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iommu/arm-smmu: Simplify VMID and ASID allocation

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We only use ASIDs and VMIDs to identify individual stage-1 and stage-2
context-banks respectively, so rather than allocate these separately
from the context-banks, just calculate them based on the context bank
index.

Note that VMIDs are offset by 1, since VMID 0 is reserved for stage-1.
This doesn't cause us any issues with the numberspaces, since the
maximum number of context banks is half the minimum number of VMIDs.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
This commit is contained in:
Will Deacon 2013-07-31 19:21:28 +01:00 committed by Joerg Roedel
parent 1463fe44fd
commit ecfadb6e5b
1 changed files with 11 additions and 22 deletions
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33
drivers/iommu/arm-smmu.c
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@ -56,9 +56,6 @@
/* Maximum number of mapping groups per SMMU */
#define ARM_SMMU_MAX_SMRS 128
/* Number of VMIDs per SMMU */
#define ARM_SMMU_NUM_VMIDS 256
/* SMMU global address space */
#define ARM_SMMU_GR0(smmu) ((smmu)->base)
#define ARM_SMMU_GR1(smmu) ((smmu)->base + (smmu)->pagesize)
@ -369,21 +366,21 @@ struct arm_smmu_device {
u32 num_context_irqs;
unsigned int *irqs;
DECLARE_BITMAP(vmid_map, ARM_SMMU_NUM_VMIDS);
struct list_head list;
struct rb_root masters;
};
struct arm_smmu_cfg {
struct arm_smmu_device *smmu;
u8 vmid;
u8 cbndx;
u8 irptndx;
u32 cbar;
pgd_t *pgd;
};
#define ARM_SMMU_CB_ASID(cfg) ((cfg)->cbndx)
#define ARM_SMMU_CB_VMID(cfg) ((cfg)->cbndx + 1)
struct arm_smmu_domain {
/*
* A domain can span across multiple, chained SMMUs and requires
@ -545,10 +542,12 @@ static void arm_smmu_tlb_inv_context(struct arm_smmu_cfg *cfg)
if (stage1) {
base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, cfg->cbndx);
writel_relaxed(cfg->vmid, base + ARM_SMMU_CB_S1_TLBIASID);
writel_relaxed(ARM_SMMU_CB_ASID(cfg),
base + ARM_SMMU_CB_S1_TLBIASID);
} else {
base = ARM_SMMU_GR0(smmu);
writel_relaxed(cfg->vmid, base + ARM_SMMU_GR0_TLBIVMID);
writel_relaxed(ARM_SMMU_CB_VMID(cfg),
base + ARM_SMMU_GR0_TLBIVMID);
}
arm_smmu_tlb_sync(smmu);
@ -650,7 +649,7 @@ static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain)
if (stage1)
reg |= (CBAR_S1_MEMATTR_WB << CBAR_S1_MEMATTR_SHIFT);
else
reg |= root_cfg->vmid << CBAR_VMID_SHIFT;
reg |= ARM_SMMU_CB_VMID(root_cfg) << CBAR_VMID_SHIFT;
writel_relaxed(reg, gr1_base + ARM_SMMU_GR1_CBAR(root_cfg->cbndx));
if (smmu->version > 1) {
@ -715,7 +714,7 @@ static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain)
writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0_LO);
reg = (phys_addr_t)__pa(root_cfg->pgd) >> 32;
if (stage1)
reg |= root_cfg->vmid << TTBRn_HI_ASID_SHIFT;
reg |= ARM_SMMU_CB_ASID(root_cfg) << TTBRn_HI_ASID_SHIFT;
writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0_HI);
/*
@ -807,12 +806,6 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
return -ENODEV;
}
/* VMID zero is reserved for stage-1 mappings */
ret = __arm_smmu_alloc_bitmap(smmu->vmid_map, 1, ARM_SMMU_NUM_VMIDS);
if (IS_ERR_VALUE(ret))
return ret;
root_cfg->vmid = ret;
if (smmu->features & ARM_SMMU_FEAT_TRANS_NESTED) {
/*
* We will likely want to change this if/when KVM gets
@ -831,10 +824,9 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
ret = __arm_smmu_alloc_bitmap(smmu->context_map, start,
smmu->num_context_banks);
if (IS_ERR_VALUE(ret))
goto out_free_vmid;
return ret;
root_cfg->cbndx = ret;
if (smmu->version == 1) {
root_cfg->irptndx = atomic_inc_return(&smmu->irptndx);
root_cfg->irptndx %= smmu->num_context_irqs;
@ -858,8 +850,6 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
out_free_context:
__arm_smmu_free_bitmap(smmu->context_map, root_cfg->cbndx);
out_free_vmid:
__arm_smmu_free_bitmap(smmu->vmid_map, root_cfg->vmid);
return ret;
}
@ -884,7 +874,6 @@ static void arm_smmu_destroy_domain_context(struct iommu_domain *domain)
free_irq(irq, domain);
}
__arm_smmu_free_bitmap(smmu->vmid_map, root_cfg->vmid);
__arm_smmu_free_bitmap(smmu->context_map, root_cfg->cbndx);
}
@ -1936,7 +1925,7 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
of_node_put(master->of_node);
}
if (!bitmap_empty(smmu->vmid_map, ARM_SMMU_NUM_VMIDS))
if (!bitmap_empty(smmu->context_map, ARM_SMMU_MAX_CBS))
dev_err(dev, "removing device with active domains!\n");
for (i = 0; i < smmu->num_global_irqs; ++i)