Replace the 32-bit unsigned used to track enabled endpoints with a
Linux bitmap, to allow an arbitrary number of endpoints to be
represented.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Replace the 32-bit unsigned used to track endpoints that have
completed setup with a Linux bitmap, to allow an arbitrary number
of endpoints to be represented.

Rework the error handling in ipa_endpoint_init() so the defined
endpoint bitmap is freed if an error occurs early.  Once endpoints
have been initialized, ipa_endpoint_exit() is used to recover if
the set of filtered endpoints is invalid.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Prior to IPA v5.0, there could be no more than 32 endpoints.

A filter table begins with a bitmap indicating which endpoints have
a filter defined.  That bitmap is currently assumed to fit in a
32-bit value.

Starting with IPA v5.0, more than 32 endpoints are supported, so
it's conceivable that a TX endpoint has an ID that exceeds 32.
Increase the size of the field representing endpoints that support
filtering to 64 bits.  Rename the bitmap field "filtered".

Unlike other similar fields, we do not use an (arbitrarily long)
Linux bitmap for this purpose.  The reason is that if a filter table
ever *did* need to support more than 64 TX endpoints, its format
would change in ways we can't anticipate.

Have ipa_endpoint_init() return a negative errno rather than a mask
that indicates which endpoints support filtering, and have that
function assign the "filtered" field directly.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Similar to the previous patch, replace the 32-bit unsigned used to
track endpoints supported by hardware with a Linux bitmap, to allow
an arbitrary number of endpoints to be represented.

Move ipa_endpoint_deconfig() above ipa_endpoint_config() and use
it in the error path of the latter function.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

IPA v5.0 supports more than 32 endpoints, so we will be unable to
represent endpoints defined in the configuration data with a 32-bit
value.  To prepare for that, convert the field in the IPA structure
representing defined endpoints to be a Linux bitmap.

Convert loops based on that field into for_each_set_bit() calls over
the new bitmap.  Note that the loop in ipa_endpoint_config() still
assumes there are 32 or fewer endpoints (when comparing against the
available endpoint bit mask); that assumption goes away in the next
patch.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Starting with IPA v5.0, a single IPA instance can have more than 32
endpoints defined.  To handle this, each register that holds a
bitmap of IPA endpoints is replicated as needed to represent the
available endpoints.

To prepare for this, registers that represent endpoint IDs in a bit
mask will be defined to have a parameter, with a stride value of 4
bytes.  The first 32 endpoints are represented in the first 32-bit
register, then the next (up to) 32 endpoints at an offset 4 bytes
higher.  When accessing such a register, the endpoint ID divided
by 32 determines the offset, and the endpoint ID modulo 32 defines
the endpoint's bit position within the register.

The first two registers we'll update for this are STATE_AGGR_ACTIVE
and AGGR_FORCE_CLOSE.

Until more than 32 endpoints are supported, this change has no
practical effect.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Define a new field in the IPA structure that records the maximum
number of entries that will be used in the IPA endpoint array.  Use
that value rather than IPA_ENDPOINT_MAX to determine the end
condition for two loops that iterate over all endpoints.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Each endpoint ID has an entry in the IPA endpoint array.  But the
size of that array is defined at compile time.  Instead, rename
ipa_endpoint_data_valid() to be ipa_endpoint_max() and have it
return the maximum endpoint ID defined in configuration data.
That function will still validate configuration data.

Zero is returned on error; it's a valid endpoint ID, but we need
more than one, so it can't be the maximum.  The next patch makes use
of the returned maximum value.

Finally, rename the "initialized" mask of endpoints defined by
configuration data to be "defined".

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Change two functions that iterate over all endpoints to use while
loops, using "endpoint_id" as the index variables in both spots.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Ensure all defined TX endpoints are in the range [0, CONS_PIPES) and
defined RX endpoints are within [PROD_LOWEST, PROD_LOWEST+PROD_PIPES).

Modify the way local variables are used to make the checks easier
to understand.  Check for each endpoint being in valid range in the
loop, and drop the logical-AND check of initialized against
unavailable IDs.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>