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Commit 5f6bed50 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu/amd: Make dma_ops_domain->next_index percpu 



Make this pointer percpu so that we start searching for new
addresses in the range we last stopped and which is has a
higher probability of being still in the cache.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 92d420ec

drivers/iommu/amd_iommu.c

+29 −10
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ 
#include <linux/msi.h>

#include <linux/dma-contiguous.h>

#include <linux/irqdomain.h>

#include <linux/percpu.h>

#include <asm/irq_remapping.h>

#include <asm/io_apic.h>

#include <asm/apic.h>
@@ -147,7 +148,7 @@ struct dma_ops_domain { 
	unsigned long aperture_size;



	/* aperture index we start searching for free addresses */

	unsigned long next_index;

	u32 __percpu *next_index;



	/* address space relevant data */

	struct aperture_range *aperture[APERTURE_MAX_RANGES];
@@ -1583,18 +1584,30 @@ static unsigned long dma_ops_area_alloc(struct device *dev, 
{

	unsigned long boundary_size, mask;

	unsigned long address = -1;

	int start = dom->next_index;

	int i;

	u32 start, i;



	preempt_disable();



	mask = dma_get_seg_boundary(dev);



	start = this_cpu_read(*dom->next_index);



	/* Sanity check - is it really necessary? */

	if (unlikely(start > APERTURE_MAX_RANGES)) {

		start = 0;

		this_cpu_write(*dom->next_index, 0);

	}



	boundary_size = mask + 1 ? ALIGN(mask + 1, PAGE_SIZE) >> PAGE_SHIFT :

				   1UL << (BITS_PER_LONG - PAGE_SHIFT);



	for (i = 0; i < APERTURE_MAX_RANGES; ++i) {

		struct aperture_range *range;

		int index;



		index = (start + i) % APERTURE_MAX_RANGES;



		range = dom->aperture[(start + i) % APERTURE_MAX_RANGES];

		range = dom->aperture[index];



		if (!range || range->offset >= dma_mask)

			continue;
@@ -1604,11 +1617,13 @@ static unsigned long dma_ops_area_alloc(struct device *dev, 
						 align_mask);

		if (address != -1) {

			address = range->offset + (address << PAGE_SHIFT);

			dom->next_index = i;

			this_cpu_write(*dom->next_index, index);

			break;

		}

	}



	preempt_enable();



	return address;

}
@@ -1620,10 +1635,6 @@ static unsigned long dma_ops_alloc_addresses(struct device *dev, 
{

	unsigned long address = -1;



#ifdef CONFIG_IOMMU_STRESS

	dom->next_index = 0;

#endif



	while (address == -1) {

		address = dma_ops_area_alloc(dev, dom, pages,

					     align_mask, dma_mask);
@@ -1851,6 +1862,8 @@ static void dma_ops_domain_free(struct dma_ops_domain *dom) 
	if (!dom)

		return;



	free_percpu(dom->next_index);



	del_domain_from_list(&dom->domain);



	free_pagetable(&dom->domain);
@@ -1873,6 +1886,7 @@ static void dma_ops_domain_free(struct dma_ops_domain *dom) 
static struct dma_ops_domain *dma_ops_domain_alloc(void)

{

	struct dma_ops_domain *dma_dom;

	int cpu;



	dma_dom = kzalloc(sizeof(struct dma_ops_domain), GFP_KERNEL);

	if (!dma_dom)
@@ -1881,6 +1895,10 @@ static struct dma_ops_domain *dma_ops_domain_alloc(void) 
	if (protection_domain_init(&dma_dom->domain))

		goto free_dma_dom;



	dma_dom->next_index = alloc_percpu(u32);

	if (!dma_dom->next_index)

		goto free_dma_dom;



	dma_dom->domain.mode = PAGE_MODE_2_LEVEL;

	dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL);

	dma_dom->domain.flags = PD_DMA_OPS_MASK;
@@ -1898,8 +1916,9 @@ static struct dma_ops_domain *dma_ops_domain_alloc(void) 
	 * a valid dma-address. So we can use 0 as error value

	 */

	dma_dom->aperture[0]->bitmap[0] = 1;

	dma_dom->next_index = 0;



	for_each_possible_cpu(cpu)

		*per_cpu_ptr(dma_dom->next_index, cpu) = 0;



	return dma_dom;