Commit c40cdb2c authored by Mike Frysinger's avatar Mike Frysinger
Browse files

Blackfin: add some isram-driver self tests



Make it easy to figure out if code changes here are correct.
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent dedfd5d7
......@@ -252,4 +252,10 @@ config ACCESS_CHECK
Say N here to disable that check to improve the performance.
config BFIN_ISRAM_SELF_TEST
bool "isram boot self tests"
default n
help
Run some self tests of the isram driver code at boot.
endmenu
......@@ -16,6 +16,8 @@
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define pr_fmt(fmt) "isram: " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
......@@ -23,6 +25,7 @@
#include <linux/sched.h>
#include <asm/blackfin.h>
#include <asm/dma.h>
/*
* IMPORTANT WARNING ABOUT THESE FUNCTIONS
......@@ -127,8 +130,7 @@ static bool isram_check_addr(const void *addr, size_t n)
(addr < (void *)(L1_CODE_START + L1_CODE_LENGTH))) {
if ((addr + n) > (void *)(L1_CODE_START + L1_CODE_LENGTH)) {
show_stack(NULL, NULL);
printk(KERN_ERR "isram_memcpy: copy involving %p length "
"(%zu) too long\n", addr, n);
pr_err("copy involving %p length (%zu) too long\n", addr, n);
}
return true;
}
......@@ -199,3 +201,209 @@ void *isram_memcpy(void *dest, const void *src, size_t n)
}
EXPORT_SYMBOL(isram_memcpy);
#ifdef CONFIG_BFIN_ISRAM_SELF_TEST
#define TEST_LEN 0x100
static __init void hex_dump(unsigned char *buf, int len)
{
while (len--)
pr_cont("%02x", *buf++);
}
static __init int isram_read_test(char *sdram, void *l1inst)
{
int i, ret = 0;
uint64_t data1, data2;
pr_info("INFO: running isram_read tests\n");
/* setup some different data to play with */
for (i = 0; i < TEST_LEN; ++i)
sdram[i] = i;
dma_memcpy(l1inst, sdram, TEST_LEN);
/* make sure we can read the L1 inst */
for (i = 0; i < TEST_LEN; i += sizeof(uint64_t)) {
data1 = isram_read(l1inst + i);
memcpy(&data2, sdram + i, sizeof(data2));
if (memcmp(&data1, &data2, sizeof(uint64_t))) {
pr_err("FAIL: isram_read(%p) returned %#llx but wanted %#llx\n",
l1inst + i, data1, data2);
++ret;
}
}
return ret;
}
static __init int isram_write_test(char *sdram, void *l1inst)
{
int i, ret = 0;
uint64_t data1, data2;
pr_info("INFO: running isram_write tests\n");
/* setup some different data to play with */
memset(sdram, 0, TEST_LEN * 2);
dma_memcpy(l1inst, sdram, TEST_LEN);
for (i = 0; i < TEST_LEN; ++i)
sdram[i] = i;
/* make sure we can write the L1 inst */
for (i = 0; i < TEST_LEN; i += sizeof(uint64_t)) {
memcpy(&data1, sdram + i, sizeof(data1));
isram_write(l1inst + i, data1);
data2 = isram_read(l1inst + i);
if (memcmp(&data1, &data2, sizeof(uint64_t))) {
pr_err("FAIL: isram_write(%p, %#llx) != %#llx\n",
l1inst + i, data1, data2);
++ret;
}
}
dma_memcpy(sdram + TEST_LEN, l1inst, TEST_LEN);
if (memcmp(sdram, sdram + TEST_LEN, TEST_LEN)) {
pr_err("FAIL: isram_write() did not work properly\n");
++ret;
}
return ret;
}
static __init int
_isram_memcpy_test(char pattern, void *sdram, void *l1inst, const char *smemcpy,
void *(*fmemcpy)(void *, const void *, size_t))
{
memset(sdram, pattern, TEST_LEN);
fmemcpy(l1inst, sdram, TEST_LEN);
fmemcpy(sdram + TEST_LEN, l1inst, TEST_LEN);
if (memcmp(sdram, sdram + TEST_LEN, TEST_LEN)) {
pr_err("FAIL: %s(%p <=> %p, %#x) failed (data is %#x)\n",
smemcpy, l1inst, sdram, TEST_LEN, pattern);
return 1;
}
return 0;
}
#define _isram_memcpy_test(a, b, c, d) _isram_memcpy_test(a, b, c, #d, d)
static __init int isram_memcpy_test(char *sdram, void *l1inst)
{
int i, j, thisret, ret = 0;
/* check broad isram_memcpy() */
pr_info("INFO: running broad isram_memcpy tests\n");
for (i = 0xf; i >= 0; --i)
ret += _isram_memcpy_test(i, sdram, l1inst, isram_memcpy);
/* check read of small, unaligned, and hardware 64bit limits */
pr_info("INFO: running isram_memcpy (read) tests\n");
for (i = 0; i < TEST_LEN; ++i)
sdram[i] = i;
dma_memcpy(l1inst, sdram, TEST_LEN);
thisret = 0;
for (i = 0; i < TEST_LEN - 32; ++i) {
unsigned char cmp[32];
for (j = 1; j <= 32; ++j) {
memset(cmp, 0, sizeof(cmp));
isram_memcpy(cmp, l1inst + i, j);
if (memcmp(cmp, sdram + i, j)) {
pr_err("FAIL: %p:", l1inst + 1);
hex_dump(cmp, j);
pr_cont(" SDRAM:");
hex_dump(sdram + i, j);
pr_cont("\n");
if (++thisret > 20) {
pr_err("FAIL: skipping remaining series\n");
i = TEST_LEN;
break;
}
}
}
}
ret += thisret;
/* check write of small, unaligned, and hardware 64bit limits */
pr_info("INFO: running isram_memcpy (write) tests\n");
memset(sdram + TEST_LEN, 0, TEST_LEN);
dma_memcpy(l1inst, sdram + TEST_LEN, TEST_LEN);
thisret = 0;
for (i = 0; i < TEST_LEN - 32; ++i) {
unsigned char cmp[32];
for (j = 1; j <= 32; ++j) {
isram_memcpy(l1inst + i, sdram + i, j);
dma_memcpy(cmp, l1inst + i, j);
if (memcmp(cmp, sdram + i, j)) {
pr_err("FAIL: %p:", l1inst + i);
hex_dump(cmp, j);
pr_cont(" SDRAM:");
hex_dump(sdram + i, j);
pr_cont("\n");
if (++thisret > 20) {
pr_err("FAIL: skipping remaining series\n");
i = TEST_LEN;
break;
}
}
}
}
ret += thisret;
return ret;
}
static __init int isram_test_init(void)
{
int ret;
char *sdram;
void *l1inst;
sdram = kmalloc(TEST_LEN * 2, GFP_KERNEL);
if (!sdram) {
pr_warning("SKIP: could not allocate sdram\n");
return 0;
}
l1inst = l1_inst_sram_alloc(TEST_LEN);
if (!l1inst) {
kfree(sdram);
pr_warning("SKIP: could not allocate L1 inst\n");
return 0;
}
/* sanity check initial L1 inst state */
ret = 1;
pr_info("INFO: running initial dma_memcpy checks\n");
if (_isram_memcpy_test(0xa, sdram, l1inst, dma_memcpy))
goto abort;
if (_isram_memcpy_test(0x5, sdram, l1inst, dma_memcpy))
goto abort;
ret = 0;
ret += isram_read_test(sdram, l1inst);
ret += isram_write_test(sdram, l1inst);
ret += isram_memcpy_test(sdram, l1inst);
abort:
sram_free(l1inst);
kfree(sdram);
if (ret)
return -EIO;
pr_info("PASS: all tests worked !\n");
return 0;
}
late_initcall(isram_test_init);
static __exit void isram_test_exit(void)
{
/* stub to allow unloading */
}
module_exit(isram_test_exit);
#endif
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