OSCL-LXR linux-6.0.1/​drivers/​firmware/​arm_ffa/​driver.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // 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)
 {
     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;
 };
 
 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 = MAJOR_VERSION(version), minor = MINOR_VERSION(version);
     u16 drv_major = MAJOR_VERSION(FFA_DRIVER_VERSION);
     u16 drv_minor = 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",
                MAJOR_VERSION(ver.a0), MINOR_VERSION(ver.a0),
                MAJOR_VERSION(FFA_MIN_VERSION),
                MINOR_VERSION(FFA_MIN_VERSION));
         return -EINVAL;
     }
 
     pr_info("Driver version %d.%d\n", MAJOR_VERSION(FFA_DRIVER_VERSION),
         MINOR_VERSION(FFA_DRIVER_VERSION));
     pr_info("Firmware version %d.%d found\n", MAJOR_VERSION(ver.a0),
         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;
 }
 
 /* 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) {
         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 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, &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 int
 ffa_memory_lend(struct ffa_device *dev, 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 (dev->mode_32bit)
         return ffa_memory_ops(FFA_MEM_LEND, args);
 
     return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), 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,
     .memory_lend = ffa_memory_lend,
 };
 
 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;
         }
     }
     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");

This page was automatically generated by the 2.1.0 LXR engine. The LXR team