The SDMA engines were configured to generate progress interrupts every time they
processed N/2 descriptors (where N is the size of the descriptor queue). This
interval was too infrequent, leading to degraded performance.

This commit adds a module parameter, as well as a recommended default, which
allows for the tuning of the interrupt frequency.
Reviewed-by: NMike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: NMitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The address being mapped into a process's memory for notification events was
improperly calculated due to cast that was happening too early. dd->events is a
pointer and should have been casted to unsigned long after the pointer
arithmetic was done, not before.

As a result, processes were looking at the wrong place and not seeing their
notification events.
Signed-off-by: NMitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

User SDMA keeps track of progress into the submitted IO vectors by tracking an
offset into the vectors when packets are submitted. This offset is updated
after a successful submission of a txreq to the SDMA engine.

The same offset was used when determining whether an IO vector should be
'freed' (pages unpinned) in the SDMA callback functions.

This was causing a silent data corruption in big jobs (> 2 nodes, 120 ranks
each) on the receive side because the send side was mistakenly unpinning the
vector pages before the HW has processed all descriptors referencing the
vector.
Reviewed-by: NMike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: NMitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The DC firmware overwrites the enable_lane_tx register and does not update it
on a host request to go to Poll. This causes an infinite loop through the LNI
state machine if a link width downgrade occurs. This patch re-sets the
enable_lane_tx register to all 4 lanes.
Reviewed-by: NDean Luick <dean.luick@intel.com>
Signed-off-by: NEaswar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

When under heavy load, the send handler can run too long without allowing other
tasks to run.  Add a conditional resched to break this up.
Reviewed-by: NMike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: NDean Luick <dean.luick@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Reset firmware instead of reloading Sbus firmware if it's already done for this
ASIC.  To work around thermal polling problem in firmware, don't reload Sbus
firmware, instead, reset the firmware on the initialization of the second HFI.
Reviewed-by: NEaswar Hariharan <easwar.hariharan@intel.com>
Reviewed-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: NDean Luick <dean.luick@intel.com>
Signed-off-by: NCaz Yokoyama <caz.yokoyama@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Driver does not verify userid for shared context assignments, allowing
malicious user access.

Reviewed by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: NJareer H Abdel-Qader <jareer.h.abdel-qader@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This fixes transmit errors when the number of scatter gather elements in the
request is more that the number of per packet descriptors supported by the
hardware, allocate and coalesce the extra scatter gather elements into a single
buffer. The last descriptor is reserved and used for this coalesced buffer.

Verbs potentially need this support when transferring small data chunks
involving different memory regions.
Reviewed-by: NMike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: NMitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: NNiranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The QSFP interface code has been running without issues and the flag is
never set to off. This patch removes the QSFP_ENABLED bit from HFI1_CAP.
Reviewed-by: NMike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: NEaswar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

If packets stop egressing the hardware link, software can lock up.

Implement a timeout for send context halt recovery.  This patch increases the
timeout for packet egress to 500 us and timer resets to zero if the packet
occupancy changes. Also we bounce the link on time out.
Reviewed-by: NDean Luick <dean.luick@intel.com>
Signed-off-by: NVennila Megavannan <vennila.megavannan@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The latest version of the 8051 firmware will wait longer
when bringing the link down.  Extend the driver's timeout
to go with that.
Reviewed-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NDean Luick <dean.luick@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The ASIC registers were not reset on FLR, and the code to
protect the ASIC block against multiple initializations by
peer HFIs did not extend to multiple ASICs in a system. This
patch addresses this gap.
Reviewed-by: NDean Luick <dean.luick@intel.com>
Signed-off-by: NEaswar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The clear_ahg call is new in hfi1 vs qib.  For small messages the progress
routine always builds one and clears out the ahg state when the queue has gone
to empty which is the predominant case for small messages.

Inline the routine and avoid the call to sdma_ahg_free to mitigate the
performance impact.  Finally, move the routine to qp.h for scope reasons.
Reviewed-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NMike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Use the timer API function setup_timer instead of init_timer, removing
the structure field assignments.
Signed-off-by: NMuhammad Falak R Wani <falakreyaz@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Use the timer API function setup_timer instead of init_timer, removing
the structure field assignments.

<smpl>

@timer@
expression e1,e2,e3,fn_ptr;
@@
-init_timer(&e1);
+setup_timer(&e1, fn_ptr, e2);
... when != fn_ptr = e3
-e1.function = fn_ptr;
-e1.data = e2;

</smpl>
Signed-off-by: NMuhammad Falak R Wani <falakreyaz@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The {x,y}LCD fields of struct sm750_dev are not used and can be removed.
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

There are several occurencies of '#ifdef CAP_EXP<something>', spelled
differently each time. None of these is ever defined and therefore they
enclose dead code that can be removed.
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Both struct lynx_share and struct sm750_dev reprsent some parts of the
SM750 graphics adapter. There is no point to keep these parts in
different structures.
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The lynx_share field in lynx_cursor structure is never used and can be
removed.
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Fix wrong indentation of a line in lynxfb_set_fbinfo
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Use sm750_dev as private driver data for the PCI device
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Use proper 'struct sm750_dev *' type instead of 'void *'
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Use sm750_dev rather than lynx_share as parameter for hw_sm750_map,
hw_sm750_inithw and hw_sm750_initAccel functions.
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The hw_sm750_getVMSize wraps ddk750_getVMSize without any added
functionality. Call ddk750_getVMSize directly and remove
hw_sm750_getVMSize.
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Use sm750_dev instead of lynx_share in the private data of the
frambuffer device.
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The PROC_SPEC* typedefs are not used and can be removed
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The struct sm750_state is never used on its own. Merge it into the
struct sm750_dev.
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Use consistent naming for 'struct sm750_dev' variables
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The struct sm750_share represents the device state and name sm750_dev
seems more appropriate.
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

There is no actual need to split type definitions and global function
declarations between lots of small headers.
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The smi_indent variable is only declared, but never used. Remove it.
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The custom macro PADDING differs from standard kernel ALIGN only in
parameters order. Replace PADDING with ALIGN and remove it's definition.
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The SPC_SM750 define is not used and can be removed
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

The methods in lynx_cursor always use the same implementation and there is
no point to use redirection rather than direct function call.
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Remove unneeded forward function declarations.

Addresses checkpatch.pl:
WARNING: externs should be avoided in .c files
Signed-off-by: NAlison Schofield <amsfield22@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Move function types to be adjacent to the function names in
declarations to improve readability.
Signed-off-by: NAlison Schofield <amsfield22@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Adds required spacing around operands to improve readability.
Corrects checkpatch.pl ERROR: spaces required *
Signed-off-by: NAlison Schofield <amsfield22@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Reworked comments per kernel coding style to improve readability.

Corrects checkpatch.pl:
WARNING: Block comments use * on subsequent lines
WARNING: line over 80 characters
Signed-off-by: NAlison Schofield <amsfield22@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Remove unnecessary variable that can be replaced with a single line
of code.

The semantic patch used to find this is:

// <smpl>
@@
expression ret;
@@
- if (ret) return ret;
- return 0;
+ return ret;

@@
local idexpression ret;
expression e;
@@
- ret = e;
- return ret;
+ return e;

@@
type T;
identifier i;
expression E;
@@
- T i = E;
 ... when != i

@@
type T;
identifier i;
@@
- T i;
 ... when != i
// </smpl>
Signed-off-by: NAmitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Drop unused function that is defined but is not called anywhere.
Signed-off-by: NAmitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>