[PATCH i-g-t v2 0/3] tests/panthor: Add more tests

[PATCH i-g-t v2 0/3] tests/panthor: Add more tests

[Boris Brezillon]

Hello,

Here's a bunch of tests that were developped while fixing different
bugs in panthor. I'm posting them before I forget.

v2:
- Add some docs
- Fix commit message

Regards,

Boris

Boris Brezillon (3):
  drm-uapi/panthor: Sync panthor uapi
  tests/panthor: Add a test to make sure the buffer is zeroed at alloc
    time
  tests/panthor: Add scheduler tests

 include/drm-uapi/panthor_drm.h | 213 +++++++++++++++++----
 lib/igt_panthor.c              |  71 +++++++
 lib/igt_panthor.h              |  76 ++++++++
 tests/panthor/meson.build      |   1 +
 tests/panthor/panthor_gem.c    |  11 ++
 tests/panthor/panthor_sched.c  | 338 +++++++++++++++++++++++++++++++++
 6 files changed, 668 insertions(+), 42 deletions(-)
 create mode 100644 tests/panthor/panthor_sched.c

-- 
2.51.1

[PATCH i-g-t v2 1/3] drm-uapi/panthor: Sync panthor uapi

[Boris Brezillon]

Align with kernel commit 3b1dc21d6d80 ("drm/panthor: Add support for
Mali-Gx15 family of GPUs"). Will be needed for the scheduler tests.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
---
 include/drm-uapi/panthor_drm.h | 213 ++++++++++++++++++++++++++-------
 1 file changed, 171 insertions(+), 42 deletions(-)

diff --git a/include/drm-uapi/panthor_drm.h b/include/drm-uapi/panthor_drm.h
index e23a7f9b0eac..467d365ed7ba 100644
--- a/include/drm-uapi/panthor_drm.h
+++ b/include/drm-uapi/panthor_drm.h
@@ -127,50 +127,25 @@ enum drm_panthor_ioctl_id {
 
 	/** @DRM_PANTHOR_TILER_HEAP_DESTROY: Destroy a tiler heap. */
 	DRM_PANTHOR_TILER_HEAP_DESTROY,
+
+	/** @DRM_PANTHOR_BO_SET_LABEL: Label a BO. */
+	DRM_PANTHOR_BO_SET_LABEL,
+
+	/**
+	 * @DRM_PANTHOR_SET_USER_MMIO_OFFSET: Set the offset to use as the user MMIO offset.
+	 *
+	 * The default behavior is to pick the MMIO offset based on the size of the pgoff_t
+	 * type seen by the process that manipulates the FD, such that a 32-bit process can
+	 * always map the user MMIO ranges. But this approach doesn't work well for emulators
+	 * like FEX, where the emulator is an 64-bit binary which might be executing 32-bit
+	 * code. In that case, the kernel thinks it's the 64-bit process and assumes
+	 * DRM_PANTHOR_USER_MMIO_OFFSET_64BIT is in use, but the UMD library expects
+	 * DRM_PANTHOR_USER_MMIO_OFFSET_32BIT, because it can't mmap() anything above the
+	 * pgoff_t size.
+	 */
+	DRM_PANTHOR_SET_USER_MMIO_OFFSET,
 };
 
-/**
- * DRM_IOCTL_PANTHOR() - Build a Panthor IOCTL number
- * @__access: Access type. Must be R, W or RW.
- * @__id: One of the DRM_PANTHOR_xxx id.
- * @__type: Suffix of the type being passed to the IOCTL.
- *
- * Don't use this macro directly, use the DRM_IOCTL_PANTHOR_xxx
- * values instead.
- *
- * Return: An IOCTL number to be passed to ioctl() from userspace.
- */
-#define DRM_IOCTL_PANTHOR(__access, __id, __type) \
-	DRM_IO ## __access(DRM_COMMAND_BASE + DRM_PANTHOR_ ## __id, \
-			   struct drm_panthor_ ## __type)
-
-#define DRM_IOCTL_PANTHOR_DEV_QUERY \
-	DRM_IOCTL_PANTHOR(WR, DEV_QUERY, dev_query)
-#define DRM_IOCTL_PANTHOR_VM_CREATE \
-	DRM_IOCTL_PANTHOR(WR, VM_CREATE, vm_create)
-#define DRM_IOCTL_PANTHOR_VM_DESTROY \
-	DRM_IOCTL_PANTHOR(WR, VM_DESTROY, vm_destroy)
-#define DRM_IOCTL_PANTHOR_VM_BIND \
-	DRM_IOCTL_PANTHOR(WR, VM_BIND, vm_bind)
-#define DRM_IOCTL_PANTHOR_VM_GET_STATE \
-	DRM_IOCTL_PANTHOR(WR, VM_GET_STATE, vm_get_state)
-#define DRM_IOCTL_PANTHOR_BO_CREATE \
-	DRM_IOCTL_PANTHOR(WR, BO_CREATE, bo_create)
-#define DRM_IOCTL_PANTHOR_BO_MMAP_OFFSET \
-	DRM_IOCTL_PANTHOR(WR, BO_MMAP_OFFSET, bo_mmap_offset)
-#define DRM_IOCTL_PANTHOR_GROUP_CREATE \
-	DRM_IOCTL_PANTHOR(WR, GROUP_CREATE, group_create)
-#define DRM_IOCTL_PANTHOR_GROUP_DESTROY \
-	DRM_IOCTL_PANTHOR(WR, GROUP_DESTROY, group_destroy)
-#define DRM_IOCTL_PANTHOR_GROUP_SUBMIT \
-	DRM_IOCTL_PANTHOR(WR, GROUP_SUBMIT, group_submit)
-#define DRM_IOCTL_PANTHOR_GROUP_GET_STATE \
-	DRM_IOCTL_PANTHOR(WR, GROUP_GET_STATE, group_get_state)
-#define DRM_IOCTL_PANTHOR_TILER_HEAP_CREATE \
-	DRM_IOCTL_PANTHOR(WR, TILER_HEAP_CREATE, tiler_heap_create)
-#define DRM_IOCTL_PANTHOR_TILER_HEAP_DESTROY \
-	DRM_IOCTL_PANTHOR(WR, TILER_HEAP_DESTROY, tiler_heap_destroy)
-
 /**
  * DOC: IOCTL arguments
  */
@@ -260,6 +235,14 @@ enum drm_panthor_dev_query_type {
 
 	/** @DRM_PANTHOR_DEV_QUERY_CSIF_INFO: Query command-stream interface information. */
 	DRM_PANTHOR_DEV_QUERY_CSIF_INFO,
+
+	/** @DRM_PANTHOR_DEV_QUERY_TIMESTAMP_INFO: Query timestamp information. */
+	DRM_PANTHOR_DEV_QUERY_TIMESTAMP_INFO,
+
+	/**
+	 * @DRM_PANTHOR_DEV_QUERY_GROUP_PRIORITIES_INFO: Query allowed group priorities information.
+	 */
+	DRM_PANTHOR_DEV_QUERY_GROUP_PRIORITIES_INFO,
 };
 
 /**
@@ -327,6 +310,9 @@ struct drm_panthor_gpu_info {
 	/** @as_present: Bitmask encoding the number of address-space exposed by the MMU. */
 	__u32 as_present;
 
+	/** @pad0: MBZ. */
+	__u32 pad0;
+
 	/** @shader_present: Bitmask encoding the shader cores exposed by the GPU. */
 	__u64 shader_present;
 
@@ -341,6 +327,9 @@ struct drm_panthor_gpu_info {
 
 	/** @pad: MBZ. */
 	__u32 pad;
+
+	/** @gpu_features: Bitmask describing supported GPU-wide features */
+	__u64 gpu_features;
 };
 
 /**
@@ -377,6 +366,42 @@ struct drm_panthor_csif_info {
 	__u32 pad;
 };
 
+/**
+ * struct drm_panthor_timestamp_info - Timestamp information
+ *
+ * Structure grouping all queryable information relating to the GPU timestamp.
+ */
+struct drm_panthor_timestamp_info {
+	/**
+	 * @timestamp_frequency: The frequency of the timestamp timer or 0 if
+	 * unknown.
+	 */
+	__u64 timestamp_frequency;
+
+	/** @current_timestamp: The current timestamp. */
+	__u64 current_timestamp;
+
+	/** @timestamp_offset: The offset of the timestamp timer. */
+	__u64 timestamp_offset;
+};
+
+/**
+ * struct drm_panthor_group_priorities_info - Group priorities information
+ *
+ * Structure grouping all queryable information relating to the allowed group priorities.
+ */
+struct drm_panthor_group_priorities_info {
+	/**
+	 * @allowed_mask: Bitmask of the allowed group priorities.
+	 *
+	 * Each bit represents a variant of the enum drm_panthor_group_priority.
+	 */
+	__u8 allowed_mask;
+
+	/** @pad: Padding fields, MBZ. */
+	__u8 pad[3];
+};
+
 /**
  * struct drm_panthor_dev_query - Arguments passed to DRM_PANTHOR_IOCTL_DEV_QUERY
  */
@@ -698,6 +723,13 @@ enum drm_panthor_group_priority {
 	 * Requires CAP_SYS_NICE or DRM_MASTER.
 	 */
 	PANTHOR_GROUP_PRIORITY_HIGH,
+
+	/**
+	 * @PANTHOR_GROUP_PRIORITY_REALTIME: Realtime priority group.
+	 *
+	 * Requires CAP_SYS_NICE or DRM_MASTER.
+	 */
+	PANTHOR_GROUP_PRIORITY_REALTIME,
 };
 
 /**
@@ -872,6 +904,15 @@ enum drm_panthor_group_state_flags {
 	 * When a group ends up with this flag set, no jobs can be submitted to its queues.
 	 */
 	DRM_PANTHOR_GROUP_STATE_FATAL_FAULT = 1 << 1,
+
+	/**
+	 * @DRM_PANTHOR_GROUP_STATE_INNOCENT: Group was killed during a reset caused by other
+	 * groups.
+	 *
+	 * This flag can only be set if DRM_PANTHOR_GROUP_STATE_TIMEDOUT is set and
+	 * DRM_PANTHOR_GROUP_STATE_FATAL_FAULT is not.
+	 */
+	DRM_PANTHOR_GROUP_STATE_INNOCENT = 1 << 2,
 };
 
 /**
@@ -959,6 +1000,94 @@ struct drm_panthor_tiler_heap_destroy {
 	__u32 pad;
 };
 
+/**
+ * struct drm_panthor_bo_set_label - Arguments passed to DRM_IOCTL_PANTHOR_BO_SET_LABEL
+ */
+struct drm_panthor_bo_set_label {
+	/** @handle: Handle of the buffer object to label. */
+	__u32 handle;
+
+	/**  @pad: MBZ. */
+	__u32 pad;
+
+	/**
+	 * @label: User pointer to a NUL-terminated string
+	 *
+	 * Length cannot be greater than 4096
+	 */
+	__u64 label;
+};
+
+/**
+ * struct drm_panthor_set_user_mmio_offset - Arguments passed to
+ * DRM_IOCTL_PANTHOR_SET_USER_MMIO_OFFSET
+ *
+ * This ioctl is only really useful if you want to support userspace
+ * CPU emulation environments where the size of an unsigned long differs
+ * between the host and the guest architectures.
+ */
+struct drm_panthor_set_user_mmio_offset {
+	/**
+	 * @offset: User MMIO offset to use.
+	 *
+	 * Must be either DRM_PANTHOR_USER_MMIO_OFFSET_32BIT or
+	 * DRM_PANTHOR_USER_MMIO_OFFSET_64BIT.
+	 *
+	 * Use DRM_PANTHOR_USER_MMIO_OFFSET (which selects OFFSET_32BIT or
+	 * OFFSET_64BIT based on the size of an unsigned long) unless you
+	 * have a very good reason to overrule this decision.
+	 */
+	__u64 offset;
+};
+
+/**
+ * DRM_IOCTL_PANTHOR() - Build a Panthor IOCTL number
+ * @__access: Access type. Must be R, W or RW.
+ * @__id: One of the DRM_PANTHOR_xxx id.
+ * @__type: Suffix of the type being passed to the IOCTL.
+ *
+ * Don't use this macro directly, use the DRM_IOCTL_PANTHOR_xxx
+ * values instead.
+ *
+ * Return: An IOCTL number to be passed to ioctl() from userspace.
+ */
+#define DRM_IOCTL_PANTHOR(__access, __id, __type) \
+	DRM_IO ## __access(DRM_COMMAND_BASE + DRM_PANTHOR_ ## __id, \
+			   struct drm_panthor_ ## __type)
+
+enum {
+	DRM_IOCTL_PANTHOR_DEV_QUERY =
+		DRM_IOCTL_PANTHOR(WR, DEV_QUERY, dev_query),
+	DRM_IOCTL_PANTHOR_VM_CREATE =
+		DRM_IOCTL_PANTHOR(WR, VM_CREATE, vm_create),
+	DRM_IOCTL_PANTHOR_VM_DESTROY =
+		DRM_IOCTL_PANTHOR(WR, VM_DESTROY, vm_destroy),
+	DRM_IOCTL_PANTHOR_VM_BIND =
+		DRM_IOCTL_PANTHOR(WR, VM_BIND, vm_bind),
+	DRM_IOCTL_PANTHOR_VM_GET_STATE =
+		DRM_IOCTL_PANTHOR(WR, VM_GET_STATE, vm_get_state),
+	DRM_IOCTL_PANTHOR_BO_CREATE =
+		DRM_IOCTL_PANTHOR(WR, BO_CREATE, bo_create),
+	DRM_IOCTL_PANTHOR_BO_MMAP_OFFSET =
+		DRM_IOCTL_PANTHOR(WR, BO_MMAP_OFFSET, bo_mmap_offset),
+	DRM_IOCTL_PANTHOR_GROUP_CREATE =
+		DRM_IOCTL_PANTHOR(WR, GROUP_CREATE, group_create),
+	DRM_IOCTL_PANTHOR_GROUP_DESTROY =
+		DRM_IOCTL_PANTHOR(WR, GROUP_DESTROY, group_destroy),
+	DRM_IOCTL_PANTHOR_GROUP_SUBMIT =
+		DRM_IOCTL_PANTHOR(WR, GROUP_SUBMIT, group_submit),
+	DRM_IOCTL_PANTHOR_GROUP_GET_STATE =
+		DRM_IOCTL_PANTHOR(WR, GROUP_GET_STATE, group_get_state),
+	DRM_IOCTL_PANTHOR_TILER_HEAP_CREATE =
+		DRM_IOCTL_PANTHOR(WR, TILER_HEAP_CREATE, tiler_heap_create),
+	DRM_IOCTL_PANTHOR_TILER_HEAP_DESTROY =
+		DRM_IOCTL_PANTHOR(WR, TILER_HEAP_DESTROY, tiler_heap_destroy),
+	DRM_IOCTL_PANTHOR_BO_SET_LABEL =
+		DRM_IOCTL_PANTHOR(WR, BO_SET_LABEL, bo_set_label),
+	DRM_IOCTL_PANTHOR_SET_USER_MMIO_OFFSET =
+		DRM_IOCTL_PANTHOR(WR, SET_USER_MMIO_OFFSET, set_user_mmio_offset),
+};
+
 #if defined(__cplusplus)
 }
 #endif
-- 
2.51.1

[PATCH i-g-t v2 2/3] tests/panthor: Add a test to make sure the buffer is zeroed at alloc time

[Boris Brezillon]

This covering for this bug [1]. Add an IGT test to make sure we don't
hit that again.

[1]https://lore.kernel.org/20251107171214.1186299-1-boris.brezillon@collabora.com

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
---
 tests/panthor/panthor_gem.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tests/panthor/panthor_gem.c b/tests/panthor/panthor_gem.c
index 57cd97e809fd..1566c713f876 100644
--- a/tests/panthor/panthor_gem.c
+++ b/tests/panthor/panthor_gem.c
@@ -66,6 +66,17 @@ igt_main {
 		igt_panthor_free_bo(fd, &bo);
 	}
 
+	igt_describe_f("Check zero-ing of buffer at creation time");
+	igt_subtest("bo_zeroed") {
+		struct panthor_bo bo;
+
+		igt_panthor_bo_create_mapped(fd, &bo, getpagesize(), 0, 0);
+		igt_assert(bo.map);
+		igt_assert_eq(*((uint32_t *)bo.map), 0);
+
+		igt_panthor_free_bo(fd, &bo);
+	}
+
 	igt_fixture {
 		drm_close_driver(fd);
 	}
-- 
2.51.1

Re: [PATCH i-g-t v2 2/3] tests/panthor: Add a test to make sure the buffer is zeroed at alloc time

[Kamil Konieczny]

Hi Boris,
On 2025-11-28 at 10:38:57 +0100, Boris Brezillon wrote:
> This covering for this bug [1]. Add an IGT test to make sure we don't
> hit that again.
> 
> [1]https://lore.kernel.org/20251107171214.1186299-1-boris.brezillon@collabora.com
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
> Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
> Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>

I merged 1/3 and this one,

Regards,
Kamil

> ---
>  tests/panthor/panthor_gem.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/tests/panthor/panthor_gem.c b/tests/panthor/panthor_gem.c
> index 57cd97e809fd..1566c713f876 100644
> --- a/tests/panthor/panthor_gem.c
> +++ b/tests/panthor/panthor_gem.c
> @@ -66,6 +66,17 @@ igt_main {
>  		igt_panthor_free_bo(fd, &bo);
>  	}
>  
> +	igt_describe_f("Check zero-ing of buffer at creation time");
> +	igt_subtest("bo_zeroed") {
> +		struct panthor_bo bo;
> +
> +		igt_panthor_bo_create_mapped(fd, &bo, getpagesize(), 0, 0);
> +		igt_assert(bo.map);
> +		igt_assert_eq(*((uint32_t *)bo.map), 0);
> +
> +		igt_panthor_free_bo(fd, &bo);
> +	}
> +
>  	igt_fixture {
>  		drm_close_driver(fd);
>  	}
> -- 
> 2.51.1
> 

Re: [PATCH i-g-t v2 2/3] tests/panthor: Add a test to make sure the buffer is zeroed at alloc time

[Daniel Almeida]

Hi Kamil,

> On 1 Dec 2025, at 08:14, Kamil Konieczny <kamil.konieczny@linux.intel.com> wrote:
> 
> Hi Boris,
> On 2025-11-28 at 10:38:57 +0100, Boris Brezillon wrote:
>> This covering for this bug [1]. Add an IGT test to make sure we don't
>> hit that again.
>> 
>> [1]https://lore.kernel.org/20251107171214.1186299-1-boris.brezillon@collabora.com
>> 
>> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
>> Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
>> Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
> 
> I merged 1/3 and this one,
> 
> Regards,
> Kamil
> 

I’ll have a look on 2/3 today.

— Daniel

Re: [PATCH i-g-t v2 2/3] tests/panthor: Add a test to make sure the buffer is zeroed at alloc time

[Kamil Konieczny]

Hi Daniel,
On 2025-12-01 at 10:25:06 -0300, Daniel Almeida wrote:
> Hi Kamil,
> 
> > On 1 Dec 2025, at 08:14, Kamil Konieczny <kamil.konieczny@linux.intel.com> wrote:
> > 
> > Hi Boris,
> > On 2025-11-28 at 10:38:57 +0100, Boris Brezillon wrote:
> >> This covering for this bug [1]. Add an IGT test to make sure we don't
> >> hit that again.
> >> 
> >> [1]https://lore.kernel.org/20251107171214.1186299-1-boris.brezillon@collabora.com
> >> 
> >> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
> >> Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
> >> Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
> > 
> > I merged 1/3 and this one,
> > 
> > Regards,
> > Kamil
> > 
> 
> I’ll have a look on 2/3 today.

I merged 1/3 and 2/3, did you mean last one 3/3?

Regards,
Kamil

> 
> — Daniel
> 

Re: [PATCH i-g-t v2 2/3] tests/panthor: Add a test to make sure the buffer is zeroed at alloc time

[Daniel Almeida]

> On 1 Dec 2025, at 12:19, Kamil Konieczny <kamil.konieczny@linux.intel.com> wrote:
> 
> Hi Daniel,
> On 2025-12-01 at 10:25:06 -0300, Daniel Almeida wrote:
>> Hi Kamil,
>> 
>>> On 1 Dec 2025, at 08:14, Kamil Konieczny <kamil.konieczny@linux.intel.com> wrote:
>>> 
>>> Hi Boris,
>>> On 2025-11-28 at 10:38:57 +0100, Boris Brezillon wrote:
>>>> This covering for this bug [1]. Add an IGT test to make sure we don't
>>>> hit that again.
>>>> 
>>>> [1]https://lore.kernel.org/20251107171214.1186299-1-boris.brezillon@collabora.com
>>>> 
>>>> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
>>>> Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
>>>> Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
>>> 
>>> I merged 1/3 and this one,
>>> 
>>> Regards,
>>> Kamil
>>> 
>> 
>> I’ll have a look on 2/3 today.
> 
> I merged 1/3 and 2/3, did you mean last one 3/3?
> 
> Regards,
> Kamil
> 
>> 
>> — Daniel

Yes, the last one, sorry.

— Daniel

[PATCH i-g-t v2 3/3] tests/panthor: Add scheduler tests

[Boris Brezillon]

Tests developed while working on this set of fixes [1].

[1]https://lore.kernel.org/all/20251112115142.1270931-1-boris.brezillon@collabora.com/

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
 lib/igt_panthor.c             |  71 +++++++
 lib/igt_panthor.h             |  76 ++++++++
 tests/panthor/meson.build     |   1 +
 tests/panthor/panthor_sched.c | 338 ++++++++++++++++++++++++++++++++++
 4 files changed, 486 insertions(+)
 create mode 100644 tests/panthor/panthor_sched.c

diff --git a/lib/igt_panthor.c b/lib/igt_panthor.c
index 73ada9c59bfc..802cb182753c 100644
--- a/lib/igt_panthor.c
+++ b/lib/igt_panthor.c
@@ -2,6 +2,7 @@
 // SPDX-FileCopyrightText: Copyright (C) 2025 Collabora Ltd.
 
 #include "drmtest.h"
+#include "igt_aux.h"
 #include "igt_panthor.h"
 #include "ioctl_wrappers.h"
 #include "panthor_drm.h"
@@ -370,3 +371,73 @@ void igt_panthor_free_bo(int fd, struct panthor_bo *bo)
 
 	gem_close(fd, bo->handle);
 }
+
+/**
+ * igt_panthor_ctx_create:
+ * @fd: panthor device file descriptor
+ * @ctx: context to initialize
+ *
+ * Creates base resources (VM and GPU info) needed for GPU job submission
+ */
+void igt_panthor_ctx_create(int fd, struct panthor_ctx *ctx)
+{
+	memset(ctx, 0, sizeof(*ctx));
+	igt_panthor_query(fd, DRM_PANTHOR_DEV_QUERY_GPU_INFO,
+			  &ctx->gpu_info, sizeof(ctx->gpu_info), 0);
+	igt_panthor_vm_create(fd, &ctx->vm, 0);
+}
+
+/**
+ * igt_panthor_ctx_destroy:
+ * @fd: panthor device file descriptor
+ * @ctx: context to cleanup
+ *
+ * Releases all the resources attached to a GPU context.
+ */
+void igt_panthor_ctx_destroy(int fd, struct panthor_ctx *ctx)
+{
+	for (uint32_t i = 0; i < ctx->group_count; i++) {
+		struct drm_panthor_group_destroy group_destroy = {
+			.group_handle = ctx->groups[i],
+		};
+
+		igt_assert_eq(igt_ioctl(fd, DRM_IOCTL_PANTHOR_GROUP_DESTROY, &group_destroy), 0);
+	}
+
+	igt_panthor_vm_destroy(fd, ctx->vm, 0);
+}
+
+/**
+ * igt_panthor_ctx_add_group:
+ * @fd: panthor device file descriptor
+ * @ctx: context to add a group to
+ * @group_prio: group priority
+ * @queues: properties of queues attached to the group
+ * @queue_count: number of queues attached to the group
+ *
+ * Adds a group to a GPU context. Such groups will be released when
+ * the context is destroyed.
+ */
+void igt_panthor_ctx_add_group(int fd, struct panthor_ctx *ctx,
+			       enum drm_panthor_group_priority group_prio,
+			       const struct drm_panthor_queue_create *queues,
+			       uint32_t queue_count)
+{
+	unsigned int shader_core_count = igt_hweight(ctx->gpu_info.shader_present);
+	struct drm_panthor_group_create group_create = {
+		.queues = DRM_PANTHOR_OBJ_ARRAY(queue_count, queues),
+		.max_compute_cores = shader_core_count,
+		.max_fragment_cores = shader_core_count,
+		.max_tiler_cores = 1,
+		.priority = group_prio,
+		.compute_core_mask = ctx->gpu_info.shader_present,
+		.fragment_core_mask = ctx->gpu_info.shader_present,
+		.tiler_core_mask = ctx->gpu_info.tiler_present,
+		.vm_id = ctx->vm,
+	};
+
+	igt_assert(ctx->group_count < ARRAY_SIZE(ctx->groups));
+	igt_assert_eq(igt_ioctl(fd, DRM_IOCTL_PANTHOR_GROUP_CREATE, &group_create), 0);
+	igt_assert(group_create.group_handle > 0);
+	ctx->groups[ctx->group_count++] = group_create.group_handle;
+}
diff --git a/lib/igt_panthor.h b/lib/igt_panthor.h
index dc90033c0ad4..2a62eff37b2b 100644
--- a/lib/igt_panthor.h
+++ b/lib/igt_panthor.h
@@ -7,6 +7,7 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <stdbool.h>
+
 #include "panthor_drm.h"
 
 struct panthor_bo {
@@ -16,7 +17,17 @@ struct panthor_bo {
 	void *map;
 };
 
+#define MAX_GROUPS_PER_CTX	128
+
+struct panthor_ctx {
+	struct drm_panthor_gpu_info gpu_info;
+	uint32_t vm;
+	uint32_t group_count;
+	uint32_t groups[MAX_GROUPS_PER_CTX];
+};
+
 void igt_panthor_query(int fd, int32_t type, void *data, size_t size, int err);
+
 void igt_panthor_vm_create(int fd, uint32_t *vm_id, int err);
 void igt_panthor_vm_destroy(int fd, uint32_t vm_id, int err);
 void igt_panthor_vm_bind(int fd, uint32_t vm_id, uint32_t bo_handle, uint64_t va,
@@ -38,12 +49,21 @@ void igt_panthor_group_submit_simple(int fd, uint32_t group_handle,
 				     int err);
 uint64_t igt_panthor_get_first_core(uint64_t cores_present);
 
+void igt_panthor_ctx_create(int fd, struct panthor_ctx *ctx);
+void igt_panthor_ctx_destroy(int fd, struct panthor_ctx *ctx);
+void igt_panthor_ctx_add_group(int fd, struct panthor_ctx *ctx,
+			       enum drm_panthor_group_priority group_prio,
+			       const struct drm_panthor_queue_create *queues,
+			       uint32_t queue_count);
+
 enum cs_opcode {
 	CS_OPCODE_NOP = 0,
 	CS_OPCODE_MOVE48 = 1,
 	CS_OPCODE_MOVE32 = 2,
 	CS_OPCODE_WAIT = 3,
+	CS_OPCODE_ADD64 = 17,
 	CS_OPCODE_STM = 21,
+	CS_OPCODE_BRANCH = 22,
 	CS_OPCODE_FLUSH_CACHE = 36,
 };
 
@@ -61,6 +81,16 @@ enum cs_flush_mode {
 #error "big endian not supported"
 #endif
 
+enum cs_branch_cond {
+	CS_BRANCH_COND_LE = 0,
+	CS_BRANCH_COND_GT = 1,
+	CS_BRANCH_COND_EQ = 2,
+	CS_BRANCH_COND_NE = 3,
+	CS_BRANCH_COND_LT = 4,
+	CS_BRANCH_COND_GE = 5,
+	CS_BRANCH_COND_ALWAYS = 6,
+};
+
 struct cs_instr {
 	union {
 		struct {
@@ -89,6 +119,13 @@ struct cs_instr {
 			uint64_t unused1: 23;
 			uint64_t opcode: 8;
 		} wait;
+		struct {
+			uint64_t immediate: 32;
+			uint64_t unused0: 8;
+			uint64_t src: 8;
+			uint64_t dst: 8;
+			uint64_t opcode: 8;
+		} add64;
 		struct {
 			uint64_t offset: 16;
 			uint64_t mask: 16;
@@ -97,6 +134,15 @@ struct cs_instr {
 			uint64_t src: 8;
 			uint64_t opcode: 8;
 		} stm;
+		struct {
+			uint64_t offset: 16;
+			uint64_t unused0: 12;
+			uint64_t cond: 4;
+			uint64_t unused1: 8;
+			uint64_t src: 8;
+			uint64_t unused2: 8;
+			uint64_t opcode: 8;
+		} branch;
 		struct {
 			uint64_t l2_mode: 4;
 			uint64_t lsc_mode: 4;
@@ -167,6 +213,21 @@ cs_wait(uint16_t wait_mask, bool progress_inc)
 	return instr.raw;
 }
 
+static inline uint64_t
+cs_add64(uint32_t imm, uint8_t src, uint8_t dst)
+{
+	struct cs_instr instr = {
+		.add64 = {
+			.immediate = imm,
+			.src = src,
+			.dst = dst,
+			.opcode = CS_OPCODE_ADD64,
+		},
+	};
+
+	return instr.raw;
+}
+
 static inline uint64_t
 cs_stm(uint8_t address, uint8_t src, uint16_t mask, int16_t offset)
 {
@@ -195,6 +256,21 @@ cs_stm64(uint8_t address, uint8_t src, int16_t offset)
 	return cs_stm(address, src, 0x3, offset);
 }
 
+static inline uint64_t
+cs_branch(int16_t offset, enum cs_branch_cond cond, uint8_t src)
+{
+	struct cs_instr instr = {
+		.branch = {
+			.offset = (uint16_t)offset,
+			.cond = cond,
+			.src = src,
+			.opcode = CS_OPCODE_BRANCH,
+		},
+	};
+
+	return instr.raw;
+}
+
 static inline uint64_t
 cs_flush(enum cs_flush_mode l2_mode,
 	 enum cs_flush_mode lsc_mode,
diff --git a/tests/panthor/meson.build b/tests/panthor/meson.build
index 42a46e9934a9..8bd391596a97 100644
--- a/tests/panthor/meson.build
+++ b/tests/panthor/meson.build
@@ -2,6 +2,7 @@ panthor_progs = [
 	'panthor_gem',
 	'panthor_group',
 	'panthor_query',
+	'panthor_sched',
 	'panthor_vm',
 ]
 
diff --git a/tests/panthor/panthor_sched.c b/tests/panthor/panthor_sched.c
new file mode 100644
index 000000000000..7cded16c0acd
--- /dev/null
+++ b/tests/panthor/panthor_sched.c
@@ -0,0 +1,338 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: Copyright (C) 2025 Collabora Ltd.
+
+#include <stdint.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include "drm.h"
+#include "igt.h"
+#include "igt_core.h"
+#include "igt_panthor.h"
+#include "panthor_drm.h"
+
+static size_t
+infinite_incr_loop(uint64_t *cs, uint64_t counter_va)
+{
+	const uint8_t counter_va_reg = 68;
+	const uint8_t val_reg = 70;
+	uint64_t instrs[] = {
+		/* Load the source register ([r68; r69]) with the kernel address */
+		cs_mov48(counter_va_reg, counter_va),
+		/* Load a 0 into r70 */
+		cs_mov48(val_reg, 1),
+		/* STORE_MULTIPLE: Store the first register to the address pointed to by
+		 * [r68; r69]
+		 */
+		cs_stm64(counter_va_reg, val_reg, 0),
+		cs_wait(1, false),
+		cs_add64(1, val_reg, val_reg),
+		cs_branch(-4, CS_BRANCH_COND_ALWAYS, 0),
+	};
+
+	memcpy(cs, instrs, sizeof(instrs));
+	return sizeof(instrs);
+}
+
+struct panthor_sched_test_group_ctx {
+	uint32_t handle;
+	uint64_t *counter;
+	uint64_t cs_va;
+	uint32_t cs_size;
+};
+
+#define MAX_GROUPS	128
+
+struct panthor_sched_test_ctx {
+	struct panthor_ctx ctx;
+	struct panthor_bo cs_bo;
+	uint32_t cs_bo_offset;
+	struct panthor_bo counter_bo;
+	uint32_t counter_bo_offset;
+	uint32_t group_count;
+	struct panthor_sched_test_group_ctx groups[MAX_GROUPS];
+};
+
+#define CS_BO_VA	0x100000
+#define COUNTER_BO_VA	0x200000
+
+static void
+sched_test_ctx_create(int fd, struct panthor_sched_test_ctx *ctx)
+{
+	memset(ctx, 0, sizeof(*ctx));
+	igt_panthor_ctx_create(fd, &ctx->ctx);
+	igt_panthor_bo_create_mapped(fd, &ctx->cs_bo, getpagesize(), 0, 0);
+	igt_panthor_vm_bind(fd, ctx->ctx.vm, ctx->cs_bo.handle, CS_BO_VA, ctx->cs_bo.size,
+			    DRM_PANTHOR_VM_BIND_OP_MAP_READONLY |
+			    DRM_PANTHOR_VM_BIND_OP_TYPE_MAP,
+			    0);
+	igt_panthor_bo_create_mapped(fd, &ctx->counter_bo, getpagesize(), 0, 0);
+	igt_panthor_vm_bind(fd, ctx->ctx.vm, ctx->counter_bo.handle, COUNTER_BO_VA,
+			    ctx->counter_bo.size,
+			    DRM_PANTHOR_VM_BIND_OP_MAP_UNCACHED |
+			    DRM_PANTHOR_VM_BIND_OP_MAP_NOEXEC |
+			    DRM_PANTHOR_VM_BIND_OP_TYPE_MAP,
+			    0);
+}
+
+static void
+sched_test_ctx_destroy(int fd, struct panthor_sched_test_ctx *ctx)
+{
+	igt_panthor_ctx_destroy(fd, &ctx->ctx);
+}
+
+static void
+sched_test_ctx_add_group(int fd, struct panthor_sched_test_ctx *ctx,
+			 enum drm_panthor_group_priority group_prio)
+{
+	struct drm_panthor_queue_create queue_create = {
+		.priority = 0,
+		.ringbuf_size = getpagesize(),
+	};
+	uint64_t *cs = (uint64_t *)((uint8_t *)ctx->cs_bo.map + ctx->cs_bo_offset);
+	uint64_t *counters = ctx->counter_bo.map;
+	unsigned int group_idx = ctx->group_count;
+	uint64_t counter_va = COUNTER_BO_VA + group_idx * sizeof(counters[0]);
+	unsigned int cs_size;
+
+	igt_assert_lt(ctx->group_count, ARRAY_SIZE(ctx->groups));
+
+	igt_panthor_ctx_add_group(fd, &ctx->ctx, group_prio, &queue_create, 1);
+	cs_size = infinite_incr_loop(cs, counter_va);
+	cs_size = ALIGN(cs_size, 64);
+	ctx->groups[ctx->group_count++] = (struct panthor_sched_test_group_ctx){
+		.handle = ctx->ctx.groups[group_idx],
+		.counter = &counters[group_idx],
+		.cs_va = CS_BO_VA + ctx->cs_bo_offset,
+		.cs_size = cs_size,
+	};
+
+	ctx->cs_bo_offset += cs_size;
+	igt_assert_lt(ctx->cs_bo_offset, ctx->cs_bo.size);
+}
+
+static void
+sched_test_ctx_submit_group(int fd, struct panthor_sched_test_ctx *ctx,
+			    unsigned int group_idx)
+{
+	struct drm_panthor_queue_submit qsubmit = {
+		.queue_index = 0,
+		.stream_size = ctx->groups[group_idx].cs_size,
+		.stream_addr = ctx->groups[group_idx].cs_va,
+		.latest_flush = 0,
+	};
+	struct drm_panthor_group_submit gsubmit = {
+		.group_handle = ctx->groups[group_idx].handle,
+		.queue_submits = DRM_PANTHOR_OBJ_ARRAY(1, &qsubmit),
+	};
+
+	igt_assert_lt(group_idx, ctx->group_count);
+	igt_assert_eq(igt_ioctl(fd, DRM_IOCTL_PANTHOR_GROUP_SUBMIT, &gsubmit), 0);
+}
+
+igt_main {
+	int fd;
+
+	igt_fixture {
+		fd = drm_open_driver(DRIVER_PANTHOR);
+	}
+
+	igt_describe("Schedule 8 groups with the same prio");
+	igt_subtest("sched_8_groups_same_prio") {
+		uint64_t min_cnt = UINT64_MAX, max_cnt = 0;
+		struct panthor_sched_test_ctx ctx;
+		const unsigned int group_cnt = 8;
+
+		sched_test_ctx_create(fd, &ctx);
+
+		for (unsigned int i = 0; i < group_cnt; i++)
+			sched_test_ctx_add_group(fd, &ctx, PANTHOR_GROUP_PRIORITY_MEDIUM);
+
+		for (unsigned int i = 0; i < group_cnt; i++) {
+			sched_test_ctx_submit_group(fd, &ctx, i);
+
+			/* Add some delay, to make sure each group becomes
+			 * active at a different time, and exercise the
+			 * idle -> active transition that appeared to be
+			 * broken at some point.
+			 */
+			usleep(100000);
+		}
+
+		/* Jobs will timeout, because we've issued an infinte loop,
+		 * but leave it some time before checking the counter
+		 * values.
+		 */
+		sleep(6);
+
+		for (unsigned int i = 0; i < group_cnt; i++) {
+			min_cnt = min(min_cnt, *ctx.groups[i].counter);
+			max_cnt = max(max_cnt, *ctx.groups[i].counter);
+		}
+
+		igt_assert_lt(200000, min_cnt);
+		igt_assert_lte(min_cnt, max_cnt);
+
+		/* Allow a 20% difference max? */
+		igt_assert_lt((((max_cnt - min_cnt) * 100) / min_cnt), 20);
+
+		sched_test_ctx_destroy(fd, &ctx);
+	}
+
+	igt_describe("Schedule 16 groups with the same prio");
+	igt_subtest("sched_16_groups_same_prio") {
+		uint64_t min_cnt = UINT64_MAX, max_cnt = 0;
+		struct panthor_sched_test_ctx ctx;
+		const unsigned int group_cnt = 16;
+
+		sched_test_ctx_create(fd, &ctx);
+
+		for (unsigned int i = 0; i < group_cnt; i++)
+			sched_test_ctx_add_group(fd, &ctx, PANTHOR_GROUP_PRIORITY_MEDIUM);
+
+		for (unsigned int i = 0; i < group_cnt; i++) {
+			sched_test_ctx_submit_group(fd, &ctx, i);
+
+			/* Add some delay, to make sure each group becomes
+			 * active at a different time, and exercise the
+			 * idle -> active transition that appeared to be
+			 * broken at some point.
+			 */
+			usleep(100000);
+		}
+
+		/* Jobs will timeout, because we've issued an infinte loop,
+		 * but leave it some time before checking the counter
+		 * values.
+		 */
+		sleep(15);
+
+		for (unsigned int i = 0; i < group_cnt; i++) {
+			min_cnt = min(min_cnt, *ctx.groups[i].counter);
+			max_cnt = max(max_cnt, *ctx.groups[i].counter);
+		}
+
+		igt_assert_lt(200000, min_cnt);
+		igt_assert_lte(min_cnt, max_cnt);
+
+		/* Allow a 20% difference max? */
+		igt_assert_lt((((max_cnt - min_cnt) * 100) / min_cnt), 20);
+
+		sched_test_ctx_destroy(fd, &ctx);
+	}
+
+	igt_describe("Schedule 15 groups with medium prio, one high");
+	igt_subtest("sched_15_groups_med_1_high") {
+		uint64_t min_cnt = UINT64_MAX, max_cnt = 0;
+		struct panthor_sched_test_ctx ctx;
+		const unsigned int group_cnt = 16;
+		const unsigned int group_high = group_cnt - 1;
+
+		sched_test_ctx_create(fd, &ctx);
+
+		for (unsigned int i = 0; i < group_cnt; i++) {
+			sched_test_ctx_add_group(fd, &ctx,
+						 i == group_high ?
+						 PANTHOR_GROUP_PRIORITY_HIGH :
+						 PANTHOR_GROUP_PRIORITY_MEDIUM);
+		}
+
+		for (unsigned int i = 0; i < group_cnt; i++) {
+			sched_test_ctx_submit_group(fd, &ctx, i);
+
+			/* Add some delay, to make sure each group becomes
+			 * active at a different time, and exercise the
+			 * idle -> active transition that appeared to be
+			 * broken at some point.
+			 */
+			usleep(100000);
+		}
+
+		/* Jobs will timeout, because we've issued an infinte loop,
+		 * but leave it some time before checking the counter
+		 * values.
+		 */
+		sleep(15);
+
+		for (unsigned int i = 0; i < group_cnt; i++) {
+			if (i == group_high)
+				continue;
+
+			min_cnt = min(min_cnt, *ctx.groups[i].counter);
+			max_cnt = max(max_cnt, *ctx.groups[i].counter);
+		}
+
+		igt_assert_lt(200000, min_cnt);
+		igt_assert_lte(min_cnt, max_cnt);
+
+		/* Allow a 30% difference max on all med groups? */
+		igt_assert_lt((((max_cnt - min_cnt) * 100) / min_cnt), 30);
+
+		/* High group's counter must be at least 1.5x the other groups. */
+		igt_assert_lt((float)max_cnt * 1.5, (float)*ctx.groups[group_high].counter);
+
+		sched_test_ctx_destroy(fd, &ctx);
+	}
+
+	igt_describe("Schedule 4 groups with RT prio, one high");
+	igt_subtest("sched_4_groups_rt_1_high") {
+		uint64_t min_cnt = UINT64_MAX, max_cnt = 0;
+		struct panthor_sched_test_ctx ctx;
+		const unsigned int group_cnt = 5;
+		const unsigned int group_high = group_cnt - 1;
+		uint64_t group_high_counter;
+
+		sched_test_ctx_create(fd, &ctx);
+
+		for (unsigned int i = 0; i < group_cnt; i++) {
+			sched_test_ctx_add_group(fd, &ctx,
+						 i == group_high ?
+						 PANTHOR_GROUP_PRIORITY_HIGH :
+						 PANTHOR_GROUP_PRIORITY_REALTIME);
+		}
+
+		for (unsigned int i = 0; i < group_cnt; i++) {
+			if (i == group_high)
+				continue;
+			sched_test_ctx_submit_group(fd, &ctx, i);
+		}
+
+		/* Leave it some time so the SW scheduler can make all RT groups
+		 * active, and the high one really doesn't get a chance to run.
+		 * Ideally the dequeueing of jobs would also take the group
+		 * priority into account, but that's not the case.
+		 */
+		usleep(200000);
+		sched_test_ctx_submit_group(fd, &ctx, group_high);
+
+		/* Make sure we wait less than the timeout, otherwise the group with
+		 * high priority will be left a chance to run as soon as one of the RT
+		 * group dies.
+		 */
+		sleep(2);
+
+		group_high_counter = *ctx.groups[group_high].counter;
+		for (unsigned int i = 0; i < group_cnt; i++) {
+			if (i == group_high)
+				continue;
+
+			min_cnt = min(min_cnt, *ctx.groups[i].counter);
+			max_cnt = max(max_cnt, *ctx.groups[i].counter);
+		}
+
+		igt_assert_lt(200000, min_cnt);
+		igt_assert_lte(min_cnt, max_cnt);
+
+		/* Allow a 30% difference max on all med groups? */
+		igt_assert_lt((((max_cnt - min_cnt) * 100) / min_cnt), 30);
+
+		/* High group should never run. */
+		igt_assert_eq(group_high_counter, 0);
+
+		sched_test_ctx_destroy(fd, &ctx);
+	}
+
+	igt_fixture {
+		drm_close_driver(fd);
+	}
+}
-- 
2.51.1

Re: [PATCH i-g-t v2 3/3] tests/panthor: Add scheduler tests

[Daniel Almeida]

Hi Boris,

> On 28 Nov 2025, at 06:38, Boris Brezillon <boris.brezillon@collabora.com> wrote:
> 
> Tests developed while working on this set of fixes [1].
> 
> [1]https://lore.kernel.org/all/20251112115142.1270931-1-boris.brezillon@collabora.com/
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
> ---
> lib/igt_panthor.c             |  71 +++++++
> lib/igt_panthor.h             |  76 ++++++++
> tests/panthor/meson.build     |   1 +
> tests/panthor/panthor_sched.c | 338 ++++++++++++++++++++++++++++++++++
> 4 files changed, 486 insertions(+)
> create mode 100644 tests/panthor/panthor_sched.c
> 
> diff --git a/lib/igt_panthor.c b/lib/igt_panthor.c
> index 73ada9c59bfc..802cb182753c 100644
> --- a/lib/igt_panthor.c
> +++ b/lib/igt_panthor.c
> @@ -2,6 +2,7 @@
> // SPDX-FileCopyrightText: Copyright (C) 2025 Collabora Ltd.
> 
> #include "drmtest.h"
> +#include "igt_aux.h"
> #include "igt_panthor.h"
> #include "ioctl_wrappers.h"
> #include "panthor_drm.h"
> @@ -370,3 +371,73 @@ void igt_panthor_free_bo(int fd, struct panthor_bo *bo)
> 
> gem_close(fd, bo->handle);
> }
> +
> +/**
> + * igt_panthor_ctx_create:
> + * @fd: panthor device file descriptor
> + * @ctx: context to initialize
> + *
> + * Creates base resources (VM and GPU info) needed for GPU job submission
> + */
> +void igt_panthor_ctx_create(int fd, struct panthor_ctx *ctx)
> +{
> + memset(ctx, 0, sizeof(*ctx));
> + igt_panthor_query(fd, DRM_PANTHOR_DEV_QUERY_GPU_INFO,
> +  &ctx->gpu_info, sizeof(ctx->gpu_info), 0);
> + igt_panthor_vm_create(fd, &ctx->vm, 0);
> +}
> +
> +/**
> + * igt_panthor_ctx_destroy:
> + * @fd: panthor device file descriptor
> + * @ctx: context to cleanup
> + *
> + * Releases all the resources attached to a GPU context.
> + */
> +void igt_panthor_ctx_destroy(int fd, struct panthor_ctx *ctx)
> +{
> + for (uint32_t i = 0; i < ctx->group_count; i++) {
> + struct drm_panthor_group_destroy group_destroy = {
> + .group_handle = ctx->groups[i],
> + };
> +
> + igt_assert_eq(igt_ioctl(fd, DRM_IOCTL_PANTHOR_GROUP_DESTROY, &group_destroy), 0);
> + }
> +
> + igt_panthor_vm_destroy(fd, ctx->vm, 0);
> +}
> +
> +/**
> + * igt_panthor_ctx_add_group:
> + * @fd: panthor device file descriptor
> + * @ctx: context to add a group to
> + * @group_prio: group priority
> + * @queues: properties of queues attached to the group
> + * @queue_count: number of queues attached to the group
> + *
> + * Adds a group to a GPU context. Such groups will be released when
> + * the context is destroyed.
> + */
> +void igt_panthor_ctx_add_group(int fd, struct panthor_ctx *ctx,
> +       enum drm_panthor_group_priority group_prio,
> +       const struct drm_panthor_queue_create *queues,
> +       uint32_t queue_count)
> +{
> + unsigned int shader_core_count = igt_hweight(ctx->gpu_info.shader_present);
> + struct drm_panthor_group_create group_create = {
> + .queues = DRM_PANTHOR_OBJ_ARRAY(queue_count, queues),
> + .max_compute_cores = shader_core_count,
> + .max_fragment_cores = shader_core_count,
> + .max_tiler_cores = 1,
> + .priority = group_prio,
> + .compute_core_mask = ctx->gpu_info.shader_present,
> + .fragment_core_mask = ctx->gpu_info.shader_present,
> + .tiler_core_mask = ctx->gpu_info.tiler_present,
> + .vm_id = ctx->vm,
> + };
> +
> + igt_assert(ctx->group_count < ARRAY_SIZE(ctx->groups));
> + igt_assert_eq(igt_ioctl(fd, DRM_IOCTL_PANTHOR_GROUP_CREATE, &group_create), 0);
> + igt_assert(group_create.group_handle > 0);
> + ctx->groups[ctx->group_count++] = group_create.group_handle;
> +}
> diff --git a/lib/igt_panthor.h b/lib/igt_panthor.h
> index dc90033c0ad4..2a62eff37b2b 100644
> --- a/lib/igt_panthor.h
> +++ b/lib/igt_panthor.h
> @@ -7,6 +7,7 @@
> #include <stddef.h>
> #include <stdint.h>
> #include <stdbool.h>
> +
> #include "panthor_drm.h"
> 
> struct panthor_bo {
> @@ -16,7 +17,17 @@ struct panthor_bo {
> void *map;
> };
> 
> +#define MAX_GROUPS_PER_CTX 128
> +
> +struct panthor_ctx {
> + struct drm_panthor_gpu_info gpu_info;
> + uint32_t vm;
> + uint32_t group_count;
> + uint32_t groups[MAX_GROUPS_PER_CTX];
> +};
> +
> void igt_panthor_query(int fd, int32_t type, void *data, size_t size, int err);
> +
> void igt_panthor_vm_create(int fd, uint32_t *vm_id, int err);
> void igt_panthor_vm_destroy(int fd, uint32_t vm_id, int err);
> void igt_panthor_vm_bind(int fd, uint32_t vm_id, uint32_t bo_handle, uint64_t va,
> @@ -38,12 +49,21 @@ void igt_panthor_group_submit_simple(int fd, uint32_t group_handle,
>     int err);
> uint64_t igt_panthor_get_first_core(uint64_t cores_present);
> 
> +void igt_panthor_ctx_create(int fd, struct panthor_ctx *ctx);
> +void igt_panthor_ctx_destroy(int fd, struct panthor_ctx *ctx);
> +void igt_panthor_ctx_add_group(int fd, struct panthor_ctx *ctx,
> +       enum drm_panthor_group_priority group_prio,
> +       const struct drm_panthor_queue_create *queues,
> +       uint32_t queue_count);
> +
> enum cs_opcode {
> CS_OPCODE_NOP = 0,
> CS_OPCODE_MOVE48 = 1,
> CS_OPCODE_MOVE32 = 2,
> CS_OPCODE_WAIT = 3,
> + CS_OPCODE_ADD64 = 17,
> CS_OPCODE_STM = 21,
> + CS_OPCODE_BRANCH = 22,
> CS_OPCODE_FLUSH_CACHE = 36,
> };
> 
> @@ -61,6 +81,16 @@ enum cs_flush_mode {
> #error "big endian not supported"
> #endif
> 
> +enum cs_branch_cond {
> + CS_BRANCH_COND_LE = 0,
> + CS_BRANCH_COND_GT = 1,
> + CS_BRANCH_COND_EQ = 2,
> + CS_BRANCH_COND_NE = 3,
> + CS_BRANCH_COND_LT = 4,
> + CS_BRANCH_COND_GE = 5,
> + CS_BRANCH_COND_ALWAYS = 6,
> +};
> +
> struct cs_instr {
> union {
> struct {
> @@ -89,6 +119,13 @@ struct cs_instr {
> uint64_t unused1: 23;
> uint64_t opcode: 8;
> } wait;
> + struct {
> + uint64_t immediate: 32;
> + uint64_t unused0: 8;
> + uint64_t src: 8;
> + uint64_t dst: 8;
> + uint64_t opcode: 8;
> + } add64;
> struct {
> uint64_t offset: 16;
> uint64_t mask: 16;
> @@ -97,6 +134,15 @@ struct cs_instr {
> uint64_t src: 8;
> uint64_t opcode: 8;
> } stm;
> + struct {
> + uint64_t offset: 16;
> + uint64_t unused0: 12;
> + uint64_t cond: 4;
> + uint64_t unused1: 8;
> + uint64_t src: 8;
> + uint64_t unused2: 8;
> + uint64_t opcode: 8;
> + } branch;
> struct {
> uint64_t l2_mode: 4;
> uint64_t lsc_mode: 4;
> @@ -167,6 +213,21 @@ cs_wait(uint16_t wait_mask, bool progress_inc)
> return instr.raw;
> }
> 
> +static inline uint64_t
> +cs_add64(uint32_t imm, uint8_t src, uint8_t dst)
> +{
> + struct cs_instr instr = {
> + .add64 = {
> + .immediate = imm,
> + .src = src,
> + .dst = dst,
> + .opcode = CS_OPCODE_ADD64,
> + },
> + };
> +
> + return instr.raw;
> +}
> +
> static inline uint64_t
> cs_stm(uint8_t address, uint8_t src, uint16_t mask, int16_t offset)
> {
> @@ -195,6 +256,21 @@ cs_stm64(uint8_t address, uint8_t src, int16_t offset)
> return cs_stm(address, src, 0x3, offset);
> }
> 
> +static inline uint64_t
> +cs_branch(int16_t offset, enum cs_branch_cond cond, uint8_t src)
> +{
> + struct cs_instr instr = {
> + .branch = {
> + .offset = (uint16_t)offset,
> + .cond = cond,
> + .src = src,
> + .opcode = CS_OPCODE_BRANCH,
> + },
> + };
> +
> + return instr.raw;
> +}
> +
> static inline uint64_t
> cs_flush(enum cs_flush_mode l2_mode,
> enum cs_flush_mode lsc_mode,
> diff --git a/tests/panthor/meson.build b/tests/panthor/meson.build
> index 42a46e9934a9..8bd391596a97 100644
> --- a/tests/panthor/meson.build
> +++ b/tests/panthor/meson.build
> @@ -2,6 +2,7 @@ panthor_progs = [
> 'panthor_gem',
> 'panthor_group',
> 'panthor_query',
> + 'panthor_sched',
> 'panthor_vm',
> ]
> 
> diff --git a/tests/panthor/panthor_sched.c b/tests/panthor/panthor_sched.c
> new file mode 100644
> index 000000000000..7cded16c0acd
> --- /dev/null
> +++ b/tests/panthor/panthor_sched.c
> @@ -0,0 +1,338 @@
> +// SPDX-License-Identifier: MIT
> +// SPDX-FileCopyrightText: Copyright (C) 2025 Collabora Ltd.
> +
> +#include <stdint.h>
> +#include <sys/mman.h>
> +#include <unistd.h>
> +
> +#include "drm.h"
> +#include "igt.h"
> +#include "igt_core.h"
> +#include "igt_panthor.h"
> +#include "panthor_drm.h"
> +
> +static size_t
> +infinite_incr_loop(uint64_t *cs, uint64_t counter_va)
> +{
> + const uint8_t counter_va_reg = 68;
> + const uint8_t val_reg = 70;
> + uint64_t instrs[] = {
> + /* Load the source register ([r68; r69]) with the kernel address */
> + cs_mov48(counter_va_reg, counter_va),
> + /* Load a 0 into r70 */

Load a 1

> + cs_mov48(val_reg, 1),
> + /* STORE_MULTIPLE: Store the first register to the address pointed to by
> + * [r68; r69]
> + */
> + cs_stm64(counter_va_reg, val_reg, 0),
> + cs_wait(1, false),

Wait for what? All of these seem to be synchronous instructions?

> + cs_add64(1, val_reg, val_reg),
> + cs_branch(-4, CS_BRANCH_COND_ALWAYS, 0),
> + };
> +
> + memcpy(cs, instrs, sizeof(instrs));
> + return sizeof(instrs);
> +}
> +
> +struct panthor_sched_test_group_ctx {
> + uint32_t handle;
> + uint64_t *counter;
> + uint64_t cs_va;
> + uint32_t cs_size;
> +};
> +
> +#define MAX_GROUPS 128
> +
> +struct panthor_sched_test_ctx {
> + struct panthor_ctx ctx;
> + struct panthor_bo cs_bo;
> + uint32_t cs_bo_offset;
> + struct panthor_bo counter_bo;
> + uint32_t counter_bo_offset;
> + uint32_t group_count;
> + struct panthor_sched_test_group_ctx groups[MAX_GROUPS];
> +};
> +
> +#define CS_BO_VA 0x100000
> +#define COUNTER_BO_VA 0x200000
> +
> +static void
> +sched_test_ctx_create(int fd, struct panthor_sched_test_ctx *ctx)
> +{
> + memset(ctx, 0, sizeof(*ctx));
> + igt_panthor_ctx_create(fd, &ctx->ctx);
> + igt_panthor_bo_create_mapped(fd, &ctx->cs_bo, getpagesize(), 0, 0);
> + igt_panthor_vm_bind(fd, ctx->ctx.vm, ctx->cs_bo.handle, CS_BO_VA, ctx->cs_bo.size,
> +    DRM_PANTHOR_VM_BIND_OP_MAP_READONLY |
> +    DRM_PANTHOR_VM_BIND_OP_TYPE_MAP,
> +    0);
> + igt_panthor_bo_create_mapped(fd, &ctx->counter_bo, getpagesize(), 0, 0);
> + igt_panthor_vm_bind(fd, ctx->ctx.vm, ctx->counter_bo.handle, COUNTER_BO_VA,
> +    ctx->counter_bo.size,
> +    DRM_PANTHOR_VM_BIND_OP_MAP_UNCACHED |
> +    DRM_PANTHOR_VM_BIND_OP_MAP_NOEXEC |
> +    DRM_PANTHOR_VM_BIND_OP_TYPE_MAP,
> +    0);
> +}
> +
> +static void
> +sched_test_ctx_destroy(int fd, struct panthor_sched_test_ctx *ctx)
> +{
> + igt_panthor_ctx_destroy(fd, &ctx->ctx);
> +}
> +
> +static void
> +sched_test_ctx_add_group(int fd, struct panthor_sched_test_ctx *ctx,
> + enum drm_panthor_group_priority group_prio)
> +{
> + struct drm_panthor_queue_create queue_create = {
> + .priority = 0,
> + .ringbuf_size = getpagesize(),
> + };
> + uint64_t *cs = (uint64_t *)((uint8_t *)ctx->cs_bo.map + ctx->cs_bo_offset);
> + uint64_t *counters = ctx->counter_bo.map;
> + unsigned int group_idx = ctx->group_count;
> + uint64_t counter_va = COUNTER_BO_VA + group_idx * sizeof(counters[0]);
> + unsigned int cs_size;
> +
> + igt_assert_lt(ctx->group_count, ARRAY_SIZE(ctx->groups));
> +
> + igt_panthor_ctx_add_group(fd, &ctx->ctx, group_prio, &queue_create, 1);
> + cs_size = infinite_incr_loop(cs, counter_va);
> + cs_size = ALIGN(cs_size, 64);
> + ctx->groups[ctx->group_count++] = (struct panthor_sched_test_group_ctx){
> + .handle = ctx->ctx.groups[group_idx],
> + .counter = &counters[group_idx],
> + .cs_va = CS_BO_VA + ctx->cs_bo_offset,
> + .cs_size = cs_size,
> + };
> +
> + ctx->cs_bo_offset += cs_size;
> + igt_assert_lt(ctx->cs_bo_offset, ctx->cs_bo.size);
> +}
> +
> +static void
> +sched_test_ctx_submit_group(int fd, struct panthor_sched_test_ctx *ctx,
> +    unsigned int group_idx)
> +{
> + struct drm_panthor_queue_submit qsubmit = {
> + .queue_index = 0,
> + .stream_size = ctx->groups[group_idx].cs_size,
> + .stream_addr = ctx->groups[group_idx].cs_va,
> + .latest_flush = 0,
> + };
> + struct drm_panthor_group_submit gsubmit = {
> + .group_handle = ctx->groups[group_idx].handle,
> + .queue_submits = DRM_PANTHOR_OBJ_ARRAY(1, &qsubmit),
> + };
> +
> + igt_assert_lt(group_idx, ctx->group_count);
> + igt_assert_eq(igt_ioctl(fd, DRM_IOCTL_PANTHOR_GROUP_SUBMIT, &gsubmit), 0);
> +}
> +
> +igt_main {
> + int fd;
> +
> + igt_fixture {
> + fd = drm_open_driver(DRIVER_PANTHOR);
> + }
> +
> + igt_describe("Schedule 8 groups with the same prio");
> + igt_subtest("sched_8_groups_same_prio") {
> + uint64_t min_cnt = UINT64_MAX, max_cnt = 0;
> + struct panthor_sched_test_ctx ctx;
> + const unsigned int group_cnt = 8;
> +
> + sched_test_ctx_create(fd, &ctx);
> +
> + for (unsigned int i = 0; i < group_cnt; i++)
> + sched_test_ctx_add_group(fd, &ctx, PANTHOR_GROUP_PRIORITY_MEDIUM);
> +
> + for (unsigned int i = 0; i < group_cnt; i++) {
> + sched_test_ctx_submit_group(fd, &ctx, i);
> +
> + /* Add some delay, to make sure each group becomes
> + * active at a different time, and exercise the
> + * idle -> active transition that appeared to be
> + * broken at some point.
> + */
> + usleep(100000);
> + }
> +
> + /* Jobs will timeout, because we've issued an infinte loop,
> + * but leave it some time before checking the counter
> + * values.
> + */
> + sleep(6);
> +
> + for (unsigned int i = 0; i < group_cnt; i++) {
> + min_cnt = min(min_cnt, *ctx.groups[i].counter);
> + max_cnt = max(max_cnt, *ctx.groups[i].counter);
> + }
> +
> + igt_assert_lt(200000, min_cnt);
> + igt_assert_lte(min_cnt, max_cnt);
> +
> + /* Allow a 20% difference max? */
> + igt_assert_lt((((max_cnt - min_cnt) * 100) / min_cnt), 20);
> +
> + sched_test_ctx_destroy(fd, &ctx);
> + }
> +
> + igt_describe("Schedule 16 groups with the same prio");
> + igt_subtest("sched_16_groups_same_prio") {
> + uint64_t min_cnt = UINT64_MAX, max_cnt = 0;
> + struct panthor_sched_test_ctx ctx;
> + const unsigned int group_cnt = 16;
> +
> + sched_test_ctx_create(fd, &ctx);
> +
> + for (unsigned int i = 0; i < group_cnt; i++)
> + sched_test_ctx_add_group(fd, &ctx, PANTHOR_GROUP_PRIORITY_MEDIUM);
> +
> + for (unsigned int i = 0; i < group_cnt; i++) {
> + sched_test_ctx_submit_group(fd, &ctx, i);
> +
> + /* Add some delay, to make sure each group becomes
> + * active at a different time, and exercise the
> + * idle -> active transition that appeared to be
> + * broken at some point.
> + */
> + usleep(100000);
> + }
> +
> + /* Jobs will timeout, because we've issued an infinte loop,
> + * but leave it some time before checking the counter
> + * values.
> + */
> + sleep(15);
> +
> + for (unsigned int i = 0; i < group_cnt; i++) {
> + min_cnt = min(min_cnt, *ctx.groups[i].counter);
> + max_cnt = max(max_cnt, *ctx.groups[i].counter);
> + }
> +
> + igt_assert_lt(200000, min_cnt);
> + igt_assert_lte(min_cnt, max_cnt);
> +
> + /* Allow a 20% difference max? */
> + igt_assert_lt((((max_cnt - min_cnt) * 100) / min_cnt), 20);
> +
> + sched_test_ctx_destroy(fd, &ctx);
> + }
> +
> + igt_describe("Schedule 15 groups with medium prio, one high");
> + igt_subtest("sched_15_groups_med_1_high") {
> + uint64_t min_cnt = UINT64_MAX, max_cnt = 0;
> + struct panthor_sched_test_ctx ctx;
> + const unsigned int group_cnt = 16;
> + const unsigned int group_high = group_cnt - 1;
> +
> + sched_test_ctx_create(fd, &ctx);
> +
> + for (unsigned int i = 0; i < group_cnt; i++) {
> + sched_test_ctx_add_group(fd, &ctx,
> + i == group_high ?
> + PANTHOR_GROUP_PRIORITY_HIGH :
> + PANTHOR_GROUP_PRIORITY_MEDIUM);
> + }
> +
> + for (unsigned int i = 0; i < group_cnt; i++) {
> + sched_test_ctx_submit_group(fd, &ctx, i);
> +
> + /* Add some delay, to make sure each group becomes
> + * active at a different time, and exercise the
> + * idle -> active transition that appeared to be
> + * broken at some point.
> + */
> + usleep(100000);
> + }
> +
> + /* Jobs will timeout, because we've issued an infinte loop,
> + * but leave it some time before checking the counter
> + * values.
> + */
> + sleep(15);
> +
> + for (unsigned int i = 0; i < group_cnt; i++) {
> + if (i == group_high)
> + continue;
> +
> + min_cnt = min(min_cnt, *ctx.groups[i].counter);
> + max_cnt = max(max_cnt, *ctx.groups[i].counter);
> + }
> +
> + igt_assert_lt(200000, min_cnt);
> + igt_assert_lte(min_cnt, max_cnt);
> +
> + /* Allow a 30% difference max on all med groups? */
> + igt_assert_lt((((max_cnt - min_cnt) * 100) / min_cnt), 30);
> +
> + /* High group's counter must be at least 1.5x the other groups. */
> + igt_assert_lt((float)max_cnt * 1.5, (float)*ctx.groups[group_high].counter);
> +
> + sched_test_ctx_destroy(fd, &ctx);
> + }
> +
> + igt_describe("Schedule 4 groups with RT prio, one high");
> + igt_subtest("sched_4_groups_rt_1_high") {
> + uint64_t min_cnt = UINT64_MAX, max_cnt = 0;
> + struct panthor_sched_test_ctx ctx;
> + const unsigned int group_cnt = 5;
> + const unsigned int group_high = group_cnt - 1;
> + uint64_t group_high_counter;
> +
> + sched_test_ctx_create(fd, &ctx);
> +
> + for (unsigned int i = 0; i < group_cnt; i++) {
> + sched_test_ctx_add_group(fd, &ctx,
> + i == group_high ?
> + PANTHOR_GROUP_PRIORITY_HIGH :
> + PANTHOR_GROUP_PRIORITY_REALTIME);
> + }
> +
> + for (unsigned int i = 0; i < group_cnt; i++) {
> + if (i == group_high)
> + continue;
> + sched_test_ctx_submit_group(fd, &ctx, i);
> + }
> +
> + /* Leave it some time so the SW scheduler can make all RT groups
> + * active, and the high one really doesn't get a chance to run.
> + * Ideally the dequeueing of jobs would also take the group
> + * priority into account, but that's not the case.
> + */
> + usleep(200000);
> + sched_test_ctx_submit_group(fd, &ctx, group_high);
> +
> + /* Make sure we wait less than the timeout, otherwise the group with
> + * high priority will be left a chance to run as soon as one of the RT
> + * group dies.
> + */
> + sleep(2);
> +
> + group_high_counter = *ctx.groups[group_high].counter;
> + for (unsigned int i = 0; i < group_cnt; i++) {
> + if (i == group_high)
> + continue;
> +
> + min_cnt = min(min_cnt, *ctx.groups[i].counter);
> + max_cnt = max(max_cnt, *ctx.groups[i].counter);
> + }
> +
> + igt_assert_lt(200000, min_cnt);
> + igt_assert_lte(min_cnt, max_cnt);
> +
> + /* Allow a 30% difference max on all med groups? */
> + igt_assert_lt((((max_cnt - min_cnt) * 100) / min_cnt), 30);
> +
> + /* High group should never run. */
> + igt_assert_eq(group_high_counter, 0);
> +
> + sched_test_ctx_destroy(fd, &ctx);
> + }
> +
> + igt_fixture {
> + drm_close_driver(fd);
> + }
> +}
> -- 
> 2.51.1
> 


This looks good, but I tried it and this is the result:


IGT-Version: 2.2-g6ba172359 (aarch64) (Linux: 6.18.0-rc4-hwe aarch64)
Using IGT_SRANDOM=1764789962 for randomisation
Opened device: /dev/dri/card0
Starting subtest: sched_8_groups_same_prio
[  956.405832] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  956.406839] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  956.661846] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  956.662752] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  956.917917] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  956.918794] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  956.919620] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  957.173858] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
(panthor_sched:8051) CRITICAL: Test assertion failure function __igt_unique____real_main133, file ../tests/panthor/panthor_sched.c:177:
(panthor_sched:8051) CRITICAL: Failed assertion: (((max_cnt - min_cnt) * 100) / min_cnt) < 20
(panthor_sched:8051) CRITICAL: error: 1950 >= 20
Stack trace:
  #0 ../lib/igt_core.c:2296 __igt_fail_assert()
  #1 ../tests/panthor/panthor_sched.c:179 __igt_unique____real_main133()
  #2 ../tests/panthor/panthor_sched.c:133 main()
  #3 [<unknown>+0xb987229c]
  #4 [__libc_start_main+0x9c]
Subtest sched_8_groups_same_prio failed.
**** DEBUG ****
(panthor_sched:8051) CRITICAL: Test assertion failure function __igt_unique____real_main133, file ../tests/panthor/panthor_sched.c:177:
(panthor_sched:8051) CRITICAL: Failed assertion: (((max_cnt - min_cnt) * 100) / min_cnt) < 20
(panthor_sched:8051) CRITICAL: error: 1950 >= 20
(panthor_sched:8051) igt_core-INFO: Stack trace:
(panthor_sched:8051) igt_core-INFO:   #0 ../lib/igt_core.c:2296 __igt_fail_assert()
(panthor_sched:8051) igt_core-INFO:   #1 ../tests/panthor/panthor_sched.c:179 __igt_unique____real_main133()
(panthor_sched:8051) igt_core-INFO:   #2 ../tests/panthor/panthor_sched.c:133 main()
(panthor_sched:8051) igt_core-INFO:   #3 [<unknown>+0xb987229c]
(panthor_sched:8051) igt_core-INFO:   #4 [__libc_start_main+0x9c]
****  END  ****
Subtest sched_8_groups_same_prio: FAIL (6.868s)
Starting subtest: sched_16_groups_same_prio
[  966.658057] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  966.950047] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  967.286042] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  967.574037] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  967.862067] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  968.277970] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  968.342033] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  968.630049] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  968.694132] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  968.790115] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  968.886033] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  968.950019] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  968.982139] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  969.142087] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  972.278051] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  972.790126] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
(panthor_sched:8051) CRITICAL: Test assertion failure function __igt_unique____real_main133, file ../tests/panthor/panthor_sched.c:219:
(panthor_sched:8051) CRITICAL: Failed assertion: (((max_cnt - min_cnt) * 100) / min_cnt) < 20
(panthor_sched:8051) CRITICAL: error: 1729 >= 20
Stack trace:
  #0 ../lib/igt_core.c:2296 __igt_fail_assert()
  #1 ../tests/panthor/panthor_sched.c:221 __igt_unique____real_main133()
  #2 ../tests/panthor/panthor_sched.c:133 main()
  #3 [<unknown>+0xb987229c]
  #4 [__libc_start_main+0x9c]
Subtest sched_16_groups_same_prio failed.
**** DEBUG ****
(panthor_sched:8051) CRITICAL: Test assertion failure function __igt_unique____real_main133, file ../tests/panthor/panthor_sched.c:219:
(panthor_sched:8051) CRITICAL: Failed assertion: (((max_cnt - min_cnt) * 100) / min_cnt) < 20
(panthor_sched:8051) CRITICAL: error: 1729 >= 20
(panthor_sched:8051) igt_core-INFO: Stack trace:
(panthor_sched:8051) igt_core-INFO:   #0 ../lib/igt_core.c:2296 __igt_fail_assert()
(panthor_sched:8051) igt_core-INFO:   #1 ../tests/panthor/panthor_sched.c:221 __igt_unique____real_main133()
(panthor_sched:8051) igt_core-INFO:   #2 ../tests/panthor/panthor_sched.c:133 main()
(panthor_sched:8051) igt_core-INFO:   #3 [<unknown>+0xb987229c]
(panthor_sched:8051) igt_core-INFO:   #4 [__libc_start_main+0x9c]
****  END  ****
Subtest sched_16_groups_same_prio: FAIL (16.619s)
Starting subtest: sched_15_groups_med_1_high
[  981.494175] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  982.774389] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  983.542380] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  983.706258] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  984.022303] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  984.534323] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  984.758239] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  984.886290] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  984.894132] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  985.046324] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  985.078218] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  985.238128] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  985.398222] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  985.462335] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  985.558313] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
[  989.686323] panthor fb000000.gpu: [drm] job timeout: pid=8051, comm=panthor_sched, seqno=1
(panthor_sched:8051) CRITICAL: Test assertion failure function __igt_unique____real_main133, file ../tests/panthor/panthor_sched.c:269:
(panthor_sched:8051) CRITICAL: Failed assertion: (((max_cnt - min_cnt) * 100) / min_cnt) < 30
(panthor_sched:8051) CRITICAL: error: 444 >= 30
Stack trace:
  #0 ../lib/igt_core.c:2296 __igt_fail_assert()
  #1 ../tests/panthor/panthor_sched.c:272 __igt_unique____real_main133()
  #2 ../tests/panthor/panthor_sched.c:133 main()
  #3 [<unknown>+0xb987229c]
  #4 [__libc_start_main+0x9c]
Subtest sched_15_groups_med_1_high failed.
**** DEBUG ****
(panthor_sched:8051) CRITICAL: Test assertion failure function __igt_unique____real_main133, file ../tests/panthor/panthor_sched.c:269:
(panthor_sched:8051) CRITICAL: Failed assertion: (((max_cnt - min_cnt) * 100) / min_cnt) < 30
(panthor_sched:8051) CRITICAL: error: 444 >= 30
(panthor_sched:8051) igt_core-INFO: Stack trace:
(panthor_sched:8051) igt_core-INFO:   #0 ../lib/igt_core.c:2296 __igt_fail_assert()
(panthor_sched:8051) igt_core-INFO:   #1 ../tests/panthor/panthor_sched.c:272 __igt_unique____real_main133()
(panthor_sched:8051) igt_core-INFO:   #2 ../tests/panthor/panthor_sched.c:133 main()
(panthor_sched:8051) igt_core-INFO:   #3 [<unknown>+0xb987229c]
(panthor_sched:8051) igt_core-INFO:   #4 [__libc_start_main+0x9c]
****  END  ****
Subtest sched_15_groups_med_1_high: FAIL (16.617s)
Starting subtest: sched_4_groups_rt_1_high
Subtest sched_4_groups_rt_1_high: SUCCESS (2.205s)

Re: [PATCH i-g-t v2 3/3] tests/panthor: Add scheduler tests

[Boris Brezillon]

On Wed, 3 Dec 2025 16:31:59 -0300
Daniel Almeida <daniel.almeida@collabora.com> wrote:

[...]
> > diff --git a/tests/panthor/panthor_sched.c b/tests/panthor/panthor_sched.c
> > new file mode 100644
> > index 000000000000..7cded16c0acd
> > --- /dev/null
> > +++ b/tests/panthor/panthor_sched.c
> > @@ -0,0 +1,338 @@
> > +// SPDX-License-Identifier: MIT
> > +// SPDX-FileCopyrightText: Copyright (C) 2025 Collabora Ltd.
> > +
> > +#include <stdint.h>
> > +#include <sys/mman.h>
> > +#include <unistd.h>
> > +
> > +#include "drm.h"
> > +#include "igt.h"
> > +#include "igt_core.h"
> > +#include "igt_panthor.h"
> > +#include "panthor_drm.h"
> > +
> > +static size_t
> > +infinite_incr_loop(uint64_t *cs, uint64_t counter_va)
> > +{
> > + const uint8_t counter_va_reg = 68;
> > + const uint8_t val_reg = 70;
> > + uint64_t instrs[] = {
> > + /* Load the source register ([r68; r69]) with the kernel address */
> > + cs_mov48(counter_va_reg, counter_va),
> > + /* Load a 0 into r70 */  
> 
> Load a 1

Oops, will fix the comment.

> 
> > + cs_mov48(val_reg, 1),
> > + /* STORE_MULTIPLE: Store the first register to the address pointed to by
> > + * [r68; r69]
> > + */
> > + cs_stm64(counter_va_reg, val_reg, 0),
> > + cs_wait(1, false),  
> 
> Wait for what? All of these seem to be synchronous instructions?

Nope, load/store instructions are asynchronous, you need to wait for
the SB assigned to "other-asynchronous-ops" (defaults to zero) for the
mem operation to be effective.

> 
> > + cs_add64(1, val_reg, val_reg),
> > + cs_branch(-4, CS_BRANCH_COND_ALWAYS, 0),
> > + };

> 
> This looks good, but I tried it and this is the result:

If you're not testing with drm-misc-next, that's normal. Those tests
are added to make sure we don't regress those scheduling cases again.