Merge tag 'dma-mapping-5.19-2022-06-06' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fixes from Christoph Hellwig:

 - fix a regressin in setting swiotlb ->force_bounce (me)

 - make dma-debug less chatty (Rob Clark)

* tag 'dma-mapping-5.19-2022-06-06' of git://git.infradead.org/users/hch/dma-mapping:
  swiotlb: fix setting ->force_bounce
  dma-debug: make things less spammy under memory pressure

2 files changed, 7 insertions, 9 deletions

diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index ac740630c79c..2caafd13f8aa 100644
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -564,7 +564,7 @@ static void add_dma_entry(struct dma_debug_entry *entry, unsigned long attrs)
 
 	rc = active_cacheline_insert(entry);
 	if (rc == -ENOMEM) {
-		pr_err("cacheline tracking ENOMEM, dma-debug disabled\n");
+		pr_err_once("cacheline tracking ENOMEM, dma-debug disabled\n");
 		global_disable = true;
 	} else if (rc == -EEXIST && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) {
 		err_printk(entry->dev, entry,
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index dfa1de89dc94..cb50f8d38360 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -192,7 +192,7 @@ void __init swiotlb_update_mem_attributes(void)
 }
 
 static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
-				    unsigned long nslabs, bool late_alloc)
+		unsigned long nslabs, unsigned int flags, bool late_alloc)
 {
 	void *vaddr = phys_to_virt(start);
 	unsigned long bytes = nslabs << IO_TLB_SHIFT, i;
@@ -203,8 +203,7 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
 	mem->index = 0;
 	mem->late_alloc = late_alloc;
 
-	if (swiotlb_force_bounce)
-		mem->force_bounce = true;
+	mem->force_bounce = swiotlb_force_bounce || (flags & SWIOTLB_FORCE);
 
 	spin_lock_init(&mem->lock);
 	for (i = 0; i < mem->nslabs; i++) {
@@ -275,8 +274,7 @@ retry:
 		panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
 		      __func__, alloc_size, PAGE_SIZE);
 
-	swiotlb_init_io_tlb_mem(mem, __pa(tlb), nslabs, false);
-	mem->force_bounce = flags & SWIOTLB_FORCE;
+	swiotlb_init_io_tlb_mem(mem, __pa(tlb), nslabs, flags, false);
 
 	if (flags & SWIOTLB_VERBOSE)
 		swiotlb_print_info();
@@ -348,7 +346,7 @@ retry:
 
 	set_memory_decrypted((unsigned long)vstart,
 			     (nslabs << IO_TLB_SHIFT) >> PAGE_SHIFT);
-	swiotlb_init_io_tlb_mem(mem, virt_to_phys(vstart), nslabs, true);
+	swiotlb_init_io_tlb_mem(mem, virt_to_phys(vstart), nslabs, 0, true);
 
 	swiotlb_print_info();
 	return 0;
@@ -835,8 +833,8 @@ static int rmem_swiotlb_device_init(struct reserved_mem *rmem,
 
 		set_memory_decrypted((unsigned long)phys_to_virt(rmem->base),
 				     rmem->size >> PAGE_SHIFT);
-		swiotlb_init_io_tlb_mem(mem, rmem->base, nslabs, false);
-		mem->force_bounce = true;
+		swiotlb_init_io_tlb_mem(mem, rmem->base, nslabs, SWIOTLB_FORCE,
+				false);
 		mem->for_alloc = true;
 
 		rmem->priv = mem;