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Date: Thu, 5 Nov 2020 21:16:55 -0500
From: Jeremy Cline <jcline@...hat.com>
To: Ben Skeggs <bskeggs@...hat.com>
Cc: David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, Jeremy Cline <jcline@...hat.com>
Subject: [PATCH 2/3] drm/nouveau: manage nouveau_drm lifetime with devres
Make use of the devm_drm_dev_alloc() API to bind the lifetime of
nouveau_drm structure to the drm_device. This is important because a
reference to nouveau_drm is accessible from drm_device, which is
provided to a number of DRM layer callbacks that can run after the
deallocation of nouveau_drm currently occurs.
Signed-off-by: Jeremy Cline <jcline@...hat.com>
---
drivers/gpu/drm/nouveau/nouveau_drm.c | 44 ++++++++++++---------------
drivers/gpu/drm/nouveau/nouveau_drv.h | 10 ++++--
2 files changed, 26 insertions(+), 28 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index bc6f51bf23b7..f750c25e92f9 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -30,9 +30,11 @@
#include <linux/vga_switcheroo.h>
#include <linux/mmu_notifier.h>
+#include <drm/drm_drv.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_vblank.h>
+#include <drm/drm_managed.h>
#include <core/gpuobj.h>
#include <core/option.h>
@@ -532,13 +534,8 @@ nouveau_parent = {
static int
nouveau_drm_device_init(struct drm_device *dev)
{
- struct nouveau_drm *drm;
int ret;
-
- if (!(drm = kzalloc(sizeof(*drm), GFP_KERNEL)))
- return -ENOMEM;
- dev->dev_private = drm;
- drm->dev = dev;
+ struct nouveau_drm *drm = nouveau_drm(dev);
nvif_parent_ctor(&nouveau_parent, &drm->parent);
drm->master.base.object.parent = &drm->parent;
@@ -620,7 +617,6 @@ nouveau_drm_device_init(struct drm_device *dev)
nouveau_cli_fini(&drm->master);
fail_alloc:
nvif_parent_dtor(&drm->parent);
- kfree(drm);
return ret;
}
@@ -654,7 +650,6 @@ nouveau_drm_device_fini(struct drm_device *dev)
nouveau_cli_fini(&drm->client);
nouveau_cli_fini(&drm->master);
nvif_parent_dtor(&drm->parent);
- kfree(drm);
}
/*
@@ -720,6 +715,7 @@ static int nouveau_drm_probe(struct pci_dev *pdev,
{
struct nvkm_device *device;
struct drm_device *drm_dev;
+ struct nouveau_drm *nv_dev;
int ret;
if (vga_switcheroo_client_probe_defer(pdev))
@@ -750,15 +746,16 @@ static int nouveau_drm_probe(struct pci_dev *pdev,
if (nouveau_atomic)
driver_pci.driver_features |= DRIVER_ATOMIC;
- drm_dev = drm_dev_alloc(&driver_pci, &pdev->dev);
- if (IS_ERR(drm_dev)) {
- ret = PTR_ERR(drm_dev);
+ nv_dev = devm_drm_dev_alloc(&pdev->dev, &driver_stub, typeof(*nv_dev), drm_dev);
+ if (IS_ERR(nv_dev)) {
+ ret = PTR_ERR(nv_dev);
goto fail_nvkm;
}
+ drm_dev = nouveau_to_drm_dev(nv_dev);
ret = pci_enable_device(pdev);
if (ret)
- goto fail_drm;
+ goto fail_nvkm;
drm_dev->pdev = pdev;
pci_set_drvdata(pdev, drm_dev);
@@ -778,8 +775,6 @@ static int nouveau_drm_probe(struct pci_dev *pdev,
nouveau_drm_device_fini(drm_dev);
fail_pci:
pci_disable_device(pdev);
-fail_drm:
- drm_dev_put(drm_dev);
fail_nvkm:
nvkm_device_del(&device);
return ret;
@@ -799,7 +794,6 @@ nouveau_drm_device_remove(struct drm_device *dev)
device = nvkm_device_find(client->device);
nouveau_drm_device_fini(dev);
- drm_dev_put(dev);
nvkm_device_del(&device);
}
@@ -1285,7 +1279,8 @@ nouveau_platform_device_create(const struct nvkm_device_tegra_func *func,
struct platform_device *pdev,
struct nvkm_device **pdevice)
{
- struct drm_device *drm;
+ struct nouveau_drm *nv_dev;
+ struct drm_device *drm_dev;
int err;
err = nvkm_device_tegra_new(func, pdev, nouveau_config, nouveau_debug,
@@ -1293,22 +1288,21 @@ nouveau_platform_device_create(const struct nvkm_device_tegra_func *func,
if (err)
goto err_free;
- drm = drm_dev_alloc(&driver_platform, &pdev->dev);
- if (IS_ERR(drm)) {
- err = PTR_ERR(drm);
+ nv_dev = devm_drm_dev_alloc(&pdev->dev, &driver_platform, typeof(*nv_dev), drm_dev);
+ if (IS_ERR(nv_dev)) {
+ err = PTR_ERR(nv_dev);
goto err_free;
}
+ drm_dev = nouveau_to_drm_dev(nv_dev);
- err = nouveau_drm_device_init(drm);
+ err = nouveau_drm_device_init(drm_dev);
if (err)
- goto err_put;
+ goto err_free;
- platform_set_drvdata(pdev, drm);
+ platform_set_drvdata(pdev, drm_dev);
- return drm;
+ return drm_dev;
-err_put:
- drm_dev_put(drm);
err_free:
nvkm_device_del(pdevice);
diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index 3e2920a10099..cf6c33e52a5c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -137,7 +137,11 @@ struct nouveau_drm {
struct nvif_parent parent;
struct nouveau_cli master;
struct nouveau_cli client;
- struct drm_device *dev;
+
+ /**
+ * @drm_dev: The parent DRM device object.
+ */
+ struct drm_device drm_dev;
struct list_head clients;
@@ -237,7 +241,7 @@ struct nouveau_drm {
static inline struct nouveau_drm *
nouveau_drm(struct drm_device *dev)
{
- return dev->dev_private;
+ return container_of(dev, struct nouveau_drm, drm_dev);
}
/**
@@ -251,7 +255,7 @@ nouveau_drm(struct drm_device *dev)
*/
static inline struct drm_device *
nouveau_to_drm_dev(struct nouveau_drm *nv_dev) {
- return nv_dev->dev;
+ return &nv_dev->drm_dev;
}
/**
--
2.28.0
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