kernel/linux.git/drivers/misc/cxl/context.c, branch v5.4.232

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30T18:26:32+00:00

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 Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman

cxl: Remove abandonned capi support for the Mellanox CX4, final cleanup

2018-07-02T13:54:33+00:00

Remove a few XSL/CX4 oddities which are no longer needed. A simple revert of the initial commits was not possible (or not worth it) due to the history of the code. Signed-off-by: Frederic Barrat Acked-by: Andrew Donnellan Signed-off-by: Michael Ellerman

Revert "cxl: Add preliminary workaround for CX4 interrupt limitation"

2018-07-02T13:54:31+00:00

Remove abandonned capi support for the Mellanox CX4. This reverts commit cbce0917e2e47d4bf5aa3b5fd6b1247f33e1a126. Signed-off-by: Alastair D'Silva Acked-by: Andrew Donnellan Signed-off-by: Michael Ellerman

misc: cxl: Change return type to vm_fault_t

2018-04-23T11:31:27+00:00

Use new return type vm_fault_t for fault handler. For now, this is just documenting that the function returns a VM_FAULT value rather than an errno. Once all instances are converted, vm_fault_t will become a distinct type. Reference id -> 1c8f422059ae ("mm: change return type to vm_fault_t") previously cxl_mmap_fault returns VM_FAULT_NOPAGE as default value irrespective of vm_insert_pfn() return value. This bug is fixed with new vmf_insert_pfn() which will return VM_FAULT_ type based on err. Signed-off-by: Souptick Joarder Acked-by: Andrew Donnellan Signed-off-by: Greg Kroah-Hartman

cxl: Add support for ASB_Notify on POWER9

2018-01-19T12:19:37+00:00

The POWER9 core supports a new feature: ASB_Notify which requires the support of the Special Purpose Register: TIDR. The ASB_Notify command, generated by the AFU, will attempt to wake-up the host thread identified by the particular LPID:PID:TID. This patch assign a unique TIDR (thread id) for the current thread which will be used in the process element entry. Signed-off-by: Christophe Lombard Reviewed-by: Philippe Bergheaud Acked-by: Frederic Barrat Reviewed-by: Vaibhav Jain Acked-by: Andrew Donnellan Signed-off-by: Michael Ellerman

cxl: Enable global TLBIs for cxl contexts

2017-09-28T07:09:16+00:00

The PSL and nMMU need to see all TLB invalidations for the memory contexts used on the adapter. For the hash memory model, it is done by making all TLBIs global as soon as the cxl driver is in use. For radix, we need something similar, but we can refine and only convert to global the invalidations for contexts actually used by the device. The new mm_context_add_copro() API increments the 'active_cpus' count for the contexts attached to the cxl adapter. As soon as there's more than 1 active cpu, the TLBIs for the context become global. Active cpu count must be decremented when detaching to restore locality if possible and to avoid overflowing the counter. The hash memory model support is somewhat limited, as we can't decrement the active cpus count when mm_context_remove_copro() is called, because we can't flush the TLB for a mm on hash. So TLBIs remain global on hash. Signed-off-by: Frederic Barrat Fixes: f24be42aab37 ("cxl: Add psl9 specific code") Tested-by: Alistair Popple [mpe: Fold in updated comment on the barrier from Fred] Signed-off-by: Michael Ellerman

cxl: Fixes for Coherent Accelerator Interface Architecture 2.0

2017-06-23T06:26:23+00:00

A previous set of patches "cxl: Add support for Coherent Accelerator Interface Architecture 2.0" has introduced a new support for the CAPI cards. These patches have been tested on Simulation environment and quite a bit of them have been tested on real hardware. This patch brings new fixes after a series of tests carried out on new equipment: - Add POWER9 definition. - Re-enable any masked interrupts when the AFU is not activated after resetting the AFU. - Remove the api cxl_is_psl8/9 which is no longer useful. - Do not dump CAPI1 registers. - Rewrite cxl_is_page_fault() function. - Do not register slb callack on P9. Fixes: f24be42aab37 ("cxl: Add psl9 specific code") Signed-off-by: Christophe Lombard Acked-by: Frederic Barrat Signed-off-by: Michael Ellerman

cxl: Add psl9 specific code

2017-04-13T13:34:31+00:00

The new Coherent Accelerator Interface Architecture, level 2, for the IBM POWER9 brings new content and features: - POWER9 Service Layer - Registers - Radix mode - Process element entry - Dedicated-Shared Process Programming Model - Translation Fault Handling - CAPP - Memory Context ID If a valid mm_struct is found the memory context id is used for each transaction associated with the process handle. The PSL uses the context ID to find the corresponding process element. Signed-off-by: Christophe Lombard Acked-by: Frederic Barrat [mpe: Fixup comment formatting, unsplit long strings] Signed-off-by: Michael Ellerman

cxl: Isolate few psl8 specific calls

2017-04-13T13:34:30+00:00

Point out the specific Coherent Accelerator Interface Architecture, level 1, registers. Code and functions specific to PSL8 (CAIA1) must be framed. Signed-off-by: Christophe Lombard Acked-by: Frederic Barrat [mpe: Don't split long strings, it makes them hard to grep for] Signed-off-by: Michael Ellerman

cxl: Keep track of mm struct associated with a context

2017-04-13T13:34:29+00:00

The mm_struct corresponding to the current task is acquired each time an interrupt is raised. So to simplify the code, we only get the mm_struct when attaching an AFU context to the process. The mm_count reference is increased to ensure that the mm_struct can't be freed. The mm_struct will be released when the context is detached. A reference on mm_users is not kept to avoid a circular dependency if the process mmaps its cxl mmio and forget to unmap before exiting. The field glpid (pid of the group leader associated with the pid), of the structure cxl_context, is removed because it's no longer useful. Signed-off-by: Christophe Lombard Reviewed-by: Andrew Donnellan Acked-by: Frederic Barrat Signed-off-by: Michael Ellerman