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Date:   Sun, 3 May 2020 00:19:19 +0530
From:   Syed Nayyar Waris <syednwaris@gmail.com>
To:     akpm@linux-foundation.org
Cc:     andriy.shevchenko@linux.intel.com, vilhelm.gray@gmail.com,
        linus.walleij@linaro.org, linux-kernel@vger.kernel.org
Subject: [PATCH v4 2/4] lib/test_bitmap.c: Add for_each_set_clump test cases
Message-ID: <3eeb13d101db69be8eca739522bbf303527339bd.1588443578.git.syednwaris@gmail.com>
References: <cover.1588443578.git.syednwaris@gmail.com>
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The introduction of the generic for_each_set_clump macro need test
cases to verify the implementation. This patch adds test cases for
scenarios in which clump sizes are 8 bits, 24 bits, 30 bits and 6 bits.
The cases contain situations where clump is getting split at the word
boundary and also when zeroes are present in the start and middle of
bitmap.

Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Syed Nayyar Waris <syednwaris@gmail.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
---
Changes in v4:
 - Use 'for' loop in test function of 'for_each_set_clump'.

Changes in v3:
 - No Change.

Changes in v2:
 - Unify different tests for 'for_each_set_clump'. Pass test data as
   function parameters.
 - Remove unnecessary bitmap_zero calls.

 lib/test_bitmap.c | 141 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)

diff --git a/lib/test_bitmap.c b/lib/test_bitmap.c
index 6b13150667f5..a2a1c411dd62 100644
--- a/lib/test_bitmap.c
+++ b/lib/test_bitmap.c
@@ -155,6 +155,38 @@ static bool __init __check_eq_clump8(const char *srcfile, unsigned int line,
 	return true;
 }
 
+static bool __init __check_eq_clump(const char *srcfile, unsigned int line,
+				    const unsigned int offset,
+				    const unsigned int size,
+				    const unsigned long *const clump_exp,
+				    const unsigned long *const clump,
+				    const unsigned long clump_size)
+{
+	unsigned long exp;
+
+	if (offset >= size) {
+		pr_warn("[%s:%u] bit offset for clump out-of-bounds: expected less than %u, got %u\n",
+			srcfile, line, size, offset);
+		return false;
+	}
+
+	exp = clump_exp[offset / clump_size];
+	if (!exp) {
+		pr_warn("[%s:%u] bit offset for zero clump: expected nonzero clump, got bit offset %u with clump value 0",
+			srcfile, line, offset);
+		return false;
+	}
+
+	if (*clump != exp) {
+		pr_warn("[%s:%u] expected clump value of 0x%lX, got clump value of 0x%lX",
+			srcfile, line, exp, *clump);
+		return false;
+	}
+
+	return true;
+}
+
+
 #define __expect_eq(suffix, ...)					\
 	({								\
 		int result = 0;						\
@@ -172,6 +204,7 @@ static bool __init __check_eq_clump8(const char *srcfile, unsigned int line,
 #define expect_eq_pbl(...)		__expect_eq(pbl, ##__VA_ARGS__)
 #define expect_eq_u32_array(...)	__expect_eq(u32_array, ##__VA_ARGS__)
 #define expect_eq_clump8(...)		__expect_eq(clump8, ##__VA_ARGS__)
+#define expect_eq_clump(...)		__expect_eq(clump, ##__VA_ARGS__)
 
 static void __init test_zero_clear(void)
 {
@@ -588,6 +621,71 @@ static const unsigned char clump_exp[] __initconst = {
 	0x05,	/* non-adjacent 2 bits set */
 };
 
+static const unsigned long bitmap_test_data[] __initconst = {
+	0x38000201,
+	0x05ff0f38,
+	0xeffedcba,
+	0xbbbbabcd,
+	0x000000aa,
+	0x000000aa,
+	0x00ff0000,
+	0xaaaaaa00,
+	0xff000000,
+	0x00aa0000,
+	0x00000000,
+	0x00000000,
+	0x00000000,
+	0x0f000000,
+	0x00000ac0,
+};
+
+static const unsigned long clump_exp1[] __initconst = {
+	0x01,	/* 1 bit set */
+	0x02,	/* non-edge 1 bit set */
+	0x00,	/* zero bits set */
+	0x38,	/* 3 bits set across 4-bit boundary */
+	0x38,	/* Repeated clump */
+	0x0F,	/* 4 bits set */
+	0xFF,	/* all bits set */
+	0x05,	/* non-adjacent 2 bits set */
+};
+
+static const unsigned long clump_exp2[] __initconst = {
+	0xfedcba,	/* 24 bits */
+	0xabcdef,
+	0xaabbbb,	/* Clump split between 2 words */
+	0x000000,	/* zeroes in between */
+	0x0000aa,
+	0x000000,
+	0x0000ff,
+	0xaaaaaa,
+	0x000000,
+	0x0000ff,
+};
+
+static const unsigned long clump_exp3[] __initconst = {
+	0x00000000,	/* starting with 0s*/
+	0x00000000,	/* All 0s */
+	0x00000000,
+	0x00000000,
+	0x3f00000f,     /* Non zero set */
+	0x2aa80003,
+	0x00000aaa,
+	0x00003fc0,
+};
+
+static const unsigned long clump_exp4[] __initconst = {
+	0x00,
+	0x2b,
+};
+
+static const unsigned long * const clump_data[] __initconst = {
+	clump_exp1,
+	clump_exp2,
+	clump_exp3,
+	clump_exp4,
+};
+
 static void __init test_for_each_set_clump8(void)
 {
 #define CLUMP_EXP_NUMBITS 64
@@ -610,6 +708,48 @@ static void __init test_for_each_set_clump8(void)
 		expect_eq_clump8(start, CLUMP_EXP_NUMBITS, clump_exp, &clump);
 }
 
+static void __init execute_for_each_set_clump_test(unsigned long *bits,
+				unsigned long size,
+				unsigned long clump_size,
+				const unsigned long *clump_exp)
+{
+	unsigned long start, clump;
+
+	for_each_set_clump(start, clump, bits, size, clump_size)
+		expect_eq_clump(start, size, clump_exp, &clump, clump_size);
+}
+
+static void __init prepare_test_data(unsigned long * bits,
+				const unsigned long * test_data,
+				int start, int count)
+{
+	int i;
+	unsigned long position = 0;
+
+	for(i = 0; i < count; i++)
+	{
+		bitmap_set_value(bits, test_data[start++], position, 32);
+		position += 32;
+	}
+}
+
+static void __init test_for_each_set_clump(void)
+{
+	int i;
+	int count[] = {2, 8, 4, 1};
+	int offset[] = {0, 2, 10, 14};
+	unsigned long limit[] = {64, 240, 240, 18};
+	unsigned long clump_size[] = {8, 24, 30, 6};
+	DECLARE_BITMAP(bits, 256);
+
+	for(i = 0; i < 4; i++)
+	{
+		prepare_test_data(bits, bitmap_test_data, offset[i], count[i]);
+		execute_for_each_set_clump_test(bits, limit[i],
+					clump_size[i], clump_data[i]);
+	}
+}
+
 static void __init selftest(void)
 {
 	test_zero_clear();
@@ -623,6 +763,7 @@ static void __init selftest(void)
 	test_bitmap_parselist_user();
 	test_mem_optimisations();
 	test_for_each_set_clump8();
+	test_for_each_set_clump();
 }
 
 KSTM_MODULE_LOADERS(test_bitmap);
-- 
2.26.2