Each call to the co-processor, with exception of the last call, needs to
send data that is multiple of block size. As consequence, any remaining
data is kept in the internal NX context.

This patch fixes a bug in the driver that causes it to save incorrect
data into the context when data is bigger than the block size.
Reviewed-by: NJoy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: NMarcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

The NX CGM implementation doesn't support zero length messages and the
current implementation has two flaws:

 - When the input data length is zero, it ignores the associated data.
 - Even when both lengths are zero, it uses the Crypto API to encrypt a
   zeroed block using ctr(aes) and because of this it allocates a new
   transformation and sets the key for this new tfm. Both operations are
   intended to be used only in user context, while the cryptographic
   operations can be called in both user and softirq contexts.

This patch replaces the nested Crypto API use and adds two special
cases:

 - When input data and associated data lengths are zero: it uses NX ECB
   mode to emulate the encryption of a zeroed block using ctr(aes).
 - When input data is zero and associated data is available: it uses NX
   GMAC mode to calculate the associated data MAC.
Reviewed-by: NJoy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: NMarcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

The NX XCBC implementation doesn't support zero length messages and
because of that NX is currently returning a hard-coded hash for zero
length messages. However this approach is incorrect since the hash value
also depends on which key is used.

This patch removes the hard-coded hash and replace it with an
implementation based on the RFC 3566 using ECB.
Reviewed-by: NJoy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: NMarcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

This patch updates the NX driver to perform several hyper calls when necessary
so that the length limits of scatter/gather lists are respected.
Reviewed-by: NMarcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: NJoy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: NFionnuala Gunter <fin@linux.vnet.ibm.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

This patch updates the NX driver to perform several hyper calls when necessary
so that the length limits of scatter/gather lists are respected.
Reviewed-by: NJoy Latten <jmlatten@linux.vnet.ibm.com>
Reviewed-by: NMarcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: NFionnuala Gunter <fin@linux.vnet.ibm.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

This patch updates the nx-aes-gcm implementation to perform several
hyper calls if needed in order to always respect the length limits for
scatter/gather lists.

Two different limits are considered:

 - "ibm,max-sg-len": maximum number of bytes of each scatter/gather
   list.

 - "ibm,max-sync-cop":
    - The total number of bytes that a scatter/gather list can hold.
    - The maximum number of elements that a scatter/gather list can have.
Reviewed-by: NJoy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: NMarcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

This patch updates the nx-aes-ctr implementation to perform several
hyper calls if needed in order to always respect the length limits for
scatter/gather lists.

Two different limits are considered:

 - "ibm,max-sg-len": maximum number of bytes of each scatter/gather
   list.

 - "ibm,max-sync-cop":
    - The total number of bytes that a scatter/gather list can hold.
    - The maximum number of elements that a scatter/gather list can have.
Reviewed-by: NJoy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: NMarcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

This patch updates the nx-aes-cbc implementation to perform several
hyper calls if needed in order to always respect the length limits for
scatter/gather lists.

Two different limits are considered:

 - "ibm,max-sg-len": maximum number of bytes of each scatter/gather
   list.

 - "ibm,max-sync-cop":
    - The total number of bytes that a scatter/gather list can hold.
    - The maximum number of elements that a scatter/gather list can have.
Reviewed-by: NJoy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: NMarcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

This patch updates the nx-aes-ecb implementation to perform several
hyper calls if needed in order to always respect the length limits for
scatter/gather lists.

Two different limits are considered:

 - "ibm,max-sg-len": maximum number of bytes of each scatter/gather
   list.

 - "ibm,max-sync-cop":
    - The total number of bytes that a scatter/gather list can hold.
    - The maximum number of elements that a scatter/gather list can have.
Reviewed-by: NJoy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: NMarcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

This patch includes one more parameter to nx_build_sg_lists() to skip
the given number of bytes from beginning of each sg list.

This is needed in order to implement the fixes for the AES modes to make
them able to process larger chunks of data.
Reviewed-by: NJoy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: NMarcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

padata_cpu_callback() takes pinst->lock, to avoid taking
an uninitialized lock, register the notifier after it's
initialization.
Signed-off-by: NRichard Weinberger <richard@nod.at>
Acked-by: NSteffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

padata - share code between CPU_ONLINE and CPU_DOWN_FAILED, same to CPU_DOWN_PREPARE and CPU_UP_CANCELED

Share code between CPU_ONLINE and CPU_DOWN_FAILED, same to
CPU_DOWN_PREPARE and CPU_UP_CANCELED.

It will fix 2 bugs:

  "not check the return value of __padata_remove_cpu() and __padata_add_cpu()".
  "need add 'break' between CPU_UP_CANCELED and CPU_DOWN_FAILED".
Signed-off-by: NChen Gang <gang.chen@asianux.com>
Acked-by: NSteffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

The newly added omap4 support in the driver was added without
consideration for building older configs. When building omap1_defconfig,
it resulted in:

drivers/char/hw_random/omap-rng.c:190:12: warning: 'omap4_rng_init' defined but not used [-Wunused-function]
drivers/char/hw_random/omap-rng.c:215:13: warning: 'omap4_rng_cleanup' defined but not used [-Wunused-function]
drivers/char/hw_random/omap-rng.c:251:20: warning: 'omap4_rng_irq' defined but not used [-Wunused-function]

Move the code around so it is grouped with its operations struct, which
for the omap4 case means also under the #ifdef CONFIG_OF, where it needs
to be.
Signed-off-by: NOlof Johansson <olof@lixom.net>
Reviewed-by: NLokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Each cycle of SHA512 operates on 32 data words where as
SHA256 operates on 16 data words. This needs to be updated
while configuring DMA channels. Doing the same.
Signed-off-by: NLokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

For writing input buffer into DATA_IN register current driver
has the following state machine:
-> if input buffer < 9 : use fallback driver
-> else if input buffer < block size : Copy input buffer into data_in regs
-> else use dma transfer.

In cases where requesting for DMA channels fails for some reason,
or channel numbers are not provided in DT or platform data, probe
also fails. Instead of returning from driver use cpu polling mode.
In this mode processor polls on INPUT_READY bit and writes data into
data_in regs when it equals 1. This operation is repeated until the
length of message.

Now the state machine looks like:
-> if input buffer < 9 : use fallback driver
-> else if input buffer < block size : Copy input buffer into data_in regs
-> else if dma enabled: use dma transfer
	   else use cpu polling mode.
Signed-off-by: NLokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

The bug here is that:

	while (eng_busy & (!icq_empty) & dma_busy)

is never true because it's using bitwise instead of logical ANDs.  The
other bitwise AND conditions work as intended but I changed them as well
for consistency.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

There is a typo here.  "dev->hw_link[]" is an array, not a pointer, so
the check is nonsense.  We should be checking recently allocated
"dev->hw_link[0]" instead.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

For AM437x SoC, ARCH_OMAP2 and ARCH_OMAP3 is not enabled in the defconfig. We
follow same thing as SHA driver, and add depends on ARCH_OMAP2PLUS so that the
config is selectable for AES driver on AM437x SoC builds.
Signed-off-by: NJoel Fernandes <joelf@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Keeps request_irq exit/error code paths simpler.
Suggested-by: NLokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: NJoel Fernandes <joelf@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Use devm_kzalloc instead of kzalloc. With this change, there is no need to
call kfree in error/exit paths.
Signed-off-by: NJoel Fernandes <joelf@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

For cases where offset/length of on any page of the input SG is not aligned by
AES_BLOCK_SIZE, we copy all the pages from the input SG list into a contiguous
buffer and prepare a single element SG list for this buffer with length as the
total bytes to crypt.

This is requried for cases such as when an SG list of 16 bytes total size
contains 16 pages each containing 1 byte. DMA using the direct buffers of such
instances is not possible.

For this purpose, we first detect if the unaligned case and accordingly
allocate enough number of pages to satisfy the request and prepare SG lists.
We then copy data into the buffer, and copy data out of it on completion.
Signed-off-by: NJoel Fernandes <joelf@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

In cases where requesting for DMA channels fails for some reason, or channel
numbers are not provided in DT or platform data, we switch to PIO-only mode
also checking if platform provides IRQ numbers and interrupt register offsets
in DT and platform data. All dma-only paths are avoided in this mode.
Signed-off-by: NJoel Fernandes <joelf@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

We initialize the scatter gather walk lists needed for PIO mode and avoid all
DMA paths such as mapping/unmapping buffers by checking for the pio_only flag.
Signed-off-by: NJoel Fernandes <joelf@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

We add an IRQ handler that implements a state-machine for PIO-mode and data
structures for walking the scatter-gather list. The IRQ handler is called in
succession both when data is available to read or next data can be sent for
processing. This process continues till the entire in/out SG lists have been
walked. Once the SG-list has been completely walked, the IRQ handler schedules
the done_task tasklet.

Also add a useful macro that is used through out the IRQ code for a common
pattern of calculating how much an SG list has been walked.  This improves code
readability and avoids checkpatch errors.
Signed-off-by: NJoel Fernandes <joelf@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Add IRQ information to pdata and helper macros. These are required
for PIO-mode support.
Signed-off-by: NJoel Fernandes <joelf@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Intermdiate buffers were allocated, mapped and used for DMA.  These are no
longer required as we use the SGs from crypto layer directly in previous
commits in the series. Also along with it, remove the logic for copying SGs
etc as they are no longer used, and all the associated variables in omap_aes_device.
Signed-off-by: NJoel Fernandes <joelf@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Earlier functions that did a similar sync are replaced by the dma_sync_sg_*
which can operate on entire SG list.
Signed-off-by: NJoel Fernandes <joelf@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

In early version of this driver, assumptions were made such as DMA layer
requires contiguous buffers etc. Due to this, new buffers were allocated,
mapped and used for DMA. These assumptions are no longer true and DMAEngine
scatter-gather DMA doesn't have such requirements. We simply the DMA operations
by directly using the scatter-gather buffers provided by the crypto layer
instead of creating our own.

Lot of logic that handled DMA'ing only X number of bytes of the total, or as
much as fitted into a 3rd party buffer is removed and is no longer required.

Also, good performance improvement of atleast ~20% seen with encrypting a
buffer size of 8K (1800 ops/sec vs 1400 ops/sec).  Improvement will be higher
for much larger blocks though such benchmarking is left as an exercise for the
reader.  Also DMA usage is much more simplified and coherent with rest of the
code.
Signed-off-by: NJoel Fernandes <joelf@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Crypto layer only passes nbytes but number of SG elements is needed for mapping
or unmapping SGs at one time using dma_map* API and also needed to pass in for
dmaengine prep function.

We call function added to scatterwalk for this purpose in omap_aes_handle_queue
to populate the values which are used later.
Signed-off-by: NJoel Fernandes <joelf@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

When DEBUG is enabled, these macros can be used to print variables in integer
and hex format, and clearly display which registers, offsets and values are
being read/written , including printing the names of the offsets and their values.

Using statement expression macros in read path as,
Suggested-by: NJoe Perches <joe@perches.com>
Signed-off-by: NJoel Fernandes <joelf@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Crypto layer only passes nbytes to encrypt but in omap-aes driver we need to
know number of SG elements to pass to dmaengine slave API.  We add function for
the same to scatterwalk library.
Signed-off-by: NJoel Fernandes <joelf@ti.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

This patch fixes a bug in the nx-aes-gcm implementation.
Corrected the code so that the authtag is always verified after
decrypting and not just when there is associated data included.
Also, corrected the code to retrieve the input authtag from src
instead of dst.
Reviewed-by: NFionnuala Gunter <fin@linux.vnet.ibm.com>
Reviewed-by: NMarcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: NJoy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

This patch adds an option to the Kconfig file for
SEC which enables the user to see the debug messages
that are printed inside the SEC driver.
Signed-off-by: NAlex Porosanu <alexandru.porosanu@freescale.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

CAAM driver contains one macro (xstr) used for printing
the line location in a file where a memdump is done. This patch
replaces the xstr macro with the already existing __stringify
macro that performs the same function.
Signed-off-by: NAlex Porosanu <alexandru.porosanu@freescale.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

This affects xen pv guests with sufficiently old versions of xen and
sufficiently new hardware.  On such a system, a guest with a btrfs
root won't even boot.
Signed-off-by: NJohn Haxby <john.haxby@oracle.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Adjust alignment and replace commas by semicolons in automatically
generated code.
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Adjust alignment and replace commas by semicolons in automatically
generated code.
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Remove unneeded error handling on the result of a call to
platform_get_resource when the value is passed to devm_ioremap_resource.

Move the call to platform_get_resource adjacent to the call to
devm_ioremap_resource to make the connection between them more clear.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression pdev,res,n,e,e1;
expression ret != 0;
identifier l;
@@

- res = platform_get_resource(pdev, IORESOURCE_MEM, n);
  ... when != res
- if (res == NULL) { ... \(goto l;\|return ret;\) }
  ... when != res
+ res = platform_get_resource(pdev, IORESOURCE_MEM, n);
  e = devm_ioremap_resource(e1, res);
// </smpl>
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

The NX driver uses the transformation context to store several fields
containing data related to the state of the operations in progress.
Since a single tfm can be used by different kernel threads at the same
time, we need to protect the data stored into the context.

This patch makes use of spin locks to protect the data where a race
condition can happen.
Reviewed-by: NFionnuala Gunter <fin@linux.vnet.ibm.com>
Reviewed-by: NJoy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: NMarcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Tables used from assembler should be marked __visible to let
the compiler know.
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>