[mirror_ubuntu-bionic-kernel.git] / drivers / misc / sgi-gru / grukdump.c

/*
 * SN Platform GRU Driver
 *
 *            Dump GRU State
 *
 *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#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 "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;

	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;
}
Commit	Line	Data
9cc9b056 JS	1	/*
	2	* SN Platform GRU Driver
	3	*
	4	* Dump GRU State
	5	*
8820f27a	6	* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
9cc9b056	7	*
8820f27a JS	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
9cc9b056 JS	21	*/
	22
	23	#include <linux/kernel.h>
	24	#include <linux/mm.h>
	25	#include <linux/spinlock.h>
	26	#include <linux/uaccess.h>
	27	#include <linux/delay.h>
	28	#include <linux/bitops.h>
	29	#include <asm/uv/uv_hub.h>
	30	#include "gru.h"
	31	#include "grutables.h"
	32	#include "gruhandles.h"
	33	#include "grulib.h"
	34
	35	#define CCH_LOCK_ATTEMPTS 10
	36
	37	static int gru_user_copy_handle(void __user *dp, void s)
	38	{
2b702b28	39	if (copy_to_user(*dp, s, GRU_HANDLE_BYTES))
9cc9b056 JS	40	return -1;
	41	*dp += GRU_HANDLE_BYTES;
	42	return 0;
	43	}
	44
	45	static int gru_dump_context_data(void *grubase,
	46	struct gru_context_configuration_handle *cch,
b8229bed JS	47	void __user *ubuf, int ctxnum, int dsrcnt,
b8229bed JS	48	int flush_cbrs)
9cc9b056 JS	49	{
	50	void cb, cbe, tfh, gseg;
	51	int i, scr;
	52
	53	gseg = grubase + ctxnum * GRU_GSEG_STRIDE;
	54	cb = gseg + GRU_CB_BASE;
	55	cbe = grubase + GRU_CBE_BASE;
	56	tfh = grubase + GRU_TFH_BASE;
	57
	58	for_each_cbr_in_allocation_map(i, &cch->cbr_allocation_map, scr) {
b8229bed JS	59	if (flush_cbrs)
b8229bed JS	60	gru_flush_cache(cb);
9cc9b056 JS	61	if (gru_user_copy_handle(&ubuf, cb))
	62	goto fail;
	63	if (gru_user_copy_handle(&ubuf, tfh + i * GRU_HANDLE_STRIDE))
	64	goto fail;
	65	if (gru_user_copy_handle(&ubuf, cbe + i * GRU_HANDLE_STRIDE))
	66	goto fail;
	67	cb += GRU_HANDLE_STRIDE;
	68	}
	69	if (dsrcnt)
	70	memcpy(ubuf, gseg + GRU_DS_BASE, dsrcnt * GRU_HANDLE_STRIDE);
	71	return 0;
	72
	73	fail:
	74	return -EFAULT;
	75	}
	76
	77	static int gru_dump_tfm(struct gru_state *gru,
	78	void __user ubuf, void __user ubufend)
	79	{
	80	struct gru_tlb_fault_map *tfm;
a010d276	81	int i;
9cc9b056	82
a010d276 SM	83	if (GRU_NUM_TFM * GRU_CACHE_LINE_BYTES > ubufend - ubuf)
a010d276 SM	84	return -EFBIG;
9cc9b056 JS	85
	86	for (i = 0; i < GRU_NUM_TFM; i++) {
	87	tfm = get_tfm(gru->gs_gru_base_vaddr, i);
	88	if (gru_user_copy_handle(&ubuf, tfm))
	89	goto fail;
	90	}
	91	return GRU_NUM_TFM * GRU_CACHE_LINE_BYTES;
	92
	93	fail:
	94	return -EFAULT;
	95	}
	96
	97	static int gru_dump_tgh(struct gru_state *gru,
	98	void __user ubuf, void __user ubufend)
	99	{
	100	struct gru_tlb_global_handle *tgh;
a010d276	101	int i;
9cc9b056	102
a010d276 SM	103	if (GRU_NUM_TGH * GRU_CACHE_LINE_BYTES > ubufend - ubuf)
a010d276 SM	104	return -EFBIG;
9cc9b056 JS	105
	106	for (i = 0; i < GRU_NUM_TGH; i++) {
	107	tgh = get_tgh(gru->gs_gru_base_vaddr, i);
	108	if (gru_user_copy_handle(&ubuf, tgh))
	109	goto fail;
	110	}
	111	return GRU_NUM_TGH * GRU_CACHE_LINE_BYTES;
	112
	113	fail:
	114	return -EFAULT;
	115	}
	116
	117	static int gru_dump_context(struct gru_state *gru, int ctxnum,
	118	void __user ubuf, void __user ubufend, char data_opt,
b8229bed	119	char lock_cch, char flush_cbrs)
9cc9b056 JS	120	{
	121	struct gru_dump_context_header hdr;
	122	struct gru_dump_context_header __user *uhdr = ubuf;
2b702b28	123	struct gru_context_configuration_handle cch, ubufcch;
9cc9b056 JS	124	struct gru_thread_state *gts;
	125	int try, cch_locked, cbrcnt = 0, dsrcnt = 0, bytes = 0, ret = 0;
	126	void *grubase;
	127
	128	memset(&hdr, 0, sizeof(hdr));
	129	grubase = gru->gs_gru_base_vaddr;
	130	cch = get_cch(grubase, ctxnum);
	131	for (try = 0; try < CCH_LOCK_ATTEMPTS; try++) {
	132	cch_locked = trylock_cch_handle(cch);
	133	if (cch_locked)
	134	break;
	135	msleep(1);
	136	}
	137
	138	ubuf += sizeof(hdr);
2b702b28	139	ubufcch = ubuf;
49d3d6c3 DC	140	if (gru_user_copy_handle(&ubuf, cch)) {
	141	if (cch_locked)
	142	unlock_cch_handle(cch);
	143	return -EFAULT;
	144	}
2b702b28 JS	145	if (cch_locked)
2b702b28 JS	146	ubufcch->delresp = 0;
9cc9b056 JS	147	bytes = sizeof(hdr) + GRU_CACHE_LINE_BYTES;
	148
	149	if (cch_locked \|\| !lock_cch) {
	150	gts = gru->gs_gts[ctxnum];
836ce679	151	if (gts && gts->ts_vma) {
9cc9b056 JS	152	hdr.pid = gts->ts_tgid_owner;
	153	hdr.vaddr = gts->ts_vma->vm_start;
	154	}
	155	if (cch->state != CCHSTATE_INACTIVE) {
	156	cbrcnt = hweight64(cch->cbr_allocation_map) *
	157	GRU_CBR_AU_SIZE;
	158	dsrcnt = data_opt ? hweight32(cch->dsr_allocation_map) *
	159	GRU_DSR_AU_CL : 0;
	160	}
	161	bytes += (3 * cbrcnt + dsrcnt) * GRU_CACHE_LINE_BYTES;
	162	if (bytes > ubufend - ubuf)
	163	ret = -EFBIG;
	164	else
	165	ret = gru_dump_context_data(grubase, cch, ubuf, ctxnum,
b8229bed	166	dsrcnt, flush_cbrs);
9cc9b056 JS	167	}
	168	if (cch_locked)
	169	unlock_cch_handle(cch);
	170	if (ret)
	171	return ret;
	172
	173	hdr.magic = GRU_DUMP_MAGIC;
2b702b28	174	hdr.gid = gru->gs_gid;
9cc9b056 JS	175	hdr.ctxnum = ctxnum;
	176	hdr.cbrcnt = cbrcnt;
	177	hdr.dsrcnt = dsrcnt;
	178	hdr.cch_locked = cch_locked;
b6a83d92 DC	179	if (copy_to_user(uhdr, &hdr, sizeof(hdr)))
b6a83d92 DC	180	return -EFAULT;
9cc9b056	181
b6a83d92	182	return bytes;
9cc9b056 JS	183	}
	184
	185	int gru_dump_chiplet_request(unsigned long arg)
	186	{
	187	struct gru_state *gru;
	188	struct gru_dump_chiplet_state_req req;
	189	void __user *ubuf;
	190	void __user *ubufend;
	191	int ctxnum, ret, cnt = 0;
	192
	193	if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
	194	return -EFAULT;
	195
	196	/* Currently, only dump by gid is implemented */
c2ed545c	197	if (req.gid >= gru_max_gids)
9cc9b056 JS	198	return -EINVAL;
	199
	200	gru = GID_TO_GRU(req.gid);
	201	ubuf = req.buf;
	202	ubufend = req.buf + req.buflen;
	203
	204	ret = gru_dump_tfm(gru, ubuf, ubufend);
	205	if (ret < 0)
	206	goto fail;
	207	ubuf += ret;
	208
	209	ret = gru_dump_tgh(gru, ubuf, ubufend);
	210	if (ret < 0)
	211	goto fail;
	212	ubuf += ret;
	213
	214	for (ctxnum = 0; ctxnum < GRU_NUM_CCH; ctxnum++) {
	215	if (req.ctxnum == ctxnum \|\| req.ctxnum < 0) {
	216	ret = gru_dump_context(gru, ctxnum, ubuf, ubufend,
b8229bed JS	217	req.data_opt, req.lock_cch,
b8229bed JS	218	req.flush_cbrs);
9cc9b056 JS	219	if (ret < 0)
	220	goto fail;
	221	ubuf += ret;
	222	cnt++;
	223	}
	224	}
	225
	226	if (copy_to_user((void __user *)arg, &req, sizeof(req)))
	227	return -EFAULT;
	228	return cnt;
	229
	230	fail:
	231	return ret;
	232	}