TTM during the transition to the new page allocator lost the ability
to constrain the allocations via the lower_mem_limit. The code has
been unused since the change:
256dd44bd897 ("drm/ttm: nuke old page allocator")
and there's no reason to keep it.
Fixes: 256dd44bd897 ("drm/ttm: nuke old page allocator")
Signed-off-by: Zack Rusin <zackr@xxxxxxxxxx>
Reviewed-by: Martin Krastev <krastevm@xxxxxxxxxx>
---
drivers/gpu/drm/vmwgfx/ttm_memory.c | 99 +----------------------------
drivers/gpu/drm/vmwgfx/ttm_memory.h | 6 +-
2 files changed, 2 insertions(+), 103 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/ttm_memory.c b/drivers/gpu/drm/vmwgfx/ttm_memory.c
index edd17c30d5a5..2ced4c06ca45 100644
--- a/drivers/gpu/drm/vmwgfx/ttm_memory.c
+++ b/drivers/gpu/drm/vmwgfx/ttm_memory.c
@@ -34,7 +34,6 @@
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/slab.h>
-#include <linux/swap.h>
#include <drm/drm_device.h>
#include <drm/drm_file.h>
@@ -173,69 +172,7 @@ static struct kobj_type ttm_mem_zone_kobj_type = {
.sysfs_ops = &ttm_mem_zone_ops,
.default_attrs = ttm_mem_zone_attrs,
};
-
-static struct attribute ttm_mem_global_lower_mem_limit = {
- .name = "lower_mem_limit",
- .mode = S_IRUGO | S_IWUSR
-};
-
-static ssize_t ttm_mem_global_show(struct kobject *kobj,
- struct attribute *attr,
- char *buffer)
-{
- struct ttm_mem_global *glob =
- container_of(kobj, struct ttm_mem_global, kobj);
- uint64_t val = 0;
-
- spin_lock(&glob->lock);
- val = glob->lower_mem_limit;
- spin_unlock(&glob->lock);
- /* convert from number of pages to KB */
- val <<= (PAGE_SHIFT - 10);
- return snprintf(buffer, PAGE_SIZE, "%llu\n",
- (unsigned long long) val);
-}
-
-static ssize_t ttm_mem_global_store(struct kobject *kobj,
- struct attribute *attr,
- const char *buffer,
- size_t size)
-{
- int chars;
- uint64_t val64;
- unsigned long val;
- struct ttm_mem_global *glob =
- container_of(kobj, struct ttm_mem_global, kobj);
-
- chars = sscanf(buffer, "%lu", &val);
- if (chars == 0)
- return size;
-
- val64 = val;
- /* convert from KB to number of pages */
- val64 >>= (PAGE_SHIFT - 10);
-
- spin_lock(&glob->lock);
- glob->lower_mem_limit = val64;
- spin_unlock(&glob->lock);
-
- return size;
-}
-
-static struct attribute *ttm_mem_global_attrs[] = {
- &ttm_mem_global_lower_mem_limit,
- NULL
-};
-
-static const struct sysfs_ops ttm_mem_global_ops = {
- .show = &ttm_mem_global_show,
- .store = &ttm_mem_global_store,
-};
-
-static struct kobj_type ttm_mem_glob_kobj_type = {
- .sysfs_ops = &ttm_mem_global_ops,
- .default_attrs = ttm_mem_global_attrs,
-};
+static struct kobj_type ttm_mem_glob_kobj_type = {0};
static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
bool from_wq, uint64_t extra)
@@ -435,11 +372,6 @@ int ttm_mem_global_init(struct ttm_mem_global *glob, struct device *dev)
si_meminfo(&si);
- spin_lock(&glob->lock);
- /* set it as 0 by default to keep original behavior of OOM */
- glob->lower_mem_limit = 0;
- spin_unlock(&glob->lock);
-
ret = ttm_mem_init_kernel_zone(glob, &si);
if (unlikely(ret != 0))
goto out_no_zone;
@@ -527,35 +459,6 @@ void ttm_mem_global_free(struct ttm_mem_global *glob,
}
EXPORT_SYMBOL(ttm_mem_global_free);
-/*
- * check if the available mem is under lower memory limit
- *
- * a. if no swap disk at all or free swap space is under swap_mem_limit
- * but available system mem is bigger than sys_mem_limit, allow TTM
- * allocation;
- *
- * b. if the available system mem is less than sys_mem_limit but free
- * swap disk is bigger than swap_mem_limit, allow TTM allocation.
- */
-bool
-ttm_check_under_lowerlimit(struct ttm_mem_global *glob,
- uint64_t num_pages,
- struct ttm_operation_ctx *ctx)
-{
- int64_t available;
-
- /* We allow over commit during suspend */
- if (ctx->force_alloc)
- return false;
-
- available = get_nr_swap_pages() + si_mem_available();
- available -= num_pages;
- if (available < glob->lower_mem_limit)
- return true;
-
- return false;
-}
-
static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
struct ttm_mem_zone *single_zone,
uint64_t amount, bool reserve)
diff --git a/drivers/gpu/drm/vmwgfx/ttm_memory.h b/drivers/gpu/drm/vmwgfx/ttm_memory.h
index c50dba774485..7b0d617ebcb1 100644
--- a/drivers/gpu/drm/vmwgfx/ttm_memory.h
+++ b/drivers/gpu/drm/vmwgfx/ttm_memory.h
@@ -50,8 +50,6 @@
* @work: The workqueue callback for the shrink queue.
* @lock: Lock to protect the @shrink - and the memory accounting members,
* that is, essentially the whole structure with some exceptions.
- * @lower_mem_limit: include lower limit of swap space and lower limit of
- * system memory.
* @zones: Array of pointers to accounting zones.
* @num_zones: Number of populated entries in the @zones array.
* @zone_kernel: Pointer to the kernel zone.
@@ -69,7 +67,6 @@ extern struct ttm_mem_global {
struct workqueue_struct *swap_queue;
struct work_struct work;
spinlock_t lock;
- uint64_t lower_mem_limit;
struct ttm_mem_zone *zones[TTM_MEM_MAX_ZONES];
unsigned int num_zones;
struct ttm_mem_zone *zone_kernel;
@@ -91,6 +88,5 @@ int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
void ttm_mem_global_free_page(struct ttm_mem_global *glob,
struct page *page, uint64_t size);
size_t ttm_round_pot(size_t size);
-bool ttm_check_under_lowerlimit(struct ttm_mem_global *glob, uint64_t num_pages,
- struct ttm_operation_ctx *ctx);
+
#endif
--
2.32.0
