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Viewing changes to drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c

  • Committer: Bazaar Package Importer
  • Author(s): Ben Hutchings, Ben Hutchings, Aurelien Jarno, Martin Michlmayr
  • Date: 2011-04-06 13:53:30 UTC
  • mfrom: (43.1.5 sid)
  • Revision ID: james.westby@ubuntu.com-20110406135330-wjufxhd0tvn3zx4z
Tags: 2.6.38-3
http://bugs.debian.org/620124
http://bugs.debian.org/620284
http://bugs.debian.org/620204
[ Ben Hutchings ]
* [ppc64] Add to linux-tools package architectures (Closes: #620124)
* [amd64] Save cr4 to mmu_cr4_features at boot time (Closes: #620284)
* appletalk: Fix bugs introduced when removing use of BKL
* ALSA: Fix yet another race in disconnection
* cciss: Fix lost command issue
* ath9k: Fix kernel panic in AR2427
* ses: Avoid kernel panic when lun 0 is not mapped
* PCI/ACPI: Report ASPM support to BIOS if not disabled from command line

[ Aurelien Jarno ]
* rtlwifi: fix build when PCI is not enabled.

[ Martin Michlmayr ]
* rtlwifi: Eliminate udelay calls with too large values (Closes: #620204)

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drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
 
1
/**************************************************************************
 
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 *
 
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 * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
 
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 * All Rights Reserved.
 
5
 *
 
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 * Permission is hereby granted, free of charge, to any person obtaining a
 
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 * copy of this software and associated documentation files (the
 
8
 * "Software"), to deal in the Software without restriction, including
 
9
 * without limitation the rights to use, copy, modify, merge, publish,
 
10
 * distribute, sub license, and/or sell copies of the Software, and to
 
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 * permit persons to whom the Software is furnished to do so, subject to
 
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 * the following conditions:
 
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 *
 
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 * The above copyright notice and this permission notice (including the
 
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 * next paragraph) shall be included in all copies or substantial portions
 
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 * of the Software.
 
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 *
 
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 
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 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 
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 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 
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 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 
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 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 
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 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 
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 *
 
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 **************************************************************************/
 
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/*
 
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 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
 
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 */
 
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#include "vmwgfx_drv.h"
 
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#include "ttm/ttm_module.h"
 
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#include "ttm/ttm_bo_driver.h"
 
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#include "ttm/ttm_placement.h"
 
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#include <linux/idr.h>
 
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#include <linux/spinlock.h>
 
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#include <linux/kernel.h>
 
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struct vmwgfx_gmrid_man {
 
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        spinlock_t lock;
 
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        struct ida gmr_ida;
 
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        uint32_t max_gmr_ids;
 
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};
 
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static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
 
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                                  struct ttm_buffer_object *bo,
 
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                                  struct ttm_placement *placement,
 
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                                  struct ttm_mem_reg *mem)
 
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{
 
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        struct vmwgfx_gmrid_man *gman =
 
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                (struct vmwgfx_gmrid_man *)man->priv;
 
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        int ret;
 
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        int id;
 
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        mem->mm_node = NULL;
 
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        do {
 
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                if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0))
 
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                        return -ENOMEM;
 
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                spin_lock(&gman->lock);
 
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                ret = ida_get_new(&gman->gmr_ida, &id);
 
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                if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) {
 
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                        ida_remove(&gman->gmr_ida, id);
 
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                        spin_unlock(&gman->lock);
 
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                        return 0;
 
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                }
 
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                spin_unlock(&gman->lock);
 
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        } while (ret == -EAGAIN);
 
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        if (likely(ret == 0)) {
 
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                mem->mm_node = gman;
 
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                mem->start = id;
 
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        }
 
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        return ret;
 
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}
 
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static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
 
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                                   struct ttm_mem_reg *mem)
 
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{
 
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        struct vmwgfx_gmrid_man *gman =
 
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                (struct vmwgfx_gmrid_man *)man->priv;
 
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        if (mem->mm_node) {
 
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                spin_lock(&gman->lock);
 
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                ida_remove(&gman->gmr_ida, mem->start);
 
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                spin_unlock(&gman->lock);
 
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                mem->mm_node = NULL;
 
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        }
 
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}
 
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static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
 
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                              unsigned long p_size)
 
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{
 
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        struct vmwgfx_gmrid_man *gman =
 
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                kzalloc(sizeof(*gman), GFP_KERNEL);
 
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        if (unlikely(gman == NULL))
 
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                return -ENOMEM;
 
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        spin_lock_init(&gman->lock);
 
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        ida_init(&gman->gmr_ida);
 
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        gman->max_gmr_ids = p_size;
 
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        man->priv = (void *) gman;
 
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        return 0;
 
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}
 
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static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
 
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{
 
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        struct vmwgfx_gmrid_man *gman =
 
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                (struct vmwgfx_gmrid_man *)man->priv;
 
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        if (gman) {
 
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                ida_destroy(&gman->gmr_ida);
 
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                kfree(gman);
 
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        }
 
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        return 0;
 
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}
 
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static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
 
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                                const char *prefix)
 
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{
 
127
        printk(KERN_INFO "%s: No debug info available for the GMR "
 
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               "id manager.\n", prefix);
 
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}
 
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const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
 
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        vmw_gmrid_man_init,
 
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        vmw_gmrid_man_takedown,
 
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        vmw_gmrid_man_get_node,
 
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        vmw_gmrid_man_put_node,
 
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        vmw_gmrid_man_debug
 
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};