USB: use genalloc for USB HCs with local memory

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>
This commit is contained in:
Laurentiu Tudor 2019-05-29 13:28:40 +03:00 committed by Christoph Hellwig
parent da83a72295
commit b0310c2f09
7 changed files with 102 additions and 9 deletions

View File

@ -45,6 +45,7 @@ config USB_ARCH_HAS_HCD
config USB
tristate "Support for Host-side USB"
depends on USB_ARCH_HAS_HCD
select GENERIC_ALLOCATOR
select USB_COMMON
select NLS # for UTF-8 strings
---help---

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@ -16,6 +16,7 @@
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/genalloc.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
@ -124,6 +125,9 @@ void *hcd_buffer_alloc(
if (size == 0)
return NULL;
if (hcd->localmem_pool)
return gen_pool_dma_alloc(hcd->localmem_pool, size, dma);
/* some USB hosts just use PIO */
if (!IS_ENABLED(CONFIG_HAS_DMA) ||
(!is_device_dma_capable(bus->sysdev) &&
@ -152,6 +156,11 @@ void hcd_buffer_free(
if (!addr)
return;
if (hcd->localmem_pool) {
gen_pool_free(hcd->localmem_pool, (unsigned long)addr, size);
return;
}
if (!IS_ENABLED(CONFIG_HAS_DMA) ||
(!is_device_dma_capable(bus->sysdev) &&
!(hcd->driver->flags & HCD_LOCAL_MEM))) {

View File

@ -29,6 +29,8 @@
#include <linux/workqueue.h>
#include <linux/pm_runtime.h>
#include <linux/types.h>
#include <linux/genalloc.h>
#include <linux/io.h>
#include <linux/phy/phy.h>
#include <linux/usb.h>
@ -3039,6 +3041,40 @@ usb_hcd_platform_shutdown(struct platform_device *dev)
}
EXPORT_SYMBOL_GPL(usb_hcd_platform_shutdown);
int usb_hcd_setup_local_mem(struct usb_hcd *hcd, phys_addr_t phys_addr,
dma_addr_t dma, size_t size)
{
int err;
void *local_mem;
hcd->localmem_pool = devm_gen_pool_create(hcd->self.sysdev, PAGE_SHIFT,
dev_to_node(hcd->self.sysdev),
dev_name(hcd->self.sysdev));
if (IS_ERR(hcd->localmem_pool))
return PTR_ERR(hcd->localmem_pool);
local_mem = devm_memremap(hcd->self.sysdev, phys_addr,
size, MEMREMAP_WC);
if (!local_mem)
return -ENOMEM;
/*
* Here we pass a dma_addr_t but the arg type is a phys_addr_t.
* It's not backed by system memory and thus there's no kernel mapping
* for it.
*/
err = gen_pool_add_virt(hcd->localmem_pool, (unsigned long)local_mem,
dma, size, dev_to_node(hcd->self.sysdev));
if (err < 0) {
dev_err(hcd->self.sysdev, "gen_pool_add_virt failed with %d\n",
err);
return err;
}
return 0;
}
EXPORT_SYMBOL_GPL(usb_hcd_setup_local_mem);
/*-------------------------------------------------------------------------*/
#if IS_ENABLED(CONFIG_USB_MON)

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@ -40,6 +40,7 @@
#include <linux/dmapool.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>
#include <linux/genalloc.h>
#include <asm/io.h>
#include <asm/irq.h>
@ -505,8 +506,15 @@ static int ohci_init (struct ohci_hcd *ohci)
timer_setup(&ohci->io_watchdog, io_watchdog_func, 0);
ohci->prev_frame_no = IO_WATCHDOG_OFF;
ohci->hcca = dma_alloc_coherent (hcd->self.controller,
sizeof(*ohci->hcca), &ohci->hcca_dma, GFP_KERNEL);
if (hcd->localmem_pool)
ohci->hcca = gen_pool_dma_alloc(hcd->localmem_pool,
sizeof(*ohci->hcca),
&ohci->hcca_dma);
else
ohci->hcca = dma_alloc_coherent(hcd->self.controller,
sizeof(*ohci->hcca),
&ohci->hcca_dma,
GFP_KERNEL);
if (!ohci->hcca)
return -ENOMEM;
@ -990,9 +998,14 @@ static void ohci_stop (struct usb_hcd *hcd)
remove_debug_files (ohci);
ohci_mem_cleanup (ohci);
if (ohci->hcca) {
dma_free_coherent (hcd->self.controller,
sizeof *ohci->hcca,
ohci->hcca, ohci->hcca_dma);
if (hcd->localmem_pool)
gen_pool_free(hcd->localmem_pool,
(unsigned long)ohci->hcca,
sizeof(*ohci->hcca));
else
dma_free_coherent(hcd->self.controller,
sizeof(*ohci->hcca),
ohci->hcca, ohci->hcca_dma);
ohci->hcca = NULL;
ohci->hcca_dma = 0;
}

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@ -36,6 +36,13 @@ static void ohci_hcd_init (struct ohci_hcd *ohci)
static int ohci_mem_init (struct ohci_hcd *ohci)
{
/*
* HCs with local memory allocate from localmem_pool so there's
* no need to create the below dma pools.
*/
if (ohci_to_hcd(ohci)->localmem_pool)
return 0;
ohci->td_cache = dma_pool_create ("ohci_td",
ohci_to_hcd(ohci)->self.controller,
sizeof (struct td),
@ -84,8 +91,12 @@ td_alloc (struct ohci_hcd *hc, gfp_t mem_flags)
{
dma_addr_t dma;
struct td *td;
struct usb_hcd *hcd = ohci_to_hcd(hc);
td = dma_pool_zalloc (hc->td_cache, mem_flags, &dma);
if (hcd->localmem_pool)
td = gen_pool_dma_zalloc(hcd->localmem_pool, sizeof(*td), &dma);
else
td = dma_pool_zalloc(hc->td_cache, mem_flags, &dma);
if (td) {
/* in case hc fetches it, make it look dead */
td->hwNextTD = cpu_to_hc32 (hc, dma);
@ -99,6 +110,7 @@ static void
td_free (struct ohci_hcd *hc, struct td *td)
{
struct td **prev = &hc->td_hash [TD_HASH_FUNC (td->td_dma)];
struct usb_hcd *hcd = ohci_to_hcd(hc);
while (*prev && *prev != td)
prev = &(*prev)->td_hash;
@ -106,7 +118,12 @@ td_free (struct ohci_hcd *hc, struct td *td)
*prev = td->td_hash;
else if ((td->hwINFO & cpu_to_hc32(hc, TD_DONE)) != 0)
ohci_dbg (hc, "no hash for td %p\n", td);
dma_pool_free (hc->td_cache, td, td->td_dma);
if (hcd->localmem_pool)
gen_pool_free(hcd->localmem_pool, (unsigned long)td,
sizeof(*td));
else
dma_pool_free(hc->td_cache, td, td->td_dma);
}
/*-------------------------------------------------------------------------*/
@ -117,8 +134,12 @@ ed_alloc (struct ohci_hcd *hc, gfp_t mem_flags)
{
dma_addr_t dma;
struct ed *ed;
struct usb_hcd *hcd = ohci_to_hcd(hc);
ed = dma_pool_zalloc (hc->ed_cache, mem_flags, &dma);
if (hcd->localmem_pool)
ed = gen_pool_dma_zalloc(hcd->localmem_pool, sizeof(*ed), &dma);
else
ed = dma_pool_zalloc(hc->ed_cache, mem_flags, &dma);
if (ed) {
INIT_LIST_HEAD (&ed->td_list);
ed->dma = dma;
@ -129,6 +150,12 @@ ed_alloc (struct ohci_hcd *hc, gfp_t mem_flags)
static void
ed_free (struct ohci_hcd *hc, struct ed *ed)
{
dma_pool_free (hc->ed_cache, ed, ed->dma);
struct usb_hcd *hcd = ohci_to_hcd(hc);
if (hcd->localmem_pool)
gen_pool_free(hcd->localmem_pool, (unsigned long)ed,
sizeof(*ed));
else
dma_pool_free(hc->ed_cache, ed, ed->dma);
}

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@ -385,6 +385,8 @@ struct ohci_hcd {
/*
* memory management for queue data structures
*
* @td_cache and @ed_cache are %NULL if &usb_hcd.localmem_pool is used.
*/
struct dma_pool *td_cache;
struct dma_pool *ed_cache;

View File

@ -216,6 +216,9 @@ struct usb_hcd {
#define HC_IS_RUNNING(state) ((state) & __ACTIVE)
#define HC_IS_SUSPENDED(state) ((state) & __SUSPEND)
/* memory pool for HCs having local memory, or %NULL */
struct gen_pool *localmem_pool;
/* more shared queuing code would be good; it should support
* smarter scheduling, handle transaction translators, etc;
* input size of periodic table to an interrupt scheduler.
@ -461,6 +464,8 @@ extern int usb_add_hcd(struct usb_hcd *hcd,
unsigned int irqnum, unsigned long irqflags);
extern void usb_remove_hcd(struct usb_hcd *hcd);
extern int usb_hcd_find_raw_port_number(struct usb_hcd *hcd, int port1);
int usb_hcd_setup_local_mem(struct usb_hcd *hcd, phys_addr_t phys_addr,
dma_addr_t dma, size_t size);
struct platform_device;
extern void usb_hcd_platform_shutdown(struct platform_device *dev);