[AMD Official Use Only - Internal Distribution Only]
Hi Guchun,
Please see my comment inline.
> -----Original Message-----
> From: Chen, Guchun <Guchun.Chen@xxxxxxx>
> Sent: Wednesday, July 22, 2020 11:14 AM
> To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx; Deucher, Alexander
> <Alexander.Deucher@xxxxxxx>; Zhang, Hawking
> <Hawking.Zhang@xxxxxxx>; Li, Dennis <Dennis.Li@xxxxxxx>; Yang,
> Stanley <Stanley.Yang@xxxxxxx>; Zhou1, Tao <Tao.Zhou1@xxxxxxx>;
> Clements, John <John.Clements@xxxxxxx>
> Cc: Chen, Guchun <Guchun.Chen@xxxxxxx>
> Subject: [PATCH 2/5] drm/amdgpu: validate bad page threshold in ras
>
> Bad page threshold value should be valid in the range between
> -1 and max records length of eeprom. It could determine when the GPU
> should be retired.
>
> Signed-off-by: Guchun Chen <guchun.chen@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 43
> +++++++++++++++++++
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h | 3 ++
> .../gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c | 5 +++
> .../gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h | 2 +
> 4 files changed, 53 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> index 6f06e1214622..e3d67d85c55f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> @@ -69,6 +69,9 @@ const char *ras_block_string[] = {
> /* inject address is 52 bits */
> #define RAS_UMC_INJECT_ADDR_LIMIT (0x1ULL << 52)
>
> +/* typical ECC bad page rate(1 bad page per 100MB VRAM) */
> +#define RAS_BAD_PAGE_RATE (100 * 1024 * 1024ULL)
> +
> enum amdgpu_ras_retire_page_reservation {
> AMDGPU_RAS_RETIRE_PAGE_RESERVED,
> AMDGPU_RAS_RETIRE_PAGE_PENDING,
> @@ -1700,6 +1703,42 @@ static bool amdgpu_ras_check_bad_page(struct
> amdgpu_device *adev,
> return ret;
> }
>
> +static void amdgpu_ras_validate_threshold(struct amdgpu_device *adev,
> + uint32_t max_length)
> +{
> + struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
> + int tmp_threshold = amdgpu_bad_page_threshold;
> + u64 val;
> +
> + /*
> + * Justification of value bad_page_cnt_threshold in ras structure
> + *
> + * 1. -1 <= amdgpu_bad_page_threshold <= max record length in
> eeprom
> + * 2. if amdgpu_bad_page_threshold = -1,
> + * bad_page_cnt_threshold = typical value by formula.
> + * 3. if amdgpu_bad_page_threshold = 0,
> + * bad_page_cnt_threshold = 0xFFFFFFFF,
> + * and disable RMA feature accordingly.
> + * 4. use the value specified from user when
> (amdgpu_bad_page_threshold
> + * > 0 && < max record length in eeprom).
> + */
> +
> + if (tmp_threshold < -1)
> + tmp_threshold = -1;
> + else if (tmp_threshold > max_length)
> + tmp_threshold = max_length;
> +
> + if (tmp_threshold == -1) {
> + val = adev->gmc.mc_vram_size;
> + do_div(val, RAS_BAD_PAGE_RATE);
> + con->bad_page_cnt_threshold = lower_32_bits(val);
[Yang, Stanley] : It's better to compare con->bad_page_cnt_threshold with max_length,
the value of bad_page_cnt_threshold should not exceed max_length.
> + } else if (tmp_threshold == 0) {
> + con->bad_page_cnt_threshold = 0xFFFFFFFF;
> + } else {
> + con->bad_page_cnt_threshold = tmp_threshold;
> + }
> +}
> +
> /* called in gpu recovery/init */
> int amdgpu_ras_reserve_bad_pages(struct amdgpu_device *adev) { @@ -
> 1777,6 +1816,7 @@ int amdgpu_ras_recovery_init(struct amdgpu_device
> *adev) {
> struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
> struct ras_err_handler_data **data;
> + uint32_t max_eeprom_records_len = 0;
> int ret;
>
> if (con)
> @@ -1795,6 +1835,9 @@ int amdgpu_ras_recovery_init(struct
> amdgpu_device *adev)
> atomic_set(&con->in_recovery, 0);
> con->adev = adev;
>
> + max_eeprom_records_len =
> amdgpu_ras_eeprom_get_record_max_length();
> + amdgpu_ras_validate_threshold(adev, max_eeprom_records_len);
> +
> ret = amdgpu_ras_eeprom_init(&con->eeprom_control);
> if (ret)
> goto free;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> index b2667342cf67..4672649a9293 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> @@ -336,6 +336,9 @@ struct amdgpu_ras {
> struct amdgpu_ras_eeprom_control eeprom_control;
>
> bool error_query_ready;
> +
> + /* bad page count threshold */
> + uint32_t bad_page_cnt_threshold;
> };
>
> struct ras_fs_data {
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> index c0096097bbcf..a2c982b1eac6 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> @@ -499,6 +499,11 @@ int amdgpu_ras_eeprom_process_recods(struct
> amdgpu_ras_eeprom_control *control,
> return ret == num ? 0 : -EIO;
> }
>
> +inline uint32_t amdgpu_ras_eeprom_get_record_max_length(void)
> +{
> + return EEPROM_MAX_RECORD_NUM;
> +}
> +
> /* Used for testing if bugs encountered */ #if 0 void
> amdgpu_ras_eeprom_test(struct amdgpu_ras_eeprom_control *control)
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h
> index 7e8647a05df7..b272840cb069 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h
> @@ -85,6 +85,8 @@ int amdgpu_ras_eeprom_process_recods(struct
> amdgpu_ras_eeprom_control *control,
> bool write,
> int num);
>
> +inline uint32_t amdgpu_ras_eeprom_get_record_max_length(void);
> +
> void amdgpu_ras_eeprom_test(struct amdgpu_ras_eeprom_control
> *control);
>
> #endif // _AMDGPU_RAS_EEPROM_H
> --
> 2.17.1
Regards,
Stanley
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