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950-0046-vcsm-VideoCore-shared-memory-service-for-BCM2835.patch
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/
950-0046-vcsm-VideoCore-shared-memory-service-for-BCM2835.patch
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From 6f27d1904c3f46e00388b1603ceed359387349d2 Mon Sep 17 00:00:00 2001
From: Tim Gover <tgover@broadcom.com>
Date: Tue, 22 Jul 2014 15:41:04 +0100
Subject: [PATCH] vcsm: VideoCore shared memory service for BCM2835
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Add experimental support for the VideoCore shared memory service.
This allows user processes to allocate memory from VideoCore's
GPU relocatable heap and mmap the buffers. Additionally, the memory
handles can passed to other VideoCore services such as MMAL, OpenMax
and DispmanX
TODO
* This driver was originally released for BCM28155 which has a different
cache architecture to BCM2835. Consequently, in this release only
uncached mappings are supported. However, there's no fundamental
reason which cached mappings cannot be support or BCM2835
* More refactoring is required to remove the typedefs.
* Re-enable the some of the commented out debug-fs statistics which were
disabled when migrating code from proc-fs.
* There's a lot of code to support sharing of VCSM in order to support
Android. This could probably done more cleanly or perhaps just
removed.
Signed-off-by: Tim Gover <timgover@gmail.com>
config: Disable VC_SM for now to fix hang with cutdown kernel
vcsm: Use boolean as it cannot be built as module
On building the bcm_vc_sm as a module we get the following error:
v7_dma_flush_range and do_munmap are undefined in vc-sm.ko.
Fix by making it not an option to build as module
vcsm: Add ioctl for custom cache flushing
vc-sm: Move headers out of arch directory
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
vcsm: Treat EBUSY as success rather than SIGBUS
Currently if two cores access the same page concurrently one will return VM_FAULT_NOPAGE
and the other VM_FAULT_SIGBUS crashing the user code.
Also report when mapping fails.
Signed-off-by: popcornmix <popcornmix@gmail.com>
vcsm: Provide new ioctl to clean/invalidate a 2D block
vcsm: Convert to loading via device tree.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
VCSM: New option to import a DMABUF for VPU use
Takes a dmabuf, and then calls over to the VPU to wrap
it into a suitable handle.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
vcsm: fix multi-platform build
vcsm: add macros for cache functions
vcsm: use dma APIs for cache functions
* Will handle multi-platform builds
vcsm: Fix up macros to avoid breaking numbers used by existing apps
vcsm: Define cache operation constants in user header
Without this change, users have to use raw values (1, 2, 3) to specify
cache operation.
Signed-off-by: Sugizaki Yukimasa <i.can.speak.c.and.basic@gmail.com>
vcsm: Support for finding user/vc handle in memory pool
vmcs_sm_{usr,vc}_handle_from_pid_and_address() were failing to find
handle if specified user pointer is not exactly the one that the memory
locking call returned even if the pointer is in range of map/resource.
So fixed the functions to match the range.
Signed-off-by: Sugizaki Yukimasa <i.can.speak.c.and.basic@gmail.com>
vcsm: Unify cache manipulating functions
Signed-off-by: Sugizaki Yukimasa <i.can.speak.c.and.basic@gmail.com>
vcsm: Fix obscure conditions
Signed-off-by: Sugizaki Yukimasa <i.can.speak.c.and.basic@gmail.com>
vcsm: Fix memory leaking on clean_invalid2 ioctl handler
Signed-off-by: Sugizaki Yukimasa <i.can.speak.c.and.basic@gmail.com>
vcsm: Describe the use of cache operation constants
Signed-off-by: Sugizaki Yukimasa <i.can.speak.c.and.basic@gmail.com>
vcsm: Fix obscure conditions again
Signed-off-by: Sugizaki Yukimasa <i.can.speak.c.and.basic@gmail.com>
vcsm: Add no-op cache operation constant
Signed-off-by: Sugizaki Yukimasa <i.can.speak.c.and.basic@gmail.com>
vcsm: Revert to do page-table-walk-based cache manipulating on some ioctl calls
On FLUSH, INVALID, CLEAN_INVALID ioctl calls, cache operations based on
page table walk were used in case that the buffer of the cache is not
pinned. So reverted to do page-table-based cache manipulating.
Signed-off-by: Sugizaki Yukimasa <i.can.speak.c.and.basic@gmail.com>
vcsm: Define cache operation constants in user header
Without this change, users have to use raw values (1, 2, 3) to specify
cache operation.
Signed-off-by: Sugizaki Yukimasa <i.can.speak.c.and.basic@gmail.com>
---
drivers/char/Kconfig | 2 +
drivers/char/Makefile | 1 +
drivers/char/broadcom/Kconfig | 10 +
drivers/char/broadcom/Makefile | 1 +
drivers/char/broadcom/vc_sm/Makefile | 9 +
drivers/char/broadcom/vc_sm/vc_sm_defs.h | 237 ++
drivers/char/broadcom/vc_sm/vc_sm_knl.h | 53 +
drivers/char/broadcom/vc_sm/vc_vchi_sm.c | 516 ++++
drivers/char/broadcom/vc_sm/vc_vchi_sm.h | 102 +
drivers/char/broadcom/vc_sm/vmcs_sm.c | 3543 ++++++++++++++++++++++
include/linux/broadcom/vmcs_sm_ioctl.h | 294 ++
11 files changed, 4768 insertions(+)
create mode 100644 drivers/char/broadcom/vc_sm/Makefile
create mode 100644 drivers/char/broadcom/vc_sm/vc_sm_defs.h
create mode 100644 drivers/char/broadcom/vc_sm/vc_sm_knl.h
create mode 100644 drivers/char/broadcom/vc_sm/vc_vchi_sm.c
create mode 100644 drivers/char/broadcom/vc_sm/vc_vchi_sm.h
create mode 100644 drivers/char/broadcom/vc_sm/vmcs_sm.c
create mode 100644 include/linux/broadcom/vmcs_sm_ioctl.h
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -5,6 +5,8 @@
menu "Character devices"
+source "drivers/char/broadcom/Kconfig"
+
source "drivers/tty/Kconfig"
config DEVMEM
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -58,3 +58,4 @@ js-rtc-y = rtc.o
obj-$(CONFIG_XILLYBUS) += xillybus/
obj-$(CONFIG_POWERNV_OP_PANEL) += powernv-op-panel.o
obj-$(CONFIG_ADI) += adi.o
+obj-$(CONFIG_BRCM_CHAR_DRIVERS) += broadcom/
--- a/drivers/char/broadcom/Kconfig
+++ b/drivers/char/broadcom/Kconfig
@@ -16,3 +16,13 @@ config BCM2708_VCMEM
Helper for videocore memory access and total size allocation.
endif
+
+config BCM_VC_SM
+ bool "VMCS Shared Memory"
+ depends on BCM2835_VCHIQ
+ select BCM2708_VCMEM
+ select DMA_SHARED_BUFFER
+ default n
+ help
+ Support for the VC shared memory on the Broadcom reference
+ design. Uses the VCHIQ stack.
--- a/drivers/char/broadcom/Makefile
+++ b/drivers/char/broadcom/Makefile
@@ -1 +1,2 @@
obj-$(CONFIG_BCM2708_VCMEM) += vc_mem.o
+obj-$(CONFIG_BCM_VC_SM) += vc_sm/
--- /dev/null
+++ b/drivers/char/broadcom/vc_sm/Makefile
@@ -0,0 +1,9 @@
+ccflags-$(CONFIG_BCM_VC_SM) += -Werror -Wall -Wstrict-prototypes -Wno-trigraphs -O2
+ccflags-$(CONFIG_BCM_VC_SM) += -I"drivers/staging/vc04_services" -I"drivers/staging/vc04_services/interface/vchi" -I"drivers/staging/vc04_services/interface/vchiq_arm" -I"$(srctree)/fs/"
+ccflags-$(CONFIG_BCM_VC_SM) += -DOS_ASSERT_FAILURE -D__STDC_VERSION=199901L -D__STDC_VERSION__=199901L -D__VCCOREVER__=0 -D__KERNEL__ -D__linux__
+
+obj-$(CONFIG_BCM_VC_SM) := vc-sm.o
+
+vc-sm-objs := \
+ vmcs_sm.o \
+ vc_vchi_sm.o
--- /dev/null
+++ b/drivers/char/broadcom/vc_sm/vc_sm_defs.h
@@ -0,0 +1,237 @@
+/*
+ ****************************************************************************
+ * Copyright 2011 Broadcom Corporation. All rights reserved.
+ *
+ * Unless you and Broadcom execute a separate written software license
+ * agreement governing use of this software, this software is licensed to you
+ * under the terms of the GNU General Public License version 2, available at
+ * http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+ *
+ * Notwithstanding the above, under no circumstances may you combine this
+ * software in any way with any other Broadcom software provided under a
+ * license other than the GPL, without Broadcom's express prior written
+ * consent.
+ ****************************************************************************
+ */
+
+#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
+
+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,
+
+ /* Message types supported for VC->HOST direction */
+
+ /*
+ * VC has finished with an imported memory allocation.
+ * Release any Linux reference counts on the underlying block.
+ */
+ VC_SM_MSG_TYPE_RELEASED,
+
+ 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 {
+ int32_t type;
+ uint32_t trans_id;
+ uint8_t 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 */
+ uint32_t base_unit;
+ /* number of unit to allocate */
+ uint32_t num_unit;
+ /* alignement to be applied on allocation */
+ uint32_t alignement;
+ /* identity of who allocated this block */
+ uint32_t 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 */
+ uint32_t trans_id;
+
+ /* Resource handle */
+ uint32_t res_handle;
+ /* Pointer to resource buffer */
+ uint32_t res_mem;
+ /* Resource base size (bytes) */
+ uint32_t res_base_size;
+ /* Resource number */
+ uint32_t res_num;
+
+};
+
+/* Request to free a previously allocated memory (HOST->VC) */
+struct vc_sm_free_t {
+ /* Resource handle (returned from alloc) */
+ uint32_t res_handle;
+ /* Resource buffer (returned from alloc) */
+ uint32_t res_mem;
+
+};
+
+/* Request to lock a previously allocated memory (HOST->VC) */
+struct vc_sm_lock_unlock_t {
+ /* Resource handle (returned from alloc) */
+ uint32_t res_handle;
+ /* Resource buffer (returned from alloc) */
+ uint32_t res_mem;
+
+};
+
+/* Request to resize a previously allocated memory (HOST->VC) */
+struct vc_sm_resize_t {
+ /* Resource handle (returned from alloc) */
+ uint32_t res_handle;
+ /* Resource buffer (returned from alloc) */
+ uint32_t res_mem;
+ /* Resource *new* size requested (bytes) */
+ uint32_t res_new_size;
+
+};
+
+/* Result of a requested memory lock (VC->HOST) */
+struct vc_sm_lock_result_t {
+ /* Transaction identifier */
+ uint32_t trans_id;
+
+ /* Resource handle */
+ uint32_t res_handle;
+ /* Pointer to resource buffer */
+ uint32_t res_mem;
+ /*
+ * Pointer to former resource buffer if the memory
+ * was reallocated
+ */
+ uint32_t res_old_mem;
+
+};
+
+/* Generic result for a request (VC->HOST) */
+struct vc_sm_result_t {
+ /* Transaction identifier */
+ uint32_t trans_id;
+
+ int32_t 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 */
+ uint32_t action_trans_id;
+
+};
+
+/* Request to remove all data associated with a given allocator (HOST->VC) */
+struct vc_sm_free_all_t {
+ /* Allocator identifier */
+ uint32_t 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 */
+ uint32_t addr;
+ /* size of buffer */
+ uint32_t size;
+ /* opaque handle returned in RELEASED messages */
+ int32_t kernel_id;
+ /* Allocator identifier */
+ uint32_t 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 */
+ uint32_t trans_id;
+
+ /* Resource handle */
+ uint32_t res_handle;
+};
+
+/* Notification that VC has finished with an allocation (VC->HOST) */
+struct vc_sm_released {
+ /* pointer to the VC (ie physical) address of the allocated memory */
+ uint32_t addr;
+ /* size of buffer */
+ uint32_t size;
+ /* opaque handle returned in RELEASED messages */
+ int32_t 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_released released;
+};
+
+#endif /* __VC_SM_DEFS_H__INCLUDED__ */
--- /dev/null
+++ b/drivers/char/broadcom/vc_sm/vc_sm_knl.h
@@ -0,0 +1,53 @@
+/*
+ ****************************************************************************
+ * Copyright 2011 Broadcom Corporation. All rights reserved.
+ *
+ * Unless you and Broadcom execute a separate written software license
+ * agreement governing use of this software, this software is licensed to you
+ * under the terms of the GNU General Public License version 2, available at
+ * http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+ *
+ * Notwithstanding the above, under no circumstances may you combine this
+ * software in any way with any other Broadcom software provided under a
+ * license other than the GPL, without Broadcom's express prior written
+ * consent.
+ ****************************************************************************
+ */
+
+#ifndef __VC_SM_KNL_H__INCLUDED__
+#define __VC_SM_KNL_H__INCLUDED__
+
+#if !defined(__KERNEL__)
+#error "This interface is for kernel use only..."
+#endif
+
+/* Type of memory to be locked (ie mapped) */
+enum vc_sm_lock_cache_mode {
+ VC_SM_LOCK_CACHED,
+ VC_SM_LOCK_NON_CACHED,
+};
+
+/* Allocate a shared memory handle and block. */
+int vc_sm_alloc(struct vc_sm_alloc_t *alloc, int *handle);
+
+/* Free a previously allocated shared memory handle and block. */
+int vc_sm_free(int handle);
+
+/* Lock a memory handle for use by kernel. */
+int vc_sm_lock(int handle, enum vc_sm_lock_cache_mode mode,
+ unsigned long *data);
+
+/* Unlock a memory handle in use by kernel. */
+int vc_sm_unlock(int handle, int flush, int no_vc_unlock);
+
+/* Get an internal resource handle mapped from the external one. */
+int vc_sm_int_handle(int handle);
+
+/* Map a shared memory region for use by kernel. */
+int vc_sm_map(int handle, unsigned int sm_addr,
+ enum vc_sm_lock_cache_mode mode, unsigned long *data);
+
+/* Import a block of memory into the GPU space. */
+int vc_sm_import_dmabuf(struct dma_buf *dmabuf, int *handle);
+
+#endif /* __VC_SM_KNL_H__INCLUDED__ */
--- /dev/null
+++ b/drivers/char/broadcom/vc_sm/vc_vchi_sm.c
@@ -0,0 +1,516 @@
+/*
+ ****************************************************************************
+ * Copyright 2011-2012 Broadcom Corporation. All rights reserved.
+ *
+ * Unless you and Broadcom execute a separate written software license
+ * agreement governing use of this software, this software is licensed to you
+ * under the terms of the GNU General Public License version 2, available at
+ * http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+ *
+ * Notwithstanding the above, under no circumstances may you combine this
+ * software in any way with any other Broadcom software provided under a
+ * license other than the GPL, without Broadcom's express prior written
+ * consent.
+ ****************************************************************************
+ */
+
+/* ---- Include Files ----------------------------------------------------- */
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/semaphore.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/kthread.h>
+
+#include "vc_vchi_sm.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 */
+ struct semaphore sema; /* To be signaled when the response is there */
+
+ uint16_t id;
+ uint16_t length;
+
+ uint8_t msg[VC_SM_MAX_MSG_LEN];
+
+ uint32_t wait:1;
+ uint32_t sent:1;
+ uint32_t alloc:1;
+
+};
+
+struct sm_instance {
+ uint32_t num_connections;
+ VCHI_SERVICE_HANDLE_T vchi_handle[VCHI_MAX_NUM_CONNECTIONS];
+ struct task_struct *io_thread;
+ struct semaphore io_sema;
+
+ uint32_t trans_id;
+
+ struct mutex lock;
+ 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];
+ struct list_head free_list;
+ struct mutex free_lock;
+ 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,
+ uint32_t 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;
+ sema_init(&blk->sema, 0);
+ } 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);
+ hdr->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 int vc_vchi_sm_videocore_io(void *arg)
+{
+ struct sm_instance *instance = arg;
+ struct sm_cmd_rsp_blk *cmd = NULL, *cmd_tmp;
+ struct vc_sm_result_t *reply;
+ uint32_t reply_len;
+ int32_t status;
+ int svc_use = 1;
+
+ while (1) {
+ if (svc_use)
+ vchi_service_release(instance->vchi_handle[0]);
+ svc_use = 0;
+ if (!down_interruptible(&instance->io_sema)) {
+ 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) {
+ up(&cmd->sema);
+ continue;
+ }
+
+ } while (1);
+
+ while (!vchi_msg_peek
+ (instance->vchi_handle[0], (void **)&reply,
+ &reply_len, VCHI_FLAGS_NONE)) {
+ 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...",
+ __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);
+ up(&cmd->sema);
+ }
+
+ 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_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:
+ up(&instance->io_sema);
+ break;
+
+ case VCHI_CALLBACK_SERVICE_CLOSED:
+ pr_info("%s: service CLOSED!!", __func__);
+ default:
+ break;
+ }
+}
+
+struct sm_instance *vc_vchi_sm_init(VCHI_INSTANCE_T vchi_instance,
+ VCHI_CONNECTION_T **vchi_connections,
+ uint32_t num_connections)
+{
+ uint32_t 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);
+ sema_init(&instance->io_sema, 0);
+ 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++) {
+ sema_init(&instance->free_blk[i].sema, 0);
+ 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 = {
+ VCHI_VERSION_EX(VC_SM_VER, VC_SM_MIN_VER),
+ VC_SM_SERVER_NAME,
+ vchi_connections[i],
+ 0,
+ 0,
+ vc_sm_vchi_callback,
+ instance,
+ 0,
+ 0,
+ 0,
+ };
+
+ status = vchi_service_open(vchi_instance,
+ ¶ms, &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_vchi_sm_videocore_io,
+ (void *)instance, "SMIO");
+ if (instance->io_thread == NULL) {
+ pr_err("%s: failed to create SMIO thread", __func__);
+
+ goto err_close_services;
+ }
+ 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] != NULL)
+ vchi_service_close(instance->vchi_handle[i]);
+ }
+ kfree(instance);
+err_null:
+ pr_debug("%s: FAILED", __func__);
+ return NULL;
+}
+
+int vc_vchi_sm_stop(struct sm_instance **handle)
+{
+ struct sm_instance *instance;
+ uint32_t i;
+
+ if (handle == NULL) {
+ pr_err("%s: invalid pointer to handle %p", __func__, handle);
+ goto lock;
+ }
+
+ if (*handle == NULL) {
+ 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++) {
+ int32_t 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;
+}
+
+int vc_vchi_sm_send_msg(struct sm_instance *handle,
+ enum vc_sm_msg_type msg_id,
+ void *msg, uint32_t msg_size,
+ void *result, uint32_t result_size,
+ uint32_t *cur_trans_id, uint8_t wait_reply)
+{
+ int status = 0;
+ struct sm_instance *instance = handle;
+ struct sm_cmd_rsp_blk *cmd_blk;
+
+ if (handle == NULL) {
+ pr_err("%s: invalid handle", __func__);
+ return -EINVAL;
+ }
+ if (msg == NULL) {
+ 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 == NULL) {
+ pr_err("[%s]: failed to allocate global tracking resource",
+ __func__);
+ return -ENOMEM;
+ }
+
+ if (cur_trans_id != NULL)
+ *cur_trans_id = cmd_blk->id;
+
+ mutex_lock(&instance->lock);
+ list_add_tail(&cmd_blk->head, &instance->cmd_list);
+ mutex_unlock(&instance->lock);
+ up(&instance->io_sema);
+
+ if (!wait_reply)
+ /* We're done */
+ return 0;
+
+ /* Wait for the response */
+ if (down_interruptible(&cmd_blk->sema)) {
+ 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;
+ }
+ mutex_unlock(&instance->lock);
+
+ mutex_lock(&instance->lock);
+ list_move(&cmd_blk->head, &instance->dead_list);
+ mutex_unlock(&instance->lock);
+ up(&instance->io_sema);
+ 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_vchi_sm_alloc(struct sm_instance *handle, struct vc_sm_alloc_t *msg,
+ struct vc_sm_alloc_result_t *result,
+ uint32_t *cur_trans_id)
+{
+ return vc_vchi_sm_send_msg(handle, VC_SM_MSG_TYPE_ALLOC,
+ msg, sizeof(*msg), result, sizeof(*result),
+ cur_trans_id, 1);
+}
+
+int vc_vchi_sm_free(struct sm_instance *handle,
+ struct vc_sm_free_t *msg, uint32_t *cur_trans_id)
+{
+ return vc_vchi_sm_send_msg(handle, VC_SM_MSG_TYPE_FREE,
+ msg, sizeof(*msg), 0, 0, cur_trans_id, 0);
+}
+
+int vc_vchi_sm_lock(struct sm_instance *handle,
+ struct vc_sm_lock_unlock_t *msg,
+ struct vc_sm_lock_result_t *result,
+ uint32_t *cur_trans_id)
+{
+ return vc_vchi_sm_send_msg(handle, VC_SM_MSG_TYPE_LOCK,
+ msg, sizeof(*msg), result, sizeof(*result),
+ cur_trans_id, 1);
+}
+
+int vc_vchi_sm_unlock(struct sm_instance *handle,
+ struct vc_sm_lock_unlock_t *msg,
+ uint32_t *cur_trans_id, uint8_t wait_reply)
+{
+ return vc_vchi_sm_send_msg(handle, wait_reply ?
+ VC_SM_MSG_TYPE_UNLOCK :
+ VC_SM_MSG_TYPE_UNLOCK_NOANS, msg,
+ sizeof(*msg), 0, 0, cur_trans_id,
+ wait_reply);
+}
+
+int vc_vchi_sm_resize(struct sm_instance *handle, struct vc_sm_resize_t *msg,
+ uint32_t *cur_trans_id)
+{
+ return vc_vchi_sm_send_msg(handle, VC_SM_MSG_TYPE_RESIZE,
+ msg, sizeof(*msg), 0, 0, cur_trans_id, 1);
+}
+
+int vc_vchi_sm_walk_alloc(struct sm_instance *handle)
+{
+ return vc_vchi_sm_send_msg(handle, VC_SM_MSG_TYPE_WALK_ALLOC,
+ 0, 0, 0, 0, 0, 0);