linux-kernel - Re: [PATCH v2 0/5] Enable FLR for IDXD halt

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Message-ID: <0dd14adb-4dfb-462e-8e35-81982c519a61@intel.com>
Date: Mon, 2 Dec 2024 15:15:17 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: Fenghua Yu <fenghua.yu@...el.com>, Vinod Koul <vkoul@...nel.org>
Cc: dmaengine@...r.kernel.org, linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/5] Enable FLR for IDXD halt



On 11/22/24 4:30 PM, Fenghua Yu wrote:
> When IDXD device hits hardware errors, it enters halt state and triggers
> an interrupt to IDXD driver. Currently IDXD driver just prints an error
> message in the interrupt handler.
> 
> A better way to handle the interrupt is to do Function Level Reset (FLR)
> and recover the device's hardware and software configurations to its
> previous working state. The device and software can continue to run after
> the interrupt.
> 
> This series enables this FLR handling for IDXD device whose WQs are all
> user type. FLR handling for IDXD device whose WQs are kernel type
> will be implemented in a future series.

Reviewed-by: Dave Jiang <dave.jiang@...el.com>

For the series.

> 
> Change log:
> v2:
> - Patch 3: Call a free helper to free all saved configs (Dave Jiang).
> - Patch 3: Replace defined bitmap free function with existing
>   bitmpa_free().
> 
> v1:
> https://lore.kernel.org/lkml/20240705181519.4067507-1-fenghua.yu@intel.com/
> 
> Fenghua Yu (5):
>   dmaengine: idxd: Add idxd_pci_probe_alloc() helper
>   dmaengine: idxd: Binding and unbinding IDXD device and driver
>   dmaengine: idxd: Add idxd_device_config_save() and
>     idxd_device_config_restore() helpers
>   dmaengine: idxd: Refactor halt handler
>   dmaengine: idxd: Enable Function Level Reset (FLR) for halt
> 
>  drivers/dma/idxd/idxd.h |  13 ++
>  drivers/dma/idxd/init.c | 479 ++++++++++++++++++++++++++++++++++++----
>  drivers/dma/idxd/irq.c  |  85 ++++---
>  3 files changed, 507 insertions(+), 70 deletions(-)
>