#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/slab.h>
+#include <linux/uuid.h>
#include "common.h"
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;
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)
{
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 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 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,
+};
+
+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;
mutex_init(&drv_info->rx_lock);
mutex_init(&drv_info->tx_lock);
+ ffa_setup_partitions();
+
return 0;
free_pages:
if (drv_info->tx_buffer)
#ifndef _LINUX_ARM_FFA_H
#define _LINUX_ARM_FFA_H
-#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/types.h>
/* FFA Bus/Device/Driver related */
struct ffa_device {
int vm_id;
+ bool mode_32bit;
uuid_t uuid;
struct device dev;
};
const char *mod_name);
void ffa_driver_unregister(struct ffa_driver *driver);
bool ffa_device_is_valid(struct ffa_device *ffa_dev);
+const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev);
#else
static inline
static inline
bool ffa_device_is_valid(struct ffa_device *ffa_dev) { return false; }
+static inline
+const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev)
+{
+ return NULL;
+}
#endif /* CONFIG_ARM_FFA_TRANSPORT */
#define ffa_register(driver) \
#define module_ffa_driver(__ffa_driver) \
module_driver(__ffa_driver, ffa_register, ffa_unregister)
+/* FFA transport related */
+struct ffa_partition_info {
+ u16 id;
+ u16 exec_ctxt;
+/* partition supports receipt of direct requests */
+#define FFA_PARTITION_DIRECT_RECV BIT(0)
+/* partition can send direct requests. */
+#define FFA_PARTITION_DIRECT_SEND BIT(1)
+/* partition can send and receive indirect messages. */
+#define FFA_PARTITION_INDIRECT_MSG BIT(2)
+ u32 properties;
+};
+
+/* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP} which pass data via registers */
+struct ffa_send_direct_data {
+ unsigned long data0; /* w3/x3 */
+ unsigned long data1; /* w4/x4 */
+ unsigned long data2; /* w5/x5 */
+ unsigned long data3; /* w6/x6 */
+ unsigned long data4; /* w7/x7 */
+};
+
+struct ffa_dev_ops {
+ u32 (*api_version_get)(void);
+ int (*partition_info_get)(const char *uuid_str,
+ struct ffa_partition_info *buffer);
+ void (*mode_32bit_set)(struct ffa_device *dev);
+ int (*sync_send_receive)(struct ffa_device *dev,
+ struct ffa_send_direct_data *data);
+};
+
#endif /* _LINUX_ARM_FFA_H */
projects / thirdparty / kernel / linux.git / commitdiff
