Consolidate Mali integration modules

As the number of integration modules for Mali is incerasing,
we consolidate them into a single module, mali_pixel, rather
than deal with the overhead of multiple modules.

Signed-off-by: Sidath Senanayake <sidaths@google.com>
Change-Id: I32297ffcda68ec9245d99433727534848e2c20fe

1 files changed, 493 insertions, 0 deletions

diff --git a/mali_pixel/memory_group_manager.c b/mali_pixel/memory_group_manager.c
new file mode 100644
index 0000000..44f848a
--- /dev/null
+++ b/mali_pixel/memory_group_manager.c
@@ -0,0 +1,493 @@
+/*
+ *
+ * (C) COPYRIGHT 2019 ARM Limited. All rights reserved.
+ *
+ * This program is free software and is provided to you under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation, and any use by you of this program is subject to the terms
+ * of such GNU licence.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you can access it online at
+ * http://www.gnu.org/licenses/gpl-2.0.html.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ *
+ */
+
+#include <linux/fs.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/version.h>
+#include <linux/module.h>
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+#endif
+#include <linux/mm.h>
+#include <linux/memory_group_manager.h>
+
+#if (KERNEL_VERSION(4, 20, 0) > LINUX_VERSION_CODE)
+static inline vm_fault_t vmf_insert_pfn_prot(struct vm_area_struct *vma,
+			unsigned long addr, unsigned long pfn, pgprot_t pgprot)
+{
+	int err;
+
+#if ((KERNEL_VERSION(4, 4, 147) >= LINUX_VERSION_CODE) || \
+		((KERNEL_VERSION(4, 6, 0) > LINUX_VERSION_CODE) && \
+		 (KERNEL_VERSION(4, 5, 0) <= LINUX_VERSION_CODE)))
+	if (pgprot_val(pgprot) != pgprot_val(vma->vm_page_prot))
+		return VM_FAULT_SIGBUS;
+
+	err = vm_insert_pfn(vma, addr, pfn);
+#else
+	err = vm_insert_pfn_prot(vma, addr, pfn, pgprot);
+#endif
+
+	if (unlikely(err == -ENOMEM))
+		return VM_FAULT_OOM;
+	if (unlikely(err < 0 && err != -EBUSY))
+		return VM_FAULT_SIGBUS;
+
+	return VM_FAULT_NOPAGE;
+}
+#endif
+
+#define IMPORTED_MEMORY_ID (MEMORY_GROUP_MANAGER_NR_GROUPS - 1)
+
+/**
+ * struct mgm_group - Structure to keep track of the number of allocated
+ *                    pages per group
+ *
+ * @size:  The number of allocated small(4KB) pages
+ * @lp_size:  The number of allocated large(2MB) pages
+ * @insert_pfn: The number of calls to map pages for CPU access.
+ * @update_gpu_pte: The number of calls to update GPU page table entries.
+ *
+ * This structure allows page allocation information to be displayed via
+ * debugfs. Display is organized per group with small and large sized pages.
+ */
+struct mgm_group {
+	size_t size;
+	size_t lp_size;
+	size_t insert_pfn;
+	size_t update_gpu_pte;
+};
+
+/**
+ * struct mgm_groups - Structure for groups of memory group manager
+ *
+ * @groups: To keep track of the number of allocated pages of all groups
+ * @dev: device attached
+ * @mgm_debugfs_root: debugfs root directory of memory group manager
+ *
+ * This structure allows page allocation information to be displayed via
+ * debugfs. Display is organized per group with small and large sized pages.
+ */
+struct mgm_groups {
+	struct mgm_group groups[MEMORY_GROUP_MANAGER_NR_GROUPS];
+	struct device *dev;
+#ifdef CONFIG_DEBUG_FS
+	struct dentry *mgm_debugfs_root;
+#endif
+};
+
+#ifdef CONFIG_DEBUG_FS
+
+static int mgm_size_get(void *data, u64 *val)
+{
+	struct mgm_group *group = data;
+
+	*val = group->size;
+
+	return 0;
+}
+
+static int mgm_lp_size_get(void *data, u64 *val)
+{
+	struct mgm_group *group = data;
+
+	*val = group->lp_size;
+
+	return 0;
+}
+
+static int mgm_insert_pfn_get(void *data, u64 *val)
+{
+	struct mgm_group *group = data;
+
+	*val = group->insert_pfn;
+
+	return 0;
+}
+
+static int mgm_update_gpu_pte_get(void *data, u64 *val)
+{
+	struct mgm_group *group = data;
+
+	*val = group->update_gpu_pte;
+
+	return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_mgm_size, mgm_size_get, NULL, "%llu\n");
+DEFINE_SIMPLE_ATTRIBUTE(fops_mgm_lp_size, mgm_lp_size_get, NULL, "%llu\n");
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_mgm_insert_pfn, mgm_insert_pfn_get, NULL,
+	"%llu\n");
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_mgm_update_gpu_pte, mgm_update_gpu_pte_get, NULL,
+	"%llu\n");
+
+static void mgm_term_debugfs(struct mgm_groups *data)
+{
+	debugfs_remove_recursive(data->mgm_debugfs_root);
+}
+
+#define MGM_DEBUGFS_GROUP_NAME_MAX 10
+static int mgm_initialize_debugfs(struct mgm_groups *mgm_data)
+{
+	int i;
+	struct dentry *e, *g;
+	char debugfs_group_name[MGM_DEBUGFS_GROUP_NAME_MAX];
+
+	/*
+	 * Create root directory of memory-group-manager
+	 */
+	mgm_data->mgm_debugfs_root =
+		debugfs_create_dir("physical-memory-group-manager", NULL);
+	if (IS_ERR(mgm_data->mgm_debugfs_root)) {
+		dev_err(mgm_data->dev, "fail to create debugfs root directory\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * Create debugfs files per group
+	 */
+	for (i = 0; i < MEMORY_GROUP_MANAGER_NR_GROUPS; i++) {
+		scnprintf(debugfs_group_name, MGM_DEBUGFS_GROUP_NAME_MAX,
+				"group_%d", i);
+		g = debugfs_create_dir(debugfs_group_name,
+				mgm_data->mgm_debugfs_root);
+		if (IS_ERR(g)) {
+			dev_err(mgm_data->dev, "fail to create group[%d]\n", i);
+			goto remove_debugfs;
+		}
+
+		e = debugfs_create_file("size", 0444, g, &mgm_data->groups[i],
+				&fops_mgm_size);
+		if (IS_ERR(e)) {
+			dev_err(mgm_data->dev, "fail to create size[%d]\n", i);
+			goto remove_debugfs;
+		}
+
+		e = debugfs_create_file("lp_size", 0444, g,
+				&mgm_data->groups[i], &fops_mgm_lp_size);
+		if (IS_ERR(e)) {
+			dev_err(mgm_data->dev,
+				"fail to create lp_size[%d]\n", i);
+			goto remove_debugfs;
+		}
+
+		e = debugfs_create_file("insert_pfn", 0444, g,
+				&mgm_data->groups[i], &fops_mgm_insert_pfn);
+		if (IS_ERR(e)) {
+			dev_err(mgm_data->dev,
+				"fail to create insert_pfn[%d]\n", i);
+			goto remove_debugfs;
+		}
+
+		e = debugfs_create_file("update_gpu_pte", 0444, g,
+				&mgm_data->groups[i], &fops_mgm_update_gpu_pte);
+		if (IS_ERR(e)) {
+			dev_err(mgm_data->dev,
+				"fail to create update_gpu_pte[%d]\n", i);
+			goto remove_debugfs;
+		}
+	}
+
+	return 0;
+
+remove_debugfs:
+	mgm_term_debugfs(mgm_data);
+	return -ENODEV;
+}
+
+#else
+
+static void mgm_term_debugfs(struct mgm_groups *data)
+{
+}
+
+static int mgm_initialize_debugfs(struct mgm_groups *mgm_data)
+{
+	return 0;
+}
+
+#endif /* CONFIG_DEBUG_FS */
+
+#define ORDER_SMALL_PAGE 0
+#define ORDER_LARGE_PAGE 9
+static void update_size(struct memory_group_manager_device *mgm_dev, int
+		group_id, int order, bool alloc)
+{
+	struct mgm_groups *data = mgm_dev->data;
+
+	switch (order) {
+	case ORDER_SMALL_PAGE:
+		if (alloc)
+			data->groups[group_id].size++;
+		else {
+			WARN_ON(data->groups[group_id].size == 0);
+			data->groups[group_id].size--;
+		}
+	break;
+
+	case ORDER_LARGE_PAGE:
+		if (alloc)
+			data->groups[group_id].lp_size++;
+		else {
+			WARN_ON(data->groups[group_id].lp_size == 0);
+			data->groups[group_id].lp_size--;
+		}
+	break;
+
+	default:
+		dev_err(data->dev, "Unknown order(%d)\n", order);
+	break;
+	}
+}
+
+static struct page *example_mgm_alloc_page(
+	struct memory_group_manager_device *mgm_dev, int group_id,
+	gfp_t gfp_mask, unsigned int order)
+{
+	struct mgm_groups *const data = mgm_dev->data;
+	struct page *p;
+
+	dev_dbg(data->dev, "%s(mgm_dev=%p, group_id=%d gfp_mask=0x%x order=%u\n",
+		__func__, (void *)mgm_dev, group_id, gfp_mask, order);
+
+	if (WARN_ON(group_id < 0) ||
+		WARN_ON(group_id >= MEMORY_GROUP_MANAGER_NR_GROUPS))
+		return NULL;
+
+	p = alloc_pages(gfp_mask, order);
+
+	if (p) {
+		update_size(mgm_dev, group_id, order, true);
+	} else {
+		struct mgm_groups *data = mgm_dev->data;
+
+		dev_err(data->dev, "alloc_pages failed\n");
+	}
+
+	return p;
+}
+
+static void example_mgm_free_page(
+	struct memory_group_manager_device *mgm_dev, int group_id,
+	struct page *page, unsigned int order)
+{
+	struct mgm_groups *const data = mgm_dev->data;
+
+	dev_dbg(data->dev, "%s(mgm_dev=%p, group_id=%d page=%p order=%u\n",
+		__func__, (void *)mgm_dev, group_id, (void *)page, order);
+
+	if (WARN_ON(group_id < 0) ||
+		WARN_ON(group_id >= MEMORY_GROUP_MANAGER_NR_GROUPS))
+		return;
+
+	__free_pages(page, order);
+
+	update_size(mgm_dev, group_id, order, false);
+}
+
+static int example_mgm_get_import_memory_id(
+	struct memory_group_manager_device *mgm_dev,
+	struct memory_group_manager_import_data *import_data)
+{
+	struct mgm_groups *const data = mgm_dev->data;
+
+	dev_dbg(data->dev, "%s(mgm_dev=%p, import_data=%p (type=%d)\n",
+		__func__, (void *)mgm_dev, (void *)import_data,
+		(int)import_data->type);
+
+	if (!WARN_ON(!import_data)) {
+		WARN_ON(!import_data->u.dma_buf);
+
+		WARN_ON(import_data->type !=
+				MEMORY_GROUP_MANAGER_IMPORT_TYPE_DMA_BUF);
+	}
+
+	return IMPORTED_MEMORY_ID;
+}
+
+static u64 example_mgm_update_gpu_pte(
+	struct memory_group_manager_device *const mgm_dev, int const group_id,
+	int const mmu_level, u64 pte)
+{
+	struct mgm_groups *const data = mgm_dev->data;
+	const u32 pbha_bit_pos = 59; /* bits 62:59 */
+	const u32 pbha_bit_mask = 0xf; /* 4-bit */
+
+	dev_dbg(data->dev,
+		"%s(mgm_dev=%p, group_id=%d, mmu_level=%d, pte=0x%llx)\n",
+		__func__, (void *)mgm_dev, group_id, mmu_level, pte);
+
+	if (WARN_ON(group_id < 0) ||
+		WARN_ON(group_id >= MEMORY_GROUP_MANAGER_NR_GROUPS))
+		return pte;
+
+	pte |= ((u64)group_id & pbha_bit_mask) << pbha_bit_pos;
+
+	data->groups[group_id].update_gpu_pte++;
+
+	return pte;
+}
+
+static vm_fault_t example_mgm_vmf_insert_pfn_prot(
+	struct memory_group_manager_device *const mgm_dev, int const group_id,
+	struct vm_area_struct *const vma, unsigned long const addr,
+	unsigned long const pfn, pgprot_t const prot)
+{
+	struct mgm_groups *const data = mgm_dev->data;
+	vm_fault_t fault;
+
+	dev_dbg(data->dev,
+		"%s(mgm_dev=%p, group_id=%d, vma=%p, addr=0x%lx, pfn=0x%lx, prot=0x%llx)\n",
+		__func__, (void *)mgm_dev, group_id, (void *)vma, addr, pfn,
+		(unsigned long long int) pgprot_val(prot));
+
+	if (WARN_ON(group_id < 0) ||
+		WARN_ON(group_id >= MEMORY_GROUP_MANAGER_NR_GROUPS))
+		return VM_FAULT_SIGBUS;
+
+	fault = vmf_insert_pfn_prot(vma, addr, pfn, prot);
+
+	if (fault == VM_FAULT_NOPAGE)
+		data->groups[group_id].insert_pfn++;
+	else
+		dev_err(data->dev, "vmf_insert_pfn_prot failed\n");
+
+	return fault;
+}
+
+static int mgm_initialize_data(struct mgm_groups *mgm_data)
+{
+	int i;
+
+	for (i = 0; i < MEMORY_GROUP_MANAGER_NR_GROUPS; i++) {
+		mgm_data->groups[i].size = 0;
+		mgm_data->groups[i].lp_size = 0;
+		mgm_data->groups[i].insert_pfn = 0;
+		mgm_data->groups[i].update_gpu_pte = 0;
+	}
+
+	return mgm_initialize_debugfs(mgm_data);
+}
+
+static void mgm_term_data(struct mgm_groups *data)
+{
+	int i;
+
+	for (i = 0; i < MEMORY_GROUP_MANAGER_NR_GROUPS; i++) {
+		if (data->groups[i].size != 0)
+			dev_warn(data->dev,
+				"%zu 0-order pages in group(%d) leaked\n",
+				data->groups[i].size, i);
+		if (data->groups[i].lp_size != 0)
+			dev_warn(data->dev,
+				"%zu 9 order pages in group(%d) leaked\n",
+				data->groups[i].lp_size, i);
+	}
+
+	mgm_term_debugfs(data);
+}
+
+static int memory_group_manager_probe(struct platform_device *pdev)
+{
+	struct memory_group_manager_device *mgm_dev;
+	struct mgm_groups *mgm_data;
+
+	mgm_dev = kzalloc(sizeof(*mgm_dev), GFP_KERNEL);
+	if (!mgm_dev)
+		return -ENOMEM;
+
+	mgm_dev->owner = THIS_MODULE;
+	mgm_dev->ops.mgm_alloc_page = example_mgm_alloc_page;
+	mgm_dev->ops.mgm_free_page = example_mgm_free_page;
+	mgm_dev->ops.mgm_get_import_memory_id =
+			example_mgm_get_import_memory_id;
+	mgm_dev->ops.mgm_vmf_insert_pfn_prot = example_mgm_vmf_insert_pfn_prot;
+	mgm_dev->ops.mgm_update_gpu_pte = example_mgm_update_gpu_pte;
+
+	mgm_data = kzalloc(sizeof(*mgm_data), GFP_KERNEL);
+	if (!mgm_data) {
+		kfree(mgm_dev);
+		return -ENOMEM;
+	}
+
+	mgm_dev->data = mgm_data;
+	mgm_data->dev = &pdev->dev;
+
+	if (mgm_initialize_data(mgm_data)) {
+		kfree(mgm_data);
+		kfree(mgm_dev);
+		return -ENOENT;
+	}
+
+	platform_set_drvdata(pdev, mgm_dev);
+	dev_info(&pdev->dev, "Memory group manager probed successfully\n");
+
+	return 0;
+}
+
+static int memory_group_manager_remove(struct platform_device *pdev)
+{
+	struct memory_group_manager_device *mgm_dev =
+		platform_get_drvdata(pdev);
+	struct mgm_groups *mgm_data = mgm_dev->data;
+
+	mgm_term_data(mgm_data);
+	kfree(mgm_data);
+
+	kfree(mgm_dev);
+
+	dev_info(&pdev->dev, "Memory group manager removed successfully\n");
+
+	return 0;
+}
+
+static const struct of_device_id memory_group_manager_dt_ids[] = {
+	{ .compatible = "arm,physical-memory-group-manager" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, memory_group_manager_dt_ids);
+
+static struct platform_driver memory_group_manager_driver = {
+	.probe = memory_group_manager_probe,
+	.remove = memory_group_manager_remove,
+	.driver = {
+		.name = "physical-memory-group-manager",
+		.owner = THIS_MODULE,
+		.of_match_table = of_match_ptr(memory_group_manager_dt_ids),
+		/*
+		 * Prevent the mgm_dev from being unbound and freed, as other's
+		 * may have pointers to it and would get confused, or crash, if
+		 * it suddenly disappear.
+		 */
+		.suppress_bind_attrs = true,
+	}
+};
+
+module_platform_driver(memory_group_manager_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("ARM Ltd.");
+MODULE_VERSION("1.0");