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conv_ftl.c
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conv_ftl.c
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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/ktime.h>
#include <linux/sched/clock.h>
#include "nvmev.h"
#include "conv_ftl.h"
void enqueue_writeback_io_req(int sqid, unsigned long long nsecs_target,
struct buffer *write_buffer, unsigned int buffs_to_release);
static inline bool last_pg_in_wordline(struct conv_ftl *conv_ftl, struct ppa *ppa)
{
struct ssdparams *spp = &conv_ftl->ssd->sp;
return (ppa->g.pg % spp->pgs_per_oneshotpg) == (spp->pgs_per_oneshotpg - 1);
}
static bool should_gc(struct conv_ftl *conv_ftl)
{
return (conv_ftl->lm.free_line_cnt <= conv_ftl->cp.gc_thres_lines);
}
static inline bool should_gc_high(struct conv_ftl *conv_ftl)
{
return conv_ftl->lm.free_line_cnt <= conv_ftl->cp.gc_thres_lines_high;
}
static inline struct ppa get_maptbl_ent(struct conv_ftl *conv_ftl, uint64_t lpn)
{
return conv_ftl->maptbl[lpn];
}
static inline void set_maptbl_ent(struct conv_ftl *conv_ftl, uint64_t lpn, struct ppa *ppa)
{
NVMEV_ASSERT(lpn < conv_ftl->ssd->sp.tt_pgs);
conv_ftl->maptbl[lpn] = *ppa;
}
static uint64_t ppa2pgidx(struct conv_ftl *conv_ftl, struct ppa *ppa)
{
struct ssdparams *spp = &conv_ftl->ssd->sp;
uint64_t pgidx;
NVMEV_DEBUG("ppa2pgidx: ch:%d, lun:%d, pl:%d, blk:%d, pg:%d\n", ppa->g.ch, ppa->g.lun,
ppa->g.pl, ppa->g.blk, ppa->g.pg);
pgidx = ppa->g.ch * spp->pgs_per_ch + ppa->g.lun * spp->pgs_per_lun +
ppa->g.pl * spp->pgs_per_pl + ppa->g.blk * spp->pgs_per_blk + ppa->g.pg;
NVMEV_ASSERT(pgidx < spp->tt_pgs);
return pgidx;
}
static inline uint64_t get_rmap_ent(struct conv_ftl *conv_ftl, struct ppa *ppa)
{
uint64_t pgidx = ppa2pgidx(conv_ftl, ppa);
return conv_ftl->rmap[pgidx];
}
/* set rmap[page_no(ppa)] -> lpn */
static inline void set_rmap_ent(struct conv_ftl *conv_ftl, uint64_t lpn, struct ppa *ppa)
{
uint64_t pgidx = ppa2pgidx(conv_ftl, ppa);
conv_ftl->rmap[pgidx] = lpn;
}
static inline int victim_line_cmp_pri(pqueue_pri_t next, pqueue_pri_t curr)
{
return (next > curr);
}
static inline pqueue_pri_t victim_line_get_pri(void *a)
{
return ((struct line *)a)->vpc;
}
static inline void victim_line_set_pri(void *a, pqueue_pri_t pri)
{
((struct line *)a)->vpc = pri;
}
static inline size_t victim_line_get_pos(void *a)
{
return ((struct line *)a)->pos;
}
static inline void victim_line_set_pos(void *a, size_t pos)
{
((struct line *)a)->pos = pos;
}
static inline void consume_write_credit(struct conv_ftl *conv_ftl)
{
conv_ftl->wfc.write_credits--;
}
static void forground_gc(struct conv_ftl *conv_ftl);
static inline void check_and_refill_write_credit(struct conv_ftl *conv_ftl)
{
struct write_flow_control *wfc = &(conv_ftl->wfc);
if (wfc->write_credits <= 0) {
forground_gc(conv_ftl);
wfc->write_credits += wfc->credits_to_refill;
}
}
static void init_lines(struct conv_ftl *conv_ftl)
{
struct ssdparams *spp = &conv_ftl->ssd->sp;
struct line_mgmt *lm = &conv_ftl->lm;
struct line *line;
int i;
lm->tt_lines = spp->blks_per_pl;
NVMEV_ASSERT(lm->tt_lines == spp->tt_lines);
lm->lines = vmalloc(sizeof(struct line) * lm->tt_lines);
INIT_LIST_HEAD(&lm->free_line_list);
INIT_LIST_HEAD(&lm->full_line_list);
lm->victim_line_pq = pqueue_init(spp->tt_lines, victim_line_cmp_pri, victim_line_get_pri,
victim_line_set_pri, victim_line_get_pos,
victim_line_set_pos);
lm->free_line_cnt = 0;
for (i = 0; i < lm->tt_lines; i++) {
lm->lines[i] = (struct line) {
.id = i,
.ipc = 0,
.vpc = 0,
.pos = 0,
.entry = LIST_HEAD_INIT(lm->lines[i].entry),
};
/* initialize all the lines as free lines */
list_add_tail(&lm->lines[i].entry, &lm->free_line_list);
lm->free_line_cnt++;
}
NVMEV_ASSERT(lm->free_line_cnt == lm->tt_lines);
lm->victim_line_cnt = 0;
lm->full_line_cnt = 0;
}
//66f1
static void init_lines_DA(struct conv_ftl *conv_ftl)
{
struct ssdparams *spp = &conv_ftl->ssd->sp;
uint32_t luncount = conv_ftl->ssd->sp.luns_per_ch * conv_ftl->ssd->sp.nchs;
uint32_t lun=0;
for( lun=0; lun < luncount; lun++ )
{
struct line_mgmt *lm = (conv_ftl->lunlm+lun);
struct line *line;
int i;
lm->tt_lines = spp->blks_per_pl;
NVMEV_ASSERT(lm->tt_lines == spp->tt_lines);
lm->lines = vmalloc(sizeof(struct line) * lm->tt_lines);
INIT_LIST_HEAD(&lm->free_line_list);
INIT_LIST_HEAD(&lm->full_line_list);
lm->victim_line_pq = pqueue_init(spp->tt_lines, victim_line_cmp_pri, victim_line_get_pri,
victim_line_set_pri, victim_line_get_pos,
victim_line_set_pos);
lm->free_line_cnt = 0;
for (i = 0; i < lm->tt_lines; i++) {
lm->lines[i] = (struct line) {
.id = i,
.ipc = 0,
.vpc = 0,
.pos = 0,
.entry = LIST_HEAD_INIT(lm->lines[i].entry),
};
/* initialize all the lines as free lines */
list_add_tail(&lm->lines[i].entry, &lm->free_line_list);
lm->free_line_cnt++;
}
NVMEV_ASSERT(lm->free_line_cnt == lm->tt_lines);
lm->victim_line_cnt = 0;
lm->full_line_cnt = 0;
}
}
//66f1
static void remove_lines(struct conv_ftl *conv_ftl)
{
pqueue_free(conv_ftl->lm.victim_line_pq);
vfree(conv_ftl->lm.lines);
}
static void remove_lines_DA(struct conv_ftl *conv_ftl)
{
uint32_t luncount = conv_ftl->ssd->sp.luns_per_ch * conv_ftl->ssd->sp.nchs;
uint32_t lun=0;
for( lun=0; lun < luncount; lun++ )
{
struct line_mgmt *lm = (conv_ftl->lunlm+lun);
pqueue_free(lm->victim_line_pq);
vfree(lm->lines);
}
}
static void init_write_flow_control(struct conv_ftl *conv_ftl)
{
struct write_flow_control *wfc = &(conv_ftl->wfc);
struct ssdparams *spp = &conv_ftl->ssd->sp;
wfc->write_credits = spp->pgs_per_line;
wfc->credits_to_refill = spp->pgs_per_line;
}
static inline void check_addr(int a, int max)
{
NVMEV_ASSERT(a >= 0 && a < max);
}
static struct line *get_next_free_line(struct conv_ftl *conv_ftl)
{
struct line_mgmt *lm = &conv_ftl->lm;
struct line *curline = list_first_entry_or_null(&lm->free_line_list, struct line, entry);
if (!curline) {
NVMEV_ERROR("No free line left in VIRT !!!!\n");
return NULL;
}
list_del_init(&curline->entry);
lm->free_line_cnt--;
NVMEV_DEBUG("[%s] free_line_cnt %d\n", __FUNCTION__, lm->free_line_cnt);
return curline;
}
//66f1
static struct line *get_next_free_line_DA(struct conv_ftl *conv_ftl, uint32_t lun)
{
struct line_mgmt *lm = conv_ftl->lunlm+lun;
struct line *curline = list_first_entry_or_null(&lm->free_line_list, struct line, entry);
if (!curline) {
NVMEV_ERROR("No free line left in VIRT !!!!\n");
return NULL;
}
list_del_init(&curline->entry);
lm->free_line_cnt--;
NVMEV_DEBUG("[%s] free_line_cnt %d\n", __FUNCTION__, lm->free_line_cnt);
return curline;
}
//66f1
static struct write_pointer *__get_wp(struct conv_ftl *ftl, uint32_t io_type)
{
if (io_type == USER_IO) {
return &ftl->wp;
} else if (io_type == GC_IO) {
return &ftl->gc_wp;
}
NVMEV_ASSERT(0);
return NULL;
}
//66f1
static struct write_pointer *__get_wp_DA(struct conv_ftl *ftl, uint32_t io_type, uint32_t lun)
{
if (io_type == USER_IO) {
return (ftl->lunwp+lun);
} else if (io_type == GC_IO) {
return &ftl->gc_wp;
}
NVMEV_ASSERT(0);
return NULL;
}
//66f1
static void prepare_write_pointer(struct conv_ftl *conv_ftl, uint32_t io_type)
{
struct write_pointer *wp = __get_wp(conv_ftl, io_type);
struct line *curline = get_next_free_line(conv_ftl);
NVMEV_ASSERT(wp);
NVMEV_ASSERT(curline);
/* wp->curline is always our next-to-write super-block */
*wp = (struct write_pointer) {
.curline = curline,
.ch = 0,
.lun = 0,
.pg = 0,
.blk = curline->id,
.pl = 0,
};
}
//66f1
static void prepare_write_pointer_DA(struct conv_ftl *conv_ftl, uint32_t io_type)
{
uint32_t luncount = conv_ftl->ssd->sp.luns_per_ch * conv_ftl->ssd->sp.nchs;
uint32_t lun=0;
for( lun=0; lun < luncount; lun++ )
{
struct line *curline = get_next_free_line_DA(conv_ftl, lun);
struct write_pointer *wp = __get_wp_DA(conv_ftl, io_type, lun);
uint32_t localch = lun % conv_ftl->ssd->sp.nchs;
uint32_t locallun = lun / conv_ftl->ssd->sp.nchs;
NVMEV_ASSERT(wp);
NVMEV_ASSERT(curline);
/* wp->curline is always our next-to-write super-block */
*wp = (struct write_pointer) {
.curline = curline,
.ch = localch,
.lun = locallun,
.pg = 0,
.blk = curline->id,
.pl = 0,
};
}
//debug wpp
for( lun=0; lun < luncount; lun++ )
{
struct write_pointer *wp = __get_wp_DA(conv_ftl, io_type, lun);
//NVMEV_ERROR("wpp lun:%d, ch: %d, lun: %d\n", lun, wp->ch, wp->lun);
}
}
//66f1
static void advance_write_pointer(struct conv_ftl *conv_ftl, uint32_t io_type)
{
struct ssdparams *spp = &conv_ftl->ssd->sp;
struct line_mgmt *lm = &conv_ftl->lm;
struct write_pointer *wpp = __get_wp(conv_ftl, io_type);
NVMEV_DEBUG("current wpp: ch:%d, lun:%d, pl:%d, blk:%d, pg:%d\n", wpp->ch, wpp->lun,
wpp->pl, wpp->blk, wpp->pg);
check_addr(wpp->pg, spp->pgs_per_blk);
wpp->pg++;
if ((wpp->pg % spp->pgs_per_oneshotpg) != 0)
goto out;
wpp->pg -= spp->pgs_per_oneshotpg;
check_addr(wpp->ch, spp->nchs);
wpp->ch++;
if (wpp->ch != spp->nchs)
goto out;
wpp->ch = 0;
check_addr(wpp->lun, spp->luns_per_ch);
wpp->lun++;
/* in this case, we should go to next lun */
if (wpp->lun != spp->luns_per_ch)
goto out;
wpp->lun = 0;
/* go to next wordline in the block */
wpp->pg += spp->pgs_per_oneshotpg;
if (wpp->pg != spp->pgs_per_blk)
goto out;
wpp->pg = 0;
/* move current line to {victim,full} line list */
if (wpp->curline->vpc == spp->pgs_per_line) {
/* all pgs are still valid, move to full line list */
NVMEV_ASSERT(wpp->curline->ipc == 0);
list_add_tail(&wpp->curline->entry, &lm->full_line_list);
lm->full_line_cnt++;
NVMEV_DEBUG("wpp: move line to full_line_list\n");
} else {
NVMEV_DEBUG("wpp: line is moved to victim list\n");
NVMEV_ASSERT(wpp->curline->vpc >= 0 && wpp->curline->vpc < spp->pgs_per_line);
/* there must be some invalid pages in this line */
NVMEV_ASSERT(wpp->curline->ipc > 0);
pqueue_insert(lm->victim_line_pq, wpp->curline);
lm->victim_line_cnt++;
}
/* current line is used up, pick another empty line */
check_addr(wpp->blk, spp->blks_per_pl);
wpp->curline = get_next_free_line(conv_ftl);
NVMEV_DEBUG("wpp: got new clean line %d\n", wpp->curline->id);
wpp->blk = wpp->curline->id;
check_addr(wpp->blk, spp->blks_per_pl);
/* make sure we are starting from page 0 in the super block */
NVMEV_ASSERT(wpp->pg == 0);
NVMEV_ASSERT(wpp->lun == 0);
NVMEV_ASSERT(wpp->ch == 0);
/* TODO: assume # of pl_per_lun is 1, fix later */
NVMEV_ASSERT(wpp->pl == 0);
out:
NVMEV_DEBUG("advanced wpp: ch:%d, lun:%d, pl:%d, blk:%d, pg:%d (curline %d)\n", wpp->ch,
wpp->lun, wpp->pl, wpp->blk, wpp->pg, wpp->curline->id);
}
//66f1
static void advance_write_pointer_DA(struct conv_ftl *conv_ftl, uint32_t io_type)
{
uint32_t glun=conv_ftl->lunpointer;
struct ssdparams *spp = &conv_ftl->ssd->sp;
struct line_mgmt *lm = NULL;
struct write_pointer *wpp = NULL;
lm = conv_ftl->lunlm+conv_ftl->lunpointer;
wpp = __get_wp_DA(conv_ftl, io_type, conv_ftl->lunpointer);
NVMEV_DEBUG("current wpp: ch:%d, lun:%d, pl:%d, blk:%d, pg:%d, glun:%d\n", wpp->ch, wpp->lun,
wpp->pl, wpp->blk, wpp->pg, conv_ftl->lunpointer);
check_addr(wpp->pg, spp->pgs_per_blk);
wpp->pg++; //map page 4k
if ((wpp->pg % spp->pgs_per_oneshotpg) != 0)
{
goto out;
}
NVMEV_DEBUG("page : %u, oneshotpg limit %d\n", spp->pgsz, spp->pgs_per_oneshotpg);
if (wpp->pg == spp->pgs_per_blk)
{//move to next blk
NVMEV_DEBUG("block limit, pgs_per_blk = %d\n", spp->pgs_per_blk);
if (wpp->curline->vpc == spp->pgs_per_lun_line) {
/* all pgs are still valid, move to full line list */
NVMEV_ASSERT(wpp->curline->ipc == 0);
list_add_tail(&wpp->curline->entry, &lm->full_line_list);
lm->full_line_cnt++;
NVMEV_DEBUG("wpp: move line to full_line_list\n");
//NVMEV_ERROR("wpp: move line to full_line_list\n");
} else {
NVMEV_DEBUG("wpp: line is moved to victim list\n");
//NVMEV_ERROR("wpp: line is moved to victim list\n");
NVMEV_ASSERT(wpp->curline->vpc >= 0 && wpp->curline->vpc < spp->pgs_per_lun_line);
/* there must be some invalid pages in this line */
//NVMEV_ERROR("wpp: curline ipc= %d\n", wpp->curline->ipc);
NVMEV_ASSERT(wpp->curline->ipc > 0);
pqueue_insert(lm->victim_line_pq, wpp->curline);
lm->victim_line_cnt++;
}
/* current line is used up, pick another empty line */
check_addr(wpp->blk, spp->blks_per_pl);
wpp->curline = get_next_free_line_DA(conv_ftl, conv_ftl->lunpointer);
NVMEV_DEBUG("wpp: got new clean line %d\n", wpp->curline->id);
//NVMEV_ERROR("wpp: got new clean line %d\n", wpp->curline->id);
wpp->blk = wpp->curline->id;
check_addr(wpp->blk, spp->blks_per_pl);
wpp->pg =0;
}
//ch die interleaving
glun++;
if (glun != conv_ftl->ssd->sp.nchs * conv_ftl->ssd->sp.luns_per_ch)
{
conv_ftl->lunpointer = glun; //next write lun
lm = conv_ftl->lunlm+conv_ftl->lunpointer;
wpp = __get_wp_DA(conv_ftl, io_type, conv_ftl->lunpointer);
//NVMEV_ERROR("wpp ch : %u, lun %d\n", wpp->ch, wpp->lun);
goto out;
}
//NVMEV_ERROR("lun limit\n");
glun=0;
conv_ftl->lunpointer = glun; //next write lun
lm = conv_ftl->lunlm+conv_ftl->lunpointer;
wpp = __get_wp_DA(conv_ftl, io_type, conv_ftl->lunpointer);
out:
NVMEV_DEBUG("advanced wpp: ch:%d, lun:%d, pl:%d, blk:%d, pg:%d (curline %d)\n", wpp->ch,
wpp->lun, wpp->pl, wpp->blk, wpp->pg, wpp->curline->id);
}
//66f1
static struct ppa get_new_page(struct conv_ftl *conv_ftl, uint32_t io_type)
{
struct ppa ppa;
struct write_pointer *wp = __get_wp(conv_ftl, io_type);
ppa.ppa = 0;
ppa.g.ch = wp->ch;
ppa.g.lun = wp->lun;
ppa.g.pg = wp->pg;
ppa.g.blk = wp->blk;
ppa.g.pl = wp->pl;
NVMEV_ASSERT(ppa.g.pl == 0);
return ppa;
}
static struct ppa get_new_page_DA(struct conv_ftl *conv_ftl, uint32_t io_type)
{
struct ppa ppa;
struct write_pointer *wp = __get_wp_DA(conv_ftl, io_type, conv_ftl->lunpointer);
ppa.ppa = 0;
ppa.g.ch = wp->ch;
ppa.g.lun = wp->lun;
ppa.g.pg = wp->pg;
ppa.g.blk = wp->blk;
ppa.g.pl = wp->pl;
NVMEV_ASSERT(ppa.g.pl == 0);
return ppa;
}
static void init_maptbl(struct conv_ftl *conv_ftl)
{
int i;
struct ssdparams *spp = &conv_ftl->ssd->sp;
conv_ftl->maptbl = vmalloc(sizeof(struct ppa) * spp->tt_pgs);
for (i = 0; i < spp->tt_pgs; i++) {
conv_ftl->maptbl[i].ppa = UNMAPPED_PPA;
}
}
static void remove_maptbl(struct conv_ftl *conv_ftl)
{
vfree(conv_ftl->maptbl);
}
static void init_rmap(struct conv_ftl *conv_ftl)
{
int i;
struct ssdparams *spp = &conv_ftl->ssd->sp;
conv_ftl->rmap = vmalloc(sizeof(uint64_t) * spp->tt_pgs);
for (i = 0; i < spp->tt_pgs; i++) {
conv_ftl->rmap[i] = INVALID_LPN;
}
}
static void remove_rmap(struct conv_ftl *conv_ftl)
{
vfree(conv_ftl->rmap);
}
static void conv_init_ftl(struct conv_ftl *conv_ftl, struct convparams *cpp, struct ssd *ssd)
{
/*copy convparams*/
conv_ftl->cp = *cpp;
conv_ftl->ssd = ssd;
/* initialize maptbl */
NVMEV_INFO("initialize maptbl\n");
init_maptbl(conv_ftl); // mapping table
/* initialize rmap */
NVMEV_INFO("initialize rmap\n");
init_rmap(conv_ftl); // reverse mapping table (?)
/* initialize all the lines */
NVMEV_INFO("initialize lines\n");
init_lines(conv_ftl);
//66f1
init_lines_DA(conv_ftl);
//66f1
/* initialize write pointer, this is how we allocate new pages for writes */
NVMEV_INFO("initialize write pointer\n");
prepare_write_pointer(conv_ftl, USER_IO);
prepare_write_pointer(conv_ftl, GC_IO);
//66f1
prepare_write_pointer_DA(conv_ftl, USER_IO);
conv_ftl->lunpointer = 0;
//66f1
init_write_flow_control(conv_ftl);
NVMEV_INFO("Init FTL Instance with %d channels(%ld pages)\n", conv_ftl->ssd->sp.nchs,
conv_ftl->ssd->sp.tt_pgs);
return;
}
static void conv_remove_ftl(struct conv_ftl *conv_ftl)
{
remove_lines(conv_ftl);
//66f1
remove_lines_DA(conv_ftl);
//66f1
remove_rmap(conv_ftl);
remove_maptbl(conv_ftl);
}
static void conv_init_params(struct convparams *cpp)
{
cpp->op_area_pcent = OP_AREA_PERCENT;
cpp->gc_thres_lines = 2; /* Need only two lines.(host write, gc)*/
cpp->gc_thres_lines_high = 2; /* Need only two lines.(host write, gc)*/
cpp->enable_gc_delay = 1;
cpp->pba_pcent = (int)((1 + cpp->op_area_pcent) * 100);
}
void conv_init_namespace(struct nvmev_ns *ns, uint32_t id, uint64_t size, void *mapped_addr,
uint32_t cpu_nr_dispatcher)
{
struct ssdparams spp;
struct convparams cpp;
struct conv_ftl *conv_ftls;
struct ssd *ssd;
uint32_t i;
const uint32_t nr_parts = SSD_PARTITIONS;
ssd_init_params(&spp, size, nr_parts);
conv_init_params(&cpp);
conv_ftls = kmalloc(sizeof(struct conv_ftl) * nr_parts, GFP_KERNEL);
for (i = 0; i < nr_parts; i++) {
//66f1
conv_ftls[i].lunlm = kmalloc(sizeof(struct line_mgmt) * NAND_CHANNELS * LUNS_PER_NAND_CH, GFP_KERNEL);
conv_ftls[i].lunwp = kmalloc(sizeof(struct write_pointer) * NAND_CHANNELS * LUNS_PER_NAND_CH, GFP_KERNEL);
//66f1
ssd = kmalloc(sizeof(struct ssd), GFP_KERNEL);
ssd_init(ssd, &spp, cpu_nr_dispatcher);
conv_init_ftl(&conv_ftls[i], &cpp, ssd);
}
/* PCIe, Write buffer are shared by all instances*/
for (i = 1; i < nr_parts; i++) {
kfree(conv_ftls[i].ssd->pcie->perf_model);
kfree(conv_ftls[i].ssd->pcie);
kfree(conv_ftls[i].ssd->write_buffer);
conv_ftls[i].ssd->pcie = conv_ftls[0].ssd->pcie;
conv_ftls[i].ssd->write_buffer = conv_ftls[0].ssd->write_buffer;
}
ns->id = id;
ns->csi = NVME_CSI_NVM;
ns->nr_parts = nr_parts;
ns->ftls = (void *)conv_ftls;
ns->size = (uint64_t)((size * 100) / cpp.pba_pcent);
ns->mapped = mapped_addr;
/*register io command handler*/
ns->proc_io_cmd = conv_proc_nvme_io_cmd;
NVMEV_INFO("FTL physical space: %lld, logical space: %lld (physical/logical * 100 = %d)\n",
size, ns->size, cpp.pba_pcent);
return;
}
void conv_remove_namespace(struct nvmev_ns *ns)
{
struct conv_ftl *conv_ftls = (struct conv_ftl *)ns->ftls;
const uint32_t nr_parts = SSD_PARTITIONS;
uint32_t i;
/* PCIe, Write buffer are shared by all instances*/
for (i = 1; i < nr_parts; i++) {
/*
* These were freed from conv_init_namespace() already.
* Mark these NULL so that ssd_remove() skips it.
*/
conv_ftls[i].ssd->pcie = NULL;
conv_ftls[i].ssd->write_buffer = NULL;
//66f1
kfree(conv_ftls[i].lunlm);
kfree(conv_ftls[i].lunwp);
//66f1
}
for (i = 0; i < nr_parts; i++) {
conv_remove_ftl(&conv_ftls[i]);
ssd_remove(conv_ftls[i].ssd);
kfree(conv_ftls[i].ssd);
}
kfree(conv_ftls);
ns->ftls = NULL;
}
static inline bool valid_ppa(struct conv_ftl *conv_ftl, struct ppa *ppa)
{
struct ssdparams *spp = &conv_ftl->ssd->sp;
int ch = ppa->g.ch;
int lun = ppa->g.lun;
int pl = ppa->g.pl;
int blk = ppa->g.blk;
int pg = ppa->g.pg;
//int sec = ppa->g.sec;
if (ch < 0 || ch >= spp->nchs)
return false;
if (lun < 0 || lun >= spp->luns_per_ch)
return false;
if (pl < 0 || pl >= spp->pls_per_lun)
return false;
if (blk < 0 || blk >= spp->blks_per_pl)
return false;
if (pg < 0 || pg >= spp->pgs_per_blk)
return false;
return true;
}
static inline bool valid_lpn(struct conv_ftl *conv_ftl, uint64_t lpn)
{
return (lpn < conv_ftl->ssd->sp.tt_pgs);
}
static inline bool mapped_ppa(struct ppa *ppa)
{
return !(ppa->ppa == UNMAPPED_PPA);
}
static inline uint32_t get_glun(struct conv_ftl *conv_ftl, struct ppa *ppa)
{
return (ppa->g.lun * conv_ftl->ssd->sp.nchs + ppa->g.ch);
}
static inline struct line *get_line(struct conv_ftl *conv_ftl, struct ppa *ppa)
{
return &(conv_ftl->lm.lines[ppa->g.blk]);
}
static inline struct line *get_line_DA(struct conv_ftl *conv_ftl, struct ppa *ppa)
{
uint32_t glun = get_glun(conv_ftl, ppa);
struct line_mgmt *lm = conv_ftl->lunlm+glun;
return &(lm->lines[ppa->g.blk]);
}
/* update SSD status about one page from PG_VALID -> PG_VALID */
static void mark_page_invalid(struct conv_ftl *conv_ftl, struct ppa *ppa)
{
struct ssdparams *spp = &conv_ftl->ssd->sp;
struct line_mgmt *lm = &conv_ftl->lm;
//66f1
uint32_t glun = get_glun(conv_ftl, ppa);
struct line_mgmt *lunlm = conv_ftl->lunlm+glun;
//66f1
struct nand_block *blk = NULL;
struct nand_page *pg = NULL;
bool was_full_line = false;
struct line *line;
/* update corresponding page status */
pg = get_pg(conv_ftl->ssd, ppa);
NVMEV_ASSERT(pg->status == PG_VALID);
pg->status = PG_INVALID;
/* update corresponding block status */
blk = get_blk(conv_ftl->ssd, ppa);
NVMEV_ASSERT(blk->ipc >= 0 && blk->ipc < spp->pgs_per_blk);
blk->ipc++;
NVMEV_ASSERT(blk->vpc > 0 && blk->vpc <= spp->pgs_per_blk);
blk->vpc--;
/* update corresponding line status */
line = get_line(conv_ftl, ppa);
NVMEV_ASSERT(line->ipc >= 0 && line->ipc < spp->pgs_per_line);
if (line->vpc == spp->pgs_per_line) {
NVMEV_ASSERT(line->ipc == 0);
was_full_line = true;
}
line->ipc++;
NVMEV_ASSERT(line->vpc > 0 && line->vpc <= spp->pgs_per_line);
/* Adjust the position of the victime line in the pq under over-writes */
if (line->pos) {
/* Note that line->vpc will be updated by this call */
pqueue_change_priority(lm->victim_line_pq, line->vpc - 1, line);
} else {
line->vpc--;
}
if (was_full_line) {
/* move line: "full" -> "victim" */
list_del_init(&line->entry);
lm->full_line_cnt--;
pqueue_insert(lm->victim_line_pq, line);
lm->victim_line_cnt++;
}
//66f1 lunlm update
was_full_line = false;
/* update corresponding line status */
line = get_line_DA(conv_ftl, ppa);
NVMEV_ASSERT(line->ipc >= 0 && line->ipc < spp->pgs_per_line);
if (line->vpc == spp->pgs_per_line) {
NVMEV_ASSERT(line->ipc == 0);
was_full_line = true;
}
line->ipc++;
NVMEV_ASSERT(line->vpc > 0 && line->vpc <= spp->pgs_per_line);
/* Adjust the position of the victime line in the pq under over-writes */
if (line->pos) {
/* Note that line->vpc will be updated by this call */
pqueue_change_priority(lunlm->victim_line_pq, line->vpc - 1, line);
} else {
line->vpc--;
}
if (was_full_line) {
/* move line: "full" -> "victim" */
list_del_init(&line->entry);
lunlm->full_line_cnt--;
pqueue_insert(lunlm->victim_line_pq, line);
lunlm->victim_line_cnt++;
}
//66f1
}
static void mark_page_valid(struct conv_ftl *conv_ftl, struct ppa *ppa)
{
struct ssdparams *spp = &conv_ftl->ssd->sp;
struct nand_block *blk = NULL;
struct nand_page *pg = NULL;
struct line *line;
/* update page status */
pg = get_pg(conv_ftl->ssd, ppa);
NVMEV_ASSERT(pg->status == PG_FREE);
pg->status = PG_VALID;
/* update corresponding block status */
blk = get_blk(conv_ftl->ssd, ppa);
NVMEV_ASSERT(blk->vpc >= 0 && blk->vpc < spp->pgs_per_blk);
blk->vpc++;
/* update corresponding line status */
line = get_line(conv_ftl, ppa);
NVMEV_ASSERT(line->vpc >= 0 && line->vpc < spp->pgs_per_line);
line->vpc++;
//66f1
line = get_line_DA(conv_ftl, ppa);
NVMEV_ASSERT(line->vpc >= 0 && line->vpc < spp->pgs_per_line);
line->vpc++;
//66f1
}
static void mark_block_free(struct conv_ftl *conv_ftl, struct ppa *ppa)
{
struct ssdparams *spp = &conv_ftl->ssd->sp;
struct nand_block *blk = get_blk(conv_ftl->ssd, ppa);
struct nand_page *pg = NULL;
int i;
for (i = 0; i < spp->pgs_per_blk; i++) {
/* reset page status */
pg = &blk->pg[i];
NVMEV_ASSERT(pg->nsecs == spp->secs_per_pg);
pg->status = PG_FREE;
}
/* reset block status */
NVMEV_ASSERT(blk->npgs == spp->pgs_per_blk);
blk->ipc = 0;
blk->vpc = 0;
blk->erase_cnt++;
}
static void gc_read_page(struct conv_ftl *conv_ftl, struct ppa *ppa)
{
struct ssdparams *spp = &conv_ftl->ssd->sp;
struct convparams *cpp = &conv_ftl->cp;
/* advance conv_ftl status, we don't care about how long it takes */
if (cpp->enable_gc_delay) {
struct nand_cmd gcr = {
.type = GC_IO,
.cmd = NAND_READ,
.stime = 0,
.xfer_size = spp->pgsz,
.interleave_pci_dma = false,
.ppa = ppa,
};
ssd_advance_nand(conv_ftl->ssd, &gcr);
}
}
/* move valid page data (already in DRAM) from victim line to a new page */
static uint64_t gc_write_page(struct conv_ftl *conv_ftl, struct ppa *old_ppa)
{
struct ssdparams *spp = &conv_ftl->ssd->sp;
struct convparams *cpp = &conv_ftl->cp;
struct ppa new_ppa;
uint64_t lpn = get_rmap_ent(conv_ftl, old_ppa);
NVMEV_ASSERT(valid_lpn(conv_ftl, lpn));
new_ppa = get_new_page(conv_ftl, GC_IO);
/* update maptbl */
set_maptbl_ent(conv_ftl, lpn, &new_ppa);
/* update rmap */
set_rmap_ent(conv_ftl, lpn, &new_ppa);
mark_page_valid(conv_ftl, &new_ppa);
/* need to advance the write pointer here */
advance_write_pointer(conv_ftl, GC_IO);
if (cpp->enable_gc_delay) {
struct nand_cmd gcw = {
.type = GC_IO,
.cmd = NAND_NOP,
.stime = 0,
.interleave_pci_dma = false,
.ppa = &new_ppa,
};
if (last_pg_in_wordline(conv_ftl, &new_ppa)) {
gcw.cmd = NAND_WRITE;
gcw.xfer_size = spp->pgsz * spp->pgs_per_oneshotpg;
}
ssd_advance_nand(conv_ftl->ssd, &gcw);
}
/* advance per-ch gc_endtime as well */
#if 0
new_ch = get_ch(conv_ftl, &new_ppa);
new_ch->gc_endtime = new_ch->next_ch_avail_time;
new_lun = get_lun(conv_ftl, &new_ppa);
new_lun->gc_endtime = new_lun->next_lun_avail_time;
#endif
return 0;
}
static struct line *select_victim_line(struct conv_ftl *conv_ftl, bool force)
{
struct ssdparams *spp = &conv_ftl->ssd->sp;
struct line_mgmt *lm = &conv_ftl->lm;
struct line *victim_line = NULL;
victim_line = pqueue_peek(lm->victim_line_pq);
if (!victim_line) {
return NULL;
}
if (!force && (victim_line->vpc > (spp->pgs_per_line / 8))) {
return NULL;
}
pqueue_pop(lm->victim_line_pq);
victim_line->pos = 0;
lm->victim_line_cnt--;
/* victim_line is a danggling node now */
return victim_line;
}
/* here ppa identifies the block we want to clean */
static void clean_one_block(struct conv_ftl *conv_ftl, struct ppa *ppa)
{
struct ssdparams *spp = &conv_ftl->ssd->sp;
struct nand_page *pg_iter = NULL;
int cnt = 0;
int pg;
for (pg = 0; pg < spp->pgs_per_blk; pg++) {
ppa->g.pg = pg;
pg_iter = get_pg(conv_ftl->ssd, ppa);
/* there shouldn't be any free page in victim blocks */
NVMEV_ASSERT(pg_iter->status != PG_FREE);
if (pg_iter->status == PG_VALID) {
gc_read_page(conv_ftl, ppa);
/* delay the maptbl update until "write" happens */
gc_write_page(conv_ftl, ppa);
cnt++;
}
}
NVMEV_ASSERT(get_blk(conv_ftl->ssd, ppa)->vpc == cnt);
}
/* here ppa identifies the block we want to clean */
static void clean_one_flashpg(struct conv_ftl *conv_ftl, struct ppa *ppa)
{
struct ssdparams *spp = &conv_ftl->ssd->sp;
struct convparams *cpp = &conv_ftl->cp;
struct nand_page *pg_iter = NULL;
int cnt = 0, i = 0;