The rsxx driver was not checking the correct value during a
pci_map_page failure. Fixing this also uncovered a
double free if the bio was returned before it was
broken up into indiviadual 4k dmas, that is also
fixed here.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Adding debugfs entries to help with debugging and testing and
testing code.

pci_regs:
       	This entry will spit out all of the data stored on the BAR.

stats:
       	This entry will display all of the driver stats for each
       	DMA channel.

cram:
	This will allow read/write ability to the CRAM address space
	on our adapter's CPU.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Fixing incorrect stats calculation during read retries.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Unfortunaly, our CPU register path does not do any kind of
EEH error checking. So to fix this issue, an ioread32 was
added to the CPU register timeout code. This way, the
driver can check to see if the timeout was caused by an EEH
error or not. This is a dummy read.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Adding a sanity check to guarentee that DMAs outside of the device's
address space will be errored out right away.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

A kernel panic would occur on a DLPAR add if there was a partition
still mounted during the DLPAR remove. This bug fix will allow the
user to unmount the partition and bring the driver back into a
good state after the DLPAR add.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Changing the adapter name from FlashSystem-80 to the official
name: Flash Adapter 900GB Full Height.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Before, the partition table would have to be reread because our
card was attached before it transistioned out of it's 'starting'
state.

This change will cause the driver to wait to attach the device
until the adapter is ready.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Previously, the block size was determined by whether or not
our Hardware could handle 512 byte accesses. Now, all of our
Hardware can handle 512 and 4096 block sizes.

This fix allows it to be user configurable.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

The workqueue mechanism has been reworked to prevent soft
lockup issues from occuring by adding in mutex sychronization.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Before, DMAs would never be cancelled if there was a data stall
or an EEH Permenant failure which would cause an unrecoverable
I/O hang.

The DMA cancellation mechanism has been modified to fix
these issues and allows DMAs to be cancelled during the
above mentioned events.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Giving all interrupt based events their own workqueue to complete
tasks on. This fixes a bug that would cause creg commands to timeout
if too many are issued at once.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Commit d8d595df introduced a bug where we did not check for a NULL
return from kmalloc(). Make rsxx_eeh_save_issued_dmas() return an
error for that case, and make the callers handle that.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

This patch removes dynamic allocation on the stack error.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Spotted by Fenguan Wu's super build robot.
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Changes in v2 include:
o Fixed spelling of guarantee.
o Fixed potential memory leak if slot reset fails out.
o Changed list_for_each_entry_safe with list_for_each_entry.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

This patch includes a simple change to the rsxx_pci_remove
function that caused error messages because traffic was halted
too early.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

This patch includes changing the hardware branding name from
IBM RamSan to IBM FlashSystem.

v2 Changes include:
o Removing the unnecessary IBM Vendor ID #define

v1 Changes include:
o Changed all references of RamSan to FlashSystem.
o Changed the vendor/device IDs for the product.
o Changed driver version number.
o Updated the MAINTAINERS file.
o Various other little things.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

This patch includes changes to the cregs locking scheme. Before,
inconsistant locking would occur because of misuse of spin_lock,
spin_lock_bh, and counter parts.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

This patch includes trivial changes that were recommended by
different members of the Linux Community.

Changes include:
o Removing the redundant wmb().
o Formatting
o Various other little things.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

This patch includes the following driver fixes for the
IBM RamSan 70/80 driver:

o Changed the creg_ctrl lock from a mutex to a spinlock.
o Added a count check for ioctl calls.
o Removed unnecessary casting of void pointers.
o Made every function static that needed to be.
o Added comments to explain things more thoroughly.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

kbuild test robot says:

tree:   git://git.kernel.dk/linux-block.git for-3.9/drivers
head:   1262e24a
commit: 8722ff8c [6/8] block: IBM RamSan 70/80 device driver
config: make ARCH=alpha allyesconfig

All error/warnings:

   drivers/block/rsxx/dma.c: In function 'rsxx_complete_dma':
>> drivers/block/rsxx/dma.c:251:2: error: implicit declaration of function 'kmem_cache_free' [-Werror=implicit-function-declaration]
   drivers/block/rsxx/dma.c: In function 'rsxx_queue_discard':
>> drivers/block/rsxx/dma.c:567:2: error: implicit declaration of function 'kmem_cache_alloc' [-Werror=implicit-function-declaration]
>> drivers/block/rsxx/dma.c:567:6: warning: assignment makes pointer from integer without a cast [enabled by default]
   drivers/block/rsxx/dma.c: In function 'rsxx_queue_dma':
>> drivers/block/rsxx/dma.c:601:6: warning: assignment makes pointer from integer without a cast [enabled by default]
   drivers/block/rsxx/dma.c: In function 'rsxx_dma_init':
>> drivers/block/rsxx/dma.c:985:2: error: implicit declaration of function 'KMEM_CACHE' [-Werror=implicit-function-declaration]
>> drivers/block/rsxx/dma.c:985:29: error: 'rsxx_dma' undeclared (first use in this function)
   drivers/block/rsxx/dma.c:985:29: note: each undeclared identifier is reported only once for each function it appears in
>> drivers/block/rsxx/dma.c:985:39: error: 'SLAB_HWCACHE_ALIGN' undeclared (first use in this function)
   drivers/block/rsxx/dma.c: In function 'rsxx_dma_cleanup':
>> drivers/block/rsxx/dma.c:995:2: error: implicit declaration of function 'kmem_cache_destroy' [-Werror=implicit-function-declaration]
   cc1: some warnings being treated as errors
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

This patch includes the device driver for the IBM RamSan
family of PCI SSD flash storage cards. This driver will
include support for the RamSan 70 and 80. The driver
presents a block device for device I/O.
Signed-off-by: NPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>