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path: root/drivers/firmware/arm_ffa/driver.c
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Diffstat (limited to 'drivers/firmware/arm_ffa/driver.c')
-rw-r--r--drivers/firmware/arm_ffa/driver.c731
1 files changed, 731 insertions, 0 deletions
diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
new file mode 100644
index 000000000000..b1edb4b2e94a
--- /dev/null
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -0,0 +1,731 @@
+// 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_SMC(calling_convention, func_num) \
+ ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, (calling_convention), \
+ ARM_SMCCC_OWNER_STANDARD, (func_num))
+
+#define FFA_SMC_32(func_num) FFA_SMC(ARM_SMCCC_SMC_32, (func_num))
+#define FFA_SMC_64(func_num) FFA_SMC(ARM_SMCCC_SMC_64, (func_num))
+
+#define FFA_ERROR FFA_SMC_32(0x60)
+#define FFA_SUCCESS FFA_SMC_32(0x61)
+#define FFA_INTERRUPT FFA_SMC_32(0x62)
+#define FFA_VERSION FFA_SMC_32(0x63)
+#define FFA_FEATURES FFA_SMC_32(0x64)
+#define FFA_RX_RELEASE FFA_SMC_32(0x65)
+#define FFA_RXTX_MAP FFA_SMC_32(0x66)
+#define FFA_FN64_RXTX_MAP FFA_SMC_64(0x66)
+#define FFA_RXTX_UNMAP FFA_SMC_32(0x67)
+#define FFA_PARTITION_INFO_GET FFA_SMC_32(0x68)
+#define FFA_ID_GET FFA_SMC_32(0x69)
+#define FFA_MSG_POLL FFA_SMC_32(0x6A)
+#define FFA_MSG_WAIT FFA_SMC_32(0x6B)
+#define FFA_YIELD FFA_SMC_32(0x6C)
+#define FFA_RUN FFA_SMC_32(0x6D)
+#define FFA_MSG_SEND FFA_SMC_32(0x6E)
+#define FFA_MSG_SEND_DIRECT_REQ FFA_SMC_32(0x6F)
+#define FFA_FN64_MSG_SEND_DIRECT_REQ FFA_SMC_64(0x6F)
+#define FFA_MSG_SEND_DIRECT_RESP FFA_SMC_32(0x70)
+#define FFA_FN64_MSG_SEND_DIRECT_RESP FFA_SMC_64(0x70)
+#define FFA_MEM_DONATE FFA_SMC_32(0x71)
+#define FFA_FN64_MEM_DONATE FFA_SMC_64(0x71)
+#define FFA_MEM_LEND FFA_SMC_32(0x72)
+#define FFA_FN64_MEM_LEND FFA_SMC_64(0x72)
+#define FFA_MEM_SHARE FFA_SMC_32(0x73)
+#define FFA_FN64_MEM_SHARE FFA_SMC_64(0x73)
+#define FFA_MEM_RETRIEVE_REQ FFA_SMC_32(0x74)
+#define FFA_FN64_MEM_RETRIEVE_REQ FFA_SMC_64(0x74)
+#define FFA_MEM_RETRIEVE_RESP FFA_SMC_32(0x75)
+#define FFA_MEM_RELINQUISH FFA_SMC_32(0x76)
+#define FFA_MEM_RECLAIM FFA_SMC_32(0x77)
+#define FFA_MEM_OP_PAUSE FFA_SMC_32(0x78)
+#define FFA_MEM_OP_RESUME FFA_SMC_32(0x79)
+#define FFA_MEM_FRAG_RX FFA_SMC_32(0x7A)
+#define FFA_MEM_FRAG_TX FFA_SMC_32(0x7B)
+#define FFA_NORMAL_WORLD_RESUME FFA_SMC_32(0x7C)
+
+/*
+ * For some calls it is necessary to use SMC64 to pass or return 64-bit values.
+ * For such calls FFA_FN_NATIVE(name) will choose the appropriate
+ * (native-width) function ID.
+ */
+#ifdef CONFIG_64BIT
+#define FFA_FN_NATIVE(name) FFA_FN64_##name
+#else
+#define FFA_FN_NATIVE(name) FFA_##name
+#endif
+
+/* FFA error codes. */
+#define FFA_RET_SUCCESS (0)
+#define FFA_RET_NOT_SUPPORTED (-1)
+#define FFA_RET_INVALID_PARAMETERS (-2)
+#define FFA_RET_NO_MEMORY (-3)
+#define FFA_RET_BUSY (-4)
+#define FFA_RET_INTERRUPTED (-5)
+#define FFA_RET_DENIED (-6)
+#define FFA_RET_RETRY (-7)
+#define FFA_RET_ABORTED (-8)
+
+#define MAJOR_VERSION_MASK GENMASK(30, 16)
+#define MINOR_VERSION_MASK GENMASK(15, 0)
+#define MAJOR_VERSION(x) ((u16)(FIELD_GET(MAJOR_VERSION_MASK, (x))))
+#define MINOR_VERSION(x) ((u16)(FIELD_GET(MINOR_VERSION_MASK, (x))))
+#define PACK_VERSION_INFO(major, minor) \
+ (FIELD_PREP(MAJOR_VERSION_MASK, (major)) | \
+ FIELD_PREP(MINOR_VERSION_MASK, (minor)))
+#define FFA_VERSION_1_0 PACK_VERSION_INFO(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)))
+
+/**
+ * FF-A specification mentions explicitly about '4K pages'. This should
+ * not be confused with the kernel PAGE_SIZE, which is the translation
+ * granule kernel is configured and may be one among 4K, 16K and 64K.
+ */
+#define FFA_PAGE_SIZE SZ_4K
+/*
+ * 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)
+{
+ if (errno < FFA_RET_SUCCESS && errno >= -ARRAY_SIZE(ffa_linux_errmap))
+ return ffa_linux_errmap[-errno];
+ 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;
+};
+
+static struct ffa_drv_info *drv_info;
+
+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 || ver.a0 > FFA_DRIVER_VERSION) {
+ pr_err("Incompatible version %d.%d found\n",
+ MAJOR_VERSION(ver.a0), MINOR_VERSION(ver.a0));
+ return -EINVAL;
+ }
+
+ *version = ver.a0;
+ pr_info("Version %d.%d found\n", MAJOR_VERSION(ver.a0),
+ MINOR_VERSION(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;
+}
+
+/* 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 count;
+ ffa_value_t partition_info;
+
+ 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,
+ }, &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 (buffer && count <= num_partitions)
+ memcpy(buffer, drv_info->rx_buffer, sizeof(*buffer) * count);
+
+ 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)
+ return -EOPNOTSUPP;
+
+ if (handle)
+ *handle = PACK_HANDLE(ret.a2, ret.a3);
+
+ 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 -EOPNOTSUPP;
+
+ return ret.a3;
+}
+
+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 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_MEM_NORMAL | FFA_MEM_WRITE_BACK |
+ FFA_MEM_INNER_SHAREABLE;
+ 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);
+ }
+ 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;
+
+ 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++;
+ 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 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_null, &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_device *dev, struct ffa_mem_ops_args *args)
+{
+ if (dev->mode_32bit)
+ return ffa_memory_ops(FFA_MEM_SHARE, args);
+
+ return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args);
+}
+
+static const struct ffa_dev_ops ffa_ops = {
+ .api_version_get = ffa_api_version_get,
+ .partition_info_get = ffa_partition_info_get,
+ .mode_32bit_set = ffa_mode_32bit_set,
+ .sync_send_receive = ffa_sync_send_receive,
+ .memory_reclaim = ffa_memory_reclaim,
+ .memory_share = ffa_memory_share,
+};
+
+const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev)
+{
+ if (ffa_device_is_valid(dev))
+ return &ffa_ops;
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(ffa_dev_ops_get);
+
+void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
+{
+ int count, idx;
+ struct ffa_partition_info *pbuf, *tpbuf;
+
+ 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;
+ 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++) {
+ /* Note that the &uuid_null parameter will require
+ * ffa_device_match() to find the UUID of this partition id
+ * with help of ffa_device_match_uuid(). Once the FF-A spec
+ * is updated to provide correct UUID here for each partition
+ * as part of the discovery API, we need to pass the
+ * discovered UUID here instead.
+ */
+ ffa_dev = ffa_device_register(&uuid_null, tpbuf->id);
+ if (!ffa_dev) {
+ pr_err("%s: failed to register partition ID 0x%x\n",
+ __func__, tpbuf->id);
+ continue;
+ }
+
+ ffa_dev_set_drvdata(ffa_dev, drv_info);
+ }
+ 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();
+
+ 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");
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