[PATCH v8 21/25] PCI/sysfs: Add __weak pci_legacy_has_sparse() helper
From: Krzysztof Wilczyński <kwilczynski@kernel.org>
Date: 2026-06-19 08:53:21
Also in:
linux-alpha, linux-pci
Subsystem:
alpha port, pci subsystem, the rest · Maintainers:
Richard Henderson, Matt Turner, Magnus Lindholm, Bjorn Helgaas, Linus Torvalds
Currently, Alpha's sparse/dense legacy attribute handling is done via pci_adjust_legacy_attr(), which updates dynamically allocated attributes at runtime. The upcoming conversion to static attributes needs a way to determine sparse support at visibility check time. Add a __weak pci_legacy_has_sparse() that returns false by default. Alpha overrides it to check has_sparse() on the bus host controller. Tested-by: Shivaprasad G Bhat <redacted> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> --- arch/alpha/include/asm/pci.h | 2 ++ arch/alpha/kernel/pci-sysfs.c | 7 +++++++ drivers/pci/pci-sysfs.c | 6 ++++++ drivers/pci/pci.h | 4 ++++ 4 files changed, 19 insertions(+)
diff --git a/arch/alpha/include/asm/pci.h b/arch/alpha/include/asm/pci.h
index ef19295f2e33..95de7ffd59e8 100644
--- a/arch/alpha/include/asm/pci.h
+++ b/arch/alpha/include/asm/pci.h@@ -86,6 +86,8 @@ extern int pci_mmap_legacy_page_range(struct pci_bus *bus, enum pci_mmap_state mmap_state); extern void pci_adjust_legacy_attr(struct pci_bus *bus, enum pci_mmap_state mmap_type); +extern bool pci_legacy_has_sparse(struct pci_bus *bus, + enum pci_mmap_state type); #define HAVE_PCI_LEGACY 1 extern const struct attribute_group pci_dev_resource_attr_group;
diff --git a/arch/alpha/kernel/pci-sysfs.c b/arch/alpha/kernel/pci-sysfs.c
index 74c9145e0253..2d878b310629 100644
--- a/arch/alpha/kernel/pci-sysfs.c
+++ b/arch/alpha/kernel/pci-sysfs.c@@ -184,6 +184,13 @@ int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma, return hose_mmap_page_range(hose, vma, mmap_type, sparse); } +bool pci_legacy_has_sparse(struct pci_bus *bus, enum pci_mmap_state type) +{ + struct pci_controller *hose = bus->sysdata; + + return has_sparse(hose, type); +} + /** * pci_adjust_legacy_attr - adjustment of legacy file attributes * @bus: bus to create files under
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index b8986a735a46..a861484ac0c0 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c@@ -983,6 +983,12 @@ static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj, return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io); } +bool __weak pci_legacy_has_sparse(struct pci_bus *bus, + enum pci_mmap_state type) +{ + return false; +} + /** * pci_adjust_legacy_attr - adjustment of legacy file attributes * @b: bus to create files under
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 71a1fde1e505..c64c7f5f0bcf 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h@@ -392,6 +392,10 @@ static inline int pci_no_d1d2(struct pci_dev *dev) } +#ifdef HAVE_PCI_LEGACY +bool pci_legacy_has_sparse(struct pci_bus *bus, enum pci_mmap_state type); +#endif + #ifdef CONFIG_SYSFS extern const struct attribute_group *pci_dev_groups[]; extern const struct attribute_group *pci_dev_attr_groups[];
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2.54.0