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usb: host: xhci-mem: Allow for interrupter clients to choose specific index

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Some clients may operate only on a specific XHCI interrupter instance.
Allow for the associated class driver to request for the interrupter that
it requires.

Tested-by: Puma Hsu <pumahsu@google.com>
Tested-by: Daehwan Jung <dh10.jung@samsung.com>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409194804.3773260-4-quic_wcheng@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wesley Cheng
2025-04-09 12:47:36 -07:00
committed by Greg Kroah-Hartman
parent 5beb4a53a1
commit fce5729549
4 changed files with 19 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/usb/host/xhci-mem.c
View File

@@ -2331,14 +2331,15 @@ xhci_add_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir,
struct xhci_interrupter *
xhci_create_secondary_interrupter(struct usb_hcd *hcd, unsigned int segs,
u32 imod_interval)
u32 imod_interval, unsigned int intr_num)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
struct xhci_interrupter *ir;
unsigned int i;
int err = -ENOSPC;
if (!xhci->interrupters || xhci->max_interrupters <= 1)
if (!xhci->interrupters || xhci->max_interrupters <= 1 ||
intr_num >= xhci->max_interrupters)
return NULL;
ir = xhci_alloc_interrupter(xhci, segs, GFP_KERNEL);
@@ -2346,15 +2347,18 @@ xhci_create_secondary_interrupter(struct usb_hcd *hcd, unsigned int segs,
return NULL;
spin_lock_irq(&xhci->lock);
/* Find available secondary interrupter, interrupter 0 is reserved for primary */
for (i = 1; i < xhci->max_interrupters; i++) {
if (xhci->interrupters[i] == NULL) {
err = xhci_add_interrupter(xhci, ir, i);
break;
if (!intr_num) {
/* Find available secondary interrupter, interrupter 0 is reserved for primary */
for (i = 1; i < xhci->max_interrupters; i++) {
if (!xhci->interrupters[i]) {
err = xhci_add_interrupter(xhci, ir, i);
break;
}
}
} else {
if (!xhci->interrupters[intr_num])
err = xhci_add_interrupter(xhci, ir, intr_num);
}
spin_unlock_irq(&xhci->lock);
if (err) {
@@ -2370,7 +2374,7 @@ xhci_create_secondary_interrupter(struct usb_hcd *hcd, unsigned int segs,
i, imod_interval);
xhci_dbg(xhci, "Add secondary interrupter %d, max interrupters %d\n",
i, xhci->max_interrupters);
ir->intr_num, xhci->max_interrupters);
return ir;
}

5
drivers/usb/host/xhci-sideband.c
View File

@@ -259,7 +259,7 @@ EXPORT_SYMBOL_GPL(xhci_sideband_get_event_buffer);
*/
int
xhci_sideband_create_interrupter(struct xhci_sideband *sb, int num_seg,
bool ip_autoclear, u32 imod_interval)
bool ip_autoclear, u32 imod_interval, int intr_num)
{
int ret = 0;
@@ -273,7 +273,8 @@ xhci_sideband_create_interrupter(struct xhci_sideband *sb, int num_seg,
}
sb->ir = xhci_create_secondary_interrupter(xhci_to_hcd(sb->xhci),
num_seg, imod_interval);
num_seg, imod_interval,
intr_num);
if (!sb->ir) {
ret = -ENOMEM;
goto out;

2
drivers/usb/host/xhci.h
View File

@@ -1853,7 +1853,7 @@ void xhci_free_container_ctx(struct xhci_hcd *xhci,
struct xhci_container_ctx *ctx);
struct xhci_interrupter *
xhci_create_secondary_interrupter(struct usb_hcd *hcd, unsigned int segs,
u32 imod_interval);
u32 imod_interval, unsigned int intr_num);
void xhci_remove_secondary_interrupter(struct usb_hcd
*hcd, struct xhci_interrupter *ir);
void xhci_skip_sec_intr_events(struct xhci_hcd *xhci,

2
include/linux/usb/xhci-sideband.h
View File

@@ -66,7 +66,7 @@ struct sg_table *
xhci_sideband_get_event_buffer(struct xhci_sideband *sb);
int
xhci_sideband_create_interrupter(struct xhci_sideband *sb, int num_seg,
bool ip_autoclear, u32 imod_interval);
bool ip_autoclear, u32 imod_interval, int intr_num);
void
xhci_sideband_remove_interrupter(struct xhci_sideband *sb);
int