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gpu: nvgpu: split away power node removal

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Presently, gk20a_user_deinit is used to remove all device nodes
including "power" node as well.

Split removal of power node into a separate function
gk20a_power_node_deinit to enable other device removal during the
normal runtime_suspend path to facilitate the fast path for MIG
reconfiguration. Powernode can be removed only during a call to
Rmmod. This also enables separately powering off the device nodes
in the unlikely case of a poweron failure.

Bug 3308828
Jira NVGPU-6920

Change-Id: Ib045a09a992a63c468492a837b273cca41e20f15
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2543014
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: svc_kernel_abi <svc_kernel_abi@nvidia.com>
Reviewed-by: Dinesh T <dt@nvidia.com>
Reviewed-by: Lakshmanan M <lm@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Debarshi Dutta
2021-06-11 11:40:07 +05:30
committed by mobile promotions
parent a1d0957a9b
commit 8f9ac1dea9
5 changed files with 63 additions and 35 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/nvgpu/os/linux/driver_common.c
View File

@@ -307,7 +307,7 @@ int nvgpu_probe(struct gk20a *g,
* need to be removed.
*/
if (platform->platform_chip_id == TEGRA_210) {
err = gk20a_user_init(dev);
err = gk20a_user_nodes_init(dev);
if (err)
return err;
l->dev_nodes_created = true;

52
drivers/gpu/nvgpu/os/linux/ioctl.c
View File

@@ -298,38 +298,58 @@ static int gk20a_create_device(
return 0;
}
void gk20a_user_deinit(struct device *dev)
void gk20a_remove_devices_and_classes(struct gk20a *g, bool power_node)
{
struct gk20a *g = gk20a_from_dev(dev);
struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
struct nvgpu_cdev *cdev, *n;
struct nvgpu_class *class, *p;
nvgpu_list_for_each_entry_safe(cdev, n, &l->cdev_list_head, nvgpu_cdev, list_entry) {
nvgpu_list_del(&cdev->list_entry);
class = cdev->class;
if (class->power_node != power_node)
continue;
device_destroy(cdev->class, cdev->cdev.dev);
nvgpu_list_del(&cdev->list_entry);
device_destroy(nvgpu_class_get_class(cdev->class), cdev->cdev.dev);
cdev_del(&cdev->cdev);
nvgpu_kfree(g, cdev);
}
nvgpu_list_for_each_entry_safe(class, p, &l->class_list_head, nvgpu_class, list_entry) {
if (class->power_node != power_node)
continue;
nvgpu_list_del(&class->list_entry);
class_destroy(class->class);
nvgpu_kfree(g, class);
}
}
void gk20a_power_node_deinit(struct device *dev)
{
struct gk20a *g = gk20a_from_dev(dev);
struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
gk20a_remove_devices_and_classes(g, true);
if (l->power_cdev_region) {
unregister_chrdev_region(l->power_cdev_region, l->power_cdevs);
}
}
void gk20a_user_nodes_deinit(struct device *dev)
{
struct gk20a *g = gk20a_from_dev(dev);
struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
gk20a_remove_devices_and_classes(g, false);
if (l->cdev_region) {
unregister_chrdev_region(l->cdev_region, l->num_cdevs);
l->num_cdevs = 0;
}
nvgpu_list_for_each_entry_safe(class, p, &l->class_list_head, nvgpu_class, list_entry) {
nvgpu_list_del(&class->list_entry);
class_destroy(class->class);
nvgpu_kfree(g, class);
}
l->dev_nodes_created = false;
}
@@ -585,7 +605,7 @@ int gk20a_power_node_init(struct device *dev)
goto fail;
}
cdev->class = class->class;
cdev->class = class;
nvgpu_init_list_node(&cdev->list_entry);
nvgpu_list_add(&cdev->list_entry, &l->cdev_list_head);
}
@@ -593,12 +613,12 @@ int gk20a_power_node_init(struct device *dev)
l->power_cdevs = total_cdevs;
return 0;
fail:
gk20a_user_deinit(dev);
gk20a_power_node_deinit(dev);
return err;
}
int gk20a_user_init(struct device *dev)
int gk20a_user_nodes_init(struct device *dev)
{
int err;
dev_t devno;
@@ -672,7 +692,7 @@ int gk20a_user_init(struct device *dev)
goto fail;
}
cdev->class = class->class;
cdev->class = class;
nvgpu_init_list_node(&cdev->list_entry);
nvgpu_list_add(&cdev->list_entry, &l->cdev_list_head);
}
@@ -682,7 +702,7 @@ int gk20a_user_init(struct device *dev)
return 0;
fail:
gk20a_user_deinit(dev);
gk20a_user_nodes_deinit(dev);
return err;
}

32
drivers/gpu/nvgpu/os/linux/ioctl.h
View File

@@ -21,10 +21,25 @@
struct device;
struct class;
struct nvgpu_class {
struct class *class;
struct nvgpu_list_node list_entry;
struct nvgpu_cdev_class_priv_data *priv_data;
enum nvgpu_mig_gpu_instance_type instance_type;
bool power_node;
};
static inline struct class *nvgpu_class_get_class(struct nvgpu_class *class)
{
return class->class;
}
struct nvgpu_cdev {
struct cdev cdev;
struct device *node;
struct class *class;
struct nvgpu_class *class;
struct nvgpu_list_node list_entry;
};
@@ -43,16 +58,6 @@ struct nvgpu_cdev_class_priv_data {
bool pci;
};
struct nvgpu_class {
struct class *class;
struct nvgpu_list_node list_entry;
struct nvgpu_cdev_class_priv_data *priv_data;
enum nvgpu_mig_gpu_instance_type instance_type;
bool power_node;
};
static inline struct nvgpu_class *
nvgpu_class_from_list_entry(struct nvgpu_list_node *node)
{
@@ -60,9 +65,10 @@ nvgpu_class_from_list_entry(struct nvgpu_list_node *node)
((uintptr_t)node - offsetof(struct nvgpu_class, list_entry));
};
int gk20a_user_init(struct device *dev);
int gk20a_user_nodes_init(struct device *dev);
int gk20a_power_node_init(struct device *dev);
void gk20a_user_deinit(struct device *dev);
void gk20a_user_nodes_deinit(struct device *dev);
void gk20a_power_node_deinit(struct device *dev);
struct gk20a *nvgpu_get_gk20a_from_cdev(struct nvgpu_cdev *cdev);
u32 nvgpu_get_gpu_instance_id_from_cdev(struct gk20a *g, struct nvgpu_cdev *cdev);

8
drivers/gpu/nvgpu/os/linux/module.c
View File

@@ -442,7 +442,7 @@ int gk20a_pm_finalize_poweron(struct device *dev)
}
if (!l->dev_nodes_created) {
err = gk20a_user_init(dev);
err = gk20a_user_nodes_init(dev);
if (err) {
goto done;
}
@@ -542,7 +542,7 @@ done:
nvgpu_disable_irqs(g);
nvgpu_remove_sim_support_linux(g);
if (l->dev_nodes_created) {
gk20a_user_deinit(dev);
gk20a_user_nodes_deinit(dev);
}
}
@@ -1783,7 +1783,9 @@ int nvgpu_remove(struct device *dev)
nvgpu_clk_arb_cleanup_arbiter(g);
gk20a_user_deinit(dev);
gk20a_user_nodes_deinit(dev_from_gk20a(g));
gk20a_power_node_deinit(dev_from_gk20a(g));
gk20a_debug_deinit(g);

4
drivers/gpu/nvgpu/os/linux/vgpu/vgpu_linux.c
View File

@@ -217,7 +217,7 @@ int vgpu_pm_finalize_poweron(struct device *dev)
goto done;
if (!l->dev_nodes_created) {
err = gk20a_user_init(dev);
err = gk20a_user_nodes_init(dev);
if (err) {
goto done;
}
@@ -509,7 +509,7 @@ int vgpu_remove(struct platform_device *pdev)
vgpu_comm_deinit();
gk20a_sched_ctrl_cleanup(g);
gk20a_user_deinit(dev);
gk20a_user_nodes_deinit(dev);
vgpu_remove_sysfs(dev);
gk20a_get_platform(dev)->g = NULL;
nvgpu_put(g);