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From: "Alastair D'Silva" <alastair@au1.ibm.com>
To: Frederic Barrat <fbarrat@linux.ibm.com>
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>,
	"Andrew Donnellan" <ajd@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 13/27] powerpc/powernv/pmem: Read the capability registers & wait for device ready
Date: Wed, 04 Mar 2020 15:15:53 +1100	[thread overview]
Message-ID: <b1157d7a777049d417818884eed5e027b1008f7e.camel@au1.ibm.com> (raw)
In-Reply-To: <3d2de7c1-ee95-ed6c-0346-4a1d20a0b75e@linux.ibm.com>

On Mon, 2020-03-02 at 18:51 +0100, Frederic Barrat wrote:
> 
> Le 21/02/2020 à 04:27, Alastair D'Silva a écrit :
> > From: Alastair D'Silva <alastair@d-silva.org>
> > 
> > This patch reads timeouts & firmware version from the controller,
> > and
> > uses those timeouts to wait for the controller to report that it is
> > ready
> > before handing the memory over to libnvdimm.
> > 
> > Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
> > ---
> >   arch/powerpc/platforms/powernv/pmem/Makefile  |  2 +-
> >   arch/powerpc/platforms/powernv/pmem/ocxl.c    | 92
> > +++++++++++++++++++
> >   .../platforms/powernv/pmem/ocxl_internal.c    | 19 ++++
> >   .../platforms/powernv/pmem/ocxl_internal.h    | 24 +++++
> >   4 files changed, 136 insertions(+), 1 deletion(-)
> >   create mode 100644
> > arch/powerpc/platforms/powernv/pmem/ocxl_internal.c
> > 
> > diff --git a/arch/powerpc/platforms/powernv/pmem/Makefile
> > b/arch/powerpc/platforms/powernv/pmem/Makefile
> > index 1c55c4193175..4ceda25907d4 100644
> > --- a/arch/powerpc/platforms/powernv/pmem/Makefile
> > +++ b/arch/powerpc/platforms/powernv/pmem/Makefile
> > @@ -4,4 +4,4 @@ ccflags-$(CONFIG_PPC_WERROR)	+= -Werror
> >   
> >   obj-$(CONFIG_OCXL_PMEM) += ocxlpmem.o
> >   
> > -ocxlpmem-y := ocxl.o
> > +ocxlpmem-y := ocxl.o ocxl_internal.o
> > diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl.c
> > b/arch/powerpc/platforms/powernv/pmem/ocxl.c
> > index 3c4eeb5dcc0f..431212c9f0cc 100644
> > --- a/arch/powerpc/platforms/powernv/pmem/ocxl.c
> > +++ b/arch/powerpc/platforms/powernv/pmem/ocxl.c
> > @@ -8,6 +8,7 @@
> >   
> >   #include <linux/module.h>
> >   #include <misc/ocxl.h>
> > +#include <linux/delay.h>
> >   #include <linux/ndctl.h>
> >   #include <linux/mm_types.h>
> >   #include <linux/memory_hotplug.h>
> > @@ -215,6 +216,36 @@ static int register_lpc_mem(struct ocxlpmem
> > *ocxlpmem)
> >   	return 0;
> >   }
> >   
> > +/**
> > + * is_usable() - Is a controller usable?
> > + * @ocxlpmem: the device metadata
> > + * @verbose: True to log errors
> > + * Return: true if the controller is usable
> > + */
> > +static bool is_usable(const struct ocxlpmem *ocxlpmem, bool
> > verbose)
> > +{
> > +	u64 chi = 0;
> > +	int rc = ocxlpmem_chi(ocxlpmem, &chi);
> > +
> > +	if (rc < 0)
> > +		return false;
> > +
> > +	if (!(chi & GLOBAL_MMIO_CHI_CRDY)) {
> > +		if (verbose)
> > +			dev_err(&ocxlpmem->dev, "controller is not
> > ready.\n");
> > +		return false;
> > +	}
> > +
> > +	if (!(chi & GLOBAL_MMIO_CHI_MA)) {
> > +		if (verbose)
> > +			dev_err(&ocxlpmem->dev,
> > +				"controller does not have memory
> > available.\n");
> > +		return false;
> > +	}
> > +
> > +	return true;
> > +}
> > +
> >   /**
> >    * allocate_minor() - Allocate a minor number to use for an
> > OpenCAPI pmem device
> >    * @ocxlpmem: the device metadata
> > @@ -328,6 +359,48 @@ static void ocxlpmem_remove(struct pci_dev
> > *pdev)
> >   	}
> >   }
> >   
> > +/**
> > + * read_device_metadata() - Retrieve config information from the
> > AFU and save it for future use
> > + * @ocxlpmem: the device metadata
> > + * Return: 0 on success, negative on failure
> > + */
> > +static int read_device_metadata(struct ocxlpmem *ocxlpmem)
> > +{
> > +	u64 val;
> > +	int rc;
> > +
> > +	rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
> > GLOBAL_MMIO_CCAP0,
> > +				     OCXL_LITTLE_ENDIAN, &val);
> > +	if (rc)
> > +		return rc;
> > +
> > +	ocxlpmem->scm_revision = val & 0xFFFF;
> > +	ocxlpmem->read_latency = (val >> 32) & 0xFF;
> > +	ocxlpmem->readiness_timeout = (val >> 48) & 0x0F;
> > +	ocxlpmem->memory_available_timeout = val >> 52;
> > +
> > +	rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
> > GLOBAL_MMIO_CCAP1,
> > +				     OCXL_LITTLE_ENDIAN, &val);
> > +	if (rc)
> > +		return rc;
> > +
> > +	ocxlpmem->max_controller_dump_size = val & 0xFFFFFFFF;
> > +
> > +	// Extract firmware version text
> > +	rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
> > GLOBAL_MMIO_FWVER,
> > +				     OCXL_HOST_ENDIAN, (u64 *)ocxlpmem-
> > >fw_version);
> > +	if (rc)
> > +		return rc;
> > +
> > +	ocxlpmem->fw_version[8] = '\0';
> > +
> > +	dev_info(&ocxlpmem->dev,
> > +		 "Firmware version '%s' SCM revision %d:%d\n",
> > ocxlpmem->fw_version,
> > +		 ocxlpmem->scm_revision >> 4, ocxlpmem->scm_revision &
> > 0x0F);
> > +
> > +	return 0;
> > +}
> > +
> >   /**
> >    * 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,
> > @@ -368,6 +441,7 @@ static int probe(struct pci_dev *pdev, const
> > struct pci_device_id *ent)
> >   {
> >   	struct ocxlpmem *ocxlpmem;
> >   	int rc;
> > +	u16 elapsed, timeout;
> >   
> >   	if (PCI_FUNC(pdev->devfn) == 0)
> >   		return probe_function0(pdev);
> > @@ -422,6 +496,24 @@ static int probe(struct pci_dev *pdev, const
> > struct pci_device_id *ent)
> >   		goto err;
> >   	}
> >   
> > +	if (read_device_metadata(ocxlpmem)) {
> > +		dev_err(&pdev->dev, "Could not read metadata\n");
> 
> 
> Need to set rc
> 
> 
Whoops :)

> 
> > +		goto err;
> > +	}
> > +
> > +	elapsed = 0;
> > +	timeout = ocxlpmem->readiness_timeout + ocxlpmem-
> > >memory_available_timeout;
> > +	while (!is_usable(ocxlpmem, false)) {
> > +		if (elapsed++ > timeout) {
> > +			dev_warn(&ocxlpmem->dev, "OpenCAPI Persistent
> > Memory ready timeout.\n");
> > +			(void)is_usable(ocxlpmem, true);
> 
> I guess that extra call to is_usable() is just to log the cause of
> the 
> error. However, with some bad luck, the call could now succeed.
> 

Yeah, that's pretty ugly, I'll re-engineer it.

> 
>    Fred
> 
> 
> > +			rc = -ENXIO;
> > +			goto err;
> > +		}
> > +
> > +		msleep(1000);
> > +	}
> > +
> >   	rc = register_lpc_mem(ocxlpmem);
> >   	if (rc) {
> >   		dev_err(&pdev->dev, "Could not register OpenCAPI
> > persistent memory with libnvdimm\n");
> > diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.c
> > b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.c
> > new file mode 100644
> > index 000000000000..617ca943b1b8
> > --- /dev/null
> > +++ b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.c
> > @@ -0,0 +1,19 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +// Copyright 2019 IBM Corp.
> > +
> > +#include <misc/ocxl.h>
> > +#include <linux/delay.h>
> > +#include "ocxl_internal.h"
> > +
> > +int ocxlpmem_chi(const struct ocxlpmem *ocxlpmem, u64 *chi)
> > +{
> > +	u64 val;
> > +	int rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
> > GLOBAL_MMIO_CHI,
> > +					 OCXL_LITTLE_ENDIAN, &val);
> > +	if (rc)
> > +		return rc;
> > +
> > +	*chi = val;
> > +
> > +	return 0;
> > +}
> > diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
> > b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
> > index 9cf3e42750e7..ba0301533d00 100644
> > --- a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
> > +++ b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
> > @@ -97,4 +97,28 @@ struct ocxlpmem {
> >   	void *metadata_addr;
> >   	struct resource pmem_res;
> >   	struct nd_region *nd_region;
> > +	char fw_version[8+1];
> > +
> > +	u32 max_controller_dump_size;
> > +	u16 scm_revision; // major/minor
> > +	u8 readiness_timeout;  /* The worst case time (in seconds) that
> > the host shall
> > +				* wait for the controller to become
> > operational following a reset (CHI.CRDY).
> > +				*/
> > +	u8 memory_available_timeout;   /* The worst case time (in
> > seconds) that the host shall
> > +					* wait for memory to become
> > available following a reset (CHI.MA).
> > +					*/
> > +
> > +	u16 read_latency; /* The nominal measure of latency (in
> > nanoseconds)
> > +			   * associated with an unassisted read of a
> > memory block.
> > +			   * This represents the capability of the raw
> > media technology without assistance
> > +			   */
> >   };
> > +
> > +/**
> > + * ocxlpmem_chi() - Get the value of the CHI register
> > + * @ocxlpmem: the device metadata
> > + * @chi: returns the CHI value
> > + *
> > + * Returns 0 on success, negative on error
> > + */
> > +int ocxlpmem_chi(const struct ocxlpmem *ocxlpmem, u64 *chi);
> > 
-- 
Alastair D'Silva
Open Source Developer
Linux Technology Centre, IBM Australia
mob: 0423 762 819
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  reply	other threads:[~2020-03-04  4:16 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 [this message]
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
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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