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tegrakernel/kernel/nvgpu/userspace/units/posix-bitops/posix-bitops.c

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/*
* Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <stdlib.h>
#include <unit/io.h>
#include <unit/unit.h>
#include <nvgpu/bitops.h>
#define NUM_WORDS 4
static unsigned long single_ulong_maps[] = {
0UL,
~0UL,
0xff00ff00UL,
0x00ff00ffUL,
0xa5a5a5a5UL,
0x0000ffffUL,
0xffff0000UL,
0x1UL,
0x80000000UL,
BIT(16),
};
/*
* Can't fail - just some info prints.
*/
static int test_bitmap_info(struct unit_module *m, struct gk20a *g, void *args)
{
unit_info(m, "sizeof(unsigned long) = %zu\n", sizeof(unsigned long));
unit_info(m, "BITS_PER_LONG = %lu\n", BITS_PER_LONG);
return UNIT_SUCCESS;
}
static int test_ffs(struct unit_module *m, struct gk20a *g, void *args)
{
#define CHECK_FFS_WORD(w, answer) \
do { \
unsigned long ret = ffs(w); \
\
if (ret != (answer)) \
unit_return_fail(m, \
"ffs(0x%016lx) = %lu " \
"[expected %lu]\n", \
w, ret, answer); \
} while (0)
unsigned long i;
CHECK_FFS_WORD(single_ulong_maps[0], BITS_PER_LONG - 1UL);
CHECK_FFS_WORD(single_ulong_maps[1], 0UL);
CHECK_FFS_WORD(single_ulong_maps[2], 8UL);
CHECK_FFS_WORD(single_ulong_maps[3], 0UL);
CHECK_FFS_WORD(single_ulong_maps[4], 0UL);
CHECK_FFS_WORD(single_ulong_maps[5], 0UL);
CHECK_FFS_WORD(single_ulong_maps[6], 16UL);
CHECK_FFS_WORD(single_ulong_maps[7], 0UL);
CHECK_FFS_WORD(single_ulong_maps[8], 31UL);
CHECK_FFS_WORD(single_ulong_maps[9], 16UL);
#undef CHECK_FFS_WORD
/*
* Also just test every bit to make sure we definitely cover all
* possible return values of the function.
*/
for (i = 0; i < BITS_PER_LONG; i++) {
if (ffs(BIT(i)) != i)
unit_return_fail(m, "ffs(1 << %lu) != %lu [%lu]!\n",
i, i, ffs(BIT(i)));
}
return UNIT_SUCCESS;
}
static int test_fls(struct unit_module *m, struct gk20a *g, void *args)
{
#define CHECK_FLS_WORD(w, answer) \
do { \
unsigned long ret = fls(w); \
\
if (ret != (answer)) \
unit_return_fail(m, \
"fls(0x%016lx) = %lu " \
"[expected = %lu]\n", \
w, ret, answer); \
} while (0)
unsigned long i;
CHECK_FLS_WORD(single_ulong_maps[0], 0UL);
CHECK_FLS_WORD(single_ulong_maps[1], BITS_PER_LONG);
CHECK_FLS_WORD(single_ulong_maps[2], 32UL);
CHECK_FLS_WORD(single_ulong_maps[3], 24UL);
CHECK_FLS_WORD(single_ulong_maps[4], 32UL);
CHECK_FLS_WORD(single_ulong_maps[5], 16UL);
CHECK_FLS_WORD(single_ulong_maps[6], 32UL);
CHECK_FLS_WORD(single_ulong_maps[7], 1UL);
CHECK_FLS_WORD(single_ulong_maps[8], 32UL);
CHECK_FLS_WORD(single_ulong_maps[9], 17UL);
#undef CHECK_FLS_WORD
for (i = 0; i < BITS_PER_LONG; i++) {
if (fls(BIT(i)) != (i+1))
unit_return_fail(m, "fls(1 << %lu) != %lu! [%lu]\n",
i, i, fls(BIT(i)));
}
return UNIT_SUCCESS;
}
static int test_ffz(struct unit_module *m, struct gk20a *g, void *args)
{
unsigned long i;
/*
* Since ffz(w) is implemented as ffs(~w) this does less extensive
* testing; but it should still cover every line of ffs().
*/
for (i = 0; i < BITS_PER_LONG; i++) {
if (ffz(~BIT(i)) != i)
unit_return_fail(m, "ffz(~(1 << %lu)) != %lu! [%lu]\n",
i, i, ffz(BIT(i)));
}
return UNIT_SUCCESS;
}
struct test_find_bit_args {
bool find_zeros;
};
static struct test_find_bit_args first_bit_args = {
.find_zeros = false
};
static struct test_find_bit_args first_zero_args = {
.find_zeros = true
};
static int test_find_first_bit(struct unit_module *m,
struct gk20a *g, void *__args)
{
struct test_find_bit_args *args = __args;
unsigned long words[NUM_WORDS];
unsigned long word_idx, bit_idx;
unsigned long (*finder_function)(const unsigned long *, unsigned long);
unsigned long result;
if (args->find_zeros)
finder_function = find_first_zero_bit;
else
finder_function = find_first_bit;
/*
* First test: verify that the size parameter works. We only need the
* first word for this.
*/
words[0] = ~0xffffUL;
if (args->find_zeros)
words[0] = 0xffff;
if (finder_function(words, 8UL) != 8UL)
unit_return_fail(m,
"find_first_%s(0x%lx, 8) -> %lu [WRONG]\n",
args->find_zeros ? "zero_bit" : "bit",
words[0], finder_function(words, 8UL));
if (finder_function(words, 20UL) != 16UL)
unit_return_fail(m,
"find_first_%s(0x%lx, 16) -> %lu [WRONG]\n",
args->find_zeros ? "zero_bit" : "bit",
words[0], finder_function(words, 20UL));
/*
* Now make sure that for full/empty bitmap find_next_*() returns
* the size parameter.
*/
memset(words, args->find_zeros ? 0xff : 0x00, sizeof(words));
result = finder_function(words, NUM_WORDS * BITS_PER_LONG);
if (result != NUM_WORDS * BITS_PER_LONG)
unit_return_fail(m, "find_first_%s() failed with empty map\n",
args->find_zeros ? "zero_bit" : "bit");
/*
* Third test: set (or zero) the entire bitmap and incrementally clear
* bits. Check that we are correct even with multiple words.
*/
memset(words, args->find_zeros ? 0x00 : 0xff, sizeof(words));
for (word_idx = 0; word_idx < NUM_WORDS; word_idx++) {
for (bit_idx = 0; bit_idx < BITS_PER_LONG; bit_idx++) {
unsigned long check =
(word_idx * BITS_PER_LONG) + bit_idx;
unsigned long answer =
finder_function(words,
NUM_WORDS * BITS_PER_LONG);
if (answer != check)
unit_return_fail(m,
"find_first_%s loop: "
"word_idx = %lu bit_idx = %lu "
"-> %lu [WRONG]\n",
args->find_zeros ? "zero_bit" : "bit",
word_idx, bit_idx, answer);
/*
* Now set/clear this bit in preparation for the next
* test.
*/
if (args->find_zeros)
words[word_idx] |= BIT(bit_idx);
else
words[word_idx] &= ~BIT(bit_idx);
}
}
return UNIT_SUCCESS;
}
/*
* Note: the find_first_bit() test also effectively tests the underlying
* find_next_bit() code since find_first_bit() is just find_next_bit()
* with a 0 start.
*/
static int test_find_next_bit(struct unit_module *m,
struct gk20a *g, void *__args)
{
unsigned long words[NUM_WORDS];
unsigned long i, result;
/*
* Fully unset list. Should always return size.
*/
memset(words, 0x00, sizeof(words));
for (i = 0; i < NUM_WORDS * BITS_PER_LONG; i++) {
result = find_next_bit(words, NUM_WORDS * BITS_PER_LONG, i);
if (result != NUM_WORDS * BITS_PER_LONG)
unit_return_fail(m, "Fail: empty map (%lu)\n", i);
}
/*
* Use a fully set list but increment the offset.
*/
memset(words, 0xff, sizeof(words));
for (i = 0; i < NUM_WORDS * BITS_PER_LONG; i++) {
unsigned long first =
find_next_bit(words, NUM_WORDS * BITS_PER_LONG, i);
if (first != i)
unit_return_fail(m,
"Fail: first = %lu; should be %lu\n",
first, i);
}
/*
* Start > n should return n.
*/
#define TEST_START_GREATER_THAN_N(m, map, n, start) \
do { \
if (find_next_bit(map, n, start) != n) \
unit_return_fail(m, \
"Start not greater than N ?? " \
"start=%lu, N=%lu\n", \
start, n); \
} while (0)
TEST_START_GREATER_THAN_N(m, words, BITS_PER_LONG, BITS_PER_LONG + 1);
TEST_START_GREATER_THAN_N(m, words, 32UL, 64UL);
TEST_START_GREATER_THAN_N(m, words,
BITS_PER_LONG * 2, (BITS_PER_LONG * 2) + 1);
TEST_START_GREATER_THAN_N(m, words, 0UL, 1UL);
TEST_START_GREATER_THAN_N(m, words, 0UL, BITS_PER_LONG * 2);
TEST_START_GREATER_THAN_N(m, words, 0UL, BITS_PER_LONG * NUM_WORDS + 1);
#undef TEST_START_GREATER_THAN_N
return UNIT_SUCCESS;
}
#define TEST_BITMAP_SIZE (BITS_PER_LONG * 4)
/*
* 32/64 bit invarient.
*/
static DECLARE_BITMAP(bmap_all_zeros, TEST_BITMAP_SIZE) =
{
0x0UL, 0x0UL, 0x0UL, 0x0UL
};
static DECLARE_BITMAP(bmap_all_ones, TEST_BITMAP_SIZE) =
{
~0x0UL, ~0x0UL, ~0x0UL, ~0x0UL
};
static int test_find_zero_area(struct unit_module *m,
struct gk20a *g, void *unused)
{
#define FAIL_MSG "Fail: bmap-test='%s' (i=%lu)\n"
#define FAIL_MSG_EX "Fail: bmap-test='%s' (i=%lu, j=%lu)\n"
unsigned long i, j, result;
unsigned long words[NUM_WORDS];
for (i = 0; i < TEST_BITMAP_SIZE; i++) {
result = bitmap_find_next_zero_area_off(bmap_all_zeros,
TEST_BITMAP_SIZE,
i,
TEST_BITMAP_SIZE - i,
0, 0);
if (result != i)
unit_return_fail(m, FAIL_MSG,
"all_zeros: alloc-to-end", i);
result = bitmap_find_next_zero_area_off(bmap_all_zeros,
TEST_BITMAP_SIZE,
i,
1,
0, 0);
if (result != i)
unit_return_fail(m, FAIL_MSG,
"all_zeros: alloc-one-bit", i);
result = bitmap_find_next_zero_area_off(bmap_all_zeros,
TEST_BITMAP_SIZE,
0,
TEST_BITMAP_SIZE - i,
0, 0);
if (result != 0)
unit_return_fail(m, FAIL_MSG,
"all_zeros: alloc-i-bits-at-0", i);
}
/*
* For the all ones bit map not a single alloc should succeed. We can
* just iterate through them all and make sure they all fail.
*/
for (i = 0; i < TEST_BITMAP_SIZE; i++) {
for (j = 0; j < (TEST_BITMAP_SIZE - i); j++) {
result = bitmap_find_next_zero_area_off(bmap_all_ones,
TEST_BITMAP_SIZE,
i,
j,
0, 0);
if (result != TEST_BITMAP_SIZE)
unit_return_fail(m, FAIL_MSG_EX,
"all_ones: failed", i, j);
}
}
/*
* Alternating nibbles (4 bits). Make sure we don't start searching from
* too high in the bitmap since that will cause failures that are
* actually valid. This keeps the logic in the below loop a little more
* simple.
*/
memset(words, 0x0f, sizeof(words));
for (i = 0; i < ((NUM_WORDS * BITS_PER_LONG) - 8); i++) {
for (j = 0; j < ((NUM_WORDS * BITS_PER_LONG) - i - 8); j++) {
result = bitmap_find_next_zero_area_off(words,
NUM_WORDS * BITS_PER_LONG,
i,
j,
0, 0);
/*
* Should only return a valid result when j < 4 (since
* the map consists of 4 ones, then 4 zeros,
* alternating.
*/
if (j <= 4 && result >= (NUM_WORDS * BITS_PER_LONG))
unit_return_fail(m, FAIL_MSG_EX,
"alternating-nibbles: failed",
i, j);
if (j > 4 && result != (NUM_WORDS * BITS_PER_LONG))
unit_return_fail(m, FAIL_MSG_EX,
"alternating-nibbles: failed",
i, j);
result = bitmap_find_next_zero_area_off(words,
NUM_WORDS * BITS_PER_LONG,
i,
(j % 4) + 1,
0x3, 0);
if (result % 8 != 4)
unit_return_fail(m, FAIL_MSG_EX,
"basic-align_mask: failed",
i, j);
result = bitmap_find_next_zero_area_off(words,
NUM_WORDS * BITS_PER_LONG,
i,
(j % 2) + 1,
0x7, 2);
if (result % 8 != 6)
unit_return_fail(m, FAIL_MSG_EX,
"basic-align_offset: failed",
i, j);
}
}
#undef FAIL_MSG
#undef FAIL_MSG_EX
return UNIT_SUCCESS;
}
struct test_setclear_args {
bool clear;
};
static struct test_setclear_args set_args = {
.clear = false,
};
static struct test_setclear_args clear_args = {
.clear = true,
};
static void __print_bitmap(unsigned long *map, unsigned long length)
{
unsigned int idx, bidx;
for (idx = 0; idx < (length / BITS_PER_LONG); idx++) {
printf(" ");
for (bidx = 0; bidx < BITS_PER_LONG; bidx++) {
printf("%c", (map[idx] & BIT(bidx)) ? '1' : '0');
if (bidx % 4 == 3)
printf(" ");
}
printf("\n");
}
printf("\n");
}
/*
* Verify the bits from i to i + len are set and no others are set. 'size' is in
* bits (not words).
*/
static bool verify_set_buf(unsigned long *words, unsigned long size,
unsigned long i, unsigned long len,
bool invert)
{
unsigned int idx, bidx;
unsigned int bit, bit_value;
unsigned int set_start, set_end;
unsigned int set_value = invert ? 0 : 1;
unsigned int clear_value = invert ? 1 : 0;
set_start = i;
set_end = i + len;
for (idx = 0; idx < (size / BITS_PER_LONG); idx++) {
for (bidx = 0; bidx < BITS_PER_LONG; bidx++) {
bit = idx * BITS_PER_LONG + bidx;
bit_value = !!(words[idx] & BIT(bidx));
/*
* Bit inside set zone.
*/
if ((bit >= set_start && bit < set_end) &&
bit_value != set_value)
return false;
/*
* Bit outside set zone.
*/
if ((bit < set_start || bit >= set_end) &&
bit_value != clear_value)
return false;
}
}
return true;
}
static int test_single_bitops(struct unit_module *m,
struct gk20a *g, void *__args)
{
unsigned long words[NUM_WORDS];
unsigned int i;
/*
* First set all the bits and make sure the words are set.
*/
for (i = 0; i < NUM_WORDS * BITS_PER_LONG; i++)
set_bit(i, words);
if (!verify_set_buf(words, NUM_WORDS * BITS_PER_LONG,
0, NUM_WORDS * BITS_PER_LONG, false)) {
__print_bitmap(words, NUM_WORDS * BITS_PER_LONG);
unit_return_fail(m, "set_bit: Failed to set a bit!\n");
}
/*
* Now make sure the test_bit works for set bits.
*/
for (i = 0; i < NUM_WORDS * BITS_PER_LONG; i++)
if (!test_bit(i, words))
unit_return_fail(m, "test_bit: bit %d failed!\n", i);
for (i = 0; i < NUM_WORDS * BITS_PER_LONG; i++)
clear_bit(i, words);
if (!verify_set_buf(words, NUM_WORDS * BITS_PER_LONG,
0, NUM_WORDS * BITS_PER_LONG, true)) {
__print_bitmap(words, NUM_WORDS * BITS_PER_LONG);
unit_return_fail(m, "clear_bit: Failed to set a bit!\n");
}
for (i = 0; i < NUM_WORDS * BITS_PER_LONG; i++)
if (test_bit(i, words))
unit_return_fail(m, "test_bit: bit %d failed!\n", i);
return UNIT_SUCCESS;
}
static int test_bit_setclear(struct unit_module *m,
struct gk20a *g, void *__args)
{
struct test_setclear_args *args = __args;
void (*testfn)(int, volatile unsigned long *) =
args->clear ? clear_bit : set_bit;
unsigned long words[NUM_WORDS];
unsigned int i;
memset(words, args->clear ? 0xff : 0x0, sizeof(words));
for (i = 0; i < NUM_WORDS * BITS_PER_LONG; i++)
testfn(i, words);
if (!verify_set_buf(words, NUM_WORDS * BITS_PER_LONG,
0, NUM_WORDS * BITS_PER_LONG, args->clear)) {
__print_bitmap(words, NUM_WORDS * BITS_PER_LONG);
unit_return_fail(m, "%s_bit: Failed to %s a bit!\n",
args->clear ? "clear" : "set",
args->clear ? "clear" : "set");
}
return UNIT_SUCCESS;
}
static int test_test_and_setclear_bit(struct unit_module *m,
struct gk20a *g, void *__args)
{
struct test_setclear_args *args = __args;
bool (*testfn)(int, volatile unsigned long *) =
args->clear ? test_and_clear_bit : test_and_set_bit;
bool (*testfn_reset)(int, volatile unsigned long *) =
args->clear ? test_and_set_bit : test_and_clear_bit;
unsigned long words[NUM_WORDS];
unsigned int i;
memset(words, args->clear ? 0xff : 0x0, sizeof(words));
/*
* First we will set/clear the bits. Then we will clear/set the bits
* (i.e do the opposite of this loop).
*/
for (i = 0; i < NUM_WORDS * BITS_PER_LONG; i++) {
bool status = testfn(i, words);
if (status != args->clear) {
__print_bitmap(words, NUM_WORDS * BITS_PER_LONG);
unit_return_fail(m, "test_and_%s_bit: Failed at %d\n",
args->clear ? "clear" : "set", i);
}
}
for (i = 0; i < NUM_WORDS * BITS_PER_LONG; i++) {
bool status = testfn_reset(i, words);
if (status == args->clear) {
__print_bitmap(words, NUM_WORDS * BITS_PER_LONG);
unit_return_fail(m, "test_and_%s_bit: Failed at %d\n",
args->clear ? "set" : "clear", i);
}
}
/* The bitmap should be the same as we started with. */
if (!verify_set_buf(words, NUM_WORDS * BITS_PER_LONG,
0, NUM_WORDS * BITS_PER_LONG, !args->clear)) {
__print_bitmap(words, NUM_WORDS * BITS_PER_LONG);
unit_return_fail(m,
"test_and_%s_bit: Final bitmap is wrong!\n",
args->clear ? "set" : "clear");
}
return UNIT_SUCCESS;
}
static int test_bitmap_setclear(struct unit_module *m,
struct gk20a *g, void *__args)
{
struct test_setclear_args *args = __args;
void (*testfn)(unsigned long *, unsigned int, int) =
args->clear ? bitmap_clear : bitmap_set;
unsigned long words[NUM_WORDS];
unsigned long i, j;
int set_char = args->clear ? 0xff : 0x0;
/*
* Run through all combos of set/clear for a 4 word bitmap.
*/
for (i = 0; i < NUM_WORDS * BITS_PER_LONG; i++) {
for (j = 0; j < (NUM_WORDS * BITS_PER_LONG) - i; j++) {
/*
* Just make sure we start in a known state.
*/
memset(words, set_char, sizeof(words));
testfn(words, i, j);
if (!verify_set_buf(words, NUM_WORDS * BITS_PER_LONG,
i, j, args->clear)) {
__print_bitmap(words, NUM_WORDS * BITS_PER_LONG);
unit_return_fail(m,
"%s: fail at i,j = %lu,%lu\n",
args->clear ? "clear" : "set",
i, j);
}
}
}
return UNIT_SUCCESS;
}
struct unit_module_test posix_bitops_tests[] = {
UNIT_TEST(info, test_bitmap_info, NULL),
UNIT_TEST(ffs, test_ffs, NULL),
UNIT_TEST(fls, test_fls, NULL),
UNIT_TEST(ffz, test_ffz, NULL),
UNIT_TEST(find_first_bit, test_find_first_bit, &first_bit_args),
UNIT_TEST(find_first_zero_bit, test_find_first_bit, &first_zero_args),
UNIT_TEST(find_next_bit, test_find_next_bit, NULL),
UNIT_TEST(find_zero_area, test_find_zero_area, NULL),
UNIT_TEST(single_bitops, test_single_bitops, NULL),
UNIT_TEST(bit_set, test_bit_setclear, &set_args),
UNIT_TEST(bit_clear, test_bit_setclear, &clear_args),
UNIT_TEST(test_and_set_bit, test_test_and_setclear_bit, &set_args),
UNIT_TEST(test_and_clear_bit, test_test_and_setclear_bit, &clear_args),
UNIT_TEST(bitmap_set, test_bitmap_setclear, &set_args),
UNIT_TEST(bitmap_clear, test_bitmap_setclear, &clear_args),
};
UNIT_MODULE(posix_bitops, posix_bitops_tests, UNIT_PRIO_POSIX_TEST);
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