[AMD Official Use Only - General]
> -----Original Message-----
> From: Zhou1, Tao <tao.zh...@amd.com>
> Sent: Thursday, February 16, 2023 3:58 PM
> To: amd-gfx@lists.freedesktop.org; Zhang, Hawking
> <hawking.zh...@amd.com>; Yang, Stanley <stanley.y...@amd.com>; Chai,
> Thomas <yipeng.c...@amd.com>; Li, Candice <candice...@amd.com>; Lazar,
> Lijo <lijo.la...@amd.com>
> Cc: Zhou1, Tao <tao.zh...@amd.com>
> Subject: [PATCH] drm/amdgpu: don't increase UMC RAS UE count if no new
> bad page
>
> If a UMC bad page is reserved but not freed by an application, the application
> may trigger uncorrectable error repeatly by accessing the page.
>
> v2: add specific function to do the check.
>
> Signed-off-by: Tao Zhou <tao.zh...@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 24
> ++++++++++++++++++++++++
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h | 2 ++
> drivers/gpu/drm/amd/amdgpu/amdgpu_umc.c | 4 ++++
> 3 files changed, 30 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> index 6e543558386d..5214034e1b16 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> @@ -2115,6 +2115,30 @@ int amdgpu_ras_save_bad_pages(struct
> amdgpu_device *adev)
> return 0;
> }
>
> +/* Return false if all pages have been reserved before, no new bad page
> + * is found, otherwise return true.
> + * Note: the function should be called between
> amdgpu_ras_add_bad_pages
> + * and amdgpu_ras_save_bad_pages.
> + */
> +bool amdgpu_ras_new_bad_page_is_added(struct amdgpu_device *adev)
> {
> + struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
> + struct ras_err_handler_data *data;
> + struct amdgpu_ras_eeprom_control *control;
> + int save_count;
> +
> + if (!con || !con->eh_data)
> + return false;
> +
> + mutex_lock(&con->recovery_lock);
> + control = &con->eeprom_control;
> + data = con->eh_data;
> + save_count = data->count - control->ras_num_recs;
> + mutex_unlock(&con->recovery_lock);
> +
> + return (save_count ? true : false);
> +}
> +
> /*
> * read error record array in eeprom and reserve enough space for
> * storing new bad pages
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> index f2ad999993f6..606b75c36848 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> @@ -549,6 +549,8 @@ int amdgpu_ras_add_bad_pages(struct
> amdgpu_device *adev,
>
> int amdgpu_ras_save_bad_pages(struct amdgpu_device *adev);
>
> +bool amdgpu_ras_new_bad_page_is_added(struct amdgpu_device *adev);
> +
> static inline enum ta_ras_block
> amdgpu_ras_block_to_ta(enum amdgpu_ras_block block) {
> switch (block) {
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_umc.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_umc.c
> index 1c7fcb4f2380..1146e65c22be 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_umc.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_umc.c
> @@ -147,6 +147,10 @@ static int amdgpu_umc_do_page_retirement(struct
> amdgpu_device *adev,
> err_data->err_addr_cnt) {
> amdgpu_ras_add_bad_pages(adev, err_data-
> >err_addr,
> err_data->err_addr_cnt);
> + /* if no new bad page is found, no need to increase
> ue count */
> + if (!amdgpu_ras_new_bad_page_is_added(adev))
> + err_data->ue_count = 0;
[Stanley]: There is a scenario, a UMC bad page is reserved but not freed by an
application, the application accesses the above reserved page and it also
accesses a new bad page, driver read 2 ue count but save one new bad page, the
err_data->ue_count should be set to 1.
> +
> amdgpu_ras_save_bad_pages(adev);
>
> amdgpu_dpm_send_hbm_bad_pages_num(adev,
> con->eeprom_control.ras_num_recs);
> --
> 2.35.1
