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usb: cdns3: Use dma_pool_* api to alloc trb pool 

Allocation of DMA coherent memory in atomic context using
dma_alloc_coherent() might fail on platforms with smaller
DMA region.

To fix it, dma_alloc_coherent() is replaced with dma_pool
API to allocate a smaller chunk of DMA coherent memory for
TRB rings.

Reported-by: Aswath Govindraju <a-govindraju@ti.com>
Signed-off-by: Sanket Parmar <sparmar@cadence.com>
Signed-off-by: Peter Chen <peter.chen@kernel.org>
This commit is contained in:
Sanket Parmar 2021-03-09 06:19:39 +01:00 committed by Peter Chen
parent 575dd7ece6
commit b9b1eae761
No known key found for this signature in database
GPG Key ID: 4859298150D671BB
2 changed files with 20 additions and 23 deletions
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40
drivers/usb/cdns3/cdns3-gadget.c
View File

@ -59,6 +59,7 @@
#include <linux/dma-mapping.h>
#include <linux/usb/gadget.h>
#include <linux/module.h>
#include <linux/dmapool.h>
#include <linux/iopoll.h>
#include "core.h"
@ -190,28 +191,12 @@ dma_addr_t cdns3_trb_virt_to_dma(struct cdns3_endpoint *priv_ep,
return priv_ep->trb_pool_dma + offset;
}
static int cdns3_ring_size(struct cdns3_endpoint *priv_ep)
{
switch (priv_ep->type) {
case USB_ENDPOINT_XFER_ISOC:
return TRB_ISO_RING_SIZE;
case USB_ENDPOINT_XFER_CONTROL:
return TRB_CTRL_RING_SIZE;
default:
if (priv_ep->use_streams)
return TRB_STREAM_RING_SIZE;
else
return TRB_RING_SIZE;
}
}
static void cdns3_free_trb_pool(struct cdns3_endpoint *priv_ep)
{
struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
if (priv_ep->trb_pool) {
dma_free_coherent(priv_dev->sysdev,
cdns3_ring_size(priv_ep),
dma_pool_free(priv_dev->eps_dma_pool,
priv_ep->trb_pool, priv_ep->trb_pool_dma);
priv_ep->trb_pool = NULL;
}
@ -226,7 +211,7 @@ static void cdns3_free_trb_pool(struct cdns3_endpoint *priv_ep)
int cdns3_allocate_trb_pool(struct cdns3_endpoint *priv_ep)
{
struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
int ring_size = cdns3_ring_size(priv_ep);
int ring_size = TRB_RING_SIZE;
int num_trbs = ring_size / TRB_SIZE;
struct cdns3_trb *link_trb;
@ -234,10 +219,10 @@ int cdns3_allocate_trb_pool(struct cdns3_endpoint *priv_ep)
cdns3_free_trb_pool(priv_ep);
if (!priv_ep->trb_pool) {
priv_ep->trb_pool = dma_alloc_coherent(priv_dev->sysdev,
ring_size,
&priv_ep->trb_pool_dma,
GFP_DMA32 | GFP_ATOMIC);
priv_ep->trb_pool = dma_pool_alloc(priv_dev->eps_dma_pool,
GFP_DMA32 | GFP_ATOMIC,
&priv_ep->trb_pool_dma);
if (!priv_ep->trb_pool)
return -ENOMEM;
@ -3113,6 +3098,7 @@ static void cdns3_gadget_exit(struct cdns *cdns)
dma_free_coherent(priv_dev->sysdev, 8, priv_dev->setup_buf,
priv_dev->setup_dma);
dma_pool_destroy(priv_dev->eps_dma_pool);
kfree(priv_dev->zlp_buf);
usb_put_gadget(&priv_dev->gadget);
@ -3185,6 +3171,14 @@ static int cdns3_gadget_start(struct cdns *cdns)
/* initialize endpoint container */
INIT_LIST_HEAD(&priv_dev->gadget.ep_list);
INIT_LIST_HEAD(&priv_dev->aligned_buf_list);
priv_dev->eps_dma_pool = dma_pool_create("cdns3_eps_dma_pool",
priv_dev->sysdev,
TRB_RING_SIZE, 8, 0);
if (!priv_dev->eps_dma_pool) {
dev_err(priv_dev->dev, "Failed to create TRB dma pool\n");
ret = -ENOMEM;
goto err1;
}
ret = cdns3_init_eps(priv_dev);
if (ret) {
@ -3235,6 +3229,8 @@ static int cdns3_gadget_start(struct cdns *cdns)
err2:
cdns3_free_all_eps(priv_dev);
err1:
dma_pool_destroy(priv_dev->eps_dma_pool);
usb_put_gadget(&priv_dev->gadget);
cdns->gadget_dev = NULL;
return ret;

1
drivers/usb/cdns3/cdns3-gadget.h
View File

@ -1298,6 +1298,7 @@ struct cdns3_device {
struct cdns3_usb_regs __iomem *regs;
struct dma_pool *eps_dma_pool;
struct usb_ctrlrequest *setup_buf;
dma_addr_t setup_dma;
void *zlp_buf;