linux-kernel - [PATCH v4 2/7] PCI: Add a helper to identify IOV resources

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Message-ID: <20241025215038.3125626-3-michal.winiarski@intel.com>
Date: Fri, 25 Oct 2024 23:50:33 +0200
From: Michał Winiarski <michal.winiarski@...el.com>
To: <linux-pci@...r.kernel.org>, <intel-xe@...ts.freedesktop.org>,
	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>, "Bjorn
 Helgaas" <bhelgaas@...gle.com>, Christian König
	<christian.koenig@....com>, Krzysztof Wilczyński
	<kw@...ux.com>, Ilpo Järvinen
	<ilpo.jarvinen@...ux.intel.com>
CC: Rodrigo Vivi <rodrigo.vivi@...el.com>, Michal Wajdeczko
	<michal.wajdeczko@...el.com>, Lucas De Marchi <lucas.demarchi@...el.com>,
	Thomas Hellström <thomas.hellstrom@...ux.intel.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard
	<mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, David Airlie
	<airlied@...il.com>, Simona Vetter <simona@...ll.ch>, Matt Roper
	<matthew.d.roper@...el.com>, Michał Winiarski
	<michal.winiarski@...el.com>
Subject: [PATCH v4 2/7] PCI: Add a helper to identify IOV resources

There are multiple places where special handling is required for IOV
resources.

Extract it to pci_resource_is_iov() helper and drop a few ifdefs.

Signed-off-by: Michał Winiarski <michal.winiarski@...el.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 drivers/pci/pci.h       | 19 +++++++++++++++----
 drivers/pci/setup-bus.c |  7 +++----
 drivers/pci/setup-res.c |  4 +---
 3 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 14d00ce45bfa9..48d345607e57e 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -580,6 +580,10 @@ void pci_iov_update_resource(struct pci_dev *dev, int resno);
 resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev, int resno);
 void pci_restore_iov_state(struct pci_dev *dev);
 int pci_iov_bus_range(struct pci_bus *bus);
+static inline bool pci_resource_is_iov(int resno)
+{
+	return resno >= PCI_IOV_RESOURCES && resno <= PCI_IOV_RESOURCE_END;
+}
 extern const struct attribute_group sriov_pf_dev_attr_group;
 extern const struct attribute_group sriov_vf_dev_attr_group;
 #else
@@ -589,12 +593,21 @@ static inline int pci_iov_init(struct pci_dev *dev)
 }
 static inline void pci_iov_release(struct pci_dev *dev) { }
 static inline void pci_iov_remove(struct pci_dev *dev) { }
+static inline void pci_iov_update_resource(struct pci_dev *dev, int resno) { }
+static inline resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev,
+							   int resno)
+{
+	return 0;
+}
 static inline void pci_restore_iov_state(struct pci_dev *dev) { }
 static inline int pci_iov_bus_range(struct pci_bus *bus)
 {
 	return 0;
 }
-
+static inline bool pci_resource_is_iov(int resno)
+{
+	return false;
+}
 #endif /* CONFIG_PCI_IOV */
 
 #ifdef CONFIG_PCIE_PTM
@@ -616,12 +629,10 @@ unsigned long pci_cardbus_resource_alignment(struct resource *);
 static inline resource_size_t pci_resource_alignment(struct pci_dev *dev,
 						     struct resource *res)
 {
-#ifdef CONFIG_PCI_IOV
 	int resno = res - dev->resource;
 
-	if (resno >= PCI_IOV_RESOURCES && resno <= PCI_IOV_RESOURCE_END)
+	if (pci_resource_is_iov(resno))
 		return pci_sriov_resource_alignment(dev, resno);
-#endif
 	if (dev->class >> 8 == PCI_CLASS_BRIDGE_CARDBUS)
 		return pci_cardbus_resource_alignment(res);
 	return resource_alignment(res);
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 23082bc0ca37a..ba293df10c050 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1093,17 +1093,16 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 			     (r->flags & mask) != type3))
 				continue;
 			r_size = resource_size(r);
-#ifdef CONFIG_PCI_IOV
+
 			/* Put SRIOV requested res to the optional list */
-			if (realloc_head && i >= PCI_IOV_RESOURCES &&
-					i <= PCI_IOV_RESOURCE_END) {
+			if (realloc_head && pci_resource_is_iov(i)) {
 				add_align = max(pci_resource_alignment(dev, r), add_align);
 				r->end = r->start - 1;
 				add_to_list(realloc_head, dev, r, r_size, 0 /* Don't care */);
 				children_add_size += r_size;
 				continue;
 			}
-#endif
+
 			/*
 			 * aligns[0] is for 1MB (since bridge memory
 			 * windows are always at least 1MB aligned), so
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index c6d933ddfd464..e2cf79253ebda 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -127,10 +127,8 @@ void pci_update_resource(struct pci_dev *dev, int resno)
 {
 	if (resno <= PCI_ROM_RESOURCE)
 		pci_std_update_resource(dev, resno);
-#ifdef CONFIG_PCI_IOV
-	else if (resno >= PCI_IOV_RESOURCES && resno <= PCI_IOV_RESOURCE_END)
+	else if (pci_resource_is_iov(resno))
 		pci_iov_update_resource(dev, resno);
-#endif
 }
 
 int pci_claim_resource(struct pci_dev *dev, int resource)
-- 
2.47.0