@@ -68,7 +68,7 @@ int hcd_buffer_create(struct usb_hcd *hcd)
if (!IS_ENABLED(CONFIG_HAS_DMA) ||
(!is_device_dma_capable(hcd->self.sysdev) &&
- !(hcd->driver->flags & HCD_LOCAL_MEM)))
+ !hcd->localmem_pool))
return 0;
for (i = 0; i < HCD_BUFFER_POOLS; i++) {
@@ -130,8 +130,7 @@ void *hcd_buffer_alloc(
/* some USB hosts just use PIO */
if (!IS_ENABLED(CONFIG_HAS_DMA) ||
- (!is_device_dma_capable(bus->sysdev) &&
- !(hcd->driver->flags & HCD_LOCAL_MEM))) {
+ !is_device_dma_capable(bus->sysdev)) {
*dma = ~(dma_addr_t) 0;
return kmalloc(size, mem_flags);
}
@@ -162,8 +161,7 @@ void hcd_buffer_free(
}
if (!IS_ENABLED(CONFIG_HAS_DMA) ||
- (!is_device_dma_capable(bus->sysdev) &&
- !(hcd->driver->flags & HCD_LOCAL_MEM))) {
+ !is_device_dma_capable(bus->sysdev)) {
kfree(addr);
return;
}
@@ -1347,14 +1347,14 @@ EXPORT_SYMBOL_GPL(usb_hcd_unlink_urb_from_ep);
* using regular system memory - like pci devices doing bus mastering.
*
* To support host controllers with limited dma capabilities we provide dma
- * bounce buffers. This feature can be enabled using the HCD_LOCAL_MEM flag.
+ * bounce buffers. This feature can be enabled by initializing
+ * hcd->localmem_pool using usb_hcd_setup_local_mem().
* For this to work properly the host controller code must first use the
* function dma_declare_coherent_memory() to point out which memory area
* that should be used for dma allocations.
*
- * The HCD_LOCAL_MEM flag then tells the usb code to allocate all data for
- * dma using dma_alloc_coherent() which in turn allocates from the memory
- * area pointed out with dma_declare_coherent_memory().
+ * The initialized hcd->localmem_pool then tells the usb code to allocate all
+ * data for dma using the genalloc API.
*
* So, to summarize...
*
@@ -1364,9 +1364,6 @@ EXPORT_SYMBOL_GPL(usb_hcd_unlink_urb_from_ep);
* (a) "normal" kernel memory is no good, and
* (b) there's not enough to share
*
- * - The only *portable* hook for such stuff in the
- * DMA framework is dma_declare_coherent_memory()
- *
* - So we use that, even though the primary requirement
* is that the memory be "local" (hence addressable
* by that device), not "coherent".
@@ -1533,7 +1530,7 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
urb->setup_dma))
return -EAGAIN;
urb->transfer_flags |= URB_SETUP_MAP_SINGLE;
- } else if (hcd->driver->flags & HCD_LOCAL_MEM) {
+ } else if (hcd->localmem_pool) {
ret = hcd_alloc_coherent(
urb->dev->bus, mem_flags,
&urb->setup_dma,
@@ -1603,7 +1600,7 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
else
urb->transfer_flags |= URB_DMA_MAP_SINGLE;
}
- } else if (hcd->driver->flags & HCD_LOCAL_MEM) {
+ } else if (hcd->localmem_pool) {
ret = hcd_alloc_coherent(
urb->dev->bus, mem_flags,
&urb->transfer_dma,
@@ -559,7 +559,7 @@ static int ehci_init(struct usb_hcd *hcd)
ehci->command = temp;
/* Accept arbitrarily long scatter-gather lists */
- if (!(hcd->driver->flags & HCD_LOCAL_MEM))
+ if (!hcd->localmem_pool)
hcd->self.sg_tablesize = ~0;
/* Prepare for unlinking active QHs */
@@ -4995,7 +4995,7 @@ static int hcd_fotg210_init(struct usb_hcd *hcd)
fotg210->command = temp;
/* Accept arbitrarily long scatter-gather lists */
- if (!(hcd->driver->flags & HCD_LOCAL_MEM))
+ if (!hcd->localmem_pool)
hcd->self.sg_tablesize = ~0;
return 0;
}
@@ -448,7 +448,7 @@ static int ohci_init (struct ohci_hcd *ohci)
struct usb_hcd *hcd = ohci_to_hcd(ohci);
/* Accept arbitrarily long scatter-gather lists */
- if (!(hcd->driver->flags & HCD_LOCAL_MEM))
+ if (!hcd->localmem_pool)
hcd->self.sg_tablesize = ~0;
if (distrust_firmware)
@@ -49,7 +49,7 @@ static const struct hc_driver ohci_sm501_hc_driver = {
* generic hardware linkage
*/
.irq = ohci_irq,
- .flags = HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM,
+ .flags = HCD_USB11 | HCD_MEMORY,
/*
* basic lifecycle operations
@@ -153,7 +153,8 @@ static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev)
* fine. This is however not always the case - buffers may be allocated
* using kmalloc() - so the usb core needs to be told that it must copy
* data into our local memory if the buffers happen to be placed in
- * regular memory. The HCD_LOCAL_MEM flag does just that.
+ * regular memory. A non-null hcd->localmem_pool initialized by the
+ * the call to usb_hcd_setup_local_mem() below does just that.
*/
if (usb_hcd_setup_local_mem(hcd, mem->start,
@@ -153,7 +153,7 @@ static const struct hc_driver ohci_tmio_hc_driver = {
/* generic hardware linkage */
.irq = ohci_irq,
- .flags = HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM,
+ .flags = HCD_USB11 | HCD_MEMORY,
/* basic lifecycle operations */
.start = ohci_tmio_start,
@@ -581,7 +581,7 @@ static int uhci_start(struct usb_hcd *hcd)
hcd->uses_new_polling = 1;
/* Accept arbitrarily long scatter-gather lists */
- if (!(hcd->driver->flags & HCD_LOCAL_MEM))
+ if (!hcd->localmem_pool)
hcd->self.sg_tablesize = ~0;
spin_lock_init(&uhci->lock);
@@ -256,7 +256,6 @@ struct hc_driver {
int flags;
#define HCD_MEMORY 0x0001 /* HC regs use memory (else I/O) */
-#define HCD_LOCAL_MEM 0x0002 /* HC needs local memory */
#define HCD_SHARED 0x0004 /* Two (or more) usb_hcds share HW */
#define HCD_USB11 0x0010 /* USB 1.1 */
#define HCD_USB2 0x0020 /* USB 2.0 */