Hosts the 0x221E linux distro kernel. https://git.0xinfinity.dev/distro/kernel.git/atom?h=linux-5.16.y 2021-04-14T13:04:16Z 2021-04-14T13:04:16Z Nathan Lynch 2021-04-08T14:06:30Z urn:sha1:e5d56763525e65417dad0d46572b234fa0008e40 RTAS_RMOBUF_MAX doesn't actually describe a "maximum" value in any sense. It represents the size of an area of memory set aside for user space to use as work areas for certain RTAS calls. Rename it to RTAS_USER_REGION_SIZE. Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com> Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210408140630.205502-6-nathanl@linux.ibm.com 2021-02-08T13:10:50Z Chengyang Fan 2021-01-25T09:53:38Z urn:sha1:6c6fdbb2b7002aa04e418b5d2b26df1c5ba5ab80 Remove superfluous semicolons after function definitions. Signed-off-by: Chengyang Fan <cy.fan@huawei.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210125095338.1719405-1-cy.fan@huawei.com 2020-12-08T10:41:01Z Nathan Lynch 2020-12-07T21:51:55Z urn:sha1:1b2488176ea56e299d2b084772daeb5ecbfc16d1 rtas_suspend_last_cpu() is now unused, remove it and __rtas_suspend_last_cpu() which also becomes unused. Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201207215200.1785968-24-nathanl@linux.ibm.com 2020-12-08T10:41:01Z Nathan Lynch 2020-12-07T21:51:53Z urn:sha1:395b2c090907975c627902ba8fda0bdb04c7cad3 rtas_suspend_cpu() no longer has users; remove it and __rtas_suspend_cpu() which now becomes unused as well. Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201207215200.1785968-22-nathanl@linux.ibm.com 2020-12-08T10:40:59Z Nathan Lynch 2020-12-07T21:51:48Z urn:sha1:5f6665e400569de479733677e77862542aebb6cc rtas_ibm_suspend_me_unsafe() is now unused; remove it and rtas_percpu_suspend_me() which becomes unused as a result. Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201207215200.1785968-17-nathanl@linux.ibm.com 2020-12-08T10:40:59Z Nathan Lynch 2020-12-07T21:51:47Z urn:sha1:4d756894ba75f1afe7945ccafe9afebff50484b6 sys_rtas() cannot call ibm,suspend-me directly in the same way it handles other inputs. Instead it must dispatch the request to code that can first perform the H_JOIN sequence before any call to ibm,suspend-me can succeed. Over time kernel/rtas.c has accreted a fair amount of platform-specific code to implement this. Since a different, more robust implementation of the suspend sequence is now in the pseries platform code, we want to dispatch the request there. Note that invoking ibm,suspend-me via the RTAS syscall is all but deprecated; this change preserves ABI compatibility for old programs while providing to them the benefit of the new partition suspend implementation. This is a behavior change in that the kernel performs the device tree update and firmware activation before returning, but experimentation indicates this is tolerated fine by legacy user space. Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201207215200.1785968-16-nathanl@linux.ibm.com 2020-12-08T10:40:55Z Nathan Lynch 2020-12-07T21:51:37Z urn:sha1:5f485a66f4d0693a535e4ab38ffc3538716d2c2b Provide a documented wrapper function for the ibm,activate-firmware service, which must be called after a partition migration or hibernation. If the function is absent or the call fails, the OS will continue to run normally with the current firmware, so there is no need to perform any recovery. Just log it and continue. Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201207215200.1785968-6-nathanl@linux.ibm.com 2020-12-08T10:40:55Z Nathan Lynch 2020-12-07T21:51:36Z urn:sha1:701ba68342412ae9be99a7c7f3badebf95271403 Now that the name is available, provide a simple wrapper for ibm,suspend-me which returns both a Linux errno and optionally the actual RTAS status to the caller. Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201207215200.1785968-5-nathanl@linux.ibm.com 2020-12-08T10:40:54Z Nathan Lynch 2020-12-07T21:51:35Z urn:sha1:7049b288ea8c95f270ec8fe643e3c3187938d5af The pseries partition suspend sequence requires that all active CPUs call H_JOIN, which suspends all but one of them with interrupts disabled. The "chosen" CPU is then to call ibm,suspend-me to complete the suspend. Upon returning from ibm,suspend-me, the chosen CPU is to use H_PROD to wake the joined CPUs. Using on_each_cpu() for this, as rtas_ibm_suspend_me() does to implement partition migration, is susceptible to deadlock with other users of on_each_cpu() and with users of stop_machine APIs. The callback passed to on_each_cpu() is not allowed to synchronize with other CPUs in the way it is used here. Complicating the fix is the fact that rtas_ibm_suspend_me() also occupies the function name that should be used to provide a more conventional wrapper for ibm,suspend-me. Rename rtas_ibm_suspend_me() to rtas_ibm_suspend_me_unsafe() to free up the name and indicate that it should not gain users. Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201207215200.1785968-4-nathanl@linux.ibm.com 2020-12-08T10:40:54Z Nathan Lynch 2020-12-07T21:51:34Z urn:sha1:970e453ea4ecdd7a16a46c229294547148d1c7b6 We don't completely account for the possible return codes for ibm,suspend-me. Add definitions for these. Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201207215200.1785968-3-nathanl@linux.ibm.com