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From: "Alastair D'Silva" <alastair@au1.ibm.com>
To: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
Cc: "Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
	"Paul Mackerras" <paulus@samba.org>,
	"Michael Ellerman" <mpe@ellerman.id.au>,
	"Frederic Barrat" <fbarrat@linux.ibm.com>,
	"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, linuxppc-dev@lists.ozlabs.org,
	linux-nvdimm@lists.01.org, linux-mm@kvack.org
Subject: RE: [PATCH v2 13/27] nvdimm/ocxl: Add support for Admin commands
Date: Wed, 19 Feb 2020 16:00:57 +1100
Message-ID: <6d41f1e365960f3b3f8779ca117868c4d8508489.camel@au1.ibm.com> (raw)
In-Reply-To: <20200203141846.00004981@Huawei.com>

On Mon, 2020-02-03 at 14:18 +0000, Jonathan Cameron wrote:
> On Tue, 3 Dec 2019 14:46:41 +1100
> Alastair D'Silva <alastair@au1.ibm.com> wrote:
> 
> > From: Alastair D'Silva <alastair@d-silva.org>
> > 
> > This patch requests the metadata required to issue admin commands,
> > as well
> > as some helper functions to construct and check the completion of
> > the
> > commands.
> > 
> > Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
> 
> A few trivial bits inline.
> 
> Jonathan
> 
> > ---
> >  drivers/nvdimm/ocxl/scm.c          |  67 +++++++++++++
> >  drivers/nvdimm/ocxl/scm_internal.c | 152
> > +++++++++++++++++++++++++++++
> >  drivers/nvdimm/ocxl/scm_internal.h |  62 ++++++++++++
> >  3 files changed, 281 insertions(+)
> > 
> > diff --git a/drivers/nvdimm/ocxl/scm.c b/drivers/nvdimm/ocxl/scm.c
> > index 8088f65c289e..1e175f3c3cf2 100644
> > --- a/drivers/nvdimm/ocxl/scm.c
> > +++ b/drivers/nvdimm/ocxl/scm.c
> > @@ -267,6 +267,58 @@ static int scm_register_lpc_mem(struct
> > scm_data *scm_data)
> >  	return 0;
> >  }
> >  
> > +/**
> > + * scm_extract_command_metadata() - Extract command data from MMIO
> > & save it for further use
> > + * @scm_data: a pointer to the SCM device data
> > + * @offset: The base address of the command data structures
> > (address of CREQO)
> > + * @command_metadata: A pointer to the command metadata to
> > populate
> > + * Return: 0 on success, negative on failure
> > + */
> > +static int scm_extract_command_metadata(struct scm_data *scm_data,
> > u32 offset,
> > +					struct command_metadata
> > *command_metadata)
> > +{
> > +	int rc;
> > +	u64 tmp;
> > +
> > +	rc = ocxl_global_mmio_read64(scm_data->ocxl_afu, offset,
> > OCXL_LITTLE_ENDIAN,
> > +				     &tmp);
> > +	if (rc)
> > +		return rc;
> > +
> > +	command_metadata->request_offset = tmp >> 32;
> > +	command_metadata->response_offset = tmp & 0xFFFFFFFF;
> > +
> > +	rc = ocxl_global_mmio_read64(scm_data->ocxl_afu, offset + 8,
> > OCXL_LITTLE_ENDIAN,
> > +				     &tmp);
> > +	if (rc)
> > +		return rc;
> > +
> > +	command_metadata->data_offset = tmp >> 32;
> > +	command_metadata->data_size = tmp & 0xFFFFFFFF;
> > +
> > +	command_metadata->id = 0;
> > +
> > +	return 0;
> > +}
> > +
> > +/**
> > + * scm_setup_command_metadata() - Set up the command metadata
> > + * @scm_data: a pointer to the SCM device data
> > + */
> > +static int scm_setup_command_metadata(struct scm_data *scm_data)
> > +{
> > +	int rc;
> > +
> > +	mutex_init(&scm_data->admin_command.lock);
> > +
> > +	rc = scm_extract_command_metadata(scm_data,
> > GLOBAL_MMIO_ACMA_CREQO,
> > +					  &scm_data->admin_command);
> > +	if (rc)
> > +		return rc;
> 
> Unless you are adding to this later in the series.
> 

Ignored

> 	return scm_extract_command_metadata(scm_data,...)
> 
> > +
> > +	return 0;
> > +}
> > +
> >  /**
> >   * scm_is_usable() - Is a controller usable?
> >   * @scm_data: a pointer to the SCM device data
> > @@ -276,6 +328,8 @@ static bool scm_is_usable(const struct scm_data
> > *scm_data)
> >  {
> >  	u64 chi = 0;
> >  	int rc = scm_chi(scm_data, &chi);
> > +	if (rc)
> > +		return false;
> >  
> >  	if (!(chi & GLOBAL_MMIO_CHI_CRDY)) {
> >  		dev_err(&scm_data->dev, "SCM controller is not
> > ready.\n");
> > @@ -502,6 +556,14 @@ static int scm_probe(struct pci_dev *pdev,
> > const struct pci_device_id *ent)
> >  	}
> >  	scm_data->pdev = pdev;
> >  
> > +	scm_data->timeouts[ADMIN_COMMAND_ERRLOG] = 2000; // ms
> > +	scm_data->timeouts[ADMIN_COMMAND_HEARTBEAT] = 100; // ms
> > +	scm_data->timeouts[ADMIN_COMMAND_SMART] = 100; // ms
> > +	scm_data->timeouts[ADMIN_COMMAND_CONTROLLER_DUMP] = 1000; // ms
> > +	scm_data->timeouts[ADMIN_COMMAND_CONTROLLER_STATS] = 100; // ms
> > +	scm_data->timeouts[ADMIN_COMMAND_SHUTDOWN] = 1000; // ms
> > +	scm_data->timeouts[ADMIN_COMMAND_FW_UPDATE] = 16000; // ms
> > +
> >  	pci_set_drvdata(pdev, scm_data);
> >  
> >  	scm_data->ocxl_fn = ocxl_function_open(pdev);
> > @@ -543,6 +605,11 @@ static int scm_probe(struct pci_dev *pdev,
> > const struct pci_device_id *ent)
> >  		goto err;
> >  	}
> >  
> > +	if (scm_setup_command_metadata(scm_data)) {
> > +		dev_err(&pdev->dev, "Could not read OCXL command
> > matada\n");
> > +		goto err;
> > +	}
> > +
> >  	elapsed = 0;
> >  	timeout = scm_data->readiness_timeout + scm_data-
> > >memory_available_timeout;
> >  	while (!scm_is_usable(scm_data)) {
> > diff --git a/drivers/nvdimm/ocxl/scm_internal.c
> > b/drivers/nvdimm/ocxl/scm_internal.c
> > index 72d3c0e7d846..7b11b56863fb 100644
> > --- a/drivers/nvdimm/ocxl/scm_internal.c
> > +++ b/drivers/nvdimm/ocxl/scm_internal.c
> > @@ -17,3 +17,155 @@ int scm_chi(const struct scm_data *scm_data,
> > u64 *chi)
> >  
> >  	return 0;
> >  }
> > +
> > +static int scm_command_request(const struct scm_data *scm_data,
> > +			       struct command_metadata *cmd, u8
> > op_code)
> > +{
> > +	u64 val = op_code;
> > +	int rc;
> > +	u8 i;
> > +
> > +	cmd->op_code = op_code;
> > +	cmd->id++;
> > +
> > +	val |= ((u64)cmd->id) << 16;
> > +
> > +	rc = ocxl_global_mmio_write64(scm_data->ocxl_afu, cmd-
> > >request_offset,
> > +				      OCXL_LITTLE_ENDIAN, val);
> > +	if (rc)
> > +		return rc;
> > +
> > +	for (i = 0x08; i <= 0x38; i += 0x08) {
> 
> perhaps use sizeof(u64) to explain where the 0x08s come from.
> For the 0x38, might be worth a define.

Ok
> 
> > +		rc = ocxl_global_mmio_write64(scm_data->ocxl_afu,
> > +					      cmd->request_offset + i,
> > +					      OCXL_LITTLE_ENDIAN, 0);
> > +		if (rc)
> > +			return rc;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +int scm_admin_command_request(struct scm_data *scm_data, u8
> > op_code)
> > +{
> > +	u64 val;
> > +	int rc = ocxl_global_mmio_read64(scm_data->ocxl_afu,
> > GLOBAL_MMIO_CHI,
> > +					 OCXL_LITTLE_ENDIAN, &val);
> > +	if (rc)
> > +		return rc;
> > +
> > +	return scm_command_request(scm_data, &scm_data->admin_command,
> > op_code);
> > +}
> > +
> > +static int scm_command_response(const struct scm_data *scm_data,
> > +			 const struct command_metadata *cmd)
> > +{
> > +	u64 val;
> > +	u16 id;
> > +	u8 status;
> > +	int rc = ocxl_global_mmio_read64(scm_data->ocxl_afu,
> > +					 cmd->response_offset,
> > +					 OCXL_LITTLE_ENDIAN, &val);
> > +	if (rc)
> > +		return rc;
> > +
> > +	status = val & 0xff;
> > +	id = (val >> 16) & 0xffff;
> > +
> > +	if (id != cmd->id) {
> > +		dev_warn(&scm_data->dev,
> > +			 "Expected response for command %d, but
> > received response for command %d instead.\n",
> > +			 cmd->id, id);
> > +	}
> > +
> > +	return status;
> > +}
> > +
> > +int scm_admin_response(const struct scm_data *scm_data)
> > +{
> > +	return scm_command_response(scm_data, &scm_data-
> > >admin_command);
> > +}
> > +
> > +
> > +int scm_admin_command_execute(const struct scm_data *scm_data)
> > +{
> > +	return ocxl_global_mmio_set64(scm_data->ocxl_afu,
> > GLOBAL_MMIO_HCI,
> > +				      OCXL_LITTLE_ENDIAN,
> > GLOBAL_MMIO_HCI_ACRW);
> > +}
> > +
> > +static bool scm_admin_command_complete(const struct scm_data
> > *scm_data)
> > +{
> > +	u64 val = 0;
> > +
> > +	int rc = scm_chi(scm_data, &val);
> > +
> > +	WARN_ON(rc);
> > +
> > +	return (val & GLOBAL_MMIO_CHI_ACRA) != 0;
> > +}
> > +
> > +int scm_admin_command_complete_timeout(const struct scm_data
> > *scm_data,
> > +				       int command)
> > +{
> > +	u32 timeout = scm_data->timeouts[command];
> > +	// 32 is the next power of 2 greater than the 20ms minimum for
> > msleep
> > +#define TIMEOUT_SLEEP_MILLIS 32
> > +	timeout /= TIMEOUT_SLEEP_MILLIS;
> > +	if (!timeout)
> > +		timeout = SCM_DEFAULT_TIMEOUT / TIMEOUT_SLEEP_MILLIS;
> > +
> > +	while (timeout-- > 0) {
> > +		if (scm_admin_command_complete(scm_data))
> > +			return 0;
> > +		msleep(TIMEOUT_SLEEP_MILLIS);
> > +	}
> > +
> > +	if (scm_admin_command_complete(scm_data))
> > +		return 0;
> > +
> > +	return -EBUSY;
> > +}
> > +
> > +int scm_admin_response_handled(const struct scm_data *scm_data)
> > +{
> > +	return ocxl_global_mmio_set64(scm_data->ocxl_afu,
> > GLOBAL_MMIO_CHIC,
> > +				      OCXL_LITTLE_ENDIAN,
> > GLOBAL_MMIO_CHI_ACRA);
> > +}
> > +
> > +void scm_warn_status(const struct scm_data *scm_data, const char
> > *message,
> > +		     u8 status)
> > +{
> > +	const char *text = "Unknown";
> > +
> > +	switch (status) {
> > +	case STATUS_SUCCESS:
> > +		text = "Success";
> > +		break;
> > +
> > +	case STATUS_MEM_UNAVAILABLE:
> > +		text = "Persistent memory unavailable";
> > +		break;
> > +
> > +	case STATUS_BAD_OPCODE:
> > +		text = "Bad opcode";
> > +		break;
> > +
> > +	case STATUS_BAD_REQUEST_PARM:
> > +		text = "Bad request parameter";
> > +		break;
> > +
> > +	case STATUS_BAD_DATA_PARM:
> > +		text = "Bad data parameter";
> > +		break;
> > +
> > +	case STATUS_DEBUG_BLOCKED:
> > +		text = "Debug action blocked";
> > +		break;
> > +
> > +	case STATUS_FAIL:
> > +		text = "Failed";
> > +		break;
> > +	}
> > +
> > +	dev_warn(&scm_data->dev, "%s: %s (%x)\n", message, text,
> > status);
> > +}
> > diff --git a/drivers/nvdimm/ocxl/scm_internal.h
> > b/drivers/nvdimm/ocxl/scm_internal.h
> > index 584450f55e30..9bff684cd069 100644
> > --- a/drivers/nvdimm/ocxl/scm_internal.h
> > +++ b/drivers/nvdimm/ocxl/scm_internal.h
> > @@ -6,6 +6,8 @@
> >  #include <linux/libnvdimm.h>
> >  #include <linux/mm.h>
> >  
> > +#define SCM_DEFAULT_TIMEOUT 100
> > +
> >  #define GLOBAL_MMIO_CHI		0x000
> >  #define GLOBAL_MMIO_CHIC	0x008
> >  #define GLOBAL_MMIO_CHIE	0x010
> > @@ -80,6 +82,16 @@
> >  
> >  #define SCM_LABEL_AREA_SIZE	(1UL << PA_SECTION_SHIFT)
> >  
> > +struct command_metadata {
> > +	u32 request_offset;
> > +	u32 response_offset;
> > +	u32 data_offset;
> > +	u32 data_size;
> > +	struct mutex lock;
> > +	u16 id;
> > +	u8 op_code;
> > +};
> > +
> >  struct scm_function_0 {
> >  	struct pci_dev *pdev;
> >  	struct ocxl_fn *ocxl_fn;
> > @@ -95,9 +107,11 @@ struct scm_data {
> >  	struct ocxl_afu *ocxl_afu;
> >  	struct ocxl_context *ocxl_context;
> >  	void *metadata_addr;
> > +	struct command_metadata admin_command;
> >  	struct resource scm_res;
> >  	struct nd_region *nd_region;
> >  	char fw_version[8+1];
> > +	u32 timeouts[ADMIN_COMMAND_MAX+1];
> >  
> >  	u32 max_controller_dump_size;
> >  	u16 scm_revision; // major/minor
> > @@ -122,3 +136,51 @@ struct scm_data {
> >   * Returns 0 on success, negative on error
> >   */
> >  int scm_chi(const struct scm_data *scm_data, u64 *chi);
> > +
> > +/**
> > + * scm_admin_command_request() - Issue an admin command request
> > + * @scm_data: a pointer to the SCM device data
> > + * @op_code: The op-code for the command
> > + *
> > + * Returns an identifier for the command, or negative on error
> > + */
> > +int scm_admin_command_request(struct scm_data *scm_data, u8
> > op_code);
> > +
> > +/**
> > + * scm_admin_response() - Validate an admin response
> > + * @scm_data: a pointer to the SCM device data
> > + * Returns the status code of the command, or negative on error
> > + */
> > +int scm_admin_response(const struct scm_data *scm_data);
> > +
> > +/**
> > + * scm_admin_command_execute() - Notify the controller to start
> > processing a pending admin command
> > + * @scm_data: a pointer to the SCM device data
> > + * Returns 0 on success, negative on error
> > + */
> > +int scm_admin_command_execute(const struct scm_data *scm_data);
> > +
> > +/**
> > + * scm_admin_command_complete_timeout() - Wait for an admin
> > command to finish executing
> > + * @scm_data: a pointer to the SCM device data
> > + * @command: the admin command to wait for completion (determines
> > the timeout)
> > + * Returns 0 on success, -EBUSY on timeout
> > + */
> > +int scm_admin_command_complete_timeout(const struct scm_data
> > *scm_data,
> > +				       int command);
> > +
> > +/**
> > + * scm_admin_response_handled() - Notify the controller that the
> > admin response has been handled
> > + * @scm_data: a pointer to the SCM device data
> > + * Returns 0 on success, negative on failure
> > + */
> > +int scm_admin_response_handled(const struct scm_data *scm_data);
> > +
> > +/**
> > + * scm_warn_status() - Emit a kernel warning showing a command
> > status.
> > + * @scm_data: a pointer to the SCM device data
> > + * @message: A message to accompany the warning
> > + * @status: The command status
> > + */
> > +void scm_warn_status(const struct scm_data *scm_data, const char
> > *message,
> > +		     u8 status);
-- 
Alastair D'Silva
Open Source Developer
Linux Technology Centre, IBM Australia
mob: 0423 762 819
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  reply index

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-03  3:46 [PATCH v2 00/27] Add support for OpenCAPI SCM devices Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 01/27] memory_hotplug: Add a bounds check to __add_pages Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 02/27] nvdimm: remove prototypes for nonexistent functions Alastair D'Silva
2019-12-03  4:47   ` Andrew Donnellan
2019-12-04  0:10   ` Dan Williams
2020-01-23 21:49     ` Dan Williams
2019-12-03  3:46 ` [PATCH v2 03/27] powerpc: Add OPAL calls for LPC memory alloc/release Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 04/27] mm/memory_hotplug: Allow check_hotplug_memory_addressable to be called from drivers Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 05/27] powerpc: Map & release OpenCAPI LPC memory Alastair D'Silva
2020-01-09 14:41   ` Frederic Barrat
2020-01-21  6:46   ` Andrew Donnellan
2020-01-21  7:11     ` Greg Kurz
2020-02-14 11:09   ` Frederic Barrat
2020-02-18 23:44     ` Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 06/27] ocxl: Tally up the LPC memory on a link & allow it to be mapped Alastair D'Silva
2020-01-09 14:48   ` Frederic Barrat
2020-02-03 12:37   ` Jonathan Cameron
2020-02-19  0:01     ` Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 07/27] ocxl: Add functions to map/unmap LPC memory Alastair D'Silva
2020-01-09 14:49   ` Frederic Barrat
2020-02-03 12:49   ` Jonathan Cameron
2020-02-19  2:39     ` Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 08/27] ocxl: Save the device serial number in ocxl_fn Alastair D'Silva
2020-02-03 12:53   ` Jonathan Cameron
2020-02-19  4:03     ` Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 09/27] ocxl: Free detached contexts in ocxl_context_detach_all() Alastair D'Silva
2020-01-09 14:54   ` Frederic Barrat
2019-12-03  3:46 ` [PATCH v2 10/27] nvdimm: Add driver for OpenCAPI Storage Class Memory Alastair D'Silva
2019-12-03  5:05   ` Alastair D'Silva
2020-02-03 13:20   ` Jonathan Cameron
2020-02-19  4:40     ` Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 11/27] nvdimm/ocxl: Add register addresses & status values to header Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 12/27] nvdimm/ocxl: Read the capability registers & wait for device ready Alastair D'Silva
2020-02-03 13:23   ` Jonathan Cameron
2020-02-19  4:46     ` Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 13/27] nvdimm/ocxl: Add support for Admin commands Alastair D'Silva
2020-02-03 14:18   ` Jonathan Cameron
2020-02-19  5:00     ` Alastair D'Silva [this message]
2019-12-03  3:46 ` [PATCH v2 14/27] nvdimm/ocxl: Add support for near storage commands Alastair D'Silva
2020-02-03 14:22   ` Jonathan Cameron
2020-02-19  4:54     ` Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 15/27] nvdimm/ocxl: Register a character device for userspace to interact with Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 16/27] nvdimm/ocxl: Implement the Read Error Log command Alastair D'Silva
2019-12-05  3:42   ` Alastair D'Silva
2019-12-05 19:34   ` kbuild test robot
2019-12-03  3:46 ` [PATCH v2 17/27] nvdimm/ocxl: Add controller dump IOCTLs Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 18/27] nvdimm/ocxl: Add an IOCTL to report controller statistics Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 19/27] nvdimm/ocxl: Forward events to userspace Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 20/27] nvdimm/ocxl: Add an IOCTL to request controller health & perf data Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 21/27] nvdimm/ocxl: Support firmware update via sysfs Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 22/27] nvdimm/ocxl: Implement the heartbeat command Alastair D'Silva
2020-02-03 15:11   ` Jonathan Cameron
2020-02-19  5:02     ` Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 23/27] nvdimm/ocxl: Add debug IOCTLs Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 24/27] nvdimm/ocxl: Implement Overwrite Alastair D'Silva
2020-02-03 15:10   ` Jonathan Cameron
2020-02-19  5:13     ` Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 25/27] nvdimm/ocxl: Expose SMART data via ndctl Alastair D'Silva
2019-12-16  0:15   ` Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 26/27] powerpc: Enable OpenCAPI Storage Class Memory driver on bare metal Alastair D'Silva
2019-12-03  4:54   ` Andrew Donnellan
2019-12-03  4:57     ` Alastair D'Silva
2019-12-03  3:46 ` [PATCH v2 27/27] MAINTAINERS: Add myself & nvdimm/ocxl to ocxl Alastair D'Silva
2019-12-03  3:50 ` [PATCH v2 00/27] Add support for OpenCAPI SCM devices Matthew Wilcox
2019-12-03  4:01   ` Alastair D'Silva
2019-12-03 12:42     ` Matthew Wilcox
2019-12-04  0:15       ` Dan Williams

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