kernel/arch/powerpc/platforms/book3s, branch linux-6.2.y

driver core: fix up some missing class.devnode() conversions.

2022-11-29T08:28:46Z

In commit ff62b8e6588f ("driver core: make struct class.devnode() take a const *") the ->devnode callback changed the pointer to be const, but a few instances of PowerPC drivers were not caught for some reason. Fix this up by changing the pointers to be const. Fixes: ff62b8e6588f ("driver core: make struct class.devnode() take a const *") Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Cc: Frederic Barrat Cc: Andrew Donnellan Cc: Arnd Bergmann Cc: linuxppc-dev@lists.ozlabs.org Reported-by: Stephen Rothwell Link: https://lore.kernel.org/r/20221128173539.3112234-1-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman

powerpc/vas: fix repeated words in comments

2022-09-06T01:03:04Z

Delete the redundant word 'the'. Signed-off-by: Jilin Yuan Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220831004914.37055-1-yuanjilin@cdjrlc.com

powerpc: fix typos in comments

2022-05-05T12:12:44Z

Various spelling mistakes in comments. Detected with the help of Coccinelle. Signed-off-by: Julia Lawall Reviewed-by: Joel Stanley Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220430185654.5855-1-Julia.Lawall@inria.fr

powerpc/vas: Map paste address only if window is active

2022-03-07T13:04:55Z

The paste address mapping is done with mmap() after the window is opened with ioctl. The partition has to close VAS windows in the hypervisor if it lost credits due to DLPAR core removal. But the kernel marks these windows inactive until the previously lost credits are available later. If the window is inactive due to DLPAR after this mmap(), the paste instruction returns failure until the the OS reopens this window again. Before the user space issuing mmap(), there is a possibility of happening DLPAR core removal event which causes the corresponding window inactive. So if the window is not active, return mmap() failure with -EACCES and expects the user space reissue mmap() when the window is active or open a new window when the credit is available. Signed-off-by: Haren Myneni Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/bbb203c26b324534e25658cb1dbbcb5160a2f93a.camel@linux.ibm.com

powerpc/vas: Return paste instruction failure if no active window

2022-03-07T13:04:55Z

The VAS window may not be active if the system looses credits and the NX generates page fault when it receives request on unmap paste address. The kernel handles the fault by remap new paste address if the window is active again, Otherwise return the paste instruction failure if the executed instruction that caused the fault was a paste. Signed-off-by: Nicholas Piggin Signed-off-by: Haren Myneni Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/492b9aefd593061d51dda67ee4d2fc449c000dce.camel@linux.ibm.com

powerpc/vas: Add paste address mmap fault handler

2022-03-07T13:04:55Z

The user space opens VAS windows and issues NX requests by pasting CRB on the corresponding paste address mmap. When the system lost credits due to core removal, the kernel has to close the window in the hypervisor and make the window inactive by unmapping this paste address. Also the OS has to handle NX request page faults if the user space issue NX requests. This handler maps the new paste address with the same VMA when the window is active again (due to core add with DLPAR). Otherwise returns paste failure. Signed-off-by: Haren Myneni Reviewed-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/3956e1c1fdfde69127055ff1c0256c7d71104030.camel@linux.ibm.com

powerpc/vas: Fix potential NULL pointer dereference

2021-10-22T04:22:04Z

(!ptr && !ptr->foo) strikes again. :) The expression (!ptr && !ptr->foo) is bogus and in case ptr is NULL, it leads to a NULL pointer dereference: ptr->foo. Fix this by converting && to || This issue was detected with the help of Coccinelle, and audited and fixed manually. Fixes: 1a0d0d5ed5e3 ("powerpc/vas: Add platform specific user window operations") Cc: stable@vger.kernel.org Signed-off-by: Gustavo A. R. Silva Reviewed-by: Tyrel Datwyler Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20211015050345.GA1161918@embeddedor

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