On 1970/1/1 8:00, Marco Pagani wrote:
> The suite tests the basic behaviors of the FPGA Region including
> the programming and the function for finding a specific region.
>
> Signed-off-by: Marco Pagani <marpagan@xxxxxxxxxx>
> Acked-by: Xu Yilun <yilun.xu@xxxxxxxxx>
> ---
> drivers/fpga/tests/fpga-region-test.c | 211 ++++++++++++++++++++++++++
> 1 file changed, 211 insertions(+)
> create mode 100644 drivers/fpga/tests/fpga-region-test.c
>
> diff --git a/drivers/fpga/tests/fpga-region-test.c b/drivers/fpga/tests/fpga-region-test.c
> new file mode 100644
> index 000000000000..9f9d50ee7871
> --- /dev/null
> +++ b/drivers/fpga/tests/fpga-region-test.c
> @@ -0,0 +1,211 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * KUnit test for the FPGA Region
> + *
> + * Copyright (C) 2023 Red Hat, Inc.
> + *
> + * Author: Marco Pagani <marpagan@xxxxxxxxxx>
> + */
> +
> +#include <kunit/test.h>
> +#include <linux/fpga/fpga-bridge.h>
> +#include <linux/fpga/fpga-mgr.h>
> +#include <linux/fpga/fpga-region.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/types.h>
> +
> +struct mgr_stats {
> + u32 write_count;
> +};
> +
> +struct bridge_stats {
> + bool enable;
> + u32 cycles_count;
> +};
> +
> +struct test_ctx {
> + struct fpga_manager *mgr;
> + struct platform_device *mgr_pdev;
> + struct fpga_bridge *bridge;
> + struct platform_device *bridge_pdev;
> + struct fpga_region *region;
> + struct platform_device *region_pdev;
> + struct bridge_stats bridge_stats;
> + struct mgr_stats mgr_stats;
> +};
> +
> +static int op_write(struct fpga_manager *mgr, const char *buf, size_t count)
> +{
> + struct mgr_stats *stats = mgr->priv;
> +
> + stats->write_count++;
> +
> + return 0;
> +}
> +
> +/*
> + * Fake FPGA manager that implements only the write op to count the number
> + * of programming cycles. The internals of the programming sequence are
> + * tested in the Manager suite since they are outside the responsibility
> + * of the Region.
> + */
> +static const struct fpga_manager_ops fake_mgr_ops = {
> + .write = op_write,
> +};
> +
> +static int op_enable_set(struct fpga_bridge *bridge, bool enable)
> +{
> + struct bridge_stats *stats = bridge->priv;
> +
> + if (!stats->enable && enable)
> + stats->cycles_count++;
> +
> + stats->enable = enable;
> +
> + return 0;
> +}
> +
> +/*
> + * Fake FPGA bridge that implements only enable_set op to count the number
> + * of activation cycles.
> + */
> +static const struct fpga_bridge_ops fake_bridge_ops = {
> + .enable_set = op_enable_set,
> +};
> +
> +static int fake_region_get_bridges(struct fpga_region *region)
> +{
> + struct fpga_bridge *bridge = region->priv;
> +
> + return fpga_bridge_get_to_list(bridge->dev.parent, region->info, ®ion->bridge_list);
> +}
> +
> +static int fake_region_match(struct device *dev, const void *data)
> +{
> + return dev->parent == data;
> +}
> +
> +static void fpga_region_test_class_find(struct kunit *test)
> +{
> + struct test_ctx *ctx = test->priv;
> + struct fpga_region *region;
> +
> + region = fpga_region_class_find(NULL, &ctx->region_pdev->dev, fake_region_match);
> + KUNIT_EXPECT_PTR_EQ(test, region, ctx->region);
> +}
> +
> +/*
> + * FPGA Region programming test. The Region must call get_bridges() to get
> + * and control the bridges, and then the Manager for the actual programming.
> + */
> +static void fpga_region_test_program_fpga(struct kunit *test)
> +{
> + struct test_ctx *ctx = test->priv;
> + struct fpga_image_info *img_info;
> + char img_buf[4];
> + int ret;
> +
> + img_info = fpga_image_info_alloc(&ctx->mgr_pdev->dev);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, img_info);
> +
> + img_info->buf = img_buf;
> + img_info->count = sizeof(img_buf);
> +
> + ctx->region->info = img_info;
> + ret = fpga_region_program_fpga(ctx->region);
modprobe fpga-region-test and the below null-ptr-deref occurs.It seems
that ctx->region->dev is NULL and the region->dev need
to be assigned.
general protection fault, probably for non-canonical address
0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 3 PID: 1887 Comm: kunit_try_catch Tainted: G N
6.6.0-rc2+ #49
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.15.0-1 04/01/2014
RIP: 0010:fpga_region_program_fpga+0xfb/0x390 [fpga_region]
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 73 02 00 00 48 b8 00
00 00 00 00 fc ff df 48 8b 5b 68 48 8d 7b 10 48 89 fa 48 c1 ea 03 <80>
3c 02 00 0f 85 5a 02 00 00 48 8b 7b 10 e8 62 df 14 e1 84 c0 0f
RSP: 0018:ffff88810f6b7db0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff83f6a490
RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000010
RBP: ffff888108b99000 R08: 0000000000000001 R09: ffffed1021173207
R10: ffff888108b9903b R11: ffff88810f6b7a18 R12: ffff888108b992e0
R13: ffff888106d28828 R14: ffff888108b99000 R15: ffff888106d28828
FS: 0000000000000000(0000) GS:ffff888119d80000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faa013c1000 CR3: 000000010d6e5005 CR4: 0000000000770ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
<TASK>
? die_addr+0x3d/0xa0
? exc_general_protection+0x144/0x220
? asm_exc_general_protection+0x22/0x30
? kobject_get+0x50/0xe0
? fpga_region_program_fpga+0xfb/0x390 [fpga_region]
fpga_region_test_program_fpga+0x17e/0x580 [fpga_region_test]
? fake_region_match+0x50/0x50 [fpga_region_test]
? try_to_wake_up+0x151/0x13e0
? fpga_region_test_exit+0x130/0x130 [fpga_region_test]
? __sched_text_end+0xa/0xa
? kunit_try_run_case_cleanup+0xe0/0xe0
kunit_generic_run_threadfn_adapter+0x4a/0x90
? kunit_try_catch_throw+0x80/0x80
kthread+0x2b5/0x380
? kthread_complete_and_exit+0x20/0x20
ret_from_fork+0x2d/0x70
? kthread_complete_and_exit+0x20/0x20
ret_from_fork_asm+0x11/0x20
</TASK>
Modules linked in: fpga_region_test(+) fpga_region fpga_bridge fpga_mgr
Dumping ftrace buffer:
(ftrace buffer empty)
---[ end trace 0000000000000000 ]---
RIP: 0010:fpga_region_program_fpga+0xfb/0x390 [fpga_region]
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 73 02 00 00 48 b8 00
00 00 00 00 fc ff df 48 8b 5b 68 48 8d 7b 10 48 89 fa 48 c1 ea 03 <80>
3c 02 00 0f 85 5a 02 00 00 48 8b 7b 10 e8 62 df 14 e1 84 c0 0f
RSP: 0018:ffff88810f6b7db0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff83f6a490
RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000010
RBP: ffff888108b99000 R08: 0000000000000001 R09: ffffed1021173207
R10: ffff888108b9903b R11: ffff88810f6b7a18 R12: ffff888108b992e0
R13: ffff888106d28828 R14: ffff888108b99000 R15: ffff888106d28828
FS: 0000000000000000(0000) GS:ffff888119d80000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faa013c1000 CR3: 000000010d6e5005 CR4: 0000000000770ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 1 seconds..
Fixes: 64a5f972c93d ("fpga: add an initial KUnit suite for the FPGA
Region")
Reported-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + KUNIT_EXPECT_EQ(test, 1, ctx->mgr_stats.write_count);
> + KUNIT_EXPECT_EQ(test, 1, ctx->bridge_stats.cycles_count);
> +
> + fpga_bridges_put(&ctx->region->bridge_list);
> +
> + ret = fpga_region_program_fpga(ctx->region);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + KUNIT_EXPECT_EQ(test, 2, ctx->mgr_stats.write_count);
> + KUNIT_EXPECT_EQ(test, 2, ctx->bridge_stats.cycles_count);
> +
> + fpga_bridges_put(&ctx->region->bridge_list);
> +
> + fpga_image_info_free(img_info);
> +}
> +
> +/*
> + * The configuration used in this test suite uses a single bridge to
> + * limit the code under test to a single unit. The functions used by the
> + * Region for getting and controlling bridges are tested (with a list of
> + * multiple bridges) in the Bridge suite.
> + */
> +static int fpga_region_test_init(struct kunit *test)
> +{
> + struct test_ctx *ctx;
> + struct fpga_region_info region_info = { 0 };
> +
> + ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
> +
> + ctx->mgr_pdev = platform_device_register_simple("mgr_pdev", PLATFORM_DEVID_AUTO, NULL, 0);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->mgr_pdev);
> +
> + ctx->mgr = devm_fpga_mgr_register(&ctx->mgr_pdev->dev, "Fake FPGA Manager", &fake_mgr_ops,
> + &ctx->mgr_stats);
> + KUNIT_ASSERT_FALSE(test, IS_ERR_OR_NULL(ctx->mgr));
> +
> + ctx->bridge_pdev = platform_device_register_simple("bridge_pdev", PLATFORM_DEVID_AUTO,
> + NULL, 0);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->bridge_pdev);
> +
> + ctx->bridge = fpga_bridge_register(&ctx->bridge_pdev->dev, "Fake FPGA Bridge",
> + &fake_bridge_ops, &ctx->bridge_stats);
> + KUNIT_ASSERT_FALSE(test, IS_ERR_OR_NULL(ctx->bridge));
> +
> + ctx->bridge_stats.enable = true;
> +
> + ctx->region_pdev = platform_device_register_simple("region_pdev", PLATFORM_DEVID_AUTO,
> + NULL, 0);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->region_pdev);
> +
> + region_info.mgr = ctx->mgr;
> + region_info.priv = ctx->bridge;
> + region_info.get_bridges = fake_region_get_bridges;
> +
> + ctx->region = fpga_region_register_full(&ctx->region_pdev->dev, ®ion_info);
> + KUNIT_ASSERT_FALSE(test, IS_ERR_OR_NULL(ctx->region));
> +
> + test->priv = ctx;
> +
> + return 0;
> +}
> +
> +static void fpga_region_test_exit(struct kunit *test)
> +{
> + struct test_ctx *ctx = test->priv;
> +
> + fpga_region_unregister(ctx->region);
> + platform_device_unregister(ctx->region_pdev);
> +
> + fpga_bridge_unregister(ctx->bridge);
> + platform_device_unregister(ctx->bridge_pdev);
> +
> + platform_device_unregister(ctx->mgr_pdev);
> +}
> +
> +static struct kunit_case fpga_region_test_cases[] = {
> + KUNIT_CASE(fpga_region_test_class_find),
> + KUNIT_CASE(fpga_region_test_program_fpga),
> +
> + {}
> +};
> +
> +static struct kunit_suite fpga_region_suite = {
> + .name = "fpga_mgr",
> + .init = fpga_region_test_init,
> + .exit = fpga_region_test_exit,
> + .test_cases = fpga_region_test_cases,
> +};
> +
> +kunit_test_suite(fpga_region_suite);
> +
> +MODULE_LICENSE("GPL");
