diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c | 1154 |
1 files changed, 1154 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c new file mode 100644 index 000000000000..c4283987bb1e --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c @@ -0,0 +1,1154 @@ +/* + * Copyright 2019 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + */ + +#include "amdgpu_ras_eeprom.h" +#include "amdgpu.h" +#include "amdgpu_ras.h" +#include <linux/bits.h> +#include "atom.h" +#include "amdgpu_eeprom.h" +#include "amdgpu_atomfirmware.h" +#include <linux/debugfs.h> +#include <linux/uaccess.h> + +#include "amdgpu_reset.h" + +#define EEPROM_I2C_MADDR_VEGA20 0x0 +#define EEPROM_I2C_MADDR_ARCTURUS 0x40000 +#define EEPROM_I2C_MADDR_ARCTURUS_D342 0x0 +#define EEPROM_I2C_MADDR_SIENNA_CICHLID 0x0 +#define EEPROM_I2C_MADDR_ALDEBARAN 0x0 + +/* + * The 2 macros bellow represent the actual size in bytes that + * those entities occupy in the EEPROM memory. + * RAS_TABLE_RECORD_SIZE is different than sizeof(eeprom_table_record) which + * uses uint64 to store 6b fields such as retired_page. + */ +#define RAS_TABLE_HEADER_SIZE 20 +#define RAS_TABLE_RECORD_SIZE 24 + +/* Table hdr is 'AMDR' */ +#define RAS_TABLE_HDR_VAL 0x414d4452 +#define RAS_TABLE_VER 0x00010000 + +/* Bad GPU tag ‘BADG’ */ +#define RAS_TABLE_HDR_BAD 0x42414447 + +/* Assume 2-Mbit size EEPROM and take up the whole space. */ +#define RAS_TBL_SIZE_BYTES (256 * 1024) +#define RAS_TABLE_START 0 +#define RAS_HDR_START RAS_TABLE_START +#define RAS_RECORD_START (RAS_HDR_START + RAS_TABLE_HEADER_SIZE) +#define RAS_MAX_RECORD_COUNT ((RAS_TBL_SIZE_BYTES - RAS_TABLE_HEADER_SIZE) \ + / RAS_TABLE_RECORD_SIZE) + +/* Given a zero-based index of an EEPROM RAS record, yields the EEPROM + * offset off of RAS_TABLE_START. That is, this is something you can + * add to control->i2c_address, and then tell I2C layer to read + * from/write to there. _N is the so called absolute index, + * because it starts right after the table header. + */ +#define RAS_INDEX_TO_OFFSET(_C, _N) ((_C)->ras_record_offset + \ + (_N) * RAS_TABLE_RECORD_SIZE) + +#define RAS_OFFSET_TO_INDEX(_C, _O) (((_O) - \ + (_C)->ras_record_offset) / RAS_TABLE_RECORD_SIZE) + +/* Given a 0-based relative record index, 0, 1, 2, ..., etc., off + * of "fri", return the absolute record index off of the end of + * the table header. + */ +#define RAS_RI_TO_AI(_C, _I) (((_I) + (_C)->ras_fri) % \ + (_C)->ras_max_record_count) + +#define RAS_NUM_RECS(_tbl_hdr) (((_tbl_hdr)->tbl_size - \ + RAS_TABLE_HEADER_SIZE) / RAS_TABLE_RECORD_SIZE) + +#define to_amdgpu_device(x) (container_of(x, struct amdgpu_ras, eeprom_control))->adev + +static bool __is_ras_eeprom_supported(struct amdgpu_device *adev) +{ + return adev->asic_type == CHIP_VEGA20 || + adev->asic_type == CHIP_ARCTURUS || + adev->asic_type == CHIP_SIENNA_CICHLID || + adev->asic_type == CHIP_ALDEBARAN; +} + +static bool __get_eeprom_i2c_addr_arct(struct amdgpu_device *adev, + struct amdgpu_ras_eeprom_control *control) +{ + struct atom_context *atom_ctx = adev->mode_info.atom_context; + + if (!control || !atom_ctx) + return false; + + if (strnstr(atom_ctx->vbios_version, + "D342", + sizeof(atom_ctx->vbios_version))) + control->i2c_address = EEPROM_I2C_MADDR_ARCTURUS_D342; + else + control->i2c_address = EEPROM_I2C_MADDR_ARCTURUS; + + return true; +} + +static bool __get_eeprom_i2c_addr(struct amdgpu_device *adev, + struct amdgpu_ras_eeprom_control *control) +{ + u8 i2c_addr; + + if (!control) + return false; + + if (amdgpu_atomfirmware_ras_rom_addr(adev, &i2c_addr)) { + /* The address given by VBIOS is an 8-bit, wire-format + * address, i.e. the most significant byte. + * + * Normalize it to a 19-bit EEPROM address. Remove the + * device type identifier and make it a 7-bit address; + * then make it a 19-bit EEPROM address. See top of + * amdgpu_eeprom.c. + */ + i2c_addr = (i2c_addr & 0x0F) >> 1; + control->i2c_address = ((u32) i2c_addr) << 16; + + return true; + } + + switch (adev->asic_type) { + case CHIP_VEGA20: + control->i2c_address = EEPROM_I2C_MADDR_VEGA20; + break; + + case CHIP_ARCTURUS: + return __get_eeprom_i2c_addr_arct(adev, control); + + case CHIP_SIENNA_CICHLID: + control->i2c_address = EEPROM_I2C_MADDR_SIENNA_CICHLID; + break; + + case CHIP_ALDEBARAN: + control->i2c_address = EEPROM_I2C_MADDR_ALDEBARAN; + break; + + default: + return false; + } + + return true; +} + +static void +__encode_table_header_to_buf(struct amdgpu_ras_eeprom_table_header *hdr, + unsigned char *buf) +{ + u32 *pp = (uint32_t *)buf; + + pp[0] = cpu_to_le32(hdr->header); + pp[1] = cpu_to_le32(hdr->version); + pp[2] = cpu_to_le32(hdr->first_rec_offset); + pp[3] = cpu_to_le32(hdr->tbl_size); + pp[4] = cpu_to_le32(hdr->checksum); +} + +static void +__decode_table_header_from_buf(struct amdgpu_ras_eeprom_table_header *hdr, + unsigned char *buf) +{ + u32 *pp = (uint32_t *)buf; + + hdr->header = le32_to_cpu(pp[0]); + hdr->version = le32_to_cpu(pp[1]); + hdr->first_rec_offset = le32_to_cpu(pp[2]); + hdr->tbl_size = le32_to_cpu(pp[3]); + hdr->checksum = le32_to_cpu(pp[4]); +} + +static int __write_table_header(struct amdgpu_ras_eeprom_control *control) +{ + u8 buf[RAS_TABLE_HEADER_SIZE]; + struct amdgpu_device *adev = to_amdgpu_device(control); + int res; + + memset(buf, 0, sizeof(buf)); + __encode_table_header_to_buf(&control->tbl_hdr, buf); + + /* i2c may be unstable in gpu reset */ + down_read(&adev->reset_domain->sem); + res = amdgpu_eeprom_write(adev->pm.ras_eeprom_i2c_bus, + control->i2c_address + + control->ras_header_offset, + buf, RAS_TABLE_HEADER_SIZE); + up_read(&adev->reset_domain->sem); + + if (res < 0) { + DRM_ERROR("Failed to write EEPROM table header:%d", res); + } else if (res < RAS_TABLE_HEADER_SIZE) { + DRM_ERROR("Short write:%d out of %d\n", + res, RAS_TABLE_HEADER_SIZE); + res = -EIO; + } else { + res = 0; + } + + return res; +} + +static u8 __calc_hdr_byte_sum(const struct amdgpu_ras_eeprom_control *control) +{ + int ii; + u8 *pp, csum; + size_t sz; + + /* Header checksum, skip checksum field in the calculation */ + sz = sizeof(control->tbl_hdr) - sizeof(control->tbl_hdr.checksum); + pp = (u8 *) &control->tbl_hdr; + csum = 0; + for (ii = 0; ii < sz; ii++, pp++) + csum += *pp; + + return csum; +} + +static int amdgpu_ras_eeprom_correct_header_tag( + struct amdgpu_ras_eeprom_control *control, + uint32_t header) +{ + struct amdgpu_ras_eeprom_table_header *hdr = &control->tbl_hdr; + u8 *hh; + int res; + u8 csum; + + csum = -hdr->checksum; + + hh = (void *) &hdr->header; + csum -= (hh[0] + hh[1] + hh[2] + hh[3]); + hh = (void *) &header; + csum += hh[0] + hh[1] + hh[2] + hh[3]; + csum = -csum; + mutex_lock(&control->ras_tbl_mutex); + hdr->header = header; + hdr->checksum = csum; + res = __write_table_header(control); + mutex_unlock(&control->ras_tbl_mutex); + + return res; +} + +/** + * amdgpu_ras_eeprom_reset_table -- Reset the RAS EEPROM table + * @control: pointer to control structure + * + * Reset the contents of the header of the RAS EEPROM table. + * Return 0 on success, -errno on error. + */ +int amdgpu_ras_eeprom_reset_table(struct amdgpu_ras_eeprom_control *control) +{ + struct amdgpu_device *adev = to_amdgpu_device(control); + struct amdgpu_ras_eeprom_table_header *hdr = &control->tbl_hdr; + struct amdgpu_ras *con = amdgpu_ras_get_context(adev); + u8 csum; + int res; + + mutex_lock(&control->ras_tbl_mutex); + + hdr->header = RAS_TABLE_HDR_VAL; + hdr->version = RAS_TABLE_VER; + hdr->first_rec_offset = RAS_RECORD_START; + hdr->tbl_size = RAS_TABLE_HEADER_SIZE; + + csum = __calc_hdr_byte_sum(control); + csum = -csum; + hdr->checksum = csum; + res = __write_table_header(control); + + control->ras_num_recs = 0; + control->ras_fri = 0; + + amdgpu_dpm_send_hbm_bad_pages_num(adev, control->ras_num_recs); + + control->bad_channel_bitmap = 0; + amdgpu_dpm_send_hbm_bad_channel_flag(adev, control->bad_channel_bitmap); + con->update_channel_flag = false; + + amdgpu_ras_debugfs_set_ret_size(control); + + mutex_unlock(&control->ras_tbl_mutex); + + return res; +} + +static void +__encode_table_record_to_buf(struct amdgpu_ras_eeprom_control *control, + struct eeprom_table_record *record, + unsigned char *buf) +{ + __le64 tmp = 0; + int i = 0; + + /* Next are all record fields according to EEPROM page spec in LE foramt */ + buf[i++] = record->err_type; + + buf[i++] = record->bank; + + tmp = cpu_to_le64(record->ts); + memcpy(buf + i, &tmp, 8); + i += 8; + + tmp = cpu_to_le64((record->offset & 0xffffffffffff)); + memcpy(buf + i, &tmp, 6); + i += 6; + + buf[i++] = record->mem_channel; + buf[i++] = record->mcumc_id; + + tmp = cpu_to_le64((record->retired_page & 0xffffffffffff)); + memcpy(buf + i, &tmp, 6); +} + +static void +__decode_table_record_from_buf(struct amdgpu_ras_eeprom_control *control, + struct eeprom_table_record *record, + unsigned char *buf) +{ + __le64 tmp = 0; + int i = 0; + + /* Next are all record fields according to EEPROM page spec in LE foramt */ + record->err_type = buf[i++]; + + record->bank = buf[i++]; + + memcpy(&tmp, buf + i, 8); + record->ts = le64_to_cpu(tmp); + i += 8; + + memcpy(&tmp, buf + i, 6); + record->offset = (le64_to_cpu(tmp) & 0xffffffffffff); + i += 6; + + record->mem_channel = buf[i++]; + record->mcumc_id = buf[i++]; + + memcpy(&tmp, buf + i, 6); + record->retired_page = (le64_to_cpu(tmp) & 0xffffffffffff); +} + +bool amdgpu_ras_eeprom_check_err_threshold(struct amdgpu_device *adev) +{ + struct amdgpu_ras *con = amdgpu_ras_get_context(adev); + + if (!__is_ras_eeprom_supported(adev)) + return false; + + /* skip check eeprom table for VEGA20 Gaming */ + if (!con) + return false; + else + if (!(con->features & BIT(AMDGPU_RAS_BLOCK__UMC))) + return false; + + if (con->eeprom_control.tbl_hdr.header == RAS_TABLE_HDR_BAD) { + dev_warn(adev->dev, "This GPU is in BAD status."); + dev_warn(adev->dev, "Please retire it or set a larger " + "threshold value when reloading driver.\n"); + return true; + } + + return false; +} + +/** + * __amdgpu_ras_eeprom_write -- write indexed from buffer to EEPROM + * @control: pointer to control structure + * @buf: pointer to buffer containing data to write + * @fri: start writing at this index + * @num: number of records to write + * + * The caller must hold the table mutex in @control. + * Return 0 on success, -errno otherwise. + */ +static int __amdgpu_ras_eeprom_write(struct amdgpu_ras_eeprom_control *control, + u8 *buf, const u32 fri, const u32 num) +{ + struct amdgpu_device *adev = to_amdgpu_device(control); + u32 buf_size; + int res; + + /* i2c may be unstable in gpu reset */ + down_read(&adev->reset_domain->sem); + buf_size = num * RAS_TABLE_RECORD_SIZE; + res = amdgpu_eeprom_write(adev->pm.ras_eeprom_i2c_bus, + control->i2c_address + + RAS_INDEX_TO_OFFSET(control, fri), + buf, buf_size); + up_read(&adev->reset_domain->sem); + if (res < 0) { + DRM_ERROR("Writing %d EEPROM table records error:%d", + num, res); + } else if (res < buf_size) { + /* Short write, return error. + */ + DRM_ERROR("Wrote %d records out of %d", + res / RAS_TABLE_RECORD_SIZE, num); + res = -EIO; + } else { + res = 0; + } + + return res; +} + +static int +amdgpu_ras_eeprom_append_table(struct amdgpu_ras_eeprom_control *control, + struct eeprom_table_record *record, + const u32 num) +{ + struct amdgpu_ras *con = amdgpu_ras_get_context(to_amdgpu_device(control)); + u32 a, b, i; + u8 *buf, *pp; + int res; + + buf = kcalloc(num, RAS_TABLE_RECORD_SIZE, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + /* Encode all of them in one go. + */ + pp = buf; + for (i = 0; i < num; i++, pp += RAS_TABLE_RECORD_SIZE) { + __encode_table_record_to_buf(control, &record[i], pp); + + /* update bad channel bitmap */ + if (!(control->bad_channel_bitmap & (1 << record[i].mem_channel))) { + control->bad_channel_bitmap |= 1 << record[i].mem_channel; + con->update_channel_flag = true; + } + } + + /* a, first record index to write into. + * b, last record index to write into. + * a = first index to read (fri) + number of records in the table, + * b = a + @num - 1. + * Let N = control->ras_max_num_record_count, then we have, + * case 0: 0 <= a <= b < N, + * just append @num records starting at a; + * case 1: 0 <= a < N <= b, + * append (N - a) records starting at a, and + * append the remainder, b % N + 1, starting at 0. + * case 2: 0 <= fri < N <= a <= b, then modulo N we get two subcases, + * case 2a: 0 <= a <= b < N + * append num records starting at a; and fix fri if b overwrote it, + * and since a <= b, if b overwrote it then a must've also, + * and if b didn't overwrite it, then a didn't also. + * case 2b: 0 <= b < a < N + * write num records starting at a, which wraps around 0=N + * and overwrite fri unconditionally. Now from case 2a, + * this means that b eclipsed fri to overwrite it and wrap + * around 0 again, i.e. b = 2N+r pre modulo N, so we unconditionally + * set fri = b + 1 (mod N). + * Now, since fri is updated in every case, except the trivial case 0, + * the number of records present in the table after writing, is, + * num_recs - 1 = b - fri (mod N), and we take the positive value, + * by adding an arbitrary multiple of N before taking the modulo N + * as shown below. + */ + a = control->ras_fri + control->ras_num_recs; + b = a + num - 1; + if (b < control->ras_max_record_count) { + res = __amdgpu_ras_eeprom_write(control, buf, a, num); + } else if (a < control->ras_max_record_count) { + u32 g0, g1; + + g0 = control->ras_max_record_count - a; + g1 = b % control->ras_max_record_count + 1; + res = __amdgpu_ras_eeprom_write(control, buf, a, g0); + if (res) + goto Out; + res = __amdgpu_ras_eeprom_write(control, + buf + g0 * RAS_TABLE_RECORD_SIZE, + 0, g1); + if (res) + goto Out; + if (g1 > control->ras_fri) + control->ras_fri = g1 % control->ras_max_record_count; + } else { + a %= control->ras_max_record_count; + b %= control->ras_max_record_count; + + if (a <= b) { + /* Note that, b - a + 1 = num. */ + res = __amdgpu_ras_eeprom_write(control, buf, a, num); + if (res) + goto Out; + if (b >= control->ras_fri) + control->ras_fri = (b + 1) % control->ras_max_record_count; + } else { + u32 g0, g1; + + /* b < a, which means, we write from + * a to the end of the table, and from + * the start of the table to b. + */ + g0 = control->ras_max_record_count - a; + g1 = b + 1; + res = __amdgpu_ras_eeprom_write(control, buf, a, g0); + if (res) + goto Out; + res = __amdgpu_ras_eeprom_write(control, + buf + g0 * RAS_TABLE_RECORD_SIZE, + 0, g1); + if (res) + goto Out; + control->ras_fri = g1 % control->ras_max_record_count; + } + } + control->ras_num_recs = 1 + (control->ras_max_record_count + b + - control->ras_fri) + % control->ras_max_record_count; +Out: + kfree(buf); + return res; +} + +static int +amdgpu_ras_eeprom_update_header(struct amdgpu_ras_eeprom_control *control) +{ + struct amdgpu_device *adev = to_amdgpu_device(control); + struct amdgpu_ras *ras = amdgpu_ras_get_context(adev); + u8 *buf, *pp, csum; + u32 buf_size; + int res; + + /* Modify the header if it exceeds. + */ + if (amdgpu_bad_page_threshold != 0 && + control->ras_num_recs >= ras->bad_page_cnt_threshold) { + dev_warn(adev->dev, + "Saved bad pages %d reaches threshold value %d\n", + control->ras_num_recs, ras->bad_page_cnt_threshold); + control->tbl_hdr.header = RAS_TABLE_HDR_BAD; + } + + control->tbl_hdr.version = RAS_TABLE_VER; + control->tbl_hdr.first_rec_offset = RAS_INDEX_TO_OFFSET(control, control->ras_fri); + control->tbl_hdr.tbl_size = RAS_TABLE_HEADER_SIZE + control->ras_num_recs * RAS_TABLE_RECORD_SIZE; + control->tbl_hdr.checksum = 0; + + buf_size = control->ras_num_recs * RAS_TABLE_RECORD_SIZE; + buf = kcalloc(control->ras_num_recs, RAS_TABLE_RECORD_SIZE, GFP_KERNEL); + if (!buf) { + DRM_ERROR("allocating memory for table of size %d bytes failed\n", + control->tbl_hdr.tbl_size); + res = -ENOMEM; + goto Out; + } + + down_read(&adev->reset_domain->sem); + res = amdgpu_eeprom_read(adev->pm.ras_eeprom_i2c_bus, + control->i2c_address + + control->ras_record_offset, + buf, buf_size); + up_read(&adev->reset_domain->sem); + if (res < 0) { + DRM_ERROR("EEPROM failed reading records:%d\n", + res); + goto Out; + } else if (res < buf_size) { + DRM_ERROR("EEPROM read %d out of %d bytes\n", + res, buf_size); + res = -EIO; + goto Out; + } + + /* Recalc the checksum. + */ + csum = 0; + for (pp = buf; pp < buf + buf_size; pp++) + csum += *pp; + + csum += __calc_hdr_byte_sum(control); + /* avoid sign extension when assigning to "checksum" */ + csum = -csum; + control->tbl_hdr.checksum = csum; + res = __write_table_header(control); +Out: + kfree(buf); + return res; +} + +/** + * amdgpu_ras_eeprom_append -- append records to the EEPROM RAS table + * @control: pointer to control structure + * @record: array of records to append + * @num: number of records in @record array + * + * Append @num records to the table, calculate the checksum and write + * the table back to EEPROM. The maximum number of records that + * can be appended is between 1 and control->ras_max_record_count, + * regardless of how many records are already stored in the table. + * + * Return 0 on success or if EEPROM is not supported, -errno on error. + */ +int amdgpu_ras_eeprom_append(struct amdgpu_ras_eeprom_control *control, + struct eeprom_table_record *record, + const u32 num) +{ + struct amdgpu_device *adev = to_amdgpu_device(control); + int res; + + if (!__is_ras_eeprom_supported(adev)) + return 0; + + if (num == 0) { + DRM_ERROR("will not append 0 records\n"); + return -EINVAL; + } else if (num > control->ras_max_record_count) { + DRM_ERROR("cannot append %d records than the size of table %d\n", + num, control->ras_max_record_count); + return -EINVAL; + } + + mutex_lock(&control->ras_tbl_mutex); + + res = amdgpu_ras_eeprom_append_table(control, record, num); + if (!res) + res = amdgpu_ras_eeprom_update_header(control); + if (!res) + amdgpu_ras_debugfs_set_ret_size(control); + + mutex_unlock(&control->ras_tbl_mutex); + return res; +} + +/** + * __amdgpu_ras_eeprom_read -- read indexed from EEPROM into buffer + * @control: pointer to control structure + * @buf: pointer to buffer to read into + * @fri: first record index, start reading at this index, absolute index + * @num: number of records to read + * + * The caller must hold the table mutex in @control. + * Return 0 on success, -errno otherwise. + */ +static int __amdgpu_ras_eeprom_read(struct amdgpu_ras_eeprom_control *control, + u8 *buf, const u32 fri, const u32 num) +{ + struct amdgpu_device *adev = to_amdgpu_device(control); + u32 buf_size; + int res; + + /* i2c may be unstable in gpu reset */ + down_read(&adev->reset_domain->sem); + buf_size = num * RAS_TABLE_RECORD_SIZE; + res = amdgpu_eeprom_read(adev->pm.ras_eeprom_i2c_bus, + control->i2c_address + + RAS_INDEX_TO_OFFSET(control, fri), + buf, buf_size); + up_read(&adev->reset_domain->sem); + if (res < 0) { + DRM_ERROR("Reading %d EEPROM table records error:%d", + num, res); + } else if (res < buf_size) { + /* Short read, return error. + */ + DRM_ERROR("Read %d records out of %d", + res / RAS_TABLE_RECORD_SIZE, num); + res = -EIO; + } else { + res = 0; + } + + return res; +} + +/** + * amdgpu_ras_eeprom_read -- read EEPROM + * @control: pointer to control structure + * @record: array of records to read into + * @num: number of records in @record + * + * Reads num records from the RAS table in EEPROM and + * writes the data into @record array. + * + * Returns 0 on success, -errno on error. + */ +int amdgpu_ras_eeprom_read(struct amdgpu_ras_eeprom_control *control, + struct eeprom_table_record *record, + const u32 num) +{ + struct amdgpu_device *adev = to_amdgpu_device(control); + struct amdgpu_ras *con = amdgpu_ras_get_context(adev); + int i, res; + u8 *buf, *pp; + u32 g0, g1; + + if (!__is_ras_eeprom_supported(adev)) + return 0; + + if (num == 0) { + DRM_ERROR("will not read 0 records\n"); + return -EINVAL; + } else if (num > control->ras_num_recs) { + DRM_ERROR("too many records to read:%d available:%d\n", + num, control->ras_num_recs); + return -EINVAL; + } + + buf = kcalloc(num, RAS_TABLE_RECORD_SIZE, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + /* Determine how many records to read, from the first record + * index, fri, to the end of the table, and from the beginning + * of the table, such that the total number of records is + * @num, and we handle wrap around when fri > 0 and + * fri + num > RAS_MAX_RECORD_COUNT. + * + * First we compute the index of the last element + * which would be fetched from each region, + * g0 is in [fri, fri + num - 1], and + * g1 is in [0, RAS_MAX_RECORD_COUNT - 1]. + * Then, if g0 < RAS_MAX_RECORD_COUNT, the index of + * the last element to fetch, we set g0 to _the number_ + * of elements to fetch, @num, since we know that the last + * indexed to be fetched does not exceed the table. + * + * If, however, g0 >= RAS_MAX_RECORD_COUNT, then + * we set g0 to the number of elements to read + * until the end of the table, and g1 to the number of + * elements to read from the beginning of the table. + */ + g0 = control->ras_fri + num - 1; + g1 = g0 % control->ras_max_record_count; + if (g0 < control->ras_max_record_count) { + g0 = num; + g1 = 0; + } else { + g0 = control->ras_max_record_count - control->ras_fri; + g1 += 1; + } + + mutex_lock(&control->ras_tbl_mutex); + res = __amdgpu_ras_eeprom_read(control, buf, control->ras_fri, g0); + if (res) + goto Out; + if (g1) { + res = __amdgpu_ras_eeprom_read(control, + buf + g0 * RAS_TABLE_RECORD_SIZE, + 0, g1); + if (res) + goto Out; + } + + res = 0; + + /* Read up everything? Then transform. + */ + pp = buf; + for (i = 0; i < num; i++, pp += RAS_TABLE_RECORD_SIZE) { + __decode_table_record_from_buf(control, &record[i], pp); + + /* update bad channel bitmap */ + if (!(control->bad_channel_bitmap & (1 << record[i].mem_channel))) { + control->bad_channel_bitmap |= 1 << record[i].mem_channel; + con->update_channel_flag = true; + } + } +Out: + kfree(buf); + mutex_unlock(&control->ras_tbl_mutex); + + return res; +} + +uint32_t amdgpu_ras_eeprom_max_record_count(void) +{ + return RAS_MAX_RECORD_COUNT; +} + +static ssize_t +amdgpu_ras_debugfs_eeprom_size_read(struct file *f, char __user *buf, + size_t size, loff_t *pos) +{ + struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private; + struct amdgpu_ras *ras = amdgpu_ras_get_context(adev); + struct amdgpu_ras_eeprom_control *control = ras ? &ras->eeprom_control : NULL; + u8 data[50]; + int res; + + if (!size) + return size; + + if (!ras || !control) { + res = snprintf(data, sizeof(data), "Not supported\n"); + } else { + res = snprintf(data, sizeof(data), "%d bytes or %d records\n", + RAS_TBL_SIZE_BYTES, control->ras_max_record_count); + } + + if (*pos >= res) + return 0; + + res -= *pos; + res = min_t(size_t, res, size); + + if (copy_to_user(buf, &data[*pos], res)) + return -EFAULT; + + *pos += res; + + return res; +} + +const struct file_operations amdgpu_ras_debugfs_eeprom_size_ops = { + .owner = THIS_MODULE, + .read = amdgpu_ras_debugfs_eeprom_size_read, + .write = NULL, + .llseek = default_llseek, +}; + +static const char *tbl_hdr_str = " Signature Version FirstOffs Size Checksum\n"; +static const char *tbl_hdr_fmt = "0x%08X 0x%08X 0x%08X 0x%08X 0x%08X\n"; +#define tbl_hdr_fmt_size (5 * (2+8) + 4 + 1) +static const char *rec_hdr_str = "Index Offset ErrType Bank/CU TimeStamp Offs/Addr MemChl MCUMCID RetiredPage\n"; +static const char *rec_hdr_fmt = "%5d 0x%05X %7s 0x%02X 0x%016llX 0x%012llX 0x%02X 0x%02X 0x%012llX\n"; +#define rec_hdr_fmt_size (5 + 1 + 7 + 1 + 7 + 1 + 7 + 1 + 18 + 1 + 14 + 1 + 6 + 1 + 7 + 1 + 14 + 1) + +static const char *record_err_type_str[AMDGPU_RAS_EEPROM_ERR_COUNT] = { + "ignore", + "re", + "ue", +}; + +static loff_t amdgpu_ras_debugfs_table_size(struct amdgpu_ras_eeprom_control *control) +{ + return strlen(tbl_hdr_str) + tbl_hdr_fmt_size + + strlen(rec_hdr_str) + rec_hdr_fmt_size * control->ras_num_recs; +} + +void amdgpu_ras_debugfs_set_ret_size(struct amdgpu_ras_eeprom_control *control) +{ + struct amdgpu_ras *ras = container_of(control, struct amdgpu_ras, + eeprom_control); + struct dentry *de = ras->de_ras_eeprom_table; + + if (de) + d_inode(de)->i_size = amdgpu_ras_debugfs_table_size(control); +} + +static ssize_t amdgpu_ras_debugfs_table_read(struct file *f, char __user *buf, + size_t size, loff_t *pos) +{ + struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private; + struct amdgpu_ras *ras = amdgpu_ras_get_context(adev); + struct amdgpu_ras_eeprom_control *control = &ras->eeprom_control; + const size_t orig_size = size; + int res = -EFAULT; + size_t data_len; + + mutex_lock(&control->ras_tbl_mutex); + + /* We want *pos - data_len > 0, which means there's + * bytes to be printed from data. + */ + data_len = strlen(tbl_hdr_str); + if (*pos < data_len) { + data_len -= *pos; + data_len = min_t(size_t, data_len, size); + if (copy_to_user(buf, &tbl_hdr_str[*pos], data_len)) + goto Out; + buf += data_len; + size -= data_len; + *pos += data_len; + } + + data_len = strlen(tbl_hdr_str) + tbl_hdr_fmt_size; + if (*pos < data_len && size > 0) { + u8 data[tbl_hdr_fmt_size + 1]; + loff_t lpos; + + snprintf(data, sizeof(data), tbl_hdr_fmt, + control->tbl_hdr.header, + control->tbl_hdr.version, + control->tbl_hdr.first_rec_offset, + control->tbl_hdr.tbl_size, + control->tbl_hdr.checksum); + + data_len -= *pos; + data_len = min_t(size_t, data_len, size); + lpos = *pos - strlen(tbl_hdr_str); + if (copy_to_user(buf, &data[lpos], data_len)) + goto Out; + buf += data_len; + size -= data_len; + *pos += data_len; + } + + data_len = strlen(tbl_hdr_str) + tbl_hdr_fmt_size + strlen(rec_hdr_str); + if (*pos < data_len && size > 0) { + loff_t lpos; + + data_len -= *pos; + data_len = min_t(size_t, data_len, size); + lpos = *pos - strlen(tbl_hdr_str) - tbl_hdr_fmt_size; + if (copy_to_user(buf, &rec_hdr_str[lpos], data_len)) + goto Out; + buf += data_len; + size -= data_len; + *pos += data_len; + } + + data_len = amdgpu_ras_debugfs_table_size(control); + if (*pos < data_len && size > 0) { + u8 dare[RAS_TABLE_RECORD_SIZE]; + u8 data[rec_hdr_fmt_size + 1]; + struct eeprom_table_record record; + int s, r; + + /* Find the starting record index + */ + s = *pos - strlen(tbl_hdr_str) - tbl_hdr_fmt_size - + strlen(rec_hdr_str); + s = s / rec_hdr_fmt_size; + r = *pos - strlen(tbl_hdr_str) - tbl_hdr_fmt_size - + strlen(rec_hdr_str); + r = r % rec_hdr_fmt_size; + + for ( ; size > 0 && s < control->ras_num_recs; s++) { + u32 ai = RAS_RI_TO_AI(control, s); + /* Read a single record + */ + res = __amdgpu_ras_eeprom_read(control, dare, ai, 1); + if (res) + goto Out; + __decode_table_record_from_buf(control, &record, dare); + snprintf(data, sizeof(data), rec_hdr_fmt, + s, + RAS_INDEX_TO_OFFSET(control, ai), + record_err_type_str[record.err_type], + record.bank, + record.ts, + record.offset, + record.mem_channel, + record.mcumc_id, + record.retired_page); + + data_len = min_t(size_t, rec_hdr_fmt_size - r, size); + if (copy_to_user(buf, &data[r], data_len)) { + res = -EFAULT; + goto Out; + } + buf += data_len; + size -= data_len; + *pos += data_len; + r = 0; + } + } + res = 0; +Out: + mutex_unlock(&control->ras_tbl_mutex); + return res < 0 ? res : orig_size - size; +} + +static ssize_t +amdgpu_ras_debugfs_eeprom_table_read(struct file *f, char __user *buf, + size_t size, loff_t *pos) +{ + struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private; + struct amdgpu_ras *ras = amdgpu_ras_get_context(adev); + struct amdgpu_ras_eeprom_control *control = ras ? &ras->eeprom_control : NULL; + u8 data[81]; + int res; + + if (!size) + return size; + + if (!ras || !control) { + res = snprintf(data, sizeof(data), "Not supported\n"); + if (*pos >= res) + return 0; + + res -= *pos; + res = min_t(size_t, res, size); + + if (copy_to_user(buf, &data[*pos], res)) + return -EFAULT; + + *pos += res; + + return res; + } else { + return amdgpu_ras_debugfs_table_read(f, buf, size, pos); + } +} + +const struct file_operations amdgpu_ras_debugfs_eeprom_table_ops = { + .owner = THIS_MODULE, + .read = amdgpu_ras_debugfs_eeprom_table_read, + .write = NULL, + .llseek = default_llseek, +}; + +/** + * __verify_ras_table_checksum -- verify the RAS EEPROM table checksum + * @control: pointer to control structure + * + * Check the checksum of the stored in EEPROM RAS table. + * + * Return 0 if the checksum is correct, + * positive if it is not correct, and + * -errno on I/O error. + */ +static int __verify_ras_table_checksum(struct amdgpu_ras_eeprom_control *control) +{ + struct amdgpu_device *adev = to_amdgpu_device(control); + int buf_size, res; + u8 csum, *buf, *pp; + + buf_size = RAS_TABLE_HEADER_SIZE + + control->ras_num_recs * RAS_TABLE_RECORD_SIZE; + buf = kzalloc(buf_size, GFP_KERNEL); + if (!buf) { + DRM_ERROR("Out of memory checking RAS table checksum.\n"); + return -ENOMEM; + } + + res = amdgpu_eeprom_read(adev->pm.ras_eeprom_i2c_bus, + control->i2c_address + + control->ras_header_offset, + buf, buf_size); + if (res < buf_size) { + DRM_ERROR("Partial read for checksum, res:%d\n", res); + /* On partial reads, return -EIO. + */ + if (res >= 0) + res = -EIO; + goto Out; + } + + csum = 0; + for (pp = buf; pp < buf + buf_size; pp++) + csum += *pp; +Out: + kfree(buf); + return res < 0 ? res : csum; +} + +int amdgpu_ras_eeprom_init(struct amdgpu_ras_eeprom_control *control, + bool *exceed_err_limit) +{ + struct amdgpu_device *adev = to_amdgpu_device(control); + unsigned char buf[RAS_TABLE_HEADER_SIZE] = { 0 }; + struct amdgpu_ras_eeprom_table_header *hdr = &control->tbl_hdr; + struct amdgpu_ras *ras = amdgpu_ras_get_context(adev); + int res; + + *exceed_err_limit = false; + + if (!__is_ras_eeprom_supported(adev)) + return 0; + + /* Verify i2c adapter is initialized */ + if (!adev->pm.ras_eeprom_i2c_bus || !adev->pm.ras_eeprom_i2c_bus->algo) + return -ENOENT; + + if (!__get_eeprom_i2c_addr(adev, control)) + return -EINVAL; + + control->ras_header_offset = RAS_HDR_START; + control->ras_record_offset = RAS_RECORD_START; + control->ras_max_record_count = RAS_MAX_RECORD_COUNT; + mutex_init(&control->ras_tbl_mutex); + + /* Read the table header from EEPROM address */ + res = amdgpu_eeprom_read(adev->pm.ras_eeprom_i2c_bus, + control->i2c_address + control->ras_header_offset, + buf, RAS_TABLE_HEADER_SIZE); + if (res < RAS_TABLE_HEADER_SIZE) { + DRM_ERROR("Failed to read EEPROM table header, res:%d", res); + return res >= 0 ? -EIO : res; + } + + __decode_table_header_from_buf(hdr, buf); + + control->ras_num_recs = RAS_NUM_RECS(hdr); + control->ras_fri = RAS_OFFSET_TO_INDEX(control, hdr->first_rec_offset); + + if (hdr->header == RAS_TABLE_HDR_VAL) { + DRM_DEBUG_DRIVER("Found existing EEPROM table with %d records", + control->ras_num_recs); + res = __verify_ras_table_checksum(control); + if (res) + DRM_ERROR("RAS table incorrect checksum or error:%d\n", + res); + + /* Warn if we are at 90% of the threshold or above + */ + if (10 * control->ras_num_recs >= 9 * ras->bad_page_cnt_threshold) + dev_warn(adev->dev, "RAS records:%u exceeds 90%% of threshold:%d", + control->ras_num_recs, + ras->bad_page_cnt_threshold); + } else if (hdr->header == RAS_TABLE_HDR_BAD && + amdgpu_bad_page_threshold != 0) { + res = __verify_ras_table_checksum(control); + if (res) + DRM_ERROR("RAS Table incorrect checksum or error:%d\n", + res); + if (ras->bad_page_cnt_threshold > control->ras_num_recs) { + /* This means that, the threshold was increased since + * the last time the system was booted, and now, + * ras->bad_page_cnt_threshold - control->num_recs > 0, + * so that at least one more record can be saved, + * before the page count threshold is reached. + */ + dev_info(adev->dev, + "records:%d threshold:%d, resetting " + "RAS table header signature", + control->ras_num_recs, + ras->bad_page_cnt_threshold); + res = amdgpu_ras_eeprom_correct_header_tag(control, + RAS_TABLE_HDR_VAL); + } else { + dev_err(adev->dev, "RAS records:%d exceed threshold:%d", + control->ras_num_recs, ras->bad_page_cnt_threshold); + if (amdgpu_bad_page_threshold == -2) { + dev_warn(adev->dev, "GPU will be initialized due to bad_page_threshold = -2."); + res = 0; + } else { + *exceed_err_limit = true; + dev_err(adev->dev, + "RAS records:%d exceed threshold:%d, " + "GPU will not be initialized. Replace this GPU or increase the threshold", + control->ras_num_recs, ras->bad_page_cnt_threshold); + } + } + } else { + DRM_INFO("Creating a new EEPROM table"); + + res = amdgpu_ras_eeprom_reset_table(control); + } + + return res < 0 ? res : 0; +} |