/*
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*
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* (C) COPYRIGHT 2013-2017 ARM Limited. All rights reserved.
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*
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* This program is free software and is provided to you under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation, and any use by you of this program is subject to the terms
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* of such GNU licence.
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*
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* A copy of the licence is included with the program, and can also be obtained
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* from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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/*
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* Debugfs interface to dump the memory visible to the GPU
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*/
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#include "mali_kbase_debug_mem_view.h"
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#include "mali_kbase.h"
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#include <linux/list.h>
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#include <linux/file.h>
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#ifdef CONFIG_DEBUG_FS
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struct debug_mem_mapping {
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struct list_head node;
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struct kbase_mem_phy_alloc *alloc;
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unsigned long flags;
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u64 start_pfn;
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size_t nr_pages;
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};
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struct debug_mem_data {
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struct list_head mapping_list;
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struct kbase_context *kctx;
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};
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struct debug_mem_seq_off {
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struct list_head *lh;
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size_t offset;
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};
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static void *debug_mem_start(struct seq_file *m, loff_t *_pos)
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{
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struct debug_mem_data *mem_data = m->private;
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struct debug_mem_seq_off *data;
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struct debug_mem_mapping *map;
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loff_t pos = *_pos;
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list_for_each_entry(map, &mem_data->mapping_list, node) {
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if (pos >= map->nr_pages) {
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pos -= map->nr_pages;
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} else {
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data = kmalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return NULL;
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data->lh = &map->node;
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data->offset = pos;
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return data;
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}
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}
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/* Beyond the end */
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return NULL;
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}
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static void debug_mem_stop(struct seq_file *m, void *v)
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{
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kfree(v);
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}
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static void *debug_mem_next(struct seq_file *m, void *v, loff_t *pos)
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{
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struct debug_mem_data *mem_data = m->private;
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struct debug_mem_seq_off *data = v;
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struct debug_mem_mapping *map;
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map = list_entry(data->lh, struct debug_mem_mapping, node);
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if (data->offset < map->nr_pages - 1) {
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data->offset++;
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++*pos;
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return data;
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}
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if (list_is_last(data->lh, &mem_data->mapping_list)) {
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kfree(data);
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return NULL;
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}
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data->lh = data->lh->next;
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data->offset = 0;
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++*pos;
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return data;
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}
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static int debug_mem_show(struct seq_file *m, void *v)
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{
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struct debug_mem_data *mem_data = m->private;
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struct debug_mem_seq_off *data = v;
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struct debug_mem_mapping *map;
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int i, j;
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struct page *page;
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uint32_t *mapping;
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pgprot_t prot = PAGE_KERNEL;
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map = list_entry(data->lh, struct debug_mem_mapping, node);
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kbase_gpu_vm_lock(mem_data->kctx);
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if (data->offset >= map->alloc->nents) {
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seq_printf(m, "%016llx: Unbacked page\n\n", (map->start_pfn +
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data->offset) << PAGE_SHIFT);
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goto out;
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}
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if (!(map->flags & KBASE_REG_CPU_CACHED))
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prot = pgprot_writecombine(prot);
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page = pfn_to_page(PFN_DOWN(map->alloc->pages[data->offset]));
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mapping = vmap(&page, 1, VM_MAP, prot);
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if (!mapping)
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goto out;
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for (i = 0; i < PAGE_SIZE; i += 4*sizeof(*mapping)) {
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seq_printf(m, "%016llx:", i + ((map->start_pfn +
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data->offset) << PAGE_SHIFT));
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for (j = 0; j < 4*sizeof(*mapping); j += sizeof(*mapping))
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seq_printf(m, " %08x", mapping[(i+j)/sizeof(*mapping)]);
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seq_putc(m, '\n');
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}
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vunmap(mapping);
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seq_putc(m, '\n');
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out:
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kbase_gpu_vm_unlock(mem_data->kctx);
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return 0;
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}
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static const struct seq_operations ops = {
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.start = debug_mem_start,
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.next = debug_mem_next,
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.stop = debug_mem_stop,
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.show = debug_mem_show,
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};
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static int debug_mem_zone_open(struct rb_root *rbtree,
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struct debug_mem_data *mem_data)
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{
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int ret = 0;
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struct rb_node *p;
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struct kbase_va_region *reg;
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struct debug_mem_mapping *mapping;
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for (p = rb_first(rbtree); p; p = rb_next(p)) {
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reg = rb_entry(p, struct kbase_va_region, rblink);
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if (reg->gpu_alloc == NULL)
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/* Empty region - ignore */
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continue;
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mapping = kmalloc(sizeof(*mapping), GFP_KERNEL);
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if (!mapping) {
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ret = -ENOMEM;
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goto out;
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}
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mapping->alloc = kbase_mem_phy_alloc_get(reg->gpu_alloc);
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mapping->start_pfn = reg->start_pfn;
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mapping->nr_pages = reg->nr_pages;
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mapping->flags = reg->flags;
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list_add_tail(&mapping->node, &mem_data->mapping_list);
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}
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out:
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return ret;
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}
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static int debug_mem_open(struct inode *i, struct file *file)
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{
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struct file *kctx_file = i->i_private;
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struct kbase_context *kctx = kctx_file->private_data;
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struct debug_mem_data *mem_data;
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int ret;
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ret = seq_open(file, &ops);
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if (ret)
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return ret;
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mem_data = kmalloc(sizeof(*mem_data), GFP_KERNEL);
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if (!mem_data) {
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ret = -ENOMEM;
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goto out;
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}
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mem_data->kctx = kctx;
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INIT_LIST_HEAD(&mem_data->mapping_list);
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get_file(kctx_file);
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kbase_gpu_vm_lock(kctx);
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ret = debug_mem_zone_open(&kctx->reg_rbtree_same, mem_data);
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if (0 != ret) {
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kbase_gpu_vm_unlock(kctx);
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goto out;
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}
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ret = debug_mem_zone_open(&kctx->reg_rbtree_exec, mem_data);
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if (0 != ret) {
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kbase_gpu_vm_unlock(kctx);
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goto out;
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}
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ret = debug_mem_zone_open(&kctx->reg_rbtree_custom, mem_data);
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if (0 != ret) {
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kbase_gpu_vm_unlock(kctx);
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goto out;
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}
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kbase_gpu_vm_unlock(kctx);
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((struct seq_file *)file->private_data)->private = mem_data;
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return 0;
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out:
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if (mem_data) {
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while (!list_empty(&mem_data->mapping_list)) {
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struct debug_mem_mapping *mapping;
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mapping = list_first_entry(&mem_data->mapping_list,
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struct debug_mem_mapping, node);
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kbase_mem_phy_alloc_put(mapping->alloc);
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list_del(&mapping->node);
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kfree(mapping);
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}
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fput(kctx_file);
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kfree(mem_data);
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}
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seq_release(i, file);
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return ret;
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}
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static int debug_mem_release(struct inode *inode, struct file *file)
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{
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struct file *kctx_file = inode->i_private;
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struct seq_file *sfile = file->private_data;
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struct debug_mem_data *mem_data = sfile->private;
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struct debug_mem_mapping *mapping;
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seq_release(inode, file);
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while (!list_empty(&mem_data->mapping_list)) {
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mapping = list_first_entry(&mem_data->mapping_list,
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struct debug_mem_mapping, node);
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kbase_mem_phy_alloc_put(mapping->alloc);
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list_del(&mapping->node);
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kfree(mapping);
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}
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kfree(mem_data);
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fput(kctx_file);
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return 0;
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}
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static const struct file_operations kbase_debug_mem_view_fops = {
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.open = debug_mem_open,
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.release = debug_mem_release,
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.read = seq_read,
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.llseek = seq_lseek
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};
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/**
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* kbase_debug_mem_view_init - Initialise the mem_view sysfs file
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* @kctx_file: The /dev/mali0 file instance for the context
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*
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* This function creates a "mem_view" file which can be used to get a view of
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* the context's memory as the GPU sees it (i.e. using the GPU's page tables).
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*
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* The file is cleaned up by a call to debugfs_remove_recursive() deleting the
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* parent directory.
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*/
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void kbase_debug_mem_view_init(struct file *kctx_file)
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{
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struct kbase_context *kctx = kctx_file->private_data;
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debugfs_create_file("mem_view", S_IRUGO, kctx->kctx_dentry, kctx_file,
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&kbase_debug_mem_view_fops);
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}
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#endif
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