io/gfx_private/gfxp_segmap.c

fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat/*
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * CDDL HEADER START
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat *
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * The contents of this file are subject to the terms of the
b9ae6f870f313422d793ca2506497dd04c858bddrugrat * Common Development and Distribution License (the "License").
b9ae6f870f313422d793ca2506497dd04c858bddrugrat * You may not use this file except in compliance with the License.
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat *
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * or http://www.opensolaris.org/os/licensing.
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * See the License for the specific language governing permissions
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * and limitations under the License.
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat *
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * When distributing Covered Code, include this CDDL HEADER in each
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * If applicable, add the following below this CDDL HEADER, with the
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * fields enclosed by brackets "[]" replaced with your own identifying
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * information: Portions Copyright [yyyy] [name of copyright owner]
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat *
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * CDDL HEADER END
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat */
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat/*
b9ae6f870f313422d793ca2506497dd04c858bddrugrat * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * Use is subject to license terms.
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat */
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#pragma ident   "%Z%%M% %I% %E% SMI"
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/debug.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/types.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/param.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/time.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/buf.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/errno.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/systm.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/conf.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/signal.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <vm/page.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <vm/as.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <vm/hat.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <vm/seg.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <vm/seg_dev.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <vm/hat_i86.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/ddi.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/devops.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/sunddi.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/ddi_impldefs.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/fs/snode.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/pci.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include <sys/vmsystm.h>
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat#include "gfx_private.h"
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat/*
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * clone of ddi_segmap_setup(). Respects the requested cache
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * attributes so hat_devload() gives user space WC and
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat * UC mappings for system memory.
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat */
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat/*ARGSUSED*/
fc1821fee2e1f208a4b5ff3e229e97b87979208arugratint
fc1821fee2e1f208a4b5ff3e229e97b87979208arugratgfxp_ddi_segmap_setup(dev_t dev, off_t offset, struct as *as, caddr_t *addrp,
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    off_t len, uint_t prot, uint_t maxprot, uint_t flags, cred_t *cred,
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    ddi_device_acc_attr_t *accattrp, uint_t rnumber)
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat{
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    struct segdev_crargs dev_a;
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    int (*mapfunc)(dev_t dev, off_t off, int prot);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    uint_t hat_attr;
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    pfn_t pfn;
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    int error, i;
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    if ((mapfunc = devopsp[getmajor(dev)]->devo_cb_ops->cb_mmap) == nodev)
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        return (ENODEV);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    /*
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat     * Character devices that support the d_mmap
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat     * interface can only be mmap'ed shared.
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat     */
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    if ((flags & MAP_TYPE) != MAP_SHARED)
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        return (EINVAL);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    /*
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat     * Check that this region is indeed mappable on this platform.
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat     * Use the mapping function.
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat     */
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    if (ddi_device_mapping_check(dev, accattrp, rnumber, &hat_attr) == -1)
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        return (ENXIO);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    if (accattrp != NULL) {
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        switch (accattrp->devacc_attr_dataorder) {
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        case DDI_STRICTORDER_ACC:
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat            /* Want UC */
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat            hat_attr &= ~HAT_ORDER_MASK;
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat            hat_attr |= (HAT_STRICTORDER | HAT_PLAT_NOCACHE);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat            break;
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        case DDI_MERGING_OK_ACC:
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat            /* Want WC */
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat            hat_attr &= ~HAT_ORDER_MASK;
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat            hat_attr |= (HAT_MERGING_OK | HAT_PLAT_NOCACHE);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat            break;
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        }
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    }
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    /*
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat     * Check to ensure that the entire range is
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat     * legal and we are not trying to map in
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat     * more than the device will let us.
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat     */
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    for (i = 0; i < len; i += PAGESIZE) {
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        if (i == 0) {
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat            /*
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat             * Save the pfn at offset here. This pfn will be
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat             * used later to get user address.
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat             */
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat            if ((pfn = (pfn_t)cdev_mmap(mapfunc, dev, offset,
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat                    maxprot)) == PFN_INVALID)
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat                return (ENXIO);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        } else {
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat            if (cdev_mmap(mapfunc, dev, offset + i, maxprot) ==
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat                PFN_INVALID)
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat                return (ENXIO);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        }
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    }
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    as_rangelock(as);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    if ((flags & MAP_FIXED) == 0) {
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        /*
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat         * Pick an address w/o worrying about
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat         * any vac alignment constraints.
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat         */
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        map_addr(addrp, len, ptob(pfn), 0, flags);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        if (*addrp == NULL) {
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat            as_rangeunlock(as);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat            return (ENOMEM);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        }
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    } else {
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        /*
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat         * User-specified address; blow away any previous mappings.
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat         */
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat        (void) as_unmap(as, *addrp, len);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    }
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    dev_a.mapfunc = mapfunc;
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    dev_a.dev = dev;
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    dev_a.offset = (offset_t)offset;
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    dev_a.type = flags & MAP_TYPE;
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    dev_a.prot = (uchar_t)prot;
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    dev_a.maxprot = (uchar_t)maxprot;
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    dev_a.hat_attr = hat_attr;
2b74c1dcee1ce5160892682ccfed76c50004acaarugrat#if DEBUG
2b74c1dcee1ce5160892682ccfed76c50004acaarugrat    dev_a.hat_flags = 0;
2b74c1dcee1ce5160892682ccfed76c50004acaarugrat#else
b9ae6f870f313422d793ca2506497dd04c858bddrugrat    dev_a.hat_flags = HAT_LOAD_LOCK;
2b74c1dcee1ce5160892682ccfed76c50004acaarugrat#endif
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    dev_a.devmap_data = NULL;
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    error = as_map(as, *addrp, len, segdev_create, &dev_a);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    as_rangeunlock(as);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat    return (error);
fc1821fee2e1f208a4b5ff3e229e97b87979208arugrat}