iommufd/selftest: Fix tests to use MOCK_PAGE_SIZE based buffer sizes

JIRA: https://issues.redhat.com/browse/RHEL-40162
Upstream Status: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

commit ffa3c79
Author: Joao Martins <joao.m.martins@oracle.com>
Date:   Thu Jun 27 12:00:58 2024 +0100

    iommufd/selftest: Fix tests to use MOCK_PAGE_SIZE based buffer sizes

    commit a9af47e ("iommufd/selftest: Test IOMMU_HWPT_GET_DIRTY_BITMAP")
    added tests covering edge cases in the boundaries of iova bitmap. Although
    it used buffer sizes thinking in PAGE_SIZE (4K) as opposed to the
    MOCK_PAGE_SIZE (2K) that is used in iommufd mock selftests. This meant that
    isn't correctly exercising everything specifically the u32 and 4K bitmap
    test cases. Fix selftests buffer sizes to be based on mock page size.

    Link: https://lore.kernel.org/r/20240627110105.62325-5-joao.m.martins@oracle.com
    Reported-by: Kevin Tian <kevin.tian@intel.com>
    Closes: https://lore.kernel.org/linux-iommu/96efb6cf-a41c-420f-9673-2f0b682cac8c@oracle.com/
    Fixes: a9af47e ("iommufd/selftest: Test IOMMU_HWPT_GET_DIRTY_BITMAP")
    Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
    Reviewed-by: Kevin Tian <kevin.tian@intel.com>
    Tested-by: Matt Ochs <mochs@nvidia.com>
    Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

(cherry picked from commit ffa3c79)
Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com>

Author: snits

tools/testing/selftests/iommu/iommufd.c

@@ -1797,47 +1797,47 @@ FIXTURE_VARIANT_ADD(iommufd_dirty_tracking, domain_dirty16k)
 	.buffer_size = 16UL * 1024UL,
 };
 
-FIXTURE_VARIANT_ADD(iommufd_dirty_tracking, domain_dirty128k)
+FIXTURE_VARIANT_ADD(iommufd_dirty_tracking, domain_dirty64k)
 {
 	/* one u32 index bitmap */
-	.buffer_size = 128UL * 1024UL,
+	.buffer_size = 64UL * 1024UL,
 };
 
-FIXTURE_VARIANT_ADD(iommufd_dirty_tracking, domain_dirty256k)
+FIXTURE_VARIANT_ADD(iommufd_dirty_tracking, domain_dirty128k)
 {
 	/* one u64 index bitmap */
-	.buffer_size = 256UL * 1024UL,
+	.buffer_size = 128UL * 1024UL,
 };
 
-FIXTURE_VARIANT_ADD(iommufd_dirty_tracking, domain_dirty640k)
+FIXTURE_VARIANT_ADD(iommufd_dirty_tracking, domain_dirty320k)
 {
 	/* two u64 index and trailing end bitmap */
-	.buffer_size = 640UL * 1024UL,
+	.buffer_size = 320UL * 1024UL,
 };
 
-FIXTURE_VARIANT_ADD(iommufd_dirty_tracking, domain_dirty128M)
+FIXTURE_VARIANT_ADD(iommufd_dirty_tracking, domain_dirty64M)
 {
-	/* 4K bitmap (128M IOVA range) */
-	.buffer_size = 128UL * 1024UL * 1024UL,
+	/* 4K bitmap (64M IOVA range) */
+	.buffer_size = 64UL * 1024UL * 1024UL,
 };
 
-FIXTURE_VARIANT_ADD(iommufd_dirty_tracking, domain_dirty128M_huge)
+FIXTURE_VARIANT_ADD(iommufd_dirty_tracking, domain_dirty64M_huge)
 {
-	/* 4K bitmap (128M IOVA range) */
-	.buffer_size = 128UL * 1024UL * 1024UL,
+	/* 4K bitmap (64M IOVA range) */
+	.buffer_size = 64UL * 1024UL * 1024UL,
 	.hugepages = true,
 };
 
-FIXTURE_VARIANT_ADD(iommufd_dirty_tracking, domain_dirty256M)
+FIXTURE_VARIANT_ADD(iommufd_dirty_tracking, domain_dirty128M)
 {
-	/* 8K bitmap (256M IOVA range) */
-	.buffer_size = 256UL * 1024UL * 1024UL,
+	/* 8K bitmap (128M IOVA range) */
+	.buffer_size = 128UL * 1024UL * 1024UL,
 };
 
-FIXTURE_VARIANT_ADD(iommufd_dirty_tracking, domain_dirty256M_huge)
+FIXTURE_VARIANT_ADD(iommufd_dirty_tracking, domain_dirty128M_huge)
 {
-	/* 8K bitmap (256M IOVA range) */
-	.buffer_size = 256UL * 1024UL * 1024UL,
+	/* 8K bitmap (128M IOVA range) */
+	.buffer_size = 128UL * 1024UL * 1024UL,
 	.hugepages = true,
 };