Initial file dump from open source releaseHEADmaster

1 files changed, 916 insertions, 0 deletions

diff --git a/drivers/staging/tidspbridge/pmgr/cmm.c b/drivers/staging/tidspbridge/pmgr/cmm.c
new file mode 100644
index 00000000..4a800dad
--- /dev/null
+++ b/drivers/staging/tidspbridge/pmgr/cmm.c
@@ -0,0 +1,916 @@
+/*
+ * cmm.c
+ *
+ * DSP-BIOS Bridge driver support functions for TI OMAP processors.
+ *
+ * The Communication(Shared) Memory Management(CMM) module provides
+ * shared memory management services for DSP/BIOS Bridge data streaming
+ * and messaging.
+ *
+ * Multiple shared memory segments can be registered with CMM.
+ * Each registered SM segment is represented by a SM "allocator" that
+ * describes a block of physically contiguous shared memory used for
+ * future allocations by CMM.
+ *
+ * Memory is coalesced back to the appropriate heap when a buffer is
+ * freed.
+ *
+ * Notes:
+ *   Va: Virtual address.
+ *   Pa: Physical or kernel system address.
+ *
+ * Copyright (C) 2005-2006 Texas Instruments, Inc.
+ *
+ * This package is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+#include <linux/types.h>
+#include <linux/list.h>
+
+/*  ----------------------------------- DSP/BIOS Bridge */
+#include <dspbridge/dbdefs.h>
+
+/*  ----------------------------------- OS Adaptation Layer */
+#include <dspbridge/sync.h>
+
+/*  ----------------------------------- Platform Manager */
+#include <dspbridge/dev.h>
+#include <dspbridge/proc.h>
+
+/*  ----------------------------------- This */
+#include <dspbridge/cmm.h>
+
+/*  ----------------------------------- Defines, Data Structures, Typedefs */
+#define NEXT_PA(pnode)   (pnode->pa + pnode->size)
+
+/* Other bus/platform translations */
+#define DSPPA2GPPPA(base, x, y)  ((x)+(y))
+#define GPPPA2DSPPA(base, x, y)  ((x)-(y))
+
+/*
+ *  Allocators define a block of contiguous memory used for future allocations.
+ *
+ *      sma - shared memory allocator.
+ *      vma - virtual memory allocator.(not used).
+ */
+struct cmm_allocator {		/* sma */
+	unsigned int shm_base;	/* Start of physical SM block */
+	u32 sm_size;		/* Size of SM block in bytes */
+	unsigned int vm_base;	/* Start of VM block. (Dev driver
+					 * context for 'sma') */
+	u32 dsp_phys_addr_offset;	/* DSP PA to GPP PA offset for this
+					 * SM space */
+	s8 c_factor;		/* DSPPa to GPPPa Conversion Factor */
+	unsigned int dsp_base;	/* DSP virt base byte address */
+	u32 dsp_size;	/* DSP seg size in bytes */
+	struct cmm_object *cmm_mgr;	/* back ref to parent mgr */
+	/* node list of available memory */
+	struct list_head free_list;
+	/* node list of memory in use */
+	struct list_head in_use_list;
+};
+
+struct cmm_xlator {		/* Pa<->Va translator object */
+	/* CMM object this translator associated */
+	struct cmm_object *cmm_mgr;
+	/*
+	 *  Client process virtual base address that corresponds to phys SM
+	 *  base address for translator's seg_id.
+	 *  Only 1 segment ID currently supported.
+	 */
+	unsigned int virt_base;	/* virtual base address */
+	u32 virt_size;		/* size of virt space in bytes */
+	u32 seg_id;		/* Segment Id */
+};
+
+/* CMM Mgr */
+struct cmm_object {
+	/*
+	 * Cmm Lock is used to serialize access mem manager for multi-threads.
+	 */
+	struct mutex cmm_lock;	/* Lock to access cmm mgr */
+	struct list_head node_free_list;	/* Free list of memory nodes */
+	u32 min_block_size;	/* Min SM block; default 16 bytes */
+	u32 page_size;	/* Memory Page size (1k/4k) */
+	/* GPP SM segment ptrs */
+	struct cmm_allocator *pa_gppsm_seg_tab[CMM_MAXGPPSEGS];
+};
+
+/* Default CMM Mgr attributes */
+static struct cmm_mgrattrs cmm_dfltmgrattrs = {
+	/* min_block_size, min block size(bytes) allocated by cmm mgr */
+	16
+};
+
+/* Default allocation attributes */
+static struct cmm_attrs cmm_dfltalctattrs = {
+	1		/* seg_id, default segment Id for allocator */
+};
+
+/* Address translator default attrs */
+static struct cmm_xlatorattrs cmm_dfltxlatorattrs = {
+	/* seg_id, does not have to match cmm_dfltalctattrs ul_seg_id */
+	1,
+	0,			/* dsp_bufs */
+	0,			/* dsp_buf_size */
+	NULL,			/* vm_base */
+	0,			/* vm_size */
+};
+
+/* SM node representing a block of memory. */
+struct cmm_mnode {
+	struct list_head link;	/* must be 1st element */
+	u32 pa;		/* Phys addr */
+	u32 va;			/* Virtual address in device process context */
+	u32 size;		/* SM block size in bytes */
+	u32 client_proc;	/* Process that allocated this mem block */
+};
+
+/*  ----------------------------------- Function Prototypes */
+static void add_to_free_list(struct cmm_allocator *allocator,
+			     struct cmm_mnode *pnode);
+static struct cmm_allocator *get_allocator(struct cmm_object *cmm_mgr_obj,
+					   u32 ul_seg_id);
+static struct cmm_mnode *get_free_block(struct cmm_allocator *allocator,
+					u32 usize);
+static struct cmm_mnode *get_node(struct cmm_object *cmm_mgr_obj, u32 dw_pa,
+				  u32 dw_va, u32 ul_size);
+/* get available slot for new allocator */
+static s32 get_slot(struct cmm_object *cmm_mgr_obj);
+static void un_register_gppsm_seg(struct cmm_allocator *psma);
+
+/*
+ *  ======== cmm_calloc_buf ========
+ *  Purpose:
+ *      Allocate a SM buffer, zero contents, and return the physical address
+ *      and optional driver context virtual address(pp_buf_va).
+ *
+ *      The freelist is sorted in increasing size order. Get the first
+ *      block that satifies the request and sort the remaining back on
+ *      the freelist; if large enough. The kept block is placed on the
+ *      inUseList.
+ */
+void *cmm_calloc_buf(struct cmm_object *hcmm_mgr, u32 usize,
+		     struct cmm_attrs *pattrs, void **pp_buf_va)
+{
+	struct cmm_object *cmm_mgr_obj = (struct cmm_object *)hcmm_mgr;
+	void *buf_pa = NULL;
+	struct cmm_mnode *pnode = NULL;
+	struct cmm_mnode *new_node = NULL;
+	struct cmm_allocator *allocator = NULL;
+	u32 delta_size;
+	u8 *pbyte = NULL;
+	s32 cnt;
+
+	if (pattrs == NULL)
+		pattrs = &cmm_dfltalctattrs;
+
+	if (pp_buf_va != NULL)
+		*pp_buf_va = NULL;
+
+	if (cmm_mgr_obj && (usize != 0)) {
+		if (pattrs->seg_id > 0) {
+			/* SegId > 0 is SM */
+			/* get the allocator object for this segment id */
+			allocator =
+			    get_allocator(cmm_mgr_obj, pattrs->seg_id);
+			/* keep block size a multiple of min_block_size */
+			usize =
+			    ((usize - 1) & ~(cmm_mgr_obj->min_block_size -
+					     1))
+			    + cmm_mgr_obj->min_block_size;
+			mutex_lock(&cmm_mgr_obj->cmm_lock);
+			pnode = get_free_block(allocator, usize);
+		}
+		if (pnode) {
+			delta_size = (pnode->size - usize);
+			if (delta_size >= cmm_mgr_obj->min_block_size) {
+				/* create a new block with the leftovers and
+				 * add to freelist */
+				new_node =
+				    get_node(cmm_mgr_obj, pnode->pa + usize,
+					     pnode->va + usize,
+					     (u32) delta_size);
+				/* leftovers go free */
+				add_to_free_list(allocator, new_node);
+				/* adjust our node's size */
+				pnode->size = usize;
+			}
+			/* Tag node with client process requesting allocation
+			 * We'll need to free up a process's alloc'd SM if the
+			 * client process goes away.
+			 */
+			/* Return TGID instead of process handle */
+			pnode->client_proc = current->tgid;
+
+			/* put our node on InUse list */
+			list_add_tail(&pnode->link, &allocator->in_use_list);
+			buf_pa = (void *)pnode->pa;	/* physical address */
+			/* clear mem */
+			pbyte = (u8 *) pnode->va;
+			for (cnt = 0; cnt < (s32) usize; cnt++, pbyte++)
+				*pbyte = 0;
+
+			if (pp_buf_va != NULL) {
+				/* Virtual address */
+				*pp_buf_va = (void *)pnode->va;
+			}
+		}
+		mutex_unlock(&cmm_mgr_obj->cmm_lock);
+	}
+	return buf_pa;
+}
+
+/*
+ *  ======== cmm_create ========
+ *  Purpose:
+ *      Create a communication memory manager object.
+ */
+int cmm_create(struct cmm_object **ph_cmm_mgr,
+		      struct dev_object *hdev_obj,
+		      const struct cmm_mgrattrs *mgr_attrts)
+{
+	struct cmm_object *cmm_obj = NULL;
+	int status = 0;
+
+	*ph_cmm_mgr = NULL;
+	/* create, zero, and tag a cmm mgr object */
+	cmm_obj = kzalloc(sizeof(struct cmm_object), GFP_KERNEL);
+	if (!cmm_obj)
+		return -ENOMEM;
+
+	if (mgr_attrts == NULL)
+		mgr_attrts = &cmm_dfltmgrattrs;	/* set defaults */
+
+	/* save away smallest block allocation for this cmm mgr */
+	cmm_obj->min_block_size = mgr_attrts->min_block_size;
+	cmm_obj->page_size = PAGE_SIZE;
+
+	/* create node free list */
+	INIT_LIST_HEAD(&cmm_obj->node_free_list);
+	mutex_init(&cmm_obj->cmm_lock);
+	*ph_cmm_mgr = cmm_obj;
+
+	return status;
+}
+
+/*
+ *  ======== cmm_destroy ========
+ *  Purpose:
+ *      Release the communication memory manager resources.
+ */
+int cmm_destroy(struct cmm_object *hcmm_mgr, bool force)
+{
+	struct cmm_object *cmm_mgr_obj = (struct cmm_object *)hcmm_mgr;
+	struct cmm_info temp_info;
+	int status = 0;
+	s32 slot_seg;
+	struct cmm_mnode *node, *tmp;
+
+	if (!hcmm_mgr) {
+		status = -EFAULT;
+		return status;
+	}
+	mutex_lock(&cmm_mgr_obj->cmm_lock);
+	/* If not force then fail if outstanding allocations exist */
+	if (!force) {
+		/* Check for outstanding memory allocations */
+		status = cmm_get_info(hcmm_mgr, &temp_info);
+		if (!status) {
+			if (temp_info.total_in_use_cnt > 0) {
+				/* outstanding allocations */
+				status = -EPERM;
+			}
+		}
+	}
+	if (!status) {
+		/* UnRegister SM allocator */
+		for (slot_seg = 0; slot_seg < CMM_MAXGPPSEGS; slot_seg++) {
+			if (cmm_mgr_obj->pa_gppsm_seg_tab[slot_seg] != NULL) {
+				un_register_gppsm_seg
+				    (cmm_mgr_obj->pa_gppsm_seg_tab[slot_seg]);
+				/* Set slot to NULL for future reuse */
+				cmm_mgr_obj->pa_gppsm_seg_tab[slot_seg] = NULL;
+			}
+		}
+	}
+	list_for_each_entry_safe(node, tmp, &cmm_mgr_obj->node_free_list,
+			link) {
+		list_del(&node->link);
+		kfree(node);
+	}
+	mutex_unlock(&cmm_mgr_obj->cmm_lock);
+	if (!status) {
+		/* delete CS & cmm mgr object */
+		mutex_destroy(&cmm_mgr_obj->cmm_lock);
+		kfree(cmm_mgr_obj);
+	}
+	return status;
+}
+
+/*
+ *  ======== cmm_free_buf ========
+ *  Purpose:
+ *      Free the given buffer.
+ */
+int cmm_free_buf(struct cmm_object *hcmm_mgr, void *buf_pa, u32 ul_seg_id)
+{
+	struct cmm_object *cmm_mgr_obj = (struct cmm_object *)hcmm_mgr;
+	int status = -EFAULT;
+	struct cmm_mnode *curr, *tmp;
+	struct cmm_allocator *allocator;
+	struct cmm_attrs *pattrs;
+
+	if (ul_seg_id == 0) {
+		pattrs = &cmm_dfltalctattrs;
+		ul_seg_id = pattrs->seg_id;
+	}
+	if (!hcmm_mgr || !(ul_seg_id > 0)) {
+		status = -EFAULT;
+		return status;
+	}
+
+	allocator = get_allocator(cmm_mgr_obj, ul_seg_id);
+	if (!allocator)
+		return status;
+
+	mutex_lock(&cmm_mgr_obj->cmm_lock);
+	list_for_each_entry_safe(curr, tmp, &allocator->in_use_list, link) {
+		if (curr->pa == (u32) buf_pa) {
+			list_del(&curr->link);
+			add_to_free_list(allocator, curr);
+			status = 0;
+			break;
+		}
+	}
+	mutex_unlock(&cmm_mgr_obj->cmm_lock);
+
+	return status;
+}
+
+/*
+ *  ======== cmm_get_handle ========
+ *  Purpose:
+ *      Return the communication memory manager object for this device.
+ *      This is typically called from the client process.
+ */
+int cmm_get_handle(void *hprocessor, struct cmm_object ** ph_cmm_mgr)
+{
+	int status = 0;
+	struct dev_object *hdev_obj;
+
+	if (hprocessor != NULL)
+		status = proc_get_dev_object(hprocessor, &hdev_obj);
+	else
+		hdev_obj = dev_get_first();	/* default */
+
+	if (!status)
+		status = dev_get_cmm_mgr(hdev_obj, ph_cmm_mgr);
+
+	return status;
+}
+
+/*
+ *  ======== cmm_get_info ========
+ *  Purpose:
+ *      Return the current memory utilization information.
+ */
+int cmm_get_info(struct cmm_object *hcmm_mgr,
+			struct cmm_info *cmm_info_obj)
+{
+	struct cmm_object *cmm_mgr_obj = (struct cmm_object *)hcmm_mgr;
+	u32 ul_seg;
+	int status = 0;
+	struct cmm_allocator *altr;
+	struct cmm_mnode *curr;
+
+	if (!hcmm_mgr) {
+		status = -EFAULT;
+		return status;
+	}
+	mutex_lock(&cmm_mgr_obj->cmm_lock);
+	cmm_info_obj->num_gppsm_segs = 0;	/* # of SM segments */
+	/* Total # of outstanding alloc */
+	cmm_info_obj->total_in_use_cnt = 0;
+	/* min block size */
+	cmm_info_obj->min_block_size = cmm_mgr_obj->min_block_size;
+	/* check SM memory segments */
+	for (ul_seg = 1; ul_seg <= CMM_MAXGPPSEGS; ul_seg++) {
+		/* get the allocator object for this segment id */
+		altr = get_allocator(cmm_mgr_obj, ul_seg);
+		if (!altr)
+			continue;
+		cmm_info_obj->num_gppsm_segs++;
+		cmm_info_obj->seg_info[ul_seg - 1].seg_base_pa =
+			altr->shm_base - altr->dsp_size;
+		cmm_info_obj->seg_info[ul_seg - 1].total_seg_size =
+			altr->dsp_size + altr->sm_size;
+		cmm_info_obj->seg_info[ul_seg - 1].gpp_base_pa =
+			altr->shm_base;
+		cmm_info_obj->seg_info[ul_seg - 1].gpp_size =
+			altr->sm_size;
+		cmm_info_obj->seg_info[ul_seg - 1].dsp_base_va =
+			altr->dsp_base;
+		cmm_info_obj->seg_info[ul_seg - 1].dsp_size =
+			altr->dsp_size;
+		cmm_info_obj->seg_info[ul_seg - 1].seg_base_va =
+			altr->vm_base - altr->dsp_size;
+		cmm_info_obj->seg_info[ul_seg - 1].in_use_cnt = 0;
+
+		list_for_each_entry(curr, &altr->in_use_list, link) {
+			cmm_info_obj->total_in_use_cnt++;
+			cmm_info_obj->seg_info[ul_seg - 1].in_use_cnt++;
+		}
+	}
+	mutex_unlock(&cmm_mgr_obj->cmm_lock);
+	return status;
+}
+
+/*
+ *  ======== cmm_register_gppsm_seg ========
+ *  Purpose:
+ *      Register a block of SM with the CMM to be used for later GPP SM
+ *      allocations.
+ */
+int cmm_register_gppsm_seg(struct cmm_object *hcmm_mgr,
+				  u32 dw_gpp_base_pa, u32 ul_size,
+				  u32 dsp_addr_offset, s8 c_factor,
+				  u32 dw_dsp_base, u32 ul_dsp_size,
+				  u32 *sgmt_id, u32 gpp_base_va)
+{
+	struct cmm_object *cmm_mgr_obj = (struct cmm_object *)hcmm_mgr;
+	struct cmm_allocator *psma = NULL;
+	int status = 0;
+	struct cmm_mnode *new_node;
+	s32 slot_seg;
+
+	dev_dbg(bridge, "%s: dw_gpp_base_pa %x ul_size %x dsp_addr_offset %x "
+			"dw_dsp_base %x ul_dsp_size %x gpp_base_va %x\n",
+			__func__, dw_gpp_base_pa, ul_size, dsp_addr_offset,
+			dw_dsp_base, ul_dsp_size, gpp_base_va);
+
+	if (!hcmm_mgr)
+		return -EFAULT;
+
+	/* make sure we have room for another allocator */
+	mutex_lock(&cmm_mgr_obj->cmm_lock);
+
+	slot_seg = get_slot(cmm_mgr_obj);
+	if (slot_seg < 0) {
+		status = -EPERM;
+		goto func_end;
+	}
+
+	/* Check if input ul_size is big enough to alloc at least one block */
+	if (ul_size < cmm_mgr_obj->min_block_size) {
+		status = -EINVAL;
+		goto func_end;
+	}
+
+	/* create, zero, and tag an SM allocator object */
+	psma = kzalloc(sizeof(struct cmm_allocator), GFP_KERNEL);
+	if (!psma) {
+		status = -ENOMEM;
+		goto func_end;
+	}
+
+	psma->cmm_mgr = hcmm_mgr;	/* ref to parent */
+	psma->shm_base = dw_gpp_base_pa;	/* SM Base phys */
+	psma->sm_size = ul_size;	/* SM segment size in bytes */
+	psma->vm_base = gpp_base_va;
+	psma->dsp_phys_addr_offset = dsp_addr_offset;
+	psma->c_factor = c_factor;
+	psma->dsp_base = dw_dsp_base;
+	psma->dsp_size = ul_dsp_size;
+	if (psma->vm_base == 0) {
+		status = -EPERM;
+		goto func_end;
+	}
+	/* return the actual segment identifier */
+	*sgmt_id = (u32) slot_seg + 1;
+
+	INIT_LIST_HEAD(&psma->free_list);
+	INIT_LIST_HEAD(&psma->in_use_list);
+
+	/* Get a mem node for this hunk-o-memory */
+	new_node = get_node(cmm_mgr_obj, dw_gpp_base_pa,
+			psma->vm_base, ul_size);
+	/* Place node on the SM allocator's free list */
+	if (new_node) {
+		list_add_tail(&new_node->link, &psma->free_list);
+	} else {
+		status = -ENOMEM;
+		goto func_end;
+	}
+	/* make entry */
+	cmm_mgr_obj->pa_gppsm_seg_tab[slot_seg] = psma;
+
+func_end:
+	/* Cleanup allocator */
+	if (status && psma)
+		un_register_gppsm_seg(psma);
+	mutex_unlock(&cmm_mgr_obj->cmm_lock);
+
+	return status;
+}
+
+/*
+ *  ======== cmm_un_register_gppsm_seg ========
+ *  Purpose:
+ *      UnRegister GPP SM segments with the CMM.
+ */
+int cmm_un_register_gppsm_seg(struct cmm_object *hcmm_mgr,
+				     u32 ul_seg_id)
+{
+	struct cmm_object *cmm_mgr_obj = (struct cmm_object *)hcmm_mgr;
+	int status = 0;
+	struct cmm_allocator *psma;
+	u32 ul_id = ul_seg_id;
+
+	if (!hcmm_mgr)
+		return -EFAULT;
+
+	if (ul_seg_id == CMM_ALLSEGMENTS)
+		ul_id = 1;
+
+	if ((ul_id <= 0) || (ul_id > CMM_MAXGPPSEGS))
+		return -EINVAL;
+
+	/*
+	 * FIXME: CMM_MAXGPPSEGS == 1. why use a while cycle? Seems to me like
+	 * the ul_seg_id is not needed here. It must be always 1.
+	 */
+	while (ul_id <= CMM_MAXGPPSEGS) {
+		mutex_lock(&cmm_mgr_obj->cmm_lock);
+		/* slot = seg_id-1 */
+		psma = cmm_mgr_obj->pa_gppsm_seg_tab[ul_id - 1];
+		if (psma != NULL) {
+			un_register_gppsm_seg(psma);
+			/* Set alctr ptr to NULL for future reuse */
+			cmm_mgr_obj->pa_gppsm_seg_tab[ul_id - 1] = NULL;
+		} else if (ul_seg_id != CMM_ALLSEGMENTS) {
+			status = -EPERM;
+		}
+		mutex_unlock(&cmm_mgr_obj->cmm_lock);
+		if (ul_seg_id != CMM_ALLSEGMENTS)
+			break;
+
+		ul_id++;
+	}	/* end while */
+	return status;
+}
+
+/*
+ *  ======== un_register_gppsm_seg ========
+ *  Purpose:
+ *      UnRegister the SM allocator by freeing all its resources and
+ *      nulling cmm mgr table entry.
+ *  Note:
+ *      This routine is always called within cmm lock crit sect.
+ */
+static void un_register_gppsm_seg(struct cmm_allocator *psma)
+{
+	struct cmm_mnode *curr, *tmp;
+
+	/* free nodes on free list */
+	list_for_each_entry_safe(curr, tmp, &psma->free_list, link) {
+		list_del(&curr->link);
+		kfree(curr);
+	}
+
+	/* free nodes on InUse list */
+	list_for_each_entry_safe(curr, tmp, &psma->in_use_list, link) {
+		list_del(&curr->link);
+		kfree(curr);
+	}
+
+	if ((void *)psma->vm_base != NULL)
+		MEM_UNMAP_LINEAR_ADDRESS((void *)psma->vm_base);
+
+	/* Free allocator itself */
+	kfree(psma);
+}
+
+/*
+ *  ======== get_slot ========
+ *  Purpose:
+ *      An available slot # is returned. Returns negative on failure.
+ */
+static s32 get_slot(struct cmm_object *cmm_mgr_obj)
+{
+	s32 slot_seg = -1;	/* neg on failure */
+	/* get first available slot in cmm mgr SMSegTab[] */
+	for (slot_seg = 0; slot_seg < CMM_MAXGPPSEGS; slot_seg++) {
+		if (cmm_mgr_obj->pa_gppsm_seg_tab[slot_seg] == NULL)
+			break;
+
+	}
+	if (slot_seg == CMM_MAXGPPSEGS)
+		slot_seg = -1;	/* failed */
+
+	return slot_seg;
+}
+
+/*
+ *  ======== get_node ========
+ *  Purpose:
+ *      Get a memory node from freelist or create a new one.
+ */
+static struct cmm_mnode *get_node(struct cmm_object *cmm_mgr_obj, u32 dw_pa,
+				  u32 dw_va, u32 ul_size)
+{
+	struct cmm_mnode *pnode;
+
+	/* Check cmm mgr's node freelist */
+	if (list_empty(&cmm_mgr_obj->node_free_list)) {
+		pnode = kzalloc(sizeof(struct cmm_mnode), GFP_KERNEL);
+		if (!pnode)
+			return NULL;
+	} else {
+		/* surely a valid element */
+		pnode = list_first_entry(&cmm_mgr_obj->node_free_list,
+				struct cmm_mnode, link);
+		list_del_init(&pnode->link);
+	}
+
+	pnode->pa = dw_pa;
+	pnode->va = dw_va;
+	pnode->size = ul_size;
+
+	return pnode;
+}
+
+/*
+ *  ======== delete_node ========
+ *  Purpose:
+ *      Put a memory node on the cmm nodelist for later use.
+ *      Doesn't actually delete the node. Heap thrashing friendly.
+ */
+static void delete_node(struct cmm_object *cmm_mgr_obj, struct cmm_mnode *pnode)
+{
+	list_add_tail(&pnode->link, &cmm_mgr_obj->node_free_list);
+}
+
+/*
+ * ====== get_free_block ========
+ *  Purpose:
+ *      Scan the free block list and return the first block that satisfies
+ *      the size.
+ */
+static struct cmm_mnode *get_free_block(struct cmm_allocator *allocator,
+					u32 usize)
+{
+	struct cmm_mnode *node, *tmp;
+
+	if (!allocator)
+		return NULL;
+
+	list_for_each_entry_safe(node, tmp, &allocator->free_list, link) {
+		if (usize <= node->size) {
+			list_del(&node->link);
+			return node;
+		}
+	}
+
+	return NULL;
+}
+
+/*
+ *  ======== add_to_free_list ========
+ *  Purpose:
+ *      Coalesce node into the freelist in ascending size order.
+ */
+static void add_to_free_list(struct cmm_allocator *allocator,
+			     struct cmm_mnode *node)
+{
+	struct cmm_mnode *curr;
+
+	if (!node) {
+		pr_err("%s: failed - node is NULL\n", __func__);
+		return;
+	}
+
+	list_for_each_entry(curr, &allocator->free_list, link) {
+		if (NEXT_PA(curr) == node->pa) {
+			curr->size += node->size;
+			delete_node(allocator->cmm_mgr, node);
+			return;
+		}
+		if (curr->pa == NEXT_PA(node)) {
+			curr->pa = node->pa;
+			curr->va = node->va;
+			curr->size += node->size;
+			delete_node(allocator->cmm_mgr, node);
+			return;
+		}
+	}
+	list_for_each_entry(curr, &allocator->free_list, link) {
+		if (curr->size >= node->size) {
+			list_add_tail(&node->link, &curr->link);
+			return;
+		}
+	}
+	list_add_tail(&node->link, &allocator->free_list);
+}
+
+/*
+ * ======== get_allocator ========
+ *  Purpose:
+ *      Return the allocator for the given SM Segid.
+ *      SegIds:  1,2,3..max.
+ */
+static struct cmm_allocator *get_allocator(struct cmm_object *cmm_mgr_obj,
+					   u32 ul_seg_id)
+{
+	return cmm_mgr_obj->pa_gppsm_seg_tab[ul_seg_id - 1];
+}
+
+/*
+ *  The CMM_Xlator[xxx] routines below are used by Node and Stream
+ *  to perform SM address translation to the client process address space.
+ *  A "translator" object is created by a node/stream for each SM seg used.
+ */
+
+/*
+ *  ======== cmm_xlator_create ========
+ *  Purpose:
+ *      Create an address translator object.
+ */
+int cmm_xlator_create(struct cmm_xlatorobject **xlator,
+			     struct cmm_object *hcmm_mgr,
+			     struct cmm_xlatorattrs *xlator_attrs)
+{
+	struct cmm_xlator *xlator_object = NULL;
+	int status = 0;
+
+	*xlator = NULL;
+	if (xlator_attrs == NULL)
+		xlator_attrs = &cmm_dfltxlatorattrs;	/* set defaults */
+
+	xlator_object = kzalloc(sizeof(struct cmm_xlator), GFP_KERNEL);
+	if (xlator_object != NULL) {
+		xlator_object->cmm_mgr = hcmm_mgr;	/* ref back to CMM */
+		/* SM seg_id */
+		xlator_object->seg_id = xlator_attrs->seg_id;
+	} else {
+		status = -ENOMEM;
+	}
+	if (!status)
+		*xlator = (struct cmm_xlatorobject *)xlator_object;
+
+	return status;
+}
+
+/*
+ *  ======== cmm_xlator_alloc_buf ========
+ */
+void *cmm_xlator_alloc_buf(struct cmm_xlatorobject *xlator, void *va_buf,
+			   u32 pa_size)
+{
+	struct cmm_xlator *xlator_obj = (struct cmm_xlator *)xlator;
+	void *pbuf = NULL;
+	void *tmp_va_buff;
+	struct cmm_attrs attrs;
+
+	if (xlator_obj) {
+		attrs.seg_id = xlator_obj->seg_id;
+		__raw_writel(0, va_buf);
+		/* Alloc SM */
+		pbuf =
+		    cmm_calloc_buf(xlator_obj->cmm_mgr, pa_size, &attrs, NULL);
+		if (pbuf) {
+			/* convert to translator(node/strm) process Virtual
+			 * address */
+			 tmp_va_buff = cmm_xlator_translate(xlator,
+							 pbuf, CMM_PA2VA);
+			__raw_writel((u32)tmp_va_buff, va_buf);
+		}
+	}
+	return pbuf;
+}
+
+/*
+ *  ======== cmm_xlator_free_buf ========
+ *  Purpose:
+ *      Free the given SM buffer and descriptor.
+ *      Does not free virtual memory.
+ */
+int cmm_xlator_free_buf(struct cmm_xlatorobject *xlator, void *buf_va)
+{
+	struct cmm_xlator *xlator_obj = (struct cmm_xlator *)xlator;
+	int status = -EPERM;
+	void *buf_pa = NULL;
+
+	if (xlator_obj) {
+		/* convert Va to Pa so we can free it. */
+		buf_pa = cmm_xlator_translate(xlator, buf_va, CMM_VA2PA);
+		if (buf_pa) {
+			status = cmm_free_buf(xlator_obj->cmm_mgr, buf_pa,
+					      xlator_obj->seg_id);
+			if (status) {
+				/* Uh oh, this shouldn't happen. Descriptor
+				 * gone! */
+				pr_err("%s, line %d: Assertion failed\n",
+				       __FILE__, __LINE__);
+			}
+		}
+	}
+	return status;
+}
+
+/*
+ *  ======== cmm_xlator_info ========
+ *  Purpose:
+ *      Set/Get translator info.
+ */
+int cmm_xlator_info(struct cmm_xlatorobject *xlator, u8 ** paddr,
+			   u32 ul_size, u32 segm_id, bool set_info)
+{
+	struct cmm_xlator *xlator_obj = (struct cmm_xlator *)xlator;
+	int status = 0;
+
+	if (xlator_obj) {
+		if (set_info) {
+			/* set translators virtual address range */
+			xlator_obj->virt_base = (u32) *paddr;
+			xlator_obj->virt_size = ul_size;
+		} else {	/* return virt base address */
+			*paddr = (u8 *) xlator_obj->virt_base;
+		}
+	} else {
+		status = -EFAULT;
+	}
+	return status;
+}
+
+/*
+ *  ======== cmm_xlator_translate ========
+ */
+void *cmm_xlator_translate(struct cmm_xlatorobject *xlator, void *paddr,
+			   enum cmm_xlatetype xtype)
+{
+	u32 dw_addr_xlate = 0;
+	struct cmm_xlator *xlator_obj = (struct cmm_xlator *)xlator;
+	struct cmm_object *cmm_mgr_obj = NULL;
+	struct cmm_allocator *allocator = NULL;
+	u32 dw_offset = 0;
+
+	if (!xlator_obj)
+		goto loop_cont;
+
+	cmm_mgr_obj = (struct cmm_object *)xlator_obj->cmm_mgr;
+	/* get this translator's default SM allocator */
+	allocator = cmm_mgr_obj->pa_gppsm_seg_tab[xlator_obj->seg_id - 1];
+	if (!allocator)
+		goto loop_cont;
+
+	if ((xtype == CMM_VA2DSPPA) || (xtype == CMM_VA2PA) ||
+	    (xtype == CMM_PA2VA)) {
+		if (xtype == CMM_PA2VA) {
+			/* Gpp Va = Va Base + offset */
+			dw_offset = (u8 *) paddr - (u8 *) (allocator->shm_base -
+							   allocator->
+							   dsp_size);
+			dw_addr_xlate = xlator_obj->virt_base + dw_offset;
+			/* Check if translated Va base is in range */
+			if ((dw_addr_xlate < xlator_obj->virt_base) ||
+			    (dw_addr_xlate >=
+			     (xlator_obj->virt_base +
+			      xlator_obj->virt_size))) {
+				dw_addr_xlate = 0;	/* bad address */
+			}
+		} else {
+			/* Gpp PA =  Gpp Base + offset */
+			dw_offset =
+			    (u8 *) paddr - (u8 *) xlator_obj->virt_base;
+			dw_addr_xlate =
+			    allocator->shm_base - allocator->dsp_size +
+			    dw_offset;
+		}
+	} else {
+		dw_addr_xlate = (u32) paddr;
+	}
+	/*Now convert address to proper target physical address if needed */
+	if ((xtype == CMM_VA2DSPPA) || (xtype == CMM_PA2DSPPA)) {
+		/* Got Gpp Pa now, convert to DSP Pa */
+		dw_addr_xlate =
+		    GPPPA2DSPPA((allocator->shm_base - allocator->dsp_size),
+				dw_addr_xlate,
+				allocator->dsp_phys_addr_offset *
+				allocator->c_factor);
+	} else if (xtype == CMM_DSPPA2PA) {
+		/* Got DSP Pa, convert to GPP Pa */
+		dw_addr_xlate =
+		    DSPPA2GPPPA(allocator->shm_base - allocator->dsp_size,
+				dw_addr_xlate,
+				allocator->dsp_phys_addr_offset *
+				allocator->c_factor);
+	}
+loop_cont:
+	return (void *)dw_addr_xlate;
+}