forked from luck/tmp_suning_uos_patched
2275d7b575
Introduce two options to control the use of the tlbie instruction. A boot time option which completely disables the kernel using the instruction, this is currently incompatible with HASH MMU, KVM, and coherent accelerators. And a debugfs option can be switched at runtime and avoids using tlbie for invalidating CPU TLBs for normal process and kernel address mappings. Coherent accelerators are still managed with tlbie, as will KVM partition scope translations. Cross-CPU TLB flushing is implemented with IPIs and tlbiel. This is a basic implementation which does not attempt to make any optimisation beyond the tlbie implementation. This is useful for performance testing among other things. For example in certain situations on large systems, using IPIs may be faster than tlbie as they can be directed rather than broadcast. Later we may also take advantage of the IPIs to do more interesting things such as trim the mm cpumask more aggressively. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190902152931.17840-7-npiggin@gmail.com
38 lines
621 B
C
38 lines
621 B
C
// SPDX-License-Identifier: GPL-2.0+
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// Copyright 2017 IBM Corp.
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <asm/mmu.h>
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#include "ocxl_internal.h"
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static int __init init_ocxl(void)
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{
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int rc = 0;
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if (!tlbie_capable)
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return -EINVAL;
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rc = ocxl_file_init();
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if (rc)
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return rc;
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rc = pci_register_driver(&ocxl_pci_driver);
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if (rc) {
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ocxl_file_exit();
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return rc;
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}
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return 0;
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}
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static void exit_ocxl(void)
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{
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pci_unregister_driver(&ocxl_pci_driver);
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ocxl_file_exit();
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}
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module_init(init_ocxl);
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module_exit(exit_ocxl);
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MODULE_DESCRIPTION("Open Coherent Accelerator");
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MODULE_LICENSE("GPL");
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