[v4,18/23] iommu/riscv: Update to use iommu_alloc_pages_node_lg2()

Commit Message

Jason Gunthorpe April 8, 2025, 4:54 p.m. UTC

One part of RISCV already has a computed size, however the queue
allocation must be aligned to 4k. The other objects are 4k by spec.

Reviewed-by: Tomasz Jeznach <[e-mail]>
Signed-off-by: Jason Gunthorpe <[e-mail]>
---
 drivers/iommu/riscv/iommu.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

Patch

diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c
index 2750f2e6e01a2b..8835c82f118db4 100644
--- a/drivers/iommu/riscv/iommu.c
+++ b/drivers/iommu/riscv/iommu.c
@@ -65,13 +65,14 @@  static int riscv_iommu_devres_pages_match(struct device *dev, void *res, void *p
 	return devres->addr == target->addr;
 }
 
-static void *riscv_iommu_get_pages(struct riscv_iommu_device *iommu, int order)
+static void *riscv_iommu_get_pages(struct riscv_iommu_device *iommu,
+				   unsigned int size)
 {
 	struct riscv_iommu_devres *devres;
 	void *addr;
 
-	addr = iommu_alloc_pages_node(dev_to_node(iommu->dev),
-				      GFP_KERNEL_ACCOUNT, order);
+	addr = iommu_alloc_pages_node_sz(dev_to_node(iommu->dev),
+					 GFP_KERNEL_ACCOUNT, size);
 	if (unlikely(!addr))
 		return NULL;
 
@@ -161,9 +162,9 @@  static int riscv_iommu_queue_alloc(struct riscv_iommu_device *iommu,
 	} else {
 		do {
 			const size_t queue_size = entry_size << (logsz + 1);
-			const int order = get_order(queue_size);
 
-			queue->base = riscv_iommu_get_pages(iommu, order);
+			queue->base = riscv_iommu_get_pages(
+				iommu, max(queue_size, SZ_4K));
 			queue->phys = __pa(queue->base);
 		} while (!queue->base && logsz-- > 0);
 	}
@@ -618,7 +619,7 @@  static struct riscv_iommu_dc *riscv_iommu_get_dc(struct riscv_iommu_device *iomm
 				break;
 			}
 
-			ptr = riscv_iommu_get_pages(iommu, 0);
+			ptr = riscv_iommu_get_pages(iommu, SZ_4K);
 			if (!ptr)
 				return NULL;
 
@@ -698,7 +699,7 @@  static int riscv_iommu_iodir_alloc(struct riscv_iommu_device *iommu)
 	}
 
 	if (!iommu->ddt_root) {
-		iommu->ddt_root = riscv_iommu_get_pages(iommu, 0);
+		iommu->ddt_root = riscv_iommu_get_pages(iommu, SZ_4K);
 		iommu->ddt_phys = __pa(iommu->ddt_root);
 	}