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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-04-13 09:59:31 +00:00
5a0fcb0ef5
Remove the cxl driver that provides support for the IBM Coherent Accelerator Processor Interface. Revert or clean up associated code in arch/powerpc that is no longer necessary. cxl has received minimal maintenance for several years, and is not supported on the Power10 processor. We aren't aware of any users who are likely to be using recent kernels. Thanks to Mikey Neuling, Ian Munsie, Daniel Axtens, Frederic Barrat, Christophe Lombard, Philippe Bergheaud, Vaibhav Jain and Alastair D'Silva for their work on this driver over the years. Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com> Acked-by: Frederic Barrat <fbarrat@linux.ibm.com> Acked-by: Madhavan Srinivasan <maddy@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://patch.msgid.link/20250219070007.177725-2-ajd@linux.ibm.com
136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* CoProcessor (SPU/AFU) mm fault handler
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*
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2007
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*
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* Author: Arnd Bergmann <arndb@de.ibm.com>
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* Author: Jeremy Kerr <jk@ozlabs.org>
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*/
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/export.h>
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#include <asm/reg.h>
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#include <asm/copro.h>
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/*
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* This ought to be kept in sync with the powerpc specific do_page_fault
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* function. Currently, there are a few corner cases that we haven't had
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* to handle fortunately.
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*/
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int copro_handle_mm_fault(struct mm_struct *mm, unsigned long ea,
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unsigned long dsisr, vm_fault_t *flt)
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{
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struct vm_area_struct *vma;
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unsigned long is_write;
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int ret;
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if (mm == NULL)
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return -EFAULT;
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if (mm->pgd == NULL)
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return -EFAULT;
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vma = lock_mm_and_find_vma(mm, ea, NULL);
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if (!vma)
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return -EFAULT;
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ret = -EFAULT;
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is_write = dsisr & DSISR_ISSTORE;
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if (is_write) {
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if (!(vma->vm_flags & VM_WRITE))
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goto out_unlock;
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} else {
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if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
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goto out_unlock;
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/*
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* PROT_NONE is covered by the VMA check above.
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* and hash should get a NOHPTE fault instead of
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* a PROTFAULT in case fixup is needed for things
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* like autonuma.
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*/
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if (!radix_enabled())
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WARN_ON_ONCE(dsisr & DSISR_PROTFAULT);
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}
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ret = 0;
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*flt = handle_mm_fault(vma, ea, is_write ? FAULT_FLAG_WRITE : 0, NULL);
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/* The fault is fully completed (including releasing mmap lock) */
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if (*flt & VM_FAULT_COMPLETED)
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return 0;
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if (unlikely(*flt & VM_FAULT_ERROR)) {
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if (*flt & VM_FAULT_OOM) {
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ret = -ENOMEM;
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goto out_unlock;
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} else if (*flt & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) {
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ret = -EFAULT;
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goto out_unlock;
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}
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BUG();
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}
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out_unlock:
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mmap_read_unlock(mm);
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return ret;
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}
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EXPORT_SYMBOL_GPL(copro_handle_mm_fault);
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#ifdef CONFIG_PPC_64S_HASH_MMU
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int copro_calculate_slb(struct mm_struct *mm, u64 ea, struct copro_slb *slb)
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{
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u64 vsid, vsidkey;
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int psize, ssize;
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switch (get_region_id(ea)) {
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case USER_REGION_ID:
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pr_devel("%s: 0x%llx -- USER_REGION_ID\n", __func__, ea);
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if (mm == NULL)
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return 1;
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psize = get_slice_psize(mm, ea);
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ssize = user_segment_size(ea);
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vsid = get_user_vsid(&mm->context, ea, ssize);
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vsidkey = SLB_VSID_USER;
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break;
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case VMALLOC_REGION_ID:
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pr_devel("%s: 0x%llx -- VMALLOC_REGION_ID\n", __func__, ea);
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psize = mmu_vmalloc_psize;
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ssize = mmu_kernel_ssize;
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vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
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vsidkey = SLB_VSID_KERNEL;
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break;
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case IO_REGION_ID:
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pr_devel("%s: 0x%llx -- IO_REGION_ID\n", __func__, ea);
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psize = mmu_io_psize;
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ssize = mmu_kernel_ssize;
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vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
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vsidkey = SLB_VSID_KERNEL;
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break;
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case LINEAR_MAP_REGION_ID:
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pr_devel("%s: 0x%llx -- LINEAR_MAP_REGION_ID\n", __func__, ea);
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psize = mmu_linear_psize;
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ssize = mmu_kernel_ssize;
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vsid = get_kernel_vsid(ea, mmu_kernel_ssize);
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vsidkey = SLB_VSID_KERNEL;
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break;
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default:
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pr_debug("%s: invalid region access at %016llx\n", __func__, ea);
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return 1;
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}
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/* Bad address */
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if (!vsid)
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return 1;
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vsid = (vsid << slb_vsid_shift(ssize)) | vsidkey;
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vsid |= mmu_psize_defs[psize].sllp |
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((ssize == MMU_SEGSIZE_1T) ? SLB_VSID_B_1T : 0);
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slb->esid = (ea & (ssize == MMU_SEGSIZE_1T ? ESID_MASK_1T : ESID_MASK)) | SLB_ESID_V;
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slb->vsid = vsid;
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return 0;
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}
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EXPORT_SYMBOL_GPL(copro_calculate_slb);
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#endif
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