PCI: Add pci_irq_type() to query the allocated interrupt typegrafted

Add a helper that returns PCI_IRQ_MSIX, PCI_IRQ_MSI, or PCI_IRQ_INTX
based on the interrupt type the PCI core selected after
pci_alloc_irq_vectors().

Several drivers already open-code this check against pdev->msix_enabled
and pdev->msi_enabled, or even open code this helper [1].

A common helper avoids the duplication and keeps drivers from accessing
the bitfield directly (see also [2]).

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: John Hubbard <jhubbard@nvidia.com>
Link: https://elixir.bootlin.com/linux/v7.1/source/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c#L196 [1]
Inspired-by: John Hubbard <jhubbard@nvidia.com>
Link: https://lore.kernel.org/all/DKKG2QM3YJYB.Z2H2B2UXJ75N@kernel.org/ [2]
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260813165234.620555-5-dakr@kernel.org
[ Add missing pci_irq_type() stub for CONFIG_PCI=n. ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

1 files changed, 620 insertions, 0 deletions

diff --git a/fs/afs/cmservice.c b/fs/afs/cmservice.c
new file mode 100644
index 000000000..db394f101
--- /dev/null
+++ b/fs/afs/cmservice.c
@@ -0,0 +1,620 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* AFS Cache Manager Service
+ *
+ * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/ip.h>
+#include "internal.h"
+#include "afs_cm.h"
+#include "protocol_yfs.h"
+#define RXRPC_TRACE_ONLY_DEFINE_ENUMS
+#include <trace/events/rxrpc.h>
+
+static int afs_deliver_cb_init_call_back_state(struct afs_call *);
+static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
+static int afs_deliver_cb_probe(struct afs_call *);
+static int afs_deliver_cb_callback(struct afs_call *);
+static int afs_deliver_cb_probe_uuid(struct afs_call *);
+static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
+static void afs_cm_destructor(struct afs_call *);
+static void SRXAFSCB_CallBack(struct work_struct *);
+static void SRXAFSCB_InitCallBackState(struct work_struct *);
+static void SRXAFSCB_Probe(struct work_struct *);
+static void SRXAFSCB_ProbeUuid(struct work_struct *);
+static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);
+
+static int afs_deliver_yfs_cb_callback(struct afs_call *);
+
+/*
+ * CB.CallBack operation type
+ */
+static const struct afs_call_type afs_SRXCBCallBack = {
+	.name		= "CB.CallBack",
+	.deliver	= afs_deliver_cb_callback,
+	.destructor	= afs_cm_destructor,
+	.work		= SRXAFSCB_CallBack,
+};
+
+/*
+ * CB.InitCallBackState operation type
+ */
+static const struct afs_call_type afs_SRXCBInitCallBackState = {
+	.name		= "CB.InitCallBackState",
+	.deliver	= afs_deliver_cb_init_call_back_state,
+	.destructor	= afs_cm_destructor,
+	.work		= SRXAFSCB_InitCallBackState,
+};
+
+/*
+ * CB.InitCallBackState3 operation type
+ */
+static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
+	.name		= "CB.InitCallBackState3",
+	.deliver	= afs_deliver_cb_init_call_back_state3,
+	.destructor	= afs_cm_destructor,
+	.work		= SRXAFSCB_InitCallBackState,
+};
+
+/*
+ * CB.Probe operation type
+ */
+static const struct afs_call_type afs_SRXCBProbe = {
+	.name		= "CB.Probe",
+	.deliver	= afs_deliver_cb_probe,
+	.destructor	= afs_cm_destructor,
+	.work		= SRXAFSCB_Probe,
+};
+
+/*
+ * CB.ProbeUuid operation type
+ */
+static const struct afs_call_type afs_SRXCBProbeUuid = {
+	.name		= "CB.ProbeUuid",
+	.deliver	= afs_deliver_cb_probe_uuid,
+	.destructor	= afs_cm_destructor,
+	.work		= SRXAFSCB_ProbeUuid,
+};
+
+/*
+ * CB.TellMeAboutYourself operation type
+ */
+static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
+	.name		= "CB.TellMeAboutYourself",
+	.deliver	= afs_deliver_cb_tell_me_about_yourself,
+	.destructor	= afs_cm_destructor,
+	.work		= SRXAFSCB_TellMeAboutYourself,
+};
+
+/*
+ * YFS CB.CallBack operation type
+ */
+static const struct afs_call_type afs_SRXYFSCB_CallBack = {
+	.name		= "YFSCB.CallBack",
+	.deliver	= afs_deliver_yfs_cb_callback,
+	.destructor	= afs_cm_destructor,
+	.work		= SRXAFSCB_CallBack,
+};
+
+/*
+ * route an incoming cache manager call
+ * - return T if supported, F if not
+ */
+bool afs_cm_incoming_call(struct afs_call *call)
+{
+	_enter("{%u, CB.OP %u}", call->service_id, call->operation_ID);
+
+	switch (call->operation_ID) {
+	case CBCallBack:
+		call->type = &afs_SRXCBCallBack;
+		return true;
+	case CBInitCallBackState:
+		call->type = &afs_SRXCBInitCallBackState;
+		return true;
+	case CBInitCallBackState3:
+		call->type = &afs_SRXCBInitCallBackState3;
+		return true;
+	case CBProbe:
+		call->type = &afs_SRXCBProbe;
+		return true;
+	case CBProbeUuid:
+		call->type = &afs_SRXCBProbeUuid;
+		return true;
+	case CBTellMeAboutYourself:
+		call->type = &afs_SRXCBTellMeAboutYourself;
+		return true;
+	case YFSCBCallBack:
+		if (call->service_id != YFS_CM_SERVICE)
+			return false;
+		call->type = &afs_SRXYFSCB_CallBack;
+		return true;
+	default:
+		return false;
+	}
+}
+
+/*
+ * Clean up a cache manager call.
+ */
+static void afs_cm_destructor(struct afs_call *call)
+{
+	kfree(call->buffer);
+	call->buffer = NULL;
+}
+
+/*
+ * Abort a service call from within an action function.
+ */
+static void afs_abort_service_call(struct afs_call *call, u32 abort_code, int error,
+				   enum rxrpc_abort_reason why)
+{
+	rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
+				abort_code, error, why);
+	afs_set_call_complete(call, error, 0);
+}
+
+/*
+ * The server supplied a list of callbacks that it wanted to break.
+ */
+static void SRXAFSCB_CallBack(struct work_struct *work)
+{
+	struct afs_call *call = container_of(work, struct afs_call, work);
+
+	_enter("");
+
+	/* We need to break the callbacks before sending the reply as the
+	 * server holds up change visibility till it receives our reply so as
+	 * to maintain cache coherency.
+	 */
+	if (call->server) {
+		trace_afs_server(call->server->debug_id,
+				 refcount_read(&call->server->ref),
+				 atomic_read(&call->server->active),
+				 afs_server_trace_callback);
+		afs_break_callbacks(call->server, call->count, call->request);
+	}
+
+	afs_send_empty_reply(call);
+	afs_put_call(call);
+	_leave("");
+}
+
+/*
+ * deliver request data to a CB.CallBack call
+ */
+static int afs_deliver_cb_callback(struct afs_call *call)
+{
+	struct afs_callback_break *cb;
+	__be32 *bp;
+	int ret, loop;
+
+	_enter("{%u}", call->unmarshall);
+
+	switch (call->unmarshall) {
+	case 0:
+		afs_extract_to_tmp(call);
+		call->unmarshall++;
+
+		/* extract the FID array and its count in two steps */
+		fallthrough;
+	case 1:
+		_debug("extract FID count");
+		ret = afs_extract_data(call, true);
+		if (ret < 0)
+			return ret;
+
+		call->count = ntohl(call->tmp);
+		_debug("FID count: %u", call->count);
+		if (call->count > AFSCBMAX)
+			return afs_protocol_error(call, afs_eproto_cb_fid_count);
+
+		call->buffer = kmalloc(array3_size(call->count, 3, 4),
+				       GFP_KERNEL);
+		if (!call->buffer)
+			return -ENOMEM;
+		afs_extract_to_buf(call, call->count * 3 * 4);
+		call->unmarshall++;
+
+		fallthrough;
+	case 2:
+		_debug("extract FID array");
+		ret = afs_extract_data(call, true);
+		if (ret < 0)
+			return ret;
+
+		_debug("unmarshall FID array");
+		call->request = kzalloc_objs(struct afs_callback_break,
+					     call->count);
+		if (!call->request)
+			return -ENOMEM;
+
+		cb = call->request;
+		bp = call->buffer;
+		for (loop = call->count; loop > 0; loop--, cb++) {
+			cb->fid.vid	= ntohl(*bp++);
+			cb->fid.vnode	= ntohl(*bp++);
+			cb->fid.unique	= ntohl(*bp++);
+		}
+
+		afs_extract_to_tmp(call);
+		call->unmarshall++;
+
+		/* extract the callback array and its count in two steps */
+		fallthrough;
+	case 3:
+		_debug("extract CB count");
+		ret = afs_extract_data(call, true);
+		if (ret < 0)
+			return ret;
+
+		call->count2 = ntohl(call->tmp);
+		_debug("CB count: %u", call->count2);
+		if (call->count2 != call->count && call->count2 != 0)
+			return afs_protocol_error(call, afs_eproto_cb_count);
+		call->iter = &call->def_iter;
+		iov_iter_discard(&call->def_iter, ITER_DEST, call->count2 * 3 * 4);
+		call->unmarshall++;
+
+		fallthrough;
+	case 4:
+		_debug("extract discard %zu/%u",
+		       iov_iter_count(call->iter), call->count2 * 3 * 4);
+
+		ret = afs_extract_data(call, false);
+		if (ret < 0)
+			return ret;
+
+		call->unmarshall++;
+		fallthrough;
+
+	case 5:
+		break;
+	}
+
+	if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
+		return afs_io_error(call, afs_io_error_cm_reply);
+	return 0;
+}
+
+/*
+ * allow the fileserver to request callback state (re-)initialisation
+ */
+static void SRXAFSCB_InitCallBackState(struct work_struct *work)
+{
+	struct afs_call *call = container_of(work, struct afs_call, work);
+
+	_enter("{%p}", call->server);
+
+	if (call->server)
+		afs_init_callback_state(call->server);
+	afs_send_empty_reply(call);
+	afs_put_call(call);
+	_leave("");
+}
+
+/*
+ * deliver request data to a CB.InitCallBackState call
+ */
+static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
+{
+	_enter("");
+
+	afs_extract_discard(call, 0);
+	return afs_extract_data(call, false);
+}
+
+/*
+ * deliver request data to a CB.InitCallBackState3 call
+ */
+static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
+{
+	struct afs_uuid *r;
+	unsigned loop;
+	__be32 *b;
+	int ret;
+
+	_enter("{%u}", call->unmarshall);
+
+	switch (call->unmarshall) {
+	case 0:
+		call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
+		if (!call->buffer)
+			return -ENOMEM;
+		afs_extract_to_buf(call, 11 * sizeof(__be32));
+		call->unmarshall++;
+
+		fallthrough;
+	case 1:
+		_debug("extract UUID");
+		ret = afs_extract_data(call, false);
+		switch (ret) {
+		case 0:		break;
+		default:	return ret;
+		}
+
+		_debug("unmarshall UUID");
+		call->request = kmalloc_obj(struct afs_uuid);
+		if (!call->request)
+			return -ENOMEM;
+
+		b = call->buffer;
+		r = call->request;
+		r->time_low			= b[0];
+		r->time_mid			= htons(ntohl(b[1]));
+		r->time_hi_and_version		= htons(ntohl(b[2]));
+		r->clock_seq_hi_and_reserved 	= ntohl(b[3]);
+		r->clock_seq_low		= ntohl(b[4]);
+
+		for (loop = 0; loop < 6; loop++)
+			r->node[loop] = ntohl(b[loop + 5]);
+
+		call->unmarshall++;
+		fallthrough;
+
+	case 2:
+		break;
+	}
+
+	if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
+		return afs_io_error(call, afs_io_error_cm_reply);
+
+	if (!call->server) {
+		trace_afs_cm_no_server_u(call, call->request);
+		return 0;
+	}
+
+	if (memcmp(call->request, &call->server->_uuid, sizeof(call->server->_uuid)) != 0) {
+		pr_notice("Callback UUID does not match fileserver UUID\n");
+		trace_afs_cm_no_server_u(call, call->request);
+		return 0;
+	}
+
+	return 0;
+}
+
+/*
+ * allow the fileserver to see if the cache manager is still alive
+ */
+static void SRXAFSCB_Probe(struct work_struct *work)
+{
+	struct afs_call *call = container_of(work, struct afs_call, work);
+
+	_enter("");
+	afs_send_empty_reply(call);
+	afs_put_call(call);
+	_leave("");
+}
+
+/*
+ * deliver request data to a CB.Probe call
+ */
+static int afs_deliver_cb_probe(struct afs_call *call)
+{
+	int ret;
+
+	_enter("");
+
+	afs_extract_discard(call, 0);
+	ret = afs_extract_data(call, false);
+	if (ret < 0)
+		return ret;
+
+	if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
+		return afs_io_error(call, afs_io_error_cm_reply);
+	return 0;
+}
+
+/*
+ * Allow the fileserver to quickly find out if the cache manager has been
+ * rebooted.
+ */
+static void SRXAFSCB_ProbeUuid(struct work_struct *work)
+{
+	struct afs_call *call = container_of(work, struct afs_call, work);
+	struct afs_uuid *r = call->request;
+
+	_enter("");
+
+	if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)
+		afs_send_empty_reply(call);
+	else
+		afs_abort_service_call(call, 1, 1, afs_abort_probeuuid_negative);
+
+	afs_put_call(call);
+	_leave("");
+}
+
+/*
+ * deliver request data to a CB.ProbeUuid call
+ */
+static int afs_deliver_cb_probe_uuid(struct afs_call *call)
+{
+	struct afs_uuid *r;
+	unsigned loop;
+	__be32 *b;
+	int ret;
+
+	_enter("{%u}", call->unmarshall);
+
+	switch (call->unmarshall) {
+	case 0:
+		call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
+		if (!call->buffer)
+			return -ENOMEM;
+		afs_extract_to_buf(call, 11 * sizeof(__be32));
+		call->unmarshall++;
+
+		fallthrough;
+	case 1:
+		_debug("extract UUID");
+		ret = afs_extract_data(call, false);
+		switch (ret) {
+		case 0:		break;
+		default:	return ret;
+		}
+
+		_debug("unmarshall UUID");
+		call->request = kmalloc_obj(struct afs_uuid);
+		if (!call->request)
+			return -ENOMEM;
+
+		b = call->buffer;
+		r = call->request;
+		r->time_low			= b[0];
+		r->time_mid			= htons(ntohl(b[1]));
+		r->time_hi_and_version		= htons(ntohl(b[2]));
+		r->clock_seq_hi_and_reserved 	= ntohl(b[3]);
+		r->clock_seq_low		= ntohl(b[4]);
+
+		for (loop = 0; loop < 6; loop++)
+			r->node[loop] = ntohl(b[loop + 5]);
+
+		call->unmarshall++;
+		fallthrough;
+
+	case 2:
+		break;
+	}
+
+	if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
+		return afs_io_error(call, afs_io_error_cm_reply);
+	return 0;
+}
+
+/*
+ * allow the fileserver to ask about the cache manager's capabilities
+ */
+static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
+{
+	struct afs_call *call = container_of(work, struct afs_call, work);
+	int loop;
+
+	struct {
+		struct /* InterfaceAddr */ {
+			__be32 nifs;
+			__be32 uuid[11];
+			__be32 ifaddr[32];
+			__be32 netmask[32];
+			__be32 mtu[32];
+		} ia;
+		struct /* Capabilities */ {
+			__be32 capcount;
+			__be32 caps[1];
+		} cap;
+	} reply;
+
+	_enter("");
+
+	memset(&reply, 0, sizeof(reply));
+
+	reply.ia.uuid[0] = call->net->uuid.time_low;
+	reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));
+	reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));
+	reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);
+	reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);
+	for (loop = 0; loop < 6; loop++)
+		reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);
+
+	reply.cap.capcount = htonl(1);
+	reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
+	afs_send_simple_reply(call, &reply, sizeof(reply));
+	afs_put_call(call);
+	_leave("");
+}
+
+/*
+ * deliver request data to a CB.TellMeAboutYourself call
+ */
+static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
+{
+	int ret;
+
+	_enter("");
+
+	afs_extract_discard(call, 0);
+	ret = afs_extract_data(call, false);
+	if (ret < 0)
+		return ret;
+
+	if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
+		return afs_io_error(call, afs_io_error_cm_reply);
+	return 0;
+}
+
+/*
+ * deliver request data to a YFS CB.CallBack call
+ */
+static int afs_deliver_yfs_cb_callback(struct afs_call *call)
+{
+	struct afs_callback_break *cb;
+	struct yfs_xdr_YFSFid *bp;
+	size_t size;
+	int ret, loop;
+
+	_enter("{%u}", call->unmarshall);
+
+	switch (call->unmarshall) {
+	case 0:
+		afs_extract_to_tmp(call);
+		call->unmarshall++;
+
+		/* extract the FID array and its count in two steps */
+		fallthrough;
+	case 1:
+		_debug("extract FID count");
+		ret = afs_extract_data(call, true);
+		if (ret < 0)
+			return ret;
+
+		call->count = ntohl(call->tmp);
+		_debug("FID count: %u", call->count);
+		if (call->count > YFSCBMAX)
+			return afs_protocol_error(call, afs_eproto_cb_fid_count);
+
+		size = array_size(call->count, sizeof(struct yfs_xdr_YFSFid));
+		call->buffer = kmalloc(size, GFP_KERNEL);
+		if (!call->buffer)
+			return -ENOMEM;
+		afs_extract_to_buf(call, size);
+		call->unmarshall++;
+
+		fallthrough;
+	case 2:
+		_debug("extract FID array");
+		ret = afs_extract_data(call, false);
+		if (ret < 0)
+			return ret;
+
+		_debug("unmarshall FID array");
+		call->request = kzalloc_objs(struct afs_callback_break,
+					     call->count);
+		if (!call->request)
+			return -ENOMEM;
+
+		cb = call->request;
+		bp = call->buffer;
+		for (loop = call->count; loop > 0; loop--, cb++) {
+			cb->fid.vid	= xdr_to_u64(bp->volume);
+			cb->fid.vnode	= xdr_to_u64(bp->vnode.lo);
+			cb->fid.vnode_hi = ntohl(bp->vnode.hi);
+			cb->fid.unique	= ntohl(bp->vnode.unique);
+			bp++;
+		}
+
+		afs_extract_to_tmp(call);
+		call->unmarshall++;
+		fallthrough;
+
+	case 3:
+		break;
+	}
+
+	if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
+		return afs_io_error(call, afs_io_error_cm_reply);
+	return 0;
+}