Copy the content of TCR, MAIR and TTBR of a given task into a context
descriptor.
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx>
---
drivers/iommu/arm-smmu-v3.c | 38 ++++++++++++++++++++++++++++++++++++--
1 file changed, 36 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index c86a1182c137..293f260782c2 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -43,6 +43,7 @@
#include <linux/amba/bus.h>
#include "io-pgtable.h"
+#include "io-pgtable-arm.h"
/* MMIO registers */
#define ARM_SMMU_IDR0 0x0
@@ -2170,13 +2171,46 @@ static int arm_smmu_process_init_pgtable(struct arm_smmu_process *smmu_process,
struct mm_struct *mm)
{
int asid;
+ unsigned long tcr;
+ unsigned long reg, par;
+ struct arm_smmu_ctx_desc *cfg = &smmu_process->ctx_desc;
asid = mm_context_get(mm);
if (!asid)
return -ENOSPC;
- smmu_process->ctx_desc.asid = asid;
- /* TODO: init the rest */
+ tcr = TCR_T0SZ(VA_BITS) | TCR_IRGN0_WBWA | TCR_ORGN0_WBWA |
+ TCR_SH0_INNER | ARM_LPAE_TCR_EPD1;
+
+ switch (PAGE_SIZE) {
+ case SZ_4K:
+ tcr |= TCR_TG0_4K;
+ break;
+ case SZ_16K:
+ tcr |= TCR_TG0_16K;
+ break;
+ case SZ_64K:
+ tcr |= TCR_TG0_64K;
+ break;
+ default:
+ WARN_ON(1);
+ return -EFAULT;
+ }
+
+ reg = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
+ par = cpuid_feature_extract_unsigned_field(reg, ID_AA64MMFR0_PARANGE_SHIFT);
+ tcr |= par << ARM_LPAE_TCR_IPS_SHIFT;
+
+ tcr |= TCR_TBI0;
+
+ cfg->asid = asid;
+ cfg->ttbr = virt_to_phys(mm->pgd);
+ /*
+ * MAIR value is pretty much constant and global, so we can just get it
+ * from the current CPU register
+ */
+ cfg->mair = read_sysreg(mair_el1);
+ cfg->tcr = tcr;
return 0;
}
--
2.13.3
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
