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-rw-r--r--drivers/firmware/arm_ffa/Kconfig21
-rw-r--r--drivers/firmware/arm_ffa/Makefile6
-rw-r--r--drivers/firmware/arm_ffa/bus.c232
-rw-r--r--drivers/firmware/arm_ffa/common.h31
-rw-r--r--drivers/firmware/arm_ffa/driver.c787
-rw-r--r--drivers/firmware/arm_ffa/smccc.c39
6 files changed, 1116 insertions, 0 deletions
diff --git a/drivers/firmware/arm_ffa/Kconfig b/drivers/firmware/arm_ffa/Kconfig
new file mode 100644
index 0000000000..5e3ae5cf82
--- /dev/null
+++ b/drivers/firmware/arm_ffa/Kconfig
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config ARM_FFA_TRANSPORT
+ tristate "Arm Firmware Framework for Armv8-A"
+ depends on OF
+ depends on ARM64
+ default n
+ help
+ This Firmware Framework(FF) for Arm A-profile processors describes
+ interfaces that standardize communication between the various
+ software images which includes communication between images in
+ the Secure world and Normal world. It also leverages the
+ virtualization extension to isolate software images provided
+ by an ecosystem of vendors from each other.
+
+ This driver provides interface for all the client drivers making
+ use of the features offered by ARM FF-A.
+
+config ARM_FFA_SMCCC
+ bool
+ default ARM_FFA_TRANSPORT
+ depends on ARM64 && HAVE_ARM_SMCCC_DISCOVERY
diff --git a/drivers/firmware/arm_ffa/Makefile b/drivers/firmware/arm_ffa/Makefile
new file mode 100644
index 0000000000..9d9f375232
--- /dev/null
+++ b/drivers/firmware/arm_ffa/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+ffa-bus-y = bus.o
+ffa-driver-y = driver.o
+ffa-transport-$(CONFIG_ARM_FFA_SMCCC) += smccc.o
+ffa-module-objs := $(ffa-bus-y) $(ffa-driver-y) $(ffa-transport-y)
+obj-$(CONFIG_ARM_FFA_TRANSPORT) = ffa-module.o
diff --git a/drivers/firmware/arm_ffa/bus.c b/drivers/firmware/arm_ffa/bus.c
new file mode 100644
index 0000000000..7865438b36
--- /dev/null
+++ b/drivers/firmware/arm_ffa/bus.c
@@ -0,0 +1,232 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 ARM Ltd.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/arm_ffa.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include "common.h"
+
+static DEFINE_IDA(ffa_bus_id);
+
+static int ffa_device_match(struct device *dev, struct device_driver *drv)
+{
+ const struct ffa_device_id *id_table;
+ struct ffa_device *ffa_dev;
+
+ id_table = to_ffa_driver(drv)->id_table;
+ ffa_dev = to_ffa_dev(dev);
+
+ while (!uuid_is_null(&id_table->uuid)) {
+ /*
+ * FF-A v1.0 doesn't provide discovery of UUIDs, just the
+ * partition IDs, so fetch the partitions IDs for this
+ * id_table UUID and assign the UUID to the device if the
+ * partition ID matches
+ */
+ if (uuid_is_null(&ffa_dev->uuid))
+ ffa_device_match_uuid(ffa_dev, &id_table->uuid);
+
+ if (uuid_equal(&ffa_dev->uuid, &id_table->uuid))
+ return 1;
+ id_table++;
+ }
+
+ return 0;
+}
+
+static int ffa_device_probe(struct device *dev)
+{
+ struct ffa_driver *ffa_drv = to_ffa_driver(dev->driver);
+ struct ffa_device *ffa_dev = to_ffa_dev(dev);
+
+ return ffa_drv->probe(ffa_dev);
+}
+
+static void ffa_device_remove(struct device *dev)
+{
+ struct ffa_driver *ffa_drv = to_ffa_driver(dev->driver);
+
+ if (ffa_drv->remove)
+ ffa_drv->remove(to_ffa_dev(dev));
+}
+
+static int ffa_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
+{
+ const struct ffa_device *ffa_dev = to_ffa_dev(dev);
+
+ return add_uevent_var(env, "MODALIAS=arm_ffa:%04x:%pUb",
+ ffa_dev->vm_id, &ffa_dev->uuid);
+}
+
+static ssize_t partition_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ffa_device *ffa_dev = to_ffa_dev(dev);
+
+ return sprintf(buf, "0x%04x\n", ffa_dev->vm_id);
+}
+static DEVICE_ATTR_RO(partition_id);
+
+static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct ffa_device *ffa_dev = to_ffa_dev(dev);
+
+ return sprintf(buf, "%pUb\n", &ffa_dev->uuid);
+}
+static DEVICE_ATTR_RO(uuid);
+
+static struct attribute *ffa_device_attributes_attrs[] = {
+ &dev_attr_partition_id.attr,
+ &dev_attr_uuid.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(ffa_device_attributes);
+
+struct bus_type ffa_bus_type = {
+ .name = "arm_ffa",
+ .match = ffa_device_match,
+ .probe = ffa_device_probe,
+ .remove = ffa_device_remove,
+ .uevent = ffa_device_uevent,
+ .dev_groups = ffa_device_attributes_groups,
+};
+EXPORT_SYMBOL_GPL(ffa_bus_type);
+
+int ffa_driver_register(struct ffa_driver *driver, struct module *owner,
+ const char *mod_name)
+{
+ int ret;
+
+ if (!driver->probe)
+ return -EINVAL;
+
+ driver->driver.bus = &ffa_bus_type;
+ driver->driver.name = driver->name;
+ driver->driver.owner = owner;
+ driver->driver.mod_name = mod_name;
+
+ ret = driver_register(&driver->driver);
+ if (!ret)
+ pr_debug("registered new ffa driver %s\n", driver->name);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ffa_driver_register);
+
+void ffa_driver_unregister(struct ffa_driver *driver)
+{
+ driver_unregister(&driver->driver);
+}
+EXPORT_SYMBOL_GPL(ffa_driver_unregister);
+
+static void ffa_release_device(struct device *dev)
+{
+ struct ffa_device *ffa_dev = to_ffa_dev(dev);
+
+ ida_free(&ffa_bus_id, ffa_dev->id);
+ kfree(ffa_dev);
+}
+
+static int __ffa_devices_unregister(struct device *dev, void *data)
+{
+ device_unregister(dev);
+
+ return 0;
+}
+
+static void ffa_devices_unregister(void)
+{
+ bus_for_each_dev(&ffa_bus_type, NULL, NULL,
+ __ffa_devices_unregister);
+}
+
+bool ffa_device_is_valid(struct ffa_device *ffa_dev)
+{
+ bool valid = false;
+ struct device *dev = NULL;
+ struct ffa_device *tmp_dev;
+
+ do {
+ dev = bus_find_next_device(&ffa_bus_type, dev);
+ tmp_dev = to_ffa_dev(dev);
+ if (tmp_dev == ffa_dev) {
+ valid = true;
+ break;
+ }
+ put_device(dev);
+ } while (dev);
+
+ put_device(dev);
+
+ return valid;
+}
+
+struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id,
+ const struct ffa_ops *ops)
+{
+ int id, ret;
+ struct device *dev;
+ struct ffa_device *ffa_dev;
+
+ id = ida_alloc_min(&ffa_bus_id, 1, GFP_KERNEL);
+ if (id < 0)
+ return NULL;
+
+ ffa_dev = kzalloc(sizeof(*ffa_dev), GFP_KERNEL);
+ if (!ffa_dev) {
+ ida_free(&ffa_bus_id, id);
+ return NULL;
+ }
+
+ dev = &ffa_dev->dev;
+ dev->bus = &ffa_bus_type;
+ dev->release = ffa_release_device;
+ dev_set_name(&ffa_dev->dev, "arm-ffa-%d", id);
+
+ ffa_dev->id = id;
+ ffa_dev->vm_id = vm_id;
+ ffa_dev->ops = ops;
+ uuid_copy(&ffa_dev->uuid, uuid);
+
+ ret = device_register(&ffa_dev->dev);
+ if (ret) {
+ dev_err(dev, "unable to register device %s err=%d\n",
+ dev_name(dev), ret);
+ put_device(dev);
+ return NULL;
+ }
+
+ return ffa_dev;
+}
+EXPORT_SYMBOL_GPL(ffa_device_register);
+
+void ffa_device_unregister(struct ffa_device *ffa_dev)
+{
+ if (!ffa_dev)
+ return;
+
+ device_unregister(&ffa_dev->dev);
+}
+EXPORT_SYMBOL_GPL(ffa_device_unregister);
+
+int arm_ffa_bus_init(void)
+{
+ return bus_register(&ffa_bus_type);
+}
+
+void arm_ffa_bus_exit(void)
+{
+ ffa_devices_unregister();
+ bus_unregister(&ffa_bus_type);
+ ida_destroy(&ffa_bus_id);
+}
diff --git a/drivers/firmware/arm_ffa/common.h b/drivers/firmware/arm_ffa/common.h
new file mode 100644
index 0000000000..d6eccf1fd3
--- /dev/null
+++ b/drivers/firmware/arm_ffa/common.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2021 ARM Ltd.
+ */
+
+#ifndef _FFA_COMMON_H
+#define _FFA_COMMON_H
+
+#include <linux/arm_ffa.h>
+#include <linux/arm-smccc.h>
+#include <linux/err.h>
+
+typedef struct arm_smccc_1_2_regs ffa_value_t;
+
+typedef void (ffa_fn)(ffa_value_t, ffa_value_t *);
+
+int arm_ffa_bus_init(void);
+void arm_ffa_bus_exit(void);
+bool ffa_device_is_valid(struct ffa_device *ffa_dev);
+void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid);
+
+#ifdef CONFIG_ARM_FFA_SMCCC
+int __init ffa_transport_init(ffa_fn **invoke_ffa_fn);
+#else
+static inline int __init ffa_transport_init(ffa_fn **invoke_ffa_fn)
+{
+ return -EOPNOTSUPP;
+}
+#endif
+
+#endif /* _FFA_COMMON_H */
diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
new file mode 100644
index 0000000000..7cd6b1564e
--- /dev/null
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -0,0 +1,787 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Arm Firmware Framework for ARMv8-A(FFA) interface driver
+ *
+ * The Arm FFA specification[1] describes a software architecture to
+ * leverages the virtualization extension to isolate software images
+ * provided by an ecosystem of vendors from each other and describes
+ * interfaces that standardize communication between the various software
+ * images including communication between images in the Secure world and
+ * Normal world. Any Hypervisor could use the FFA interfaces to enable
+ * communication between VMs it manages.
+ *
+ * The Hypervisor a.k.a Partition managers in FFA terminology can assign
+ * system resources(Memory regions, Devices, CPU cycles) to the partitions
+ * and manage isolation amongst them.
+ *
+ * [1] https://developer.arm.com/docs/den0077/latest
+ *
+ * Copyright (C) 2021 ARM Ltd.
+ */
+
+#define DRIVER_NAME "ARM FF-A"
+#define pr_fmt(fmt) DRIVER_NAME ": " fmt
+
+#include <linux/arm_ffa.h>
+#include <linux/bitfield.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <linux/uuid.h>
+
+#include "common.h"
+
+#define FFA_DRIVER_VERSION FFA_VERSION_1_0
+#define FFA_MIN_VERSION FFA_VERSION_1_0
+
+#define SENDER_ID_MASK GENMASK(31, 16)
+#define RECEIVER_ID_MASK GENMASK(15, 0)
+#define SENDER_ID(x) ((u16)(FIELD_GET(SENDER_ID_MASK, (x))))
+#define RECEIVER_ID(x) ((u16)(FIELD_GET(RECEIVER_ID_MASK, (x))))
+#define PACK_TARGET_INFO(s, r) \
+ (FIELD_PREP(SENDER_ID_MASK, (s)) | FIELD_PREP(RECEIVER_ID_MASK, (r)))
+
+/*
+ * Keeping RX TX buffer size as 4K for now
+ * 64K may be preferred to keep it min a page in 64K PAGE_SIZE config
+ */
+#define RXTX_BUFFER_SIZE SZ_4K
+
+static ffa_fn *invoke_ffa_fn;
+
+static const int ffa_linux_errmap[] = {
+ /* better than switch case as long as return value is continuous */
+ 0, /* FFA_RET_SUCCESS */
+ -EOPNOTSUPP, /* FFA_RET_NOT_SUPPORTED */
+ -EINVAL, /* FFA_RET_INVALID_PARAMETERS */
+ -ENOMEM, /* FFA_RET_NO_MEMORY */
+ -EBUSY, /* FFA_RET_BUSY */
+ -EINTR, /* FFA_RET_INTERRUPTED */
+ -EACCES, /* FFA_RET_DENIED */
+ -EAGAIN, /* FFA_RET_RETRY */
+ -ECANCELED, /* FFA_RET_ABORTED */
+};
+
+static inline int ffa_to_linux_errno(int errno)
+{
+ int err_idx = -errno;
+
+ if (err_idx >= 0 && err_idx < ARRAY_SIZE(ffa_linux_errmap))
+ return ffa_linux_errmap[err_idx];
+ return -EINVAL;
+}
+
+struct ffa_drv_info {
+ u32 version;
+ u16 vm_id;
+ struct mutex rx_lock; /* lock to protect Rx buffer */
+ struct mutex tx_lock; /* lock to protect Tx buffer */
+ void *rx_buffer;
+ void *tx_buffer;
+ bool mem_ops_native;
+};
+
+static struct ffa_drv_info *drv_info;
+
+/*
+ * The driver must be able to support all the versions from the earliest
+ * supported FFA_MIN_VERSION to the latest supported FFA_DRIVER_VERSION.
+ * The specification states that if firmware supports a FFA implementation
+ * that is incompatible with and at a greater version number than specified
+ * by the caller(FFA_DRIVER_VERSION passed as parameter to FFA_VERSION),
+ * it must return the NOT_SUPPORTED error code.
+ */
+static u32 ffa_compatible_version_find(u32 version)
+{
+ u16 major = FFA_MAJOR_VERSION(version), minor = FFA_MINOR_VERSION(version);
+ u16 drv_major = FFA_MAJOR_VERSION(FFA_DRIVER_VERSION);
+ u16 drv_minor = FFA_MINOR_VERSION(FFA_DRIVER_VERSION);
+
+ if ((major < drv_major) || (major == drv_major && minor <= drv_minor))
+ return version;
+
+ pr_info("Firmware version higher than driver version, downgrading\n");
+ return FFA_DRIVER_VERSION;
+}
+
+static int ffa_version_check(u32 *version)
+{
+ ffa_value_t ver;
+
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_VERSION, .a1 = FFA_DRIVER_VERSION,
+ }, &ver);
+
+ if (ver.a0 == FFA_RET_NOT_SUPPORTED) {
+ pr_info("FFA_VERSION returned not supported\n");
+ return -EOPNOTSUPP;
+ }
+
+ if (ver.a0 < FFA_MIN_VERSION) {
+ pr_err("Incompatible v%d.%d! Earliest supported v%d.%d\n",
+ FFA_MAJOR_VERSION(ver.a0), FFA_MINOR_VERSION(ver.a0),
+ FFA_MAJOR_VERSION(FFA_MIN_VERSION),
+ FFA_MINOR_VERSION(FFA_MIN_VERSION));
+ return -EINVAL;
+ }
+
+ pr_info("Driver version %d.%d\n", FFA_MAJOR_VERSION(FFA_DRIVER_VERSION),
+ FFA_MINOR_VERSION(FFA_DRIVER_VERSION));
+ pr_info("Firmware version %d.%d found\n", FFA_MAJOR_VERSION(ver.a0),
+ FFA_MINOR_VERSION(ver.a0));
+ *version = ffa_compatible_version_find(ver.a0);
+
+ return 0;
+}
+
+static int ffa_rx_release(void)
+{
+ ffa_value_t ret;
+
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_RX_RELEASE,
+ }, &ret);
+
+ if (ret.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)ret.a2);
+
+ /* check for ret.a0 == FFA_RX_RELEASE ? */
+
+ return 0;
+}
+
+static int ffa_rxtx_map(phys_addr_t tx_buf, phys_addr_t rx_buf, u32 pg_cnt)
+{
+ ffa_value_t ret;
+
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_FN_NATIVE(RXTX_MAP),
+ .a1 = tx_buf, .a2 = rx_buf, .a3 = pg_cnt,
+ }, &ret);
+
+ if (ret.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)ret.a2);
+
+ return 0;
+}
+
+static int ffa_rxtx_unmap(u16 vm_id)
+{
+ ffa_value_t ret;
+
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_RXTX_UNMAP, .a1 = PACK_TARGET_INFO(vm_id, 0),
+ }, &ret);
+
+ if (ret.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)ret.a2);
+
+ return 0;
+}
+
+#define PARTITION_INFO_GET_RETURN_COUNT_ONLY BIT(0)
+
+/* buffer must be sizeof(struct ffa_partition_info) * num_partitions */
+static int
+__ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
+ struct ffa_partition_info *buffer, int num_partitions)
+{
+ int idx, count, flags = 0, sz, buf_sz;
+ ffa_value_t partition_info;
+
+ if (drv_info->version > FFA_VERSION_1_0 &&
+ (!buffer || !num_partitions)) /* Just get the count for now */
+ flags = PARTITION_INFO_GET_RETURN_COUNT_ONLY;
+
+ mutex_lock(&drv_info->rx_lock);
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_PARTITION_INFO_GET,
+ .a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3,
+ .a5 = flags,
+ }, &partition_info);
+
+ if (partition_info.a0 == FFA_ERROR) {
+ mutex_unlock(&drv_info->rx_lock);
+ return ffa_to_linux_errno((int)partition_info.a2);
+ }
+
+ count = partition_info.a2;
+
+ if (drv_info->version > FFA_VERSION_1_0) {
+ buf_sz = sz = partition_info.a3;
+ if (sz > sizeof(*buffer))
+ buf_sz = sizeof(*buffer);
+ } else {
+ /* FFA_VERSION_1_0 lacks size in the response */
+ buf_sz = sz = 8;
+ }
+
+ if (buffer && count <= num_partitions)
+ for (idx = 0; idx < count; idx++)
+ memcpy(buffer + idx, drv_info->rx_buffer + idx * sz,
+ buf_sz);
+
+ ffa_rx_release();
+
+ mutex_unlock(&drv_info->rx_lock);
+
+ return count;
+}
+
+/* buffer is allocated and caller must free the same if returned count > 0 */
+static int
+ffa_partition_probe(const uuid_t *uuid, struct ffa_partition_info **buffer)
+{
+ int count;
+ u32 uuid0_4[4];
+ struct ffa_partition_info *pbuf;
+
+ export_uuid((u8 *)uuid0_4, uuid);
+ count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2],
+ uuid0_4[3], NULL, 0);
+ if (count <= 0)
+ return count;
+
+ pbuf = kcalloc(count, sizeof(*pbuf), GFP_KERNEL);
+ if (!pbuf)
+ return -ENOMEM;
+
+ count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2],
+ uuid0_4[3], pbuf, count);
+ if (count <= 0)
+ kfree(pbuf);
+ else
+ *buffer = pbuf;
+
+ return count;
+}
+
+#define VM_ID_MASK GENMASK(15, 0)
+static int ffa_id_get(u16 *vm_id)
+{
+ ffa_value_t id;
+
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_ID_GET,
+ }, &id);
+
+ if (id.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)id.a2);
+
+ *vm_id = FIELD_GET(VM_ID_MASK, (id.a2));
+
+ return 0;
+}
+
+static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit,
+ struct ffa_send_direct_data *data)
+{
+ u32 req_id, resp_id, src_dst_ids = PACK_TARGET_INFO(src_id, dst_id);
+ ffa_value_t ret;
+
+ if (mode_32bit) {
+ req_id = FFA_MSG_SEND_DIRECT_REQ;
+ resp_id = FFA_MSG_SEND_DIRECT_RESP;
+ } else {
+ req_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_REQ);
+ resp_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_RESP);
+ }
+
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = req_id, .a1 = src_dst_ids, .a2 = 0,
+ .a3 = data->data0, .a4 = data->data1, .a5 = data->data2,
+ .a6 = data->data3, .a7 = data->data4,
+ }, &ret);
+
+ while (ret.a0 == FFA_INTERRUPT)
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_RUN, .a1 = ret.a1,
+ }, &ret);
+
+ if (ret.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)ret.a2);
+
+ if (ret.a0 == resp_id) {
+ data->data0 = ret.a3;
+ data->data1 = ret.a4;
+ data->data2 = ret.a5;
+ data->data3 = ret.a6;
+ data->data4 = ret.a7;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz,
+ u32 frag_len, u32 len, u64 *handle)
+{
+ ffa_value_t ret;
+
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = func_id, .a1 = len, .a2 = frag_len,
+ .a3 = buf, .a4 = buf_sz,
+ }, &ret);
+
+ while (ret.a0 == FFA_MEM_OP_PAUSE)
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_MEM_OP_RESUME,
+ .a1 = ret.a1, .a2 = ret.a2,
+ }, &ret);
+
+ if (ret.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)ret.a2);
+
+ if (ret.a0 == FFA_SUCCESS) {
+ if (handle)
+ *handle = PACK_HANDLE(ret.a2, ret.a3);
+ } else if (ret.a0 == FFA_MEM_FRAG_RX) {
+ if (handle)
+ *handle = PACK_HANDLE(ret.a1, ret.a2);
+ } else {
+ return -EOPNOTSUPP;
+ }
+
+ return frag_len;
+}
+
+static int ffa_mem_next_frag(u64 handle, u32 frag_len)
+{
+ ffa_value_t ret;
+
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_MEM_FRAG_TX,
+ .a1 = HANDLE_LOW(handle), .a2 = HANDLE_HIGH(handle),
+ .a3 = frag_len,
+ }, &ret);
+
+ while (ret.a0 == FFA_MEM_OP_PAUSE)
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_MEM_OP_RESUME,
+ .a1 = ret.a1, .a2 = ret.a2,
+ }, &ret);
+
+ if (ret.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)ret.a2);
+
+ if (ret.a0 == FFA_MEM_FRAG_RX)
+ return ret.a3;
+ else if (ret.a0 == FFA_SUCCESS)
+ return 0;
+
+ return -EOPNOTSUPP;
+}
+
+static int
+ffa_transmit_fragment(u32 func_id, phys_addr_t buf, u32 buf_sz, u32 frag_len,
+ u32 len, u64 *handle, bool first)
+{
+ if (!first)
+ return ffa_mem_next_frag(*handle, frag_len);
+
+ return ffa_mem_first_frag(func_id, buf, buf_sz, frag_len, len, handle);
+}
+
+static u32 ffa_get_num_pages_sg(struct scatterlist *sg)
+{
+ u32 num_pages = 0;
+
+ do {
+ num_pages += sg->length / FFA_PAGE_SIZE;
+ } while ((sg = sg_next(sg)));
+
+ return num_pages;
+}
+
+static u8 ffa_memory_attributes_get(u32 func_id)
+{
+ /*
+ * For the memory lend or donate operation, if the receiver is a PE or
+ * a proxy endpoint, the owner/sender must not specify the attributes
+ */
+ if (func_id == FFA_FN_NATIVE(MEM_LEND) ||
+ func_id == FFA_MEM_LEND)
+ return 0;
+
+ return FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK | FFA_MEM_INNER_SHAREABLE;
+}
+
+static int
+ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize,
+ struct ffa_mem_ops_args *args)
+{
+ int rc = 0;
+ bool first = true;
+ phys_addr_t addr = 0;
+ struct ffa_composite_mem_region *composite;
+ struct ffa_mem_region_addr_range *constituents;
+ struct ffa_mem_region_attributes *ep_mem_access;
+ struct ffa_mem_region *mem_region = buffer;
+ u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg);
+
+ mem_region->tag = args->tag;
+ mem_region->flags = args->flags;
+ mem_region->sender_id = drv_info->vm_id;
+ mem_region->attributes = ffa_memory_attributes_get(func_id);
+ ep_mem_access = &mem_region->ep_mem_access[0];
+
+ for (idx = 0; idx < args->nattrs; idx++, ep_mem_access++) {
+ ep_mem_access->receiver = args->attrs[idx].receiver;
+ ep_mem_access->attrs = args->attrs[idx].attrs;
+ ep_mem_access->composite_off = COMPOSITE_OFFSET(args->nattrs);
+ ep_mem_access->flag = 0;
+ ep_mem_access->reserved = 0;
+ }
+ mem_region->handle = 0;
+ mem_region->reserved_0 = 0;
+ mem_region->reserved_1 = 0;
+ mem_region->ep_count = args->nattrs;
+
+ composite = buffer + COMPOSITE_OFFSET(args->nattrs);
+ composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg);
+ composite->addr_range_cnt = num_entries;
+ composite->reserved = 0;
+
+ length = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, num_entries);
+ frag_len = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, 0);
+ if (frag_len > max_fragsize)
+ return -ENXIO;
+
+ if (!args->use_txbuf) {
+ addr = virt_to_phys(buffer);
+ buf_sz = max_fragsize / FFA_PAGE_SIZE;
+ }
+
+ constituents = buffer + frag_len;
+ idx = 0;
+ do {
+ if (frag_len == max_fragsize) {
+ rc = ffa_transmit_fragment(func_id, addr, buf_sz,
+ frag_len, length,
+ &args->g_handle, first);
+ if (rc < 0)
+ return -ENXIO;
+
+ first = false;
+ idx = 0;
+ frag_len = 0;
+ constituents = buffer;
+ }
+
+ if ((void *)constituents - buffer > max_fragsize) {
+ pr_err("Memory Region Fragment > Tx Buffer size\n");
+ return -EFAULT;
+ }
+
+ constituents->address = sg_phys(args->sg);
+ constituents->pg_cnt = args->sg->length / FFA_PAGE_SIZE;
+ constituents->reserved = 0;
+ constituents++;
+ frag_len += sizeof(struct ffa_mem_region_addr_range);
+ } while ((args->sg = sg_next(args->sg)));
+
+ return ffa_transmit_fragment(func_id, addr, buf_sz, frag_len,
+ length, &args->g_handle, first);
+}
+
+static int ffa_memory_ops(u32 func_id, struct ffa_mem_ops_args *args)
+{
+ int ret;
+ void *buffer;
+
+ if (!args->use_txbuf) {
+ buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+ } else {
+ buffer = drv_info->tx_buffer;
+ mutex_lock(&drv_info->tx_lock);
+ }
+
+ ret = ffa_setup_and_transmit(func_id, buffer, RXTX_BUFFER_SIZE, args);
+
+ if (args->use_txbuf)
+ mutex_unlock(&drv_info->tx_lock);
+ else
+ free_pages_exact(buffer, RXTX_BUFFER_SIZE);
+
+ return ret < 0 ? ret : 0;
+}
+
+static int ffa_memory_reclaim(u64 g_handle, u32 flags)
+{
+ ffa_value_t ret;
+
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_MEM_RECLAIM,
+ .a1 = HANDLE_LOW(g_handle), .a2 = HANDLE_HIGH(g_handle),
+ .a3 = flags,
+ }, &ret);
+
+ if (ret.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)ret.a2);
+
+ return 0;
+}
+
+static int ffa_features(u32 func_feat_id, u32 input_props,
+ u32 *if_props_1, u32 *if_props_2)
+{
+ ffa_value_t id;
+
+ if (!ARM_SMCCC_IS_FAST_CALL(func_feat_id) && input_props) {
+ pr_err("%s: Invalid Parameters: %x, %x", __func__,
+ func_feat_id, input_props);
+ return ffa_to_linux_errno(FFA_RET_INVALID_PARAMETERS);
+ }
+
+ invoke_ffa_fn((ffa_value_t){
+ .a0 = FFA_FEATURES, .a1 = func_feat_id, .a2 = input_props,
+ }, &id);
+
+ if (id.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)id.a2);
+
+ if (if_props_1)
+ *if_props_1 = id.a2;
+ if (if_props_2)
+ *if_props_2 = id.a3;
+
+ return 0;
+}
+
+static void ffa_set_up_mem_ops_native_flag(void)
+{
+ if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) ||
+ !ffa_features(FFA_FN_NATIVE(MEM_SHARE), 0, NULL, NULL))
+ drv_info->mem_ops_native = true;
+}
+
+static u32 ffa_api_version_get(void)
+{
+ return drv_info->version;
+}
+
+static int ffa_partition_info_get(const char *uuid_str,
+ struct ffa_partition_info *buffer)
+{
+ int count;
+ uuid_t uuid;
+ struct ffa_partition_info *pbuf;
+
+ if (uuid_parse(uuid_str, &uuid)) {
+ pr_err("invalid uuid (%s)\n", uuid_str);
+ return -ENODEV;
+ }
+
+ count = ffa_partition_probe(&uuid, &pbuf);
+ if (count <= 0)
+ return -ENOENT;
+
+ memcpy(buffer, pbuf, sizeof(*pbuf) * count);
+ kfree(pbuf);
+ return 0;
+}
+
+static void ffa_mode_32bit_set(struct ffa_device *dev)
+{
+ dev->mode_32bit = true;
+}
+
+static int ffa_sync_send_receive(struct ffa_device *dev,
+ struct ffa_send_direct_data *data)
+{
+ return ffa_msg_send_direct_req(drv_info->vm_id, dev->vm_id,
+ dev->mode_32bit, data);
+}
+
+static int ffa_memory_share(struct ffa_mem_ops_args *args)
+{
+ if (drv_info->mem_ops_native)
+ return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args);
+
+ return ffa_memory_ops(FFA_MEM_SHARE, args);
+}
+
+static int ffa_memory_lend(struct ffa_mem_ops_args *args)
+{
+ /* Note that upon a successful MEM_LEND request the caller
+ * must ensure that the memory region specified is not accessed
+ * until a successful MEM_RECALIM call has been made.
+ * On systems with a hypervisor present this will been enforced,
+ * however on systems without a hypervisor the responsibility
+ * falls to the calling kernel driver to prevent access.
+ */
+ if (drv_info->mem_ops_native)
+ return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args);
+
+ return ffa_memory_ops(FFA_MEM_LEND, args);
+}
+
+static const struct ffa_info_ops ffa_drv_info_ops = {
+ .api_version_get = ffa_api_version_get,
+ .partition_info_get = ffa_partition_info_get,
+};
+
+static const struct ffa_msg_ops ffa_drv_msg_ops = {
+ .mode_32bit_set = ffa_mode_32bit_set,
+ .sync_send_receive = ffa_sync_send_receive,
+};
+
+static const struct ffa_mem_ops ffa_drv_mem_ops = {
+ .memory_reclaim = ffa_memory_reclaim,
+ .memory_share = ffa_memory_share,
+ .memory_lend = ffa_memory_lend,
+};
+
+static const struct ffa_ops ffa_drv_ops = {
+ .info_ops = &ffa_drv_info_ops,
+ .msg_ops = &ffa_drv_msg_ops,
+ .mem_ops = &ffa_drv_mem_ops,
+};
+
+void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
+{
+ int count, idx;
+ struct ffa_partition_info *pbuf, *tpbuf;
+
+ /*
+ * FF-A v1.1 provides UUID for each partition as part of the discovery
+ * API, the discovered UUID must be populated in the device's UUID and
+ * there is no need to copy the same from the driver table.
+ */
+ if (drv_info->version > FFA_VERSION_1_0)
+ return;
+
+ count = ffa_partition_probe(uuid, &pbuf);
+ if (count <= 0)
+ return;
+
+ for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++)
+ if (tpbuf->id == ffa_dev->vm_id)
+ uuid_copy(&ffa_dev->uuid, uuid);
+ kfree(pbuf);
+}
+
+static void ffa_setup_partitions(void)
+{
+ int count, idx;
+ uuid_t uuid;
+ struct ffa_device *ffa_dev;
+ struct ffa_partition_info *pbuf, *tpbuf;
+
+ count = ffa_partition_probe(&uuid_null, &pbuf);
+ if (count <= 0) {
+ pr_info("%s: No partitions found, error %d\n", __func__, count);
+ return;
+ }
+
+ for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) {
+ import_uuid(&uuid, (u8 *)tpbuf->uuid);
+
+ /* Note that if the UUID will be uuid_null, that will require
+ * ffa_device_match() to find the UUID of this partition id
+ * with help of ffa_device_match_uuid(). FF-A v1.1 and above
+ * provides UUID here for each partition as part of the
+ * discovery API and the same is passed.
+ */
+ ffa_dev = ffa_device_register(&uuid, tpbuf->id, &ffa_drv_ops);
+ if (!ffa_dev) {
+ pr_err("%s: failed to register partition ID 0x%x\n",
+ __func__, tpbuf->id);
+ continue;
+ }
+
+ if (drv_info->version > FFA_VERSION_1_0 &&
+ !(tpbuf->properties & FFA_PARTITION_AARCH64_EXEC))
+ ffa_mode_32bit_set(ffa_dev);
+ }
+ kfree(pbuf);
+}
+
+static int __init ffa_init(void)
+{
+ int ret;
+
+ ret = ffa_transport_init(&invoke_ffa_fn);
+ if (ret)
+ return ret;
+
+ ret = arm_ffa_bus_init();
+ if (ret)
+ return ret;
+
+ drv_info = kzalloc(sizeof(*drv_info), GFP_KERNEL);
+ if (!drv_info) {
+ ret = -ENOMEM;
+ goto ffa_bus_exit;
+ }
+
+ ret = ffa_version_check(&drv_info->version);
+ if (ret)
+ goto free_drv_info;
+
+ if (ffa_id_get(&drv_info->vm_id)) {
+ pr_err("failed to obtain VM id for self\n");
+ ret = -ENODEV;
+ goto free_drv_info;
+ }
+
+ drv_info->rx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
+ if (!drv_info->rx_buffer) {
+ ret = -ENOMEM;
+ goto free_pages;
+ }
+
+ drv_info->tx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
+ if (!drv_info->tx_buffer) {
+ ret = -ENOMEM;
+ goto free_pages;
+ }
+
+ ret = ffa_rxtx_map(virt_to_phys(drv_info->tx_buffer),
+ virt_to_phys(drv_info->rx_buffer),
+ RXTX_BUFFER_SIZE / FFA_PAGE_SIZE);
+ if (ret) {
+ pr_err("failed to register FFA RxTx buffers\n");
+ goto free_pages;
+ }
+
+ mutex_init(&drv_info->rx_lock);
+ mutex_init(&drv_info->tx_lock);
+
+ ffa_setup_partitions();
+
+ ffa_set_up_mem_ops_native_flag();
+
+ return 0;
+free_pages:
+ if (drv_info->tx_buffer)
+ free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE);
+ free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE);
+free_drv_info:
+ kfree(drv_info);
+ffa_bus_exit:
+ arm_ffa_bus_exit();
+ return ret;
+}
+subsys_initcall(ffa_init);
+
+static void __exit ffa_exit(void)
+{
+ ffa_rxtx_unmap(drv_info->vm_id);
+ free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE);
+ free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE);
+ kfree(drv_info);
+ arm_ffa_bus_exit();
+}
+module_exit(ffa_exit);
+
+MODULE_ALIAS("arm-ffa");
+MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
+MODULE_DESCRIPTION("Arm FF-A interface driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/firmware/arm_ffa/smccc.c b/drivers/firmware/arm_ffa/smccc.c
new file mode 100644
index 0000000000..4d85bfff0a
--- /dev/null
+++ b/drivers/firmware/arm_ffa/smccc.c
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2021 ARM Ltd.
+ */
+
+#include <linux/printk.h>
+
+#include "common.h"
+
+static void __arm_ffa_fn_smc(ffa_value_t args, ffa_value_t *res)
+{
+ arm_smccc_1_2_smc(&args, res);
+}
+
+static void __arm_ffa_fn_hvc(ffa_value_t args, ffa_value_t *res)
+{
+ arm_smccc_1_2_hvc(&args, res);
+}
+
+int __init ffa_transport_init(ffa_fn **invoke_ffa_fn)
+{
+ enum arm_smccc_conduit conduit;
+
+ if (arm_smccc_get_version() < ARM_SMCCC_VERSION_1_2)
+ return -EOPNOTSUPP;
+
+ conduit = arm_smccc_1_1_get_conduit();
+ if (conduit == SMCCC_CONDUIT_NONE) {
+ pr_err("%s: invalid SMCCC conduit\n", __func__);
+ return -EOPNOTSUPP;
+ }
+
+ if (conduit == SMCCC_CONDUIT_SMC)
+ *invoke_ffa_fn = __arm_ffa_fn_smc;
+ else
+ *invoke_ffa_fn = __arm_ffa_fn_hvc;
+
+ return 0;
+}