Please see my comment about the patch organization
> -----Original Message-----
> From: Chen, Guchun <Guchun.Chen@xxxxxxx>
> Sent: Thursday, July 23, 2020 11:39 AM
> To: Zhou1, Tao <Tao.Zhou1@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx;
> Deucher, Alexander <Alexander.Deucher@xxxxxxx>; Zhang, Hawking
> <Hawking.Zhang@xxxxxxx>; Li, Dennis <Dennis.Li@xxxxxxx>; Yang, Stanley
> <Stanley.Yang@xxxxxxx>; Clements, John <John.Clements@xxxxxxx>
> Subject: RE: [PATCH 3/5] drm/amdgpu: conduct bad gpu check during
> bootup/reset
>
> [AMD Public Use]
>
> Thanks for your review, Tao.
> Please check my comments after yours.
>
> Regards,
> Guchun
>
> -----Original Message-----
> From: Zhou1, Tao <Tao.Zhou1@xxxxxxx>
> Sent: Thursday, July 23, 2020 10:51 AM
> To: Chen, Guchun <Guchun.Chen@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx;
> Deucher, Alexander <Alexander.Deucher@xxxxxxx>; Zhang, Hawking
> <Hawking.Zhang@xxxxxxx>; Li, Dennis <Dennis.Li@xxxxxxx>; Yang, Stanley
> <Stanley.Yang@xxxxxxx>; Clements, John <John.Clements@xxxxxxx>
> Subject: RE: [PATCH 3/5] drm/amdgpu: conduct bad gpu check during
> bootup/reset
>
> [AMD Official Use Only - Internal Distribution Only]
>
> > -----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 3/5] drm/amdgpu: conduct bad gpu check during
> > bootup/reset
> >
> > During boot up, when init eeprom, RAS will check if the BAD GPU tag is
> > saved or not. And will break boot up and notify user to RMA it.
> >
> > At the meanwhile, when saved bad page count to eeprom exceeds
> > threshold, one ras recovery will be triggered immediately, and bad gpu
> > check will be executed and reset will fail as well to remind user.
> >
> > User could set bad_page_threshold = 0 as module parameter when probing
> > driver to disable the bad feature check.
> >
> > Signed-off-by: Guchun Chen <guchun.chen@xxxxxxx>
> > ---
> > drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 21 ++++-
> > drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 25 +++++-
> > drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h | 16 +++-
> > .../gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c | 87
> ++++++++++++++++++-
> > .../gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h | 6 +-
> > 5 files changed, 142 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > index 2662cd7c8685..d529bf7917f5 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > @@ -2065,7 +2065,9 @@ static int amdgpu_device_ip_init(struct
> > amdgpu_device *adev)
> > * Note: theoretically, this should be called before all vram allocations
> > * to protect retired page from abusing
> > */
>
> [Tao] The comment above should be also updated [Guchun]yeah, will update it
> later.
>
> > -amdgpu_ras_recovery_init(adev);
> > +r = amdgpu_ras_recovery_init(adev);
> > +if (r)
> > +goto init_failed;
>
> [Tao] Are you sure "r != 0" equals to "bad gpu"? Other errors of recovery_init
> should not block gpu init.
> [Guchun]Good point. This should be addressed carefully.
> >
> > if (adev->gmc.xgmi.num_physical_nodes > 1)
> > amdgpu_xgmi_add_device(adev); @@ -4133,8 +4135,20 @@ static int
> > amdgpu_do_asic_reset(struct amdgpu_hive_info *hive,
> >
> > amdgpu_fbdev_set_suspend(tmp_adev, 0);
> >
> > -/* must succeed. */
> > -amdgpu_ras_resume(tmp_adev);
> > +/*
> > + * The CPU is BAD once faulty pages by ECC has
> > + * reached the threshold, and ras recovery is
> > + * scheduled. So add one check here to prevent
> > + * recovery if it's one BAD GPU, and remind
> > + * user to RMA this GPU.
> > + */
> > +if (!amdgpu_ras_check_bad_gpu(tmp_adev)) {
> > +/* must succeed. */
> > +amdgpu_ras_resume(tmp_adev);
> > +} else {
> > +r = -EINVAL;
> > +goto out;
> > +}
> >
> > /* Update PSP FW topology after reset */ if (hive && tmp_adev-
> > >gmc.xgmi.num_physical_nodes > 1) @@ -4142,7 +4156,6 @@ static int
> > amdgpu_do_asic_reset(struct amdgpu_hive_info *hive, } }
> >
> > -
> > out:
> > if (!r) {
> > amdgpu_irq_gpu_reset_resume_helper(tmp_adev);
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> > index e3d67d85c55f..818d4154e4a3 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> > @@ -62,8 +62,6 @@ const char *ras_block_string[] = { #define
> > ras_err_str(i)
> > (ras_error_string[ffs(i)]) #define ras_block_str(i)
> > (ras_block_string[i])
> >
> > -#define AMDGPU_RAS_FLAG_INIT_BY_VBIOS1 -#define
> > AMDGPU_RAS_FLAG_INIT_NEED_RESET2 #define RAS_DEFAULT_FLAGS
> > (AMDGPU_RAS_FLAG_INIT_BY_VBIOS)
> >
> > /* inject address is 52 bits */
> > @@ -1817,6 +1815,7 @@ 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;
> > +bool bad_gpu = false;
> > int ret;
> >
> > if (con)
> > @@ -1838,9 +1837,14 @@ int amdgpu_ras_recovery_init(struct
> > amdgpu_device
> > *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)
> > +ret = amdgpu_ras_eeprom_init(&con->eeprom_control, &bad_gpu);
> > +/*
> > + * we only fail this calling and halt booting when bad_gpu is true.
> > + */
> > +if (bad_gpu) {
> > +ret = -EINVAL;
> > goto free;
> > +}
> >
> > if (con->eeprom_control.num_recs) {
> > ret = amdgpu_ras_load_bad_pages(adev); @@ -2189,3
> > +2193,16 @@ bool amdgpu_ras_need_emergency_restart(struct
> > amdgpu_device *adev)
> >
> > return false;
> > }
> > +
> > +bool amdgpu_ras_check_bad_gpu(struct amdgpu_device *adev) { struct
> > +amdgpu_ras *con = amdgpu_ras_get_context(adev); bool bad_gpu = false;
> > +
> > +if (con && (con->bad_page_cnt_threshold != 0xFFFFFFFF))
> > +amdgpu_ras_eeprom_check_bad_gpu(&con->eeprom_control,
> > +&bad_gpu);
> > +
> > +/* We are only interested in variable bad_gpu. */ return bad_gpu; }
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> > index 4672649a9293..d7a363b37feb 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> > @@ -31,6 +31,10 @@
> > #include "ta_ras_if.h"
> > #include "amdgpu_ras_eeprom.h"
> >
> > +#define AMDGPU_RAS_FLAG_INIT_BY_VBIOS(0x1 << 0) #define
> > +AMDGPU_RAS_FLAG_INIT_NEED_RESET(0x1 << 1) #define
> > +AMDGPU_RAS_FLAG_SKIP_BAD_PAGE_RESV(0x1 << 2)
> > +
> > enum amdgpu_ras_block {
> > AMDGPU_RAS_BLOCK__UMC = 0,
> > AMDGPU_RAS_BLOCK__SDMA,
> > @@ -493,6 +497,8 @@ void amdgpu_ras_suspend(struct amdgpu_device
> > *adev); unsigned long amdgpu_ras_query_error_count(struct
> > amdgpu_device *adev, bool is_ce);
> >
> > +bool amdgpu_ras_check_bad_gpu(struct amdgpu_device *adev);
> > +
> > /* error handling functions */
> > int amdgpu_ras_add_bad_pages(struct amdgpu_device *adev, struct
> > eeprom_table_record *bps, int pages); @@ -503,10
> > +509,14 @@ static inline int amdgpu_ras_reset_gpu(struct amdgpu_device
> > *adev) {
> > struct amdgpu_ras *ras = amdgpu_ras_get_context(adev);
> >
> > -/* save bad page to eeprom before gpu reset,
> > - * i2c may be unstable in gpu reset
> > +/*
> > + * Save bad page to eeprom before gpu reset, i2c may be unstable
> > + * in gpu reset.
> > + *
> > + * Also, exclude the case when ras recovery issuer is
> > + * eerprom page write.
> > */
> > -if (in_task())
> > +if (!(ras->flags & AMDGPU_RAS_FLAG_SKIP_BAD_PAGE_RESV) &&
> > in_task())
> > amdgpu_ras_reserve_bad_pages(adev);
> >
> > if (atomic_cmpxchg(&ras->in_recovery, 0, 1) == 0) diff --git
> > a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> > index a2c982b1eac6..96b63c026bad 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
>
> [Tao] It's better to split it into two patches, one is for ras and another one is for
> eeprom [Guchun]I tried this, however, even if for ras change, eeprom change is
> needed as well. So I merged them both into one patch.
[Tao] We may need to split it into more parts like this:
Part1: preparation for ras
Part2: preparation for eeprom
Part3: main part for ras
Part4: main part for eeprom
>
> > @@ -46,6 +46,9 @@
> > #define EEPROM_TABLE_HDR_VAL 0x414d4452 #define
> EEPROM_TABLE_VER
> > 0x00010000
> >
> > +/* Bad GPU tag ‘BADG’ */
> > +#define EEPROM_TABLE_HDR_BAD 0x42414447
> > +
> > /* Assume 2 Mbit size */
> > #define EEPROM_SIZE_BYTES 256000
> > #define EEPROM_PAGE__SIZE_BYTES 256
> > @@ -238,12 +241,14 @@ int amdgpu_ras_eeprom_reset_table(struct
> > amdgpu_ras_eeprom_control *control)
> >
> > }
> >
> > -int amdgpu_ras_eeprom_init(struct amdgpu_ras_eeprom_control *control)
> > +int amdgpu_ras_eeprom_init(struct amdgpu_ras_eeprom_control *control,
> > +bool *bad_gpu)
> > {
> > int ret = 0;
> > struct amdgpu_device *adev = to_amdgpu_device(control); unsigned
> > char buff[EEPROM_ADDRESS_SIZE + EEPROM_TABLE_HEADER_SIZE] = { 0 };
> > struct amdgpu_ras_eeprom_table_header *hdr = &control->tbl_hdr;
> > +struct amdgpu_ras *ras = amdgpu_ras_get_context(adev);
> > struct i2c_msg msg = {
> > .addr= 0,
> > .flags= I2C_M_RD,
> > @@ -251,6 +256,8 @@ int amdgpu_ras_eeprom_init(struct
> > amdgpu_ras_eeprom_control *control) .buf= buff, };
> >
> > +*bad_gpu = false;
> > +
> > /* Verify i2c adapter is initialized */ if (!adev->pm.smu_i2c.algo)
> > return -ENOENT; @@ -279,6 +286,11 @@ int amdgpu_ras_eeprom_init(struct
> > amdgpu_ras_eeprom_control *control) DRM_DEBUG_DRIVER("Found
> existing
> > EEPROM table with %d records",
> > control->num_recs);
> >
> > +} else if ((ras->bad_page_cnt_threshold != 0xFFFFFFFF) && (
> > +hdr->header == EEPROM_TABLE_HDR_BAD)) {
> > +*bad_gpu = true;
> > +DRM_ERROR("Detect BAD GPU TAG in eeprom table and "
> > +"GPU shall be RMAed.\n");
> > } else {
> > DRM_INFO("Creating new EEPROM table");
> >
> > @@ -375,6 +387,44 @@ static uint32_t
> > __correct_eeprom_dest_address(uint32_t curr_address) return
> > curr_address; }
> >
> > +int amdgpu_ras_eeprom_check_bad_gpu(struct
> amdgpu_ras_eeprom_control
> > *control,
> > +bool *bad_gpu)
> > +{
> > +struct amdgpu_device *adev = to_amdgpu_device(control); unsigned char
> > +buff[EEPROM_ADDRESS_SIZE + EEPROM_TABLE_HEADER_SIZE] = { 0 }; struct
> > +amdgpu_ras_eeprom_table_header *hdr = &control->tbl_hdr; struct
> > +i2c_msg msg = { .addr = control->i2c_address, .flags = I2C_M_RD, .len
> > += EEPROM_ADDRESS_SIZE +
> > EEPROM_TABLE_HEADER_SIZE,
> > +.buf = buff,
> > +};
> > +int ret;
> > +
> > +*bad_gpu = false;
> > +
> > +/* read EEPROM table header */
> > +mutex_lock(&control->tbl_mutex);
> > +ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1); if (ret < 1) {
> > +dev_err(adev->dev, "Failed to read EEPROM table header.\n"); goto
> > +err;
>
> [Tao] One tab is missed
> [Guchun]Correct this later.
>
> > +}
> > +
> > +__decode_table_header_from_buff(hdr, &buff[2]);
> > +
> > +if (hdr->header == EEPROM_TABLE_HDR_BAD) { dev_warn(adev->dev,
> > +"Current GPU is BAD and should be
> > RMAed.\n");
> > +*bad_gpu = true;
> > +}
> > +
> > +ret = 0;
> > +err:
> > +mutex_unlock(&control->tbl_mutex);
> > +return ret;
> > +}
> > +
> > int amdgpu_ras_eeprom_process_recods(struct amdgpu_ras_eeprom_control
> > *control,
> > struct eeprom_table_record
> > *records,
> > bool write,
> > @@ -383,8 +433,10 @@ int amdgpu_ras_eeprom_process_recods(struct
> > amdgpu_ras_eeprom_control *control,
> > int i, ret = 0;
> > struct i2c_msg *msgs, *msg;
> > unsigned char *buffs, *buff;
> > +bool sched_ras_recovery = false;
> > struct eeprom_table_record *record;
> > struct amdgpu_device *adev = to_amdgpu_device(control);
> > +struct amdgpu_ras *ras = amdgpu_ras_get_context(adev);
> >
> > if (adev->asic_type != CHIP_VEGA20 && adev->asic_type !=
> > CHIP_ARCTURUS)
> > return 0;
> > @@ -402,6 +454,25 @@ int amdgpu_ras_eeprom_process_recods(struct
> > amdgpu_ras_eeprom_control *control,
> > goto free_buff;
> > }
> >
> > +/*
> > + * If saved bad pages number exceeds the bad page threshod for
> > + * the whole VRAM, update table header to mark one BAD GPU and
> > + * schedule one ras recovery after eeprom write is done, this
> > + * can avoid the missing for latest records.
> > + *
> > + * This new header will be picked up and checked in the bootup by
> > + * ras recovery, which may break bootup process to notify user this
> > + * GPU is bad and to RMA(Return Merchandise Authorization) this GPU.
> > + */
> > +if (write && (ras->bad_page_cnt_threshold != 0xFFFFFFFF) &&
> > +((control->num_recs + num) >= ras->bad_page_cnt_threshold)) {
> > +dev_warn(adev->dev, "Saved bad pages(%d) reaches threshold
> > +value(%d).\n",
> > +control->num_recs + num, ras-
> > >bad_page_cnt_threshold);
> > +control->tbl_hdr.header = EEPROM_TABLE_HDR_BAD;
> > +sched_ras_recovery = true;
> > +}
> > +
> > /* In case of overflow just start from beginning to not lose newest
> > records */ if (write && (control->next_addr +
> > EEPROM_TABLE_RECORD_SIZE * num > EEPROM_SIZE_BYTES))
> > control->next_addr = EEPROM_RECORD_START; @@ -482,6
> > +553,20 @@ int amdgpu_ras_eeprom_process_recods(struct
> > amdgpu_ras_eeprom_control *control,
> > __update_tbl_checksum(control, records, num, old_hdr_byte_sum);
> >
> > __update_table_header(control, buffs);
> > +
> > +if (sched_ras_recovery) {
> > +/*
> > + * Before scheduling ras recovery, assert the related
> > + * flag first, which shall bypass common bad page
> > + * reservation execution in amdgpu_ras_reset_gpu.
> > + */
> > +amdgpu_ras_get_context(adev)->flags |=
> > +AMDGPU_RAS_FLAG_SKIP_BAD_PAGE_RESV;
> > +
> > +dev_warn(adev->dev, "Conduct ras recovery due to bad
> > "
> > +"page threshold reached.\n");
> > +amdgpu_ras_reset_gpu(adev);
> > +}
> > } else if (!__validate_tbl_checksum(control, records, num)) {
> > DRM_WARN("EEPROM Table checksum mismatch!");
> > /* TODO Uncomment when EEPROM read/write is relliable */ diff --git
> > a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h
> > index b272840cb069..4ccd139248a9 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h
> > @@ -77,9 +77,13 @@ struct eeprom_table_record { unsigned char
> > mcumc_id; }__attribute__((__packed__));
> >
> > -int amdgpu_ras_eeprom_init(struct amdgpu_ras_eeprom_control
> > *control);
> > +int amdgpu_ras_eeprom_init(struct amdgpu_ras_eeprom_control *control,
> > +bool *bad_gpu);
> > int amdgpu_ras_eeprom_reset_table(struct amdgpu_ras_eeprom_control
> > *control);
> >
> > +int amdgpu_ras_eeprom_check_bad_gpu(struct
> amdgpu_ras_eeprom_control
> > *control,
> > +bool *bad_gpu);
> > +
> > int amdgpu_ras_eeprom_process_recods(struct amdgpu_ras_eeprom_control
> > *control,
> > struct eeprom_table_record
> > *records,
> > bool write,
> > --
> > 2.17.1
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