diff options
Diffstat (limited to 'arch/openrisc/kernel')
| -rw-r--r-- | arch/openrisc/kernel/.gitignore | 1 | ||||
| -rw-r--r-- | arch/openrisc/kernel/dma.c | 55 | ||||
| -rw-r--r-- | arch/openrisc/kernel/process.c | 18 | ||||
| -rw-r--r-- | arch/openrisc/kernel/smp.c | 3 | ||||
| -rw-r--r-- | arch/openrisc/kernel/traps.c | 7 |
5 files changed, 19 insertions, 65 deletions
diff --git a/arch/openrisc/kernel/.gitignore b/arch/openrisc/kernel/.gitignore index c5f676c3c224..bbb90f92d051 100644 --- a/arch/openrisc/kernel/.gitignore +++ b/arch/openrisc/kernel/.gitignore @@ -1 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only vmlinux.lds diff --git a/arch/openrisc/kernel/dma.c b/arch/openrisc/kernel/dma.c index adec711ad39d..c152a68811dd 100644 --- a/arch/openrisc/kernel/dma.c +++ b/arch/openrisc/kernel/dma.c @@ -11,8 +11,6 @@ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> * * DMA mapping callbacks... - * As alloc_coherent is the only DMA callback being used currently, that's - * the only thing implemented properly. The rest need looking into... */ #include <linux/dma-noncoherent.h> @@ -67,62 +65,29 @@ static const struct mm_walk_ops clear_nocache_walk_ops = { .pte_entry = page_clear_nocache, }; -/* - * Alloc "coherent" memory, which for OpenRISC means simply uncached. - * - * This function effectively just calls __get_free_pages, sets the - * cache-inhibit bit on those pages, and makes sure that the pages are - * flushed out of the cache before they are used. - * - * If the NON_CONSISTENT attribute is set, then this function just - * returns "normal", cachable memory. - * - * There are additional flags WEAK_ORDERING and WRITE_COMBINE to take - * into consideration here, too. All current known implementations of - * the OR1K support only strongly ordered memory accesses, so that flag - * is being ignored for now; uncached but write-combined memory is a - * missing feature of the OR1K. - */ -void * -arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, - gfp_t gfp, unsigned long attrs) +void *arch_dma_set_uncached(void *cpu_addr, size_t size) { - unsigned long va; - void *page; - - page = alloc_pages_exact(size, gfp | __GFP_ZERO); - if (!page) - return NULL; - - /* This gives us the real physical address of the first page. */ - *dma_handle = __pa(page); - - va = (unsigned long)page; + unsigned long va = (unsigned long)cpu_addr; + int error; /* * We need to iterate through the pages, clearing the dcache for * them and setting the cache-inhibit bit. */ - if (walk_page_range(&init_mm, va, va + size, &set_nocache_walk_ops, - NULL)) { - free_pages_exact(page, size); - return NULL; - } - - return (void *)va; + error = walk_page_range(&init_mm, va, va + size, &set_nocache_walk_ops, + NULL); + if (error) + return ERR_PTR(error); + return cpu_addr; } -void -arch_dma_free(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_handle, unsigned long attrs) +void arch_dma_clear_uncached(void *cpu_addr, size_t size) { - unsigned long va = (unsigned long)vaddr; + unsigned long va = (unsigned long)cpu_addr; /* walk_page_range shouldn't be able to fail here */ WARN_ON(walk_page_range(&init_mm, va, va + size, &clear_nocache_walk_ops, NULL)); - - free_pages_exact(vaddr, size); } void arch_sync_dma_for_device(phys_addr_t addr, size_t size, diff --git a/arch/openrisc/kernel/process.c b/arch/openrisc/kernel/process.c index b06f84f6676f..6bcdca424e11 100644 --- a/arch/openrisc/kernel/process.c +++ b/arch/openrisc/kernel/process.c @@ -117,12 +117,12 @@ void release_thread(struct task_struct *dead_task) extern asmlinkage void ret_from_fork(void); /* - * copy_thread + * copy_thread_tls * @clone_flags: flags * @usp: user stack pointer or fn for kernel thread * @arg: arg to fn for kernel thread; always NULL for userspace thread * @p: the newly created task - * @regs: CPU context to copy for userspace thread; always NULL for kthread + * @tls: the Thread Local Storage pointer for the new process * * At the top of a newly initialized kernel stack are two stacked pt_reg * structures. The first (topmost) is the userspace context of the thread. @@ -148,8 +148,8 @@ extern asmlinkage void ret_from_fork(void); */ int -copy_thread(unsigned long clone_flags, unsigned long usp, - unsigned long arg, struct task_struct *p) +copy_thread_tls(unsigned long clone_flags, unsigned long usp, + unsigned long arg, struct task_struct *p, unsigned long tls) { struct pt_regs *userregs; struct pt_regs *kregs; @@ -179,16 +179,10 @@ copy_thread(unsigned long clone_flags, unsigned long usp, userregs->sp = usp; /* - * For CLONE_SETTLS set "tp" (r10) to the TLS pointer passed to sys_clone. - * - * The kernel entry is: - * int clone (long flags, void *child_stack, int *parent_tid, - * int *child_tid, struct void *tls) - * - * This makes the source r7 in the kernel registers. + * For CLONE_SETTLS set "tp" (r10) to the TLS pointer. */ if (clone_flags & CLONE_SETTLS) - userregs->gpr[10] = userregs->gpr[7]; + userregs->gpr[10] = tls; userregs->gpr[11] = 0; /* Result from fork() */ diff --git a/arch/openrisc/kernel/smp.c b/arch/openrisc/kernel/smp.c index 7d518ee8bddc..bd1e660bbc89 100644 --- a/arch/openrisc/kernel/smp.c +++ b/arch/openrisc/kernel/smp.c @@ -14,6 +14,7 @@ #include <linux/smp.h> #include <linux/cpu.h> #include <linux/sched.h> +#include <linux/sched/mm.h> #include <linux/irq.h> #include <asm/cpuinfo.h> #include <asm/mmu_context.h> @@ -113,7 +114,7 @@ asmlinkage __init void secondary_start_kernel(void) * All kernel threads share the same mm context; grab a * reference and switch to it. */ - atomic_inc(&mm->mm_count); + mmgrab(mm); current->active_mm = mm; cpumask_set_cpu(cpu, mm_cpumask(mm)); diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c index 932a8ec2b520..c11aa2e17ce0 100644 --- a/arch/openrisc/kernel/traps.c +++ b/arch/openrisc/kernel/traps.c @@ -55,13 +55,6 @@ void show_stack(struct task_struct *task, unsigned long *esp) unwind_stack(NULL, esp, print_trace); } -void show_trace_task(struct task_struct *tsk) -{ - /* - * TODO: SysRq-T trace dump... - */ -} - void show_registers(struct pt_regs *regs) { int i; |