From: Frederic Barrat <fbarrat@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>,
"Oliver O'Halloran" <oohall@gmail.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>,
"Dan Williams" <dan.j.williams@intel.com>,
"Vishal Verma" <vishal.l.verma@intel.com>,
"Dave Jiang" <dave.jiang@intel.com>,
"Ira Weiny" <ira.weiny@intel.com>,
"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, linuxppc-dev@lists.ozlabs.org,
linux-nvdimm@lists.01.org, linux-mm@kvack.org
Subject: Re: [PATCH v3 13/27] powerpc/powernv/pmem: Read the capability registers & wait for device ready
Date: Mon, 2 Mar 2020 18:51:07 +0100 [thread overview]
Message-ID: <3d2de7c1-ee95-ed6c-0346-4a1d20a0b75e@linux.ibm.com> (raw)
In-Reply-To: <20200221032720.33893-14-alastair@au1.ibm.com>
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
> + 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.
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);
>
next prev parent reply other threads:[~2020-03-02 17:51 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 [this message]
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
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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