git: bf40080762e9 - main - uart: Allow PCI quirk for not using MSI interrupts
Warner Losh
imp at FreeBSD.org
Thu Sep 30 20:35:26 UTC 2021
The branch main has been updated by imp:
URL: https://cgit.FreeBSD.org/src/commit/?id=bf40080762e939b44d4dd0fbfac5127f2a2562ce
commit bf40080762e939b44d4dd0fbfac5127f2a2562ce
Author: Warner Losh <imp at FreeBSD.org>
AuthorDate: 2021-09-30 20:15:32 +0000
Commit: Warner Losh <imp at FreeBSD.org>
CommitDate: 2021-09-30 20:15:32 +0000
uart: Allow PCI quirk for not using MSI interrupts
Some setups claim to have one MSI, but they don't actually work. Allow
these to be flagged.
Sponsored by: Netflix
Reviewed by: kbowling
Differential Revision: https://reviews.freebsd.org/D32229
---
sys/dev/uart/uart_bus_pci.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/sys/dev/uart/uart_bus_pci.c b/sys/dev/uart/uart_bus_pci.c
index 92046261f544..4090af0ea9a0 100644
--- a/sys/dev/uart/uart_bus_pci.c
+++ b/sys/dev/uart/uart_bus_pci.c
@@ -75,6 +75,9 @@ struct pci_id {
int regshft;
};
+#define PCI_NO_MSI 0x40000000
+#define PCI_RID_MASK 0x0000ffff
+
static const struct pci_id pci_ns8250_ids[] = {
{ 0x1028, 0x0008, 0xffff, 0, "Dell Remote Access Card III", 0x14,
128 * DEFAULT_RCLK },
@@ -171,7 +174,8 @@ static const struct pci_id pci_ns8250_ids[] = {
{ 0x8086, 0x8cbd, 0xffff, 0, "Intel Wildcat Point KT Controller", 0x10 },
{ 0x8086, 0x9c3d, 0xffff, 0, "Intel Lynx Point-LP HECI KT", 0x10 },
{ 0x8086, 0xa13d, 0xffff, 0,
- "100 Series/C230 Series Chipset Family KT Redirection", 0x10 },
+ "100 Series/C230 Series Chipset Family KT Redirection",
+ 0x10 | PCI_NO_MSI },
{ 0x9710, 0x9820, 0x1000, 1, "NetMos NM9820 Serial Port", 0x10 },
{ 0x9710, 0x9835, 0x1000, 1, "NetMos NM9835 Serial Port", 0x10 },
{ 0x9710, 0x9865, 0xa000, 0x1000, "NetMos NM9865 Serial Port", 0x10 },
@@ -227,7 +231,8 @@ uart_pci_probe(device_t dev)
return (ENXIO);
match:
- result = uart_bus_probe(dev, id->regshft, 0, id->rclk, id->rid, 0, 0);
+ result = uart_bus_probe(dev, id->regshft, 0, id->rclk,
+ id->rid & PCI_RID_MASK, 0, 0);
/* Bail out on error. */
if (result > 0)
return (result);
@@ -241,6 +246,7 @@ static int
uart_pci_attach(device_t dev)
{
struct uart_softc *sc;
+ const struct pci_id *id;
int count;
sc = device_get_softc(dev);
@@ -249,7 +255,9 @@ uart_pci_attach(device_t dev)
* Use MSI in preference to legacy IRQ if available. However, experience
* suggests this is only reliable when one MSI vector is advertised.
*/
- if (pci_msi_count(dev) == 1) {
+ id = uart_pci_match(dev, pci_ns8250_ids);
+ if ((id == NULL || (id->rid & PCI_NO_MSI) == 0) &&
+ pci_msi_count(dev) == 1) {
count = 1;
if (pci_alloc_msi(dev, &count) == 0) {
sc->sc_irid = 1;
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