cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mdp4_irq.c (2975B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2013 Red Hat
      4 * Author: Rob Clark <robdclark@gmail.com>
      5 */
      6
      7#include <drm/drm_print.h>
      8#include <drm/drm_vblank.h>
      9
     10#include "msm_drv.h"
     11#include "mdp4_kms.h"
     12
     13void mdp4_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask,
     14		uint32_t old_irqmask)
     15{
     16	mdp4_write(to_mdp4_kms(mdp_kms), REG_MDP4_INTR_CLEAR,
     17		irqmask ^ (irqmask & old_irqmask));
     18	mdp4_write(to_mdp4_kms(mdp_kms), REG_MDP4_INTR_ENABLE, irqmask);
     19}
     20
     21static void mdp4_irq_error_handler(struct mdp_irq *irq, uint32_t irqstatus)
     22{
     23	struct mdp4_kms *mdp4_kms = container_of(irq, struct mdp4_kms, error_handler);
     24	static DEFINE_RATELIMIT_STATE(rs, 5*HZ, 1);
     25	extern bool dumpstate;
     26
     27	DRM_ERROR_RATELIMITED("errors: %08x\n", irqstatus);
     28
     29	if (dumpstate && __ratelimit(&rs)) {
     30		struct drm_printer p = drm_info_printer(mdp4_kms->dev->dev);
     31		drm_state_dump(mdp4_kms->dev, &p);
     32	}
     33}
     34
     35void mdp4_irq_preinstall(struct msm_kms *kms)
     36{
     37	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
     38	mdp4_enable(mdp4_kms);
     39	mdp4_write(mdp4_kms, REG_MDP4_INTR_CLEAR, 0xffffffff);
     40	mdp4_write(mdp4_kms, REG_MDP4_INTR_ENABLE, 0x00000000);
     41	mdp4_disable(mdp4_kms);
     42}
     43
     44int mdp4_irq_postinstall(struct msm_kms *kms)
     45{
     46	struct mdp_kms *mdp_kms = to_mdp_kms(kms);
     47	struct mdp4_kms *mdp4_kms = to_mdp4_kms(mdp_kms);
     48	struct mdp_irq *error_handler = &mdp4_kms->error_handler;
     49
     50	error_handler->irq = mdp4_irq_error_handler;
     51	error_handler->irqmask = MDP4_IRQ_PRIMARY_INTF_UDERRUN |
     52			MDP4_IRQ_EXTERNAL_INTF_UDERRUN;
     53
     54	mdp_irq_register(mdp_kms, error_handler);
     55
     56	return 0;
     57}
     58
     59void mdp4_irq_uninstall(struct msm_kms *kms)
     60{
     61	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
     62	mdp4_enable(mdp4_kms);
     63	mdp4_write(mdp4_kms, REG_MDP4_INTR_ENABLE, 0x00000000);
     64	mdp4_disable(mdp4_kms);
     65}
     66
     67irqreturn_t mdp4_irq(struct msm_kms *kms)
     68{
     69	struct mdp_kms *mdp_kms = to_mdp_kms(kms);
     70	struct mdp4_kms *mdp4_kms = to_mdp4_kms(mdp_kms);
     71	struct drm_device *dev = mdp4_kms->dev;
     72	struct msm_drm_private *priv = dev->dev_private;
     73	unsigned int id;
     74	uint32_t status, enable;
     75
     76	enable = mdp4_read(mdp4_kms, REG_MDP4_INTR_ENABLE);
     77	status = mdp4_read(mdp4_kms, REG_MDP4_INTR_STATUS) & enable;
     78	mdp4_write(mdp4_kms, REG_MDP4_INTR_CLEAR, status);
     79
     80	VERB("status=%08x", status);
     81
     82	mdp_dispatch_irqs(mdp_kms, status);
     83
     84	for (id = 0; id < priv->num_crtcs; id++)
     85		if (status & mdp4_crtc_vblank(priv->crtcs[id]))
     86			drm_handle_vblank(dev, id);
     87
     88	return IRQ_HANDLED;
     89}
     90
     91int mdp4_enable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
     92{
     93	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
     94
     95	mdp4_enable(mdp4_kms);
     96	mdp_update_vblank_mask(to_mdp_kms(kms),
     97			mdp4_crtc_vblank(crtc), true);
     98	mdp4_disable(mdp4_kms);
     99
    100	return 0;
    101}
    102
    103void mdp4_disable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
    104{
    105	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
    106
    107	mdp4_enable(mdp4_kms);
    108	mdp_update_vblank_mask(to_mdp_kms(kms),
    109			mdp4_crtc_vblank(crtc), false);
    110	mdp4_disable(mdp4_kms);
    111}