From: "Alastair D'Silva" <alastair@au1.ibm.com> To: alastair@d-silva.org 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@list Subject: [PATCH v2 13/27] nvdimm/ocxl: Add support for Admin commands Date: Tue, 3 Dec 2019 14:46:41 +1100 Message-ID: <20191203034655.51561-14-alastair@au1.ibm.com> (raw) In-Reply-To: <20191203034655.51561-1-alastair@au1.ibm.com> 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> --- 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; + + 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) { + 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); 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next prev parent 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 ` Alastair D'Silva [this message] 2020-02-03 14:18 ` [PATCH v2 13/27] nvdimm/ocxl: Add support for Admin commands Jonathan Cameron 2020-02-19 5:00 ` Alastair D'Silva 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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