1 files changed, 0 insertions, 532 deletions
diff --git a/drivers/misc/cxl/api.c b/drivers/misc/cxl/api.c
deleted file mode 100644
index d85c56530863..000000000000
--- a/drivers/misc/cxl/api.c
+++ /dev/null
@@ -1,532 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright 2014 IBM Corp.
- */
-
-#include <linux/pci.h>
-#include <linux/slab.h>
-#include <linux/file.h>
-#include <misc/cxl.h>
-#include <linux/module.h>
-#include <linux/mount.h>
-#include <linux/pseudo_fs.h>
-#include <linux/sched/mm.h>
-#include <linux/mmu_context.h>
-#include <linux/irqdomain.h>
-
-#include "cxl.h"
-
-/*
- * Since we want to track memory mappings to be able to force-unmap
- * when the AFU is no longer reachable, we need an inode. For devices
- * opened through the cxl user API, this is not a problem, but a
- * userland process can also get a cxl fd through the cxl_get_fd()
- * API, which is used by the cxlflash driver.
- *
- * Therefore we implement our own simple pseudo-filesystem and inode
- * allocator. We don't use the anonymous inode, as we need the
- * meta-data associated with it (address_space) and it is shared by
- * other drivers/processes, so it could lead to cxl unmapping VMAs
- * from random processes.
- */
-
-#define CXL_PSEUDO_FS_MAGIC	0x1697697f
-
-static int cxl_fs_cnt;
-static struct vfsmount *cxl_vfs_mount;
-
-static int cxl_fs_init_fs_context(struct fs_context *fc)
-{
-	return init_pseudo(fc, CXL_PSEUDO_FS_MAGIC) ? 0 : -ENOMEM;
-}
-
-static struct file_system_type cxl_fs_type = {
-	.name		= "cxl",
-	.owner		= THIS_MODULE,
-	.init_fs_context = cxl_fs_init_fs_context,
-	.kill_sb	= kill_anon_super,
-};
-
-
-void cxl_release_mapping(struct cxl_context *ctx)
-{
-	if (ctx->kernelapi && ctx->mapping)
-		simple_release_fs(&cxl_vfs_mount, &cxl_fs_cnt);
-}
-
-static struct file *cxl_getfile(const char *name,
-				const struct file_operations *fops,
-				void *priv, int flags)
-{
-	struct file *file;
-	struct inode *inode;
-	int rc;
-
-	/* strongly inspired by anon_inode_getfile() */
-
-	if (fops->owner && !try_module_get(fops->owner))
-		return ERR_PTR(-ENOENT);
-
-	rc = simple_pin_fs(&cxl_fs_type, &cxl_vfs_mount, &cxl_fs_cnt);
-	if (rc < 0) {
-		pr_err("Cannot mount cxl pseudo filesystem: %d\n", rc);
-		file = ERR_PTR(rc);
-		goto err_module;
-	}
-
-	inode = alloc_anon_inode(cxl_vfs_mount->mnt_sb);
-	if (IS_ERR(inode)) {
-		file = ERR_CAST(inode);
-		goto err_fs;
-	}
-
-	file = alloc_file_pseudo(inode, cxl_vfs_mount, name,
-				 flags & (O_ACCMODE | O_NONBLOCK), fops);
-	if (IS_ERR(file))
-		goto err_inode;
-
-	file->private_data = priv;
-
-	return file;
-
-err_inode:
-	iput(inode);
-err_fs:
-	simple_release_fs(&cxl_vfs_mount, &cxl_fs_cnt);
-err_module:
-	module_put(fops->owner);
-	return file;
-}
-
-struct cxl_context *cxl_dev_context_init(struct pci_dev *dev)
-{
-	struct cxl_afu *afu;
-	struct cxl_context  *ctx;
-	int rc;
-
-	afu = cxl_pci_to_afu(dev);
-	if (IS_ERR(afu))
-		return ERR_CAST(afu);
-
-	ctx = cxl_context_alloc();
-	if (!ctx)
-		return ERR_PTR(-ENOMEM);
-
-	ctx->kernelapi = true;
-
-	/* Make it a slave context.  We can promote it later? */
-	rc = cxl_context_init(ctx, afu, false);
-	if (rc)
-		goto err_ctx;
-
-	return ctx;
-
-err_ctx:
-	kfree(ctx);
-	return ERR_PTR(rc);
-}
-EXPORT_SYMBOL_GPL(cxl_dev_context_init);
-
-struct cxl_context *cxl_get_context(struct pci_dev *dev)
-{
-	return dev->dev.archdata.cxl_ctx;
-}
-EXPORT_SYMBOL_GPL(cxl_get_context);
-
-int cxl_release_context(struct cxl_context *ctx)
-{
-	if (ctx->status >= STARTED)
-		return -EBUSY;
-
-	cxl_context_free(ctx);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(cxl_release_context);
-
-static irq_hw_number_t cxl_find_afu_irq(struct cxl_context *ctx, int num)
-{
-	__u16 range;
-	int r;
-
-	for (r = 0; r < CXL_IRQ_RANGES; r++) {
-		range = ctx->irqs.range[r];
-		if (num < range) {
-			return ctx->irqs.offset[r] + num;
-		}
-		num -= range;
-	}
-	return 0;
-}
-
-
-int cxl_set_priv(struct cxl_context *ctx, void *priv)
-{
-	if (!ctx)
-		return -EINVAL;
-
-	ctx->priv = priv;
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(cxl_set_priv);
-
-void *cxl_get_priv(struct cxl_context *ctx)
-{
-	if (!ctx)
-		return ERR_PTR(-EINVAL);
-
-	return ctx->priv;
-}
-EXPORT_SYMBOL_GPL(cxl_get_priv);
-
-int cxl_allocate_afu_irqs(struct cxl_context *ctx, int num)
-{
-	int res;
-	irq_hw_number_t hwirq;
-
-	if (num == 0)
-		num = ctx->afu->pp_irqs;
-	res = afu_allocate_irqs(ctx, num);
-	if (res)
-		return res;
-
-	if (!cpu_has_feature(CPU_FTR_HVMODE)) {
-		/* In a guest, the PSL interrupt is not multiplexed. It was
-		 * allocated above, and we need to set its handler
-		 */
-		hwirq = cxl_find_afu_irq(ctx, 0);
-		if (hwirq)
-			cxl_map_irq(ctx->afu->adapter, hwirq, cxl_ops->psl_interrupt, ctx, "psl");
-	}
-
-	if (ctx->status == STARTED) {
-		if (cxl_ops->update_ivtes)
-			cxl_ops->update_ivtes(ctx);
-		else WARN(1, "BUG: cxl_allocate_afu_irqs must be called prior to starting the context on this platform\n");
-	}
-
-	return res;
-}
-EXPORT_SYMBOL_GPL(cxl_allocate_afu_irqs);
-
-void cxl_free_afu_irqs(struct cxl_context *ctx)
-{
-	irq_hw_number_t hwirq;
-	unsigned int virq;
-
-	if (!cpu_has_feature(CPU_FTR_HVMODE)) {
-		hwirq = cxl_find_afu_irq(ctx, 0);
-		if (hwirq) {
-			virq = irq_find_mapping(NULL, hwirq);
-			if (virq)
-				cxl_unmap_irq(virq, ctx);
-		}
-	}
-	afu_irq_name_free(ctx);
-	cxl_ops->release_irq_ranges(&ctx->irqs, ctx->afu->adapter);
-}
-EXPORT_SYMBOL_GPL(cxl_free_afu_irqs);
-
-int cxl_map_afu_irq(struct cxl_context *ctx, int num,
-		    irq_handler_t handler, void *cookie, char *name)
-{
-	irq_hw_number_t hwirq;
-
-	/*
-	 * Find interrupt we are to register.
-	 */
-	hwirq = cxl_find_afu_irq(ctx, num);
-	if (!hwirq)
-		return -ENOENT;
-
-	return cxl_map_irq(ctx->afu->adapter, hwirq, handler, cookie, name);
-}
-EXPORT_SYMBOL_GPL(cxl_map_afu_irq);
-
-void cxl_unmap_afu_irq(struct cxl_context *ctx, int num, void *cookie)
-{
-	irq_hw_number_t hwirq;
-	unsigned int virq;
-
-	hwirq = cxl_find_afu_irq(ctx, num);
-	if (!hwirq)
-		return;
-
-	virq = irq_find_mapping(NULL, hwirq);
-	if (virq)
-		cxl_unmap_irq(virq, cookie);
-}
-EXPORT_SYMBOL_GPL(cxl_unmap_afu_irq);
-
-/*
- * Start a context
- * Code here similar to afu_ioctl_start_work().
- */
-int cxl_start_context(struct cxl_context *ctx, u64 wed,
-		      struct task_struct *task)
-{
-	int rc = 0;
-	bool kernel = true;
-
-	pr_devel("%s: pe: %i\n", __func__, ctx->pe);
-
-	mutex_lock(&ctx->status_mutex);
-	if (ctx->status == STARTED)
-		goto out; /* already started */
-
-	/*
-	 * Increment the mapped context count for adapter. This also checks
-	 * if adapter_context_lock is taken.
-	 */
-	rc = cxl_adapter_context_get(ctx->afu->adapter);
-	if (rc)
-		goto out;
-
-	if (task) {
-		ctx->pid = get_task_pid(task, PIDTYPE_PID);
-		kernel = false;
-
-		/* acquire a reference to the task's mm */
-		ctx->mm = get_task_mm(current);
-
-		/* ensure this mm_struct can't be freed */
-		cxl_context_mm_count_get(ctx);
-
-		if (ctx->mm) {
-			/* decrement the use count from above */
-			mmput(ctx->mm);
-			/* make TLBIs for this context global */
-			mm_context_add_copro(ctx->mm);
-		}
-	}
-
-	/*
-	 * Increment driver use count. Enables global TLBIs for hash
-	 * and callbacks to handle the segment table
-	 */
-	cxl_ctx_get();
-
-	/* See the comment in afu_ioctl_start_work() */
-	smp_mb();
-
-	if ((rc = cxl_ops->attach_process(ctx, kernel, wed, 0))) {
-		put_pid(ctx->pid);
-		ctx->pid = NULL;
-		cxl_adapter_context_put(ctx->afu->adapter);
-		cxl_ctx_put();
-		if (task) {
-			cxl_context_mm_count_put(ctx);
-			if (ctx->mm)
-				mm_context_remove_copro(ctx->mm);
-		}
-		goto out;
-	}
-
-	ctx->status = STARTED;
-out:
-	mutex_unlock(&ctx->status_mutex);
-	return rc;
-}
-EXPORT_SYMBOL_GPL(cxl_start_context);
-
-int cxl_process_element(struct cxl_context *ctx)
-{
-	return ctx->external_pe;
-}
-EXPORT_SYMBOL_GPL(cxl_process_element);
-
-/* Stop a context.  Returns 0 on success, otherwise -Errno */
-int cxl_stop_context(struct cxl_context *ctx)
-{
-	return __detach_context(ctx);
-}
-EXPORT_SYMBOL_GPL(cxl_stop_context);
-
-void cxl_set_master(struct cxl_context *ctx)
-{
-	ctx->master = true;
-}
-EXPORT_SYMBOL_GPL(cxl_set_master);
-
-/* wrappers around afu_* file ops which are EXPORTED */
-int cxl_fd_open(struct inode *inode, struct file *file)
-{
-	return afu_open(inode, file);
-}
-EXPORT_SYMBOL_GPL(cxl_fd_open);
-int cxl_fd_release(struct inode *inode, struct file *file)
-{
-	return afu_release(inode, file);
-}
-EXPORT_SYMBOL_GPL(cxl_fd_release);
-long cxl_fd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
-	return afu_ioctl(file, cmd, arg);
-}
-EXPORT_SYMBOL_GPL(cxl_fd_ioctl);
-int cxl_fd_mmap(struct file *file, struct vm_area_struct *vm)
-{
-	return afu_mmap(file, vm);
-}
-EXPORT_SYMBOL_GPL(cxl_fd_mmap);
-__poll_t cxl_fd_poll(struct file *file, struct poll_table_struct *poll)
-{
-	return afu_poll(file, poll);
-}
-EXPORT_SYMBOL_GPL(cxl_fd_poll);
-ssize_t cxl_fd_read(struct file *file, char __user *buf, size_t count,
-			loff_t *off)
-{
-	return afu_read(file, buf, count, off);
-}
-EXPORT_SYMBOL_GPL(cxl_fd_read);
-
-#define PATCH_FOPS(NAME) if (!fops->NAME) fops->NAME = afu_fops.NAME
-
-/* 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);