Once we have recognized a device by PNP ID, declare support unconditionally on probe, and only check for DSMs in attach. We do this for these reasons: 1. PNP0D80 is de-facto a device supposed to hold DSMs related to suspend-to-idle, so we assume it cannot be used for other purposes. And if that changes, we need another architecture anyway (e.g., have a new driver claiming those devices and behaving like a bus, to which this driver would be a sub-driver). 2. If there are no DSMs that we support on such a device, then a new DSM was added that the driver does not know about and which "replaces" (in terms of functionality) the known ones, or the firmware is buggy. In both cases, failing the attach instead of the probe is reasonable, as that leads to printing some error which we (and probably users too) would like to know about. 3. This is a step to enable multiple instances of this driver (just to be a good citizen, and also to be future proof against weird firmwares that would, e.g., implement the Microsoft DSM on another device than the Intel one). Reviewed by: imp (older version), obiwac Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D56810
FreeBSD Source:
This is the top level of the FreeBSD source directory.
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For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.
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Source Roadmap:
| Directory | Description |
|---|---|
| bin | System/user commands. |
| cddl | Source code for third-party software under the Common Development and Distribution License. |
| contrib | Source code for third-party software. |
| crypto | Source code for cryptographic libraries and commands (see crypto/README). |
| etc | Template files for /etc. |
| gnu | Source code for third-party software under the GNU General Public License (GPL) or Lesser General Public License (LGPL). Please see gnu/COPYING and gnu/COPYING.LIB for more information. |
| include | System include files. |
| kerberos5 | Build system for Kerberos 5 (Heimdal). |
| krb5 | Build system for Kerberos 5 (MIT). |
| lib | System libraries. |
| libexec | System commands intended to be executed by other commands or daemons. |
| packages | Base system packages. |
| release | Makefiles and scripts used for building releases and VM images. |
| rescue | Build system for statically linked /rescue commands. |
| sbin | System commands. |
| secure | Build system for cryptographic libraries and commands (excluding Kerberos). |
| share | Shared resources. |
| stand | Boot loader sources. |
| sys | Kernel sources (see sys/README.md). |
| targets | Support for experimental DIRDEPS_BUILD |
| tests | Tests which can be run by Kyua. See tests/README for additional information. |
| tools | Ancillary utilities and tests (not included in the build). |
| usr.bin | User commands. |
| usr.sbin | System administration commands. |
For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see FreeBSD Handbook.