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-rw-r--r--target/linux/brcm2708/patches-4.19/950-0251-staging-vc04_services-Add-new-vc-sm-cma-driver.patch1881
1 files changed, 1881 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0251-staging-vc04_services-Add-new-vc-sm-cma-driver.patch b/target/linux/brcm2708/patches-4.19/950-0251-staging-vc04_services-Add-new-vc-sm-cma-driver.patch
new file mode 100644
index 0000000000..9e9af47a37
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0251-staging-vc04_services-Add-new-vc-sm-cma-driver.patch
@@ -0,0 +1,1881 @@
+From 2994fdc0a9d48be68d6e403bc8ddadecfc8d8796 Mon Sep 17 00:00:00 2001
+From: Dave Stevenson <dave.stevenson@raspberrypi.org>
+Date: Tue, 25 Sep 2018 10:27:11 +0100
+Subject: [PATCH] staging: vc04_services: Add new vc-sm-cma driver
+
+This new driver allows contiguous memory blocks to be imported
+into the VideoCore VPU memory map, and manages the lifetime of
+those objects, only releasing the source dmabuf once the VPU has
+confirmed it has finished with it.
+
+Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
+---
+ drivers/staging/vc04_services/Kconfig | 1 +
+ drivers/staging/vc04_services/Makefile | 1 +
+ .../staging/vc04_services/vc-sm-cma/Kconfig | 10 +
+ .../staging/vc04_services/vc-sm-cma/Makefile | 8 +
+ drivers/staging/vc04_services/vc-sm-cma/TODO | 2 +
+ .../staging/vc04_services/vc-sm-cma/vc_sm.c | 838 ++++++++++++++++++
+ .../staging/vc04_services/vc-sm-cma/vc_sm.h | 59 ++
+ .../vc04_services/vc-sm-cma/vc_sm_cma_vchi.c | 498 +++++++++++
+ .../vc04_services/vc-sm-cma/vc_sm_cma_vchi.h | 59 ++
+ .../vc04_services/vc-sm-cma/vc_sm_defs.h | 298 +++++++
+ .../vc04_services/vc-sm-cma/vc_sm_knl.h | 28 +
+ 11 files changed, 1802 insertions(+)
+ create mode 100644 drivers/staging/vc04_services/vc-sm-cma/Kconfig
+ create mode 100644 drivers/staging/vc04_services/vc-sm-cma/Makefile
+ create mode 100644 drivers/staging/vc04_services/vc-sm-cma/TODO
+ create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm.c
+ create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm.h
+ create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm_cma_vchi.c
+ create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm_cma_vchi.h
+ create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm_defs.h
+ create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm_knl.h
+
+--- a/drivers/staging/vc04_services/Kconfig
++++ b/drivers/staging/vc04_services/Kconfig
+@@ -22,6 +22,7 @@ source "drivers/staging/vc04_services/bc
+
+ source "drivers/staging/vc04_services/bcm2835-camera/Kconfig"
+ source "drivers/staging/vc04_services/vchiq-mmal/Kconfig"
++source "drivers/staging/vc04_services/vc-sm-cma/Kconfig"
+
+ endif
+
+--- a/drivers/staging/vc04_services/Makefile
++++ b/drivers/staging/vc04_services/Makefile
+@@ -13,6 +13,7 @@ vchiq-objs := \
+ obj-$(CONFIG_SND_BCM2835) += bcm2835-audio/
+ obj-$(CONFIG_VIDEO_BCM2835) += bcm2835-camera/
+ obj-$(CONFIG_BCM2835_VCHIQ_MMAL) += vchiq-mmal/
++obj-$(CONFIG_BCM_VC_SM_CMA) += vc-sm-cma/
+
+ ccflags-y += -Idrivers/staging/vc04_services -D__VCCOREVER__=0x04000000
+
+--- /dev/null
++++ b/drivers/staging/vc04_services/vc-sm-cma/Kconfig
+@@ -0,0 +1,10 @@
++config BCM_VC_SM_CMA
++ tristate "VideoCore Shared Memory (CMA) driver"
++ depends on BCM2835_VCHIQ
++ select RBTREE
++ select DMA_SHARED_BUFFER
++ help
++ Say Y here to enable the shared memory interface that
++ supports sharing dmabufs with VideoCore.
++ This operates over the VCHIQ interface to a service
++ running on VideoCore.
+--- /dev/null
++++ b/drivers/staging/vc04_services/vc-sm-cma/Makefile
+@@ -0,0 +1,8 @@
++ccflags-y += -Idrivers/staging/vc04_services -Idrivers/staging/vc04_services/interface/vchi -Idrivers/staging/vc04_services/interface/vchiq_arm
++# -I"drivers/staging/android/ion/" -I"$(srctree)/fs/"
++ccflags-y += -D__VCCOREVER__=0
++
++vc-sm-cma-$(CONFIG_BCM_VC_SM_CMA) := \
++ vc_sm.o vc_sm_cma_vchi.o
++
++obj-$(CONFIG_BCM_VC_SM_CMA) += vc-sm-cma.o
+--- /dev/null
++++ b/drivers/staging/vc04_services/vc-sm-cma/TODO
+@@ -0,0 +1,2 @@
++1) Convert to a platform driver.
++
+--- /dev/null
++++ b/drivers/staging/vc04_services/vc-sm-cma/vc_sm.c
+@@ -0,0 +1,838 @@
++// SPDX-License-Identifier: GPL-2.0
++/*
++ * VideoCore Shared Memory driver using CMA.
++ *
++ * Copyright: 2018, Raspberry Pi (Trading) Ltd
++ * Dave Stevenson <dave.stevenson@raspberrypi.org>
++ *
++ * Based on vmcs_sm driver from Broadcom Corporation for some API,
++ * and taking some code for CMA/dmabuf handling from the Android Ion
++ * driver (Google/Linaro).
++ *
++ * This is cut down version to only support import of dma_bufs from
++ * other kernel drivers. A more complete implementation of the old
++ * vmcs_sm functionality can follow later.
++ *
++ */
++
++/* ---- Include Files ----------------------------------------------------- */
++#include <linux/cdev.h>
++#include <linux/device.h>
++#include <linux/debugfs.h>
++#include <linux/dma-mapping.h>
++#include <linux/dma-buf.h>
++#include <linux/errno.h>
++#include <linux/fs.h>
++#include <linux/kernel.h>
++#include <linux/list.h>
++#include <linux/miscdevice.h>
++#include <linux/module.h>
++#include <linux/mm.h>
++#include <linux/of_device.h>
++#include <linux/platform_device.h>
++#include <linux/proc_fs.h>
++#include <linux/slab.h>
++#include <linux/seq_file.h>
++#include <linux/syscalls.h>
++#include <linux/types.h>
++
++#include "vchiq_connected.h"
++#include "vc_sm_cma_vchi.h"
++
++#include "vc_sm.h"
++#include "vc_sm_knl.h"
++
++/* ---- Private Constants and Types --------------------------------------- */
++
++#define DEVICE_NAME "vcsm-cma"
++#define DEVICE_MINOR 0
++
++#define VC_SM_RESOURCE_NAME_DEFAULT "sm-host-resource"
++
++#define VC_SM_DIR_ROOT_NAME "vcsm-cma"
++#define VC_SM_STATE "state"
++
++/* Private file data associated with each opened device. */
++struct vc_sm_privdata_t {
++ pid_t pid; /* PID of creator. */
++
++ int restart_sys; /* Tracks restart on interrupt. */
++ enum vc_sm_msg_type int_action; /* Interrupted action. */
++ u32 int_trans_id; /* Interrupted transaction. */
++};
++
++typedef int (*VC_SM_SHOW) (struct seq_file *s, void *v);
++struct sm_pde_t {
++ VC_SM_SHOW show; /* Debug fs function hookup. */
++ struct dentry *dir_entry; /* Debug fs directory entry. */
++ void *priv_data; /* Private data */
++};
++
++/* Global state information. */
++struct sm_state_t {
++ struct platform_device *pdev;
++
++ struct miscdevice dev;
++ struct sm_instance *sm_handle; /* Handle for videocore service. */
++
++ struct mutex map_lock; /* Global map lock. */
++ struct list_head buffer_list; /* List of buffer. */
++
++ struct vc_sm_privdata_t *data_knl; /* Kernel internal data tracking. */
++ struct dentry *dir_root; /* Debug fs entries root. */
++ struct sm_pde_t dir_state; /* Debug fs entries state sub-tree. */
++
++ bool require_released_callback; /* VPU will send a released msg when it
++ * has finished with a resource.
++ */
++ u32 int_trans_id; /* Interrupted transaction. */
++};
++
++/* ---- Private Variables ----------------------------------------------- */
++
++static struct sm_state_t *sm_state;
++static int sm_inited;
++
++/* ---- Private Function Prototypes -------------------------------------- */
++
++/* ---- Private Functions ------------------------------------------------ */
++
++static int vc_sm_cma_seq_file_show(struct seq_file *s, void *v)
++{
++ struct sm_pde_t *sm_pde;
++
++ sm_pde = (struct sm_pde_t *)(s->private);
++
++ if (sm_pde && sm_pde->show)
++ sm_pde->show(s, v);
++
++ return 0;
++}
++
++static int vc_sm_cma_single_open(struct inode *inode, struct file *file)
++{
++ return single_open(file, vc_sm_cma_seq_file_show, inode->i_private);
++}
++
++static const struct file_operations vc_sm_cma_debug_fs_fops = {
++ .open = vc_sm_cma_single_open,
++ .read = seq_read,
++ .llseek = seq_lseek,
++ .release = single_release,
++};
++
++static int vc_sm_cma_global_state_show(struct seq_file *s, void *v)
++{
++ struct vc_sm_buffer *resource = NULL;
++ int resource_count = 0;
++
++ if (!sm_state)
++ return 0;
++
++ seq_printf(s, "\nVC-ServiceHandle 0x%x\n",
++ (unsigned int)sm_state->sm_handle);
++
++ /* Log all applicable mapping(s). */
++
++ mutex_lock(&sm_state->map_lock);
++ seq_puts(s, "\nResources\n");
++ if (!list_empty(&sm_state->buffer_list)) {
++ list_for_each_entry(resource, &sm_state->buffer_list,
++ global_buffer_list) {
++ resource_count++;
++
++ seq_printf(s, "\nResource %p\n",
++ resource);
++ seq_printf(s, " NAME %s\n",
++ resource->name);
++ seq_printf(s, " SIZE %d\n",
++ resource->size);
++ seq_printf(s, " DMABUF %p\n",
++ resource->dma_buf);
++ seq_printf(s, " ATTACH %p\n",
++ resource->attach);
++ seq_printf(s, " SG_TABLE %p\n",
++ resource->sg_table);
++ seq_printf(s, " SGT %p\n",
++ resource->sgt);
++ seq_printf(s, " DMA_ADDR %pad\n",
++ &resource->dma_addr);
++ seq_printf(s, " VC_HANDLE %08x\n",
++ resource->vc_handle);
++ seq_printf(s, " VC_MAPPING %d\n",
++ resource->vpu_state);
++ }
++ }
++ seq_printf(s, "\n\nTotal resource count: %d\n\n", resource_count);
++
++ mutex_unlock(&sm_state->map_lock);
++
++ return 0;
++}
++
++/*
++ * Adds a buffer to the private data list which tracks all the allocated
++ * data.
++ */
++static void vc_sm_add_resource(struct vc_sm_privdata_t *privdata,
++ struct vc_sm_buffer *buffer)
++{
++ mutex_lock(&sm_state->map_lock);
++ list_add(&buffer->global_buffer_list, &sm_state->buffer_list);
++ mutex_unlock(&sm_state->map_lock);
++
++ pr_debug("[%s]: added buffer %p (name %s, size %d)\n",
++ __func__, buffer, buffer->name, buffer->size);
++}
++
++/*
++ * Release an allocation.
++ * All refcounting is done via the dma buf object.
++ */
++static void vc_sm_release_resource(struct vc_sm_buffer *buffer, int force)
++{
++ mutex_lock(&sm_state->map_lock);
++ mutex_lock(&buffer->lock);
++
++ pr_debug("[%s]: buffer %p (name %s, size %d)\n",
++ __func__, buffer, buffer->name, buffer->size);
++
++ if (buffer->vc_handle && buffer->vpu_state == VPU_MAPPED) {
++ struct vc_sm_free_t free = { buffer->vc_handle, 0 };
++ int status = vc_sm_cma_vchi_free(sm_state->sm_handle, &free,
++ &sm_state->int_trans_id);
++ if (status != 0 && status != -EINTR) {
++ pr_err("[%s]: failed to free memory on videocore (status: %u, trans_id: %u)\n",
++ __func__, status, sm_state->int_trans_id);
++ }
++
++ if (sm_state->require_released_callback) {
++ /* Need to wait for the VPU to confirm the free */
++
++ /* Retain a reference on this until the VPU has
++ * released it
++ */
++ buffer->vpu_state = VPU_UNMAPPING;
++ goto defer;
++ }
++ buffer->vpu_state = VPU_NOT_MAPPED;
++ buffer->vc_handle = 0;
++ }
++ if (buffer->vc_handle) {
++ /* We've sent the unmap request but not had the response. */
++ pr_err("[%s]: Waiting for VPU unmap response on %p\n",
++ __func__, buffer);
++ goto defer;
++ }
++ if (buffer->in_use) {
++ /* Don't release dmabuf here - we await the release */
++ pr_err("[%s]: buffer %p is still in use\n",
++ __func__, buffer);
++ goto defer;
++ }
++
++ /* Handle cleaning up imported dmabufs */
++ if (buffer->sgt) {
++ dma_buf_unmap_attachment(buffer->attach, buffer->sgt,
++ DMA_BIDIRECTIONAL);
++ buffer->sgt = NULL;
++ }
++ if (buffer->attach) {
++ dma_buf_detach(buffer->dma_buf, buffer->attach);
++ buffer->attach = NULL;
++ }
++
++ /* Release the dma_buf (whether ours or imported) */
++ if (buffer->import_dma_buf) {
++ dma_buf_put(buffer->import_dma_buf);
++ buffer->import_dma_buf = NULL;
++ buffer->dma_buf = NULL;
++ } else if (buffer->dma_buf) {
++ dma_buf_put(buffer->dma_buf);
++ buffer->dma_buf = NULL;
++ }
++
++ if (buffer->sg_table && !buffer->import_dma_buf) {
++ /* Our own allocation that we need to dma_unmap_sg */
++ dma_unmap_sg(&sm_state->pdev->dev, buffer->sg_table->sgl,
++ buffer->sg_table->nents, DMA_BIDIRECTIONAL);
++ }
++
++ /* Free the local resource. Start by removing it from the list */
++ buffer->private = NULL;
++ list_del(&buffer->global_buffer_list);
++
++ mutex_unlock(&buffer->lock);
++ mutex_unlock(&sm_state->map_lock);
++
++ mutex_destroy(&buffer->lock);
++
++ kfree(buffer);
++ return;
++
++defer:
++ mutex_unlock(&buffer->lock);
++ mutex_unlock(&sm_state->map_lock);
++}
++
++/* Create support for private data tracking. */
++static struct vc_sm_privdata_t *vc_sm_cma_create_priv_data(pid_t id)
++{
++ char alloc_name[32];
++ struct vc_sm_privdata_t *file_data = NULL;
++
++ /* Allocate private structure. */
++ file_data = kzalloc(sizeof(*file_data), GFP_KERNEL);
++
++ if (!file_data)
++ return NULL;
++
++ snprintf(alloc_name, sizeof(alloc_name), "%d", id);
++
++ file_data->pid = id;
++
++ return file_data;
++}
++
++/* Dma_buf operations for chaining through to an imported dma_buf */
++static
++int vc_sm_import_dma_buf_attach(struct dma_buf *dmabuf,
++ struct dma_buf_attachment *attachment)
++{
++ struct vc_sm_buffer *res = dmabuf->priv;
++
++ if (!res->import_dma_buf)
++ return -EINVAL;
++ return res->import_dma_buf->ops->attach(res->import_dma_buf,
++ attachment);
++}
++
++static
++void vc_sm_import_dma_buf_detatch(struct dma_buf *dmabuf,
++ struct dma_buf_attachment *attachment)
++{
++ struct vc_sm_buffer *res = dmabuf->priv;
++
++ if (!res->import_dma_buf)
++ return;
++ res->import_dma_buf->ops->detach(res->import_dma_buf, attachment);
++}
++
++static
++struct sg_table *vc_sm_import_map_dma_buf(struct dma_buf_attachment *attachment,
++ enum dma_data_direction direction)
++{
++ struct vc_sm_buffer *res = attachment->dmabuf->priv;
++
++ if (!res->import_dma_buf)
++ return NULL;
++ return res->import_dma_buf->ops->map_dma_buf(attachment, direction);
++}
++
++static
++void vc_sm_import_unmap_dma_buf(struct dma_buf_attachment *attachment,
++ struct sg_table *table,
++ enum dma_data_direction direction)
++{
++ struct vc_sm_buffer *res = attachment->dmabuf->priv;
++
++ if (!res->import_dma_buf)
++ return;
++ res->import_dma_buf->ops->unmap_dma_buf(attachment, table, direction);
++}
++
++static
++int vc_sm_import_dmabuf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
++{
++ struct vc_sm_buffer *res = dmabuf->priv;
++
++ pr_debug("%s: mmap dma_buf %p, res %p, imported db %p\n", __func__,
++ dmabuf, res, res->import_dma_buf);
++ if (!res->import_dma_buf) {
++ pr_err("%s: mmap dma_buf %p- not an imported buffer\n",
++ __func__, dmabuf);
++ return -EINVAL;
++ }
++ return res->import_dma_buf->ops->mmap(res->import_dma_buf, vma);
++}
++
++static
++void vc_sm_import_dma_buf_release(struct dma_buf *dmabuf)
++{
++ struct vc_sm_buffer *res = dmabuf->priv;
++
++ pr_debug("%s: Relasing dma_buf %p\n", __func__, dmabuf);
++ if (!res->import_dma_buf)
++ return;
++
++ res->in_use = 0;
++
++ vc_sm_release_resource(res, 0);
++}
++
++static
++void *vc_sm_import_dma_buf_kmap(struct dma_buf *dmabuf,
++ unsigned long offset)
++{
++ struct vc_sm_buffer *res = dmabuf->priv;
++
++ if (!res->import_dma_buf)
++ return NULL;
++ return res->import_dma_buf->ops->map(res->import_dma_buf,
++ offset);
++}
++
++static
++void vc_sm_import_dma_buf_kunmap(struct dma_buf *dmabuf,
++ unsigned long offset, void *ptr)
++{
++ struct vc_sm_buffer *res = dmabuf->priv;
++
++ if (!res->import_dma_buf)
++ return;
++ res->import_dma_buf->ops->unmap(res->import_dma_buf,
++ offset, ptr);
++}
++
++static
++int vc_sm_import_dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
++ enum dma_data_direction direction)
++{
++ struct vc_sm_buffer *res = dmabuf->priv;
++
++ if (!res->import_dma_buf)
++ return -EINVAL;
++ return res->import_dma_buf->ops->begin_cpu_access(res->import_dma_buf,
++ direction);
++}
++
++static
++int vc_sm_import_dma_buf_end_cpu_access(struct dma_buf *dmabuf,
++ enum dma_data_direction direction)
++{
++ struct vc_sm_buffer *res = dmabuf->priv;
++
++ if (!res->import_dma_buf)
++ return -EINVAL;
++ return res->import_dma_buf->ops->end_cpu_access(res->import_dma_buf,
++ direction);
++}
++
++static const struct dma_buf_ops dma_buf_import_ops = {
++ .map_dma_buf = vc_sm_import_map_dma_buf,
++ .unmap_dma_buf = vc_sm_import_unmap_dma_buf,
++ .mmap = vc_sm_import_dmabuf_mmap,
++ .release = vc_sm_import_dma_buf_release,
++ .attach = vc_sm_import_dma_buf_attach,
++ .detach = vc_sm_import_dma_buf_detatch,
++ .begin_cpu_access = vc_sm_import_dma_buf_begin_cpu_access,
++ .end_cpu_access = vc_sm_import_dma_buf_end_cpu_access,
++ .map = vc_sm_import_dma_buf_kmap,
++ .unmap = vc_sm_import_dma_buf_kunmap,
++};
++
++/* Import a dma_buf to be shared with VC. */
++int
++vc_sm_cma_import_dmabuf_internal(struct vc_sm_privdata_t *private,
++ struct dma_buf *dma_buf,
++ struct dma_buf **imported_buf)
++{
++ DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
++ struct vc_sm_buffer *buffer = NULL;
++ struct vc_sm_import import = { };
++ struct vc_sm_import_result result = { };
++ struct dma_buf_attachment *attach = NULL;
++ struct sg_table *sgt = NULL;
++ int ret = 0;
++ int status;
++
++ /* Setup our allocation parameters */
++ pr_debug("%s: importing dma_buf %p\n", __func__, dma_buf);
++
++ get_dma_buf(dma_buf);
++ dma_buf = dma_buf;
++
++ attach = dma_buf_attach(dma_buf, &sm_state->pdev->dev);
++ if (IS_ERR(attach)) {
++ ret = PTR_ERR(attach);
++ goto error;
++ }
++
++ sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
++ if (IS_ERR(sgt)) {
++ ret = PTR_ERR(sgt);
++ goto error;
++ }
++
++ /* Verify that the address block is contiguous */
++ if (sgt->nents != 1) {
++ ret = -ENOMEM;
++ goto error;
++ }
++
++ /* Allocate local buffer to track this allocation. */
++ buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
++ if (!buffer) {
++ ret = -ENOMEM;
++ goto error;
++ }
++
++ import.type = VC_SM_ALLOC_NON_CACHED;
++ import.addr = (uint32_t)sg_dma_address(sgt->sgl);
++ if ((import.addr & 0xC0000000) != 0xC0000000) {
++ pr_err("%s: Expecting an uncached alias for dma_addr %08x\n",
++ __func__, import.addr);
++ import.addr |= 0xC0000000;
++ }
++ import.size = sg_dma_len(sgt->sgl);
++ import.allocator = current->tgid;
++ import.kernel_id = (uint32_t)buffer; //FIXME: 64 bit support needed.
++
++ memcpy(import.name, VC_SM_RESOURCE_NAME_DEFAULT,
++ sizeof(VC_SM_RESOURCE_NAME_DEFAULT));
++
++ pr_debug("[%s]: attempt to import \"%s\" data - type %u, addr %p, size %u\n",
++ __func__, import.name, import.type, (void *)import.addr,
++ import.size);
++
++ /* Allocate the videocore buffer. */
++ status = vc_sm_cma_vchi_import(sm_state->sm_handle, &import, &result,
++ &sm_state->int_trans_id);
++ if (status == -EINTR) {
++ pr_debug("[%s]: requesting import memory action restart (trans_id: %u)\n",
++ __func__, sm_state->int_trans_id);
++ ret = -ERESTARTSYS;
++ private->restart_sys = -EINTR;
++ private->int_action = VC_SM_MSG_TYPE_IMPORT;
++ goto error;
++ } else if (status || !result.res_handle) {
++ pr_debug("[%s]: failed to import memory on videocore (status: %u, trans_id: %u)\n",
++ __func__, status, sm_state->int_trans_id);
++ ret = -ENOMEM;
++ goto error;
++ }
++
++ mutex_init(&buffer->lock);
++ INIT_LIST_HEAD(&buffer->attachments);
++ memcpy(buffer->name, import.name,
++ min(sizeof(buffer->name), sizeof(import.name) - 1));
++
++ /* Keep track of the buffer we created. */
++ buffer->private = private;
++ buffer->vc_handle = result.res_handle;
++ buffer->size = import.size;
++ buffer->vpu_state = VPU_MAPPED;
++
++ buffer->import_dma_buf = dma_buf;
++
++ buffer->attach = attach;
++ buffer->sgt = sgt;
++ buffer->dma_addr = sg_dma_address(sgt->sgl);
++ buffer->in_use = 1;
++
++ /*
++ * We're done - we need to export a new dmabuf chaining through most
++ * functions, but enabling us to release our own internal references
++ * here.
++ */
++ exp_info.ops = &dma_buf_import_ops;
++ exp_info.size = import.size;
++ exp_info.flags = O_RDWR;
++ exp_info.priv = buffer;
++
++ buffer->dma_buf = dma_buf_export(&exp_info);
++ if (IS_ERR(buffer->dma_buf)) {
++ ret = PTR_ERR(buffer->dma_buf);
++ goto error;
++ }
++
++ vc_sm_add_resource(private, buffer);
++
++ *imported_buf = buffer->dma_buf;
++
++ return 0;
++
++error:
++ if (result.res_handle) {
++ struct vc_sm_free_t free = { result.res_handle, 0 };
++
++ vc_sm_cma_vchi_free(sm_state->sm_handle, &free,
++ &sm_state->int_trans_id);
++ }
++ kfree(buffer);
++ if (sgt)
++ dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
++ if (attach)
++ dma_buf_detach(dma_buf, attach);
++ dma_buf_put(dma_buf);
++ return ret;
++}
++
++/* FIXME: Pass a function pointer to this into vc_vchi_sm.c */
++void
++vc_sm_vpu_event(struct sm_instance *instance, struct vc_sm_result_t *reply,
++ int reply_len)
++{
++ switch (reply->trans_id & ~0x80000000) {
++ case VC_SM_MSG_TYPE_CLIENT_VERSION:
++ {
++ /* Acknowledge that the firmware supports the version command */
++ pr_debug("%s: firmware acked version msg. Require release cb\n",
++ __func__);
++ sm_state->require_released_callback = true;
++ }
++ break;
++ case VC_SM_MSG_TYPE_RELEASED:
++ {
++ struct vc_sm_released *release = (struct vc_sm_released *)reply;
++ struct vc_sm_buffer *buffer =
++ (struct vc_sm_buffer *)release->kernel_id;
++
++ /*
++ * FIXME: Need to check buffer is still valid and allocated
++ * before continuing
++ */
++ pr_debug("%s: Released addr %08x, size %u, id %08x, mem_handle %08x\n",
++ __func__, release->addr, release->size,
++ release->kernel_id, release->vc_handle);
++ mutex_lock(&buffer->lock);
++ buffer->vc_handle = 0;
++ buffer->vpu_state = VPU_NOT_MAPPED;
++ mutex_unlock(&buffer->lock);
++
++ vc_sm_release_resource(buffer, 0);
++ }
++ break;
++ default:
++ pr_err("%s: Unknown vpu cmd %x\n", __func__, reply->trans_id);
++ break;
++ }
++}
++
++/* Videocore connected. */
++static void vc_sm_connected_init(void)
++{
++ int ret;
++ VCHI_INSTANCE_T vchi_instance;
++ struct vc_sm_version version;
++ struct vc_sm_result_t version_result;
++
++ pr_info("[%s]: start\n", __func__);
++
++ /*
++ * Initialize and create a VCHI connection for the shared memory service
++ * running on videocore.
++ */
++ ret = vchi_initialise(&vchi_instance);
++ if (ret) {
++ pr_err("[%s]: failed to initialise VCHI instance (ret=%d)\n",
++ __func__, ret);
++
++ ret = -EIO;
++ goto err_free_mem;
++ }
++
++ ret = vchi_connect(vchi_instance);
++ if (ret) {
++ pr_err("[%s]: failed to connect VCHI instance (ret=%d)\n",
++ __func__, ret);
++
++ ret = -EIO;
++ goto err_free_mem;
++ }
++
++ /* Initialize an instance of the shared memory service. */
++ sm_state->sm_handle = vc_sm_cma_vchi_init(vchi_instance, 1,
++ vc_sm_vpu_event);
++ if (!sm_state->sm_handle) {
++ pr_err("[%s]: failed to initialize shared memory service\n",
++ __func__);
++
++ ret = -EPERM;
++ goto err_free_mem;
++ }
++
++ /* Create a debug fs directory entry (root). */
++ sm_state->dir_root = debugfs_create_dir(VC_SM_DIR_ROOT_NAME, NULL);
++ if (!sm_state->dir_root) {
++ pr_err("[%s]: failed to create \'%s\' directory entry\n",
++ __func__, VC_SM_DIR_ROOT_NAME);
++
++ ret = -EPERM;
++ goto err_stop_sm_service;
++ }
++
++ sm_state->dir_state.show = &vc_sm_cma_global_state_show;
++ sm_state->dir_state.dir_entry =
++ debugfs_create_file(VC_SM_STATE, 0444, sm_state->dir_root,
++ &sm_state->dir_state,
++ &vc_sm_cma_debug_fs_fops);
++
++ INIT_LIST_HEAD(&sm_state->buffer_list);
++
++ sm_state->data_knl = vc_sm_cma_create_priv_data(0);
++ if (!sm_state->data_knl) {
++ pr_err("[%s]: failed to create kernel private data tracker\n",
++ __func__);
++ goto err_remove_shared_memory;
++ }
++
++ version.version = 1;
++ ret = vc_sm_cma_vchi_client_version(sm_state->sm_handle, &version,
++ &version_result,
++ &sm_state->int_trans_id);
++ if (ret) {
++ pr_err("[%s]: Failed to send version request %d\n", __func__,
++ ret);
++ }
++
++ /* Done! */
++ sm_inited = 1;
++ pr_info("[%s]: installed successfully\n", __func__);
++ return;
++
++err_remove_shared_memory:
++ debugfs_remove_recursive(sm_state->dir_root);
++err_stop_sm_service:
++ vc_sm_cma_vchi_stop(&sm_state->sm_handle);
++err_free_mem:
++ kfree(sm_state);
++ pr_info("[%s]: failed, ret %d\n", __func__, ret);
++}
++
++/* Driver loading. */
++static int bcm2835_vc_sm_cma_probe(struct platform_device *pdev)
++{
++ struct device *dev = &pdev->dev;
++ int err;
++
++ pr_info("%s: Videocore shared memory driver\n", __func__);
++
++ sm_state = kzalloc(sizeof(*sm_state), GFP_KERNEL);
++ if (!sm_state)
++ return -ENOMEM;
++ sm_state->pdev = pdev;
++ mutex_init(&sm_state->map_lock);
++
++ dev->coherent_dma_mask = DMA_BIT_MASK(32);
++ dev->dma_mask = &dev->coherent_dma_mask;
++ err = of_dma_configure(dev, NULL, true);
++ if (err) {
++ dev_err(dev, "Unable to setup DMA: %d\n", err);
++ return err;
++ }
++
++ vchiq_add_connected_callback(vc_sm_connected_init);
++ return 0;
++}
++
++/* Driver unloading. */
++static int bcm2835_vc_sm_cma_remove(struct platform_device *pdev)
++{
++ pr_debug("[%s]: start\n", __func__);
++ if (sm_inited) {
++ /* Remove shared memory device. */
++ misc_deregister(&sm_state->dev);
++
++ /* Remove all proc entries. */
++ //debugfs_remove_recursive(sm_state->dir_root);
++
++ /* Stop the videocore shared memory service. */
++ vc_sm_cma_vchi_stop(&sm_state->sm_handle);
++
++ /* Free the memory for the state structure. */
++ mutex_destroy(&sm_state->map_lock);
++ kfree(sm_state);
++ }
++
++ pr_debug("[%s]: end\n", __func__);
++ return 0;
++}
++
++/* Get an internal resource handle mapped from the external one. */
++int vc_sm_cma_int_handle(int handle)
++{
++ struct dma_buf *dma_buf = (struct dma_buf *)handle;
++ struct vc_sm_buffer *res;
++
++ /* Validate we can work with this device. */
++ if (!sm_state || !handle) {
++ pr_err("[%s]: invalid input\n", __func__);
++ return 0;
++ }
++
++ res = (struct vc_sm_buffer *)dma_buf->priv;
++ return res->vc_handle;
++}
++EXPORT_SYMBOL_GPL(vc_sm_cma_int_handle);
++
++/* Free a previously allocated shared memory handle and block. */
++int vc_sm_cma_free(int handle)
++{
++ struct dma_buf *dma_buf = (struct dma_buf *)handle;
++
++ /* Validate we can work with this device. */
++ if (!sm_state || !handle) {
++ pr_err("[%s]: invalid input\n", __func__);
++ return -EPERM;
++ }
++
++ pr_debug("%s: handle %08x/dmabuf %p\n", __func__, handle, dma_buf);
++
++ dma_buf_put(dma_buf);
++
++ return 0;
++}
++EXPORT_SYMBOL_GPL(vc_sm_cma_free);
++
++/* Import a dmabuf to be shared with VC. */
++int vc_sm_cma_import_dmabuf(struct dma_buf *src_dmabuf, int *handle)
++{
++ struct dma_buf *new_dma_buf;
++ struct vc_sm_buffer *res;
++ int ret;
++
++ /* Validate we can work with this device. */
++ if (!sm_state || !src_dmabuf || !handle) {
++ pr_err("[%s]: invalid input\n", __func__);
++ return -EPERM;
++ }
++
++ ret = vc_sm_cma_import_dmabuf_internal(sm_state->data_knl, src_dmabuf,
++ &new_dma_buf);
++
++ if (!ret) {
++ pr_debug("%s: imported to ptr %p\n", __func__, new_dma_buf);
++ res = (struct vc_sm_buffer *)new_dma_buf->priv;
++
++ /* Assign valid handle at this time.*/
++ *handle = (int)new_dma_buf;
++ } else {
++ /*
++ * succeeded in importing the dma_buf, but then
++ * failed to look it up again. How?
++ * Release the fd again.
++ */
++ pr_err("%s: imported vc_sm_cma_get_buffer failed %d\n",
++ __func__, ret);
++ }
++
++ return ret;
++}
++EXPORT_SYMBOL_GPL(vc_sm_cma_import_dmabuf);
++
++static struct platform_driver bcm2835_vcsm_cma_driver = {
++ .probe = bcm2835_vc_sm_cma_probe,
++ .remove = bcm2835_vc_sm_cma_remove,
++ .driver = {
++ .name = DEVICE_NAME,
++ .owner = THIS_MODULE,
++ },
++};
++
++module_platform_driver(bcm2835_vcsm_cma_driver);
++
++MODULE_AUTHOR("Dave Stevenson");
++MODULE_DESCRIPTION("VideoCore CMA Shared Memory Driver");
++MODULE_LICENSE("GPL v2");
++MODULE_ALIAS("platform:vcsm-cma");
+--- /dev/null
++++ b/drivers/staging/vc04_services/vc-sm-cma/vc_sm.h
+@@ -0,0 +1,59 @@
++/* SPDX-License-Identifier: GPL-2.0 */
++
++/*
++ * VideoCore Shared Memory driver using CMA.
++ *
++ * Copyright: 2018, Raspberry Pi (Trading) Ltd
++ *
++ */
++
++#ifndef VC_SM_H
++#define VC_SM_H
++
++#include <linux/device.h>
++#include <linux/dma-direction.h>
++#include <linux/kref.h>
++#include <linux/mm_types.h>
++#include <linux/mutex.h>
++#include <linux/rbtree.h>
++#include <linux/sched.h>
++#include <linux/shrinker.h>
++#include <linux/types.h>
++#include <linux/miscdevice.h>
++
++#define VC_SM_MAX_NAME_LEN 32
++
++enum vc_sm_vpu_mapping_state {
++ VPU_NOT_MAPPED,
++ VPU_MAPPED,
++ VPU_UNMAPPING
++};
++
++struct vc_sm_buffer {
++ struct list_head global_buffer_list; /* Global list of buffers. */
++
++ size_t size;
++
++ /* Lock over all the following state for this buffer */
++ struct mutex lock;
++ struct sg_table *sg_table;
++ struct list_head attachments;
++
++ char name[VC_SM_MAX_NAME_LEN];
++
++ int in_use:1; /* Kernel is still using this resource */
++
++ enum vc_sm_vpu_mapping_state vpu_state;
++ u32 vc_handle; /* VideoCore handle for this buffer */
++
++ /* DMABUF related fields */
++ struct dma_buf *import_dma_buf;
++ struct dma_buf *dma_buf;
++ struct dma_buf_attachment *attach;
++ struct sg_table *sgt;
++ dma_addr_t dma_addr;
++
++ struct vc_sm_privdata_t *private;
++};
++
++#endif
+--- /dev/null
++++ b/drivers/staging/vc04_services/vc-sm-cma/vc_sm_cma_vchi.c
+@@ -0,0 +1,498 @@
++// SPDX-License-Identifier: GPL-2.0
++/*
++ * VideoCore Shared Memory CMA allocator
++ *
++ * Copyright: 2018, Raspberry Pi (Trading) Ltd
++ * Copyright 2011-2012 Broadcom Corporation. All rights reserved.
++ *
++ * Based on vmcs_sm driver from Broadcom Corporation.
++ *
++ */
++
++/* ---- Include Files ----------------------------------------------------- */
++#include <linux/completion.h>
++#include <linux/kernel.h>
++#include <linux/kthread.h>
++#include <linux/list.h>
++#include <linux/mutex.h>
++#include <linux/semaphore.h>
++#include <linux/slab.h>
++#include <linux/types.h>
++
++#include "vc_sm_cma_vchi.h"
++
++#define VC_SM_VER 1
++#define VC_SM_MIN_VER 0
++
++/* ---- Private Constants and Types -------------------------------------- */
++
++/* Command blocks come from a pool */
++#define SM_MAX_NUM_CMD_RSP_BLKS 32
++
++struct sm_cmd_rsp_blk {
++ struct list_head head; /* To create lists */
++ /* To be signaled when the response is there */
++ struct completion cmplt;
++
++ u16 id;
++ u16 length;
++
++ u8 msg[VC_SM_MAX_MSG_LEN];
++
++ uint32_t wait:1;
++ uint32_t sent:1;
++ uint32_t alloc:1;
++
++};
++
++struct sm_instance {
++ u32 num_connections;
++ VCHI_SERVICE_HANDLE_T vchi_handle[VCHI_MAX_NUM_CONNECTIONS];
++ struct task_struct *io_thread;
++ struct completion io_cmplt;
++
++ vpu_event_cb vpu_event;
++
++ /* Mutex over the following lists */
++ struct mutex lock;
++ u32 trans_id;
++ struct list_head cmd_list;
++ struct list_head rsp_list;
++ struct list_head dead_list;
++
++ struct sm_cmd_rsp_blk free_blk[SM_MAX_NUM_CMD_RSP_BLKS];
++
++ /* Mutex over the free_list */
++ struct mutex free_lock;
++ struct list_head free_list;
++
++ struct semaphore free_sema;
++
++};
++
++/* ---- Private Variables ------------------------------------------------ */
++
++/* ---- Private Function Prototypes -------------------------------------- */
++
++/* ---- Private Functions ------------------------------------------------ */
++static int
++bcm2835_vchi_msg_queue(VCHI_SERVICE_HANDLE_T handle,
++ void *data,
++ unsigned int size)
++{
++ return vchi_queue_kernel_message(handle,
++ data,
++ size);
++}
++
++static struct
++sm_cmd_rsp_blk *vc_vchi_cmd_create(struct sm_instance *instance,
++ enum vc_sm_msg_type id, void *msg,
++ u32 size, int wait)
++{
++ struct sm_cmd_rsp_blk *blk;
++ struct vc_sm_msg_hdr_t *hdr;
++
++ if (down_interruptible(&instance->free_sema)) {
++ blk = kmalloc(sizeof(*blk), GFP_KERNEL);
++ if (!blk)
++ return NULL;
++
++ blk->alloc = 1;
++ init_completion(&blk->cmplt);
++ } else {
++ mutex_lock(&instance->free_lock);
++ blk =
++ list_first_entry(&instance->free_list,
++ struct sm_cmd_rsp_blk, head);
++ list_del(&blk->head);
++ mutex_unlock(&instance->free_lock);
++ }
++
++ blk->sent = 0;
++ blk->wait = wait;
++ blk->length = sizeof(*hdr) + size;
++
++ hdr = (struct vc_sm_msg_hdr_t *)blk->msg;
++ hdr->type = id;
++ mutex_lock(&instance->lock);
++ instance->trans_id++;
++ /*
++ * Retain the top bit for identifying asynchronous events, or VPU cmds.
++ */
++ instance->trans_id &= ~0x80000000;
++ hdr->trans_id = instance->trans_id;
++ blk->id = instance->trans_id;
++ mutex_unlock(&instance->lock);
++
++ if (size)
++ memcpy(hdr->body, msg, size);
++
++ return blk;
++}
++
++static void
++vc_vchi_cmd_delete(struct sm_instance *instance, struct sm_cmd_rsp_blk *blk)
++{
++ if (blk->alloc) {
++ kfree(blk);
++ return;
++ }
++
++ mutex_lock(&instance->free_lock);
++ list_add(&blk->head, &instance->free_list);
++ mutex_unlock(&instance->free_lock);
++ up(&instance->free_sema);
++}
++
++static void vc_sm_cma_vchi_rx_ack(struct sm_instance *instance,
++ struct sm_cmd_rsp_blk *cmd,
++ struct vc_sm_result_t *reply,
++ u32 reply_len)
++{
++ mutex_lock(&instance->lock);
++ list_for_each_entry(cmd,
++ &instance->rsp_list,
++ head) {
++ if (cmd->id == reply->trans_id)
++ break;
++ }
++ mutex_unlock(&instance->lock);
++
++ if (&cmd->head == &instance->rsp_list) {
++ //pr_debug("%s: received response %u, throw away...",
++ pr_err("%s: received response %u, throw away...",
++ __func__,
++ reply->trans_id);
++ } else if (reply_len > sizeof(cmd->msg)) {
++ pr_err("%s: reply too big (%u) %u, throw away...",
++ __func__, reply_len,
++ reply->trans_id);
++ } else {
++ memcpy(cmd->msg, reply,
++ reply_len);
++ complete(&cmd->cmplt);
++ }
++}
++
++static int vc_sm_cma_vchi_videocore_io(void *arg)
++{
++ struct sm_instance *instance = arg;
++ struct sm_cmd_rsp_blk *cmd = NULL, *cmd_tmp;
++ struct vc_sm_result_t *reply;
++ u32 reply_len;
++ s32 status;
++ int svc_use = 1;
++
++ while (1) {
++ if (svc_use)
++ vchi_service_release(instance->vchi_handle[0]);
++ svc_use = 0;
++ if (!wait_for_completion_interruptible(&instance->io_cmplt)) {
++ vchi_service_use(instance->vchi_handle[0]);
++ svc_use = 1;
++
++ do {
++ /*
++ * Get new command and move it to response list
++ */
++ mutex_lock(&instance->lock);
++ if (list_empty(&instance->cmd_list)) {
++ /* no more commands to process */
++ mutex_unlock(&instance->lock);
++ break;
++ }
++ cmd =
++ list_first_entry(&instance->cmd_list,
++ struct sm_cmd_rsp_blk,
++ head);
++ list_move(&cmd->head, &instance->rsp_list);
++ cmd->sent = 1;
++ mutex_unlock(&instance->lock);
++
++ /* Send the command */
++ status = bcm2835_vchi_msg_queue(
++ instance->vchi_handle[0],
++ cmd->msg, cmd->length);
++ if (status) {
++ pr_err("%s: failed to queue message (%d)",
++ __func__, status);
++ }
++
++ /* If no reply is needed then we're done */
++ if (!cmd->wait) {
++ mutex_lock(&instance->lock);
++ list_del(&cmd->head);
++ mutex_unlock(&instance->lock);
++ vc_vchi_cmd_delete(instance, cmd);
++ continue;
++ }
++
++ if (status) {
++ complete(&cmd->cmplt);
++ continue;
++ }
++
++ } while (1);
++
++ while (!vchi_msg_peek(instance->vchi_handle[0],
++ (void **)&reply, &reply_len,
++ VCHI_FLAGS_NONE)) {
++ if (reply->trans_id & 0x80000000) {
++ /* Async event or cmd from the VPU */
++ if (instance->vpu_event)
++ instance->vpu_event(
++ instance, reply,
++ reply_len);
++ } else {
++ vc_sm_cma_vchi_rx_ack(instance, cmd,
++ reply, reply_len);
++ }
++
++ vchi_msg_remove(instance->vchi_handle[0]);
++ }
++
++ /* Go through the dead list and free them */
++ mutex_lock(&instance->lock);
++ list_for_each_entry_safe(cmd, cmd_tmp,
++ &instance->dead_list, head) {
++ list_del(&cmd->head);
++ vc_vchi_cmd_delete(instance, cmd);
++ }
++ mutex_unlock(&instance->lock);
++ }
++ }
++
++ return 0;
++}
++
++static void vc_sm_cma_vchi_callback(void *param,
++ const VCHI_CALLBACK_REASON_T reason,
++ void *msg_handle)
++{
++ struct sm_instance *instance = param;
++
++ (void)msg_handle;
++
++ switch (reason) {
++ case VCHI_CALLBACK_MSG_AVAILABLE:
++ complete(&instance->io_cmplt);
++ break;
++
++ case VCHI_CALLBACK_SERVICE_CLOSED:
++ pr_info("%s: service CLOSED!!", __func__);
++ default:
++ break;
++ }
++}
++
++struct sm_instance *vc_sm_cma_vchi_init(VCHI_INSTANCE_T vchi_instance,
++ unsigned int num_connections,
++ vpu_event_cb vpu_event)
++{
++ u32 i;
++ struct sm_instance *instance;
++ int status;
++
++ pr_debug("%s: start", __func__);
++
++ if (num_connections > VCHI_MAX_NUM_CONNECTIONS) {
++ pr_err("%s: unsupported number of connections %u (max=%u)",
++ __func__, num_connections, VCHI_MAX_NUM_CONNECTIONS);
++
++ goto err_null;
++ }
++ /* Allocate memory for this instance */
++ instance = kzalloc(sizeof(*instance), GFP_KERNEL);
++
++ /* Misc initialisations */
++ mutex_init(&instance->lock);
++ init_completion(&instance->io_cmplt);
++ INIT_LIST_HEAD(&instance->cmd_list);
++ INIT_LIST_HEAD(&instance->rsp_list);
++ INIT_LIST_HEAD(&instance->dead_list);
++ INIT_LIST_HEAD(&instance->free_list);
++ sema_init(&instance->free_sema, SM_MAX_NUM_CMD_RSP_BLKS);
++ mutex_init(&instance->free_lock);
++ for (i = 0; i < SM_MAX_NUM_CMD_RSP_BLKS; i++) {
++ init_completion(&instance->free_blk[i].cmplt);
++ list_add(&instance->free_blk[i].head, &instance->free_list);
++ }
++
++ /* Open the VCHI service connections */
++ instance->num_connections = num_connections;
++ for (i = 0; i < num_connections; i++) {
++ SERVICE_CREATION_T params = {
++ .version = VCHI_VERSION_EX(VC_SM_VER, VC_SM_MIN_VER),
++ .service_id = VC_SM_SERVER_NAME,
++ .callback = vc_sm_cma_vchi_callback,
++ .callback_param = instance,
++ };
++
++ status = vchi_service_open(vchi_instance,
++ &params, &instance->vchi_handle[i]);
++ if (status) {
++ pr_err("%s: failed to open VCHI service (%d)",
++ __func__, status);
++
++ goto err_close_services;
++ }
++ }
++
++ /* Create the thread which takes care of all io to/from videoocore. */
++ instance->io_thread = kthread_create(&vc_sm_cma_vchi_videocore_io,
++ (void *)instance, "SMIO");
++ if (!instance->io_thread) {
++ pr_err("%s: failed to create SMIO thread", __func__);
++
++ goto err_close_services;
++ }
++ instance->vpu_event = vpu_event;
++ set_user_nice(instance->io_thread, -10);
++ wake_up_process(instance->io_thread);
++
++ pr_debug("%s: success - instance 0x%x", __func__,
++ (unsigned int)instance);
++ return instance;
++
++err_close_services:
++ for (i = 0; i < instance->num_connections; i++) {
++ if (instance->vchi_handle[i])
++ vchi_service_close(instance->vchi_handle[i]);
++ }
++ kfree(instance);
++err_null:
++ pr_debug("%s: FAILED", __func__);
++ return NULL;
++}
++
++int vc_sm_cma_vchi_stop(struct sm_instance **handle)
++{
++ struct sm_instance *instance;
++ u32 i;
++
++ if (!handle) {
++ pr_err("%s: invalid pointer to handle %p", __func__, handle);
++ goto lock;
++ }
++
++ if (!*handle) {
++ pr_err("%s: invalid handle %p", __func__, *handle);
++ goto lock;
++ }
++
++ instance = *handle;
++
++ /* Close all VCHI service connections */
++ for (i = 0; i < instance->num_connections; i++) {
++ s32 success;
++
++ vchi_service_use(instance->vchi_handle[i]);
++
++ success = vchi_service_close(instance->vchi_handle[i]);
++ }
++
++ kfree(instance);
++
++ *handle = NULL;
++ return 0;
++
++lock:
++ return -EINVAL;
++}
++
++static int vc_sm_cma_vchi_send_msg(struct sm_instance *handle,
++ enum vc_sm_msg_type msg_id, void *msg,
++ u32 msg_size, void *result, u32 result_size,
++ u32 *cur_trans_id, u8 wait_reply)
++{
++ int status = 0;
++ struct sm_instance *instance = handle;
++ struct sm_cmd_rsp_blk *cmd_blk;
++
++ if (!handle) {
++ pr_err("%s: invalid handle", __func__);
++ return -EINVAL;
++ }
++ if (!msg) {
++ pr_err("%s: invalid msg pointer", __func__);
++ return -EINVAL;
++ }
++
++ cmd_blk =
++ vc_vchi_cmd_create(instance, msg_id, msg, msg_size, wait_reply);
++ if (!cmd_blk) {
++ pr_err("[%s]: failed to allocate global tracking resource",
++ __func__);
++ return -ENOMEM;
++ }
++
++ if (cur_trans_id)
++ *cur_trans_id = cmd_blk->id;
++
++ mutex_lock(&instance->lock);
++ list_add_tail(&cmd_blk->head, &instance->cmd_list);
++ mutex_unlock(&instance->lock);
++ complete(&instance->io_cmplt);
++
++ if (!wait_reply)
++ /* We're done */
++ return 0;
++
++ /* Wait for the response */
++ if (wait_for_completion_interruptible(&cmd_blk->cmplt)) {
++ mutex_lock(&instance->lock);
++ if (!cmd_blk->sent) {
++ list_del(&cmd_blk->head);
++ mutex_unlock(&instance->lock);
++ vc_vchi_cmd_delete(instance, cmd_blk);
++ return -ENXIO;
++ }
++
++ list_move(&cmd_blk->head, &instance->dead_list);
++ mutex_unlock(&instance->lock);
++ complete(&instance->io_cmplt);
++ return -EINTR; /* We're done */
++ }
++
++ if (result && result_size) {
++ memcpy(result, cmd_blk->msg, result_size);
++ } else {
++ struct vc_sm_result_t *res =
++ (struct vc_sm_result_t *)cmd_blk->msg;
++ status = (res->success == 0) ? 0 : -ENXIO;
++ }
++
++ mutex_lock(&instance->lock);
++ list_del(&cmd_blk->head);
++ mutex_unlock(&instance->lock);
++ vc_vchi_cmd_delete(instance, cmd_blk);
++ return status;
++}
++
++int vc_sm_cma_vchi_free(struct sm_instance *handle, struct vc_sm_free_t *msg,
++ u32 *cur_trans_id)
++{
++ return vc_sm_cma_vchi_send_msg(handle, VC_SM_MSG_TYPE_FREE,
++ msg, sizeof(*msg), 0, 0, cur_trans_id, 0);
++}
++
++int vc_sm_cma_vchi_import(struct sm_instance *handle, struct vc_sm_import *msg,
++ struct vc_sm_import_result *result, u32 *cur_trans_id)
++{
++ return vc_sm_cma_vchi_send_msg(handle, VC_SM_MSG_TYPE_IMPORT,
++ msg, sizeof(*msg), result, sizeof(*result),
++ cur_trans_id, 1);
++}
++
++int vc_sm_cma_vchi_client_version(struct sm_instance *handle,
++ struct vc_sm_version *msg,
++ struct vc_sm_result_t *result,
++ u32 *cur_trans_id)
++{
++ return vc_sm_cma_vchi_send_msg(handle, VC_SM_MSG_TYPE_CLIENT_VERSION,
++ //msg, sizeof(*msg), result, sizeof(*result),
++ //cur_trans_id, 1);
++ msg, sizeof(*msg), NULL, 0,
++ cur_trans_id, 0);
++}
+--- /dev/null
++++ b/drivers/staging/vc04_services/vc-sm-cma/vc_sm_cma_vchi.h
+@@ -0,0 +1,59 @@
++/* SPDX-License-Identifier: GPL-2.0 */
++
++/*
++ * VideoCore Shared Memory CMA allocator
++ *
++ * Copyright: 2018, Raspberry Pi (Trading) Ltd
++ * Copyright 2011-2012 Broadcom Corporation. All rights reserved.
++ *
++ * Based on vmcs_sm driver from Broadcom Corporation.
++ *
++ */
++
++#ifndef __VC_SM_CMA_VCHI_H__INCLUDED__
++#define __VC_SM_CMA_VCHI_H__INCLUDED__
++
++#include "interface/vchi/vchi.h"
++
++#include "vc_sm_defs.h"
++
++/*
++ * Forward declare.
++ */
++struct sm_instance;
++
++typedef void (*vpu_event_cb)(struct sm_instance *instance,
++ struct vc_sm_result_t *reply, int reply_len);
++
++/*
++ * Initialize the shared memory service, opens up vchi connection to talk to it.
++ */
++struct sm_instance *vc_sm_cma_vchi_init(VCHI_INSTANCE_T vchi_instance,
++ unsigned int num_connections,
++ vpu_event_cb vpu_event);
++
++/*
++ * Terminates the shared memory service.
++ */
++int vc_sm_cma_vchi_stop(struct sm_instance **handle);
++
++/*
++ * Ask the shared memory service to free up some memory that was previously
++ * allocated by the vc_sm_cma_vchi_alloc function call.
++ */
++int vc_sm_cma_vchi_free(struct sm_instance *handle, struct vc_sm_free_t *msg,
++ u32 *cur_trans_id);
++
++/*
++ * Import a contiguous block of memory and wrap it in a GPU MEM_HANDLE_T.
++ */
++int vc_sm_cma_vchi_import(struct sm_instance *handle, struct vc_sm_import *msg,
++ struct vc_sm_import_result *result,
++ u32 *cur_trans_id);
++
++int vc_sm_cma_vchi_client_version(struct sm_instance *handle,
++ struct vc_sm_version *msg,
++ struct vc_sm_result_t *result,
++ u32 *cur_trans_id);
++
++#endif /* __VC_SM_CMA_VCHI_H__INCLUDED__ */
+--- /dev/null
++++ b/drivers/staging/vc04_services/vc-sm-cma/vc_sm_defs.h
+@@ -0,0 +1,298 @@
++/* SPDX-License-Identifier: GPL-2.0 */
++
++/*
++ * VideoCore Shared Memory CMA allocator
++ *
++ * Copyright: 2018, Raspberry Pi (Trading) Ltd
++ *
++ * Based on vc_sm_defs.h from the vmcs_sm driver Copyright Broadcom Corporation.
++ * All IPC messages are copied across to this file, even if the vc-sm-cma
++ * driver is not currently using them.
++ *
++ ****************************************************************************
++ */
++
++#ifndef __VC_SM_DEFS_H__INCLUDED__
++#define __VC_SM_DEFS_H__INCLUDED__
++
++/* FourCC code used for VCHI connection */
++#define VC_SM_SERVER_NAME MAKE_FOURCC("SMEM")
++
++/* Maximum message length */
++#define VC_SM_MAX_MSG_LEN (sizeof(union vc_sm_msg_union_t) + \
++ sizeof(struct vc_sm_msg_hdr_t))
++#define VC_SM_MAX_RSP_LEN (sizeof(union vc_sm_msg_union_t))
++
++/* Resource name maximum size */
++#define VC_SM_RESOURCE_NAME 32
++
++/*
++ * Version to be reported to the VPU
++ * VPU assumes 0 (aka 1) which does not require the released callback, nor
++ * expect the client to handle VC_MEM_REQUESTS.
++ * Version 2 requires the released callback, and must support VC_MEM_REQUESTS.
++ */
++#define VC_SM_PROTOCOL_VERSION 2
++
++enum vc_sm_msg_type {
++ /* Message types supported for HOST->VC direction */
++
++ /* Allocate shared memory block */
++ VC_SM_MSG_TYPE_ALLOC,
++ /* Lock allocated shared memory block */
++ VC_SM_MSG_TYPE_LOCK,
++ /* Unlock allocated shared memory block */
++ VC_SM_MSG_TYPE_UNLOCK,
++ /* Unlock allocated shared memory block, do not answer command */
++ VC_SM_MSG_TYPE_UNLOCK_NOANS,
++ /* Free shared memory block */
++ VC_SM_MSG_TYPE_FREE,
++ /* Resize a shared memory block */
++ VC_SM_MSG_TYPE_RESIZE,
++ /* Walk the allocated shared memory block(s) */
++ VC_SM_MSG_TYPE_WALK_ALLOC,
++
++ /* A previously applied action will need to be reverted */
++ VC_SM_MSG_TYPE_ACTION_CLEAN,
++
++ /*
++ * Import a physical address and wrap into a MEM_HANDLE_T.
++ * Release with VC_SM_MSG_TYPE_FREE.
++ */
++ VC_SM_MSG_TYPE_IMPORT,
++ /*
++ *Tells VC the protocol version supported by this client.
++ * 2 supports the async/cmd messages from the VPU for final release
++ * of memory, and for VC allocations.
++ */
++ VC_SM_MSG_TYPE_CLIENT_VERSION,
++ /* Response to VC request for memory */
++ VC_SM_MSG_TYPE_VC_MEM_REQUEST_REPLY,
++
++ /*
++ * Asynchronous/cmd messages supported for VC->HOST direction.
++ * Signalled by setting the top bit in vc_sm_result_t trans_id.
++ */
++
++ /*
++ * VC has finished with an imported memory allocation.
++ * Release any Linux reference counts on the underlying block.
++ */
++ VC_SM_MSG_TYPE_RELEASED,
++ /* VC request for memory */
++ VC_SM_MSG_TYPE_VC_MEM_REQUEST,
++
++ VC_SM_MSG_TYPE_MAX
++};
++
++/* Type of memory to be allocated */
++enum vc_sm_alloc_type_t {
++ VC_SM_ALLOC_CACHED,
++ VC_SM_ALLOC_NON_CACHED,
++};
++
++/* Message header for all messages in HOST->VC direction */
++struct vc_sm_msg_hdr_t {
++ u32 type;
++ u32 trans_id;
++ u8 body[0];
++
++};
++
++/* Request to allocate memory (HOST->VC) */
++struct vc_sm_alloc_t {
++ /* type of memory to allocate */
++ enum vc_sm_alloc_type_t type;
++ /* byte amount of data to allocate per unit */
++ u32 base_unit;
++ /* number of unit to allocate */
++ u32 num_unit;
++ /* alignment to be applied on allocation */
++ u32 alignment;
++ /* identity of who allocated this block */
++ u32 allocator;
++ /* resource name (for easier tracking on vc side) */
++ char name[VC_SM_RESOURCE_NAME];
++
++};
++
++/* Result of a requested memory allocation (VC->HOST) */
++struct vc_sm_alloc_result_t {
++ /* Transaction identifier */
++ u32 trans_id;
++
++ /* Resource handle */
++ u32 res_handle;
++ /* Pointer to resource buffer */
++ u32 res_mem;
++ /* Resource base size (bytes) */
++ u32 res_base_size;
++ /* Resource number */
++ u32 res_num;
++
++};
++
++/* Request to free a previously allocated memory (HOST->VC) */
++struct vc_sm_free_t {
++ /* Resource handle (returned from alloc) */
++ u32 res_handle;
++ /* Resource buffer (returned from alloc) */
++ u32 res_mem;
++
++};
++
++/* Request to lock a previously allocated memory (HOST->VC) */
++struct vc_sm_lock_unlock_t {
++ /* Resource handle (returned from alloc) */
++ u32 res_handle;
++ /* Resource buffer (returned from alloc) */
++ u32 res_mem;
++
++};
++
++/* Request to resize a previously allocated memory (HOST->VC) */
++struct vc_sm_resize_t {
++ /* Resource handle (returned from alloc) */
++ u32 res_handle;
++ /* Resource buffer (returned from alloc) */
++ u32 res_mem;
++ /* Resource *new* size requested (bytes) */
++ u32 res_new_size;
++
++};
++
++/* Result of a requested memory lock (VC->HOST) */
++struct vc_sm_lock_result_t {
++ /* Transaction identifier */
++ u32 trans_id;
++
++ /* Resource handle */
++ u32 res_handle;
++ /* Pointer to resource buffer */
++ u32 res_mem;
++ /*
++ * Pointer to former resource buffer if the memory
++ * was reallocated
++ */
++ u32 res_old_mem;
++
++};
++
++/* Generic result for a request (VC->HOST) */
++struct vc_sm_result_t {
++ /* Transaction identifier */
++ u32 trans_id;
++
++ s32 success;
++
++};
++
++/* Request to revert a previously applied action (HOST->VC) */
++struct vc_sm_action_clean_t {
++ /* Action of interest */
++ enum vc_sm_msg_type res_action;
++ /* Transaction identifier for the action of interest */
++ u32 action_trans_id;
++
++};
++
++/* Request to remove all data associated with a given allocator (HOST->VC) */
++struct vc_sm_free_all_t {
++ /* Allocator identifier */
++ u32 allocator;
++};
++
++/* Request to import memory (HOST->VC) */
++struct vc_sm_import {
++ /* type of memory to allocate */
++ enum vc_sm_alloc_type_t type;
++ /* pointer to the VC (ie physical) address of the allocated memory */
++ u32 addr;
++ /* size of buffer */
++ u32 size;
++ /* opaque handle returned in RELEASED messages */
++ u32 kernel_id;
++ /* Allocator identifier */
++ u32 allocator;
++ /* resource name (for easier tracking on vc side) */
++ char name[VC_SM_RESOURCE_NAME];
++};
++
++/* Result of a requested memory import (VC->HOST) */
++struct vc_sm_import_result {
++ /* Transaction identifier */
++ u32 trans_id;
++
++ /* Resource handle */
++ u32 res_handle;
++};
++
++/* Notification that VC has finished with an allocation (VC->HOST) */
++struct vc_sm_released {
++ /* cmd type / trans_id */
++ u32 cmd;
++
++ /* pointer to the VC (ie physical) address of the allocated memory */
++ u32 addr;
++ /* size of buffer */
++ u32 size;
++ /* opaque handle returned in RELEASED messages */
++ u32 kernel_id;
++ u32 vc_handle;
++};
++
++/*
++ * Client informing VC as to the protocol version it supports.
++ * >=2 requires the released callback, and supports VC asking for memory.
++ * Failure means that the firmware doesn't support this call, and therefore the
++ * client should either fail, or NOT rely on getting the released callback.
++ */
++struct vc_sm_version {
++ u32 version;
++};
++
++/* Request FROM VideoCore for some memory */
++struct vc_sm_vc_mem_request {
++ /* cmd type */
++ u32 cmd;
++
++ /* trans_id (from VPU) */
++ u32 trans_id;
++ /* size of buffer */
++ u32 size;
++ /* alignment of buffer */
++ u32 align;
++ /* resource name (for easier tracking) */
++ char name[VC_SM_RESOURCE_NAME];
++};
++
++/* Response from the kernel to provide the VPU with some memory */
++struct vc_sm_vc_mem_request_result {
++ /* Transaction identifier for the VPU */
++ u32 trans_id;
++ /* pointer to the physical address of the allocated memory */
++ u32 addr;
++ /* opaque handle returned in RELEASED messages */
++ u32 kernel_id;
++};
++
++/* Union of ALL messages */
++union vc_sm_msg_union_t {
++ struct vc_sm_alloc_t alloc;
++ struct vc_sm_alloc_result_t alloc_result;
++ struct vc_sm_free_t free;
++ struct vc_sm_lock_unlock_t lock_unlock;
++ struct vc_sm_action_clean_t action_clean;
++ struct vc_sm_resize_t resize;
++ struct vc_sm_lock_result_t lock_result;
++ struct vc_sm_result_t result;
++ struct vc_sm_free_all_t free_all;
++ struct vc_sm_import import;
++ struct vc_sm_import_result import_result;
++ struct vc_sm_version version;
++ struct vc_sm_released released;
++ struct vc_sm_vc_mem_request vc_request;
++ struct vc_sm_vc_mem_request_result vc_request_result;
++};
++
++#endif /* __VC_SM_DEFS_H__INCLUDED__ */
+--- /dev/null
++++ b/drivers/staging/vc04_services/vc-sm-cma/vc_sm_knl.h
+@@ -0,0 +1,28 @@
++/* SPDX-License-Identifier: GPL-2.0 */
++
++/*
++ * VideoCore Shared Memory CMA allocator
++ *
++ * Copyright: 2018, Raspberry Pi (Trading) Ltd
++ *
++ * Based on vc_sm_defs.h from the vmcs_sm driver Copyright Broadcom Corporation.
++ *
++ */
++
++#ifndef __VC_SM_KNL_H__INCLUDED__
++#define __VC_SM_KNL_H__INCLUDED__
++
++#if !defined(__KERNEL__)
++#error "This interface is for kernel use only..."
++#endif
++
++/* Free a previously allocated or imported shared memory handle and block. */
++int vc_sm_cma_free(int handle);
++
++/* Get an internal resource handle mapped from the external one. */
++int vc_sm_cma_int_handle(int handle);
++
++/* Import a block of memory into the GPU space. */
++int vc_sm_cma_import_dmabuf(struct dma_buf *dmabuf, int *handle);
++
++#endif /* __VC_SM_KNL_H__INCLUDED__ */
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