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authorDeng-Cheng Zhu <dengcheng.zhu@imgtec.com>2013-10-30 15:52:07 -0500
committerRalf Baechle <ralf@linux-mips.org>2014-01-22 20:19:02 +0100
commit17a1d523aa5826dec25f2362e1630be365167bda (patch)
tree41167321b4950d064b1834859d95da64cce3671c /arch/mips/kernel
parent1a2a6d7e8816ed2b2679a0c4f7ba4019cd31dd62 (diff)
MIPS: APRP: Add VPE loader support for CMP platforms.
This patch adds VPE loader support for platforms having a CMP. Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com> Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com> Reviewed-by: Qais Yousef <Qais.Yousef@imgtec.com> Signed-off-by: John Crispin <blogic@openwrt.org> Patchwork: http://patchwork.linux-mips.org/patch/6092/
Diffstat (limited to 'arch/mips/kernel')
-rw-r--r--arch/mips/kernel/Makefile1
-rw-r--r--arch/mips/kernel/vpe-cmp.c180
2 files changed, 181 insertions, 0 deletions
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index de28da1a8757..e5a73568aa56 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_MIPS_CMP) += smp-cmp.o
obj-$(CONFIG_CPU_MIPSR2) += spram.o
obj-$(CONFIG_MIPS_VPE_LOADER) += vpe.o
+obj-$(CONFIG_MIPS_VPE_LOADER_CMP) += vpe-cmp.o
obj-$(CONFIG_MIPS_VPE_LOADER_MT) += vpe-mt.o
obj-$(CONFIG_MIPS_VPE_APSP_API) += rtlx.o
diff --git a/arch/mips/kernel/vpe-cmp.c b/arch/mips/kernel/vpe-cmp.c
new file mode 100644
index 000000000000..9268ebc0f61e
--- /dev/null
+++ b/arch/mips/kernel/vpe-cmp.c
@@ -0,0 +1,180 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved.
+ * Copyright (C) 2013 Imagination Technologies Ltd.
+ */
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+
+#include <asm/vpe.h>
+
+static int major;
+
+void cleanup_tc(struct tc *tc)
+{
+
+}
+
+static ssize_t store_kill(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct vpe *vpe = get_vpe(aprp_cpu_index());
+ struct vpe_notifications *notifier;
+
+ list_for_each_entry(notifier, &vpe->notify, list)
+ notifier->stop(aprp_cpu_index());
+
+ release_progmem(vpe->load_addr);
+ vpe->state = VPE_STATE_UNUSED;
+
+ return len;
+}
+static DEVICE_ATTR(kill, S_IWUSR, NULL, store_kill);
+
+static ssize_t ntcs_show(struct device *cd, struct device_attribute *attr,
+ char *buf)
+{
+ struct vpe *vpe = get_vpe(aprp_cpu_index());
+
+ return sprintf(buf, "%d\n", vpe->ntcs);
+}
+
+static ssize_t ntcs_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct vpe *vpe = get_vpe(aprp_cpu_index());
+ unsigned long new;
+ int ret;
+
+ ret = kstrtoul(buf, 0, &new);
+ if (ret < 0)
+ return ret;
+
+ /* APRP can only reserve one TC in a VPE and no more. */
+ if (new != 1)
+ return -EINVAL;
+
+ vpe->ntcs = new;
+
+ return len;
+}
+static DEVICE_ATTR_RW(ntcs);
+
+static struct attribute *vpe_attrs[] = {
+ &dev_attr_kill.attr,
+ &dev_attr_ntcs.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(vpe);
+
+static void vpe_device_release(struct device *cd)
+{
+ kfree(cd);
+}
+
+static struct class vpe_class = {
+ .name = "vpe",
+ .owner = THIS_MODULE,
+ .dev_release = vpe_device_release,
+ .dev_groups = vpe_groups,
+};
+
+static struct device vpe_device;
+
+int __init vpe_module_init(void)
+{
+ struct vpe *v = NULL;
+ struct tc *t;
+ int err;
+
+ if (!cpu_has_mipsmt) {
+ pr_warn("VPE loader: not a MIPS MT capable processor\n");
+ return -ENODEV;
+ }
+
+ if (num_possible_cpus() - aprp_cpu_index() < 1) {
+ pr_warn("No VPEs reserved for AP/SP, not initialize VPE loader\n"
+ "Pass maxcpus=<n> argument as kernel argument\n");
+ return -ENODEV;
+ }
+
+ major = register_chrdev(0, VPE_MODULE_NAME, &vpe_fops);
+ if (major < 0) {
+ pr_warn("VPE loader: unable to register character device\n");
+ return major;
+ }
+
+ err = class_register(&vpe_class);
+ if (err) {
+ pr_err("vpe_class registration failed\n");
+ goto out_chrdev;
+ }
+
+ device_initialize(&vpe_device);
+ vpe_device.class = &vpe_class,
+ vpe_device.parent = NULL,
+ dev_set_name(&vpe_device, "vpe_sp");
+ vpe_device.devt = MKDEV(major, VPE_MODULE_MINOR);
+ err = device_add(&vpe_device);
+ if (err) {
+ pr_err("Adding vpe_device failed\n");
+ goto out_class;
+ }
+
+ t = alloc_tc(aprp_cpu_index());
+ if (!t) {
+ pr_warn("VPE: unable to allocate TC\n");
+ err = -ENOMEM;
+ goto out_dev;
+ }
+
+ /* VPE */
+ v = alloc_vpe(aprp_cpu_index());
+ if (v == NULL) {
+ pr_warn("VPE: unable to allocate VPE\n");
+ kfree(t);
+ err = -ENOMEM;
+ goto out_dev;
+ }
+
+ v->ntcs = 1;
+
+ /* add the tc to the list of this vpe's tc's. */
+ list_add(&t->tc, &v->tc);
+
+ /* TC */
+ t->pvpe = v; /* set the parent vpe */
+
+ return 0;
+
+out_dev:
+ device_del(&vpe_device);
+
+out_class:
+ class_unregister(&vpe_class);
+
+out_chrdev:
+ unregister_chrdev(major, VPE_MODULE_NAME);
+
+ return err;
+}
+
+void __exit vpe_module_exit(void)
+{
+ struct vpe *v, *n;
+
+ device_del(&vpe_device);
+ class_unregister(&vpe_class);
+ unregister_chrdev(major, VPE_MODULE_NAME);
+
+ /* No locking needed here */
+ list_for_each_entry_safe(v, n, &vpecontrol.vpe_list, list)
+ if (v->state != VPE_STATE_UNUSED)
+ release_vpe(v);
+}

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