iommu/amd: Remove need_flush from struct dma_ops_domain

The flushing of iommu tlbs is now done on a per-range basis.
So there is no need anymore for domain-wide flush tracking.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 6 insertions, 24 deletions

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index faf51a066e98..39a2048a6cd2 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -151,9 +151,6 @@ struct dma_ops_domain {
 
         /* address space relevant data */
         struct aperture_range *aperture[APERTURE_MAX_RANGES];
-
-        /* This will be set to true when TLB needs to be flushed */
-        bool need_flush;
 };
 
 /****************************************************************************
@@ -1563,7 +1560,7 @@ static unsigned long dma_ops_area_alloc(struct device *dev,
                                         unsigned long align_mask,
                                         u64 dma_mask)
 {
-        unsigned long next_bit, boundary_size, mask;
+        unsigned long boundary_size, mask;
         unsigned long address = -1;
         int start = dom->next_index;
         int i;
@@ -1581,8 +1578,6 @@ static unsigned long dma_ops_area_alloc(struct device *dev,
                 if (!range || range->offset >= dma_mask)
                         continue;
 
-                next_bit  = range->next_bit;
-
                 address = dma_ops_aperture_alloc(dom, range, pages,
                                                  dma_mask, boundary_size,
                                                  align_mask);
@@ -1591,9 +1586,6 @@ static unsigned long dma_ops_area_alloc(struct device *dev,
                         dom->next_index = i;
                         break;
                 }
-
-                if (next_bit > range->next_bit)
-                        dom->need_flush = true;
         }
 
         return address;
@@ -1609,7 +1601,6 @@ static unsigned long dma_ops_alloc_addresses(struct device *dev,
 
 #ifdef CONFIG_IOMMU_STRESS
         dom->next_index = 0;
-        dom->need_flush = true;
 #endif
 
         address = dma_ops_area_alloc(dev, dom, pages, align_mask, dma_mask);
@@ -1642,7 +1633,8 @@ static void dma_ops_free_addresses(struct dma_ops_domain *dom,
                 return;
 #endif
 
-        if (address + pages > range->next_bit) {
+        if (amd_iommu_unmap_flush ||
+            (address + pages > range->next_bit)) {
                 domain_flush_tlb(&dom->domain);
                 domain_flush_complete(&dom->domain);
         }
@@ -1868,8 +1860,6 @@ static struct dma_ops_domain *dma_ops_domain_alloc(void)
         if (!dma_dom->domain.pt_root)
                 goto free_dma_dom;
 
-        dma_dom->need_flush = false;
-
         add_domain_to_list(&dma_dom->domain);
 
         if (alloc_new_range(dma_dom, true, GFP_KERNEL))
@@ -2503,11 +2493,10 @@ retry:
 
         ADD_STATS_COUNTER(alloced_io_mem, size);
 
-        if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) {
-                domain_flush_tlb(&dma_dom->domain);
-                dma_dom->need_flush = false;
-        } else if (unlikely(amd_iommu_np_cache))
+        if (unlikely(amd_iommu_np_cache)) {
                 domain_flush_pages(&dma_dom->domain, address, size);
+                domain_flush_complete(&dma_dom->domain);
+        }
 
 out:
         return address;
@@ -2519,8 +2508,6 @@ out_unmap:
                 dma_ops_domain_unmap(dma_dom, start);
         }
 
-        domain_flush_pages(&dma_dom->domain, address, size);
-
         dma_ops_free_addresses(dma_dom, address, pages);
 
         return DMA_ERROR_CODE;
@@ -2553,11 +2540,6 @@ static void __unmap_single(struct dma_ops_domain *dma_dom,
                 start += PAGE_SIZE;
         }
 
-        if (amd_iommu_unmap_flush || dma_dom->need_flush) {
-                domain_flush_pages(&dma_dom->domain, flush_addr, size);
-                dma_dom->need_flush = false;
-        }
-
         SUB_STATS_COUNTER(alloced_io_mem, size);
 
         dma_ops_free_addresses(dma_dom, dma_addr, pages);