Merge tag 'dma-mapping-6.6-2023-08-29' of git://git.infradead.org/users/hch/dma-mappingHEADmaster

Pull dma-maping updates from Christoph Hellwig:

 - allow dynamic sizing of the swiotlb buffer, to cater for secure
   virtualization workloads that require all I/O to be bounce buffered
   (Petr Tesarik)

 - move a declaration to a header (Arnd Bergmann)

 - check for memory region overlap in dma-contiguous (Binglei Wang)

 - remove the somewhat dangerous runtime swiotlb-xen enablement and
   unexport is_swiotlb_active (Christoph Hellwig, Juergen Gross)

 - per-node CMA improvements (Yajun Deng)

* tag 'dma-mapping-6.6-2023-08-29' of git://git.infradead.org/users/hch/dma-mapping:
  swiotlb: optimize get_max_slots()
  swiotlb: move slot allocation explanation comment where it belongs
  swiotlb: search the software IO TLB only if the device makes use of it
  swiotlb: allocate a new memory pool when existing pools are full
  swiotlb: determine potential physical address limit
  swiotlb: if swiotlb is full, fall back to a transient memory pool
  swiotlb: add a flag whether SWIOTLB is allowed to grow
  swiotlb: separate memory pool data from other allocator data
  swiotlb: add documentation and rename swiotlb_do_find_slots()
  swiotlb: make io_tlb_default_mem local to swiotlb.c
  swiotlb: bail out of swiotlb_init_late() if swiotlb is already allocated
  dma-contiguous: check for memory region overlap
  dma-contiguous: support numa CMA for specified node
  dma-contiguous: support per-numa CMA for all architectures
  dma-mapping: move arch_dma_set_mask() declaration to header
  swiotlb: unexport is_swiotlb_active
  x86: always initialize xen-swiotlb when xen-pcifront is enabling
  xen/pci: add flag for PCI passthrough being possible

23 files changed, 910 insertions, 187 deletions

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index e5d71ba4e6ae21..93f646e0b4b59b 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -696,7 +696,7 @@
 			kernel/dma/contiguous.c
 
 	cma_pernuma=nn[MG]
-			[ARM64,KNL,CMA]
+			[KNL,CMA]
 			Sets the size of kernel per-numa memory area for
 			contiguous memory allocations. A value of 0 disables
 			per-numa CMA altogether. And If this option is not
@@ -706,6 +706,17 @@
 			which is located in node nid, if the allocation fails,
 			they will fallback to the global default memory area.
 
+	numa_cma=<node>:nn[MG][,<node>:nn[MG]]
+			[KNL,CMA]
+			Sets the size of kernel numa memory area for
+			contiguous memory allocations. It will reserve CMA
+			area for the specified node.
+
+			With numa CMA enabled, DMA users on node nid will
+			first try to allocate buffer from the numa area
+			which is located in node nid, if the allocation fails,
+			they will fallback to the global default memory area.
+
 	cmo_free_hint=	[PPC] Format: { yes | no }
 			Specify whether pages are marked as being inactive
 			when they are freed.  This is used in CMO environments
diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
index 3d826c0b5feecb..882cd70c7a2f24 100644
--- a/arch/arm/xen/mm.c
+++ b/arch/arm/xen/mm.c
@@ -125,12 +125,10 @@ static int __init xen_mm_init(void)
 		return 0;
 
 	/* we can work with the default swiotlb */
-	if (!io_tlb_default_mem.nslabs) {
-		rc = swiotlb_init_late(swiotlb_size_or_default(),
-				       xen_swiotlb_gfp(), NULL);
-		if (rc < 0)
-			return rc;
-	}
+	rc = swiotlb_init_late(swiotlb_size_or_default(),
+			       xen_swiotlb_gfp(), NULL);
+	if (rc < 0)
+		return rc;
 
 	cflush.op = 0;
 	cflush.a.dev_bus_addr = 0;
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 4fcb88a445efb5..8a0f8604348b87 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -461,8 +461,6 @@ void __init bootmem_init(void)
 	arm64_hugetlb_cma_reserve();
 #endif
 
-	dma_pernuma_cma_reserve();
-
 	kvm_hyp_reserve();
 
 	/*
diff --git a/arch/mips/pci/pci-octeon.c b/arch/mips/pci/pci-octeon.c
index e457a18cbdc590..d19d9d45630921 100644
--- a/arch/mips/pci/pci-octeon.c
+++ b/arch/mips/pci/pci-octeon.c
@@ -664,7 +664,7 @@ static int __init octeon_pci_setup(void)
 
 		/* BAR1 movable regions contiguous to cover the swiotlb */
 		octeon_bar1_pci_phys =
-			io_tlb_default_mem.start & ~((1ull << 22) - 1);
+			default_swiotlb_base() & ~((1ull << 22) - 1);
 
 		for (index = 0; index < 32; index++) {
 			union cvmx_pci_bar1_indexx bar1_index;
diff --git a/arch/powerpc/kernel/dma-mask.c b/arch/powerpc/kernel/dma-mask.c
index ffbbbc43261267..5b07ca7b73aacb 100644
--- a/arch/powerpc/kernel/dma-mask.c
+++ b/arch/powerpc/kernel/dma-mask.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 
 #include <linux/dma-mapping.h>
+#include <linux/dma-map-ops.h>
 #include <linux/export.h>
 #include <asm/machdep.h>
 
diff --git a/arch/x86/include/asm/xen/swiotlb-xen.h b/arch/x86/include/asm/xen/swiotlb-xen.h
index 77a2d19cc9909e..abde0f44df57dc 100644
--- a/arch/x86/include/asm/xen/swiotlb-xen.h
+++ b/arch/x86/include/asm/xen/swiotlb-xen.h
@@ -2,12 +2,6 @@
 #ifndef _ASM_X86_SWIOTLB_XEN_H
 #define _ASM_X86_SWIOTLB_XEN_H
 
-#ifdef CONFIG_SWIOTLB_XEN
-extern int pci_xen_swiotlb_init_late(void);
-#else
-static inline int pci_xen_swiotlb_init_late(void) { return -ENXIO; }
-#endif
-
 int xen_swiotlb_fixup(void *buf, unsigned long nslabs);
 int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
 				unsigned int address_bits,
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index de6be0a3965ee4..f323d83e40a70b 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -72,9 +72,15 @@ static inline void __init pci_swiotlb_detect(void)
 #endif /* CONFIG_SWIOTLB */
 
 #ifdef CONFIG_SWIOTLB_XEN
+static bool xen_swiotlb_enabled(void)
+{
+	return xen_initial_domain() || x86_swiotlb_enable ||
+		(IS_ENABLED(CONFIG_XEN_PCIDEV_FRONTEND) && xen_pv_pci_possible);
+}
+
 static void __init pci_xen_swiotlb_init(void)
 {
-	if (!xen_initial_domain() && !x86_swiotlb_enable)
+	if (!xen_swiotlb_enabled())
 		return;
 	x86_swiotlb_enable = true;
 	x86_swiotlb_flags |= SWIOTLB_ANY;
@@ -83,27 +89,6 @@ static void __init pci_xen_swiotlb_init(void)
 	if (IS_ENABLED(CONFIG_PCI))
 		pci_request_acs();
 }
-
-int pci_xen_swiotlb_init_late(void)
-{
-	if (dma_ops == &xen_swiotlb_dma_ops)
-		return 0;
-
-	/* we can work with the default swiotlb */
-	if (!io_tlb_default_mem.nslabs) {
-		int rc = swiotlb_init_late(swiotlb_size_or_default(),
-					   GFP_KERNEL, xen_swiotlb_fixup);
-		if (rc < 0)
-			return rc;
-	}
-
-	/* XXX: this switches the dma ops under live devices! */
-	dma_ops = &xen_swiotlb_dma_ops;
-	if (IS_ENABLED(CONFIG_PCI))
-		pci_request_acs();
-	return 0;
-}
-EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late);
 #else
 static inline void __init pci_xen_swiotlb_init(void)
 {
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 50c998b844fb49..b3e37961065a2c 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -44,6 +44,9 @@ struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
 /* Number of pages released from the initial allocation. */
 unsigned long xen_released_pages;
 
+/* Memory map would allow PCI passthrough. */
+bool xen_pv_pci_possible;
+
 /* E820 map used during setting up memory. */
 static struct e820_table xen_e820_table __initdata;
 
@@ -814,6 +817,9 @@ char * __init xen_memory_setup(void)
 		chunk_size = size;
 		type = xen_e820_table.entries[i].type;
 
+		if (type == E820_TYPE_RESERVED)
+			xen_pv_pci_possible = true;
+
 		if (type == E820_TYPE_RAM) {
 			if (addr < mem_end) {
 				chunk_size = min(size, mem_end - addr);
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 3dff5037943e02..46d1d78c5beb08 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -3108,9 +3108,7 @@ void device_initialize(struct device *dev)
     defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
 	dev->dma_coherent = dma_default_coherent;
 #endif
-#ifdef CONFIG_SWIOTLB
-	dev->dma_io_tlb_mem = &io_tlb_default_mem;
-#endif
+	swiotlb_dev_init(dev);
 }
 EXPORT_SYMBOL_GPL(device_initialize);
 
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index 83c0ab50676dff..11636634ae512f 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -22,7 +22,6 @@
 #include <linux/bitops.h>
 #include <linux/time.h>
 #include <linux/ktime.h>
-#include <linux/swiotlb.h>
 #include <xen/platform_pci.h>
 
 #include <asm/xen/swiotlb-xen.h>
@@ -669,11 +668,6 @@ static int pcifront_connect_and_init_dma(struct pcifront_device *pdev)
 
 	spin_unlock(&pcifront_dev_lock);
 
-	if (!err && !is_swiotlb_active(&pdev->xdev->dev)) {
-		err = pci_xen_swiotlb_init_late();
-		if (err)
-			dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n");
-	}
 	return err;
 }
 
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 67aa74d201627d..946bd56f0ac53e 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -381,7 +381,7 @@ xen_swiotlb_sync_sg_for_device(struct device *dev, struct scatterlist *sgl,
 static int
 xen_swiotlb_dma_supported(struct device *hwdev, u64 mask)
 {
-	return xen_phys_to_dma(hwdev, io_tlb_default_mem.end - 1) <= mask;
+	return xen_phys_to_dma(hwdev, default_swiotlb_limit()) <= mask;
 }
 
 const struct dma_map_ops xen_swiotlb_dma_ops = {
diff --git a/include/linux/device.h b/include/linux/device.h
index bbaeabd04b0d2f..6fc808d22bfdaf 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -625,7 +625,10 @@ struct device_physical_location {
  * @dma_pools:	Dma pools (if dma'ble device).
  * @dma_mem:	Internal for coherent mem override.
  * @cma_area:	Contiguous memory area for dma allocations
- * @dma_io_tlb_mem: Pointer to the swiotlb pool used.  Not for driver use.
+ * @dma_io_tlb_mem: Software IO TLB allocator.  Not for driver use.
+ * @dma_io_tlb_pools:	List of transient swiotlb memory pools.
+ * @dma_io_tlb_lock:	Protects changes to the list of active pools.
+ * @dma_uses_io_tlb: %true if device has used the software IO TLB.
  * @archdata:	For arch-specific additions.
  * @of_node:	Associated device tree node.
  * @fwnode:	Associated device node supplied by platform firmware.
@@ -732,6 +735,11 @@ struct device {
 #ifdef CONFIG_SWIOTLB
 	struct io_tlb_mem *dma_io_tlb_mem;
 #endif
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+	struct list_head dma_io_tlb_pools;
+	spinlock_t dma_io_tlb_lock;
+	bool dma_uses_io_tlb;
+#endif
 	/* arch specific additions */
 	struct dev_archdata	archdata;
 
diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h
index 9bf19b5bf7559f..f2fc203fb8a1a2 100644
--- a/include/linux/dma-map-ops.h
+++ b/include/linux/dma-map-ops.h
@@ -169,12 +169,6 @@ static inline void dma_free_contiguous(struct device *dev, struct page *page,
 }
 #endif /* CONFIG_DMA_CMA*/
 
-#ifdef CONFIG_DMA_PERNUMA_CMA
-void dma_pernuma_cma_reserve(void);
-#else
-static inline void dma_pernuma_cma_reserve(void) { }
-#endif /* CONFIG_DMA_PERNUMA_CMA */
-
 #ifdef CONFIG_DMA_DECLARE_COHERENT
 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 		dma_addr_t device_addr, size_t size);
@@ -343,6 +337,12 @@ void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
 void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
 		dma_addr_t dma_addr, unsigned long attrs);
 
+#ifdef CONFIG_ARCH_HAS_DMA_SET_MASK
+void arch_dma_set_mask(struct device *dev, u64 mask);
+#else
+#define arch_dma_set_mask(dev, mask)	do { } while (0)
+#endif
+
 #ifdef CONFIG_MMU
 /*
  * Page protection so that devices that can't snoop CPU caches can use the
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index e13050eb97771a..f0ccca16a0aca1 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -418,6 +418,8 @@ static inline void dma_sync_sgtable_for_device(struct device *dev,
 #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)
 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)
 
+bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size);
+
 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 		dma_addr_t *dma_handle, gfp_t gfp)
 {
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 4e52cd5e0bdcce..b4536626f8ff35 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -8,6 +8,7 @@
 #include <linux/types.h>
 #include <linux/limits.h>
 #include <linux/spinlock.h>
+#include <linux/workqueue.h>
 
 struct device;
 struct page;
@@ -62,8 +63,7 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys,
 #ifdef CONFIG_SWIOTLB
 
 /**
- * struct io_tlb_mem - IO TLB Memory Pool Descriptor
- *
+ * struct io_tlb_pool - IO TLB memory pool descriptor
  * @start:	The start address of the swiotlb memory pool. Used to do a quick
  *		range check to see if the memory was in fact allocated by this
  *		API.
@@ -73,19 +73,48 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys,
  * @vaddr:	The vaddr of the swiotlb memory pool. The swiotlb memory pool
  *		may be remapped in the memory encrypted case and store virtual
  *		address for bounce buffer operation.
- * @nslabs:	The number of IO TLB blocks (in groups of 64) between @start and
- *		@end. For default swiotlb, this is command line adjustable via
- *		setup_io_tlb_npages.
- * @list:	The free list describing the number of free entries available
- *		from each index.
- * @orig_addr:	The original address corresponding to a mapped entry.
- * @alloc_size:	Size of the allocated buffer.
+ * @nslabs:	The number of IO TLB slots between @start and @end. For the
+ *		default swiotlb, this can be adjusted with a boot parameter,
+ *		see setup_io_tlb_npages().
+ * @late_alloc:	%true if allocated using the page allocator.
+ * @nareas:	Number of areas in the pool.
+ * @area_nslabs: Number of slots in each area.
+ * @areas:	Array of memory area descriptors.
+ * @slots:	Array of slot descriptors.
+ * @node:	Member of the IO TLB memory pool list.
+ * @rcu:	RCU head for swiotlb_dyn_free().
+ * @transient:  %true if transient memory pool.
+ */
+struct io_tlb_pool {
+	phys_addr_t start;
+	phys_addr_t end;
+	void *vaddr;
+	unsigned long nslabs;
+	bool late_alloc;
+	unsigned int nareas;
+	unsigned int area_nslabs;
+	struct io_tlb_area *areas;
+	struct io_tlb_slot *slots;
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+	struct list_head node;
+	struct rcu_head rcu;
+	bool transient;
+#endif
+};
+
+/**
+ * struct io_tlb_mem - Software IO TLB allocator
+ * @defpool:	Default (initial) IO TLB memory pool descriptor.
+ * @pool:	IO TLB memory pool descriptor (if not dynamic).
+ * @nslabs:	Total number of IO TLB slabs in all pools.
  * @debugfs:	The dentry to debugfs.
- * @late_alloc:	%true if allocated using the page allocator
  * @force_bounce: %true if swiotlb bouncing is forced
  * @for_alloc:  %true if the pool is used for memory allocation
- * @nareas:  The area number in the pool.
- * @area_nslabs: The slot number in the area.
+ * @can_grow:	%true if more pools can be allocated dynamically.
+ * @phys_limit:	Maximum allowed physical address.
+ * @lock:	Lock to synchronize changes to the list.
+ * @pools:	List of IO TLB memory pool descriptors (if dynamic).
+ * @dyn_alloc:	Dynamic IO TLB pool allocation work.
  * @total_used:	The total number of slots in the pool that are currently used
  *		across all areas. Used only for calculating used_hiwater in
  *		debugfs.
@@ -93,30 +122,64 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys,
  *		in debugfs.
  */
 struct io_tlb_mem {
-	phys_addr_t start;
-	phys_addr_t end;
-	void *vaddr;
+	struct io_tlb_pool defpool;
 	unsigned long nslabs;
 	struct dentry *debugfs;
-	bool late_alloc;
 	bool force_bounce;
 	bool for_alloc;
-	unsigned int nareas;
-	unsigned int area_nslabs;
-	struct io_tlb_area *areas;
-	struct io_tlb_slot *slots;
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+	bool can_grow;
+	u64 phys_limit;
+	spinlock_t lock;
+	struct list_head pools;
+	struct work_struct dyn_alloc;
+#endif
 #ifdef CONFIG_DEBUG_FS
 	atomic_long_t total_used;
 	atomic_long_t used_hiwater;
 #endif
 };
-extern struct io_tlb_mem io_tlb_default_mem;
 
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+
+struct io_tlb_pool *swiotlb_find_pool(struct device *dev, phys_addr_t paddr);
+
+#else
+
+static inline struct io_tlb_pool *swiotlb_find_pool(struct device *dev,
+						    phys_addr_t paddr)
+{
+	return &dev->dma_io_tlb_mem->defpool;
+}
+
+#endif
+
+/**
+ * is_swiotlb_buffer() - check if a physical address belongs to a swiotlb
+ * @dev:        Device which has mapped the buffer.
+ * @paddr:      Physical address within the DMA buffer.
+ *
+ * Check if @paddr points into a bounce buffer.
+ *
+ * Return:
+ * * %true if @paddr points into a bounce buffer
+ * * %false otherwise
+ */
 static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr)
 {
 	struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
 
-	return mem && paddr >= mem->start && paddr < mem->end;
+	if (!mem)
+		return false;
+
+	if (IS_ENABLED(CONFIG_SWIOTLB_DYNAMIC)) {
+		/* Pairs with smp_wmb() in swiotlb_find_slots() and
+		 * swiotlb_dyn_alloc(), which modify the RCU lists.
+		 */
+		smp_rmb();
+		return swiotlb_find_pool(dev, paddr);
+	}
+	return paddr >= mem->defpool.start && paddr < mem->defpool.end;
 }
 
 static inline bool is_swiotlb_force_bounce(struct device *dev)
@@ -128,13 +191,22 @@ static inline bool is_swiotlb_force_bounce(struct device *dev)
 
 void swiotlb_init(bool addressing_limited, unsigned int flags);
 void __init swiotlb_exit(void);
+void swiotlb_dev_init(struct device *dev);
 size_t swiotlb_max_mapping_size(struct device *dev);
+bool is_swiotlb_allocated(void);
 bool is_swiotlb_active(struct device *dev);
 void __init swiotlb_adjust_size(unsigned long size);
+phys_addr_t default_swiotlb_base(void);
+phys_addr_t default_swiotlb_limit(void);
 #else
 static inline void swiotlb_init(bool addressing_limited, unsigned int flags)
 {
 }
+
+static inline void swiotlb_dev_init(struct device *dev)
+{
+}
+
 static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr)
 {
 	return false;
@@ -151,6 +223,11 @@ static inline size_t swiotlb_max_mapping_size(struct device *dev)
 	return SIZE_MAX;
 }
 
+static inline bool is_swiotlb_allocated(void)
+{
+	return false;
+}
+
 static inline bool is_swiotlb_active(struct device *dev)
 {
 	return false;
@@ -159,6 +236,16 @@ static inline bool is_swiotlb_active(struct device *dev)
 static inline void swiotlb_adjust_size(unsigned long size)
 {
 }
+
+static inline phys_addr_t default_swiotlb_base(void)
+{
+	return 0;
+}
+
+static inline phys_addr_t default_swiotlb_limit(void)
+{
+	return 0;
+}
 #endif /* CONFIG_SWIOTLB */
 
 extern void swiotlb_print_info(void);
diff --git a/include/xen/xen.h b/include/xen/xen.h
index f989162983c34c..a1e5b3f18d69f9 100644
--- a/include/xen/xen.h
+++ b/include/xen/xen.h
@@ -29,6 +29,12 @@ extern bool xen_pvh;
 
 extern uint32_t xen_start_flags;
 
+#ifdef CONFIG_XEN_PV
+extern bool xen_pv_pci_possible;
+#else
+#define xen_pv_pci_possible	0
+#endif
+
 #include <xen/interface/hvm/start_info.h>
 extern struct hvm_start_info pvh_start_info;
 void xen_prepare_pvh(void);
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 11d07700320527..4c1e9a3c0ab6f0 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -90,6 +90,19 @@ config SWIOTLB
 	bool
 	select NEED_DMA_MAP_STATE
 
+config SWIOTLB_DYNAMIC
+	bool "Dynamic allocation of DMA bounce buffers"
+	default n
+	depends on SWIOTLB
+	help
+	  This enables dynamic resizing of the software IO TLB. The kernel
+	  starts with one memory pool at boot and it will allocate additional
+	  pools as needed. To reduce run-time kernel memory requirements, you
+	  may have to specify a smaller size of the initial pool using
+	  "swiotlb=" on the kernel command line.
+
+	  If unsure, say N.
+
 config DMA_BOUNCE_UNALIGNED_KMALLOC
 	bool
 	depends on SWIOTLB
@@ -145,15 +158,16 @@ config DMA_CMA
 
 if  DMA_CMA
 
-config DMA_PERNUMA_CMA
-	bool "Enable separate DMA Contiguous Memory Area for each NUMA Node"
-	default NUMA && ARM64
+config DMA_NUMA_CMA
+	bool "Enable separate DMA Contiguous Memory Area for NUMA Node"
+	default NUMA
 	help
-	  Enable this option to get pernuma CMA areas so that devices like
-	  ARM64 SMMU can get local memory by DMA coherent APIs.
+	  Enable this option to get numa CMA areas so that NUMA devices
+	  can get local memory by DMA coherent APIs.
 
 	  You can set the size of pernuma CMA by specifying "cma_pernuma=size"
-	  on the kernel's command line.
+	  or set the node id and its size of CMA by specifying "numa_cma=
+	  <node>:size[,<node>:size]" on the kernel's command line.
 
 comment "Default contiguous memory area size:"
 
diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c
index 6ea80ae426228d..88c595e49e3452 100644
--- a/kernel/dma/contiguous.c
+++ b/kernel/dma/contiguous.c
@@ -50,6 +50,7 @@
 #include <linux/sizes.h>
 #include <linux/dma-map-ops.h>
 #include <linux/cma.h>
+#include <linux/nospec.h>
 
 #ifdef CONFIG_CMA_SIZE_MBYTES
 #define CMA_SIZE_MBYTES CONFIG_CMA_SIZE_MBYTES
@@ -96,11 +97,44 @@ static int __init early_cma(char *p)
 }
 early_param("cma", early_cma);
 
-#ifdef CONFIG_DMA_PERNUMA_CMA
+#ifdef CONFIG_DMA_NUMA_CMA
 
+static struct cma *dma_contiguous_numa_area[MAX_NUMNODES];
+static phys_addr_t numa_cma_size[MAX_NUMNODES] __initdata;
 static struct cma *dma_contiguous_pernuma_area[MAX_NUMNODES];
 static phys_addr_t pernuma_size_bytes __initdata;
 
+static int __init early_numa_cma(char *p)
+{
+	int nid, count = 0;
+	unsigned long tmp;
+	char *s = p;
+
+	while (*s) {
+		if (sscanf(s, "%lu%n", &tmp, &count) != 1)
+			break;
+
+		if (s[count] == ':') {
+			if (tmp >= MAX_NUMNODES)
+				break;
+			nid = array_index_nospec(tmp, MAX_NUMNODES);
+
+			s += count + 1;
+			tmp = memparse(s, &s);
+			numa_cma_size[nid] = tmp;
+
+			if (*s == ',')
+				s++;
+			else
+				break;
+		} else
+			break;
+	}
+
+	return 0;
+}
+early_param("numa_cma", early_numa_cma);
+
 static int __init early_cma_pernuma(char *p)
 {
 	pernuma_size_bytes = memparse(p, &p);
@@ -127,32 +161,49 @@ static inline __maybe_unused phys_addr_t cma_early_percent_memory(void)
 
 #endif
 
-#ifdef CONFIG_DMA_PERNUMA_CMA
-void __init dma_pernuma_cma_reserve(void)
+#ifdef CONFIG_DMA_NUMA_CMA
+static void __init dma_numa_cma_reserve(void)
 {
 	int nid;
 
-	if (!pernuma_size_bytes)
-		return;
-
-	for_each_online_node(nid) {
+	for_each_node(nid) {
 		int ret;
 		char name[CMA_MAX_NAME];
-		struct cma **cma = &dma_contiguous_pernuma_area[nid];
-
-		snprintf(name, sizeof(name), "pernuma%d", nid);
-		ret = cma_declare_contiguous_nid(0, pernuma_size_bytes, 0, 0,
-						 0, false, name, cma, nid);
-		if (ret) {
-			pr_warn("%s: reservation failed: err %d, node %d", __func__,
-				ret, nid);
+		struct cma **cma;
+
+		if (!node_online(nid)) {
+			if (pernuma_size_bytes || numa_cma_size[nid])
+				pr_warn("invalid node %d specified\n", nid);
 			continue;
 		}
 
-		pr_debug("%s: reserved %llu MiB on node %d\n", __func__,
-			(unsigned long long)pernuma_size_bytes / SZ_1M, nid);
+		if (pernuma_size_bytes) {
+
+			cma = &dma_contiguous_pernuma_area[nid];
+			snprintf(name, sizeof(name), "pernuma%d", nid);
+			ret = cma_declare_contiguous_nid(0, pernuma_size_bytes, 0, 0,
+							 0, false, name, cma, nid);
+			if (ret)
+				pr_warn("%s: reservation failed: err %d, node %d", __func__,
+					ret, nid);
+		}
+
+		if (numa_cma_size[nid]) {
+
+			cma = &dma_contiguous_numa_area[nid];
+			snprintf(name, sizeof(name), "numa%d", nid);
+			ret = cma_declare_contiguous_nid(0, numa_cma_size[nid], 0, 0, 0, false,
+							 name, cma, nid);
+			if (ret)
+				pr_warn("%s: reservation failed: err %d, node %d", __func__,
+					ret, nid);
+		}
 	}
 }
+#else
+static inline void __init dma_numa_cma_reserve(void)
+{
+}
 #endif
 
 /**
@@ -171,6 +222,8 @@ void __init dma_contiguous_reserve(phys_addr_t limit)
 	phys_addr_t selected_limit = limit;
 	bool fixed = false;
 
+	dma_numa_cma_reserve();
+
 	pr_debug("%s(limit %08lx)\n", __func__, (unsigned long)limit);
 
 	if (size_cmdline != -1) {
@@ -303,7 +356,7 @@ static struct page *cma_alloc_aligned(struct cma *cma, size_t size, gfp_t gfp)
  */
 struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp)
 {
-#ifdef CONFIG_DMA_PERNUMA_CMA
+#ifdef CONFIG_DMA_NUMA_CMA
 	int nid = dev_to_node(dev);
 #endif
 
@@ -315,7 +368,7 @@ struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp)
 	if (size <= PAGE_SIZE)
 		return NULL;
 
-#ifdef CONFIG_DMA_PERNUMA_CMA
+#ifdef CONFIG_DMA_NUMA_CMA
 	if (nid != NUMA_NO_NODE && !(gfp & (GFP_DMA | GFP_DMA32))) {
 		struct cma *cma = dma_contiguous_pernuma_area[nid];
 		struct page *page;
@@ -325,6 +378,13 @@ struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp)
 			if (page)
 				return page;
 		}
+
+		cma = dma_contiguous_numa_area[nid];
+		if (cma) {
+			page = cma_alloc_aligned(cma, size, gfp);
+			if (page)
+				return page;
+		}
 	}
 #endif
 	if (!dma_contiguous_default_area)
@@ -356,10 +416,13 @@ void dma_free_contiguous(struct device *dev, struct page *page, size_t size)
 		/*
 		 * otherwise, page is from either per-numa cma or default cma
 		 */
-#ifdef CONFIG_DMA_PERNUMA_CMA
+#ifdef CONFIG_DMA_NUMA_CMA
 		if (cma_release(dma_contiguous_pernuma_area[page_to_nid(page)],
 					page, count))
 			return;
+		if (cma_release(dma_contiguous_numa_area[page_to_nid(page)],
+					page, count))
+			return;
 #endif
 		if (cma_release(dma_contiguous_default_area, page, count))
 			return;
@@ -410,6 +473,11 @@ static int __init rmem_cma_setup(struct reserved_mem *rmem)
 		return -EBUSY;
 	}
 
+	if (memblock_is_region_reserved(rmem->base, rmem->size)) {
+		pr_info("Reserved memory: overlap with other memblock reserved region\n");
+		return -EBUSY;
+	}
+
 	if (!of_get_flat_dt_prop(node, "reusable", NULL) ||
 	    of_get_flat_dt_prop(node, "no-map", NULL))
 		return -EINVAL;
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index d29cade048db19..9596ae1aa0dacf 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -66,7 +66,7 @@ static gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 *phys_limit)
 	return 0;
 }
 
-static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)
+bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)
 {
 	dma_addr_t dma_addr = phys_to_dma_direct(dev, phys);
 
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 9a4db5cce60041..e323ca48f7f2a4 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -760,12 +760,6 @@ bool dma_pci_p2pdma_supported(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(dma_pci_p2pdma_supported);
 
-#ifdef CONFIG_ARCH_HAS_DMA_SET_MASK
-void arch_dma_set_mask(struct device *dev, u64 mask);
-#else
-#define arch_dma_set_mask(dev, mask)	do { } while (0)
-#endif
-
 int dma_set_mask(struct device *dev, u64 mask)
 {
 	/*
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 2b83e3ad9dca10..394494a6b1f35c 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -35,6 +35,7 @@
 #include <linux/memblock.h>
 #include <linux/mm.h>
 #include <linux/pfn.h>
+#include <linux/rculist.h>
 #include <linux/scatterlist.h>
 #include <linux/set_memory.h>
 #include <linux/spinlock.h>
@@ -62,6 +63,13 @@
 
 #define INVALID_PHYS_ADDR (~(phys_addr_t)0)
 
+/**
+ * struct io_tlb_slot - IO TLB slot descriptor
+ * @orig_addr:	The original address corresponding to a mapped entry.
+ * @alloc_size:	Size of the allocated buffer.
+ * @list:	The free list describing the number of free entries available
+ *		from each index.
+ */
 struct io_tlb_slot {
 	phys_addr_t orig_addr;
 	size_t alloc_size;
@@ -71,7 +79,22 @@ struct io_tlb_slot {
 static bool swiotlb_force_bounce;
 static bool swiotlb_force_disable;
 
-struct io_tlb_mem io_tlb_default_mem;
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+
+static void swiotlb_dyn_alloc(struct work_struct *work);
+
+static struct io_tlb_mem io_tlb_default_mem = {
+	.lock = __SPIN_LOCK_UNLOCKED(io_tlb_default_mem.lock),
+	.pools = LIST_HEAD_INIT(io_tlb_default_mem.pools),
+	.dyn_alloc = __WORK_INITIALIZER(io_tlb_default_mem.dyn_alloc,
+					swiotlb_dyn_alloc),
+};
+
+#else  /* !CONFIG_SWIOTLB_DYNAMIC */
+
+static struct io_tlb_mem io_tlb_default_mem;
+
+#endif	/* CONFIG_SWIOTLB_DYNAMIC */
 
 static unsigned long default_nslabs = IO_TLB_DEFAULT_SIZE >> IO_TLB_SHIFT;
 static unsigned long default_nareas;
@@ -202,7 +225,7 @@ void __init swiotlb_adjust_size(unsigned long size)
 
 void swiotlb_print_info(void)
 {
-	struct io_tlb_mem *mem = &io_tlb_default_mem;
+	struct io_tlb_pool *mem = &io_tlb_default_mem.defpool;
 
 	if (!mem->nslabs) {
 		pr_warn("No low mem\n");
@@ -231,7 +254,7 @@ static inline unsigned long nr_slots(u64 val)
  */
 void __init swiotlb_update_mem_attributes(void)
 {
-	struct io_tlb_mem *mem = &io_tlb_default_mem;
+	struct io_tlb_pool *mem = &io_tlb_default_mem.defpool;
 	unsigned long bytes;
 
 	if (!mem->nslabs || mem->late_alloc)
@@ -240,9 +263,8 @@ void __init swiotlb_update_mem_attributes(void)
 	set_memory_decrypted((unsigned long)mem->vaddr, bytes >> PAGE_SHIFT);
 }
 
-static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
-		unsigned long nslabs, unsigned int flags,
-		bool late_alloc, unsigned int nareas)
+static void swiotlb_init_io_tlb_pool(struct io_tlb_pool *mem, phys_addr_t start,
+		unsigned long nslabs, bool late_alloc, unsigned int nareas)
 {
 	void *vaddr = phys_to_virt(start);
 	unsigned long bytes = nslabs << IO_TLB_SHIFT, i;
@@ -254,8 +276,6 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
 	mem->nareas = nareas;
 	mem->area_nslabs = nslabs / mem->nareas;
 
-	mem->force_bounce = swiotlb_force_bounce || (flags & SWIOTLB_FORCE);
-
 	for (i = 0; i < mem->nareas; i++) {
 		spin_lock_init(&mem->areas[i].lock);
 		mem->areas[i].index = 0;
@@ -273,6 +293,23 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
 	return;
 }
 
+/**
+ * add_mem_pool() - add a memory pool to the allocator
+ * @mem:	Software IO TLB allocator.
+ * @pool:	Memory pool to be added.
+ */
+static void add_mem_pool(struct io_tlb_mem *mem, struct io_tlb_pool *pool)
+{
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+	spin_lock(&mem->lock);
+	list_add_rcu(&pool->node, &mem->pools);
+	mem->nslabs += pool->nslabs;
+	spin_unlock(&mem->lock);
+#else
+	mem->nslabs = pool->nslabs;
+#endif
+}
+
 static void __init *swiotlb_memblock_alloc(unsigned long nslabs,
 		unsigned int flags,
 		int (*remap)(void *tlb, unsigned long nslabs))
@@ -312,7 +349,7 @@ static void __init *swiotlb_memblock_alloc(unsigned long nslabs,
 void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
 		int (*remap)(void *tlb, unsigned long nslabs))
 {
-	struct io_tlb_mem *mem = &io_tlb_default_mem;
+	struct io_tlb_pool *mem = &io_tlb_default_mem.defpool;
 	unsigned long nslabs;
 	unsigned int nareas;
 	size_t alloc_size;
@@ -323,6 +360,18 @@ void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
 	if (swiotlb_force_disable)
 		return;
 
+	io_tlb_default_mem.force_bounce =
+		swiotlb_force_bounce || (flags & SWIOTLB_FORCE);
+
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+	if (!remap)
+		io_tlb_default_mem.can_grow = true;
+	if (flags & SWIOTLB_ANY)
+		io_tlb_default_mem.phys_limit = virt_to_phys(high_memory - 1);
+	else
+		io_tlb_default_mem.phys_limit = ARCH_LOW_ADDRESS_LIMIT;
+#endif
+
 	if (!default_nareas)
 		swiotlb_adjust_nareas(num_possible_cpus());
 
@@ -356,8 +405,9 @@ void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
 		return;
 	}
 
-	swiotlb_init_io_tlb_mem(mem, __pa(tlb), nslabs, flags, false,
-				default_nareas);
+	swiotlb_init_io_tlb_pool(mem, __pa(tlb), nslabs, false,
+				 default_nareas);
+	add_mem_pool(&io_tlb_default_mem, mem);
 
 	if (flags & SWIOTLB_VERBOSE)
 		swiotlb_print_info();
@@ -376,7 +426,7 @@ void __init swiotlb_init(bool addressing_limit, unsigned int flags)
 int swiotlb_init_late(size_t size, gfp_t gfp_mask,
 		int (*remap)(void *tlb, unsigned long nslabs))
 {
-	struct io_tlb_mem *mem = &io_tlb_default_mem;
+	struct io_tlb_pool *mem = &io_tlb_default_mem.defpool;
 	unsigned long nslabs = ALIGN(size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
 	unsigned int nareas;
 	unsigned char *vstart = NULL;
@@ -384,9 +434,25 @@ int swiotlb_init_late(size_t size, gfp_t gfp_mask,
 	bool retried = false;
 	int rc = 0;
 
+	if (io_tlb_default_mem.nslabs)
+		return 0;
+
 	if (swiotlb_force_disable)
 		return 0;
 
+	io_tlb_default_mem.force_bounce = swiotlb_force_bounce;
+
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+	if (!remap)
+		io_tlb_default_mem.can_grow = true;
+	if (IS_ENABLED(CONFIG_ZONE_DMA) && (gfp_mask & __GFP_DMA))
+		io_tlb_default_mem.phys_limit = DMA_BIT_MASK(zone_dma_bits);
+	else if (IS_ENABLED(CONFIG_ZONE_DMA32) && (gfp_mask & __GFP_DMA32))
+		io_tlb_default_mem.phys_limit = DMA_BIT_MASK(32);
+	else
+		io_tlb_default_mem.phys_limit = virt_to_phys(high_memory - 1);
+#endif
+
 	if (!default_nareas)
 		swiotlb_adjust_nareas(num_possible_cpus());
 
@@ -438,8 +504,9 @@ retry:
 
 	set_memory_decrypted((unsigned long)vstart,
 			     (nslabs << IO_TLB_SHIFT) >> PAGE_SHIFT);
-	swiotlb_init_io_tlb_mem(mem, virt_to_phys(vstart), nslabs, 0, true,
-				nareas);
+	swiotlb_init_io_tlb_pool(mem, virt_to_phys(vstart), nslabs, true,
+				 nareas);
+	add_mem_pool(&io_tlb_default_mem, mem);
 
 	swiotlb_print_info();
 	return 0;
@@ -453,7 +520,7 @@ error_area:
 
 void __init swiotlb_exit(void)
 {
-	struct io_tlb_mem *mem = &io_tlb_default_mem;
+	struct io_tlb_pool *mem = &io_tlb_default_mem.defpool;
 	unsigned long tbl_vaddr;
 	size_t tbl_size, slots_size;
 	unsigned int area_order;
@@ -486,6 +553,265 @@ void __init swiotlb_exit(void)
 	memset(mem, 0, sizeof(*mem));
 }
 
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+
+/**
+ * alloc_dma_pages() - allocate pages to be used for DMA
+ * @gfp:	GFP flags for the allocation.
+ * @bytes:	Size of the buffer.
+ *
+ * Allocate pages from the buddy allocator. If successful, make the allocated
+ * pages decrypted that they can be used for DMA.
+ *
+ * Return: Decrypted pages, or %NULL on failure.
+ */
+static struct page *alloc_dma_pages(gfp_t gfp, size_t bytes)
+{
+	unsigned int order = get_order(bytes);
+	struct page *page;
+	void *vaddr;
+
+	page = alloc_pages(gfp, order);
+	if (!page)
+		return NULL;
+
+	vaddr = page_address(page);
+	if (set_memory_decrypted((unsigned long)vaddr, PFN_UP(bytes)))
+		goto error;
+	return page;
+
+error:
+	__free_pages(page, order);
+	return NULL;
+}
+
+/**
+ * swiotlb_alloc_tlb() - allocate a dynamic IO TLB buffer
+ * @dev:	Device for which a memory pool is allocated.
+ * @bytes:	Size of the buffer.
+ * @phys_limit:	Maximum allowed physical address of the buffer.
+ * @gfp:	GFP flags for the allocation.
+ *
+ * Return: Allocated pages, or %NULL on allocation failure.
+ */
+static struct page *swiotlb_alloc_tlb(struct device *dev, size_t bytes,
+		u64 phys_limit, gfp_t gfp)
+{
+	struct page *page;
+
+	/*
+	 * Allocate from the atomic pools if memory is encrypted and
+	 * the allocation is atomic, because decrypting may block.
+	 */
+	if (!gfpflags_allow_blocking(gfp) && dev && force_dma_unencrypted(dev)) {
+		void *vaddr;
+
+		if (!IS_ENABLED(CONFIG_DMA_COHERENT_POOL))
+			return NULL;
+
+		return dma_alloc_from_pool(dev, bytes, &vaddr, gfp,
+					   dma_coherent_ok);
+	}
+
+	gfp &= ~GFP_ZONEMASK;
+	if (phys_limit <= DMA_BIT_MASK(zone_dma_bits))
+		gfp |= __GFP_DMA;
+	else if (phys_limit <= DMA_BIT_MASK(32))
+		gfp |= __GFP_DMA32;
+
+	while ((page = alloc_dma_pages(gfp, bytes)) &&
+	       page_to_phys(page) + bytes - 1 > phys_limit) {
+		/* allocated, but too high */
+		__free_pages(page, get_order(bytes));
+
+		if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
+		    phys_limit < DMA_BIT_MASK(64) &&
+		    !(gfp & (__GFP_DMA32 | __GFP_DMA)))
+			gfp |= __GFP_DMA32;
+		else if (IS_ENABLED(CONFIG_ZONE_DMA) &&
+			 !(gfp & __GFP_DMA))
+			gfp = (gfp & ~__GFP_DMA32) | __GFP_DMA;
+		else
+			return NULL;
+	}
+
+	return page;
+}
+
+/**
+ * swiotlb_free_tlb() - free a dynamically allocated IO TLB buffer
+ * @vaddr:	Virtual address of the buffer.
+ * @bytes:	Size of the buffer.
+ */
+static void swiotlb_free_tlb(void *vaddr, size_t bytes)
+{
+	if (IS_ENABLED(CONFIG_DMA_COHERENT_POOL) &&
+	    dma_free_from_pool(NULL, vaddr, bytes))
+		return;
+
+	/* Intentional leak if pages cannot be encrypted again. */
+	if (!set_memory_encrypted((unsigned long)vaddr, PFN_UP(bytes)))
+		__free_pages(virt_to_page(vaddr), get_order(bytes));
+}
+
+/**
+ * swiotlb_alloc_pool() - allocate a new IO TLB memory pool
+ * @dev:	Device for which a memory pool is allocated.
+ * @minslabs:	Minimum number of slabs.
+ * @nslabs:	Desired (maximum) number of slabs.
+ * @nareas:	Number of areas.
+ * @phys_limit:	Maximum DMA buffer physical address.
+ * @gfp:	GFP flags for the allocations.
+ *
+ * Allocate and initialize a new IO TLB memory pool. The actual number of
+ * slabs may be reduced if allocation of @nslabs fails. If even
+ * @minslabs cannot be allocated, this function fails.
+ *
+ * Return: New memory pool, or %NULL on allocation failure.
+ */
+static struct io_tlb_pool *swiotlb_alloc_pool(struct device *dev,
+		unsigned long minslabs, unsigned long nslabs,
+		unsigned int nareas, u64 phys_limit, gfp_t gfp)
+{
+	struct io_tlb_pool *pool;
+	unsigned int slot_order;
+	struct page *tlb;
+	size_t pool_size;
+	size_t tlb_size;
+
+	pool_size = sizeof(*pool) + array_size(sizeof(*pool->areas), nareas);
+	pool = kzalloc(pool_size, gfp);
+	if (!pool)
+		goto error;
+	pool->areas = (void *)pool + sizeof(*pool);
+
+	tlb_size = nslabs << IO_TLB_SHIFT;
+	while (!(tlb = swiotlb_alloc_tlb(dev, tlb_size, phys_limit, gfp))) {
+		if (nslabs <= minslabs)
+			goto error_tlb;
+		nslabs = ALIGN(nslabs >> 1, IO_TLB_SEGSIZE);
+		nareas = limit_nareas(nareas, nslabs);
+		tlb_size = nslabs << IO_TLB_SHIFT;
+	}
+
+	slot_order = get_order(array_size(sizeof(*pool->slots), nslabs));
+	pool->slots = (struct io_tlb_slot *)
+		__get_free_pages(gfp, slot_order);
+	if (!pool->slots)
+		goto error_slots;
+
+	swiotlb_init_io_tlb_pool(pool, page_to_phys(tlb), nslabs, true, nareas);
+	return pool;
+
+error_slots:
+	swiotlb_free_tlb(page_address(tlb), tlb_size);
+error_tlb:
+	kfree(pool);
+error:
+	return NULL;
+}
+
+/**
+ * swiotlb_dyn_alloc() - dynamic memory pool allocation worker
+ * @work:	Pointer to dyn_alloc in struct io_tlb_mem.
+ */
+static void swiotlb_dyn_alloc(struct work_struct *work)
+{
+	struct io_tlb_mem *mem =
+		container_of(work, struct io_tlb_mem, dyn_alloc);
+	struct io_tlb_pool *pool;
+
+	pool = swiotlb_alloc_pool(NULL, IO_TLB_MIN_SLABS, default_nslabs,
+				  default_nareas, mem->phys_limit, GFP_KERNEL);
+	if (!pool) {
+		pr_warn_ratelimited("Failed to allocate new pool");
+		return;
+	}
+
+	add_mem_pool(mem, pool);
+
+	/* Pairs with smp_rmb() in is_swiotlb_buffer(). */
+	smp_wmb();
+}
+
+/**
+ * swiotlb_dyn_free() - RCU callback to free a memory pool
+ * @rcu:	RCU head in the corresponding struct io_tlb_pool.
+ */
+static void swiotlb_dyn_free(struct rcu_head *rcu)
+{
+	struct io_tlb_pool *pool = container_of(rcu, struct io_tlb_pool, rcu);
+	size_t slots_size = array_size(sizeof(*pool->slots), pool->nslabs);
+	size_t tlb_size = pool->end - pool->start;
+
+	free_pages((unsigned long)pool->slots, get_order(slots_size));
+	swiotlb_free_tlb(pool->vaddr, tlb_size);
+	kfree(pool);
+}
+
+/**
+ * swiotlb_find_pool() - find the IO TLB pool for a physical address
+ * @dev:        Device which has mapped the DMA buffer.
+ * @paddr:      Physical address within the DMA buffer.
+ *
+ * Find the IO TLB memory pool descriptor which contains the given physical
+ * address, if any.
+ *
+ * Return: Memory pool which contains @paddr, or %NULL if none.
+ */
+struct io_tlb_pool *swiotlb_find_pool(struct device *dev, phys_addr_t paddr)
+{
+	struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
+	struct io_tlb_pool *pool;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(pool, &mem->pools, node) {
+		if (paddr >= pool->start && paddr < pool->end)
+			goto out;
+	}
+
+	list_for_each_entry_rcu(pool, &dev->dma_io_tlb_pools, node) {
+		if (paddr >= pool->start && paddr < pool->end)
+			goto out;
+	}
+	pool = NULL;
+out:
+	rcu_read_unlock();
+	return pool;
+}
+
+/**
+ * swiotlb_del_pool() - remove an IO TLB pool from a device
+ * @dev:	Owning device.
+ * @pool:	Memory pool to be removed.
+ */
+static void swiotlb_del_pool(struct device *dev, struct io_tlb_pool *pool)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->dma_io_tlb_lock, flags);
+	list_del_rcu(&pool->node);
+	spin_unlock_irqrestore(&dev->dma_io_tlb_lock, flags);
+
+	call_rcu(&pool->rcu, swiotlb_dyn_free);
+}
+
+#endif	/* CONFIG_SWIOTLB_DYNAMIC */
+
+/**
+ * swiotlb_dev_init() - initialize swiotlb fields in &struct device
+ * @dev:	Device to be initialized.
+ */
+void swiotlb_dev_init(struct device *dev)
+{
+	dev->dma_io_tlb_mem = &io_tlb_default_mem;
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+	INIT_LIST_HEAD(&dev->dma_io_tlb_pools);
+	spin_lock_init(&dev->dma_io_tlb_lock);
+	dev->dma_uses_io_tlb = false;
+#endif
+}
+
 /*
  * Return the offset into a iotlb slot required to keep the device happy.
  */
@@ -500,7 +826,7 @@ static unsigned int swiotlb_align_offset(struct device *dev, u64 addr)
 static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size,
 			   enum dma_data_direction dir)
 {
-	struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
+	struct io_tlb_pool *mem = swiotlb_find_pool(dev, tlb_addr);
 	int index = (tlb_addr - mem->start) >> IO_TLB_SHIFT;
 	phys_addr_t orig_addr = mem->slots[index].orig_addr;
 	size_t alloc_size = mem->slots[index].alloc_size;
@@ -577,12 +903,10 @@ static inline phys_addr_t slot_addr(phys_addr_t start, phys_addr_t idx)
  */
 static inline unsigned long get_max_slots(unsigned long boundary_mask)
 {
-	if (boundary_mask == ~0UL)
-		return 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);
-	return nr_slots(boundary_mask + 1);
+	return (boundary_mask >> IO_TLB_SHIFT) + 1;
 }
 
-static unsigned int wrap_area_index(struct io_tlb_mem *mem, unsigned int index)
+static unsigned int wrap_area_index(struct io_tlb_pool *mem, unsigned int index)
 {
 	if (index >= mem->area_nslabs)
 		return 0;
@@ -623,19 +947,30 @@ static void dec_used(struct io_tlb_mem *mem, unsigned int nslots)
 }
 #endif /* CONFIG_DEBUG_FS */
 
-/*
- * Find a suitable number of IO TLB entries size that will fit this request and
- * allocate a buffer from that IO TLB pool.
+/**
+ * swiotlb_area_find_slots() - search for slots in one IO TLB memory area
+ * @dev:	Device which maps the buffer.
+ * @pool:	Memory pool to be searched.
+ * @area_index:	Index of the IO TLB memory area to be searched.
+ * @orig_addr:	Original (non-bounced) IO buffer address.
+ * @alloc_size: Total requested size of the bounce buffer,
+ *		including initial alignment padding.
+ * @alloc_align_mask:	Required alignment of the allocated buffer.
+ *
+ * Find a suitable sequence of IO TLB entries for the request and allocate
+ * a buffer from the given IO TLB memory area.
+ * This function takes care of locking.
+ *
+ * Return: Index of the first allocated slot, or -1 on error.
  */
-static int swiotlb_do_find_slots(struct device *dev, int area_index,
-		phys_addr_t orig_addr, size_t alloc_size,
+static int swiotlb_area_find_slots(struct device *dev, struct io_tlb_pool *pool,
+		int area_index, phys_addr_t orig_addr, size_t alloc_size,
 		unsigned int alloc_align_mask)
 {
-	struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
-	struct io_tlb_area *area = mem->areas + area_index;
+	struct io_tlb_area *area = pool->areas + area_index;
 	unsigned long boundary_mask = dma_get_seg_boundary(dev);
 	dma_addr_t tbl_dma_addr =
-		phys_to_dma_unencrypted(dev, mem->start) & boundary_mask;
+		phys_to_dma_unencrypted(dev, pool->start) & boundary_mask;
 	unsigned long max_slots = get_max_slots(boundary_mask);
 	unsigned int iotlb_align_mask =
 		dma_get_min_align_mask(dev) | alloc_align_mask;
@@ -647,7 +982,7 @@ static int swiotlb_do_find_slots(struct device *dev, int area_index,
 	unsigned int slot_index;
 
 	BUG_ON(!nslots);
-	BUG_ON(area_index >= mem->nareas);
+	BUG_ON(area_index >= pool->nareas);
 
 	/*
 	 * For allocations of PAGE_SIZE or larger only look for page aligned
@@ -664,35 +999,30 @@ static int swiotlb_do_find_slots(struct device *dev, int area_index,
 	stride = (iotlb_align_mask >> IO_TLB_SHIFT) + 1;
 
 	spin_lock_irqsave(&area->lock, flags);
-	if (unlikely(nslots > mem->area_nslabs - area->used))
+	if (unlikely(nslots > pool->area_nslabs - area->used))
 		goto not_found;
 
-	slot_base = area_index * mem->area_nslabs;
+	slot_base = area_index * pool->area_nslabs;
 	index = area->index;
 
-	for (slots_checked = 0; slots_checked < mem->area_nslabs; ) {
+	for (slots_checked = 0; slots_checked < pool->area_nslabs; ) {
 		slot_index = slot_base + index;
 
 		if (orig_addr &&
 		    (slot_addr(tbl_dma_addr, slot_index) &
 		     iotlb_align_mask) != (orig_addr & iotlb_align_mask)) {
-			index = wrap_area_index(mem, index + 1);
+			index = wrap_area_index(pool, index + 1);
 			slots_checked++;
 			continue;
 		}
 
-		/*
-		 * If we find a slot that indicates we have 'nslots' number of
-		 * contiguous buffers, we allocate the buffers from that slot
-		 * and mark the entries as '0' indicating unavailable.
-		 */
 		if (!iommu_is_span_boundary(slot_index, nslots,
 					    nr_slots(tbl_dma_addr),
 					    max_slots)) {
-			if (mem->slots[slot_index].list >= nslots)
+			if (pool->slots[slot_index].list >= nslots)
 				goto found;
 		}
-		index = wrap_area_index(mem, index + stride);
+		index = wrap_area_index(pool, index + stride);
 		slots_checked += stride;
 	}
 
@@ -701,48 +1031,159 @@ not_found:
 	return -1;
 
 found:
+	/*
+	 * If we find a slot that indicates we have 'nslots' number of
+	 * contiguous buffers, we allocate the buffers from that slot onwards
+	 * and set the list of free entries to '0' indicating unavailable.
+	 */
 	for (i = slot_index; i < slot_index + nslots; i++) {
-		mem->slots[i].list = 0;
-		mem->slots[i].alloc_size = alloc_size - (offset +
+		pool->slots[i].list = 0;
+		pool->slots[i].alloc_size = alloc_size - (offset +
 				((i - slot_index) << IO_TLB_SHIFT));
 	}
 	for (i = slot_index - 1;
 	     io_tlb_offset(i) != IO_TLB_SEGSIZE - 1 &&
-	     mem->slots[i].list; i--)
-		mem->slots[i].list = ++count;
+	     pool->slots[i].list; i--)
+		pool->slots[i].list = ++count;
 
 	/*
 	 * Update the indices to avoid searching in the next round.
 	 */
-	area->index = wrap_area_index(mem, index + nslots);
+	area->index = wrap_area_index(pool, index + nslots);
 	area->used += nslots;
 	spin_unlock_irqrestore(&area->lock, flags);
 
-	inc_used_and_hiwater(mem, nslots);
+	inc_used_and_hiwater(dev->dma_io_tlb_mem, nslots);
 	return slot_index;
 }
 
-static int swiotlb_find_slots(struct device *dev, phys_addr_t orig_addr,
-		size_t alloc_size, unsigned int alloc_align_mask)
+/**
+ * swiotlb_pool_find_slots() - search for slots in one memory pool
+ * @dev:	Device which maps the buffer.
+ * @pool:	Memory pool to be searched.
+ * @orig_addr:	Original (non-bounced) IO buffer address.
+ * @alloc_size: Total requested size of the bounce buffer,
+ *		including initial alignment padding.
+ * @alloc_align_mask:	Required alignment of the allocated buffer.
+ *
+ * Search through one memory pool to find a sequence of slots that match the
+ * allocation constraints.
+ *
+ * Return: Index of the first allocated slot, or -1 on error.
+ */
+static int swiotlb_pool_find_slots(struct device *dev, struct io_tlb_pool *pool,
+		phys_addr_t orig_addr, size_t alloc_size,
+		unsigned int alloc_align_mask)
 {
-	struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
-	int start = raw_smp_processor_id() & (mem->nareas - 1);
+	int start = raw_smp_processor_id() & (pool->nareas - 1);
 	int i = start, index;
 
 	do {
-		index = swiotlb_do_find_slots(dev, i, orig_addr, alloc_size,
-					      alloc_align_mask);
+		index = swiotlb_area_find_slots(dev, pool, i, orig_addr,
+						alloc_size, alloc_align_mask);
 		if (index >= 0)
 			return index;
-		if (++i >= mem->nareas)
+		if (++i >= pool->nareas)
 			i = 0;
 	} while (i != start);
 
 	return -1;
 }
 
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+
+/**
+ * swiotlb_find_slots() - search for slots in the whole swiotlb
+ * @dev:	Device which maps the buffer.
+ * @orig_addr:	Original (non-bounced) IO buffer address.
+ * @alloc_size: Total requested size of the bounce buffer,
+ *		including initial alignment padding.
+ * @alloc_align_mask:	Required alignment of the allocated buffer.
+ * @retpool:	Used memory pool, updated on return.
+ *
+ * Search through the whole software IO TLB to find a sequence of slots that
+ * match the allocation constraints.
+ *
+ * Return: Index of the first allocated slot, or -1 on error.
+ */
+static int swiotlb_find_slots(struct device *dev, phys_addr_t orig_addr,
+		size_t alloc_size, unsigned int alloc_align_mask,
+		struct io_tlb_pool **retpool)
+{
+	struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
+	struct io_tlb_pool *pool;
+	unsigned long nslabs;
+	unsigned long flags;
+	u64 phys_limit;
+	int index;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(pool, &mem->pools, node) {
+		index = swiotlb_pool_find_slots(dev, pool, orig_addr,
+						alloc_size, alloc_align_mask);
+		if (index >= 0) {
+			rcu_read_unlock();
+			goto found;
+		}
+	}
+	rcu_read_unlock();
+	if (!mem->can_grow)
+		return -1;
+
+	schedule_work(&mem->dyn_alloc);
+
+	nslabs = nr_slots(alloc_size);
+	phys_limit = min_not_zero(*dev->dma_mask, dev->bus_dma_limit);
+	pool = swiotlb_alloc_pool(dev, nslabs, nslabs, 1, phys_limit,
+				  GFP_NOWAIT | __GFP_NOWARN);
+	if (!pool)
+		return -1;
+
+	index = swiotlb_pool_find_slots(dev, pool, orig_addr,
+					alloc_size, alloc_align_mask);
+	if (index < 0) {
+		swiotlb_dyn_free(&pool->rcu);
+		return -1;
+	}
+
+	pool->transient = true;
+	spin_lock_irqsave(&dev->dma_io_tlb_lock, flags);
+	list_add_rcu(&pool->node, &dev->dma_io_tlb_pools);
+	spin_unlock_irqrestore(&dev->dma_io_tlb_lock, flags);
+
+found:
+	dev->dma_uses_io_tlb = true;
+	/* Pairs with smp_rmb() in is_swiotlb_buffer() */
+	smp_wmb();
+
+	*retpool = pool;
+	return index;
+}
+
+#else  /* !CONFIG_SWIOTLB_DYNAMIC */
+
+static int swiotlb_find_slots(struct device *dev, phys_addr_t orig_addr,
+		size_t alloc_size, unsigned int alloc_align_mask,
+		struct io_tlb_pool **retpool)
+{
+	*retpool = &dev->dma_io_tlb_mem->defpool;
+	return swiotlb_pool_find_slots(dev, *retpool,
+				       orig_addr, alloc_size, alloc_align_mask);
+}
+
+#endif /* CONFIG_SWIOTLB_DYNAMIC */
+
 #ifdef CONFIG_DEBUG_FS
 
+/**
+ * mem_used() - get number of used slots in an allocator
+ * @mem:	Software IO TLB allocator.
+ *
+ * The result is accurate in this version of the function, because an atomic
+ * counter is available if CONFIG_DEBUG_FS is set.
+ *
+ * Return: Number of used slots.
+ */
 static unsigned long mem_used(struct io_tlb_mem *mem)
 {
 	return atomic_long_read(&mem->total_used);
@@ -750,14 +1191,48 @@ static unsigned long mem_used(struct io_tlb_mem *mem)
 
 #else /* !CONFIG_DEBUG_FS */
 
-static unsigned long mem_used(struct io_tlb_mem *mem)
+/**
+ * mem_pool_used() - get number of used slots in a memory pool
+ * @pool:	Software IO TLB memory pool.
+ *
+ * The result is not accurate, see mem_used().
+ *
+ * Return: Approximate number of used slots.
+ */
+static unsigned long mem_pool_used(struct io_tlb_pool *pool)
 {
 	int i;
 	unsigned long used = 0;
 
-	for (i = 0; i < mem->nareas; i++)
-		used += mem->areas[i].used;
+	for (i = 0; i < pool->nareas; i++)
+		used += pool->areas[i].used;
+	return used;
+}
+
+/**
+ * mem_used() - get number of used slots in an allocator
+ * @mem:	Software IO TLB allocator.
+ *
+ * The result is not accurate, because there is no locking of individual
+ * areas.
+ *
+ * Return: Approximate number of used slots.
+ */
+static unsigned long mem_used(struct io_tlb_mem *mem)
+{
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+	struct io_tlb_pool *pool;
+	unsigned long used = 0;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(pool, &mem->pools, node)
+		used += mem_pool_used(pool);
+	rcu_read_unlock();
+
 	return used;
+#else
+	return mem_pool_used(&mem->defpool);
+#endif
 }
 
 #endif /* CONFIG_DEBUG_FS */
@@ -769,6 +1244,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
 {
 	struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
 	unsigned int offset = swiotlb_align_offset(dev, orig_addr);
+	struct io_tlb_pool *pool;
 	unsigned int i;
 	int index;
 	phys_addr_t tlb_addr;
@@ -789,7 +1265,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
 	}
 
 	index = swiotlb_find_slots(dev, orig_addr,
-				   alloc_size + offset, alloc_align_mask);
+				   alloc_size + offset, alloc_align_mask, &pool);
 	if (index == -1) {
 		if (!(attrs & DMA_ATTR_NO_WARN))
 			dev_warn_ratelimited(dev,
@@ -804,8 +1280,8 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
 	 * needed.
 	 */
 	for (i = 0; i < nr_slots(alloc_size + offset); i++)
-		mem->slots[index + i].orig_addr = slot_addr(orig_addr, i);
-	tlb_addr = slot_addr(mem->start, index) + offset;
+		pool->slots[index + i].orig_addr = slot_addr(orig_addr, i);
+	tlb_addr = slot_addr(pool->start, index) + offset;
 	/*
 	 * When dir == DMA_FROM_DEVICE we could omit the copy from the orig
 	 * to the tlb buffer, if we knew for sure the device will
@@ -819,7 +1295,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
 
 static void swiotlb_release_slots(struct device *dev, phys_addr_t tlb_addr)
 {
-	struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
+	struct io_tlb_pool *mem = swiotlb_find_pool(dev, tlb_addr);
 	unsigned long flags;
 	unsigned int offset = swiotlb_align_offset(dev, tlb_addr);
 	int index = (tlb_addr - offset - mem->start) >> IO_TLB_SHIFT;
@@ -863,9 +1339,44 @@ static void swiotlb_release_slots(struct device *dev, phys_addr_t tlb_addr)
 	area->used -= nslots;
 	spin_unlock_irqrestore(&area->lock, flags);
 
-	dec_used(mem, nslots);
+	dec_used(dev->dma_io_tlb_mem, nslots);
+}
+
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+
+/**
+ * swiotlb_del_transient() - delete a transient memory pool
+ * @dev:	Device which mapped the buffer.
+ * @tlb_addr:	Physical address within a bounce buffer.
+ *
+ * Check whether the address belongs to a transient SWIOTLB memory pool.
+ * If yes, then delete the pool.
+ *
+ * Return: %true if @tlb_addr belonged to a transient pool that was released.
+ */
+static bool swiotlb_del_transient(struct device *dev, phys_addr_t tlb_addr)
+{
+	struct io_tlb_pool *pool;
+
+	pool = swiotlb_find_pool(dev, tlb_addr);
+	if (!pool->transient)
+		return false;
+
+	dec_used(dev->dma_io_tlb_mem, pool->nslabs);
+	swiotlb_del_pool(dev, pool);
+	return true;
 }
 
+#else  /* !CONFIG_SWIOTLB_DYNAMIC */
+
+static inline bool swiotlb_del_transient(struct device *dev,
+					 phys_addr_t tlb_addr)
+{
+	return false;
+}
+
+#endif	/* CONFIG_SWIOTLB_DYNAMIC */
+
 /*
  * tlb_addr is the physical address of the bounce buffer to unmap.
  */
@@ -880,6 +1391,8 @@ void swiotlb_tbl_unmap_single(struct device *dev, phys_addr_t tlb_addr,
 	    (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
 		swiotlb_bounce(dev, tlb_addr, mapping_size, DMA_FROM_DEVICE);
 
+	if (swiotlb_del_transient(dev, tlb_addr))
+		return;
 	swiotlb_release_slots(dev, tlb_addr);
 }
 
@@ -950,13 +1463,47 @@ size_t swiotlb_max_mapping_size(struct device *dev)
 	return ((size_t)IO_TLB_SIZE) * IO_TLB_SEGSIZE - min_align;
 }
 
+/**
+ * is_swiotlb_allocated() - check if the default software IO TLB is initialized
+ */
+bool is_swiotlb_allocated(void)
+{
+	return io_tlb_default_mem.nslabs;
+}
+
 bool is_swiotlb_active(struct device *dev)
 {
 	struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
 
 	return mem && mem->nslabs;
 }
-EXPORT_SYMBOL_GPL(is_swiotlb_active);
+
+/**
+ * default_swiotlb_base() - get the base address of the default SWIOTLB
+ *
+ * Get the lowest physical address used by the default software IO TLB pool.
+ */
+phys_addr_t default_swiotlb_base(void)
+{
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+	io_tlb_default_mem.can_grow = false;
+#endif
+	return io_tlb_default_mem.defpool.start;
+}
+
+/**
+ * default_swiotlb_limit() - get the address limit of the default SWIOTLB
+ *
+ * Get the highest physical address used by the default software IO TLB pool.
+ */
+phys_addr_t default_swiotlb_limit(void)
+{
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+	return io_tlb_default_mem.phys_limit;
+#else
+	return io_tlb_default_mem.defpool.end - 1;
+#endif
+}
 
 #ifdef CONFIG_DEBUG_FS
 
@@ -1031,17 +1578,18 @@ static inline void swiotlb_create_debugfs_files(struct io_tlb_mem *mem,
 struct page *swiotlb_alloc(struct device *dev, size_t size)
 {
 	struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
+	struct io_tlb_pool *pool;
 	phys_addr_t tlb_addr;
 	int index;
 
 	if (!mem)
 		return NULL;
 
-	index = swiotlb_find_slots(dev, 0, size, 0);
+	index = swiotlb_find_slots(dev, 0, size, 0, &pool);
 	if (index == -1)
 		return NULL;
 
-	tlb_addr = slot_addr(mem->start, index);
+	tlb_addr = slot_addr(pool->start, index);
 
 	return pfn_to_page(PFN_DOWN(tlb_addr));
 }
@@ -1078,29 +1626,37 @@ static int rmem_swiotlb_device_init(struct reserved_mem *rmem,
 	 * to it.
 	 */
 	if (!mem) {
+		struct io_tlb_pool *pool;
+
 		mem = kzalloc(sizeof(*mem), GFP_KERNEL);
 		if (!mem)
 			return -ENOMEM;
+		pool = &mem->defpool;
 
-		mem->slots = kcalloc(nslabs, sizeof(*mem->slots), GFP_KERNEL);
-		if (!mem->slots) {
+		pool->slots = kcalloc(nslabs, sizeof(*pool->slots), GFP_KERNEL);
+		if (!pool->slots) {
 			kfree(mem);
 			return -ENOMEM;
 		}
 
-		mem->areas = kcalloc(nareas, sizeof(*mem->areas),
+		pool->areas = kcalloc(nareas, sizeof(*pool->areas),
 				GFP_KERNEL);
-		if (!mem->areas) {
-			kfree(mem->slots);
+		if (!pool->areas) {
+			kfree(pool->slots);
 			kfree(mem);
 			return -ENOMEM;
 		}
 
 		set_memory_decrypted((unsigned long)phys_to_virt(rmem->base),
 				     rmem->size >> PAGE_SHIFT);
-		swiotlb_init_io_tlb_mem(mem, rmem->base, nslabs, SWIOTLB_FORCE,
-					false, nareas);
+		swiotlb_init_io_tlb_pool(pool, rmem->base, nslabs,
+					 false, nareas);
+		mem->force_bounce = true;
 		mem->for_alloc = true;
+#ifdef CONFIG_SWIOTLB_DYNAMIC
+		spin_lock_init(&mem->lock);
+#endif
+		add_mem_pool(mem, pool);
 
 		rmem->priv = mem;
 
diff --git a/mm/cma.c b/mm/cma.c
index 4880f72102fa98..da2967c6a22389 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -267,6 +267,9 @@ int __init cma_declare_contiguous_nid(phys_addr_t base,
 	if (alignment && !is_power_of_2(alignment))
 		return -EINVAL;
 
+	if (!IS_ENABLED(CONFIG_NUMA))
+		nid = NUMA_NO_NODE;
+
 	/* Sanitise input arguments. */
 	alignment = max_t(phys_addr_t, alignment, CMA_MIN_ALIGNMENT_BYTES);
 	if (fixed && base & (alignment - 1)) {
@@ -372,14 +375,15 @@ int __init cma_declare_contiguous_nid(phys_addr_t base,
 	if (ret)
 		goto free_mem;
 
-	pr_info("Reserved %ld MiB at %pa\n", (unsigned long)size / SZ_1M,
-		&base);
+	pr_info("Reserved %ld MiB at %pa on node %d\n", (unsigned long)size / SZ_1M,
+		&base, nid);
 	return 0;
 
 free_mem:
 	memblock_phys_free(base, size);
 err:
-	pr_err("Failed to reserve %ld MiB\n", (unsigned long)size / SZ_1M);
+	pr_err("Failed to reserve %ld MiB on node %d\n", (unsigned long)size / SZ_1M,
+	       nid);
 	return ret;
 }
 
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 01cdbf1224636a..cd71f9581e6722 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -895,10 +895,9 @@ void __init setup_kmalloc_cache_index_table(void)
 
 static unsigned int __kmalloc_minalign(void)
 {
-#ifdef CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC
-	if (io_tlb_default_mem.nslabs)
+	if (IS_ENABLED(CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC) &&
+	    is_swiotlb_allocated())
 		return ARCH_KMALLOC_MINALIGN;
-#endif
 	return dma_get_cache_alignment();
 }