vfio: powerpc/spapr: Use it_page_size

This makes use of the it_page_size from the iommu_table struct
as page size can differ.

This replaces missing IOMMU_PAGE_SHIFT macro in commented debug code
as recently introduced IOMMU_PAGE_XXX macros do not include
IOMMU_PAGE_SHIFT.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
[aw: for the vfio related changes]
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

drivers/vfio/vfio_iommu_spapr_tce.c

@@ -91,7 +91,7 @@ static int tce_iommu_enable(struct tce_container *container)
 	 * enforcing the limit based on the max that the guest can map.
 	 */
 	down_write(&current->mm->mmap_sem);
-	npages = (tbl->it_size << IOMMU_PAGE_SHIFT_4K) >> PAGE_SHIFT;
+	npages = (tbl->it_size << tbl->it_page_shift) >> PAGE_SHIFT;
 	locked = current->mm->locked_vm + npages;
 	lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
 	if (locked > lock_limit && !capable(CAP_IPC_LOCK)) {
@@ -120,7 +120,7 @@ static void tce_iommu_disable(struct tce_container *container)
 
 	down_write(&current->mm->mmap_sem);
 	current->mm->locked_vm -= (container->tbl->it_size <<
-			IOMMU_PAGE_SHIFT_4K) >> PAGE_SHIFT;
+			container->tbl->it_page_shift) >> PAGE_SHIFT;
 	up_write(&current->mm->mmap_sem);
 }
 
@@ -215,7 +215,7 @@ static long tce_iommu_build(struct tce_container *container,
 					tce, ret);
 			break;
 		}
-		tce += IOMMU_PAGE_SIZE_4K;
+		tce += IOMMU_PAGE_SIZE(tbl);
 	}
 
 	if (ret)
@@ -260,8 +260,8 @@ static long tce_iommu_ioctl(void *iommu_data,
 		if (info.argsz < minsz)
 			return -EINVAL;
 
-		info.dma32_window_start = tbl->it_offset << IOMMU_PAGE_SHIFT_4K;
-		info.dma32_window_size = tbl->it_size << IOMMU_PAGE_SHIFT_4K;
+		info.dma32_window_start = tbl->it_offset << tbl->it_page_shift;
+		info.dma32_window_size = tbl->it_size << tbl->it_page_shift;
 		info.flags = 0;
 
 		if (copy_to_user((void __user *)arg, &info, minsz))
@@ -291,8 +291,8 @@ static long tce_iommu_ioctl(void *iommu_data,
 				VFIO_DMA_MAP_FLAG_WRITE))
 			return -EINVAL;
 
-		if ((param.size & ~IOMMU_PAGE_MASK_4K) ||
-				(param.vaddr & ~IOMMU_PAGE_MASK_4K))
+		if ((param.size & ~IOMMU_PAGE_MASK(tbl)) ||
+				(param.vaddr & ~IOMMU_PAGE_MASK(tbl)))
 			return -EINVAL;
 
 		/* iova is checked by the IOMMU API */
@@ -307,8 +307,8 @@ static long tce_iommu_ioctl(void *iommu_data,
 			return ret;
 
 		ret = tce_iommu_build(container, tbl,
-				param.iova >> IOMMU_PAGE_SHIFT_4K,
-				tce, param.size >> IOMMU_PAGE_SHIFT_4K);
+				param.iova >> tbl->it_page_shift,
+				tce, param.size >> tbl->it_page_shift);
 
 		iommu_flush_tce(tbl);
 
@@ -334,17 +334,17 @@ static long tce_iommu_ioctl(void *iommu_data,
 		if (param.flags)
 			return -EINVAL;
 
-		if (param.size & ~IOMMU_PAGE_MASK_4K)
+		if (param.size & ~IOMMU_PAGE_MASK(tbl))
 			return -EINVAL;
 
 		ret = iommu_tce_clear_param_check(tbl, param.iova, 0,
-				param.size >> IOMMU_PAGE_SHIFT_4K);
+				param.size >> tbl->it_page_shift);
 		if (ret)
 			return ret;
 
 		ret = tce_iommu_clear(container, tbl,
-				param.iova >> IOMMU_PAGE_SHIFT_4K,
-				param.size >> IOMMU_PAGE_SHIFT_4K);
+				param.iova >> tbl->it_page_shift,
+				param.size >> tbl->it_page_shift);
 		iommu_flush_tce(tbl);
 
 		return ret;