[PATCH v13 19/53] usb: host: xhci-mem: Allow for interrupter clients to choose specific index

Wesley Cheng
2024-02-03T02:37:47Z

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.

Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
---
drivers/usb/host/xhci-mem.c | 30 ++++++++++++++++--------------
drivers/usb/host/xhci-sideband.c | 4 ++--
drivers/usb/host/xhci.h | 2 +-
include/linux/usb/xhci-sideband.h | 2 +-
4 files changed, 20 insertions(+), 18 deletions(-)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index e4c13f056c1a..ae28dac7a747 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -2360,7 +2360,7 @@ xhci_add_interrupter(struct xhci_hcd *xhci, struct xhci_interrupter *ir,
}

struct xhci_interrupter *
-xhci_create_secondary_interrupter(struct usb_hcd *hcd, int num_seg)
+xhci_create_secondary_interrupter(struct usb_hcd *hcd, int num_seg, int intr_num)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
struct xhci_interrupter *ir;
@@ -2375,28 +2375,30 @@ xhci_create_secondary_interrupter(struct usb_hcd *hcd, int num_seg)
return NULL;

spin_lock_irq(&xhci->lock);
-
- /* Find available secondary interrupter, interrupter 0 is reserved for primary */
+ /* Find available secondary interrupter, interrupter 0 is reserverd 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 > 0 && i == intr_num) || intr_num <= 0) {
+ if (xhci->interrupters[i] == NULL) {
+ err = xhci_add_interrupter(xhci, ir, i);
+ if (err) {
+ spin_unlock_irq(&xhci->lock);
+ goto free_ir;
+ }
+ break;
+ }
}
}
-
spin_unlock_irq(&xhci->lock);

- if (err) {
- xhci_warn(xhci, "Failed to add secondary interrupter, max interrupters %d\n",
- xhci->max_interrupters);
- xhci_free_interrupter(xhci, ir);
- return NULL;
- }
-
xhci_dbg(xhci, "Add secondary interrupter %d, max interrupters %d\n",
i, xhci->max_interrupters);

return ir;
+
+free_ir:
+ xhci_free_interrupter(xhci, ir);
+
+ return NULL;
}
EXPORT_SYMBOL_GPL(xhci_create_secondary_interrupter);

diff --git a/drivers/usb/host/xhci-sideband.c b/drivers/usb/host/xhci-sideband.c
index 504a6f1586b5..3acbf23095e9 100644
--- a/drivers/usb/host/xhci-sideband.c
+++ b/drivers/usb/host/xhci-sideband.c
@@ -278,7 +278,7 @@ EXPORT_SYMBOL_GPL(xhci_sideband_enable_interrupt);
*/
int
xhci_sideband_create_interrupter(struct xhci_sideband *sb, int num_seg,
- bool ip_autoclear)
+ int intr_num, bool ip_autoclear)
{
int ret = 0;

@@ -292,7 +292,7 @@ xhci_sideband_create_interrupter(struct xhci_sideband *sb, int num_seg,
}

sb->ir = xhci_create_secondary_interrupter(xhci_to_hcd(sb->xhci),
- num_seg);
+ num_seg, intr_num);
if (!sb->ir) {
ret = -ENOMEM;
goto out;
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 96f9d1b38ff5..60abbc4103fd 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1836,7 +1836,7 @@ struct xhci_container_ctx *xhci_alloc_container_ctx(struct xhci_hcd *xhci,
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, int num_seg);
+xhci_create_secondary_interrupter(struct usb_hcd *hcd, int num_seg, 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,
diff --git a/include/linux/usb/xhci-sideband.h b/include/linux/usb/xhci-sideband.h
index a749ae307ba7..1026502739c5 100644
--- a/include/linux/usb/xhci-sideband.h
+++ b/include/linux/usb/xhci-sideband.h
@@ -58,7 +58,7 @@ int xhci_sideband_enable_interrupt(struct xhci_sideband *sb, u32 imod_interval);

int
xhci_sideband_create_interrupter(struct xhci_sideband *sb, int num_seg,
- bool ip_autoclear);
+ int intr_num, bool ip_autoclear);

void
xhci_sideband_remove_interrupter(struct xhci_sideband *sb);