kernel/drivers/net/ethernet/intel/i40e/i40e_hmc.c

   1 /*******************************************************************************
   2  *
   3  * Intel Ethernet Controller XL710 Family Linux Driver
   4  * Copyright(c) 2013 - 2014 Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  *
  18  * The full GNU General Public License is included in this distribution in
  19  * the file called "COPYING".
  20  *
  21  * Contact Information:
  22  * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  ******************************************************************************/
  26
  27 #include "i40e_osdep.h"
  28 #include "i40e_register.h"
  29 #include "i40e_status.h"
  30 #include "i40e_alloc.h"
  31 #include "i40e_hmc.h"
  32 #include "i40e_type.h"
  33
  34 /**
  35  * i40e_add_sd_table_entry - Adds a segment descriptor to the table
  36  * @hw: pointer to our hw struct
  37  * @hmc_info: pointer to the HMC configuration information struct
  38  * @sd_index: segment descriptor index to manipulate
  39  * @type: what type of segment descriptor we're manipulating
  40  * @direct_mode_sz: size to alloc in direct mode
  41  **/
  42 i40e_status i40e_add_sd_table_entry(struct i40e_hw *hw,
  43                                               struct i40e_hmc_info *hmc_info,
  44                                               u32 sd_index,
  45                                               enum i40e_sd_entry_type type,
  46                                               u64 direct_mode_sz)
  47 {
  48         enum i40e_memory_type mem_type __attribute__((unused));
  49         struct i40e_hmc_sd_entry *sd_entry;
  50         bool dma_mem_alloc_done = false;
  51         struct i40e_dma_mem mem;
  52         i40e_status ret_code;
  53         u64 alloc_len;
  54
  55         if (NULL == hmc_info->sd_table.sd_entry) {
  56                 ret_code = I40E_ERR_BAD_PTR;
  57                 hw_dbg(hw, "i40e_add_sd_table_entry: bad sd_entry\n");
  58                 goto exit;
  59         }
  60
  61         if (sd_index >= hmc_info->sd_table.sd_cnt) {
  62                 ret_code = I40E_ERR_INVALID_SD_INDEX;
  63                 hw_dbg(hw, "i40e_add_sd_table_entry: bad sd_index\n");
  64                 goto exit;
  65         }
  66
  67         sd_entry = &hmc_info->sd_table.sd_entry[sd_index];
  68         if (!sd_entry->valid) {
  69                 if (I40E_SD_TYPE_PAGED == type) {
  70                         mem_type = i40e_mem_pd;
  71                         alloc_len = I40E_HMC_PAGED_BP_SIZE;
  72                 } else {
  73                         mem_type = i40e_mem_bp_jumbo;
  74                         alloc_len = direct_mode_sz;
  75                 }
  76
  77                 /* allocate a 4K pd page or 2M backing page */
  78                 ret_code = i40e_allocate_dma_mem(hw, &mem, mem_type, alloc_len,
  79                                                  I40E_HMC_PD_BP_BUF_ALIGNMENT);
  80                 if (ret_code)
  81                         goto exit;
  82                 dma_mem_alloc_done = true;
  83                 if (I40E_SD_TYPE_PAGED == type) {
  84                         ret_code = i40e_allocate_virt_mem(hw,
  85                                         &sd_entry->u.pd_table.pd_entry_virt_mem,
  86                                         sizeof(struct i40e_hmc_pd_entry) * 512);
  87                         if (ret_code)
  88                                 goto exit;
  89                         sd_entry->u.pd_table.pd_entry =
  90                                 (struct i40e_hmc_pd_entry *)
  91                                 sd_entry->u.pd_table.pd_entry_virt_mem.va;
  92                         sd_entry->u.pd_table.pd_page_addr = mem;
  93                 } else {
  94                         sd_entry->u.bp.addr = mem;
  95                         sd_entry->u.bp.sd_pd_index = sd_index;
  96                 }
  97                 /* initialize the sd entry */
  98                 hmc_info->sd_table.sd_entry[sd_index].entry_type = type;
  99
 100                 /* increment the ref count */
 101                 I40E_INC_SD_REFCNT(&hmc_info->sd_table);
 102         }
 103         /* Increment backing page reference count */
 104         if (I40E_SD_TYPE_DIRECT == sd_entry->entry_type)
 105                 I40E_INC_BP_REFCNT(&sd_entry->u.bp);
 106 exit:
 107         if (ret_code)
 108                 if (dma_mem_alloc_done)
 109                         i40e_free_dma_mem(hw, &mem);
 110
 111         return ret_code;
 112 }
 113
 114 /**
 115  * i40e_add_pd_table_entry - Adds page descriptor to the specified table
 116  * @hw: pointer to our HW structure
 117  * @hmc_info: pointer to the HMC configuration information structure
 118  * @pd_index: which page descriptor index to manipulate
 119  *
 120  * This function:
 121  *      1. Initializes the pd entry
 122  *      2. Adds pd_entry in the pd_table
 123  *      3. Mark the entry valid in i40e_hmc_pd_entry structure
 124  *      4. Initializes the pd_entry's ref count to 1
 125  * assumptions:
 126  *      1. The memory for pd should be pinned down, physically contiguous and
 127  *         aligned on 4K boundary and zeroed memory.
 128  *      2. It should be 4K in size.
 129  **/
 130 i40e_status i40e_add_pd_table_entry(struct i40e_hw *hw,
 131                                               struct i40e_hmc_info *hmc_info,
 132                                               u32 pd_index)
 133 {
 134         i40e_status ret_code = 0;
 135         struct i40e_hmc_pd_table *pd_table;
 136         struct i40e_hmc_pd_entry *pd_entry;
 137         struct i40e_dma_mem mem;
 138         u32 sd_idx, rel_pd_idx;
 139         u64 *pd_addr;
 140         u64 page_desc;
 141
 142         if (pd_index / I40E_HMC_PD_CNT_IN_SD >= hmc_info->sd_table.sd_cnt) {
 143                 ret_code = I40E_ERR_INVALID_PAGE_DESC_INDEX;
 144                 hw_dbg(hw, "i40e_add_pd_table_entry: bad pd_index\n");
 145                 goto exit;
 146         }
 147
 148         /* find corresponding sd */
 149         sd_idx = (pd_index / I40E_HMC_PD_CNT_IN_SD);
 150         if (I40E_SD_TYPE_PAGED !=
 151             hmc_info->sd_table.sd_entry[sd_idx].entry_type)
 152                 goto exit;
 153
 154         rel_pd_idx = (pd_index % I40E_HMC_PD_CNT_IN_SD);
 155         pd_table = &hmc_info->sd_table.sd_entry[sd_idx].u.pd_table;
 156         pd_entry = &pd_table->pd_entry[rel_pd_idx];
 157         if (!pd_entry->valid) {
 158                 /* allocate a 4K backing page */
 159                 ret_code = i40e_allocate_dma_mem(hw, &mem, i40e_mem_bp,
 160                                                  I40E_HMC_PAGED_BP_SIZE,
 161                                                  I40E_HMC_PD_BP_BUF_ALIGNMENT);
 162                 if (ret_code)
 163                         goto exit;
 164
 165                 pd_entry->bp.addr = mem;
 166                 pd_entry->bp.sd_pd_index = pd_index;
 167                 pd_entry->bp.entry_type = I40E_SD_TYPE_PAGED;
 168                 /* Set page address and valid bit */
 169                 page_desc = mem.pa | 0x1;
 170
 171                 pd_addr = (u64 *)pd_table->pd_page_addr.va;
 172                 pd_addr += rel_pd_idx;
 173
 174                 /* Add the backing page physical address in the pd entry */
 175                 memcpy(pd_addr, &page_desc, sizeof(u64));
 176
 177                 pd_entry->sd_index = sd_idx;
 178                 pd_entry->valid = true;
 179                 I40E_INC_PD_REFCNT(pd_table);
 180         }
 181         I40E_INC_BP_REFCNT(&pd_entry->bp);
 182 exit:
 183         return ret_code;
 184 }
 185
 186 /**
 187  * i40e_remove_pd_bp - remove a backing page from a page descriptor
 188  * @hw: pointer to our HW structure
 189  * @hmc_info: pointer to the HMC configuration information structure
 190  * @idx: the page index
 191  * @is_pf: distinguishes a VF from a PF
 192  *
 193  * This function:
 194  *      1. Marks the entry in pd tabe (for paged address mode) or in sd table
 195  *         (for direct address mode) invalid.
 196  *      2. Write to register PMPDINV to invalidate the backing page in FV cache
 197  *      3. Decrement the ref count for the pd _entry
 198  * assumptions:
 199  *      1. Caller can deallocate the memory used by backing storage after this
 200  *         function returns.
 201  **/
 202 i40e_status i40e_remove_pd_bp(struct i40e_hw *hw,
 203                                         struct i40e_hmc_info *hmc_info,
 204                                         u32 idx)
 205 {
 206         i40e_status ret_code = 0;
 207         struct i40e_hmc_pd_entry *pd_entry;
 208         struct i40e_hmc_pd_table *pd_table;
 209         struct i40e_hmc_sd_entry *sd_entry;
 210         u32 sd_idx, rel_pd_idx;
 211         u64 *pd_addr;
 212
 213         /* calculate index */
 214         sd_idx = idx / I40E_HMC_PD_CNT_IN_SD;
 215         rel_pd_idx = idx % I40E_HMC_PD_CNT_IN_SD;
 216         if (sd_idx >= hmc_info->sd_table.sd_cnt) {
 217                 ret_code = I40E_ERR_INVALID_PAGE_DESC_INDEX;
 218                 hw_dbg(hw, "i40e_remove_pd_bp: bad idx\n");
 219                 goto exit;
 220         }
 221         sd_entry = &hmc_info->sd_table.sd_entry[sd_idx];
 222         if (I40E_SD_TYPE_PAGED != sd_entry->entry_type) {
 223                 ret_code = I40E_ERR_INVALID_SD_TYPE;
 224                 hw_dbg(hw, "i40e_remove_pd_bp: wrong sd_entry type\n");
 225                 goto exit;
 226         }
 227         /* get the entry and decrease its ref counter */
 228         pd_table = &hmc_info->sd_table.sd_entry[sd_idx].u.pd_table;
 229         pd_entry = &pd_table->pd_entry[rel_pd_idx];
 230         I40E_DEC_BP_REFCNT(&pd_entry->bp);
 231         if (pd_entry->bp.ref_cnt)
 232                 goto exit;
 233
 234         /* mark the entry invalid */
 235         pd_entry->valid = false;
 236         I40E_DEC_PD_REFCNT(pd_table);
 237         pd_addr = (u64 *)pd_table->pd_page_addr.va;
 238         pd_addr += rel_pd_idx;
 239         memset(pd_addr, 0, sizeof(u64));
 240         I40E_INVALIDATE_PF_HMC_PD(hw, sd_idx, idx);
 241
 242         /* free memory here */
 243         ret_code = i40e_free_dma_mem(hw, &(pd_entry->bp.addr));
 244         if (ret_code)
 245                 goto exit;
 246         if (!pd_table->ref_cnt)
 247                 i40e_free_virt_mem(hw, &pd_table->pd_entry_virt_mem);
 248 exit:
 249         return ret_code;
 250 }
 251
 252 /**
 253  * i40e_prep_remove_sd_bp - Prepares to remove a backing page from a sd entry
 254  * @hmc_info: pointer to the HMC configuration information structure
 255  * @idx: the page index
 256  **/
 257 i40e_status i40e_prep_remove_sd_bp(struct i40e_hmc_info *hmc_info,
 258                                              u32 idx)
 259 {
 260         i40e_status ret_code = 0;
 261         struct i40e_hmc_sd_entry *sd_entry;
 262
 263         /* get the entry and decrease its ref counter */
 264         sd_entry = &hmc_info->sd_table.sd_entry[idx];
 265         I40E_DEC_BP_REFCNT(&sd_entry->u.bp);
 266         if (sd_entry->u.bp.ref_cnt) {
 267                 ret_code = I40E_ERR_NOT_READY;
 268                 goto exit;
 269         }
 270         I40E_DEC_SD_REFCNT(&hmc_info->sd_table);
 271
 272         /* mark the entry invalid */
 273         sd_entry->valid = false;
 274 exit:
 275         return ret_code;
 276 }
 277
 278 /**
 279  * i40e_remove_sd_bp_new - Removes a backing page from a segment descriptor
 280  * @hw: pointer to our hw struct
 281  * @hmc_info: pointer to the HMC configuration information structure
 282  * @idx: the page index
 283  * @is_pf: used to distinguish between VF and PF
 284  **/
 285 i40e_status i40e_remove_sd_bp_new(struct i40e_hw *hw,
 286                                             struct i40e_hmc_info *hmc_info,
 287                                             u32 idx, bool is_pf)
 288 {
 289         struct i40e_hmc_sd_entry *sd_entry;
 290         i40e_status ret_code = 0;
 291
 292         /* get the entry and decrease its ref counter */
 293         sd_entry = &hmc_info->sd_table.sd_entry[idx];
 294         if (is_pf) {
 295                 I40E_CLEAR_PF_SD_ENTRY(hw, idx, I40E_SD_TYPE_DIRECT);
 296         } else {
 297                 ret_code = I40E_NOT_SUPPORTED;
 298                 goto exit;
 299         }
 300         ret_code = i40e_free_dma_mem(hw, &(sd_entry->u.bp.addr));
 301         if (ret_code)
 302                 goto exit;
 303 exit:
 304         return ret_code;
 305 }
 306
 307 /**
 308  * i40e_prep_remove_pd_page - Prepares to remove a PD page from sd entry.
 309  * @hmc_info: pointer to the HMC configuration information structure
 310  * @idx: segment descriptor index to find the relevant page descriptor
 311  **/
 312 i40e_status i40e_prep_remove_pd_page(struct i40e_hmc_info *hmc_info,
 313                                                u32 idx)
 314 {
 315         i40e_status ret_code = 0;
 316         struct i40e_hmc_sd_entry *sd_entry;
 317
 318         sd_entry = &hmc_info->sd_table.sd_entry[idx];
 319
 320         if (sd_entry->u.pd_table.ref_cnt) {
 321                 ret_code = I40E_ERR_NOT_READY;
 322                 goto exit;
 323         }
 324
 325         /* mark the entry invalid */
 326         sd_entry->valid = false;
 327
 328         I40E_DEC_SD_REFCNT(&hmc_info->sd_table);
 329 exit:
 330         return ret_code;
 331 }
 332
 333 /**
 334  * i40e_remove_pd_page_new - Removes a PD page from sd entry.
 335  * @hw: pointer to our hw struct
 336  * @hmc_info: pointer to the HMC configuration information structure
 337  * @idx: segment descriptor index to find the relevant page descriptor
 338  * @is_pf: used to distinguish between VF and PF
 339  **/
 340 i40e_status i40e_remove_pd_page_new(struct i40e_hw *hw,
 341                                               struct i40e_hmc_info *hmc_info,
 342                                               u32 idx, bool is_pf)
 343 {
 344         i40e_status ret_code = 0;
 345         struct i40e_hmc_sd_entry *sd_entry;
 346
 347         sd_entry = &hmc_info->sd_table.sd_entry[idx];
 348         if (is_pf) {
 349                 I40E_CLEAR_PF_SD_ENTRY(hw, idx, I40E_SD_TYPE_PAGED);
 350         } else {
 351                 ret_code = I40E_NOT_SUPPORTED;
 352                 goto exit;
 353         }
 354         /* free memory here */
 355         ret_code = i40e_free_dma_mem(hw, &(sd_entry->u.pd_table.pd_page_addr));
 356         if (ret_code)
 357                 goto exit;
 358 exit:
 359         return ret_code;
 360 }