1 files changed, 142 insertions, 0 deletions

diff --git a/drivers/misc/ocxl/sysfs.c b/drivers/misc/ocxl/sysfs.c
new file mode 100644
index 000000000000..d9753a1db14b
--- /dev/null
+++ b/drivers/misc/ocxl/sysfs.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2017 IBM Corp.
+#include <linux/sysfs.h>
+#include "ocxl_internal.h"
+
+static ssize_t global_mmio_size_show(struct device *device,
+                                struct device_attribute *attr,
+                                char *buf)
+{
+        struct ocxl_afu *afu = to_ocxl_afu(device);
+
+        return scnprintf(buf, PAGE_SIZE, "%d\n",
+                        afu->config.global_mmio_size);
+}
+
+static ssize_t pp_mmio_size_show(struct device *device,
+                                struct device_attribute *attr,
+                                char *buf)
+{
+        struct ocxl_afu *afu = to_ocxl_afu(device);
+
+        return scnprintf(buf, PAGE_SIZE, "%d\n",
+                        afu->config.pp_mmio_stride);
+}
+
+static ssize_t afu_version_show(struct device *device,
+                                struct device_attribute *attr,
+                                char *buf)
+{
+        struct ocxl_afu *afu = to_ocxl_afu(device);
+
+        return scnprintf(buf, PAGE_SIZE, "%hhu:%hhu\n",
+                        afu->config.version_major,
+                        afu->config.version_minor);
+}
+
+static ssize_t contexts_show(struct device *device,
+                struct device_attribute *attr,
+                char *buf)
+{
+        struct ocxl_afu *afu = to_ocxl_afu(device);
+
+        return scnprintf(buf, PAGE_SIZE, "%d/%d\n",
+                        afu->pasid_count, afu->pasid_max);
+}
+
+static struct device_attribute afu_attrs[] = {
+        __ATTR_RO(global_mmio_size),
+        __ATTR_RO(pp_mmio_size),
+        __ATTR_RO(afu_version),
+        __ATTR_RO(contexts),
+};
+
+static ssize_t global_mmio_read(struct file *filp, struct kobject *kobj,
+                                struct bin_attribute *bin_attr, char *buf,
+                                loff_t off, size_t count)
+{
+        struct ocxl_afu *afu = to_ocxl_afu(kobj_to_dev(kobj));
+
+        if (count == 0 || off < 0 ||
+                off >= afu->config.global_mmio_size)
+                return 0;
+        memcpy_fromio(buf, afu->global_mmio_ptr + off, count);
+        return count;
+}
+
+static int global_mmio_fault(struct vm_fault *vmf)
+{
+        struct vm_area_struct *vma = vmf->vma;
+        struct ocxl_afu *afu = vma->vm_private_data;
+        unsigned long offset;
+
+        if (vmf->pgoff >= (afu->config.global_mmio_size >> PAGE_SHIFT))
+                return VM_FAULT_SIGBUS;
+
+        offset = vmf->pgoff;
+        offset += (afu->global_mmio_start >> PAGE_SHIFT);
+        vm_insert_pfn(vma, vmf->address, offset);
+        return VM_FAULT_NOPAGE;
+}
+
+static const struct vm_operations_struct global_mmio_vmops = {
+        .fault = global_mmio_fault,
+};
+
+static int global_mmio_mmap(struct file *filp, struct kobject *kobj,
+                        struct bin_attribute *bin_attr,
+                        struct vm_area_struct *vma)
+{
+        struct ocxl_afu *afu = to_ocxl_afu(kobj_to_dev(kobj));
+
+        if ((vma_pages(vma) + vma->vm_pgoff) >
+                (afu->config.global_mmio_size >> PAGE_SHIFT))
+                return -EINVAL;
+
+        vma->vm_flags |= VM_IO | VM_PFNMAP;
+        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+        vma->vm_ops = &global_mmio_vmops;
+        vma->vm_private_data = afu;
+        return 0;
+}
+
+int ocxl_sysfs_add_afu(struct ocxl_afu *afu)
+{
+        int i, rc;
+
+        for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) {
+                rc = device_create_file(&afu->dev, &afu_attrs[i]);
+                if (rc)
+                        goto err;
+        }
+
+        sysfs_attr_init(&afu->attr_global_mmio.attr);
+        afu->attr_global_mmio.attr.name = "global_mmio_area";
+        afu->attr_global_mmio.attr.mode = 0600;
+        afu->attr_global_mmio.size = afu->config.global_mmio_size;
+        afu->attr_global_mmio.read = global_mmio_read;
+        afu->attr_global_mmio.mmap = global_mmio_mmap;
+        rc = device_create_bin_file(&afu->dev, &afu->attr_global_mmio);
+        if (rc) {
+                dev_err(&afu->dev,
+                        "Unable to create global mmio attr for afu: %d\n",
+                        rc);
+                goto err;
+        }
+
+        return 0;
+
+err:
+        for (i--; i >= 0; i--)
+                device_remove_file(&afu->dev, &afu_attrs[i]);
+        return rc;
+}
+
+void ocxl_sysfs_remove_afu(struct ocxl_afu *afu)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(afu_attrs); i++)
+                device_remove_file(&afu->dev, &afu_attrs[i]);
+        device_remove_bin_file(&afu->dev, &afu->attr_global_mmio);
+}