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

head.c (3059B)

      1/*
      2 * Copyright 2017 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 * Authors: Ben Skeggs <bskeggs@redhat.com>
     23 */
     24#include "head.h"
     25
     26#include <core/client.h>
     27
     28#include <nvif/cl0046.h>
     29#include <nvif/unpack.h>
     30
     31struct nvkm_head *
     32nvkm_head_find(struct nvkm_disp *disp, int id)
     33{
     34	struct nvkm_head *head;
     35	list_for_each_entry(head, &disp->head, head) {
     36		if (head->id == id)
     37			return head;
     38	}
     39	return NULL;
     40}
     41
     42int
     43nvkm_head_mthd_scanoutpos(struct nvkm_object *object,
     44			  struct nvkm_head *head, void *data, u32 size)
     45{
     46	union {
     47		struct nv04_disp_scanoutpos_v0 v0;
     48	} *args = data;
     49	int ret = -ENOSYS;
     50
     51	nvif_ioctl(object, "head scanoutpos size %d\n", size);
     52	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
     53		nvif_ioctl(object, "head scanoutpos vers %d\n",
     54			   args->v0.version);
     55
     56		head->func->state(head, &head->arm);
     57		args->v0.vtotal  = head->arm.vtotal;
     58		args->v0.vblanks = head->arm.vblanks;
     59		args->v0.vblanke = head->arm.vblanke;
     60		args->v0.htotal  = head->arm.htotal;
     61		args->v0.hblanks = head->arm.hblanks;
     62		args->v0.hblanke = head->arm.hblanke;
     63
     64		/* We don't support reading htotal/vtotal on pre-NV50 VGA,
     65		 * so we have to give up and trigger the timestamping
     66		 * fallback in the drm core.
     67		 */
     68		if (!args->v0.vtotal || !args->v0.htotal)
     69			return -ENOTSUPP;
     70
     71		args->v0.time[0] = ktime_to_ns(ktime_get());
     72		head->func->rgpos(head, &args->v0.hline, &args->v0.vline);
     73		args->v0.time[1] = ktime_to_ns(ktime_get());
     74	} else
     75		return ret;
     76
     77	return 0;
     78}
     79
     80void
     81nvkm_head_del(struct nvkm_head **phead)
     82{
     83	struct nvkm_head *head = *phead;
     84	if (head) {
     85		HEAD_DBG(head, "dtor");
     86		list_del(&head->head);
     87		kfree(*phead);
     88		*phead = NULL;
     89	}
     90}
     91
     92int
     93nvkm_head_new_(const struct nvkm_head_func *func,
     94	       struct nvkm_disp *disp, int id)
     95{
     96	struct nvkm_head *head;
     97	if (!(head = kzalloc(sizeof(*head), GFP_KERNEL)))
     98		return -ENOMEM;
     99	head->func = func;
    100	head->disp = disp;
    101	head->id = id;
    102	list_add_tail(&head->head, &disp->head);
    103	HEAD_DBG(head, "ctor");
    104	return 0;
    105}