/*      $NetBSD: ata_raid_nvidia.c,v 1.5 2022/03/19 13:51:01 hannken Exp $      */

/*-
* Copyright (c) 2000 - 2008 S�ren Schmidt <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer,
*    without modification, immediately at the beginning of the file.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/*
* Support for parsing nVIDIA MediaShield RAID controller configuration blocks.
*
* Adapted to NetBSD by Tatoku Ogaito ([email protected])
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ata_raid_nvidia.c,v 1.5 2022/03/19 13:51:01 hannken Exp $");

#include <sys/param.h>
#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/fcntl.h>
#include <sys/vnode.h>
#include <sys/kauth.h>

#include <miscfs/specfs/specdev.h>

#include <dev/ata/atareg.h>
#include <dev/ata/atavar.h>
#include <dev/ata/wdvar.h>

#include <dev/ata/ata_raidreg.h>
#include <dev/ata/ata_raidvar.h>

#ifdef ATA_RAID_DEBUG
#define DPRINTF(x)      printf x
#else
#define DPRINTF(x)      /* nothing */
#endif

#ifdef ATA_RAID_DEBUG
static const char *
ata_raid_nvidia_type(int type)
{
       static char buffer[16];

       switch (type) {
       case NV_T_SPAN:     return "SPAN";
       case NV_T_RAID0:    return "RAID0";
       case NV_T_RAID1:    return "RAID1";
       case NV_T_RAID3:    return "RAID3";
       case NV_T_RAID5:    return "RAID5";
       case NV_T_RAID01:   return "RAID0+1";
       default:
               snprintf(buffer, sizeof(buffer), "UNKNOWN 0x%02x", type);
               return buffer;
   }
}

static void
ata_raid_nvidia_print_info(struct nvidia_raid_conf *info)
{
   printf("******** ATA nVidia MediaShield Metadata ********\n");
   printf("nvidia_id           <%.8s>\n", info->nvidia_id);
   printf("config_size         %d\n", info->config_size);
   printf("checksum            0x%08x\n", info->checksum);
   printf("version             0x%04x\n", info->version);
   printf("disk_number         %d\n", info->disk_number);
   printf("dummy_0             0x%02x\n", info->dummy_0);
   printf("total_sectors       %d\n", info->total_sectors);
   printf("sectors_size        %d\n", info->sector_size);
   printf("serial              %.16s\n", info->serial);
   printf("revision            %.4s\n", info->revision);
   printf("dummy_1             0x%08x\n", info->dummy_1);
   printf("magic_0             0x%08x\n", info->magic_0);
   printf("magic_1             0x%016jx\n", info->magic_1);
   printf("magic_2             0x%016jx\n", info->magic_2);
   printf("flags               0x%02x\n", info->flags);
   printf("array_width         %d\n", info->array_width);
   printf("total_disks         %d\n", info->total_disks);
   printf("dummy_2             0x%02x\n", info->dummy_2);
   printf("type                %s\n", ata_raid_nvidia_type(info->type));
   printf("dummy_3             0x%04x\n", info->dummy_3);
   printf("stripe_sectors      %d\n", info->stripe_sectors);
   printf("stripe_bytes        %d\n", info->stripe_bytes);
   printf("stripe_shift        %d\n", info->stripe_shift);
   printf("stripe_mask         0x%08x\n", info->stripe_mask);
   printf("stripe_sizesectors  %d\n", info->stripe_sizesectors);
   printf("stripe_sizebytes    %d\n", info->stripe_sizebytes);
   printf("rebuild_lba         %d\n", info->rebuild_lba);
   printf("dummy_4             0x%08x\n", info->dummy_4);
   printf("dummy_5             0x%08x\n", info->dummy_5);
   printf("status              0x%08x\n", info->status);
   printf("=================================================\n");
}
#endif

int
ata_raid_read_config_nvidia(struct wd_softc *sc)
{
       struct dk_softc *dksc = &sc->sc_dksc;
       struct nvidia_raid_conf *info;
       struct vnode *vp;
       int bmajor, error, count;
       dev_t dev;
       uint32_t cksum, *ckptr;
       struct ataraid_array_info *aai;
       struct ataraid_disk_info *adi;
       static struct _arrayno {
         uint64_t magic1;
         uint64_t magic2;
         struct _arrayno *next;
       } arrayno = { 0, 0, NULL}, *anptr;

       info = kmem_zalloc(sizeof(*info), KM_SLEEP);

       bmajor = devsw_name2blk(dksc->sc_xname, NULL, 0);

       /* Get a vnode for the raw partition of this disk. */
       dev = MAKEDISKDEV(bmajor, device_unit(dksc->sc_dev), RAW_PART);
       error = bdevvp(dev, &vp);
       if (error)
               goto out;

       vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
       error = VOP_OPEN(vp, FREAD, NOCRED);
       if (error) {
               vput(vp);
               goto out;
       }

       error = ata_raid_config_block_rw(vp, NVIDIA_LBA(sc), info,
           sizeof(*info), B_READ);
       VOP_CLOSE(vp, FREAD, NOCRED);
       vput(vp);
       if (error) {
               aprint_error_dev(dksc->sc_dev,
                   "error %d reading nVidia MediaShield config block\n", error);
               goto out;
       }

#ifdef ATA_RAID_DEBUG
       ata_raid_nvidia_print_info(info);
#endif

       /* Check the signature. */
       if (strncmp(info->nvidia_id, NV_MAGIC, strlen(NV_MAGIC)) != 0) {
               DPRINTF(("%s: nVidia signature check failed\n",
                   dksc->sc_xname));
               error = ESRCH;
               goto out;
       }

       /* check if the checksum is OK */
       for (cksum = 0, ckptr = (uint32_t *)info, count = 0; count < info->config_size;
            count++)
               cksum += *ckptr++;
       if (cksum) {
               DPRINTF(("%s: nVidia checksum failed (0x%02x)\n",
                        dksc->sc_xname, cksum));
               error = ESRCH;
               goto out;
       }

       /*
        * Lookup or allocate a new array info structure for
        * this array. Since nVidia raid information does not
        * provides array# directory, we must count the number.
        * The available traces are magic_1 and magic_2.
        */
       for (anptr = &arrayno, count = 0; anptr->next; anptr = anptr->next, count++) {
               if (anptr->magic1 == info->magic_1 &&
                   anptr->magic2 == info->magic_2)
           break;
       }
       if (anptr->next == NULL) {
               /* new array */
               anptr->magic1 = info->magic_1;
               anptr->magic2 = info->magic_2;
               anptr->next = kmem_zalloc(sizeof(arrayno), KM_SLEEP);
       }
       aai = ata_raid_get_array_info(ATA_RAID_TYPE_NVIDIA, count);

       aai->aai_status = AAI_S_READY;
       if (info->status & NV_S_DEGRADED)
               aai->aai_status |= AAI_S_DEGRADED;

       switch (info->type) {
       case NV_T_RAID0:
               aai->aai_level = AAI_L_RAID0;
               break;

       case NV_T_RAID1:
               aai->aai_level = AAI_L_RAID1;
               break;

       case NV_T_RAID5:
               aai->aai_level = AAI_L_RAID5;
               break;

       case NV_T_RAID01:
               aai->aai_level = AAI_L_RAID0 | AAI_L_RAID1;
               break;

       case NV_T_SPAN:
               aai->aai_level = AAI_L_SPAN;
               break;

       default:
               aprint_error_dev(dksc->sc_dev,
                        "unknown nVidia type 0x%02x\n", info->type);
               error = EINVAL;
               goto out;
       }

       aai->aai_type = ATA_RAID_TYPE_NVIDIA;
       aai->aai_interleave = info->stripe_sectors;
       aai->aai_width = info->array_width;

       aai->aai_ndisks = info->total_disks;
       aai->aai_capacity = info->total_sectors;
       aai->aai_heads = 255;
       aai->aai_sectors = 63;
       aai->aai_cylinders = aai->aai_capacity / (aai->aai_heads * aai->aai_sectors);
       aai->aai_offset = 0;
       aai->aai_reserved = 2;

       adi = &aai->aai_disks[info->disk_number];
       adi->adi_dev = dksc->sc_dev;
       adi->adi_status = ADI_S_ONLINE | ADI_S_ASSIGNED;
       adi->adi_sectors = aai->aai_capacity;
       adi->adi_compsize = aai->aai_capacity / info->array_width;

       error = 0;

out:
       kmem_free(info, sizeof(*info));
       return (error);
}

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