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-rw-r--r--drivers/misc/cxl/api.c331
1 files changed, 331 insertions, 0 deletions
diff --git a/drivers/misc/cxl/api.c b/drivers/misc/cxl/api.c
new file mode 100644
index 000000000000..0c77240ae2fc
--- /dev/null
+++ b/drivers/misc/cxl/api.c
@@ -0,0 +1,331 @@
+/*
+ * Copyright 2014 IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/anon_inodes.h>
+#include <linux/file.h>
+#include <misc/cxl.h>
+
+#include "cxl.h"
+
+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);
+
+ ctx = cxl_context_alloc();
+ if (IS_ERR(ctx))
+ return ctx;
+
+ /* Make it a slave context. We can promote it later? */
+ rc = cxl_context_init(ctx, afu, false, NULL);
+ if (rc) {
+ kfree(ctx);
+ return ERR_PTR(-ENOMEM);
+ }
+ cxl_assign_psn_space(ctx);
+
+ return ctx;
+}
+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);
+
+struct device *cxl_get_phys_dev(struct pci_dev *dev)
+{
+ struct cxl_afu *afu;
+
+ afu = cxl_pci_to_afu(dev);
+
+ return afu->adapter->dev.parent;
+}
+EXPORT_SYMBOL_GPL(cxl_get_phys_dev);
+
+int cxl_release_context(struct cxl_context *ctx)
+{
+ if (ctx->status != CLOSED)
+ return -EBUSY;
+
+ cxl_context_free(ctx);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cxl_release_context);
+
+int cxl_allocate_afu_irqs(struct cxl_context *ctx, int num)
+{
+ if (num == 0)
+ num = ctx->afu->pp_irqs;
+ return afu_allocate_irqs(ctx, num);
+}
+EXPORT_SYMBOL_GPL(cxl_allocate_afu_irqs);
+
+void cxl_free_afu_irqs(struct cxl_context *ctx)
+{
+ cxl_release_irq_ranges(&ctx->irqs, ctx->afu->adapter);
+}
+EXPORT_SYMBOL_GPL(cxl_free_afu_irqs);
+
+static irq_hw_number_t cxl_find_afu_irq(struct cxl_context *ctx, int num)
+{
+ __u16 range;
+ int r;
+
+ WARN_ON(num == 0);
+
+ 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_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 */
+
+ if (task) {
+ ctx->pid = get_task_pid(task, PIDTYPE_PID);
+ get_pid(ctx->pid);
+ kernel = false;
+ }
+
+ cxl_ctx_get();
+
+ if ((rc = cxl_attach_process(ctx, kernel, wed , 0))) {
+ put_pid(ctx->pid);
+ cxl_ctx_put();
+ goto out;
+ }
+
+ ctx->status = STARTED;
+ get_device(&ctx->afu->dev);
+out:
+ mutex_unlock(&ctx->status_mutex);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(cxl_start_context);
+
+int cxl_process_element(struct cxl_context *ctx)
+{
+ return ctx->pe;
+}
+EXPORT_SYMBOL_GPL(cxl_process_element);
+
+/* Stop a context. Returns 0 on success, otherwise -Errno */
+int cxl_stop_context(struct cxl_context *ctx)
+{
+ int rc;
+
+ rc = __detach_context(ctx);
+ if (!rc)
+ put_device(&ctx->afu->dev);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(cxl_stop_context);
+
+void cxl_set_master(struct cxl_context *ctx)
+{
+ ctx->master = true;
+ cxl_assign_psn_space(ctx);
+}
+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);
+unsigned int 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;
+
+ 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;
+
+ file = anon_inode_getfile("cxl", fops, ctx, flags);
+ if (IS_ERR(file))
+ put_unused_fd(fdtmp);
+ *fd = fdtmp;
+ return file;
+}
+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);
+
+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)
+{
+ struct cxl_afu *afu = ctx->afu;
+ int rc;
+
+ rc = cxl_afu_check_and_enable(afu);
+ if (rc)
+ return NULL;
+
+ pr_devel("%s: psn_phys%llx size:%llx\n",
+ __func__, afu->psn_phys, afu->adapter->ps_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_afu_reset(afu);
+ if (rc)
+ return rc;
+
+ return cxl_afu_check_and_enable(afu);
+}
+EXPORT_SYMBOL_GPL(cxl_afu_reset);

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