[PATCH v3 2/2] drm/amdgpu: Add work function for GPU reset event

André Almeida
2022-11-25T17:52:47Z

Add a work function to send a GPU reset uevent and scheduled it during
a GPU reset.

Co-developed-by: Shashank Sharma <shashank.sharma@amd.com>
Signed-off-by: Shashank Sharma <shashank.sharma@amd.com>
Signed-off-by: André Almeida <andrealmeid@igalia.com>
---
V3:
- Merge two last commits

V2: Addressed review comments from Christian
- Changed the name of the work to gpu_reset_event_work
- Added a structure to accommodate some additional information
(like a PID and some flags)
- Do not add new structure in amdgpu.h
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 4 +++
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 30 ++++++++++++++++++++++
2 files changed, 34 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 6b74df446694..88cb5b739c5d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -60,6 +60,8 @@
#include <drm/amdgpu_drm.h>
#include <drm/drm_gem.h>
#include <drm/drm_ioctl.h>
+#include <drm/gpu_scheduler.h>
+#include <drm/drm_sysfs.h>

#include <kgd_kfd_interface.h>
#include "dm_pp_interface.h"
@@ -1003,6 +1005,7 @@ struct amdgpu_device {

int asic_reset_res;
struct work_struct xgmi_reset_work;
+ struct work_struct gpu_reset_event_work;
struct list_head reset_list;

long gfx_timeout;
@@ -1036,6 +1039,7 @@ struct amdgpu_device {
pci_channel_state_t pci_channel_state;

struct amdgpu_reset_control *reset_cntl;
+ struct drm_reset_event_info reset_event_info;
uint32_t ip_versions[MAX_HWIP][HWIP_MAX_INSTANCE];

bool ram_is_direct_mapped;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index b2b1c66bfe39..d04541fdb606 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -77,6 +77,7 @@
#include <linux/pm_runtime.h>

#include <drm/drm_drv.h>
+#include <drm/drm_sysfs.h>

MODULE_FIRMWARE("amdgpu/vega10_gpu_info.bin");
MODULE_FIRMWARE("amdgpu/vega12_gpu_info.bin");
@@ -3365,6 +3366,19 @@ bool amdgpu_device_has_dc_support(struct amdgpu_device *adev)
return amdgpu_device_asic_has_dc_support(adev->asic_type);
}

+static void amdgpu_device_reset_event_func(struct work_struct *__work)
+{
+ struct amdgpu_device *adev = container_of(__work, struct amdgpu_device,
+ gpu_reset_event_work);
+ /*
+ * A GPU reset has happened, inform the userspace and pass the reset
+ * related information
+ */
+ drm_sysfs_reset_event(&adev->ddev, &adev->reset_event_info);
+
+ put_pid(adev->reset_event_info.pid);
+}
+
static void amdgpu_device_xgmi_reset_func(struct work_struct *__work)
{
struct amdgpu_device *adev =
@@ -3616,6 +3630,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
amdgpu_device_delay_enable_gfx_off);

INIT_WORK(&adev->xgmi_reset_work, amdgpu_device_xgmi_reset_func);
+ INIT_WORK(&adev->gpu_reset_event_work, amdgpu_device_reset_event_func);

adev->gfx.gfx_off_req_count = 1;
adev->gfx.gfx_off_residency = 0;
@@ -4920,6 +4935,21 @@ int amdgpu_do_asic_reset(struct list_head *device_list_handle,
goto out;

vram_lost = amdgpu_device_check_vram_lost(tmp_adev);
+
+ if (reset_context->job && reset_context->job->vm) {
+ tmp_adev->reset_event_info.pid =
+ find_get_pid(reset_context->job->vm->task_info.pid);
+ } else {
+ tmp_adev->reset_event_info.pid = NULL;
+ }
+
+ if (vram_lost)
+ tmp_adev->reset_event_info.flags |=
+ DRM_RESET_EVENT_VRAM_LOST;
+
+ /* Send GPU reset event */
+ schedule_work(&tmp_adev->gpu_reset_event_work);
+
#ifdef CONFIG_DEV_COREDUMP
tmp_adev->reset_vram_lost = vram_lost;
memset(&tmp_adev->reset_task_info, 0,
--
2.38.1