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Message-ID: <424cfb2c-c693-4197-89c8-6c3b13477141@arm.com>
Date: Fri, 25 Jul 2025 10:09:40 +0100
From: Lukas Zapolskas <lukas.zapolskas@....com>
To: Adrián Larumbe <adrian.larumbe@...labora.com>
Cc: 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>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 7/7] drm/panthor: Expose the panthor perf ioctls
On 18/07/2025 16:19, Adrián Larumbe wrote:
> Hi Lucas, another missing remark from the original review,
>
> On 16.05.2025 16:49, Lukas Zapolskas wrote:
>> This patch implements the PANTHOR_PERF_CONTROL ioctl series, and
>> a PANTHOR_GET_UOBJ wrapper to deal with the backwards and forwards
>> compatibility of the uAPI.
>>
>> The minor version is bumped to indicate that the feature is now
>> supported.
>>
>> Signed-off-by: Lukas Zapolskas <lukas.zapolskas@....com>
>> Reviewed-by: Adrián Larumbe <adrian.larumbe@...labora.com>
>> ---
>> drivers/gpu/drm/panthor/panthor_drv.c | 141 +++++++++++++++++++++++++-
>> 1 file changed, 139 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c
>> index 4c1381320859..850a894fe91b 100644
>> --- a/drivers/gpu/drm/panthor/panthor_drv.c
>> +++ b/drivers/gpu/drm/panthor/panthor_drv.c
>> @@ -31,6 +31,7 @@
>> #include "panthor_gpu.h"
>> #include "panthor_heap.h"
>> #include "panthor_mmu.h"
>> +#include "panthor_perf.h"
>> #include "panthor_regs.h"
>> #include "panthor_sched.h"
>>
>> @@ -73,6 +74,39 @@ panthor_set_uobj(u64 usr_ptr, u32 usr_size, u32 min_size, u32 kern_size, const v
>> return 0;
>> }
>>
>> +/**
>> + * panthor_get_uobj() - Copy kernel object to user object.
>> + * @usr_ptr: Users pointer.
>> + * @usr_size: Size of the user object.
>> + * @min_size: Minimum size for this object.
>> + *
>> + * Helper automating kernel -> user object copies.
>> + *
>> + * Don't use this function directly, use PANTHOR_UOBJ_GET() instead.
>> + *
>> + * Return: valid pointer on success, an encoded error code otherwise.
>> + */
>> +static void*
>> +panthor_get_uobj(u64 usr_ptr, u32 usr_size, u32 min_size)
>> +{
>> + int ret;
>> + void *out_alloc __free(kvfree) = NULL;
>> +
>> + /* User size shouldn't be smaller than the minimal object size. */
>> + if (usr_size < min_size)
>> + return ERR_PTR(-EINVAL);
>> +
>> + out_alloc = kvmalloc(min_size, GFP_KERNEL);
>> + if (!out_alloc)
>> + return ERR_PTR(-ENOMEM);
>> +
>> + ret = copy_struct_from_user(out_alloc, min_size, u64_to_user_ptr(usr_ptr), usr_size);
>> + if (ret)
>> + return ERR_PTR(ret);
>> +
>> + return_ptr(out_alloc);
>> +}
>> +
>> /**
>> * panthor_get_uobj_array() - Copy a user object array into a kernel accessible object array.
>> * @in: The object array to copy.
>> @@ -176,7 +210,12 @@ panthor_get_uobj_array(const struct drm_panthor_obj_array *in, u32 min_stride,
>> PANTHOR_UOBJ_DECL(struct drm_panthor_queue_submit, syncs), \
>> PANTHOR_UOBJ_DECL(struct drm_panthor_queue_create, ringbuf_size), \
>> PANTHOR_UOBJ_DECL(struct drm_panthor_vm_bind_op, syncs), \
>> - PANTHOR_UOBJ_DECL(struct drm_panthor_perf_info, shader_blocks))
>> + PANTHOR_UOBJ_DECL(struct drm_panthor_perf_info, shader_blocks), \
>> + PANTHOR_UOBJ_DECL(struct drm_panthor_perf_cmd_setup, shader_enable_mask), \
>> + PANTHOR_UOBJ_DECL(struct drm_panthor_perf_cmd_start, user_data), \
>> + PANTHOR_UOBJ_DECL(struct drm_panthor_perf_cmd_stop, user_data), \
>> + PANTHOR_UOBJ_DECL(struct drm_panthor_perf_cmd_sample, user_data))
>> +
>>
>> /**
>> * PANTHOR_UOBJ_SET() - Copy a kernel object to a user object.
>> @@ -191,6 +230,24 @@ panthor_get_uobj_array(const struct drm_panthor_obj_array *in, u32 min_stride,
>> PANTHOR_UOBJ_MIN_SIZE(_src_obj), \
>> sizeof(_src_obj), &(_src_obj))
>>
>> +/**
>> + * PANTHOR_UOBJ_GET() - Copies a user object from _usr_ptr to a kernel accessible _dest_ptr.
>> + * @_dest_ptr: Local variable
>> + * @_usr_size: Size of the user object.
>> + * @_usr_ptr: The pointer of the object in userspace.
>> + *
>> + * Return: Error code. See panthor_get_uobj().
>> + */
>> +#define PANTHOR_UOBJ_GET(_dest_ptr, _usr_size, _usr_ptr) \
>> + ({ \
>> + typeof(_dest_ptr) _tmp; \
>> + _tmp = panthor_get_uobj(_usr_ptr, _usr_size, \
>> + PANTHOR_UOBJ_MIN_SIZE(_tmp[0])); \
>> + if (!IS_ERR(_tmp)) \
>> + _dest_ptr = _tmp; \
>> + PTR_ERR_OR_ZERO(_tmp); \
>> + })
>> +
>> /**
>> * PANTHOR_UOBJ_GET_ARRAY() - Copy a user object array to a kernel accessible
>> * object array.
>> @@ -1339,6 +1396,83 @@ static int panthor_ioctl_vm_get_state(struct drm_device *ddev, void *data,
>> return 0;
>> }
>>
>> +#define perf_cmd(command) \
>> + ({ \
>> + struct drm_panthor_perf_cmd_##command *command##_args __free(kvfree) = NULL; \
>> + int _ret = PANTHOR_UOBJ_GET(command##_args, args->size, args->pointer); \
>> + if (_ret) \
>> + return _ret; \
>> + return panthor_perf_session_##command(pfile, ptdev->perf, args->handle, \
>> + command##_args->user_data); \
>> + })
>> +
>> +static int panthor_ioctl_perf_control(struct drm_device *ddev, void *data,
>> + struct drm_file *file)
>> +{
>> + struct panthor_device *ptdev = container_of(ddev, struct panthor_device, base);
>> + struct panthor_file *pfile = file->driver_priv;
>> + struct drm_panthor_perf_control *args = data;
>> + int ret;
>> +
>> + if (!args->pointer) {
>> + switch (args->cmd) {
>> + case DRM_PANTHOR_PERF_COMMAND_SETUP:
>> + args->size = sizeof(struct drm_panthor_perf_cmd_setup);
>> + return 0;
>> +
>> + case DRM_PANTHOR_PERF_COMMAND_TEARDOWN:
>> + args->size = 0;
>> + return 0;
>> +
>> + case DRM_PANTHOR_PERF_COMMAND_START:
>> + args->size = sizeof(struct drm_panthor_perf_cmd_start);
>> + return 0;
>> +
>> + case DRM_PANTHOR_PERF_COMMAND_STOP:
>> + args->size = sizeof(struct drm_panthor_perf_cmd_stop);
>> + return 0;
>> +
>> + case DRM_PANTHOR_PERF_COMMAND_SAMPLE:
>> + args->size = sizeof(struct drm_panthor_perf_cmd_sample);
>> + return 0;
>> +
>> + default:
>> + return -EINVAL;
>> + }
>> + }
>> +
>> + switch (args->cmd) {
>> + case DRM_PANTHOR_PERF_COMMAND_SETUP:
>> + {
>> + struct drm_panthor_perf_cmd_setup *setup_args __free(kvfree) = NULL;
>> +
>> + ret = PANTHOR_UOBJ_GET(setup_args, args->size, args->pointer);
>> + if (ret)
>> + return -EINVAL;
>> +
>> + return panthor_perf_session_setup(ptdev, ptdev->perf, setup_args, pfile);
>
> I think this is something I had already brought up in the revision for v2 of the patch series,
> but I think I would pass the drm_file here straight away rather than the panthor file,
> then retrieve the panthor_file pointer from the file's driver_priv field inside
> panthor_perf_session_setup, and that way you can get rid of struct panthor_file::drm_file.
>
> I think this should be alright, because the only place where it'd be essential to keep
> a copy of the drm_file is in the session struct, to make sure sessions match their DRM device fd's.
>
Thank you for pointing this out, I hadn't quite understood the suggestion for v2. Will update
the patches accordingly.
>> + }
>> + case DRM_PANTHOR_PERF_COMMAND_TEARDOWN:
>> + {
>> + return panthor_perf_session_teardown(pfile, ptdev->perf, args->handle);
>> + }
>> + case DRM_PANTHOR_PERF_COMMAND_START:
>> + {
>> + perf_cmd(start);
>> + }
>> + case DRM_PANTHOR_PERF_COMMAND_STOP:
>> + {
>> + perf_cmd(stop);
>> + }
>> + case DRM_PANTHOR_PERF_COMMAND_SAMPLE:
>> + {
>> + perf_cmd(sample);
>> + }
>> + default:
>> + return -EINVAL;
>> + }
>> +}
>> +
>> static int
>> panthor_open(struct drm_device *ddev, struct drm_file *file)
>> {
>> @@ -1409,6 +1543,7 @@ static const struct drm_ioctl_desc panthor_drm_driver_ioctls[] = {
>> PANTHOR_IOCTL(TILER_HEAP_CREATE, tiler_heap_create, DRM_RENDER_ALLOW),
>> PANTHOR_IOCTL(TILER_HEAP_DESTROY, tiler_heap_destroy, DRM_RENDER_ALLOW),
>> PANTHOR_IOCTL(GROUP_SUBMIT, group_submit, DRM_RENDER_ALLOW),
>> + PANTHOR_IOCTL(PERF_CONTROL, perf_control, DRM_RENDER_ALLOW),
>> };
>>
>> static int panthor_mmap(struct file *filp, struct vm_area_struct *vma)
>> @@ -1518,6 +1653,8 @@ static void panthor_debugfs_init(struct drm_minor *minor)
>> * - 1.2 - adds DEV_QUERY_GROUP_PRIORITIES_INFO query
>> * - adds PANTHOR_GROUP_PRIORITY_REALTIME priority
>> * - 1.3 - adds DRM_PANTHOR_GROUP_STATE_INNOCENT flag
>> + * - 1.4 - adds DEV_QUERY_PERF_INFO query
>> + * - adds PERF_CONTROL ioctl
>> */
>> static const struct drm_driver panthor_drm_driver = {
>> .driver_features = DRIVER_RENDER | DRIVER_GEM | DRIVER_SYNCOBJ |
>> @@ -1531,7 +1668,7 @@ static const struct drm_driver panthor_drm_driver = {
>> .name = "panthor",
>> .desc = "Panthor DRM driver",
>> .major = 1,
>> - .minor = 3,
>> + .minor = 4,
>>
>> .gem_create_object = panthor_gem_create_object,
>> .gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table,
>> --
>> 2.33.0.dirty
>
>
> Adrian Larumbe
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