linux-kernel - [PATCH 2/5] drm/panfrost: Introduce uAPI for JM context creation

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Message-ID: <20250828023422.2404784-3-adrian.larumbe@collabora.com>
Date: Thu, 28 Aug 2025 03:34:05 +0100
From: Adrián Larumbe <adrian.larumbe@...labora.com>
To: linux-kernel@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org,
	Boris Brezillon <boris.brezillon@...labora.com>,
	kernel@...labora.com,
	Adrián Larumbe <adrian.larumbe@...labora.com>,
	Rob Herring <robh@...nel.org>,
	Steven Price <steven.price@....com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>
Subject: [PATCH 2/5] drm/panfrost: Introduce uAPI for JM context creation

From: Boris Brezillon <boris.brezillon@...labora.com>

The new uAPI lets user space query the KM driver for the available
priorities a job can be given at submit time. These are managed through
the notion of a context, which besides a priority, codifies the list
of L2 caches, shading cores and tiler units a job is allowed to use,
for all three of the available device job slots.

Signed-off-by: Boris Brezillon <boris.brezillon@...labora.com>
Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
---
 include/uapi/drm/panfrost_drm.h | 93 +++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)

diff --git a/include/uapi/drm/panfrost_drm.h b/include/uapi/drm/panfrost_drm.h
index ed67510395bd..2d8b32448e68 100644
--- a/include/uapi/drm/panfrost_drm.h
+++ b/include/uapi/drm/panfrost_drm.h
@@ -22,6 +22,8 @@ extern "C" {
 #define DRM_PANFROST_PERFCNT_DUMP		0x07
 #define DRM_PANFROST_MADVISE			0x08
 #define DRM_PANFROST_SET_LABEL_BO		0x09
+#define DRM_PANFROST_JM_CTX_CREATE		0x0a
+#define DRM_PANFROST_JM_CTX_DESTROY		0x0b
 
 #define DRM_IOCTL_PANFROST_SUBMIT		DRM_IOW(DRM_COMMAND_BASE + DRM_PANFROST_SUBMIT, struct drm_panfrost_submit)
 #define DRM_IOCTL_PANFROST_WAIT_BO		DRM_IOW(DRM_COMMAND_BASE + DRM_PANFROST_WAIT_BO, struct drm_panfrost_wait_bo)
@@ -31,6 +33,8 @@ extern "C" {
 #define DRM_IOCTL_PANFROST_GET_BO_OFFSET	DRM_IOWR(DRM_COMMAND_BASE + DRM_PANFROST_GET_BO_OFFSET, struct drm_panfrost_get_bo_offset)
 #define DRM_IOCTL_PANFROST_MADVISE		DRM_IOWR(DRM_COMMAND_BASE + DRM_PANFROST_MADVISE, struct drm_panfrost_madvise)
 #define DRM_IOCTL_PANFROST_SET_LABEL_BO		DRM_IOWR(DRM_COMMAND_BASE + DRM_PANFROST_SET_LABEL_BO, struct drm_panfrost_set_label_bo)
+#define DRM_IOCTL_PANFROST_JM_CTX_CREATE	DRM_IOWR(DRM_COMMAND_BASE + DRM_PANFROST_JM_CTX_CREATE, struct drm_panfrost_jm_ctx_create)
+#define DRM_IOCTL_PANFROST_JM_CTX_DESTROY	DRM_IOWR(DRM_COMMAND_BASE + DRM_PANFROST_JM_CTX_DESTROY, struct drm_panfrost_jm_ctx_destroy)
 
 /*
  * Unstable ioctl(s): only exposed when the unsafe unstable_ioctls module
@@ -71,6 +75,12 @@ struct drm_panfrost_submit {
 
 	/** A combination of PANFROST_JD_REQ_* */
 	__u32 requirements;
+
+	/** JM context handle. Zero if you want to use the default context. */
+	__u32 jm_ctx_handle;
+
+	/** Padding field. MBZ. */
+	__u32 pad;
 };
 
 /**
@@ -177,6 +187,7 @@ enum drm_panfrost_param {
 	DRM_PANFROST_PARAM_AFBC_FEATURES,
 	DRM_PANFROST_PARAM_SYSTEM_TIMESTAMP,
 	DRM_PANFROST_PARAM_SYSTEM_TIMESTAMP_FREQUENCY,
+	DRM_PANFROST_PARAM_ALLOWED_JM_CTX_PRIORITIES,
 };
 
 struct drm_panfrost_get_param {
@@ -299,6 +310,88 @@ struct panfrost_dump_registers {
 	__u32 value;
 };
 
+enum drm_panfrost_jm_ctx_priority {
+	/**
+	 * @PANFROST_JM_CTX_PRIORITY_LOW: Low priority context.
+	 */
+	PANFROST_JM_CTX_PRIORITY_LOW = 0,
+
+	/**
+	 * @PANFROST_JM_CTX_PRIORITY_MEDIUM: Medium priority context.
+	 */
+	PANFROST_JM_CTX_PRIORITY_MEDIUM,
+
+	/**
+	 * @PANFROST_JM_CTX_PRIORITY_HIGH: High priority context.
+	 *
+	 * Requires CAP_SYS_NICE or DRM_MASTER.
+	 */
+	PANFROST_JM_CTX_PRIORITY_HIGH,
+};
+
+#define PANFROST_JS_FLAG_ENABLED		(1 << 0)
+
+struct drm_panfrost_js_ctx_info {
+	/** @flags: Combination of PANFROST_JS_FLAG_xxx values */
+	__u32 flags;
+
+	/** @priority: Context priority (see enum drm_panfrost_jm_ctx_priority). */
+	__u8 priority;
+
+	/**
+	 * @tiler_mask: Mask encoding tiler units that can be used by the job slot
+	 *
+	 * When this field is zero, it means the tiler won't be used.
+	 *
+	 * The bits set here should also be set in drm_panthor_gpu_info::tiler_present.
+	 */
+	__u8 tiler_mask;
+
+	/**
+	 * @l2_mask: Mask encoding L2 caches that can be used by the job slot
+	 *
+	 * The bits set here should also be set in drm_panthor_gpu_info::l2_present.:
+	 */
+	__u16 l2_mask;
+
+	/**
+	 * @core_mask: Mask encoding cores that can be used by the job slot
+	 *
+	 * When this field is zero, it means the queue won't be used.
+	 *
+	 * The bits set here should also be set in drm_panthor_gpu_info::shader_present.
+	 */
+	__u64 core_mask;
+};
+
+struct drm_panfrost_jm_ctx_create {
+	/** @handle: Handle of the created JM context */
+	__u32 handle;
+
+	/** @pad: Padding field, MBZ. */
+	__u32 pad;
+
+	/**
+	 * @slots: Job slots
+	 *
+	 * This field must be greater than zero and less than 8 (only three slots
+	 * available).
+	 */
+	struct drm_panfrost_js_ctx_info slots[3];
+};
+
+struct drm_panfrost_jm_ctx_destroy {
+	/**
+	 * @handle: Handle of the JM context to destroy.
+	 *
+	 * Must be a valid context handle returned by DRM_IOCTL_PANTHOR_JM_CTX_CREATE.
+	 */
+	__u32 handle;
+
+	/** @pad: Padding field, MBZ. */
+	__u32 pad;
+};
+
 #if defined(__cplusplus)
 }
 #endif
-- 
2.50.0