[PATCH v4 1/7] ocxl: Split pci.c

[Alastair D'Silva]

From: Alastair D'Silva <alastair@xxxxxxxxxxx>

In preparation for making core code available for external drivers,
move the core code out of pci.c and into core.c

Signed-off-by: Alastair D'Silva <alastair@xxxxxxxxxxx>
---
 drivers/misc/ocxl/Makefile        |   1 +
 drivers/misc/ocxl/core.c          | 517 +++++++++++++++++++++++++++++
 drivers/misc/ocxl/ocxl_internal.h |   5 +
 drivers/misc/ocxl/pci.c           | 519 +-----------------------------
 4 files changed, 524 insertions(+), 518 deletions(-)
 create mode 100644 drivers/misc/ocxl/core.c

diff --git a/drivers/misc/ocxl/Makefile b/drivers/misc/ocxl/Makefile
index 5229dcda8297..bc4e39bfda7b 100644
--- a/drivers/misc/ocxl/Makefile
+++ b/drivers/misc/ocxl/Makefile
@@ -3,6 +3,7 @@ ccflags-$(CONFIG_PPC_WERROR)	+= -Werror
 
 ocxl-y				+= main.o pci.o config.o file.o pasid.o
 ocxl-y				+= link.o context.o afu_irq.o sysfs.o trace.o
+ocxl-y				+= core.o
 obj-$(CONFIG_OCXL)		+= ocxl.o
 
 # For tracepoints to include our trace.h from tracepoint infrastructure:
diff --git a/drivers/misc/ocxl/core.c b/drivers/misc/ocxl/core.c
new file mode 100644
index 000000000000..1a4411b72d35
--- /dev/null
+++ b/drivers/misc/ocxl/core.c
@@ -0,0 +1,517 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2019 IBM Corp.
+#include <linux/idr.h>
+#include "ocxl_internal.h"
+
+static struct ocxl_fn *ocxl_fn_get(struct ocxl_fn *fn)
+{
+	return (get_device(&fn->dev) == NULL) ? NULL : fn;
+}
+
+static void ocxl_fn_put(struct ocxl_fn *fn)
+{
+	put_device(&fn->dev);
+}
+
+struct ocxl_afu *ocxl_afu_get(struct ocxl_afu *afu)
+{
+	return (get_device(&afu->dev) == NULL) ? NULL : afu;
+}
+
+void ocxl_afu_put(struct ocxl_afu *afu)
+{
+	put_device(&afu->dev);
+}
+
+static struct ocxl_afu *alloc_afu(struct ocxl_fn *fn)
+{
+	struct ocxl_afu *afu;
+
+	afu = kzalloc(sizeof(struct ocxl_afu), GFP_KERNEL);
+	if (!afu)
+		return NULL;
+
+	mutex_init(&afu->contexts_lock);
+	mutex_init(&afu->afu_control_lock);
+	idr_init(&afu->contexts_idr);
+	afu->fn = fn;
+	ocxl_fn_get(fn);
+	return afu;
+}
+
+static void free_afu(struct ocxl_afu *afu)
+{
+	idr_destroy(&afu->contexts_idr);
+	ocxl_fn_put(afu->fn);
+	kfree(afu);
+}
+
+static void free_afu_dev(struct device *dev)
+{
+	struct ocxl_afu *afu = to_ocxl_afu(dev);
+
+	ocxl_unregister_afu(afu);
+	free_afu(afu);
+}
+
+static int set_afu_device(struct ocxl_afu *afu, const char *location)
+{
+	struct ocxl_fn *fn = afu->fn;
+	int rc;
+
+	afu->dev.parent = &fn->dev;
+	afu->dev.release = free_afu_dev;
+	rc = dev_set_name(&afu->dev, "%s.%s.%hhu", afu->config.name, location,
+		afu->config.idx);
+	return rc;
+}
+
+static int assign_afu_actag(struct ocxl_afu *afu, struct pci_dev *dev)
+{
+	struct ocxl_fn *fn = afu->fn;
+	int actag_count, actag_offset;
+
+	/*
+	 * if there were not enough actags for the function, each afu
+	 * reduces its count as well
+	 */
+	actag_count = afu->config.actag_supported *
+		fn->actag_enabled / fn->actag_supported;
+	actag_offset = ocxl_actag_afu_alloc(fn, actag_count);
+	if (actag_offset < 0) {
+		dev_err(&afu->dev, "Can't allocate %d actags for AFU: %d\n",
+			actag_count, actag_offset);
+		return actag_offset;
+	}
+	afu->actag_base = fn->actag_base + actag_offset;
+	afu->actag_enabled = actag_count;
+
+	ocxl_config_set_afu_actag(dev, afu->config.dvsec_afu_control_pos,
+				afu->actag_base, afu->actag_enabled);
+	dev_dbg(&afu->dev, "actag base=%d enabled=%d\n",
+		afu->actag_base, afu->actag_enabled);
+	return 0;
+}
+
+static void reclaim_afu_actag(struct ocxl_afu *afu)
+{
+	struct ocxl_fn *fn = afu->fn;
+	int start_offset, size;
+
+	start_offset = afu->actag_base - fn->actag_base;
+	size = afu->actag_enabled;
+	ocxl_actag_afu_free(afu->fn, start_offset, size);
+}
+
+static int assign_afu_pasid(struct ocxl_afu *afu, struct pci_dev *dev)
+{
+	struct ocxl_fn *fn = afu->fn;
+	int pasid_count, pasid_offset;
+
+	/*
+	 * We only support the case where the function configuration
+	 * requested enough PASIDs to cover all AFUs.
+	 */
+	pasid_count = 1 << afu->config.pasid_supported_log;
+	pasid_offset = ocxl_pasid_afu_alloc(fn, pasid_count);
+	if (pasid_offset < 0) {
+		dev_err(&afu->dev, "Can't allocate %d PASIDs for AFU: %d\n",
+			pasid_count, pasid_offset);
+		return pasid_offset;
+	}
+	afu->pasid_base = fn->pasid_base + pasid_offset;
+	afu->pasid_count = 0;
+	afu->pasid_max = pasid_count;
+
+	ocxl_config_set_afu_pasid(dev, afu->config.dvsec_afu_control_pos,
+				afu->pasid_base,
+				afu->config.pasid_supported_log);
+	dev_dbg(&afu->dev, "PASID base=%d, enabled=%d\n",
+		afu->pasid_base, pasid_count);
+	return 0;
+}
+
+static void reclaim_afu_pasid(struct ocxl_afu *afu)
+{
+	struct ocxl_fn *fn = afu->fn;
+	int start_offset, size;
+
+	start_offset = afu->pasid_base - fn->pasid_base;
+	size = 1 << afu->config.pasid_supported_log;
+	ocxl_pasid_afu_free(afu->fn, start_offset, size);
+}
+
+static int reserve_fn_bar(struct ocxl_fn *fn, int bar)
+{
+	struct pci_dev *dev = to_pci_dev(fn->dev.parent);
+	int rc, idx;
+
+	if (bar != 0 && bar != 2 && bar != 4)
+		return -EINVAL;
+
+	idx = bar >> 1;
+	if (fn->bar_used[idx]++ == 0) {
+		rc = pci_request_region(dev, bar, "ocxl");
+		if (rc)
+			return rc;
+	}
+	return 0;
+}
+
+static void release_fn_bar(struct ocxl_fn *fn, int bar)
+{
+	struct pci_dev *dev = to_pci_dev(fn->dev.parent);
+	int idx;
+
+	if (bar != 0 && bar != 2 && bar != 4)
+		return;
+
+	idx = bar >> 1;
+	if (--fn->bar_used[idx] == 0)
+		pci_release_region(dev, bar);
+	WARN_ON(fn->bar_used[idx] < 0);
+}
+
+static int map_mmio_areas(struct ocxl_afu *afu, struct pci_dev *dev)
+{
+	int rc;
+
+	rc = reserve_fn_bar(afu->fn, afu->config.global_mmio_bar);
+	if (rc)
+		return rc;
+
+	rc = reserve_fn_bar(afu->fn, afu->config.pp_mmio_bar);
+	if (rc) {
+		release_fn_bar(afu->fn, afu->config.global_mmio_bar);
+		return rc;
+	}
+
+	afu->global_mmio_start =
+		pci_resource_start(dev, afu->config.global_mmio_bar) +
+		afu->config.global_mmio_offset;
+	afu->pp_mmio_start =
+		pci_resource_start(dev, afu->config.pp_mmio_bar) +
+		afu->config.pp_mmio_offset;
+
+	afu->global_mmio_ptr = ioremap(afu->global_mmio_start,
+				afu->config.global_mmio_size);
+	if (!afu->global_mmio_ptr) {
+		release_fn_bar(afu->fn, afu->config.pp_mmio_bar);
+		release_fn_bar(afu->fn, afu->config.global_mmio_bar);
+		dev_err(&dev->dev, "Error mapping global mmio area\n");
+		return -ENOMEM;
+	}
+
+	/*
+	 * Leave an empty page between the per-process mmio area and
+	 * the AFU interrupt mappings
+	 */
+	afu->irq_base_offset = afu->config.pp_mmio_stride + PAGE_SIZE;
+	return 0;
+}
+
+static void unmap_mmio_areas(struct ocxl_afu *afu)
+{
+	if (afu->global_mmio_ptr) {
+		iounmap(afu->global_mmio_ptr);
+		afu->global_mmio_ptr = NULL;
+	}
+	afu->global_mmio_start = 0;
+	afu->pp_mmio_start = 0;
+	release_fn_bar(afu->fn, afu->config.pp_mmio_bar);
+	release_fn_bar(afu->fn, afu->config.global_mmio_bar);
+}
+
+static int configure_afu(struct ocxl_afu *afu, u8 afu_idx, struct pci_dev *dev)
+{
+	int rc;
+
+	rc = ocxl_config_read_afu(dev, &afu->fn->config, &afu->config, afu_idx);
+	if (rc)
+		return rc;
+
+	rc = set_afu_device(afu, dev_name(&dev->dev));
+	if (rc)
+		return rc;
+
+	rc = assign_afu_actag(afu, dev);
+	if (rc)
+		return rc;
+
+	rc = assign_afu_pasid(afu, dev);
+	if (rc) {
+		reclaim_afu_actag(afu);
+		return rc;
+	}
+
+	rc = map_mmio_areas(afu, dev);
+	if (rc) {
+		reclaim_afu_pasid(afu);
+		reclaim_afu_actag(afu);
+		return rc;
+	}
+	return 0;
+}
+
+static void deconfigure_afu(struct ocxl_afu *afu)
+{
+	unmap_mmio_areas(afu);
+	reclaim_afu_pasid(afu);
+	reclaim_afu_actag(afu);
+}
+
+static int activate_afu(struct pci_dev *dev, struct ocxl_afu *afu)
+{
+	int rc;
+
+	ocxl_config_set_afu_state(dev, afu->config.dvsec_afu_control_pos, 1);
+	/*
+	 * Char device creation is the last step, as processes can
+	 * call our driver immediately, so all our inits must be finished.
+	 */
+	rc = ocxl_create_cdev(afu);
+	if (rc)
+		return rc;
+	return 0;
+}
+
+static void deactivate_afu(struct ocxl_afu *afu)
+{
+	struct pci_dev *dev = to_pci_dev(afu->fn->dev.parent);
+
+	ocxl_destroy_cdev(afu);
+	ocxl_config_set_afu_state(dev, afu->config.dvsec_afu_control_pos, 0);
+}
+
+int init_afu(struct pci_dev *dev, struct ocxl_fn *fn, u8 afu_idx)
+{
+	int rc;
+	struct ocxl_afu *afu;
+
+	afu = alloc_afu(fn);
+	if (!afu)
+		return -ENOMEM;
+
+	rc = configure_afu(afu, afu_idx, dev);
+	if (rc) {
+		free_afu(afu);
+		return rc;
+	}
+
+	rc = ocxl_register_afu(afu);
+	if (rc)
+		goto err;
+
+	rc = ocxl_sysfs_add_afu(afu);
+	if (rc)
+		goto err;
+
+	rc = activate_afu(dev, afu);
+	if (rc)
+		goto err_sys;
+
+	list_add_tail(&afu->list, &fn->afu_list);
+	return 0;
+
+err_sys:
+	ocxl_sysfs_remove_afu(afu);
+err:
+	deconfigure_afu(afu);
+	device_unregister(&afu->dev);
+	return rc;
+}
+
+void remove_afu(struct ocxl_afu *afu)
+{
+	list_del(&afu->list);
+	ocxl_context_detach_all(afu);
+	deactivate_afu(afu);
+	ocxl_sysfs_remove_afu(afu);
+	deconfigure_afu(afu);
+	device_unregister(&afu->dev);
+}
+
+static struct ocxl_fn *alloc_function(struct pci_dev *dev)
+{
+	struct ocxl_fn *fn;
+
+	fn = kzalloc(sizeof(struct ocxl_fn), GFP_KERNEL);
+	if (!fn)
+		return NULL;
+
+	INIT_LIST_HEAD(&fn->afu_list);
+	INIT_LIST_HEAD(&fn->pasid_list);
+	INIT_LIST_HEAD(&fn->actag_list);
+	return fn;
+}
+
+static void free_function(struct ocxl_fn *fn)
+{
+	WARN_ON(!list_empty(&fn->afu_list));
+	WARN_ON(!list_empty(&fn->pasid_list));
+	kfree(fn);
+}
+
+static void free_function_dev(struct device *dev)
+{
+	struct ocxl_fn *fn = to_ocxl_function(dev);
+
+	free_function(fn);
+}
+
+static int set_function_device(struct ocxl_fn *fn, struct pci_dev *dev)
+{
+	int rc;
+
+	fn->dev.parent = &dev->dev;
+	fn->dev.release = free_function_dev;
+	rc = dev_set_name(&fn->dev, "ocxlfn.%s", dev_name(&dev->dev));
+	if (rc)
+		return rc;
+	pci_set_drvdata(dev, fn);
+	return 0;
+}
+
+static int assign_function_actag(struct ocxl_fn *fn)
+{
+	struct pci_dev *dev = to_pci_dev(fn->dev.parent);
+	u16 base, enabled, supported;
+	int rc;
+
+	rc = ocxl_config_get_actag_info(dev, &base, &enabled, &supported);
+	if (rc)
+		return rc;
+
+	fn->actag_base = base;
+	fn->actag_enabled = enabled;
+	fn->actag_supported = supported;
+
+	ocxl_config_set_actag(dev, fn->config.dvsec_function_pos,
+			fn->actag_base,	fn->actag_enabled);
+	dev_dbg(&fn->dev, "actag range starting at %d, enabled %d\n",
+		fn->actag_base, fn->actag_enabled);
+	return 0;
+}
+
+static int set_function_pasid(struct ocxl_fn *fn)
+{
+	struct pci_dev *dev = to_pci_dev(fn->dev.parent);
+	int rc, desired_count, max_count;
+
+	/* A function may not require any PASID */
+	if (fn->config.max_pasid_log < 0)
+		return 0;
+
+	rc = ocxl_config_get_pasid_info(dev, &max_count);
+	if (rc)
+		return rc;
+
+	desired_count = 1 << fn->config.max_pasid_log;
+
+	if (desired_count > max_count) {
+		dev_err(&fn->dev,
+			"Function requires more PASIDs than is available (%d vs. %d)\n",
+			desired_count, max_count);
+		return -ENOSPC;
+	}
+
+	fn->pasid_base = 0;
+	return 0;
+}
+
+static int configure_function(struct ocxl_fn *fn, struct pci_dev *dev)
+{
+	int rc;
+
+	rc = pci_enable_device(dev);
+	if (rc) {
+		dev_err(&dev->dev, "pci_enable_device failed: %d\n", rc);
+		return rc;
+	}
+
+	/*
+	 * Once it has been confirmed to work on our hardware, we
+	 * should reset the function, to force the adapter to restart
+	 * from scratch.
+	 * A function reset would also reset all its AFUs.
+	 *
+	 * Some hints for implementation:
+	 *
+	 * - there's not status bit to know when the reset is done. We
+	 *   should try reading the config space to know when it's
+	 *   done.
+	 * - probably something like:
+	 *	Reset
+	 *	wait 100ms
+	 *	issue config read
+	 *	allow device up to 1 sec to return success on config
+	 *	read before declaring it broken
+	 *
+	 * Some shared logic on the card (CFG, TLX) won't be reset, so
+	 * there's no guarantee that it will be enough.
+	 */
+	rc = ocxl_config_read_function(dev, &fn->config);
+	if (rc)
+		return rc;
+
+	rc = set_function_device(fn, dev);
+	if (rc)
+		return rc;
+
+	rc = assign_function_actag(fn);
+	if (rc)
+		return rc;
+
+	rc = set_function_pasid(fn);
+	if (rc)
+		return rc;
+
+	rc = ocxl_link_setup(dev, 0, &fn->link);
+	if (rc)
+		return rc;
+
+	rc = ocxl_config_set_TL(dev, fn->config.dvsec_tl_pos);
+	if (rc) {
+		ocxl_link_release(dev, fn->link);
+		return rc;
+	}
+	return 0;
+}
+
+static void deconfigure_function(struct ocxl_fn *fn)
+{
+	struct pci_dev *dev = to_pci_dev(fn->dev.parent);
+
+	ocxl_link_release(dev, fn->link);
+	pci_disable_device(dev);
+}
+
+struct ocxl_fn *init_function(struct pci_dev *dev)
+{
+	struct ocxl_fn *fn;
+	int rc;
+
+	fn = alloc_function(dev);
+	if (!fn)
+		return ERR_PTR(-ENOMEM);
+
+	rc = configure_function(fn, dev);
+	if (rc) {
+		free_function(fn);
+		return ERR_PTR(rc);
+	}
+
+	rc = device_register(&fn->dev);
+	if (rc) {
+		deconfigure_function(fn);
+		put_device(&fn->dev);
+		return ERR_PTR(rc);
+	}
+	return fn;
+}
+
+void remove_function(struct ocxl_fn *fn)
+{
+	deconfigure_function(fn);
+	device_unregister(&fn->dev);
+}
diff --git a/drivers/misc/ocxl/ocxl_internal.h b/drivers/misc/ocxl/ocxl_internal.h
index 06fd98c989c8..81086534dab5 100644
--- a/drivers/misc/ocxl/ocxl_internal.h
+++ b/drivers/misc/ocxl/ocxl_internal.h
@@ -150,4 +150,9 @@ int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, u64 irq_offset,
 			int eventfd);
 u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, u64 irq_offset);
 
+struct ocxl_fn *init_function(struct pci_dev *dev);
+void remove_function(struct ocxl_fn *fn);
+int init_afu(struct pci_dev *dev, struct ocxl_fn *fn, u8 afu_idx);
+void remove_afu(struct ocxl_afu *afu);
+
 #endif /* _OCXL_INTERNAL_H_ */
diff --git a/drivers/misc/ocxl/pci.c b/drivers/misc/ocxl/pci.c
index 21f425472a82..4ed7cb1a667f 100644
--- a/drivers/misc/ocxl/pci.c
+++ b/drivers/misc/ocxl/pci.c
@@ -1,9 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
-// Copyright 2017 IBM Corp.
+// Copyright 2019 IBM Corp.
 #include <linux/module.h>
-#include <linux/pci.h>
-#include <linux/idr.h>
-#include <asm/pnv-ocxl.h>
 #include "ocxl_internal.h"
 
 /*
@@ -17,520 +14,6 @@ static const struct pci_device_id ocxl_pci_tbl[] = {
 };
 MODULE_DEVICE_TABLE(pci, ocxl_pci_tbl);
 
-
-static struct ocxl_fn *ocxl_fn_get(struct ocxl_fn *fn)
-{
-	return (get_device(&fn->dev) == NULL) ? NULL : fn;
-}
-
-static void ocxl_fn_put(struct ocxl_fn *fn)
-{
-	put_device(&fn->dev);
-}
-
-struct ocxl_afu *ocxl_afu_get(struct ocxl_afu *afu)
-{
-	return (get_device(&afu->dev) == NULL) ? NULL : afu;
-}
-
-void ocxl_afu_put(struct ocxl_afu *afu)
-{
-	put_device(&afu->dev);
-}
-
-static struct ocxl_afu *alloc_afu(struct ocxl_fn *fn)
-{
-	struct ocxl_afu *afu;
-
-	afu = kzalloc(sizeof(struct ocxl_afu), GFP_KERNEL);
-	if (!afu)
-		return NULL;
-
-	mutex_init(&afu->contexts_lock);
-	mutex_init(&afu->afu_control_lock);
-	idr_init(&afu->contexts_idr);
-	afu->fn = fn;
-	ocxl_fn_get(fn);
-	return afu;
-}
-
-static void free_afu(struct ocxl_afu *afu)
-{
-	idr_destroy(&afu->contexts_idr);
-	ocxl_fn_put(afu->fn);
-	kfree(afu);
-}
-
-static void free_afu_dev(struct device *dev)
-{
-	struct ocxl_afu *afu = to_ocxl_afu(dev);
-
-	ocxl_unregister_afu(afu);
-	free_afu(afu);
-}
-
-static int set_afu_device(struct ocxl_afu *afu, const char *location)
-{
-	struct ocxl_fn *fn = afu->fn;
-	int rc;
-
-	afu->dev.parent = &fn->dev;
-	afu->dev.release = free_afu_dev;
-	rc = dev_set_name(&afu->dev, "%s.%s.%hhu", afu->config.name, location,
-		afu->config.idx);
-	return rc;
-}
-
-static int assign_afu_actag(struct ocxl_afu *afu, struct pci_dev *dev)
-{
-	struct ocxl_fn *fn = afu->fn;
-	int actag_count, actag_offset;
-
-	/*
-	 * if there were not enough actags for the function, each afu
-	 * reduces its count as well
-	 */
-	actag_count = afu->config.actag_supported *
-		fn->actag_enabled / fn->actag_supported;
-	actag_offset = ocxl_actag_afu_alloc(fn, actag_count);
-	if (actag_offset < 0) {
-		dev_err(&afu->dev, "Can't allocate %d actags for AFU: %d\n",
-			actag_count, actag_offset);
-		return actag_offset;
-	}
-	afu->actag_base = fn->actag_base + actag_offset;
-	afu->actag_enabled = actag_count;
-
-	ocxl_config_set_afu_actag(dev, afu->config.dvsec_afu_control_pos,
-				afu->actag_base, afu->actag_enabled);
-	dev_dbg(&afu->dev, "actag base=%d enabled=%d\n",
-		afu->actag_base, afu->actag_enabled);
-	return 0;
-}
-
-static void reclaim_afu_actag(struct ocxl_afu *afu)
-{
-	struct ocxl_fn *fn = afu->fn;
-	int start_offset, size;
-
-	start_offset = afu->actag_base - fn->actag_base;
-	size = afu->actag_enabled;
-	ocxl_actag_afu_free(afu->fn, start_offset, size);
-}
-
-static int assign_afu_pasid(struct ocxl_afu *afu, struct pci_dev *dev)
-{
-	struct ocxl_fn *fn = afu->fn;
-	int pasid_count, pasid_offset;
-
-	/*
-	 * We only support the case where the function configuration
-	 * requested enough PASIDs to cover all AFUs.
-	 */
-	pasid_count = 1 << afu->config.pasid_supported_log;
-	pasid_offset = ocxl_pasid_afu_alloc(fn, pasid_count);
-	if (pasid_offset < 0) {
-		dev_err(&afu->dev, "Can't allocate %d PASIDs for AFU: %d\n",
-			pasid_count, pasid_offset);
-		return pasid_offset;
-	}
-	afu->pasid_base = fn->pasid_base + pasid_offset;
-	afu->pasid_count = 0;
-	afu->pasid_max = pasid_count;
-
-	ocxl_config_set_afu_pasid(dev, afu->config.dvsec_afu_control_pos,
-				afu->pasid_base,
-				afu->config.pasid_supported_log);
-	dev_dbg(&afu->dev, "PASID base=%d, enabled=%d\n",
-		afu->pasid_base, pasid_count);
-	return 0;
-}
-
-static void reclaim_afu_pasid(struct ocxl_afu *afu)
-{
-	struct ocxl_fn *fn = afu->fn;
-	int start_offset, size;
-
-	start_offset = afu->pasid_base - fn->pasid_base;
-	size = 1 << afu->config.pasid_supported_log;
-	ocxl_pasid_afu_free(afu->fn, start_offset, size);
-}
-
-static int reserve_fn_bar(struct ocxl_fn *fn, int bar)
-{
-	struct pci_dev *dev = to_pci_dev(fn->dev.parent);
-	int rc, idx;
-
-	if (bar != 0 && bar != 2 && bar != 4)
-		return -EINVAL;
-
-	idx = bar >> 1;
-	if (fn->bar_used[idx]++ == 0) {
-		rc = pci_request_region(dev, bar, "ocxl");
-		if (rc)
-			return rc;
-	}
-	return 0;
-}
-
-static void release_fn_bar(struct ocxl_fn *fn, int bar)
-{
-	struct pci_dev *dev = to_pci_dev(fn->dev.parent);
-	int idx;
-
-	if (bar != 0 && bar != 2 && bar != 4)
-		return;
-
-	idx = bar >> 1;
-	if (--fn->bar_used[idx] == 0)
-		pci_release_region(dev, bar);
-	WARN_ON(fn->bar_used[idx] < 0);
-}
-
-static int map_mmio_areas(struct ocxl_afu *afu, struct pci_dev *dev)
-{
-	int rc;
-
-	rc = reserve_fn_bar(afu->fn, afu->config.global_mmio_bar);
-	if (rc)
-		return rc;
-
-	rc = reserve_fn_bar(afu->fn, afu->config.pp_mmio_bar);
-	if (rc) {
-		release_fn_bar(afu->fn, afu->config.global_mmio_bar);
-		return rc;
-	}
-
-	afu->global_mmio_start =
-		pci_resource_start(dev, afu->config.global_mmio_bar) +
-		afu->config.global_mmio_offset;
-	afu->pp_mmio_start =
-		pci_resource_start(dev, afu->config.pp_mmio_bar) +
-		afu->config.pp_mmio_offset;
-
-	afu->global_mmio_ptr = ioremap(afu->global_mmio_start,
-				afu->config.global_mmio_size);
-	if (!afu->global_mmio_ptr) {
-		release_fn_bar(afu->fn, afu->config.pp_mmio_bar);
-		release_fn_bar(afu->fn, afu->config.global_mmio_bar);
-		dev_err(&dev->dev, "Error mapping global mmio area\n");
-		return -ENOMEM;
-	}
-
-	/*
-	 * Leave an empty page between the per-process mmio area and
-	 * the AFU interrupt mappings
-	 */
-	afu->irq_base_offset = afu->config.pp_mmio_stride + PAGE_SIZE;
-	return 0;
-}
-
-static void unmap_mmio_areas(struct ocxl_afu *afu)
-{
-	if (afu->global_mmio_ptr) {
-		iounmap(afu->global_mmio_ptr);
-		afu->global_mmio_ptr = NULL;
-	}
-	afu->global_mmio_start = 0;
-	afu->pp_mmio_start = 0;
-	release_fn_bar(afu->fn, afu->config.pp_mmio_bar);
-	release_fn_bar(afu->fn, afu->config.global_mmio_bar);
-}
-
-static int configure_afu(struct ocxl_afu *afu, u8 afu_idx, struct pci_dev *dev)
-{
-	int rc;
-
-	rc = ocxl_config_read_afu(dev, &afu->fn->config, &afu->config, afu_idx);
-	if (rc)
-		return rc;
-
-	rc = set_afu_device(afu, dev_name(&dev->dev));
-	if (rc)
-		return rc;
-
-	rc = assign_afu_actag(afu, dev);
-	if (rc)
-		return rc;
-
-	rc = assign_afu_pasid(afu, dev);
-	if (rc) {
-		reclaim_afu_actag(afu);
-		return rc;
-	}
-
-	rc = map_mmio_areas(afu, dev);
-	if (rc) {
-		reclaim_afu_pasid(afu);
-		reclaim_afu_actag(afu);
-		return rc;
-	}
-	return 0;
-}
-
-static void deconfigure_afu(struct ocxl_afu *afu)
-{
-	unmap_mmio_areas(afu);
-	reclaim_afu_pasid(afu);
-	reclaim_afu_actag(afu);
-}
-
-static int activate_afu(struct pci_dev *dev, struct ocxl_afu *afu)
-{
-	int rc;
-
-	ocxl_config_set_afu_state(dev, afu->config.dvsec_afu_control_pos, 1);
-	/*
-	 * Char device creation is the last step, as processes can
-	 * call our driver immediately, so all our inits must be finished.
-	 */
-	rc = ocxl_create_cdev(afu);
-	if (rc)
-		return rc;
-	return 0;
-}
-
-static void deactivate_afu(struct ocxl_afu *afu)
-{
-	struct pci_dev *dev = to_pci_dev(afu->fn->dev.parent);
-
-	ocxl_destroy_cdev(afu);
-	ocxl_config_set_afu_state(dev, afu->config.dvsec_afu_control_pos, 0);
-}
-
-static int init_afu(struct pci_dev *dev, struct ocxl_fn *fn, u8 afu_idx)
-{
-	int rc;
-	struct ocxl_afu *afu;
-
-	afu = alloc_afu(fn);
-	if (!afu)
-		return -ENOMEM;
-
-	rc = configure_afu(afu, afu_idx, dev);
-	if (rc) {
-		free_afu(afu);
-		return rc;
-	}
-
-	rc = ocxl_register_afu(afu);
-	if (rc)
-		goto err;
-
-	rc = ocxl_sysfs_add_afu(afu);
-	if (rc)
-		goto err;
-
-	rc = activate_afu(dev, afu);
-	if (rc)
-		goto err_sys;
-
-	list_add_tail(&afu->list, &fn->afu_list);
-	return 0;
-
-err_sys:
-	ocxl_sysfs_remove_afu(afu);
-err:
-	deconfigure_afu(afu);
-	device_unregister(&afu->dev);
-	return rc;
-}
-
-static void remove_afu(struct ocxl_afu *afu)
-{
-	list_del(&afu->list);
-	ocxl_context_detach_all(afu);
-	deactivate_afu(afu);
-	ocxl_sysfs_remove_afu(afu);
-	deconfigure_afu(afu);
-	device_unregister(&afu->dev);
-}
-
-static struct ocxl_fn *alloc_function(struct pci_dev *dev)
-{
-	struct ocxl_fn *fn;
-
-	fn = kzalloc(sizeof(struct ocxl_fn), GFP_KERNEL);
-	if (!fn)
-		return NULL;
-
-	INIT_LIST_HEAD(&fn->afu_list);
-	INIT_LIST_HEAD(&fn->pasid_list);
-	INIT_LIST_HEAD(&fn->actag_list);
-	return fn;
-}
-
-static void free_function(struct ocxl_fn *fn)
-{
-	WARN_ON(!list_empty(&fn->afu_list));
-	WARN_ON(!list_empty(&fn->pasid_list));
-	kfree(fn);
-}
-
-static void free_function_dev(struct device *dev)
-{
-	struct ocxl_fn *fn = to_ocxl_function(dev);
-
-	free_function(fn);
-}
-
-static int set_function_device(struct ocxl_fn *fn, struct pci_dev *dev)
-{
-	int rc;
-
-	fn->dev.parent = &dev->dev;
-	fn->dev.release = free_function_dev;
-	rc = dev_set_name(&fn->dev, "ocxlfn.%s", dev_name(&dev->dev));
-	if (rc)
-		return rc;
-	pci_set_drvdata(dev, fn);
-	return 0;
-}
-
-static int assign_function_actag(struct ocxl_fn *fn)
-{
-	struct pci_dev *dev = to_pci_dev(fn->dev.parent);
-	u16 base, enabled, supported;
-	int rc;
-
-	rc = ocxl_config_get_actag_info(dev, &base, &enabled, &supported);
-	if (rc)
-		return rc;
-
-	fn->actag_base = base;
-	fn->actag_enabled = enabled;
-	fn->actag_supported = supported;
-
-	ocxl_config_set_actag(dev, fn->config.dvsec_function_pos,
-			fn->actag_base,	fn->actag_enabled);
-	dev_dbg(&fn->dev, "actag range starting at %d, enabled %d\n",
-		fn->actag_base, fn->actag_enabled);
-	return 0;
-}
-
-static int set_function_pasid(struct ocxl_fn *fn)
-{
-	struct pci_dev *dev = to_pci_dev(fn->dev.parent);
-	int rc, desired_count, max_count;
-
-	/* A function may not require any PASID */
-	if (fn->config.max_pasid_log < 0)
-		return 0;
-
-	rc = ocxl_config_get_pasid_info(dev, &max_count);
-	if (rc)
-		return rc;
-
-	desired_count = 1 << fn->config.max_pasid_log;
-
-	if (desired_count > max_count) {
-		dev_err(&fn->dev,
-			"Function requires more PASIDs than is available (%d vs. %d)\n",
-			desired_count, max_count);
-		return -ENOSPC;
-	}
-
-	fn->pasid_base = 0;
-	return 0;
-}
-
-static int configure_function(struct ocxl_fn *fn, struct pci_dev *dev)
-{
-	int rc;
-
-	rc = pci_enable_device(dev);
-	if (rc) {
-		dev_err(&dev->dev, "pci_enable_device failed: %d\n", rc);
-		return rc;
-	}
-
-	/*
-	 * Once it has been confirmed to work on our hardware, we
-	 * should reset the function, to force the adapter to restart
-	 * from scratch.
-	 * A function reset would also reset all its AFUs.
-	 *
-	 * Some hints for implementation:
-	 *
-	 * - there's not status bit to know when the reset is done. We
-	 *   should try reading the config space to know when it's
-	 *   done.
-	 * - probably something like:
-	 *	Reset
-	 *	wait 100ms
-	 *	issue config read
-	 *	allow device up to 1 sec to return success on config
-	 *	read before declaring it broken
-	 *
-	 * Some shared logic on the card (CFG, TLX) won't be reset, so
-	 * there's no guarantee that it will be enough.
-	 */
-	rc = ocxl_config_read_function(dev, &fn->config);
-	if (rc)
-		return rc;
-
-	rc = set_function_device(fn, dev);
-	if (rc)
-		return rc;
-
-	rc = assign_function_actag(fn);
-	if (rc)
-		return rc;
-
-	rc = set_function_pasid(fn);
-	if (rc)
-		return rc;
-
-	rc = ocxl_link_setup(dev, 0, &fn->link);
-	if (rc)
-		return rc;
-
-	rc = ocxl_config_set_TL(dev, fn->config.dvsec_tl_pos);
-	if (rc) {
-		ocxl_link_release(dev, fn->link);
-		return rc;
-	}
-	return 0;
-}
-
-static void deconfigure_function(struct ocxl_fn *fn)
-{
-	struct pci_dev *dev = to_pci_dev(fn->dev.parent);
-
-	ocxl_link_release(dev, fn->link);
-	pci_disable_device(dev);
-}
-
-static struct ocxl_fn *init_function(struct pci_dev *dev)
-{
-	struct ocxl_fn *fn;
-	int rc;
-
-	fn = alloc_function(dev);
-	if (!fn)
-		return ERR_PTR(-ENOMEM);
-
-	rc = configure_function(fn, dev);
-	if (rc) {
-		free_function(fn);
-		return ERR_PTR(rc);
-	}
-
-	rc = device_register(&fn->dev);
-	if (rc) {
-		deconfigure_function(fn);
-		put_device(&fn->dev);
-		return ERR_PTR(rc);
-	}
-	return fn;
-}
-
-static void remove_function(struct ocxl_fn *fn)
-{
-	deconfigure_function(fn);
-	device_unregister(&fn->dev);
-}
-
 static int ocxl_probe(struct pci_dev *dev, const struct pci_device_id *id)
 {
 	int rc, afu_count = 0;
-- 
2.20.1