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| author | Zeng Chi <zengchi@kylinos.cn> | 2026-09-21 18:24:42 +0800 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2026-09-22 08:36:16 -0700 |
| commit | 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d (patch) | |
| tree | 660d50d4139cb750fbde1ae3432452c20726c99d /Documentation/ABI/testing/sysfs-class-rapidio | |
| download | linux-stable-119e9db233ad0f4cbd4cfb9f9385a7bca378b37d.tar.gz linux-stable-119e9db233ad0f4cbd4cfb9f9385a7bca378b37d.zip | |
KVM: Don't pre-reserve xarray entries when storing empty/NULL attributesgrafted
Skip the xarray reservation loop when clearing all memory attributes, as
storing NULL only erases the entry and never needs to allocate, so no
reservation (and no cleanup of a failed one) is required in that case.
Suggested-by: Sean Christopherson <seanjc@google.com>
Cc: David Ballesteros <davimaba.v@proton.me>
Signed-off-by: Zeng Chi <zengchi@kylinos.cn>
Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com
[sean: split to separate patch]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-rapidio')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-rapidio | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-rapidio b/Documentation/ABI/testing/sysfs-class-rapidio new file mode 100644 index 000000000..81e091455 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-rapidio @@ -0,0 +1,59 @@ +What: /sys/class/rapidio_port +Description: + On-chip RapidIO controllers and PCIe-to-RapidIO bridges + (referenced as "Master Port" or "mport") are presented in sysfs + as the special class of devices: "rapidio_port". + The /sys/class/rapidio_port subdirectory contains individual + subdirectories named as "rapidioN" where N = mport ID registered + with RapidIO subsystem. + + NOTE: An mport ID is not a RapidIO destination ID assigned to a + given local mport device. + +What: /sys/class/rapidio_port/rapidio<N>/sys_size +Date: Apr, 2014 +KernelVersion: v3.15 +Contact: Matt Porter <mporter@kernel.crashing.org>, + Alexandre Bounine <alexandre.bounine@idt.com> +Description: + (RO) reports RapidIO common transport system size: + + 0 = small (8-bit destination ID, max. 256 devices), + + 1 = large (16-bit destination ID, max. 65536 devices). + +What: /sys/class/rapidio_port/rapidio<N>/port_destid +Date: Apr, 2014 +KernelVersion: v3.15 +Contact: Matt Porter <mporter@kernel.crashing.org>, + Alexandre Bounine <alexandre.bounine@idt.com> +Description: + +(RO) reports RapidIO destination ID assigned to the given +RapidIO mport device. If value 0xFFFFFFFF is returned this means +that no valid destination ID have been assigned to the mport +(yet). Normally, before enumeration/discovery have been executed +only fabric enumerating mports have a valid destination ID +assigned to them using "hdid=..." rapidio module parameter. + +After enumeration or discovery was performed for a given mport device, +the corresponding subdirectory will also contain subdirectories for each +child RapidIO device connected to the mport. + +The example below shows mport device subdirectory with several child RapidIO +devices attached to it:: + + [rio@rapidio ~]$ ls /sys/class/rapidio_port/rapidio0/ -l + total 0 + drwxr-xr-x 3 root root 0 Feb 11 15:10 00:e:0001 + drwxr-xr-x 3 root root 0 Feb 11 15:10 00:e:0004 + drwxr-xr-x 3 root root 0 Feb 11 15:10 00:e:0007 + drwxr-xr-x 3 root root 0 Feb 11 15:10 00:s:0002 + drwxr-xr-x 3 root root 0 Feb 11 15:10 00:s:0003 + drwxr-xr-x 3 root root 0 Feb 11 15:10 00:s:0005 + lrwxrwxrwx 1 root root 0 Feb 11 15:11 device -> ../../../0000:01:00.0 + -r--r--r-- 1 root root 4096 Feb 11 15:11 port_destid + drwxr-xr-x 2 root root 0 Feb 11 15:11 power + lrwxrwxrwx 1 root root 0 Feb 11 15:04 subsystem -> ../../../../../../class/rapidio_port + -r--r--r-- 1 root root 4096 Feb 11 15:11 sys_size + -rw-r--r-- 1 root root 4096 Feb 11 15:04 uevent |