#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 {
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];
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);
* 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;
/*
* 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)
/* 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
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[] = {
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);
/*