kernel.git/arch/powerpc/include/asm/vas.h, branch linux-5.17.y

powerpc/powernv/vas: Assign real address to rx_fifo in vas_rx_win_attr

2022-06-09T08:25:34Z

[ Upstream commit c127d130f6d59fa81701f6b04023cf7cd1972fb3 ] 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 Signed-off-by: Haren Myneni Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/338e958c7ab8f3b266fa794a1f80f99b9671829e.camel@linux.ibm.com Signed-off-by: Sasha Levin

powerpc/pseries/vas: Integrate API with open/close windows

2021-06-20T11:58:57Z

This patch adds VAS window allocatioa/close with the corresponding hcalls. Also changes to integrate with the existing user space VAS API and provide register/unregister functions to NX pseries driver. The driver register function is used to create the user space interface (/dev/crypto/nx-gzip) and unregister to remove this entry. The user space process opens this device node and makes an ioctl to allocate VAS window. The close interface is used to deallocate window. Signed-off-by: Haren Myneni Reviewed-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/e8d956bace3f182c4d2e66e343ff37cb0391d1fd.camel@linux.ibm.com

powerpc/pseries/vas: Define VAS/NXGZIP hcalls and structs

2021-06-20T11:58:56Z

This patch adds hcalls and other definitions. Also define structs that are used in VAS implementation on PowerVM. Signed-off-by: Haren Myneni Acked-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/b4b8c594c27ee4aa6be9dc6dc4ee7331571cbbe8.camel@linux.ibm.com

powerpc/vas: Define and use common vas_window struct

2021-06-20T11:58:56Z

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 Reviewed-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/1698c35c158dfe52c6d2166667823d3d4a463353.camel@linux.ibm.com

powerpc/vas: Move update_csb/dump_crb to common book3s platform

2021-06-20T11:58:56Z

If a coprocessor encounters an error translating an address, the VAS will cause an interrupt in the host. The kernel processes the fault by updating CSB. This functionality is same for both powerNV and pseries. So this patch moves these functions to common vas-api.c and the actual functionality is not changed. Signed-off-by: Haren Myneni Reviewed-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/bf8d5b0770fa1ef5cba88c96580caa08d999d3b5.camel@linux.ibm.com

powerpc/vas: Create take/drop pid and mm reference functions

2021-06-20T11:58:56Z

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 Reviewed-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/2fa40df962250a737c804e58202924717b39e381.camel@linux.ibm.com

powerpc/vas: Add platform specific user window operations

2021-06-20T11:58:55Z

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 Reviewed-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/f85091f4ace67f951ac04d60394d67b21e2f5d3c.camel@linux.ibm.com

powerpc/powernv/vas: Rename register/unregister functions

2021-06-20T11:58:55Z

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 Reviewed-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/9db00d58dbdcb7cfc07a1df95f3d2a9e3e5d746a.camel@linux.ibm.com

powerpc/vas: Move VAS API to book3s common platform

2021-06-20T11:58:55Z

The pseries platform will share vas and nx code and interfaces with the PowerNV platform, so create the arch/powerpc/platforms/book3s/ directory and move VAS API code there. Functionality is not changed. Signed-off-by: Haren Myneni Reviewed-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/e05c8db17b9eabe3545b902d034238e4c6c08180.camel@linux.ibm.com

crypto/nx: Remove 'pid' in vas_tx_win_attr struct

2020-04-20T06:53:14Z

When window is opened, pid reference is taken for user space windows. Not needed for kernel windows. So remove 'pid' in vas_tx_win_attr struct. Signed-off-by: Haren Myneni Acked-by: Herbert Xu Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/1587114674.2275.1132.camel@hbabu-laptop