Kconfig | 74 +++++++++++++++++++++
arch/arm64/include/asm/barrier.h | 16 ++++-
arch/arm64/kernel/cpu_errata.c | 39 +++++++++++
arch/arm64/tools/cpucaps | 2 +
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 41 ++++++++++++
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 +
7 files changed, 184 insertions(+), 1 deletion(-)
--
2.25.1
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH v2 5.15 1/3] arm64: errata: Add workaround for TSB flush failures
2023-07-24 18:50 [PATCH v2 5.15 0/3] ARM64 errata for stable kernel 5.15 Easwar Hariharan
@ 2023-07-24 18:50 ` Easwar Hariharan
2023-07-24 18:50 ` [PATCH v2 5.15 2/3] arm64: errata: Add detection for TRBE write to out-of-range Easwar Hariharan
2023-07-24 18:50 ` [PATCH v2 5.15 3/3] iommu/arm-smmu-v3: Document MMU-700 erratum 2812531 Easwar Hariharan
2 siblings, 0 replies; 4+ messages in thread
From: Easwar Hariharan @ 2023-07-24 18:50 UTC (permalink / raw)
To: stable
Cc: easwar.hariharan, Suzuki K Poulose, Will Deacon, Catalin Marinas,
Mathieu Poirier, Mike Leach, Mark Rutland, Anshuman Khandual,
Marc Zyngier, Jonathan Corbet, Greg Kroah-Hartman, James Morse,
Zenghui Yu, Ionela Voinescu,
moderated list:ARM64 PORT (AARCH64 ARCHITECTURE),
open list:DOCUMENTATION, open list
From: Suzuki K Poulose <suzuki.poulose@arm.com>
commit fa82d0b4b833790ac4572377fb777dcea24a9d69 upstream
Arm Neoverse-N2 (#2067961) and Cortex-A710 (#2054223) suffers
from errata, where a TSB (trace synchronization barrier)
fails to flush the trace data completely, when executed from
a trace prohibited region. In Linux we always execute it
after we have moved the PE to trace prohibited region. So,
we can apply the workaround every time a TSB is executed.
The work around is to issue two TSB consecutively.
NOTE: This errata is defined as LOCAL_CPU_ERRATUM, implying
that a late CPU could be blocked from booting if it is the
first CPU that requires the workaround. This is because we
do not allow setting a cpu_hwcaps after the SMP boot. The
other alternative is to use "this_cpu_has_cap()" instead
of the faster system wide check, which may be a bit of an
overhead, given we may have to do this in nvhe KVM host
before a guest entry.
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20211019163153.3692640-4-suzuki.poulose@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 ++++
arch/arm64/Kconfig | 33 ++++++++++++++++++++++++++
arch/arm64/include/asm/barrier.h | 16 ++++++++++++-
arch/arm64/kernel/cpu_errata.c | 19 +++++++++++++++
arch/arm64/tools/cpucaps | 1 +
5 files changed, 72 insertions(+), 1 deletion(-)
diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst
index 076861b0f5ac..1de575fc135b 100644
--- a/Documentation/arm64/silicon-errata.rst
+++ b/Documentation/arm64/silicon-errata.rst
@@ -104,6 +104,8 @@ stable kernels.
+----------------+-----------------+-----------------+-----------------------------+
| ARM | Cortex-A710 | #2119858 | ARM64_ERRATUM_2119858 |
+----------------+-----------------+-----------------+-----------------------------+
+| ARM | Cortex-A710 | #2054223 | ARM64_ERRATUM_2054223 |
++----------------+-----------------+-----------------+-----------------------------+
| ARM | Neoverse-N1 | #1188873,1418040| ARM64_ERRATUM_1418040 |
+----------------+-----------------+-----------------+-----------------------------+
| ARM | Neoverse-N1 | #1349291 | N/A |
@@ -112,6 +114,8 @@ stable kernels.
+----------------+-----------------+-----------------+-----------------------------+
| ARM | Neoverse-N2 | #2139208 | ARM64_ERRATUM_2139208 |
+----------------+-----------------+-----------------+-----------------------------+
+| ARM | Neoverse-N2 | #2067961 | ARM64_ERRATUM_2067961 |
++----------------+-----------------+-----------------+-----------------------------+
| ARM | MMU-500 | #841119,826419 | N/A |
+----------------+-----------------+-----------------+-----------------------------+
+----------------+-----------------+-----------------+-----------------------------+
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index e5e35470647b..6dce6e56ee53 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -774,6 +774,39 @@ config ARM64_ERRATUM_2139208
If unsure, say Y.
+config ARM64_WORKAROUND_TSB_FLUSH_FAILURE
+ bool
+
+config ARM64_ERRATUM_2054223
+ bool "Cortex-A710: 2054223: workaround TSB instruction failing to flush trace"
+ default y
+ select ARM64_WORKAROUND_TSB_FLUSH_FAILURE
+ help
+ Enable workaround for ARM Cortex-A710 erratum 2054223
+
+ Affected cores may fail to flush the trace data on a TSB instruction, when
+ the PE is in trace prohibited state. This will cause losing a few bytes
+ of the trace cached.
+
+ Workaround is to issue two TSB consecutively on affected cores.
+
+ If unsure, say Y.
+
+config ARM64_ERRATUM_2067961
+ bool "Neoverse-N2: 2067961: workaround TSB instruction failing to flush trace"
+ default y
+ select ARM64_WORKAROUND_TSB_FLUSH_FAILURE
+ help
+ Enable workaround for ARM Neoverse-N2 erratum 2067961
+
+ Affected cores may fail to flush the trace data on a TSB instruction, when
+ the PE is in trace prohibited state. This will cause losing a few bytes
+ of the trace cached.
+
+ Workaround is to issue two TSB consecutively on affected cores.
+
+ If unsure, say Y.
+
config CAVIUM_ERRATUM_22375
bool "Cavium erratum 22375, 24313"
default y
diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h
index 451e11e5fd23..1c5a00598458 100644
--- a/arch/arm64/include/asm/barrier.h
+++ b/arch/arm64/include/asm/barrier.h
@@ -23,7 +23,7 @@
#define dsb(opt) asm volatile("dsb " #opt : : : "memory")
#define psb_csync() asm volatile("hint #17" : : : "memory")
-#define tsb_csync() asm volatile("hint #18" : : : "memory")
+#define __tsb_csync() asm volatile("hint #18" : : : "memory")
#define csdb() asm volatile("hint #20" : : : "memory")
#ifdef CONFIG_ARM64_PSEUDO_NMI
@@ -46,6 +46,20 @@
#define dma_rmb() dmb(oshld)
#define dma_wmb() dmb(oshst)
+
+#define tsb_csync() \
+ do { \
+ /* \
+ * CPUs affected by Arm Erratum 2054223 or 2067961 needs \
+ * another TSB to ensure the trace is flushed. The barriers \
+ * don't have to be strictly back to back, as long as the \
+ * CPU is in trace prohibited state. \
+ */ \
+ if (cpus_have_final_cap(ARM64_WORKAROUND_TSB_FLUSH_FAILURE)) \
+ __tsb_csync(); \
+ __tsb_csync(); \
+ } while (0)
+
/*
* Generate a mask for array_index__nospec() that is ~0UL when 0 <= idx < sz
* and 0 otherwise.
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index d810d4b7b438..ab412b45732f 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -375,6 +375,18 @@ static const struct midr_range trbe_overwrite_fill_mode_cpus[] = {
};
#endif /* CONFIG_ARM64_WORKAROUND_TRBE_OVERWRITE_FILL_MODE */
+#ifdef CONFIG_ARM64_WORKAROUND_TSB_FLUSH_FAILURE
+static const struct midr_range tsb_flush_fail_cpus[] = {
+#ifdef CONFIG_ARM64_ERRATUM_2067961
+ MIDR_ALL_VERSIONS(MIDR_NEOVERSE_N2),
+#endif
+#ifdef CONFIG_ARM64_ERRATUM_2054223
+ MIDR_ALL_VERSIONS(MIDR_CORTEX_A710),
+#endif
+ {},
+};
+#endif /* CONFIG_ARM64_WORKAROUND_TSB_FLUSH_FAILURE */
+
const struct arm64_cpu_capabilities arm64_errata[] = {
#ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE
{
@@ -606,6 +618,13 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
.type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE,
CAP_MIDR_RANGE_LIST(trbe_overwrite_fill_mode_cpus),
},
+#endif
+#ifdef CONFIG_ARM64_WORKAROUND_TSB_FLUSH_FAILURE
+ {
+ .desc = "ARM erratum 2067961 or 2054223",
+ .capability = ARM64_WORKAROUND_TSB_FLUSH_FAILURE,
+ ERRATA_MIDR_RANGE_LIST(tsb_flush_fail_cpus),
+ },
#endif
{
}
diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
index 32fe50a3a26c..36ab307c69d4 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps
@@ -57,6 +57,7 @@ WORKAROUND_1542419
WORKAROUND_1742098
WORKAROUND_2457168
WORKAROUND_TRBE_OVERWRITE_FILL_MODE
+WORKAROUND_TSB_FLUSH_FAILURE
WORKAROUND_CAVIUM_23154
WORKAROUND_CAVIUM_27456
WORKAROUND_CAVIUM_30115
--
2.25.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH v2 5.15 2/3] arm64: errata: Add detection for TRBE write to out-of-range
2023-07-24 18:50 [PATCH v2 5.15 0/3] ARM64 errata for stable kernel 5.15 Easwar Hariharan
2023-07-24 18:50 ` [PATCH v2 5.15 1/3] arm64: errata: Add workaround for TSB flush failures Easwar Hariharan
@ 2023-07-24 18:50 ` Easwar Hariharan
2023-07-24 18:50 ` [PATCH v2 5.15 3/3] iommu/arm-smmu-v3: Document MMU-700 erratum 2812531 Easwar Hariharan
2 siblings, 0 replies; 4+ messages in thread
From: Easwar Hariharan @ 2023-07-24 18:50 UTC (permalink / raw)
To: stable
Cc: easwar.hariharan, Suzuki K Poulose, Anshuman Khandual,
Mathieu Poirier, Mike Leach, Leo Yan, Will Deacon, Mark Rutland,
Catalin Marinas, Jonathan Corbet, Greg Kroah-Hartman, James Morse,
Zenghui Yu, Ionela Voinescu,
moderated list:ARM64 PORT (AARCH64 ARCHITECTURE),
open list:DOCUMENTATION, open list
From: Suzuki K Poulose <suzuki.poulose@arm.com>
commit 8d81b2a38ddfc4b03662d2359765648c8b4cc73c upstream
Arm Neoverse-N2 and Cortex-A710 cores are affected by an erratum where
the trbe, under some circumstances, might write upto 64bytes to an
address after the Limit as programmed by the TRBLIMITR_EL1.LIMIT.
This might -
- Corrupt a page in the ring buffer, which may corrupt trace from a
previous session, consumed by userspace.
- Hit the guard page at the end of the vmalloc area and raise a fault.
To keep the handling simpler, we always leave the last page from the
range, which TRBE is allowed to write. This can be achieved by ensuring
that we always have more than a PAGE worth space in the range, while
calculating the LIMIT for TRBE. And then the LIMIT pointer can be
adjusted to leave the PAGE (TRBLIMITR.LIMIT -= PAGE_SIZE), out of the
TRBE range while enabling it. This makes sure that the TRBE will only
write to an area within its allowed limit (i.e, [head-head+size]) and
we do not have to handle address faults within the driver.
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20211019163153.3692640-5-suzuki.poulose@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 +++
arch/arm64/Kconfig | 41 ++++++++++++++++++++++++++
arch/arm64/kernel/cpu_errata.c | 20 +++++++++++++
arch/arm64/tools/cpucaps | 1 +
4 files changed, 66 insertions(+)
diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst
index 1de575fc135b..f64354f8a79f 100644
--- a/Documentation/arm64/silicon-errata.rst
+++ b/Documentation/arm64/silicon-errata.rst
@@ -106,6 +106,8 @@ stable kernels.
+----------------+-----------------+-----------------+-----------------------------+
| ARM | Cortex-A710 | #2054223 | ARM64_ERRATUM_2054223 |
+----------------+-----------------+-----------------+-----------------------------+
+| ARM | Cortex-A710 | #2224489 | ARM64_ERRATUM_2224489 |
++----------------+-----------------+-----------------+-----------------------------+
| ARM | Neoverse-N1 | #1188873,1418040| ARM64_ERRATUM_1418040 |
+----------------+-----------------+-----------------+-----------------------------+
| ARM | Neoverse-N1 | #1349291 | N/A |
@@ -116,6 +118,8 @@ stable kernels.
+----------------+-----------------+-----------------+-----------------------------+
| ARM | Neoverse-N2 | #2067961 | ARM64_ERRATUM_2067961 |
+----------------+-----------------+-----------------+-----------------------------+
+| ARM | Neoverse-N2 | #2253138 | ARM64_ERRATUM_2253138 |
++----------------+-----------------+-----------------+-----------------------------+
| ARM | MMU-500 | #841119,826419 | N/A |
+----------------+-----------------+-----------------+-----------------------------+
+----------------+-----------------+-----------------+-----------------------------+
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 6dce6e56ee53..5ab4b0520eab 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -807,6 +807,47 @@ config ARM64_ERRATUM_2067961
If unsure, say Y.
+config ARM64_WORKAROUND_TRBE_WRITE_OUT_OF_RANGE
+ bool
+
+config ARM64_ERRATUM_2253138
+ bool "Neoverse-N2: 2253138: workaround TRBE writing to address out-of-range"
+ depends on COMPILE_TEST # Until the CoreSight TRBE driver changes are in
+ depends on CORESIGHT_TRBE
+ default y
+ select ARM64_WORKAROUND_TRBE_WRITE_OUT_OF_RANGE
+ help
+ This option adds the workaround for ARM Neoverse-N2 erratum 2253138.
+
+ Affected Neoverse-N2 cores might write to an out-of-range address, not reserved
+ for TRBE. Under some conditions, the TRBE might generate a write to the next
+ virtually addressed page following the last page of the TRBE address space
+ (i.e., the TRBLIMITR_EL1.LIMIT), instead of wrapping around to the base.
+
+ Work around this in the driver by always making sure that there is a
+ page beyond the TRBLIMITR_EL1.LIMIT, within the space allowed for the TRBE.
+
+ If unsure, say Y.
+
+config ARM64_ERRATUM_2224489
+ bool "Cortex-A710: 2224489: workaround TRBE writing to address out-of-range"
+ depends on COMPILE_TEST # Until the CoreSight TRBE driver changes are in
+ depends on CORESIGHT_TRBE
+ default y
+ select ARM64_WORKAROUND_TRBE_WRITE_OUT_OF_RANGE
+ help
+ This option adds the workaround for ARM Cortex-A710 erratum 2224489.
+
+ Affected Cortex-A710 cores might write to an out-of-range address, not reserved
+ for TRBE. Under some conditions, the TRBE might generate a write to the next
+ virtually addressed page following the last page of the TRBE address space
+ (i.e., the TRBLIMITR_EL1.LIMIT), instead of wrapping around to the base.
+
+ Work around this in the driver by always making sure that there is a
+ page beyond the TRBLIMITR_EL1.LIMIT, within the space allowed for the TRBE.
+
+ If unsure, say Y.
+
config CAVIUM_ERRATUM_22375
bool "Cavium erratum 22375, 24313"
default y
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index ab412b45732f..bf69a20bc27f 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -387,6 +387,18 @@ static const struct midr_range tsb_flush_fail_cpus[] = {
};
#endif /* CONFIG_ARM64_WORKAROUND_TSB_FLUSH_FAILURE */
+#ifdef CONFIG_ARM64_WORKAROUND_TRBE_WRITE_OUT_OF_RANGE
+static struct midr_range trbe_write_out_of_range_cpus[] = {
+#ifdef CONFIG_ARM64_ERRATUM_2253138
+ MIDR_ALL_VERSIONS(MIDR_NEOVERSE_N2),
+#endif
+#ifdef CONFIG_ARM64_ERRATUM_2224489
+ MIDR_ALL_VERSIONS(MIDR_CORTEX_A710),
+#endif
+ {},
+};
+#endif /* CONFIG_ARM64_WORKAROUND_TRBE_WRITE_OUT_OF_RANGE */
+
const struct arm64_cpu_capabilities arm64_errata[] = {
#ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE
{
@@ -625,6 +637,14 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
.capability = ARM64_WORKAROUND_TSB_FLUSH_FAILURE,
ERRATA_MIDR_RANGE_LIST(tsb_flush_fail_cpus),
},
+#endif
+#ifdef CONFIG_ARM64_WORKAROUND_TRBE_WRITE_OUT_OF_RANGE
+ {
+ .desc = "ARM erratum 2253138 or 2224489",
+ .capability = ARM64_WORKAROUND_TRBE_WRITE_OUT_OF_RANGE,
+ .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE,
+ CAP_MIDR_RANGE_LIST(trbe_write_out_of_range_cpus),
+ },
#endif
{
}
diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
index 36ab307c69d4..fcaeec5a5125 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps
@@ -58,6 +58,7 @@ WORKAROUND_1742098
WORKAROUND_2457168
WORKAROUND_TRBE_OVERWRITE_FILL_MODE
WORKAROUND_TSB_FLUSH_FAILURE
+WORKAROUND_TRBE_WRITE_OUT_OF_RANGE
WORKAROUND_CAVIUM_23154
WORKAROUND_CAVIUM_27456
WORKAROUND_CAVIUM_30115
--
2.25.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH v2 5.15 3/3] iommu/arm-smmu-v3: Document MMU-700 erratum 2812531
2023-07-24 18:50 [PATCH v2 5.15 0/3] ARM64 errata for stable kernel 5.15 Easwar Hariharan
2023-07-24 18:50 ` [PATCH v2 5.15 1/3] arm64: errata: Add workaround for TSB flush failures Easwar Hariharan
2023-07-24 18:50 ` [PATCH v2 5.15 2/3] arm64: errata: Add detection for TRBE write to out-of-range Easwar Hariharan
@ 2023-07-24 18:50 ` Easwar Hariharan
2 siblings, 0 replies; 4+ messages in thread
From: Easwar Hariharan @ 2023-07-24 18:50 UTC (permalink / raw)
To: stable
Cc: easwar.hariharan, Robin Murphy, Nicolin Chen, Will Deacon,
Catalin Marinas, Jonathan Corbet, Joerg Roedel, Sasha Levin,
Mathieu Poirier, Yicong Yang, Tomas Krcka,
moderated list:ARM64 PORT (AARCH64 ARCHITECTURE),
open list:DOCUMENTATION, open list, open list:IOMMU DRIVERS,
open list:IOMMU DRIVERS
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 | 4 ++
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 41 +++++++++++++++++++++
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 +
3 files changed, 46 insertions(+)
diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst
index f64354f8a79f..322df8abbc0e 100644
--- a/Documentation/arm64/silicon-errata.rst
+++ b/Documentation/arm64/silicon-errata.rst
@@ -122,6 +122,10 @@ stable kernels.
+----------------+-----------------+-----------------+-----------------------------+
| ARM | MMU-500 | #841119,826419 | N/A |
+----------------+-----------------+-----------------+-----------------------------+
+| 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 bcdb2cbdda97..ba2e5149604c 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -897,6 +897,14 @@ static void arm_smmu_cmdq_batch_add(struct arm_smmu_device *smmu,
struct arm_smmu_cmdq_batch *cmds,
struct arm_smmu_cmdq_ent *cmd)
{
+ 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;
@@ -3459,6 +3467,39 @@ 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
+#define IIDR_PRODUCTID_ARM_MMU_700 0x487
+
+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;
+ 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;
+ }
+}
+
static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu)
{
u32 reg;
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 4cb136f07914..eeb780c5c1e0 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_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] 4+ messages in thread
end of thread, other threads:[~2023-07-24 18:50 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-07-24 18:50 [PATCH v2 5.15 0/3] ARM64 errata for stable kernel 5.15 Easwar Hariharan
2023-07-24 18:50 ` [PATCH v2 5.15 1/3] arm64: errata: Add workaround for TSB flush failures Easwar Hariharan
2023-07-24 18:50 ` [PATCH v2 5.15 2/3] arm64: errata: Add detection for TRBE write to out-of-range Easwar Hariharan
2023-07-24 18:50 ` [PATCH v2 5.15 3/3] iommu/arm-smmu-v3: Document MMU-700 erratum 2812531 Easwar Hariharan
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).