On 2/3/23 09:06, Marco Pagani wrote:
> Introduce an initial KUnit suite to test the core components of the
> FPGA subsystem.
>
> The test suite consists of two test cases. The first test case checks
> the programming of a static image on a fake FPGA with a single hardware
> bridge. The FPGA is first programmed using a test image stored in a
> buffer, and then with the same image linked to a single-entry
> scatter-gather list.
>
> The second test case models dynamic partial reconfiguration. The FPGA
> is first configured with a static image that implements a
> reconfigurable design containing a sub-region controlled by two soft
> bridges. Then, the reconfigurable sub-region is reconfigured using
> a fake partial bitstream image. After the reconfiguration, the test
> checks that the soft bridges have been correctly activated.
>
> Signed-off-by: Marco Pagani <marpagan@xxxxxxxxxx>
> ---
> drivers/fpga/Kconfig | 2 +
> drivers/fpga/Makefile | 3 +
> drivers/fpga/tests/.kunitconfig | 5 +
> drivers/fpga/tests/Kconfig | 15 ++
> drivers/fpga/tests/Makefile | 6 +
> drivers/fpga/tests/fpga-tests.c | 264 ++++++++++++++++++++++++++++++++
> 6 files changed, 295 insertions(+)
> create mode 100644 drivers/fpga/tests/.kunitconfig
> create mode 100644 drivers/fpga/tests/Kconfig
> create mode 100644 drivers/fpga/tests/Makefile
> create mode 100644 drivers/fpga/tests/fpga-tests.c
>
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index 0a00763b9f28..2f689ac4ba3a 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -276,4 +276,6 @@ config FPGA_MGR_LATTICE_SYSCONFIG_SPI
> FPGA manager driver support for Lattice FPGAs programming over slave
> SPI sysCONFIG interface.
>
> +source "drivers/fpga/tests/Kconfig"
> +
> endif # FPGA
> diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
> index 72e554b4d2f7..352a2612623e 100644
> --- a/drivers/fpga/Makefile
> +++ b/drivers/fpga/Makefile
> @@ -55,3 +55,6 @@ obj-$(CONFIG_FPGA_DFL_NIOS_INTEL_PAC_N3000) += dfl-n3000-nios.o
>
> # Drivers for FPGAs which implement DFL
> obj-$(CONFIG_FPGA_DFL_PCI) += dfl-pci.o
> +
> +# KUnit tests
> +obj-$(CONFIG_FPGA_KUNIT_TESTS) += tests/
> diff --git a/drivers/fpga/tests/.kunitconfig b/drivers/fpga/tests/.kunitconfig
> new file mode 100644
> index 000000000000..a1c2a2974c39
> --- /dev/null
> +++ b/drivers/fpga/tests/.kunitconfig
> @@ -0,0 +1,5 @@
> +CONFIG_KUNIT=y
> +CONFIG_FPGA=y
> +CONFIG_FPGA_REGION=y
> +CONFIG_FPGA_BRIDGE=y
> +CONFIG_FPGA_KUNIT_TESTS=y
> diff --git a/drivers/fpga/tests/Kconfig b/drivers/fpga/tests/Kconfig
> new file mode 100644
> index 000000000000..5198e605b38d
> --- /dev/null
> +++ b/drivers/fpga/tests/Kconfig
> @@ -0,0 +1,15 @@
> +config FPGA_KUNIT_TESTS
> + tristate "FPGA KUnit tests" if !KUNIT_ALL_TESTS
> + depends on FPGA && FPGA_REGION && FPGA_BRIDGE && KUNIT
> + default KUNIT_ALL_TESTS
> + help
> + Builds unit tests for the FPGA subsystem. This option
> + is not useful for distributions or general kernels,
> + but only for kernel developers working on the FPGA
> + subsystem and its associated drivers.
> +
> + For more information on KUnit and unit tests in general,
> + please refer to the KUnit documentation in
> + Documentation/dev-tools/kunit/.
> +
> + If in doubt, say "N".
> diff --git a/drivers/fpga/tests/Makefile b/drivers/fpga/tests/Makefile
> new file mode 100644
> index 000000000000..74346ae62457
> --- /dev/null
> +++ b/drivers/fpga/tests/Makefile
> @@ -0,0 +1,6 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +obj-$(CONFIG_FPGA_KUNIT_TESTS) += fake-fpga-mgr.o
> +obj-$(CONFIG_FPGA_KUNIT_TESTS) += fake-fpga-region.o
> +obj-$(CONFIG_FPGA_KUNIT_TESTS) += fake-fpga-bridge.o
> +obj-$(CONFIG_FPGA_KUNIT_TESTS) += fpga-tests.o
> diff --git a/drivers/fpga/tests/fpga-tests.c b/drivers/fpga/tests/fpga-tests.c
> new file mode 100644
> index 000000000000..33f04079b32f
> --- /dev/null
> +++ b/drivers/fpga/tests/fpga-tests.c
> @@ -0,0 +1,264 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Test suite for the FPGA subsystem
> + *
> + * Copyright (C) 2023 Red Hat, Inc. All rights reserved.
> + *
> + * Author: Marco Pagani <marpagan@xxxxxxxxxx>
> + */
> +
> +#include <kunit/test.h>
> +#include <linux/platform_device.h>
> +#include <linux/scatterlist.h>
> +
> +#include <linux/fpga/fpga-mgr.h>
> +#include <linux/fpga/fpga-region.h>
> +#include <linux/fpga/fpga-bridge.h>
> +
> +#include "fake-fpga-region.h"
> +#include "fake-fpga-bridge.h"
> +#include "fake-fpga-mgr.h"
> +
> +#define FAKE_BIT_BLOCKS 16
> +#define FAKE_BIT_SIZE (FPGA_TEST_BIT_BLOCK * FAKE_BIT_BLOCKS)
> +
> +static u8 fake_bit[FAKE_BIT_SIZE];
I take it "bit" in fake_bit and sgt_bit is short for "bitstream". Initially,
I found this confusing as I tend to think of a bit as a single bit. It might
be better to expand that something like "fake_bitstream" or "fake_image".
- Russ
> +
> +static int init_sgt_bit(struct sg_table *sgt, void *bit, size_t len)
> +{
> + int ret;
> +
> + ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
> + if (ret)
> + return ret;
> +
> + sg_init_one(sgt->sgl, bit, len);
> +
> + return ret;
> +}
> +
> +static void free_sgt_bit(struct sg_table *sgt)
> +{
> + if (sgt)
> + sg_free_table(sgt);
> +}
> +
> +static void fpga_build_base_sys(struct kunit *test, struct fake_fpga_mgr *mgr_ctx,
> + struct fake_fpga_bridge *bridge_ctx,
> + struct fake_fpga_region *region_ctx)
> +{
> + int ret;
> +
> + ret = fake_fpga_mgr_register(mgr_ctx, test);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + ret = fake_fpga_bridge_register(bridge_ctx, test);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + ret = fake_fpga_region_register(region_ctx, mgr_ctx->mgr, test);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + ret = fake_fpga_region_add_bridge(region_ctx, bridge_ctx->bridge);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +}
> +
> +static void fpga_free_base_sys(struct fake_fpga_mgr *mgr_ctx,
> + struct fake_fpga_bridge *bridge_ctx,
> + struct fake_fpga_region *region_ctx)
> +{
> + if (region_ctx)
> + fake_fpga_region_unregister(region_ctx);
> +
> + if (bridge_ctx)
> + fake_fpga_bridge_unregister(bridge_ctx);
> +
> + if (region_ctx)
> + fake_fpga_mgr_unregister(mgr_ctx);
> +}
> +
> +static int fpga_suite_init(struct kunit_suite *suite)
> +{
> + fake_fpga_mgr_fill_header(fake_bit);
> +
> + return 0;
> +}
> +
> +static void fpga_base_test(struct kunit *test)
> +{
> + int ret;
> +
> + struct fake_fpga_mgr mgr_ctx;
> + struct fake_fpga_bridge base_bridge_ctx;
> + struct fake_fpga_region base_region_ctx;
> +
> + struct fpga_image_info *test_img_info;
> +
> + struct sg_table sgt_bit;
> +
> + fpga_build_base_sys(test, &mgr_ctx, &base_bridge_ctx, &base_region_ctx);
> +
> + /* Allocate a fake test image using a buffer */
> + test_img_info = fpga_image_info_alloc(&mgr_ctx.pdev->dev);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, test_img_info);
> +
> + test_img_info->buf = fake_bit;
> + test_img_info->count = sizeof(fake_bit);
> +
> + kunit_info(test, "fake bitstream size: %zu\n", test_img_info->count);
> +
> + KUNIT_EXPECT_EQ(test, 0, fake_fpga_mgr_get_rcfg_count(&mgr_ctx));
> +
> + KUNIT_EXPECT_EQ(test, 0, fake_fpga_bridge_get_state(&base_bridge_ctx));
> + KUNIT_EXPECT_EQ(test, 0, fake_fpga_bridge_get_cycles_count(&base_bridge_ctx));
> +
> + /* Program the fake FPGA using the image buffer */
> + base_region_ctx.region->info = test_img_info;
> + ret = fpga_region_program_fpga(base_region_ctx.region);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + fake_fpga_mgr_check_write_buf(&mgr_ctx);
> +
> + KUNIT_EXPECT_EQ(test, 1, fake_fpga_mgr_get_rcfg_count(&mgr_ctx));
> +
> + KUNIT_EXPECT_EQ(test, 1, fake_fpga_bridge_get_state(&base_bridge_ctx));
> + KUNIT_EXPECT_EQ(test, 1, fake_fpga_bridge_get_cycles_count(&base_bridge_ctx));
> +
> + fpga_image_info_free(test_img_info);
> +
> + /* Allocate another fake test image using a scatter list */
> + test_img_info = fpga_image_info_alloc(&mgr_ctx.pdev->dev);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, test_img_info);
> +
> + ret = init_sgt_bit(&sgt_bit, fake_bit, FAKE_BIT_SIZE);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + test_img_info->sgt = &sgt_bit;
> +
> + /* Re-program the fake FPGA using the image scatter list */
> + base_region_ctx.region->info = test_img_info;
> + ret = fpga_region_program_fpga(base_region_ctx.region);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + fake_fpga_mgr_check_write_sg(&mgr_ctx);
> +
> + KUNIT_EXPECT_EQ(test, 2, fake_fpga_mgr_get_rcfg_count(&mgr_ctx));
> +
> + KUNIT_EXPECT_EQ(test, 1, fake_fpga_bridge_get_state(&base_bridge_ctx));
> + KUNIT_EXPECT_EQ(test, 2, fake_fpga_bridge_get_cycles_count(&base_bridge_ctx));
> +
> + free_sgt_bit(&sgt_bit);
> + fpga_image_info_free(test_img_info);
> + fpga_free_base_sys(&mgr_ctx, &base_bridge_ctx, &base_region_ctx);
> +}
> +
> +static void fpga_pr_test(struct kunit *test)
> +{
> + int ret;
> +
> + struct fake_fpga_mgr mgr_ctx;
> + struct fake_fpga_bridge base_bridge_ctx;
> + struct fake_fpga_region base_region_ctx;
> +
> + struct fake_fpga_bridge pr_bridge_0_ctx;
> + struct fake_fpga_bridge pr_bridge_1_ctx;
> + struct fake_fpga_region pr_region_ctx;
> +
> + struct fpga_image_info *test_static_img_info;
> + struct fpga_image_info *test_pr_img_info;
> +
> + fpga_build_base_sys(test, &mgr_ctx, &base_bridge_ctx, &base_region_ctx);
> +
> + /* Allocate a fake test image using a buffer */
> + test_static_img_info = fpga_image_info_alloc(&mgr_ctx.pdev->dev);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, test_static_img_info);
> +
> + test_static_img_info->buf = fake_bit;
> + test_static_img_info->count = sizeof(fake_bit);
> +
> + kunit_info(test, "fake bitstream size: %zu\n", test_static_img_info->count);
> +
> + KUNIT_EXPECT_EQ(test, 0, fake_fpga_mgr_get_rcfg_count(&mgr_ctx));
> +
> + KUNIT_EXPECT_EQ(test, 0, fake_fpga_bridge_get_state(&base_bridge_ctx));
> + KUNIT_EXPECT_EQ(test, 0, fake_fpga_bridge_get_cycles_count(&base_bridge_ctx));
> +
> + /* Program the fake FPGA using the image buffer */
> + base_region_ctx.region->info = test_static_img_info;
> + ret = fpga_region_program_fpga(base_region_ctx.region);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + fake_fpga_mgr_check_write_buf(&mgr_ctx);
> +
> + KUNIT_EXPECT_EQ(test, 1, fake_fpga_mgr_get_rcfg_count(&mgr_ctx));
> +
> + KUNIT_EXPECT_EQ(test, 1, fake_fpga_bridge_get_state(&base_bridge_ctx));
> + KUNIT_EXPECT_EQ(test, 1, fake_fpga_bridge_get_cycles_count(&base_bridge_ctx));
> +
> + /* The static image contains a reconfigurable sub-region with two soft bridges */
> + ret = fake_fpga_bridge_register(&pr_bridge_0_ctx, test);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + ret = fake_fpga_bridge_register(&pr_bridge_1_ctx, test);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + ret = fake_fpga_region_register(&pr_region_ctx, mgr_ctx.mgr, test);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + ret = fake_fpga_region_add_bridge(&pr_region_ctx, pr_bridge_0_ctx.bridge);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + ret = fake_fpga_region_add_bridge(&pr_region_ctx, pr_bridge_1_ctx.bridge);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + /* Allocate a fake partial test image using a buffer */
> + test_pr_img_info = fpga_image_info_alloc(&mgr_ctx.pdev->dev);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, test_pr_img_info);
> +
> + test_pr_img_info->buf = fake_bit;
> + test_pr_img_info->count = sizeof(fake_bit) / 2;
> + test_pr_img_info->flags = FPGA_MGR_PARTIAL_RECONFIG;
> +
> + kunit_info(test, "fake partial bitstream size: %zu\n", test_pr_img_info->count);
> +
> + /* Program the reconfigurable sub-region */
> + pr_region_ctx.region->info = test_pr_img_info;
> + ret = fpga_region_program_fpga(pr_region_ctx.region);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + fake_fpga_mgr_check_write_buf(&mgr_ctx);
> +
> + KUNIT_EXPECT_EQ(test, 2, fake_fpga_mgr_get_rcfg_count(&mgr_ctx));
> +
> + KUNIT_EXPECT_EQ(test, 1, fake_fpga_bridge_get_state(&pr_bridge_0_ctx));
> + KUNIT_EXPECT_EQ(test, 1, fake_fpga_bridge_get_cycles_count(&pr_bridge_0_ctx));
> +
> + KUNIT_EXPECT_EQ(test, 1, fake_fpga_bridge_get_state(&pr_bridge_1_ctx));
> + KUNIT_EXPECT_EQ(test, 1, fake_fpga_bridge_get_cycles_count(&pr_bridge_1_ctx));
> +
> + /* Check that the base bridge has not been disabled */
> + KUNIT_EXPECT_EQ(test, 1, fake_fpga_bridge_get_state(&base_bridge_ctx));
> + KUNIT_EXPECT_EQ(test, 1, fake_fpga_bridge_get_cycles_count(&base_bridge_ctx));
> +
> + fpga_image_info_free(test_pr_img_info);
> + fpga_image_info_free(test_static_img_info);
> +
> + fake_fpga_region_unregister(&pr_region_ctx);
> + fake_fpga_bridge_unregister(&pr_bridge_0_ctx);
> + fake_fpga_bridge_unregister(&pr_bridge_1_ctx);
> +
> + fpga_free_base_sys(&mgr_ctx, &base_bridge_ctx, &base_region_ctx);
> +}
> +
> +static struct kunit_case fpga_test_cases[] = {
> + KUNIT_CASE(fpga_base_test),
> + KUNIT_CASE(fpga_pr_test),
> + {},
> +};
> +
> +static struct kunit_suite fpga_test_suite = {
> + .name = "fpga-tests",
> + .suite_init = fpga_suite_init,
> + .test_cases = fpga_test_cases,
> +};
> +
> +kunit_test_suite(fpga_test_suite);
