cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

fifo.c (2524B)

      1/*
      2 * Copyright 2018 Red Hat Inc.
      3 *
      4 * Permission is hereby granted, free of charge, to any person obtaining a
      5 * copy of this software and associated documentation files (the "Software"),
      6 * to deal in the Software without restriction, including without limitation
      7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8 * and/or sell copies of the Software, and to permit persons to whom the
      9 * Software is furnished to do so, subject to the following conditions:
     10 *
     11 * The above copyright notice and this permission notice shall be included in
     12 * all copies or substantial portions of the Software.
     13 *
     14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20 * OTHER DEALINGS IN THE SOFTWARE.
     21 */
     22#include <nvif/fifo.h>
     23
     24static int
     25nvif_fifo_runlists(struct nvif_device *device)
     26{
     27	struct nvif_object *object = &device->object;
     28	struct {
     29		struct nv_device_info_v1 m;
     30		struct {
     31			struct nv_device_info_v1_data runlists;
     32			struct nv_device_info_v1_data runlist[64];
     33		} v;
     34	} *a;
     35	int ret, i;
     36
     37	if (device->runlist)
     38		return 0;
     39
     40	if (!(a = kmalloc(sizeof(*a), GFP_KERNEL)))
     41		return -ENOMEM;
     42	a->m.version = 1;
     43	a->m.count = sizeof(a->v) / sizeof(a->v.runlists);
     44	a->v.runlists.mthd = NV_DEVICE_HOST_RUNLISTS;
     45	for (i = 0; i < ARRAY_SIZE(a->v.runlist); i++) {
     46		a->v.runlist[i].mthd = NV_DEVICE_HOST_RUNLIST_ENGINES;
     47		a->v.runlist[i].data = i;
     48	}
     49
     50	ret = nvif_object_mthd(object, NV_DEVICE_V0_INFO, a, sizeof(*a));
     51	if (ret)
     52		goto done;
     53
     54	device->runlists = fls64(a->v.runlists.data);
     55	device->runlist = kcalloc(device->runlists, sizeof(*device->runlist),
     56				  GFP_KERNEL);
     57	if (!device->runlist) {
     58		ret = -ENOMEM;
     59		goto done;
     60	}
     61
     62	for (i = 0; i < device->runlists; i++) {
     63		if (a->v.runlist[i].mthd != NV_DEVICE_INFO_INVALID)
     64			device->runlist[i].engines = a->v.runlist[i].data;
     65	}
     66
     67done:
     68	kfree(a);
     69	return ret;
     70}
     71
     72u64
     73nvif_fifo_runlist(struct nvif_device *device, u64 engine)
     74{
     75	u64 runm = 0;
     76	int ret, i;
     77
     78	if ((ret = nvif_fifo_runlists(device)))
     79		return runm;
     80
     81	for (i = 0; i < device->runlists; i++) {
     82		if (device->runlist[i].engines & engine)
     83			runm |= BIT_ULL(i);
     84	}
     85
     86	return runm;
     87}