diff options
Diffstat (limited to 'drivers/char/drm/drm_pci.c')
| -rw-r--r-- | drivers/char/drm/drm_pci.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/char/drm/drm_pci.c b/drivers/char/drm/drm_pci.c new file mode 100644 index 000000000000..192e8762571c --- /dev/null +++ b/drivers/char/drm/drm_pci.c @@ -0,0 +1,140 @@ +/* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */ +/** + * \file drm_pci.c + * \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 The wrappers here are so thin that they would be better off inlined.. + * + * \author Jose Fonseca <jrfonseca@tungstengraphics.com> + * \author Leif Delgass <ldelgass@retinalburn.net> + */ + +/* + * Copyright 2003 Jos�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 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); + + return address; +} +EXPORT_SYMBOL(drm_pci_alloc); + +/** + * \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 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 { + 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 + +} +EXPORT_SYMBOL(drm_pci_free); + +/*@}*/ |