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SubjectRe: [PATCH v3 18/27] powerpc/powernv/pmem: Add controller dump IOCTLs
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On 21/2/20 2:27 pm, Alastair D'Silva wrote:
> +static int ioctl_controller_dump_data(struct ocxlpmem *ocxlpmem,
> + struct ioctl_ocxl_pmem_controller_dump_data __user *uarg)
> +{
> + struct ioctl_ocxl_pmem_controller_dump_data args;
> + u16 i;
> + u64 val;
> + int rc;
> +
> + if (copy_from_user(&args, uarg, sizeof(args)))
> + return -EFAULT;
> +
> + if (args.buf_size % 8)
> + return -EINVAL;
> +
> + if (args.buf_size > ocxlpmem->admin_command.data_size)
> + return -EINVAL;
> +
> + mutex_lock(&ocxlpmem->admin_command.lock);
> +
> + rc = admin_command_request(ocxlpmem, ADMIN_COMMAND_CONTROLLER_DUMP);
> + if (rc)
> + goto out;
> +
> + val = ((u64)args.offset) << 32;
> + val |= args.buf_size;
> + rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu,
> + ocxlpmem->admin_command.request_offset + 0x08,
> + OCXL_LITTLE_ENDIAN, val);
> + if (rc)
> + goto out;
> +
> + rc = admin_command_execute(ocxlpmem);
> + if (rc)
> + goto out;
> +
> + rc = admin_command_complete_timeout(ocxlpmem,
> + ADMIN_COMMAND_CONTROLLER_DUMP);
> + if (rc < 0) {
> + dev_warn(&ocxlpmem->dev, "Controller dump timed out\n");
> + goto out;
> + }
> +
> + rc = admin_response(ocxlpmem);
> + if (rc < 0)
> + goto out;
> + if (rc != STATUS_SUCCESS) {
> + warn_status(ocxlpmem,
> + "Unexpected status from retrieve error log",

Controller dump

> + rc);
> + goto out;
> + }
> +
> + for (i = 0; i < args.buf_size; i += 8) {
> + u64 val;
> +
> + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
> + ocxlpmem->admin_command.data_offset + i,
> + OCXL_HOST_ENDIAN, &val);

Is a controller dump something where we want to do endian swapping?

Any reason we're not doing the usual check of the data identifier,
additional data length etc?

> + if (rc)
> + goto out;
> +
> + if (copy_to_user(&args.buf[i], &val, sizeof(u64))) {
> + rc = -EFAULT;
> + goto out;
> + }
> + }
> +
> + if (copy_to_user(uarg, &args, sizeof(args))) {
> + rc = -EFAULT;
> + goto out;
> + }
> +
> + rc = admin_response_handled(ocxlpmem);
> + if (rc)
> + goto out;
> +
> +out:
> + mutex_unlock(&ocxlpmem->admin_command.lock);
> + return rc;
> +}
> +
> +int request_controller_dump(struct ocxlpmem *ocxlpmem)
> +{
> + int rc;
> + u64 busy = 1;
> +
> + rc = ocxl_global_mmio_set64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_CHIC,
> + OCXL_LITTLE_ENDIAN,
> + GLOBAL_MMIO_CHI_CDA);

This return code is ignored

> +
> +
> + rc = ocxl_global_mmio_set64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_HCI,
> + OCXL_LITTLE_ENDIAN,
> + GLOBAL_MMIO_HCI_CONTROLLER_DUMP);
> + if (rc)
> + return rc;
> +
> + while (busy) {
> + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
> + GLOBAL_MMIO_HCI,
> + OCXL_LITTLE_ENDIAN, &busy);
> + if (rc)
> + return rc;
> +
> + busy &= GLOBAL_MMIO_HCI_CONTROLLER_DUMP;
> + cond_resched();
> + }
> +
> + return 0;
> +}


--
Andrew Donnellan OzLabs, ADL Canberra
ajd@linux.ibm.com IBM Australia Limited

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