Initial commit
Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>
This commit is contained in:
Robert Baldyga
210
modules/cas_cache/main.c
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210
modules/cas_cache/main.c
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@@ -0,0 +1,210 @@
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/*
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* Copyright(c) 2012-2019 Intel Corporation
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* SPDX-License-Identifier: BSD-3-Clause-Clear
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*/
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#include "cas_cache.h"
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/* Layer information. */
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MODULE_AUTHOR("Intel(R) Corporation");
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_VERSION(CAS_VERSION);
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u32 max_writeback_queue_size = 65536;
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module_param(max_writeback_queue_size, uint, (S_IRUSR | S_IRGRP));
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MODULE_PARM_DESC(max_writeback_queue_size,
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"Max cache writeback queue size (65536)");
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u32 writeback_queue_unblock_size = 60000;
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module_param(writeback_queue_unblock_size, uint, (S_IRUSR | S_IRGRP));
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MODULE_PARM_DESC(writeback_queue_unblock_size,
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"Cache writeback queue size (60000) at which queue "
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"is unblocked when blocked");
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u32 dry_run;
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module_param(dry_run, uint, (S_IRUSR | S_IRGRP));
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MODULE_PARM_DESC(dry_run, "Perform dry run on module load");
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u32 use_io_scheduler = 1;
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module_param(use_io_scheduler, uint, (S_IRUSR | S_IRGRP));
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MODULE_PARM_DESC(use_io_scheduler,
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"Configure how IO shall be handled. "
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"0 - in make request function, 1 - in request function");
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u32 metadata_layout = ocf_metadata_layout_default;
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module_param(metadata_layout, uint, (S_IRUSR | S_IRGRP));
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MODULE_PARM_DESC(metadata_layout, "Metadata layout, 0 - striping, 1 - sequential");
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u32 unaligned_io = 1;
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module_param(unaligned_io, uint, (S_IRUSR | S_IRGRP));
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MODULE_PARM_DESC(unaligned_io,
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"Define how to handle I/O requests unaligned to 4 kiB, "
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"0 - apply PT, 1 - handle by cache");
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u32 seq_cut_off_mb = 1;
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module_param(seq_cut_off_mb, uint, (S_IRUSR | S_IRGRP));
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MODULE_PARM_DESC(seq_cut_off_mb,
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"Sequential cut off threshold in MiB. 0 - disable");
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/* globals */
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bool in_upgrade;
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ocf_ctx_t cas_ctx;
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struct casdsk_functions_mapper casdisk_functions;
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struct exported_symbol {
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char *name;
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unsigned long addr;
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};
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int static cas_find_symbol(void *data, const char *namebuf,
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struct module *module, unsigned long kallsyms_addresses)
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{
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struct exported_symbol *sym = data;
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if (strcmp(namebuf, sym->name) == 0)
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sym->addr = kallsyms_addresses;
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return 0;
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}
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#define cas_lookup_symbol(f) ({ \
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struct exported_symbol sym = {#f, 0}; \
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kallsyms_on_each_symbol(&cas_find_symbol, &sym); \
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casdisk_functions.f = (void *)sym.addr; \
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if (!casdisk_functions.f) \
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return -EINVAL; \
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})
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int static cas_casdisk_lookup_funtions(void)
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{
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cas_lookup_symbol(casdsk_disk_dettach);
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cas_lookup_symbol(casdsk_exp_obj_destroy);
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cas_lookup_symbol(casdsk_exp_obj_create);
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cas_lookup_symbol(casdsk_disk_get_queue);
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cas_lookup_symbol(casdsk_store_config);
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cas_lookup_symbol(casdsk_disk_get_blkdev);
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cas_lookup_symbol(casdsk_exp_obj_get_queue);
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cas_lookup_symbol(casdsk_get_version);
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cas_lookup_symbol(casdsk_disk_close);
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cas_lookup_symbol(casdsk_disk_claim);
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cas_lookup_symbol(casdsk_exp_obj_unlock);
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cas_lookup_symbol(casdsk_disk_set_pt);
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cas_lookup_symbol(casdsk_get_stored_config);
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cas_lookup_symbol(casdsk_disk_get_gendisk);
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cas_lookup_symbol(casdsk_disk_attach);
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cas_lookup_symbol(casdsk_disk_set_attached);
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cas_lookup_symbol(casdsk_exp_obj_activate);
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cas_lookup_symbol(casdsk_exp_obj_activated);
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cas_lookup_symbol(casdsk_exp_obj_lock);
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cas_lookup_symbol(casdsk_free_stored_config);
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cas_lookup_symbol(casdsk_disk_open);
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cas_lookup_symbol(casdsk_disk_clear_pt);
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cas_lookup_symbol(casdsk_exp_obj_get_gendisk);
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return 0;
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}
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static int __init cas_init_module(void)
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{
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int result = 0;
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result = cas_casdisk_lookup_funtions();
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if (result) {
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printk(KERN_ERR OCF_PREFIX_SHORT
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"Could not find inteldisk functions.\n");
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return result;
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}
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if (casdisk_functions.casdsk_get_version() != CASDSK_IFACE_VERSION) {
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printk(KERN_ERR OCF_PREFIX_SHORT
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"Incompatible inteldisk module\n");
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return -EINVAL;
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}
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if (!writeback_queue_unblock_size || !max_writeback_queue_size) {
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printk(KERN_ERR OCF_PREFIX_SHORT
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"Invalid module parameter.\n");
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return -EINVAL;
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}
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if (writeback_queue_unblock_size >= max_writeback_queue_size) {
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printk(KERN_ERR OCF_PREFIX_SHORT
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"parameter writeback_queue_unblock_size"
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" must be less than max_writeback_queue_size\n");
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return -EINVAL;
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}
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if (metadata_layout >= ocf_metadata_layout_max) {
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printk(KERN_ERR OCF_PREFIX_SHORT
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"Invalid value for metadata_layout parameter\n");
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return -EINVAL;
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}
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if (unaligned_io != 0 && unaligned_io != 1) {
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printk(KERN_ERR OCF_PREFIX_SHORT
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"Invalid value for unaligned_io parameter\n");
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return -EINVAL;
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}
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if (use_io_scheduler != 0 && use_io_scheduler != 1) {
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printk(KERN_ERR OCF_PREFIX_SHORT
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"Invalid value for use_io_scheduler parameter\n");
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return -EINVAL;
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}
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result = cas_initialize_context();
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if (result) {
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printk(KERN_ERR OCF_PREFIX_SHORT
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"Cannot initialize cache library\n");
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return result;
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}
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result = cas_upgrade_get_configuration();
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if (-KCAS_ERR_NO_STORED_CONF == result) {
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printk(KERN_INFO OCF_PREFIX_SHORT
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"Not found configuration for upgrade. "
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"Standard module initialization.\n");
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} else {
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if (!dry_run) {
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result = cas_upgrade_finish();
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if (result) {
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printk(KERN_ERR OCF_PREFIX_SHORT
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"Error during finish upgrade, "
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"result: %d\n", result);
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goto error_cas_ctx_init;
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}
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} else {
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result = cas_upgrade_verify();
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if (result) {
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printk(KERN_ERR OCF_PREFIX_SHORT
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"Error during upgrade "
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"verification\n");
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goto error_cas_ctx_init;
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}
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}
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}
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result = cas_ctrl_device_init();
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if (result) {
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printk(KERN_ERR OCF_PREFIX_SHORT
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"Cannot initialize control device\n");
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goto error_cas_ctx_init;
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}
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printk(KERN_INFO "%s Version %s (%s)::Module loaded successfully\n",
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OCF_PREFIX_LONG, CAS_VERSION, CAS_KERNEL);
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return 0;
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error_cas_ctx_init:
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cas_cleanup_context();
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return result;
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}
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module_init(cas_init_module);
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static void __exit cas_exit_module(void)
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{
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cas_ctrl_device_deinit();
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cas_cleanup_context();
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}
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module_exit(cas_exit_module);
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