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Date: Wed, 4 Mar 2020 12:00:38 +0100
From: Frederic Barrat <fbarrat@...ux.ibm.com>
To: "Alastair D'Silva" <alastair@....ibm.com>, alastair@...ilva.org
Cc: "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
"Oliver O'Halloran" <oohall@...il.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
Andrew Donnellan <ajd@...ux.ibm.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Dan Williams <dan.j.williams@...el.com>,
Vishal Verma <vishal.l.verma@...el.com>,
Dave Jiang <dave.jiang@...el.com>,
Ira Weiny <ira.weiny@...el.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Rob Herring <robh@...nel.org>,
Anton Blanchard <anton@...abs.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
Cédric Le Goater <clg@...d.org>,
Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
Hari Bathini <hbathini@...ux.ibm.com>,
Thomas Gleixner <tglx@...utronix.de>,
Greg Kurz <groug@...d.org>,
Nicholas Piggin <npiggin@...il.com>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
Alexey Kardashevskiy <aik@...abs.ru>,
linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-nvdimm@...ts.01.org, linux-mm@...ck.org
Subject: Re: [PATCH v3 20/27] powerpc/powernv/pmem: Forward events to
userspace
Le 21/02/2020 à 04:27, Alastair D'Silva a écrit :
> From: Alastair D'Silva <alastair@...ilva.org>
>
> 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@...ilva.org>
> ---
> arch/powerpc/platforms/powernv/pmem/ocxl.c | 216 ++++++++++++++++++
> .../platforms/powernv/pmem/ocxl_internal.h | 5 +
> include/uapi/nvdimm/ocxl-pmem.h | 16 ++
> 3 files changed, 237 insertions(+)
>
> diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl.c b/arch/powerpc/platforms/powernv/pmem/ocxl.c
> index 009d4fd29e7d..e46696d3cc36 100644
> --- a/arch/powerpc/platforms/powernv/pmem/ocxl.c
> +++ b/arch/powerpc/platforms/powernv/pmem/ocxl.c
> @@ -10,6 +10,7 @@
> #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>
> @@ -335,11 +336,22 @@ static void free_ocxlpmem(struct ocxlpmem *ocxlpmem)
> {
> int rc;
>
> + // Disable doorbells
> + (void)ocxl_global_mmio_set64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_CHIEC,
> + OCXL_LITTLE_ENDIAN,
> + GLOBAL_MMIO_CHI_ALL);
> +
> if (ocxlpmem->nvdimm_bus)
> nvdimm_bus_unregister(ocxlpmem->nvdimm_bus);
>
> free_minor(ocxlpmem);
>
> + if (ocxlpmem->irq_addr[1])
> + iounmap(ocxlpmem->irq_addr[1]);
> +
> + if (ocxlpmem->irq_addr[0])
> + iounmap(ocxlpmem->irq_addr[0]);
> +
> if (ocxlpmem->cdev.owner)
> cdev_del(&ocxlpmem->cdev);
>
> @@ -443,6 +455,11 @@ static int file_release(struct inode *inode, struct file *file)
> {
> struct ocxlpmem *ocxlpmem = file->private_data;
>
> + if (ocxlpmem->ev_ctx) {
> + eventfd_ctx_put(ocxlpmem->ev_ctx);
> + ocxlpmem->ev_ctx = NULL;
> + }
> +
> ocxlpmem_put(ocxlpmem);
> return 0;
> }
> @@ -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;
EBUSY?
> +
> + ocxlpmem->ev_ctx = eventfd_ctx_fdget(args.eventfd);
> + if (!ocxlpmem->ev_ctx)
> + return -EFAULT;
Why not use what eventfd_ctx_fdget() returned? (through some IS_ERR()
and PTR_ERR() convolution)
> +
> + 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));
> +
copy_to_user doesn't return an errno. Should be:
if (copy_to_user((u64 __user *) uarg, &val, sizeof(val)))
return -EFAULT;
> + 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);
> + }
> +
> +
(at least) one empty line too many.
> + 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;
> +
> + 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;
That's a few lines of duplicate code. On the other hand, there's enough
varying parameters between the 2 interrupts that factorizing in a
subfunction would be slightly less readable. So duplicating is probably ok.
> + 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);
GLOBAL_MMIO_CHI_NSCRA doesn't seem to be handled in the handlers.
> + 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");
Like with other patches, rc needs to be set.
> + 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];
irq_pgmap is not used.
> + void *irq_addr[SCM_IRQ_COUNT];
> struct nd_interleave_set nd_set;
> struct nvdimm_bus_descriptor bus_desc;
> struct nvdimm_bus *nvdimm_bus;
> @@ -113,6 +117,7 @@ struct ocxlpmem {
> struct command_metadata ns_command;
> struct resource pmem_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-pmem.h b/include/uapi/nvdimm/ocxl-pmem.h
> index add223aa2fdb..988eb0bc413d 100644
> --- a/include/uapi/nvdimm/ocxl-pmem.h
> +++ b/include/uapi/nvdimm/ocxl-pmem.h
> @@ -66,6 +66,20 @@ struct ioctl_ocxl_pmem_controller_stats {
> __u64 cache_write_latency; /* nanoseconds */
> };
>
> +struct ioctl_ocxl_pmem_eventfd {
> + __s32 eventfd;
> + __u32 reserved;
> +};
> +
> +#ifndef BIT_ULL
> +#define BIT_ULL(nr) (1ULL << (nr))
> +#endif
> +
> +#define IOCTL_OCXL_PMEM_EVENT_CONTROLLER_DUMP_AVAILABLE BIT_ULL(0)
> +#define IOCTL_OCXL_PMEM_EVENT_ERROR_LOG_AVAILABLE BIT_ULL(1)
> +#define IOCTL_OCXL_PMEM_EVENT_HARDWARE_FATAL BIT_ULL(2)
> +#define IOCTL_OCXL_PMEM_EVENT_FIRMWARE_FATAL BIT_ULL(3)
> +
I'm not fond of adding a macro with such a generic name as BIT_ULL() in
a user header file. What's wrong with:
#define IOCTL_OCXL_PMEM_EVENT_CONTROLLER_DUMP_AVAILABLE 0x1
#define IOCTL_OCXL_PMEM_EVENT_ERROR_LOG_AVAILABLE 0x2
#define IOCTL_OCXL_PMEM_EVENT_HARDWARE_FATAL 0x4
#define IOCTL_OCXL_PMEM_EVENT_FIRMWARE_FATAL 0x8
Fred
> /* ioctl numbers */
> #define OCXL_PMEM_MAGIC 0x5C
> /* SCM devices */
> @@ -74,5 +88,7 @@ struct ioctl_ocxl_pmem_controller_stats {
> #define IOCTL_OCXL_PMEM_CONTROLLER_DUMP_DATA _IOWR(OCXL_PMEM_MAGIC, 0x03, struct ioctl_ocxl_pmem_controller_dump_data)
> #define IOCTL_OCXL_PMEM_CONTROLLER_DUMP_COMPLETE _IO(OCXL_PMEM_MAGIC, 0x04)
> #define IOCTL_OCXL_PMEM_CONTROLLER_STATS _IO(OCXL_PMEM_MAGIC, 0x05)
> +#define IOCTL_OCXL_PMEM_EVENTFD _IOW(OCXL_PMEM_MAGIC, 0x06, struct ioctl_ocxl_pmem_eventfd)
> +#define IOCTL_OCXL_PMEM_EVENT_CHECK _IOR(OCXL_PMEM_MAGIC, 0x07, __u64)
>
> #endif /* _UAPI_OCXL_SCM_H */
>
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