[AMD Official Use Only - Internal Distribution Only]
It seems I can not directly reuse the reset HW function inside the
amdgpu_do_asic_reset, the synchronization is based on hive->tb, but as
explained , we actually don't know the GPU belongs to which hive and will
rebuild the correct hive info inside the amdgpu_do_asic_reset function with
amdgpu_xgmi_add_device . so I need to remove all GPUs from the hive first .
This will lead to the sync don't work since the hive->tb will be removed as
well when all GPUs are removed .
Thanks
shaopyunliu
-----Original Message-----
From: amd-gfx <amd-gfx-boun...@lists.freedesktop.org> On Behalf Of Liu, Shaoyun
Sent: Saturday, March 6, 2021 3:41 PM
To: Grodzovsky, Andrey <andrey.grodzov...@amd.com>;
amd-gfx@lists.freedesktop.org
Subject: RE: [PATCH 5/5] drm/amdgpu: Reset the devices in the XGMI hive duirng
probe
[AMD Official Use Only - Internal Distribution Only]
I call the amdgpu_do_asic_reset with the parameter skip_hw_reset = true so the
reset won't be execute twice . but probably I can set this parameter to true
and remove the code schedule for reset since now I already build the
device_list not based on hive. Let me try that .
For the schedule delayed work thread with AMDGPU_RESUME_MS, It's actually not
wait for SMU to start. As I explained , I need to reset the all the GPUs in
the system since I don't know which gpus belongs to which hive. So this time
is allow system to probe all the GPUs in the system which means when this
delayed thread starts , we can assume all the devices already been populated
in mgpu_info.
Regards
Shaoyun.liu
-----Original Message-----
From: Grodzovsky, Andrey <andrey.grodzov...@amd.com>
Sent: Saturday, March 6, 2021 1:09 AM
To: Liu, Shaoyun <shaoyun....@amd.com>; amd-gfx@lists.freedesktop.org
Subject: Re: [PATCH 5/5] drm/amdgpu: Reset the devices in the XGMI hive duirng
probe
Thanks for explaining this, one thing I still don't understand is why you
schedule the reset work explicilty in the begining of
amdgpu_drv_delayed_reset_work_handler and then also call amdgpu_do_asic_reset
which will do the same thing too. It looks like the physical reset will execute
twice for each device.
Another thing is, more like improvement suggestion - currently you schedule
delayed_reset_work using AMDGPU_RESUME_MS - so i guesss this should give enough
time for SMU to start ? Is there maybe a way to instead poll for SMU start
completion and then execute this - some SMU status registers maybe ? Just to
avoid relying on this arbitrary value.
Andrey
On 2021-03-05 8:37 p.m., Liu, Shaoyun wrote:
> [AMD Official Use Only - Internal Distribution Only]
>
> Hi, Andrey
> The existing reset function (amdgpu_device_gpu_recover or amd do_asic _reset)
> assumed driver already have the correct hive info . But in my case, it's
> not true . The gpus are in a bad state and the XGMI TA might not functional
> properly , so driver can not get the hive and node info when probe the
> device . It means driver even don't know the device belongs to which hive
> on a system with multiple hive configuration (ex, 8 gpus in two hive). The
> only solution I can think of is let driver trigger the reset on all gpus at
> the same time after driver do the minimum initialization on the HW ( bring up
> the SMU IP) no matter they belongs to the same hive or not and call
> amdgpu_xgmi_add_device for each device after re-init .
> The 100 ms delay added after the baco reset . I think they can be removed .
> let me verify it.
>
> Regards
> Shaoyun.liu
>
>
>
> -----Original Message-----
> From: Grodzovsky, Andrey <andrey.grodzov...@amd.com>
> Sent: Friday, March 5, 2021 2:27 PM
> To: Liu, Shaoyun <shaoyun....@amd.com>; amd-gfx@lists.freedesktop.org
> Subject: Re: [PATCH 5/5] drm/amdgpu: Reset the devices in the XGMI
> hive duirng probe
>
>
>
> On 2021-03-05 12:52 p.m., shaoyunl wrote:
>> In passthrough configuration, hypervisior will trigger the
>> SBR(Secondary bus reset) to the devices without sync to each other.
>> This could cause device hang since for XGMI configuration, all the
>> devices within the hive need to be reset at a limit time slot. This
>> serial of patches try to solve this issue by co-operate with new SMU
>> which will only do minimum house keeping to response the SBR request
>> but don't do the real reset job and leave it to driver. Driver need
>> to do the whole sw init and minimum HW init to bring up the SMU and
>> trigger the reset(possibly BACO) on all the ASICs at the same time
>>
>> Signed-off-by: shaoyunl <shaoyun....@amd.com>
>> Change-Id: I34e838e611b7623c7ad824704c7ce350808014fc
>> ---
>> drivers/gpu/drm/amd/amdgpu/amdgpu.h | 13 +++
>> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 102 +++++++++++++++------
>> drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 71 ++++++++++++++
>> drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h | 1 +
>> drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c | 8 +-
>> 5 files changed, 165 insertions(+), 30 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>> index d46d3794699e..5602c6edee97 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>> @@ -125,6 +125,10 @@ struct amdgpu_mgpu_info
>> uint32_t num_gpu;
>> uint32_t num_dgpu;
>> uint32_t num_apu;
>> +
>> + /* delayed reset_func for XGMI configuration if necessary */
>> + struct delayed_work delayed_reset_work;
>> + bool pending_reset;
>> };
>>
>> #define AMDGPU_MAX_TIMEOUT_PARAM_LENGTH 256
>> @@ -1124,6 +1128,15 @@ void amdgpu_device_indirect_wreg64(struct
>> amdgpu_device *adev,
>> bool amdgpu_device_asic_has_dc_support(enum amd_asic_type asic_type);
>> bool amdgpu_device_has_dc_support(struct amdgpu_device *adev);
>>
>> +int amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
>> + struct amdgpu_job *job,
>> + bool *need_full_reset_arg);
>> +
>> +int amdgpu_do_asic_reset(struct amdgpu_hive_info *hive,
>> + struct list_head *device_list_handle,
>> + bool *need_full_reset_arg,
>> + bool skip_hw_reset);
>> +
>> int emu_soc_asic_init(struct amdgpu_device *adev);
>>
>> /*
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> index 3c35b0c1e710..5b520f70e660 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> @@ -1220,6 +1220,10 @@ bool amdgpu_device_need_post(struct amdgpu_device
>> *adev)
>> }
>> }
>>
>> + /* Don't post if we need to reset whole hive on init */
>> + if (adev->gmc.xgmi.pending_reset)
>> + return false;
>> +
>> if (adev->has_hw_reset) {
>> adev->has_hw_reset = false;
>> return true;
>> @@ -2149,6 +2153,9 @@ static int amdgpu_device_fw_loading(struct
>> amdgpu_device *adev)
>> if (adev->ip_blocks[i].version->type !=
>> AMD_IP_BLOCK_TYPE_PSP)
>> continue;
>>
>> + if (!adev->ip_blocks[i].status.sw)
>> + continue;
>> +
>> /* no need to do the fw loading again if already done*/
>> if (adev->ip_blocks[i].status.hw == true)
>> break;
>> @@ -2289,7 +2296,10 @@ static int amdgpu_device_ip_init(struct
>> amdgpu_device *adev)
>>
>> if (adev->gmc.xgmi.num_physical_nodes > 1)
>> amdgpu_xgmi_add_device(adev);
>> - amdgpu_amdkfd_device_init(adev);
>> +
>> + /* Don't init kfd if whole hive need to be reset during init */
>> + if (!adev->gmc.xgmi.pending_reset)
>> + amdgpu_amdkfd_device_init(adev);
>>
>> amdgpu_fru_get_product_info(adev);
>>
>> @@ -2734,6 +2744,16 @@ static int amdgpu_device_ip_suspend_phase2(struct
>> amdgpu_device *adev)
>> adev->ip_blocks[i].status.hw = false;
>> continue;
>> }
>> +
>> + /* skip unnecessary suspend if we do not initialize them yet */
>> + if (adev->gmc.xgmi.pending_reset &&
>> + !(adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_GMC
>> ||
>> + adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_SMC
>> ||
>> + adev->ip_blocks[i].version->type ==
>> AMD_IP_BLOCK_TYPE_COMMON ||
>> + adev->ip_blocks[i].version->type ==
>> AMD_IP_BLOCK_TYPE_IH)) {
>> + adev->ip_blocks[i].status.hw = false;
>> + continue;
>> + }
>> /* XXX handle errors */
>> r = adev->ip_blocks[i].version->funcs->suspend(adev);
>> /* XXX handle errors */
>> @@ -3407,10 +3427,28 @@ int amdgpu_device_init(struct amdgpu_device *adev,
>> * E.g., driver was not cleanly unloaded previously, etc.
>> */
>> if (!amdgpu_sriov_vf(adev) && amdgpu_asic_need_reset_on_init(adev)) {
>> - r = amdgpu_asic_reset(adev);
>> - if (r) {
>> - dev_err(adev->dev, "asic reset on init failed\n");
>> - goto failed;
>> + if (adev->gmc.xgmi.num_physical_nodes) {
>> + dev_info(adev->dev, "Pending hive reset.\n");
>> + adev->gmc.xgmi.pending_reset = true;
>> + /* Only need to init necessary block for SMU to handle
>> the reset */
>> + for (i = 0; i < adev->num_ip_blocks; i++) {
>> + if (!adev->ip_blocks[i].status.valid)
>> + continue;
>> + if (!(adev->ip_blocks[i].version->type ==
>> AMD_IP_BLOCK_TYPE_GMC ||
>> + adev->ip_blocks[i].version->type ==
>> AMD_IP_BLOCK_TYPE_COMMON ||
>> + adev->ip_blocks[i].version->type ==
>> AMD_IP_BLOCK_TYPE_IH ||
>> + adev->ip_blocks[i].version->type ==
>> AMD_IP_BLOCK_TYPE_SMC)) {
>> + DRM_DEBUG("IP %s disabed for
>> hw_init.\n",
>> +
>> adev->ip_blocks[i].version->funcs->name);
>> + adev->ip_blocks[i].status.hw = true;
>> + }
>> + }
>> + } else {
>> + r = amdgpu_asic_reset(adev);
>> + if (r) {
>> + dev_err(adev->dev, "asic reset on init
>> failed\n");
>> + goto failed;
>> + }
>> }
>> }
>>
>> @@ -3541,19 +3579,19 @@ int amdgpu_device_init(struct amdgpu_device *adev,
>> /* enable clockgating, etc. after ib tests, etc. since some blocks
>> require
>> * explicit gating rather than handling it automatically.
>> */
>> - r = amdgpu_device_ip_late_init(adev);
>> - if (r) {
>> - dev_err(adev->dev, "amdgpu_device_ip_late_init failed\n");
>> - amdgpu_vf_error_put(adev,
>> AMDGIM_ERROR_VF_AMDGPU_LATE_INIT_FAIL, 0, r);
>> - goto failed;
>> + if (!adev->gmc.xgmi.pending_reset) {
>> + r = amdgpu_device_ip_late_init(adev);
>> + if (r) {
>> + dev_err(adev->dev, "amdgpu_device_ip_late_init
>> failed\n");
>> + amdgpu_vf_error_put(adev,
>> AMDGIM_ERROR_VF_AMDGPU_LATE_INIT_FAIL, 0, r);
>> + goto failed;
>> + }
>> + /* must succeed. */
>> + amdgpu_ras_resume(adev);
>> + queue_delayed_work(system_wq, &adev->delayed_init_work,
>> + msecs_to_jiffies(AMDGPU_RESUME_MS));
>> }
>>
>> - /* must succeed. */
>> - amdgpu_ras_resume(adev);
>> -
>> - queue_delayed_work(system_wq, &adev->delayed_init_work,
>> - msecs_to_jiffies(AMDGPU_RESUME_MS));
>> -
>> if (amdgpu_sriov_vf(adev))
>> flush_delayed_work(&adev->delayed_init_work);
>>
>> @@ -3570,6 +3608,10 @@ int amdgpu_device_init(struct amdgpu_device *adev,
>> if (amdgpu_device_cache_pci_state(adev->pdev))
>> pci_restore_state(pdev);
>>
>> + if (adev->gmc.xgmi.pending_reset)
>> + queue_delayed_work(system_wq, &mgpu_info.delayed_reset_work,
>> + msecs_to_jiffies(AMDGPU_RESUME_MS));
>> +
>> return 0;
>>
>> failed:
>> @@ -4240,14 +4282,16 @@ bool amdgpu_device_should_recover_gpu(struct
>> amdgpu_device *adev)
>> }
>>
>>
>> -static int amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
>> - struct amdgpu_job *job,
>> - bool *need_full_reset_arg)
>> +int amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
>> + struct amdgpu_job *job,
>> + bool *need_full_reset_arg)
>> {
>> int i, r = 0;
>> bool need_full_reset = *need_full_reset_arg;
>>
>> - amdgpu_debugfs_wait_dump(adev);
>> + /* no need to dump if device is not in good state during probe period */
>> + if (!adev->gmc.xgmi.pending_reset)
>> + amdgpu_debugfs_wait_dump(adev);
>>
>> if (amdgpu_sriov_vf(adev)) {
>> /* stop the data exchange thread */ @@ -4293,10 +4337,10 @@
>> static int amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
>> return r;
>> }
>>
>> -static int amdgpu_do_asic_reset(struct amdgpu_hive_info *hive,
>> - struct list_head *device_list_handle,
>> - bool *need_full_reset_arg,
>> - bool skip_hw_reset)
>> +int amdgpu_do_asic_reset(struct amdgpu_hive_info *hive,
>> + struct list_head *device_list_handle,
>> + bool *need_full_reset_arg,
>> + bool skip_hw_reset)
>> {
>> struct amdgpu_device *tmp_adev = NULL;
>> bool need_full_reset = *need_full_reset_arg, vram_lost = false;
>> @@
>> -4310,6 +4354,7 @@ static int amdgpu_do_asic_reset(struct amdgpu_hive_info
>> *hive,
>> list_for_each_entry(tmp_adev, device_list_handle, reset_list) {
>> /* For XGMI run all resets in parallel to speed up the
>> process */
>> if (tmp_adev->gmc.xgmi.num_physical_nodes > 1) {
>> + tmp_adev->gmc.xgmi.pending_reset = false;
>> if (!queue_work(system_unbound_wq,
>> &tmp_adev->xgmi_reset_work))
>> r = -EALREADY;
>> } else
>> @@ -4348,10 +4393,10 @@ static int amdgpu_do_asic_reset(struct
>> amdgpu_hive_info *hive,
>> list_for_each_entry(tmp_adev, device_list_handle, reset_list) {
>> if (need_full_reset) {
>> /* post card */
>> - if (amdgpu_device_asic_init(tmp_adev))
>> + r = amdgpu_device_asic_init(tmp_adev);
>> + if (r) {
>> dev_warn(tmp_adev->dev, "asic atom init
>> failed!");
>> -
>> - if (!r) {
>> + } else {
>> dev_info(tmp_adev->dev, "GPU reset succeeded,
>> trying to resume\n");
>> r = amdgpu_device_ip_resume_phase1(tmp_adev);
>> if (r)
>> @@ -4384,6 +4429,9 @@ static int amdgpu_do_asic_reset(struct
>> amdgpu_hive_info *hive,
>> */
>> amdgpu_register_gpu_instance(tmp_adev);
>>
>> + if (!hive &&
>> tmp_adev->gmc.xgmi.num_physical_nodes > 1)
>> + amdgpu_xgmi_add_device(tmp_adev);
>> +
>> r = amdgpu_device_ip_late_init(tmp_adev);
>> if (r)
>> goto out;
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> index 253c59e0a100..aebe4bc561ee 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> @@ -44,6 +44,7 @@
>> #include "amdgpu_amdkfd.h"
>>
>> #include "amdgpu_ras.h"
>> +#include "amdgpu_xgmi.h"
>>
>> /*
>> * KMS wrapper.
>> @@ -167,8 +168,13 @@ uint amdgpu_freesync_vid_mode;
>> int amdgpu_reset_method = -1; /* auto */
>> int amdgpu_num_kcq = -1;
>>
>> +static void amdgpu_drv_delayed_reset_work_handler(struct work_struct
>> +*work);
>> +
>> struct amdgpu_mgpu_info mgpu_info = {
>> .mutex = __MUTEX_INITIALIZER(mgpu_info.mutex),
>> + .delayed_reset_work = __DELAYED_WORK_INITIALIZER(
>> + mgpu_info.delayed_reset_work,
>> + amdgpu_drv_delayed_reset_work_handler, 0),
>> };
>> int amdgpu_ras_enable = -1;
>> uint amdgpu_ras_mask = 0xffffffff; @@ -1297,6 +1303,71 @@
>> amdgpu_pci_shutdown(struct pci_dev *pdev)
>> adev->mp1_state = PP_MP1_STATE_NONE;
>> }
>>
>> +/**
>> + * amdgpu_drv_delayed_reset_work_handler - work handler for reset
>> + *
>> + * @work: work_struct.
>> + */
>> +static void amdgpu_drv_delayed_reset_work_handler(struct work_struct
>> +*work) {
>> + struct list_head device_list;
>> + struct amdgpu_device *adev;
>> + int i, r;
>> + bool need_full_reset = true;
>> +
>> + mutex_lock(&mgpu_info.mutex);
>> + if (mgpu_info.pending_reset == true) {
>> + mutex_unlock(&mgpu_info.mutex);
>> + return;
>> + }
>> + mgpu_info.pending_reset = true;
>> + mutex_unlock(&mgpu_info.mutex);
>> +
>> + for (i = 0; i < mgpu_info.num_dgpu; i++) {
>> + adev = mgpu_info.gpu_ins[i].adev;
>> + r = amdgpu_device_pre_asic_reset(adev, NULL, &need_full_reset);
>
> Why amdgpu_device_pre_asic_reset is needed ?
>
>> + if (r) {
>> + dev_err(adev->dev, "GPU pre asic reset failed with err,
>> %d for drm dev, %s ",
>> + r, adev_to_drm(adev)->unique);
>> + }
>> + if (!queue_work(system_unbound_wq, &adev->xgmi_reset_work))
>> + r = -EALREADY;
>
> amdgpu_do_asic_reset bellow will already schedule xgmi_reset_work for this
> device, what you could do instead is call amdgpu_do_asic_reset for each
> member of the hive and because there is a task barrier in
> amdgpu_device_xgmi_reset_func, it will synchronize all the resets to same
> point in time already.
>
>> + }
>> + msleep(100);
>
> What's the 100ms is wiating for ?
>
>> + for (i = 0; i < mgpu_info.num_dgpu; i++) {
>> + adev = mgpu_info.gpu_ins[i].adev;
>> + adev->gmc.xgmi.pending_reset = false;
>> + flush_work(&adev->xgmi_reset_work);
>> + }
>> +
>> + msleep(100);
>
> Same as above
>
>> + /* reset function will rebuild the xgmi hive info , clear it now */
>> + for (i = 0; i < mgpu_info.num_dgpu; i++)
>> + amdgpu_xgmi_remove_device(mgpu_info.gpu_ins[i].adev);
>> +
>> + INIT_LIST_HEAD(&device_list);
>> +
>> + for (i = 0; i < mgpu_info.num_dgpu; i++)
>> + list_add_tail(&mgpu_info.gpu_ins[i].adev->reset_list,
>> +&device_list);
>> +
>> + /* unregister the GPU first, reset function will add them back */
>> + list_for_each_entry(adev, &device_list, reset_list)
>> + amdgpu_unregister_gpu_instance(adev);
>> +
>> + r = amdgpu_do_asic_reset(NULL, &device_list, &need_full_reset, true);
>> + if (r) {
>> + DRM_ERROR("reinit gpus failure");
>> + return;
>> + }
>> + for (i = 0; i < mgpu_info.num_dgpu; i++) {
>> + adev = mgpu_info.gpu_ins[i].adev;
>> + if (!adev->kfd.init_complete)
>> + amdgpu_amdkfd_device_init(adev);
>> + amdgpu_ttm_set_buffer_funcs_status(adev, true);
>> + }
>> + return;
>> +}
>> +
>> static int amdgpu_pmops_suspend(struct device *dev)
>> {
>> struct drm_device *drm_dev = dev_get_drvdata(dev); diff --git
>> a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
>> index aa0c83776ce0..8c71d84a2fbe 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
>> @@ -149,6 +149,7 @@ struct amdgpu_xgmi {
>> struct list_head head;
>> bool supported;
>> struct ras_common_if *ras_if;
>> + bool pending_reset;
>> };
>>
>> struct amdgpu_gmc {
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
>> index 659b385b27b5..b459ef755ea9 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
>> @@ -492,7 +492,8 @@ int amdgpu_xgmi_add_device(struct amdgpu_device *adev)
>> if (!adev->gmc.xgmi.supported)
>> return 0;
>>
>> - if (amdgpu_device_ip_get_ip_block(adev, AMD_IP_BLOCK_TYPE_PSP)) {
>> + if (!adev->gmc.xgmi.pending_reset &&
>> + amdgpu_device_ip_get_ip_block(adev, AMD_IP_BLOCK_TYPE_PSP)) {
>> ret = psp_xgmi_initialize(&adev->psp);
>> if (ret) {
>> dev_err(adev->dev,
>> @@ -538,7 +539,8 @@ int amdgpu_xgmi_add_device(struct amdgpu_device
>> *adev)
>>
>> task_barrier_add_task(&hive->tb);
>>
>> - if (amdgpu_device_ip_get_ip_block(adev, AMD_IP_BLOCK_TYPE_PSP)) {
>> + if (!adev->gmc.xgmi.pending_reset &&
>> + amdgpu_device_ip_get_ip_block(adev, AMD_IP_BLOCK_TYPE_PSP)) {
>> list_for_each_entry(tmp_adev, &hive->device_list,
>> gmc.xgmi.head) {
>> /* update node list for other device in the hive */
>> if (tmp_adev != adev) {
>> @@ -567,7 +569,7 @@ int amdgpu_xgmi_add_device(struct amdgpu_device *adev)
>> }
>> }
>>
>> - if (!ret)
>> + if (!ret && !adev->gmc.xgmi.pending_reset)
>> ret = amdgpu_xgmi_sysfs_add_dev_info(adev, hive);
>>
>> exit_unlock:
>>
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