mthca_mr.c

linux-2.6.15.6

	mr->mtt = mthca_alloc_mtt(dev, list_len);
	if (IS_ERR(mr->mtt))
		return PTR_ERR(mr->mtt);

	err = mthca_write_mtt(dev, mr->mtt, 0, buffer_list, list_len);
	if (err) {
		mthca_free_mtt(dev, mr->mtt);
		return err;
	}

	err = mthca_mr_alloc(dev, pd, buffer_size_shift, iova,
			     total_size, access, mr);
	if (err)
		mthca_free_mtt(dev, mr->mtt);

	return err;
}

/* Free mr or fmr */
static void mthca_free_region(struct mthca_dev *dev, u32 lkey)
{
	mthca_table_put(dev, dev->mr_table.mpt_table,
			key_to_hw_index(dev, lkey));

	mthca_free(&dev->mr_table.mpt_alloc, key_to_hw_index(dev, lkey));
}

void mthca_free_mr(struct mthca_dev *dev, struct mthca_mr *mr)
{
	int err;
	u8 status;

	might_sleep();

	err = mthca_HW2SW_MPT(dev, NULL,
			      key_to_hw_index(dev, mr->ibmr.lkey) &
			      (dev->limits.num_mpts - 1),
			      &status);
	if (err)
		mthca_warn(dev, "HW2SW_MPT failed (%d)\n", err);
	else if (status)
		mthca_warn(dev, "HW2SW_MPT returned status 0x%02x\n",
			   status);

	mthca_free_region(dev, mr->ibmr.lkey);
	mthca_free_mtt(dev, mr->mtt);
}

int mthca_fmr_alloc(struct mthca_dev *dev, u32 pd,
		    u32 access, struct mthca_fmr *mr)
{
	struct mthca_mpt_entry *mpt_entry;
	struct mthca_mailbox *mailbox;
	u64 mtt_seg;
	u32 key, idx;
	u8 status;
	int list_len = mr->attr.max_pages;
	int err = -ENOMEM;
	int i;

	might_sleep();

	if (mr->attr.page_size < 12 || mr->attr.page_size >= 32)
		return -EINVAL;

	/* For Arbel, all MTTs must fit in the same page. */
	if (mthca_is_memfree(dev) &&
	    mr->attr.max_pages * sizeof *mr->mem.arbel.mtts > PAGE_SIZE)
		return -EINVAL;

	mr->maps = 0;

	key = mthca_alloc(&dev->mr_table.mpt_alloc);
	if (key == -1)
		return -ENOMEM;

	idx = key & (dev->limits.num_mpts - 1);
	mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);

	if (mthca_is_memfree(dev)) {
		err = mthca_table_get(dev, dev->mr_table.mpt_table, key);
		if (err)
			goto err_out_mpt_free;

		mr->mem.arbel.mpt = mthca_table_find(dev->mr_table.mpt_table, key);
		BUG_ON(!mr->mem.arbel.mpt);
	} else
		mr->mem.tavor.mpt = dev->mr_table.tavor_fmr.mpt_base +
		       	sizeof *(mr->mem.tavor.mpt) * idx;

	mr->mtt = __mthca_alloc_mtt(dev, list_len, dev->mr_table.fmr_mtt_buddy);
	if (IS_ERR(mr->mtt))
		goto err_out_table;

	mtt_seg = mr->mtt->first_seg * MTHCA_MTT_SEG_SIZE;

	if (mthca_is_memfree(dev)) {
		mr->mem.arbel.mtts = mthca_table_find(dev->mr_table.mtt_table,
						      mr->mtt->first_seg);
		BUG_ON(!mr->mem.arbel.mtts);
	} else
		mr->mem.tavor.mtts = dev->mr_table.tavor_fmr.mtt_base + mtt_seg;

	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(mailbox))
		goto err_out_free_mtt;

	mpt_entry = mailbox->buf;

	mpt_entry->flags = cpu_to_be32(MTHCA_MPT_FLAG_SW_OWNS     |
				       MTHCA_MPT_FLAG_MIO         |
				       MTHCA_MPT_FLAG_REGION      |
				       access);

	mpt_entry->page_size = cpu_to_be32(mr->attr.page_size - 12);
	mpt_entry->key       = cpu_to_be32(key);
	mpt_entry->pd        = cpu_to_be32(pd);
	memset(&mpt_entry->start, 0,
	       sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, start));
	mpt_entry->mtt_seg   = cpu_to_be64(dev->mr_table.mtt_base + mtt_seg);

	if (0) {
		mthca_dbg(dev, "Dumping MPT entry %08x:\n", mr->ibmr.lkey);
		for (i = 0; i < sizeof (struct mthca_mpt_entry) / 4; ++i) {
			if (i % 4 == 0)
				printk("[%02x] ", i * 4);
			printk(" %08x", be32_to_cpu(((__be32 *) mpt_entry)[i]));
			if ((i + 1) % 4 == 0)
				printk("\n");
		}
	}

	err = mthca_SW2HW_MPT(dev, mailbox,
			      key & (dev->limits.num_mpts - 1),
			      &status);
	if (err) {
		mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
		goto err_out_mailbox_free;
	}
	if (status) {
		mthca_warn(dev, "SW2HW_MPT returned status 0x%02x\n",
			   status);
		err = -EINVAL;
		goto err_out_mailbox_free;
	}

	mthca_free_mailbox(dev, mailbox);
	return 0;

err_out_mailbox_free:
	mthca_free_mailbox(dev, mailbox);

err_out_free_mtt:
	mthca_free_mtt(dev, mr->mtt);

err_out_table:
	mthca_table_put(dev, dev->mr_table.mpt_table, key);

err_out_mpt_free:
	mthca_free(&dev->mr_table.mpt_alloc, mr->ibmr.lkey);
	return err;
}

int mthca_free_fmr(struct mthca_dev *dev, struct mthca_fmr *fmr)
{
	if (fmr->maps)
		return -EBUSY;

	mthca_free_region(dev, fmr->ibmr.lkey);
	mthca_free_mtt(dev, fmr->mtt);

	return 0;
}

static inline int mthca_check_fmr(struct mthca_fmr *fmr, u64 *page_list,
				  int list_len, u64 iova)
{
	int i, page_mask;

	if (list_len > fmr->attr.max_pages)
		return -EINVAL;

	page_mask = (1 << fmr->attr.page_size) - 1;

	/* We are getting page lists, so va must be page aligned. */
	if (iova & page_mask)
		return -EINVAL;

	/* Trust the user not to pass misaligned data in page_list */
	if (0)
		for (i = 0; i < list_len; ++i) {
			if (page_list[i] & ~page_mask)
				return -EINVAL;
		}

	if (fmr->maps >= fmr->attr.max_maps)
		return -EINVAL;

	return 0;
}


int mthca_tavor_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
			     int list_len, u64 iova)
{
	struct mthca_fmr *fmr = to_mfmr(ibfmr);
	struct mthca_dev *dev = to_mdev(ibfmr->device);
	struct mthca_mpt_entry mpt_entry;
	u32 key;
	int i, err;

	err = mthca_check_fmr(fmr, page_list, list_len, iova);
	if (err)
		return err;

	++fmr->maps;

	key = tavor_key_to_hw_index(fmr->ibmr.lkey);
	key += dev->limits.num_mpts;
	fmr->ibmr.lkey = fmr->ibmr.rkey = tavor_hw_index_to_key(key);

	writeb(MTHCA_MPT_STATUS_SW, fmr->mem.tavor.mpt);

	for (i = 0; i < list_len; ++i) {
		__be64 mtt_entry = cpu_to_be64(page_list[i] |
					       MTHCA_MTT_FLAG_PRESENT);
		mthca_write64_raw(mtt_entry, fmr->mem.tavor.mtts + i);
	}

	mpt_entry.lkey   = cpu_to_be32(key);
	mpt_entry.length = cpu_to_be64(list_len * (1ull << fmr->attr.page_size));
	mpt_entry.start  = cpu_to_be64(iova);

	__raw_writel((__force u32) mpt_entry.lkey, &fmr->mem.tavor.mpt->key);
	memcpy_toio(&fmr->mem.tavor.mpt->start, &mpt_entry.start,
		    offsetof(struct mthca_mpt_entry, window_count) -
		    offsetof(struct mthca_mpt_entry, start));

	writeb(MTHCA_MPT_STATUS_HW, fmr->mem.tavor.mpt);

	return 0;
}

int mthca_arbel_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
			     int list_len, u64 iova)
{
	struct mthca_fmr *fmr = to_mfmr(ibfmr);
	struct mthca_dev *dev = to_mdev(ibfmr->device);
	u32 key;
	int i, err;

	err = mthca_check_fmr(fmr, page_list, list_len, iova);
	if (err)
		return err;

	++fmr->maps;

	key = arbel_key_to_hw_index(fmr->ibmr.lkey);
	key += dev->limits.num_mpts;
	fmr->ibmr.lkey = fmr->ibmr.rkey = arbel_hw_index_to_key(key);

	*(u8 *) fmr->mem.arbel.mpt = MTHCA_MPT_STATUS_SW;

	wmb();

	for (i = 0; i < list_len; ++i)
		fmr->mem.arbel.mtts[i] = cpu_to_be64(page_list[i] |
						     MTHCA_MTT_FLAG_PRESENT);

	fmr->mem.arbel.mpt->key    = cpu_to_be32(key);
	fmr->mem.arbel.mpt->lkey   = cpu_to_be32(key);
	fmr->mem.arbel.mpt->length = cpu_to_be64(list_len * (1ull << fmr->attr.page_size));
	fmr->mem.arbel.mpt->start  = cpu_to_be64(iova);

	wmb();

	*(u8 *) fmr->mem.arbel.mpt = MTHCA_MPT_STATUS_HW;

	wmb();

	return 0;
}

void mthca_tavor_fmr_unmap(struct mthca_dev *dev, struct mthca_fmr *fmr)
{
	u32 key;

	if (!fmr->maps)
		return;

	key = tavor_key_to_hw_index(fmr->ibmr.lkey);
	key &= dev->limits.num_mpts - 1;
	fmr->ibmr.lkey = fmr->ibmr.rkey = tavor_hw_index_to_key(key);

	fmr->maps = 0;

	writeb(MTHCA_MPT_STATUS_SW, fmr->mem.tavor.mpt);
}

void mthca_arbel_fmr_unmap(struct mthca_dev *dev, struct mthca_fmr *fmr)
{
	u32 key;

	if (!fmr->maps)
		return;

	key = arbel_key_to_hw_index(fmr->ibmr.lkey);
	key &= dev->limits.num_mpts - 1;
	fmr->ibmr.lkey = fmr->ibmr.rkey = arbel_hw_index_to_key(key);

	fmr->maps = 0;

	*(u8 *) fmr->mem.arbel.mpt = MTHCA_MPT_STATUS_SW;
}

int __devinit mthca_init_mr_table(struct mthca_dev *dev)
{
	int err, i;

	err = mthca_alloc_init(&dev->mr_table.mpt_alloc,
			       dev->limits.num_mpts,
			       ~0, dev->limits.reserved_mrws);
	if (err)
		return err;

	if (!mthca_is_memfree(dev) &&
	    (dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN))
		dev->limits.fmr_reserved_mtts = 0;
	else
		dev->mthca_flags |= MTHCA_FLAG_FMR;

	err = mthca_buddy_init(&dev->mr_table.mtt_buddy,
			       fls(dev->limits.num_mtt_segs - 1));

	if (err)
		goto err_mtt_buddy;

	dev->mr_table.tavor_fmr.mpt_base = NULL;
	dev->mr_table.tavor_fmr.mtt_base = NULL;

	if (dev->limits.fmr_reserved_mtts) {
		i = fls(dev->limits.fmr_reserved_mtts - 1);

		if (i >= 31) {
			mthca_warn(dev, "Unable to reserve 2^31 FMR MTTs.\n");
			err = -EINVAL;
			goto err_fmr_mpt;
		}

		dev->mr_table.tavor_fmr.mpt_base =
		       	ioremap(dev->mr_table.mpt_base,
				(1 << i) * sizeof (struct mthca_mpt_entry));

		if (!dev->mr_table.tavor_fmr.mpt_base) {
			mthca_warn(dev, "MPT ioremap for FMR failed.\n");
			err = -ENOMEM;
			goto err_fmr_mpt;
		}

		dev->mr_table.tavor_fmr.mtt_base =
			ioremap(dev->mr_table.mtt_base,
				(1 << i) * MTHCA_MTT_SEG_SIZE);
		if (!dev->mr_table.tavor_fmr.mtt_base) {
			mthca_warn(dev, "MTT ioremap for FMR failed.\n");
			err = -ENOMEM;
			goto err_fmr_mtt;
		}

		err = mthca_buddy_init(&dev->mr_table.tavor_fmr.mtt_buddy, i);
		if (err)
			goto err_fmr_mtt_buddy;

		/* Prevent regular MRs from using FMR keys */
		err = mthca_buddy_alloc(&dev->mr_table.mtt_buddy, i);
		if (err)
			goto err_reserve_fmr;

		dev->mr_table.fmr_mtt_buddy =
		       	&dev->mr_table.tavor_fmr.mtt_buddy;
	} else
		dev->mr_table.fmr_mtt_buddy = &dev->mr_table.mtt_buddy;

	/* FMR table is always the first, take reserved MTTs out of there */
	if (dev->limits.reserved_mtts) {
		i = fls(dev->limits.reserved_mtts - 1);

		if (mthca_alloc_mtt_range(dev, i,
					  dev->mr_table.fmr_mtt_buddy) == -1) {
			mthca_warn(dev, "MTT table of order %d is too small.\n",
				  dev->mr_table.fmr_mtt_buddy->max_order);
			err = -ENOMEM;
			goto err_reserve_mtts;
		}
	}

	return 0;

err_reserve_mtts:
err_reserve_fmr:
	if (dev->limits.fmr_reserved_mtts)
		mthca_buddy_cleanup(&dev->mr_table.tavor_fmr.mtt_buddy);

err_fmr_mtt_buddy:
	if (dev->mr_table.tavor_fmr.mtt_base)
		iounmap(dev->mr_table.tavor_fmr.mtt_base);

err_fmr_mtt:
	if (dev->mr_table.tavor_fmr.mpt_base)
		iounmap(dev->mr_table.tavor_fmr.mpt_base);

err_fmr_mpt:
	mthca_buddy_cleanup(&dev->mr_table.mtt_buddy);

err_mtt_buddy:
	mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);

	return err;
}

void __devexit mthca_cleanup_mr_table(struct mthca_dev *dev)
{
	/* XXX check if any MRs are still allocated? */
	if (dev->limits.fmr_reserved_mtts)
		mthca_buddy_cleanup(&dev->mr_table.tavor_fmr.mtt_buddy);

	mthca_buddy_cleanup(&dev->mr_table.mtt_buddy);

	if (dev->mr_table.tavor_fmr.mtt_base)
		iounmap(dev->mr_table.tavor_fmr.mtt_base);
	if (dev->mr_table.tavor_fmr.mpt_base)
		iounmap(dev->mr_table.tavor_fmr.mpt_base);

	mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);
}