linux-kernel - [RFC PATCH 0/4] drm/panthor: Add GPU specific initialization and feature detection

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Message-ID: <20241219170521.64879-1-karunika.choo@arm.com>
Date: Thu, 19 Dec 2024 17:05:17 +0000
From: Karunika Choo <karunika.choo@....com>
To: dri-devel@...ts.freedesktop.org
Cc: nd@....com,
	Boris Brezillon <boris.brezillon@...labora.com>,
	Steven Price <steven.price@....com>,
	Liviu Dudau <liviu.dudau@....com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 0/4] drm/panthor: Add GPU specific initialization and feature detection

This patchset attempts to define a HW abstraction framework with the
hopes of standardizing and simplifying the bring up of subsequent Mali
GPU support.

It provides abstractions to handle GPU register and register set changes,
IRQ name changes, and functional changes of subsequent GPUs based on the
architecture ID (comprised of arch_major, arch_minor and arch_rev), in
addition to arch-based feature detection.

Patch 1/4 adds 64-bit GPU register accessors with the intention of
simplifying a number of HW operations throughout the driver.

Patch 2/4 prepares the foundation for the HW abstraction layer by
providing parsing of the GPU_ID register to compose the architecture ID.
It also reduces the recurring use of MACROS throughout the driver to
parse stored register values, instead only parsing them once on
initialization while providing a common structure to access the parsed
properties.

Patch 3/4 implements the GPU specific initialization framework.

Patch 4/4 provides an example of feature detection by performing cache
flushes via the GPU_COMMAND register in place of the AS_COMMAND register
when a feature bit ise set.

Karunika Choo (4):
  drm/panthor: Add 64-bit register accessors
  drm/panthor: Add parsed gpu properties
  drm/panthor: Add gpu specific initialization framework
  drm/panthor: Use GPU_COMMAND.FLUSH_CACHES for cache maintenance

 drivers/gpu/drm/panthor/Makefile         |   2 +
 drivers/gpu/drm/panthor/panthor_device.c |  23 +-
 drivers/gpu/drm/panthor/panthor_device.h |  32 ++-
 drivers/gpu/drm/panthor/panthor_fw.c     |  31 ++-
 drivers/gpu/drm/panthor/panthor_gpu.c    | 274 +++++------------------
 drivers/gpu/drm/panthor/panthor_gpu.h    |   1 +
 drivers/gpu/drm/panthor/panthor_heap.c   |   6 +-
 drivers/gpu/drm/panthor/panthor_hw.c     |  97 ++++++++
 drivers/gpu/drm/panthor/panthor_hw.h     |  96 ++++++++
 drivers/gpu/drm/panthor/panthor_mmu.c    | 118 ++++++----
 drivers/gpu/drm/panthor/panthor_props.c  | 151 +++++++++++++
 drivers/gpu/drm/panthor/panthor_props.h  |  70 ++++++
 drivers/gpu/drm/panthor/panthor_regs.h   | 114 +++++++---
 drivers/gpu/drm/panthor/panthor_sched.c  |   7 +-
 14 files changed, 702 insertions(+), 320 deletions(-)
 create mode 100644 drivers/gpu/drm/panthor/panthor_hw.c
 create mode 100644 drivers/gpu/drm/panthor/panthor_hw.h
 create mode 100644 drivers/gpu/drm/panthor/panthor_props.c
 create mode 100644 drivers/gpu/drm/panthor/panthor_props.h

-- 
2.47.1