linux-kernel - [RFC PATCH v2 0/6] vfio: platform: reset: Introduce tegra234 mgbe reset module

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Message-ID: <20240917093851.990344-1-eric.auger@redhat.com>
Date: Tue, 17 Sep 2024 11:38:08 +0200
From: Eric Auger <eric.auger@...hat.com>
To: eric.auger.pro@...il.com,
	eric.auger@...hat.com,
	treding@...dia.com,
	vbhadram@...dia.com,
	jonathanh@...dia.com,
	mperttunen@...dia.com,
	linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org,
	alex.williamson@...hat.com,
	clg@...hat.com,
	alexandre.torgue@...s.st.com,
	joabreu@...opsys.com
Cc: msalter@...hat.com
Subject: [RFC PATCH v2 0/6] vfio: platform: reset: Introduce tegra234 mgbe reset module

We introduce a new vfio platform reset module for the tegra234
Multi-Gigabit Ethernet (MGBE).

This reset driver is more complex than previous ones because some
resources need to be prepared and released (clocks and reset). The
existing infrastructure was too simplistic to do that. So this series
extends the original single reset function to an ops struct enhanced
with optional init/release callbacks.

There the reset and clocks are handled. the callbacks are called
respectively on vfio_platform_init/release_common().

The actual reset toggles the mac reset, disable mac interrupts,
stop DMA requests and do a SW reset.

The reset code is inspired of the native driver:
net/ethernet/stmicro/stmmac/dwxgmac2_dma.c and
net/ethernet/stmicro/stmmac/dwmac-tegra.c

This series can be found at:
https://github.com/eauger/linux/tree/tegra234-mgbe-reset-module-rfc-v2

The qemu series to test with can be found at
https://github.com/eauger/qemu/tree/tegra234-mgbe-rfc

Best Regards

Eric

---

History:
v1 -> v2:
- rename reset_ops into of_reset_ops
- Move region initialization to vfio_platform_init_common
- Use init/release of_reset_ops callbacks instead of open/close


Eric Auger (6):
  vfio_platform: Introduce vfio_platform_get_region helper
  vfio_platform: reset: Prepare for additional reset ops
  vfio-platform: Move region initialization to vfio_platform_init_common
  vfio_platform: reset: Introduce new init and release callbacks
  vfio-platform: Add a new handle to store reset data
  vfio/platform: Add tegra234-mgbe vfio platform reset module

 drivers/vfio/platform/reset/Kconfig           |   7 +
 drivers/vfio/platform/reset/Makefile          |   2 +
 .../platform/reset/vfio_platform_amdxgbe.c    |   7 +-
 .../reset/vfio_platform_calxedaxgmac.c        |   7 +-
 .../reset/vfio_platform_tegra234_mgbe.c       | 234 ++++++++++++++++++
 drivers/vfio/platform/vfio_platform_common.c  |  88 +++++--
 drivers/vfio/platform/vfio_platform_private.h |  43 +++-
 7 files changed, 349 insertions(+), 39 deletions(-)
 create mode 100644 drivers/vfio/platform/reset/vfio_platform_tegra234_mgbe.c

-- 
2.41.0