Commit c5b5da9c authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu/amd: Set up data structures for flush queue 



The flush queue is the equivalent to defered-flushing in the
Intel VT-d driver. This patch sets up the data structures
needed for this.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent bda350db

drivers/iommu/amd_iommu.c

+39 −1
Original line number Diff line number Diff line
@@ -89,6 +89,22 @@ LIST_HEAD(ioapic_map); 
LIST_HEAD(hpet_map);

LIST_HEAD(acpihid_map);



#define FLUSH_QUEUE_SIZE 256



struct flush_queue_entry {

	unsigned long iova_pfn;

	unsigned long pages;

	struct dma_ops_domain *dma_dom;

};



struct flush_queue {

	spinlock_t lock;

	unsigned next;

	struct flush_queue_entry *entries;

};



DEFINE_PER_CPU(struct flush_queue, flush_queue);



/*

 * Domain for untranslated devices - only allocated

 * if iommu=pt passed on kernel cmd line.
@@ -2508,7 +2524,7 @@ static int init_reserved_iova_ranges(void) 


int __init amd_iommu_init_api(void)

{

	int ret, err = 0;

	int ret, cpu, err = 0;



	ret = iova_cache_get();

	if (ret)
@@ -2518,6 +2534,18 @@ int __init amd_iommu_init_api(void) 
	if (ret)

		return ret;



	for_each_possible_cpu(cpu) {

		struct flush_queue *queue = per_cpu_ptr(&flush_queue, cpu);



		queue->entries = kzalloc(FLUSH_QUEUE_SIZE *

					 sizeof(*queue->entries),

					 GFP_KERNEL);

		if (!queue->entries)

			goto out_put_iova;



		spin_lock_init(&queue->lock);

	}



	err = bus_set_iommu(&pci_bus_type, &amd_iommu_ops);

	if (err)

		return err;
@@ -2530,6 +2558,15 @@ int __init amd_iommu_init_api(void) 
	if (err)

		return err;

	return 0;



out_put_iova:

	for_each_possible_cpu(cpu) {

		struct flush_queue *queue = per_cpu_ptr(&flush_queue, cpu);



		kfree(queue->entries);

	}



	return -ENOMEM;

}



int __init amd_iommu_init_dma_ops(void)
@@ -2552,6 +2589,7 @@ int __init amd_iommu_init_dma_ops(void) 
		pr_info("AMD-Vi: Lazy IO/TLB flushing enabled\n");



	return 0;



}



/*****************************************************************************