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Subject[PATCH v4 22/25] nvdimm/ocxl: Add debug IOCTLs
Date
These IOCTLs provide low level access to the card to aid in debugging
controller/FPGA firmware.

Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
---
drivers/nvdimm/ocxl/Kconfig | 6 +
drivers/nvdimm/ocxl/main.c | 198 +++++++++++++++++++++++++++++++++
drivers/nvdimm/ocxl/ocxlpmem.h | 2 +-
include/uapi/nvdimm/ocxlpmem.h | 31 ++++++
4 files changed, 236 insertions(+), 1 deletion(-)

diff --git a/drivers/nvdimm/ocxl/Kconfig b/drivers/nvdimm/ocxl/Kconfig
index c5d927520920..3f44429d70c9 100644
--- a/drivers/nvdimm/ocxl/Kconfig
+++ b/drivers/nvdimm/ocxl/Kconfig
@@ -12,4 +12,10 @@ config OCXL_PMEM

Select N if unsure.

+config OCXL_PMEM_DEBUG
+ bool "OpenCAPI Persistent Memory debugging"
+ depends on OCXL_PMEM
+ help
+ Enables low level IOCTLs for OpenCAPI Persistent Memory firmware development
+
endif
diff --git a/drivers/nvdimm/ocxl/main.c b/drivers/nvdimm/ocxl/main.c
index 2fbe3f2f77d9..2811bf7efbab 100644
--- a/drivers/nvdimm/ocxl/main.c
+++ b/drivers/nvdimm/ocxl/main.c
@@ -1027,6 +1027,183 @@ int req_controller_health_perf(struct ocxlpmem *ocxlpmem)
GLOBAL_MMIO_HCI_REQ_HEALTH_PERF);
}

+#ifdef CONFIG_OCXL_PMEM_DEBUG
+/**
+ * enable_fwdebug() - Enable FW debug on the controller
+ * @ocxlpmem: the device metadata
+ * Return: 0 on success, negative on failure
+ */
+static int enable_fwdebug(const struct ocxlpmem *ocxlpmem)
+{
+ return ocxl_global_mmio_set64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_HCI,
+ OCXL_LITTLE_ENDIAN,
+ GLOBAL_MMIO_HCI_FW_DEBUG);
+}
+
+/**
+ * disable_fwdebug() - Disable FW debug on the controller
+ * @ocxlpmem: the device metadata
+ * Return: 0 on success, negative on failure
+ */
+static int disable_fwdebug(const struct ocxlpmem *ocxlpmem)
+{
+ return ocxl_global_mmio_set64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_HCIC,
+ OCXL_LITTLE_ENDIAN,
+ GLOBAL_MMIO_HCI_FW_DEBUG);
+}
+
+static int ioctl_fwdebug(struct ocxlpmem *ocxlpmem,
+ struct ioctl_ocxl_pmem_fwdebug __user *uarg)
+{
+ struct ioctl_ocxl_pmem_fwdebug args;
+ u64 val;
+ int i;
+ int rc;
+
+ if (copy_from_user(&args, uarg, sizeof(args)))
+ return -EFAULT;
+
+ // Buffer size must be a multiple of 8
+ if ((args.buf_size & 0x07))
+ return -EINVAL;
+
+ if (args.buf_size > ocxlpmem->admin_command.data_size)
+ return -EINVAL;
+
+ mutex_lock(&ocxlpmem->admin_command.lock);
+
+ rc = enable_fwdebug(ocxlpmem);
+ if (rc)
+ goto out;
+
+ // Write DebugAction & FunctionCode
+ val = ((u64)args.debug_action << 56) | ((u64)args.function_code << 40);
+
+ rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.request_offset + 0x08,
+ OCXL_LITTLE_ENDIAN, val);
+ if (rc)
+ goto out;
+
+ rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.request_offset + 0x10,
+ OCXL_LITTLE_ENDIAN,
+ args.debug_parameter_1);
+ if (rc)
+ goto out;
+
+ rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.request_offset + 0x18,
+ OCXL_LITTLE_ENDIAN,
+ args.debug_parameter_2);
+ if (rc)
+ goto out;
+
+ // Populate admin command buffer
+ if (args.buf_size) {
+ for (i = 0; i < args.buf_size; i += sizeof(u64)) {
+ u64 val;
+
+ if (copy_from_user(&val, &args.buf[i], sizeof(u64))) {
+ rc = -EFAULT;
+ goto out;
+ }
+
+ rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + i,
+ OCXL_HOST_ENDIAN, val);
+ if (rc)
+ goto out;
+ }
+ }
+
+ rc = admin_command_execute(ocxlpmem,
+ ocxlpmem->timeouts[ADMIN_COMMAND_FW_DEBUG]);
+ if (rc < 0)
+ goto out;
+ if (rc != STATUS_SUCCESS) {
+ warn_status(ocxlpmem, "Unexpected status from FW Debug", rc);
+ goto out;
+ }
+
+ if (args.buf_size) {
+ for (i = 0; i < args.buf_size; i += sizeof(u64)) {
+ u64 val;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + i,
+ OCXL_HOST_ENDIAN, &val);
+ if (rc)
+ goto out;
+
+ if (copy_to_user(&args.buf[i], &val, sizeof(u64))) {
+ rc = -EFAULT;
+ goto out;
+ }
+ }
+ }
+
+ rc = admin_response_handled(ocxlpmem);
+ if (rc)
+ goto out;
+
+ rc = disable_fwdebug(ocxlpmem);
+
+out:
+ mutex_unlock(&ocxlpmem->admin_command.lock);
+ return rc;
+}
+
+static int ioctl_shutdown(struct ocxlpmem *ocxlpmem)
+{
+ int rc;
+
+ mutex_lock(&ocxlpmem->admin_command.lock);
+
+ rc = admin_command_execute(ocxlpmem, ADMIN_COMMAND_SHUTDOWN);
+ if (rc)
+ goto out;
+
+ rc = admin_response_handled(ocxlpmem);
+
+out:
+ mutex_unlock(&ocxlpmem->admin_command.lock);
+ return rc;
+}
+
+static int ioctl_mmio_write(struct ocxlpmem *ocxlpmem,
+ struct ioctl_ocxl_pmem_mmio __user *uarg)
+{
+ struct scm_ioctl_mmio args;
+
+ if (copy_from_user(&args, uarg, sizeof(args)))
+ return -EFAULT;
+
+ return ocxl_global_mmio_write64(ocxlpmem->ocxl_afu, args.address,
+ OCXL_LITTLE_ENDIAN, args.val);
+}
+
+static int ioctl_mmio_read(struct ocxlpmem *ocxlpmem,
+ struct ioctl_ocxl_pmem_mmio __user *uarg)
+{
+ struct ioctl_ocxl_pmem_mmio args;
+ int rc;
+
+ if (copy_from_user(&args, uarg, sizeof(args)))
+ return -EFAULT;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, args.address,
+ OCXL_LITTLE_ENDIAN, &args.val);
+ if (rc)
+ return rc;
+
+ if (copy_to_user(uarg, &args, sizeof(args)))
+ return -EFAULT;
+
+ return 0;
+}
+#endif /* CONFIG_OCXL_PMEM_DEBUG */
+
static long file_ioctl(struct file *file, unsigned int cmd, unsigned long args)
{
struct ocxlpmem *ocxlpmem = file->private_data;
@@ -1068,6 +1245,27 @@ static long file_ioctl(struct file *file, unsigned int cmd, unsigned long args)
case IOCTL_OCXLPMEM_REQUEST_HEALTH:
rc = req_controller_health_perf(ocxlpmem);
break;
+
+#ifdef CONFIG_OCXL_PMEM_DEBUG
+ case IOCTL_OCXL_PMEM_FWDEBUG:
+ rc = ioctl_fwdebug(ocxlpmem,
+ (struct ioctl_ocxl_pmem_fwdebug __user *)args);
+ break;
+
+ case IOCTL_OCXL_PMEM_SHUTDOWN:
+ rc = ioctl_shutdown(ocxlpmem);
+ break;
+
+ case IOCTL_OCXL_PMEM_MMIO_WRITE:
+ rc = ioctl_mmio_write(ocxlpmem,
+ (struct ioctl_ocxl_pmem_mmio __user *)args);
+ break;
+
+ case IOCTL_OCXL_PMEM_MMIO_READ:
+ rc = ioctl_mmio_read(ocxlpmem,
+ (struct ioctl_ocxl_pmem_mmio __user *)args);
+ break;
+#endif
}

return rc;
diff --git a/drivers/nvdimm/ocxl/ocxlpmem.h b/drivers/nvdimm/ocxl/ocxlpmem.h
index 01721596f982..c8794e7775ec 100644
--- a/drivers/nvdimm/ocxl/ocxlpmem.h
+++ b/drivers/nvdimm/ocxl/ocxlpmem.h
@@ -158,7 +158,7 @@ int ocxlpmem_chi(const struct ocxlpmem *ocxlpmem, u64 *chi);
*
* @ocxlpmem: the device metadata
* @op_code: the code for the admin command
- * Returns 0 on success, -EINVAL for a bad op code, -EBUSY on timeout
+// * Returns 0 on success, -EINVAL for a bad op code, -EBUSY on timeout
*/
int admin_command_execute(struct ocxlpmem *ocxlpmem, u8 op_code);

diff --git a/include/uapi/nvdimm/ocxlpmem.h b/include/uapi/nvdimm/ocxlpmem.h
index 9c5c8585c1c2..374b70690b3a 100644
--- a/include/uapi/nvdimm/ocxlpmem.h
+++ b/include/uapi/nvdimm/ocxlpmem.h
@@ -93,4 +93,35 @@ struct ioctl_ocxlpmem_eventfd {
#define IOCTL_OCXLPMEM_EVENT_CHECK _IOR(OCXLPMEM_MAGIC, 0x36, __u64)
#define IOCTL_OCXLPMEM_REQUEST_HEALTH _IO(OCXLPMEM_MAGIC, 0x37)

+/*
+ * Debug IOCTLs, these are only available if the kernel is compiled with
+ * CONFIG_OCXLPMEM_DEBUG
+ */
+
+#define OCXLPMEM_FWDEBUG_READ_CONTROLLER_MEMORY 0x01
+#define OCXLPMEM_FWDEBUG_WRITE_CONTROLLER_MEMORY 0x02
+#define OCXLPMEM_FWDEBUG_ENABLE_FUNCTION 0x03
+#define OCXLPMEM_FWDEBUG_DISABLE_FUNCTION 0x04
+#define OCXLPMEM_FWDEBUG_GET_PEL 0x05 /* Retrieve Persistent Error Log */
+
+struct ioctl_ocxlpmem_fwdebug { /* All args are inputs */
+ __u64 debug_parameter_1;
+ __u64 debug_parameter_2;
+ __u64 buf; /* Coerced pointer to optional in/out data buffer */
+ __u16 debug_action; /* OCXLPMEM_FWDEBUG_... */
+ __u16 function_code;
+ __u16 buf_size; /* Size of optional data buffer */
+ __u16 reserved;
+};
+
+struct ioctl_ocxlpmem_mmio {
+ __u64 address; /* Offset in global MMIO space */
+ __u64 val; /* value to write/was read */
+};
+
+#define IOCTL_OCXLPMEM_FWDEBUG _IOWR(OCXLPMEM_MAGIC, 0xf0, struct ioctl_ocxlpmem_fwdebug)
+#define IOCTL_OCXLPMEM_MMIO_WRITE _IOW(OCXLPMEM_MAGIC, 0xf1, struct ioctl_ocxlpmem_mmio)
+#define IOCTL_OCXLPMEM_MMIO_READ _IOWR(OCXLPMEM_MAGIC, 0xf2, struct ioctl_ocxlpmem_mmio)
+#define IOCTL_OCXLPMEM_SHUTDOWN _IO(OCXLPMEM_MAGIC, 0xf3)
+
#endif /* _UAPI_OCXL_SCM_H */
--
2.24.1
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