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path: root/drivers/scsi/cxlflash/cxl_hw.c
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-rw-r--r--drivers/scsi/cxlflash/cxl_hw.c177
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/scsi/cxlflash/cxl_hw.c b/drivers/scsi/cxlflash/cxl_hw.c
new file mode 100644
index 0000000000..b814130f3f
--- /dev/null
+++ b/drivers/scsi/cxlflash/cxl_hw.c
@@ -0,0 +1,177 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * CXL Flash Device Driver
+ *
+ * Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
+ * Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation
+ *
+ * Copyright (C) 2018 IBM Corporation
+ */
+
+#include <misc/cxl.h>
+
+#include "backend.h"
+
+/*
+ * The following routines map the cxlflash backend operations to existing CXL
+ * kernel API function and are largely simple shims that provide an abstraction
+ * for converting generic context and AFU cookies into cxl_context or cxl_afu
+ * pointers.
+ */
+
+static void __iomem *cxlflash_psa_map(void *ctx_cookie)
+{
+ return cxl_psa_map(ctx_cookie);
+}
+
+static void cxlflash_psa_unmap(void __iomem *addr)
+{
+ cxl_psa_unmap(addr);
+}
+
+static int cxlflash_process_element(void *ctx_cookie)
+{
+ return cxl_process_element(ctx_cookie);
+}
+
+static int cxlflash_map_afu_irq(void *ctx_cookie, int num,
+ irq_handler_t handler, void *cookie, char *name)
+{
+ return cxl_map_afu_irq(ctx_cookie, num, handler, cookie, name);
+}
+
+static void cxlflash_unmap_afu_irq(void *ctx_cookie, int num, void *cookie)
+{
+ cxl_unmap_afu_irq(ctx_cookie, num, cookie);
+}
+
+static u64 cxlflash_get_irq_objhndl(void *ctx_cookie, int irq)
+{
+ /* Dummy fop for cxl */
+ return 0;
+}
+
+static int cxlflash_start_context(void *ctx_cookie)
+{
+ return cxl_start_context(ctx_cookie, 0, NULL);
+}
+
+static int cxlflash_stop_context(void *ctx_cookie)
+{
+ return cxl_stop_context(ctx_cookie);
+}
+
+static int cxlflash_afu_reset(void *ctx_cookie)
+{
+ return cxl_afu_reset(ctx_cookie);
+}
+
+static void cxlflash_set_master(void *ctx_cookie)
+{
+ cxl_set_master(ctx_cookie);
+}
+
+static void *cxlflash_get_context(struct pci_dev *dev, void *afu_cookie)
+{
+ return cxl_get_context(dev);
+}
+
+static void *cxlflash_dev_context_init(struct pci_dev *dev, void *afu_cookie)
+{
+ return cxl_dev_context_init(dev);
+}
+
+static int cxlflash_release_context(void *ctx_cookie)
+{
+ return cxl_release_context(ctx_cookie);
+}
+
+static void cxlflash_perst_reloads_same_image(void *afu_cookie, bool image)
+{
+ cxl_perst_reloads_same_image(afu_cookie, image);
+}
+
+static ssize_t cxlflash_read_adapter_vpd(struct pci_dev *dev,
+ void *buf, size_t count)
+{
+ return cxl_read_adapter_vpd(dev, buf, count);
+}
+
+static int cxlflash_allocate_afu_irqs(void *ctx_cookie, int num)
+{
+ return cxl_allocate_afu_irqs(ctx_cookie, num);
+}
+
+static void cxlflash_free_afu_irqs(void *ctx_cookie)
+{
+ cxl_free_afu_irqs(ctx_cookie);
+}
+
+static void *cxlflash_create_afu(struct pci_dev *dev)
+{
+ return cxl_pci_to_afu(dev);
+}
+
+static void cxlflash_destroy_afu(void *afu)
+{
+ /* Dummy fop for cxl */
+}
+
+static struct file *cxlflash_get_fd(void *ctx_cookie,
+ struct file_operations *fops, int *fd)
+{
+ return cxl_get_fd(ctx_cookie, fops, fd);
+}
+
+static void *cxlflash_fops_get_context(struct file *file)
+{
+ return cxl_fops_get_context(file);
+}
+
+static int cxlflash_start_work(void *ctx_cookie, u64 irqs)
+{
+ struct cxl_ioctl_start_work work = { 0 };
+
+ work.num_interrupts = irqs;
+ work.flags = CXL_START_WORK_NUM_IRQS;
+
+ return cxl_start_work(ctx_cookie, &work);
+}
+
+static int cxlflash_fd_mmap(struct file *file, struct vm_area_struct *vm)
+{
+ return cxl_fd_mmap(file, vm);
+}
+
+static int cxlflash_fd_release(struct inode *inode, struct file *file)
+{
+ return cxl_fd_release(inode, file);
+}
+
+const struct cxlflash_backend_ops cxlflash_cxl_ops = {
+ .module = THIS_MODULE,
+ .psa_map = cxlflash_psa_map,
+ .psa_unmap = cxlflash_psa_unmap,
+ .process_element = cxlflash_process_element,
+ .map_afu_irq = cxlflash_map_afu_irq,
+ .unmap_afu_irq = cxlflash_unmap_afu_irq,
+ .get_irq_objhndl = cxlflash_get_irq_objhndl,
+ .start_context = cxlflash_start_context,
+ .stop_context = cxlflash_stop_context,
+ .afu_reset = cxlflash_afu_reset,
+ .set_master = cxlflash_set_master,
+ .get_context = cxlflash_get_context,
+ .dev_context_init = cxlflash_dev_context_init,
+ .release_context = cxlflash_release_context,
+ .perst_reloads_same_image = cxlflash_perst_reloads_same_image,
+ .read_adapter_vpd = cxlflash_read_adapter_vpd,
+ .allocate_afu_irqs = cxlflash_allocate_afu_irqs,
+ .free_afu_irqs = cxlflash_free_afu_irqs,
+ .create_afu = cxlflash_create_afu,
+ .destroy_afu = cxlflash_destroy_afu,
+ .get_fd = cxlflash_get_fd,
+ .fops_get_context = cxlflash_fops_get_context,
+ .start_work = cxlflash_start_work,
+ .fd_mmap = cxlflash_fd_mmap,
+ .fd_release = cxlflash_fd_release,
+};