On 1/14/26 2:46 AM, Tomeu Vizoso wrote:
Some SoCs from Texas Instruments contain DSPs that can be used for
general compute tasks.
This driver provides a drm/accel UABI to userspace for submitting jobs
to the DSP cores and managing the input, output and intermediate memory.
Signed-off-by: Tomeu Vizoso <[email protected]>
---
Documentation/accel/thames/index.rst | 28 +++++
MAINTAINERS | 9 ++
drivers/accel/Kconfig | 1 +
drivers/accel/Makefile | 3 +-
drivers/accel/thames/Kconfig | 26 +++++
drivers/accel/thames/Makefile | 9 ++
drivers/accel/thames/thames_core.c | 155 ++++++++++++++++++++++++++
drivers/accel/thames/thames_core.h | 53 +++++++++
drivers/accel/thames/thames_device.c | 93 ++++++++++++++++
drivers/accel/thames/thames_device.h | 46 ++++++++
drivers/accel/thames/thames_drv.c | 155 ++++++++++++++++++++++++++
drivers/accel/thames/thames_drv.h | 21 ++++
drivers/accel/thames/thames_ipc.h | 204 +++++++++++++++++++++++++++++++++++
drivers/accel/thames/thames_rpmsg.c | 155 ++++++++++++++++++++++++++
drivers/accel/thames/thames_rpmsg.h | 27 +++++
15 files changed, 984 insertions(+), 1 deletion(-)
diff --git a/Documentation/accel/thames/index.rst
b/Documentation/accel/thames/index.rst
new file mode 100644
index
0000000000000000000000000000000000000000..ca8391031f226f7ef1dc210a356c86acbe126c6f
--- /dev/null
+++ b/Documentation/accel/thames/index.rst
@@ -0,0 +1,28 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+============================================================
+ accel/thames Driver for the C7x DSPs from Texas Instruments
+============================================================
+
+The accel/thames driver supports the C7x DSPs inside some Texas Instruments
SoCs
+such as the J722S. These can be used as accelerators for various workloads,
+including machine learning inference.
+
+This driver controls the power state of the hardware via :doc:`remoteproc
</staging/remoteproc>`
+and communicates with the firmware running on the DSP via :doc:`rpmsg_virtio
</staging/rpmsg_virtio>`.
+The kernel driver itself allocates buffers, manages contexts, and submits jobs
+to the DSP firmware. Buffers are mapped by the DSP itself using its MMU,
+providing memory isolation among different clients.
+
+The source code for the firmware running on the DSP is available at:
+https://gitlab.freedesktop.org/tomeu/thames_firmware/.
+
+Everything else is done in userspace, as a Gallium driver (also called thames)
+that is part of the Mesa3D project: https://docs.mesa3d.org/teflon.html
+
+If there is more than one core that advertises the same rpmsg_virtio service
+name, the driver will load balance jobs between them with drm-gpu-scheduler.
+
+Hardware currently supported:
+
+* J722S
diff --git a/MAINTAINERS b/MAINTAINERS
index
dc731d37c8feeff25613c59fe9c929927dadaa7e..a3fc809c797269d0792dfe5202cc1b49f6ff57e9
100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7731,6 +7731,15 @@ F:
Documentation/devicetree/bindings/npu/rockchip,rk3588-rknn-core.yaml
F: drivers/accel/rocket/
F: include/uapi/drm/rocket_accel.h
+DRM ACCEL DRIVER FOR TI C7x DSPS
+M: Tomeu Vizoso <[email protected]>
+L: [email protected]
+S: Supported
+T: git https://gitlab.freedesktop.org/drm/misc/kernel.git
+F: Documentation/accel/thames/
+F: drivers/accel/thames/
+F: include/uapi/drm/thames_accel.h
+
DRM COMPUTE ACCELERATORS DRIVERS AND FRAMEWORK
M: Oded Gabbay <[email protected]>
L: [email protected]
diff --git a/drivers/accel/Kconfig b/drivers/accel/Kconfig
index
bdf48ccafcf21b2fd685ec963e39e256196e6e17..cb49c71cd4e4a4220624f7041a75ba950a1a2ee1
100644
--- a/drivers/accel/Kconfig
+++ b/drivers/accel/Kconfig
@@ -30,5 +30,6 @@ source "drivers/accel/habanalabs/Kconfig"
source "drivers/accel/ivpu/Kconfig"
source "drivers/accel/qaic/Kconfig"
source "drivers/accel/rocket/Kconfig"
+source "drivers/accel/thames/Kconfig"
endif
diff --git a/drivers/accel/Makefile b/drivers/accel/Makefile
index
1d3a7251b950f39e2ae600a2fc07a3ef7e41831e..8472989cbe22746f1e7292d2401fa0f7424a6c15
100644
--- a/drivers/accel/Makefile
+++ b/drivers/accel/Makefile
@@ -5,4 +5,5 @@ obj-$(CONFIG_DRM_ACCEL_ARM_ETHOSU) += ethosu/
obj-$(CONFIG_DRM_ACCEL_HABANALABS) += habanalabs/
obj-$(CONFIG_DRM_ACCEL_IVPU) += ivpu/
obj-$(CONFIG_DRM_ACCEL_QAIC) += qaic/
-obj-$(CONFIG_DRM_ACCEL_ROCKET) += rocket/
\ No newline at end of file
+obj-$(CONFIG_DRM_ACCEL_ROCKET) += rocket/
+obj-$(CONFIG_DRM_ACCEL_THAMES) += thames/
\ No newline at end of file
diff --git a/drivers/accel/thames/Kconfig b/drivers/accel/thames/Kconfig
new file mode 100644
index
0000000000000000000000000000000000000000..50e0b6ac2a16a942ba8463333991f5b0161b99ac
--- /dev/null
+++ b/drivers/accel/thames/Kconfig
@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config DRM_ACCEL_THAMES
+ tristate "Thames (support for TI C7x DSP accelerators)"
+ depends on DRM_ACCEL
+ depends on TI_K3_R5_REMOTEPROC || COMPILE_TEST
COMPILE_TEST part shouldn't be needed here, TI_K3_R5_REMOTEPROC can be built
under COMPILE_TEST so TI_K3_R5_REMOTEPROC would just be enabled to test.
+ depends on RPMSG
+ depends on MMU
+ select DRM_SCHED
+ select DRM_GEM_SHMEM_HELPER
+ help
+ Choose this option if you have a Texas Instruments SoC that contains
+ C7x DSP cores that can be used as compute accelerators. This includes
+ SoCs such as the AM62A, J721E, J721S2, and J784S4.
+
+ The C7x DSP cores can be used for general-purpose compute acceleration
+ and are exposed through the DRM accel subsystem.
+
+ The interface exposed to userspace is described in
+ include/uapi/drm/thames_accel.h and is used by the Thames userspace
+ driver in Mesa3D.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called thames.
diff --git a/drivers/accel/thames/Makefile b/drivers/accel/thames/Makefile
new file mode 100644
index
0000000000000000000000000000000000000000..7ccd8204f0f5ea800f30e84b319f355be948109d
--- /dev/null
+++ b/drivers/accel/thames/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+obj-$(CONFIG_DRM_ACCEL_THAMES) := thames.o
+
+thames-y := \
+ thames_core.o \
+ thames_device.o \
+ thames_drv.o \
+ thames_rpmsg.o
diff --git a/drivers/accel/thames/thames_core.c
b/drivers/accel/thames/thames_core.c
new file mode 100644
index
0000000000000000000000000000000000000000..92af1d68063116bcfa28a33960cbe829029fc1bf
--- /dev/null
+++ b/drivers/accel/thames/thames_core.c
@@ -0,0 +1,155 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright 2026 Texas Instruments Incorporated - https://www.ti.com/ */
+
+#include "linux/remoteproc.h"
+#include <linux/dev_printk.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/completion.h>
+#include <linux/jiffies.h>
+#include <linux/rpmsg.h>
+
+#include "thames_core.h"
+#include "thames_device.h"
+#include "thames_rpmsg.h"
+
+/* Shift to convert bytes to megabytes (divide by 1048576) */
+#define THAMES_BYTES_TO_MB_SHIFT 20
Seems unused/unneeded.
[...]
+
+static const struct rpmsg_device_id thames_rpmsg_id_table[] = { { .name =
THAMES_SERVICE_NAME },
+ {} };
+
Some odd formatting here.
+static struct rpmsg_driver thames_rpmsg_driver = {
+ .drv = {
+ .name = "thames",
+ .owner = THIS_MODULE,
Above line shoulnd't be needed.
Andrew
