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| author | Dave Jiang <dave.jiang@intel.com> | 2023-04-07 22:31:41 +0200 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2023-04-12 19:48:46 +0200 |
| commit | 244009b07e7d0728726f266cc3485d7fd400d0d5 (patch) | |
| tree | 8c4e1f5c12db5c898d527cfb26e803155a397087 /Documentation/ABI/stable | |
| parent | dmaengine: idxd: add a device to represent the file opened (diff) | |
| download | linux-244009b07e7d0728726f266cc3485d7fd400d0d5.tar.xz linux-244009b07e7d0728726f266cc3485d7fd400d0d5.zip | |
dmaengine: idxd: expose fault counters to sysfs
Expose cr_faults and cr_fault_failures counters to the user space. This
allows a user app to keep track of how many fault the application is
causing with the completion record (CR) and also the number of failures
of the CR writeback. Having a high number of cr_fault_failures is bad as
the app is submitting descriptors with the CR addresses that are bad. User
monitoring daemon may want to consider killing the application as it may be
malicious and attempting to flood the device event log.
Tested-by: Tony Zhu <tony.zhu@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Co-developed-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Link: https://lore.kernel.org/r/20230407203143.2189681-15-fenghua.yu@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'Documentation/ABI/stable')
| -rw-r--r-- | Documentation/ABI/stable/sysfs-driver-dma-idxd | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-driver-dma-idxd b/Documentation/ABI/stable/sysfs-driver-dma-idxd index e01916611452..73ab86196a41 100644 --- a/Documentation/ABI/stable/sysfs-driver-dma-idxd +++ b/Documentation/ABI/stable/sysfs-driver-dma-idxd @@ -318,3 +318,20 @@ Description: Allows control of the number of batch descriptors that can be 1 (1/2 of max value), 2 (1/4 of the max value), and 3 (1/8 of the max value). It's visible only on platforms that support the capability. + +What: /sys/bus/dsa/devices/wq<m>.<n>/dsa<x>\!wq<m>.<n>/file<y>/cr_faults +Date: Sept 14, 2022 +KernelVersion: 6.4.0 +Contact: dmaengine@vger.kernel.org +Description: Show the number of Completion Record (CR) faults this application + has caused. + +What: /sys/bus/dsa/devices/wq<m>.<n>/dsa<x>\!wq<m>.<n>/file<y>/cr_fault_failures +Date: Sept 14, 2022 +KernelVersion: 6.4.0 +Contact: dmaengine@vger.kernel.org +Description: Show the number of Completion Record (CR) faults failures that this + application has caused. The failure counter is incremented when the + driver cannot fault in the address for the CR. Typically this is caused + by a bad address programmed in the submitted descriptor or a malicious + submitter is using bad CR address on purpose. |