Manual Pages for UNIX Operating System command usage for man ddi_fm_dma_err_get

Kernel Functions for Drivers               ddi_fm_acc_err_get(9F)



NAME
     ddi_fm_acc_err_get,  ddi_fm_dma_err_get  -  get  the   error
     status for an access or DMA handle

SYNOPSIS
     #include 

     void ddi_fm_acc_err_get(ddi_acc_handle_t acc_handle,
          ddi_fm_error_t *error_status, int version);


     void ddi_fm_dma_err_get(ddi_dma_handle_t dma_handle,
          ddi_fm_error_t *error_status, int version);


INTERFACE LEVEL
     Solaris DDI specific (Solaris DDI)

PARAMETERS
     acc_handle      Data access handle obtained from a  previous
                     call        to       ddi_regs_map_setup(9F),
                     ddi_dma_mem_alloc(9F), or to a similar func-
                     tion.


     dma_handle      DMA handle obtained from a previous call  to
                     ddi_dma_mem_alloc(9F)  or one of its deriva-
                     tives.


     error_status    Pointer to where the error  status  for  the
                     access or DMA handle should be returned.


     version         Version number of ddi_fm_error_t. The driver
                     should always set this to DDI_FME_VERSION.


DESCRIPTION
     The ddi_fm_dma_err_get() and ddi_fm_acc_err_get()  functions
     return  the error status for a DMA or access handle, respec-
     tively. If a fault has occurred that  affects  the  resource
     mapped  by  the  supplied  handle, the supplied 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.   When    no    error    has    occurred,
     error_status.fme_status is set to DDI_FM_OK.


     If an error is indicated for an access  handle,  the  driver
     might  no  longer  be able to access the mapped registers or
     memory using programmed I/O through the  handle.  Typically,



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Kernel Functions for Drivers               ddi_fm_acc_err_get(9F)



     this  might  occur after the device has failed to respond to
     an I/O access, such as in the case  of  a  bus  error  or  a
     timeout.  The  effect  of  programmed I/O access made at the
     time of a fault is undefined. Read access via  ddi_get8(9F),
     for  example,  can  return random values, while write access
     via ddi_put8(9F) might or might not have an  effect.  It  is
     possible,  however,  that  the  error might be transient. In
     that case, the driver can  attempt  to  recover  by  calling
     ddi_fm_acc_err_clear(), resetting the device to return it to
     a known state, then retrying any potentially failed transac-
     tions.


     If an error is indicated for a DMA handle, it  implies  that
     an error has been detected that has or will affect DMA tran-
     sactions between the device and the memory  currently  bound
     to  the  handle, or to the memory 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  contents  of
     any  memory  currently  or  previously  bound  to the handle
     should be considered indeterminate. The driver might be able
     to  continue  by  freeing memory that is bound to the handle
     back to the system, resetting the device to return it  to  a
     known  state,  then retrying any potentially failed transac-
     tions.


     If the driver is unable  to  recover,  the  operating  state
     should  be changed by a call to ddi_fm_service_impact() that
     specifies DDI_SERVICE_LOST for the impacted device instance.
     If  the  recovery  and retry succeed, a call should still be
     made to ddi_fm_service_impact()  but  DDI_SERVICE_UNAFFECTED
     should be specified.

CONTEXT
     The ddi_fm_acc_err_get() and ddi_fm_dma_err_get()  functions
     can  be  called  from  user, kernel, or high-level interrupt
     context.

ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:












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Kernel Functions for Drivers               ddi_fm_acc_err_get(9F)



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Interface Stability         | Committed                   |
    |_____________________________|_____________________________|


SEE ALSO
     attributes(5),                        ddi_dma_mem_alloc(9F),
     ddi_fm_acc_err_clear(9F),         ddi_fm_service_impact(9F),
     ddi_get8(9F),     ddi_put8(9F),      ddi_regs_map_setup(9F),
     ddi_fm_error(9S),


     Writing Device Drivers








































SunOS 5.11           Last change: 8 Jan 2010                    3