diff options
| author | Robin Murphy <robin.murphy@arm.com> | 2022-09-28 22:21:26 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2022-11-07 18:39:03 +0300 |
| commit | 05da178ce0aa152f0592e10fa874054187f3621b (patch) | |
| tree | 1d30cae11b15ba3e90dcca027a3d10fd56520d89 /drivers/acpi | |
| parent | 6251d38059ae22304ede4f3748af9f795bdbf4fd (diff) | |
| download | linux-05da178ce0aa152f0592e10fa874054187f3621b.tar.xz | |
ACPI/IORT: Update SMMUv3 DeviceID support
IORT E.e now allows SMMUv3 nodes to describe the DeviceID for MSIs
independently of wired GSIVs, where the previous oddly-restrictive
definition meant that an SMMU without PRI support had to provide a
DeviceID even if it didn't support MSIs either. Support this, with
the usual temporary flag definition while the real one is making
its way through ACPICA.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/4b3e2ead4f392d1a47a7528da119d57918e5d806.1664392886.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/arm64/iort.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 8059baf4ef27..38fb84974f35 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -402,6 +402,10 @@ static struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node, return NULL; } +#ifndef ACPI_IORT_SMMU_V3_DEVICEID_VALID +#define ACPI_IORT_SMMU_V3_DEVICEID_VALID (1 << 4) +#endif + static int iort_get_id_mapping_index(struct acpi_iort_node *node) { struct acpi_iort_smmu_v3 *smmu; @@ -418,12 +422,16 @@ static int iort_get_id_mapping_index(struct acpi_iort_node *node) smmu = (struct acpi_iort_smmu_v3 *)node->node_data; /* - * ID mapping index is only ignored if all interrupts are - * GSIV based + * Until IORT E.e (node rev. 5), the ID mapping index was + * defined to be valid unless all interrupts are GSIV-based. */ - if (smmu->event_gsiv && smmu->pri_gsiv && smmu->gerr_gsiv - && smmu->sync_gsiv) + if (node->revision < 5) { + if (smmu->event_gsiv && smmu->pri_gsiv && + smmu->gerr_gsiv && smmu->sync_gsiv) + return -EINVAL; + } else if (!(smmu->flags & ACPI_IORT_SMMU_V3_DEVICEID_VALID)) { return -EINVAL; + } if (smmu->id_mapping_index >= node->mapping_count) { pr_err(FW_BUG "[node %p type %d] ID mapping index overflows valid mappings\n", |