drivers/char/adsprpc.c

/*
 * Copyright (c) 2012-2019, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */
#include <linux/dma-buf.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/completion.h>
#include <linux/pagemap.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/cdev.h>
#include <linux/list.h>
#include <linux/hash.h>
#include <linux/msm_ion.h>
#include <soc/qcom/secure_buffer.h>
#include <linux/rpmsg.h>
#include <soc/qcom/subsystem_notif.h>
#include <soc/qcom/subsystem_restart.h>
#include <soc/qcom/service-notifier.h>
#include <soc/qcom/service-locator.h>
#include <linux/scatterlist.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/device.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/dma-contiguous.h>
#include <linux/cma.h>
#include <linux/iommu.h>
#include <linux/sort.h>
#include <linux/msm_dma_iommu_mapping.h>
#include <asm/dma-iommu.h>
#include <soc/qcom/scm.h>
#include "adsprpc_compat.h"
#include "adsprpc_shared.h"
#include <soc/qcom/ramdump.h>
#include <linux/debugfs.h>
#include <linux/pm_qos.h>

#define TZ_PIL_PROTECT_MEM_SUBSYS_ID 0x0C
#define TZ_PIL_CLEAR_PROTECT_MEM_SUBSYS_ID 0x0D
#define TZ_PIL_AUTH_QDSP6_PROC 1
#define ADSP_MMAP_HEAP_ADDR 4
#define ADSP_MMAP_REMOTE_HEAP_ADDR 8
#define ADSP_MMAP_ADD_PAGES 0x1000
#define FASTRPC_DMAHANDLE_NOMAP (16)

#define FASTRPC_ENOSUCH 39
#define VMID_SSC_Q6     5
#define VMID_ADSP_Q6    6
#define DEBUGFS_SIZE 3072
#define UL_SIZE 25
#define PID_SIZE 10

#define AUDIO_PDR_SERVICE_LOCATION_CLIENT_NAME   "audio_pdr_adsprpc"
#define AUDIO_PDR_ADSP_SERVICE_NAME              "avs/audio"

#define SENSORS_PDR_SERVICE_LOCATION_CLIENT_NAME   "sensors_pdr_adsprpc"
#define SENSORS_PDR_ADSP_SERVICE_NAME              "tms/servreg"

#define RPC_TIMEOUT	(5 * HZ)
#define BALIGN		128
#define NUM_CHANNELS	4	/* adsp, mdsp, slpi, cdsp*/
#define NUM_SESSIONS	9	/*8 compute, 1 cpz*/
#define M_FDLIST	(16)
#define M_CRCLIST	(64)
#define SESSION_ID_INDEX (30)
#define FASTRPC_CTX_MAGIC (0xbeeddeed)
#define FASTRPC_CTX_MAX (256)
#define FASTRPC_CTXID_MASK (0xFF0)
#define NUM_DEVICES   2 /* adsprpc-smd, adsprpc-smd-secure */
#define MINOR_NUM_DEV 0
#define MINOR_NUM_SECURE_DEV 1
#define NON_SECURE_CHANNEL 0
#define SECURE_CHANNEL 1

#define IS_CACHE_ALIGNED(x) (((x) & ((L1_CACHE_BYTES)-1)) == 0)
#ifndef ION_FLAG_CACHED
#define ION_FLAG_CACHED (1)
#endif

#define ADSP_DOMAIN_ID (0)
#define MDSP_DOMAIN_ID (1)
#define SDSP_DOMAIN_ID (2)
#define CDSP_DOMAIN_ID (3)

#define PERF_KEYS \
	"count:flush:map:copy:rpmsg:getargs:putargs:invalidate:invoke:tid:ptr"
#define FASTRPC_STATIC_HANDLE_KERNEL (1)
#define FASTRPC_STATIC_HANDLE_LISTENER (3)
#define FASTRPC_STATIC_HANDLE_MAX (20)
#define FASTRPC_LATENCY_CTRL_ENB  (1)
#define FASTRPC_TIMEOUT (3000) /* 3s */

#define INIT_FILELEN_MAX (2*1024*1024)
#define INIT_MEMLEN_MAX  (8*1024*1024)
#define MAX_CACHE_BUF_SIZE (8*1024*1024)

#define PERF_END (void)0

#define PERF(enb, cnt, ff) \
	{\
		struct timespec startT = {0};\
		int64_t *counter = cnt;\
		if (enb && counter) {\
			getnstimeofday(&startT);\
		} \
		ff ;\
		if (enb && counter) {\
			*counter += getnstimediff(&startT);\
		} \
	}

#define GET_COUNTER(perf_ptr, offset)  \
	(perf_ptr != NULL ?\
		(((offset >= 0) && (offset < PERF_KEY_MAX)) ?\
			(int64_t *)(perf_ptr + offset)\
				: (int64_t *)NULL) : (int64_t *)NULL)

static int fastrpc_pdr_notifier_cb(struct notifier_block *nb,
					unsigned long code,
					void *data);
static struct dentry *debugfs_root;
static struct dentry *debugfs_global_file;

static inline uint64_t buf_page_start(uint64_t buf)
{
	uint64_t start = (uint64_t) buf & PAGE_MASK;
	return start;
}

static inline uint64_t buf_page_offset(uint64_t buf)
{
	uint64_t offset = (uint64_t) buf & (PAGE_SIZE - 1);
	return offset;
}

static inline uint64_t buf_num_pages(uint64_t buf, size_t len)
{
	uint64_t start = buf_page_start(buf) >> PAGE_SHIFT;
	uint64_t end = (((uint64_t) buf + len - 1) & PAGE_MASK) >> PAGE_SHIFT;
	uint64_t nPages = end - start + 1;
	return nPages;
}

static inline uint64_t buf_page_size(uint32_t size)
{
	uint64_t sz = (size + (PAGE_SIZE - 1)) & PAGE_MASK;

	return sz > PAGE_SIZE ? sz : PAGE_SIZE;
}

static inline void *uint64_to_ptr(uint64_t addr)
{
	void *ptr = (void *)((uintptr_t)addr);

	return ptr;
}

static inline uint64_t ptr_to_uint64(void *ptr)
{
	uint64_t addr = (uint64_t)((uintptr_t)ptr);

	return addr;
}

struct secure_vm {
	int *vmid;
	int *vmperm;
	int vmcount;
};

struct fastrpc_file;

struct fastrpc_buf {
	struct hlist_node hn;
	struct hlist_node hn_rem;
	struct fastrpc_file *fl;
	void *virt;
	uint64_t phys;
	size_t size;
	unsigned long dma_attr;
	uintptr_t raddr;
	uint32_t flags;
	int remote;
};

struct fastrpc_ctx_lst;

struct overlap {
	uintptr_t start;
	uintptr_t end;
	int raix;
	uintptr_t mstart;
	uintptr_t mend;
	uintptr_t offset;
};

struct smq_invoke_ctx {
	struct hlist_node hn;
	struct completion work;
	int retval;
	int pid;
	int tgid;
	remote_arg_t *lpra;
	remote_arg64_t *rpra;
	remote_arg64_t *lrpra;		/* Local copy of rpra for put_args */
	int *fds;
	unsigned int *attrs;
	struct fastrpc_mmap **maps;
	struct fastrpc_buf *buf;
	struct fastrpc_buf *lbuf;
	size_t used;
	struct fastrpc_file *fl;
	uint32_t sc;
	struct overlap *overs;
	struct overlap **overps;
	struct smq_msg msg;
	uint32_t *crc;
	unsigned int magic;
	uint64_t ctxid;
};

struct fastrpc_ctx_lst {
	struct hlist_head pending;
	struct hlist_head interrupted;
};

struct fastrpc_smmu {
	struct device *dev;
	struct dma_iommu_mapping *mapping;
	const char *dev_name;
	int cb;
	int enabled;
	int faults;
	int secure;
	int coherent;
};

struct fastrpc_session_ctx {
	struct device *dev;
	struct fastrpc_smmu smmu;
	int used;
};

struct fastrpc_static_pd {
	char *spdname;
	struct notifier_block pdrnb;
	struct notifier_block get_service_nb;
	void *pdrhandle;
	int pdrcount;
	int prevpdrcount;
	int ispdup;
	int cid;
};

struct fastrpc_channel_ctx {
	char *name;
	char *subsys;
	struct rpmsg_device *rpdev;
	struct device *dev;
	struct fastrpc_session_ctx session[NUM_SESSIONS];
	struct fastrpc_static_pd spd[NUM_SESSIONS];
	struct completion work;
	struct completion workport;
	struct notifier_block nb;
	struct mutex smd_mutex;
	struct mutex rpmsg_mutex;
	int sesscount;
	int ssrcount;
	void *handle;
	int prevssrcount;
	int issubsystemup;
	int vmid;
	struct secure_vm rhvm;
	int ramdumpenabled;
	void *remoteheap_ramdump_dev;
	/* Indicates, if channel is restricted to secure node only */
	int secure;
};

struct fastrpc_apps {
	struct fastrpc_channel_ctx *channel;
	struct cdev cdev;
	struct class *class;
	struct smq_phy_page range;
	struct hlist_head maps;
	uint32_t staticpd_flags;
	dev_t dev_no;
	int compat;
	struct hlist_head drivers;
	spinlock_t hlock;
	struct device *dev;
	unsigned int latency;
	int rpmsg_register;
	spinlock_t ctxlock;
	struct smq_invoke_ctx *ctxtable[FASTRPC_CTX_MAX];
	bool legacy_remote_heap;
};

struct fastrpc_mmap {
	struct hlist_node hn;
	struct fastrpc_file *fl;
	struct fastrpc_apps *apps;
	int fd;
	uint32_t flags;
	struct dma_buf *buf;
	struct sg_table *table;
	struct dma_buf_attachment *attach;
	struct ion_handle *handle;
	uint64_t phys;
	size_t size;
	uintptr_t va;
	size_t len;
	int refs;
	uintptr_t raddr;
	int uncached;
	int secure;
	uintptr_t attr;
};

enum fastrpc_perfkeys {
	PERF_COUNT = 0,
	PERF_FLUSH = 1,
	PERF_MAP = 2,
	PERF_COPY = 3,
	PERF_LINK = 4,
	PERF_GETARGS = 5,
	PERF_PUTARGS = 6,
	PERF_INVARGS = 7,
	PERF_INVOKE = 8,
	PERF_KEY_MAX = 9,
};

struct fastrpc_perf {
	int64_t count;
	int64_t flush;
	int64_t map;
	int64_t copy;
	int64_t link;
	int64_t getargs;
	int64_t putargs;
	int64_t invargs;
	int64_t invoke;
	int64_t tid;
	struct hlist_node hn;
};

struct fastrpc_file {
	struct hlist_node hn;
	spinlock_t hlock;
	struct hlist_head maps;
	struct hlist_head cached_bufs;
	struct hlist_head remote_bufs;
	struct fastrpc_ctx_lst clst;
	struct fastrpc_session_ctx *sctx;
	struct fastrpc_buf *init_mem;
	struct fastrpc_session_ctx *secsctx;
	uint32_t mode;
	uint32_t profile;
	int sessionid;
	int tgid;
	int cid;
	int ssrcount;
	int pd;
	char *spdname;
	int file_close;
	int dsp_process_init;
	struct fastrpc_apps *apps;
	struct hlist_head perf;
	struct dentry *debugfs_file;
	struct mutex perf_mutex;
	struct pm_qos_request pm_qos_req;
	int qos_request;
	struct mutex map_mutex;
	struct mutex internal_map_mutex;
	/* Identifies the device (MINOR_NUM_DEV / MINOR_NUM_SECURE_DEV) */
	int dev_minor;
	char *debug_buf;
};

static struct fastrpc_apps gfa;

static struct fastrpc_channel_ctx gcinfo[NUM_CHANNELS] = {
	{
		.name = "adsprpc-smd",
		.subsys = "adsp",
		.spd = {
			{
				.spdname =
					AUDIO_PDR_SERVICE_LOCATION_CLIENT_NAME,
				.pdrnb.notifier_call =
						fastrpc_pdr_notifier_cb,
				.cid = ADSP_DOMAIN_ID,
			},
			{
				.spdname =
				SENSORS_PDR_SERVICE_LOCATION_CLIENT_NAME,
				.pdrnb.notifier_call =
						fastrpc_pdr_notifier_cb,
				.cid = ADSP_DOMAIN_ID,
			}
		},
	},
	{
		.name = "mdsprpc-smd",
		.subsys = "modem",
		.spd = {
			{
				.cid = MDSP_DOMAIN_ID,
			}
		},
	},
	{
		.name = "sdsprpc-smd",
		.subsys = "slpi",
		.spd = {
			{
				.cid = SDSP_DOMAIN_ID,
			}
		},
	},
	{
		.name = "cdsprpc-smd",
		.subsys = "cdsp",
		.spd = {
			{
				.cid = CDSP_DOMAIN_ID,
			}
		},
	},
};

static int hlosvm[1] = {VMID_HLOS};
static int hlosvmperm[1] = {PERM_READ | PERM_WRITE | PERM_EXEC};

static inline int64_t getnstimediff(struct timespec *start)
{
	int64_t ns;
	struct timespec ts, b;

	getnstimeofday(&ts);
	b = timespec_sub(ts, *start);
	ns = timespec_to_ns(&b);
	return ns;
}

static inline int64_t *getperfcounter(struct fastrpc_file *fl, int key)
{
	int err = 0;
	int64_t *val = NULL;
	struct fastrpc_perf *perf = NULL, *fperf = NULL;
	struct hlist_node *n = NULL;

	VERIFY(err, !IS_ERR_OR_NULL(fl));
	if (err)
		goto bail;

	mutex_lock(&fl->perf_mutex);
	hlist_for_each_entry_safe(perf, n, &fl->perf, hn) {
		if (perf->tid == current->pid) {
			fperf = perf;
			break;
		}
	}

	if (IS_ERR_OR_NULL(fperf)) {
		fperf = kzalloc(sizeof(*fperf), GFP_KERNEL);

		VERIFY(err, !IS_ERR_OR_NULL(fperf));
		if (err) {
			mutex_unlock(&fl->perf_mutex);
			kfree(fperf);
			goto bail;
		}

		fperf->tid = current->pid;
		hlist_add_head(&fperf->hn, &fl->perf);
	}

	val = ((int64_t *)fperf) + key;
	mutex_unlock(&fl->perf_mutex);
bail:
	return val;
}


static void fastrpc_buf_free(struct fastrpc_buf *buf, int cache)
{
	struct fastrpc_file *fl = buf == NULL ? NULL : buf->fl;
	int vmid;

	if (!fl)
		return;
	if (cache && buf->size < MAX_CACHE_BUF_SIZE) {
		spin_lock(&fl->hlock);
		hlist_add_head(&buf->hn, &fl->cached_bufs);
		spin_unlock(&fl->hlock);
		return;
	}
	if (buf->remote) {
		spin_lock(&fl->hlock);
		hlist_del_init(&buf->hn_rem);
		spin_unlock(&fl->hlock);
		buf->remote = 0;
		buf->raddr = 0;
	}
	if (!IS_ERR_OR_NULL(buf->virt)) {
		int destVM[1] = {VMID_HLOS};
		int destVMperm[1] = {PERM_READ | PERM_WRITE | PERM_EXEC};

		if (fl->sctx->smmu.cb && fl->cid != SDSP_DOMAIN_ID)
			buf->phys &= ~((uint64_t)fl->sctx->smmu.cb << 32);
		vmid = fl->apps->channel[fl->cid].vmid;
		if (vmid) {
			int srcVM[2] = {VMID_HLOS, vmid};

			hyp_assign_phys(buf->phys, buf_page_size(buf->size),
				srcVM, 2, destVM, destVMperm, 1);
		}
		dma_free_attrs(fl->sctx->smmu.dev, buf->size, buf->virt,
					buf->phys, buf->dma_attr);
	}
	kfree(buf);
}

static void fastrpc_cached_buf_list_free(struct fastrpc_file *fl)
{
	struct fastrpc_buf *buf, *free;

	do {
		struct hlist_node *n;

		free = NULL;
		spin_lock(&fl->hlock);
		hlist_for_each_entry_safe(buf, n, &fl->cached_bufs, hn) {
			hlist_del_init(&buf->hn);
			free = buf;
			break;
		}
		spin_unlock(&fl->hlock);
		if (free)
			fastrpc_buf_free(free, 0);
	} while (free);
}

static void fastrpc_remote_buf_list_free(struct fastrpc_file *fl)
{
	struct fastrpc_buf *buf, *free;

	do {
		struct hlist_node *n;

		free = NULL;
		spin_lock(&fl->hlock);
		hlist_for_each_entry_safe(buf, n, &fl->remote_bufs, hn_rem) {
			free = buf;
			break;
		}
		spin_unlock(&fl->hlock);
		if (free)
			fastrpc_buf_free(free, 0);
	} while (free);
}

static void fastrpc_mmap_add(struct fastrpc_mmap *map)
{
	if (map->flags == ADSP_MMAP_HEAP_ADDR ||
				map->flags == ADSP_MMAP_REMOTE_HEAP_ADDR) {
		struct fastrpc_apps *me = &gfa;

		spin_lock(&me->hlock);
		hlist_add_head(&map->hn, &me->maps);
		spin_unlock(&me->hlock);
	} else {
		struct fastrpc_file *fl = map->fl;

		hlist_add_head(&map->hn, &fl->maps);
	}
}

static int fastrpc_mmap_find(struct fastrpc_file *fl, int fd,
		uintptr_t va, size_t len, int mflags, int refs,
		struct fastrpc_mmap **ppmap)
{
	struct fastrpc_apps *me = &gfa;
	struct fastrpc_mmap *match = NULL, *map = NULL;
	struct hlist_node *n;

	if ((va + len) < va)
		return -EOVERFLOW;
	if (mflags == ADSP_MMAP_HEAP_ADDR ||
				 mflags == ADSP_MMAP_REMOTE_HEAP_ADDR) {
		spin_lock(&me->hlock);
		hlist_for_each_entry_safe(map, n, &me->maps, hn) {
			if (va >= map->va &&
				va + len <= map->va + map->len &&
				map->fd == fd) {
				if (refs)
					map->refs++;
				match = map;
				break;
			}
		}
		spin_unlock(&me->hlock);
	} else {
		hlist_for_each_entry_safe(map, n, &fl->maps, hn) {
			if (va >= map->va &&
				va + len <= map->va + map->len &&
				map->fd == fd) {
				if (refs)
					map->refs++;
				match = map;
				break;
			}
		}
	}
	if (match) {
		*ppmap = match;
		return 0;
	}
	return -ENOTTY;
}

static int dma_alloc_memory(dma_addr_t *region_phys, void **vaddr, size_t size,
					unsigned long dma_attr)
{
	struct fastrpc_apps *me = &gfa;

	if (me->dev == NULL) {
		pr_err("device adsprpc-mem is not initialized\n");
		return -ENODEV;
	}
	*vaddr = dma_alloc_attrs(me->dev, size, region_phys,
					GFP_KERNEL, dma_attr);
	if (IS_ERR_OR_NULL(*vaddr)) {
		pr_err("adsprpc: %s: %s: dma_alloc_attrs failed for size 0x%zx, returned %ld\n",
				current->comm, __func__, size, PTR_ERR(*vaddr));
		return -ENOMEM;
	}
	return 0;
}

static int fastrpc_mmap_remove(struct fastrpc_file *fl, uintptr_t va,
			       size_t len, struct fastrpc_mmap **ppmap)
{
	struct fastrpc_mmap *match = NULL, *map;
	struct hlist_node *n;
	struct fastrpc_apps *me = &gfa;

	spin_lock(&me->hlock);
	hlist_for_each_entry_safe(map, n, &me->maps, hn) {
		if (map->raddr == va &&
			map->raddr + map->len == va + len &&
			map->refs == 1) {
			match = map;
			hlist_del_init(&map->hn);
			break;
		}
	}
	spin_unlock(&me->hlock);
	if (match) {
		*ppmap = match;
		return 0;
	}
	hlist_for_each_entry_safe(map, n, &fl->maps, hn) {
		if (map->raddr == va &&
			map->raddr + map->len == va + len &&
			map->refs == 1) {
			match = map;
			hlist_del_init(&map->hn);
			break;
		}
	}
	if (match) {
		*ppmap = match;
		return 0;
	}
	return -ENOTTY;
}

static void fastrpc_mmap_free(struct fastrpc_mmap *map, uint32_t flags)
{
	struct fastrpc_apps *me = &gfa;
	struct fastrpc_file *fl;
	int vmid;
	struct fastrpc_session_ctx *sess;

	if (!map)
		return;
	fl = map->fl;
	if (map->flags == ADSP_MMAP_HEAP_ADDR ||
				map->flags == ADSP_MMAP_REMOTE_HEAP_ADDR) {
		map->refs--;
		if (!map->refs)
			hlist_del_init(&map->hn);
		if (map->refs > 0)
			return;
	} else {
		map->refs--;
		if (!map->refs)
			hlist_del_init(&map->hn);
		if (map->refs > 0 && !flags)
			return;
	}
	if (map->flags == ADSP_MMAP_HEAP_ADDR ||
				map->flags == ADSP_MMAP_REMOTE_HEAP_ADDR) {

		if (me->dev == NULL) {
			pr_err("failed to free remote heap allocation\n");
			return;
		}
		if (map->phys) {
			dma_free_attrs(me->dev, map->size, (void *)map->va,
			(dma_addr_t)map->phys, (unsigned long)map->attr);
		}
	} else if (map->flags == FASTRPC_DMAHANDLE_NOMAP) {
		if (!IS_ERR_OR_NULL(map->table))
			dma_buf_unmap_attachment(map->attach, map->table,
					DMA_BIDIRECTIONAL);
		if (!IS_ERR_OR_NULL(map->attach))
			dma_buf_detach(map->buf, map->attach);
		if (!IS_ERR_OR_NULL(map->buf))
			dma_buf_put(map->buf);
	} else {
		int destVM[1] = {VMID_HLOS};
		int destVMperm[1] = {PERM_READ | PERM_WRITE | PERM_EXEC};

		if (map->secure)
			sess = fl->secsctx;
		else
			sess = fl->sctx;

		vmid = fl->apps->channel[fl->cid].vmid;
		if (vmid && map->phys) {
			int srcVM[2] = {VMID_HLOS, vmid};

			hyp_assign_phys(map->phys, buf_page_size(map->size),
				srcVM, 2, destVM, destVMperm, 1);
		}

		if (!IS_ERR_OR_NULL(map->table))
			dma_buf_unmap_attachment(map->attach, map->table,
					DMA_BIDIRECTIONAL);
		if (!IS_ERR_OR_NULL(map->attach))
			dma_buf_detach(map->buf, map->attach);
		if (!IS_ERR_OR_NULL(map->buf))
			dma_buf_put(map->buf);
	}
	kfree(map);
}

static int fastrpc_session_alloc(struct fastrpc_channel_ctx *chan, int secure,
					struct fastrpc_session_ctx **session);

static int fastrpc_mmap_create(struct fastrpc_file *fl, int fd,
	unsigned int attr, uintptr_t va, size_t len, int mflags,
	struct fastrpc_mmap **ppmap)
{
	struct fastrpc_apps *me = &gfa;
	struct fastrpc_session_ctx *sess;
	struct fastrpc_apps *apps = fl->apps;
	int cid = fl->cid;
	struct fastrpc_channel_ctx *chan = NULL;
	struct fastrpc_mmap *map = NULL;
	dma_addr_t region_phys = 0;
	void *region_vaddr = NULL;
	unsigned long flags;
	int err = 0, vmid, sgl_index = 0;
	struct scatterlist *sgl = NULL;

	VERIFY(err, cid >= 0 && cid < NUM_CHANNELS);
	if (err)
		goto bail;
	chan = &apps->channel[cid];

	if (!fastrpc_mmap_find(fl, fd, va, len, mflags, 1, ppmap))
		return 0;
	map = kzalloc(sizeof(*map), GFP_KERNEL);
	VERIFY(err, !IS_ERR_OR_NULL(map));
	if (err)
		goto bail;
	INIT_HLIST_NODE(&map->hn);
	map->flags = mflags;
	map->refs = 1;
	map->fl = fl;
	map->fd = fd;
	map->attr = attr;
	if (mflags == ADSP_MMAP_HEAP_ADDR ||
				mflags == ADSP_MMAP_REMOTE_HEAP_ADDR) {
		map->apps = me;
		map->fl = NULL;
		map->attr |= DMA_ATTR_SKIP_ZEROING | DMA_ATTR_NO_KERNEL_MAPPING;
		VERIFY(err, !dma_alloc_memory(&region_phys, &region_vaddr,
					len, (unsigned long) map->attr));
		if (err)
			goto bail;
		map->phys = (uintptr_t)region_phys;
		map->size = len;
		map->va = (uintptr_t)region_vaddr;
	} else if (mflags == FASTRPC_DMAHANDLE_NOMAP) {
		VERIFY(err, !IS_ERR_OR_NULL(map->buf = dma_buf_get(fd)));
		if (err)
			goto bail;
		VERIFY(err, !dma_buf_get_flags(map->buf, &flags));
		if (err)
			goto bail;
		map->secure = flags & ION_FLAG_SECURE;
		map->uncached = 1;
		map->va = 0;
		map->phys = 0;

		VERIFY(err, !IS_ERR_OR_NULL(map->attach =
				dma_buf_attach(map->buf, me->dev)));
		if (err)
			goto bail;

		map->attach->dma_map_attrs |= DMA_ATTR_SKIP_CPU_SYNC;
		VERIFY(err, !IS_ERR_OR_NULL(map->table =
			dma_buf_map_attachment(map->attach,
				DMA_BIDIRECTIONAL)));
		if (err)
			goto bail;
		VERIFY(err, map->table->nents == 1);
		if (err)
			goto bail;
		map->phys = sg_dma_address(map->table->sgl);
	} else {
		if (map->attr && (map->attr & FASTRPC_ATTR_KEEP_MAP)) {
			pr_info("adsprpc: buffer mapped with persist attr %x\n",
				(unsigned int)map->attr);
			map->refs = 2;
		}
		VERIFY(err, !IS_ERR_OR_NULL(map->buf = dma_buf_get(fd)));
		if (err)
			goto bail;
		VERIFY(err, !dma_buf_get_flags(map->buf, &flags));
		if (err)
			goto bail;

		map->secure = flags & ION_FLAG_SECURE;
		if (map->secure) {
			if (!fl->secsctx)
				err = fastrpc_session_alloc(chan, 1,
							&fl->secsctx);
			if (err)
				goto bail;
		}
		if (map->secure)
			sess = fl->secsctx;
		else
			sess = fl->sctx;

		VERIFY(err, !IS_ERR_OR_NULL(sess));
		if (err)
			goto bail;

		map->uncached = !(flags & ION_FLAG_CACHED);
		if (map->attr & FASTRPC_ATTR_NOVA && !sess->smmu.coherent)
			map->uncached = 1;

		VERIFY(err, !IS_ERR_OR_NULL(map->attach =
				dma_buf_attach(map->buf, sess->smmu.dev)));
		if (err)
			goto bail;

		map->attach->dma_map_attrs |= DMA_ATTR_DELAYED_UNMAP;
		map->attach->dma_map_attrs |= DMA_ATTR_EXEC_MAPPING;
		if (map->attr & FASTRPC_ATTR_NON_COHERENT ||
			(sess->smmu.coherent && map->uncached))
			map->attach->dma_map_attrs |=
				DMA_ATTR_FORCE_NON_COHERENT |
				DMA_ATTR_SKIP_CPU_SYNC;
		else if (map->attr & FASTRPC_ATTR_COHERENT)
			map->attach->dma_map_attrs |= DMA_ATTR_FORCE_COHERENT;

		VERIFY(err, !IS_ERR_OR_NULL(map->table =
			dma_buf_map_attachment(map->attach,
				DMA_BIDIRECTIONAL)));
		if (err)
			goto bail;
		if (!sess->smmu.enabled) {
			VERIFY(err, map->table->nents == 1);
			if (err)
				goto bail;
		}
		map->phys = sg_dma_address(map->table->sgl);

		if (sess->smmu.cb) {
			if (fl->cid != SDSP_DOMAIN_ID)
				map->phys += ((uint64_t)sess->smmu.cb << 32);
			for_each_sg(map->table->sgl, sgl, map->table->nents,
				sgl_index)
				map->size += sg_dma_len(sgl);
		} else {
			map->size = buf_page_size(len);
		}

		vmid = fl->apps->channel[fl->cid].vmid;
		if (!sess->smmu.enabled && !vmid) {
			VERIFY(err, map->phys >= me->range.addr &&
			map->phys + map->size <=
			me->range.addr + me->range.size);
			if (err) {
				pr_err("adsprpc: %s: phys addr 0x%llx (size 0x%zx) out of CMA heap range\n",
					__func__, map->phys, map->size);
				goto bail;
			}
		}
		if (vmid) {
			int srcVM[1] = {VMID_HLOS};
			int destVM[2] = {VMID_HLOS, vmid};
			int destVMperm[2] = {PERM_READ | PERM_WRITE,
					PERM_READ | PERM_WRITE | PERM_EXEC};

			VERIFY(err, !hyp_assign_phys(map->phys,
					buf_page_size(map->size),
					srcVM, 1, destVM, destVMperm, 2));
			if (err)
				goto bail;
		}
		map->va = va;
	}
	map->len = len;

	fastrpc_mmap_add(map);
	*ppmap = map;

bail:
	if (err && map)
		fastrpc_mmap_free(map, 0);
	return err;
}

static int fastrpc_buf_alloc(struct fastrpc_file *fl, size_t size,
			unsigned long dma_attr, uint32_t rflags,
			int remote, struct fastrpc_buf **obuf)
{
	int err = 0, vmid;
	struct fastrpc_buf *buf = NULL, *fr = NULL;
	struct hlist_node *n;

	VERIFY(err, size > 0);
	if (err)
		goto bail;

	if (!remote) {
		/* find the smallest buffer that fits in the cache */
		spin_lock(&fl->hlock);
		hlist_for_each_entry_safe(buf, n, &fl->cached_bufs, hn) {
			if (buf->size >= size && (!fr || fr->size > buf->size))
				fr = buf;
		}
		if (fr)
			hlist_del_init(&fr->hn);
		spin_unlock(&fl->hlock);
		if (fr) {
			*obuf = fr;
			return 0;
		}
	}

	buf = NULL;
	VERIFY(err, NULL != (buf = kzalloc(sizeof(*buf), GFP_KERNEL)));
	if (err)
		goto bail;
	INIT_HLIST_NODE(&buf->hn);
	buf->fl = fl;
	buf->virt = NULL;
	buf->phys = 0;
	buf->size = size;
	buf->dma_attr = dma_attr;
	buf->flags = rflags;
	buf->raddr = 0;
	buf->remote = 0;
	buf->virt = dma_alloc_attrs(fl->sctx->smmu.dev, buf->size,
						(dma_addr_t *)&buf->phys,
						GFP_KERNEL, buf->dma_attr);
	if (IS_ERR_OR_NULL(buf->virt)) {
		/* free cache and retry */
		fastrpc_cached_buf_list_free(fl);
		buf->virt = dma_alloc_attrs(fl->sctx->smmu.dev, buf->size,
					(dma_addr_t *)&buf->phys, GFP_KERNEL,
					buf->dma_attr);
		VERIFY(err, !IS_ERR_OR_NULL(buf->virt));
	}
	if (err) {
		err = -ENOMEM;
		pr_err("adsprpc: %s: %s: dma_alloc_attrs failed for size 0x%zx, returned %ld\n",
			current->comm, __func__, size, PTR_ERR(buf->virt));
		goto bail;
	}
	if (fl->sctx->smmu.cb && fl->cid != SDSP_DOMAIN_ID)
		buf->phys += ((uint64_t)fl->sctx->smmu.cb << 32);
	vmid = fl->apps->channel[fl->cid].vmid;
	if (vmid) {
		int srcVM[1] = {VMID_HLOS};
		int destVM[2] = {VMID_HLOS, vmid};
		int destVMperm[2] = {PERM_READ | PERM_WRITE,
					PERM_READ | PERM_WRITE | PERM_EXEC};

		VERIFY(err, !hyp_assign_phys(buf->phys, buf_page_size(size),
			srcVM, 1, destVM, destVMperm, 2));
		if (err)
			goto bail;
	}

	if (remote) {
		INIT_HLIST_NODE(&buf->hn_rem);
		spin_lock(&fl->hlock);
		hlist_add_head(&buf->hn_rem, &fl->remote_bufs);
		spin_unlock(&fl->hlock);
		buf->remote = remote;
	}
	*obuf = buf;
 bail:
	if (err && buf)
		fastrpc_buf_free(buf, 0);
	return err;
}


static int context_restore_interrupted(struct fastrpc_file *fl,
				       struct fastrpc_ioctl_invoke_crc *inv,
				       struct smq_invoke_ctx **po)
{
	int err = 0;
	struct smq_invoke_ctx *ctx = NULL, *ictx = NULL;
	struct hlist_node *n;
	struct fastrpc_ioctl_invoke *invoke = &inv->inv;

	spin_lock(&fl->hlock);
	hlist_for_each_entry_safe(ictx, n, &fl->clst.interrupted, hn) {
		if (ictx->pid == current->pid) {
			if (invoke->sc != ictx->sc || ictx->fl != fl)
				err = -1;
			else {
				ctx = ictx;
				hlist_del_init(&ctx->hn);
				hlist_add_head(&ctx->hn, &fl->clst.pending);
			}
			break;
		}
	}
	spin_unlock(&fl->hlock);
	if (ctx)
		*po = ctx;
	return err;
}

#define CMP(aa, bb) ((aa) == (bb) ? 0 : (aa) < (bb) ? -1 : 1)
static int overlap_ptr_cmp(const void *a, const void *b)
{
	struct overlap *pa = *((struct overlap **)a);
	struct overlap *pb = *((struct overlap **)b);
	/* sort with lowest starting buffer first */
	int st = CMP(pa->start, pb->start);
	/* sort with highest ending buffer first */
	int ed = CMP(pb->end, pa->end);
	return st == 0 ? ed : st;
}

static int context_build_overlap(struct smq_invoke_ctx *ctx)
{
	int i, err = 0;
	remote_arg_t *lpra = ctx->lpra;
	int inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
	int outbufs = REMOTE_SCALARS_OUTBUFS(ctx->sc);
	int nbufs = inbufs + outbufs;
	struct overlap max;

	for (i = 0; i < nbufs; ++i) {
		ctx->overs[i].start = (uintptr_t)lpra[i].buf.pv;
		ctx->overs[i].end = ctx->overs[i].start + lpra[i].buf.len;
		if (lpra[i].buf.len) {
			VERIFY(err, ctx->overs[i].end > ctx->overs[i].start);
			if (err)
				goto bail;
		}
		ctx->overs[i].raix = i;
		ctx->overps[i] = &ctx->overs[i];
	}
	sort(ctx->overps, nbufs, sizeof(*ctx->overps), overlap_ptr_cmp, NULL);
	max.start = 0;
	max.end = 0;
	for (i = 0; i < nbufs; ++i) {
		if (ctx->overps[i]->start < max.end) {
			ctx->overps[i]->mstart = max.end;
			ctx->overps[i]->mend = ctx->overps[i]->end;
			ctx->overps[i]->offset = max.end -
				ctx->overps[i]->start;
			if (ctx->overps[i]->end > max.end) {
				max.end = ctx->overps[i]->end;
			} else {
				ctx->overps[i]->mend = 0;
				ctx->overps[i]->mstart = 0;
			}
		} else  {
			ctx->overps[i]->mend = ctx->overps[i]->end;
			ctx->overps[i]->mstart = ctx->overps[i]->start;
			ctx->overps[i]->offset = 0;
			max = *ctx->overps[i];
		}
	}
bail:
	return err;
}

#define K_COPY_FROM_USER(err, kernel, dst, src, size) \
	do {\
		if (!(kernel))\
			VERIFY(err, 0 == copy_from_user((dst),\
			(void const __user *)(src),\
							(size)));\
		else\
			memmove((dst), (src), (size));\
	} while (0)

#define K_COPY_TO_USER(err, kernel, dst, src, size) \
	do {\
		if (!(kernel))\
			VERIFY(err, 0 == copy_to_user((void __user *)(dst),\
						(src), (size)));\
		else\
			memmove((dst), (src), (size));\
	} while (0)


static void context_free(struct smq_invoke_ctx *ctx);

static int context_alloc(struct fastrpc_file *fl, uint32_t kernel,
			 struct fastrpc_ioctl_invoke_crc *invokefd,
			 struct smq_invoke_ctx **po)
{
	struct fastrpc_apps *me = &gfa;
	int err = 0, bufs, ii, size = 0;
	struct smq_invoke_ctx *ctx = NULL;
	struct fastrpc_ctx_lst *clst = &fl->clst;
	struct fastrpc_ioctl_invoke *invoke = &invokefd->inv;

	bufs = REMOTE_SCALARS_LENGTH(invoke->sc);
	size = bufs * sizeof(*ctx->lpra) + bufs * sizeof(*ctx->maps) +
		sizeof(*ctx->fds) * (bufs) +
		sizeof(*ctx->attrs) * (bufs) +
		sizeof(*ctx->overs) * (bufs) +
		sizeof(*ctx->overps) * (bufs);

	VERIFY(err, NULL != (ctx = kzalloc(sizeof(*ctx) + size, GFP_KERNEL)));
	if (err)
		goto bail;

	INIT_HLIST_NODE(&ctx->hn);
	hlist_add_fake(&ctx->hn);
	ctx->fl = fl;
	ctx->maps = (struct fastrpc_mmap **)(&ctx[1]);
	ctx->lpra = (remote_arg_t *)(&ctx->maps[bufs]);
	ctx->fds = (int *)(&ctx->lpra[bufs]);
	ctx->attrs = (unsigned int *)(&ctx->fds[bufs]);
	ctx->overs = (struct overlap *)(&ctx->attrs[bufs]);
	ctx->overps = (struct overlap **)(&ctx->overs[bufs]);

	K_COPY_FROM_USER(err, kernel, (void *)ctx->lpra, invoke->pra,
					bufs * sizeof(*ctx->lpra));
	if (err)
		goto bail;

	if (invokefd->fds) {
		K_COPY_FROM_USER(err, kernel, ctx->fds, invokefd->fds,
						bufs * sizeof(*ctx->fds));
		if (err)
			goto bail;
	} else {
		ctx->fds = NULL;
	}
	if (invokefd->attrs) {
		K_COPY_FROM_USER(err, kernel, ctx->attrs, invokefd->attrs,
						bufs * sizeof(*ctx->attrs));
		if (err)
			goto bail;
	}
	ctx->crc = (uint32_t *)invokefd->crc;
	ctx->sc = invoke->sc;
	if (bufs) {
		VERIFY(err, 0 == context_build_overlap(ctx));
		if (err)
			goto bail;
	}
	ctx->retval = -1;
	ctx->pid = current->pid;
	ctx->tgid = fl->tgid;
	init_completion(&ctx->work);
	ctx->magic = FASTRPC_CTX_MAGIC;

	spin_lock(&fl->hlock);
	hlist_add_head(&ctx->hn, &clst->pending);
	spin_unlock(&fl->hlock);

	spin_lock(&me->ctxlock);
	for (ii = 0; ii < FASTRPC_CTX_MAX; ii++) {
		if (!me->ctxtable[ii]) {
			me->ctxtable[ii] = ctx;
			ctx->ctxid = (ptr_to_uint64(ctx) & ~0xFFF)|(ii << 4);
			break;
		}
	}
	spin_unlock(&me->ctxlock);
	VERIFY(err, ii < FASTRPC_CTX_MAX);
	if (err) {
		pr_err("adsprpc: out of context memory\n");
		goto bail;
	}

	*po = ctx;
bail:
	if (ctx && err)
		context_free(ctx);
	return err;
}

static void context_save_interrupted(struct smq_invoke_ctx *ctx)
{
	struct fastrpc_ctx_lst *clst = &ctx->fl->clst;

	spin_lock(&ctx->fl->hlock);
	hlist_del_init(&ctx->hn);
	hlist_add_head(&ctx->hn, &clst->interrupted);
	spin_unlock(&ctx->fl->hlock);
}

static void context_free(struct smq_invoke_ctx *ctx)
{
	int i;
	struct fastrpc_apps *me = &gfa;
	int nbufs = REMOTE_SCALARS_INBUFS(ctx->sc) +
		    REMOTE_SCALARS_OUTBUFS(ctx->sc);
	spin_lock(&ctx->fl->hlock);
	hlist_del_init(&ctx->hn);
	spin_unlock(&ctx->fl->hlock);
	mutex_lock(&ctx->fl->map_mutex);
	for (i = 0; i < nbufs; ++i)
		fastrpc_mmap_free(ctx->maps[i], 0);
	mutex_unlock(&ctx->fl->map_mutex);
	fastrpc_buf_free(ctx->buf, 1);
	fastrpc_buf_free(ctx->lbuf, 1);
	ctx->magic = 0;
	ctx->ctxid = 0;

	spin_lock(&me->ctxlock);
	for (i = 0; i < FASTRPC_CTX_MAX; i++) {
		if (me->ctxtable[i] == ctx) {
			me->ctxtable[i] = NULL;
			break;
		}
	}
	spin_unlock(&me->ctxlock);

	kfree(ctx);
}

static void context_notify_user(struct smq_invoke_ctx *ctx, int retval)
{
	ctx->retval = retval;
	complete(&ctx->work);
}


static void fastrpc_notify_users(struct fastrpc_file *me)
{
	struct smq_invoke_ctx *ictx;
	struct hlist_node *n;

	spin_lock(&me->hlock);
	hlist_for_each_entry_safe(ictx, n, &me->clst.pending, hn) {
		complete(&ictx->work);
	}
	hlist_for_each_entry_safe(ictx, n, &me->clst.interrupted, hn) {
		complete(&ictx->work);
	}
	spin_unlock(&me->hlock);

}


static void fastrpc_notify_users_staticpd_pdr(struct fastrpc_file *me)
{
	struct smq_invoke_ctx *ictx;
	struct hlist_node *n;

	spin_lock(&me->hlock);
	hlist_for_each_entry_safe(ictx, n, &me->clst.pending, hn) {
		if (ictx->msg.pid)
			complete(&ictx->work);
	}
	hlist_for_each_entry_safe(ictx, n, &me->clst.interrupted, hn) {
		if (ictx->msg.pid)
			complete(&ictx->work);
	}
	spin_unlock(&me->hlock);
}


static void fastrpc_notify_drivers(struct fastrpc_apps *me, int cid)
{
	struct fastrpc_file *fl;
	struct hlist_node *n;

	spin_lock(&me->hlock);
	hlist_for_each_entry_safe(fl, n, &me->drivers, hn) {
		if (fl->cid == cid)
			fastrpc_notify_users(fl);
	}
	spin_unlock(&me->hlock);

}

static void fastrpc_notify_pdr_drivers(struct fastrpc_apps *me, char *spdname)
{
	struct fastrpc_file *fl;
	struct hlist_node *n;

	spin_lock(&me->hlock);
	hlist_for_each_entry_safe(fl, n, &me->drivers, hn) {
		if (fl->spdname && !strcmp(spdname, fl->spdname))
			fastrpc_notify_users_staticpd_pdr(fl);
	}
	spin_unlock(&me->hlock);

}

static void context_list_ctor(struct fastrpc_ctx_lst *me)
{
	INIT_HLIST_HEAD(&me->interrupted);
	INIT_HLIST_HEAD(&me->pending);
}

static void fastrpc_context_list_dtor(struct fastrpc_file *fl)
{
	struct fastrpc_ctx_lst *clst = &fl->clst;
	struct smq_invoke_ctx *ictx = NULL, *ctxfree;
	struct hlist_node *n;

	do {
		ctxfree = NULL;
		spin_lock(&fl->hlock);
		hlist_for_each_entry_safe(ictx, n, &clst->interrupted, hn) {
			hlist_del_init(&ictx->hn);
			ctxfree = ictx;
			break;
		}
		spin_unlock(&fl->hlock);
		if (ctxfree)
			context_free(ctxfree);
	} while (ctxfree);
	do {
		ctxfree = NULL;
		spin_lock(&fl->hlock);
		hlist_for_each_entry_safe(ictx, n, &clst->pending, hn) {
			hlist_del_init(&ictx->hn);
			ctxfree = ictx;
			break;
		}
		spin_unlock(&fl->hlock);
		if (ctxfree)
			context_free(ctxfree);
	} while (ctxfree);
}

static int fastrpc_file_free(struct fastrpc_file *fl);
static void fastrpc_file_list_dtor(struct fastrpc_apps *me)
{
	struct fastrpc_file *fl, *free;
	struct hlist_node *n;

	do {
		free = NULL;
		spin_lock(&me->hlock);
		hlist_for_each_entry_safe(fl, n, &me->drivers, hn) {
			hlist_del_init(&fl->hn);
			free = fl;
			break;
		}
		spin_unlock(&me->hlock);
		if (free)
			fastrpc_file_free(free);
	} while (free);
}

static int get_args(uint32_t kernel, struct smq_invoke_ctx *ctx)
{
	remote_arg64_t *rpra, *lrpra;
	remote_arg_t *lpra = ctx->lpra;
	struct smq_invoke_buf *list;
	struct smq_phy_page *pages, *ipage;
	uint32_t sc = ctx->sc;
	int inbufs = REMOTE_SCALARS_INBUFS(sc);
	int outbufs = REMOTE_SCALARS_OUTBUFS(sc);
	int handles, bufs = inbufs + outbufs;
	uintptr_t args;
	size_t rlen = 0, copylen = 0, metalen = 0, lrpralen = 0;
	int i, oix;
	int err = 0;
	int mflags = 0;
	uint64_t *fdlist;
	uint32_t *crclist;
	int64_t *perf_counter = getperfcounter(ctx->fl, PERF_COUNT);

	/* calculate size of the metadata */
	rpra = NULL;
	list = smq_invoke_buf_start(rpra, sc);
	pages = smq_phy_page_start(sc, list);
	ipage = pages;

	PERF(ctx->fl->profile, GET_COUNTER(perf_counter, PERF_MAP),
	for (i = 0; i < bufs; ++i) {
		uintptr_t buf = (uintptr_t)lpra[i].buf.pv;
		size_t len = lpra[i].buf.len;

		mutex_lock(&ctx->fl->map_mutex);
		if (ctx->fds && (ctx->fds[i] != -1))
			fastrpc_mmap_create(ctx->fl, ctx->fds[i],
					ctx->attrs[i], buf, len,
					mflags, &ctx->maps[i]);
		mutex_unlock(&ctx->fl->map_mutex);
		ipage += 1;
	}
	PERF_END);
	handles = REMOTE_SCALARS_INHANDLES(sc) + REMOTE_SCALARS_OUTHANDLES(sc);
	mutex_lock(&ctx->fl->map_mutex);
	for (i = bufs; i < bufs + handles; i++) {
		int dmaflags = 0;

		if (ctx->attrs && (ctx->attrs[i] & FASTRPC_ATTR_NOMAP))
			dmaflags = FASTRPC_DMAHANDLE_NOMAP;
		VERIFY(err, !fastrpc_mmap_create(ctx->fl, ctx->fds[i],
				FASTRPC_ATTR_NOVA, 0, 0, dmaflags,
				&ctx->maps[i]));
		if (err) {
			mutex_unlock(&ctx->fl->map_mutex);
			goto bail;
		}
		ipage += 1;
	}
	mutex_unlock(&ctx->fl->map_mutex);
	metalen = copylen = (size_t)&ipage[0] + (sizeof(uint64_t) * M_FDLIST) +
				 (sizeof(uint32_t) * M_CRCLIST);

	/* allocate new local rpra buffer */
	lrpralen = (size_t)&list[0];
	if (lrpralen) {
		err = fastrpc_buf_alloc(ctx->fl, lrpralen, 0, 0, 0, &ctx->lbuf);
		if (err)
			goto bail;
	}
	if (ctx->lbuf->virt)
		memset(ctx->lbuf->virt, 0, lrpralen);

	lrpra = ctx->lbuf->virt;
	ctx->lrpra = lrpra;

	/* calculate len required for copying */
	for (oix = 0; oix < inbufs + outbufs; ++oix) {
		int i = ctx->overps[oix]->raix;
		uintptr_t mstart, mend;
		size_t len = lpra[i].buf.len;

		if (!len)
			continue;
		if (ctx->maps[i])
			continue;
		if (ctx->overps[oix]->offset == 0)
			copylen = ALIGN(copylen, BALIGN);
		mstart = ctx->overps[oix]->mstart;
		mend = ctx->overps[oix]->mend;
		VERIFY(err, (mend - mstart) <= LONG_MAX);
		if (err)
			goto bail;
		copylen += mend - mstart;
		VERIFY(err, copylen >= 0);
		if (err)
			goto bail;
	}
	ctx->used = copylen;

	/* allocate new buffer */
	if (copylen) {
		err = fastrpc_buf_alloc(ctx->fl, copylen, 0, 0, 0, &ctx->buf);
		if (err)
			goto bail;
	}
	if (ctx->buf->virt && metalen <= copylen)
		memset(ctx->buf->virt, 0, metalen);

	/* copy metadata */
	rpra = ctx->buf->virt;
	ctx->rpra = rpra;
	list = smq_invoke_buf_start(rpra, sc);
	pages = smq_phy_page_start(sc, list);
	ipage = pages;
	args = (uintptr_t)ctx->buf->virt + metalen;
	for (i = 0; i < bufs + handles; ++i) {
		if (lpra[i].buf.len)
			list[i].num = 1;
		else
			list[i].num = 0;
		list[i].pgidx = ipage - pages;
		ipage++;
	}

	/* map ion buffers */
	PERF(ctx->fl->profile, GET_COUNTER(perf_counter, PERF_MAP),
	for (i = 0; rpra && lrpra && i < inbufs + outbufs; ++i) {
		struct fastrpc_mmap *map = ctx->maps[i];
		uint64_t buf = ptr_to_uint64(lpra[i].buf.pv);
		size_t len = lpra[i].buf.len;

		rpra[i].buf.pv = lrpra[i].buf.pv = 0;
		rpra[i].buf.len = lrpra[i].buf.len = len;
		if (!len)
			continue;
		if (map) {
			struct vm_area_struct *vma;
			uintptr_t offset;
			uint64_t num = buf_num_pages(buf, len);
			int idx = list[i].pgidx;

			if (map->attr & FASTRPC_ATTR_NOVA) {
				offset = 0;
			} else {
				down_read(&current->mm->mmap_sem);
				VERIFY(err, NULL != (vma = find_vma(current->mm,
								map->va)));
				if (err) {
					up_read(&current->mm->mmap_sem);
					goto bail;
				}
				offset = buf_page_start(buf) - vma->vm_start;
				up_read(&current->mm->mmap_sem);
				VERIFY(err, offset < (uintptr_t)map->size);
				if (err)
					goto bail;
			}
			pages[idx].addr = map->phys + offset;
			pages[idx].size = num << PAGE_SHIFT;
		}
		rpra[i].buf.pv = lrpra[i].buf.pv = buf;
	}
	PERF_END);
	for (i = bufs; i < bufs + handles; ++i) {
		struct fastrpc_mmap *map = ctx->maps[i];

		pages[i].addr = map->phys;
		pages[i].size = map->size;
	}
	fdlist = (uint64_t *)&pages[bufs + handles];
	for (i = 0; i < M_FDLIST; i++)
		fdlist[i] = 0;
	crclist = (uint32_t *)&fdlist[M_FDLIST];
	memset(crclist, 0, sizeof(uint32_t)*M_CRCLIST);

	/* copy non ion buffers */
	PERF(ctx->fl->profile, GET_COUNTER(perf_counter, PERF_COPY),
	rlen = copylen - metalen;
	for (oix = 0; rpra && lrpra && oix < inbufs + outbufs; ++oix) {
		int i = ctx->overps[oix]->raix;
		struct fastrpc_mmap *map = ctx->maps[i];
		size_t mlen;
		uint64_t buf;
		size_t len = lpra[i].buf.len;

		if (!len)
			continue;
		if (map)
			continue;
		if (ctx->overps[oix]->offset == 0) {
			rlen -= ALIGN(args, BALIGN) - args;
			args = ALIGN(args, BALIGN);
		}
		mlen = ctx->overps[oix]->mend - ctx->overps[oix]->mstart;
		VERIFY(err, rlen >= mlen);
		if (err)
			goto bail;
		rpra[i].buf.pv = lrpra[i].buf.pv =
			 (args - ctx->overps[oix]->offset);
		pages[list[i].pgidx].addr = ctx->buf->phys -
					    ctx->overps[oix]->offset +
					    (copylen - rlen);
		pages[list[i].pgidx].addr =
			buf_page_start(pages[list[i].pgidx].addr);
		buf = rpra[i].buf.pv;
		pages[list[i].pgidx].size = buf_num_pages(buf, len) * PAGE_SIZE;
		if (i < inbufs) {
			K_COPY_FROM_USER(err, kernel, uint64_to_ptr(buf),
					lpra[i].buf.pv, len);
			if (err)
				goto bail;
		}
		args = args + mlen;
		rlen -= mlen;
	}
	PERF_END);

	PERF(ctx->fl->profile, GET_COUNTER(perf_counter, PERF_FLUSH),
	for (oix = 0; oix < inbufs + outbufs; ++oix) {
		int i = ctx->overps[oix]->raix;
		struct fastrpc_mmap *map = ctx->maps[i];

		if (map && map->uncached)
			continue;
		if (ctx->fl->sctx->smmu.coherent &&
			!(map && (map->attr & FASTRPC_ATTR_NON_COHERENT)))
			continue;
		if (map && (map->attr & FASTRPC_ATTR_COHERENT))
			continue;

		if (rpra && lrpra && rpra[i].buf.len &&
			ctx->overps[oix]->mstart) {
			if (map && map->buf) {
				dma_buf_begin_cpu_access(map->buf,
					DMA_BIDIRECTIONAL);
				dma_buf_end_cpu_access(map->buf,
					DMA_BIDIRECTIONAL);
			} else
				dmac_flush_range(uint64_to_ptr(rpra[i].buf.pv),
					uint64_to_ptr(rpra[i].buf.pv
						+ rpra[i].buf.len));
		}
	}
	PERF_END);
	for (i = bufs; rpra && lrpra && i < bufs + handles; i++) {
		rpra[i].dma.fd = lrpra[i].dma.fd = ctx->fds[i];
		rpra[i].dma.len = lrpra[i].dma.len = (uint32_t)lpra[i].buf.len;
		rpra[i].dma.offset = lrpra[i].dma.offset =
			 (uint32_t)(uintptr_t)lpra[i].buf.pv;
	}

 bail:
	return err;
}

static int put_args(uint32_t kernel, struct smq_invoke_ctx *ctx,
		    remote_arg_t *upra)
{
	uint32_t sc = ctx->sc;
	struct smq_invoke_buf *list;
	struct smq_phy_page *pages;
	struct fastrpc_mmap *mmap;
	uint64_t *fdlist;
	uint32_t *crclist = NULL;

	remote_arg64_t *rpra = ctx->lrpra;
	int i, inbufs, outbufs, handles;
	int err = 0;

	inbufs = REMOTE_SCALARS_INBUFS(sc);
	outbufs = REMOTE_SCALARS_OUTBUFS(sc);
	handles = REMOTE_SCALARS_INHANDLES(sc) + REMOTE_SCALARS_OUTHANDLES(sc);
	list = smq_invoke_buf_start(ctx->rpra, sc);
	pages = smq_phy_page_start(sc, list);
	fdlist = (uint64_t *)(pages + inbufs + outbufs + handles);
	crclist = (uint32_t *)(fdlist + M_FDLIST);

	for (i = inbufs; i < inbufs + outbufs; ++i) {
		if (!ctx->maps[i]) {
			K_COPY_TO_USER(err, kernel,
				ctx->lpra[i].buf.pv,
				uint64_to_ptr(rpra[i].buf.pv),
				rpra[i].buf.len);
			if (err)
				goto bail;
		} else {
			mutex_lock(&ctx->fl->map_mutex);
			fastrpc_mmap_free(ctx->maps[i], 0);
			mutex_unlock(&ctx->fl->map_mutex);
			ctx->maps[i] = NULL;
		}
	}
	mutex_lock(&ctx->fl->map_mutex);
	if (inbufs + outbufs + handles) {
		for (i = 0; i < M_FDLIST; i++) {
			if (!fdlist[i])
				break;
			if (!fastrpc_mmap_find(ctx->fl, (int)fdlist[i], 0, 0,
						0, 0, &mmap))
				fastrpc_mmap_free(mmap, 0);
		}
	}
	mutex_unlock(&ctx->fl->map_mutex);
	if (ctx->crc && crclist && rpra)
		K_COPY_TO_USER(err, kernel, ctx->crc,
			crclist, M_CRCLIST*sizeof(uint32_t));

 bail:
	return err;
}

static void inv_args_pre(struct smq_invoke_ctx *ctx)
{
	int i, inbufs, outbufs;
	uint32_t sc = ctx->sc;
	remote_arg64_t *rpra = ctx->rpra;
	uintptr_t end;

	inbufs = REMOTE_SCALARS_INBUFS(sc);
	outbufs = REMOTE_SCALARS_OUTBUFS(sc);
	for (i = inbufs; i < inbufs + outbufs; ++i) {
		struct fastrpc_mmap *map = ctx->maps[i];

		if (map && map->uncached)
			continue;
		if (!rpra[i].buf.len)
			continue;
		if (ctx->fl->sctx->smmu.coherent &&
			!(map && (map->attr & FASTRPC_ATTR_NON_COHERENT)))
			continue;
		if (map && (map->attr & FASTRPC_ATTR_COHERENT))
			continue;

		if (buf_page_start(ptr_to_uint64((void *)rpra)) ==
				buf_page_start(rpra[i].buf.pv))
			continue;
		if (!IS_CACHE_ALIGNED((uintptr_t)
				uint64_to_ptr(rpra[i].buf.pv))) {
			if (map && map->buf) {
				dma_buf_begin_cpu_access(map->buf,
					DMA_BIDIRECTIONAL);
				dma_buf_end_cpu_access(map->buf,
					DMA_BIDIRECTIONAL);
			} else
				dmac_flush_range(
					uint64_to_ptr(rpra[i].buf.pv), (char *)
					uint64_to_ptr(rpra[i].buf.pv + 1));
		}

		end = (uintptr_t)uint64_to_ptr(rpra[i].buf.pv +
							rpra[i].buf.len);
		if (!IS_CACHE_ALIGNED(end)) {
			if (map && map->buf) {
				dma_buf_begin_cpu_access(map->buf,
					DMA_BIDIRECTIONAL);
				dma_buf_end_cpu_access(map->buf,
					DMA_BIDIRECTIONAL);
			} else
				dmac_flush_range((char *)end,
					(char *)end + 1);
		}
	}
}

static void inv_args(struct smq_invoke_ctx *ctx)
{
	int i, inbufs, outbufs;
	uint32_t sc = ctx->sc;
	remote_arg64_t *rpra = ctx->lrpra;

	inbufs = REMOTE_SCALARS_INBUFS(sc);
	outbufs = REMOTE_SCALARS_OUTBUFS(sc);
	for (i = inbufs; i < inbufs + outbufs; ++i) {
		struct fastrpc_mmap *map = ctx->maps[i];

		if (map && map->uncached)
			continue;
		if (!rpra[i].buf.len)
			continue;
		if (ctx->fl->sctx->smmu.coherent &&
			!(map && (map->attr & FASTRPC_ATTR_NON_COHERENT)))
			continue;
		if (map && (map->attr & FASTRPC_ATTR_COHERENT))
			continue;

		if (buf_page_start(ptr_to_uint64((void *)rpra)) ==
				buf_page_start(rpra[i].buf.pv)) {
			continue;
		}
		if (map && map->buf) {
			dma_buf_begin_cpu_access(map->buf,
				DMA_BIDIRECTIONAL);
			dma_buf_end_cpu_access(map->buf,
				DMA_BIDIRECTIONAL);
		} else
			dmac_inv_range((char *)uint64_to_ptr(rpra[i].buf.pv),
				(char *)uint64_to_ptr(rpra[i].buf.pv
						 + rpra[i].buf.len));
	}

}

static int fastrpc_invoke_send(struct smq_invoke_ctx *ctx,
			       uint32_t kernel, uint32_t handle)
{
	struct smq_msg *msg = &ctx->msg;
	struct fastrpc_file *fl = ctx->fl;
	struct fastrpc_channel_ctx *channel_ctx = &fl->apps->channel[fl->cid];
	int err = 0;

	mutex_lock(&channel_ctx->smd_mutex);
	msg->pid = fl->tgid;
	msg->tid = current->pid;
	if (fl->sessionid)
		msg->tid |= (1 << SESSION_ID_INDEX);
	if (kernel)
		msg->pid = 0;
	msg->invoke.header.ctx = ctx->ctxid | fl->pd;
	msg->invoke.header.handle = handle;
	msg->invoke.header.sc = ctx->sc;
	msg->invoke.page.addr = ctx->buf ? ctx->buf->phys : 0;
	msg->invoke.page.size = buf_page_size(ctx->used);

	if (fl->ssrcount != channel_ctx->ssrcount) {
		err = -ECONNRESET;
		mutex_unlock(&channel_ctx->smd_mutex);
		goto bail;
	}
	mutex_unlock(&channel_ctx->smd_mutex);

	mutex_lock(&channel_ctx->rpmsg_mutex);
	VERIFY(err, !IS_ERR_OR_NULL(channel_ctx->rpdev));
	if (err) {
		err = -ECONNRESET;
		mutex_unlock(&channel_ctx->rpmsg_mutex);
		goto bail;
	}
	err = rpmsg_send(channel_ctx->rpdev->ept, (void *)msg, sizeof(*msg));
	mutex_unlock(&channel_ctx->rpmsg_mutex);
 bail:
	return err;
}

static void fastrpc_init(struct fastrpc_apps *me)
{
	int i;

	INIT_HLIST_HEAD(&me->drivers);
	INIT_HLIST_HEAD(&me->maps);
	spin_lock_init(&me->hlock);
	spin_lock_init(&me->ctxlock);
	me->channel = &gcinfo[0];
	for (i = 0; i < NUM_CHANNELS; i++) {
		init_completion(&me->channel[i].work);
		init_completion(&me->channel[i].workport);
		me->channel[i].sesscount = 0;
		/* All channels are secure by default except CDSP */
		me->channel[i].secure = SECURE_CHANNEL;
		mutex_init(&me->channel[i].smd_mutex);
		mutex_init(&me->channel[i].rpmsg_mutex);
	}
	/* Set CDSP channel to non secure */
	me->channel[CDSP_DOMAIN_ID].secure = NON_SECURE_CHANNEL;
}

static int fastrpc_release_current_dsp_process(struct fastrpc_file *fl);

static int fastrpc_internal_invoke(struct fastrpc_file *fl, uint32_t mode,
				   uint32_t kernel,
				   struct fastrpc_ioctl_invoke_crc *inv)
{
	struct smq_invoke_ctx *ctx = NULL;
	struct fastrpc_ioctl_invoke *invoke = &inv->inv;
	int cid = fl->cid;
	int interrupted = 0;
	int err = 0;
	struct timespec invoket = {0};
	int64_t *perf_counter = getperfcounter(fl, PERF_COUNT);

	if (fl->profile)
		getnstimeofday(&invoket);

	if (!kernel) {
		VERIFY(err, invoke->handle != FASTRPC_STATIC_HANDLE_KERNEL);
		if (err) {
			pr_err("adsprpc: ERROR: %s: user application %s trying to send a kernel RPC message to channel %d",
				__func__, current->comm, cid);
			goto bail;
		}
	}

	VERIFY(err, fl->sctx != NULL);
	if (err)
		goto bail;
	VERIFY(err, fl->cid >= 0 && fl->cid < NUM_CHANNELS);
	if (err)
		goto bail;

	if (!kernel) {
		VERIFY(err, 0 == context_restore_interrupted(fl, inv,
								&ctx));
		if (err)
			goto bail;
		if (fl->sctx->smmu.faults)
			err = FASTRPC_ENOSUCH;
		if (err)
			goto bail;
		if (ctx)
			goto wait;
	}

	VERIFY(err, 0 == context_alloc(fl, kernel, inv, &ctx));
	if (err)
		goto bail;

	if (REMOTE_SCALARS_LENGTH(ctx->sc)) {
		PERF(fl->profile, GET_COUNTER(perf_counter, PERF_GETARGS),
		VERIFY(err, 0 == get_args(kernel, ctx));
		PERF_END);
		if (err)
			goto bail;
	}

	if (!fl->sctx->smmu.coherent) {
		PERF(fl->profile, GET_COUNTER(perf_counter, PERF_INVARGS),
		inv_args_pre(ctx);
		PERF_END);
	}

	PERF(fl->profile, GET_COUNTER(perf_counter, PERF_LINK),
	VERIFY(err, 0 == fastrpc_invoke_send(ctx, kernel, invoke->handle));
	PERF_END);

	if (err)
		goto bail;
 wait:
	if (kernel) {
		int rc = wait_for_completion_timeout(&ctx->work,
				msecs_to_jiffies(FASTRPC_TIMEOUT));
		if (!rc) {
			pr_err("wait for completion timeout and trigger ADSP SSR b/132430192\n");
			/* b/132430192 WA to trigger adsp SSR */
			subsystem_restart("adsp");
			goto bail;
		}
	} else {
		interrupted = wait_for_completion_interruptible(&ctx->work);
		VERIFY(err, 0 == (err = interrupted));
		if (err)
			goto bail;
	}

	PERF(fl->profile, GET_COUNTER(perf_counter, PERF_INVARGS),
	if (!fl->sctx->smmu.coherent)
		inv_args(ctx);
	PERF_END);

	VERIFY(err, 0 == (err = ctx->retval));
	if (err)
		goto bail;

	PERF(fl->profile, GET_COUNTER(perf_counter, PERF_PUTARGS),
	VERIFY(err, 0 == put_args(kernel, ctx, invoke->pra));
	PERF_END);
	if (err)
		goto bail;
 bail:
	if (ctx && interrupted == -ERESTARTSYS)
		context_save_interrupted(ctx);
	else if (ctx)
		context_free(ctx);
	if (fl->ssrcount != fl->apps->channel[cid].ssrcount)
		err = ECONNRESET;

	if (fl->profile && !interrupted) {
		if (invoke->handle != FASTRPC_STATIC_HANDLE_LISTENER) {
			int64_t *count = GET_COUNTER(perf_counter, PERF_INVOKE);

			if (count)
				*count += getnstimediff(&invoket);
		}
		if (invoke->handle > FASTRPC_STATIC_HANDLE_MAX) {
			int64_t *count = GET_COUNTER(perf_counter, PERF_COUNT);

			if (count)
				*count = *count+1;
		}
	}
	return err;
}

static int fastrpc_get_adsp_session(char *name, int *session)
{
	struct fastrpc_apps *me = &gfa;
	int err = 0, i;

	for (i = 0; i < NUM_SESSIONS; i++) {
		if (!me->channel[0].spd[i].spdname)
			continue;
		if (!strcmp(name, me->channel[0].spd[i].spdname))
			break;
	}
	VERIFY(err, i < NUM_SESSIONS);
	if (err)
		goto bail;
	*session = i;
bail:
	return err;
}

static int fastrpc_mmap_remove_pdr(struct fastrpc_file *fl);
static int fastrpc_channel_open(struct fastrpc_file *fl);
static int fastrpc_mmap_remove_ssr(struct fastrpc_file *fl);
static int fastrpc_init_process(struct fastrpc_file *fl,
				struct fastrpc_ioctl_init_attrs *uproc)
{
	int err = 0;
	struct fastrpc_apps *me = &gfa;
	struct fastrpc_ioctl_invoke_crc ioctl;
	struct fastrpc_ioctl_init *init = &uproc->init;
	struct smq_phy_page pages[1];
	struct fastrpc_mmap *file = NULL, *mem = NULL;
	struct fastrpc_buf *imem = NULL;
	unsigned long imem_dma_attr = 0;
	char *proc_name = NULL;

	VERIFY(err, 0 == (err = fastrpc_channel_open(fl)));
	if (err)
		goto bail;
	if (init->flags == FASTRPC_INIT_ATTACH ||
			init->flags == FASTRPC_INIT_ATTACH_SENSORS) {
		remote_arg_t ra[1];
		int tgid = fl->tgid;

		ra[0].buf.pv = (void *)&tgid;
		ra[0].buf.len = sizeof(tgid);
		ioctl.inv.handle = FASTRPC_STATIC_HANDLE_KERNEL;
		ioctl.inv.sc = REMOTE_SCALARS_MAKE(0, 1, 0);
		ioctl.inv.pra = ra;
		ioctl.fds = NULL;
		ioctl.attrs = NULL;
		ioctl.crc = NULL;
		if (init->flags == FASTRPC_INIT_ATTACH)
			fl->pd = 0;
		else if (init->flags == FASTRPC_INIT_ATTACH_SENSORS) {
			fl->spdname = SENSORS_PDR_SERVICE_LOCATION_CLIENT_NAME;
			fl->pd = 2;
		}
		VERIFY(err, !(err = fastrpc_internal_invoke(fl,
			FASTRPC_MODE_PARALLEL, 1, &ioctl)));
		if (err)
			goto bail;
	} else if (init->flags == FASTRPC_INIT_CREATE) {
		int memlen;

		remote_arg_t ra[6];
		int fds[6];
		int mflags = 0;
		struct {
			int pgid;
			unsigned int namelen;
			unsigned int filelen;
			unsigned int pageslen;
			int attrs;
			int siglen;
		} inbuf;

		inbuf.pgid = fl->tgid;
		inbuf.namelen = strlen(current->comm) + 1;
		inbuf.filelen = init->filelen;
		fl->pd = 1;

		VERIFY(err, access_ok(0, (void __user *)init->file,
			init->filelen));
		if (err)
			goto bail;
		if (init->filelen) {
			mutex_lock(&fl->map_mutex);
			VERIFY(err, !fastrpc_mmap_create(fl, init->filefd, 0,
				init->file, init->filelen, mflags, &file));
			mutex_unlock(&fl->map_mutex);
			if (err)
				goto bail;
		}
		inbuf.pageslen = 1;

		VERIFY(err, !init->mem);
		if (err) {
			err = -EINVAL;
			pr_err("adsprpc: %s: %s: ERROR: donated memory allocated in userspace\n",
				current->comm, __func__);
			goto bail;
		}
		memlen = ALIGN(max(1024*1024*3, (int)init->filelen * 4),
						1024*1024);
		imem_dma_attr = DMA_ATTR_EXEC_MAPPING |
						DMA_ATTR_DELAYED_UNMAP |
						DMA_ATTR_NO_KERNEL_MAPPING |
						DMA_ATTR_FORCE_NON_COHERENT;
		err = fastrpc_buf_alloc(fl, memlen, imem_dma_attr, 0, 0, &imem);
		if (err)
			goto bail;
		fl->init_mem = imem;

		inbuf.pageslen = 1;
		ra[0].buf.pv = (void *)&inbuf;
		ra[0].buf.len = sizeof(inbuf);
		fds[0] = -1;

		ra[1].buf.pv = (void *)current->comm;
		ra[1].buf.len = inbuf.namelen;
		fds[1] = -1;

		ra[2].buf.pv = (void *)init->file;
		ra[2].buf.len = inbuf.filelen;
		fds[2] = init->filefd;

		pages[0].addr = imem->phys;
		pages[0].size = imem->size;
		ra[3].buf.pv = (void *)pages;
		ra[3].buf.len = 1 * sizeof(*pages);
		fds[3] = -1;

		inbuf.attrs = uproc->attrs;
		ra[4].buf.pv = (void *)&(inbuf.attrs);
		ra[4].buf.len = sizeof(inbuf.attrs);
		fds[4] = -1;

		inbuf.siglen = uproc->siglen;
		ra[5].buf.pv = (void *)&(inbuf.siglen);
		ra[5].buf.len = sizeof(inbuf.siglen);
		fds[5] = -1;

		ioctl.inv.handle = FASTRPC_STATIC_HANDLE_KERNEL;
		ioctl.inv.sc = REMOTE_SCALARS_MAKE(6, 4, 0);
		if (uproc->attrs)
			ioctl.inv.sc = REMOTE_SCALARS_MAKE(7, 6, 0);
		ioctl.inv.pra = ra;
		ioctl.fds = fds;
		ioctl.attrs = NULL;
		ioctl.crc = NULL;
		VERIFY(err, !(err = fastrpc_internal_invoke(fl,
			FASTRPC_MODE_PARALLEL, 1, &ioctl)));
		if (err)
			goto bail;
	} else if (init->flags == FASTRPC_INIT_CREATE_STATIC) {
		remote_arg_t ra[3];
		uint64_t phys = 0;
		size_t size = 0;
		int fds[3];
		struct {
			int pgid;
			unsigned int namelen;
			unsigned int pageslen;
		} inbuf;

		if (!init->filelen)
			goto bail;

		proc_name = kzalloc(init->filelen, GFP_KERNEL);
		VERIFY(err, !IS_ERR_OR_NULL(proc_name));
		if (err)
			goto bail;
		VERIFY(err, 0 == copy_from_user((void *)proc_name,
			(void __user *)init->file, init->filelen));
		if (err)
			goto bail;

		fl->pd = 1;
		inbuf.pgid = current->tgid;
		inbuf.namelen = init->filelen;
		inbuf.pageslen = 0;

		if (!strcmp(proc_name, "audiopd")) {
			fl->spdname = AUDIO_PDR_SERVICE_LOCATION_CLIENT_NAME;
			VERIFY(err, !fastrpc_mmap_remove_pdr(fl));
			if (err)
				goto bail;
		}

		if (!me->staticpd_flags && !(me->legacy_remote_heap)) {
			inbuf.pageslen = 1;
			mutex_lock(&fl->map_mutex);
			VERIFY(err, !fastrpc_mmap_create(fl, -1, 0, init->mem,
				 init->memlen, ADSP_MMAP_REMOTE_HEAP_ADDR,
				 &mem));
			mutex_unlock(&fl->map_mutex);
			if (err)
				goto bail;
			phys = mem->phys;
			size = mem->size;
			if (me->channel[fl->cid].rhvm.vmid) {
				VERIFY(err, !hyp_assign_phys(phys,
					(uint64_t)size, hlosvm, 1,
					me->channel[fl->cid].rhvm.vmid,
					me->channel[fl->cid].rhvm.vmperm,
					me->channel[fl->cid].rhvm.vmcount));
				if (err) {
					pr_err("ADSPRPC: hyp_assign_phys fail err %d",
								 err);
					pr_err("map->phys 0x%llx, map->size %d\n",
							 phys, (int)size);
					goto bail;
				}
			}
			me->staticpd_flags = 1;
		}

		ra[0].buf.pv = (void *)&inbuf;
		ra[0].buf.len = sizeof(inbuf);
		fds[0] = -1;

		ra[1].buf.pv = (void *)proc_name;
		ra[1].buf.len = inbuf.namelen;
		fds[1] = -1;

		pages[0].addr = phys;
		pages[0].size = size;

		ra[2].buf.pv = (void *)pages;
		ra[2].buf.len = sizeof(*pages);
		fds[2] = -1;
		ioctl.inv.handle = FASTRPC_STATIC_HANDLE_KERNEL;

		ioctl.inv.sc = REMOTE_SCALARS_MAKE(8, 3, 0);
		ioctl.inv.pra = ra;
		ioctl.fds = NULL;
		ioctl.attrs = NULL;
		ioctl.crc = NULL;
		VERIFY(err, !(err = fastrpc_internal_invoke(fl,
			FASTRPC_MODE_PARALLEL, 1, &ioctl)));
		if (err)
			goto bail;
	} else {
		err = -ENOTTY;
		goto bail;
	}
	fl->dsp_process_init = 1;
bail:
	kfree(proc_name);
	if (err && (init->flags == FASTRPC_INIT_CREATE_STATIC))
		me->staticpd_flags = 0;
	if (mem && err) {
		if (mem->flags == ADSP_MMAP_REMOTE_HEAP_ADDR
			&& me->channel[fl->cid].rhvm.vmid)
			hyp_assign_phys(mem->phys, (uint64_t)mem->size,
					me->channel[fl->cid].rhvm.vmid,
					me->channel[fl->cid].rhvm.vmcount,
					hlosvm, hlosvmperm, 1);
		mutex_lock(&fl->map_mutex);
		fastrpc_mmap_free(mem, 0);
		mutex_unlock(&fl->map_mutex);
	}
	if (file) {
		mutex_lock(&fl->map_mutex);
		fastrpc_mmap_free(file, 0);
		mutex_unlock(&fl->map_mutex);
	}
	return err;
}

static int fastrpc_release_current_dsp_process(struct fastrpc_file *fl)
{
	int err = 0;
	struct fastrpc_ioctl_invoke_crc ioctl;
	remote_arg_t ra[1];
	int tgid = 0;

	VERIFY(err, fl->cid >= 0 && fl->cid < NUM_CHANNELS);
	if (err)
		goto bail;
	VERIFY(err, fl->sctx != NULL);
	if (err)
		goto bail;
	VERIFY(err, fl->apps->channel[fl->cid].rpdev != NULL);
	if (err)
		goto bail;
	VERIFY(err, fl->apps->channel[fl->cid].issubsystemup == 1);
	if (err)
		goto bail;
	tgid = fl->tgid;
	ra[0].buf.pv = (void *)&tgid;
	ra[0].buf.len = sizeof(tgid);
	ioctl.inv.handle = FASTRPC_STATIC_HANDLE_KERNEL;
	ioctl.inv.sc = REMOTE_SCALARS_MAKE(1, 1, 0);
	ioctl.inv.pra = ra;
	ioctl.fds = NULL;
	ioctl.attrs = NULL;
	ioctl.crc = NULL;
	VERIFY(err, 0 == (err = fastrpc_internal_invoke(fl,
		FASTRPC_MODE_PARALLEL, 1, &ioctl)));
	if (err && fl->dsp_process_init)
		pr_err("adsprpc: %s: releasing DSP process failed for %s, returned 0x%x",
					__func__, current->comm, err);
bail:
	return err;
}

static int fastrpc_mmap_on_dsp(struct fastrpc_file *fl, uint32_t flags,
					uintptr_t va, uint64_t phys,
					size_t size, uintptr_t *raddr)
{
	struct fastrpc_ioctl_invoke_crc ioctl;
	struct fastrpc_apps *me = &gfa;
	struct smq_phy_page page;
	int num = 1;
	remote_arg_t ra[3];
	int err = 0;
	struct {
		int pid;
		uint32_t flags;
		uintptr_t vaddrin;
		int num;
	} inargs;
	struct {
		uintptr_t vaddrout;
	} routargs;

	inargs.pid = fl->tgid;
	inargs.vaddrin = (uintptr_t)va;
	inargs.flags = flags;
	inargs.num = fl->apps->compat ? num * sizeof(page) : num;
	ra[0].buf.pv = (void *)&inargs;
	ra[0].buf.len = sizeof(inargs);
	page.addr = phys;
	page.size = size;
	ra[1].buf.pv = (void *)&page;
	ra[1].buf.len = num * sizeof(page);

	ra[2].buf.pv = (void *)&routargs;
	ra[2].buf.len = sizeof(routargs);

	ioctl.inv.handle = FASTRPC_STATIC_HANDLE_KERNEL;
	if (fl->apps->compat)
		ioctl.inv.sc = REMOTE_SCALARS_MAKE(4, 2, 1);
	else
		ioctl.inv.sc = REMOTE_SCALARS_MAKE(2, 2, 1);
	ioctl.inv.pra = ra;
	ioctl.fds = NULL;
	ioctl.attrs = NULL;
	ioctl.crc = NULL;
	VERIFY(err, 0 == (err = fastrpc_internal_invoke(fl,
		FASTRPC_MODE_PARALLEL, 1, &ioctl)));
	*raddr = (uintptr_t)routargs.vaddrout;
	if (err)
		goto bail;
	if (flags == ADSP_MMAP_HEAP_ADDR) {
		struct scm_desc desc = {0};

		desc.args[0] = TZ_PIL_AUTH_QDSP6_PROC;
		desc.args[1] = phys;
		desc.args[2] = size;
		desc.arginfo = SCM_ARGS(3);
		err = scm_call2(SCM_SIP_FNID(SCM_SVC_PIL,
			TZ_PIL_PROTECT_MEM_SUBSYS_ID), &desc);
	} else if (flags == ADSP_MMAP_REMOTE_HEAP_ADDR
				&& me->channel[fl->cid].rhvm.vmid) {
		VERIFY(err, !hyp_assign_phys(phys, (uint64_t)size,
				hlosvm, 1, me->channel[fl->cid].rhvm.vmid,
				me->channel[fl->cid].rhvm.vmperm,
				me->channel[fl->cid].rhvm.vmcount));
		if (err)
			goto bail;
	}
bail:
	return err;
}

static int fastrpc_munmap_on_dsp_rh(struct fastrpc_file *fl, uint64_t phys,
						size_t size, uint32_t flags)
{
	int err = 0;
	struct fastrpc_apps *me = &gfa;
	int tgid = 0;
	int destVM[1] = {VMID_HLOS};
	int destVMperm[1] = {PERM_READ | PERM_WRITE | PERM_EXEC};

	if (flags == ADSP_MMAP_HEAP_ADDR) {
		struct fastrpc_ioctl_invoke_crc ioctl;
		struct scm_desc desc = {0};
		remote_arg_t ra[2];
		int err = 0;
		struct {
			uint8_t skey;
		} routargs;

		if (fl == NULL)
			goto bail;
		tgid = fl->tgid;
		ra[0].buf.pv = (void *)&tgid;
		ra[0].buf.len = sizeof(tgid);

		ra[1].buf.pv = (void *)&routargs;
		ra[1].buf.len = sizeof(routargs);

		ioctl.inv.handle = FASTRPC_STATIC_HANDLE_KERNEL;
		ioctl.inv.sc = REMOTE_SCALARS_MAKE(9, 1, 1);
		ioctl.inv.pra = ra;
		ioctl.fds = NULL;
		ioctl.attrs = NULL;
		ioctl.crc = NULL;

		VERIFY(err, 0 == (err = fastrpc_internal_invoke(fl,
				FASTRPC_MODE_PARALLEL, 1, &ioctl)));
		if (err)
			goto bail;
		desc.args[0] = TZ_PIL_AUTH_QDSP6_PROC;
		desc.args[1] = phys;
		desc.args[2] = size;
		desc.args[3] = routargs.skey;
		desc.arginfo = SCM_ARGS(4);
		err = scm_call2(SCM_SIP_FNID(SCM_SVC_PIL,
			TZ_PIL_CLEAR_PROTECT_MEM_SUBSYS_ID), &desc);
	} else if (flags == ADSP_MMAP_REMOTE_HEAP_ADDR) {
		if (me->channel[fl->cid].rhvm.vmid) {
			VERIFY(err, !hyp_assign_phys(phys,
					(uint64_t)size,
					me->channel[fl->cid].rhvm.vmid,
					me->channel[fl->cid].rhvm.vmcount,
					destVM, destVMperm, 1));
			if (err)
				goto bail;
		}
	}

bail:
	return err;
}

static int fastrpc_munmap_on_dsp(struct fastrpc_file *fl, uintptr_t raddr,
				uint64_t phys, size_t size, uint32_t flags)
{
	struct fastrpc_ioctl_invoke_crc ioctl;
	remote_arg_t ra[1];
	int err = 0;
	struct {
		int pid;
		uintptr_t vaddrout;
		size_t size;
	} inargs;

	inargs.pid = fl->tgid;
	inargs.size = size;
	inargs.vaddrout = raddr;
	ra[0].buf.pv = (void *)&inargs;
	ra[0].buf.len = sizeof(inargs);

	ioctl.inv.handle = FASTRPC_STATIC_HANDLE_KERNEL;
	if (fl->apps->compat)
		ioctl.inv.sc = REMOTE_SCALARS_MAKE(5, 1, 0);
	else
		ioctl.inv.sc = REMOTE_SCALARS_MAKE(3, 1, 0);
	ioctl.inv.pra = ra;
	ioctl.fds = NULL;
	ioctl.attrs = NULL;
	ioctl.crc = NULL;
	VERIFY(err, 0 == (err = fastrpc_internal_invoke(fl,
		FASTRPC_MODE_PARALLEL, 1, &ioctl)));
	if (err)
		goto bail;
	if (flags == ADSP_MMAP_HEAP_ADDR ||
				flags == ADSP_MMAP_REMOTE_HEAP_ADDR) {
		VERIFY(err, !fastrpc_munmap_on_dsp_rh(fl, phys, size, flags));
		if (err)
			goto bail;
	}
bail:
	return err;
}

static int fastrpc_mmap_remove_ssr(struct fastrpc_file *fl)
{
	struct fastrpc_mmap *match = NULL, *map = NULL;
	struct hlist_node *n = NULL;
	int err = 0, ret = 0;
	struct fastrpc_apps *me = &gfa;
	struct ramdump_segment *ramdump_segments_rh = NULL;

	do {
		match = NULL;
		spin_lock(&me->hlock);
		hlist_for_each_entry_safe(map, n, &me->maps, hn) {
			match = map;
			hlist_del_init(&map->hn);
			break;
		}
		spin_unlock(&me->hlock);

		if (match) {
			VERIFY(err, !fastrpc_munmap_on_dsp_rh(fl, match->phys,
						match->size, match->flags));
			if (err)
				goto bail;
			if (me->channel[0].ramdumpenabled) {
				ramdump_segments_rh = kcalloc(1,
				sizeof(struct ramdump_segment), GFP_KERNEL);
				if (ramdump_segments_rh) {
					ramdump_segments_rh->address =
					match->phys;
					ramdump_segments_rh->size = match->size;
					ret = do_elf_ramdump(
					 me->channel[0].remoteheap_ramdump_dev,
					 ramdump_segments_rh, 1);
					if (ret < 0)
						pr_err("ADSPRPC: unable to dump heap");
					kfree(ramdump_segments_rh);
				}
			}
			fastrpc_mmap_free(match, 0);
		}
	} while (match);
bail:
	if (err && match)
		fastrpc_mmap_add(match);
	return err;
}

static int fastrpc_mmap_remove_pdr(struct fastrpc_file *fl)
{
	struct fastrpc_apps *me = &gfa;
	int session = 0, err = 0;

	VERIFY(err, !fastrpc_get_adsp_session(
			AUDIO_PDR_SERVICE_LOCATION_CLIENT_NAME, &session));
	if (err)
		goto bail;
	if (me->channel[fl->cid].spd[session].pdrcount !=
		me->channel[fl->cid].spd[session].prevpdrcount) {
		if (fastrpc_mmap_remove_ssr(fl))
			pr_err("ADSPRPC: SSR: Failed to unmap remote heap\n");
		me->channel[fl->cid].spd[session].prevpdrcount =
				me->channel[fl->cid].spd[session].pdrcount;
	}
	if (!me->channel[fl->cid].spd[session].ispdup) {
		VERIFY(err, 0);
		if (err) {
			err = -ENOTCONN;
			goto bail;
		}
	}
bail:
	return err;
}

static int fastrpc_mmap_remove(struct fastrpc_file *fl, uintptr_t va,
			     size_t len, struct fastrpc_mmap **ppmap);

static void fastrpc_mmap_add(struct fastrpc_mmap *map);

static inline void get_fastrpc_ioctl_mmap_64(
			struct fastrpc_ioctl_mmap_64 *mmap64,
			struct fastrpc_ioctl_mmap *immap)
{
	immap->fd = mmap64->fd;
	immap->flags = mmap64->flags;
	immap->vaddrin = (uintptr_t)mmap64->vaddrin;
	immap->size = mmap64->size;
}

static inline void put_fastrpc_ioctl_mmap_64(
			struct fastrpc_ioctl_mmap_64 *mmap64,
			struct fastrpc_ioctl_mmap *immap)
{
	mmap64->vaddrout = (uint64_t)immap->vaddrout;
}

static inline void get_fastrpc_ioctl_munmap_64(
			struct fastrpc_ioctl_munmap_64 *munmap64,
			struct fastrpc_ioctl_munmap *imunmap)
{
	imunmap->vaddrout = (uintptr_t)munmap64->vaddrout;
	imunmap->size = munmap64->size;
}

static int fastrpc_internal_munmap(struct fastrpc_file *fl,
				   struct fastrpc_ioctl_munmap *ud)
{
	int err = 0;
	struct fastrpc_mmap *map = NULL;
	struct fastrpc_buf *rbuf = NULL, *free = NULL;
	struct hlist_node *n;

	mutex_lock(&fl->internal_map_mutex);

	spin_lock(&fl->hlock);
	hlist_for_each_entry_safe(rbuf, n, &fl->remote_bufs, hn_rem) {
		if (rbuf->raddr && (rbuf->flags == ADSP_MMAP_ADD_PAGES)) {
			if ((rbuf->raddr == ud->vaddrout) &&
				(rbuf->size == ud->size)) {
				free = rbuf;
				break;
			}
		}
	}
	spin_unlock(&fl->hlock);

	if (free) {
		VERIFY(err, !fastrpc_munmap_on_dsp(fl, free->raddr,
			free->phys, free->size, free->flags));
		if (err)
			goto bail;
		fastrpc_buf_free(rbuf, 0);
		mutex_unlock(&fl->internal_map_mutex);
		return err;
	}

	mutex_lock(&fl->map_mutex);
	VERIFY(err, !fastrpc_mmap_remove(fl, ud->vaddrout, ud->size, &map));
	mutex_unlock(&fl->map_mutex);
	if (err)
		goto bail;
	VERIFY(err, !fastrpc_munmap_on_dsp(fl, map->raddr,
				map->phys, map->size, map->flags));
	if (err)
		goto bail;
	mutex_lock(&fl->map_mutex);
	fastrpc_mmap_free(map, 0);
	mutex_unlock(&fl->map_mutex);
bail:
	if (err && map) {
		mutex_lock(&fl->map_mutex);
		fastrpc_mmap_add(map);
		mutex_unlock(&fl->map_mutex);
	}
	mutex_unlock(&fl->internal_map_mutex);
	return err;
}

static int fastrpc_internal_munmap_fd(struct fastrpc_file *fl,
				struct fastrpc_ioctl_munmap_fd *ud)
{
	int err = 0;
	struct fastrpc_mmap *map = NULL;

	VERIFY(err, (fl && ud));
	if (err)
		goto bail;
	mutex_lock(&fl->map_mutex);
	if (fastrpc_mmap_find(fl, ud->fd, ud->va, ud->len, 0, 0, &map)) {
		pr_err("adsprpc: mapping not found to unmap fd 0x%x, va 0x%llx, len 0x%x\n",
			ud->fd, (unsigned long long)ud->va,
			(unsigned int)ud->len);
		err = -1;
		mutex_unlock(&fl->map_mutex);
		goto bail;
	}
	if (map)
		fastrpc_mmap_free(map, 0);
	mutex_unlock(&fl->map_mutex);
bail:
	return err;
}


static int fastrpc_internal_mmap(struct fastrpc_file *fl,
				 struct fastrpc_ioctl_mmap *ud)
{
	struct fastrpc_mmap *map = NULL;
	struct fastrpc_buf *rbuf = NULL;
	unsigned long dma_attr = 0;
	uintptr_t raddr = 0;
	int err = 0;

	mutex_lock(&fl->internal_map_mutex);
	if (ud->flags == ADSP_MMAP_ADD_PAGES) {
		if (ud->vaddrin) {
			err = -EINVAL;
			pr_err("adsprpc: %s: %s: ERROR: adding user allocated pages is not supported\n",
					current->comm, __func__);
			goto bail;
		}
		dma_attr = DMA_ATTR_EXEC_MAPPING |
					DMA_ATTR_DELAYED_UNMAP |
					DMA_ATTR_NO_KERNEL_MAPPING |
					DMA_ATTR_FORCE_NON_COHERENT;
		err = fastrpc_buf_alloc(fl, ud->size, dma_attr, ud->flags,
								1, &rbuf);
		if (err)
			goto bail;
		err = fastrpc_mmap_on_dsp(fl, ud->flags, 0,
				rbuf->phys, rbuf->size, &raddr);
		if (err)
			goto bail;
		rbuf->raddr = raddr;
	} else {
		uintptr_t va_to_dsp;

		mutex_lock(&fl->map_mutex);
		VERIFY(err, !fastrpc_mmap_create(fl, ud->fd, 0,
				(uintptr_t)ud->vaddrin, ud->size,
				 ud->flags, &map));
		mutex_unlock(&fl->map_mutex);
		if (err)
			goto bail;

		if (ud->flags == ADSP_MMAP_HEAP_ADDR ||
				ud->flags == ADSP_MMAP_REMOTE_HEAP_ADDR)
			va_to_dsp = 0;
		else
			va_to_dsp = (uintptr_t)map->va;
		VERIFY(err, 0 == fastrpc_mmap_on_dsp(fl, ud->flags, va_to_dsp,
				map->phys, map->size, &raddr));
		if (err)
			goto bail;
		map->raddr = raddr;
	}
	ud->vaddrout = raddr;
 bail:
	if (err) {
		if (map) {
			mutex_lock(&fl->map_mutex);
			fastrpc_mmap_free(map, 0);
			mutex_unlock(&fl->map_mutex);
		}
		if (!IS_ERR_OR_NULL(rbuf))
			fastrpc_buf_free(rbuf, 0);
	}
	mutex_unlock(&fl->internal_map_mutex);
	return err;
}

static void fastrpc_context_list_dtor(struct fastrpc_file *fl);

static int fastrpc_session_alloc_locked(struct fastrpc_channel_ctx *chan,
			int secure, struct fastrpc_session_ctx **session)
{
	struct fastrpc_apps *me = &gfa;
	int idx = 0, err = 0;

	if (chan->sesscount) {
		for (idx = 0; idx < chan->sesscount; ++idx) {
			if (!chan->session[idx].used &&
				chan->session[idx].smmu.secure == secure) {
				chan->session[idx].used = 1;
				break;
			}
		}
		VERIFY(err, idx < chan->sesscount);
		if (err)
			goto bail;
		chan->session[idx].smmu.faults = 0;
	} else {
		VERIFY(err, me->dev != NULL);
		if (err)
			goto bail;
		chan->session[0].dev = me->dev;
		chan->session[0].smmu.dev = me->dev;
	}

	*session = &chan->session[idx];
 bail:
	return err;
}

static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
{
	int err = 0;
	int cid = -1;

	VERIFY(err, !IS_ERR_OR_NULL(rpdev));
	if (err)
		return -EINVAL;

	if (!strcmp(rpdev->dev.parent->of_node->name, "cdsp"))
		cid = CDSP_DOMAIN_ID;