From: Jeya R <jeyr@xxxxxxxxxxxxxx>
Add support for IOCTL requests to map and unmap on DSP based on map
flags.
Signed-off-by: Jeya R <jeyr@xxxxxxxxxxxxxx>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
---
drivers/misc/fastrpc.c | 154 ++++++++++++++++++++++++++++++++++++
include/uapi/misc/fastrpc.h | 51 ++++++++++++
2 files changed, 205 insertions(+)
diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 7e1c66591716..e3253daba0f9 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -72,6 +72,8 @@
#define FASTRPC_RMID_INIT_CREATE 6
#define FASTRPC_RMID_INIT_CREATE_ATTR 7
#define FASTRPC_RMID_INIT_CREATE_STATIC 8
+#define FASTRPC_RMID_INIT_MEM_MAP 10
+#define FASTRPC_RMID_INIT_MEM_UNMAP 11
/* Protection Domain(PD) ids */
#define AUDIO_PD (0) /* also GUEST_OS PD? */
@@ -108,12 +110,29 @@ struct fastrpc_mmap_req_msg {
s32 num;
};
+struct fastrpc_mem_map_req_msg {
+ s32 pgid;
+ s32 fd;
+ s32 offset;
+ u32 flags;
+ u64 vaddrin;
+ s32 num;
+ s32 data_len;
+};
+
struct fastrpc_munmap_req_msg {
s32 pgid;
u64 vaddr;
u64 size;
};
+struct fastrpc_mem_unmap_req_msg {
+ s32 pgid;
+ s32 fd;
+ u64 vaddrin;
+ u64 len;
+};
+
struct fastrpc_msg {
int pid; /* process group id */
int tid; /* thread id */
@@ -170,6 +189,7 @@ struct fastrpc_map {
u64 size;
void *va;
u64 len;
+ u64 raddr;
struct kref refcount;
};
@@ -1493,6 +1513,134 @@ static int fastrpc_req_mmap(struct fastrpc_user *fl, char __user *argp)
return err;
}
+static int fastrpc_req_mem_unmap_impl(struct fastrpc_user *fl, struct fastrpc_mem_unmap *req)
+{
+ struct fastrpc_invoke_args args[1] = { [0] = { 0 } };
+ struct fastrpc_map *map = NULL, *m;
+ struct fastrpc_mem_unmap_req_msg req_msg = { 0 };
+ int err = 0;
+ u32 sc;
+ struct device *dev = fl->sctx->dev;
+
+ spin_lock(&fl->lock);
+ list_for_each_entry_safe(map, m, &fl->maps, node) {
+ if ((req->fd < 0 || map->fd == req->fd) && (map->raddr == req->vaddr))
+ break;
+ map = NULL;
+ }
+
+ spin_unlock(&fl->lock);
+
+ if (!map) {
+ dev_err(dev, "map not in list\n");
+ return -EINVAL;
+ }
+
+ req_msg.pgid = fl->tgid;
+ req_msg.len = map->len;
+ req_msg.vaddrin = map->raddr;
+ req_msg.fd = map->fd;
+
+ args[0].ptr = (u64) (uintptr_t) &req_msg;
+ args[0].length = sizeof(req_msg);
+
+ sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MEM_UNMAP, 1, 0);
+ err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
+ &args[0]);
+ fastrpc_map_put(map);
+ if (err)
+ dev_err(dev, "unmmap\tpt fd = %d, 0x%09llx error\n", map->fd, map->raddr);
+
+ return err;
+}
+
+static int fastrpc_req_mem_unmap(struct fastrpc_user *fl, char __user *argp)
+{
+ struct fastrpc_mem_unmap req;
+
+ if (copy_from_user(&req, argp, sizeof(req)))
+ return -EFAULT;
+
+ return fastrpc_req_mem_unmap_impl(fl, &req);
+}
+
+static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp)
+{
+ struct fastrpc_invoke_args args[4] = { [0 ... 3] = { 0 } };
+ struct fastrpc_mem_map_req_msg req_msg = { 0 };
+ struct fastrpc_mmap_rsp_msg rsp_msg = { 0 };
+ struct fastrpc_mem_unmap req_unmap = { 0 };
+ struct fastrpc_phy_page pages = { 0 };
+ struct fastrpc_mem_map req;
+ struct device *dev = fl->sctx->dev;
+ struct fastrpc_map *map = NULL;
+ int err;
+ u32 sc;
+
+ if (copy_from_user(&req, argp, sizeof(req)))
+ return -EFAULT;
+
+ /* create SMMU mapping */
+ err = fastrpc_map_create(fl, req.fd, req.length, &map);
+ if (err) {
+ dev_err(dev, "failed to map buffer, fd = %d\n", req.fd);
+ return err;
+ }
+
+ req_msg.pgid = fl->tgid;
+ req_msg.fd = req.fd;
+ req_msg.offset = req.offset;
+ req_msg.vaddrin = req.vaddrin;
+ map->va = (void *) (uintptr_t) req.vaddrin;
+ req_msg.flags = req.flags;
+ req_msg.num = sizeof(pages);
+ req_msg.data_len = 0;
+
+ args[0].ptr = (u64) (uintptr_t) &req_msg;
+ args[0].length = sizeof(req_msg);
+
+ pages.addr = map->phys;
+ pages.size = map->size;
+
+ args[1].ptr = (u64) (uintptr_t) &pages;
+ args[1].length = sizeof(pages);
+
+ args[2].ptr = (u64) (uintptr_t) &pages;
+ args[2].length = 0;
+
+ args[3].ptr = (u64) (uintptr_t) &rsp_msg;
+ args[3].length = sizeof(rsp_msg);
+
+ sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MEM_MAP, 3, 1);
+ err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc, &args[0]);
+ if (err) {
+ dev_err(dev, "mem mmap error, fd %d, vaddr %llx, size %lld\n",
+ req.fd, req.vaddrin, map->size);
+ goto err_invoke;
+ }
+
+ /* update the buffer to be able to deallocate the memory on the DSP */
+ map->raddr = rsp_msg.vaddr;
+
+ /* let the client know the address to use */
+ req.vaddrout = rsp_msg.vaddr;
+
+ if (copy_to_user((void __user *)argp, &req, sizeof(req))) {
+ /* unmap the memory and release the buffer */
+ req_unmap.vaddr = (uintptr_t) rsp_msg.vaddr;
+ req_unmap.length = map->size;
+ fastrpc_req_mem_unmap_impl(fl, &req_unmap);
+ return -EFAULT;
+ }
+
+ return 0;
+
+err_invoke:
+ fastrpc_map_put(map);
+
+ return err;
+}
+
static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
@@ -1522,6 +1670,12 @@ static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
case FASTRPC_IOCTL_MUNMAP:
err = fastrpc_req_munmap(fl, argp);
break;
+ case FASTRPC_IOCTL_MEM_MAP:
+ err = fastrpc_req_mem_map(fl, argp);
+ break;
+ case FASTRPC_IOCTL_MEM_UNMAP:
+ err = fastrpc_req_mem_unmap(fl, argp);
+ break;
default:
err = -ENOTTY;
break;
diff --git a/include/uapi/misc/fastrpc.h b/include/uapi/misc/fastrpc.h
index 0a89f95463f6..d248eeb20e67 100644
--- a/include/uapi/misc/fastrpc.h
+++ b/include/uapi/misc/fastrpc.h
@@ -13,6 +13,37 @@
#define FASTRPC_IOCTL_MMAP _IOWR('R', 6, struct fastrpc_req_mmap)
#define FASTRPC_IOCTL_MUNMAP _IOWR('R', 7, struct fastrpc_req_munmap)
#define FASTRPC_IOCTL_INIT_ATTACH_SNS _IO('R', 8)
+#define FASTRPC_IOCTL_MEM_MAP _IOWR('R', 10, struct fastrpc_mem_map)
+#define FASTRPC_IOCTL_MEM_UNMAP _IOWR('R', 11, struct fastrpc_mem_unmap)
+
+/**
+ * enum fastrpc_map_flags - control flags for mapping memory on DSP user process
+ * @FASTRPC_MAP_STATIC: Map memory pages with RW- permission and CACHE WRITEBACK.
+ * The driver is responsible for cache maintenance when passed
+ * the buffer to FastRPC calls. Same virtual address will be
+ * assigned for subsequent FastRPC calls.
+ * @FASTRPC_MAP_RESERVED: Reserved
+ * @FASTRPC_MAP_FD: Map memory pages with RW- permission and CACHE WRITEBACK.
+ * Mapping tagged with a file descriptor. User is responsible for
+ * CPU and DSP cache maintenance for the buffer. Get virtual address
+ * of buffer on DSP using HAP_mmap_get() and HAP_mmap_put() APIs.
+ * @FASTRPC_MAP_FD_DELAYED: Mapping delayed until user call HAP_mmap() and HAP_munmap()
+ * functions on DSP. It is useful to map a buffer with cache modes
+ * other than default modes. User is responsible for CPU and DSP
+ * cache maintenance for the buffer.
+ * @FASTRPC_MAP_FD_NOMAP: This flag is used to skip CPU mapping,
+ * otherwise behaves similar to FASTRPC_MAP_FD_DELAYED flag.
+ * @FASTRPC_MAP_MAX: max count for flags
+ *
+ */
+enum fastrpc_map_flags {
+ FASTRPC_MAP_STATIC = 0,
+ FASTRPC_MAP_RESERVED,
+ FASTRPC_MAP_FD = 2,
+ FASTRPC_MAP_FD_DELAYED,
+ FASTRPC_MAP_FD_NOMAP = 16,
+ FASTRPC_MAP_MAX,
+};
struct fastrpc_invoke_args {
__u64 ptr;
@@ -49,9 +80,29 @@ struct fastrpc_req_mmap {
__u64 vaddrout; /* dsp virtual address */
};
+struct fastrpc_mem_map {
+ __s32 version;
+ __s32 fd; /* fd */
+ __s32 offset; /* buffer offset */
+ __u32 flags; /* flags defined in enum fastrpc_map_flags */
+ __u64 vaddrin; /* buffer virtual address */
+ __u64 length; /* buffer length */
+ __u64 vaddrout; /* [out] remote virtual address */
+ __s32 attrs; /* buffer attributes used for SMMU mapping */
+ __s32 reserved[4];
+};
+
struct fastrpc_req_munmap {
__u64 vaddrout; /* address to unmap */
__u64 size; /* size */
};
+struct fastrpc_mem_unmap {
+ __s32 vesion;
+ __s32 fd; /* fd */
+ __u64 vaddr; /* remote process (dsp) virtual address */
+ __u64 length; /* buffer size */
+ __s32 reserved[5];
+};
+
#endif /* __QCOM_FASTRPC_H__ */
--
2.21.0
