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firmware: arm_ffa: Add support for MEM_* interfaces
Most of the MEM_* APIs share the same parameters, so they can be generalised. Currently only MEM_SHARE is implemented and the user space interface for that is not added yet. Link: https://lore.kernel.org/r/20210521151033.181846-6-sudeep.holla@arm.com Tested-by: Jens Wiklander <jens.wiklander@linaro.org> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Sudeep Holla
parent
d0c0bce831
commit
cc2195fe53
2 changed files with 338 additions and 0 deletions
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@ -28,6 +28,8 @@
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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#include <linux/uuid.h>
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@ -349,6 +351,192 @@ static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit,
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return -EINVAL;
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}
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static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz,
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u32 frag_len, u32 len, u64 *handle)
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{
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ffa_value_t ret;
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invoke_ffa_fn((ffa_value_t){
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.a0 = func_id, .a1 = len, .a2 = frag_len,
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.a3 = buf, .a4 = buf_sz,
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}, &ret);
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while (ret.a0 == FFA_MEM_OP_PAUSE)
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invoke_ffa_fn((ffa_value_t){
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.a0 = FFA_MEM_OP_RESUME,
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.a1 = ret.a1, .a2 = ret.a2,
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}, &ret);
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if (ret.a0 == FFA_ERROR)
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return ffa_to_linux_errno((int)ret.a2);
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if (ret.a0 != FFA_SUCCESS)
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return -EOPNOTSUPP;
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if (handle)
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*handle = PACK_HANDLE(ret.a2, ret.a3);
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return frag_len;
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}
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static int ffa_mem_next_frag(u64 handle, u32 frag_len)
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{
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ffa_value_t ret;
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invoke_ffa_fn((ffa_value_t){
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.a0 = FFA_MEM_FRAG_TX,
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.a1 = HANDLE_LOW(handle), .a2 = HANDLE_HIGH(handle),
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.a3 = frag_len,
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}, &ret);
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while (ret.a0 == FFA_MEM_OP_PAUSE)
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invoke_ffa_fn((ffa_value_t){
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.a0 = FFA_MEM_OP_RESUME,
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.a1 = ret.a1, .a2 = ret.a2,
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}, &ret);
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if (ret.a0 == FFA_ERROR)
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return ffa_to_linux_errno((int)ret.a2);
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if (ret.a0 != FFA_MEM_FRAG_RX)
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return -EOPNOTSUPP;
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return ret.a3;
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}
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static int
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ffa_transmit_fragment(u32 func_id, phys_addr_t buf, u32 buf_sz, u32 frag_len,
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u32 len, u64 *handle, bool first)
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{
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if (!first)
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return ffa_mem_next_frag(*handle, frag_len);
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return ffa_mem_first_frag(func_id, buf, buf_sz, frag_len, len, handle);
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}
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static u32 ffa_get_num_pages_sg(struct scatterlist *sg)
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{
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u32 num_pages = 0;
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do {
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num_pages += sg->length / FFA_PAGE_SIZE;
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} while ((sg = sg_next(sg)));
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return num_pages;
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}
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static int
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ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize,
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struct ffa_mem_ops_args *args)
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{
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int rc = 0;
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bool first = true;
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phys_addr_t addr = 0;
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struct ffa_composite_mem_region *composite;
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struct ffa_mem_region_addr_range *constituents;
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struct ffa_mem_region_attributes *ep_mem_access;
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struct ffa_mem_region *mem_region = buffer;
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u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg);
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mem_region->tag = args->tag;
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mem_region->flags = args->flags;
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mem_region->sender_id = drv_info->vm_id;
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mem_region->attributes = FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK |
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FFA_MEM_INNER_SHAREABLE;
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ep_mem_access = &mem_region->ep_mem_access[0];
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for (idx = 0; idx < args->nattrs; idx++, ep_mem_access++) {
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ep_mem_access->receiver = args->attrs[idx].receiver;
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ep_mem_access->attrs = args->attrs[idx].attrs;
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ep_mem_access->composite_off = COMPOSITE_OFFSET(args->nattrs);
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}
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mem_region->ep_count = args->nattrs;
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composite = buffer + COMPOSITE_OFFSET(args->nattrs);
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composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg);
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composite->addr_range_cnt = num_entries;
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length = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, num_entries);
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frag_len = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, 0);
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if (frag_len > max_fragsize)
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return -ENXIO;
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if (!args->use_txbuf) {
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addr = virt_to_phys(buffer);
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buf_sz = max_fragsize / FFA_PAGE_SIZE;
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}
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constituents = buffer + frag_len;
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idx = 0;
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do {
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if (frag_len == max_fragsize) {
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rc = ffa_transmit_fragment(func_id, addr, buf_sz,
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frag_len, length,
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&args->g_handle, first);
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if (rc < 0)
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return -ENXIO;
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first = false;
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idx = 0;
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frag_len = 0;
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constituents = buffer;
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}
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if ((void *)constituents - buffer > max_fragsize) {
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pr_err("Memory Region Fragment > Tx Buffer size\n");
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return -EFAULT;
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}
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constituents->address = sg_phys(args->sg);
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constituents->pg_cnt = args->sg->length / FFA_PAGE_SIZE;
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constituents++;
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frag_len += sizeof(struct ffa_mem_region_addr_range);
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} while ((args->sg = sg_next(args->sg)));
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return ffa_transmit_fragment(func_id, addr, buf_sz, frag_len,
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length, &args->g_handle, first);
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}
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static int ffa_memory_ops(u32 func_id, struct ffa_mem_ops_args *args)
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{
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int ret;
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void *buffer;
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if (!args->use_txbuf) {
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buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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} else {
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buffer = drv_info->tx_buffer;
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mutex_lock(&drv_info->tx_lock);
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}
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ret = ffa_setup_and_transmit(func_id, buffer, RXTX_BUFFER_SIZE, args);
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if (args->use_txbuf)
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mutex_unlock(&drv_info->tx_lock);
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else
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free_pages_exact(buffer, RXTX_BUFFER_SIZE);
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return ret < 0 ? ret : 0;
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}
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static int ffa_memory_reclaim(u64 g_handle, u32 flags)
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{
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ffa_value_t ret;
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invoke_ffa_fn((ffa_value_t){
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.a0 = FFA_MEM_RECLAIM,
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.a1 = HANDLE_LOW(g_handle), .a2 = HANDLE_HIGH(g_handle),
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.a3 = flags,
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}, &ret);
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if (ret.a0 == FFA_ERROR)
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return ffa_to_linux_errno((int)ret.a2);
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return 0;
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}
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static u32 ffa_api_version_get(void)
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{
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return drv_info->version;
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@ -387,11 +575,22 @@ static int ffa_sync_send_receive(struct ffa_device *dev,
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dev->mode_32bit, data);
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}
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static int
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ffa_memory_share(struct ffa_device *dev, struct ffa_mem_ops_args *args)
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{
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if (dev->mode_32bit)
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return ffa_memory_ops(FFA_MEM_SHARE, args);
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return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args);
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}
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static const struct ffa_dev_ops ffa_ops = {
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.api_version_get = ffa_api_version_get,
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.partition_info_get = ffa_partition_info_get,
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.mode_32bit_set = ffa_mode_32bit_set,
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.sync_send_receive = ffa_sync_send_receive,
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.memory_reclaim = ffa_memory_reclaim,
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.memory_share = ffa_memory_share,
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};
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const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev)
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@ -116,6 +116,142 @@ struct ffa_send_direct_data {
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unsigned long data4; /* w7/x7 */
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};
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struct ffa_mem_region_addr_range {
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/* The base IPA of the constituent memory region, aligned to 4 kiB */
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u64 address;
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/* The number of 4 kiB pages in the constituent memory region. */
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u32 pg_cnt;
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u32 reserved;
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};
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struct ffa_composite_mem_region {
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/*
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* The total number of 4 kiB pages included in this memory region. This
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* must be equal to the sum of page counts specified in each
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* `struct ffa_mem_region_addr_range`.
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*/
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u32 total_pg_cnt;
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/* The number of constituents included in this memory region range */
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u32 addr_range_cnt;
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u64 reserved;
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/** An array of `addr_range_cnt` memory region constituents. */
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struct ffa_mem_region_addr_range constituents[];
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};
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struct ffa_mem_region_attributes {
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/* The ID of the VM to which the memory is being given or shared. */
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u16 receiver;
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/*
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* The permissions with which the memory region should be mapped in the
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* receiver's page table.
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*/
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#define FFA_MEM_EXEC BIT(3)
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#define FFA_MEM_NO_EXEC BIT(2)
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#define FFA_MEM_RW BIT(1)
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#define FFA_MEM_RO BIT(0)
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u8 attrs;
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/*
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* Flags used during FFA_MEM_RETRIEVE_REQ and FFA_MEM_RETRIEVE_RESP
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* for memory regions with multiple borrowers.
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*/
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#define FFA_MEM_RETRIEVE_SELF_BORROWER BIT(0)
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u8 flag;
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u32 composite_off;
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/*
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* Offset in bytes from the start of the outer `ffa_memory_region` to
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* an `struct ffa_mem_region_addr_range`.
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*/
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u64 reserved;
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};
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struct ffa_mem_region {
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/* The ID of the VM/owner which originally sent the memory region */
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u16 sender_id;
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#define FFA_MEM_NORMAL BIT(5)
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#define FFA_MEM_DEVICE BIT(4)
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#define FFA_MEM_WRITE_BACK (3 << 2)
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#define FFA_MEM_NON_CACHEABLE (1 << 2)
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#define FFA_DEV_nGnRnE (0 << 2)
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#define FFA_DEV_nGnRE (1 << 2)
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#define FFA_DEV_nGRE (2 << 2)
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#define FFA_DEV_GRE (3 << 2)
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#define FFA_MEM_NON_SHAREABLE (0)
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#define FFA_MEM_OUTER_SHAREABLE (2)
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#define FFA_MEM_INNER_SHAREABLE (3)
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u8 attributes;
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u8 reserved_0;
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/*
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* Clear memory region contents after unmapping it from the sender and
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* before mapping it for any receiver.
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*/
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#define FFA_MEM_CLEAR BIT(0)
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/*
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* Whether the hypervisor may time slice the memory sharing or retrieval
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* operation.
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*/
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#define FFA_TIME_SLICE_ENABLE BIT(1)
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#define FFA_MEM_RETRIEVE_TYPE_IN_RESP (0 << 3)
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#define FFA_MEM_RETRIEVE_TYPE_SHARE (1 << 3)
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#define FFA_MEM_RETRIEVE_TYPE_LEND (2 << 3)
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#define FFA_MEM_RETRIEVE_TYPE_DONATE (3 << 3)
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#define FFA_MEM_RETRIEVE_ADDR_ALIGN_HINT BIT(9)
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#define FFA_MEM_RETRIEVE_ADDR_ALIGN(x) ((x) << 5)
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/* Flags to control behaviour of the transaction. */
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u32 flags;
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#define HANDLE_LOW_MASK GENMASK_ULL(31, 0)
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#define HANDLE_HIGH_MASK GENMASK_ULL(63, 32)
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#define HANDLE_LOW(x) ((u32)(FIELD_GET(HANDLE_LOW_MASK, (x))))
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#define HANDLE_HIGH(x) ((u32)(FIELD_GET(HANDLE_HIGH_MASK, (x))))
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#define PACK_HANDLE(l, h) \
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(FIELD_PREP(HANDLE_LOW_MASK, (l)) | FIELD_PREP(HANDLE_HIGH_MASK, (h)))
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/*
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* A globally-unique ID assigned by the hypervisor for a region
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* of memory being sent between VMs.
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*/
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u64 handle;
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/*
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* An implementation defined value associated with the receiver and the
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* memory region.
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*/
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u64 tag;
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u32 reserved_1;
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/*
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* The number of `ffa_mem_region_attributes` entries included in this
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* transaction.
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*/
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u32 ep_count;
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/*
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* An array of endpoint memory access descriptors.
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* Each one specifies a memory region offset, an endpoint and the
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* attributes with which this memory region should be mapped in that
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* endpoint's page table.
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*/
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struct ffa_mem_region_attributes ep_mem_access[];
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};
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#define COMPOSITE_OFFSET(x) \
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(offsetof(struct ffa_mem_region, ep_mem_access[x]))
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#define CONSTITUENTS_OFFSET(x) \
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(offsetof(struct ffa_composite_mem_region, constituents[x]))
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#define COMPOSITE_CONSTITUENTS_OFFSET(x, y) \
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(COMPOSITE_OFFSET(x) + CONSTITUENTS_OFFSET(y))
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struct ffa_mem_ops_args {
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bool use_txbuf;
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u32 nattrs;
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u32 flags;
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u64 tag;
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u64 g_handle;
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struct scatterlist *sg;
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struct ffa_mem_region_attributes *attrs;
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};
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struct ffa_dev_ops {
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u32 (*api_version_get)(void);
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int (*partition_info_get)(const char *uuid_str,
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@ -123,6 +259,9 @@ struct ffa_dev_ops {
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void (*mode_32bit_set)(struct ffa_device *dev);
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int (*sync_send_receive)(struct ffa_device *dev,
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struct ffa_send_direct_data *data);
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int (*memory_reclaim)(u64 g_handle, u32 flags);
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int (*memory_share)(struct ffa_device *dev,
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struct ffa_mem_ops_args *args);
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};
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#endif /* _LINUX_ARM_FFA_H */
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