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From: Andrew Donnellan <ajd@linux.ibm.com>
To: "Alastair D'Silva" <alastair@au1.ibm.com>, alastair@d-silva.org
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
	"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
	"Paul Mackerras" <paulus@samba.org>,
	"Michael Ellerman" <mpe@ellerman.id.au>,
	"Frederic Barrat" <fbarrat@linux.ibm.com>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Mauro Carvalho Chehab" <mchehab+samsung@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	"Rob Herring" <robh@kernel.org>,
	"Anton Blanchard" <anton@ozlabs.org>,
	"Krzysztof Kozlowski" <krzk@kernel.org>,
	"Mahesh Salgaonkar" <mahesh@linux.vnet.ibm.com>,
	"Madhavan Srinivasan" <maddy@linux.vnet.ibm.com>,
	"Cédric Le Goater" <clg@kaod.org>,
	"Anju T Sudhakar" <anju@linux.vnet.ibm.com>,
	"Hari Bathini" <hbathini@linux.ibm.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Greg Kurz" <groug@kaod.org>,
	"Nicholas Piggin" <npiggin@gmail.com>,
	"Masahiro Yamada" <yamada.masahiro@socionext.com>,
	"Alexey Kardashevskiy" <aik@ozlabs.ru>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 20/27] powerpc/powernv/pmem: Forward events to userspace
Date: Tue, 3 Mar 2020 18:02:54 +1100	[thread overview]
Message-ID: <d50b19fc-b88a-b4de-4cc5-07790a4ddac0@linux.ibm.com> (raw)
In-Reply-To: <20200221032720.33893-21-alastair@au1.ibm.com>

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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  reply	other threads:[~2020-03-03  7:03 UTC|newest]

Thread overview: 130+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-21  3:26 [PATCH v3 00/27] Add support for OpenCAPI Persistent Memory devices Alastair D'Silva
2020-02-21  3:26 ` [PATCH v3 01/27] powerpc: Add OPAL calls for LPC memory alloc/release Alastair D'Silva
2020-02-24  5:49   ` Andrew Donnellan
2020-02-24  5:50     ` Alastair D'Silva
2020-02-21  3:26 ` [PATCH v3 02/27] mm/memory_hotplug: Allow check_hotplug_memory_addressable to be called from drivers Alastair D'Silva
2020-02-21  7:03   ` Andrew Donnellan
2020-02-21  3:26 ` [PATCH v3 03/27] powerpc: Map & release OpenCAPI LPC memory Alastair D'Silva
2020-02-24  2:51   ` Andrew Donnellan
2020-02-24  5:49     ` Andrew Donnellan
2020-02-25 10:02   ` Frederic Barrat
2020-02-26  0:19     ` Alastair D'Silva
2020-03-03  6:10   ` Andrew Donnellan
2020-03-04  5:33     ` Alastair D'Silva
2020-02-21  3:26 ` [PATCH v3 04/27] ocxl: Remove unnecessary externs Alastair D'Silva
2020-02-21  6:06   ` Andrew Donnellan
2020-02-25 13:23   ` Frederic Barrat
2020-02-26  8:14   ` Baoquan He
2020-02-26  8:26     ` Alastair D'Silva
2020-02-26  9:01       ` Greg Kurz
2020-02-26 14:15         ` 'Baoquan He'
2020-02-26 14:20           ` Greg Kurz
2020-02-26 14:54             ` 'Baoquan He'
2020-02-21  3:26 ` [PATCH v3 05/27] ocxl: Address kernel doc errors & warnings Alastair D'Silva
2020-02-24  2:11   ` Andrew Donnellan
2020-02-21  3:26 ` [PATCH v3 06/27] ocxl: Tally up the LPC memory on a link & allow it to be mapped Alastair D'Silva
2020-02-24  5:25   ` Andrew Donnellan
2020-02-24  5:36     ` Alastair D'Silva
2020-02-25 16:30   ` Frederic Barrat
2020-02-26  0:29     ` Alastair D'Silva
2020-02-21  3:27 ` [PATCH v3 07/27] ocxl: Add functions to map/unmap LPC memory Alastair D'Silva
2020-02-24  6:02   ` Andrew Donnellan
2020-02-24  6:08     ` Alastair D'Silva
2020-02-25 17:01   ` Frederic Barrat
2020-02-21  3:27 ` [PATCH v3 08/27] ocxl: Emit a log message showing how much LPC memory was detected Alastair D'Silva
2020-02-24  6:06   ` Andrew Donnellan
2020-02-24  6:10     ` Alastair D'Silva
2020-02-24  6:13       ` Andrew Donnellan
2020-02-25 17:03   ` Frederic Barrat
2020-02-21  3:27 ` [PATCH v3 09/27] ocxl: Save the device serial number in ocxl_fn Alastair D'Silva
2020-02-21  3:27 ` [PATCH v3 10/27] powerpc: Add driver for OpenCAPI Persistent Memory Alastair D'Silva
2020-02-26  5:07   ` Andrew Donnellan
2020-02-26  5:49     ` Alastair D'Silva
2020-02-27 20:44   ` Frederic Barrat
2020-02-28  0:54     ` Alastair D'Silva
2020-02-28 18:32   ` Frederic Barrat
2020-02-21  3:27 ` [PATCH v3 11/27] powerpc: Enable the OpenCAPI Persistent Memory driver for powernv_defconfig Alastair D'Silva
2020-02-25  3:01   ` Andrew Donnellan
2020-02-21  3:27 ` [PATCH v3 12/27] powerpc/powernv/pmem: Add register addresses & status values to the header Alastair D'Silva
2020-02-27  5:08   ` Andrew Donnellan
2020-02-27  5:16     ` Alastair D'Silva
2020-02-21  3:27 ` [PATCH v3 13/27] powerpc/powernv/pmem: Read the capability registers & wait for device ready Alastair D'Silva
2020-02-27  3:54   ` Andrew Donnellan
2020-02-27  3:58     ` Alastair D'Silva
2020-03-02 17:51   ` Frederic Barrat
2020-03-04  4:15     ` Alastair D'Silva
2020-02-21  3:27 ` [PATCH v3 14/27] powerpc/powernv/pmem: Add support for Admin commands Alastair D'Silva
2020-02-27  8:22   ` Andrew Donnellan
2020-02-27  8:27     ` Andrew Donnellan
2020-02-27 23:54       ` Alastair D'Silva
2020-02-27 23:51     ` Alastair D'Silva
2020-02-27 17:01   ` Dan Williams
2020-02-27 23:57     ` Alastair D'Silva
2020-02-21  3:27 ` [PATCH v3 15/27] powerpc/powernv/pmem: Add support for near storage commands Alastair D'Silva
2020-02-27  8:30   ` Andrew Donnellan
2020-02-27 23:56     ` Alastair D'Silva
2020-02-27 17:02   ` Dan Williams
2020-03-02 17:58   ` Frederic Barrat
2020-03-02 18:42     ` Dan Williams
2020-03-04  4:42       ` Alastair D'Silva
2020-02-21  3:27 ` [PATCH v3 16/27] powerpc/powernv/pmem: Register a character device for userspace to interact with Alastair D'Silva
2020-03-02  5:34   ` Andrew Donnellan
2020-03-02  6:05     ` Alastair D'Silva
2020-03-03  9:28   ` Frederic Barrat
2020-03-05  3:38     ` Alastair D'Silva
2020-02-21  3:27 ` [PATCH v3 17/27] powerpc/powernv/pmem: Implement the Read Error Log command Alastair D'Silva
2020-03-03 10:36   ` Frederic Barrat
2020-03-05  4:31     ` Alastair D'Silva
2020-03-05  9:33       ` Frederic Barrat
2020-03-04  5:58   ` Andrew Donnellan
2020-02-21  3:27 ` [PATCH v3 18/27] powerpc/powernv/pmem: Add controller dump IOCTLs Alastair D'Silva
2020-03-03 18:04   ` Frederic Barrat
2020-03-05 23:37     ` Alastair D'Silva
2020-03-04  6:53   ` Andrew Donnellan
2020-03-06  3:34     ` Alastair D'Silva
2020-02-21  3:27 ` [PATCH v3 19/27] powerpc/powernv/pmem: Add an IOCTL to report controller statistics Alastair D'Silva
2020-03-04  9:25   ` Frederic Barrat
2020-03-12  0:15     ` Alastair D'Silva
2020-03-05  0:46   ` Andrew Donnellan
2020-03-12  4:47     ` Alastair D'Silva
2020-02-21  3:27 ` [PATCH v3 20/27] powerpc/powernv/pmem: Forward events to userspace Alastair D'Silva
2020-03-03  7:02   ` Andrew Donnellan [this message]
2020-03-04  5:48     ` Alastair D'Silva
2020-03-04 11:00   ` Frederic Barrat
2020-03-11  3:32     ` Alastair D'Silva
2020-02-21  3:27 ` [PATCH v3 21/27] powerpc/powernv/pmem: Add an IOCTL to request controller health & perf data Alastair D'Silva
2020-02-28  6:12   ` Andrew Donnellan
2020-03-02  5:40     ` Alastair D'Silva
2020-03-04 11:06     ` Frederic Barrat
2020-03-11  3:38       ` Alastair D'Silva
2020-02-21  3:27 ` [PATCH v3 22/27] powerpc/powernv/pmem: Implement the heartbeat command Alastair D'Silva
2020-02-28  6:20   ` Andrew Donnellan
2020-03-04 14:25   ` Frederic Barrat
2020-02-21  3:27 ` [PATCH v3 23/27] powerpc/powernv/pmem: Add debug IOCTLs Alastair D'Silva
2020-03-04 15:21   ` Frederic Barrat
2020-03-12  4:24     ` Alastair D'Silva
2020-03-05  3:11   ` Andrew Donnellan
2020-03-12  4:58     ` Alastair D'Silva
2020-02-21  3:27 ` [PATCH v3 24/27] powerpc/powernv/pmem: Expose SMART data via ndctl Alastair D'Silva
2020-03-04 15:40   ` Frederic Barrat
2020-03-05  3:36   ` Andrew Donnellan
2020-03-12 23:14     ` Alastair D'Silva
2020-02-21  3:27 ` [PATCH v3 25/27] powerpc/powernv/pmem: Expose the serial number in sysfs Alastair D'Silva
2020-02-28  6:25   ` Andrew Donnellan
2020-02-28  7:15     ` Greg Kroah-Hartman
2020-03-01 23:42       ` Alastair D'Silva
2020-03-02  5:38         ` Alastair D'Silva
2020-02-21  3:27 ` [PATCH v3 26/27] powerpc/powernv/pmem: Expose the firmware version " Alastair D'Silva
2020-03-02  7:35   ` Andrew Donnellan
2020-03-04  4:11     ` Alastair D'Silva
2020-02-21  3:27 ` [PATCH v3 27/27] MAINTAINERS: Add myself & nvdimm/ocxl to ocxl Alastair D'Silva
2020-02-21  5:35   ` Andrew Donnellan
2020-02-21 16:21 ` [PATCH v3 00/27] Add support for OpenCAPI Persistent Memory devices Dan Williams
2020-02-21 16:24   ` Dan Williams
2020-02-24  4:34   ` Alastair D'Silva
2020-02-24  4:37     ` Matthew Wilcox
2020-02-24  4:42       ` Alastair D'Silva
2020-02-24  6:51         ` Oliver O'Halloran
2020-02-26  0:13           ` Alastair D'Silva
2020-02-26  0:32             ` Dan Williams
2020-02-26  0:35               ` Alastair D'Silva

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