In high-datarate aging tests, it is found that the
SCSI framework can periodically issue lu resets as
some commands timeout.
Response TASK SET FULL and SAS_QUEUE_FULL may be
returned many times for the same command, causing the
timeouts.
The SAS_QUEUE_FULL errors come from
TRANS_TX_CREDIT_TIMEOUT_ERR, TRANS_TX_CLOSE_NORMAL_ERR,
and TRANS_TX_ERR_FRAME_TXED errors. They do not mean
that the queue is full in the host, but rather it is
equivalent to meaning the queue is full for the sdev.
To overcome this, the queue depth for the sdev is
reduced to 64 (from 256, set in sas_slave_configure()).
Normally error code SAS_QUEUE_FULL will result in the
sdev queue depth falling, but it falls too slowly during
high-datarate tests and commands timeout before it
has fallen to an adequete level from original value.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add a function to abort a slot (task) in the target
device and then cleanup and complete the task.
The function is called from work queue context as
it cannot be called from the context where it is
triggered (interrupt).
Flag hisi_sas_slot.abort is added as the flag used
in the slot error handler to indicate whether the
slot needs to be aborted in the sdev prior to
cleanup and finish.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

In hisi_sas_exec_internal_tmf_task(), the check for
SAM_STAT_GOOD is replaced with
TMF_RESP_FUNC_COMPLETE, which is a genuine tmf
response code.
SAM_STAT_GOOD and TMF_RESP_FUNC_COMPLETE have the
same value, so this is why it worked before.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The hisi_sas driver is required to support both device tree and
ACPI. The scanning of the device properties now uses the Unified Device
Properties API, which serves both OF and ACPI.

Since syscon is not supported by ACPI, syscon is only used in the driver
when device tree is used.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NZhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Since v2 hardware permits different numbers of commands to v1, set this
as configurable in hisi_sas_hw.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Relocate DEV_IS_EXPANDER to hisi_sas.h as it will be required for v2 hw
support.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

There were a couple cases where the error codes weren't set and also I
changed the success return to "return 0;" which is the same as
"return rc;" but more explicit.

Fixes: 42e7a693 ('hisi_sas: Add ssp command functio')
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Tested-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Originally the driver would use of_irq_count to calculate how much
memory is required for storing the interrupt names, since the number of
interrupt sources for the controller is variable.  Since of_irq_count
cannot be used by the driver, use fixed names.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NZhangfei Gao <zhangfei.gao@linaro.org>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add method for lldd_control_phy. Currently link rate control and spinup
hold is unsupported.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add function methods for tmf's.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add functions for scsi host template scan_finished and scan_start
methods.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add support for smp function, which allows devices attached by expander
to be controlled.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add abnormal irq handler. This handler is concerned with phy down event.
Also add port formed and port deformed handlers.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add functions to deal with lldd_dev_found and lldd_dev_gone.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add cq interrupt handler and also slot error handler function.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add path to send ssp command to HW.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Include initialisation.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

The SAS address for the HBA comes from the device tree.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Each completion queue has a structure. This is mainly for passing to irq
handler so we know which queue the irq occured on.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add functionality to init slot indexing.

Slot indexing is for the host to track which slots (or tags) are free
and which are used.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This patch also includes relevant memory/pool freeing and sas/scsi host
removal.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Allocate DMA and non-DMA memories for the controller. Also create DMA
pools.

These include:

- Delivery queues
- Completion queues
- Command status buffer
- Command table
- ITCT (For device context)
- Host slot info
- IO status
- Breakpoint
- host slot indexing
- SG data
- FIS
- interrupts names
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Scan the device tree for all properties. Also do this:

- do ioremap for SAS registers
- allocate memory for interrupt names
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

Add functionality to register device as a scsi host.

The SAS domain transport ops are empty at this point.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

This patch adds the initial bare main driver for the HiSilicon SAS
HBA. This only introduces the changes to build and load the main driver
module.

The complete driver consists of the core main module and also a module
platform driver for driving the hw.

The HBA is a platform device.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NZhangfei Gao <zhangfei.gao@linaro.org>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Reviewed-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>