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Message-Id: <20241015-ep-msi-v3-2-cedc89a16c1a@nxp.com>
Date: Tue, 15 Oct 2024 18:07:15 -0400
From: Frank Li <Frank.Li@....com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
Krzysztof WilczyĆski <kw@...ux.com>,
Kishon Vijay Abraham I <kishon@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
imx@...ts.linux.dev, Niklas Cassel <cassel@...nel.org>, dlemoal@...nel.org,
maz@...nel.org, tglx@...utronix.de, jdmason@...zu.us,
Frank Li <Frank.Li@....com>
Subject: [PATCH v3 2/6] PCI: endpoint: Add pci_epc_get_fn() API for
customizable filtering
Introduce the pci_epc_get_fn() API, allowing a custom filter callback
function to be passed. Reimplement pci_epc_get() using pci_epc_get_fn()
with a match name callback. Prepare the codebase for adding RC-to-EP
doorbell support.
Add DEFINE_FREE(pci_epc_put) to implement scope based auto cleanup.
Signed-off-by: Frank Li <Frank.Li@....com>
---
drivers/pci/endpoint/pci-epc-core.c | 23 +++++++++++++++++++++--
include/linux/pci-epc.h | 2 ++
2 files changed, 23 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 17f0071092550..14e6011df4b2c 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -48,6 +48,11 @@ void pci_epc_put(struct pci_epc *epc)
}
EXPORT_SYMBOL_GPL(pci_epc_put);
+static bool pci_epc_match_name(struct device *dev, void *name)
+{
+ return strcmp(dev_name(dev), name) == 0;
+}
+
/**
* pci_epc_get() - get the PCI endpoint controller
* @epc_name: device name of the endpoint controller
@@ -56,6 +61,20 @@ EXPORT_SYMBOL_GPL(pci_epc_put);
* endpoint controller
*/
struct pci_epc *pci_epc_get(const char *epc_name)
+{
+ return pci_epc_get_fn(pci_epc_match_name, (void *)epc_name);
+}
+EXPORT_SYMBOL_GPL(pci_epc_get);
+
+/**
+ * pci_epc_get_fn() - get the PCI endpoint controller
+ * @fn: callback match filter function, return true when matched
+ * @param: parameter for callback function fn
+ *
+ * Invoke to get struct pci_epc * corresponding to the device name of the
+ * endpoint controller
+ */
+struct pci_epc *pci_epc_get_fn(bool (*fn)(struct device *dev, void *param), void *param)
{
int ret = -EINVAL;
struct pci_epc *epc;
@@ -64,7 +83,7 @@ struct pci_epc *pci_epc_get(const char *epc_name)
class_dev_iter_init(&iter, &pci_epc_class, NULL, NULL);
while ((dev = class_dev_iter_next(&iter))) {
- if (strcmp(epc_name, dev_name(dev)))
+ if (!fn(dev, param))
continue;
epc = to_pci_epc(dev);
@@ -82,7 +101,7 @@ struct pci_epc *pci_epc_get(const char *epc_name)
class_dev_iter_exit(&iter);
return ERR_PTR(ret);
}
-EXPORT_SYMBOL_GPL(pci_epc_get);
+EXPORT_SYMBOL_GPL(pci_epc_get_fn);
/**
* pci_epc_get_first_free_bar() - helper to get first unreserved BAR
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 42ef06136bd1a..682808f4510be 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -266,7 +266,9 @@ pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features);
enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features
*epc_features, enum pci_barno bar);
struct pci_epc *pci_epc_get(const char *epc_name);
+struct pci_epc *pci_epc_get_fn(bool (*fn)(struct device *dev, void *param), void *param);
void pci_epc_put(struct pci_epc *epc);
+DEFINE_FREE(pci_epc_put, void *, if (!(_T)) pci_epc_put(_T))
int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t base,
size_t size, size_t page_size);
--
2.34.1
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