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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hpios.c (2052B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/******************************************************************************
      3
      4    AudioScience HPI driver
      5    Copyright (C) 1997-2012  AudioScience Inc. <support@audioscience.com>
      6
      7
      8HPI Operating System function implementation for Linux
      9
     10(C) Copyright AudioScience Inc. 1997-2003
     11******************************************************************************/
     12#define SOURCEFILE_NAME "hpios.c"
     13#include "hpi_internal.h"
     14#include "hpidebug.h"
     15#include <linux/delay.h>
     16#include <linux/sched.h>
     17
     18void hpios_delay_micro_seconds(u32 num_micro_sec)
     19{
     20	if ((usecs_to_jiffies(num_micro_sec) > 1) && !in_interrupt()) {
     21		/* MUST NOT SCHEDULE IN INTERRUPT CONTEXT! */
     22		schedule_timeout_uninterruptible(usecs_to_jiffies
     23			(num_micro_sec));
     24	} else if (num_micro_sec <= 2000)
     25		udelay(num_micro_sec);
     26	else
     27		mdelay(num_micro_sec / 1000);
     28
     29}
     30
     31/** Allocate an area of locked memory for bus master DMA operations.
     32
     33If allocation fails, return 1, and *pMemArea.size = 0
     34*/
     35u16 hpios_locked_mem_alloc(struct consistent_dma_area *p_mem_area, u32 size,
     36	struct pci_dev *pdev)
     37{
     38	/*?? any benefit in using managed dmam_alloc_coherent? */
     39	p_mem_area->vaddr =
     40		dma_alloc_coherent(&pdev->dev, size, &p_mem_area->dma_handle,
     41		GFP_KERNEL);
     42
     43	if (p_mem_area->vaddr) {
     44		HPI_DEBUG_LOG(DEBUG, "allocated %d bytes, dma 0x%x vma %p\n",
     45			size, (unsigned int)p_mem_area->dma_handle,
     46			p_mem_area->vaddr);
     47		p_mem_area->pdev = &pdev->dev;
     48		p_mem_area->size = size;
     49		return 0;
     50	} else {
     51		HPI_DEBUG_LOG(WARNING,
     52			"failed to allocate %d bytes locked memory\n", size);
     53		p_mem_area->size = 0;
     54		return 1;
     55	}
     56}
     57
     58u16 hpios_locked_mem_free(struct consistent_dma_area *p_mem_area)
     59{
     60	if (p_mem_area->size) {
     61		dma_free_coherent(p_mem_area->pdev, p_mem_area->size,
     62			p_mem_area->vaddr, p_mem_area->dma_handle);
     63		HPI_DEBUG_LOG(DEBUG, "freed %lu bytes, dma 0x%x vma %p\n",
     64			(unsigned long)p_mem_area->size,
     65			(unsigned int)p_mem_area->dma_handle,
     66			p_mem_area->vaddr);
     67		p_mem_area->size = 0;
     68		return 0;
     69	} else {
     70		return 1;
     71	}
     72}