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path: root/drivers/gpu/drm/ttm/ttm_memory.c
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Diffstat (limited to 'drivers/gpu/drm/ttm/ttm_memory.c')
-rw-r--r--drivers/gpu/drm/ttm/ttm_memory.c234
1 files changed, 234 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_memory.c b/drivers/gpu/drm/ttm/ttm_memory.c
new file mode 100644
index 000000000000..87323d4ff68d
--- /dev/null
+++ b/drivers/gpu/drm/ttm/ttm_memory.c
@@ -0,0 +1,234 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#include "ttm/ttm_memory.h"
+#include <linux/spinlock.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+
+#define TTM_PFX "[TTM] "
+#define TTM_MEMORY_ALLOC_RETRIES 4
+
+/**
+ * At this point we only support a single shrink callback.
+ * Extend this if needed, perhaps using a linked list of callbacks.
+ * Note that this function is reentrant:
+ * many threads may try to swap out at any given time.
+ */
+
+static void ttm_shrink(struct ttm_mem_global *glob, bool from_workqueue,
+ uint64_t extra)
+{
+ int ret;
+ struct ttm_mem_shrink *shrink;
+ uint64_t target;
+ uint64_t total_target;
+
+ spin_lock(&glob->lock);
+ if (glob->shrink == NULL)
+ goto out;
+
+ if (from_workqueue) {
+ target = glob->swap_limit;
+ total_target = glob->total_memory_swap_limit;
+ } else if (capable(CAP_SYS_ADMIN)) {
+ total_target = glob->emer_total_memory;
+ target = glob->emer_memory;
+ } else {
+ total_target = glob->max_total_memory;
+ target = glob->max_memory;
+ }
+
+ total_target = (extra >= total_target) ? 0 : total_target - extra;
+ target = (extra >= target) ? 0 : target - extra;
+
+ while (glob->used_memory > target ||
+ glob->used_total_memory > total_target) {
+ shrink = glob->shrink;
+ spin_unlock(&glob->lock);
+ ret = shrink->do_shrink(shrink);
+ spin_lock(&glob->lock);
+ if (unlikely(ret != 0))
+ goto out;
+ }
+out:
+ spin_unlock(&glob->lock);
+}
+
+static void ttm_shrink_work(struct work_struct *work)
+{
+ struct ttm_mem_global *glob =
+ container_of(work, struct ttm_mem_global, work);
+
+ ttm_shrink(glob, true, 0ULL);
+}
+
+int ttm_mem_global_init(struct ttm_mem_global *glob)
+{
+ struct sysinfo si;
+ uint64_t mem;
+
+ spin_lock_init(&glob->lock);
+ glob->swap_queue = create_singlethread_workqueue("ttm_swap");
+ INIT_WORK(&glob->work, ttm_shrink_work);
+ init_waitqueue_head(&glob->queue);
+
+ si_meminfo(&si);
+
+ mem = si.totalram - si.totalhigh;
+ mem *= si.mem_unit;
+
+ glob->max_memory = mem >> 1;
+ glob->emer_memory = (mem >> 1) + (mem >> 2);
+ glob->swap_limit = glob->max_memory - (mem >> 3);
+ glob->used_memory = 0;
+ glob->used_total_memory = 0;
+ glob->shrink = NULL;
+
+ mem = si.totalram;
+ mem *= si.mem_unit;
+
+ glob->max_total_memory = mem >> 1;
+ glob->emer_total_memory = (mem >> 1) + (mem >> 2);
+
+ glob->total_memory_swap_limit = glob->max_total_memory - (mem >> 3);
+
+ printk(KERN_INFO TTM_PFX "TTM available graphics memory: %llu MiB\n",
+ glob->max_total_memory >> 20);
+ printk(KERN_INFO TTM_PFX "TTM available object memory: %llu MiB\n",
+ glob->max_memory >> 20);
+
+ return 0;
+}
+EXPORT_SYMBOL(ttm_mem_global_init);
+
+void ttm_mem_global_release(struct ttm_mem_global *glob)
+{
+ printk(KERN_INFO TTM_PFX "Used total memory is %llu bytes.\n",
+ (unsigned long long)glob->used_total_memory);
+ flush_workqueue(glob->swap_queue);
+ destroy_workqueue(glob->swap_queue);
+ glob->swap_queue = NULL;
+}
+EXPORT_SYMBOL(ttm_mem_global_release);
+
+static inline void ttm_check_swapping(struct ttm_mem_global *glob)
+{
+ bool needs_swapping;
+
+ spin_lock(&glob->lock);
+ needs_swapping = (glob->used_memory > glob->swap_limit ||
+ glob->used_total_memory >
+ glob->total_memory_swap_limit);
+ spin_unlock(&glob->lock);
+
+ if (unlikely(needs_swapping))
+ (void)queue_work(glob->swap_queue, &glob->work);
+
+}
+
+void ttm_mem_global_free(struct ttm_mem_global *glob,
+ uint64_t amount, bool himem)
+{
+ spin_lock(&glob->lock);
+ glob->used_total_memory -= amount;
+ if (!himem)
+ glob->used_memory -= amount;
+ wake_up_all(&glob->queue);
+ spin_unlock(&glob->lock);
+}
+
+static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
+ uint64_t amount, bool himem, bool reserve)
+{
+ uint64_t limit;
+ uint64_t lomem_limit;
+ int ret = -ENOMEM;
+
+ spin_lock(&glob->lock);
+
+ if (capable(CAP_SYS_ADMIN)) {
+ limit = glob->emer_total_memory;
+ lomem_limit = glob->emer_memory;
+ } else {
+ limit = glob->max_total_memory;
+ lomem_limit = glob->max_memory;
+ }
+
+ if (unlikely(glob->used_total_memory + amount > limit))
+ goto out_unlock;
+ if (unlikely(!himem && glob->used_memory + amount > lomem_limit))
+ goto out_unlock;
+
+ if (reserve) {
+ glob->used_total_memory += amount;
+ if (!himem)
+ glob->used_memory += amount;
+ }
+ ret = 0;
+out_unlock:
+ spin_unlock(&glob->lock);
+ ttm_check_swapping(glob);
+
+ return ret;
+}
+
+int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
+ bool no_wait, bool interruptible, bool himem)
+{
+ int count = TTM_MEMORY_ALLOC_RETRIES;
+
+ while (unlikely(ttm_mem_global_reserve(glob, memory, himem, true)
+ != 0)) {
+ if (no_wait)
+ return -ENOMEM;
+ if (unlikely(count-- == 0))
+ return -ENOMEM;
+ ttm_shrink(glob, false, memory + (memory >> 2) + 16);
+ }
+
+ return 0;
+}
+
+size_t ttm_round_pot(size_t size)
+{
+ if ((size & (size - 1)) == 0)
+ return size;
+ else if (size > PAGE_SIZE)
+ return PAGE_ALIGN(size);
+ else {
+ size_t tmp_size = 4;
+
+ while (tmp_size < size)
+ tmp_size <<= 1;
+
+ return tmp_size;
+ }
+ return 0;
+}