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Ben Widawsky
authored
The original driver implementation used the doorbell timeout for the Mailbox Interface Ready bit to piggy back off of, since the latter does not have a defined timeout. This functionality, introduced in commit 8adaf747 ("cxl/mem: Find device capabilities"), needs improvement as the recent "Add Mailbox Ready Time" ECN timeout indicates that the mailbox ready time can be significantly longer that 2 seconds. While the specification limits the maximum timeout to 256s, the cxl_pci driver gives up on the mailbox after 60s. This value corresponds with important timeout values already present in the kernel. A module parameter is provided as an emergency override and represents the default Linux policy for all devices. Signed-off-by:Ben Widawsky <ben.widawsky@intel.com> Reviewed-by:
Jonathan Cameron <Jonathan.Cameron@huawei.com> [djbw: add modparam, drop check_device_status()] Co-developed-by:
Dan Williams <dan.j.williams@intel.com> Link: https://lore.kernel.org/r/164367306565.208548.1932299464604450843.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by:
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