firmware: arm_ffa: Setup in-kernel users of FFA partitions (d0c0bce8) · Commits · EulixOS / Software / Kernel

drivers/firmware/arm_ffa/bus.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -24,6 +24,15 @@ static int ffa_device_match(struct device dev, struct device_driver drv)
		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++;

drivers/firmware/arm_ffa/common.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -6,6 +6,7 @@
		#ifndef _FFA_COMMON_H
		#define _FFA_COMMON_H

		#include <linux/arm_ffa.h>
		#include <linux/arm-smccc.h>
		#include <linux/err.h>

		@@ -15,6 +16,8 @@ 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);

drivers/firmware/arm_ffa/driver.c

+221 −0

Original line number	Diff line number	Diff line
		@@ -24,9 +24,12 @@

		#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"

		@@ -185,6 +188,22 @@ static int ffa_version_check(u32 *version)
		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;
		@@ -214,6 +233,65 @@ static int ffa_rxtx_unmap(u16 vm_id)
		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)
		{
		@@ -231,6 +309,147 @@ 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;
		@@ -282,6 +501,8 @@ static int __init ffa_init(void)
		mutex_init(&drv_info->rx_lock);
		mutex_init(&drv_info->tx_lock);

		ffa_setup_partitions();

		return 0;
		free_pages:
		if (drv_info->tx_buffer)

include/linux/arm_ffa.h

+38 −1

Original line number	Diff line number	Diff line
		@@ -6,7 +6,6 @@
		#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>
		@@ -15,6 +14,7 @@
		/* FFA Bus/Device/Driver related */
		struct ffa_device {
		int vm_id;
		bool mode_32bit;
		uuid_t uuid;
		struct device dev;
		};
		@@ -48,6 +48,7 @@ int ffa_driver_register(struct ffa_driver driver, struct module owner,
		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
		@@ -70,6 +71,11 @@ static inline void ffa_driver_unregister(struct ffa_driver *driver) {}
		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) \
		@@ -88,4 +94,35 @@ bool ffa_device_is_valid(struct ffa_device *ffa_dev) { return false; }
		#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 */