From: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
To: "Bjorn Helgaas" <bhelgaas@google.com>,
linux-pci@vger.kernel.org,
"Michał Winiarski" <michal.winiarski@intel.com>,
"Igor Mammedov" <imammedo@redhat.com>,
linux-kernel@vger.kernel.org
Cc: "Mika Westerberg" <mika.westerberg@linux.intel.com>,
"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
Subject: [PATCH 10/25] PCI: Add pci_resource_num() helper
Date: Mon, 16 Dec 2024 19:56:17 +0200 [thread overview]
Message-ID: <20241216175632.4175-11-ilpo.jarvinen@linux.intel.com> (raw)
In-Reply-To: <20241216175632.4175-1-ilpo.jarvinen@linux.intel.com>
A few places in PCI code, mainly in setup-bus.c, need to reverse lookup
the index of a resource in pci_dev's resource array. Create
pci_resource_num() helper to avoid repeating the pointer arithmetic
trick used to calculate the index.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
drivers/pci/pci.h | 24 +++++++++++++++++++++++-
drivers/pci/setup-bus.c | 10 +++++-----
2 files changed, 28 insertions(+), 6 deletions(-)
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 25bae4bfebea..0b722d158b6a 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -330,6 +330,28 @@ void pci_walk_bus_locked(struct pci_bus *top,
const char *pci_resource_name(struct pci_dev *dev, unsigned int i);
+/**
+ * pci_resource_num - Reverse lookup resource number from device resources
+ * @dev: PCI device
+ * @res: Resource to lookup index for (MUST be a @dev's resource)
+ *
+ * Perform reverse lookup to determine the resource number for @res within
+ * @dev resource array. NOTE: The caller is responsible for ensuring @res is
+ * among @dev's resources!
+ *
+ * Returns: resource number.
+ */
+static inline int pci_resource_num(const struct pci_dev *dev,
+ const struct resource *res)
+{
+ int resno = res - &dev->resource[0];
+
+ /* Passing a resource that is not among dev's resources? */
+ WARN_ON_ONCE(resno >= PCI_NUM_RESOURCES);
+
+ return resno;
+}
+
void pci_reassigndev_resource_alignment(struct pci_dev *dev);
void pci_disable_bridge_window(struct pci_dev *dev);
struct pci_bus *pci_bus_get(struct pci_bus *bus);
@@ -682,7 +704,7 @@ unsigned long pci_cardbus_resource_alignment(struct resource *);
static inline resource_size_t pci_resource_alignment(struct pci_dev *dev,
struct resource *res)
{
- int resno = res - dev->resource;
+ int resno = pci_resource_num(dev, res);
if (pci_resource_is_iov(resno))
return pci_sriov_resource_alignment(dev, resno);
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 63c134b087d5..8831365418d6 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -242,7 +242,7 @@ static void reassign_resources_sorted(struct list_head *realloc_head,
if (!found_match) /* Just skip */
continue;
- idx = res - &add_res->dev->resource[0];
+ idx = pci_resource_num(add_res->dev, res);
res_name = pci_resource_name(add_res->dev, idx);
add_size = add_res->add_size;
align = add_res->min_align;
@@ -284,7 +284,7 @@ static void assign_requested_resources_sorted(struct list_head *head,
list_for_each_entry(dev_res, head, list) {
res = dev_res->res;
- idx = res - &dev_res->dev->resource[0];
+ idx = pci_resource_num(dev_res->dev, res);
if (!resource_size(res))
continue;
@@ -2211,7 +2211,7 @@ void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus)
res->flags = fail_res->flags;
if (pci_is_bridge(fail_res->dev)) {
- idx = res - &fail_res->dev->resource[0];
+ idx = pci_resource_num(fail_res->dev, res);
if (idx >= PCI_BRIDGE_RESOURCES &&
idx <= PCI_BRIDGE_RESOURCE_END)
res->flags = 0;
@@ -2295,7 +2295,7 @@ void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
res->flags = fail_res->flags;
if (pci_is_bridge(fail_res->dev)) {
- idx = res - &fail_res->dev->resource[0];
+ idx = pci_resource_num(fail_res->dev, res);
if (idx >= PCI_BRIDGE_RESOURCES &&
idx <= PCI_BRIDGE_RESOURCE_END)
res->flags = 0;
@@ -2402,7 +2402,7 @@ int pci_reassign_bridge_resources(struct pci_dev *bridge, unsigned long type)
struct resource *res = dev_res->res;
bridge = dev_res->dev;
- i = res - bridge->resource;
+ i = pci_resource_num(bridge, res);
res->start = dev_res->start;
res->end = dev_res->end;
--
2.39.5
next prev parent reply other threads:[~2024-12-16 17:58 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-16 17:56 [PATCH 00/25] PCI: Resource fitting/assignment fixes and cleanups Ilpo Järvinen
2025-02-14 9:59 ` Xiaochun Lee
2024-12-16 17:56 ` [PATCH 01/25] PCI: Remove add_align overwrite unrelated to size0 Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 02/25] PCI: size0 is unrelated to add_align Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 03/25] PCI: Simplify size1 assignment logic Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 04/25] PCI: Optional bridge window size too may need relaxing Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 05/25] PCI: Fix old_size lower bound in calculate_iosize() too Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 06/25] PCI: Use SZ_* instead of literals in setup-bus.c Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 07/25] PCI: resource_set_range/size() conversions Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 08/25] PCI: Add a helper to identify IOV resources Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 09/25] PCI: Check resource_size() separately Ilpo Järvinen
2024-12-16 17:56 ` Ilpo Järvinen [this message]
2024-12-16 17:56 ` [PATCH 11/25] PCI: Add dev & res local variables to resource assignment funcs Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 12/25] PCI: Converge return paths in __assign_resources_sorted() Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 13/25] PCI: Refactor pdev_sort_resources() & __dev_sort_resources() Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 14/25] PCI: Use while loop and break instead of gotos Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 15/25] PCI: Rename retval to ret Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 16/25] PCI: Consolidate assignment loop next round preparation Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 17/25] PCI: Remove wrong comment from pci_reassign_resource() Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 18/25] PCI: Add restore_dev_resource() Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 19/25] PCI: Extend enable to check for any optional resource Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 20/25] PCI: Always have realloc_head in __assign_resources_sorted() Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 21/25] PCI: Indicate optional resource assignment failures Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 22/25] PCI: Add debug print when releasing resources before retry Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 23/25] PCI: Use res->parent to check is resource is assigned Ilpo Järvinen
2024-12-16 17:56 ` [PATCH 24/25] PCI: Perform reset_resource() and build fail list in sync Ilpo Järvinen
2025-04-01 2:35 ` Guenter Roeck
2025-04-01 10:18 ` Ilpo Järvinen
2025-04-01 12:07 ` Ilpo Järvinen
2025-04-01 14:15 ` Guenter Roeck
2025-04-01 17:38 ` Ilpo Järvinen
2025-04-11 19:37 ` Ondřej Jirman
2025-04-14 9:52 ` Ilpo Järvinen
2025-04-14 12:19 ` Ondřej Jirman
2025-04-14 13:15 ` Ilpo Järvinen
2025-04-14 13:43 ` Ondřej Jirman
2025-04-14 13:52 ` Ilpo Järvinen
2025-04-01 13:28 ` Guenter Roeck
2024-12-16 17:56 ` [PATCH 25/25] PCI: Rework optional resource handling Ilpo Järvinen
2025-02-13 21:46 ` [PATCH 00/25] PCI: Resource fitting/assignment fixes and cleanups Bjorn Helgaas
2025-02-14 8:18 ` Xiaochun XC17 Li | 李小春 Xavier
2025-02-14 11:53 ` Ilpo Järvinen
2025-02-14 21:28 ` Bjorn Helgaas
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