drivers/staging/media/atomisp/pci/atomisp2/css2400/memory_realloc.c

   1 /*
   2 Support for Intel Camera Imaging ISP subsystem.
   3 Copyright (c) 2010 - 2015, Intel Corporation.
   4
   5 This program is free software; you can redistribute it and/or modify it
   6 under the terms and conditions of the GNU General Public License,
   7 version 2, as published by the Free Software Foundation.
   8
   9 This program is distributed in the hope it will be useful, but WITHOUT
  10 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 more details.
  13 */
  14 #include "memory_realloc.h"
  15 #include "ia_css_debug.h"
  16 #include "ia_css_refcount.h"
  17 #include "memory_access.h"
  18
  19 static bool realloc_isp_css_mm_buf(
  20         hrt_vaddress *curr_buf,
  21         size_t *curr_size,
  22         size_t needed_size,
  23         bool force,
  24         enum ia_css_err *err,
  25         uint16_t mmgr_attribute);
  26
  27
  28 bool reallocate_buffer(
  29         hrt_vaddress *curr_buf,
  30         size_t *curr_size,
  31         size_t needed_size,
  32         bool force,
  33         enum ia_css_err *err)
  34 {
  35         bool ret;
  36         uint16_t        mmgr_attribute = MMGR_ATTRIBUTE_DEFAULT;
  37
  38         IA_CSS_ENTER_PRIVATE("void");
  39
  40         ret = realloc_isp_css_mm_buf(curr_buf,
  41                 curr_size, needed_size, force, err, mmgr_attribute);
  42
  43         IA_CSS_LEAVE_PRIVATE("ret=%d", ret);
  44         return ret;
  45 }
  46
  47 static bool realloc_isp_css_mm_buf(
  48         hrt_vaddress *curr_buf,
  49         size_t *curr_size,
  50         size_t needed_size,
  51         bool force,
  52         enum ia_css_err *err,
  53         uint16_t mmgr_attribute)
  54 {
  55         int32_t id;
  56
  57         *err = IA_CSS_SUCCESS;
  58         /* Possible optimization: add a function sh_css_isp_css_mm_realloc()
  59          * and implement on top of hmm. */
  60
  61         IA_CSS_ENTER_PRIVATE("void");
  62
  63         if (ia_css_refcount_is_single(*curr_buf) && !force && *curr_size >= needed_size) {
  64                 IA_CSS_LEAVE_PRIVATE("false");
  65                 return false;
  66         }
  67
  68         id = IA_CSS_REFCOUNT_PARAM_BUFFER;
  69         ia_css_refcount_decrement(id, *curr_buf);
  70         *curr_buf = ia_css_refcount_increment(id, mmgr_alloc_attr(needed_size,
  71                                                         mmgr_attribute));
  72
  73         if (!*curr_buf) {
  74                 *err = IA_CSS_ERR_CANNOT_ALLOCATE_MEMORY;
  75                 *curr_size = 0;
  76         } else {
  77                 *curr_size = needed_size;
  78         }
  79         IA_CSS_LEAVE_PRIVATE("true");
  80         return true;
  81 }