[PATCH v3 14/27] powerpc/powernv/pmem: Add support for Admin commands

["Alastair D'Silva" <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>
---
 arch/powerpc/platforms/powernv/pmem/ocxl.c    |  65 ++++++++
 .../platforms/powernv/pmem/ocxl_internal.c    | 153 ++++++++++++++++++
 .../platforms/powernv/pmem/ocxl_internal.h    |  61 +++++++
 3 files changed, 279 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl.c b/arch/powerpc/platforms/powernv/pmem/ocxl.c
index 431212c9f0cc..4e782d22605b 100644
--- a/arch/powerpc/platforms/powernv/pmem/ocxl.c
+++ b/arch/powerpc/platforms/powernv/pmem/ocxl.c
@@ -216,6 +216,58 @@ static int register_lpc_mem(struct ocxlpmem *ocxlpmem)
 	return 0;
 }
 
+/**
+ * extract_command_metadata() - Extract command data from MMIO & save it for further use
+ * @ocxlpmem: the device metadata
+ * @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 extract_command_metadata(struct ocxlpmem *ocxlpmem, u32 offset,
+					struct command_metadata *command_metadata)
+{
+	int rc;
+	u64 tmp;
+
+	rc = ocxl_global_mmio_read64(ocxlpmem->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(ocxlpmem->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;
+}
+
+/**
+ * setup_command_metadata() - Set up the command metadata
+ * @ocxlpmem: the device metadata
+ */
+static int setup_command_metadata(struct ocxlpmem *ocxlpmem)
+{
+	int rc;
+
+	mutex_init(&ocxlpmem->admin_command.lock);
+
+	rc = extract_command_metadata(ocxlpmem, GLOBAL_MMIO_ACMA_CREQO,
+				      &ocxlpmem->admin_command);
+	if (rc)
+		return rc;
+
+	return 0;
+}
+
 /**
  * is_usable() - Is a controller usable?
  * @ocxlpmem: the device metadata
@@ -456,6 +508,14 @@ static int probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	}
 	ocxlpmem->pdev = pdev;
 
+	ocxlpmem->timeouts[ADMIN_COMMAND_ERRLOG] = 2000; // ms
+	ocxlpmem->timeouts[ADMIN_COMMAND_HEARTBEAT] = 100; // ms
+	ocxlpmem->timeouts[ADMIN_COMMAND_SMART] = 100; // ms
+	ocxlpmem->timeouts[ADMIN_COMMAND_CONTROLLER_DUMP] = 1000; // ms
+	ocxlpmem->timeouts[ADMIN_COMMAND_CONTROLLER_STATS] = 100; // ms
+	ocxlpmem->timeouts[ADMIN_COMMAND_SHUTDOWN] = 1000; // ms
+	ocxlpmem->timeouts[ADMIN_COMMAND_FW_UPDATE] = 16000; // ms
+
 	pci_set_drvdata(pdev, ocxlpmem);
 
 	ocxlpmem->ocxl_fn = ocxl_function_open(pdev);
@@ -501,6 +561,11 @@ static int probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		goto err;
 	}
 
+	if (setup_command_metadata(ocxlpmem)) {
+		dev_err(&pdev->dev, "Could not read OCXL command matada\n");
+		goto err;
+	}
+
 	elapsed = 0;
 	timeout = ocxlpmem->readiness_timeout + ocxlpmem->memory_available_timeout;
 	while (!is_usable(ocxlpmem, false)) {
diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.c b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.c
index 617ca943b1b8..583f48023025 100644
--- a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.c
+++ b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.c
@@ -17,3 +17,156 @@ int ocxlpmem_chi(const struct ocxlpmem *ocxlpmem, u64 *chi)
 
 	return 0;
 }
+
+#define COMMAND_REQUEST_SIZE (8 * sizeof(u64))
+static int scm_command_request(const struct ocxlpmem *ocxlpmem,
+			       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(ocxlpmem->ocxl_afu, cmd->request_offset,
+				      OCXL_LITTLE_ENDIAN, val);
+	if (rc)
+		return rc;
+
+	for (i = sizeof(u64); i < COMMAND_REQUEST_SIZE; i += sizeof(u64)) {
+		rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu,
+					      cmd->request_offset + i,
+					      OCXL_LITTLE_ENDIAN, 0);
+		if (rc)
+			return rc;
+	}
+
+	return 0;
+}
+
+int admin_command_request(struct ocxlpmem *ocxlpmem, u8 op_code)
+{
+	u64 val;
+	int rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_CHI,
+					 OCXL_LITTLE_ENDIAN, &val);
+	if (rc)
+		return rc;
+
+	return scm_command_request(ocxlpmem, &ocxlpmem->admin_command, op_code);
+}
+
+static int command_response(const struct ocxlpmem *ocxlpmem,
+			    const struct command_metadata *cmd)
+{
+	u64 val;
+	u16 id;
+	u8 status;
+	int rc = ocxl_global_mmio_read64(ocxlpmem->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(&ocxlpmem->dev,
+			 "Expected response for command %d, but received response for command %d instead.\n",
+			 cmd->id, id);
+	}
+
+	return status;
+}
+
+int admin_response(const struct ocxlpmem *ocxlpmem)
+{
+	return command_response(ocxlpmem, &ocxlpmem->admin_command);
+}
+
+
+int admin_command_execute(const struct ocxlpmem *ocxlpmem)
+{
+	return ocxl_global_mmio_set64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_HCI,
+				      OCXL_LITTLE_ENDIAN, GLOBAL_MMIO_HCI_ACRW);
+}
+
+static bool admin_command_complete(const struct ocxlpmem *ocxlpmem)
+{
+	u64 val = 0;
+
+	int rc = ocxlpmem_chi(ocxlpmem, &val);
+
+	WARN_ON(rc);
+
+	return (val & GLOBAL_MMIO_CHI_ACRA) != 0;
+}
+
+int admin_command_complete_timeout(const struct ocxlpmem *ocxlpmem,
+				   int command)
+{
+	u32 timeout = ocxlpmem->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 = DEFAULT_TIMEOUT / TIMEOUT_SLEEP_MILLIS;
+
+	while (timeout-- > 0) {
+		if (admin_command_complete(ocxlpmem))
+			return 0;
+		msleep(TIMEOUT_SLEEP_MILLIS);
+	}
+
+	if (admin_command_complete(ocxlpmem))
+		return 0;
+
+	return -EBUSY;
+}
+
+int admin_response_handled(const struct ocxlpmem *ocxlpmem)
+{
+	return ocxl_global_mmio_set64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_CHIC,
+				      OCXL_LITTLE_ENDIAN, GLOBAL_MMIO_CHI_ACRA);
+}
+
+void warn_status(const struct ocxlpmem *ocxlpmem, 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(&ocxlpmem->dev, "%s: %s (%x)\n", message, text, status);
+}
diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
index ba0301533d00..2fef68c71271 100644
--- a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
+++ b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
@@ -7,6 +7,7 @@
 #include <linux/mm.h>
 
 #define LABEL_AREA_SIZE	(1UL << PA_SECTION_SHIFT)
+#define DEFAULT_TIMEOUT 100
 
 #define GLOBAL_MMIO_CHI		0x000
 #define GLOBAL_MMIO_CHIC	0x008
@@ -80,6 +81,16 @@
 #define STATUS_FW_ARG_INVALID	0x51
 #define STATUS_FW_INVALID	0x52
 
+struct command_metadata {
+	u32 request_offset;
+	u32 response_offset;
+	u32 data_offset;
+	u32 data_size;
+	struct mutex lock;
+	u16 id;
+	u8 op_code;
+};
+
 struct ocxlpmem_function0 {
 	struct pci_dev *pdev;
 	struct ocxl_fn *ocxl_fn;
@@ -95,9 +106,11 @@ struct ocxlpmem {
 	struct ocxl_afu *ocxl_afu;
 	struct ocxl_context *ocxl_context;
 	void *metadata_addr;
+	struct command_metadata admin_command;
 	struct resource pmem_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 +135,51 @@ struct ocxlpmem {
  * Returns 0 on success, negative on error
  */
 int ocxlpmem_chi(const struct ocxlpmem *ocxlpmem, u64 *chi);
+
+/**
+ * admin_command_request() - Issue an admin command request
+ * @ocxlpmem: the device metadata
+ * @op_code: The op-code for the command
+ *
+ * Returns an identifier for the command, or negative on error
+ */
+int admin_command_request(struct ocxlpmem *ocxlpmem, u8 op_code);
+
+/**
+ * admin_response() - Validate an admin response
+ * @ocxlpmem: the device metadata
+ * Returns the status code of the command, or negative on error
+ */
+int admin_response(const struct ocxlpmem *ocxlpmem);
+
+/**
+ * admin_command_execute() - Notify the controller to start processing a pending admin command
+ * @ocxlpmem: the device metadata
+ * Returns 0 on success, negative on error
+ */
+int admin_command_execute(const struct ocxlpmem *ocxlpmem);
+
+/**
+ * admin_command_complete_timeout() - Wait for an admin command to finish executing
+ * @ocxlpmem: the device metadata
+ * @command: the admin command to wait for completion (determines the timeout)
+ * Returns 0 on success, -EBUSY on timeout
+ */
+int admin_command_complete_timeout(const struct ocxlpmem *ocxlpmem,
+				   int command);
+
+/**
+ * admin_response_handled() - Notify the controller that the admin response has been handled
+ * @ocxlpmem: the device metadata
+ * Returns 0 on success, negative on failure
+ */
+int admin_response_handled(const struct ocxlpmem *ocxlpmem);
+
+/**
+ * warn_status() - Emit a kernel warning showing a command status.
+ * @ocxlpmem: the device metadata
+ * @message: A message to accompany the warning
+ * @status: The command status
+ */
+void warn_status(const struct ocxlpmem *ocxlpmem, const char *message,
+		 u8 status);
-- 
2.24.1
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