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-rw-r--r--Documentation/dmatest.txt6
-rw-r--r--drivers/dma/dmatest.c182
2 files changed, 132 insertions, 56 deletions
diff --git a/Documentation/dmatest.txt b/Documentation/dmatest.txt
index d05782b26a2e..279ac0a8c5b1 100644
--- a/Documentation/dmatest.txt
+++ b/Documentation/dmatest.txt
@@ -75,5 +75,7 @@ The message format is unified across the different types of errors. A number in
the parens represents additional information, e.g. error code, error counter,
or status.
-Note that the buffer comparison is done in the old way, i.e. data is not
-collected and just printed out.
+Comparison between buffers is stored to the dedicated structure.
+
+Note that the verify result is now accessible only via file 'results' in the
+debugfs.
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index 3697bd49ed4c..d8ce4ecfef18 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -96,6 +96,20 @@ enum dmatest_error_type {
DMATEST_ET_DMA_ERROR,
DMATEST_ET_DMA_IN_PROGRESS,
DMATEST_ET_VERIFY,
+ DMATEST_ET_VERIFY_BUF,
+};
+
+struct dmatest_verify_buffer {
+ unsigned int index;
+ u8 expected;
+ u8 actual;
+};
+
+struct dmatest_verify_result {
+ unsigned int error_count;
+ struct dmatest_verify_buffer data[MAX_ERROR_COUNT];
+ u8 pattern;
+ bool is_srcbuf;
};
struct dmatest_thread_result {
@@ -106,10 +120,11 @@ struct dmatest_thread_result {
unsigned int len;
enum dmatest_error_type type;
union {
- unsigned long data;
- dma_cookie_t cookie;
- enum dma_status status;
- int error;
+ unsigned long data;
+ dma_cookie_t cookie;
+ enum dma_status status;
+ int error;
+ struct dmatest_verify_result *vr;
};
};
@@ -246,35 +261,9 @@ static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len,
}
}
-static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
- unsigned int counter, bool is_srcbuf)
-{
- u8 diff = actual ^ pattern;
- u8 expected = pattern | (~counter & PATTERN_COUNT_MASK);
- const char *thread_name = current->comm;
-
- if (is_srcbuf)
- pr_warning("%s: srcbuf[0x%x] overwritten!"
- " Expected %02x, got %02x\n",
- thread_name, index, expected, actual);
- else if ((pattern & PATTERN_COPY)
- && (diff & (PATTERN_COPY | PATTERN_OVERWRITE)))
- pr_warning("%s: dstbuf[0x%x] not copied!"
- " Expected %02x, got %02x\n",
- thread_name, index, expected, actual);
- else if (diff & PATTERN_SRC)
- pr_warning("%s: dstbuf[0x%x] was copied!"
- " Expected %02x, got %02x\n",
- thread_name, index, expected, actual);
- else
- pr_warning("%s: dstbuf[0x%x] mismatch!"
- " Expected %02x, got %02x\n",
- thread_name, index, expected, actual);
-}
-
-static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
- unsigned int end, unsigned int counter, u8 pattern,
- bool is_srcbuf)
+static unsigned int dmatest_verify(struct dmatest_verify_result *vr, u8 **bufs,
+ unsigned int start, unsigned int end, unsigned int counter,
+ u8 pattern, bool is_srcbuf)
{
unsigned int i;
unsigned int error_count = 0;
@@ -282,6 +271,7 @@ static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
u8 expected;
u8 *buf;
unsigned int counter_orig = counter;
+ struct dmatest_verify_buffer *vb;
for (; (buf = *bufs); bufs++) {
counter = counter_orig;
@@ -289,9 +279,12 @@ static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
actual = buf[i];
expected = pattern | (~counter & PATTERN_COUNT_MASK);
if (actual != expected) {
- if (error_count < MAX_ERROR_COUNT)
- dmatest_mismatch(actual, pattern, i,
- counter, is_srcbuf);
+ if (error_count < MAX_ERROR_COUNT && vr) {
+ vb = &vr->data[error_count];
+ vb->index = i;
+ vb->expected = expected;
+ vb->actual = actual;
+ }
error_count++;
}
counter++;
@@ -340,6 +333,30 @@ static unsigned int min_odd(unsigned int x, unsigned int y)
return val % 2 ? val : val - 1;
}
+static char *verify_result_get_one(struct dmatest_verify_result *vr,
+ unsigned int i)
+{
+ struct dmatest_verify_buffer *vb = &vr->data[i];
+ u8 diff = vb->actual ^ vr->pattern;
+ static char buf[512];
+ char *msg;
+
+ if (vr->is_srcbuf)
+ msg = "srcbuf overwritten!";
+ else if ((vr->pattern & PATTERN_COPY)
+ && (diff & (PATTERN_COPY | PATTERN_OVERWRITE)))
+ msg = "dstbuf not copied!";
+ else if (diff & PATTERN_SRC)
+ msg = "dstbuf was copied!";
+ else
+ msg = "dstbuf mismatch!";
+
+ snprintf(buf, sizeof(buf) - 1, "%s [0x%x] Expected %02x, got %02x", msg,
+ vb->index, vb->expected, vb->actual);
+
+ return buf;
+}
+
static char *thread_result_get(const char *name,
struct dmatest_thread_result *tr)
{
@@ -355,6 +372,7 @@ static char *thread_result_get(const char *name,
[DMATEST_ET_DMA_IN_PROGRESS] =
"got completion callback (DMA_IN_PROGRESS)",
[DMATEST_ET_VERIFY] = "errors",
+ [DMATEST_ET_VERIFY_BUF] = "verify errors",
};
static char buf[512];
@@ -392,6 +410,51 @@ static int thread_result_add(struct dmatest_info *info,
return 0;
}
+static unsigned int verify_result_add(struct dmatest_info *info,
+ struct dmatest_result *r, unsigned int n,
+ unsigned int src_off, unsigned int dst_off, unsigned int len,
+ u8 **bufs, int whence, unsigned int counter, u8 pattern,
+ bool is_srcbuf)
+{
+ struct dmatest_verify_result *vr;
+ unsigned int error_count;
+ unsigned int buf_off = is_srcbuf ? src_off : dst_off;
+ unsigned int start, end;
+
+ if (whence < 0) {
+ start = 0;
+ end = buf_off;
+ } else if (whence > 0) {
+ start = buf_off + len;
+ end = info->params.buf_size;
+ } else {
+ start = buf_off;
+ end = buf_off + len;
+ }
+
+ vr = kmalloc(sizeof(*vr), GFP_KERNEL);
+ if (!vr) {
+ pr_warn("dmatest: No memory to store verify result\n");
+ return dmatest_verify(NULL, bufs, start, end, counter, pattern,
+ is_srcbuf);
+ }
+
+ vr->pattern = pattern;
+ vr->is_srcbuf = is_srcbuf;
+
+ error_count = dmatest_verify(vr, bufs, start, end, counter, pattern,
+ is_srcbuf);
+ if (error_count) {
+ vr->error_count = error_count;
+ thread_result_add(info, r, DMATEST_ET_VERIFY_BUF, n, src_off,
+ dst_off, len, (unsigned long)vr);
+ return error_count;
+ }
+
+ kfree(vr);
+ return 0;
+}
+
static void result_free(struct dmatest_info *info, const char *name)
{
struct dmatest_result *r, *_r;
@@ -404,6 +467,8 @@ static void result_free(struct dmatest_info *info, const char *name)
continue;
list_for_each_entry_safe(tr, _tr, &r->results, node) {
+ if (tr->type == DMATEST_ET_VERIFY_BUF)
+ kfree(tr->vr);
list_del(&tr->node);
kfree(tr);
}
@@ -687,25 +752,26 @@ static int dmatest_func(void *data)
error_count = 0;
pr_debug("%s: verifying source buffer...\n", thread_name);
- error_count += dmatest_verify(thread->srcs, 0, src_off,
+ error_count += verify_result_add(info, result, total_tests,
+ src_off, dst_off, len, thread->srcs, -1,
0, PATTERN_SRC, true);
- error_count += dmatest_verify(thread->srcs, src_off,
- src_off + len, src_off,
- PATTERN_SRC | PATTERN_COPY, true);
- error_count += dmatest_verify(thread->srcs, src_off + len,
- params->buf_size, src_off + len,
- PATTERN_SRC, true);
-
- pr_debug("%s: verifying dest buffer...\n",
- thread->task->comm);
- error_count += dmatest_verify(thread->dsts, 0, dst_off,
+ error_count += verify_result_add(info, result, total_tests,
+ src_off, dst_off, len, thread->srcs, 0,
+ src_off, PATTERN_SRC | PATTERN_COPY, true);
+ error_count += verify_result_add(info, result, total_tests,
+ src_off, dst_off, len, thread->srcs, 1,
+ src_off + len, PATTERN_SRC, true);
+
+ pr_debug("%s: verifying dest buffer...\n", thread_name);
+ error_count += verify_result_add(info, result, total_tests,
+ src_off, dst_off, len, thread->dsts, -1,
0, PATTERN_DST, false);
- error_count += dmatest_verify(thread->dsts, dst_off,
- dst_off + len, src_off,
- PATTERN_SRC | PATTERN_COPY, false);
- error_count += dmatest_verify(thread->dsts, dst_off + len,
- params->buf_size, dst_off + len,
- PATTERN_DST, false);
+ error_count += verify_result_add(info, result, total_tests,
+ src_off, dst_off, len, thread->dsts, 0,
+ src_off, PATTERN_SRC | PATTERN_COPY, false);
+ error_count += verify_result_add(info, result, total_tests,
+ src_off, dst_off, len, thread->dsts, 1,
+ dst_off + len, PATTERN_DST, false);
if (error_count) {
thread_result_add(info, result, DMATEST_ET_VERIFY,
@@ -1085,12 +1151,20 @@ static int dtf_results_show(struct seq_file *sf, void *data)
struct dmatest_info *info = sf->private;
struct dmatest_result *result;
struct dmatest_thread_result *tr;
+ unsigned int i;
mutex_lock(&info->results_lock);
list_for_each_entry(result, &info->results, node) {
- list_for_each_entry(tr, &result->results, node)
+ list_for_each_entry(tr, &result->results, node) {
seq_printf(sf, "%s\n",
thread_result_get(result->name, tr));
+ if (tr->type == DMATEST_ET_VERIFY_BUF) {
+ for (i = 0; i < tr->vr->error_count; i++) {
+ seq_printf(sf, "\t%s\n",
+ verify_result_get_one(tr->vr, i));
+ }
+ }
+ }
}
mutex_unlock(&info->results_lock);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 09:15:46 +0000