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Commit 256e4621 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu/amd: Make use of the generic IOVA allocator 



Remove the old address allocation code and make use of the
generic IOVA allocator that is also used by other dma-ops
implementations.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 518d9b45

drivers/iommu/amd_iommu.c

+26 −157
Original line number Diff line number Diff line
@@ -1649,167 +1649,32 @@ static int alloc_new_range(struct dma_ops_domain *dma_dom, 
	return -ENOMEM;

}



static dma_addr_t dma_ops_aperture_alloc(struct dma_ops_domain *dom,

					 struct aperture_range *range,

					 unsigned long pages,

					 unsigned long dma_mask,

					 unsigned long boundary_size,

					 unsigned long align_mask,

					 bool trylock)

{

	unsigned long offset, limit, flags;

	dma_addr_t address;

	bool flush = false;



	offset = range->offset >> PAGE_SHIFT;

	limit  = iommu_device_max_index(APERTURE_RANGE_PAGES, offset,

					dma_mask >> PAGE_SHIFT);



	if (trylock) {

		if (!spin_trylock_irqsave(&range->bitmap_lock, flags))

			return -1;

	} else {

		spin_lock_irqsave(&range->bitmap_lock, flags);

	}



	address = iommu_area_alloc(range->bitmap, limit, range->next_bit,

				   pages, offset, boundary_size, align_mask);

	if (address == -1) {

		/* Nothing found, retry one time */

		address = iommu_area_alloc(range->bitmap, limit,

					   0, pages, offset, boundary_size,

					   align_mask);

		flush = true;

	}



	if (address != -1)

		range->next_bit = address + pages;



	spin_unlock_irqrestore(&range->bitmap_lock, flags);



	if (flush) {

		domain_flush_tlb(&dom->domain);

		domain_flush_complete(&dom->domain);

	}



	return address;

}



static unsigned long dma_ops_area_alloc(struct device *dev,

					struct dma_ops_domain *dom,

					unsigned int pages,

					unsigned long align_mask,

					u64 dma_mask)

{

	unsigned long boundary_size, mask;

	unsigned long address = -1;

	bool first = true;

	u32 start, i;



	preempt_disable();



	mask = dma_get_seg_boundary(dev);



again:

	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[index];



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

			continue;



		address = dma_ops_aperture_alloc(dom, range, pages,

						 dma_mask, boundary_size,

						 align_mask, first);

		if (address != -1) {

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

			this_cpu_write(*dom->next_index, index);

			break;

		}

	}



	if (address == -1 && first) {

		first = false;

		goto again;

	}



	preempt_enable();



	return address;

}



static unsigned long dma_ops_alloc_addresses(struct device *dev,

					     struct dma_ops_domain *dom,

					     unsigned int pages,

					     unsigned long align_mask,

					     u64 dma_mask)

static unsigned long dma_ops_alloc_iova(struct device *dev,

					struct dma_ops_domain *dma_dom,

					unsigned int pages, u64 dma_mask)

{

	unsigned long address = -1;

	unsigned long pfn = 0;



	while (address == -1) {

		address = dma_ops_area_alloc(dev, dom, pages,

					     align_mask, dma_mask);

	pages = __roundup_pow_of_two(pages);



		if (address == -1 && alloc_new_range(dom, false, GFP_ATOMIC))

			break;

	}

	if (dma_mask > DMA_BIT_MASK(32))

		pfn = alloc_iova_fast(&dma_dom->iovad, pages,

				      IOVA_PFN(DMA_BIT_MASK(32)));



	if (unlikely(address == -1))

		address = DMA_ERROR_CODE;

	if (!pfn)

		pfn = alloc_iova_fast(&dma_dom->iovad, pages, IOVA_PFN(dma_mask));



	WARN_ON((address + (PAGE_SIZE*pages)) > dom->aperture_size);



	return address;

	return (pfn << PAGE_SHIFT);

}



/*

 * The address free function.

 *

 * called with domain->lock held

 */

static void dma_ops_free_addresses(struct dma_ops_domain *dom,

static void dma_ops_free_iova(struct dma_ops_domain *dma_dom,

			      unsigned long address,

			      unsigned int pages)

{

	unsigned i = address >> APERTURE_RANGE_SHIFT;

	struct aperture_range *range = dom->aperture[i];

	unsigned long flags;



	BUG_ON(i >= APERTURE_MAX_RANGES || range == NULL);



#ifdef CONFIG_IOMMU_STRESS

	if (i < 4)

		return;

#endif



	if (amd_iommu_unmap_flush) {

		domain_flush_tlb(&dom->domain);

		domain_flush_complete(&dom->domain);

	}



	address = (address % APERTURE_RANGE_SIZE) >> PAGE_SHIFT;



	spin_lock_irqsave(&range->bitmap_lock, flags);

	if (address + pages > range->next_bit)

		range->next_bit = address + pages;

	bitmap_clear(range->bitmap, address, pages);

	spin_unlock_irqrestore(&range->bitmap_lock, flags);

	pages = __roundup_pow_of_two(pages);

	address >>= PAGE_SHIFT;



	free_iova_fast(&dma_dom->iovad, address, pages);

}



/****************************************************************************
@@ -2586,9 +2451,7 @@ static dma_addr_t __map_single(struct device *dev, 
	if (align)

		align_mask = (1UL << get_order(size)) - 1;



	address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask,

					  dma_mask);



	address = dma_ops_alloc_iova(dev, dma_dom, pages, dma_mask);

	if (address == DMA_ERROR_CODE)

		goto out;
@@ -2626,7 +2489,10 @@ static dma_addr_t __map_single(struct device *dev, 
		iommu_unmap_page(&dma_dom->domain, start, PAGE_SIZE);

	}



	dma_ops_free_addresses(dma_dom, address, pages);

	domain_flush_tlb(&dma_dom->domain);

	domain_flush_complete(&dma_dom->domain);



	dma_ops_free_iova(dma_dom, address, pages);



	return DMA_ERROR_CODE;

}
@@ -2658,7 +2524,10 @@ static void __unmap_single(struct dma_ops_domain *dma_dom, 
		start += PAGE_SIZE;

	}



	dma_ops_free_addresses(dma_dom, dma_addr, pages);

	domain_flush_tlb(&dma_dom->domain);

	domain_flush_complete(&dma_dom->domain);



	dma_ops_free_iova(dma_dom, dma_addr, pages);

}



/*