summaryrefslogtreecommitdiff
path: root/bsd-core/drm_pci.c
AgeCommit message (Collapse)Author
2008-05-27[FreeBSD] Convert from drm_device_t to struct drm_device for consistency.Eric Anholt
2007-08-15BSD: Replace brief description in each file's first line with doxygen later on.Eric Anholt
The brief descriptions usually had the wrong filename in them.
2005-08-26- Don't try to allocate mappings of less than a PAGE_SIZE in MGA DMA code.Eric Anholt
- Comment out the "is this mapping/bufs in allocated AGP" bits in BSD because they break mga (which uses AGP allocation that doesn't track entries). It's not a security issue when we still have the related ioctls marked root-only. - Apply some power-of-two alignment restrictions to hopefully avoid some panicing in bad cases of drm_pci_alloc() on FreeBSD. - Add verbosity to some error handling that I found useful while debugging.
2005-04-26Convert BSD code to mostly use bus_dma, the dma abstraction for dealingEric Anholt
with IOMMUs and such. There is one usage of the forbidden vtophys() left in drm_scatter.c which will be fixed up soon. This required a KPI change for drm_pci_alloc/free() to return/use a drm_dma_handle_t that keeps track of os-specific bits, rather than just passing around the vaddr/busaddr/size. Submitted by: Tonnerre Lombard (partially) Tested on: FreeBSD: Rage128 AGP/PCI Linux: Savage4 AGP/PCI
2005-04-16Use /*- to begin license blocks in BSD code to reduce diffs against FreeBSDEric Anholt
CVS.
2004-11-07Now that the memory debug code is gone, and all 3 BSDs have M_ZERO, stopEric Anholt
using drm_alloc/drm_free in the core and instead use plain malloc/free.
2004-11-06Commit WIP of BSD conversion to core model. Compiles for r128, radeon, butEric Anholt
doesn't run yet. Moves the ioctl definitions for these two drivers back to the shared code -- they aren't OS-specific.
2003-10-19- SMPng lock the DRM. This is only partial -- there are a few code pathsEric Anholt
used by root (the X Server) which are not locked. However, it should deal with lost-IRQ issues on -current which I think people have been experiencing but I am unable to reproduce (though I understand why they would occur, because of a bug of mine). Note that most of the locking (DRM_LOCK()/UNLOCK()) is all covered by Giant still, so it doesn't matter yet. - Remove locking on FreeBSD-stable and NetBSD. These are covered by the fact that there is no reentrancy of the kernel except by interrupts, which are locked using spldrm()/splx() instead.
2003-04-26Add PCI DMA memory functions and make addbufs_pci and associated code useEric Anholt
it. To do this we need to save the bus address along with the virtual address in the seglist. Also fix some error handling and a few bits of whitespace.
generated by cgit v1.2.3 (git 2.25.1) at 2025-12-07 04:51:00 +0000
' href='#n175'>175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 
/**
 * \file drm_scatter.c
 * IOCTLs to manage scatter/gather memory
 *
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com
 *
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * 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
 * PRECISION INSIGHT AND/OR ITS SUPPLIERS 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/vmalloc.h>
#include "drmP.h"

#define DEBUG_SCATTER 0

static inline void *drm_vmalloc_dma(unsigned long size)
{
#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
	return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL | _PAGE_NO_CACHE);
#else
	return vmalloc_32(size);
#endif
}

void drm_sg_cleanup(struct drm_sg_mem *entry)
{
	struct page *page;
	int i;

	for (i = 0; i < entry->pages; i++) {
		page = entry->pagelist[i];
		if (page)
			ClearPageReserved(page);
	}

	vfree(entry->virtual);

	drm_free(entry->busaddr,
		 entry->pages * sizeof(*entry->busaddr), DRM_MEM_PAGES);
	drm_free(entry->pagelist,
		 entry->pages * sizeof(*entry->pagelist), DRM_MEM_PAGES);
	drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS);
}
EXPORT_SYMBOL(drm_sg_cleanup);

#ifdef _LP64
# define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1)))
#else
# define ScatterHandle(x) (unsigned int)(x)
#endif

int drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request)
{
	struct drm_sg_mem *entry;
	unsigned long pages, i, j;

	DRM_DEBUG("\n");

	if (!drm_core_check_feature(dev, DRIVER_SG))
		return -EINVAL;

	if (dev->sg)
		return -EINVAL;

	entry = drm_alloc(sizeof(*entry), DRM_MEM_SGLISTS);
	if (!entry)
		return -ENOMEM;

	memset(entry, 0, sizeof(*entry));
	pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
	DRM_DEBUG("size=%ld pages=%ld\n", request->size, pages);

	entry->pages = pages;
	entry->pagelist = drm_alloc(pages * sizeof(*entry->pagelist),
				    DRM_MEM_PAGES);
	if (!entry->pagelist) {
		drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS);
		return -ENOMEM;
	}

	memset(entry->pagelist, 0, pages * sizeof(*entry->pagelist));

	entry->busaddr = drm_alloc(pages * sizeof(*entry->busaddr),
				   DRM_MEM_PAGES);
	if (!entry->busaddr) {
		drm_free(entry->pagelist,
			 entry->pages * sizeof(*entry->pagelist),
			 DRM_MEM_PAGES);
		drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS);
		return -ENOMEM;
	}
	memset((void *)entry->busaddr, 0, pages * sizeof(*entry->busaddr));

	entry->virtual = drm_vmalloc_dma(pages << PAGE_SHIFT);
	if (!entry->virtual) {
		drm_free(entry->busaddr,
			 entry->pages * sizeof(*entry->busaddr), DRM_MEM_PAGES);
		drm_free(entry->pagelist,
			 entry->pages * sizeof(*entry->pagelist),
			 DRM_MEM_PAGES);
		drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS);
		return -ENOMEM;
	}

	/* This also forces the mapping of COW pages, so our page list
	 * will be valid.  Please don't remove it...
	 */
	memset(entry->virtual, 0, pages << PAGE_SHIFT);

	entry->handle = ScatterHandle((unsigned long)entry->virtual);

	DRM_DEBUG("handle  = %08lx\n", entry->handle);
	DRM_DEBUG("virtual = %p\n", entry->virtual);

	for (i = (unsigned long)entry->virtual, j = 0; j < pages;
	     i += PAGE_SIZE, j++) {
		entry->pagelist[j] = vmalloc_to_page((void *)i);
		if (!entry->pagelist[j])
			goto failed;
		SetPageReserved(entry->pagelist[j]);
	}

	request->handle = entry->handle;

	dev->sg = entry;

#if DEBUG_SCATTER
	/* Verify that each page points to its virtual address, and vice
	 * versa.
	 */
	{
		int error = 0;

		for (i = 0; i < pages; i++) {
			unsigned long *tmp;

			tmp = page_address(entry->pagelist[i]);
			for (j = 0;
			     j < PAGE_SIZE / sizeof(unsigned long);
			     j++, tmp++) {
				*tmp = 0xcafebabe;
			}
			tmp = (unsigned long *)((u8 *) entry->virtual +
						(PAGE_SIZE * i));
			for (j = 0;
			     j < PAGE_SIZE / sizeof(unsigned long);
			     j++, tmp++) {
				if (*tmp != 0xcafebabe && error == 0) {
					error = 1;
					DRM_ERROR("Scatter allocation error, "
						  "pagelist does not match "
						  "virtual mapping\n");
				}
			}
			tmp = page_address(entry->pagelist[i]);
			for (j = 0;
			     j < PAGE_SIZE / sizeof(unsigned long);
			     j++, tmp++) {
				*tmp = 0;
			}
		}
		if (error == 0)
			DRM_ERROR("Scatter allocation matches pagelist\n");
	}
#endif

	return 0;

      failed:
	drm_sg_cleanup(entry);
	return -ENOMEM;

}
EXPORT_SYMBOL(drm_sg_alloc);

int drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
		       struct drm_file *file_priv)
{
	struct drm_scatter_gather *request = data;

	return drm_sg_alloc(dev, request);

}

int drm_sg_free(struct drm_device *dev, void *data,
		struct drm_file *file_priv)
{
	struct drm_scatter_gather *request = data;
	struct drm_sg_mem *entry;

	if (!drm_core_check_feature(dev, DRIVER_SG))
		return -EINVAL;

	entry = dev->sg;
	dev->sg = NULL;

	if (!entry || entry->handle != request->handle)
		return -EINVAL;

	DRM_DEBUG("virtual  = %p\n", entry->virtual);

	drm_sg_cleanup(entry);

	return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-12-07 04:51:00 +0000