dmaengine: idxd: Enable Function Level Reset (FLR) for halt

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When DSA/IAA device hits a fatal error, the device enters a halt state.
The driver can reset the device depending on Reset Type required by
hardware to recover the device.

Supported Reset Types are:
0: Reset Device command
1: Function Level Reset (FLR)
2: Warm reset
3: Cold reset

Currently, the driver only supports Reset Type 0.

This patch adds support for FLR recovery Type 1. Before issuing a PCIe
FLR command, IDXD device and WQ states are saved. After the FLR command
execution, the device is recovered to its previous states, allowing
the user can continue using the device.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20241122233028.2762809-6-fenghua.yu@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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This commit is contained in:

Fenghua Yu 2024-11-22 15:30:28 -08:00 • committed by Vinod Koul

parent 3e114fa0fd

commit 98d187a989

2 changed files with 148 additions and 3 deletions

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123

drivers/dma/idxd/init.c

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28

drivers/dma/idxd/irq.c

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