On Mon, Mar 27, 2023 at 06:18:54PM -0700, Manish Mandlik wrote:
> From: Abhishek Pandit-Subedi <[email protected]>
>
> Add devcoredump APIs to hci core so that drivers only have to provide
> the dump skbs instead of managing the synchronization and timeouts.
>
> The devcoredump APIs should be used in the following manner:
> - hci_devcoredump_init is called to allocate the dump.
> - hci_devcoredump_append is called to append any skbs with dump data
> OR hci_devcoredump_append_pattern is called to insert a pattern.
> - hci_devcoredump_complete is called when all dump packets have been
> sent OR hci_devcoredump_abort is called to indicate an error and
> cancel an ongoing dump collection.
>
> The high level APIs just prepare some skbs with the appropriate data and
> queue it for the dump to process. Packets part of the crashdump can be
> intercepted in the driver in interrupt context and forwarded directly to
> the devcoredump APIs.
>
> Internally, there are 5 states for the dump: idle, active, complete,
> abort and timeout. A devcoredump will only be in active state after it
> has been initialized. Once active, it accepts data to be appended,
> patterns to be inserted (i.e. memset) and a completion event or an abort
> event to generate a devcoredump. The timeout is initialized at the same
> time the dump is initialized (defaulting to 10s) and will be cleared
> either when the timeout occurs or the dump is complete or aborted.
>
> Signed-off-by: Abhishek Pandit-Subedi <[email protected]>
> Signed-off-by: Manish Mandlik <[email protected]>
> Reviewed-by: Abhishek Pandit-Subedi <[email protected]>
As it looks like you'll need to respin [1]
[1] https://lore.kernel.org/oe-kbuild-all/[email protected]/
> +void hci_devcd_handle_pkt_pattern(struct hci_dev *hdev, struct sk_buff *skb)
> +{
> + struct hci_devcoredump_skb_pattern *pattern;
> +
> + if (hdev->dump.state != HCI_DEVCOREDUMP_ACTIVE) {
> + DBG_UNEXPECTED_STATE();
> + return;
> + }
> +
> + if (skb->len != sizeof(*pattern)) {
> + bt_dev_dbg(hdev, "Invalid pattern skb");
> + return;
> + }
> +
> + pattern = skb_pull_data(skb, sizeof(*pattern));;
nit: s/;;/;/
> +
> + if (!hci_devcd_memset(hdev, pattern->pattern, pattern->len))
> + bt_dev_dbg(hdev, "Failed to set pattern");
> +}
...