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b0310c2f09
For HCs that have local memory, replace the current DMA API usage with a genalloc generic allocator to manage the mappings for these devices. To help users, introduce a new HCD API, usb_hcd_setup_local_mem() that will setup up the genalloc backing up the device local memory. It will be used in subsequent patches. This is in preparation for dropping the existing "coherent" dma mem declaration APIs. The current implementation was relying on a short circuit in the DMA API that in the end, was acting as an allocator for these type of devices. Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com> Tested-by: Fredrik Noring <noring@nocrew.org> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Christoph Hellwig <hch@lst.de>
162 lines
4.0 KiB
C
162 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-1.0+
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/*
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* OHCI HCD (Host Controller Driver) for USB.
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*
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* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
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* (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
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*
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* This file is licenced under the GPL.
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*/
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/*-------------------------------------------------------------------------*/
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/*
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* OHCI deals with three types of memory:
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* - data used only by the HCD ... kmalloc is fine
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* - async and periodic schedules, shared by HC and HCD ... these
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* need to use dma_pool or dma_alloc_coherent
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* - driver buffers, read/written by HC ... the hcd glue or the
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* device driver provides us with dma addresses
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*
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* There's also "register" data, which is memory mapped.
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* No memory seen by this driver (or any HCD) may be paged out.
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*/
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/*-------------------------------------------------------------------------*/
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static void ohci_hcd_init (struct ohci_hcd *ohci)
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{
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ohci->next_statechange = jiffies;
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spin_lock_init (&ohci->lock);
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INIT_LIST_HEAD (&ohci->pending);
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INIT_LIST_HEAD(&ohci->eds_in_use);
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}
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/*-------------------------------------------------------------------------*/
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static int ohci_mem_init (struct ohci_hcd *ohci)
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{
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/*
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* HCs with local memory allocate from localmem_pool so there's
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* no need to create the below dma pools.
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*/
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if (ohci_to_hcd(ohci)->localmem_pool)
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return 0;
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ohci->td_cache = dma_pool_create ("ohci_td",
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ohci_to_hcd(ohci)->self.controller,
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sizeof (struct td),
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32 /* byte alignment */,
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0 /* no page-crossing issues */);
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if (!ohci->td_cache)
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return -ENOMEM;
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ohci->ed_cache = dma_pool_create ("ohci_ed",
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ohci_to_hcd(ohci)->self.controller,
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sizeof (struct ed),
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16 /* byte alignment */,
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0 /* no page-crossing issues */);
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if (!ohci->ed_cache) {
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dma_pool_destroy (ohci->td_cache);
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return -ENOMEM;
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}
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return 0;
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}
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static void ohci_mem_cleanup (struct ohci_hcd *ohci)
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{
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dma_pool_destroy(ohci->td_cache);
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ohci->td_cache = NULL;
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dma_pool_destroy(ohci->ed_cache);
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ohci->ed_cache = NULL;
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}
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/*-------------------------------------------------------------------------*/
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/* ohci "done list" processing needs this mapping */
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static inline struct td *
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dma_to_td (struct ohci_hcd *hc, dma_addr_t td_dma)
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{
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struct td *td;
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td_dma &= TD_MASK;
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td = hc->td_hash [TD_HASH_FUNC(td_dma)];
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while (td && td->td_dma != td_dma)
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td = td->td_hash;
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return td;
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}
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/* TDs ... */
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static struct td *
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td_alloc (struct ohci_hcd *hc, gfp_t mem_flags)
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{
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dma_addr_t dma;
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struct td *td;
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struct usb_hcd *hcd = ohci_to_hcd(hc);
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if (hcd->localmem_pool)
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td = gen_pool_dma_zalloc(hcd->localmem_pool, sizeof(*td), &dma);
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else
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td = dma_pool_zalloc(hc->td_cache, mem_flags, &dma);
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if (td) {
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/* in case hc fetches it, make it look dead */
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td->hwNextTD = cpu_to_hc32 (hc, dma);
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td->td_dma = dma;
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/* hashed in td_fill */
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}
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return td;
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}
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static void
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td_free (struct ohci_hcd *hc, struct td *td)
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{
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struct td **prev = &hc->td_hash [TD_HASH_FUNC (td->td_dma)];
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struct usb_hcd *hcd = ohci_to_hcd(hc);
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while (*prev && *prev != td)
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prev = &(*prev)->td_hash;
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if (*prev)
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*prev = td->td_hash;
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else if ((td->hwINFO & cpu_to_hc32(hc, TD_DONE)) != 0)
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ohci_dbg (hc, "no hash for td %p\n", td);
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if (hcd->localmem_pool)
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gen_pool_free(hcd->localmem_pool, (unsigned long)td,
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sizeof(*td));
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else
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dma_pool_free(hc->td_cache, td, td->td_dma);
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}
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/*-------------------------------------------------------------------------*/
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/* EDs ... */
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static struct ed *
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ed_alloc (struct ohci_hcd *hc, gfp_t mem_flags)
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{
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dma_addr_t dma;
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struct ed *ed;
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struct usb_hcd *hcd = ohci_to_hcd(hc);
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if (hcd->localmem_pool)
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ed = gen_pool_dma_zalloc(hcd->localmem_pool, sizeof(*ed), &dma);
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else
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ed = dma_pool_zalloc(hc->ed_cache, mem_flags, &dma);
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if (ed) {
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INIT_LIST_HEAD (&ed->td_list);
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ed->dma = dma;
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}
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return ed;
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}
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static void
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ed_free (struct ohci_hcd *hc, struct ed *ed)
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{
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struct usb_hcd *hcd = ohci_to_hcd(hc);
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if (hcd->localmem_pool)
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gen_pool_free(hcd->localmem_pool, (unsigned long)ed,
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sizeof(*ed));
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else
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dma_pool_free(hc->ed_cache, ed, ed->dma);
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}
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