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![Ian Munsie](/assets/img/avatar_default.png)
cxl devices typically access memory using an MMU in much the same way as the CPU, and each context includes a state register much like the MSR in the CPU. Like the CPU, the state register includes a bit to enable relocation, which we currently always enable. In some cases, it may be desirable to allow a device to access memory using real addresses instead of effective addresses, so this adds a new API, cxl_set_translation_mode, that can be used to disable relocation on a given kernel context. This can allow for the creation of a special privileged context that the device can use if it needs relocation disabled, and can use regular contexts at times when it needs relocation enabled. This interface is only available to users of the kernel API for obvious reasons, and will never be supported in a virtualised environment. This will be used by the upcoming cxl support in the mlx5 driver. Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
396 lines
8.7 KiB
C
396 lines
8.7 KiB
C
/*
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* Copyright 2014 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/anon_inodes.h>
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#include <linux/file.h>
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#include <misc/cxl.h>
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#include <linux/fs.h>
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#include "cxl.h"
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struct cxl_context *cxl_dev_context_init(struct pci_dev *dev)
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{
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struct address_space *mapping;
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struct cxl_afu *afu;
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struct cxl_context *ctx;
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int rc;
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afu = cxl_pci_to_afu(dev);
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ctx = cxl_context_alloc();
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if (IS_ERR(ctx)) {
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rc = PTR_ERR(ctx);
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goto err_dev;
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}
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ctx->kernelapi = true;
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/*
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* Make our own address space since we won't have one from the
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* filesystem like the user api has, and even if we do associate a file
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* with this context we don't want to use the global anonymous inode's
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* address space as that can invalidate unrelated users:
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*/
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mapping = kmalloc(sizeof(struct address_space), GFP_KERNEL);
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if (!mapping) {
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rc = -ENOMEM;
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goto err_ctx;
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}
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address_space_init_once(mapping);
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/* Make it a slave context. We can promote it later? */
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rc = cxl_context_init(ctx, afu, false, mapping);
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if (rc)
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goto err_mapping;
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return ctx;
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err_mapping:
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kfree(mapping);
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err_ctx:
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kfree(ctx);
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err_dev:
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return ERR_PTR(rc);
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}
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EXPORT_SYMBOL_GPL(cxl_dev_context_init);
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struct cxl_context *cxl_get_context(struct pci_dev *dev)
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{
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return dev->dev.archdata.cxl_ctx;
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}
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EXPORT_SYMBOL_GPL(cxl_get_context);
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int cxl_release_context(struct cxl_context *ctx)
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{
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if (ctx->status >= STARTED)
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return -EBUSY;
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cxl_context_free(ctx);
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return 0;
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}
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EXPORT_SYMBOL_GPL(cxl_release_context);
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static irq_hw_number_t cxl_find_afu_irq(struct cxl_context *ctx, int num)
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{
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__u16 range;
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int r;
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for (r = 0; r < CXL_IRQ_RANGES; r++) {
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range = ctx->irqs.range[r];
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if (num < range) {
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return ctx->irqs.offset[r] + num;
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}
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num -= range;
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}
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return 0;
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}
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int cxl_allocate_afu_irqs(struct cxl_context *ctx, int num)
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{
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int res;
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irq_hw_number_t hwirq;
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if (num == 0)
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num = ctx->afu->pp_irqs;
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res = afu_allocate_irqs(ctx, num);
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if (!res && !cpu_has_feature(CPU_FTR_HVMODE)) {
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/* In a guest, the PSL interrupt is not multiplexed. It was
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* allocated above, and we need to set its handler
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*/
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hwirq = cxl_find_afu_irq(ctx, 0);
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if (hwirq)
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cxl_map_irq(ctx->afu->adapter, hwirq, cxl_ops->psl_interrupt, ctx, "psl");
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}
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return res;
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}
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EXPORT_SYMBOL_GPL(cxl_allocate_afu_irqs);
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void cxl_free_afu_irqs(struct cxl_context *ctx)
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{
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irq_hw_number_t hwirq;
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unsigned int virq;
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if (!cpu_has_feature(CPU_FTR_HVMODE)) {
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hwirq = cxl_find_afu_irq(ctx, 0);
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if (hwirq) {
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virq = irq_find_mapping(NULL, hwirq);
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if (virq)
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cxl_unmap_irq(virq, ctx);
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}
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}
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afu_irq_name_free(ctx);
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cxl_ops->release_irq_ranges(&ctx->irqs, ctx->afu->adapter);
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}
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EXPORT_SYMBOL_GPL(cxl_free_afu_irqs);
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int cxl_map_afu_irq(struct cxl_context *ctx, int num,
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irq_handler_t handler, void *cookie, char *name)
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{
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irq_hw_number_t hwirq;
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/*
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* Find interrupt we are to register.
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*/
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hwirq = cxl_find_afu_irq(ctx, num);
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if (!hwirq)
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return -ENOENT;
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return cxl_map_irq(ctx->afu->adapter, hwirq, handler, cookie, name);
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}
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EXPORT_SYMBOL_GPL(cxl_map_afu_irq);
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void cxl_unmap_afu_irq(struct cxl_context *ctx, int num, void *cookie)
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{
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irq_hw_number_t hwirq;
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unsigned int virq;
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hwirq = cxl_find_afu_irq(ctx, num);
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if (!hwirq)
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return;
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virq = irq_find_mapping(NULL, hwirq);
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if (virq)
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cxl_unmap_irq(virq, cookie);
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}
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EXPORT_SYMBOL_GPL(cxl_unmap_afu_irq);
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/*
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* Start a context
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* Code here similar to afu_ioctl_start_work().
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*/
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int cxl_start_context(struct cxl_context *ctx, u64 wed,
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struct task_struct *task)
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{
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int rc = 0;
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bool kernel = true;
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pr_devel("%s: pe: %i\n", __func__, ctx->pe);
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mutex_lock(&ctx->status_mutex);
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if (ctx->status == STARTED)
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goto out; /* already started */
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if (task) {
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ctx->pid = get_task_pid(task, PIDTYPE_PID);
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ctx->glpid = get_task_pid(task->group_leader, PIDTYPE_PID);
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kernel = false;
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ctx->real_mode = false;
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}
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cxl_ctx_get();
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if ((rc = cxl_ops->attach_process(ctx, kernel, wed, 0))) {
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put_pid(ctx->pid);
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cxl_ctx_put();
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goto out;
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}
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ctx->status = STARTED;
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out:
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mutex_unlock(&ctx->status_mutex);
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return rc;
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}
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EXPORT_SYMBOL_GPL(cxl_start_context);
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int cxl_process_element(struct cxl_context *ctx)
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{
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return ctx->external_pe;
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}
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EXPORT_SYMBOL_GPL(cxl_process_element);
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/* Stop a context. Returns 0 on success, otherwise -Errno */
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int cxl_stop_context(struct cxl_context *ctx)
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{
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return __detach_context(ctx);
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}
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EXPORT_SYMBOL_GPL(cxl_stop_context);
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void cxl_set_master(struct cxl_context *ctx)
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{
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ctx->master = true;
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}
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EXPORT_SYMBOL_GPL(cxl_set_master);
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int cxl_set_translation_mode(struct cxl_context *ctx, bool real_mode)
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{
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if (ctx->status == STARTED) {
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/*
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* We could potentially update the PE and issue an update LLCMD
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* to support this, but it doesn't seem to have a good use case
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* since it's trivial to just create a second kernel context
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* with different translation modes, so until someone convinces
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* me otherwise:
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*/
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return -EBUSY;
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}
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ctx->real_mode = real_mode;
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return 0;
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}
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EXPORT_SYMBOL_GPL(cxl_set_translation_mode);
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/* wrappers around afu_* file ops which are EXPORTED */
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int cxl_fd_open(struct inode *inode, struct file *file)
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{
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return afu_open(inode, file);
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}
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EXPORT_SYMBOL_GPL(cxl_fd_open);
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int cxl_fd_release(struct inode *inode, struct file *file)
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{
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return afu_release(inode, file);
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}
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EXPORT_SYMBOL_GPL(cxl_fd_release);
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long cxl_fd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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return afu_ioctl(file, cmd, arg);
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}
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EXPORT_SYMBOL_GPL(cxl_fd_ioctl);
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int cxl_fd_mmap(struct file *file, struct vm_area_struct *vm)
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{
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return afu_mmap(file, vm);
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}
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EXPORT_SYMBOL_GPL(cxl_fd_mmap);
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unsigned int cxl_fd_poll(struct file *file, struct poll_table_struct *poll)
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{
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return afu_poll(file, poll);
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}
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EXPORT_SYMBOL_GPL(cxl_fd_poll);
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ssize_t cxl_fd_read(struct file *file, char __user *buf, size_t count,
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loff_t *off)
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{
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return afu_read(file, buf, count, off);
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}
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EXPORT_SYMBOL_GPL(cxl_fd_read);
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#define PATCH_FOPS(NAME) if (!fops->NAME) fops->NAME = afu_fops.NAME
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/* Get a struct file and fd for a context and attach the ops */
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struct file *cxl_get_fd(struct cxl_context *ctx, struct file_operations *fops,
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int *fd)
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{
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struct file *file;
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int rc, flags, fdtmp;
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flags = O_RDWR | O_CLOEXEC;
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/* This code is similar to anon_inode_getfd() */
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rc = get_unused_fd_flags(flags);
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if (rc < 0)
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return ERR_PTR(rc);
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fdtmp = rc;
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/*
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* Patch the file ops. Needs to be careful that this is rentrant safe.
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*/
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if (fops) {
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PATCH_FOPS(open);
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PATCH_FOPS(poll);
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PATCH_FOPS(read);
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PATCH_FOPS(release);
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PATCH_FOPS(unlocked_ioctl);
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PATCH_FOPS(compat_ioctl);
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PATCH_FOPS(mmap);
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} else /* use default ops */
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fops = (struct file_operations *)&afu_fops;
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file = anon_inode_getfile("cxl", fops, ctx, flags);
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if (IS_ERR(file))
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goto err_fd;
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file->f_mapping = ctx->mapping;
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*fd = fdtmp;
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return file;
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err_fd:
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put_unused_fd(fdtmp);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(cxl_get_fd);
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struct cxl_context *cxl_fops_get_context(struct file *file)
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{
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return file->private_data;
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}
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EXPORT_SYMBOL_GPL(cxl_fops_get_context);
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int cxl_start_work(struct cxl_context *ctx,
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struct cxl_ioctl_start_work *work)
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{
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int rc;
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/* code taken from afu_ioctl_start_work */
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if (!(work->flags & CXL_START_WORK_NUM_IRQS))
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work->num_interrupts = ctx->afu->pp_irqs;
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else if ((work->num_interrupts < ctx->afu->pp_irqs) ||
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(work->num_interrupts > ctx->afu->irqs_max)) {
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return -EINVAL;
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}
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rc = afu_register_irqs(ctx, work->num_interrupts);
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if (rc)
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return rc;
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rc = cxl_start_context(ctx, work->work_element_descriptor, current);
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if (rc < 0) {
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afu_release_irqs(ctx, ctx);
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return rc;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(cxl_start_work);
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void __iomem *cxl_psa_map(struct cxl_context *ctx)
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{
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if (ctx->status != STARTED)
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return NULL;
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pr_devel("%s: psn_phys%llx size:%llx\n",
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__func__, ctx->psn_phys, ctx->psn_size);
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return ioremap(ctx->psn_phys, ctx->psn_size);
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}
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EXPORT_SYMBOL_GPL(cxl_psa_map);
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void cxl_psa_unmap(void __iomem *addr)
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{
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iounmap(addr);
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}
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EXPORT_SYMBOL_GPL(cxl_psa_unmap);
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int cxl_afu_reset(struct cxl_context *ctx)
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{
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struct cxl_afu *afu = ctx->afu;
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int rc;
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rc = cxl_ops->afu_reset(afu);
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if (rc)
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return rc;
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return cxl_ops->afu_check_and_enable(afu);
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}
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EXPORT_SYMBOL_GPL(cxl_afu_reset);
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void cxl_perst_reloads_same_image(struct cxl_afu *afu,
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bool perst_reloads_same_image)
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{
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afu->adapter->perst_same_image = perst_reloads_same_image;
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}
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EXPORT_SYMBOL_GPL(cxl_perst_reloads_same_image);
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ssize_t cxl_read_adapter_vpd(struct pci_dev *dev, void *buf, size_t count)
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{
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struct cxl_afu *afu = cxl_pci_to_afu(dev);
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return cxl_ops->read_adapter_vpd(afu->adapter, buf, count);
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}
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EXPORT_SYMBOL_GPL(cxl_read_adapter_vpd);
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