533 lines
12 KiB
C
533 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2014 IBM Corp.
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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/file.h>
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#include <misc/cxl.h>
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#include <linux/module.h>
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#include <linux/mount.h>
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#include <linux/pseudo_fs.h>
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#include <linux/sched/mm.h>
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#include <linux/mmu_context.h>
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#include <linux/irqdomain.h>
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#include "cxl.h"
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/*
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* Since we want to track memory mappings to be able to force-unmap
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* when the AFU is no longer reachable, we need an inode. For devices
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* opened through the cxl user API, this is not a problem, but a
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* userland process can also get a cxl fd through the cxl_get_fd()
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* API, which is used by the cxlflash driver.
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*
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* Therefore we implement our own simple pseudo-filesystem and inode
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* allocator. We don't use the anonymous inode, as we need the
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* meta-data associated with it (address_space) and it is shared by
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* other drivers/processes, so it could lead to cxl unmapping VMAs
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* from random processes.
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*/
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#define CXL_PSEUDO_FS_MAGIC 0x1697697f
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static int cxl_fs_cnt;
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static struct vfsmount *cxl_vfs_mount;
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static int cxl_fs_init_fs_context(struct fs_context *fc)
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{
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return init_pseudo(fc, CXL_PSEUDO_FS_MAGIC) ? 0 : -ENOMEM;
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}
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static struct file_system_type cxl_fs_type = {
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.name = "cxl",
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.owner = THIS_MODULE,
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.init_fs_context = cxl_fs_init_fs_context,
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.kill_sb = kill_anon_super,
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};
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void cxl_release_mapping(struct cxl_context *ctx)
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{
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if (ctx->kernelapi && ctx->mapping)
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simple_release_fs(&cxl_vfs_mount, &cxl_fs_cnt);
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}
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static struct file *cxl_getfile(const char *name,
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const struct file_operations *fops,
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void *priv, int flags)
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{
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struct file *file;
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struct inode *inode;
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int rc;
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/* strongly inspired by anon_inode_getfile() */
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if (fops->owner && !try_module_get(fops->owner))
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return ERR_PTR(-ENOENT);
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rc = simple_pin_fs(&cxl_fs_type, &cxl_vfs_mount, &cxl_fs_cnt);
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if (rc < 0) {
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pr_err("Cannot mount cxl pseudo filesystem: %d\n", rc);
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file = ERR_PTR(rc);
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goto err_module;
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}
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inode = alloc_anon_inode(cxl_vfs_mount->mnt_sb);
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if (IS_ERR(inode)) {
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file = ERR_CAST(inode);
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goto err_fs;
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}
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file = alloc_file_pseudo(inode, cxl_vfs_mount, name,
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flags & (O_ACCMODE | O_NONBLOCK), fops);
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if (IS_ERR(file))
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goto err_inode;
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file->private_data = priv;
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return file;
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err_inode:
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iput(inode);
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err_fs:
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simple_release_fs(&cxl_vfs_mount, &cxl_fs_cnt);
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err_module:
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module_put(fops->owner);
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return file;
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}
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struct cxl_context *cxl_dev_context_init(struct pci_dev *dev)
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{
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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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if (IS_ERR(afu))
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return ERR_CAST(afu);
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ctx = cxl_context_alloc();
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if (!ctx)
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return ERR_PTR(-ENOMEM);
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ctx->kernelapi = true;
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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);
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if (rc)
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goto err_ctx;
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return ctx;
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err_ctx:
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kfree(ctx);
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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_set_priv(struct cxl_context *ctx, void *priv)
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{
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if (!ctx)
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return -EINVAL;
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ctx->priv = priv;
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return 0;
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}
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EXPORT_SYMBOL_GPL(cxl_set_priv);
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void *cxl_get_priv(struct cxl_context *ctx)
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{
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if (!ctx)
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return ERR_PTR(-EINVAL);
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return ctx->priv;
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}
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EXPORT_SYMBOL_GPL(cxl_get_priv);
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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)
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return res;
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if (!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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if (ctx->status == STARTED) {
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if (cxl_ops->update_ivtes)
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cxl_ops->update_ivtes(ctx);
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else WARN(1, "BUG: cxl_allocate_afu_irqs must be called prior to starting the context on this platform\n");
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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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/*
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* Increment the mapped context count for adapter. This also checks
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* if adapter_context_lock is taken.
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*/
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rc = cxl_adapter_context_get(ctx->afu->adapter);
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if (rc)
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goto out;
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if (task) {
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ctx->pid = get_task_pid(task, PIDTYPE_PID);
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kernel = false;
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/* acquire a reference to the task's mm */
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ctx->mm = get_task_mm(current);
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/* ensure this mm_struct can't be freed */
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cxl_context_mm_count_get(ctx);
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if (ctx->mm) {
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/* decrement the use count from above */
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mmput(ctx->mm);
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/* make TLBIs for this context global */
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mm_context_add_copro(ctx->mm);
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}
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}
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/*
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* Increment driver use count. Enables global TLBIs for hash
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* and callbacks to handle the segment table
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*/
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cxl_ctx_get();
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/* See the comment in afu_ioctl_start_work() */
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smp_mb();
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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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ctx->pid = NULL;
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cxl_adapter_context_put(ctx->afu->adapter);
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cxl_ctx_put();
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if (task) {
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cxl_context_mm_count_put(ctx);
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if (ctx->mm)
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mm_context_remove_copro(ctx->mm);
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}
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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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/* 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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__poll_t 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 */
|
||
|
|
struct file *cxl_get_fd(struct cxl_context *ctx, struct file_operations *fops,
|
||
|
|
int *fd)
|
||
|
|
{
|
||
|
|
struct file *file;
|
||
|
|
int rc, flags, fdtmp;
|
||
|
|
char *name = NULL;
|
||
|
|
|
||
|
|
/* only allow one per context */
|
||
|
|
if (ctx->mapping)
|
||
|
|
return ERR_PTR(-EEXIST);
|
||
|
|
|
||
|
|
flags = O_RDWR | O_CLOEXEC;
|
||
|
|
|
||
|
|
/* This code is similar to anon_inode_getfd() */
|
||
|
|
rc = get_unused_fd_flags(flags);
|
||
|
|
if (rc < 0)
|
||
|
|
return ERR_PTR(rc);
|
||
|
|
fdtmp = rc;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Patch the file ops. Needs to be careful that this is rentrant safe.
|
||
|
|
*/
|
||
|
|
if (fops) {
|
||
|
|
PATCH_FOPS(open);
|
||
|
|
PATCH_FOPS(poll);
|
||
|
|
PATCH_FOPS(read);
|
||
|
|
PATCH_FOPS(release);
|
||
|
|
PATCH_FOPS(unlocked_ioctl);
|
||
|
|
PATCH_FOPS(compat_ioctl);
|
||
|
|
PATCH_FOPS(mmap);
|
||
|
|
} else /* use default ops */
|
||
|
|
fops = (struct file_operations *)&afu_fops;
|
||
|
|
|
||
|
|
name = kasprintf(GFP_KERNEL, "cxl:%d", ctx->pe);
|
||
|
|
file = cxl_getfile(name, fops, ctx, flags);
|
||
|
|
kfree(name);
|
||
|
|
if (IS_ERR(file))
|
||
|
|
goto err_fd;
|
||
|
|
|
||
|
|
cxl_context_set_mapping(ctx, file->f_mapping);
|
||
|
|
*fd = fdtmp;
|
||
|
|
return file;
|
||
|
|
|
||
|
|
err_fd:
|
||
|
|
put_unused_fd(fdtmp);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(cxl_get_fd);
|
||
|
|
|
||
|
|
struct cxl_context *cxl_fops_get_context(struct file *file)
|
||
|
|
{
|
||
|
|
return file->private_data;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(cxl_fops_get_context);
|
||
|
|
|
||
|
|
void cxl_set_driver_ops(struct cxl_context *ctx,
|
||
|
|
struct cxl_afu_driver_ops *ops)
|
||
|
|
{
|
||
|
|
WARN_ON(!ops->fetch_event || !ops->event_delivered);
|
||
|
|
atomic_set(&ctx->afu_driver_events, 0);
|
||
|
|
ctx->afu_driver_ops = ops;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(cxl_set_driver_ops);
|
||
|
|
|
||
|
|
void cxl_context_events_pending(struct cxl_context *ctx,
|
||
|
|
unsigned int new_events)
|
||
|
|
{
|
||
|
|
atomic_add(new_events, &ctx->afu_driver_events);
|
||
|
|
wake_up_all(&ctx->wq);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(cxl_context_events_pending);
|
||
|
|
|
||
|
|
int cxl_start_work(struct cxl_context *ctx,
|
||
|
|
struct cxl_ioctl_start_work *work)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
/* code taken from afu_ioctl_start_work */
|
||
|
|
if (!(work->flags & CXL_START_WORK_NUM_IRQS))
|
||
|
|
work->num_interrupts = ctx->afu->pp_irqs;
|
||
|
|
else if ((work->num_interrupts < ctx->afu->pp_irqs) ||
|
||
|
|
(work->num_interrupts > ctx->afu->irqs_max)) {
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
rc = afu_register_irqs(ctx, work->num_interrupts);
|
||
|
|
if (rc)
|
||
|
|
return rc;
|
||
|
|
|
||
|
|
rc = cxl_start_context(ctx, work->work_element_descriptor, current);
|
||
|
|
if (rc < 0) {
|
||
|
|
afu_release_irqs(ctx, ctx);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(cxl_start_work);
|
||
|
|
|
||
|
|
void __iomem *cxl_psa_map(struct cxl_context *ctx)
|
||
|
|
{
|
||
|
|
if (ctx->status != STARTED)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
pr_devel("%s: psn_phys%llx size:%llx\n",
|
||
|
|
__func__, ctx->psn_phys, ctx->psn_size);
|
||
|
|
return ioremap(ctx->psn_phys, ctx->psn_size);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(cxl_psa_map);
|
||
|
|
|
||
|
|
void cxl_psa_unmap(void __iomem *addr)
|
||
|
|
{
|
||
|
|
iounmap(addr);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(cxl_psa_unmap);
|
||
|
|
|
||
|
|
int cxl_afu_reset(struct cxl_context *ctx)
|
||
|
|
{
|
||
|
|
struct cxl_afu *afu = ctx->afu;
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
rc = cxl_ops->afu_reset(afu);
|
||
|
|
if (rc)
|
||
|
|
return rc;
|
||
|
|
|
||
|
|
return cxl_ops->afu_check_and_enable(afu);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(cxl_afu_reset);
|
||
|
|
|
||
|
|
void cxl_perst_reloads_same_image(struct cxl_afu *afu,
|
||
|
|
bool perst_reloads_same_image)
|
||
|
|
{
|
||
|
|
afu->adapter->perst_same_image = perst_reloads_same_image;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(cxl_perst_reloads_same_image);
|
||
|
|
|
||
|
|
ssize_t cxl_read_adapter_vpd(struct pci_dev *dev, void *buf, size_t count)
|
||
|
|
{
|
||
|
|
struct cxl_afu *afu = cxl_pci_to_afu(dev);
|
||
|
|
if (IS_ERR(afu))
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
return cxl_ops->read_adapter_vpd(afu->adapter, buf, count);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(cxl_read_adapter_vpd);
|