linux-kernel - [PATCH v2 3/3] drm/panthor: Enable fdinfo for memory stats

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Message-ID: <20240423213240.91412-4-adrian.larumbe@collabora.com>
Date: Tue, 23 Apr 2024 22:32:36 +0100
From: Adrián Larumbe <adrian.larumbe@...labora.com>
To: 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>,
	Daniel Vetter <daniel@...ll.ch>
Cc: kernel@...labora.com,
	Adrian Larumbe <adrian.larumbe@...labora.com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/3] drm/panthor: Enable fdinfo for memory stats

When vm-binding an already-created BO, the entirety of its virtual size is
then backed by system memory, so its RSS is always the same as its virtual
size.

Also, we consider a PRIME imported BO to be resident if its matching
dma_buf has an open attachment, which means its backing storage had already
been allocated.

Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
---
 drivers/gpu/drm/panthor/panthor_gem.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/panthor/panthor_gem.c b/drivers/gpu/drm/panthor/panthor_gem.c
index d6483266d0c2..386c0dfeeb5f 100644
--- a/drivers/gpu/drm/panthor/panthor_gem.c
+++ b/drivers/gpu/drm/panthor/panthor_gem.c
@@ -143,6 +143,17 @@ panthor_gem_prime_export(struct drm_gem_object *obj, int flags)
 	return drm_gem_prime_export(obj, flags);
 }
 
+static enum drm_gem_object_status panthor_gem_status(struct drm_gem_object *obj)
+{
+	struct panthor_gem_object *bo = to_panthor_bo(obj);
+	enum drm_gem_object_status res = 0;
+
+	if (bo->base.base.import_attach || bo->base.pages)
+		res |= DRM_GEM_OBJECT_RESIDENT;
+
+	return res;
+}
+
 static const struct drm_gem_object_funcs panthor_gem_funcs = {
 	.free = panthor_gem_free_object,
 	.print_info = drm_gem_shmem_object_print_info,
@@ -152,6 +163,7 @@ static const struct drm_gem_object_funcs panthor_gem_funcs = {
 	.vmap = drm_gem_shmem_object_vmap,
 	.vunmap = drm_gem_shmem_object_vunmap,
 	.mmap = panthor_gem_mmap,
+	.status = panthor_gem_status,
 	.export = panthor_gem_prime_export,
 	.vm_ops = &drm_gem_shmem_vm_ops,
 };
-- 
2.44.0