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author | Sam Protsenko <semen.protsenko@linaro.org> | 2022-07-26 23:07:39 +0300 |
---|---|---|
committer | Joerg Roedel <jroedel@suse.de> | 2023-01-25 12:04:50 +0100 |
commit | 2f599c3ff4e6f89dfd27fe2f4e1a4c040ba5f92f (patch) | |
tree | 5a2694f15a3aa199c354a192da7e0c28d829c283 /drivers/iommu | |
parent | c64074bfe2abbe18a57eb19c95f686298e8692b5 (diff) | |
download | linux-2f599c3ff4e6f89dfd27fe2f4e1a4c040ba5f92f.tar.gz linux-2f599c3ff4e6f89dfd27fe2f4e1a4c040ba5f92f.tar.bz2 linux-2f599c3ff4e6f89dfd27fe2f4e1a4c040ba5f92f.zip |
iommu/exynos: Implement fault handling on SysMMU v7
SysMMU v7 has a bit different registers for getting the fault info:
- there is one single register (MMU_FAULT_VA) to get the fault address
- fault access type (R/W) can be read from MMU_FAULT_TRANS_INFO
register now
- interrupt status register has different bits w.r.t. previous SysMMU
versions
- VM and non-VM layouts have different register addresses
Add correct fault handling implementation for SysMMU v7, according to
all mentioned differences. Only VID #0 (default) is handled, as VM
domains support is not implemented yet.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Link: https://lore.kernel.org/r/20220726200739.30017-3-semen.protsenko@linaro.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r-- | drivers/iommu/exynos-iommu.c | 48 |
1 files changed, 44 insertions, 4 deletions
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 75cade7382ab..69fd7fa3e49a 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -217,6 +217,13 @@ static const char * const sysmmu_v5_fault_names[] = { "SECURITY PROTECTION" }; +static const char * const sysmmu_v7_fault_names[] = { + "PTW", + "PAGE", + "ACCESS PROTECTION", + "RESERVED" +}; + /* * This structure is attached to dev->iommu->priv of the master device * on device add, contains a list of SYSMMU controllers defined by device tree, @@ -260,6 +267,8 @@ struct sysmmu_variant { u32 flush_end; /* end address of range invalidation */ u32 int_status; /* interrupt status information */ u32 int_clear; /* clear the interrupt */ + u32 fault_va; /* IOVA address that caused fault */ + u32 fault_info; /* fault transaction info */ int (*get_fault_info)(struct sysmmu_drvdata *data, unsigned int itype, struct sysmmu_fault *fault); @@ -337,6 +346,19 @@ static int exynos_sysmmu_v5_get_fault_info(struct sysmmu_drvdata *data, return 0; } +static int exynos_sysmmu_v7_get_fault_info(struct sysmmu_drvdata *data, + unsigned int itype, + struct sysmmu_fault *fault) +{ + u32 info = readl(SYSMMU_REG(data, fault_info)); + + fault->addr = readl(SYSMMU_REG(data, fault_va)); + fault->name = sysmmu_v7_fault_names[itype % 4]; + fault->type = (info & BIT(20)) ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ; + + return 0; +} + /* SysMMU v1..v3 */ static const struct sysmmu_variant sysmmu_v1_variant = { .flush_all = 0x0c, @@ -348,7 +370,7 @@ static const struct sysmmu_variant sysmmu_v1_variant = { .get_fault_info = exynos_sysmmu_v1_get_fault_info, }; -/* SysMMU v5 and v7 (non-VM capable) */ +/* SysMMU v5 */ static const struct sysmmu_variant sysmmu_v5_variant = { .pt_base = 0x0c, .flush_all = 0x10, @@ -362,7 +384,23 @@ static const struct sysmmu_variant sysmmu_v5_variant = { .get_fault_info = exynos_sysmmu_v5_get_fault_info, }; -/* SysMMU v7: VM capable register set */ +/* SysMMU v7: non-VM capable register layout */ +static const struct sysmmu_variant sysmmu_v7_variant = { + .pt_base = 0x0c, + .flush_all = 0x10, + .flush_entry = 0x14, + .flush_range = 0x18, + .flush_start = 0x20, + .flush_end = 0x24, + .int_status = 0x60, + .int_clear = 0x64, + .fault_va = 0x70, + .fault_info = 0x78, + + .get_fault_info = exynos_sysmmu_v7_get_fault_info, +}; + +/* SysMMU v7: VM capable register layout */ static const struct sysmmu_variant sysmmu_v7_vm_variant = { .pt_base = 0x800c, .flush_all = 0x8010, @@ -372,8 +410,10 @@ static const struct sysmmu_variant sysmmu_v7_vm_variant = { .flush_end = 0x8024, .int_status = 0x60, .int_clear = 0x64, + .fault_va = 0x1000, + .fault_info = 0x1004, - .get_fault_info = exynos_sysmmu_v5_get_fault_info, + .get_fault_info = exynos_sysmmu_v7_get_fault_info, }; static struct exynos_iommu_domain *to_exynos_domain(struct iommu_domain *dom) @@ -496,7 +536,7 @@ static void __sysmmu_get_version(struct sysmmu_drvdata *data) if (data->has_vcr) data->variant = &sysmmu_v7_vm_variant; else - data->variant = &sysmmu_v5_variant; + data->variant = &sysmmu_v7_variant; } __sysmmu_disable_clocks(data); |