diff options
Diffstat (limited to 'linux-core/drm_pci.c')
| -rw-r--r-- | linux-core/drm_pci.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/linux-core/drm_pci.c b/linux-core/drm_pci.c new file mode 100644 index 00000000..28b53385 --- /dev/null +++ b/linux-core/drm_pci.c @@ -0,0 +1,170 @@ +/* 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. + */ + + +#define __NO_VERSION__ +#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 + +} + +/*@}*/ |