Release 4.11 drivers/usb/host/ehci-mem.c

/*
 * Copyright (c) 2001 by David Brownell
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* this file is part of ehci-hcd.c */

/*-------------------------------------------------------------------------*/

/*
 * There's basically three types of memory:
 *      - data used only by the HCD ... kmalloc is fine
 *      - async and periodic schedules, shared by HC and HCD ... these
 *        need to use dma_pool or dma_alloc_coherent
 *      - driver buffers, read/written by HC ... single shot DMA mapped
 *
 * There's also "register" data (e.g. PCI or SOC), which is memory mapped.
 * No memory seen by this driver is pageable.
 */

/*-------------------------------------------------------------------------*/

/* Allocate the key transfer structures from the previously allocated pool */



static inline void ehci_qtd_init(struct ehci_hcd *ehci, struct ehci_qtd *qtd,
				  dma_addr_t dma)
{
	memset (qtd, 0, sizeof *qtd);
	qtd->qtd_dma = dma;
	qtd->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
	qtd->hw_next = EHCI_LIST_END(ehci);
	qtd->hw_alt_next = EHCI_LIST_END(ehci);
	INIT_LIST_HEAD (&qtd->qtd_list);
}

Contributors
Person
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CommitProp
David Brownell
60
81.08%
3
60.00%
Stefan Roese
11
14.86%
1
20.00%
Anatolij Gustschin
3
4.05%
1
20.00%
Total
74
100.00%
5
100.00%



static struct ehci_qtd *ehci_qtd_alloc (struct ehci_hcd *ehci, gfp_t flags)
{
	struct ehci_qtd		*qtd;
	dma_addr_t		dma;

	qtd = dma_pool_alloc (ehci->qtd_pool, flags, &dma);
	if (qtd != NULL) {
		ehci_qtd_init(ehci, qtd, dma);
	}
	return qtd;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
50
86.21%
1
14.29%
David Brownell
3
5.17%
2
28.57%
Stefan Roese
2
3.45%
1
14.29%
Al Viro
1
1.72%
1
14.29%
Deepak Saxena
1
1.72%
1
14.29%
Alexey Dobriyan
1
1.72%
1
14.29%
Total
58
100.00%
7
100.00%



static inline void ehci_qtd_free (struct ehci_hcd *ehci, struct ehci_qtd *qtd)
{
	dma_pool_free (ehci->qtd_pool, qtd, qtd->qtd_dma);
}


Contributors
Person
Tokens
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CommitProp
Linus Torvalds
29
96.67%
1
50.00%
Deepak Saxena
1
3.33%
1
50.00%
Total
30
100.00%
2
100.00%



static void qh_destroy(struct ehci_hcd *ehci, struct ehci_qh *qh)
{
	/* clean qtds first, and know this is not linked */
	if (!list_empty (&qh->qtd_list) || qh->qh_next.ptr) {
		ehci_dbg (ehci, "unused qh not empty!\n");
		BUG ();
	}
	if (qh->dummy)
		ehci_qtd_free (ehci, qh->dummy);
	dma_pool_free(ehci->qh_pool, qh->hw, qh->qh_dma);
	kfree(qh);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Greg Kroah-Hartman
67
82.72%
1
25.00%
Alek Du
7
8.64%
1
25.00%
Alan Stern
5
6.17%
1
25.00%
David Brownell
2
2.47%
1
25.00%
Total
81
100.00%
4
100.00%



static struct ehci_qh *ehci_qh_alloc (struct ehci_hcd *ehci, gfp_t flags)
{
	struct ehci_qh		*qh;
	dma_addr_t		dma;

	qh = kzalloc(sizeof *qh, GFP_ATOMIC);
	if (!qh)
		goto done;
	qh->hw = (struct ehci_qh_hw *)
		dma_pool_alloc(ehci->qh_pool, flags, &dma);
	if (!qh->hw)
		goto fail;
	memset(qh->hw, 0, sizeof *qh->hw);
	qh->qh_dma = dma;
	// INIT_LIST_HEAD (&qh->qh_list);
	INIT_LIST_HEAD (&qh->qtd_list);
	INIT_LIST_HEAD(&qh->unlink_node);

	/* dummy td enables safe urb queuing */
	qh->dummy = ehci_qtd_alloc (ehci, flags);
	if (qh->dummy == NULL) {
		ehci_dbg (ehci, "no dummy td\n");
		goto fail1;
	}
done:
	return qh;
fail1:
	dma_pool_free(ehci->qh_pool, qh->hw, qh->qh_dma);
fail:
	kfree(qh);
	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
72
40.91%
1
12.50%
Alek Du
50
28.41%
1
12.50%
David Brownell
42
23.86%
2
25.00%
Ming Lei
8
4.55%
1
12.50%
Deepak Saxena
2
1.14%
1
12.50%
Al Viro
1
0.57%
1
12.50%
Alexey Dobriyan
1
0.57%
1
12.50%
Total
176
100.00%
8
100.00%

/*-------------------------------------------------------------------------*/

/* The queue heads and transfer descriptors are managed from pools tied
 * to each of the "per device" structures.
 * This is the initialisation and cleanup code.
 */



static void ehci_mem_cleanup (struct ehci_hcd *ehci)
{
	if (ehci->async)
		qh_destroy(ehci, ehci->async);
	ehci->async = NULL;

	if (ehci->dummy)
		qh_destroy(ehci, ehci->dummy);
	ehci->dummy = NULL;

	/* DMA consistent memory and pools */
	dma_pool_destroy(ehci->qtd_pool);
	ehci->qtd_pool = NULL;
	dma_pool_destroy(ehci->qh_pool);
	ehci->qh_pool = NULL;
	dma_pool_destroy(ehci->itd_pool);
	ehci->itd_pool = NULL;
	dma_pool_destroy(ehci->sitd_pool);
	ehci->sitd_pool = NULL;

	if (ehci->periodic)
		dma_free_coherent (ehci_to_hcd(ehci)->self.controller,
			ehci->periodic_size * sizeof (u32),
			ehci->periodic, ehci->periodic_dma);
	ehci->periodic = NULL;

	/* shadow periodic table */
	kfree(ehci->pshadow);
	ehci->pshadow = NULL;
}

Contributors
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Tokens
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Commits
CommitProp
Linus Torvalds
101
62.73%
1
14.29%
Andiry Brienza
18
11.18%
1
14.29%
David Brownell
17
10.56%
1
14.29%
Deepak Saxena
9
5.59%
1
14.29%
Alan Stern
9
5.59%
2
28.57%
Mika Kukkonen
7
4.35%
1
14.29%
Total
161
100.00%
7
100.00%

/* remember to add cleanup code (above) if you add anything here */


static int ehci_mem_init (struct ehci_hcd *ehci, gfp_t flags)
{
	int i;

	/* QTDs for control/bulk/intr transfers */
	ehci->qtd_pool = dma_pool_create ("ehci_qtd",
			ehci_to_hcd(ehci)->self.controller,
			sizeof (struct ehci_qtd),
			32 /* byte alignment (for hw parts) */,
			4096 /* can't cross 4K */);
	if (!ehci->qtd_pool) {
		goto fail;
	}

	/* QHs for control/bulk/intr transfers */
	ehci->qh_pool = dma_pool_create ("ehci_qh",
			ehci_to_hcd(ehci)->self.controller,
			sizeof(struct ehci_qh_hw),
			32 /* byte alignment (for hw parts) */,
			4096 /* can't cross 4K */);
	if (!ehci->qh_pool) {
		goto fail;
	}
	ehci->async = ehci_qh_alloc (ehci, flags);
	if (!ehci->async) {
		goto fail;
	}

	/* ITD for high speed ISO transfers */
	ehci->itd_pool = dma_pool_create ("ehci_itd",
			ehci_to_hcd(ehci)->self.controller,
			sizeof (struct ehci_itd),
			32 /* byte alignment (for hw parts) */,
			4096 /* can't cross 4K */);
	if (!ehci->itd_pool) {
		goto fail;
	}

	/* SITD for full/low speed split ISO transfers */
	ehci->sitd_pool = dma_pool_create ("ehci_sitd",
			ehci_to_hcd(ehci)->self.controller,
			sizeof (struct ehci_sitd),
			32 /* byte alignment (for hw parts) */,
			4096 /* can't cross 4K */);
	if (!ehci->sitd_pool) {
		goto fail;
	}

	/* Hardware periodic table */
	ehci->periodic = (__le32 *)
		dma_alloc_coherent (ehci_to_hcd(ehci)->self.controller,
			ehci->periodic_size * sizeof(__le32),
			&ehci->periodic_dma, flags);
	if (ehci->periodic == NULL) {
		goto fail;
	}

	if (ehci->use_dummy_qh) {
		struct ehci_qh_hw	*hw;
		ehci->dummy = ehci_qh_alloc(ehci, flags);
		if (!ehci->dummy)
			goto fail;

		hw = ehci->dummy->hw;
		hw->hw_next = EHCI_LIST_END(ehci);
		hw->hw_qtd_next = EHCI_LIST_END(ehci);
		hw->hw_alt_next = EHCI_LIST_END(ehci);
		ehci->dummy->hw = hw;

		for (i = 0; i < ehci->periodic_size; i++)
			ehci->periodic[i] = cpu_to_hc32(ehci,
					ehci->dummy->qh_dma);
	} else {
		for (i = 0; i < ehci->periodic_size; i++)
			ehci->periodic[i] = EHCI_LIST_END(ehci);
	}

	/* software shadow of hardware table */
	ehci->pshadow = kcalloc(ehci->periodic_size, sizeof(void *), flags);
	if (ehci->pshadow != NULL)
		return 0;

fail:
	ehci_dbg (ehci, "couldn't init memory\n");
	ehci_mem_cleanup (ehci);
	return -ENOMEM;
}
Contributors
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CommitProp
Linus Torvalds
236
52.33%
1
7.69%
Andiry Brienza
108
23.95%
1
7.69%
David Brownell
53
11.75%
1
7.69%
Deepak Saxena
21
4.66%
1
7.69%
Alan Stern
20
4.43%
2
15.38%
Al Viro
3
0.67%
2
15.38%
Stefan Roese
3
0.67%
1
7.69%
Eric Sesterhenn / Snakebyte
3
0.67%
1
7.69%
Alexey Dobriyan
2
0.44%
1
7.69%
Vladimir Zapolskiy
1
0.22%
1
7.69%
Alek Du
1
0.22%
1
7.69%
Total
451
100.00%
13
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
494
47.50%
1
4.00%
David Brownell
179
17.21%
8
32.00%
Andiry Brienza
126
12.12%
1
4.00%
Greg Kroah-Hartman
67
6.44%
1
4.00%
Alek Du
58
5.58%
1
4.00%
Alan Stern
34
3.27%
3
12.00%
Deepak Saxena
34
3.27%
1
4.00%
Stefan Roese
17
1.63%
1
4.00%
Ming Lei
8
0.77%
1
4.00%
Mika Kukkonen
7
0.67%
1
4.00%
Al Viro
5
0.48%
2
8.00%
Alexey Dobriyan
4
0.38%
1
4.00%
Eric Sesterhenn / Snakebyte
3
0.29%
1
4.00%
Anatolij Gustschin
3
0.29%
1
4.00%
Vladimir Zapolskiy
1
0.10%
1
4.00%
Total
1040
100.00%
25
100.00%
Directory: drivers/usb/host

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