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Wed, 2 Nov 2022 20:51:55 +0000 (GMT) From: Eddie James To: linux-fsi@lists.ozlabs.org Subject: [PATCH v2 5/5] drivers: fsi: occ and sbefifo refactor Date: Wed, 2 Nov 2022 15:51:48 -0500 Message-Id: <20221102205148.1334459-6-eajames@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20221102205148.1334459-1-eajames@linux.ibm.com> References: <20221102205148.1334459-1-eajames@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: StCS-5kMOa_vh_chlmxfuadpQaN76mI8 X-Proofpoint-GUID: StCS-5kMOa_vh_chlmxfuadpQaN76mI8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-11-02_15,2022-11-02_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 bulkscore=0 suspectscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 phishscore=0 impostorscore=0 spamscore=0 mlxscore=0 adultscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2211020135 X-Mailman-Approved-At: Thu, 03 Nov 2022 09:06:17 +1100 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: rafael@kernel.org, linux-kernel@vger.kernel.org, broonie@kernel.org, alistair@popple.id.au Errors-To: linux-fsi-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "linux-fsi" Rework the drivers to allow for SBEFIFO connected over FSI or I2C. Signed-off-by: Eddie James --- drivers/fsi/Kconfig | 26 +- drivers/fsi/Makefile | 6 +- drivers/fsi/occ-cdev.c | 178 ++++++----- drivers/fsi/occ.c | 495 +++++++++++++------------------ drivers/fsi/occ.h | 57 ++++ drivers/fsi/sbefifo-cdev.c | 239 +++++++-------- drivers/fsi/sbefifo-fsi.c | 68 +++++ drivers/fsi/sbefifo-i2c.c | 73 +++++ drivers/fsi/sbefifo.c | 588 ++++++++++++++----------------------- drivers/fsi/sbefifo.h | 50 ++++ 10 files changed, 920 insertions(+), 860 deletions(-) create mode 100644 drivers/fsi/occ.h create mode 100644 drivers/fsi/sbefifo-fsi.c create mode 100644 drivers/fsi/sbefifo-i2c.c create mode 100644 drivers/fsi/sbefifo.h diff --git a/drivers/fsi/Kconfig b/drivers/fsi/Kconfig index c6049a7bc0dd..ab98c4b718fb 100644 --- a/drivers/fsi/Kconfig +++ b/drivers/fsi/Kconfig @@ -75,15 +75,29 @@ config FSI_I2CR config FSI_SBEFIFO tristate "SBEFIFO FSI client device driver" - depends on OF_ADDRESS + select REGMAP_FSI + select SBEFIFO_CORE help - This option enables an FSI based SBEFIFO device driver. The SBEFIFO is - a pipe-like FSI device for communicating with the self boot engine - (SBE) on POWER processors. + This option enables an FSI based SBEFIFO device driver. The SBEFIFO is + a pipe-like device for communicating with the self boot engine + (SBE) on POWER processors. + +config I2C_SBEFIFO + tristate "SBEFIFO I2C client device driver" + select FSI_I2CR + select SBEFIFO_CORE + help + This option enables an I2C based SBEFIFO device driver. The SBEFIFO is + a pipe-like device for communicating with the self boot engine + (SBE) on POWER processors. + +config SBEFIFO_CORE + tristate + select FSI_OCC config FSI_OCC - tristate "OCC SBEFIFO client device driver" - depends on FSI_SBEFIFO + tristate "OCC communications driver" + depends on SBEFIFO_CORE help This option enables an SBEFIFO based On-Chip Controller (OCC) device driver. The OCC is a device embedded on a POWER processor that collects diff --git a/drivers/fsi/Makefile b/drivers/fsi/Makefile index 1a52fc6c5258..c1d0e020c845 100644 --- a/drivers/fsi/Makefile +++ b/drivers/fsi/Makefile @@ -7,5 +7,9 @@ obj-$(CONFIG_FSI_MASTER_GPIO) += fsi-master-gpio.o obj-$(CONFIG_FSI_MASTER_AST_CF) += fsi-master-ast-cf.o obj-$(CONFIG_FSI_SCOM) += fsi-scom.o obj-$(CONFIG_FSI_I2CR) += i2cr.o -obj-$(CONFIG_FSI_SBEFIFO) += sbefifo.o sbefifo-cdev.o obj-$(CONFIG_FSI_OCC) += occ.o occ-cdev.o + +sbefifo-core-objs := sbefifo.o sbefifo-cdev.o + +obj-$(CONFIG_FSI_SBEFIFO) += sbefifo-core.o sbefifo-fsi.o +obj-$(CONFIG_I2C_SBEFIFO) += sbefifo-core.o sbefifo-i2c.o diff --git a/drivers/fsi/occ-cdev.c b/drivers/fsi/occ-cdev.c index b3be880b5fe8..ff9cfd7d8350 100644 --- a/drivers/fsi/occ-cdev.c +++ b/drivers/fsi/occ-cdev.c @@ -1,132 +1,138 @@ // SPDX-License-Identifier: GPL-2.0 /* Copyright (C) IBM Corporation 2022 */ -static int occ_open(struct inode *inode, struct file *file) +#include +#include +#include +#include +#include +#include +#include + +#include "occ.h" + +static void occ_release_command(struct occ_user *user) { - struct occ_client *client = kzalloc(sizeof(*client), GFP_KERNEL); - struct miscdevice *mdev = file->private_data; - struct occ *occ = to_occ(mdev); + if (user->pending.allocated) + kfree(user->pending.buffer); - if (!client) - return -ENOMEM; + user->pending.buffer = user->buffer; + user->pending.buffer_size = sizeof(user->buffer); + user->pending.data_size = 0; + user->pending.allocated = 0; +} - client->buffer = (u8 *)__get_free_page(GFP_KERNEL); - if (!client->buffer) { - kfree(client); - return -ENOMEM; - } +static int occ_open(struct inode *inode, struct file *file) +{ + struct occ_user *user; - client->occ = occ; - mutex_init(&client->lock); - file->private_data = client; - get_device(occ->dev); + user = kmalloc(sizeof(*user), GFP_KERNEL); + if (!user) + return -ENOMEM; - /* We allocate a 1-page buffer, make sure it all fits */ - BUILD_BUG_ON((OCC_CMD_DATA_BYTES + 3) > PAGE_SIZE); - BUILD_BUG_ON((OCC_RESP_DATA_BYTES + 7) > PAGE_SIZE); + file->private_data = user; + mutex_init(&user->lock); + user->occ = container_of(inode->i_cdev, struct occ, occ); + user->pending.buffer = user->buffer; + user->pending.buffer_size = sizeof(user->buffer); + user->pending.data_size = 0; + user->pending.allocated = 0; + user->pending.pending = 0; + user->pending.resizable = 1; return 0; } -static ssize_t occ_read(struct file *file, char __user *buf, size_t len, - loff_t *offset) +static ssize_t occ_read(struct file *file, char __user *buf, size_t len, loff_t *offset) { - struct occ_client *client = file->private_data; - ssize_t rc = 0; - - if (!client) - return -ENODEV; + struct occ_user *user; + size_t offs = *offset; + int rc; - if (len > OCC_SRAM_BYTES) + if (len + offs > OCC_SRAM_BYTES) return -EINVAL; - mutex_lock(&client->lock); + user = file->private_data; + mutex_lock(&user->lock); - /* This should not be possible ... */ - if (WARN_ON_ONCE(client->read_offset > client->data_size)) { - rc = -EIO; - goto done; + if (!offs) { + if (!user->pending.pending) { + rc = -EAGAIN; + goto done; + } + + user->pending.pending = 0; + + /* 1 byte sequence, 1 byte command type, 2 bytes data size, 2 bytes checksum */ + rc = occ_submit(user->occ, user->pending.buffer, user->pending.data_size + 6, + &user->pending); + if (rc) + goto done; } - /* Grab how much data we have to read */ - rc = min(len, client->data_size - client->read_offset); - if (copy_to_user(buf, client->buffer + client->read_offset, rc)) + rc = min(len, user->pending.data_size - offs); + if (copy_to_user(buf, user->pending.buffer + offs, rc)) rc = -EFAULT; else - client->read_offset += rc; - - done: - mutex_unlock(&client->lock); + *offset += rc; +done: + mutex_unlock(&user->lock); return rc; } -static ssize_t occ_write(struct file *file, const char __user *buf, - size_t len, loff_t *offset) +static ssize_t occ_write(struct file *file, const char __user *buf, size_t len, loff_t *offset) { - struct occ_client *client = file->private_data; - size_t rlen, data_length; - ssize_t rc; - u8 *cmd; - - if (!client) - return -ENODEV; + struct occ_user *user; + int rc; if (len > (OCC_CMD_DATA_BYTES + 3) || len < 3) return -EINVAL; - mutex_lock(&client->lock); + user = file->private_data; + mutex_lock(&user->lock); - /* Construct the command */ - cmd = client->buffer; + if (len > user->pending.buffer_size) { + occ_pending_alloc(&user->pending, len + 3); + if (!user->pending.buffer) { + rc = -ENOMEM; + goto done; + } + } /* - * Copy the user command (assume user data follows the occ command - * format) - * byte 0: command type - * bytes 1-2: data length (msb first) - * bytes 3-n: data + * Copy the user command (assume user data follows the occ command format) + * byte 0: command type + * bytes 1-2: data length (msb first) + * bytes 3-n: data */ - if (copy_from_user(&cmd[1], buf, len)) { + if (copy_from_user(&user->pending.buffer[1], buf, len)) { rc = -EFAULT; + occ_release_command(user); goto done; } - /* Extract data length */ - data_length = (cmd[2] << 8) + cmd[3]; - if (data_length > OCC_CMD_DATA_BYTES) { + user->pending.data_size = (user->pending.buffer[2] << 8) + user->pending.buffer[3]; + if (user->pending.data_size > OCC_CMD_DATA_BYTES) { rc = -EINVAL; + occ_release_command(user); goto done; } - /* Submit command; 4 bytes before the data and 2 bytes after */ - rlen = PAGE_SIZE; - rc = fsi_occ_submit(client->occ->dev, cmd, data_length + 6, cmd, - &rlen); - if (rc) - goto done; - - /* Set read tracking data */ - client->data_size = rlen; - client->read_offset = 0; - - /* Done */ + user->pending.pending = 1; rc = len; - done: - mutex_unlock(&client->lock); - +done: + mutex_unlock(&user->lock); return rc; } static int occ_release(struct inode *inode, struct file *file) { - struct occ_client *client = file->private_data; - - put_device(client->occ->dev); - free_page((unsigned long)client->buffer); - kfree(client); + struct occ_user *user = file->private_data; + occ_release_command(user); + kfree(user); return 0; } @@ -136,4 +142,16 @@ static const struct file_operations occ_fops = { .read = occ_read, .write = occ_write, .release = occ_release, -}; \ No newline at end of file +}; + +void occ_cdev_init(struct occ *occ) +{ + int rc; + + cdev_init(&occ->occ, &occ_fops); + rc = cdev_device_add(&occ->occ, &occ->dev); + if (rc) { + occ->no_cdev = 1; + dev_err(&occ->dev, "Failed to create char device: %d.\n", rc); + } +} diff --git a/drivers/fsi/occ.c b/drivers/fsi/occ.c index 83429b0289e9..37834219f64d 100644 --- a/drivers/fsi/occ.c +++ b/drivers/fsi/occ.c @@ -1,30 +1,18 @@ // SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) IBM Corporation 2022 */ -#include -#include -#include -#include +#include +#include #include -#include -#include -#include -#include -#include +#include #include -#include -#include -#include -#include -#include #include -#include +#include #include -#include #include -#define OCC_SRAM_BYTES 4096 -#define OCC_CMD_DATA_BYTES 4090 -#define OCC_RESP_DATA_BYTES 4089 +#include "occ.h" +#include "sbefifo.h" #define OCC_P9_SRAM_CMD_ADDR 0xFFFBE000 #define OCC_P9_SRAM_RSP_ADDR 0xFFFBF000 @@ -37,64 +25,61 @@ #define OCC_TIMEOUT_MS 1000 #define OCC_CMD_IN_PRG_WAIT_MS 50 -enum versions { occ_p9, occ_p10 }; - -struct occ { - struct device *dev; - struct device *sbefifo; - char name[32]; - int idx; - bool platform_hwmon; - 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; -}; - -#define to_occ(x) container_of((x), struct occ, mdev) - struct occ_response { u8 seq_no; u8 cmd_type; u8 return_status; __be16 data_length; - u8 data[OCC_RESP_DATA_BYTES + 2]; /* two bytes checksum */ + u8 data[OCC_RESP_DATA_BYTES]; + u16 checksum; } __packed; -struct occ_client { - struct occ *occ; - struct mutex lock; - size_t data_size; - size_t read_offset; - u8 *buffer; -}; +void occ_pending_alloc(struct occ_pending *pending, size_t size) +{ + if (pending->allocated) { + void *b = krealloc(pending->buffer, size, GFP_KERNEL); -#define to_client(x) container_of((x), struct occ_client, xfr) + if (!b) + kfree(pending->buffer); -static DEFINE_IDA(occ_ida); + pending->buffer = b; + } else { + pending->buffer = kmalloc(size, GFP_KERNEL); + pending->allocated = 1; + } -static void occ_save_ffdc(struct occ *occ, __be32 *resp, size_t parsed_len, - size_t resp_len) + pending->buffer_size = size; +} + +static int occ_store(const void *data, size_t size, struct occ_pending *pending) +{ + if (size > pending->buffer_size) { + if (!pending->resizable) + return -ENOBUFS; + + occ_pending_alloc(pending, size); + if (!pending->buffer) + return -ENOMEM; + } + + memcpy(pending->buffer, data, size); + pending->data_size = size; + return 0; +} + +static void occ_save_ffdc(struct occ *occ, __be32 *resp, size_t parsed_len, size_t resp_len, + struct occ_pending *pending) { if (resp_len > parsed_len) { size_t dh = resp_len - parsed_len; size_t ffdc_len = (dh - 1) * 4; /* SBE words are four bytes */ __be32 *ffdc = &resp[parsed_len]; - 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; + occ_store(ffdc, ffdc_len, pending); } } -static int occ_verify_checksum(struct occ *occ, struct occ_response *resp, - u16 data_length) +static int occ_verify_checksum(struct occ *occ, struct occ_response *resp, u16 data_length) { /* Fetch the two bytes after the data for the checksum. */ u16 checksum_resp = get_unaligned_be16(&resp->data[data_length]); @@ -110,22 +95,24 @@ static int occ_verify_checksum(struct occ *occ, struct occ_response *resp, checksum += resp->data[i]; if (checksum != checksum_resp) { - dev_err(occ->dev, "Bad checksum: %04x!=%04x\n", checksum, - checksum_resp); + dev_err(&occ->dev, "Bad checksum: %04x!=%04x\n", checksum, checksum_resp); return -EBADE; } return 0; } -static int occ_getsram(struct occ *occ, u32 offset, void *data, ssize_t len) +static int occ_getsram(struct occ *occ, u32 offset, ssize_t len, struct occ_pending *pending) { - u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */ - size_t cmd_len, parsed_len, resp_data_len; size_t resp_len = OCC_MAX_RESP_WORDS; - __be32 *resp = occ->buffer; + u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */ + __be32 *resp = (__be32 *)occ->buffer; + size_t resp_data_len; + size_t parsed_len; + size_t cmd_len; __be32 cmd[6]; - int idx = 0, rc; + int idx = 0; + int rc; /* * Magic sequence to do SBE getsram command. SBE will fetch data from @@ -151,16 +138,15 @@ 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); - rc = sbefifo_submit(occ->sbefifo, cmd, cmd_len, resp, &resp_len); + rc = sbefifo_submit(&occ->sbefifo->dev, cmd, cmd_len, resp, &resp_len); if (rc) return rc; - rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_GET_OCC_SRAM, - resp, resp_len, &parsed_len); + rc = sbefifo_parse_status(&occ->sbefifo->dev, SBEFIFO_CMD_GET_OCC_SRAM, resp, resp_len, + &parsed_len); if (rc > 0) { - dev_err(occ->dev, "SRAM read returned failure status: %08x\n", - rc); - occ_save_ffdc(occ, resp, parsed_len, resp_len); + dev_err(&occ->dev, "SRAM read returned failure status: %08x\n", rc); + occ_save_ffdc(occ, resp, parsed_len, resp_len, pending); return -ECOMM; } else if (rc) { return rc; @@ -168,25 +154,26 @@ static int occ_getsram(struct occ *occ, u32 offset, void *data, ssize_t len) 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); + dev_err(&occ->dev, "SRAM read expected %d bytes got %zd\n", data_len, + resp_data_len); rc = -EBADMSG; - } else { - memcpy(data, resp, len); } return rc; } -static int occ_putsram(struct occ *occ, const void *data, ssize_t len, - u8 seq_no, u16 checksum) +static int occ_putsram(struct occ *occ, const void *data, ssize_t len, u8 seq_no, u16 checksum, + struct occ_pending *pending) { - u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */ - size_t cmd_len, parsed_len, resp_data_len; size_t resp_len = OCC_MAX_RESP_WORDS; - __be32 *buf = occ->buffer; + u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */ + __be32 *buf = (__be32 *)occ->buffer; + size_t resp_data_len; + size_t parsed_len; + size_t cmd_len; u8 *byte_buf; - int idx = 0, rc; + int idx = 0; + int rc; cmd_len = (occ->version == occ_p10) ? 6 : 5; cmd_len += data_len >> 2; @@ -224,31 +211,28 @@ static int occ_putsram(struct occ *occ, const void *data, ssize_t len, byte_buf[len - 2] = checksum >> 8; byte_buf[len - 1] = checksum & 0xff; - rc = sbefifo_submit(occ->sbefifo, buf, cmd_len, buf, &resp_len); + rc = sbefifo_submit(&occ->sbefifo->dev, buf, cmd_len, buf, &resp_len); if (rc) return rc; - rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM, - buf, resp_len, &parsed_len); + rc = sbefifo_parse_status(&occ->sbefifo->dev, SBEFIFO_CMD_PUT_OCC_SRAM, buf, resp_len, + &parsed_len); if (rc > 0) { - dev_err(occ->dev, "SRAM write returned failure status: %08x\n", - rc); - occ_save_ffdc(occ, buf, parsed_len, resp_len); + dev_err(&occ->dev, "SRAM write returned failure status: %08x\n", rc); + occ_save_ffdc(occ, buf, parsed_len, resp_len, pending); return -ECOMM; } else if (rc) { return rc; } if (parsed_len != 1) { - dev_err(occ->dev, "SRAM write response length invalid: %zd\n", - parsed_len); + dev_err(&occ->dev, "SRAM write response length invalid: %zd\n", parsed_len); rc = -EBADMSG; } else { resp_data_len = be32_to_cpu(buf[0]); if (resp_data_len != data_len) { - dev_err(occ->dev, - "SRAM write expected %d bytes got %zd\n", - data_len, resp_data_len); + dev_err(&occ->dev, "SRAM write expected %d bytes got %zd\n", data_len, + resp_data_len); rc = -EBADMSG; } } @@ -256,12 +240,15 @@ static int occ_putsram(struct occ *occ, const void *data, ssize_t len, return rc; } -static int occ_trigger_attn(struct occ *occ) +static int occ_trigger_attn(struct occ *occ, struct occ_pending *pending) { - __be32 *buf = occ->buffer; - size_t cmd_len, parsed_len, resp_data_len; size_t resp_len = OCC_MAX_RESP_WORDS; - int idx = 0, rc; + __be32 *buf = (__be32 *)occ->buffer; + size_t resp_data_len; + size_t parsed_len; + size_t cmd_len; + int idx = 0; + int rc; switch (occ->version) { default: @@ -285,31 +272,27 @@ static int occ_trigger_attn(struct occ *occ) buf[5 + idx] = cpu_to_be32(0x20010000); /* Trigger OCC attention */ buf[6 + idx] = 0; - rc = sbefifo_submit(occ->sbefifo, buf, cmd_len, buf, &resp_len); + rc = sbefifo_submit(&occ->sbefifo->dev, buf, cmd_len, buf, &resp_len); if (rc) return rc; - rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM, - buf, resp_len, &parsed_len); + rc = sbefifo_parse_status(&occ->sbefifo->dev, SBEFIFO_CMD_PUT_OCC_SRAM, buf, resp_len, + &parsed_len); if (rc > 0) { - dev_err(occ->dev, "SRAM attn returned failure status: %08x\n", - rc); - occ_save_ffdc(occ, buf, parsed_len, resp_len); + dev_err(&occ->dev, "SRAM attn returned failure status: %08x\n", rc); + occ_save_ffdc(occ, buf, parsed_len, resp_len, pending); return -ECOMM; } else if (rc) { return rc; } if (parsed_len != 1) { - dev_err(occ->dev, "SRAM attn response length invalid: %zd\n", - parsed_len); + dev_err(&occ->dev, "SRAM attn response length invalid: %zd\n", parsed_len); rc = -EBADMSG; } else { resp_data_len = be32_to_cpu(buf[0]); if (resp_data_len != 8) { - dev_err(occ->dev, - "SRAM attn expected 8 bytes got %zd\n", - resp_data_len); + dev_err(&occ->dev, "SRAM attn expected 8 bytes got %zd\n", resp_data_len); rc = -EBADMSG; } } @@ -317,61 +300,37 @@ static int occ_trigger_attn(struct occ *occ) return rc; } -static bool fsi_occ_response_not_ready(struct occ_response *resp, u8 seq_no, - u8 cmd_type) +static bool occ_response_not_ready(struct occ_response *resp, u8 seq_no, u8 cmd_type) { return resp->return_status == OCC_RESP_CMD_IN_PRG || resp->return_status == OCC_RESP_CRIT_INIT || resp->seq_no != seq_no || resp->cmd_type != cmd_type; } -int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, - void *response, size_t *resp_len) +int occ_submit(struct occ *occ, const u8 *request, size_t request_size, + struct occ_pending *pending) { + const unsigned long wait_time = msecs_to_jiffies(OCC_CMD_IN_PRG_WAIT_MS); const unsigned long timeout = msecs_to_jiffies(OCC_TIMEOUT_MS); - const unsigned long wait_time = - 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; - u8 cmd_type; - u16 checksum = 0; - u16 resp_data_length; - const u8 *byte_request = (const u8 *)request; + struct occ_response *resp = (struct occ_response *)occ->buffer; + u8 cmd_type = request[1]; + size_t resp_data_length; unsigned long end; + u16 checksum = 0; + u8 seq_no; int rc; - size_t i; - - *resp_len = 0; + int i; - if (!occ) + if (occ->dead) return -ENODEV; - if (user_resp_len < 7) { - dev_dbg(dev, "Bad resplen %zd\n", user_resp_len); - return -EINVAL; - } - - cmd_type = byte_request[1]; - - /* Checksum the request, ignoring first byte (sequence number). */ - for (i = 1; i < req_len - 2; ++i) - checksum += byte_request[i]; + for (i = 1; i < request_size - 2; ++i) + checksum += request[i]; - rc = mutex_lock_interruptible(&occ->occ_lock); + rc = mutex_lock_interruptible(&occ->lock); if (rc) return rc; - occ->client_buffer = response; - occ->client_buffer_size = user_resp_len; - occ->client_response_size = 0; - - if (!occ->buffer) { - rc = -ENOENT; - goto done; - } - /* * Get a sequence number and update the counter. Avoid a sequence * number of 0 which would pass the response check below even if the @@ -385,27 +344,27 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, occ->sequence_number = 1; checksum += seq_no; - rc = occ_putsram(occ, request, req_len, seq_no, checksum); + rc = occ_putsram(occ, request, request_size, seq_no, checksum, pending); if (rc) goto done; - rc = occ_trigger_attn(occ); + rc = occ_trigger_attn(occ, pending); if (rc) goto done; end = jiffies + timeout; while (true) { /* Read occ response header */ - rc = occ_getsram(occ, 0, resp, 8); + rc = occ_getsram(occ, 0, 8, pending); if (rc) goto done; - if (fsi_occ_response_not_ready(resp, seq_no, cmd_type)) { + if (occ_response_not_ready(resp, seq_no, cmd_type)) { if (time_after(jiffies, end)) { - dev_err(occ->dev, - "resp timeout status=%02x seq=%d cmd=%d, our seq=%d cmd=%d\n", - resp->return_status, resp->seq_no, - resp->cmd_type, seq_no, cmd_type); + dev_err(&occ->dev, + "resp timeout sts=%02x seq=%d cmd=%d, our seq=%d cmd=%d\n", + resp->return_status, resp->seq_no, resp->cmd_type, seq_no, + cmd_type); rc = -ETIMEDOUT; goto done; } @@ -414,14 +373,13 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, schedule_timeout(wait_time); } else { /* Extract size of response data */ - resp_data_length = - get_unaligned_be16(&resp->data_length); + 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) > user_resp_len) { + if ((resp_data_length + 7) > sizeof(occ->buffer)) { rc = -EMSGSIZE; goto done; } @@ -431,13 +389,11 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, * in case it changed */ if (resp_data_length > 1) { - rc = occ_getsram(occ, 0, resp, - resp_data_length + 7); + rc = occ_getsram(occ, 0, resp_data_length + 7, pending); if (rc) goto done; - if (!fsi_occ_response_not_ready(resp, seq_no, - cmd_type)) + if (!occ_response_not_ready(resp, seq_no, cmd_type)) break; } else { break; @@ -445,185 +401,136 @@ int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, } } - dev_dbg(dev, "resp_status=%02x resp_data_len=%d\n", - resp->return_status, resp_data_length); - rc = occ_verify_checksum(occ, resp, resp_data_length); if (rc) goto done; - occ->client_response_size = resp_data_length + 7; - - done: - *resp_len = occ->client_response_size; - mutex_unlock(&occ->occ_lock); + rc = occ_store(resp, resp_data_length + 7, pending); +done: + mutex_unlock(&occ->lock); return rc; } -EXPORT_SYMBOL_GPL(fsi_occ_submit); -static int occ_unregister_platform_child(struct device *dev, void *data) +static void occ_free(struct device *dev) { - struct platform_device *hwmon_dev = to_platform_device(dev); + struct occ *occ = container_of(dev, struct occ, dev); - platform_device_unregister(hwmon_dev); + put_device(dev->parent); + kvfree(occ); +} - return 0; +static const struct property_entry hwmon_properties[] = { + PROPERTY_ENTRY_BOOL("ibm,no-poll-on-init"), + { } +}; + +static void occ_register_hwmon(struct occ *occ, int idx) +{ + struct platform_device_info hwmon_dev_info = { + .parent = &occ->dev, + .name = "occ-hwmon", + .id = idx, + .properties = hwmon_properties, + }; + struct platform_device *hwmon_dev; + + hwmon_dev = platform_device_register_full(&hwmon_dev_info); + if (IS_ERR(hwmon_dev)) + dev_warn(&occ->dev, "Failed to create hwmon device: %ld.\n", PTR_ERR(hwmon_dev)); } -static int occ_unregister_of_child(struct device *dev, void *data) +static int occ_unregister_child(struct device *dev, void *data) { struct platform_device *hwmon_dev = to_platform_device(dev); - of_device_unregister(hwmon_dev); - if (dev->of_node) - of_node_clear_flag(dev->of_node, OF_POPULATED); + platform_device_unregister(hwmon_dev); return 0; } -static int occ_probe(struct platform_device *pdev) +struct occ *occ_create(struct sbefifo *sbefifo, + int (*get_devt)(struct device *, int, dev_t *, int *), enum versions v) { - int rc; - u32 reg; - char child_name[32]; struct occ *occ; - struct platform_device *hwmon_dev = NULL; - struct device_node *hwmon_node; - struct device *dev = &pdev->dev; - struct platform_device_info hwmon_dev_info = { - .parent = dev, - .name = "occ-hwmon", - }; + int idx; + int rc; + + if (!get_device(&sbefifo->dev)) + return NULL; - occ = devm_kzalloc(dev, sizeof(*occ), GFP_KERNEL); - if (!occ) - return -ENOMEM; + occ = kvzalloc(sizeof(*occ), GFP_KERNEL); + if (!occ) { + put_device(&sbefifo->dev); + return NULL; + } + + rc = get_devt(sbefifo->dev.parent, (int)fsi_dev_occ, &occ->dev.devt, &idx); + if (rc) { + kvfree(occ); + put_device(&sbefifo->dev); + return NULL; + } + + occ->dev.type = &fsi_cdev_type; + occ->dev.parent = &sbefifo->dev; + occ->dev.release = occ_free; + device_initialize(&occ->dev); + dev_set_name(&occ->dev, "occ%d", idx); - /* SBE words are always four bytes */ - occ->buffer = kvmalloc(OCC_MAX_RESP_WORDS * 4, GFP_KERNEL); - if (!occ->buffer) - return -ENOMEM; + occ_cdev_init(occ); - occ->version = (uintptr_t)of_device_get_match_data(dev); - occ->dev = dev; - occ->sbefifo = dev->parent; + mutex_init(&occ->lock); + occ->sbefifo = sbefifo; + occ->version = v; /* * Quickly derive a pseudo-random number from jiffies so that * re-probing the driver doesn't accidentally overlap sequence numbers. */ occ->sequence_number = (u8)((jiffies % 0xff) + 1); - mutex_init(&occ->occ_lock); - - if (dev->of_node) { - rc = of_property_read_u32(dev->of_node, "reg", ®); - if (!rc) { - /* make sure we don't have a duplicate from dts */ - occ->idx = ida_simple_get(&occ_ida, reg, reg + 1, - GFP_KERNEL); - if (occ->idx < 0) - occ->idx = ida_simple_get(&occ_ida, 1, INT_MAX, - GFP_KERNEL); - } else { - occ->idx = ida_simple_get(&occ_ida, 1, INT_MAX, - GFP_KERNEL); - } - } else { - occ->idx = ida_simple_get(&occ_ida, 1, INT_MAX, GFP_KERNEL); - } - - platform_set_drvdata(pdev, occ); - - snprintf(occ->name, sizeof(occ->name), "occ%d", occ->idx); - occ->mdev.fops = &occ_fops; - occ->mdev.minor = MISC_DYNAMIC_MINOR; - occ->mdev.name = occ->name; - occ->mdev.parent = dev; - - rc = misc_register(&occ->mdev); - if (rc) { - dev_err(dev, "failed to register miscdevice: %d\n", rc); - ida_simple_remove(&occ_ida, occ->idx); - kvfree(occ->buffer); - return rc; - } - hwmon_node = of_get_child_by_name(dev->of_node, hwmon_dev_info.name); - if (hwmon_node) { - snprintf(child_name, sizeof(child_name), "%s.%d", hwmon_dev_info.name, occ->idx); - hwmon_dev = of_platform_device_create(hwmon_node, child_name, dev); - of_node_put(hwmon_node); - } - - if (!hwmon_dev) { - occ->platform_hwmon = true; - hwmon_dev_info.id = occ->idx; - hwmon_dev = platform_device_register_full(&hwmon_dev_info); - if (IS_ERR(hwmon_dev)) - dev_warn(dev, "failed to create hwmon device\n"); - } + occ_register_hwmon(occ, idx); - return 0; + return occ; } +EXPORT_SYMBOL_GPL(occ_create); -static int occ_remove(struct platform_device *pdev) +void occ_destroy(struct occ *occ, void(*free_devt)(dev_t)) { - struct occ *occ = platform_get_drvdata(pdev); - - misc_deregister(&occ->mdev); + occ->dead = 1; - mutex_lock(&occ->occ_lock); - kvfree(occ->buffer); - occ->buffer = NULL; - mutex_unlock(&occ->occ_lock); + device_for_each_child(&occ->dev, NULL, occ_unregister_child); - if (occ->platform_hwmon) - device_for_each_child(&pdev->dev, NULL, occ_unregister_platform_child); - else - device_for_each_child(&pdev->dev, NULL, occ_unregister_of_child); + if (free_devt) + free_devt(occ->dev.devt); - ida_simple_remove(&occ_ida, occ->idx); + if (!occ->no_cdev) + cdev_device_del(&occ->occ, &occ->dev); - return 0; + put_device(&occ->dev); } +EXPORT_SYMBOL_GPL(occ_destroy); -static const struct of_device_id occ_match[] = { - { - .compatible = "ibm,p9-occ", - .data = (void *)occ_p9 - }, - { - .compatible = "ibm,p10-occ", - .data = (void *)occ_p10 - }, - { }, -}; -MODULE_DEVICE_TABLE(of, occ_match); - -static struct platform_driver occ_driver = { - .driver = { - .name = "occ", - .of_match_table = occ_match, - }, - .probe = occ_probe, - .remove = occ_remove, -}; - -static int occ_init(void) +int fsi_occ_submit(struct device *dev, const void *request, size_t req_len, void *response, + size_t *resp_len) { - return platform_driver_register(&occ_driver); -} + struct occ *occ = container_of(dev, struct occ, dev); + struct occ_pending pending; + int rc; -static void occ_exit(void) -{ - platform_driver_unregister(&occ_driver); + pending.buffer = response; + pending.buffer_size = *resp_len; + pending.data_size = 0; + pending.allocated = 0; + pending.resizable = 0; + pending.pending = 0; - ida_destroy(&occ_ida); + rc = occ_submit(occ, request, req_len, &pending); + *resp_len = pending.data_size; + return rc; } - -module_init(occ_init); -module_exit(occ_exit); +EXPORT_SYMBOL_GPL(fsi_occ_submit); MODULE_AUTHOR("Eddie James "); -MODULE_DESCRIPTION("BMC P9 OCC driver"); +MODULE_DESCRIPTION("OCC communications driver"); MODULE_LICENSE("GPL"); diff --git a/drivers/fsi/occ.h b/drivers/fsi/occ.h new file mode 100644 index 000000000000..bbb1b3aecdeb --- /dev/null +++ b/drivers/fsi/occ.h @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* Copyright (C) IBM Corporation 2022 */ + +#ifndef DRIVERS_OCC_H +#define DRIVERS_OCC_H + +#include +#include +#include +#include +#include + +#define OCC_SRAM_BYTES 4096 +#define OCC_CMD_DATA_BYTES 4090 +#define OCC_RESP_DATA_BYTES 4089 + +struct sbefifo; + +enum versions { occ_p9, occ_p10, }; + +struct occ { + struct device dev; + struct cdev occ; + struct mutex lock; // device lock + struct sbefifo *sbefifo; + enum versions version; + u8 sequence_number; + u8 dead : 1; + u8 no_cdev : 1; + u8 buffer[OCC_MAX_RESP_WORDS * 4]; +}; + +struct occ_pending { + u8 *buffer; + size_t buffer_size; + size_t data_size; + u8 allocated : 1; + u8 pending : 1; + u8 resizable : 1; +}; + +struct occ_user { + struct mutex lock; // file lock + struct occ *occ; + struct occ_pending pending; + u8 buffer[128]; +}; + +void occ_cdev_init(struct occ *occ); +struct occ *occ_create(struct sbefifo *sbefifo, + int (*get_devt)(struct device *, int, dev_t *, int *), enum versions v); +void occ_destroy(struct occ *occ, void(*free_devt)(dev_t)); +void occ_pending_alloc(struct occ_pending *pending, size_t size); +int occ_submit(struct occ *occ, const u8 *request, size_t request_size, + struct occ_pending *pending); + +#endif /* DRIVERS_OCC_H */ diff --git a/drivers/fsi/sbefifo-cdev.c b/drivers/fsi/sbefifo-cdev.c index 75765e8c307a..ba34b1436557 100644 --- a/drivers/fsi/sbefifo-cdev.c +++ b/drivers/fsi/sbefifo-cdev.c @@ -1,217 +1,218 @@ // SPDX-License-Identifier: GPL-2.0 /* Copyright (C) IBM Corporation 2022 */ -/* - * Char device interface - */ +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "sbefifo.h" + +struct sbefifo_user { + struct mutex lock; // file lock + struct sbefifo *sbefifo; + struct { + void *buffer; + size_t size; + } pending; + unsigned int timeout; + u8 buffer[128]; +}; static void sbefifo_release_command(struct sbefifo_user *user) { - if (is_vmalloc_addr(user->pending_cmd)) - vfree(user->pending_cmd); - user->pending_cmd = NULL; - user->pending_len = 0; + if (user->pending.buffer != user->buffer) + kvfree(user->pending.buffer); + + user->pending.buffer = NULL; + user->pending.size = 0; } -static int sbefifo_user_open(struct inode *inode, struct file *file) +static int sbefifo_open(struct inode *inode, struct file *file) { - struct sbefifo *sbefifo = container_of(inode->i_cdev, struct sbefifo, cdev); struct sbefifo_user *user; - user = kzalloc(sizeof(struct sbefifo_user), GFP_KERNEL); + user = kmalloc(sizeof(*user), GFP_KERNEL); if (!user) return -ENOMEM; file->private_data = user; - user->sbefifo = sbefifo; - user->cmd_page = (void *)__get_free_page(GFP_KERNEL); - if (!user->cmd_page) { - kfree(user); - return -ENOMEM; - } - mutex_init(&user->file_lock); - user->read_timeout_ms = SBEFIFO_TIMEOUT_START_RSP; + mutex_init(&user->lock); + user->sbefifo = container_of(inode->i_cdev, struct sbefifo, sbe); + user->pending.buffer = NULL; + user->pending.size = 0; + user->timeout = SBEFIFO_TIMEOUT_START_RSP; return 0; } -static ssize_t sbefifo_user_read(struct file *file, char __user *buf, - size_t len, loff_t *offset) +static ssize_t sbefifo_read(struct file *file, char __user *buf, size_t len, loff_t *offset) { - struct sbefifo_user *user = file->private_data; - struct sbefifo *sbefifo; + struct sbefifo_user *user; struct iov_iter resp_iter; - struct iovec resp_iov; - size_t cmd_len; + struct iovec resp_iov; int rc; - if (!user) - return -EINVAL; - sbefifo = user->sbefifo; if (len & 3) return -EINVAL; - mutex_lock(&user->file_lock); + user = file->private_data; + mutex_lock(&user->lock); - /* Cronus relies on -EAGAIN after a short read */ - if (user->pending_len == 0) { + if (!user->pending.size) { rc = -EAGAIN; - goto bail; + goto done; } - if (user->pending_len < 8) { + + if (user->pending.size < 8) { rc = -EINVAL; - goto bail; + goto done; } - cmd_len = user->pending_len >> 2; - /* Prepare iov iterator */ resp_iov.iov_base = buf; resp_iov.iov_len = len; iov_iter_init(&resp_iter, WRITE, &resp_iov, 1, len); - /* Perform the command */ - rc = mutex_lock_interruptible(&sbefifo->lock); + rc = mutex_lock_interruptible(&user->sbefifo->lock); + if (rc) + goto done; + user->sbefifo->timeout = user->timeout; + rc = sbefifo_submit_internal(user->sbefifo, user->pending.buffer, user->pending.size >> 2, + &resp_iter); + user->sbefifo->timeout = SBEFIFO_TIMEOUT_START_RSP; + mutex_unlock(&user->sbefifo->lock); if (rc) - goto bail; - sbefifo->timeout_start_rsp_ms = user->read_timeout_ms; - rc = __sbefifo_submit(sbefifo, user->pending_cmd, cmd_len, &resp_iter); - sbefifo->timeout_start_rsp_ms = SBEFIFO_TIMEOUT_START_RSP; - mutex_unlock(&sbefifo->lock); - if (rc < 0) - goto bail; - - /* Extract the response length */ + goto done; + rc = len - iov_iter_count(&resp_iter); - bail: + +done: sbefifo_release_command(user); - mutex_unlock(&user->file_lock); + mutex_unlock(&user->lock); return rc; } -static ssize_t sbefifo_user_write(struct file *file, const char __user *buf, - size_t len, loff_t *offset) +static ssize_t sbefifo_write(struct file *file, const char __user *buf, size_t len, loff_t *offset) { - struct sbefifo_user *user = file->private_data; - struct sbefifo *sbefifo; - int rc = len; + struct sbefifo_user *user; + int rc; - if (!user) - return -EINVAL; - sbefifo = user->sbefifo; - if (len > SBEFIFO_MAX_USER_CMD_LEN) - return -EINVAL; - if (len & 3) + if (len > SBEFIFO_MAX_USER_CMD_LEN || len & 3) return -EINVAL; - mutex_lock(&user->file_lock); - - /* Can we use the pre-allocate buffer ? If not, allocate */ - if (len <= PAGE_SIZE) - user->pending_cmd = user->cmd_page; - else - user->pending_cmd = vmalloc(len); - if (!user->pending_cmd) { - rc = -ENOMEM; - goto bail; + user = file->private_data; + mutex_lock(&user->lock); + + if (len <= sizeof(user->buffer)) { + user->pending.buffer = user->buffer; + } else { + user->pending.buffer = kvmalloc(len, GFP_KERNEL); + if (!user->pending.buffer) { + user->pending.size = 0; + rc = -ENOMEM; + goto done; + } } - /* Copy the command into the staging buffer */ - if (copy_from_user(user->pending_cmd, buf, len)) { + if (copy_from_user(user->pending.buffer, buf, len)) { rc = -EFAULT; - goto bail; + sbefifo_release_command(user); + goto done; } /* Check for the magic reset command */ - if (len == 4 && be32_to_cpu(*(__be32 *)user->pending_cmd) == - SBEFIFO_RESET_MAGIC) { + if (len == 4 && be32_to_cpu(*(__be32 *)user->pending.buffer) == SBEFIFO_RESET_MAGIC) { + user->pending.buffer = NULL; + user->pending.size = 0; - /* Clear out any pending command */ - user->pending_len = 0; - - /* Trigger reset request */ - rc = mutex_lock_interruptible(&sbefifo->lock); + rc = mutex_lock_interruptible(&user->sbefifo->lock); if (rc) - goto bail; + goto done; rc = sbefifo_request_reset(user->sbefifo); - mutex_unlock(&sbefifo->lock); - if (rc == 0) + mutex_unlock(&user->sbefifo->lock); + if (!rc) rc = 4; - goto bail; + } else { + user->pending.size = len; + rc = len; } - /* Update the staging buffer size */ - user->pending_len = len; - bail: - if (!user->pending_len) - sbefifo_release_command(user); - - mutex_unlock(&user->file_lock); - - /* And that's it, we'll issue the command on a read */ +done: + mutex_unlock(&user->lock); return rc; } -static int sbefifo_user_release(struct inode *inode, struct file *file) +static int sbefifo_release(struct inode *inode, struct file *file) { struct sbefifo_user *user = file->private_data; - if (!user) - return -EINVAL; - sbefifo_release_command(user); - free_page((unsigned long)user->cmd_page); kfree(user); - return 0; } static int sbefifo_read_timeout(struct sbefifo_user *user, void __user *argp) { - struct device *dev = &user->sbefifo->dev; u32 timeout; if (get_user(timeout, (__u32 __user *)argp)) return -EFAULT; - if (timeout == 0) { - user->read_timeout_ms = SBEFIFO_TIMEOUT_START_RSP; - dev_dbg(dev, "Timeout reset to %d\n", user->read_timeout_ms); + if (!timeout) { + user->timeout = SBEFIFO_TIMEOUT_START_RSP; return 0; } if (timeout < 10 || timeout > 120) return -EINVAL; - user->read_timeout_ms = timeout * 1000; /* user timeout is in sec */ - - dev_dbg(dev, "Timeout set to %d\n", user->read_timeout_ms); - + user->timeout = timeout * 1000; return 0; } -static long sbefifo_user_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +static long sbefifo_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { - struct sbefifo_user *user = file->private_data; - int rc = -ENOTTY; + struct sbefifo_user *user; + int rc; - if (!user) - return -EINVAL; + user = file->private_data; + mutex_lock(&user->lock); - mutex_lock(&user->file_lock); switch (cmd) { case FSI_SBEFIFO_READ_TIMEOUT_SECONDS: rc = sbefifo_read_timeout(user, (void __user *)arg); break; + default: + rc = -ENOTTY; + break; } - mutex_unlock(&user->file_lock); + + mutex_unlock(&user->lock); return rc; } static const struct file_operations sbefifo_fops = { - .owner = THIS_MODULE, - .open = sbefifo_user_open, - .read = sbefifo_user_read, - .write = sbefifo_user_write, - .release = sbefifo_user_release, - .unlocked_ioctl = sbefifo_user_ioctl, + .owner = THIS_MODULE, + .open = sbefifo_open, + .read = sbefifo_read, + .write = sbefifo_write, + .release = sbefifo_release, + .unlocked_ioctl = sbefifo_ioctl, }; + +void sbefifo_cdev_init(struct sbefifo *sbefifo) +{ + int rc; + + cdev_init(&sbefifo->sbe, &sbefifo_fops); + rc = cdev_device_add(&sbefifo->sbe, &sbefifo->dev); + if (rc) { + sbefifo->no_cdev = 1; + dev_err(&sbefifo->dev, "Failed to create char device: %d.\n", rc); + } +} diff --git a/drivers/fsi/sbefifo-fsi.c b/drivers/fsi/sbefifo-fsi.c new file mode 100644 index 000000000000..9b425cf71ca8 --- /dev/null +++ b/drivers/fsi/sbefifo-fsi.c @@ -0,0 +1,68 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) IBM Corporation 2022 */ + +#include +#include +#include +#include + +#include "sbefifo.h" + +static int sbefifo_fsi_get_devt(struct device *dev, int type, dev_t *devt, int *idx) +{ + return fsi_get_new_minor(to_fsi_dev(dev), (enum fsi_dev_type)type, devt, idx); +} + +static int sbefifo_fsi_probe(struct device *dev) +{ + struct regmap_config cfg = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .disable_locking = true, + .cache_type = REGCACHE_NONE, + .val_format_endian = REGMAP_ENDIAN_BIG, + }; + struct fsi_device *fsi_dev; + struct regmap *regmap; + struct sbefifo *sbefifo; + + fsi_dev = to_fsi_dev(dev); + regmap = regmap_init_fsi(fsi_dev, &cfg); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + sbefifo = sbefifo_create(dev, regmap, sbefifo_fsi_get_devt); + if (IS_ERR(sbefifo)) { + regmap_exit(regmap); + return PTR_ERR(sbefifo); + } + + sbefifo->fsi_dev = fsi_dev; + dev_set_drvdata(dev, sbefifo); + + return 0; +} + +static int sbefifo_fsi_remove(struct device *dev) +{ + sbefifo_destroy(dev_get_drvdata(dev), fsi_free_minor); + return 0; +} + +static const struct fsi_device_id sbefifo_fsi_ids[] = { + { .engine_type = 0x22, .version = FSI_VERSION_ANY, }, + { } +}; + +static struct fsi_driver sbefifo_fsi_driver = { + .drv = { + .name = SBEFIFO_DEVICE_NAME, + .bus = &fsi_bus_type, + .probe = sbefifo_fsi_probe, + .remove = sbefifo_fsi_remove, + }, + .id_table = sbefifo_fsi_ids, +}; + +module_fsi_driver(sbefifo_fsi_driver); diff --git a/drivers/fsi/sbefifo-i2c.c b/drivers/fsi/sbefifo-i2c.c new file mode 100644 index 000000000000..efc526a5947c --- /dev/null +++ b/drivers/fsi/sbefifo-i2c.c @@ -0,0 +1,73 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) IBM Corporation 2022 */ + +#include +#include +#include +#include +#include +#include + +#include "i2cr.h" +#include "sbefifo.h" + +static int sbefifo_i2c_get_devt(struct device *dev, int type, dev_t *devt, int *idx) +{ + struct i2c_client *client = to_i2c_client(dev); + + *idx = client->adapter->nr; + *devt = MKDEV(I2C_MAJOR, (*idx << 7) | client->addr | type); + + return 0; +} + +static int sbefifo_i2c_probe(struct i2c_client *client) +{ + struct regmap_config cfg = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .disable_locking = true, + .cache_type = REGCACHE_NONE, + .val_format_endian = REGMAP_ENDIAN_BIG, + }; + struct regmap *regmap; + struct sbefifo *sbefifo; + + regmap = init_i2cr(client, &cfg); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + sbefifo = sbefifo_create(&client->dev, regmap, sbefifo_i2c_get_devt); + if (IS_ERR(sbefifo)) { + regmap_exit(regmap); + return PTR_ERR(sbefifo); + } + + sbefifo->i2c_client = client; + i2c_set_clientdata(client, sbefifo); + + return 0; +} + +static void sbefifo_i2c_remove(struct i2c_client *client) +{ + sbefifo_destroy(i2c_get_clientdata(client), NULL); +} + +static const struct of_device_id sbefifo_i2c_ids[] = { + { .compatible = "ibm,sbefifo", }, + { } +}; +MODULE_DEVICE_TABLE(of, sbefifo_i2c_ids); + +static struct i2c_driver sbefifo_i2c_driver = { + .probe_new = sbefifo_i2c_probe, + .remove = sbefifo_i2c_remove, + .driver = { + .name = SBEFIFO_DEVICE_NAME, + .of_match_table = sbefifo_i2c_ids, + }, +}; + +module_i2c_driver(sbefifo_i2c_driver); diff --git a/drivers/fsi/sbefifo.c b/drivers/fsi/sbefifo.c index 634405b7aaf4..5743912a1b00 100644 --- a/drivers/fsi/sbefifo.c +++ b/drivers/fsi/sbefifo.c @@ -1,50 +1,19 @@ // SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) IBM Corporation 2017 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERGCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ +/* Copyright (C) IBM Corporation 2022 */ -#include #include -#include #include #include -#include -#include -#include -#include -#include -#include -#include -#include +#include #include -#include -#include +#include #include #include -#include -#include +#include "occ.h" +#include "sbefifo.h" -/* - * The SBEFIFO is a pipe-like FSI device for communicating with - * the self boot engine on POWER processors. - */ - -#define DEVICE_NAME "sbefifo" -#define FSI_ENGID_SBE 0x22 - -/* - * Register layout - */ +#define SBEFIFO_BASE 0x2400 /* Register banks */ #define SBEFIFO_UP 0x00 /* FSI -> Host */ @@ -71,6 +40,16 @@ #define SBEFIFO_EOT_ACK 0x14 /* (Down only) Acknowledge EOT */ #define SBEFIFO_DOWN_MAX 0x18 /* (Down only) Max transfer */ +/* CFAM SCOM ChipID register */ +#define CFAM_SCOM_CHIP_ID 0x1028 /* Converted 0x100a */ +#define CFAM_SCOM_CHIP_ID_CHIP_ID_MASK 0x000FF000 +#define CFAM_SCOM_CHIP_ID_CHIP_ID_SHIFT 12 + +#define CHIP_ID_P9A 0xd1 +#define CHIP_ID_P9B 0xd4 +#define CHIP_ID_P9plus 0xd9 +#define CHIP_ID_P10 0xda + /* CFAM GP Mailbox SelfBoot Message register */ #define CFAM_GP_MBOX_SBM_ADDR 0x2824 /* Converted 0x2809 */ @@ -79,9 +58,8 @@ #define CFAM_SBM_SBE_STATE_MASK 0x00f00000 #define CFAM_SBM_SBE_STATE_SHIFT 20 -enum sbe_state -{ - SBE_STATE_UNKNOWN = 0x0, // Unkown, initial state +enum sbe_state { + SBE_STATE_UNKNOWN = 0x0, // Unknown, initial state SBE_STATE_IPLING = 0x1, // IPL'ing - autonomous mode (transient) SBE_STATE_ISTEP = 0x2, // ISTEP - Running IPL by steps (transient) SBE_STATE_MPIPL = 0x3, // MPIPL @@ -93,7 +71,7 @@ enum sbe_state }; /* FIFO depth */ -#define SBEFIFO_FIFO_DEPTH 8 +#define SBEFIFO_FIFO_DEPTH 8 /* Helpers */ #define sbefifo_empty(sts) ((sts) & SBEFIFO_STS_EMPTY) @@ -109,44 +87,15 @@ enum sbe_state /* Timeouts for commands in ms */ #define SBEFIFO_TIMEOUT_START_CMD 10000 #define SBEFIFO_TIMEOUT_IN_CMD 1000 -#define SBEFIFO_TIMEOUT_START_RSP 10000 #define SBEFIFO_TIMEOUT_IN_RSP 1000 -/* Other constants */ -#define SBEFIFO_MAX_USER_CMD_LEN (0x100000 + PAGE_SIZE) -#define SBEFIFO_RESET_MAGIC 0x52534554 /* "RSET" */ - -struct sbefifo { - uint32_t magic; -#define SBEFIFO_MAGIC 0x53424546 /* "SBEF" */ - struct fsi_device *fsi_dev; - struct device dev; - struct cdev cdev; - struct mutex lock; - bool broken; - bool dead; - bool async_ffdc; - bool timed_out; - u32 timeout_start_rsp_ms; -}; - -struct sbefifo_user { - struct sbefifo *sbefifo; - struct mutex file_lock; - void *cmd_page; - void *pending_cmd; - size_t pending_len; - u32 read_timeout_ms; -}; - static DEFINE_MUTEX(sbefifo_ffdc_mutex); -static ssize_t timeout_show(struct device *dev, struct device_attribute *attr, - char *buf) +static ssize_t timeout_show(struct device *dev, struct device_attribute *attr, char *buf) { struct sbefifo *sbefifo = container_of(dev, struct sbefifo, dev); - return sysfs_emit(buf, "%d\n", sbefifo->timed_out ? 1 : 0); + return sysfs_emit(buf, "%d\n", sbefifo->timed_out); } static DEVICE_ATTR_RO(timeout); @@ -160,10 +109,12 @@ static void __sbefifo_dump_ffdc(struct device *dev, const __be32 *ffdc, while (ffdc_sz) { u32 w0, w1, w2, i; + if (ffdc_sz < 3) { dev_err(dev, "SBE invalid FFDC package size %zd\n", ffdc_sz); return; } + w0 = be32_to_cpu(*(ffdc++)); w1 = be32_to_cpu(*(ffdc++)); w2 = be32_to_cpu(*(ffdc++)); @@ -173,6 +124,7 @@ static void __sbefifo_dump_ffdc(struct device *dev, const __be32 *ffdc, w0, w1, w2); break; } + w0 &= 0xffff; if (w0 > ffdc_sz) { dev_err(dev, "SBE FFDC package len %d words but only %zd remaining\n", @@ -180,6 +132,7 @@ static void __sbefifo_dump_ffdc(struct device *dev, const __be32 *ffdc, w0 = ffdc_sz; break; } + if (internal) { dev_warn(dev, "+---- SBE FFDC package %d for async err -----+\n", pack++); @@ -187,6 +140,7 @@ static void __sbefifo_dump_ffdc(struct device *dev, const __be32 *ffdc, dev_warn(dev, "+---- SBE FFDC package %d for cmd %02x:%02x -----+\n", pack++, (w1 >> 8) & 0xff, w1 & 0xff); } + dev_warn(dev, "| Response code: %08x |\n", w2); dev_warn(dev, "|-------------------------------------------|\n"); for (i = 0; i < w0; i++) { @@ -204,73 +158,29 @@ static void __sbefifo_dump_ffdc(struct device *dev, const __be32 *ffdc, dev_warn(dev, "%s |\n", ffdc_line); } } + dev_warn(dev, "+-------------------------------------------+\n"); } } -static void sbefifo_dump_ffdc(struct device *dev, const __be32 *ffdc, - size_t ffdc_sz, bool internal) +static void sbefifo_dump_ffdc(struct device *dev, const __be32 *ffdc, size_t ffdc_sz, + bool internal) { mutex_lock(&sbefifo_ffdc_mutex); __sbefifo_dump_ffdc(dev, ffdc, ffdc_sz, internal); mutex_unlock(&sbefifo_ffdc_mutex); } -int sbefifo_parse_status(struct device *dev, u16 cmd, __be32 *response, - size_t resp_len, size_t *data_len) -{ - u32 dh, s0, s1; - size_t ffdc_sz; - - if (resp_len < 3) { - pr_debug("sbefifo: cmd %04x, response too small: %zd\n", - cmd, resp_len); - return -ENXIO; - } - dh = be32_to_cpu(response[resp_len - 1]); - if (dh > resp_len || dh < 3) { - dev_err(dev, "SBE cmd %02x:%02x status offset out of range: %d/%zd\n", - cmd >> 8, cmd & 0xff, dh, resp_len); - return -ENXIO; - } - s0 = be32_to_cpu(response[resp_len - dh]); - s1 = be32_to_cpu(response[resp_len - dh + 1]); - if (((s0 >> 16) != 0xC0DE) || ((s0 & 0xffff) != cmd)) { - dev_err(dev, "SBE cmd %02x:%02x, status signature invalid: 0x%08x 0x%08x\n", - cmd >> 8, cmd & 0xff, s0, s1); - return -ENXIO; - } - if (s1 != 0) { - ffdc_sz = dh - 3; - dev_warn(dev, "SBE error cmd %02x:%02x status=%04x:%04x\n", - cmd >> 8, cmd & 0xff, s1 >> 16, s1 & 0xffff); - if (ffdc_sz) - sbefifo_dump_ffdc(dev, &response[resp_len - dh + 2], - ffdc_sz, false); - } - if (data_len) - *data_len = resp_len - dh; - - /* - * Primary status don't have the top bit set, so can't be confused with - * Linux negative error codes, so return the status word whole. - */ - return s1; -} -EXPORT_SYMBOL_GPL(sbefifo_parse_status); - static int sbefifo_regr(struct sbefifo *sbefifo, int reg, u32 *word) { __be32 raw_word; int rc; - rc = fsi_device_read(sbefifo->fsi_dev, reg, &raw_word, - sizeof(raw_word)); + rc = regmap_read(sbefifo->regmap, SBEFIFO_BASE + reg, (unsigned int *)&raw_word); if (rc) return rc; *word = be32_to_cpu(raw_word); - return 0; } @@ -278,8 +188,7 @@ static int sbefifo_regw(struct sbefifo *sbefifo, int reg, u32 word) { __be32 raw_word = cpu_to_be32(word); - return fsi_device_write(sbefifo->fsi_dev, reg, &raw_word, - sizeof(raw_word)); + return regmap_write(sbefifo->regmap, SBEFIFO_BASE + reg, (unsigned int)raw_word); } static int sbefifo_check_sbe_state(struct sbefifo *sbefifo) @@ -288,13 +197,13 @@ static int sbefifo_check_sbe_state(struct sbefifo *sbefifo) u32 sbm; int rc; - rc = fsi_slave_read(sbefifo->fsi_dev->slave, CFAM_GP_MBOX_SBM_ADDR, - &raw_word, sizeof(raw_word)); + rc = regmap_read(sbefifo->regmap, CFAM_GP_MBOX_SBM_ADDR, (unsigned int *)&raw_word); if (rc) return rc; + sbm = be32_to_cpu(raw_word); - /* SBE booted at all ? */ + /* SBE booted at all */ if (!(sbm & CFAM_SBM_SBE_BOOTED)) return -ESHUTDOWN; @@ -317,40 +226,78 @@ static int sbefifo_check_sbe_state(struct sbefifo *sbefifo) /* Is there async FFDC available ? Remember it */ if (sbm & CFAM_SBM_SBE_ASYNC_FFDC) - sbefifo->async_ffdc = true; + sbefifo->async_ffdc = 1; return 0; } -/* Don't flip endianness of data to/from FIFO, just pass through. */ +int sbefifo_parse_status(struct device *dev, u16 cmd, __be32 *response, size_t resp_len, + size_t *data_len) +{ + size_t ffdc_sz; + u32 dh; + u32 s0; + u32 s1; + + if (resp_len < 3) + return -ENXIO; + + dh = be32_to_cpu(response[resp_len - 1]); + if (dh > resp_len || dh < 3) { + dev_err(dev, "SBE cmd %02x:%02x status offset out of range: %d/%zd\n", cmd >> 8, + cmd & 0xff, dh, resp_len); + return -ENXIO; + } + + s0 = be32_to_cpu(response[resp_len - dh]); + s1 = be32_to_cpu(response[resp_len - dh + 1]); + if (((s0 >> 16) != 0xC0DE) || ((s0 & 0xffff) != cmd)) { + dev_err(dev, "SBE cmd %02x:%02x, status signature invalid: 0x%08x 0x%08x\n", + cmd >> 8, cmd & 0xff, s0, s1); + return -ENXIO; + } + + if (s1 != 0) { + ffdc_sz = dh - 3; + dev_warn(dev, "SBE error cmd %02x:%02x status=%04x:%04x\n", cmd >> 8, cmd & 0xff, + s1 >> 16, s1 & 0xffff); + if (ffdc_sz) + sbefifo_dump_ffdc(dev, &response[resp_len - dh + 2], ffdc_sz, false); + } + + if (data_len) + *data_len = resp_len - dh; + + /* + * Primary status don't have the top bit set, so can't be confused with + * Linux negative error codes, so return the status word whole. + */ + return s1; +} +EXPORT_SYMBOL_GPL(sbefifo_parse_status); + static int sbefifo_down_read(struct sbefifo *sbefifo, __be32 *word) { - return fsi_device_read(sbefifo->fsi_dev, SBEFIFO_DOWN, word, - sizeof(*word)); + return regmap_read(sbefifo->regmap, SBEFIFO_BASE + SBEFIFO_DOWN, (unsigned int *)word); } static int sbefifo_up_write(struct sbefifo *sbefifo, __be32 word) { - return fsi_device_write(sbefifo->fsi_dev, SBEFIFO_UP, &word, - sizeof(word)); + return regmap_write(sbefifo->regmap, SBEFIFO_BASE + SBEFIFO_UP, (unsigned int)word); } -static int sbefifo_request_reset(struct sbefifo *sbefifo) +int sbefifo_request_reset(struct sbefifo *sbefifo) { - struct device *dev = &sbefifo->fsi_dev->dev; unsigned long end_time; u32 status; int rc; - dev_dbg(dev, "Requesting FIFO reset\n"); - - /* Mark broken first, will be cleared if reset succeeds */ sbefifo->broken = true; /* Send reset request */ rc = sbefifo_regw(sbefifo, SBEFIFO_UP | SBEFIFO_REQ_RESET, 1); if (rc) { - dev_err(dev, "Sending reset request failed, rc=%d\n", rc); + dev_err(&sbefifo->dev, "Sending reset request failed, rc=%d\n", rc); return rc; } @@ -359,44 +306,40 @@ static int sbefifo_request_reset(struct sbefifo *sbefifo) while (!time_after(jiffies, end_time)) { rc = sbefifo_regr(sbefifo, SBEFIFO_UP | SBEFIFO_STS, &status); if (rc) { - dev_err(dev, "Failed to read UP fifo status during reset" - " , rc=%d\n", rc); + dev_err(&sbefifo->dev, "Failed to read status during reset, rc=%d\n", rc); return rc; } if (!(status & SBEFIFO_STS_RESET_REQ)) { - dev_dbg(dev, "FIFO reset done\n"); sbefifo->broken = false; return 0; } cond_resched(); } - dev_err(dev, "FIFO reset timed out\n"); + dev_err(&sbefifo->dev, "FIFO reset timed out\n"); return -ETIMEDOUT; } static int sbefifo_cleanup_hw(struct sbefifo *sbefifo) { - struct device *dev = &sbefifo->fsi_dev->dev; - u32 up_status, down_status; bool need_reset = false; + u32 down_status; + u32 up_status; int rc; rc = sbefifo_check_sbe_state(sbefifo); - if (rc) { - dev_dbg(dev, "SBE state=%d\n", rc); + if (rc) return rc; - } - /* If broken, we don't need to look at status, go straight to reset */ + /* If broken, we don't need to look at status, just reset */ if (sbefifo->broken) - goto do_reset; + return sbefifo_request_reset(sbefifo); rc = sbefifo_regr(sbefifo, SBEFIFO_UP | SBEFIFO_STS, &up_status); if (rc) { - dev_err(dev, "Cleanup: Reading UP status failed, rc=%d\n", rc); + dev_err(&sbefifo->dev, "Cleanup: Reading UP status failed, rc=%d\n", rc); /* Will try reset again on next attempt at using it */ sbefifo->broken = true; @@ -405,7 +348,7 @@ static int sbefifo_cleanup_hw(struct sbefifo *sbefifo) rc = sbefifo_regr(sbefifo, SBEFIFO_DOWN | SBEFIFO_STS, &down_status); if (rc) { - dev_err(dev, "Cleanup: Reading DOWN status failed, rc=%d\n", rc); + dev_err(&sbefifo->dev, "Cleanup: Reading DOWN status failed, rc=%d\n", rc); /* Will try reset again on next attempt at using it */ sbefifo->broken = true; @@ -414,13 +357,14 @@ static int sbefifo_cleanup_hw(struct sbefifo *sbefifo) /* The FIFO already contains a reset request from the SBE ? */ if (down_status & SBEFIFO_STS_RESET_REQ) { - dev_info(dev, "Cleanup: FIFO reset request set, resetting\n"); + dev_info(&sbefifo->dev, "Cleanup: FIFO reset request set, resetting\n"); rc = sbefifo_regw(sbefifo, SBEFIFO_DOWN, SBEFIFO_PERFORM_RESET); if (rc) { sbefifo->broken = true; - dev_err(dev, "Cleanup: Reset reg write failed, rc=%d\n", rc); + dev_err(&sbefifo->dev, "Cleanup: Reset reg write failed, rc=%d\n", rc); return rc; } + sbefifo->broken = false; return 0; } @@ -436,52 +380,47 @@ static int sbefifo_cleanup_hw(struct sbefifo *sbefifo) if (!need_reset) return 0; - dev_info(dev, "Cleanup: FIFO not clean (up=0x%08x down=0x%08x)\n", - up_status, down_status); - - do_reset: - /* Mark broken, will be cleared if/when reset succeeds */ + dev_info(&sbefifo->dev, "Cleanup: FIFO not clean (up=0x%08x down=0x%08x)\n", up_status, + down_status); return sbefifo_request_reset(sbefifo); } -static int sbefifo_wait(struct sbefifo *sbefifo, bool up, - u32 *status, unsigned long timeout) +static int sbefifo_wait(struct sbefifo *sbefifo, u32 *status, unsigned long timeout, bool up) { - struct device *dev = &sbefifo->fsi_dev->dev; unsigned long end_time; bool ready = false; - u32 addr, sts = 0; + u32 sts = 0; + u32 addr; int rc; - dev_vdbg(dev, "Wait on %s fifo...\n", up ? "up" : "down"); - addr = (up ? SBEFIFO_UP : SBEFIFO_DOWN) | SBEFIFO_STS; - end_time = jiffies + timeout; while (!time_after(jiffies, end_time)) { cond_resched(); rc = sbefifo_regr(sbefifo, addr, &sts); if (rc < 0) { - dev_err(dev, "FSI error %d reading status register\n", rc); + dev_err(&sbefifo->dev, "Bus error %d reading status register\n", rc); return rc; } + if (!up && sbefifo_parity_err(sts)) { - dev_err(dev, "Parity error in DOWN FIFO\n"); + dev_err(&sbefifo->dev, "Parity error in DOWN FIFO\n"); return -ENXIO; } + ready = !(up ? sbefifo_full(sts) : sbefifo_empty(sts)); if (ready) break; } + if (!ready) { sysfs_notify(&sbefifo->dev.kobj, NULL, dev_attr_timeout.attr.name); sbefifo->timed_out = true; - dev_err(dev, "%s FIFO Timeout (%u ms)! status=%08x\n", + dev_err(&sbefifo->dev, "%s FIFO Timeout (%u ms)! status=%08x\n", up ? "UP" : "DOWN", jiffies_to_msecs(timeout), sts); return -ETIMEDOUT; } - dev_vdbg(dev, "End of wait status: %08x\n", sts); sbefifo->timed_out = false; *status = sts; @@ -489,48 +428,45 @@ static int sbefifo_wait(struct sbefifo *sbefifo, bool up, return 0; } -static int sbefifo_send_command(struct sbefifo *sbefifo, - const __be32 *command, size_t cmd_len) +static int sbefifo_send_command(struct sbefifo *sbefifo, const __be32 *command, size_t cmd_len) { - struct device *dev = &sbefifo->fsi_dev->dev; - size_t len, chunk, vacant = 0, remaining = cmd_len; + size_t remaining = cmd_len; unsigned long timeout; + size_t vacant = 0; + size_t chunk; + size_t len; u32 status; int rc; - dev_dbg(dev, "sending command (%zd words, cmd=%04x)\n", - cmd_len, be32_to_cpu(command[1])); - /* As long as there's something to send */ timeout = msecs_to_jiffies(SBEFIFO_TIMEOUT_START_CMD); while (remaining) { /* Wait for room in the FIFO */ - rc = sbefifo_wait(sbefifo, true, &status, timeout); + rc = sbefifo_wait(sbefifo, &status, timeout, true); if (rc < 0) return rc; - timeout = msecs_to_jiffies(SBEFIFO_TIMEOUT_IN_CMD); + timeout = msecs_to_jiffies(SBEFIFO_TIMEOUT_IN_CMD); vacant = sbefifo_vacant(status); - len = chunk = min(vacant, remaining); - - dev_vdbg(dev, " status=%08x vacant=%zd chunk=%zd\n", - status, vacant, chunk); + len = min(vacant, remaining); + chunk = len; /* Write as much as we can */ while (len--) { rc = sbefifo_up_write(sbefifo, *(command++)); if (rc) { - dev_err(dev, "FSI error %d writing UP FIFO\n", rc); + dev_err(&sbefifo->dev, "Bus error %d writing UP FIFO\n", rc); return rc; } } + remaining -= chunk; vacant -= chunk; } /* If there's no room left, wait for some to write EOT */ if (!vacant) { - rc = sbefifo_wait(sbefifo, true, &status, timeout); + rc = sbefifo_wait(sbefifo, &status, timeout, true); if (rc) return rc; } @@ -538,40 +474,36 @@ static int sbefifo_send_command(struct sbefifo *sbefifo, /* Send an EOT */ rc = sbefifo_regw(sbefifo, SBEFIFO_UP | SBEFIFO_EOT_RAISE, 0); if (rc) - dev_err(dev, "FSI error %d writing EOT\n", rc); + dev_err(&sbefifo->dev, "Bus error %d writing EOT\n", rc); + return rc; } static int sbefifo_read_response(struct sbefifo *sbefifo, struct iov_iter *response) { - struct device *dev = &sbefifo->fsi_dev->dev; - u32 status, eot_set; - unsigned long timeout; bool overflow = false; + unsigned long timeout; __be32 data; + u32 eot_set; + u32 status; size_t len; int rc; - dev_dbg(dev, "reading response, buflen = %zd\n", iov_iter_count(response)); - - timeout = msecs_to_jiffies(sbefifo->timeout_start_rsp_ms); + timeout = msecs_to_jiffies(sbefifo->timeout); for (;;) { /* Grab FIFO status (this will handle parity errors) */ - rc = sbefifo_wait(sbefifo, false, &status, timeout); - if (rc < 0) { - dev_dbg(dev, "timeout waiting (%u ms)\n", jiffies_to_msecs(timeout)); + rc = sbefifo_wait(sbefifo, &status, timeout, false); + if (rc < 0) return rc; - } + timeout = msecs_to_jiffies(SBEFIFO_TIMEOUT_IN_RSP); /* Decode status */ len = sbefifo_populated(status); eot_set = sbefifo_eot_set(status); - dev_dbg(dev, " chunk size %zd eot_set=0x%x\n", len, eot_set); - /* Go through the chunk */ - while(len--) { + while (len--) { /* Read the data */ rc = sbefifo_down_read(sbefifo, &data); if (rc < 0) @@ -586,15 +518,13 @@ static int sbefifo_read_response(struct sbefifo *sbefifo, struct iov_iter *respo * command. */ if (len) { - dev_warn(dev, "FIFO read hit" - " EOT with still %zd data\n", - len); + dev_warn(&sbefifo->dev, + "FIFO read hit EOT with still %zd data\n", len); sbefifo->broken = true; } /* We are done */ - rc = sbefifo_regw(sbefifo, - SBEFIFO_DOWN | SBEFIFO_EOT_ACK, 0); + rc = sbefifo_regw(sbefifo, SBEFIFO_DOWN | SBEFIFO_EOT_ACK, 0); /* * If that write fail, still complete the request but mark @@ -602,7 +532,7 @@ static int sbefifo_read_response(struct sbefifo *sbefifo, struct iov_iter *respo * we can do here). */ if (rc) { - dev_err(dev, "FSI error %d ack'ing EOT\n", rc); + dev_err(&sbefifo->dev, "Bus error %d ack'ing EOT\n", rc); sbefifo->broken = true; } @@ -615,7 +545,7 @@ static int sbefifo_read_response(struct sbefifo *sbefifo, struct iov_iter *respo if (copy_to_iter(&data, sizeof(__be32), response) < sizeof(__be32)) return -EFAULT; } else { - dev_vdbg(dev, "Response overflowed !\n"); + dev_warn(&sbefifo->dev, "Response overflowed !\n"); overflow = true; } @@ -624,16 +554,18 @@ static int sbefifo_read_response(struct sbefifo *sbefifo, struct iov_iter *respo eot_set <<= 1; } } + /* Shouldn't happen */ return -EIO; } -static int sbefifo_do_command(struct sbefifo *sbefifo, - const __be32 *command, size_t cmd_len, +static int sbefifo_do_command(struct sbefifo *sbefifo, const __be32 *command, size_t cmd_len, struct iov_iter *response) { + int rc; + /* Try sending the command */ - int rc = sbefifo_send_command(sbefifo, command, cmd_len); + rc = sbefifo_send_command(sbefifo, command, cmd_len); if (rc) return rc; @@ -643,58 +575,56 @@ static int sbefifo_do_command(struct sbefifo *sbefifo, static void sbefifo_collect_async_ffdc(struct sbefifo *sbefifo) { - struct device *dev = &sbefifo->fsi_dev->dev; - struct iov_iter ffdc_iter; - struct kvec ffdc_iov; - __be32 *ffdc; + struct iov_iter ffdc_iter; + struct kvec ffdc_iov; size_t ffdc_sz; __be32 cmd[2]; + __be32 *ffdc; int rc; sbefifo->async_ffdc = false; ffdc = vmalloc(SBEFIFO_MAX_FFDC_SIZE); if (!ffdc) { - dev_err(dev, "Failed to allocate SBE FFDC buffer\n"); + dev_err(&sbefifo->dev, "Failed to allocate SBE FFDC buffer\n"); return; } - ffdc_iov.iov_base = ffdc; + + ffdc_iov.iov_base = ffdc; ffdc_iov.iov_len = SBEFIFO_MAX_FFDC_SIZE; - iov_iter_kvec(&ffdc_iter, WRITE, &ffdc_iov, 1, SBEFIFO_MAX_FFDC_SIZE); + iov_iter_kvec(&ffdc_iter, WRITE, &ffdc_iov, 1, SBEFIFO_MAX_FFDC_SIZE); cmd[0] = cpu_to_be32(2); cmd[1] = cpu_to_be32(SBEFIFO_CMD_GET_SBE_FFDC); rc = sbefifo_do_command(sbefifo, cmd, 2, &ffdc_iter); if (rc != 0) { - dev_err(dev, "Error %d retrieving SBE FFDC\n", rc); - goto bail; + dev_err(&sbefifo->dev, "Error %d retrieving SBE FFDC\n", rc); + goto done; } ffdc_sz = SBEFIFO_MAX_FFDC_SIZE - iov_iter_count(&ffdc_iter); ffdc_sz /= sizeof(__be32); - rc = sbefifo_parse_status(dev, SBEFIFO_CMD_GET_SBE_FFDC, ffdc, - ffdc_sz, &ffdc_sz); + rc = sbefifo_parse_status(&sbefifo->dev, SBEFIFO_CMD_GET_SBE_FFDC, ffdc, ffdc_sz, + &ffdc_sz); if (rc != 0) { - dev_err(dev, "Error %d decoding SBE FFDC\n", rc); - goto bail; + dev_err(&sbefifo->dev, "Error %d decoding SBE FFDC\n", rc); + goto done; } + if (ffdc_sz > 0) - sbefifo_dump_ffdc(dev, ffdc, ffdc_sz, true); - bail: + sbefifo_dump_ffdc(&sbefifo->dev, ffdc, ffdc_sz, true); +done: vfree(ffdc); - } -static int __sbefifo_submit(struct sbefifo *sbefifo, - const __be32 *command, size_t cmd_len, +int sbefifo_submit_internal(struct sbefifo *sbefifo, const __be32 *command, size_t words, struct iov_iter *response) { - struct device *dev = &sbefifo->fsi_dev->dev; int rc; if (sbefifo->dead) return -ENODEV; - if (cmd_len < 2 || be32_to_cpu(command[0]) != cmd_len) { - dev_vdbg(dev, "Invalid command len %zd (header: %d)\n", - cmd_len, be32_to_cpu(command[0])); + if (words < 2 || be32_to_cpu(command[0]) != words) { + dev_warn(&sbefifo->dev, "Invalid command len %zd (header: %u)\n", words, + be32_to_cpu(command[0])); return -EINVAL; } @@ -707,18 +637,15 @@ static int __sbefifo_submit(struct sbefifo *sbefifo, if (sbefifo->async_ffdc) sbefifo_collect_async_ffdc(sbefifo); - rc = sbefifo_do_command(sbefifo, command, cmd_len, response); - if (rc != 0 && rc != -EOVERFLOW) - goto fail; - return rc; - fail: + rc = sbefifo_do_command(sbefifo, command, words, response); + /* * On failure, attempt a reset. Ignore the result, it will mark * the fifo broken if the reset fails */ - sbefifo_request_reset(sbefifo); + if (rc != 0 && rc != -EOVERFLOW) + sbefifo_request_reset(sbefifo); - /* Return original error */ return rc; } @@ -730,39 +657,34 @@ static int __sbefifo_submit(struct sbefifo *sbefifo, * @response: The output response buffer * @resp_len: In: Response buffer size, Out: Response size * - * This will perform the entire operation. If the reponse buffer + * This will perform the entire operation. If the response buffer * overflows, returns -EOVERFLOW */ int sbefifo_submit(struct device *dev, const __be32 *command, size_t cmd_len, __be32 *response, size_t *resp_len) { struct sbefifo *sbefifo; - struct iov_iter resp_iter; - struct kvec resp_iov; + struct iov_iter resp_iter; + struct kvec resp_iov; size_t rbytes; int rc; - if (!dev) - return -ENODEV; - sbefifo = dev_get_drvdata(dev); - if (!sbefifo) - return -ENODEV; - if (WARN_ON_ONCE(sbefifo->magic != SBEFIFO_MAGIC)) - return -ENODEV; if (!resp_len || !command || !response) return -EINVAL; + sbefifo = container_of(dev, struct sbefifo, dev); + /* Prepare iov iterator */ rbytes = (*resp_len) * sizeof(__be32); resp_iov.iov_base = response; resp_iov.iov_len = rbytes; - iov_iter_kvec(&resp_iter, WRITE, &resp_iov, 1, rbytes); + iov_iter_kvec(&resp_iter, WRITE, &resp_iov, 1, rbytes); /* Perform the command */ rc = mutex_lock_interruptible(&sbefifo->lock); if (rc) return rc; - rc = __sbefifo_submit(sbefifo, command, cmd_len, &resp_iter); + rc = sbefifo_submit_internal(sbefifo, command, cmd_len, &resp_iter); mutex_unlock(&sbefifo->lock); /* Extract the response length */ @@ -777,153 +699,99 @@ static void sbefifo_free(struct device *dev) { struct sbefifo *sbefifo = container_of(dev, struct sbefifo, dev); - put_device(&sbefifo->fsi_dev->dev); + put_device(dev->parent); kfree(sbefifo); } -/* - * Probe/remove - */ - -static int sbefifo_probe(struct device *dev) +struct sbefifo *sbefifo_create(struct device *parent, struct regmap *regmap, + int (*get_devt)(struct device *, int, dev_t *, int *)) { - struct fsi_device *fsi_dev = to_fsi_dev(dev); struct sbefifo *sbefifo; - struct device_node *np; - struct platform_device *child; - char child_name[32]; - int rc, didx, child_idx = 0; + __be32 raw_word; + u32 chip_id; + int idx; + int rc; - dev_dbg(dev, "Found sbefifo device\n"); + if (!get_device(parent)) + return ERR_PTR(-ENODEV); sbefifo = kzalloc(sizeof(*sbefifo), GFP_KERNEL); - if (!sbefifo) - return -ENOMEM; + if (!sbefifo) { + put_device(parent); + return ERR_PTR(-ENOMEM); + } - /* Grab a reference to the device (parent of our cdev), we'll drop it later */ - if (!get_device(dev)) { + rc = get_devt(parent, (int)fsi_dev_sbefifo, &sbefifo->dev.devt, &idx); + if (rc) { kfree(sbefifo); - return -ENODEV; + put_device(parent); + return ERR_PTR(rc); } - sbefifo->magic = SBEFIFO_MAGIC; - sbefifo->fsi_dev = fsi_dev; - dev_set_drvdata(dev, sbefifo); - mutex_init(&sbefifo->lock); - sbefifo->timeout_start_rsp_ms = SBEFIFO_TIMEOUT_START_RSP; - - /* - * Try cleaning up the FIFO. If this fails, we still register the - * driver and will try cleaning things up again on the next access. - */ - rc = sbefifo_cleanup_hw(sbefifo); - if (rc && rc != -ESHUTDOWN) - dev_err(dev, "Initial HW cleanup failed, will retry later\n"); - - /* Create chardev for userspace access */ sbefifo->dev.type = &fsi_cdev_type; - sbefifo->dev.parent = dev; + sbefifo->dev.parent = parent; sbefifo->dev.release = sbefifo_free; device_initialize(&sbefifo->dev); + dev_set_name(&sbefifo->dev, "sbefifo%d", idx); + + sbefifo_cdev_init(sbefifo); + + mutex_init(&sbefifo->lock); - /* Allocate a minor in the FSI space */ - rc = fsi_get_new_minor(fsi_dev, fsi_dev_sbefifo, &sbefifo->dev.devt, &didx); + rc = regmap_read(regmap, CFAM_SCOM_CHIP_ID, (unsigned int *)&raw_word); if (rc) - goto err; + return ERR_PTR(rc); - dev_set_name(&sbefifo->dev, "sbefifo%d", didx); - cdev_init(&sbefifo->cdev, &sbefifo_fops); - rc = cdev_device_add(&sbefifo->cdev, &sbefifo->dev); - if (rc) { - dev_err(dev, "Error %d creating char device %s\n", - rc, dev_name(&sbefifo->dev)); - goto err_free_minor; - } + chip_id = be32_to_cpu(raw_word); + chip_id = (chip_id & CFAM_SCOM_CHIP_ID_CHIP_ID_MASK) >> CFAM_SCOM_CHIP_ID_CHIP_ID_SHIFT; - /* Create platform devs for dts child nodes (occ, etc) */ - for_each_available_child_of_node(dev->of_node, np) { - snprintf(child_name, sizeof(child_name), "%s-dev%d", - dev_name(&sbefifo->dev), child_idx++); - child = of_platform_device_create(np, child_name, dev); - if (!child) - dev_warn(dev, "failed to create child %s dev\n", - child_name); + switch (chip_id) { + case CHIP_ID_P9A: + case CHIP_ID_P9B: + case CHIP_ID_P9plus: + sbefifo->occ = occ_create(sbefifo, get_devt, occ_p9); + break; + case CHIP_ID_P10: + sbefifo->occ = occ_create(sbefifo, get_devt, occ_p10); + break; } - device_create_file(&sbefifo->dev, &dev_attr_timeout); + sbefifo->regmap = regmap; + sbefifo->timeout = SBEFIFO_TIMEOUT_START_RSP; - return 0; - err_free_minor: - fsi_free_minor(sbefifo->dev.devt); - err: - put_device(&sbefifo->dev); - return rc; -} + if (device_create_file(&sbefifo->dev, &dev_attr_timeout)) + sbefifo->no_timeout_sysfs = 1; -static int sbefifo_unregister_child(struct device *dev, void *data) -{ - struct platform_device *child = to_platform_device(dev); - - of_device_unregister(child); - if (dev->of_node) - of_node_clear_flag(dev->of_node, OF_POPULATED); + rc = sbefifo_cleanup_hw(sbefifo); + if (rc && rc != -ESHUTDOWN) + dev_err(&sbefifo->dev, "Initial HW cleanup failed, will retry later\n"); - return 0; + return sbefifo; } -static int sbefifo_remove(struct device *dev) +void sbefifo_destroy(struct sbefifo *sbefifo, void(*free_devt)(dev_t)) { - struct sbefifo *sbefifo = dev_get_drvdata(dev); - - dev_dbg(dev, "Removing sbefifo device...\n"); - - device_remove_file(&sbefifo->dev, &dev_attr_timeout); - mutex_lock(&sbefifo->lock); - sbefifo->dead = true; + sbefifo->dead = 1; mutex_unlock(&sbefifo->lock); - cdev_device_del(&sbefifo->cdev, &sbefifo->dev); - fsi_free_minor(sbefifo->dev.devt); - device_for_each_child(dev, NULL, sbefifo_unregister_child); - put_device(&sbefifo->dev); + if (free_devt) + free_devt(sbefifo->dev.devt); - return 0; -} + if (!sbefifo->no_timeout_sysfs) + device_remove_file(&sbefifo->dev, &dev_attr_timeout); -static const struct fsi_device_id sbefifo_ids[] = { - { - .engine_type = FSI_ENGID_SBE, - .version = FSI_VERSION_ANY, - }, - { 0 } -}; + regmap_exit(sbefifo->regmap); -static struct fsi_driver sbefifo_drv = { - .id_table = sbefifo_ids, - .drv = { - .name = DEVICE_NAME, - .bus = &fsi_bus_type, - .probe = sbefifo_probe, - .remove = sbefifo_remove, - } -}; + if (sbefifo->occ) + occ_destroy(sbefifo->occ, free_devt); -static int sbefifo_init(void) -{ - return fsi_driver_register(&sbefifo_drv); -} + if (!sbefifo->no_cdev) + cdev_device_del(&sbefifo->sbe, &sbefifo->dev); -static void sbefifo_exit(void) -{ - fsi_driver_unregister(&sbefifo_drv); + put_device(&sbefifo->dev); } -module_init(sbefifo_init); -module_exit(sbefifo_exit); +MODULE_AUTHOR("Eddie James "); +MODULE_DESCRIPTION("POWER Self Boot Engine FIFO driver"); MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Brad Bishop "); -MODULE_AUTHOR("Eddie James "); -MODULE_AUTHOR("Andrew Jeffery "); -MODULE_AUTHOR("Benjamin Herrenschmidt "); -MODULE_DESCRIPTION("Linux device interface to the POWER Self Boot Engine"); diff --git a/drivers/fsi/sbefifo.h b/drivers/fsi/sbefifo.h new file mode 100644 index 000000000000..23f342d712bd --- /dev/null +++ b/drivers/fsi/sbefifo.h @@ -0,0 +1,50 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* Copyright (C) IBM Corporation 2022 */ + +#ifndef DRIVERS_SBEFIFO_H +#define DRIVERS_SBEFIFO_H + +#include +#include +#include +#include + +#define SBEFIFO_DEVICE_NAME "sbefifo" +#define SBEFIFO_MAX_USER_CMD_LEN (0x100000 + PAGE_SIZE) +#define SBEFIFO_RESET_MAGIC 0x52534554 /* "RSET" */ +#define SBEFIFO_TIMEOUT_START_RSP 10000 + +struct fsi_device; +struct i2c_client; +struct iov_iter; +struct occ; +struct regmap; + +struct sbefifo { + struct device dev; + struct cdev sbe; + struct mutex lock; // device lock + union { + struct fsi_device *fsi_dev; + struct i2c_client *i2c_client; + }; + struct occ *occ; + struct regmap *regmap; + unsigned int timeout; + unsigned int async_ffdc : 1; + unsigned int broken : 1; + unsigned int dead : 1; + unsigned int no_cdev : 1; + unsigned int no_timeout_sysfs : 1; + unsigned int timed_out : 1; +}; + +void sbefifo_cdev_init(struct sbefifo *sbefifo); +struct sbefifo *sbefifo_create(struct device *parent, struct regmap *regmap, + int (*get_devt)(struct device *, int, dev_t *, int *)); +void sbefifo_destroy(struct sbefifo *sbefifo, void(*free_devt)(dev_t)); +int sbefifo_request_reset(struct sbefifo *sbefifo); +int sbefifo_submit_internal(struct sbefifo *sbefifo, const __be32 *command, size_t words, + struct iov_iter *response); + +#endif /* DRIVERS_SBEFIFO_H */