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authorZhen Lei <thunder.leizhen@huawei.com>2017-09-21 16:52:45 +0100
committerJoerg Roedel <jroedel@suse.de>2017-09-27 17:09:57 +0200
commitaa3ac9469c1850ed00741955b975c3a19029763a (patch)
tree998e22c451f149ef7c2cd5284d1539cc9b33496f /drivers/iommu
parente60aa7b53845a261dd419652f12ab9f89e668843 (diff)
iommu/iova: Make dma_32bit_pfn implicit
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>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/amd_iommu.c7
-rw-r--r--drivers/iommu/dma-iommu.c18
-rw-r--r--drivers/iommu/intel-iommu.c11
-rw-r--r--drivers/iommu/iova.c4
4 files changed, 8 insertions, 32 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 51f8215877f5..647ab7691aee 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -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);
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 9d1cebe7f6cb..191be9c80a8a 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -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;
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 6784a05dd6b2..ebb48353dd39 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -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 */
diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c
index c6f5a22f8d20..65032e60a5d1 100644
--- a/drivers/iommu/iova.c
+++ b/drivers/iommu/iova.c
@@ -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);