From: Alastair D'Silva <alastair@xxxxxxxxxxx> Some of the interrupts that the card generates are better handled by the userspace daemon, in particular: Controller Hardware/Firmware Fatal Controller Dump Available Error Log available This patch allows a userspace application to register an eventfd with the driver via SCM_IOCTL_EVENTFD to receive notifications of these interrupts. Userspace can then identify what events have occurred by calling SCM_IOCTL_EVENT_CHECK and checking against the SCM_IOCTL_EVENT_FOO masks. Signed-off-by: Alastair D'Silva <alastair@xxxxxxxxxxx> --- drivers/nvdimm/ocxl/scm.c | 216 +++++++++++++++++++++++++++++ drivers/nvdimm/ocxl/scm_internal.h | 5 + include/uapi/nvdimm/ocxl-scm.h | 16 +++ 3 files changed, 237 insertions(+) diff --git a/drivers/nvdimm/ocxl/scm.c b/drivers/nvdimm/ocxl/scm.c index 54a2bac1cab7..854787950334 100644 --- a/drivers/nvdimm/ocxl/scm.c +++ b/drivers/nvdimm/ocxl/scm.c @@ -9,6 +9,7 @@ #include <misc/ocxl.h> #include <linux/delay.h> #include <linux/ndctl.h> +#include <linux/eventfd.h> #include <linux/fs.h> #include <linux/mm_types.h> #include <linux/memory_hotplug.h> @@ -382,11 +383,22 @@ static void free_scm(struct scm_data *scm_data) { int rc; + // Disable doorbells + (void)ocxl_global_mmio_set64(scm_data->ocxl_afu, GLOBAL_MMIO_CHIEC, + OCXL_LITTLE_ENDIAN, + GLOBAL_MMIO_CHI_ALL); + if (scm_data->nvdimm_bus) nvdimm_bus_unregister(scm_data->nvdimm_bus); free_scm_minor(scm_data); + if (scm_data->irq_addr[1]) + iounmap(scm_data->irq_addr[1]); + + if (scm_data->irq_addr[0]) + iounmap(scm_data->irq_addr[0]); + if (scm_data->cdev.owner) cdev_del(&scm_data->cdev); @@ -491,6 +503,11 @@ static int scm_file_release(struct inode *inode, struct file *file) { struct scm_data *scm_data = file->private_data; + if (scm_data->ev_ctx) { + eventfd_ctx_put(scm_data->ev_ctx); + scm_data->ev_ctx = NULL; + } + scm_put(scm_data); return 0; } @@ -986,6 +1003,51 @@ static int scm_ioctl_controller_stats(struct scm_data *scm_data, return rc; } +static int scm_ioctl_eventfd(struct scm_data *scm_data, + struct scm_ioctl_eventfd __user *uarg) +{ + struct scm_ioctl_eventfd args; + + if (copy_from_user(&args, uarg, sizeof(args))) + return -EFAULT; + + if (scm_data->ev_ctx) + return -EINVAL; + + scm_data->ev_ctx = eventfd_ctx_fdget(args.eventfd); + if (!scm_data->ev_ctx) + return -EFAULT; + + return 0; +} + +static int scm_ioctl_event_check(struct scm_data *scm_data, u64 __user *uarg) +{ + u64 val = 0; + int rc; + u64 chi = 0; + + rc = scm_chi(scm_data, &chi); + if (rc < 0) + return rc; + + if (chi & GLOBAL_MMIO_CHI_ELA) + val |= SCM_IOCTL_EVENT_ERROR_LOG_AVAILABLE; + + if (chi & GLOBAL_MMIO_CHI_CDA) + val |= SCM_IOCTL_EVENT_CONTROLLER_DUMP_AVAILABLE; + + if (chi & GLOBAL_MMIO_CHI_CFFS) + val |= SCM_IOCTL_EVENT_FIRMWARE_FATAL; + + if (chi & GLOBAL_MMIO_CHI_CHFS) + val |= SCM_IOCTL_EVENT_HARDWARE_FATAL; + + rc = copy_to_user((u64 __user *) uarg, &val, sizeof(val)); + + return rc; +} + static long scm_file_ioctl(struct file *file, unsigned int cmd, unsigned long args) { @@ -1015,6 +1077,15 @@ static long scm_file_ioctl(struct file *file, unsigned int cmd, rc = scm_ioctl_controller_stats(scm_data, (struct scm_ioctl_controller_stats __user *)args); break; + + case SCM_IOCTL_EVENTFD: + rc = scm_ioctl_eventfd(scm_data, + (struct scm_ioctl_eventfd __user *)args); + break; + + case SCM_IOCTL_EVENT_CHECK: + rc = scm_ioctl_event_check(scm_data, (u64 __user *)args); + break; } return rc; @@ -1156,6 +1227,146 @@ static void scm_dump_error_log(struct scm_data *scm_data) kfree(buf); } +static irqreturn_t scm_imn0_handler(void *private) +{ + struct scm_data *scm_data = private; + u64 chi = 0; + + (void)scm_chi(scm_data, &chi); + + if (chi & GLOBAL_MMIO_CHI_ELA) { + dev_warn(&scm_data->dev, "Error log is available\n"); + + if (scm_data->ev_ctx) + eventfd_signal(scm_data->ev_ctx, 1); + } + + if (chi & GLOBAL_MMIO_CHI_CDA) { + dev_warn(&scm_data->dev, "Controller dump is available\n"); + + if (scm_data->ev_ctx) + eventfd_signal(scm_data->ev_ctx, 1); + } + + + return IRQ_HANDLED; +} + +static irqreturn_t scm_imn1_handler(void *private) +{ + struct scm_data *scm_data = private; + u64 chi = 0; + + (void)scm_chi(scm_data, &chi); + + if (chi & (GLOBAL_MMIO_CHI_CFFS | GLOBAL_MMIO_CHI_CHFS)) { + dev_err(&scm_data->dev, + "Controller status is fatal, chi=0x%llx, going offline\n", chi); + + if (scm_data->nvdimm_bus) { + nvdimm_bus_unregister(scm_data->nvdimm_bus); + scm_data->nvdimm_bus = NULL; + } + + if (scm_data->ev_ctx) + eventfd_signal(scm_data->ev_ctx, 1); + } + + return IRQ_HANDLED; +} + + +/** + * scm_setup_irq() - Set up the IRQs for the SCM device + * @scm_data: the SCM metadata + * Return: 0 on success, negative on failure + */ +static int scm_setup_irq(struct scm_data *scm_data) +{ + int rc; + u64 irq_addr; + + rc = ocxl_afu_irq_alloc(scm_data->ocxl_context, &scm_data->irq_id[0]); + if (rc) + return rc; + + rc = ocxl_irq_set_handler(scm_data->ocxl_context, scm_data->irq_id[0], + scm_imn0_handler, NULL, scm_data); + + irq_addr = ocxl_afu_irq_get_addr(scm_data->ocxl_context, scm_data->irq_id[0]); + if (!irq_addr) + return -EINVAL; + + scm_data->irq_addr[0] = ioremap(irq_addr, PAGE_SIZE); + if (!scm_data->irq_addr[0]) + return -EINVAL; + + rc = ocxl_global_mmio_write64(scm_data->ocxl_afu, GLOBAL_MMIO_IMA0_OHP, + OCXL_LITTLE_ENDIAN, + (u64)scm_data->irq_addr[0]); + if (rc) + goto out_irq0; + + rc = ocxl_global_mmio_write64(scm_data->ocxl_afu, GLOBAL_MMIO_IMA0_CFP, + OCXL_LITTLE_ENDIAN, 0); + if (rc) + goto out_irq0; + + rc = ocxl_afu_irq_alloc(scm_data->ocxl_context, &scm_data->irq_id[1]); + if (rc) + goto out_irq0; + + + rc = ocxl_irq_set_handler(scm_data->ocxl_context, scm_data->irq_id[1], + scm_imn1_handler, NULL, scm_data); + if (rc) + goto out_irq0; + + irq_addr = ocxl_afu_irq_get_addr(scm_data->ocxl_context, scm_data->irq_id[1]); + if (!irq_addr) { + rc = -EFAULT; + goto out_irq0; + } + + scm_data->irq_addr[1] = ioremap(irq_addr, PAGE_SIZE); + if (!scm_data->irq_addr[1]) { + rc = -EINVAL; + goto out_irq0; + } + + rc = ocxl_global_mmio_write64(scm_data->ocxl_afu, GLOBAL_MMIO_IMA1_OHP, + OCXL_LITTLE_ENDIAN, + (u64)scm_data->irq_addr[1]); + if (rc) + goto out_irq1; + + rc = ocxl_global_mmio_write64(scm_data->ocxl_afu, GLOBAL_MMIO_IMA1_CFP, + OCXL_LITTLE_ENDIAN, 0); + if (rc) + goto out_irq1; + + // Enable doorbells + rc = ocxl_global_mmio_set64(scm_data->ocxl_afu, GLOBAL_MMIO_CHIE, + OCXL_LITTLE_ENDIAN, + GLOBAL_MMIO_CHI_ELA | GLOBAL_MMIO_CHI_CDA | + GLOBAL_MMIO_CHI_CFFS | GLOBAL_MMIO_CHI_CHFS | + GLOBAL_MMIO_CHI_NSCRA); + if (rc) + goto out_irq1; + + return 0; + +out_irq1: + iounmap(scm_data->irq_addr[1]); + scm_data->irq_addr[1] = NULL; + +out_irq0: + iounmap(scm_data->irq_addr[0]); + scm_data->irq_addr[0] = NULL; + + return rc; +} + /** * scm_probe_function_0 - Set up function 0 for an OpenCAPI Storage Class Memory device * This is important as it enables templates higher than 0 across all other functions, @@ -1261,6 +1472,11 @@ static int scm_probe(struct pci_dev *pdev, const struct pci_device_id *ent) goto err; } + if (scm_setup_irq(scm_data)) { + dev_err(&pdev->dev, "Could not set up OCXL IRQs for SCM\n"); + goto err; + } + if (scm_setup_command_metadata(scm_data)) { dev_err(&pdev->dev, "Could not read OCXL command matada\n"); goto err; diff --git a/drivers/nvdimm/ocxl/scm_internal.h b/drivers/nvdimm/ocxl/scm_internal.h index 9bf8fcf30ea6..693fd59f8bde 100644 --- a/drivers/nvdimm/ocxl/scm_internal.h +++ b/drivers/nvdimm/ocxl/scm_internal.h @@ -104,6 +104,10 @@ struct scm_data { struct pci_dev *pdev; struct cdev cdev; struct ocxl_fn *ocxl_fn; +#define SCM_IRQ_COUNT 2 + int irq_id[SCM_IRQ_COUNT]; + struct dev_pagemap irq_pgmap[SCM_IRQ_COUNT]; + void *irq_addr[SCM_IRQ_COUNT]; struct nd_interleave_set nd_set; struct nvdimm_bus_descriptor bus_desc; struct nvdimm_bus *nvdimm_bus; @@ -114,6 +118,7 @@ struct scm_data { struct command_metadata ns_command; struct resource scm_res; struct nd_region *nd_region; + struct eventfd_ctx *ev_ctx; char fw_version[8+1]; u32 timeouts[ADMIN_COMMAND_MAX+1]; diff --git a/include/uapi/nvdimm/ocxl-scm.h b/include/uapi/nvdimm/ocxl-scm.h index 0a5de46c5acd..e86ffb02d31f 100644 --- a/include/uapi/nvdimm/ocxl-scm.h +++ b/include/uapi/nvdimm/ocxl-scm.h @@ -66,6 +66,20 @@ struct scm_ioctl_controller_stats { __u64 cache_write_latency; // nanoseconds }; +struct scm_ioctl_eventfd { + __s32 eventfd; + __u32 reserved; +}; + +#ifndef BIT_ULL +#define BIT_ULL(nr) (1ULL << (nr)) +#endif + +#define SCM_IOCTL_EVENT_CONTROLLER_DUMP_AVAILABLE BIT_ULL(0) +#define SCM_IOCTL_EVENT_ERROR_LOG_AVAILABLE BIT_ULL(1) +#define SCM_IOCTL_EVENT_HARDWARE_FATAL BIT_ULL(2) +#define SCM_IOCTL_EVENT_FIRMWARE_FATAL BIT_ULL(3) + /* ioctl numbers */ #define SCM_MAGIC 0x5C /* SCM devices */ @@ -74,5 +88,7 @@ struct scm_ioctl_controller_stats { #define SCM_IOCTL_CONTROLLER_DUMP_DATA _IOWR(SCM_MAGIC, 0x03, struct scm_ioctl_controller_dump_data) #define SCM_IOCTL_CONTROLLER_DUMP_COMPLETE _IO(SCM_MAGIC, 0x04) #define SCM_IOCTL_CONTROLLER_STATS _IO(SCM_MAGIC, 0x05) +#define SCM_IOCTL_EVENTFD _IOW(SCM_MAGIC, 0x06, struct scm_ioctl_eventfd) +#define SCM_IOCTL_EVENT_CHECK _IOR(SCM_MAGIC, 0x07, __u64) #endif /* _UAPI_OCXL_SCM_H */ -- 2.23.0