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When Hfi1 device is unresponsive, reading the RcvArrayCnt register will return all 1's. This value is then used to remap chip's RcvArray. The incorrect all ones value used in remapping RcvArray will cause warn on as shown by trace below: [<ffffffff81685eac>] dump_stack+0x19/0x1b [<ffffffff81085820>] warn_slowpath_common+0x70/0xb0 [<ffffffff810858bc>] warn_slowpath_fmt+0x5c/0x80 [<ffffffff81065c29>] __ioremap_caller+0x279/0x320 [<ffffffff8142873c>] ? _dev_info+0x6c/0x90 [<ffffffffa021d155>] ? hfi1_pcie_ddinit+0x1d5/0x330 [hfi1] [<ffffffff81065d62>] ioremap_wc+0x32/0x40 [<ffffffffa021d155>] hfi1_pcie_ddinit+0x1d5/0x330 [hfi1] [<ffffffffa0204851>] hfi1_init_dd+0x1d1/0x2440 [hfi1] [<ffffffff813503dc>] ? pci_write_config_word+0x1c/0x20 Read CCE revision register first to verify that WFR device is responsive. If the read return "all ones", bail out from init and fail the driver load. Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com> Signed-off-by: Kamenee Arumugam <kamenee.arumugam@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com> |
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| drivers | ||
| firmware | ||
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| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
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| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
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| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.