From: Tianfei Zhang <tianfei.zhang@intel.com>
To: bhelgaas@google.com, linux-pci@vger.kernel.org,
linux-fpga@vger.kernel.org, lukas@wunner.de, kabel@kernel.org,
mani@kernel.org, pali@kernel.org, mdf@kernel.org,
hao.wu@intel.com, yilun.xu@intel.com, trix@redhat.com,
jgg@ziepe.ca, ira.weiny@intel.com,
andriy.shevchenko@linux.intel.com, dan.j.williams@intel.com,
keescook@chromium.org, rafael@kernel.org,
russell.h.weight@intel.com, corbet@lwn.net,
linux-doc@vger.kernel.org, ilpo.jarvinen@linux.intel.com,
lee@kernel.org, gregkh@linuxfoundation.org,
matthew.gerlach@linux.intel.com
Cc: Tianfei Zhang <tianfei.zhang@intel.com>
Subject: [PATCH v1 03/12] PCI: hotplug: add and expose link disable API
Date: Wed, 18 Jan 2023 20:35:53 -0500 [thread overview]
Message-ID: <20230119013602.607466-4-tianfei.zhang@intel.com> (raw)
In-Reply-To: <20230119013602.607466-1-tianfei.zhang@intel.com>
When a PCIe-based FPGA card is reprogrammed, it temporarily
disappears from the PCIe bus. This needs to be managed to
avoid PCIe errors while the device is not present. Also,
re-probing and rescan the PCI devices must be performed after
loading the new images. Export functions from pciehp driver
necessary for disable and enable the PCI link of a PCI hotplug
bridge.
Signed-off-by: Tianfei Zhang <tianfei.zhang@intel.com>
---
drivers/pci/hotplug/pciehp.h | 1 +
drivers/pci/hotplug/pciehp_hpc.c | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index c7f455a3b08f..8b58d0e84644 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -195,6 +195,7 @@ int pciehp_get_raw_indicator_status(struct hotplug_slot *h_slot, u8 *status);
int pciehp_slot_reset(struct pcie_device *dev);
int pciehp_link_enable(struct controller *ctrl);
+int pciehp_link_disable(struct controller *ctrl);
static inline const char *slot_name(struct controller *ctrl)
{
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 11e4bc58aec0..729546c0c1f9 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -353,6 +353,12 @@ int pciehp_link_enable(struct controller *ctrl)
}
EXPORT_SYMBOL_NS_GPL(pciehp_link_enable, PCIEHP);
+int pciehp_link_disable(struct controller *ctrl)
+{
+ return __pciehp_link_set(ctrl, false);
+}
+EXPORT_SYMBOL_NS_GPL(pciehp_link_disable, PCIEHP);
+
int pciehp_get_raw_indicator_status(struct hotplug_slot *hotplug_slot,
u8 *status)
{
--
2.38.1
next prev parent reply other threads:[~2023-01-19 1:33 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-19 1:35 [PATCH v1 00/12] add FPGA hotplug manager driver Tianfei Zhang
2023-01-19 1:35 ` [PATCH v1 01/12] PCI: hotplug: add new callbacks on hotplug_slot_ops Tianfei Zhang
2023-01-19 13:31 ` Greg KH
2023-01-19 1:35 ` [PATCH v1 02/12] PCI: hotplug: expose APIs from pciehp driver Tianfei Zhang
2023-01-19 1:35 ` Tianfei Zhang [this message]
2023-01-19 1:35 ` [PATCH v1 04/12] PCI: hotplug: add FPGA PCI hotplug manager driver Tianfei Zhang
2023-01-19 1:35 ` [PATCH v1 05/12] fpga: dfl: register dfl-pci device into fpgahph driver Tianfei Zhang
2023-01-19 1:35 ` [PATCH v1 06/12] driver core: expose device_is_ancestor() API Tianfei Zhang
2023-01-19 1:35 ` [PATCH v1 07/12] PCI: hotplug: add register/unregister function for BMC device Tianfei Zhang
2023-01-19 1:35 ` [PATCH v1 08/12] fpga: m10bmc-sec: register BMC device into fpgahp driver Tianfei Zhang
2023-01-19 1:35 ` [PATCH v1 09/12] fpga: dfl: remove non-reserved devices Tianfei Zhang
2023-01-19 1:36 ` [PATCH v1 10/12] PCI: hotplug: implement the hotplug_slot_ops callback for fpgahp Tianfei Zhang
2023-01-19 13:28 ` Greg KH
2023-01-20 22:38 ` Russ Weight
2023-01-21 7:35 ` Greg KH
2023-01-19 1:36 ` [PATCH v1 11/12] fpga: m10bmc-sec: add m10bmc_sec_retimer_load callback Tianfei Zhang
2023-01-19 14:22 ` Lee Jones
2023-01-19 1:36 ` [PATCH v1 12/12] Documentation: fpga: add description of fpgahp driver Tianfei Zhang
2023-01-19 9:38 ` Bagas Sanjaya
2023-01-19 8:06 ` [PATCH v1 00/12] add FPGA hotplug manager driver Pali Rohár
2023-01-19 8:17 ` Zhang, Tianfei
2023-01-19 11:27 ` andriy.shevchenko
2023-01-19 12:09 ` Zhang, Tianfei
2023-01-19 13:33 ` Greg KH
2023-01-19 13:43 ` Rafael J. Wysocki
2023-01-19 15:33 ` Greg KH
2023-01-20 16:28 ` Russ Weight
2023-01-20 18:42 ` Lukas Wunner
2023-01-21 7:34 ` Greg KH
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