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iommu/iova: Make dma_32bit_pfn implicit

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Now that the cached node optimisation can apply to all allocations, the
couple of users which were playing tricks with dma_32bit_pfn in order to
benefit from it can stop doing so. Conversely, there is also no need for
all the other users to explicitly calculate a 'real' 32-bit PFN, when
init_iova_domain() can happily do that itself from the page granularity.

CC: Thierry Reding <thierry.reding@gmail.com>
CC: Jonathan Hunter <jonathanh@nvidia.com>
CC: David Airlie <airlied@linux.ie>
CC: Sudeep Dutt <sudeep.dutt@intel.com>
CC: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Zhen Lei <thunder.leizhen@huawei.com>
Tested-by: Nate Watterson <nwatters@codeaurora.org>
[rm: use iova_shift(), rewrote commit message]
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Zhen Lei 2017-09-21 16:52:45 +01:00 committed by Joerg Roedel
parent e60aa7b538
commit aa3ac9469c
8 changed files with 13 additions and 41 deletions
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3
drivers/gpu/drm/tegra/drm.c
View File

@ -155,8 +155,7 @@ static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
order = __ffs(tegra->domain->pgsize_bitmap);
init_iova_domain(&tegra->carveout.domain, 1UL << order,
carveout_start >> order,
carveout_end >> order);
carveout_start >> order);
tegra->carveout.shift = iova_shift(&tegra->carveout.domain);
tegra->carveout.limit = carveout_end >> tegra->carveout.shift;

3
drivers/gpu/host1x/dev.c
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@ -198,8 +198,7 @@ static int host1x_probe(struct platform_device *pdev)
order = __ffs(host->domain->pgsize_bitmap);
init_iova_domain(&host->iova, 1UL << order,
geometry->aperture_start >> order,
geometry->aperture_end >> order);
geometry->aperture_start >> order);
host->iova_end = geometry->aperture_end;
}

7
drivers/iommu/amd_iommu.c
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@ -63,7 +63,6 @@
/* IO virtual address start page frame number */
#define IOVA_START_PFN (1)
#define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT)
#define DMA_32BIT_PFN IOVA_PFN(DMA_BIT_MASK(32))
/* Reserved IOVA ranges */
#define MSI_RANGE_START (0xfee00000)
@ -1788,8 +1787,7 @@ static struct dma_ops_domain *dma_ops_domain_alloc(void)
if (!dma_dom->domain.pt_root)
goto free_dma_dom;
init_iova_domain(&dma_dom->iovad, PAGE_SIZE,
IOVA_START_PFN, DMA_32BIT_PFN);
init_iova_domain(&dma_dom->iovad, PAGE_SIZE, IOVA_START_PFN);
if (init_iova_flush_queue(&dma_dom->iovad, iova_domain_flush_tlb, NULL))
goto free_dma_dom;
@ -2696,8 +2694,7 @@ static int init_reserved_iova_ranges(void)
struct pci_dev *pdev = NULL;
struct iova *val;
init_iova_domain(&reserved_iova_ranges, PAGE_SIZE,
IOVA_START_PFN, DMA_32BIT_PFN);
init_iova_domain(&reserved_iova_ranges, PAGE_SIZE, IOVA_START_PFN);
lockdep_set_class(&reserved_iova_ranges.iova_rbtree_lock,
&reserved_rbtree_key);

18
drivers/iommu/dma-iommu.c
View File

@ -292,18 +292,7 @@ int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
/* ...then finally give it a kicking to make sure it fits */
base_pfn = max_t(unsigned long, base_pfn,
domain->geometry.aperture_start >> order);
end_pfn = min_t(unsigned long, end_pfn,
domain->geometry.aperture_end >> order);
}
/*
* PCI devices may have larger DMA masks, but still prefer allocating
* within a 32-bit mask to avoid DAC addressing. Such limitations don't
* apply to the typical platform device, so for those we may as well
* leave the cache limit at the top of their range to save an rb_last()
* traversal on every allocation.
*/
if (dev && dev_is_pci(dev))
end_pfn &= DMA_BIT_MASK(32) >> order;
/* start_pfn is always nonzero for an already-initialised domain */
if (iovad->start_pfn) {
@ -312,16 +301,11 @@ int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
pr_warn("Incompatible range for DMA domain\n");
return -EFAULT;
}
/*
* If we have devices with different DMA masks, move the free
* area cache limit down for the benefit of the smaller one.
*/
iovad->dma_32bit_pfn = min(end_pfn + 1, iovad->dma_32bit_pfn);
return 0;
}
init_iova_domain(iovad, 1UL << order, base_pfn, end_pfn);
init_iova_domain(iovad, 1UL << order, base_pfn);
if (!dev)
return 0;

11
drivers/iommu/intel-iommu.c
View File

@ -82,8 +82,6 @@
#define IOVA_START_PFN (1)
#define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT)
#define DMA_32BIT_PFN IOVA_PFN(DMA_BIT_MASK(32))
#define DMA_64BIT_PFN IOVA_PFN(DMA_BIT_MASK(64))
/* page table handling */
#define LEVEL_STRIDE (9)
@ -1878,8 +1876,7 @@ static int dmar_init_reserved_ranges(void)
struct iova *iova;
int i;
init_iova_domain(&reserved_iova_list, VTD_PAGE_SIZE, IOVA_START_PFN,
DMA_32BIT_PFN);
init_iova_domain(&reserved_iova_list, VTD_PAGE_SIZE, IOVA_START_PFN);
lockdep_set_class(&reserved_iova_list.iova_rbtree_lock,
&reserved_rbtree_key);
@ -1938,8 +1935,7 @@ static int domain_init(struct dmar_domain *domain, struct intel_iommu *iommu,
unsigned long sagaw;
int err;
init_iova_domain(&domain->iovad, VTD_PAGE_SIZE, IOVA_START_PFN,
DMA_32BIT_PFN);
init_iova_domain(&domain->iovad, VTD_PAGE_SIZE, IOVA_START_PFN);
err = init_iova_flush_queue(&domain->iovad,
iommu_flush_iova, iova_entry_free);
@ -4897,8 +4893,7 @@ static int md_domain_init(struct dmar_domain *domain, int guest_width)
{
int adjust_width;
init_iova_domain(&domain->iovad, VTD_PAGE_SIZE, IOVA_START_PFN,
DMA_32BIT_PFN);
init_iova_domain(&domain->iovad, VTD_PAGE_SIZE, IOVA_START_PFN);
domain_reserve_special_ranges(domain);
/* calculate AGAW */

4
drivers/iommu/iova.c
View File

@ -37,7 +37,7 @@ static void fq_flush_timeout(unsigned long data);
void
init_iova_domain(struct iova_domain *iovad, unsigned long granule,
unsigned long start_pfn, unsigned long pfn_32bit)
unsigned long start_pfn)
{
/*
* IOVA granularity will normally be equal to the smallest
@ -52,7 +52,7 @@ init_iova_domain(struct iova_domain *iovad, unsigned long granule,
iovad->cached32_node = NULL;
iovad->granule = granule;
iovad->start_pfn = start_pfn;
iovad->dma_32bit_pfn = pfn_32bit + 1;
iovad->dma_32bit_pfn = 1UL << (32 - iova_shift(iovad));
iovad->flush_cb = NULL;
iovad->fq = NULL;
init_iova_rcaches(iovad);

3
drivers/misc/mic/scif/scif_rma.c
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@ -39,8 +39,7 @@ void scif_rma_ep_init(struct scif_endpt *ep)
struct scif_endpt_rma_info *rma = &ep->rma_info;
mutex_init(&rma->rma_lock);
init_iova_domain(&rma->iovad, PAGE_SIZE, SCIF_IOVA_START_PFN,
SCIF_DMA_64BIT_PFN);
init_iova_domain(&rma->iovad, PAGE_SIZE, SCIF_IOVA_START_PFN);
spin_lock_init(&rma->tc_lock);
mutex_init(&rma->mmn_lock);
INIT_LIST_HEAD(&rma->reg_list);

5
include/linux/iova.h
View File

@ -154,7 +154,7 @@ struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
unsigned long pfn_hi);
void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
void init_iova_domain(struct iova_domain *iovad, unsigned long granule,
unsigned long start_pfn, unsigned long pfn_32bit);
unsigned long start_pfn);
int init_iova_flush_queue(struct iova_domain *iovad,
iova_flush_cb flush_cb, iova_entry_dtor entry_dtor);
struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
@ -230,8 +230,7 @@ static inline void copy_reserved_iova(struct iova_domain *from,
static inline void init_iova_domain(struct iova_domain *iovad,
unsigned long granule,
unsigned long start_pfn,
unsigned long pfn_32bit)
unsigned long start_pfn)
{
}