drm/ttm: Memory accounting rework.
Use inclusive zones to simplify accounting and its sysfs representation.
Use DMA32 accounting where applicable.
Add a sysfs interface to make the heuristically determined limits
readable and configurable.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/gpu/drm/ttm/ttm_memory.c b/drivers/gpu/drm/ttm/ttm_memory.c
index 87323d4..62fb5cf 100644
--- a/drivers/gpu/drm/ttm/ttm_memory.c
+++ b/drivers/gpu/drm/ttm/ttm_memory.c
@@ -26,15 +26,180 @@
**************************************************************************/
#include "ttm/ttm_memory.h"
+#include "ttm/ttm_module.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
+struct ttm_mem_zone {
+ struct kobject kobj;
+ struct ttm_mem_global *glob;
+ const char *name;
+ uint64_t zone_mem;
+ uint64_t emer_mem;
+ uint64_t max_mem;
+ uint64_t swap_limit;
+ uint64_t used_mem;
+};
+
+static struct attribute ttm_mem_sys = {
+ .name = "zone_memory",
+ .mode = S_IRUGO
+};
+static struct attribute ttm_mem_emer = {
+ .name = "emergency_memory",
+ .mode = S_IRUGO | S_IWUSR
+};
+static struct attribute ttm_mem_max = {
+ .name = "available_memory",
+ .mode = S_IRUGO | S_IWUSR
+};
+static struct attribute ttm_mem_swap = {
+ .name = "swap_limit",
+ .mode = S_IRUGO | S_IWUSR
+};
+static struct attribute ttm_mem_used = {
+ .name = "used_memory",
+ .mode = S_IRUGO
+};
+
+static void ttm_mem_zone_kobj_release(struct kobject *kobj)
+{
+ struct ttm_mem_zone *zone =
+ container_of(kobj, struct ttm_mem_zone, kobj);
+
+ printk(KERN_INFO TTM_PFX
+ "Zone %7s: Used memory at exit: %llu kiB.\n",
+ zone->name, (unsigned long long) zone->used_mem >> 10);
+ kfree(zone);
+}
+
+static ssize_t ttm_mem_zone_show(struct kobject *kobj,
+ struct attribute *attr,
+ char *buffer)
+{
+ struct ttm_mem_zone *zone =
+ container_of(kobj, struct ttm_mem_zone, kobj);
+ uint64_t val = 0;
+
+ spin_lock(&zone->glob->lock);
+ if (attr == &ttm_mem_sys)
+ val = zone->zone_mem;
+ else if (attr == &ttm_mem_emer)
+ val = zone->emer_mem;
+ else if (attr == &ttm_mem_max)
+ val = zone->max_mem;
+ else if (attr == &ttm_mem_swap)
+ val = zone->swap_limit;
+ else if (attr == &ttm_mem_used)
+ val = zone->used_mem;
+ spin_unlock(&zone->glob->lock);
+
+ return snprintf(buffer, PAGE_SIZE, "%llu\n",
+ (unsigned long long) val >> 10);
+}
+
+static void ttm_check_swapping(struct ttm_mem_global *glob);
+
+static ssize_t ttm_mem_zone_store(struct kobject *kobj,
+ struct attribute *attr,
+ const char *buffer,
+ size_t size)
+{
+ struct ttm_mem_zone *zone =
+ container_of(kobj, struct ttm_mem_zone, kobj);
+ int chars;
+ unsigned long val;
+ uint64_t val64;
+
+ chars = sscanf(buffer, "%lu", &val);
+ if (chars == 0)
+ return size;
+
+ val64 = val;
+ val64 <<= 10;
+
+ spin_lock(&zone->glob->lock);
+ if (val64 > zone->zone_mem)
+ val64 = zone->zone_mem;
+ if (attr == &ttm_mem_emer) {
+ zone->emer_mem = val64;
+ if (zone->max_mem > val64)
+ zone->max_mem = val64;
+ } else if (attr == &ttm_mem_max) {
+ zone->max_mem = val64;
+ if (zone->emer_mem < val64)
+ zone->emer_mem = val64;
+ } else if (attr == &ttm_mem_swap)
+ zone->swap_limit = val64;
+ spin_unlock(&zone->glob->lock);
+
+ ttm_check_swapping(zone->glob);
+
+ return size;
+}
+
+static struct attribute *ttm_mem_zone_attrs[] = {
+ &ttm_mem_sys,
+ &ttm_mem_emer,
+ &ttm_mem_max,
+ &ttm_mem_swap,
+ &ttm_mem_used,
+ NULL
+};
+
+static struct sysfs_ops ttm_mem_zone_ops = {
+ .show = &ttm_mem_zone_show,
+ .store = &ttm_mem_zone_store
+};
+
+static struct kobj_type ttm_mem_zone_kobj_type = {
+ .release = &ttm_mem_zone_kobj_release,
+ .sysfs_ops = &ttm_mem_zone_ops,
+ .default_attrs = ttm_mem_zone_attrs,
+};
+
+static void ttm_mem_global_kobj_release(struct kobject *kobj)
+{
+ struct ttm_mem_global *glob =
+ container_of(kobj, struct ttm_mem_global, kobj);
+
+ kfree(glob);
+}
+
+static struct kobj_type ttm_mem_glob_kobj_type = {
+ .release = &ttm_mem_global_kobj_release,
+};
+
+static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
+ bool from_wq, uint64_t extra)
+{
+ unsigned int i;
+ struct ttm_mem_zone *zone;
+ uint64_t target;
+
+ for (i = 0; i < glob->num_zones; ++i) {
+ zone = glob->zones[i];
+
+ if (from_wq)
+ target = zone->swap_limit;
+ else if (capable(CAP_SYS_ADMIN))
+ target = zone->emer_mem;
+ else
+ target = zone->max_mem;
+
+ target = (extra > target) ? 0ULL : target;
+
+ if (zone->used_mem > target)
+ return true;
+ }
+ return false;
+}
+
/**
* At this point we only support a single shrink callback.
* Extend this if needed, perhaps using a linked list of callbacks.
@@ -42,34 +207,17 @@
* many threads may try to swap out at any given time.
*/
-static void ttm_shrink(struct ttm_mem_global *glob, bool from_workqueue,
+static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
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) {
+ while (ttm_zones_above_swap_target(glob, from_wq, extra)) {
shrink = glob->shrink;
spin_unlock(&glob->lock);
ret = shrink->do_shrink(shrink);
@@ -81,6 +229,8 @@
spin_unlock(&glob->lock);
}
+
+
static void ttm_shrink_work(struct work_struct *work)
{
struct ttm_mem_global *glob =
@@ -89,63 +239,178 @@
ttm_shrink(glob, true, 0ULL);
}
+static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
+ const struct sysinfo *si)
+{
+ struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
+ uint64_t mem;
+
+ if (unlikely(!zone))
+ return -ENOMEM;
+
+ mem = si->totalram - si->totalhigh;
+ mem *= si->mem_unit;
+
+ zone->name = "kernel";
+ zone->zone_mem = mem;
+ zone->max_mem = mem >> 1;
+ zone->emer_mem = (mem >> 1) + (mem >> 2);
+ zone->swap_limit = zone->max_mem - (mem >> 3);
+ zone->used_mem = 0;
+ zone->glob = glob;
+ glob->zone_kernel = zone;
+ glob->zones[glob->num_zones++] = zone;
+ kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
+ return kobject_add(&zone->kobj, &glob->kobj, zone->name);
+}
+
+#ifdef CONFIG_HIGHMEM
+static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob,
+ const struct sysinfo *si)
+{
+ struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
+ uint64_t mem;
+
+ if (unlikely(!zone))
+ return -ENOMEM;
+
+ if (si->totalhigh == 0)
+ return 0;
+
+ mem = si->totalram;
+ mem *= si->mem_unit;
+
+ zone->name = "highmem";
+ zone->zone_mem = mem;
+ zone->max_mem = mem >> 1;
+ zone->emer_mem = (mem >> 1) + (mem >> 2);
+ zone->swap_limit = zone->max_mem - (mem >> 3);
+ zone->used_mem = 0;
+ zone->glob = glob;
+ glob->zone_highmem = zone;
+ glob->zones[glob->num_zones++] = zone;
+ kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
+ return kobject_add(&zone->kobj, &glob->kobj, zone->name);
+}
+#else
+static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
+ const struct sysinfo *si)
+{
+ struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
+ uint64_t mem;
+
+ if (unlikely(!zone))
+ return -ENOMEM;
+
+ mem = si->totalram;
+ mem *= si->mem_unit;
+
+ /**
+ * No special dma32 zone needed.
+ */
+
+ if (mem <= ((uint64_t) 1ULL << 32))
+ return 0;
+
+ /*
+ * Limit max dma32 memory to 4GB for now
+ * until we can figure out how big this
+ * zone really is.
+ */
+
+ mem = ((uint64_t) 1ULL << 32);
+ zone->name = "dma32";
+ zone->zone_mem = mem;
+ zone->max_mem = mem >> 1;
+ zone->emer_mem = (mem >> 1) + (mem >> 2);
+ zone->swap_limit = zone->max_mem - (mem >> 3);
+ zone->used_mem = 0;
+ zone->glob = glob;
+ glob->zone_dma32 = zone;
+ glob->zones[glob->num_zones++] = zone;
+ kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
+ return kobject_add(&zone->kobj, &glob->kobj, zone->name);
+}
+#endif
+
int ttm_mem_global_init(struct ttm_mem_global *glob)
{
struct sysinfo si;
- uint64_t mem;
+ int ret;
+ int i;
+ struct ttm_mem_zone *zone;
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);
+ kobject_init(&glob->kobj, &ttm_mem_glob_kobj_type);
+ ret = kobject_add(&glob->kobj,
+ ttm_get_kobj(),
+ "memory_accounting");
+ if (unlikely(ret != 0))
+ goto out_no_zone;
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);
-
+ ret = ttm_mem_init_kernel_zone(glob, &si);
+ if (unlikely(ret != 0))
+ goto out_no_zone;
+#ifdef CONFIG_HIGHMEM
+ ret = ttm_mem_init_highmem_zone(glob, &si);
+ if (unlikely(ret != 0))
+ goto out_no_zone;
+#else
+ ret = ttm_mem_init_dma32_zone(glob, &si);
+ if (unlikely(ret != 0))
+ goto out_no_zone;
+#endif
+ for (i = 0; i < glob->num_zones; ++i) {
+ zone = glob->zones[i];
+ printk(KERN_INFO TTM_PFX
+ "Zone %7s: Available graphics memory: %llu kiB.\n",
+ zone->name, (unsigned long long) zone->max_mem >> 10);
+ }
return 0;
+out_no_zone:
+ ttm_mem_global_release(glob);
+ return ret;
}
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);
+ unsigned int i;
+ struct ttm_mem_zone *zone;
+
flush_workqueue(glob->swap_queue);
destroy_workqueue(glob->swap_queue);
glob->swap_queue = NULL;
+ for (i = 0; i < glob->num_zones; ++i) {
+ zone = glob->zones[i];
+ kobject_del(&zone->kobj);
+ kobject_put(&zone->kobj);
+ }
+ kobject_del(&glob->kobj);
+ kobject_put(&glob->kobj);
}
EXPORT_SYMBOL(ttm_mem_global_release);
-static inline void ttm_check_swapping(struct ttm_mem_global *glob)
+static void ttm_check_swapping(struct ttm_mem_global *glob)
{
- bool needs_swapping;
+ bool needs_swapping = false;
+ unsigned int i;
+ struct ttm_mem_zone *zone;
spin_lock(&glob->lock);
- needs_swapping = (glob->used_memory > glob->swap_limit ||
- glob->used_total_memory >
- glob->total_memory_swap_limit);
+ for (i = 0; i < glob->num_zones; ++i) {
+ zone = glob->zones[i];
+ if (zone->used_mem > zone->swap_limit) {
+ needs_swapping = true;
+ break;
+ }
+ }
+
spin_unlock(&glob->lock);
if (unlikely(needs_swapping))
@@ -153,44 +418,60 @@
}
-void ttm_mem_global_free(struct ttm_mem_global *glob,
- uint64_t amount, bool himem)
+static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
+ struct ttm_mem_zone *single_zone,
+ uint64_t amount)
{
+ unsigned int i;
+ struct ttm_mem_zone *zone;
+
spin_lock(&glob->lock);
- glob->used_total_memory -= amount;
- if (!himem)
- glob->used_memory -= amount;
- wake_up_all(&glob->queue);
+ for (i = 0; i < glob->num_zones; ++i) {
+ zone = glob->zones[i];
+ if (single_zone && zone != single_zone)
+ continue;
+ zone->used_mem -= amount;
+ }
spin_unlock(&glob->lock);
}
+void ttm_mem_global_free(struct ttm_mem_global *glob,
+ uint64_t amount)
+{
+ return ttm_mem_global_free_zone(glob, NULL, amount);
+}
+
static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
- uint64_t amount, bool himem, bool reserve)
+ struct ttm_mem_zone *single_zone,
+ uint64_t amount, bool reserve)
{
uint64_t limit;
- uint64_t lomem_limit;
int ret = -ENOMEM;
+ unsigned int i;
+ struct ttm_mem_zone *zone;
spin_lock(&glob->lock);
+ for (i = 0; i < glob->num_zones; ++i) {
+ zone = glob->zones[i];
+ if (single_zone && zone != single_zone)
+ continue;
- 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;
+ limit = (capable(CAP_SYS_ADMIN)) ?
+ zone->emer_mem : zone->max_mem;
+
+ if (zone->used_mem > limit)
+ goto out_unlock;
}
- 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;
+ for (i = 0; i < glob->num_zones; ++i) {
+ zone = glob->zones[i];
+ if (single_zone && zone != single_zone)
+ continue;
+ zone->used_mem += amount;
+ }
}
+
ret = 0;
out_unlock:
spin_unlock(&glob->lock);
@@ -199,12 +480,17 @@
return ret;
}
-int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
- bool no_wait, bool interruptible, bool himem)
+
+static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
+ struct ttm_mem_zone *single_zone,
+ uint64_t memory,
+ bool no_wait, bool interruptible)
{
int count = TTM_MEMORY_ALLOC_RETRIES;
- while (unlikely(ttm_mem_global_reserve(glob, memory, himem, true)
+ while (unlikely(ttm_mem_global_reserve(glob,
+ single_zone,
+ memory, true)
!= 0)) {
if (no_wait)
return -ENOMEM;
@@ -216,6 +502,56 @@
return 0;
}
+int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
+ bool no_wait, bool interruptible)
+{
+ /**
+ * Normal allocations of kernel memory are registered in
+ * all zones.
+ */
+
+ return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait,
+ interruptible);
+}
+
+int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
+ struct page *page,
+ bool no_wait, bool interruptible)
+{
+
+ struct ttm_mem_zone *zone = NULL;
+
+ /**
+ * Page allocations may be registed in a single zone
+ * only if highmem or !dma32.
+ */
+
+#ifdef CONFIG_HIGHMEM
+ if (PageHighMem(page) && glob->zone_highmem != NULL)
+ zone = glob->zone_highmem;
+#else
+ if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
+ zone = glob->zone_kernel;
+#endif
+ return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait,
+ interruptible);
+}
+
+void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page)
+{
+ struct ttm_mem_zone *zone = NULL;
+
+#ifdef CONFIG_HIGHMEM
+ if (PageHighMem(page) && glob->zone_highmem != NULL)
+ zone = glob->zone_highmem;
+#else
+ if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
+ zone = glob->zone_kernel;
+#endif
+ ttm_mem_global_free_zone(glob, zone, PAGE_SIZE);
+}
+
+
size_t ttm_round_pot(size_t size)
{
if ((size & (size - 1)) == 0)