linux_dsm_epyc7002/drivers/gpu/drm/sis/sis_mm.c
Daniel Vetter 95c081c17f drm: Move master pointer from drm_minor to drm_device
There can only be one current master, and it's for the overall device.
Render/control minors don't support master-based auth at all.

This simplifies the master logic a lot, at least in my eyes: All these
additional pointer chases are just confusing.

While doing the conversion I spotted some locking fail:
- drm_lock/drm_auth check dev->master without holding the
  master_mutex. This is fallout from

  commit c996fd0b95
  Author: Thomas Hellstrom <thellstrom@vmware.com>
  Date:   Tue Feb 25 19:57:44 2014 +0100

      drm: Protect the master management with a drm_device::master_mutex v3

  but I honestly don't care one bit about those old legacy drivers
  using this.

- debugfs name info should just grab master_mutex.

- And the fbdev helper looked at it to figure out whether someone is
  using KMS. We just need a consistent value, so READ_ONCE. Aside: We
  should probably check if anyone has opened a control node too, but I
  guess current userspace doesn't really do that yet.

v2: Balance locking, reported by Julia.

v3: Rebase on top of Chris' oops fixes.

Cc: Julia Lawall <julia.lawall@lip6.fr>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> (v2)
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> (v2)
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1466499262-18717-1-git-send-email-daniel.vetter@ffwll.ch
2016-06-21 21:43:24 +02:00

363 lines
9.1 KiB
C

/**************************************************************************
*
* Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., 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.
*
*
**************************************************************************/
/*
* Authors:
* Thomas Hellström <thomas-at-tungstengraphics-dot-com>
*/
#include <drm/drmP.h>
#include <drm/sis_drm.h>
#include "sis_drv.h"
#include <video/sisfb.h>
#define VIDEO_TYPE 0
#define AGP_TYPE 1
struct sis_memblock {
struct drm_mm_node mm_node;
struct sis_memreq req;
struct list_head owner_list;
};
#if defined(CONFIG_FB_SIS) || defined(CONFIG_FB_SIS_MODULE)
/* fb management via fb device */
#define SIS_MM_ALIGN_SHIFT 0
#define SIS_MM_ALIGN_MASK 0
#else /* CONFIG_FB_SIS[_MODULE] */
#define SIS_MM_ALIGN_SHIFT 4
#define SIS_MM_ALIGN_MASK ((1 << SIS_MM_ALIGN_SHIFT) - 1)
#endif /* CONFIG_FB_SIS[_MODULE] */
static int sis_fb_init(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
drm_sis_private_t *dev_priv = dev->dev_private;
drm_sis_fb_t *fb = data;
mutex_lock(&dev->struct_mutex);
/* Unconditionally init the drm_mm, even though we don't use it when the
* fb sis driver is available - make cleanup easier. */
drm_mm_init(&dev_priv->vram_mm, 0, fb->size >> SIS_MM_ALIGN_SHIFT);
dev_priv->vram_initialized = 1;
dev_priv->vram_offset = fb->offset;
mutex_unlock(&dev->struct_mutex);
DRM_DEBUG("offset = %lu, size = %lu\n", fb->offset, fb->size);
return 0;
}
static int sis_drm_alloc(struct drm_device *dev, struct drm_file *file,
void *data, int pool)
{
drm_sis_private_t *dev_priv = dev->dev_private;
drm_sis_mem_t *mem = data;
int retval = 0, user_key;
struct sis_memblock *item;
struct sis_file_private *file_priv = file->driver_priv;
unsigned long offset;
mutex_lock(&dev->struct_mutex);
if (0 == ((pool == 0) ? dev_priv->vram_initialized :
dev_priv->agp_initialized)) {
DRM_ERROR
("Attempt to allocate from uninitialized memory manager.\n");
mutex_unlock(&dev->struct_mutex);
return -EINVAL;
}
item = kzalloc(sizeof(*item), GFP_KERNEL);
if (!item) {
retval = -ENOMEM;
goto fail_alloc;
}
mem->size = (mem->size + SIS_MM_ALIGN_MASK) >> SIS_MM_ALIGN_SHIFT;
if (pool == AGP_TYPE) {
retval = drm_mm_insert_node(&dev_priv->agp_mm,
&item->mm_node,
mem->size, 0,
DRM_MM_SEARCH_DEFAULT);
offset = item->mm_node.start;
} else {
#if defined(CONFIG_FB_SIS) || defined(CONFIG_FB_SIS_MODULE)
item->req.size = mem->size;
sis_malloc(&item->req);
if (item->req.size == 0)
retval = -ENOMEM;
offset = item->req.offset;
#else
retval = drm_mm_insert_node(&dev_priv->vram_mm,
&item->mm_node,
mem->size, 0,
DRM_MM_SEARCH_DEFAULT);
offset = item->mm_node.start;
#endif
}
if (retval)
goto fail_alloc;
retval = idr_alloc(&dev_priv->object_idr, item, 1, 0, GFP_KERNEL);
if (retval < 0)
goto fail_idr;
user_key = retval;
list_add(&item->owner_list, &file_priv->obj_list);
mutex_unlock(&dev->struct_mutex);
mem->offset = ((pool == 0) ?
dev_priv->vram_offset : dev_priv->agp_offset) +
(offset << SIS_MM_ALIGN_SHIFT);
mem->free = user_key;
mem->size = mem->size << SIS_MM_ALIGN_SHIFT;
return 0;
fail_idr:
drm_mm_remove_node(&item->mm_node);
fail_alloc:
kfree(item);
mutex_unlock(&dev->struct_mutex);
mem->offset = 0;
mem->size = 0;
mem->free = 0;
DRM_DEBUG("alloc %d, size = %ld, offset = %ld\n", pool, mem->size,
mem->offset);
return retval;
}
static int sis_drm_free(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
drm_sis_private_t *dev_priv = dev->dev_private;
drm_sis_mem_t *mem = data;
struct sis_memblock *obj;
mutex_lock(&dev->struct_mutex);
obj = idr_find(&dev_priv->object_idr, mem->free);
if (obj == NULL) {
mutex_unlock(&dev->struct_mutex);
return -EINVAL;
}
idr_remove(&dev_priv->object_idr, mem->free);
list_del(&obj->owner_list);
if (drm_mm_node_allocated(&obj->mm_node))
drm_mm_remove_node(&obj->mm_node);
#if defined(CONFIG_FB_SIS) || defined(CONFIG_FB_SIS_MODULE)
else
sis_free(obj->req.offset);
#endif
kfree(obj);
mutex_unlock(&dev->struct_mutex);
DRM_DEBUG("free = 0x%lx\n", mem->free);
return 0;
}
static int sis_fb_alloc(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
return sis_drm_alloc(dev, file_priv, data, VIDEO_TYPE);
}
static int sis_ioctl_agp_init(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_sis_private_t *dev_priv = dev->dev_private;
drm_sis_agp_t *agp = data;
dev_priv = dev->dev_private;
mutex_lock(&dev->struct_mutex);
drm_mm_init(&dev_priv->agp_mm, 0, agp->size >> SIS_MM_ALIGN_SHIFT);
dev_priv->agp_initialized = 1;
dev_priv->agp_offset = agp->offset;
mutex_unlock(&dev->struct_mutex);
DRM_DEBUG("offset = %lu, size = %lu\n", agp->offset, agp->size);
return 0;
}
static int sis_ioctl_agp_alloc(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
return sis_drm_alloc(dev, file_priv, data, AGP_TYPE);
}
static drm_local_map_t *sis_reg_init(struct drm_device *dev)
{
struct drm_map_list *entry;
drm_local_map_t *map;
list_for_each_entry(entry, &dev->maplist, head) {
map = entry->map;
if (!map)
continue;
if (map->type == _DRM_REGISTERS)
return map;
}
return NULL;
}
int sis_idle(struct drm_device *dev)
{
drm_sis_private_t *dev_priv = dev->dev_private;
uint32_t idle_reg;
unsigned long end;
int i;
if (dev_priv->idle_fault)
return 0;
if (dev_priv->mmio == NULL) {
dev_priv->mmio = sis_reg_init(dev);
if (dev_priv->mmio == NULL) {
DRM_ERROR("Could not find register map.\n");
return 0;
}
}
/*
* Implement a device switch here if needed
*/
if (dev_priv->chipset != SIS_CHIP_315)
return 0;
/*
* Timeout after 3 seconds. We cannot use DRM_WAIT_ON here
* because its polling frequency is too low.
*/
end = jiffies + (HZ * 3);
for (i = 0; i < 4; ++i) {
do {
idle_reg = SIS_READ(0x85cc);
} while (!time_after_eq(jiffies, end) &&
((idle_reg & 0x80000000) != 0x80000000));
}
if (time_after_eq(jiffies, end)) {
DRM_ERROR("Graphics engine idle timeout. "
"Disabling idle check\n");
dev_priv->idle_fault = 1;
}
/*
* The caller never sees an error code. It gets trapped
* in libdrm.
*/
return 0;
}
void sis_lastclose(struct drm_device *dev)
{
drm_sis_private_t *dev_priv = dev->dev_private;
if (!dev_priv)
return;
mutex_lock(&dev->struct_mutex);
if (dev_priv->vram_initialized) {
drm_mm_takedown(&dev_priv->vram_mm);
dev_priv->vram_initialized = 0;
}
if (dev_priv->agp_initialized) {
drm_mm_takedown(&dev_priv->agp_mm);
dev_priv->agp_initialized = 0;
}
dev_priv->mmio = NULL;
mutex_unlock(&dev->struct_mutex);
}
void sis_reclaim_buffers_locked(struct drm_device *dev,
struct drm_file *file)
{
struct sis_file_private *file_priv = file->driver_priv;
struct sis_memblock *entry, *next;
if (!(dev->master && file->master->lock.hw_lock))
return;
drm_legacy_idlelock_take(&file->master->lock);
mutex_lock(&dev->struct_mutex);
if (list_empty(&file_priv->obj_list)) {
mutex_unlock(&dev->struct_mutex);
drm_legacy_idlelock_release(&file->master->lock);
return;
}
sis_idle(dev);
list_for_each_entry_safe(entry, next, &file_priv->obj_list,
owner_list) {
list_del(&entry->owner_list);
if (drm_mm_node_allocated(&entry->mm_node))
drm_mm_remove_node(&entry->mm_node);
#if defined(CONFIG_FB_SIS) || defined(CONFIG_FB_SIS_MODULE)
else
sis_free(entry->req.offset);
#endif
kfree(entry);
}
mutex_unlock(&dev->struct_mutex);
drm_legacy_idlelock_release(&file->master->lock);
return;
}
const struct drm_ioctl_desc sis_ioctls[] = {
DRM_IOCTL_DEF_DRV(SIS_FB_ALLOC, sis_fb_alloc, DRM_AUTH),
DRM_IOCTL_DEF_DRV(SIS_FB_FREE, sis_drm_free, DRM_AUTH),
DRM_IOCTL_DEF_DRV(SIS_AGP_INIT, sis_ioctl_agp_init, DRM_AUTH | DRM_MASTER | DRM_ROOT_ONLY),
DRM_IOCTL_DEF_DRV(SIS_AGP_ALLOC, sis_ioctl_agp_alloc, DRM_AUTH),
DRM_IOCTL_DEF_DRV(SIS_AGP_FREE, sis_drm_free, DRM_AUTH),
DRM_IOCTL_DEF_DRV(SIS_FB_INIT, sis_fb_init, DRM_AUTH | DRM_MASTER | DRM_ROOT_ONLY),
};
int sis_max_ioctl = ARRAY_SIZE(sis_ioctls);