// 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/acpi.h>
#include <linux/arm_ffa.h>
#include <linux/bitfield.h>
#include <linux/cpuhotplug.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/hashtable.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/minmax.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/uuid.h>
#include <linux/xarray.h>
#include <asm/virt.h>
#include "common.h"
#define FFA_DRIVER_VERSION FFA_VERSION_1_2
#define FFA_MIN_VERSION FFA_VERSION_1_0
#define FFA_PLATFORM_NAME "arm-ffa"
#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)))
#define RXTX_MAP_MIN_BUFSZ_MASK GENMASK(1, 0)
#define RXTX_MAP_MAX_BUFSZ_MASK GENMASK(31, 16)
#define RXTX_MAP_MIN_BUFSZ(x) (FIELD_GET(RXTX_MAP_MIN_BUFSZ_MASK, (x)))
#define RXTX_MAP_MAX_BUFSZ(x) (FIELD_GET(RXTX_MAP_MAX_BUFSZ_MASK, (x)))
#define FFA_MAX_NOTIFICATIONS 64
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 */
-ENODATA, /* FFA_RET_NO_DATA */
-EAGAIN, /* FFA_RET_NOT_READY */
};
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_pcpu_irq {
struct ffa_drv_info *info;
struct work_struct notif_pcpu_work;
};
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;
size_t rxtx_bufsz;
bool mem_ops_native;
bool msg_direct_req2_supp;
bool bitmap_created;
bool bus_notifier_registered;
bool notif_enabled;
unsigned int sched_recv_irq;
unsigned int notif_pend_irq;
unsigned int cpuhp_state;
struct ffa_pcpu_irq __percpu *irq_pcpu;
struct workqueue_struct *notif_pcpu_wq;
struct work_struct sched_recv_irq_work;
struct xarray partition_info;
DECLARE_HASHTABLE(notifier_hash, ilog2(FFA_MAX_NOTIFICATIONS));
rwlock_t notify_lock; /* lock to protect notifier hashtable */
};
static struct ffa_drv_info *drv_info;
static struct platform_device *ffa_pdev;
/*
* 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 ((s32)ver.a0 == FFA_RET_NOT_SUPPORTED) {
pr_info("FFA_VERSION returned not supported\n");
return -EOPNOTSUPP;
}
if (FFA_MAJOR_VERSION(ver.a0) > FFA_MAJOR_VERSION(FFA_DRIVER_VERSION)) {
pr_err("Incompatible v%d.%d! Latest supported v%d.%d\n",
FFA_MAJOR_VERSION(ver.a0), FFA_MINOR_VERSION(ver.a0),
FFA_MAJOR_VERSION(FFA_DRIVER_VERSION),
FFA_MINOR_VERSION(FFA_DRIVER_VERSION));
return -EINVAL;
}
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(void)
{
ffa_value_t ret;
invoke_ffa_fn((ffa_value_t){
.a0 = FFA_RXTX_UNMAP,
}, &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;
}
#define PARTITION_INFO_GET_RETURN_COUNT_ONLY BIT(0)
#define FFA_SUPPORTS_GET_COUNT_ONLY(version) ((version) > FFA_VERSION_1_0)
#define FFA_PART_INFO_HAS_SIZE_IN_RESP(version) ((version) > FFA_VERSION_1_0)
#define FFA_PART_INFO_HAS_UUID_IN_RESP(version) ((version) > FFA_VERSION_1_0)
#define FFA_PART_INFO_HAS_EXEC_STATE_IN_RESP(version) \
((version) > FFA_VERSION_1_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 (FFA_SUPPORTS_GET_COUNT_ONLY(drv_info->version) &&
(!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 (FFA_PART_INFO_HAS_SIZE_IN_RESP(drv_info->version)) {
buf_sz = sz = partition_info.a3;
if (sz > sizeof(*buffer))
buf_sz = sizeof(*buffer);
} else {
buf_sz = sz = 8;
}
if (buffer && count <= num_partitions)
for (idx = 0; idx < count; idx++) {
struct ffa_partition_info_le {
__le16 id;
__le16 exec_ctxt;
__le32 properties;
uuid_t uuid;
} *rx_buf = drv_info->rx_buffer + idx * sz;
struct ffa_partition_info *buf = buffer + idx;
buf->id = le16_to_cpu(rx_buf->id);
buf->exec_ctxt = le16_to_cpu(rx_buf->exec_ctxt);
buf->properties = le32_to_cpu(rx_buf->properties);
if (buf_sz > 8)
import_uuid(&buf->uuid, (u8 *)&rx_buf->uuid);
}
if (!(flags & PARTITION_INFO_GET_RETURN_COUNT_ONLY))
ffa_rx_release();
mutex_unlock(&drv_info->rx_lock);
return count;
}
#define LAST_INDEX_MASK GENMASK(15, 0)
#define CURRENT_INDEX_MASK GENMASK(31, 16)
#define UUID_INFO_TAG_MASK GENMASK(47, 32)
#define PARTITION_INFO_SZ_MASK GENMASK(63, 48)
#define PARTITION_COUNT(x) ((u16)(FIELD_GET(LAST_INDEX_MASK, (x))) + 1)
#define CURRENT_INDEX(x) ((u16)(FIELD_GET(CURRENT_INDEX_MASK, (x))))
#define UUID_INFO_TAG(x) ((u16)(FIELD_GET(UUID_INFO_TAG_MASK, (x))))
#define PARTITION_INFO_SZ(x) ((u16)(FIELD_GET(PARTITION_INFO_SZ_MASK, (x))))
#define PART_INFO_ID_MASK GENMASK(15, 0)
#define PART_INFO_EXEC_CXT_MASK GENMASK(31, 16)
#define PART_INFO_PROPS_MASK GENMASK(63, 32)
#define FFA_PART_INFO_GET_REGS_FIRST_REG 3
#define FFA_PART_INFO_GET_REGS_MIN_REGS_PER_DESC 3
#define FFA_PART_INFO_GET_REGS_NUM_REGS \
(sizeof(ffa_value_t) / sizeof_field(ffa_value_t, a0))
#define PART_INFO_ID(x) ((u16)(FIELD_GET(PART_INFO_ID_MASK, (x))))
#define PART_INFO_EXEC_CXT(x) ((u16)(FIELD_GET(PART_INFO_EXEC_CXT_MASK, (x))))
#define PART_INFO_PROPERTIES(x) ((u32)(FIELD_GET(PART_INFO_PROPS_MASK, (x))))
static int
__ffa_partition_info_get_regs(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
struct ffa_partition_info *buffer, int num_parts)
{
u16 buf_sz, start_idx = 0, cur_idx, count = 0, tag = 0;
struct ffa_partition_info *buf = buffer;
ffa_value_t partition_info;
do {
__le64 *regs;
int idx, nr_desc, buf_idx, regs_per_desc, max_desc;
invoke_ffa_fn((ffa_value_t){
.a0 = FFA_PARTITION_INFO_GET_REGS,
.a1 = (u64)uuid1 << 32 | uuid0,
.a2 = (u64)uuid3 << 32 | uuid2,
.a3 = start_idx | tag << 16,
}, &partition_info);
if (partition_info.a0 == FFA_ERROR)
return ffa_to_linux_errno((int)partition_info.a2);
if (!count)
count = PARTITION_COUNT(partition_info.a2);
if (!buffer || !num_parts) /* count only */
return count;
if (count > num_parts)
return -EINVAL;
cur_idx = CURRENT_INDEX(partition_info.a2);
if (cur_idx < start_idx || cur_idx >= count)
return -EINVAL;
buf_sz = PARTITION_INFO_SZ(partition_info.a2);
if (buf_sz % sizeof(*regs))
return -EINVAL;
regs_per_desc = buf_sz / sizeof(*regs);
if (regs_per_desc < FFA_PART_INFO_GET_REGS_MIN_REGS_PER_DESC)
return -EINVAL;
nr_desc = cur_idx - start_idx + 1;
max_desc = (FFA_PART_INFO_GET_REGS_NUM_REGS -
FFA_PART_INFO_GET_REGS_FIRST_REG) / regs_per_desc;
if (nr_desc > max_desc)
return -EINVAL;
buf_idx = buf - buffer;
if (buf_idx + nr_desc > num_parts)
return -EINVAL;
tag = UUID_INFO_TAG(partition_info.a2);
regs = (void *)&partition_info.a3;
for (idx = 0; idx < nr_desc; idx++, buf++) {
union {
uuid_t uuid;
u64 regs[2];
} uuid_regs = {
.regs = {
le64_to_cpu(*(regs + 1)),
le64_to_cpu(*(regs + 2)),
}
};
u64 val = *(u64 *)regs;
buf->id = PART_INFO_ID(val);
buf->exec_ctxt = PART_INFO_EXEC_CXT(val);
buf->properties = PART_INFO_PROPERTIES(val);
uuid_copy(&buf->uuid, &uuid_regs.uuid);
regs += regs_per_desc;
}
start_idx = cur_idx + 1;
} while (cur_idx < (count - 1));
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];
bool reg_mode = false;
struct ffa_partition_info *pbuf;
if (!ffa_features(FFA_PARTITION_INFO_GET_REGS, 0, NULL, NULL))
reg_mode = true;
export_uuid((u8 *)uuid0_4, uuid);
if (reg_mode)
count = __ffa_partition_info_get_regs(uuid0_4[0], uuid0_4[1],
uuid0_4[2], uuid0_4[3],
NULL, 0);
else
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 = kzalloc_objs(*pbuf, count);
if (!pbuf)
return -ENOMEM;
if (reg_mode)
count = __ffa_partition_info_get_regs(uuid0_4[0], uuid0_4[1],
uuid0_4[2], uuid0_4[3],
pbuf, count);
else
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 inline void ffa_msg_send_wait_for_completion(ffa_value_t *ret)
{
while (ret->a0 == FFA_INTERRUPT || ret->a0 == FFA_YIELD) {
if (ret->a0 == FFA_YIELD)
fsleep(1000);
invoke_ffa_fn((ffa_value_t){
.a0 = FFA_RUN, .a1 = ret->a1,
}, ret);
}
}
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);
ffa_msg_send_wait_for_completion(&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_msg_send2(struct ffa_device *dev, u16 src_id, void *buf, size_t sz)
{
u32 src_dst_ids = PACK_TARGET_INFO(src_id, dev->vm_id);
struct ffa_indirect_msg_hdr *msg;
ffa_value_t ret;
int retval = 0;
if (sz > (drv_info->rxtx_bufsz - sizeof(*msg)))
return -ERANGE;
mutex_lock(&drv_info->tx_lock);
msg = drv_info->tx_buffer;
msg->flags = 0;
msg->res0 = 0;
msg->offset = sizeof(*msg);
msg->send_recv_id = src_dst_ids;
msg->size = sz;
uuid_copy(&msg->uuid, &dev->uuid);
memcpy((u8 *)msg + msg->offset, buf, sz);
/* flags = 0, sender VMID = 0 works for both physical/virtual NS */
invoke_ffa_fn((ffa_value_t){
.a0 = FFA_MSG_SEND2, .a1 = 0, .a2 = 0
}, &ret);
if (ret.a0 == FFA_ERROR)
retval = ffa_to_linux_errno((int)ret.a2);
mutex_unlock(&drv_info->tx_lock);
return retval;
}
static int ffa_msg_send_direct_req2(u16 src_id, u16 dst_id, const uuid_t *uuid,
struct ffa_send_direct_data2 *data)
{
u32 src_dst_ids = PACK_TARGET_INFO(src_id, dst_id);
union {
uuid_t uuid;
__le64 regs[2];
} uuid_regs = { .uuid = *uuid };
ffa_value_t ret, args = {
.a0 = FFA_MSG_SEND_DIRECT_REQ2,
.a1 = src_dst_ids,
.a2 = le64_to_cpu(uuid_regs.regs[0]),
.a3 = le64_to_cpu(uuid_regs.regs[1]),
};
memcpy((void *)&args + offsetof(ffa_value_t, a4), data, sizeof(*data));
invoke_ffa_fn(args, &ret);
ffa_msg_send_wait_for_completion(&ret);
if (ret.a0 == FFA_ERROR)
return ffa_to_linux_errno((int)ret.a2);
if (ret.a0 == FFA_MSG_SEND_DIRECT_RESP2) {
memcpy(data, (void *)&ret + offsetof(ffa_value_t, a4), sizeof(*data));
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 u16 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 void ffa_emad_impdef_value_init(u32 version, void *dst, void *src)
{
struct ffa_mem_region_attributes *ep_mem_access;
if (FFA_EMAD_HAS_IMPDEF_FIELD(version))
memcpy(dst, src, sizeof(ep_mem_access->impdef_val));
}
static void
ffa_mem_region_additional_setup(u32 version, struct ffa_mem_region *mem_region)
{
if (!FFA_MEM_REGION_HAS_EP_MEM_OFFSET(version)) {
mem_region->ep_mem_size = 0;
} else {
mem_region->ep_mem_size = ffa_emad_size_get(version);
mem_region->ep_mem_offset = sizeof(*mem_region);
memset(mem_region->reserved, 0, 12);
}
}
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;
u32 composite_offset;
phys_addr_t addr = 0;
struct ffa_mem_region *mem_region = buffer;
struct ffa_composite_mem_region *composite;
struct ffa_mem_region_addr_range *constituents;
struct ffa_mem_region_attributes *ep_mem_access;
u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg), ep_offset;
u32 emad_end, emad_size = ffa_emad_size_get(drv_info->version);
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);
ffa_mem_region_additional_setup(drv_info->version, mem_region);
composite_offset = ffa_mem_desc_offset(buffer, args->nattrs,
drv_info->version);
if (composite_offset + sizeof(*composite) > max_fragsize)
return -ENXIO;
for (idx = 0; idx < args->nattrs; idx++) {
ep_offset = ffa_mem_desc_offset(buffer, idx, drv_info->version);
if (check_add_overflow(ep_offset, emad_size, &emad_end))
return -ENXIO;
if (emad_end > max_fragsize)
return -ENXIO;
ep_mem_access = buffer + ep_offset;
memset(ep_mem_access, 0, emad_size);
ep_mem_access->receiver = args->attrs[idx].receiver;
ep_mem_access->attrs = args->attrs[idx].attrs;
ep_mem_access->composite_off = composite_offset;
ffa_emad_impdef_value_init(drv_info->version,
ep_mem_access->impdef_val,
args->attrs[idx].impdef_val);
}
mem_region->handle = 0;
mem_region->ep_count = args->nattrs;
composite = buffer + composite_offset;
composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg);
composite->addr_range_cnt = num_entries;
composite->reserved = 0;
length = composite_offset + CONSTITUENTS_OFFSET(num_entries);
frag_len = composite_offset + CONSTITUENTS_OFFSET(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 + sizeof(*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(*constituents);
} 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;
size_t rxtx_bufsz = drv_info->rxtx_bufsz;
if (!args->use_txbuf) {
buffer = alloc_pages_exact(rxtx_bufsz, 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_bufsz, args);
if (args->use_txbuf)
mutex_unlock(&drv_info->tx_lock);
else
free_pages_exact(buffer, rxtx_bufsz);
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_notification_bitmap_create(void)
{
ffa_value_t ret;
u16 vcpu_count = nr_cpu_ids;
invoke_ffa_fn((ffa_value_t){
.a0 = FFA_NOTIFICATION_BITMAP_CREATE,
.a1 = drv_info->vm_id, .a2 = vcpu_count,
}, &ret);
if (ret.a0 == FFA_ERROR)
return ffa_to_linux_errno((int)ret.a2);
return 0;
}
static int ffa_notification_bitmap_destroy(void)
{
ffa_value_t ret;
invoke_ffa_fn((ffa_value_t){
.a0 = FFA_NOTIFICATION_BITMAP_DESTROY,
.a1 = drv_info->vm_id,
}, &ret);
if (ret.a0 == FFA_ERROR)
return ffa_to_linux_errno((int)ret.a2);
return 0;
}
enum notify_type {
SECURE_PARTITION,
NON_SECURE_VM,
SPM_FRAMEWORK,
NS_HYP_FRAMEWORK,
};
#define NOTIFICATION_LOW_MASK GENMASK(31, 0)
#define NOTIFICATION_HIGH_MASK GENMASK(63, 32)
#define NOTIFICATION_BITMAP_HIGH(x) \
((u32)(FIELD_GET(NOTIFICATION_HIGH_MASK, (x))))
#define NOTIFICATION_BITMAP_LOW(x) \
((u32)(FIELD_GET(NOTIFICATION_LOW_MASK, (x))))
#define PACK_NOTIFICATION_BITMAP(low, high) \
(FIELD_PREP(NOTIFICATION_LOW_MASK, (low)) | \
FIELD_PREP(NOTIFICATION_HIGH_MASK, (high)))
#define RECEIVER_VCPU_MASK GENMASK(31, 16)
#define PACK_NOTIFICATION_GET_RECEIVER_INFO(vcpu_r, r) \
(FIELD_PREP(RECEIVER_VCPU_MASK, (vcpu_r)) | \
FIELD_PREP(RECEIVER_ID_MASK, (r)))
#define NOTIFICATION_INFO_GET_MORE_PEND_MASK BIT(0)
#define NOTIFICATION_INFO_GET_ID_COUNT GENMASK(11, 7)
#define ID_LIST_MASK_64 GENMASK(51, 12)
#define ID_LIST_MASK_32 GENMASK(31, 12)
#define MAX_IDS_64 20
#define MAX_IDS_32 10
#define PER_VCPU_NOTIFICATION_FLAG BIT(0)
#define SECURE_PARTITION_BITMAP_ENABLE BIT(SECURE_PARTITION)
#define NON_SECURE_VM_BITMAP_ENABLE BIT(NON_SECURE_VM)
#define SPM_FRAMEWORK_BITMAP_ENABLE BIT(SPM_FRAMEWORK)
#define NS_HYP_FRAMEWORK_BITMAP_ENABLE BIT(NS_HYP_FRAMEWORK)
#define FFA_BITMAP_SECURE_ENABLE_MASK \
(SECURE_PARTITION_BITMAP_ENABLE | SPM_FRAMEWORK_BITMAP_ENABLE)
#define FFA_BITMAP_NS_ENABLE_MASK \
(NON_SECURE_VM_BITMAP_ENABLE | NS_HYP_FRAMEWORK_BITMAP_ENABLE)
#define FFA_BITMAP_ALL_ENABLE_MASK \
(FFA_BITMAP_SECURE_ENABLE_MASK | FFA_BITMAP_NS_ENABLE_MASK)
#define FFA_SECURE_PARTITION_ID_FLAG BIT(15)
#define SPM_FRAMEWORK_BITMAP(x) NOTIFICATION_BITMAP_LOW(x)
#define NS_HYP_FRAMEWORK_BITMAP(x) NOTIFICATION_BITMAP_HIGH(x)
#define FRAMEWORK_NOTIFY_RX_BUFFER_FULL BIT(0)
static int ffa_notification_bind_common(u16 dst_id, u64 bitmap,
u32 flags, bool is_bind)
{
ffa_value_t ret;
u32 func, src_dst_ids = PACK_TARGET_INFO(dst_id, drv_info->vm_id);
func = is_bind ? FFA_NOTIFICATION_BIND : FFA_NOTIFICATION_UNBIND;
invoke_ffa_fn((ffa_value_t){
.a0 = func, .a1 = src_dst_ids, .a2 = flags,
.a3 = NOTIFICATION_BITMAP_LOW(bitmap),
.a4 = NOTIFICATION_BITMAP_HIGH(bitmap),
}, &ret);
if (ret.a0 == FFA_ERROR)
return ffa_to_linux_errno((int)ret.a2);
else if (ret.a0 != FFA_SUCCESS)
return -EINVAL;
return 0;
}
static
int ffa_notification_set(u16 src_id, u16 dst_id, u32 flags, u64 bitmap)
{
ffa_value_t ret;
u32 src_dst_ids = PACK_TARGET_INFO(dst_id, src_id);
invoke_ffa_fn((ffa_value_t) {
.a0 = FFA_NOTIFICATION_SET, .a1 = src_dst_ids, .a2 = flags,
.a3 = NOTIFICATION_BITMAP_LOW(bitmap),
.a4 = NOTIFICATION_BITMAP_HIGH(bitmap),
}, &ret);
if (ret.a0 == FFA_ERROR)
return ffa_to_linux_errno((int)ret.a2);
else if (ret.a0 != FFA_SUCCESS)
return -EINVAL;
return 0;
}
struct ffa_notify_bitmaps {
u64 sp_map;
u64 vm_map;
u64 arch_map;
};
static int ffa_notification_get(u32 flags, struct ffa_notify_bitmaps *notify)
{
ffa_value_t ret;
u16 src_id = drv_info->vm_id;
u16 cpu_id = smp_processor_id();
u32 rec_vcpu_ids = PACK_NOTIFICATION_GET_RECEIVER_INFO(cpu_id, src_id);
invoke_ffa_fn((ffa_value_t){
.a0 = FFA_NOTIFICATION_GET, .a1 = rec_vcpu_ids, .a2 = flags,
}, &ret);
if (ret.a0 == FFA_ERROR)
return ffa_to_linux_errno((int)ret.a2);
else if (ret.a0 != FFA_SUCCESS)
return -EINVAL; /* Something else went wrong. */
if (flags & SECURE_PARTITION_BITMAP_ENABLE)
notify->sp_map = PACK_NOTIFICATION_BITMAP(ret.a2, ret.a3);
if (flags & NON_SECURE_VM_BITMAP_ENABLE)
notify->vm_map = PACK_NOTIFICATION_BITMAP(ret.a4, ret.a5);
if (flags & SPM_FRAMEWORK_BITMAP_ENABLE)
notify->arch_map = SPM_FRAMEWORK_BITMAP(ret.a6);
if (flags & NS_HYP_FRAMEWORK_BITMAP_ENABLE)
notify->arch_map = PACK_NOTIFICATION_BITMAP(notify->arch_map,
ret.a7);
return 0;
}
struct ffa_dev_part_info {
ffa_sched_recv_cb callback;
void *cb_data;
rwlock_t rw_lock;
struct ffa_device *dev;
struct list_head node;
};
static void __do_sched_recv_cb(u16 part_id, u16 vcpu, bool is_per_vcpu)
{
struct ffa_dev_part_info *partition = NULL, *tmp;
ffa_sched_recv_cb callback;
struct list_head *phead;
void *cb_data;
phead = xa_load(&drv_info->partition_info, part_id);
if (!phead) {
pr_err("%s: Invalid partition ID 0x%x\n", __func__, part_id);
return;
}
list_for_each_entry_safe(partition, tmp, phead, node) {
read_lock(&partition->rw_lock);
callback = partition->callback;
cb_data = partition->cb_data;
read_unlock(&partition->rw_lock);
if (callback)
callback(vcpu, is_per_vcpu, cb_data);
}
}
/*
* Map logical ID index to the u16 index within the packed ID list.
*
* For native responses (FF-A width == kernel word size), IDs are
* tightly packed: idx -> idx.
*
* For 32-bit responses on a 64-bit kernel, each 64-bit register
* contributes 4 x u16 values but only the lower 2 are defined; the
* upper 2 are garbage. This mapping skips those upper halves:
* 0,1,2,3,4,5,... -> 0,1,4,5,8,9,...
*/
static int list_idx_to_u16_idx(int idx, bool is_native_resp)
{
return is_native_resp ? idx : idx + 2 * (idx >> 1);
}
static void ffa_notification_info_get(void)
{
int ids_processed, ids_count[MAX_IDS_64];
int idx, list, max_ids, lists_cnt;
bool is_64b_resp, is_native_resp;
ffa_value_t ret;
u64 id_list;
do {
invoke_ffa_fn((ffa_value_t){
.a0 = FFA_FN_NATIVE(NOTIFICATION_INFO_GET),
}, &ret);
if (ret.a0 != FFA_FN_NATIVE(SUCCESS) && ret.a0 != FFA_SUCCESS) {
if ((s32)ret.a2 != FFA_RET_NO_DATA)
pr_err("Notification Info fetch failed: 0x%lx (0x%lx)",
ret.a0, ret.a2);
return;
}
is_64b_resp = (ret.a0 == FFA_FN64_SUCCESS);
is_native_resp = (ret.a0 == FFA_FN_NATIVE(SUCCESS));
ids_processed = 0;
lists_cnt = FIELD_GET(NOTIFICATION_INFO_GET_ID_COUNT, ret.a2);
if (is_64b_resp) {
max_ids = MAX_IDS_64;
id_list = FIELD_GET(ID_LIST_MASK_64, ret.a2);
} else {
max_ids = MAX_IDS_32;
id_list = FIELD_GET(ID_LIST_MASK_32, ret.a2);
}
for (idx = 0; idx < lists_cnt; idx++, id_list >>= 2)
ids_count[idx] = (id_list & 0x3) + 1;
/* Process IDs */
for (list = 0; list < lists_cnt; list++) {
int u16_idx;
u16 vcpu_id, part_id, *packed_id_list = (u16 *)&ret.a3;
if (ids_processed >= max_ids - 1)
break;
u16_idx = list_idx_to_u16_idx(ids_processed,
is_native_resp);
part_id = packed_id_list[u16_idx];
ids_processed++;
if (ids_count[list] == 1) { /* Global Notification */
__do_sched_recv_cb(part_id, 0, false);
continue;
}
/* Per vCPU Notification */
for (idx = 1; idx < ids_count[list]; idx++) {
if (ids_processed >= max_ids - 1)
break;
u16_idx = list_idx_to_u16_idx(ids_processed,
is_native_resp);
vcpu_id = packed_id_list[u16_idx];
ids_processed++;
__do_sched_recv_cb(part_id, vcpu_id, true);
}
}
} while (ret.a2 & NOTIFICATION_INFO_GET_MORE_PEND_MASK);
}
static int ffa_run(struct ffa_device *dev, u16 vcpu)
{
ffa_value_t ret;
u32 target = dev->vm_id << 16 | vcpu;
invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = target, }, &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);
return 0;
}
static void ffa_drvinfo_flags_init(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;
if (!ffa_features(FFA_MSG_SEND_DIRECT_REQ2, 0, NULL, NULL) ||
!ffa_features(FFA_MSG_SEND_DIRECT_RESP2, 0, NULL, NULL))
drv_info->msg_direct_req2_supp = 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_str || 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_indirect_msg_send(struct ffa_device *dev, void *buf, size_t sz)
{
return ffa_msg_send2(dev, drv_info->vm_id, buf, sz);
}
static int ffa_sync_send_receive2(struct ffa_device *dev,
struct ffa_send_direct_data2 *data)
{
if (!drv_info->msg_direct_req2_supp)
return -EOPNOTSUPP;
return ffa_msg_send_direct_req2(drv_info->vm_id, dev->vm_id,
&dev->uuid, 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);
}
#define ffa_notifications_disabled() (!drv_info->notif_enabled)
struct notifier_cb_info {
struct hlist_node hnode;
struct ffa_device *dev;
ffa_fwk_notifier_cb fwk_cb;
ffa_notifier_cb cb;
void *cb_data;
};
static int
ffa_sched_recv_cb_update(struct ffa_device *dev, ffa_sched_recv_cb callback,
void *cb_data, bool is_registration)
{
struct ffa_dev_part_info *partition = NULL;
struct list_head *phead;
bool cb_valid;
if (ffa_notifications_disabled())
return -EOPNOTSUPP;
phead = xa_load(&drv_info->partition_info, dev->vm_id);
if (!phead) {
pr_err("%s: Invalid partition ID 0x%x\n", __func__, dev->vm_id);
return -EINVAL;
}
list_for_each_entry(partition, phead, node)
if (partition->dev == dev)
break;
if (&partition->node == phead) {
pr_err("%s: No such partition ID 0x%x\n", __func__, dev->vm_id);
return -EINVAL;
}
write_lock(&partition->rw_lock);
cb_valid = !!partition->callback;
if (!(is_registration ^ cb_valid)) {
write_unlock(&partition->rw_lock);
return -EINVAL;
}
partition->callback = callback;
partition->cb_data = cb_data;
write_unlock(&partition->rw_lock);
return 0;
}
static int ffa_sched_recv_cb_register(struct ffa_device *dev,
ffa_sched_recv_cb cb, void *cb_data)
{
return ffa_sched_recv_cb_update(dev, cb, cb_data, true);
}
static int ffa_sched_recv_cb_unregister(struct ffa_device *dev)
{
return ffa_sched_recv_cb_update(dev, NULL, NULL, false);
}
static int ffa_notification_bind(u16 dst_id, u64 bitmap, u32 flags)
{
return ffa_notification_bind_common(dst_id, bitmap, flags, true);
}
static int ffa_notification_unbind(u16 dst_id, u64 bitmap)
{
return ffa_notification_bind_common(dst_id, bitmap, 0, false);
}
static enum notify_type ffa_notify_type_get(u16 vm_id)
{
if (vm_id & FFA_SECURE_PARTITION_ID_FLAG)
return SECURE_PARTITION;
else
return NON_SECURE_VM;
}
/* notifier_hnode_get* should be called with notify_lock held */
static struct notifier_cb_info *
notifier_hnode_get_by_vmid(u16 notify_id, int vmid)
{
struct notifier_cb_info *node;
hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id)
if (node->fwk_cb && vmid == node->dev->vm_id)
return node;
return NULL;
}
static struct notifier_cb_info *
notifier_hnode_get_by_vmid_uuid(u16 notify_id, int vmid, const uuid_t *uuid)
{
struct notifier_cb_info *node;
if (uuid_is_null(uuid))
return notifier_hnode_get_by_vmid(notify_id, vmid);
hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id)
if (node->fwk_cb && vmid == node->dev->vm_id &&
uuid_equal(&node->dev->uuid, uuid))
return node;
return NULL;
}
static struct notifier_cb_info *
notifier_hnode_get_by_type(u16 notify_id, enum notify_type type)
{
struct notifier_cb_info *node;
hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id)
if (node->cb && type == ffa_notify_type_get(node->dev->vm_id))
return node;
return NULL;
}
static int update_notifier_cb(struct ffa_device *dev, int notify_id,
struct notifier_cb_info *cb, bool is_framework)
{
struct notifier_cb_info *cb_info = NULL;
enum notify_type type = ffa_notify_type_get(dev->vm_id);
bool cb_found, is_registration = !!cb;
if (is_framework)
cb_info = notifier_hnode_get_by_vmid_uuid(notify_id, dev->vm_id,
&dev->uuid);
else
cb_info = notifier_hnode_get_by_type(notify_id, type);
cb_found = !!cb_info;
if (!(is_registration ^ cb_found))
return -EINVAL;
if (is_registration) {
hash_add(drv_info->notifier_hash, &cb->hnode, notify_id);
} else {
hash_del(&cb_info->hnode);
kfree(cb_info);
}
return 0;
}
static int __ffa_notify_relinquish(struct ffa_device *dev, int notify_id,
bool is_framework)
{
int rc;
if (ffa_notifications_disabled())
return -EOPNOTSUPP;
if (notify_id >= FFA_MAX_NOTIFICATIONS)
return -EINVAL;
write_lock(&drv_info->notify_lock);
rc = update_notifier_cb(dev, notify_id, NULL, is_framework);
if (rc) {
pr_err("Could not unregister notification callback\n");
write_unlock(&drv_info->notify_lock);
return rc;
}
if (!is_framework)
rc = ffa_notification_unbind(dev->vm_id, BIT(notify_id));
write_unlock(&drv_info->notify_lock);
return rc;
}
static int ffa_notify_relinquish(struct ffa_device *dev, int notify_id)
{
return __ffa_notify_relinquish(dev, notify_id, false);
}
static int ffa_fwk_notify_relinquish(struct ffa_device *dev, int notify_id)
{
return __ffa_notify_relinquish(dev, notify_id, true);
}
static int __ffa_notify_request(struct ffa_device *dev, bool is_per_vcpu,
void *cb, void *cb_data,
int notify_id, bool is_framework)
{
int rc;
u32 flags = 0;
struct notifier_cb_info *cb_info = NULL;
if (ffa_notifications_disabled())
return -EOPNOTSUPP;
if (notify_id >= FFA_MAX_NOTIFICATIONS)
return -EINVAL;
cb_info = kzalloc_obj(*cb_info);
if (!cb_info)
return -ENOMEM;
cb_info->dev = dev;
cb_info->cb_data = cb_data;
if (is_framework)
cb_info->fwk_cb = cb;
else
cb_info->cb = cb;
write_lock(&drv_info->notify_lock);
if (!is_framework) {
if (is_per_vcpu)
flags = PER_VCPU_NOTIFICATION_FLAG;
rc = ffa_notification_bind(dev->vm_id, BIT(notify_id), flags);
if (rc)
goto out_unlock_free;
}
rc = update_notifier_cb(dev, notify_id, cb_info, is_framework);
if (rc) {
pr_err("Failed to register callback for %d - %d\n",
notify_id, rc);
if (!is_framework)
ffa_notification_unbind(dev->vm_id, BIT(notify_id));
}
out_unlock_free:
write_unlock(&drv_info->notify_lock);
if (rc)
kfree(cb_info);
return rc;
}
static int ffa_notify_request(struct ffa_device *dev, bool is_per_vcpu,
ffa_notifier_cb cb, void *cb_data, int notify_id)
{
return __ffa_notify_request(dev, is_per_vcpu, cb, cb_data, notify_id,
false);
}
static int
ffa_fwk_notify_request(struct ffa_device *dev, ffa_fwk_notifier_cb cb,
void *cb_data, int notify_id)
{
return __ffa_notify_request(dev, false, cb, cb_data, notify_id, true);
}
static int ffa_notify_send(struct ffa_device *dev, int notify_id,
bool is_per_vcpu, u16 vcpu)
{
u32 flags = 0;
if (ffa_notifications_disabled())
return -EOPNOTSUPP;
if (is_per_vcpu)
flags |= (PER_VCPU_NOTIFICATION_FLAG | vcpu << 16);
return ffa_notification_set(dev->vm_id, drv_info->vm_id, flags,
BIT(notify_id));
}
static void handle_notif_callbacks(u64 bitmap, enum notify_type type)
{
ffa_notifier_cb cb;
void *cb_data;
int notify_id;
for (notify_id = 0; notify_id <= FFA_MAX_NOTIFICATIONS && bitmap;
notify_id++, bitmap >>= 1) {
if (!(bitmap & 1))
continue;
scoped_guard(read_lock, &drv_info->notify_lock) {
struct notifier_cb_info *cb_info;
cb_info = notifier_hnode_get_by_type(notify_id, type);
cb = cb_info ? cb_info->cb : NULL;
cb_data = cb_info ? cb_info->cb_data : NULL;
}
if (cb)
cb(notify_id, cb_data);
}
}
static void handle_fwk_notif_callbacks(u32 bitmap)
{
void *buf;
uuid_t uuid;
void *fwk_cb_data;
int notify_id = 0, target;
ffa_fwk_notifier_cb fwk_cb;
struct ffa_indirect_msg_hdr *msg;
size_t min_offset = offsetof(struct ffa_indirect_msg_hdr, uuid);
/* Only one framework notification defined and supported for now */
if (!(bitmap & FRAMEWORK_NOTIFY_RX_BUFFER_FULL))
return;
scoped_guard(mutex, &drv_info->rx_lock) {
u32 offset, size;
msg = drv_info->rx_buffer;
offset = msg->offset;
size = msg->size;
if (!size || (offset != min_offset && offset < sizeof(*msg)) ||
offset > drv_info->rxtx_bufsz ||
size > drv_info->rxtx_bufsz - offset) {
pr_err("invalid framework notification message\n");
ffa_rx_release();
return;
}
buf = kmemdup((void *)msg + offset, size, GFP_KERNEL);
if (!buf) {
ffa_rx_release();
return;
}
target = SENDER_ID(msg->send_recv_id);
if (offset >= sizeof(*msg))
uuid_copy(&uuid, &msg->uuid);
else
uuid_copy(&uuid, &uuid_null);
ffa_rx_release();
}
scoped_guard(read_lock, &drv_info->notify_lock) {
struct notifier_cb_info *cb_info;
cb_info = notifier_hnode_get_by_vmid_uuid(notify_id, target,
&uuid);
fwk_cb = cb_info ? cb_info->fwk_cb : NULL;
fwk_cb_data = cb_info ? cb_info->cb_data : NULL;
}
if (fwk_cb)
fwk_cb(notify_id, fwk_cb_data, buf);
kfree(buf);
}
static void notif_get_and_handle(void *cb_data)
{
int rc;
u32 flags;
struct ffa_drv_info *info = cb_data;
struct ffa_notify_bitmaps bitmaps = { 0 };
if (info->vm_id == 0) /* Non secure physical instance */
flags = FFA_BITMAP_SECURE_ENABLE_MASK;
else
flags = FFA_BITMAP_ALL_ENABLE_MASK;
rc = ffa_notification_get(flags, &bitmaps);
if (rc) {
pr_err("Failed to retrieve notifications with %d!\n", rc);
return;
}
handle_fwk_notif_callbacks(SPM_FRAMEWORK_BITMAP(bitmaps.arch_map));
handle_fwk_notif_callbacks(NS_HYP_FRAMEWORK_BITMAP(bitmaps.arch_map));
handle_notif_callbacks(bitmaps.vm_map, NON_SECURE_VM);
handle_notif_callbacks(bitmaps.sp_map, SECURE_PARTITION);
}
static void
ffa_self_notif_handle(u16 vcpu, bool is_per_vcpu, void *cb_data)
{
struct ffa_drv_info *info = cb_data;
if (!is_per_vcpu)
notif_get_and_handle(info);
else
smp_call_function_single(vcpu, notif_get_and_handle, info, 0);
}
static void notif_pcpu_irq_work_fn(struct work_struct *work)
{
struct ffa_pcpu_irq *pcpu = container_of(work, struct ffa_pcpu_irq,
notif_pcpu_work);
struct ffa_drv_info *info = pcpu->info;
notif_get_and_handle(info);
}
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,
.indirect_send = ffa_indirect_msg_send,
.sync_send_receive2 = ffa_sync_send_receive2,
};
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_cpu_ops ffa_drv_cpu_ops = {
.run = ffa_run,
};
static const struct ffa_notifier_ops ffa_drv_notifier_ops = {
.sched_recv_cb_register = ffa_sched_recv_cb_register,
.sched_recv_cb_unregister = ffa_sched_recv_cb_unregister,
.notify_request = ffa_notify_request,
.notify_relinquish = ffa_notify_relinquish,
.fwk_notify_request = ffa_fwk_notify_request,
.fwk_notify_relinquish = ffa_fwk_notify_relinquish,
.notify_send = ffa_notify_send,
};
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,
.cpu_ops = &ffa_drv_cpu_ops,
.notifier_ops = &ffa_drv_notifier_ops,
};
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 int
ffa_bus_notifier(struct notifier_block *nb, unsigned long action, void *data)
{
struct device *dev = data;
struct ffa_device *fdev = to_ffa_dev(dev);
if (action == BUS_NOTIFY_BIND_DRIVER) {
struct ffa_driver *ffa_drv = to_ffa_driver(dev->driver);
const struct ffa_device_id *id_table = ffa_drv->id_table;
/*
* 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 workaround by copying
* the same from the driver table.
*/
if (uuid_is_null(&fdev->uuid))
ffa_device_match_uuid(fdev, &id_table->uuid);
return NOTIFY_OK;
}
return NOTIFY_DONE;
}
static struct notifier_block ffa_bus_nb = {
.notifier_call = ffa_bus_notifier,
};
static void ffa_bus_notifier_unregister(void)
{
if (!drv_info->bus_notifier_registered)
return;
bus_unregister_notifier(&ffa_bus_type, &ffa_bus_nb);
drv_info->bus_notifier_registered = false;
}
static int ffa_xa_add_partition_info(struct ffa_device *dev)
{
struct ffa_dev_part_info *info;
struct list_head *head, *phead;
int ret = -ENOMEM;
phead = xa_load(&drv_info->partition_info, dev->vm_id);
if (phead) {
head = phead;
list_for_each_entry(info, head, node) {
if (info->dev == dev) {
pr_err("%s: duplicate dev %p part ID 0x%x\n",
__func__, dev, dev->vm_id);
return -EEXIST;
}
}
}
info = kzalloc_obj(*info);
if (!info)
return ret;
rwlock_init(&info->rw_lock);
info->dev = dev;
if (!phead) {
phead = kzalloc_obj(*phead);
if (!phead)
goto free_out;
INIT_LIST_HEAD(phead);
ret = xa_insert(&drv_info->partition_info, dev->vm_id, phead,
GFP_KERNEL);
if (ret) {
pr_err("%s: failed to save part ID 0x%x Ret:%d\n",
__func__, dev->vm_id, ret);
goto free_out;
}
}
list_add(&info->node, phead);
return 0;
free_out:
kfree(phead);
kfree(info);
return ret;
}
static int ffa_setup_host_partition(int vm_id)
{
struct ffa_partition_info buf = { 0 };
struct ffa_device *ffa_dev;
int ret;
buf.id = vm_id;
ffa_dev = ffa_device_register(&buf, &ffa_drv_ops, &ffa_pdev->dev);
if (!ffa_dev) {
pr_err("%s: failed to register host partition ID 0x%x\n",
__func__, vm_id);
return -EINVAL;
}
ret = ffa_xa_add_partition_info(ffa_dev);
if (ret)
return ret;
if (ffa_notifications_disabled())
return 0;
ret = ffa_sched_recv_cb_update(ffa_dev, ffa_self_notif_handle,
drv_info, true);
if (ret)
pr_info("Failed to register driver sched callback %d\n", ret);
return ret;
}
static void ffa_partitions_cleanup(void)
{
struct list_head *phead;
unsigned long idx;
ffa_bus_notifier_unregister();
/* Clean up/free all registered devices */
ffa_devices_unregister();
xa_for_each(&drv_info->partition_info, idx, phead) {
struct ffa_dev_part_info *info, *tmp;
xa_erase(&drv_info->partition_info, idx);
list_for_each_entry_safe(info, tmp, phead, node) {
list_del(&info->node);
kfree(info);
}
kfree(phead);
}
xa_destroy(&drv_info->partition_info);
}
static int ffa_setup_partitions(void)
{
int count, idx, ret;
struct ffa_device *ffa_dev;
struct ffa_partition_info *pbuf, *tpbuf;
if (!FFA_PART_INFO_HAS_UUID_IN_RESP(drv_info->version)) {
ret = bus_register_notifier(&ffa_bus_type, &ffa_bus_nb);
if (ret)
pr_err("Failed to register FF-A bus notifiers\n");
else
drv_info->bus_notifier_registered = true;
}
count = ffa_partition_probe(&uuid_null, &pbuf);
if (count <= 0) {
pr_info("%s: No partitions found, error %d\n", __func__, count);
ffa_bus_notifier_unregister();
return -EINVAL;
}
xa_init(&drv_info->partition_info);
for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) {
/* Note that if the UUID will be uuid_null, that will require
* ffa_bus_notifier() 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(tpbuf, &ffa_drv_ops,
&ffa_pdev->dev);
if (!ffa_dev) {
pr_err("%s: failed to register partition ID 0x%x\n",
__func__, tpbuf->id);
continue;
}
if (FFA_PART_INFO_HAS_EXEC_STATE_IN_RESP(drv_info->version) &&
!(tpbuf->properties & FFA_PARTITION_AARCH64_EXEC))
ffa_mode_32bit_set(ffa_dev);
if (ffa_xa_add_partition_info(ffa_dev)) {
ffa_device_unregister(ffa_dev);
continue;
}
}
kfree(pbuf);
/*
* Check if the host is already added as part of partition info
* No multiple UUID possible for the host, so just checking if
* there is an entry will suffice
*/
if (xa_load(&drv_info->partition_info, drv_info->vm_id))
return 0;
/* Allocate for the host */
ret = ffa_setup_host_partition(drv_info->vm_id);
if (ret)
ffa_partitions_cleanup();
return ret;
}
/* FFA FEATURE IDs */
#define FFA_FEAT_NOTIFICATION_PENDING_INT (1)
#define FFA_FEAT_SCHEDULE_RECEIVER_INT (2)
#define FFA_FEAT_MANAGED_EXIT_INT (3)
static irqreturn_t ffa_sched_recv_irq_handler(int irq, void *irq_data)
{
struct ffa_pcpu_irq *pcpu = irq_data;
struct ffa_drv_info *info = pcpu->info;
queue_work(info->notif_pcpu_wq, &info->sched_recv_irq_work);
return IRQ_HANDLED;
}
static irqreturn_t notif_pend_irq_handler(int irq, void *irq_data)
{
struct ffa_pcpu_irq *pcpu = irq_data;
struct ffa_drv_info *info = pcpu->info;
queue_work_on(smp_processor_id(), info->notif_pcpu_wq,
&pcpu->notif_pcpu_work);
return IRQ_HANDLED;
}
static void ffa_sched_recv_irq_work_fn(struct work_struct *work)
{
ffa_notification_info_get();
}
static int ffa_irq_map(u32 id)
{
char *err_str;
int ret, irq, intid;
if (id == FFA_FEAT_NOTIFICATION_PENDING_INT)
err_str = "Notification Pending Interrupt";
else if (id == FFA_FEAT_SCHEDULE_RECEIVER_INT)
err_str = "Schedule Receiver Interrupt";
else
err_str = "Unknown ID";
/* The returned intid is assumed to be SGI donated to NS world */
ret = ffa_features(id, 0, &intid, NULL);
if (ret < 0) {
if (ret != -EOPNOTSUPP)
pr_err("Failed to retrieve FF-A %s %u\n", err_str, id);
return ret;
}
if (acpi_disabled) {
struct of_phandle_args oirq = {};
struct device_node *gic;
/* Only GICv3 supported currently with the device tree */
gic = of_find_compatible_node(NULL, NULL, "arm,gic-v3");
if (!gic)
return -ENXIO;
oirq.np = gic;
oirq.args_count = 1;
oirq.args[0] = intid;
irq = irq_create_of_mapping(&oirq);
of_node_put(gic);
#ifdef CONFIG_ACPI
} else {
irq = acpi_register_gsi(NULL, intid, ACPI_EDGE_SENSITIVE,
ACPI_ACTIVE_HIGH);
#endif
}
if (irq <= 0) {
pr_err("Failed to create IRQ mapping!\n");
return -ENODATA;
}
return irq;
}
static void ffa_irq_unmap(unsigned int irq)
{
if (!irq)
return;
irq_dispose_mapping(irq);
}
static int ffa_cpuhp_pcpu_irq_enable(unsigned int cpu)
{
if (drv_info->sched_recv_irq)
enable_percpu_irq(drv_info->sched_recv_irq, IRQ_TYPE_NONE);
if (drv_info->notif_pend_irq)
enable_percpu_irq(drv_info->notif_pend_irq, IRQ_TYPE_NONE);
return 0;
}
static int ffa_cpuhp_pcpu_irq_disable(unsigned int cpu)
{
if (drv_info->sched_recv_irq)
disable_percpu_irq(drv_info->sched_recv_irq);
if (drv_info->notif_pend_irq)
disable_percpu_irq(drv_info->notif_pend_irq);
return 0;
}
static void ffa_uninit_pcpu_irq(void)
{
if (drv_info->cpuhp_state) {
cpuhp_remove_state(drv_info->cpuhp_state);
drv_info->cpuhp_state = 0;
}
if (drv_info->notif_pcpu_wq) {
destroy_workqueue(drv_info->notif_pcpu_wq);
drv_info->notif_pcpu_wq = NULL;
}
if (drv_info->sched_recv_irq)
free_percpu_irq(drv_info->sched_recv_irq, drv_info->irq_pcpu);
if (drv_info->notif_pend_irq)
free_percpu_irq(drv_info->notif_pend_irq, drv_info->irq_pcpu);
if (drv_info->irq_pcpu) {
free_percpu(drv_info->irq_pcpu);
drv_info->irq_pcpu = NULL;
}
}
static int ffa_init_pcpu_irq(void)
{
struct ffa_pcpu_irq __percpu *irq_pcpu;
int ret, cpu;
irq_pcpu = alloc_percpu(struct ffa_pcpu_irq);
if (!irq_pcpu)
return -ENOMEM;
for_each_present_cpu(cpu) {
per_cpu_ptr(irq_pcpu, cpu)->info = drv_info;
INIT_WORK(&per_cpu_ptr(irq_pcpu, cpu)->notif_pcpu_work,
notif_pcpu_irq_work_fn);
}
drv_info->irq_pcpu = irq_pcpu;
if (drv_info->sched_recv_irq) {
ret = request_percpu_irq(drv_info->sched_recv_irq,
ffa_sched_recv_irq_handler,
"ARM-FFA-SRI", irq_pcpu);
if (ret) {
pr_err("Error registering percpu SRI nIRQ %d : %d\n",
drv_info->sched_recv_irq, ret);
drv_info->sched_recv_irq = 0;
return ret;
}
}
if (drv_info->notif_pend_irq) {
ret = request_percpu_irq(drv_info->notif_pend_irq,
notif_pend_irq_handler,
"ARM-FFA-NPI", irq_pcpu);
if (ret) {
pr_err("Error registering percpu NPI nIRQ %d : %d\n",
drv_info->notif_pend_irq, ret);
drv_info->notif_pend_irq = 0;
return ret;
}
}
INIT_WORK(&drv_info->sched_recv_irq_work, ffa_sched_recv_irq_work_fn);
drv_info->notif_pcpu_wq = create_workqueue("ffa_pcpu_irq_notification");
if (!drv_info->notif_pcpu_wq)
return -EINVAL;
ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ffa/pcpu-irq:starting",
ffa_cpuhp_pcpu_irq_enable,
ffa_cpuhp_pcpu_irq_disable);
if (ret < 0)
return ret;
drv_info->cpuhp_state = ret;
return 0;
}
static void ffa_notifications_cleanup(void)
{
ffa_uninit_pcpu_irq();
ffa_irq_unmap(drv_info->sched_recv_irq);
drv_info->sched_recv_irq = 0;
ffa_irq_unmap(drv_info->notif_pend_irq);
drv_info->notif_pend_irq = 0;
if (drv_info->bitmap_created) {
ffa_notification_bitmap_destroy();
drv_info->bitmap_created = false;
}
drv_info->notif_enabled = false;
}
static void ffa_notifications_setup(void)
{
int ret;
ret = ffa_features(FFA_NOTIFICATION_BITMAP_CREATE, 0, NULL, NULL);
if (!ret) {
ret = ffa_notification_bitmap_create();
if (ret) {
pr_err("Notification bitmap create error %d\n", ret);
return;
}
drv_info->bitmap_created = true;
}
ret = ffa_irq_map(FFA_FEAT_SCHEDULE_RECEIVER_INT);
if (ret > 0)
drv_info->sched_recv_irq = ret;
ret = ffa_irq_map(FFA_FEAT_NOTIFICATION_PENDING_INT);
if (ret > 0)
drv_info->notif_pend_irq = ret;
if (!drv_info->sched_recv_irq && !drv_info->notif_pend_irq)
goto cleanup;
ret = ffa_init_pcpu_irq();
if (ret)
goto cleanup;
hash_init(drv_info->notifier_hash);
rwlock_init(&drv_info->notify_lock);
drv_info->notif_enabled = true;
return;
cleanup:
pr_info("Notification setup failed %d, not enabled\n", ret);
ffa_notifications_cleanup();
}
static int ffa_probe(struct platform_device *pdev)
{
int ret;
u32 buf_sz;
size_t rxtx_min_bufsz = SZ_4K, rxtx_max_bufsz = 0, rxtx_bufsz;
if (IS_BUILTIN(CONFIG_ARM_FFA_TRANSPORT) &&
is_protected_kvm_enabled() && !is_pkvm_initialized())
return -EPROBE_DEFER;
ret = ffa_transport_init(&invoke_ffa_fn);
if (ret)
return ret == -EOPNOTSUPP ? -ENODEV : ret;
drv_info = kzalloc_obj(*drv_info);
if (!drv_info)
return -ENOMEM;
platform_set_drvdata(pdev, drv_info);
ret = ffa_version_check(&drv_info->version);
if (ret) {
if (ret == -EOPNOTSUPP)
ret = -ENODEV;
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;
}
ret = ffa_features(FFA_FN_NATIVE(RXTX_MAP), 0, &buf_sz, NULL);
if (!ret) {
if (RXTX_MAP_MIN_BUFSZ(buf_sz) == 1)
rxtx_min_bufsz = SZ_64K;
else if (RXTX_MAP_MIN_BUFSZ(buf_sz) == 2)
rxtx_min_bufsz = SZ_16K;
else
rxtx_min_bufsz = SZ_4K;
rxtx_max_bufsz = RXTX_MAP_MAX_BUFSZ(buf_sz) * SZ_4K;
if (rxtx_max_bufsz != 0 && rxtx_max_bufsz < rxtx_min_bufsz)
rxtx_max_bufsz = rxtx_min_bufsz;
}
rxtx_bufsz = min_not_zero(PAGE_ALIGN(rxtx_min_bufsz), rxtx_max_bufsz);
drv_info->rx_buffer = alloc_pages_exact(rxtx_bufsz, GFP_KERNEL);
if (!drv_info->rx_buffer) {
ret = -ENOMEM;
goto free_drv_info;
}
drv_info->tx_buffer = alloc_pages_exact(rxtx_bufsz, 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_bufsz / FFA_PAGE_SIZE);
if (ret == -EINVAL && !rxtx_max_bufsz && rxtx_min_bufsz < rxtx_bufsz) {
rxtx_bufsz = rxtx_min_bufsz;
ret = ffa_rxtx_map(virt_to_phys(drv_info->tx_buffer),
virt_to_phys(drv_info->rx_buffer),
rxtx_bufsz / FFA_PAGE_SIZE);
}
if (ret) {
pr_err("failed to register FFA RxTx buffers\n");
goto free_pages;
}
drv_info->rxtx_bufsz = rxtx_bufsz;
mutex_init(&drv_info->rx_lock);
mutex_init(&drv_info->tx_lock);
ffa_drvinfo_flags_init();
ffa_notifications_setup();
ret = ffa_setup_partitions();
if (!ret)
return ret;
pr_err("failed to setup partitions\n");
ffa_notifications_cleanup();
ffa_rxtx_unmap();
free_pages:
if (drv_info->tx_buffer)
free_pages_exact(drv_info->tx_buffer, rxtx_bufsz);
free_pages_exact(drv_info->rx_buffer, rxtx_bufsz);
free_drv_info:
platform_set_drvdata(pdev, NULL);
kfree(drv_info);
drv_info = NULL;
return ret;
}
static void ffa_remove(struct platform_device *pdev)
{
struct ffa_drv_info *info = platform_get_drvdata(pdev);
ffa_notifications_cleanup();
ffa_partitions_cleanup();
ffa_rxtx_unmap();
free_pages_exact(info->tx_buffer, info->rxtx_bufsz);
free_pages_exact(info->rx_buffer, info->rxtx_bufsz);
kfree(info);
platform_set_drvdata(pdev, NULL);
drv_info = NULL;
}
static struct platform_driver ffa_driver = {
.probe = ffa_probe,
.remove = ffa_remove,
.driver = {
.name = FFA_PLATFORM_NAME,
},
};
static int __init ffa_init(void)
{
int ret;
ffa_pdev = platform_device_register_simple(FFA_PLATFORM_NAME,
PLATFORM_DEVID_NONE,
NULL, 0);
if (IS_ERR(ffa_pdev))
return PTR_ERR(ffa_pdev);
ret = platform_driver_register(&ffa_driver);
if (ret)
platform_device_unregister(ffa_pdev);
return ret;
}
module_init(ffa_init);
static void __exit ffa_exit(void)
{
platform_device_unregister(ffa_pdev);
platform_driver_unregister(&ffa_driver);
}
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");
