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iommu/amd: Add per-domain flush-queue data structures 

Make the flush-queue per dma-ops domain and add code
allocate and free the flush-queues;

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2017-06-02 14:55:56 +02:00
parent 460c26d05b
commit d4241a2761
1 changed files with 69 additions and 0 deletions
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69
drivers/iommu/amd_iommu.c
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@ -136,6 +136,18 @@ static void update_domain(struct protection_domain *domain);
static int protection_domain_init(struct protection_domain *domain);
static void detach_device(struct device *dev);
#define FLUSH_QUEUE_SIZE 256
struct flush_queue_entry {
unsigned long iova_pfn;
unsigned long pages;
};
struct flush_queue {
struct flush_queue_entry *entries;
unsigned head, tail;
};
/*
* Data container for a dma_ops specific protection domain
*/
@ -145,6 +157,8 @@ struct dma_ops_domain {
/* IOVA RB-Tree */
struct iova_domain iovad;
struct flush_queue __percpu *flush_queue;
};
static struct iova_domain reserved_iova_ranges;
@ -1742,6 +1756,56 @@ static void free_gcr3_table(struct protection_domain *domain)
free_page((unsigned long)domain->gcr3_tbl);
}
static void dma_ops_domain_free_flush_queue(struct dma_ops_domain *dom)
{
int cpu;
for_each_possible_cpu(cpu) {
struct flush_queue *queue;
queue = per_cpu_ptr(dom->flush_queue, cpu);
kfree(queue->entries);
}
free_percpu(dom->flush_queue);
dom->flush_queue = NULL;
}
static int dma_ops_domain_alloc_flush_queue(struct dma_ops_domain *dom)
{
int cpu;
dom->flush_queue = alloc_percpu(struct flush_queue);
if (!dom->flush_queue)
return -ENOMEM;
/* First make sure everything is cleared */
for_each_possible_cpu(cpu) {
struct flush_queue *queue;
queue = per_cpu_ptr(dom->flush_queue, cpu);
queue->head = 0;
queue->tail = 0;
queue->entries = NULL;
}
/* Now start doing the allocation */
for_each_possible_cpu(cpu) {
struct flush_queue *queue;
queue = per_cpu_ptr(dom->flush_queue, cpu);
queue->entries = kzalloc(FLUSH_QUEUE_SIZE * sizeof(*queue->entries),
GFP_KERNEL);
if (!queue->entries) {
dma_ops_domain_free_flush_queue(dom);
return -ENOMEM;
}
}
return 0;
}
/*
* Free a domain, only used if something went wrong in the
* allocation path and we need to free an already allocated page table
@ -1753,6 +1817,8 @@ static void dma_ops_domain_free(struct dma_ops_domain *dom)
del_domain_from_list(&dom->domain);
dma_ops_domain_free_flush_queue(dom);
put_iova_domain(&dom->iovad);
free_pagetable(&dom->domain);
@ -1791,6 +1857,9 @@ static struct dma_ops_domain *dma_ops_domain_alloc(void)
/* Initialize reserved ranges */
copy_reserved_iova(&reserved_iova_ranges, &dma_dom->iovad);
if (dma_ops_domain_alloc_flush_queue(dma_dom))
goto free_dma_dom;
add_domain_to_list(&dma_dom->domain);
return dma_dom;