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Mon, 27 Sep 2021 15:59:32 +0000 (GMT) From: Eddie James To: linux-fsi@lists.ozlabs.org Subject: [PATCH v3 1/4] fsi: occ: Use a large buffer for responses Date: Mon, 27 Sep 2021 10:59:22 -0500 Message-Id: <20210927155925.15485-2-eajames@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210927155925.15485-1-eajames@linux.ibm.com> References: <20210927155925.15485-1-eajames@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: i_g1kRRUeyY4YG1P-LKIq8vGosK7Z4Lx X-Proofpoint-ORIG-GUID: i_g1kRRUeyY4YG1P-LKIq8vGosK7Z4Lx X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.790,Hydra:6.0.391,FMLib:17.0.607.475 definitions=2021-09-27_06,2021-09-24_02,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 priorityscore=1501 spamscore=0 suspectscore=0 clxscore=1015 mlxscore=0 bulkscore=0 lowpriorityscore=0 adultscore=0 impostorscore=0 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2109230001 definitions=main-2109270106 X-BeenThere: linux-fsi@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-hwmon@vger.kernel.org, jdelvare@suse.com, alistair@popple.id.au, linux-kernel@vger.kernel.org Errors-To: linux-fsi-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "linux-fsi" Allocate a large buffer for each OCC to handle response data. This removes memory allocation during an operation, and also allows for the maximum amount of SBE FFDC. Signed-off-by: Eddie James --- drivers/fsi/fsi-occ.c | 109 ++++++++++++++++------------------------ include/linux/fsi-occ.h | 2 + 2 files changed, 45 insertions(+), 66 deletions(-) diff --git a/drivers/fsi/fsi-occ.c b/drivers/fsi/fsi-occ.c index b0c9322078a1..ace3ec7767e5 100644 --- a/drivers/fsi/fsi-occ.c +++ b/drivers/fsi/fsi-occ.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -42,13 +43,6 @@ #define OCC_P10_SRAM_MODE 0x58 /* Normal mode, OCB channel 2 */ -/* - * Assume we don't have much FFDC, if we do we'll overflow and - * fail the command. This needs to be big enough for simple - * commands as well. - */ -#define OCC_SBE_STATUS_WORDS 32 - #define OCC_TIMEOUT_MS 1000 #define OCC_CMD_IN_PRG_WAIT_MS 50 @@ -60,6 +54,7 @@ struct occ { char name[32]; int idx; u8 sequence_number; + void *buffer; enum versions version; struct miscdevice mdev; struct mutex occ_lock; @@ -250,8 +245,10 @@ static int occ_verify_checksum(struct occ *occ, struct occ_response *resp, static int occ_getsram(struct occ *occ, u32 offset, void *data, ssize_t len) { u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */ - size_t cmd_len, resp_len, resp_data_len; - __be32 *resp, cmd[6]; + size_t cmd_len, resp_data_len; + size_t resp_len = OCC_MAX_RESP_WORDS; + __be32 *resp = occ->buffer; + __be32 cmd[6]; int idx = 0, rc; /* @@ -278,19 +275,19 @@ static int occ_getsram(struct occ *occ, u32 offset, void *data, ssize_t len) cmd[1] = cpu_to_be32(SBEFIFO_CMD_GET_OCC_SRAM); cmd[4 + idx] = cpu_to_be32(data_len); - resp_len = (data_len >> 2) + OCC_SBE_STATUS_WORDS; - resp = kzalloc(resp_len << 2, GFP_KERNEL); - if (!resp) - return -ENOMEM; - rc = sbefifo_submit(occ->sbefifo, cmd, cmd_len, resp, &resp_len); if (rc) - goto free; + return rc; rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_GET_OCC_SRAM, resp, resp_len, &resp_len); - if (rc) - goto free; + if (rc > 0) { + dev_err(occ->dev, "SRAM read returned failure status: %08x\n", + rc); + return -EBADMSG; + } else if (rc) { + return rc; + } resp_data_len = be32_to_cpu(resp[resp_len - 1]); if (resp_data_len != data_len) { @@ -301,39 +298,21 @@ static int occ_getsram(struct occ *occ, u32 offset, void *data, ssize_t len) memcpy(data, resp, len); } -free: - /* Convert positive SBEI status */ - if (rc > 0) { - dev_err(occ->dev, "SRAM read returned failure status: %08x\n", - rc); - rc = -EBADMSG; - } - - kfree(resp); return rc; } static int occ_putsram(struct occ *occ, const void *data, ssize_t len, u8 seq_no, u16 checksum) { - size_t cmd_len, buf_len, resp_len, resp_data_len; u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */ - __be32 *buf; + size_t cmd_len, resp_data_len; + size_t resp_len = OCC_MAX_RESP_WORDS; + __be32 *buf = occ->buffer; u8 *byte_buf; int idx = 0, rc; cmd_len = (occ->version == occ_p10) ? 6 : 5; - - /* - * We use the same buffer for command and response, make - * sure it's big enough - */ - resp_len = OCC_SBE_STATUS_WORDS; cmd_len += data_len >> 2; - buf_len = max(cmd_len, resp_len); - buf = kzalloc(buf_len << 2, GFP_KERNEL); - if (!buf) - return -ENOMEM; /* * Magic sequence to do SBE putsram command. SBE will transfer @@ -384,12 +363,17 @@ static int occ_putsram(struct occ *occ, const void *data, ssize_t len, rc = sbefifo_submit(occ->sbefifo, buf, cmd_len, buf, &resp_len); if (rc) - goto free; + return rc; rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM, buf, resp_len, &resp_len); - if (rc) - goto free; + if (rc > 0) { + dev_err(occ->dev, "SRAM write returned failure status: %08x\n", + rc); + return -EBADMSG; + } else if (rc) { + return rc; + } if (resp_len != 1) { dev_err(occ->dev, "SRAM write response length invalid: %zd\n", @@ -405,27 +389,16 @@ static int occ_putsram(struct occ *occ, const void *data, ssize_t len, } } -free: - /* Convert positive SBEI status */ - if (rc > 0) { - dev_err(occ->dev, "SRAM write returned failure status: %08x\n", - rc); - rc = -EBADMSG; - } - - kfree(buf); return rc; } static int occ_trigger_attn(struct occ *occ) { - __be32 buf[OCC_SBE_STATUS_WORDS]; - size_t cmd_len, resp_len, resp_data_len; + __be32 *buf = occ->buffer; + size_t cmd_len, resp_data_len; + size_t resp_len = OCC_MAX_RESP_WORDS; int idx = 0, rc; - BUILD_BUG_ON(OCC_SBE_STATUS_WORDS < 8); - resp_len = OCC_SBE_STATUS_WORDS; - switch (occ->version) { default: case occ_p9: @@ -450,12 +423,17 @@ static int occ_trigger_attn(struct occ *occ) rc = sbefifo_submit(occ->sbefifo, buf, cmd_len, buf, &resp_len); if (rc) - goto error; + return rc; rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM, buf, resp_len, &resp_len); - if (rc) - goto error; + if (rc > 0) { + dev_err(occ->dev, "SRAM attn returned failure status: %08x\n", + rc); + return -EBADMSG; + } else if (rc) { + return rc; + } if (resp_len != 1) { dev_err(occ->dev, "SRAM attn response length invalid: %zd\n", @@ -471,14 +449,6 @@ static int occ_trigger_attn(struct occ *occ) } } - error: - /* Convert positive SBEI status */ - if (rc > 0) { - dev_err(occ->dev, "SRAM attn returned failure status: %08x\n", - rc); - rc = -EBADMSG; - } - return rc; } @@ -635,6 +605,10 @@ static int occ_probe(struct platform_device *pdev) if (!occ) return -ENOMEM; + occ->buffer = kvmalloc(OCC_MAX_RESP_WORDS * 4, GFP_KERNEL); + if (!occ->buffer) + return -ENOMEM; + occ->version = (enum versions)md; occ->dev = dev; occ->sbefifo = dev->parent; @@ -670,6 +644,7 @@ static int occ_probe(struct platform_device *pdev) if (rc) { dev_err(dev, "failed to register miscdevice: %d\n", rc); ida_simple_remove(&occ_ida, occ->idx); + kvfree(occ->buffer); return rc; } @@ -685,6 +660,8 @@ static int occ_remove(struct platform_device *pdev) { struct occ *occ = platform_get_drvdata(pdev); + kvfree(occ->buffer); + misc_deregister(&occ->mdev); device_for_each_child(&pdev->dev, NULL, occ_unregister_child); diff --git a/include/linux/fsi-occ.h b/include/linux/fsi-occ.h index d4cdc2aa6e33..7ee3dbd7f4b3 100644 --- a/include/linux/fsi-occ.h +++ b/include/linux/fsi-occ.h @@ -19,6 +19,8 @@ struct device; #define OCC_RESP_CRIT_OCB 0xE3 #define OCC_RESP_CRIT_HW 0xE4 +#define OCC_MAX_RESP_WORDS 2048 + int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, void *response, size_t *resp_len); 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Mon, 27 Sep 2021 15:59:34 +0000 (GMT) From: Eddie James To: linux-fsi@lists.ozlabs.org Subject: [PATCH v3 2/4] fsi: occ: Store the SBEFIFO FFDC in the user response buffer Date: Mon, 27 Sep 2021 10:59:23 -0500 Message-Id: <20210927155925.15485-3-eajames@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210927155925.15485-1-eajames@linux.ibm.com> References: <20210927155925.15485-1-eajames@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: G9NF2DeaPsLZXU7g__48zdJ_iudI-XDe X-Proofpoint-ORIG-GUID: G9NF2DeaPsLZXU7g__48zdJ_iudI-XDe X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.790,Hydra:6.0.391,FMLib:17.0.607.475 definitions=2021-09-27_06,2021-09-24_02,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 impostorscore=0 suspectscore=0 spamscore=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 bulkscore=0 phishscore=0 mlxscore=0 adultscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2109230001 definitions=main-2109270106 X-BeenThere: linux-fsi@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-hwmon@vger.kernel.org, jdelvare@suse.com, alistair@popple.id.au, linux-kernel@vger.kernel.org Errors-To: linux-fsi-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "linux-fsi" If the SBEFIFO response indicates an error, store the response in the user buffer and return an error. Previously, the user had no way of obtaining the SBEFIFO FFDC. Signed-off-by: Eddie James --- Changes since v1: - Don't store any magic value; only return non-zero resp_len in the error case if there is FFDC drivers/fsi/fsi-occ.c | 66 ++++++++++++++++++++++++++++++------------- 1 file changed, 47 insertions(+), 19 deletions(-) diff --git a/drivers/fsi/fsi-occ.c b/drivers/fsi/fsi-occ.c index ace3ec7767e5..1d5f6fdc2a34 100644 --- a/drivers/fsi/fsi-occ.c +++ b/drivers/fsi/fsi-occ.c @@ -55,6 +55,9 @@ struct occ { int idx; u8 sequence_number; void *buffer; + void *client_buffer; + size_t client_buffer_size; + size_t client_response_size; enum versions version; struct miscdevice mdev; struct mutex occ_lock; @@ -217,6 +220,20 @@ static const struct file_operations occ_fops = { .release = occ_release, }; +static void occ_save_ffdc(struct occ *occ, __be32 *resp, size_t parsed_len, + size_t resp_len) +{ + size_t dh = resp_len - parsed_len; + size_t ffdc_len = (dh - 1) * 4; + __be32 *ffdc = &resp[resp_len - dh]; + + if (ffdc_len > occ->client_buffer_size) + ffdc_len = occ->client_buffer_size; + + memcpy(occ->client_buffer, ffdc, ffdc_len); + occ->client_response_size = ffdc_len; +} + static int occ_verify_checksum(struct occ *occ, struct occ_response *resp, u16 data_length) { @@ -245,7 +262,7 @@ static int occ_verify_checksum(struct occ *occ, struct occ_response *resp, static int occ_getsram(struct occ *occ, u32 offset, void *data, ssize_t len) { u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */ - size_t cmd_len, resp_data_len; + size_t cmd_len, parsed_len, resp_data_len; size_t resp_len = OCC_MAX_RESP_WORDS; __be32 *resp = occ->buffer; __be32 cmd[6]; @@ -280,16 +297,17 @@ static int occ_getsram(struct occ *occ, u32 offset, void *data, ssize_t len) return rc; rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_GET_OCC_SRAM, - resp, resp_len, &resp_len); + resp, resp_len, &parsed_len); if (rc > 0) { dev_err(occ->dev, "SRAM read returned failure status: %08x\n", rc); - return -EBADMSG; + occ_save_ffdc(occ, resp, parsed_len, resp_len); + return -ECOMM; } else if (rc) { return rc; } - resp_data_len = be32_to_cpu(resp[resp_len - 1]); + resp_data_len = be32_to_cpu(resp[parsed_len - 1]); if (resp_data_len != data_len) { dev_err(occ->dev, "SRAM read expected %d bytes got %zd\n", data_len, resp_data_len); @@ -305,7 +323,7 @@ static int occ_putsram(struct occ *occ, const void *data, ssize_t len, u8 seq_no, u16 checksum) { u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */ - size_t cmd_len, resp_data_len; + size_t cmd_len, parsed_len, resp_data_len; size_t resp_len = OCC_MAX_RESP_WORDS; __be32 *buf = occ->buffer; u8 *byte_buf; @@ -366,18 +384,19 @@ static int occ_putsram(struct occ *occ, const void *data, ssize_t len, return rc; rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM, - buf, resp_len, &resp_len); + buf, resp_len, &parsed_len); if (rc > 0) { dev_err(occ->dev, "SRAM write returned failure status: %08x\n", rc); - return -EBADMSG; + occ_save_ffdc(occ, buf, parsed_len, resp_len); + return -ECOMM; } else if (rc) { return rc; } - if (resp_len != 1) { + if (parsed_len != 1) { dev_err(occ->dev, "SRAM write response length invalid: %zd\n", - resp_len); + parsed_len); rc = -EBADMSG; } else { resp_data_len = be32_to_cpu(buf[0]); @@ -395,7 +414,7 @@ static int occ_putsram(struct occ *occ, const void *data, ssize_t len, static int occ_trigger_attn(struct occ *occ) { __be32 *buf = occ->buffer; - size_t cmd_len, resp_data_len; + size_t cmd_len, parsed_len, resp_data_len; size_t resp_len = OCC_MAX_RESP_WORDS; int idx = 0, rc; @@ -426,18 +445,19 @@ static int occ_trigger_attn(struct occ *occ) return rc; rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM, - buf, resp_len, &resp_len); + buf, resp_len, &parsed_len); if (rc > 0) { dev_err(occ->dev, "SRAM attn returned failure status: %08x\n", rc); - return -EBADMSG; + occ_save_ffdc(occ, buf, parsed_len, resp_len); + return -ECOMM; } else if (rc) { return rc; } - if (resp_len != 1) { + if (parsed_len != 1) { dev_err(occ->dev, "SRAM attn response length invalid: %zd\n", - resp_len); + parsed_len); rc = -EBADMSG; } else { resp_data_len = be32_to_cpu(buf[0]); @@ -460,6 +480,7 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, msecs_to_jiffies(OCC_CMD_IN_PRG_WAIT_MS); struct occ *occ = dev_get_drvdata(dev); struct occ_response *resp = response; + size_t user_resp_len = *resp_len; u8 seq_no; u16 checksum = 0; u16 resp_data_length; @@ -468,11 +489,13 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, int rc; size_t i; + *resp_len = 0; + if (!occ) return -ENODEV; - if (*resp_len < 7) { - dev_dbg(dev, "Bad resplen %zd\n", *resp_len); + if (user_resp_len < 7) { + dev_dbg(dev, "Bad resplen %zd\n", user_resp_len); return -EINVAL; } @@ -482,6 +505,10 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, mutex_lock(&occ->occ_lock); + occ->client_buffer = response; + occ->client_buffer_size = user_resp_len; + occ->client_response_size = 0; + /* * Get a sequence number and update the counter. Avoid a sequence * number of 0 which would pass the response check below even if the @@ -532,7 +559,7 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, resp_data_length = get_unaligned_be16(&resp->data_length); /* Message size is data length + 5 bytes header + 2 bytes checksum */ - if ((resp_data_length + 7) > *resp_len) { + if ((resp_data_length + 7) > user_resp_len) { rc = -EMSGSIZE; goto done; } @@ -548,7 +575,7 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, goto done; } - *resp_len = resp_data_length + 7; + occ->client_response_size = resp_data_length + 7; { DEFINE_DYNAMIC_DEBUG_METADATA(ddm_occ_rsp, @@ -560,7 +587,7 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, DYNAMIC_DEBUG_BRANCH(ddm_occ_rsp)) { char prefix[64]; size_t l = DYNAMIC_DEBUG_BRANCH(ddm_occ_full_rsp) ? - *resp_len : 16; + occ->client_response_size : 16; snprintf(prefix, sizeof(prefix), "%s %s: rsp ", dev_driver_string(occ->dev), @@ -573,6 +600,7 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, rc = occ_verify_checksum(occ, resp, resp_data_length); 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Mon, 27 Sep 2021 15:59:35 +0000 (GMT) From: Eddie James To: linux-fsi@lists.ozlabs.org Subject: [PATCH v3 3/4] docs: ABI: testing: Document the OCC hwmon FFDC binary interface Date: Mon, 27 Sep 2021 10:59:24 -0500 Message-Id: <20210927155925.15485-4-eajames@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210927155925.15485-1-eajames@linux.ibm.com> References: <20210927155925.15485-1-eajames@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: ZbA8UBDt6cVQL7MpmzaHB9e-Jt8ETDYH X-Proofpoint-ORIG-GUID: ZbA8UBDt6cVQL7MpmzaHB9e-Jt8ETDYH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.790,Hydra:6.0.391,FMLib:17.0.607.475 definitions=2021-09-27_06,2021-09-24_02,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 priorityscore=1501 spamscore=0 suspectscore=0 clxscore=1015 mlxscore=0 bulkscore=0 lowpriorityscore=0 adultscore=0 impostorscore=0 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2109230001 definitions=main-2109270106 X-BeenThere: linux-fsi@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-hwmon@vger.kernel.org, jdelvare@suse.com, alistair@popple.id.au, linux-kernel@vger.kernel.org Errors-To: linux-fsi-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "linux-fsi" Add documentation for the new binary sysfs that will dump the SBEFIFO FFDC. Signed-off-by: Eddie James --- .../testing/sysfs-bus-platform-devices-occ-hwmon | 13 +++++++++++++ 1 file changed, 13 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-platform-devices-occ-hwmon diff --git a/Documentation/ABI/testing/sysfs-bus-platform-devices-occ-hwmon b/Documentation/ABI/testing/sysfs-bus-platform-devices-occ-hwmon new file mode 100644 index 000000000000..b24d7ab0278f --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-platform-devices-occ-hwmon @@ -0,0 +1,13 @@ +What: /sys/bus/platform/devices/occ-hwmon.X/ffdc +KernelVersion: 5.15 +Contact: eajames@linux.ibm.com +Description: + Contains the First Failure Data Capture from the SBEFIFO + hardware, if there is any from a previous transfer. Otherwise, + the file is empty. The data is cleared when it's been + completely read by a user. As the name suggests, only the data + from the first error is saved, until it's cleared upon read. The OCC hwmon driver, running on + a Baseboard Management Controller (BMC), communicates with + POWER9 and up processors over the Self-Boot Engine (SBE) FIFO. + In many error conditions, the SBEFIFO will return error data + indicating the type of error and system state, etc. From patchwork Mon Sep 27 15:59:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eddie James X-Patchwork-Id: 1533450 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=VLNaGfE7; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=linux-fsi-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; 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Mon, 27 Sep 2021 15:59:37 +0000 (GMT) From: Eddie James To: linux-fsi@lists.ozlabs.org Subject: [PATCH v3 4/4] hwmon: (occ) Provide the SBEFIFO FFDC in binary sysfs Date: Mon, 27 Sep 2021 10:59:25 -0500 Message-Id: <20210927155925.15485-5-eajames@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210927155925.15485-1-eajames@linux.ibm.com> References: <20210927155925.15485-1-eajames@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 0tWEvEv0Lf-CYPhx8PUmE82dMO4gLJc6 X-Proofpoint-ORIG-GUID: 0tWEvEv0Lf-CYPhx8PUmE82dMO4gLJc6 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.790,Hydra:6.0.391,FMLib:17.0.607.475 definitions=2021-09-27_06,2021-09-24_02,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 priorityscore=1501 spamscore=0 suspectscore=0 clxscore=1015 mlxscore=0 bulkscore=0 lowpriorityscore=0 adultscore=0 impostorscore=0 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2109230001 definitions=main-2109270106 X-BeenThere: linux-fsi@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-hwmon@vger.kernel.org, jdelvare@suse.com, alistair@popple.id.au, linux-kernel@vger.kernel.org Errors-To: linux-fsi-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "linux-fsi" Save any FFDC provided by the OCC driver, and provide it to userspace through a binary sysfs entry. Notify userspace pollers when there is an error too. Signed-off-by: Eddie James Reviewed-by: Guenter Roeck --- Changes since v1: - Remove "collected" error state in favor of a boolean - Clear the error flag once the FFDC has been completely read once - Only store FFDC if there is no FFDC waiting to be retrieved drivers/hwmon/occ/p9_sbe.c | 86 +++++++++++++++++++++++++++++++++++++- 1 file changed, 85 insertions(+), 1 deletion(-) diff --git a/drivers/hwmon/occ/p9_sbe.c b/drivers/hwmon/occ/p9_sbe.c index 9709f2b9c052..e50243580269 100644 --- a/drivers/hwmon/occ/p9_sbe.c +++ b/drivers/hwmon/occ/p9_sbe.c @@ -4,18 +4,79 @@ #include #include #include +#include #include +#include #include +#include +#include #include "common.h" struct p9_sbe_occ { struct occ occ; + bool sbe_error; + void *ffdc; + size_t ffdc_len; + size_t ffdc_size; + struct mutex sbe_error_lock; /* lock access to ffdc data */ struct device *sbe; }; #define to_p9_sbe_occ(x) container_of((x), struct p9_sbe_occ, occ) +static ssize_t ffdc_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *battr, char *buf, loff_t pos, + size_t count) +{ + ssize_t rc = 0; + struct occ *occ = dev_get_drvdata(kobj_to_dev(kobj)); + struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ); + + mutex_lock(&ctx->sbe_error_lock); + if (ctx->sbe_error) { + rc = memory_read_from_buffer(buf, count, &pos, ctx->ffdc, + ctx->ffdc_len); + if (pos >= ctx->ffdc_len) + ctx->sbe_error = false; + } + mutex_unlock(&ctx->sbe_error_lock); + + return rc; +} +static BIN_ATTR_RO(ffdc, OCC_MAX_RESP_WORDS * 4); + +static bool p9_sbe_occ_save_ffdc(struct p9_sbe_occ *ctx, const void *resp, + size_t resp_len) +{ + bool notify = false; + + mutex_lock(&ctx->sbe_error_lock); + if (!ctx->sbe_error) { + if (resp_len > ctx->ffdc_size) { + if (ctx->ffdc) + kvfree(ctx->ffdc); + ctx->ffdc = kvmalloc(resp_len, GFP_KERNEL); + if (!ctx->ffdc) { + ctx->ffdc_len = 0; + ctx->ffdc_size = 0; + goto done; + } + + ctx->ffdc_size = resp_len; + } + + notify = true; + ctx->sbe_error = true; + ctx->ffdc_len = resp_len; + memcpy(ctx->ffdc, resp, resp_len); + } + +done: + mutex_unlock(&ctx->sbe_error_lock); + return notify; +} + static int p9_sbe_occ_send_cmd(struct occ *occ, u8 *cmd, size_t len) { struct occ_response *resp = &occ->resp; @@ -24,8 +85,15 @@ static int p9_sbe_occ_send_cmd(struct occ *occ, u8 *cmd, size_t len) int rc; rc = fsi_occ_submit(ctx->sbe, cmd, len, resp, &resp_len); - if (rc < 0) + if (rc < 0) { + if (resp_len) { + if (p9_sbe_occ_save_ffdc(ctx, resp, resp_len)) + sysfs_notify(&occ->bus_dev->kobj, NULL, + bin_attr_ffdc.attr.name); + } + return rc; + } switch (resp->return_status) { case OCC_RESP_CMD_IN_PRG: @@ -65,6 +133,8 @@ static int p9_sbe_occ_probe(struct platform_device *pdev) if (!ctx) return -ENOMEM; + mutex_init(&ctx->sbe_error_lock); + ctx->sbe = pdev->dev.parent; occ = &ctx->occ; occ->bus_dev = &pdev->dev; @@ -78,6 +148,15 @@ static int p9_sbe_occ_probe(struct platform_device *pdev) if (rc == -ESHUTDOWN) rc = -ENODEV; /* Host is shutdown, don't spew errors */ + if (!rc) { + rc = device_create_bin_file(occ->bus_dev, &bin_attr_ffdc); + if (rc) { + dev_warn(occ->bus_dev, + "failed to create SBE error ffdc file\n"); + rc = 0; + } + } + return rc; } @@ -86,9 +165,14 @@ static int p9_sbe_occ_remove(struct platform_device *pdev) struct occ *occ = platform_get_drvdata(pdev); struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ); + device_remove_bin_file(occ->bus_dev, &bin_attr_ffdc); + ctx->sbe = NULL; occ_shutdown(occ); + if (ctx->ffdc) + kvfree(ctx->ffdc); + return 0; }