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SubjectRe: [PATCH v3 20/27] powerpc/powernv/pmem: Forward events to userspace
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On 21/2/20 2:27 pm, Alastair D'Silva wrote:> @@ -938,6 +955,51 @@ static 
int ioctl_controller_stats(struct ocxlpmem *ocxlpmem,
> return rc;
> }
>
> +static int ioctl_eventfd(struct ocxlpmem *ocxlpmem,
> + struct ioctl_ocxl_pmem_eventfd __user *uarg)
> +{
> + struct ioctl_ocxl_pmem_eventfd args;
> +
> + if (copy_from_user(&args, uarg, sizeof(args)))
> + return -EFAULT;
> +
> + if (ocxlpmem->ev_ctx)
> + return -EINVAL;

I think EBUSY is more appropriate here.

> +
> + ocxlpmem->ev_ctx = eventfd_ctx_fdget(args.eventfd);
> + if (!ocxlpmem->ev_ctx)
> + return -EFAULT;
> +
> + return 0;
> +}
> +
> +static int ioctl_event_check(struct ocxlpmem *ocxlpmem, u64 __user *uarg)
> +{
> + u64 val = 0;
> + int rc;
> + u64 chi = 0;
> +
> + rc = ocxlpmem_chi(ocxlpmem, &chi);
> + if (rc < 0)
> + return rc;
> +
> + if (chi & GLOBAL_MMIO_CHI_ELA)
> + val |= IOCTL_OCXL_PMEM_EVENT_ERROR_LOG_AVAILABLE;
> +
> + if (chi & GLOBAL_MMIO_CHI_CDA)
> + val |= IOCTL_OCXL_PMEM_EVENT_CONTROLLER_DUMP_AVAILABLE;
> +
> + if (chi & GLOBAL_MMIO_CHI_CFFS)
> + val |= IOCTL_OCXL_PMEM_EVENT_FIRMWARE_FATAL;
> +
> + if (chi & GLOBAL_MMIO_CHI_CHFS)
> + val |= IOCTL_OCXL_PMEM_EVENT_HARDWARE_FATAL;
> +
> + rc = copy_to_user((u64 __user *) uarg, &val, sizeof(val));
> +
> + return rc;
> +}
> +
> static long file_ioctl(struct file *file, unsigned int cmd, unsigned long args)
> {
> struct ocxlpmem *ocxlpmem = file->private_data;
> @@ -966,6 +1028,15 @@ static long file_ioctl(struct file *file, unsigned int cmd, unsigned long args)
> rc = ioctl_controller_stats(ocxlpmem,
> (struct ioctl_ocxl_pmem_controller_stats __user *)args);
> break;
> +
> + case IOCTL_OCXL_PMEM_EVENTFD:
> + rc = ioctl_eventfd(ocxlpmem,
> + (struct ioctl_ocxl_pmem_eventfd __user *)args);
> + break;
> +
> + case IOCTL_OCXL_PMEM_EVENT_CHECK:
> + rc = ioctl_event_check(ocxlpmem, (u64 __user *)args);
> + break;
> }
>
> return rc;
> @@ -1107,6 +1178,146 @@ static void dump_error_log(struct ocxlpmem *ocxlpmem)
> kfree(buf);
> }
>
> +static irqreturn_t imn0_handler(void *private)
> +{
> + struct ocxlpmem *ocxlpmem = private;
> + u64 chi = 0;
> +
> + (void)ocxlpmem_chi(ocxlpmem, &chi);
> +
> + if (chi & GLOBAL_MMIO_CHI_ELA) {
> + dev_warn(&ocxlpmem->dev, "Error log is available\n");
> +
> + if (ocxlpmem->ev_ctx)
> + eventfd_signal(ocxlpmem->ev_ctx, 1);
> + }
> +
> + if (chi & GLOBAL_MMIO_CHI_CDA) {
> + dev_warn(&ocxlpmem->dev, "Controller dump is available\n");
> +
> + if (ocxlpmem->ev_ctx)
> + eventfd_signal(ocxlpmem->ev_ctx, 1);
> + }
> +
> +
> + return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t imn1_handler(void *private)
> +{
> + struct ocxlpmem *ocxlpmem = private;
> + u64 chi = 0;
> +
> + (void)ocxlpmem_chi(ocxlpmem, &chi);
> +
> + if (chi & (GLOBAL_MMIO_CHI_CFFS | GLOBAL_MMIO_CHI_CHFS)) {
> + dev_err(&ocxlpmem->dev,
> + "Controller status is fatal, chi=0x%llx, going offline\n", chi);
> +
> + if (ocxlpmem->nvdimm_bus) {
> + nvdimm_bus_unregister(ocxlpmem->nvdimm_bus);
> + ocxlpmem->nvdimm_bus = NULL;
> + }
> +
> + if (ocxlpmem->ev_ctx)
> + eventfd_signal(ocxlpmem->ev_ctx, 1);
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
> +
> +/**
> + * ocxlpmem_setup_irq() - Set up the IRQs for the OpenCAPI Persistent Memory device
> + * @ocxlpmem: the device metadata
> + * Return: 0 on success, negative on failure
> + */
> +static int ocxlpmem_setup_irq(struct ocxlpmem *ocxlpmem)
> +{
> + int rc;
> + u64 irq_addr;
> +
> + rc = ocxl_afu_irq_alloc(ocxlpmem->ocxl_context, &ocxlpmem->irq_id[0]);
> + if (rc)
> + return rc;
> +
> + rc = ocxl_irq_set_handler(ocxlpmem->ocxl_context, ocxlpmem->irq_id[0],
> + imn0_handler, NULL, ocxlpmem);
> +
> + irq_addr = ocxl_afu_irq_get_addr(ocxlpmem->ocxl_context, ocxlpmem->irq_id[0]);
> + if (!irq_addr)
> + return -EINVAL;
> +
> + ocxlpmem->irq_addr[0] = ioremap(irq_addr, PAGE_SIZE);
> + if (!ocxlpmem->irq_addr[0])
> + return -EINVAL;

Something other than EINVAL for these two

> +
> + rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_IMA0_OHP,
> + OCXL_LITTLE_ENDIAN,
> + (u64)ocxlpmem->irq_addr[0]);
> + if (rc)
> + goto out_irq0;
> +
> + rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_IMA0_CFP,
> + OCXL_LITTLE_ENDIAN, 0);
> + if (rc)
> + goto out_irq0;
> +
> + rc = ocxl_afu_irq_alloc(ocxlpmem->ocxl_context, &ocxlpmem->irq_id[1]);
> + if (rc)
> + goto out_irq0;
> +
> +
> + rc = ocxl_irq_set_handler(ocxlpmem->ocxl_context, ocxlpmem->irq_id[1],
> + imn1_handler, NULL, ocxlpmem);
> + if (rc)
> + goto out_irq0;
> +
> + irq_addr = ocxl_afu_irq_get_addr(ocxlpmem->ocxl_context, ocxlpmem->irq_id[1]);
> + if (!irq_addr) {
> + rc = -EFAULT;
> + goto out_irq0;
> + }
> +
> + ocxlpmem->irq_addr[1] = ioremap(irq_addr, PAGE_SIZE);
> + if (!ocxlpmem->irq_addr[1]) {
> + rc = -EINVAL;
> + goto out_irq0;
> + }
> +
> + rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_IMA1_OHP,
> + OCXL_LITTLE_ENDIAN,
> + (u64)ocxlpmem->irq_addr[1]);
> + if (rc)
> + goto out_irq1;
> +
> + rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_IMA1_CFP,
> + OCXL_LITTLE_ENDIAN, 0);
> + if (rc)
> + goto out_irq1;
> +
> + // Enable doorbells
> + rc = ocxl_global_mmio_set64(ocxlpmem->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);

We don't actually do anything in the handlers with NSCRA...

> + if (rc)
> + goto out_irq1;
> +
> + return 0;
> +
> +out_irq1:
> + iounmap(ocxlpmem->irq_addr[1]);
> + ocxlpmem->irq_addr[1] = NULL;
> +
> +out_irq0:
> + iounmap(ocxlpmem->irq_addr[0]);
> + ocxlpmem->irq_addr[0] = NULL;
> +
> + return rc;
> +}
> +
> /**
> * probe_function0() - Set up function 0 for an OpenCAPI persistent memory device
> * This is important as it enables templates higher than 0 across all other functions,
> @@ -1216,6 +1427,11 @@ static int probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> goto err;
> }
>
> + if (ocxlpmem_setup_irq(ocxlpmem)) {
> + dev_err(&pdev->dev, "Could not set up OCXL IRQs\n");
> + goto err;
> + }
> +
> if (setup_command_metadata(ocxlpmem)) {
> dev_err(&pdev->dev, "Could not read OCXL command matada\n");
> goto err;
> diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
> index b953ee522ed4..927690f4888f 100644
> --- a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
> +++ b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
> @@ -103,6 +103,10 @@ struct ocxlpmem {
> 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];

I think this should be tagged __iomem

--
Andrew Donnellan OzLabs, ADL Canberra
ajd@linux.ibm.com IBM Australia Limited

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