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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* SN Platform GRU Driver
*
* Dump GRU State
*
* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <asm/uv/uv_hub.h>
#include <linux/nospec.h>
#include "gru.h"
#include "grutables.h"
#include "gruhandles.h"
#include "grulib.h"
#define CCH_LOCK_ATTEMPTS 10
static int gru_user_copy_handle(void __user **dp, void *s)
{
if (copy_to_user(*dp, s, GRU_HANDLE_BYTES))
return -1;
*dp += GRU_HANDLE_BYTES;
return 0;
}
static int gru_dump_context_data(void *grubase,
struct gru_context_configuration_handle *cch,
void __user *ubuf, int ctxnum, int dsrcnt,
int flush_cbrs)
{
void *cb, *cbe, *tfh, *gseg;
int i, scr;
gseg = grubase + ctxnum * GRU_GSEG_STRIDE;
cb = gseg + GRU_CB_BASE;
cbe = grubase + GRU_CBE_BASE;
tfh = grubase + GRU_TFH_BASE;
for_each_cbr_in_allocation_map(i, &cch->cbr_allocation_map, scr) {
if (flush_cbrs)
gru_flush_cache(cb);
if (gru_user_copy_handle(&ubuf, cb))
goto fail;
if (gru_user_copy_handle(&ubuf, tfh + i * GRU_HANDLE_STRIDE))
goto fail;
if (gru_user_copy_handle(&ubuf, cbe + i * GRU_HANDLE_STRIDE))
goto fail;
cb += GRU_HANDLE_STRIDE;
}
if (dsrcnt)
memcpy(ubuf, gseg + GRU_DS_BASE, dsrcnt * GRU_HANDLE_STRIDE);
return 0;
fail:
return -EFAULT;
}
static int gru_dump_tfm(struct gru_state *gru,
void __user *ubuf, void __user *ubufend)
{
struct gru_tlb_fault_map *tfm;
int i;
if (GRU_NUM_TFM * GRU_CACHE_LINE_BYTES > ubufend - ubuf)
return -EFBIG;
for (i = 0; i < GRU_NUM_TFM; i++) {
tfm = get_tfm(gru->gs_gru_base_vaddr, i);
if (gru_user_copy_handle(&ubuf, tfm))
goto fail;
}
return GRU_NUM_TFM * GRU_CACHE_LINE_BYTES;
fail:
return -EFAULT;
}
static int gru_dump_tgh(struct gru_state *gru,
void __user *ubuf, void __user *ubufend)
{
struct gru_tlb_global_handle *tgh;
int i;
if (GRU_NUM_TGH * GRU_CACHE_LINE_BYTES > ubufend - ubuf)
return -EFBIG;
for (i = 0; i < GRU_NUM_TGH; i++) {
tgh = get_tgh(gru->gs_gru_base_vaddr, i);
if (gru_user_copy_handle(&ubuf, tgh))
goto fail;
}
return GRU_NUM_TGH * GRU_CACHE_LINE_BYTES;
fail:
return -EFAULT;
}
static int gru_dump_context(struct gru_state *gru, int ctxnum,
void __user *ubuf, void __user *ubufend, char data_opt,
char lock_cch, char flush_cbrs)
{
struct gru_dump_context_header hdr;
struct gru_dump_context_header __user *uhdr = ubuf;
struct gru_context_configuration_handle *cch, *ubufcch;
struct gru_thread_state *gts;
int try, cch_locked, cbrcnt = 0, dsrcnt = 0, bytes = 0, ret = 0;
void *grubase;
memset(&hdr, 0, sizeof(hdr));
grubase = gru->gs_gru_base_vaddr;
cch = get_cch(grubase, ctxnum);
for (try = 0; try < CCH_LOCK_ATTEMPTS; try++) {
cch_locked = trylock_cch_handle(cch);
if (cch_locked)
break;
msleep(1);
}
ubuf += sizeof(hdr);
ubufcch = ubuf;
if (gru_user_copy_handle(&ubuf, cch)) {
if (cch_locked)
unlock_cch_handle(cch);
return -EFAULT;
}
if (cch_locked)
ubufcch->delresp = 0;
bytes = sizeof(hdr) + GRU_CACHE_LINE_BYTES;
if (cch_locked || !lock_cch) {
gts = gru->gs_gts[ctxnum];
if (gts && gts->ts_vma) {
hdr.pid = gts->ts_tgid_owner;
hdr.vaddr = gts->ts_vma->vm_start;
}
if (cch->state != CCHSTATE_INACTIVE) {
cbrcnt = hweight64(cch->cbr_allocation_map) *
GRU_CBR_AU_SIZE;
dsrcnt = data_opt ? hweight32(cch->dsr_allocation_map) *
GRU_DSR_AU_CL : 0;
}
bytes += (3 * cbrcnt + dsrcnt) * GRU_CACHE_LINE_BYTES;
if (bytes > ubufend - ubuf)
ret = -EFBIG;
else
ret = gru_dump_context_data(grubase, cch, ubuf, ctxnum,
dsrcnt, flush_cbrs);
}
if (cch_locked)
unlock_cch_handle(cch);
if (ret)
return ret;
hdr.magic = GRU_DUMP_MAGIC;
hdr.gid = gru->gs_gid;
hdr.ctxnum = ctxnum;
hdr.cbrcnt = cbrcnt;
hdr.dsrcnt = dsrcnt;
hdr.cch_locked = cch_locked;
if (copy_to_user(uhdr, &hdr, sizeof(hdr)))
return -EFAULT;
return bytes;
}
int gru_dump_chiplet_request(unsigned long arg)
{
struct gru_state *gru;
struct gru_dump_chiplet_state_req req;
void __user *ubuf;
void __user *ubufend;
int ctxnum, ret, cnt = 0;
if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
return -EFAULT;
/* Currently, only dump by gid is implemented */
if (req.gid >= gru_max_gids)
return -EINVAL;
req.gid = array_index_nospec(req.gid, gru_max_gids);
gru = GID_TO_GRU(req.gid);
ubuf = req.buf;
ubufend = req.buf + req.buflen;
ret = gru_dump_tfm(gru, ubuf, ubufend);
if (ret < 0)
goto fail;
ubuf += ret;
ret = gru_dump_tgh(gru, ubuf, ubufend);
if (ret < 0)
goto fail;
ubuf += ret;
for (ctxnum = 0; ctxnum < GRU_NUM_CCH; ctxnum++) {
if (req.ctxnum == ctxnum || req.ctxnum < 0) {
ret = gru_dump_context(gru, ctxnum, ubuf, ubufend,
req.data_opt, req.lock_cch,
req.flush_cbrs);
if (ret < 0)
goto fail;
ubuf += ret;
cnt++;
}
}
if (copy_to_user((void __user *)arg, &req, sizeof(req)))
return -EFAULT;
return cnt;
fail:
return ret;
}
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