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gpu: nvgpu: add nvgpu_get_v2_user_class()

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Add a function to find the nvgpu_class of the v2 user device nodes. This
is the last entry in the class list, as the devices are created in that
order.

The v2 user class is not defined when MIG is enabled because there are
multiple logical devices; bigger changes would be needed for this.

Jira NVGPU-6788

Change-Id: I2177c1e5b4d0bbec77a4e258391859242b4f20d6
Signed-off-by: Konsta Hölttä <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2674427
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Konsta Hölttä
2022-02-23 12:10:08 +02:00
committed by mobile promotions
parent f11ca4c300
commit beed6d3c2b
2 changed files with 20 additions and 0 deletions
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19
drivers/gpu/nvgpu/os/linux/ioctl.c
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@@ -511,6 +511,8 @@ static int nvgpu_prepare_default_dev_node_class_list(struct gk20a *g,
* V2 device node names hierarchy. * V2 device node names hierarchy.
* This hierarchy will replace above hierarchy in second phase. * This hierarchy will replace above hierarchy in second phase.
* Both legacy and V2 device node hierarchies will co-exist until then. * Both legacy and V2 device node hierarchies will co-exist until then.
*
* Note: nvgpu_get_v2_user_class() assumes this order in the class list.
*/ */
if (g->pci_class != 0U) { if (g->pci_class != 0U) {
if (power_node) { if (power_node) {
@@ -546,6 +548,23 @@ static int nvgpu_prepare_default_dev_node_class_list(struct gk20a *g,
return 0; return 0;
} }
struct nvgpu_class *nvgpu_get_v2_user_class(struct gk20a *g)
{
struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
struct nvgpu_class *class;
if (nvgpu_grmgr_is_multi_gr_enabled(g)) {
/* Ambiguous with multiple fractional GPUs */
return NULL;
}
nvgpu_assert(!nvgpu_list_empty(&l->class_list_head));
/* this must match nvgpu_prepare_default_dev_node_class_list() */
class = nvgpu_list_last_entry(&l->class_list_head, nvgpu_class, list_entry);
nvgpu_assert(!class->power_node);
return class;
}
static int nvgpu_prepare_dev_node_class_list(struct gk20a *g, u32 *num_classes, static int nvgpu_prepare_dev_node_class_list(struct gk20a *g, u32 *num_classes,
bool power_node) bool power_node)
{ {

1
drivers/gpu/nvgpu/os/linux/ioctl.h
View File

@@ -80,5 +80,6 @@ int nvgpu_create_device(
const char *cdev_name, const char *cdev_name,
struct cdev *cdev, struct device **out, struct cdev *cdev, struct device **out,
struct nvgpu_class *class); struct nvgpu_class *class);
struct nvgpu_class *nvgpu_get_v2_user_class(struct gk20a *g);
#endif #endif