#
b4bda59b |
|
07-Jun-2023 |
Nicholas Piggin <npiggin@gmail.com> |
powerpc/64s: Fix VAS mm use after free The refcount on mm is dropped before the coprocessor is detached. Reported-by: Sachin Sant <sachinp@linux.ibm.com> Fixes: 7bc6f71bdff5f ("powerpc/vas: Define and use common vas_window struct") Fixes: b22f2d88e435c ("powerpc/pseries/vas: Integrate API with open/close windows") Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Tested-by: Sachin Sant <sachinp@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20230607101024.14559-1-npiggin@gmail.com
|
#
c127d130 |
|
09-Apr-2022 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/powernv/vas: Assign real address to rx_fifo in vas_rx_win_attr In init_winctx_regs(), __pa() is called on winctx->rx_fifo and this function is called to initialize registers for receive and fault windows. But the real address is passed in winctx->rx_fifo for receive windows and the virtual address for fault windows which causes errors with DEBUG_VIRTUAL enabled. Fixes this issue by assigning only real address to rx_fifo in vas_rx_win_attr struct for both receive and fault windows. Reported-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Haren Myneni <haren@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/338e958c7ab8f3b266fa794a1f80f99b9671829e.camel@linux.ibm.com
|
#
7bc6f71b |
|
17-Jun-2021 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Define and use common vas_window struct Many elements in vas_struct are used on PowerNV and PowerVM platforms. vas_window is used for both TX and RX windows on PowerNV and for TX windows on PowerVM. So some elements are specific to these platforms. So this patch defines common vas_window and platform specific window structs (pnv_vas_window on PowerNV). Also adds the corresponding changes in PowerNV vas code. Signed-off-by: Haren Myneni <haren@linux.ibm.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1698c35c158dfe52c6d2166667823d3d4a463353.camel@linux.ibm.com
|
#
3856aa54 |
|
17-Jun-2021 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Create take/drop pid and mm reference functions Take pid and mm references when each window opens and drops during close. This functionality is needed for powerNV and pseries. So this patch defines the existing code as functions in common book3s platform vas-api.c Signed-off-by: Haren Myneni <haren@linux.ibm.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/2fa40df962250a737c804e58202924717b39e381.camel@linux.ibm.com
|
#
1a0d0d5e |
|
17-Jun-2021 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Add platform specific user window operations PowerNV uses registers to open/close VAS windows, and getting the paste address. Whereas the hypervisor calls are used on PowerVM. This patch adds the platform specific user space window operations and register with the common VAS user space interface. Signed-off-by: Haren Myneni <haren@linux.ibm.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/f85091f4ace67f951ac04d60394d67b21e2f5d3c.camel@linux.ibm.com
|
#
06c6fad9 |
|
17-Jun-2021 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/powernv/vas: Rename register/unregister functions powerNV and pseries drivers register / unregister to the corresponding platform specific VAS separately. Then these VAS functions call the common API with the specific window operations. So rename powerNV VAS API register/unregister functions. Signed-off-by: Haren Myneni <haren@linux.ibm.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/9db00d58dbdcb7cfc07a1df95f3d2a9e3e5d746a.camel@linux.ibm.com
|
#
91cdbb95 |
|
17-Jun-2021 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/powernv/vas: Release reference to tgid during window close The kernel handles the NX fault by updating CSB or sending signal to process. In multithread applications, children can open VAS windows and can exit without closing them. But the parent can continue to send NX requests with these windows. To prevent pid reuse, reference will be taken on pid and tgid when the window is opened and release them during window close. The current code is not releasing the tgid reference which can cause pid leak and this patch fixes the issue. Fixes: db1c08a740635 ("powerpc/vas: Take reference to PID and mm for user space windows") Cc: stable@vger.kernel.org # 5.8+ Reported-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Haren Myneni <haren@linux.ibm.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/6020fc4d444864fe20f7dcdc5edfe53e67480a1c.camel@linux.ibm.com
|
#
3b70464a |
|
03-Aug-2020 |
Oliver O'Halloran <oohall@gmail.com> |
powerpc/powernv: Staticify functions without prototypes There's a few scattered in the powernv platform. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Reviewed-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200804005410.146094-4-oohall@gmail.com
|
#
dda44eb2 |
|
17-Apr-2020 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Add VAS user space API On power9, userspace can send GZIP compression requests directly to NX once kernel establishes NX channel / window with VAS. This patch provides user space API which allows user space to establish channel using open VAS_TX_WIN_OPEN ioctl, mmap and close operations. Each window corresponds to file descriptor and application can open multiple windows. After the window is opened, VAS_TX_WIN_OPEN icoctl to open a window on specific VAS instance, mmap() system call to map the hardware address of engine's request queue into the application's virtual address space. Then the application can then submit one or more requests to the the engine by using the copy/paste instructions and pasting the CRBs to the virtual address (aka paste_address) returned by mmap(). Only NX GZIP coprocessor type is supported right now and allow GZIP engine access via /dev/crypto/nx-gzip device node. Thanks to Michael Ellerman for his changes and suggestions to make the ioctl generic to support any coprocessor type. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Haren Myneni <haren@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1587114121.2275.1109.camel@hbabu-laptop
|
#
a8c0c69b |
|
17-Apr-2020 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Initialize window attributes for GZIP coprocessor type Initialize send and receive window attributes for GZIP high and normal priority types. Signed-off-by: Haren Myneni <haren@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1587114029.2275.1103.camel@hbabu-laptop
|
#
c420644c |
|
16-Apr-2020 |
Haren Myneni <haren@linux.ibm.com> |
powerpc: Use mm_context vas_windows counter to issue CP_ABORT set_thread_uses_vas() sets used_vas flag for a process that opened VAS window and issue CP_ABORT during context switch for only that process. In multi-thread application, windows can be shared. For example Thread A can open a window and Thread B can run COPY/PASTE instructions to send NX request which may cause corruption or snooping or a covert channel Also once this flag is set, continue to run CP_ABORT even the VAS window is closed. So define vas-windows counter in process mm_context, increment this counter for each window open and decrement it for window close. If vas-windows is set, issue CP_ABORT during context switch. It means clear the foreign real address mapping only if the process / thread uses COPY/PASTE. Then disable it for that process if windows are not open. Moved set_thread_uses_vas() code to vas_tx_win_open() as this functionality is needed only for userspace open windows. We are adding VAS userspace support along with this fix. So no need to include this fix in stable releases. Fixes: 9d2a4d71332c ("powerpc: Define set_thread_uses_vas()") Signed-off-by: Haren Myneni <haren@linux.ibm.com> Reported-by: Nicholas Piggin <npiggin@gmail.com> Suggested-by: Milton Miller <miltonm@us.ibm.com> Suggested-by: Nicholas Piggin <npiggin@gmail.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1587017291.2275.1077.camel@hbabu-laptop
|
#
1d955f98 |
|
16-Apr-2020 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Free send window in VAS instance after credits returned NX may be processing requests while trying to close window. Wait until all credits are returned and then free send window from VAS instance. Signed-off-by: Haren Myneni <haren@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1587017256.2275.1076.camel@hbabu-laptop
|
#
bd4da68d |
|
16-Apr-2020 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Display process stuck message Process can not close send window until all requests are processed. Means wait until window state is not busy and send credits are returned. Display debug messages in case taking longer to close the window. Signed-off-by: Haren Myneni <haren@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1587017219.2275.1073.camel@hbabu-laptop
|
#
04f6296c |
|
16-Apr-2020 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Do not use default credits for receive window System checkstops if RxFIFO overruns with more requests than the maximum possible number of CRBs allowed in FIFO at any time. So max credits value (rxattr.wcreds_max) is set and is passed to vas_rx_win_open() by the the driver. Signed-off-by: Haren Myneni <haren@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1587017136.2275.1070.camel@hbabu-laptop
|
#
461862ef |
|
16-Apr-2020 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Return credits after handling fault NX uses credit mechanism to control the number of requests issued on a specific window at any point of time. Only send windows and fault window are used credits. When the request is issued on a given window, a credit is taken. This credit will be returned after that request is processed. If credits are not available, returns RMA_Busy for send window and RMA_Reject for fault window. NX expects OS to return credit for send window after processing fault CRB. Also credit has to be returned for fault window after handling the fault. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Haren Myneni <haren@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1587017059.2275.1064.camel@hbabu-laptop
|
#
9774628a |
|
16-Apr-2020 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Setup thread IRQ handler per VAS instance When NX encounters translation error on CRB and any request buffer, raises an interrupt on the CPU to handle the fault. It can raise one interrupt for multiple faults. Expects OS to handle these faults and return credits for fault window after processing faults. Setup thread IRQ handler and IRQ thread function per each VAS instance. IRQ handler checks if the thread is already woken up and can handle new faults. If so returns with IRQ_HANDLED, otherwise wake up thread to process new faults. The thread functions reads each CRB entry from fault FIFO until sees invalid entry. After reading each CRB, determine the corresponding send window using pswid (from CRB) and process fault CRB. Then invalidate the entry and return credit. Processing fault CRB and return credit is described in subsequent patches. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Haren Myneni <haren@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1587016982.2275.1060.camel@hbabu-laptop
|
#
db1c08a7 |
|
16-Apr-2020 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Take reference to PID and mm for user space windows When process opens a window, its pid and tgid will be saved in the vas_window struct. This window will be closed when the process exits. The kernel handles NX faults by updating CSB or send SEGV signal to pid of the process if the userspace csb addr is invalid. In multi-thread applications, a window can be opened by a child thread, but it will not be closed when this thread exits. It is expected that the parent will clean up all resources including NX windows opened by child threads. A child thread can send NX requests using this window and could be killed before completion is reported. If the pid assigned to this thread is reused while requests are pending, a failure SEGV would be directed to the wrong place. To prevent reusing the pid, take references to pid and mm when the window is opened and release them when when the window is closed. Then if child thread is not running, SEGV signal will be sent to thread group leader (tgid). Signed-off-by: Haren Myneni <haren@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1587016936.2275.1057.camel@hbabu-laptop
|
#
8b8a73dc |
|
16-Apr-2020 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Register NX with fault window ID and IRQ port value For each user space send window, register NX with fault window ID and port value so that NX paste CRBs in this fault FIFO when it sees fault on the request buffer. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Haren Myneni <haren@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1587016888.2275.1054.camel@hbabu-laptop
|
#
0d17de03 |
|
16-Apr-2020 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Setup fault window per VAS instance Setup fault window for each VAS instance. When NX gets a fault on request buffer, pastes fault CRB in the corresponding fault FIFO and then raises an interrupt to the OS. The kernel handles this fault and process faults CRB from this FIFO. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Haren Myneni <haren@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1587016846.2275.1053.camel@hbabu-laptop
|
#
452d23c0 |
|
25-Jun-2019 |
Christoph Hellwig <hch@lst.de> |
powerpc/powernv: remove the unused vas_win_paste_addr and vas_win_id functions These two function have never been used anywhere in the kernel tree since they were added to the kernel. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
2874c5fd |
|
27-May-2019 |
Thomas Gleixner <tglx@linutronix.de> |
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
#
cd38049e |
|
18-Jun-2018 |
Matthew Wilcox <willy@infradead.org> |
ppc: Convert vas ID allocation to new IDA API Removes a custom spinlock and simplifies the code. Also fix an error where we could allocate one ID too many. Signed-off-by: Matthew Wilcox <willy@infradead.org>
|
#
007bb7d6 |
|
09-Feb-2018 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/vas: Add a couple of trace points Add a couple of trace points in the VAS driver Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> [mpe: Add SPDX tag to new header] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
b00b6289 |
|
08-Feb-2018 |
Nicholas Piggin <npiggin@gmail.com> |
powerpc/vas: Don't set uses_vas for kernel windows cp_abort is only required for user windows, because kernel context must not be preempted between a copy/paste pair. Without this patch, the init task gets used_vas set when it runs the nx842_powernv_init initcall, which opens windows for kernel usage. used_vas is then never cleared anywhere, so it gets propagated into all other tasks. It's a property of the address space, so it should really be cleared when a new mm is created (or in dup_mmap if the mmaps are marked as VM_DONTCOPY). For now we seem to have no such driver, so leave that for another patch. Fixes: 6c8e6bb2a52d ("powerpc/vas: Add support for user receive window") Cc: stable@vger.kernel.org # v4.15+ Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Reviewed-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
6c8e6bb2 |
|
07-Nov-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/vas: Add support for user receive window Add support for user space receive window (for the Fast thread-wakeup coprocessor type) Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
61f3cca8 |
|
07-Nov-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/vas: Define vas_win_id() Define an interface to return a system-wide unique id for a given VAS window. The vas_win_id() will be used in a follow-on patch to generate an unique handle for a user space receive window. Applications can use this handle to pair send and receive windows for fast thread-wakeup. The hardware refers to this system-wide unique id as a Partition Send Window ID which is expected to be used during fault handling. Hence the "pswid" in the function names. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
5676be2f |
|
07-Nov-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/vas: Define vas_win_paste_addr() Define an interface that the NX drivers can use to find the physical paste address of a send window. This interface is expected to be used with the mmap() operation of the NX driver's device. i.e the user space process can use driver's mmap() operation to map the send window's paste address into their address space and then use copy and paste instructions to submit the CRBs to the NX engine. Note that kernel drivers will use vas_paste_crb() directly and don't need this interface. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
ece4e512 |
|
07-Nov-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/vas: Export HVWC to debugfs Export the VAS Window context information to debugfs. We need to hold a mutex when closing the window to prevent a race with the debugfs read(). Rather than introduce a per-instance mutex, we use the global vas_mutex for now, since it is not heavily contended. The window->cop field is only relevant to a receive window so we were not setting it for a send window (which is is paired to a receive window anyway). But to simplify reporting in debugfs, set the 'cop' field for the send window also. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
6fccac16 |
|
07-Nov-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/vas: poll for return of window credits Normally, the NX driver waits for the CRBs to be processed before closing the window. But it is better to ensure that the credits are returned before the window gets reassigned later. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
62f659e0 |
|
07-Nov-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/vas: Save configured window credits Save the configured max window credits for a window in the vas_window structure. We will need this when polling for return of window credits. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
dfe954e4 |
|
07-Nov-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/vas: Reduce polling interval for busy state A VAS window is normally in "busy" state for only a short duration. Reduce the time we wait for the window to go to "not-busy" state to speed-up vas_win_close() a bit. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
36a288fe |
|
07-Nov-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/vas: Use helper to unpin/close window Use a helper to have the hardware unpin and mark a window closed. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
4963ac36 |
|
07-Nov-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/vas: Drop poll_window_cast_out(). Polling for window cast out is listed in the spec, but turns out that it is not strictly necessary and slows down window close. Making it a stub for now. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
0a2c2c24 |
|
07-Nov-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/vas: Cleanup some debug code Clean up vas.h and the debug code around ifdef vas_debug. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
51b53712 |
|
07-Nov-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/vas: Validate window credits NX-842, the only user of VAS, sets the window credits to default values but VAS should check the credits against the possible max values. The VAS_WCREDS_MIN is not needed and can be dropped. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
e34917fb |
|
07-Nov-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/vas: init missing fields from [rt]xattr Initialize a few missing window context fields from the window attributes specified by the caller. These fields are currently set to their default values by the caller (NX-842), but would be good to apply them anyway. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
2392c8c8 |
|
29-Aug-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/powernv/vas: Define copy/paste interfaces Define interfaces (wrappers) to the 'copy' and 'paste' instructions (which are new in PowerISA 3.0). These are intended to be used to by NX driver(s) to submit Coprocessor Request Blocks (CRBs) to the NX hardware engines. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
5239af67 |
|
29-Aug-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/powernv/vas: Define vas_tx_win_open() Define an interface to open a VAS send window. This interface is intended to be used the Nest Accelerator (NX) driver(s) to open a send window and use it to submit compression/encryption requests to a VAS receive window. The receive window, identified by the [vasid, cop] parameters, must already be open in VAS (i.e connected to an NX engine). Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
98271d41 |
|
29-Aug-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/powernv/vas: Define vas_win_close() interface Define the vas_win_close() interface which should be used to close a send or receive windows. While the hardware configurations required to open send and receive windows differ, the configuration to close a window is the same for both. So we use a single interface to close the window. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
62c4eda4 |
|
29-Aug-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/powernv/vas: Define vas_rx_win_open() interface Define the vas_rx_win_open() interface. This interface is intended to be used by the Nest Accelerator (NX) driver(s) to setup receive windows for one or more NX engines (which implement compression & encryption algorithms in the hardware). Follow-on patches will provide an interface to close the window and to open a send window that kernel subsystems can use to access the NX engines. The interface to open a receive window is expected to be invoked for each instance of VAS in the system. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
bbfe59f8 |
|
29-Aug-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/powernv/vas: Define helpers to alloc/free windows Define helpers to allocate/free VAS window objects. These will be used in follow-on patches when opening/closing windows. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
b25b33ac |
|
29-Aug-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/powernv/vas: Define helpers to init window context Define helpers to initialize window context registers of the VAS hardware. These will be used in follow-on patches when opening/closing VAS windows. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
180fe15a |
|
29-Aug-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/powernv/vas: Define helpers to access MMIO regions Define some helper functions to access the MMIO regions. We use these in follow-on patches to read/write VAS hardware registers. They are also used to later issue 'paste' instructions to submit requests to the NX hardware engines. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|
#
4dea2d1a |
|
29-Aug-2017 |
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> |
powerpc/powernv/vas: Define vas_init() and vas_exit() Implement vas_init() and vas_exit() functions for a new VAS module. This VAS module is essentially a library for other device drivers and kernel users of the NX coprocessors like NX-842 and NX-GZIP. In the future this will be extended to add support for user space to access the NX coprocessors. VAS is currently only supported with 64K page size. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
|