Getting Error Status

If a fault has occurred that affects the resource mapped by the handle, the error status structure is updated to reflect error information captured during error handling by a bus or other device driver in the I/O data path.

void ddi_fm_dma_err_get(ddi_dma_handle_t handle, ddi_fm_error_t *de, int version)

void ddi_fm_acc_err_get(ddi_acc_handle_t handle, ddi_fm_error_t *de, int version)

The ddi_fm_dma_err_get(9F) and ddi_fm_acc_err_get(9F)functions return the error status for a DMA or access handle respectively. The version field should be set to DDI_FME_VERSION.

An error for an access handle means that an error has been detected that has affected PIO transactions to or from the device using that access handle. Any data received by the driver, for example via a recent ddi_get8(9F) call, should be considered potentially corrupt. Any data sent to the device, for example via a recent ddi_put32(9F) call might also have been corrupted or might not have been received at all. The underlying fault might, however, be transient, and the driver can therefore attempt to recover by calling ddi_fm_acc_err_clear(9F), resetting the device to get it back into a known state, and retrying any potentially failed transactions.

If an error is indicated for a DMA handle, it implies that an error has been detected that has (or will) affect DMA transactions between the device and the memory currently bound to the handle (or most recently bound, if the handle is currently unbound). Possible causes include the failure of a component in the DMA data path, or an attempt by the device to make an invalid DMA access. The driver might be able to continue by retrying and reallocating memory. The contents of the memory currently (or previously) bound to the handle should be regarded as indeterminate and should be released back to the system. The fault indication associated with the current transaction is lost once the handle is bound or re-bound, but because the fault might persist, future DMA operations might not succeed.