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habanalabs: rate limit error msg on waiting for CS

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In case a user submits a CS, and the submission fails, and the user doesn't
check the return value and instead use the error return value as a valid
sequence number of a CS and ask to wait on it, the driver will print an
error and return an error code for that wait.

The real problem happens if now the user ignores the error of the wait, and
try to wait again and again. This can lead to a flood of error messages
from the driver and even soft lockup event.

Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Reviewed-by: Tomer Tayar <ttayar@habana.ai>
This commit is contained in:
Oded Gabbay 2019-12-03 10:12:10 +02:00
parent 1698174271
commit 018e0e3594
2 changed files with 4 additions and 3 deletions
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5
drivers/misc/habanalabs/command_submission.c
View File

@ -824,8 +824,9 @@ int hl_cs_wait_ioctl(struct hl_fpriv *hpriv, void *data)
memset(args, 0, sizeof(*args));
if (rc < 0) {
dev_err(hdev->dev, "Error %ld on waiting for CS handle %llu\n",
rc, seq);
dev_err_ratelimited(hdev->dev,
"Error %ld on waiting for CS handle %llu\n",
rc, seq);
if (rc == -ERESTARTSYS) {
args->out.status = HL_WAIT_CS_STATUS_INTERRUPTED;
rc = -EINTR;

2
drivers/misc/habanalabs/context.c
View File

@ -176,7 +176,7 @@ struct dma_fence *hl_ctx_get_fence(struct hl_ctx *ctx, u64 seq)
spin_lock(&ctx->cs_lock);
if (seq >= ctx->cs_sequence) {
dev_notice(hdev->dev,
dev_notice_ratelimited(hdev->dev,
"Can't wait on seq %llu because current CS is at seq %llu\n",
seq, ctx->cs_sequence);
spin_unlock(&ctx->cs_lock);