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From 4d96064d4c95d73d22563cea403eccd72e7b0da0 Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Wed, 3 Jul 2013 00:31:47 +0100
Subject: [PATCH] cma: Add vc_cma driver to enable use of CMA
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Signed-off-by: popcornmix <popcornmix@gmail.com>
vc_cma: Make the vc_cma area the default contiguous DMA area
vc_cma: Provide empty functions when module is not built
Providing empty functions saves the users from guarding the
function call with an #if clause.
Move __init markings from prototypes to functions.
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
drivers/char/Kconfig | 2 +
drivers/char/Makefile | 1 +
drivers/char/broadcom/Kconfig | 15 +
drivers/char/broadcom/Makefile | 1 +
drivers/char/broadcom/vc_cma/Makefile | 7 +
drivers/char/broadcom/vc_cma/vc_cma.c | 1193 +++++++++++++++++++++++++++++++++
include/linux/broadcom/vc_cma.h | 36 +
7 files changed, 1255 insertions(+)
create mode 100644 drivers/char/broadcom/Kconfig
create mode 100644 drivers/char/broadcom/Makefile
create mode 100644 drivers/char/broadcom/vc_cma/Makefile
create mode 100644 drivers/char/broadcom/vc_cma/vc_cma.c
create mode 100644 include/linux/broadcom/vc_cma.h
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -4,6 +4,8 @@
menu "Character devices"
+source "drivers/char/broadcom/Kconfig"
+
source "drivers/tty/Kconfig"
config DEVMEM
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -60,3 +60,4 @@ js-rtc-y = rtc.o
obj-$(CONFIG_TILE_SROM) += tile-srom.o
obj-$(CONFIG_XILLYBUS) += xillybus/
obj-$(CONFIG_POWERNV_OP_PANEL) += powernv-op-panel.o
+obj-$(CONFIG_BRCM_CHAR_DRIVERS) += broadcom/
--- /dev/null
+++ b/drivers/char/broadcom/Kconfig
@@ -0,0 +1,15 @@
+#
+# Broadcom char driver config
+#
+
+menuconfig BRCM_CHAR_DRIVERS
+ bool "Broadcom Char Drivers"
+ help
+ Broadcom's char drivers
+
+config BCM_VC_CMA
+ bool "Videocore CMA"
+ depends on CMA && BRCM_CHAR_DRIVERS && BCM2708_VCHIQ
+ default n
+ help
+ Helper for videocore CMA access.
--- /dev/null
+++ b/drivers/char/broadcom/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_BCM_VC_CMA) += vc_cma/
--- /dev/null
+++ b/drivers/char/broadcom/vc_cma/Makefile
@@ -0,0 +1,7 @@
+ccflags-$(CONFIG_BCM_VC_CMA) += -Wall -Wstrict-prototypes -Wno-trigraphs -Werror
+ccflags-$(CONFIG_BCM_VC_CMA) += -Iinclude/linux/broadcom -Idrivers/staging/vc04_services -Idrivers/staging/vc04_services/interface/vchi -Idrivers/staging/vc04_services/interface/vchiq_arm
+ccflags-$(CONFIG_BCM_VC_CMA) += -D__KERNEL__ -D__linux__
+
+obj-$(CONFIG_BCM_VC_CMA) += vc-cma.o
+
+vc-cma-objs := vc_cma.o
--- /dev/null
+++ b/drivers/char/broadcom/vc_cma/vc_cma.c
@@ -0,0 +1,1193 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ * to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/kthread.h>
+#include <linux/fs.h>
+#include <linux/device.h>
+#include <linux/cdev.h>
+#include <linux/mm.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/dma-mapping.h>
+#include <linux/dma-contiguous.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.h>
+#include <asm/cacheflush.h>
+
+#include "vc_cma.h"
+
+#include "vchiq_util.h"
+#include "vchiq_connected.h"
+//#include "debug_sym.h"
+//#include "vc_mem.h"
+
+#define DRIVER_NAME "vc-cma"
+
+#define LOG_DBG(fmt, ...) \
+ if (vc_cma_debug) \
+ printk(KERN_INFO fmt "\n", ##__VA_ARGS__)
+#define LOG_INFO(fmt, ...) \
+ printk(KERN_INFO fmt "\n", ##__VA_ARGS__)
+#define LOG_ERR(fmt, ...) \
+ printk(KERN_ERR fmt "\n", ##__VA_ARGS__)
+
+#define VC_CMA_FOURCC VCHIQ_MAKE_FOURCC('C', 'M', 'A', ' ')
+#define VC_CMA_VERSION 2
+
+#define VC_CMA_CHUNK_ORDER 6 /* 256K */
+#define VC_CMA_CHUNK_SIZE (4096 << VC_CMA_CHUNK_ORDER)
+#define VC_CMA_MAX_PARAMS_PER_MSG \
+ ((VCHIQ_MAX_MSG_SIZE - sizeof(unsigned short))/sizeof(unsigned short))
+#define VC_CMA_RESERVE_COUNT_MAX 16
+
+#define PAGES_PER_CHUNK (VC_CMA_CHUNK_SIZE / PAGE_SIZE)
+
+#define VCADDR_TO_PHYSADDR(vcaddr) (mm_vc_mem_phys_addr + vcaddr)
+
+#define loud_error(...) \
+ LOG_ERR("===== " __VA_ARGS__)
+
+enum {
+ VC_CMA_MSG_QUIT,
+ VC_CMA_MSG_OPEN,
+ VC_CMA_MSG_TICK,
+ VC_CMA_MSG_ALLOC, /* chunk count */
+ VC_CMA_MSG_FREE, /* chunk, chunk, ... */
+ VC_CMA_MSG_ALLOCATED, /* chunk, chunk, ... */
+ VC_CMA_MSG_REQUEST_ALLOC, /* chunk count */
+ VC_CMA_MSG_REQUEST_FREE, /* chunk count */
+ VC_CMA_MSG_RESERVE, /* bytes lo, bytes hi */
+ VC_CMA_MSG_UPDATE_RESERVE,
+ VC_CMA_MSG_MAX
+};
+
+struct cma_msg {
+ unsigned short type;
+ unsigned short params[VC_CMA_MAX_PARAMS_PER_MSG];
+};
+
+struct vc_cma_reserve_user {
+ unsigned int pid;
+ unsigned int reserve;
+};
+
+/* Device (/dev) related variables */
+static dev_t vc_cma_devnum;
+static struct class *vc_cma_class;
+static struct cdev vc_cma_cdev;
+static int vc_cma_inited;
+static int vc_cma_debug;
+
+/* Proc entry */
+static struct proc_dir_entry *vc_cma_proc_entry;
+
+phys_addr_t vc_cma_base;
+struct page *vc_cma_base_page;
+unsigned int vc_cma_size;
+EXPORT_SYMBOL(vc_cma_size);
+unsigned int vc_cma_initial;
+unsigned int vc_cma_chunks;
+unsigned int vc_cma_chunks_used;
+unsigned int vc_cma_chunks_reserved;
+
+
+void *vc_cma_dma_alloc;
+unsigned int vc_cma_dma_size;
+
+static int in_loud_error;
+
+unsigned int vc_cma_reserve_total;
+unsigned int vc_cma_reserve_count;
+struct vc_cma_reserve_user vc_cma_reserve_users[VC_CMA_RESERVE_COUNT_MAX];
+static DEFINE_SEMAPHORE(vc_cma_reserve_mutex);
+static DEFINE_SEMAPHORE(vc_cma_worker_queue_push_mutex);
+
+static u64 vc_cma_dma_mask = DMA_BIT_MASK(32);
+static struct platform_device vc_cma_device = {
+ .name = "vc-cma",
+ .id = 0,
+ .dev = {
+ .dma_mask = &vc_cma_dma_mask,
+ .coherent_dma_mask = DMA_BIT_MASK(32),
+ },
+};
+
+static VCHIQ_INSTANCE_T cma_instance;
+static VCHIQ_SERVICE_HANDLE_T cma_service;
+static VCHIU_QUEUE_T cma_msg_queue;
+static struct task_struct *cma_worker;
+
+static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid);
+static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply);
+static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
+ VCHIQ_HEADER_T * header,
+ VCHIQ_SERVICE_HANDLE_T service,
+ void *bulk_userdata);
+static void send_vc_msg(unsigned short type,
+ unsigned short param1, unsigned short param2);
+static bool send_worker_msg(VCHIQ_HEADER_T * msg);
+
+static int early_vc_cma_mem(char *p)
+{
+ unsigned int new_size;
+ printk(KERN_NOTICE "early_vc_cma_mem(%s)", p);
+ vc_cma_size = memparse(p, &p);
+ vc_cma_initial = vc_cma_size;
+ if (*p == '/')
+ vc_cma_size = memparse(p + 1, &p);
+ if (*p == '@')
+ vc_cma_base = memparse(p + 1, &p);
+
+ new_size = (vc_cma_size - ((-vc_cma_base) & (VC_CMA_CHUNK_SIZE - 1)))
+ & ~(VC_CMA_CHUNK_SIZE - 1);
+ if (new_size > vc_cma_size)
+ vc_cma_size = 0;
+ vc_cma_initial = (vc_cma_initial + VC_CMA_CHUNK_SIZE - 1)
+ & ~(VC_CMA_CHUNK_SIZE - 1);
+ if (vc_cma_initial > vc_cma_size)
+ vc_cma_initial = vc_cma_size;
+ vc_cma_base = (vc_cma_base + VC_CMA_CHUNK_SIZE - 1)
+ & ~(VC_CMA_CHUNK_SIZE - 1);
+
+ printk(KERN_NOTICE " -> initial %x, size %x, base %x", vc_cma_initial,
+ vc_cma_size, (unsigned int)vc_cma_base);
+
+ return 0;
+}
+
+early_param("vc-cma-mem", early_vc_cma_mem);
+
+void __init vc_cma_early_init(void)
+{
+ LOG_DBG("vc_cma_early_init - vc_cma_chunks = %d", vc_cma_chunks);
+ if (vc_cma_size) {
+ int rc = platform_device_register(&vc_cma_device);
+ LOG_DBG("platform_device_register -> %d", rc);
+ }
+}
+
+void __init vc_cma_reserve(void)
+{
+ /* if vc_cma_size is set, then declare vc CMA area of the same
+ * size from the end of memory
+ */
+ if (vc_cma_size) {
+ if (dma_declare_contiguous(&vc_cma_device.dev, vc_cma_size,
+ vc_cma_base, 0) == 0) {
+ if (!dev_get_cma_area(NULL)) {
+ /* There is no default CMA area - make this
+ the default */
+ struct cma *vc_cma_area = dev_get_cma_area(
+ &vc_cma_device.dev);
+ dma_contiguous_set_default(vc_cma_area);
+ LOG_INFO("vc_cma_reserve - using vc_cma as "
+ "the default contiguous DMA area");
+ }
+ } else {
+ LOG_ERR("vc_cma: dma_declare_contiguous(%x,%x) failed",
+ vc_cma_size, (unsigned int)vc_cma_base);
+ vc_cma_size = 0;
+ }
+ }
+ vc_cma_chunks = vc_cma_size / VC_CMA_CHUNK_SIZE;
+}
+
+/****************************************************************************
+*
+* vc_cma_open
+*
+***************************************************************************/
+
+static int vc_cma_open(struct inode *inode, struct file *file)
+{
+ (void)inode;
+ (void)file;
+
+ return 0;
+}
+
+/****************************************************************************
+*
+* vc_cma_release
+*
+***************************************************************************/
+
+static int vc_cma_release(struct inode *inode, struct file *file)
+{
+ (void)inode;
+ (void)file;
+
+ vc_cma_set_reserve(0, current->tgid);
+
+ return 0;
+}
+
+/****************************************************************************
+*
+* vc_cma_ioctl
+*
+***************************************************************************/
+
+static long vc_cma_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ int rc = 0;
+
+ (void)cmd;
+ (void)arg;
+
+ switch (cmd) {
+ case VC_CMA_IOC_RESERVE:
+ rc = vc_cma_set_reserve((unsigned int)arg, current->tgid);
+ if (rc >= 0)
+ rc = 0;
+ break;
+ default:
+ LOG_ERR("vc-cma: Unknown ioctl %x", cmd);
+ return -ENOTTY;
+ }
+
+ return rc;
+}
+
+/****************************************************************************
+*
+* File Operations for the driver.
+*
+***************************************************************************/
+
+static const struct file_operations vc_cma_fops = {
+ .owner = THIS_MODULE,
+ .open = vc_cma_open,
+ .release = vc_cma_release,
+ .unlocked_ioctl = vc_cma_ioctl,
+};
+
+/****************************************************************************
+*
+* vc_cma_proc_open
+*
+***************************************************************************/
+
+static int vc_cma_show_info(struct seq_file *m, void *v)
+{
+ int i;
+
+ seq_printf(m, "Videocore CMA:\n");
+ seq_printf(m, " Base : %08x\n", (unsigned int)vc_cma_base);
+ seq_printf(m, " Length : %08x\n", vc_cma_size);
+ seq_printf(m, " Initial : %08x\n", vc_cma_initial);
+ seq_printf(m, " Chunk size : %08x\n", VC_CMA_CHUNK_SIZE);
+ seq_printf(m, " Chunks : %4d (%d bytes)\n",
+ (int)vc_cma_chunks,
+ (int)(vc_cma_chunks * VC_CMA_CHUNK_SIZE));
+ seq_printf(m, " Used : %4d (%d bytes)\n",
+ (int)vc_cma_chunks_used,
+ (int)(vc_cma_chunks_used * VC_CMA_CHUNK_SIZE));
+ seq_printf(m, " Reserved : %4d (%d bytes)\n",
+ (unsigned int)vc_cma_chunks_reserved,
+ (int)(vc_cma_chunks_reserved * VC_CMA_CHUNK_SIZE));
+
+ for (i = 0; i < vc_cma_reserve_count; i++) {
+ struct vc_cma_reserve_user *user = &vc_cma_reserve_users[i];
+ seq_printf(m, " PID %5d: %d bytes\n", user->pid,
+ user->reserve);
+ }
+ seq_printf(m, " dma_alloc : %p (%d pages)\n",
+ vc_cma_dma_alloc ? page_address(vc_cma_dma_alloc) : 0,
+ vc_cma_dma_size);
+
+ seq_printf(m, "\n");
+
+ return 0;
+}
+
+static int vc_cma_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, vc_cma_show_info, NULL);
+}
+
+/****************************************************************************
+*
+* vc_cma_proc_write
+*
+***************************************************************************/
+
+static int vc_cma_proc_write(struct file *file,
+ const char __user *buffer,
+ size_t size, loff_t *ppos)
+{
+ int rc = -EFAULT;
+ char input_str[20];
+
+ memset(input_str, 0, sizeof(input_str));
+
+ if (size > sizeof(input_str)) {
+ LOG_ERR("%s: input string length too long", __func__);
+ goto out;
+ }
+
+ if (copy_from_user(input_str, buffer, size - 1)) {
+ LOG_ERR("%s: failed to get input string", __func__);
+ goto out;
+ }
+#define ALLOC_STR "alloc"
+#define FREE_STR "free"
+#define DEBUG_STR "debug"
+#define RESERVE_STR "reserve"
+#define DMA_ALLOC_STR "dma_alloc"
+#define DMA_FREE_STR "dma_free"
+ if (strncmp(input_str, ALLOC_STR, strlen(ALLOC_STR)) == 0) {
+ int alloc_size;
+ char *p = input_str + strlen(ALLOC_STR);
+
+ while (*p == ' ')
+ p++;
+ alloc_size = memparse(p, NULL);
+ LOG_INFO("/proc/vc-cma: alloc %d", alloc_size);
+ if (alloc_size)
+ send_vc_msg(VC_CMA_MSG_REQUEST_FREE,
+ alloc_size / VC_CMA_CHUNK_SIZE, 0);
+ else
+ LOG_ERR("invalid size '%s'", p);
+ rc = size;
+ } else if (strncmp(input_str, FREE_STR, strlen(FREE_STR)) == 0) {
+ int alloc_size;
+ char *p = input_str + strlen(FREE_STR);
+
+ while (*p == ' ')
+ p++;
+ alloc_size = memparse(p, NULL);
+ LOG_INFO("/proc/vc-cma: free %d", alloc_size);
+ if (alloc_size)
+ send_vc_msg(VC_CMA_MSG_REQUEST_ALLOC,
+ alloc_size / VC_CMA_CHUNK_SIZE, 0);
+ else
+ LOG_ERR("invalid size '%s'", p);
+ rc = size;
+ } else if (strncmp(input_str, DEBUG_STR, strlen(DEBUG_STR)) == 0) {
+ char *p = input_str + strlen(DEBUG_STR);
+ while (*p == ' ')
+ p++;
+ if ((strcmp(p, "on") == 0) || (strcmp(p, "1") == 0))
+ vc_cma_debug = 1;
+ else if ((strcmp(p, "off") == 0) || (strcmp(p, "0") == 0))
+ vc_cma_debug = 0;
+ LOG_INFO("/proc/vc-cma: debug %s", vc_cma_debug ? "on" : "off");
+ rc = size;
+ } else if (strncmp(input_str, RESERVE_STR, strlen(RESERVE_STR)) == 0) {
+ int alloc_size;
+ int reserved;
+ char *p = input_str + strlen(RESERVE_STR);
+ while (*p == ' ')
+ p++;
+ alloc_size = memparse(p, NULL);
+
+ reserved = vc_cma_set_reserve(alloc_size, current->tgid);
+ rc = (reserved >= 0) ? size : reserved;
+ } else if (strncmp(input_str, DMA_ALLOC_STR, strlen(DMA_ALLOC_STR)) == 0) {
+ int alloc_size;
+ char *p = input_str + strlen(DMA_ALLOC_STR);
+ while (*p == ' ')
+ p++;
+ alloc_size = memparse(p, NULL);
+
+ if (vc_cma_dma_alloc) {
+ dma_release_from_contiguous(NULL, vc_cma_dma_alloc,
+ vc_cma_dma_size);
+ vc_cma_dma_alloc = NULL;
+ vc_cma_dma_size = 0;
+ }
+ vc_cma_dma_alloc = dma_alloc_from_contiguous(NULL, alloc_size, 0);
+ vc_cma_dma_size = (vc_cma_dma_alloc ? alloc_size : 0);
+ if (vc_cma_dma_alloc)
+ LOG_INFO("dma_alloc(%d pages) -> %p", alloc_size, page_address(vc_cma_dma_alloc));
+ else
+ LOG_ERR("dma_alloc(%d pages) failed", alloc_size);
+ rc = size;
+ } else if (strncmp(input_str, DMA_FREE_STR, strlen(DMA_FREE_STR)) == 0) {
+ if (vc_cma_dma_alloc) {
+ dma_release_from_contiguous(NULL, vc_cma_dma_alloc,
+ vc_cma_dma_size);
+ vc_cma_dma_alloc = NULL;
+ vc_cma_dma_size = 0;
+ }
+ rc = size;
+ }
+
+out:
+ return rc;
+}
+
+/****************************************************************************
+*
+* File Operations for /proc interface.
+*
+***************************************************************************/
+
+static const struct file_operations vc_cma_proc_fops = {
+ .open = vc_cma_proc_open,
+ .read = seq_read,
+ .write = vc_cma_proc_write,
+ .llseek = seq_lseek,
+ .release = single_release
+};
+
+static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid)
+{
+ struct vc_cma_reserve_user *user = NULL;
+ int delta = 0;
+ int i;
+
+ if (down_interruptible(&vc_cma_reserve_mutex))
+ return -ERESTARTSYS;
+
+ for (i = 0; i < vc_cma_reserve_count; i++) {
+ if (pid == vc_cma_reserve_users[i].pid) {
+ user = &vc_cma_reserve_users[i];
+ delta = reserve - user->reserve;
+ if (reserve)
+ user->reserve = reserve;
+ else {
+ /* Remove this entry by copying downwards */
+ while ((i + 1) < vc_cma_reserve_count) {
+ user[0].pid = user[1].pid;
+ user[0].reserve = user[1].reserve;
+ user++;
+ i++;
+ }
+ vc_cma_reserve_count--;
+ user = NULL;
+ }
+ break;
+ }
+ }
+
+ if (reserve && !user) {
+ if (vc_cma_reserve_count == VC_CMA_RESERVE_COUNT_MAX) {
+ LOG_ERR("vc-cma: Too many reservations - "
+ "increase CMA_RESERVE_COUNT_MAX");
+ up(&vc_cma_reserve_mutex);
+ return -EBUSY;
+ }
+ user = &vc_cma_reserve_users[vc_cma_reserve_count];
+ user->pid = pid;
+ user->reserve = reserve;
+ delta = reserve;
+ vc_cma_reserve_count++;
+ }
+
+ vc_cma_reserve_total += delta;
+
+ send_vc_msg(VC_CMA_MSG_RESERVE,
+ vc_cma_reserve_total & 0xffff, vc_cma_reserve_total >> 16);
+
+ send_worker_msg((VCHIQ_HEADER_T *) VC_CMA_MSG_UPDATE_RESERVE);
+
+ LOG_DBG("/proc/vc-cma: reserve %d (PID %d) - total %u",
+ reserve, pid, vc_cma_reserve_total);
+
+ up(&vc_cma_reserve_mutex);
+
+ return vc_cma_reserve_total;
+}
+
+static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
+ VCHIQ_HEADER_T * header,
+ VCHIQ_SERVICE_HANDLE_T service,
+ void *bulk_userdata)
+{
+ switch (reason) {
+ case VCHIQ_MESSAGE_AVAILABLE:
+ if (!send_worker_msg(header))
+ return VCHIQ_RETRY;
+ break;
+ case VCHIQ_SERVICE_CLOSED:
+ LOG_DBG("CMA service closed");
+ break;
+ default:
+ LOG_ERR("Unexpected CMA callback reason %d", reason);
+ break;
+ }
+ return VCHIQ_SUCCESS;
+}
+
+static void send_vc_msg(unsigned short type,
+ unsigned short param1, unsigned short param2)
+{
+ unsigned short msg[] = { type, param1, param2 };
+ VCHIQ_ELEMENT_T elem = { &msg, sizeof(msg) };
+ VCHIQ_STATUS_T ret;
+ vchiq_use_service(cma_service);
+ ret = vchiq_queue_message(cma_service, &elem, 1);
+ vchiq_release_service(cma_service);
+ if (ret != VCHIQ_SUCCESS)
+ LOG_ERR("vchiq_queue_message returned %x", ret);
+}
+
+static bool send_worker_msg(VCHIQ_HEADER_T * msg)
+{
+ if (down_interruptible(&vc_cma_worker_queue_push_mutex))
+ return false;
+ vchiu_queue_push(&cma_msg_queue, msg);
+ up(&vc_cma_worker_queue_push_mutex);
+ return true;
+}
+
+static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply)
+{
+ int i;
+ for (i = 0; i < num_chunks; i++) {
+ struct page *chunk;
+ unsigned int chunk_num;
+ uint8_t *chunk_addr;
+ size_t chunk_size = PAGES_PER_CHUNK << PAGE_SHIFT;
+
+ chunk = dma_alloc_from_contiguous(&vc_cma_device.dev,
+ PAGES_PER_CHUNK,
+ VC_CMA_CHUNK_ORDER);
+ if (!chunk)
+ break;
+
+ chunk_addr = page_address(chunk);
+ dmac_flush_range(chunk_addr, chunk_addr + chunk_size);
+ outer_inv_range(__pa(chunk_addr), __pa(chunk_addr) +
+ chunk_size);
+
+ chunk_num =
+ (page_to_phys(chunk) - vc_cma_base) / VC_CMA_CHUNK_SIZE;
+ BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
+ VC_CMA_CHUNK_SIZE) != 0);
+ if (chunk_num >= vc_cma_chunks) {
+ phys_addr_t _pa = vc_cma_base + vc_cma_size - 1;
+ LOG_ERR("%s: ===============================",
+ __func__);
+ LOG_ERR("%s: chunk phys %x, vc_cma %pa-%pa - "
+ "bad SPARSEMEM configuration?",
+ __func__, (unsigned int)page_to_phys(chunk),
+ &vc_cma_base, &_pa);
+ LOG_ERR("%s: dev->cma_area = %p", __func__,
+ (void*)0/*vc_cma_device.dev.cma_area*/);
+ LOG_ERR("%s: ===============================",
+ __func__);
+ break;
+ }
+ reply->params[i] = chunk_num;
+ vc_cma_chunks_used++;
+ }
+
+ if (i < num_chunks) {
+ LOG_ERR("%s: dma_alloc_from_contiguous failed "
+ "for %x bytes (alloc %d of %d, %d free)",
+ __func__, VC_CMA_CHUNK_SIZE, i,
+ num_chunks, vc_cma_chunks - vc_cma_chunks_used);
+ num_chunks = i;
+ }
+
+ LOG_DBG("CMA allocated %d chunks -> %d used",
+ num_chunks, vc_cma_chunks_used);
+ reply->type = VC_CMA_MSG_ALLOCATED;
+
+ {
+ VCHIQ_ELEMENT_T elem = {
+ reply,
+ offsetof(struct cma_msg, params[0]) +
+ num_chunks * sizeof(reply->params[0])
+ };
+ VCHIQ_STATUS_T ret;
+ vchiq_use_service(cma_service);
+ ret = vchiq_queue_message(cma_service, &elem, 1);
+ vchiq_release_service(cma_service);
+ if (ret != VCHIQ_SUCCESS)
+ LOG_ERR("vchiq_queue_message return " "%x", ret);
+ }
+
+ return num_chunks;
+}
+
+static int cma_worker_proc(void *param)
+{
+ static struct cma_msg reply;
+ (void)param;
+
+ while (1) {
+ VCHIQ_HEADER_T *msg;
+ static struct cma_msg msg_copy;
+ struct cma_msg *cma_msg = &msg_copy;
+ int type, msg_size;
+
+ msg = vchiu_queue_pop(&cma_msg_queue);
+ if ((unsigned int)msg >= VC_CMA_MSG_MAX) {
+ msg_size = msg->size;
+ memcpy(&msg_copy, msg->data, msg_size);
+ type = cma_msg->type;
+ vchiq_release_message(cma_service, msg);
+ } else {
+ msg_size = 0;
+ type = (int)msg;
+ if (type == VC_CMA_MSG_QUIT)
+ break;
+ else if (type == VC_CMA_MSG_UPDATE_RESERVE) {
+ msg = NULL;
+ cma_msg = NULL;
+ } else {
+ BUG();
+ continue;
+ }
+ }
+
+ switch (type) {
+ case VC_CMA_MSG_ALLOC:{
+ int num_chunks, free_chunks;
+ num_chunks = cma_msg->params[0];
+ free_chunks =
+ vc_cma_chunks - vc_cma_chunks_used;
+ LOG_DBG("CMA_MSG_ALLOC(%d chunks)", num_chunks);
+ if (num_chunks > VC_CMA_MAX_PARAMS_PER_MSG) {
+ LOG_ERR
+ ("CMA_MSG_ALLOC - chunk count (%d) "
+ "exceeds VC_CMA_MAX_PARAMS_PER_MSG (%d)",
+ num_chunks,
+ VC_CMA_MAX_PARAMS_PER_MSG);
+ num_chunks = VC_CMA_MAX_PARAMS_PER_MSG;
+ }
+
+ if (num_chunks > free_chunks) {
+ LOG_ERR
+ ("CMA_MSG_ALLOC - chunk count (%d) "
+ "exceeds free chunks (%d)",
+ num_chunks, free_chunks);
+ num_chunks = free_chunks;
+ }
+
+ vc_cma_alloc_chunks(num_chunks, &reply);
+ }
+ break;
+
+ case VC_CMA_MSG_FREE:{
+ int chunk_count =
+ (msg_size -
+ offsetof(struct cma_msg,
+ params)) /
+ sizeof(cma_msg->params[0]);
+ int i;
+ BUG_ON(chunk_count <= 0);
+
+ LOG_DBG("CMA_MSG_FREE(%d chunks - %x, ...)",
+ chunk_count, cma_msg->params[0]);
+ for (i = 0; i < chunk_count; i++) {
+ int chunk_num = cma_msg->params[i];
+ struct page *page = vc_cma_base_page +
+ chunk_num * PAGES_PER_CHUNK;
+ if (chunk_num >= vc_cma_chunks) {
+ LOG_ERR
+ ("CMA_MSG_FREE - chunk %d of %d"
+ " (value %x) exceeds maximum "
+ "(%x)", i, chunk_count,
+ chunk_num,
+ vc_cma_chunks - 1);
+ break;
+ }
+
+ if (!dma_release_from_contiguous
+ (&vc_cma_device.dev, page,
+ PAGES_PER_CHUNK)) {
+ phys_addr_t _pa = page_to_phys(page);
+ LOG_ERR
+ ("CMA_MSG_FREE - failed to "
+ "release chunk %d (phys %pa, "
+ "page %x)", chunk_num,
+ &_pa,
+ (unsigned int)page);
+ }
+ vc_cma_chunks_used--;
+ }
+ LOG_DBG("CMA released %d chunks -> %d used",
+ i, vc_cma_chunks_used);
+ }
+ break;
+
+ case VC_CMA_MSG_UPDATE_RESERVE:{
+ int chunks_needed =
+ ((vc_cma_reserve_total + VC_CMA_CHUNK_SIZE -
+ 1)
+ / VC_CMA_CHUNK_SIZE) -
+ vc_cma_chunks_reserved;
+
+ LOG_DBG
+ ("CMA_MSG_UPDATE_RESERVE(%d chunks needed)",
+ chunks_needed);
+
+ /* Cap the reservations to what is available */
+ if (chunks_needed > 0) {
+ if (chunks_needed >
+ (vc_cma_chunks -
+ vc_cma_chunks_used))
+ chunks_needed =
+ (vc_cma_chunks -
+ vc_cma_chunks_used);
+
+ chunks_needed =
+ vc_cma_alloc_chunks(chunks_needed,
+ &reply);
+ }
+
+ LOG_DBG
+ ("CMA_MSG_UPDATE_RESERVE(%d chunks allocated)",
+ chunks_needed);
+ vc_cma_chunks_reserved += chunks_needed;
+ }
+ break;
+
+ default:
+ LOG_ERR("unexpected msg type %d", type);
+ break;
+ }
+ }
+
+ LOG_DBG("quitting...");
+ return 0;
+}
+
+/****************************************************************************
+*
+* vc_cma_connected_init
+*
+* This function is called once the videocore has been connected.
+*
+***************************************************************************/
+
+static void vc_cma_connected_init(void)
+{
+ VCHIQ_SERVICE_PARAMS_T service_params;
+
+ LOG_DBG("vc_cma_connected_init");
+
+ if (!vchiu_queue_init(&cma_msg_queue, 16)) {
+ LOG_ERR("could not create CMA msg queue");
+ goto fail_queue;
+ }
+
+ if (vchiq_initialise(&cma_instance) != VCHIQ_SUCCESS)
+ goto fail_vchiq_init;
+
+ vchiq_connect(cma_instance);
+
+ service_params.fourcc = VC_CMA_FOURCC;
+ service_params.callback = cma_service_callback;
+ service_params.userdata = NULL;
+ service_params.version = VC_CMA_VERSION;
+ service_params.version_min = VC_CMA_VERSION;
+
+ if (vchiq_open_service(cma_instance, &service_params,
+ &cma_service) != VCHIQ_SUCCESS) {
+ LOG_ERR("failed to open service - already in use?");
+ goto fail_vchiq_open;
+ }
+
+ vchiq_release_service(cma_service);
+
+ cma_worker = kthread_create(cma_worker_proc, NULL, "cma_worker");
+ if (!cma_worker) {
+ LOG_ERR("could not create CMA worker thread");
+ goto fail_worker;
+ }
+ set_user_nice(cma_worker, -20);
+ wake_up_process(cma_worker);
+
+ return;
+
+fail_worker:
+ vchiq_close_service(cma_service);
+fail_vchiq_open:
+ vchiq_shutdown(cma_instance);
+fail_vchiq_init:
+ vchiu_queue_delete(&cma_msg_queue);
+fail_queue:
+ return;
+}
+
+void
+loud_error_header(void)
+{
+ if (in_loud_error)
+ return;
+
+ LOG_ERR("============================================================"
+ "================");
+ LOG_ERR("============================================================"
+ "================");
+ LOG_ERR("=====");
+
+ in_loud_error = 1;
+}
+
+void
+loud_error_footer(void)
+{
+ if (!in_loud_error)
+ return;
+
+ LOG_ERR("=====");
+ LOG_ERR("============================================================"
+ "================");
+ LOG_ERR("============================================================"
+ "================");
+
+ in_loud_error = 0;
+}
+
+#if 1
+static int check_cma_config(void) { return 1; }
+#else
+static int
+read_vc_debug_var(VC_MEM_ACCESS_HANDLE_T handle,
+ const char *symbol,
+ void *buf, size_t bufsize)
+{
+ VC_MEM_ADDR_T vcMemAddr;
+ size_t vcMemSize;
+ uint8_t *mapAddr;
+ off_t vcMapAddr;
+
+ if (!LookupVideoCoreSymbol(handle, symbol,
+ &vcMemAddr,
+ &vcMemSize)) {
+ loud_error_header();
+ loud_error(
+ "failed to find VC symbol \"%s\".",
+ symbol);
+ loud_error_footer();
+ return 0;
+ }
+
+ if (vcMemSize != bufsize) {
+ loud_error_header();
+ loud_error(
+ "VC symbol \"%s\" is the wrong size.",
+ symbol);
+ loud_error_footer();
+ return 0;
+ }
+
+ vcMapAddr = (off_t)vcMemAddr & VC_MEM_TO_ARM_ADDR_MASK;
+ vcMapAddr += mm_vc_mem_phys_addr;
+ mapAddr = ioremap_nocache(vcMapAddr, vcMemSize);
+ if (mapAddr == 0) {
+ loud_error_header();
+ loud_error(
+ "failed to ioremap \"%s\" @ 0x%x "
+ "(phys: 0x%x, size: %u).",
+ symbol,
+ (unsigned int)vcMapAddr,
+ (unsigned int)vcMemAddr,
+ (unsigned int)vcMemSize);
+ loud_error_footer();
+ return 0;
+ }
+
+ memcpy(buf, mapAddr, bufsize);
+ iounmap(mapAddr);
+
+ return 1;
+}
+
+
+static int
+check_cma_config(void)
+{
+ VC_MEM_ACCESS_HANDLE_T mem_hndl;
+ VC_MEM_ADDR_T mempool_start;
+ VC_MEM_ADDR_T mempool_end;
+ VC_MEM_ADDR_T mempool_offline_start;
+ VC_MEM_ADDR_T mempool_offline_end;
+ VC_MEM_ADDR_T cam_alloc_base;
+ VC_MEM_ADDR_T cam_alloc_size;
+ VC_MEM_ADDR_T cam_alloc_end;
+ int success = 0;
+
+ if (OpenVideoCoreMemory(&mem_hndl) != 0)
+ goto out;
+
+ /* Read the relevant VideoCore variables */
+ if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_START",
+ &mempool_start,
+ sizeof(mempool_start)))
+ goto close;
+
+ if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_END",
+ &mempool_end,
+ sizeof(mempool_end)))
+ goto close;
+
+ if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_START",
+ &mempool_offline_start,
+ sizeof(mempool_offline_start)))
+ goto close;
+
+ if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_END",
+ &mempool_offline_end,
+ sizeof(mempool_offline_end)))
+ goto close;
+
+ if (!read_vc_debug_var(mem_hndl, "cam_alloc_base",
+ &cam_alloc_base,
+ sizeof(cam_alloc_base)))
+ goto close;
+
+ if (!read_vc_debug_var(mem_hndl, "cam_alloc_size",
+ &cam_alloc_size,
+ sizeof(cam_alloc_size)))
+ goto close;
+
+ cam_alloc_end = cam_alloc_base + cam_alloc_size;
+
+ success = 1;
+
+ /* Now the sanity checks */
+ if (!mempool_offline_start)
+ mempool_offline_start = mempool_start;
+ if (!mempool_offline_end)
+ mempool_offline_end = mempool_end;
+
+ if (VCADDR_TO_PHYSADDR(mempool_offline_start) != vc_cma_base) {
+ loud_error_header();
+ loud_error(
+ "__MEMPOOL_OFFLINE_START(%x -> %lx) doesn't match "
+ "vc_cma_base(%x)",
+ mempool_offline_start,
+ VCADDR_TO_PHYSADDR(mempool_offline_start),
+ vc_cma_base);
+ success = 0;
+ }
+
+ if (VCADDR_TO_PHYSADDR(mempool_offline_end) !=
+ (vc_cma_base + vc_cma_size)) {
+ loud_error_header();
+ loud_error(
+ "__MEMPOOL_OFFLINE_END(%x -> %lx) doesn't match "
+ "vc_cma_base(%x) + vc_cma_size(%x) = %x",
+ mempool_offline_start,
+ VCADDR_TO_PHYSADDR(mempool_offline_end),
+ vc_cma_base, vc_cma_size, vc_cma_base + vc_cma_size);
+ success = 0;
+ }
+
+ if (mempool_end < mempool_start) {
+ loud_error_header();
+ loud_error(
+ "__MEMPOOL_END(%x) must not be before "
+ "__MEMPOOL_START(%x)",
+ mempool_end,
+ mempool_start);
+ success = 0;
+ }
+
+ if (mempool_offline_end < mempool_offline_start) {
+ loud_error_header();
+ loud_error(
+ "__MEMPOOL_OFFLINE_END(%x) must not be before "
+ "__MEMPOOL_OFFLINE_START(%x)",
+ mempool_offline_end,
+ mempool_offline_start);
+ success = 0;
+ }
+
+ if (mempool_offline_start < mempool_start) {
+ loud_error_header();
+ loud_error(
+ "__MEMPOOL_OFFLINE_START(%x) must not be before "
+ "__MEMPOOL_START(%x)",
+ mempool_offline_start,
+ mempool_start);
+ success = 0;
+ }
+
+ if (mempool_offline_end > mempool_end) {
+ loud_error_header();
+ loud_error(
+ "__MEMPOOL_OFFLINE_END(%x) must not be after "
+ "__MEMPOOL_END(%x)",
+ mempool_offline_end,
+ mempool_end);
+ success = 0;
+ }
+
+ if ((cam_alloc_base < mempool_end) &&
+ (cam_alloc_end > mempool_start)) {
+ loud_error_header();
+ loud_error(
+ "cam_alloc pool(%x-%x) overlaps "
+ "mempool(%x-%x)",
+ cam_alloc_base, cam_alloc_end,
+ mempool_start, mempool_end);
+ success = 0;
+ }
+
+ loud_error_footer();
+
+close:
+ CloseVideoCoreMemory(mem_hndl);
+
+out:
+ return success;
+}
+#endif
+
+static int vc_cma_init(void)
+{
+ int rc = -EFAULT;
+ struct device *dev;
+
+ if (!check_cma_config())
+ goto out_release;
+
+ LOG_INFO("vc-cma: Videocore CMA driver");
+ LOG_INFO("vc-cma: vc_cma_base = %pa", &vc_cma_base);
+ LOG_INFO("vc-cma: vc_cma_size = 0x%08x (%u MiB)",
+ vc_cma_size, vc_cma_size / (1024 * 1024));
+ LOG_INFO("vc-cma: vc_cma_initial = 0x%08x (%u MiB)",
+ vc_cma_initial, vc_cma_initial / (1024 * 1024));
+
+ vc_cma_base_page = phys_to_page(vc_cma_base);
+
+ if (vc_cma_chunks) {
+ int chunks_needed = vc_cma_initial / VC_CMA_CHUNK_SIZE;
+
+ for (vc_cma_chunks_used = 0;
+ vc_cma_chunks_used < chunks_needed; vc_cma_chunks_used++) {
+ struct page *chunk;
+ chunk = dma_alloc_from_contiguous(&vc_cma_device.dev,
+ PAGES_PER_CHUNK,
+ VC_CMA_CHUNK_ORDER);
+ if (!chunk)
+ break;
+ BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
+ VC_CMA_CHUNK_SIZE) != 0);
+ }
+ if (vc_cma_chunks_used != chunks_needed) {
+ LOG_ERR("%s: dma_alloc_from_contiguous failed (%d "
+ "bytes, allocation %d of %d)",
+ __func__, VC_CMA_CHUNK_SIZE,
+ vc_cma_chunks_used, chunks_needed);
+ goto out_release;
+ }
+
+ vchiq_add_connected_callback(vc_cma_connected_init);
+ }
+
+ rc = alloc_chrdev_region(&vc_cma_devnum, 0, 1, DRIVER_NAME);
+ if (rc < 0) {
+ LOG_ERR("%s: alloc_chrdev_region failed (rc=%d)", __func__, rc);
+ goto out_release;
+ }
+
+ cdev_init(&vc_cma_cdev, &vc_cma_fops);
+ rc = cdev_add(&vc_cma_cdev, vc_cma_devnum, 1);
+ if (rc != 0) {
+ LOG_ERR("%s: cdev_add failed (rc=%d)", __func__, rc);
+ goto out_unregister;
+ }
+
+ vc_cma_class = class_create(THIS_MODULE, DRIVER_NAME);
+ if (IS_ERR(vc_cma_class)) {
+ rc = PTR_ERR(vc_cma_class);
+ LOG_ERR("%s: class_create failed (rc=%d)", __func__, rc);
+ goto out_cdev_del;
+ }
+
+ dev = device_create(vc_cma_class, NULL, vc_cma_devnum, NULL,
+ DRIVER_NAME);
+ if (IS_ERR(dev)) {
+ rc = PTR_ERR(dev);
+ LOG_ERR("%s: device_create failed (rc=%d)", __func__, rc);
+ goto out_class_destroy;
+ }
+
+ vc_cma_proc_entry = proc_create(DRIVER_NAME, 0444, NULL, &vc_cma_proc_fops);
+ if (vc_cma_proc_entry == NULL) {
+ rc = -EFAULT;
+ LOG_ERR("%s: proc_create failed", __func__);
+ goto out_device_destroy;
+ }
+
+ vc_cma_inited = 1;
+ return 0;
+
+out_device_destroy:
+ device_destroy(vc_cma_class, vc_cma_devnum);
+
+out_class_destroy:
+ class_destroy(vc_cma_class);
+ vc_cma_class = NULL;
+
+out_cdev_del:
+ cdev_del(&vc_cma_cdev);
+
+out_unregister:
+ unregister_chrdev_region(vc_cma_devnum, 1);
+
+out_release:
+ /* It is tempting to try to clean up by calling
+ dma_release_from_contiguous for all allocated chunks, but it isn't
+ a very safe thing to do. If vc_cma_initial is non-zero it is because
+ VideoCore is already using that memory, so giving it back to Linux
+ is likely to be fatal.
+ */
+ return -1;
+}
+
+/****************************************************************************
+*
+* vc_cma_exit
+*
+***************************************************************************/
+
+static void __exit vc_cma_exit(void)
+{
+ LOG_DBG("%s: called", __func__);
+
+ if (vc_cma_inited) {
+ remove_proc_entry(DRIVER_NAME, NULL);
+ device_destroy(vc_cma_class, vc_cma_devnum);
+ class_destroy(vc_cma_class);
+ cdev_del(&vc_cma_cdev);
+ unregister_chrdev_region(vc_cma_devnum, 1);
+ }
+}
+
+module_init(vc_cma_init);
+module_exit(vc_cma_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Broadcom Corporation");
--- /dev/null
+++ b/include/linux/broadcom/vc_cma.h
@@ -0,0 +1,36 @@
+/*****************************************************************************
+* Copyright 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.
+*****************************************************************************/
+
+#if !defined( VC_CMA_H )
+#define VC_CMA_H
+
+#include <linux/ioctl.h>
+
+#define VC_CMA_IOC_MAGIC 0xc5
+
+#define VC_CMA_IOC_RESERVE _IO(VC_CMA_IOC_MAGIC, 0)
+
+#ifdef __KERNEL__
+
+#ifdef CONFIG_BCM_VC_CMA
+void vc_cma_early_init(void);
+void vc_cma_reserve(void);
+#else
+static inline void vc_cma_early_init(void) { }
+static inline void vc_cma_reserve(void) { }
+#endif
+
+#endif
+
+#endif /* VC_CMA_H */
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