[PATCH] tests/intel/xe_configfs: Skip ctx-restore subtests on SR-IOV VF

[Nitin Gote <nitin.r.gote@intel.com>]

The ctx-restore subtests use intel_register_read() via direct MMIO
(PCI BAR) access to verify that the batch buffer wrote the expected
register values. On SR-IOV Virtual Functions (VF), only a very limited
subset of registers is accessible. Registers like 0x4F100 are not
exposed to VFs, so the read always returns 0, causing a false test
failure.

Skip all ctx-restore subtests (post-bb, mid-bb, and their invalid
variants) when the device is running in SR-IOV VF mode.

v2: Use igt_skip_on_f instead of igt_require_f, reads better (Marcin)

Reviewed-by: Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com>
Signed-off-by: Nitin Gote <nitin.r.gote@intel.com>
---
 tests/intel/xe_configfs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tests/intel/xe_configfs.c b/tests/intel/xe_configfs.c
index 0db4af201..755524e7c 100644
--- a/tests/intel/xe_configfs.c
+++ b/tests/intel/xe_configfs.c
@@ -409,6 +409,7 @@ int igt_main()
 
 	igt_describe("Validate ctx_restore_post_bb with invalid options");
 	igt_subtest("ctx-restore-post-bb-invalid") {
+		igt_skip_on_f(is_vf_device, "MMIO register readback not possible on VF\n");
 		configfs_device_fd = create_device_configfs_group(configfs_fd);
 		test_ctx_restore_invalid(configfs_device_fd, "post");
 		close_configfs_group(configfs_fd, configfs_device_fd);
@@ -416,6 +417,7 @@ int igt_main()
 
 	igt_describe("Validate ctx_restore_post_bb");
 	igt_subtest("ctx-restore-post-bb") {
+		igt_skip_on_f(is_vf_device, "MMIO register readback not possible on VF\n");
 		configfs_device_fd = create_device_configfs_group(configfs_fd);
 		test_ctx_restore(configfs_device_fd, "post");
 		close_configfs_group(configfs_fd, configfs_device_fd);
@@ -423,6 +425,7 @@ int igt_main()
 
 	igt_describe("Validate ctx_restore_mid_bb with invalid options");
 	igt_subtest("ctx-restore-mid-bb-invalid") {
+		igt_skip_on_f(is_vf_device, "MMIO register readback not possible on VF\n");
 		configfs_device_fd = create_device_configfs_group(configfs_fd);
 		test_ctx_restore_invalid(configfs_device_fd, "mid");
 		close_configfs_group(configfs_fd, configfs_device_fd);
@@ -430,6 +433,7 @@ int igt_main()
 
 	igt_describe("Validate ctx_restore_mid_bb");
 	igt_subtest("ctx-restore-mid-bb") {
+		igt_skip_on_f(is_vf_device, "MMIO register readback not possible on VF\n");
 		configfs_device_fd = create_device_configfs_group(configfs_fd);
 		test_ctx_restore(configfs_device_fd, "mid");
 		close_configfs_group(configfs_fd, configfs_device_fd);
-- 
2.50.1