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/* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */
/**
* \file drm_pci.h
* \brief Functions and ioctls to manage PCI memory
*
* \warning These interfaces aren't stable yet.
*
* \todo Implement the remaining ioctl's for the PCI pools.
* \todo Add support to map these buffers.
* \todo The wrappers here are so thin that they would be better off inlined..
*
* \author José Fonseca <jrfonseca@tungstengraphics.com>
* \author Leif Delgass <ldelgass@retinalburn.net>
*/
/*
* Copyright 2003 José Fonseca.
* Copyright 2003 Leif Delgass.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <linux/pci.h>
#include "drmP.h"
/**********************************************************************/
/** \name PCI memory */
/*@{*/
/**
* \brief Allocate a PCI consistent memory block, for DMA.
*/
void *
DRM(pci_alloc)(drm_device_t *dev, size_t size, size_t align,
dma_addr_t maxaddr, dma_addr_t *busaddr)
{
void *address;
#if 0
unsigned long addr;
size_t sz;
#endif
#if DRM_DEBUG_MEMORY
int area = DRM_MEM_DMA;
spin_lock(&DRM(mem_lock));
if ((DRM(ram_used) >> PAGE_SHIFT)
> (DRM_RAM_PERCENT * DRM(ram_available)) / 100) {
spin_unlock(&DRM(mem_lock));
return 0;
}
spin_unlock(&DRM(mem_lock));
#endif
/* pci_alloc_consistent only guarantees alignment to the smallest
* PAGE_SIZE order which is greater than or equal to the requested size.
* Return NULL here for now to make sure nobody tries for larger alignment
*/
if (align > size)
return NULL;
if (pci_set_dma_mask( dev->pdev, maxaddr ) != 0) {
DRM_ERROR( "Setting pci dma mask failed\n" );
return NULL;
}
address = pci_alloc_consistent( dev->pdev, size, busaddr );
#if DRM_DEBUG_MEMORY
if (address == NULL) {
spin_lock(&DRM(mem_lock));
++DRM(mem_stats)[area].fail_count;
spin_unlock(&DRM(mem_lock));
return NULL;
}
spin_lock(&DRM(mem_lock));
++DRM(mem_stats)[area].succeed_count;
DRM(mem_stats)[area].bytes_allocated += size;
DRM(ram_used) += size;
spin_unlock(&DRM(mem_lock));
#else
if (address == NULL)
return NULL;
#endif
memset(address, 0, size);
#if 0
/* XXX - Is virt_to_page() legal for consistent mem? */
/* Reserve */
for (addr = (unsigned long)address, sz = size;
sz > 0;
addr += PAGE_SIZE, sz -= PAGE_SIZE) {
SetPageReserved(virt_to_page(addr));
}
#endif
return address;
}
/**
* \brief Free a PCI consistent memory block.
*/
void
DRM(pci_free)(drm_device_t *dev, size_t size, void *vaddr, dma_addr_t busaddr)
{
#if 0
unsigned long addr;
size_t sz;
#endif
#if DRM_DEBUG_MEMORY
int area = DRM_MEM_DMA;
int alloc_count;
int free_count;
#endif
if (!vaddr) {
#if DRM_DEBUG_MEMORY
DRM_MEM_ERROR(area, "Attempt to free address 0\n");
#endif
} else {
#if 0
/* XXX - Is virt_to_page() legal for consistent mem? */
/* Unreserve */
for (addr = (unsigned long)vaddr, sz = size;
sz > 0;
addr += PAGE_SIZE, sz -= PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
}
#endif
pci_free_consistent( dev->pdev, size, vaddr, busaddr );
}
#if DRM_DEBUG_MEMORY
spin_lock(&DRM(mem_lock));
free_count = ++DRM(mem_stats)[area].free_count;
alloc_count = DRM(mem_stats)[area].succeed_count;
DRM(mem_stats)[area].bytes_freed += size;
DRM(ram_used) -= size;
spin_unlock(&DRM(mem_lock));
if (free_count > alloc_count) {
DRM_MEM_ERROR(area,
"Excess frees: %d frees, %d allocs\n",
free_count, alloc_count);
}
#endif
}
/*@}*/
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