Microsemi's "Switchtec" line of PCI switch devices is already well supported by the kernel with standard PCI switch drivers. However, the Switchtec device advertises a special management endpoint with a separate PCI function address and class code. This endpoint enables some additional functionality which includes: * Packet and Byte Counters * Switch Firmware Upgrades * Event and Error logs * Querying port link status * Custom user firmware commands This patch introduces the switchtec kernel module which provides PCI driver that exposes a char device. The char device provides userspace access to this interface through read, write and (optionally) poll calls. A userspace tool and library which utilizes this interface is available at [1]. This tool takes inspiration (and borrows some code) from nvme-cli [2]. The tool is largely complete at this time but additional features may be added in the future. [1] https://github.com/sbates130272/switchtec-user [2] https://github.com/linux-nvme/nvme-cli Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx> Signed-off-by: Stephen Bates <stephen.bates@xxxxxxxxxxxxx> Tested-by: Krishna Dhulipala <krishnad@xxxxxx> Reviewed-by: Wei Zhang <wzhang@xxxxxx> Reviewed-by: Jens Axboe <axboe@xxxxxx> Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- MAINTAINERS | 8 + drivers/pci/Kconfig | 1 + drivers/pci/Makefile | 1 + drivers/pci/switch/Kconfig | 13 + drivers/pci/switch/Makefile | 1 + drivers/pci/switch/switchtec.c | 1006 ++++++++++++++++++++++++++++++++++++++++ 6 files changed, 1030 insertions(+) create mode 100644 drivers/pci/switch/Kconfig create mode 100644 drivers/pci/switch/Makefile create mode 100644 drivers/pci/switch/switchtec.c diff --git a/MAINTAINERS b/MAINTAINERS index 527d137..a57686f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -9506,6 +9506,14 @@ S: Maintained F: Documentation/devicetree/bindings/pci/aardvark-pci.txt F: drivers/pci/host/pci-aardvark.c +PCI DRIVER FOR MICROSEMI SWITCHTEC +M: Kurt Schwemmer <kurt.schwemmer@xxxxxxxxxxxxx> +M: Stephen Bates <stephen.bates@xxxxxxxxxxxxx> +M: Logan Gunthorpe <logang@xxxxxxxxxxxx> +L: linux-pci@xxxxxxxxxxxxxxx +S: Maintained +F: drivers/pci/switch/switchtec* + PCI DRIVER FOR NVIDIA TEGRA M: Thierry Reding <thierry.reding@xxxxxxxxx> L: linux-tegra@xxxxxxxxxxxxxxx diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index 6555eb7..f72e8c5 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -133,3 +133,4 @@ config PCI_HYPERV source "drivers/pci/hotplug/Kconfig" source "drivers/pci/host/Kconfig" +source "drivers/pci/switch/Kconfig" diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile index 8db5079..15b46dd 100644 --- a/drivers/pci/Makefile +++ b/drivers/pci/Makefile @@ -68,3 +68,4 @@ ccflags-$(CONFIG_PCI_DEBUG) := -DDEBUG # PCI host controller drivers obj-y += host/ +obj-y += switch/ diff --git a/drivers/pci/switch/Kconfig b/drivers/pci/switch/Kconfig new file mode 100644 index 0000000..4c49648 --- /dev/null +++ b/drivers/pci/switch/Kconfig @@ -0,0 +1,13 @@ +menu "PCI switch controller drivers" + depends on PCI + +config PCI_SW_SWITCHTEC + tristate "MicroSemi Switchtec PCIe Switch Management Driver" + help + Enables support for the management interface for the MicroSemi + Switchtec series of PCIe switches. Supports userspace access + to submit MRPC commands to the switch via /dev/switchtecX + devices. See <file:Documentation/switchtec.txt> for more + information. + +endmenu diff --git a/drivers/pci/switch/Makefile b/drivers/pci/switch/Makefile new file mode 100644 index 0000000..37d8cfb --- /dev/null +++ b/drivers/pci/switch/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_PCI_SW_SWITCHTEC) += switchtec.o diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c new file mode 100644 index 0000000..084e4ed --- /dev/null +++ b/drivers/pci/switch/switchtec.c @@ -0,0 +1,1006 @@ +/* + * Microsemi Switchtec(tm) PCIe Management Driver + * Copyright (c) 2017, Microsemi Corporation + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + */ + +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/uaccess.h> +#include <linux/poll.h> +#include <linux/pci.h> +#include <linux/cdev.h> +#include <linux/wait.h> + +MODULE_DESCRIPTION("Microsemi Switchtec(tm) PCIe Management Driver"); +MODULE_VERSION("0.1"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Microsemi Corporation"); + +static int max_devices = 16; +module_param(max_devices, int, 0644); +MODULE_PARM_DESC(max_devices, "max number of switchtec device instances"); + +static dev_t switchtec_devt; +static struct class *switchtec_class; +static DEFINE_IDA(switchtec_minor_ida); + +#define MICROSEMI_VENDOR_ID 0x11f8 +#define MICROSEMI_NTB_CLASSCODE 0x068000 +#define MICROSEMI_MGMT_CLASSCODE 0x058000 + +#define SWITCHTEC_MRPC_PAYLOAD_SIZE 1024 +#define SWITCHTEC_MAX_PFF_CSR 48 + +#define SWITCHTEC_EVENT_OCCURRED BIT(0) +#define SWITCHTEC_EVENT_CLEAR BIT(0) +#define SWITCHTEC_EVENT_EN_LOG BIT(1) +#define SWITCHTEC_EVENT_EN_CLI BIT(2) +#define SWITCHTEC_EVENT_EN_IRQ BIT(3) +#define SWITCHTEC_EVENT_FATAL BIT(4) + +enum { + SWITCHTEC_GAS_MRPC_OFFSET = 0x0000, + SWITCHTEC_GAS_TOP_CFG_OFFSET = 0x1000, + SWITCHTEC_GAS_SW_EVENT_OFFSET = 0x1800, + SWITCHTEC_GAS_SYS_INFO_OFFSET = 0x2000, + SWITCHTEC_GAS_FLASH_INFO_OFFSET = 0x2200, + SWITCHTEC_GAS_PART_CFG_OFFSET = 0x4000, + SWITCHTEC_GAS_NTB_OFFSET = 0x10000, + SWITCHTEC_GAS_PFF_CSR_OFFSET = 0x134000, +}; + +struct mrpc_regs { + u8 input_data[SWITCHTEC_MRPC_PAYLOAD_SIZE]; + u8 output_data[SWITCHTEC_MRPC_PAYLOAD_SIZE]; + u32 cmd; + u32 status; + u32 ret_value; +} __packed; + +enum mrpc_status { + SWITCHTEC_MRPC_STATUS_INPROGRESS = 1, + SWITCHTEC_MRPC_STATUS_DONE = 2, + SWITCHTEC_MRPC_STATUS_ERROR = 0xFF, + SWITCHTEC_MRPC_STATUS_INTERRUPTED = 0x100, +}; + +struct sw_event_regs { + u64 event_report_ctrl; + u64 reserved1; + u64 part_event_bitmap; + u64 reserved2; + u32 global_summary; + u32 reserved3[3]; + u32 stack_error_event_hdr; + u32 stack_error_event_data; + u32 reserved4[4]; + u32 ppu_error_event_hdr; + u32 ppu_error_event_data; + u32 reserved5[4]; + u32 isp_error_event_hdr; + u32 isp_error_event_data; + u32 reserved6[4]; + u32 sys_reset_event_hdr; + u32 reserved7[5]; + u32 fw_exception_hdr; + u32 reserved8[5]; + u32 fw_nmi_hdr; + u32 reserved9[5]; + u32 fw_non_fatal_hdr; + u32 reserved10[5]; + u32 fw_fatal_hdr; + u32 reserved11[5]; + u32 twi_mrpc_comp_hdr; + u32 twi_mrpc_comp_data; + u32 reserved12[4]; + u32 twi_mrpc_comp_async_hdr; + u32 twi_mrpc_comp_async_data; + u32 reserved13[4]; + u32 cli_mrpc_comp_hdr; + u32 cli_mrpc_comp_data; + u32 reserved14[4]; + u32 cli_mrpc_comp_async_hdr; + u32 cli_mrpc_comp_async_data; + u32 reserved15[4]; + u32 gpio_interrupt_hdr; + u32 gpio_interrupt_data; + u32 reserved16[4]; +} __packed; + +struct sys_info_regs { + u32 device_id; + u32 device_version; + u32 firmware_version; + u32 reserved1; + u32 vendor_table_revision; + u32 table_format_version; + u32 partition_id; + u32 cfg_file_fmt_version; + u32 reserved2[58]; + char vendor_id[8]; + char product_id[16]; + char product_revision[4]; + char component_vendor[8]; + u16 component_id; + u8 component_revision; +} __packed; + +struct flash_info_regs { + u32 flash_part_map_upd_idx; + + struct active_partition_info { + u32 address; + u32 build_version; + u32 build_string; + } active_img; + + struct active_partition_info active_cfg; + struct active_partition_info inactive_img; + struct active_partition_info inactive_cfg; + + u32 flash_length; + + struct partition_info { + u32 address; + u32 length; + } cfg0; + + struct partition_info cfg1; + struct partition_info img0; + struct partition_info img1; + struct partition_info nvlog; + struct partition_info vendor[8]; +}; + +struct ntb_info_regs { + u8 partition_count; + u8 partition_id; + u16 reserved1; + u64 ep_map; + u16 requester_id; +} __packed; + +struct part_cfg_regs { + u32 status; + u32 state; + u32 port_cnt; + u32 usp_port_mode; + u32 usp_pff_inst_id; + u32 vep_pff_inst_id; + u32 dsp_pff_inst_id[47]; + u32 reserved1[11]; + u16 vep_vector_number; + u16 usp_vector_number; + u32 port_event_bitmap; + u32 reserved2[3]; + u32 part_event_summary; + u32 reserved3[3]; + u32 part_reset_hdr; + u32 part_reset_data[5]; + u32 mrpc_comp_hdr; + u32 mrpc_comp_data[5]; + u32 mrpc_comp_async_hdr; + u32 mrpc_comp_async_data[5]; + u32 dyn_binding_hdr; + u32 dyn_binding_data[5]; + u32 reserved4[159]; +} __packed; + +enum { + SWITCHTEC_PART_CFG_EVENT_RESET = 1 << 0, + SWITCHTEC_PART_CFG_EVENT_MRPC_CMP = 1 << 1, + SWITCHTEC_PART_CFG_EVENT_MRPC_ASYNC_CMP = 1 << 2, + SWITCHTEC_PART_CFG_EVENT_DYN_PART_CMP = 1 << 3, +}; + +struct pff_csr_regs { + u16 vendor_id; + u16 device_id; + u32 pci_cfg_header[15]; + u32 pci_cap_region[48]; + u32 pcie_cap_region[448]; + u32 indirect_gas_window[128]; + u32 indirect_gas_window_off; + u32 reserved[127]; + u32 pff_event_summary; + u32 reserved2[3]; + u32 aer_in_p2p_hdr; + u32 aer_in_p2p_data[5]; + u32 aer_in_vep_hdr; + u32 aer_in_vep_data[5]; + u32 dpc_hdr; + u32 dpc_data[5]; + u32 cts_hdr; + u32 cts_data[5]; + u32 reserved3[6]; + u32 hotplug_hdr; + u32 hotplug_data[5]; + u32 ier_hdr; + u32 ier_data[5]; + u32 threshold_hdr; + u32 threshold_data[5]; + u32 power_mgmt_hdr; + u32 power_mgmt_data[5]; + u32 tlp_throttling_hdr; + u32 tlp_throttling_data[5]; + u32 force_speed_hdr; + u32 force_speed_data[5]; + u32 credit_timeout_hdr; + u32 credit_timeout_data[5]; + u32 link_state_hdr; + u32 link_state_data[5]; + u32 reserved4[174]; +} __packed; + +struct switchtec_dev { + struct pci_dev *pdev; + struct device dev; + struct cdev cdev; + + int partition; + int partition_count; + int pff_csr_count; + char pff_local[SWITCHTEC_MAX_PFF_CSR]; + + void __iomem *mmio; + struct mrpc_regs __iomem *mmio_mrpc; + struct sw_event_regs __iomem *mmio_sw_event; + struct sys_info_regs __iomem *mmio_sys_info; + struct flash_info_regs __iomem *mmio_flash_info; + struct ntb_info_regs __iomem *mmio_ntb; + struct part_cfg_regs __iomem *mmio_part_cfg; + struct part_cfg_regs __iomem *mmio_part_cfg_all; + struct pff_csr_regs __iomem *mmio_pff_csr; + + /* + * The mrpc mutex must be held when accessing the other + * mrpc_ fields, alive flag and stuser->state field + */ + struct mutex mrpc_mutex; + struct list_head mrpc_queue; + int mrpc_busy; + struct work_struct mrpc_work; + struct delayed_work mrpc_timeout; + bool alive; + + wait_queue_head_t event_wq; + atomic_t event_cnt; +}; + +static struct switchtec_dev *to_stdev(struct device *dev) +{ + return container_of(dev, struct switchtec_dev, dev); +} + +enum mrpc_state { + MRPC_IDLE = 0, + MRPC_QUEUED, + MRPC_RUNNING, + MRPC_DONE, +}; + +struct switchtec_user { + struct switchtec_dev *stdev; + + enum mrpc_state state; + + struct completion comp; + struct kref kref; + struct list_head list; + + u32 cmd; + u32 status; + u32 return_code; + size_t data_len; + size_t read_len; + unsigned char data[SWITCHTEC_MRPC_PAYLOAD_SIZE]; + int event_cnt; +}; + +static struct switchtec_user *stuser_create(struct switchtec_dev *stdev) +{ + struct switchtec_user *stuser; + + stuser = kzalloc(sizeof(*stuser), GFP_KERNEL); + if (!stuser) + return ERR_PTR(-ENOMEM); + + get_device(&stdev->dev); + stuser->stdev = stdev; + kref_init(&stuser->kref); + INIT_LIST_HEAD(&stuser->list); + init_completion(&stuser->comp); + stuser->event_cnt = atomic_read(&stdev->event_cnt); + + dev_dbg(&stdev->dev, "%s: %p\n", __func__, stuser); + + return stuser; +} + +static void stuser_free(struct kref *kref) +{ + struct switchtec_user *stuser; + + stuser = container_of(kref, struct switchtec_user, kref); + + dev_dbg(&stuser->stdev->dev, "%s: %p\n", __func__, stuser); + + put_device(&stuser->stdev->dev); + kfree(stuser); +} + +static void stuser_put(struct switchtec_user *stuser) +{ + kref_put(&stuser->kref, stuser_free); +} + +static void stuser_set_state(struct switchtec_user *stuser, + enum mrpc_state state) +{ + /* requires the mrpc_mutex to already be held when called */ + + const char * const state_names[] = { + [MRPC_IDLE] = "IDLE", + [MRPC_QUEUED] = "QUEUED", + [MRPC_RUNNING] = "RUNNING", + [MRPC_DONE] = "DONE", + }; + + stuser->state = state; + + dev_dbg(&stuser->stdev->dev, "stuser state %p -> %s", + stuser, state_names[state]); +} + +static void mrpc_complete_cmd(struct switchtec_dev *stdev); + +static void mrpc_cmd_submit(struct switchtec_dev *stdev) +{ + /* requires the mrpc_mutex to already be held when called */ + + struct switchtec_user *stuser; + + if (stdev->mrpc_busy) + return; + + if (list_empty(&stdev->mrpc_queue)) + return; + + stuser = list_entry(stdev->mrpc_queue.next, struct switchtec_user, + list); + + stuser_set_state(stuser, MRPC_RUNNING); + stdev->mrpc_busy = 1; + memcpy_toio(&stdev->mmio_mrpc->input_data, + stuser->data, stuser->data_len); + iowrite32(stuser->cmd, &stdev->mmio_mrpc->cmd); + + stuser->status = ioread32(&stdev->mmio_mrpc->status); + if (stuser->status != SWITCHTEC_MRPC_STATUS_INPROGRESS) + mrpc_complete_cmd(stdev); + + schedule_delayed_work(&stdev->mrpc_timeout, + msecs_to_jiffies(500)); +} + +static int mrpc_queue_cmd(struct switchtec_user *stuser) +{ + /* requires the mrpc_mutex to already be held when called */ + + struct switchtec_dev *stdev = stuser->stdev; + + kref_get(&stuser->kref); + stuser->read_len = sizeof(stuser->data); + stuser_set_state(stuser, MRPC_QUEUED); + init_completion(&stuser->comp); + list_add_tail(&stuser->list, &stdev->mrpc_queue); + + mrpc_cmd_submit(stdev); + + return 0; +} + +static void mrpc_complete_cmd(struct switchtec_dev *stdev) +{ + /* requires the mrpc_mutex to already be held when called */ + struct switchtec_user *stuser; + + if (list_empty(&stdev->mrpc_queue)) + return; + + stuser = list_entry(stdev->mrpc_queue.next, struct switchtec_user, + list); + + stuser->status = ioread32(&stdev->mmio_mrpc->status); + if (stuser->status == SWITCHTEC_MRPC_STATUS_INPROGRESS) + return; + + stuser_set_state(stuser, MRPC_DONE); + stuser->return_code = 0; + + if (stuser->status != SWITCHTEC_MRPC_STATUS_DONE) + goto out; + + stuser->return_code = ioread32(&stdev->mmio_mrpc->ret_value); + if (stuser->return_code != 0) + goto out; + + memcpy_fromio(stuser->data, &stdev->mmio_mrpc->output_data, + stuser->read_len); + +out: + complete_all(&stuser->comp); + list_del_init(&stuser->list); + stuser_put(stuser); + stdev->mrpc_busy = 0; + + mrpc_cmd_submit(stdev); +} + +static void mrpc_event_work(struct work_struct *work) +{ + struct switchtec_dev *stdev; + + stdev = container_of(work, struct switchtec_dev, mrpc_work); + + dev_dbg(&stdev->dev, "%s\n", __func__); + + mutex_lock(&stdev->mrpc_mutex); + cancel_delayed_work(&stdev->mrpc_timeout); + mrpc_complete_cmd(stdev); + mutex_unlock(&stdev->mrpc_mutex); +} + +static void mrpc_timeout_work(struct work_struct *work) +{ + struct switchtec_dev *stdev; + u32 status; + + stdev = container_of(work, struct switchtec_dev, mrpc_timeout.work); + + dev_dbg(&stdev->dev, "%s\n", __func__); + + mutex_lock(&stdev->mrpc_mutex); + + status = ioread32(&stdev->mmio_mrpc->status); + if (status == SWITCHTEC_MRPC_STATUS_INPROGRESS) { + schedule_delayed_work(&stdev->mrpc_timeout, + msecs_to_jiffies(500)); + goto out; + } + + mrpc_complete_cmd(stdev); + +out: + mutex_unlock(&stdev->mrpc_mutex); +} + +static int switchtec_dev_open(struct inode *inode, struct file *filp) +{ + struct switchtec_dev *stdev; + struct switchtec_user *stuser; + + stdev = container_of(inode->i_cdev, struct switchtec_dev, cdev); + + stuser = stuser_create(stdev); + if (!stuser) + return PTR_ERR(stuser); + + filp->private_data = stuser; + nonseekable_open(inode, filp); + + dev_dbg(&stdev->dev, "%s: %p\n", __func__, stuser); + + return 0; +} + +static int switchtec_dev_release(struct inode *inode, struct file *filp) +{ + struct switchtec_user *stuser = filp->private_data; + + stuser_put(stuser); + + return 0; +} + +static int lock_mutex_and_test_alive(struct switchtec_dev *stdev) +{ + if (mutex_lock_interruptible(&stdev->mrpc_mutex)) + return -EINTR; + + if (!stdev->alive) { + mutex_unlock(&stdev->mrpc_mutex); + return -ENODEV; + } + + return 0; +} + +static ssize_t switchtec_dev_write(struct file *filp, const char __user *data, + size_t size, loff_t *off) +{ + struct switchtec_user *stuser = filp->private_data; + struct switchtec_dev *stdev = stuser->stdev; + int rc; + + if (size < sizeof(stuser->cmd) || + size > sizeof(stuser->cmd) + sizeof(stuser->data)) + return -EINVAL; + + stuser->data_len = size - sizeof(stuser->cmd); + + rc = lock_mutex_and_test_alive(stdev); + if (rc) + return -rc; + + if (stuser->state != MRPC_IDLE) { + rc = -EBADE; + goto out; + } + + rc = copy_from_user(&stuser->cmd, data, sizeof(stuser->cmd)); + if (rc) { + rc = -EFAULT; + goto out; + } + + data += sizeof(stuser->cmd); + rc = copy_from_user(&stuser->data, data, size - sizeof(stuser->cmd)); + if (rc) { + rc = -EFAULT; + goto out; + } + + rc = mrpc_queue_cmd(stuser); + +out: + mutex_unlock(&stdev->mrpc_mutex); + + if (rc) + return rc; + + return size; +} + +static ssize_t switchtec_dev_read(struct file *filp, char __user *data, + size_t size, loff_t *off) +{ + struct switchtec_user *stuser = filp->private_data; + struct switchtec_dev *stdev = stuser->stdev; + int rc; + + if (size < sizeof(stuser->cmd) || + size > sizeof(stuser->cmd) + sizeof(stuser->data)) + return -EINVAL; + + rc = lock_mutex_and_test_alive(stdev); + if (rc) + return -rc; + + if (stuser->state == MRPC_IDLE) { + mutex_unlock(&stdev->mrpc_mutex); + return -EBADE; + } + + stuser->read_len = size - sizeof(stuser->return_code); + + mutex_unlock(&stdev->mrpc_mutex); + + if (filp->f_flags & O_NONBLOCK) { + if (!try_wait_for_completion(&stuser->comp)) + return -EAGAIN; + } else { + rc = wait_for_completion_interruptible(&stuser->comp); + if (rc < 0) + return rc; + } + + rc = lock_mutex_and_test_alive(stdev); + if (rc) + return -rc; + + if (stuser->state != MRPC_DONE) { + mutex_unlock(&stdev->mrpc_mutex); + return -EBADE; + } + + rc = copy_to_user(data, &stuser->return_code, + sizeof(stuser->return_code)); + if (rc) { + rc = -EFAULT; + goto out; + } + + data += sizeof(stuser->return_code); + rc = copy_to_user(data, &stuser->data, + size - sizeof(stuser->return_code)); + if (rc) { + rc = -EFAULT; + goto out; + } + + stuser_set_state(stuser, MRPC_IDLE); + +out: + mutex_unlock(&stdev->mrpc_mutex); + + if (stuser->status == SWITCHTEC_MRPC_STATUS_DONE) + return size; + else if (stuser->status == SWITCHTEC_MRPC_STATUS_INTERRUPTED) + return -ENXIO; + else + return -EBADMSG; +} + +static unsigned int switchtec_dev_poll(struct file *filp, poll_table *wait) +{ + struct switchtec_user *stuser = filp->private_data; + struct switchtec_dev *stdev = stuser->stdev; + int ret = 0; + + poll_wait(filp, &stuser->comp.wait, wait); + poll_wait(filp, &stdev->event_wq, wait); + + if (lock_mutex_and_test_alive(stdev)) + return POLLIN | POLLRDHUP | POLLOUT | POLLERR | POLLHUP; + + mutex_unlock(&stdev->mrpc_mutex); + + if (try_wait_for_completion(&stuser->comp)) + ret |= POLLIN | POLLRDNORM; + + if (stuser->event_cnt != atomic_read(&stdev->event_cnt)) + ret |= POLLPRI | POLLRDBAND; + + return ret; +} + +static const struct file_operations switchtec_fops = { + .owner = THIS_MODULE, + .open = switchtec_dev_open, + .release = switchtec_dev_release, + .write = switchtec_dev_write, + .read = switchtec_dev_read, + .poll = switchtec_dev_poll, +}; + +static void stdev_release(struct device *dev) +{ + struct switchtec_dev *stdev = to_stdev(dev); + + kfree(stdev); +} + +static void stdev_kill(struct switchtec_dev *stdev) +{ + struct switchtec_user *stuser, *tmpuser; + + pci_clear_master(stdev->pdev); + + cancel_delayed_work_sync(&stdev->mrpc_timeout); + + /* Mark the hardware as unavailable and complete all completions */ + mutex_lock(&stdev->mrpc_mutex); + stdev->alive = false; + + /* Wake up and kill any users waiting on an MRPC request */ + list_for_each_entry_safe(stuser, tmpuser, &stdev->mrpc_queue, list) { + complete_all(&stuser->comp); + list_del_init(&stuser->list); + stuser_put(stuser); + } + + mutex_unlock(&stdev->mrpc_mutex); + + /* Wake up any users waiting on event_wq */ + wake_up_interruptible(&stdev->event_wq); +} + +static struct switchtec_dev *stdev_create(struct pci_dev *pdev) +{ + struct switchtec_dev *stdev; + int minor; + struct device *dev; + struct cdev *cdev; + int rc; + + stdev = kzalloc_node(sizeof(*stdev), GFP_KERNEL, + dev_to_node(&pdev->dev)); + if (!stdev) + return ERR_PTR(-ENOMEM); + + stdev->alive = true; + stdev->pdev = pdev; + INIT_LIST_HEAD(&stdev->mrpc_queue); + mutex_init(&stdev->mrpc_mutex); + stdev->mrpc_busy = 0; + INIT_WORK(&stdev->mrpc_work, mrpc_event_work); + INIT_DELAYED_WORK(&stdev->mrpc_timeout, mrpc_timeout_work); + init_waitqueue_head(&stdev->event_wq); + atomic_set(&stdev->event_cnt, 0); + + dev = &stdev->dev; + device_initialize(dev); + dev->class = switchtec_class; + dev->parent = &pdev->dev; + dev->release = stdev_release; + + minor = ida_simple_get(&switchtec_minor_ida, 0, 0, + GFP_KERNEL); + if (minor < 0) { + rc = minor; + goto err_put; + } + + dev->devt = MKDEV(MAJOR(switchtec_devt), minor); + dev_set_name(dev, "switchtec%d", minor); + + cdev = &stdev->cdev; + cdev_init(cdev, &switchtec_fops); + cdev->owner = THIS_MODULE; + cdev->kobj.parent = &dev->kobj; + + return stdev; + +err_put: + put_device(&stdev->dev); + return ERR_PTR(rc); +} + +static irqreturn_t switchtec_event_isr(int irq, void *dev) +{ + struct switchtec_dev *stdev = dev; + u32 reg; + irqreturn_t ret = IRQ_NONE; + + reg = ioread32(&stdev->mmio_part_cfg->mrpc_comp_hdr); + if (reg & SWITCHTEC_EVENT_OCCURRED) { + dev_dbg(&stdev->dev, "%s: mrpc comp\n", __func__); + ret = IRQ_HANDLED; + schedule_work(&stdev->mrpc_work); + iowrite32(reg, &stdev->mmio_part_cfg->mrpc_comp_hdr); + } + + return ret; +} + +static int switchtec_init_isr(struct switchtec_dev *stdev) +{ + int nvecs; + int event_irq; + + nvecs = pci_alloc_irq_vectors(stdev->pdev, 1, 4, + PCI_IRQ_MSIX | PCI_IRQ_MSI); + if (nvecs < 0) + return nvecs; + + event_irq = ioread32(&stdev->mmio_part_cfg->vep_vector_number); + if (event_irq < 0 || event_irq >= nvecs) + return -EFAULT; + + event_irq = pci_irq_vector(stdev->pdev, event_irq); + if (event_irq < 0) + return event_irq; + + return devm_request_irq(&stdev->pdev->dev, event_irq, + switchtec_event_isr, 0, + KBUILD_MODNAME, stdev); +} + +static void init_pff(struct switchtec_dev *stdev) +{ + int i; + u32 reg; + struct part_cfg_regs *pcfg = stdev->mmio_part_cfg; + + for (i = 0; i < SWITCHTEC_MAX_PFF_CSR; i++) { + reg = ioread16(&stdev->mmio_pff_csr[i].vendor_id); + if (reg != MICROSEMI_VENDOR_ID) + break; + } + + stdev->pff_csr_count = i; + + reg = ioread32(&pcfg->usp_pff_inst_id); + if (reg < SWITCHTEC_MAX_PFF_CSR) + stdev->pff_local[reg] = 1; + + reg = ioread32(&pcfg->vep_pff_inst_id); + if (reg < SWITCHTEC_MAX_PFF_CSR) + stdev->pff_local[reg] = 1; + + for (i = 0; i < ARRAY_SIZE(pcfg->dsp_pff_inst_id); i++) { + reg = ioread32(&pcfg->dsp_pff_inst_id[i]); + if (reg < SWITCHTEC_MAX_PFF_CSR) + stdev->pff_local[reg] = 1; + } +} + +static int switchtec_init_pci(struct switchtec_dev *stdev, + struct pci_dev *pdev) +{ + int rc; + + rc = pcim_enable_device(pdev); + if (rc) + return rc; + + rc = pcim_iomap_regions(pdev, 0x1, KBUILD_MODNAME); + if (rc) + return rc; + + pci_set_master(pdev); + + stdev->mmio = pcim_iomap_table(pdev)[0]; + stdev->mmio_mrpc = stdev->mmio + SWITCHTEC_GAS_MRPC_OFFSET; + stdev->mmio_sw_event = stdev->mmio + SWITCHTEC_GAS_SW_EVENT_OFFSET; + stdev->mmio_sys_info = stdev->mmio + SWITCHTEC_GAS_SYS_INFO_OFFSET; + stdev->mmio_flash_info = stdev->mmio + SWITCHTEC_GAS_FLASH_INFO_OFFSET; + stdev->mmio_ntb = stdev->mmio + SWITCHTEC_GAS_NTB_OFFSET; + stdev->partition = ioread8(&stdev->mmio_ntb->partition_id); + stdev->partition_count = ioread8(&stdev->mmio_ntb->partition_count); + stdev->mmio_part_cfg_all = stdev->mmio + SWITCHTEC_GAS_PART_CFG_OFFSET; + stdev->mmio_part_cfg = &stdev->mmio_part_cfg_all[stdev->partition]; + stdev->mmio_pff_csr = stdev->mmio + SWITCHTEC_GAS_PFF_CSR_OFFSET; + + init_pff(stdev); + + pci_set_drvdata(pdev, stdev); + + return 0; +} + +static int switchtec_pci_probe(struct pci_dev *pdev, + const struct pci_device_id *id) +{ + struct switchtec_dev *stdev; + int rc; + + stdev = stdev_create(pdev); + if (IS_ERR(stdev)) + return PTR_ERR(stdev); + + rc = switchtec_init_pci(stdev, pdev); + if (rc) + goto err_put; + + rc = switchtec_init_isr(stdev); + if (rc) { + dev_err(&stdev->dev, "failed to init isr.\n"); + goto err_put; + } + + iowrite32(SWITCHTEC_EVENT_CLEAR | + SWITCHTEC_EVENT_EN_IRQ, + &stdev->mmio_part_cfg->mrpc_comp_hdr); + + rc = cdev_add(&stdev->cdev, stdev->dev.devt, 1); + if (rc) + goto err_put; + + rc = device_add(&stdev->dev); + if (rc) + goto err_devadd; + + dev_info(&stdev->dev, "Management device registered.\n"); + + return 0; + +err_devadd: + cdev_del(&stdev->cdev); + stdev_kill(stdev); +err_put: + ida_simple_remove(&switchtec_minor_ida, MINOR(stdev->dev.devt)); + put_device(&stdev->dev); + return rc; +} + +static void switchtec_pci_remove(struct pci_dev *pdev) +{ + struct switchtec_dev *stdev = pci_get_drvdata(pdev); + + pci_set_drvdata(pdev, NULL); + + device_del(&stdev->dev); + cdev_del(&stdev->cdev); + ida_simple_remove(&switchtec_minor_ida, MINOR(stdev->dev.devt)); + dev_info(&stdev->dev, "unregistered.\n"); + + stdev_kill(stdev); + put_device(&stdev->dev); +} + +#define SWITCHTEC_PCI_DEVICE(device_id) \ + { \ + .vendor = MICROSEMI_VENDOR_ID, \ + .device = device_id, \ + .subvendor = PCI_ANY_ID, \ + .subdevice = PCI_ANY_ID, \ + .class = MICROSEMI_MGMT_CLASSCODE, \ + .class_mask = 0xFFFFFFFF, \ + }, \ + { \ + .vendor = MICROSEMI_VENDOR_ID, \ + .device = device_id, \ + .subvendor = PCI_ANY_ID, \ + .subdevice = PCI_ANY_ID, \ + .class = MICROSEMI_NTB_CLASSCODE, \ + .class_mask = 0xFFFFFFFF, \ + } + +static const struct pci_device_id switchtec_pci_tbl[] = { + SWITCHTEC_PCI_DEVICE(0x8531), //PFX 24xG3 + SWITCHTEC_PCI_DEVICE(0x8532), //PFX 32xG3 + SWITCHTEC_PCI_DEVICE(0x8533), //PFX 48xG3 + SWITCHTEC_PCI_DEVICE(0x8534), //PFX 64xG3 + SWITCHTEC_PCI_DEVICE(0x8535), //PFX 80xG3 + SWITCHTEC_PCI_DEVICE(0x8536), //PFX 96xG3 + SWITCHTEC_PCI_DEVICE(0x8543), //PSX 48xG3 + SWITCHTEC_PCI_DEVICE(0x8544), //PSX 64xG3 + SWITCHTEC_PCI_DEVICE(0x8545), //PSX 80xG3 + SWITCHTEC_PCI_DEVICE(0x8546), //PSX 96xG3 + {0} +}; +MODULE_DEVICE_TABLE(pci, switchtec_pci_tbl); + +static struct pci_driver switchtec_pci_driver = { + .name = KBUILD_MODNAME, + .id_table = switchtec_pci_tbl, + .probe = switchtec_pci_probe, + .remove = switchtec_pci_remove, +}; + +static int __init switchtec_init(void) +{ + int rc; + + rc = alloc_chrdev_region(&switchtec_devt, 0, max_devices, + "switchtec"); + if (rc) + return rc; + + switchtec_class = class_create(THIS_MODULE, "switchtec"); + if (IS_ERR(switchtec_class)) { + rc = PTR_ERR(switchtec_class); + goto err_create_class; + } + + rc = pci_register_driver(&switchtec_pci_driver); + if (rc) + goto err_pci_register; + + pr_info(KBUILD_MODNAME ": loaded.\n"); + + return 0; + +err_pci_register: + class_destroy(switchtec_class); + +err_create_class: + unregister_chrdev_region(switchtec_devt, max_devices); + + return rc; +} +module_init(switchtec_init); + +static void __exit switchtec_exit(void) +{ + pci_unregister_driver(&switchtec_pci_driver); + class_destroy(switchtec_class); + unregister_chrdev_region(switchtec_devt, max_devices); + ida_destroy(&switchtec_minor_ida); + + pr_info(KBUILD_MODNAME ": unloaded.\n"); +} +module_exit(switchtec_exit); -- 2.1.4
