diff options
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/ipmmu-vmsa.c | 30 |
1 files changed, 22 insertions, 8 deletions
diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c index 5db853b92d3b..c70efd80f740 100644 --- a/drivers/iommu/ipmmu-vmsa.c +++ b/drivers/iommu/ipmmu-vmsa.c @@ -37,11 +37,12 @@ #include "io-pgtable.h" -#define IPMMU_CTX_MAX 1 +#define IPMMU_CTX_MAX 8 struct ipmmu_features { bool use_ns_alias_offset; bool has_cache_leaf_nodes; + unsigned int number_of_contexts; }; struct ipmmu_vmsa_device { @@ -51,6 +52,7 @@ struct ipmmu_vmsa_device { struct ipmmu_vmsa_device *root; const struct ipmmu_features *features; unsigned int num_utlbs; + unsigned int num_ctx; spinlock_t lock; /* Protects ctx and domains[] */ DECLARE_BITMAP(ctx, IPMMU_CTX_MAX); struct ipmmu_vmsa_domain *domains[IPMMU_CTX_MAX]; @@ -352,11 +354,12 @@ static int ipmmu_domain_allocate_context(struct ipmmu_vmsa_device *mmu, spin_lock_irqsave(&mmu->lock, flags); - ret = find_first_zero_bit(mmu->ctx, IPMMU_CTX_MAX); - if (ret != IPMMU_CTX_MAX) { + ret = find_first_zero_bit(mmu->ctx, mmu->num_ctx); + if (ret != mmu->num_ctx) { mmu->domains[ret] = domain; set_bit(ret, mmu->ctx); - } + } else + ret = -EBUSY; spin_unlock_irqrestore(&mmu->lock, flags); @@ -409,8 +412,8 @@ static int ipmmu_domain_init_context(struct ipmmu_vmsa_domain *domain) * Find an unused context. */ ret = ipmmu_domain_allocate_context(domain->mmu->root, domain); - if (ret == IPMMU_CTX_MAX) - return -EBUSY; + if (ret < 0) + return ret; domain->context_id = ret; @@ -539,7 +542,7 @@ static irqreturn_t ipmmu_irq(int irq, void *dev) /* * Check interrupts for all active contexts. */ - for (i = 0; i < IPMMU_CTX_MAX; i++) { + for (i = 0; i < mmu->num_ctx; i++) { if (!mmu->domains[i]) continue; if (ipmmu_domain_irq(mmu->domains[i]) == IRQ_HANDLED) @@ -624,6 +627,13 @@ static int ipmmu_attach_device(struct iommu_domain *io_domain, /* The domain hasn't been used yet, initialize it. */ domain->mmu = mmu; ret = ipmmu_domain_init_context(domain); + if (ret < 0) { + dev_err(dev, "Unable to initialize IPMMU context\n"); + domain->mmu = NULL; + } else { + dev_info(dev, "Using IPMMU context %u\n", + domain->context_id); + } } else if (domain->mmu != mmu) { /* * Something is wrong, we can't attach two devices using @@ -853,13 +863,14 @@ static void ipmmu_device_reset(struct ipmmu_vmsa_device *mmu) unsigned int i; /* Disable all contexts. */ - for (i = 0; i < 4; ++i) + for (i = 0; i < mmu->num_ctx; ++i) ipmmu_write(mmu, i * IM_CTX_SIZE + IMCTR, 0); } static const struct ipmmu_features ipmmu_features_default = { .use_ns_alias_offset = true, .has_cache_leaf_nodes = false, + .number_of_contexts = 1, /* software only tested with one context */ }; static const struct of_device_id ipmmu_of_ids[] = { @@ -913,6 +924,9 @@ static int ipmmu_probe(struct platform_device *pdev) if (mmu->features->use_ns_alias_offset) mmu->base += IM_NS_ALIAS_OFFSET; + mmu->num_ctx = min_t(unsigned int, IPMMU_CTX_MAX, + mmu->features->number_of_contexts); + irq = platform_get_irq(pdev, 0); /* |