diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 4ada8b9749c9..bebc0804ff53 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -46,7 +46,9 @@ enum iommu_dma_cookie_type {
 struct dma_iommu_options {
 #define IOMMU_DMA_OPTS_PER_CPU_QUEUE	0L
 #define IOMMU_DMA_OPTS_SINGLE_QUEUE	BIT(0)
-	u64	flags;
+	u64		flags;
+	size_t		fq_size;
+	unsigned int	fq_timeout;
 };
 
 struct iommu_dma_cookie {
@@ -95,10 +97,12 @@ static int __init iommu_dma_forcedac_setup(char *str)
 early_param("iommu.forcedac", iommu_dma_forcedac_setup);
 
 /* Number of entries per flush queue */
-#define IOVA_FQ_SIZE	256
+#define IOVA_DEFAULT_FQ_SIZE	256
+#define IOVA_SINGLE_FQ_SIZE	32768
 
 /* Timeout (in ms) after which entries are flushed from the queue */
-#define IOVA_FQ_TIMEOUT	10
+#define IOVA_DEFAULT_FQ_TIMEOUT	10
+#define IOVA_SINGLE_FQ_TIMEOUT	1000
 
 /* Flush queue entry for deferred flushing */
 struct iova_fq_entry {
@@ -110,18 +114,19 @@ struct iova_fq_entry {
 
 /* Per-CPU flush queue structure */
 struct iova_fq {
-	struct iova_fq_entry entries[IOVA_FQ_SIZE];
-	unsigned int head, tail;
 	spinlock_t lock;
+	unsigned int head, tail;
+	unsigned int mod_mask;
+	struct iova_fq_entry entries[];
 };
 
 #define fq_ring_for_each(i, fq) \
-	for ((i) = (fq)->head; (i) != (fq)->tail; (i) = ((i) + 1) % IOVA_FQ_SIZE)
+	for ((i) = (fq)->head; (i) != (fq)->tail; (i) = ((i) + 1) & (fq)->mod_mask)
 
 static inline bool fq_full(struct iova_fq *fq)
 {
 	assert_spin_locked(&fq->lock);
-	return (((fq->tail + 1) % IOVA_FQ_SIZE) == fq->head);
+	return (((fq->tail + 1) & fq->mod_mask) == fq->head);
 }
 
 static inline unsigned int fq_ring_add(struct iova_fq *fq)
@@ -130,7 +135,7 @@ static inline unsigned int fq_ring_add(struct iova_fq *fq)
 
 	assert_spin_locked(&fq->lock);
 
-	fq->tail = (idx + 1) % IOVA_FQ_SIZE;
+	fq->tail = (idx + 1) & fq->mod_mask;
 
 	return idx;
 }
@@ -152,7 +157,7 @@ static void fq_ring_free_locked(struct iommu_dma_cookie *cookie, struct iova_fq
 			       fq->entries[idx].iova_pfn,
 			       fq->entries[idx].pages);
 
-		fq->head = (fq->head + 1) % IOVA_FQ_SIZE;
+		fq->head = (fq->head + 1) & fq->mod_mask;
 	}
 }
 
@@ -246,7 +251,7 @@ static void queue_iova(struct iommu_dma_cookie *cookie,
 	if (!atomic_read(&cookie->fq_timer_on) &&
 	    !atomic_xchg(&cookie->fq_timer_on, 1))
 		mod_timer(&cookie->fq_timer,
-			  jiffies + msecs_to_jiffies(IOVA_FQ_TIMEOUT));
+			  jiffies + msecs_to_jiffies(cookie->options.fq_timeout));
 }
 
 static void iommu_dma_free_fq_single(struct iova_fq *fq)
@@ -287,27 +292,29 @@ static void iommu_dma_free_fq(struct iommu_dma_cookie *cookie)
 		iommu_dma_free_fq_percpu(cookie->percpu_fq);
 }
 
-static void iommu_dma_init_one_fq(struct iova_fq *fq)
+static void iommu_dma_init_one_fq(struct iova_fq *fq, size_t fq_size)
 {
 	int i;
 
 	fq->head = 0;
 	fq->tail = 0;
+	fq->mod_mask = fq_size - 1;
 
 	spin_lock_init(&fq->lock);
 
-	for (i = 0; i < IOVA_FQ_SIZE; i++)
+	for (i = 0; i < fq_size; i++)
 		INIT_LIST_HEAD(&fq->entries[i].freelist);
 }
 
 static int iommu_dma_init_fq_single(struct iommu_dma_cookie *cookie)
 {
+	size_t fq_size = cookie->options.fq_size;
 	struct iova_fq *queue;
 
-	queue = vzalloc(sizeof(*queue));
+	queue = vzalloc(struct_size(queue, entries, fq_size));
 	if (!queue)
 		return -ENOMEM;
-	iommu_dma_init_one_fq(queue);
+	iommu_dma_init_one_fq(queue, fq_size);
 	cookie->single_fq = queue;
 
 	return 0;
@@ -315,15 +322,17 @@ static int iommu_dma_init_fq_single(struct iommu_dma_cookie *cookie)
 
 static int iommu_dma_init_fq_percpu(struct iommu_dma_cookie *cookie)
 {
+	size_t fq_size = cookie->options.fq_size;
 	struct iova_fq __percpu *queue;
 	int cpu;
 
-	queue = alloc_percpu(struct iova_fq);
+	queue = __alloc_percpu(struct_size(queue, entries, fq_size),
+			       __alignof__(*queue));
 	if (!queue)
 		return -ENOMEM;
 
 	for_each_possible_cpu(cpu)
-		iommu_dma_init_one_fq(per_cpu_ptr(queue, cpu));
+		iommu_dma_init_one_fq(per_cpu_ptr(queue, cpu), fq_size);
 	cookie->percpu_fq = queue;
 	return 0;
 }
@@ -377,6 +386,8 @@ static struct iommu_dma_cookie *cookie_alloc(enum iommu_dma_cookie_type type)
 		INIT_LIST_HEAD(&cookie->msi_page_list);
 		cookie->type = type;
 		cookie->options.flags = IOMMU_DMA_OPTS_PER_CPU_QUEUE;
+		cookie->options.fq_size = IOVA_DEFAULT_FQ_SIZE;
+		cookie->options.fq_timeout = IOVA_DEFAULT_FQ_TIMEOUT;
 	}
 	return cookie;
 }
@@ -696,14 +707,19 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
 
 	if (domain->type == IOMMU_DOMAIN_DMA_FQ) {
 		/* Expensive shadowing IOTLB flushes require some tuning */
-		if (dev->iommu->shadow_on_flush)
+		if (dev->iommu->shadow_on_flush) {
 			cookie->options.flags |= IOMMU_DMA_OPTS_SINGLE_QUEUE;
+			cookie->options.fq_timeout = IOVA_SINGLE_FQ_TIMEOUT;
+			cookie->options.fq_size = IOVA_SINGLE_FQ_SIZE;
+		}
 
 		/* If the FQ fails we can simply fall back to strict mode */
 		if (!device_iommu_capable(dev, IOMMU_CAP_DEFERRED_FLUSH) ||
 		    iommu_dma_init_fq(domain)) {
 			domain->type = IOMMU_DOMAIN_DMA;
 			cookie->options.flags &= ~IOMMU_DMA_OPTS_SINGLE_QUEUE;
+			cookie->options.fq_timeout = IOVA_DEFAULT_FQ_TIMEOUT;
+			cookie->options.fq_size = IOVA_DEFAULT_FQ_SIZE;
 		}
 	}
 
