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.
Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
---
drivers/firmware/arm_ffa/driver.c | 210 ++++++++++++++++++++++++++++++
include/linux/arm_ffa.h | 137 +++++++++++++++++++
include/uapi/linux/arm_ffa.h | 11 ++
3 files changed, 358 insertions(+)
diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index 0aa3e4d02896..6e838f2e15cb 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -29,7 +29,9 @@
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/mm.h>
#include <linux/of.h>
+#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/uuid.h>
@@ -118,6 +120,18 @@ static int ffa_version_check(u32 *version)
return 0;
}
+static int ffa_features(u32 func_id)
+{
+ ffa_res_t ret;
+
+ ret = invoke_ffa_fn(FFA_FEATURES, func_id, 0, 0, 0, 0, 0, 0);
+
+ if (ret.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)ret.a2);
+
+ return ret.a2;
+}
+
static int ffa_rx_release(void)
{
ffa_res_t ret;
@@ -215,6 +229,25 @@ static int ffa_id_get(u16 *vm_id)
return 0;
}
+static int ffa_msg_send(u16 src_id, u16 dst_id, void *buf, u32 len)
+{
+ ffa_res_t ret;
+ u32 src_dst_ids = PACK_TARGET_INFO(src_id, dst_id);
+
+ mutex_lock(&drv_info->tx_lock);
+
+ memcpy(drv_info->tx_buffer, buf, len);
+
+ ret = invoke_ffa_fn(FFA_MSG_SEND, src_dst_ids, 0, len, 0, 0, 0, 0);
+
+ mutex_unlock(&drv_info->tx_lock);
+
+ if (ret.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)ret.a2);
+
+ return 0;
+}
+
static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id,
struct ffa_send_direct_data *data)
{
@@ -241,6 +274,177 @@ static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id,
return 0;
}
+static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz,
+ u32 frag_len, u32 len, u64 *handle)
+{
+ ffa_res_t ret;
+
+ ret = invoke_ffa_fn(func_id, len, frag_len, buf, buf_sz, 0, 0, 0);
+
+ while (ret.a0 == FFA_MEM_OP_PAUSE)
+ ret = invoke_ffa_fn(FFA_MEM_OP_RESUME, ret.a1, ret.a2,
+ 0, 0, 0, 0, 0);
+ if (ret.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)ret.a2);
+
+ if (ret.a0 != FFA_SUCCESS)
+ return -EOPNOTSUPP;
+
+ if (handle)
+ *handle = PACK_HANDLE(ret.a3, ret.a2);
+
+ return frag_len;
+}
+
+static int ffa_mem_next_frag(u64 handle, u32 frag_len)
+{
+ ffa_res_t ret;
+
+ ret = invoke_ffa_fn(FFA_MEM_FRAG_TX, HANDLE_LOW(handle),
+ HANDLE_HIGH(handle), frag_len, 0, 0, 0, 0);
+
+ while (ret.a0 == FFA_MEM_OP_PAUSE)
+ ret = invoke_ffa_fn(FFA_MEM_OP_RESUME, ret.a1, ret.a2,
+ 0, 0, 0, 0, 0);
+ if (ret.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)ret.a2);
+
+ if (ret.a0 != FFA_MEM_FRAG_RX)
+ return -EOPNOTSUPP;
+
+ return ret.a3;
+}
+
+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, num_entries = sg_nents(args->sg);
+ u32 buf_sz = max_fragsize / FFA_PAGE_SIZE;
+
+ 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);
+
+ 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_res_t ret;
+
+ ret = invoke_ffa_fn(FFA_MEM_RECLAIM, HANDLE_LOW(g_handle),
+ HANDLE_HIGH(g_handle), flags, 0, 0, 0, 0);
+
+ if (ret.a0 == FFA_ERROR)
+ return ffa_to_linux_errno((int)ret.a2);
+
+ return 0;
+}
+
struct ffa_device *ffa_device_get_from_minor(int minor)
{
struct list_head *p;
@@ -346,6 +550,12 @@ ffa_dev_ioctl(struct ffa_device *ffa_dev, unsigned int ioctl, void *arg)
&kdata->data);
break;
}
+ case FFA_SHARE_MEMORY: {
+ struct ffa_mem_ops_args *kdata = arg;
+
+ r = ffa_memory_ops(FFA_MEM_SHARE, kdata);
+ break;
+ }
default:
r = -EINVAL;
}
diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
index 719ef02fe42d..12765a7926fc 100644
--- a/include/linux/arm_ffa.h
+++ b/include/linux/arm_ffa.h
@@ -88,6 +88,143 @@
#define FFA_VERSION_1_0 PACK_VERSION_INFO(1, 0)
#define FFA_MIN_VERSION FFA_VERSION_1_0
+struct ffa_mem_region_addr_range {
+ /* The base IPA of the constituent memory region, aligned to 4 kiB */
+ u64 address;
+ /* The number of 4 kiB pages in the constituent memory region. */
+ u32 pg_cnt;
+ u32 reserved;
+};
+
+struct ffa_composite_mem_region {
+ /*
+ * The total number of 4 kiB pages included in this memory region. This
+ * must be equal to the sum of page counts specified in each
+ * `struct ffa_mem_region_addr_range`.
+ */
+ u32 total_pg_cnt;
+ /* The number of constituents included in this memory region range */
+ u32 addr_range_cnt;
+ u64 reserved;
+ /** An array of `addr_range_cnt` memory region constituents. */
+ struct ffa_mem_region_addr_range constituents[];
+};
+
+struct ffa_mem_region_attributes {
+ /* The ID of the VM to which the memory is being given or shared. */
+ u16 receiver;
+ /*
+ * The permissions with which the memory region should be mapped in the
+ * receiver's page table.
+ */
+#define FFA_MEM_EXEC BIT(3)
+#define FFA_MEM_NO_EXEC BIT(2)
+#define FFA_MEM_RW BIT(1)
+#define FFA_MEM_RO BIT(0)
+ u8 attrs;
+ /*
+ * Flags used during FFA_MEM_RETRIEVE_REQ and FFA_MEM_RETRIEVE_RESP
+ * for memory regions with multiple borrowers.
+ */
+#define FFA_MEM_RETRIEVE_SELF_BORROWER BIT(0)
+ u8 flag;
+ u32 composite_off;
+ /*
+ * Offset in bytes from the start of the outer `ffa_memory_region` to
+ * an `struct ffa_mem_region_addr_range`.
+ */
+ u64 reserved;
+};
+
+struct ffa_mem_region {
+ /* The ID of the VM/owner which originally sent the memory region */
+ u16 sender_id;
+#define FFA_MEM_NORMAL BIT(5)
+#define FFA_MEM_DEVICE BIT(4)
+
+#define FFA_MEM_WRITE_BACK (3 << 2)
+#define FFA_MEM_NON_CACHEABLE (1 << 2)
+
+#define FFA_DEV_nGnRnE (0 << 2)
+#define FFA_DEV_nGnRE (1 << 2)
+#define FFA_DEV_nGRE (2 << 2)
+#define FFA_DEV_GRE (3 << 2)
+
+#define FFA_MEM_NON_SHAREABLE (0)
+#define FFA_MEM_OUTER_SHAREABLE (2)
+#define FFA_MEM_INNER_SHAREABLE (3)
+ u8 attributes;
+ u8 reserved_0;
+/*
+ * Clear memory region contents after unmapping it from the sender and
+ * before mapping it for any receiver.
+ */
+#define FFA_MEM_CLEAR BIT(0)
+/*
+ * Whether the hypervisor may time slice the memory sharing or retrieval
+ * operation.
+ */
+#define FFA_TIME_SLICE_ENABLE BIT(1)
+
+/*
+ * Whether the hypervisor should clear the memory region before the receiver
+ * relinquishes it or is aborted.
+ */
+#define FFA_MEM_CLEAR_BEFORE_RELINQUISH BIT(0)
+/*
+ * Whether the hypervisor should clear the memory region after the receiver
+ * relinquishes it or is aborted.
+ */
+#define FFA_MEM_CLEAR_AFTER_RELINQUISH BIT(2)
+
+#define FFA_MEM_RETRIEVE_TYPE_IN_RESP (0 << 3)
+#define FFA_MEM_RETRIEVE_TYPE_SHARE (1 << 3)
+#define FFA_MEM_RETRIEVE_TYPE_LEND (2 << 3)
+#define FFA_MEM_RETRIEVE_TYPE_DONATE (3 << 3)
+
+#define FFA_MEM_RETRIEVE_ADDR_ALIGN_HINT BIT(9)
+#define FFA_MEM_RETRIEVE_ADDR_ALIGN(x) ((x) << 5)
+ /* Flags to control behaviour of the transaction. */
+ u32 flags;
+#define HANDLE_LOW_MASK GENMASK_ULL(31, 0)
+#define HANDLE_HIGH_MASK GENMASK_ULL(63, 32)
+#define HANDLE_LOW(x) (u32)(FIELD_GET(HANDLE_LOW_MASK, (x)))
+#define HANDLE_HIGH(x) (u32)(FIELD_GET(HANDLE_HIGH_MASK, (x)))
+
+#define PACK_HANDLE(l, h) \
+ (FIELD_PREP(HANDLE_LOW_MASK, (l)) | FIELD_PREP(HANDLE_HIGH_MASK, (h)))
+ /*
+ * A globally-unique ID assigned by the hypervisor for a region
+ * of memory being sent between VMs.
+ */
+ u64 handle;
+ /*
+ * An implementation defined value associated with the receiver and the
+ * memory region.
+ */
+ u64 tag;
+ u32 reserved_1;
+ /*
+ * The number of `ffa_mem_region_attributes` entries included in this
+ * transaction.
+ */
+ u32 ep_count;
+ /*
+ * An array of endpoint memory access descriptors.
+ * Each one specifies a memory region offset, an endpoint and the
+ * attributes with which this memory region should be mapped in that
+ * endpoint's page table.
+ */
+ struct ffa_mem_region_attributes ep_mem_access[];
+};
+
+#define COMPOSITE_OFFSET(x) \
+ (offsetof(struct ffa_mem_region, ep_mem_access[x]))
+#define CONSTITUENTS_OFFSET(x) \
+ (offsetof(struct ffa_composite_mem_region, constituents[x]))
+#define COMPOSITE_CONSTITUENTS_OFFSET(x, y) \
+ (COMPOSITE_OFFSET(x) + CONSTITUENTS_OFFSET(y))
+
/* FFA Device/Bus related */
struct ffa_device {
diff --git a/include/uapi/linux/arm_ffa.h b/include/uapi/linux/arm_ffa.h
index 88ddddb4742f..be2cbf01e51c 100644
--- a/include/uapi/linux/arm_ffa.h
+++ b/include/uapi/linux/arm_ffa.h
@@ -47,10 +47,21 @@ struct ffa_send_recv_async {
char buffer[];
};
+struct ffa_mem_ops_args {
+ bool use_txbuf;
+ u64 tag;
+ u32 flags;
+ struct ffa_mem_region_attributes *attrs;
+ u32 nattrs;
+ struct scatterlist *sg;
+ u64 *g_handle;
+};
+
#define FFA_GET_API_VERSION _IO(FFA_BASE, 0x00)
#define FFA_GET_PARTITION_ID _IO(FFA_BASE, 0x01)
#define FFA_GET_PARTITION_INFO _IOWR(FFA_BASE, 0x02, struct ffa_part_info)
#define FFA_SEND_RECEIVE_SYNC _IOWR(FFA_BASE, 0x03, struct ffa_send_recv_sync)
#define FFA_SEND_RECEIVE_ASYNC _IOW(FFA_BASE, 0x04, struct ffa_send_recv_async)
+#define FFA_SHARE_MEMORY _IOW(FFA_BASE, 0x05, struct ffa_mem_ops_args)
#endif /*_UAPI_LINUX_ARM_FFA_H*/
--
2.25.1
