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[src/trunk]: src/sys/dev/pci support multi-vector MSI-X
details: https://anonhg.NetBSD.org/src/rev/cc2baf5af9cb
branches: trunk
changeset: 446507:cc2baf5af9cb
user: jdolecek <jdolecek%NetBSD.org@localhost>
date: Sat Dec 08 15:31:30 2018 +0000
description:
support multi-vector MSI-X
tested and confirmed working by Masanobu SAITOH on C3000
diffstat:
sys/dev/pci/ahcisata_pci.c | 137 ++++++++++++++++++++++++++++++++++++--------
1 files changed, 112 insertions(+), 25 deletions(-)
diffs (211 lines):
diff -r 919acb490916 -r cc2baf5af9cb sys/dev/pci/ahcisata_pci.c
--- a/sys/dev/pci/ahcisata_pci.c Sat Dec 08 15:04:40 2018 +0000
+++ b/sys/dev/pci/ahcisata_pci.c Sat Dec 08 15:31:30 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: ahcisata_pci.c,v 1.49 2018/12/04 19:34:27 jdolecek Exp $ */
+/* $NetBSD: ahcisata_pci.c,v 1.50 2018/12/08 15:31:30 jdolecek Exp $ */
/*
* Copyright (c) 2006 Manuel Bouyer.
@@ -26,14 +26,14 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ahcisata_pci.c,v 1.49 2018/12/04 19:34:27 jdolecek Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ahcisata_pci.c,v 1.50 2018/12/08 15:31:30 jdolecek Exp $");
#ifdef _KERNEL_OPT
#include "opt_ahcisata_pci.h"
#endif
#include <sys/types.h>
-#include <sys/malloc.h>
+#include <sys/kmem.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
@@ -207,7 +207,8 @@
pci_chipset_tag_t sc_pc;
pcitag_t sc_pcitag;
pci_intr_handle_t *sc_pihp;
- void *sc_ih;
+ int sc_nintr;
+ void **sc_ih;
};
static int ahci_pci_has_quirk(pci_vendor_id_t, pci_product_id_t);
@@ -286,16 +287,105 @@
return ret;
}
+static int
+ahci_pci_intr_establish(struct ahci_softc *sc, int port)
+{
+ struct ahci_pci_softc *psc = (struct ahci_pci_softc *)sc;
+ device_t self = sc->sc_atac.atac_dev;
+ char intrbuf[PCI_INTRSTR_LEN];
+ char intr_xname[INTRDEVNAMEBUF];
+ const char *intrstr;
+ int vec;
+ int (*intr_handler)(void *);
+ void *intr_arg;
+
+ KASSERT(psc->sc_pihp != NULL);
+ KASSERT(psc->sc_nintr > 0);
+
+ snprintf(intr_xname, sizeof(intr_xname), "%s", device_xname(self));
+
+ if (psc->sc_nintr == 1 || sc->sc_ghc_mrsm) {
+ /* Only one interrupt, established on vector 0 */
+ intr_handler = ahci_intr;
+ intr_arg = sc;
+ vec = 0;
+
+ if (psc->sc_ih[vec] != NULL) {
+ /* Already established, nothing more to do */
+ goto out;
+ }
+
+ } else {
+ /*
+ * Theoretically AHCI device can have less MSI/MSI-X vectors
+ * than supported ports. Hardware is allowed to revert
+ * to single message MSI, but not required to do so.
+ * So handle the case when it did not revert to single MSI.
+ * In this case last available interrupt vector is used
+ * for port == max vector, and all further ports.
+ * This last vector must use the general interrupt handler,
+ * since it needs to be able to handle several ports.
+ * NOTE: such case was never actually observed yet
+ */
+ if (sc->sc_atac.atac_nchannels > psc->sc_nintr
+ && port >= (psc->sc_nintr - 1)) {
+ intr_handler = ahci_intr;
+ intr_arg = sc;
+ vec = psc->sc_nintr - 1;
+
+ if (psc->sc_ih[vec] != NULL) {
+ /* Already established, nothing more to do */
+ goto out;
+ }
+
+ if (port == vec) {
+ /* Print error once */
+ aprint_error_dev(self,
+ "port %d independant interrupt vector not "
+ "available, sharing with further ports",
+ port);
+ }
+ } else {
+ /* Vector according to port */
+ KASSERT(port < psc->sc_nintr);
+ KASSERT(psc->sc_ih[port] == NULL);
+ intr_handler = ahci_intr_port;
+ intr_arg = &sc->sc_channels[port];
+ vec = port;
+
+ snprintf(intr_xname, sizeof(intr_xname), "%s port%d",
+ device_xname(self), port);
+ }
+ }
+
+ intrstr = pci_intr_string(psc->sc_pc, psc->sc_pihp[vec], intrbuf,
+ sizeof(intrbuf));
+ psc->sc_ih[vec] = pci_intr_establish_xname(psc->sc_pc,
+ psc->sc_pihp[vec], IPL_BIO, intr_handler, intr_arg, intr_xname);
+ if (psc->sc_ih == NULL) {
+ aprint_error_dev(self, "couldn't establish interrupt");
+ if (intrstr != NULL)
+ aprint_error(" at %s", intrstr);
+ aprint_error("\n");
+ goto fail;
+ }
+ aprint_normal_dev(self, "interrupting at %s\n", intrstr);
+
+out:
+ return 0;
+
+fail:
+ return EAGAIN;
+}
+
static void
ahci_pci_attach(device_t parent, device_t self, void *aux)
{
struct pci_attach_args *pa = aux;
struct ahci_pci_softc *psc = device_private(self);
struct ahci_softc *sc = &psc->ah_sc;
- const char *intrstr;
bool ahci_cap_64bit;
bool ahci_bad_64bit;
- char intrbuf[PCI_INTRSTR_LEN];
sc->sc_atac.atac_dev = self;
@@ -314,29 +404,18 @@
int counts[PCI_INTR_TYPE_SIZE] = {
[PCI_INTR_TYPE_INTX] = 1,
[PCI_INTR_TYPE_MSI] = 1,
- [PCI_INTR_TYPE_MSIX] = 0, /* XXX not working */
+ [PCI_INTR_TYPE_MSIX] = -1,
};
/* Allocate and establish the interrupt. */
- if (pci_intr_alloc(pa, &psc->sc_pihp, counts, PCI_INTR_TYPE_MSI)) {
+ if (pci_intr_alloc(pa, &psc->sc_pihp, counts, PCI_INTR_TYPE_MSIX)) {
aprint_error_dev(self, "can't allocate handler\n");
goto fail;
}
- intrstr = pci_intr_string(pa->pa_pc, psc->sc_pihp[0], intrbuf,
- sizeof(intrbuf));
- psc->sc_ih = pci_intr_establish_xname(pa->pa_pc, psc->sc_pihp[0],
- IPL_BIO, ahci_intr, sc, device_xname(sc->sc_atac.atac_dev));
- if (psc->sc_ih == NULL) {
- pci_intr_release(pa->pa_pc, psc->sc_pihp, 1);
- psc->sc_ih = NULL;
- aprint_error_dev(self, "couldn't establish interrupt");
- if (intrstr != NULL)
- aprint_error(" at %s", intrstr);
- aprint_error("\n");
- goto fail;
- }
- aprint_normal_dev(self, "interrupting at %s\n", intrstr);
+ psc->sc_nintr = counts[pci_intr_type(pa->pa_pc, psc->sc_pihp[0])];
+ psc->sc_ih = kmem_zalloc(sizeof(void *) * psc->sc_nintr, KM_SLEEP);
+ sc->sc_intr_establish = ahci_pci_intr_establish;
sc->sc_dmat = pa->pa_dmat;
@@ -368,7 +447,7 @@
return;
fail:
if (psc->sc_pihp != NULL) {
- pci_intr_release(psc->sc_pc, psc->sc_pihp, 1);
+ pci_intr_release(psc->sc_pc, psc->sc_pihp, psc->sc_nintr);
psc->sc_pihp = NULL;
}
if (sc->sc_ahcis) {
@@ -405,12 +484,20 @@
pmf_device_deregister(dv);
if (psc->sc_ih != NULL) {
- pci_intr_disestablish(psc->sc_pc, psc->sc_ih);
+ for (int intr = 0; intr < psc->sc_nintr; intr++) {
+ if (psc->sc_ih[intr] != NULL) {
+ pci_intr_disestablish(psc->sc_pc,
+ psc->sc_ih[intr]);
+ psc->sc_ih[intr] = NULL;
+ }
+ }
+
+ kmem_free(psc->sc_ih, sizeof(void *) * psc->sc_nintr);
psc->sc_ih = NULL;
}
if (psc->sc_pihp != NULL) {
- pci_intr_release(psc->sc_pc, psc->sc_pihp, 1);
+ pci_intr_release(psc->sc_pc, psc->sc_pihp, psc->sc_nintr);
psc->sc_pihp = NULL;
}
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