blackbird-op-linux/drivers, branch v4.4.3-openpower2

net/mlx4_core: Set UAR page size to 4KB regardless of system page size

2016-03-03T01:10:05+00:00

problem description: The current code sets UAR page size equal to system page size. The ConnectX-3 and ConnectX-3 Pro HWs require minimum 128 UAR pages. The mlx4 kernel drivers are not loaded if there is less than 128 UAR pages. solution: Always set UAR page to 4KB. This allows more UAR pages if the OS has PAGE_SIZE larger than 4KB. For example, PowerPC kernel use 64KB system page size, with 4MB uar region, there are 4MB/2/64KB = 32 uars (half for uar, half for blueflame). This does not meet minimum 128 UAR pages requirement. With 4KB UAR page, there are 4MB/2/4KB = 512 uars which meet the minimum requirement. Note that only codes in mlx4_core that deal with firmware know that uar page size is 4KB. Codes that deal with usr page in cq and qp context (mlx4_ib, mlx4_en and part of mlx4_core) still have the same assumption that uar page size equals to system page size. Note that with this implementation, on 64KB system page size kernel, there are 16 uars per system page but only one uars is used. The other 15 uars are ignored because of the above assumption. Regarding SR-IOV, mlx4_core in hypervisor will set the uar page size to 4KB and mlx4_core code in virtual OS will obtain the uar page size from firmware. Regarding backward compatibility in SR-IOV, if hypervisor has this new code, the virtual OS must be updated. If hypervisor has old code, and the virtual OS has this new code, the new code will be backward compatible with the old code. If the uar size is big enough, this new code in VF continues to work with 64 KB uar page size (on PowerPc kernel). If the uar size does not meet 128 uars requirement, this new code not loaded in VF and print the same error message as the old code in Hypervisor. Signed-off-by: Huy Nguyen Reviewed-by: Yishai Hadas Signed-off-by: David S. Miller (cherry picked from commit 85743f1eb34548ba4b056d2f184a3d107a3b8917) Signed-off-by: Joel Stanley

scsi: ignore errors from scsi_dh_add_device()

2016-03-03T01:07:35+00:00

device handler initialisation might fail due to a number of reasons. But as device_handlers are optional this shouldn't cause us to disable the device entirely. So just ignore errors from scsi_dh_add_device(). Reviewed-by: Johannes Thumshirn Reviewed-by: Christoph Hellwig Signed-off-by: Hannes Reinecke Signed-off-by: Martin K. Petersen Signed-off-by: Joel Stanley

drivers/drm/ast: Switch SCU to VGA output on POST

2016-03-03T01:07:34+00:00

On AST BMC platforms, the BMC may be using the VGA device for UART mirroring. In this case, we need to switch the DAC output to VGA mode. Signed-off-by: Jeremy Kerr Signed-off-by: Joel Stanley

xhci: do not halt the secondary HCD

2016-02-28T23:04:14+00:00

We can't halt the secondary HCD, because it's also the primary HCD, which will cause problems if we have devices attached to the primary HCD, like a keyboard. Signed-off-by: Jeremy Kerr Signed-off-by: Joel Stanley

Revert "usb: xhci: stop everything on the first call to xhci_stop"

2016-02-28T23:04:13+00:00

This reverts commit 8c24d6d7b09deee3036ddc4f2b81b53b28c8f877. With this patch, the driver stops everything at the first call to xhci_stop, which is always for the secondary HCD when executing the .remove handler. We instead want to only stop when the primray HCD is shutting down. Signed-off-by: Joel Stanley

xhci: Use xhci_pci_remove for xhci device shutdown

2016-02-28T23:04:13+00:00

Signed-off-by: Jeremy Kerr

intel_scu_ipcutil: underflow in scu_reg_access()

2016-02-25T20:01:23+00:00

commit b1d353ad3d5835b16724653b33c05124e1b5acf1 upstream. "count" is controlled by the user and it can be negative. Let's prevent that by making it unsigned. You have to have CAP_SYS_RAWIO to call this function so the bug is not as serious as it could be. Fixes: 5369c02d951a ('intel_scu_ipc: Utility driver for intel scu ipc') Signed-off-by: Dan Carpenter Signed-off-by: Darren Hart Signed-off-by: Greg Kroah-Hartman

drivers/hwspinlock: fix race between radix tree insertion and lookup

2016-02-25T20:01:23+00:00

commit c6400ba7e13a41539342f1b6e1f9e78419cb0148 upstream. of_hwspin_lock_get_id() is protected by the RCU lock, which means that insertions can occur simultaneously with the lookup. If the radix tree transitions from a height of 0, we can see a slot with the indirect_ptr bit set, which will cause us to at least read random memory, and could cause other havoc. Fix this by using the newly introduced radix_tree_iter_retry(). Signed-off-by: Matthew Wilcox Cc: Hugh Dickins Cc: Ohad Ben-Cohen Cc: Konstantin Khlebnikov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman

xhci: Fix list corruption in urb dequeue at host removal

2016-02-25T20:01:22+00:00

commit 5c82171167adb8e4ac77b91a42cd49fb211a81a0 upstream. xhci driver frees data for all devices, both usb2 and and usb3 the first time usb_remove_hcd() is called, including td_list and and xhci_ring structures. When usb_remove_hcd() is called a second time for the second xhci bus it will try to dequeue all pending urbs, and touches td_list which is already freed for that endpoint. Reported-by: Joe Lawrence Tested-by: Joe Lawrence Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman

Revert "xhci: don't finish a TD if we get a short-transfer event mid TD"

2016-02-25T20:01:22+00:00

commit a6835090716a85f2297668ba593bd00e1051e662 upstream. This reverts commit e210c422b6fd ("xhci: don't finish a TD if we get a short transfer event mid TD") Turns out that most host controllers do not follow the xHCI specs and never send the second event for the last TRB in the TD if there was a short event mid-TD. Returning the URB directly after the first short-transfer event is far better than never returning the URB. (class drivers usually timeout after 30sec). For the hosts that do send the second event we will go back to treating it as misplaced event and print an error message for it. The origial patch was sent to stable kernels and needs to be reverted from there as well Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman