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Sat, 11 Apr 2026 08:03:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775894591; bh=6TdFxnj/XF9dGvehexRWCwNHzJWM7dA99CTM42Uhd0k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cMP/y7W1Fkw+9eXey4NyQYjxyZUxA+Yrl9JuSmZzLWwI0/YEs+9gbjnmbTLa8uiOj VIVR3BMkLl8BGjI5OlPWzFOXDNvXwk3nm0O1g+N7SDm8EVpFl/30kSTYtB9W4zMn8j mWG/Ia/YDTHfKqZXfMqkxSma1lyTIYLLHvPmhDkyv7uCNuh6OZddiPeRVJj0UyhjXt t8NR3IYUfEtqFmn1OztDwngHcOleIWaUrUOkPvkzfgghm4fm2yrYAth1yZ5F0hKV3E xr84uvy8fYf3tO4P6s2Zce7kYvvWfSwUplBXyKwsAmc3fUwnjbrp0kMO9RKQy8jw21 HDrtdQHNb6MQA== From: =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= To: Bjorn Helgaas Cc: Bjorn Helgaas , Manivannan Sadhasivam , Lorenzo Pieralisi , Magnus Lindholm , Matt Turner , Richard Henderson , Christophe Leroy , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Dexuan Cui , =?UTF-8?q?Krzysztof=20Ha=C5=82asa?= , Lukas Wunner , "Oliver O'Halloran" , Saurabh Singh Sengar , Shuan He , Srivatsa Bhat , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , linux-pci@vger.kernel.org, linux-alpha@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH v4 22/24] PCI/sysfs: Add __weak pci_legacy_has_sparse() helper Date: Sat, 11 Apr 2026 08:01:46 +0000 Message-ID: <20260411080148.471335-23-kwilczynski@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260411080148.471335-1-kwilczynski@kernel.org> References: <20260411080148.471335-1-kwilczynski@kernel.org> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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. Signed-off-by: Krzysztof Wilczyński --- 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 a9dea147528d..ea51f6b20458 100644 --- a/arch/alpha/kernel/pci-sysfs.c +++ b/arch/alpha/kernel/pci-sysfs.c @@ -191,6 +191,13 @@ 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 3a7bbb00ca60..ce004b349594 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -1019,6 +1019,12 @@ 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 1bf165595583..f52caf7e4d13 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -390,6 +390,10 @@ 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[]; -- 2.53.0