Hello,
This is the follow up series of [1], to improve the handling of host reboot in
the endpoint subsystem. This involves refining the PERST# and Link Down event
handling in both the controller and function drivers.
Testing
=======
This series is tested on Qcom SM8450 based development board with both MHI_EPF
and EPF_TEST function drivers. And also by Niklas on Rockchip platform.
Dependency
==========
This series depends on [1] and [2] which are currently in pci/next.
- Mani
[1] https://lore.kernel.org/linux-pci/[email protected]/
[2] https://lore.kernel.org/linux-pci/[email protected]/
Signed-off-by: Manivannan Sadhasivam <[email protected]>
---
Changes in v4:
- Reworded the pci_epc_bme_notify() Kdoc (Bjorn)
- Added a patch to drop 'Link is enabled' for BME event (Bjorn)
- Collected tags from Niklas
- Rebased on top of pci/next
Changes in v3:
- Dropped the patch that split epc_events into two
- Added a patch to rename BME to Bus Master Enable
- Added back the comment for REBAR
- Switched to cancel_delayed_work_sync() for Link Down event
- Rebased on top of pci/next
- Dropped the tested-by tag from Niklas as I'd like to get this series tested
one more time due to changes
- Link to v2: https://lore.kernel.org/r/[email protected]
Changes in v2:
- Dropped the {start/stop}_link rework patches
- Incorporated comments from Niklas
- Collected review tags
- Rebased on top of v6.9-rc1 and https://lore.kernel.org/linux-pci/[email protected]/
- Link to v1: https://lore.kernel.org/r/[email protected]
---
Manivannan Sadhasivam (10):
PCI: qcom-ep: Disable resources unconditionally during PERST# assert
PCI: endpoint: Rename core_init() callback in 'struct pci_epc_event_ops' to epc_init()
PCI: endpoint: Rename BME to Bus Master Enable
PCI: qcom-ep: Drop 'Link is enabled' from the debug message for BME event
PCI: endpoint: pci-epf-test: Refactor pci_epf_test_unbind() function
PCI: endpoint: pci-epf-{mhi/test}: Move DMA initialization to EPC init callback
PCI: endpoint: Introduce 'epc_deinit' event and notify the EPF drivers
PCI: dwc: ep: Add a generic dw_pcie_ep_linkdown() API to handle Link Down event
PCI: qcom-ep: Use the generic dw_pcie_ep_linkdown() API to handle Link Down event
PCI: endpoint: pci-epf-test: Handle Link Down event
drivers/pci/controller/dwc/pcie-designware-ep.c | 104 ++++++++++++++++--------
drivers/pci/controller/dwc/pcie-designware.h | 5 ++
drivers/pci/controller/dwc/pcie-qcom-ep.c | 13 +--
drivers/pci/controller/dwc/pcie-tegra194.c | 1 +
drivers/pci/endpoint/functions/pci-epf-mhi.c | 47 +++++++----
drivers/pci/endpoint/functions/pci-epf-test.c | 95 ++++++++++++++++------
drivers/pci/endpoint/pci-epc-core.c | 60 ++++++++++----
include/linux/pci-epc.h | 3 +-
include/linux/pci-epf.h | 10 ++-
9 files changed, 231 insertions(+), 107 deletions(-)
---
base-commit: b4d6d92902f50a577021f2cc08ac680b10658aca
change-id: 20240314-pci-epf-rework-a6e65b103a79
Best regards,
--
Manivannan Sadhasivam <[email protected]>
core_init() callback is used to notify the EPC initialization event to the
EPF drivers. The 'core' prefix was used indicate that the controller IP
core has completed initialization. But it serves no purpose as the EPF
driver will only care about the EPC initialization as a whole and there is
no real benefit to distinguish the IP core part.
So let's rename the core_init() callback in 'struct pci_epc_event_ops' to
epc_init() to make it more clear.
Reviewed-by: Niklas Cassel <[email protected]>
Tested-by: Niklas Cassel <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
---
drivers/pci/endpoint/functions/pci-epf-mhi.c | 4 ++--
drivers/pci/endpoint/functions/pci-epf-test.c | 4 ++--
drivers/pci/endpoint/pci-epc-core.c | 16 ++++++++--------
include/linux/pci-epf.h | 4 ++--
4 files changed, 14 insertions(+), 14 deletions(-)
diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c
index 2c54d80107cf..95c3206f609f 100644
--- a/drivers/pci/endpoint/functions/pci-epf-mhi.c
+++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c
@@ -716,7 +716,7 @@ static void pci_epf_mhi_dma_deinit(struct pci_epf_mhi *epf_mhi)
epf_mhi->dma_chan_rx = NULL;
}
-static int pci_epf_mhi_core_init(struct pci_epf *epf)
+static int pci_epf_mhi_epc_init(struct pci_epf *epf)
{
struct pci_epf_mhi *epf_mhi = epf_get_drvdata(epf);
const struct pci_epf_mhi_ep_info *info = epf_mhi->info;
@@ -897,7 +897,7 @@ static void pci_epf_mhi_unbind(struct pci_epf *epf)
}
static const struct pci_epc_event_ops pci_epf_mhi_event_ops = {
- .core_init = pci_epf_mhi_core_init,
+ .epc_init = pci_epf_mhi_epc_init,
.link_up = pci_epf_mhi_link_up,
.link_down = pci_epf_mhi_link_down,
.bme = pci_epf_mhi_bme,
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 977fb79c1567..8175d4f2a0eb 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -731,7 +731,7 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
return 0;
}
-static int pci_epf_test_core_init(struct pci_epf *epf)
+static int pci_epf_test_epc_init(struct pci_epf *epf)
{
struct pci_epf_test *epf_test = epf_get_drvdata(epf);
struct pci_epf_header *header = epf->header;
@@ -799,7 +799,7 @@ static int pci_epf_test_link_up(struct pci_epf *epf)
}
static const struct pci_epc_event_ops pci_epf_test_event_ops = {
- .core_init = pci_epf_test_core_init,
+ .epc_init = pci_epf_test_epc_init,
.link_up = pci_epf_test_link_up,
};
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 47d27ec7439d..e6bffa37a948 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -727,9 +727,9 @@ void pci_epc_linkdown(struct pci_epc *epc)
EXPORT_SYMBOL_GPL(pci_epc_linkdown);
/**
- * pci_epc_init_notify() - Notify the EPF device that EPC device's core
- * initialization is completed.
- * @epc: the EPC device whose core initialization is completed
+ * pci_epc_init_notify() - Notify the EPF device that EPC device initialization
+ * is completed.
+ * @epc: the EPC device whose initialization is completed
*
* Invoke to Notify the EPF device that the EPC device's initialization
* is completed.
@@ -744,8 +744,8 @@ void pci_epc_init_notify(struct pci_epc *epc)
mutex_lock(&epc->list_lock);
list_for_each_entry(epf, &epc->pci_epf, list) {
mutex_lock(&epf->lock);
- if (epf->event_ops && epf->event_ops->core_init)
- epf->event_ops->core_init(epf);
+ if (epf->event_ops && epf->event_ops->epc_init)
+ epf->event_ops->epc_init(epf);
mutex_unlock(&epf->lock);
}
epc->init_complete = true;
@@ -756,7 +756,7 @@ EXPORT_SYMBOL_GPL(pci_epc_init_notify);
/**
* pci_epc_notify_pending_init() - Notify the pending EPC device initialization
* complete to the EPF device
- * @epc: the EPC device whose core initialization is pending to be notified
+ * @epc: the EPC device whose initialization is pending to be notified
* @epf: the EPF device to be notified
*
* Invoke to notify the pending EPC device initialization complete to the EPF
@@ -767,8 +767,8 @@ void pci_epc_notify_pending_init(struct pci_epc *epc, struct pci_epf *epf)
{
if (epc->init_complete) {
mutex_lock(&epf->lock);
- if (epf->event_ops && epf->event_ops->core_init)
- epf->event_ops->core_init(epf);
+ if (epf->event_ops && epf->event_ops->epc_init)
+ epf->event_ops->epc_init(epf);
mutex_unlock(&epf->lock);
}
}
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index adee6a1b35db..afe3bfd88742 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -70,13 +70,13 @@ struct pci_epf_ops {
/**
* struct pci_epc_event_ops - Callbacks for capturing the EPC events
- * @core_init: Callback for the EPC initialization complete event
+ * @epc_init: Callback for the EPC initialization complete event
* @link_up: Callback for the EPC link up event
* @link_down: Callback for the EPC link down event
* @bme: Callback for the EPC BME (Bus Master Enable) event
*/
struct pci_epc_event_ops {
- int (*core_init)(struct pci_epf *epf);
+ int (*epc_init)(struct pci_epf *epf);
int (*link_up)(struct pci_epf *epf);
int (*link_down)(struct pci_epf *epf);
int (*bme)(struct pci_epf *epf);
--
2.25.1
BME which stands for 'Bus Master Enable' is not defined in the PCIe base
spec even though it is commonly referred in many places (vendor docs). But
to align with the spec, let's rename it to its expansion 'Bus Master
Enable'.
Suggested-by: Damien Le Moal <[email protected]>
Reviewed-by: Niklas Cassel <[email protected]>
Tested-by: Niklas Cassel <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
---
drivers/pci/controller/dwc/pcie-qcom-ep.c | 4 ++--
drivers/pci/endpoint/functions/pci-epf-mhi.c | 8 ++++----
drivers/pci/endpoint/pci-epc-core.c | 19 ++++++++++---------
include/linux/pci-epc.h | 2 +-
include/linux/pci-epf.h | 4 ++--
5 files changed, 19 insertions(+), 18 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index 50b1635e3cbb..f6e925d434f6 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -636,10 +636,10 @@ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data)
pcie_ep->link_status = QCOM_PCIE_EP_LINK_DOWN;
pci_epc_linkdown(pci->ep.epc);
} else if (FIELD_GET(PARF_INT_ALL_BME, status)) {
- dev_dbg(dev, "Received BME event. Link is enabled!\n");
+ dev_dbg(dev, "Received Bus Master Enable event. Link is enabled!\n");
pcie_ep->link_status = QCOM_PCIE_EP_LINK_ENABLED;
qcom_pcie_ep_icc_update(pcie_ep);
- pci_epc_bme_notify(pci->ep.epc);
+ pci_epc_bus_master_enable_notify(pci->ep.epc);
} else if (FIELD_GET(PARF_INT_ALL_PM_TURNOFF, status)) {
dev_dbg(dev, "Received PM Turn-off event! Entering L23\n");
val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL);
diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c
index 95c3206f609f..b662905e2532 100644
--- a/drivers/pci/endpoint/functions/pci-epf-mhi.c
+++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c
@@ -819,7 +819,7 @@ static int pci_epf_mhi_link_down(struct pci_epf *epf)
return 0;
}
-static int pci_epf_mhi_bme(struct pci_epf *epf)
+static int pci_epf_mhi_bus_master_enable(struct pci_epf *epf)
{
struct pci_epf_mhi *epf_mhi = epf_get_drvdata(epf);
const struct pci_epf_mhi_ep_info *info = epf_mhi->info;
@@ -882,8 +882,8 @@ static void pci_epf_mhi_unbind(struct pci_epf *epf)
/*
* Forcefully power down the MHI EP stack. Only way to bring the MHI EP
- * stack back to working state after successive bind is by getting BME
- * from host.
+ * stack back to working state after successive bind is by getting Bus
+ * Master Enable event from host.
*/
if (mhi_cntrl->mhi_dev) {
mhi_ep_power_down(mhi_cntrl);
@@ -900,7 +900,7 @@ static const struct pci_epc_event_ops pci_epf_mhi_event_ops = {
.epc_init = pci_epf_mhi_epc_init,
.link_up = pci_epf_mhi_link_up,
.link_down = pci_epf_mhi_link_down,
- .bme = pci_epf_mhi_bme,
+ .bus_master_enable = pci_epf_mhi_bus_master_enable,
};
static int pci_epf_mhi_probe(struct pci_epf *epf,
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index e6bffa37a948..56b60330355d 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -775,14 +775,15 @@ void pci_epc_notify_pending_init(struct pci_epc *epc, struct pci_epf *epf)
EXPORT_SYMBOL_GPL(pci_epc_notify_pending_init);
/**
- * pci_epc_bme_notify() - Notify the EPF device that the EPC device has received
- * the BME event from the Root complex
- * @epc: the EPC device that received the BME event
+ * pci_epc_bus_master_enable_notify() - Notify the EPF device that the EPC
+ * device has received the Bus Master
+ * Enable event from the Root complex
+ * @epc: the EPC device that received the Bus Master Enable event
*
- * Invoke to Notify the EPF device that the EPC device has received the Bus
- * Master Enable (BME) event from the Root complex
+ * Notify the EPF device that the EPC device has generated the Bus Master Enable
+ * event due to host setting the Bus Master Enable bit in the Command register.
*/
-void pci_epc_bme_notify(struct pci_epc *epc)
+void pci_epc_bus_master_enable_notify(struct pci_epc *epc)
{
struct pci_epf *epf;
@@ -792,13 +793,13 @@ void pci_epc_bme_notify(struct pci_epc *epc)
mutex_lock(&epc->list_lock);
list_for_each_entry(epf, &epc->pci_epf, list) {
mutex_lock(&epf->lock);
- if (epf->event_ops && epf->event_ops->bme)
- epf->event_ops->bme(epf);
+ if (epf->event_ops && epf->event_ops->bus_master_enable)
+ epf->event_ops->bus_master_enable(epf);
mutex_unlock(&epf->lock);
}
mutex_unlock(&epc->list_lock);
}
-EXPORT_SYMBOL_GPL(pci_epc_bme_notify);
+EXPORT_SYMBOL_GPL(pci_epc_bus_master_enable_notify);
/**
* pci_epc_destroy() - destroy the EPC device
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index acc5f96161fe..11115cd0fe5b 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -226,7 +226,7 @@ void pci_epc_linkup(struct pci_epc *epc);
void pci_epc_linkdown(struct pci_epc *epc);
void pci_epc_init_notify(struct pci_epc *epc);
void pci_epc_notify_pending_init(struct pci_epc *epc, struct pci_epf *epf);
-void pci_epc_bme_notify(struct pci_epc *epc);
+void pci_epc_bus_master_enable_notify(struct pci_epc *epc);
void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf,
enum pci_epc_interface_type type);
int pci_epc_write_header(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index afe3bfd88742..dc759eb7157c 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -73,13 +73,13 @@ struct pci_epf_ops {
* @epc_init: Callback for the EPC initialization complete event
* @link_up: Callback for the EPC link up event
* @link_down: Callback for the EPC link down event
- * @bme: Callback for the EPC BME (Bus Master Enable) event
+ * @bus_master_enable: Callback for the EPC Bus Master Enable event
*/
struct pci_epc_event_ops {
int (*epc_init)(struct pci_epf *epf);
int (*link_up)(struct pci_epf *epf);
int (*link_down)(struct pci_epf *epf);
- int (*bme)(struct pci_epf *epf);
+ int (*bus_master_enable)(struct pci_epf *epf);
};
/**
--
2.25.1
To maintain uniformity across EPF drivers, let's move the DMA
initialization to EPC init callback. This will also allow us to deinit DMA
during PERST# assert in the further commits.
For EPC drivers without PERST#, DMA deinit will only happen during driver
unbind.
Reviewed-by: Niklas Cassel <[email protected]>
Tested-by: Niklas Cassel <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
---
drivers/pci/endpoint/functions/pci-epf-mhi.c | 16 ++++++++--------
drivers/pci/endpoint/functions/pci-epf-test.c | 12 ++++++------
2 files changed, 14 insertions(+), 14 deletions(-)
diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c
index b662905e2532..205c02953f25 100644
--- a/drivers/pci/endpoint/functions/pci-epf-mhi.c
+++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c
@@ -753,6 +753,14 @@ static int pci_epf_mhi_epc_init(struct pci_epf *epf)
if (!epf_mhi->epc_features)
return -ENODATA;
+ if (info->flags & MHI_EPF_USE_DMA) {
+ ret = pci_epf_mhi_dma_init(epf_mhi);
+ if (ret) {
+ dev_err(dev, "Failed to initialize DMA: %d\n", ret);
+ return ret;
+ }
+ }
+
return 0;
}
@@ -765,14 +773,6 @@ static int pci_epf_mhi_link_up(struct pci_epf *epf)
struct device *dev = &epf->dev;
int ret;
- if (info->flags & MHI_EPF_USE_DMA) {
- ret = pci_epf_mhi_dma_init(epf_mhi);
- if (ret) {
- dev_err(dev, "Failed to initialize DMA: %d\n", ret);
- return ret;
- }
- }
-
mhi_cntrl->mmio = epf_mhi->mmio;
mhi_cntrl->irq = epf_mhi->irq;
mhi_cntrl->mru = info->mru;
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 2430384f9a89..ab714108dfdb 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -739,6 +739,12 @@ static int pci_epf_test_epc_init(struct pci_epf *epf)
bool msi_capable = true;
int ret;
+ epf_test->dma_supported = true;
+
+ ret = pci_epf_test_init_dma_chan(epf_test);
+ if (ret)
+ epf_test->dma_supported = false;
+
epc_features = pci_epc_get_features(epc, epf->func_no, epf->vfunc_no);
if (epc_features) {
msix_capable = epc_features->msix_capable;
@@ -895,12 +901,6 @@ static int pci_epf_test_bind(struct pci_epf *epf)
if (ret)
return ret;
- epf_test->dma_supported = true;
-
- ret = pci_epf_test_init_dma_chan(epf_test);
- if (ret)
- epf_test->dma_supported = false;
-
return 0;
}
--
2.25.1
As like the 'epc_init' event, that is used to signal the EPF drivers about
the EPC initialization, let's introduce 'epc_deinit' event that is used to
signal EPC deinitialization.
The EPC deinitialization applies only when any sort of fundamental reset
is supported by the endpoint controller as per the PCIe spec.
Reference: PCIe Base spec v5.0, sections 4.2.4.9.1 and 6.6.1.
Currently, some EPC drivers like pcie-qcom-ep and pcie-tegra194 support
PERST# as the fundamental reset. So the 'deinit' event will be notified to
the EPF drivers when PERST# assert happens in the above mentioned EPC
drivers.
The EPF drivers, on receiving the event through the epc_deinit() callback
should reset the EPF state machine and also cleanup any configuration that
got affected by the fundamental reset like BAR, DMA etc...
This change also warrants skipping the cleanups in unbind() if already done
in epc_deinit().
Reviewed-by: Niklas Cassel <[email protected]>
Tested-by: Niklas Cassel <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
---
drivers/pci/controller/dwc/pcie-designware-ep.c | 1 -
drivers/pci/controller/dwc/pcie-qcom-ep.c | 1 +
drivers/pci/controller/dwc/pcie-tegra194.c | 1 +
drivers/pci/endpoint/functions/pci-epf-mhi.c | 19 +++++++++++++++++++
drivers/pci/endpoint/functions/pci-epf-test.c | 17 +++++++++++++++--
drivers/pci/endpoint/pci-epc-core.c | 25 +++++++++++++++++++++++++
include/linux/pci-epc.h | 1 +
include/linux/pci-epf.h | 2 ++
8 files changed, 64 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 47391d7d3a73..2063cf2049e5 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -632,7 +632,6 @@ void dw_pcie_ep_cleanup(struct dw_pcie_ep *ep)
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
dw_pcie_edma_remove(pci);
- ep->epc->init_complete = false;
}
EXPORT_SYMBOL_GPL(dw_pcie_ep_cleanup);
diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index dcac177b55fb..3ee715df36ea 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -501,6 +501,7 @@ static void qcom_pcie_perst_assert(struct dw_pcie *pci)
{
struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
+ pci_epc_deinit_notify(pci->ep.epc);
dw_pcie_ep_cleanup(&pci->ep);
qcom_pcie_disable_resources(pcie_ep);
pcie_ep->link_status = QCOM_PCIE_EP_LINK_DISABLED;
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 93f5433c5c55..4b28f8beedfe 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -1715,6 +1715,7 @@ static void pex_ep_event_pex_rst_assert(struct tegra_pcie_dw *pcie)
if (ret)
dev_err(pcie->dev, "Failed to go Detect state: %d\n", ret);
+ pci_epc_deinit_notify(pcie->pci.ep.epc);
dw_pcie_ep_cleanup(&pcie->pci.ep);
reset_control_assert(pcie->core_rst);
diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c
index 205c02953f25..5832989e55e8 100644
--- a/drivers/pci/endpoint/functions/pci-epf-mhi.c
+++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c
@@ -764,6 +764,24 @@ static int pci_epf_mhi_epc_init(struct pci_epf *epf)
return 0;
}
+static void pci_epf_mhi_epc_deinit(struct pci_epf *epf)
+{
+ struct pci_epf_mhi *epf_mhi = epf_get_drvdata(epf);
+ const struct pci_epf_mhi_ep_info *info = epf_mhi->info;
+ struct pci_epf_bar *epf_bar = &epf->bar[info->bar_num];
+ struct mhi_ep_cntrl *mhi_cntrl = &epf_mhi->mhi_cntrl;
+ struct pci_epc *epc = epf->epc;
+
+ if (mhi_cntrl->mhi_dev) {
+ mhi_ep_power_down(mhi_cntrl);
+ if (info->flags & MHI_EPF_USE_DMA)
+ pci_epf_mhi_dma_deinit(epf_mhi);
+ mhi_ep_unregister_controller(mhi_cntrl);
+ }
+
+ pci_epc_clear_bar(epc, epf->func_no, epf->vfunc_no, epf_bar);
+}
+
static int pci_epf_mhi_link_up(struct pci_epf *epf)
{
struct pci_epf_mhi *epf_mhi = epf_get_drvdata(epf);
@@ -898,6 +916,7 @@ static void pci_epf_mhi_unbind(struct pci_epf *epf)
static const struct pci_epc_event_ops pci_epf_mhi_event_ops = {
.epc_init = pci_epf_mhi_epc_init,
+ .epc_deinit = pci_epf_mhi_epc_deinit,
.link_up = pci_epf_mhi_link_up,
.link_down = pci_epf_mhi_link_down,
.bus_master_enable = pci_epf_mhi_bus_master_enable,
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index ab714108dfdb..c8d0c51ae329 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -790,6 +790,15 @@ static int pci_epf_test_epc_init(struct pci_epf *epf)
return 0;
}
+static void pci_epf_test_epc_deinit(struct pci_epf *epf)
+{
+ struct pci_epf_test *epf_test = epf_get_drvdata(epf);
+
+ cancel_delayed_work(&epf_test->cmd_handler);
+ pci_epf_test_clean_dma_chan(epf_test);
+ pci_epf_test_clear_bar(epf);
+}
+
static int pci_epf_test_link_up(struct pci_epf *epf)
{
struct pci_epf_test *epf_test = epf_get_drvdata(epf);
@@ -802,6 +811,7 @@ static int pci_epf_test_link_up(struct pci_epf *epf)
static const struct pci_epc_event_ops pci_epf_test_event_ops = {
.epc_init = pci_epf_test_epc_init,
+ .epc_deinit = pci_epf_test_epc_deinit,
.link_up = pci_epf_test_link_up,
};
@@ -907,10 +917,13 @@ static int pci_epf_test_bind(struct pci_epf *epf)
static void pci_epf_test_unbind(struct pci_epf *epf)
{
struct pci_epf_test *epf_test = epf_get_drvdata(epf);
+ struct pci_epc *epc = epf->epc;
cancel_delayed_work(&epf_test->cmd_handler);
- pci_epf_test_clean_dma_chan(epf_test);
- pci_epf_test_clear_bar(epf);
+ if (epc->init_complete) {
+ pci_epf_test_clean_dma_chan(epf_test);
+ pci_epf_test_clear_bar(epf);
+ }
pci_epf_test_free_space(epf);
}
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 56b60330355d..47a91dcb07d7 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -774,6 +774,31 @@ void pci_epc_notify_pending_init(struct pci_epc *epc, struct pci_epf *epf)
}
EXPORT_SYMBOL_GPL(pci_epc_notify_pending_init);
+/**
+ * pci_epc_deinit_notify() - Notify the EPF device about EPC deinitialization
+ * @epc: the EPC device whose deinitialization is completed
+ *
+ * Invoke to notify the EPF device that the EPC deinitialization is completed.
+ */
+void pci_epc_deinit_notify(struct pci_epc *epc)
+{
+ struct pci_epf *epf;
+
+ if (IS_ERR_OR_NULL(epc))
+ return;
+
+ mutex_lock(&epc->list_lock);
+ list_for_each_entry(epf, &epc->pci_epf, list) {
+ mutex_lock(&epf->lock);
+ if (epf->event_ops && epf->event_ops->epc_deinit)
+ epf->event_ops->epc_deinit(epf);
+ mutex_unlock(&epf->lock);
+ }
+ epc->init_complete = false;
+ mutex_unlock(&epc->list_lock);
+}
+EXPORT_SYMBOL_GPL(pci_epc_deinit_notify);
+
/**
* pci_epc_bus_master_enable_notify() - Notify the EPF device that the EPC
* device has received the Bus Master
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 11115cd0fe5b..c39eed3ee73e 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -226,6 +226,7 @@ void pci_epc_linkup(struct pci_epc *epc);
void pci_epc_linkdown(struct pci_epc *epc);
void pci_epc_init_notify(struct pci_epc *epc);
void pci_epc_notify_pending_init(struct pci_epc *epc, struct pci_epf *epf);
+void pci_epc_deinit_notify(struct pci_epc *epc);
void pci_epc_bus_master_enable_notify(struct pci_epc *epc);
void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf,
enum pci_epc_interface_type type);
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index dc759eb7157c..0639d4dc8986 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -71,12 +71,14 @@ struct pci_epf_ops {
/**
* struct pci_epc_event_ops - Callbacks for capturing the EPC events
* @epc_init: Callback for the EPC initialization complete event
+ * @epc_deinit: Callback for the EPC deinitialization event
* @link_up: Callback for the EPC link up event
* @link_down: Callback for the EPC link down event
* @bus_master_enable: Callback for the EPC Bus Master Enable event
*/
struct pci_epc_event_ops {
int (*epc_init)(struct pci_epf *epf);
+ void (*epc_deinit)(struct pci_epf *epf);
int (*link_up)(struct pci_epf *epf);
int (*link_down)(struct pci_epf *epf);
int (*bus_master_enable)(struct pci_epf *epf);
--
2.25.1
Now that the API is available, let's make use of it. It also handles the
reinitialization of DWC non-sticky registers in addition to sending the
notification to EPF drivers.
Reviewed-by: Niklas Cassel <[email protected]>
Tested-by: Niklas Cassel <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
---
drivers/pci/controller/dwc/pcie-qcom-ep.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index 3ee715df36ea..6106b005e66b 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -635,7 +635,7 @@ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data)
if (FIELD_GET(PARF_INT_ALL_LINK_DOWN, status)) {
dev_dbg(dev, "Received Linkdown event\n");
pcie_ep->link_status = QCOM_PCIE_EP_LINK_DOWN;
- pci_epc_linkdown(pci->ep.epc);
+ dw_pcie_ep_linkdown(&pci->ep);
} else if (FIELD_GET(PARF_INT_ALL_BME, status)) {
dev_dbg(dev, "Received Bus Master Enable event\n");
pcie_ep->link_status = QCOM_PCIE_EP_LINK_ENABLED;
--
2.25.1
Move the pci_epc_clear_bar() and pci_epf_free_space() code to respective
helper functions. This allows reusing the helpers in future commits.
This also requires moving the pci_epf_test_unbind() definition below
pci_epf_test_bind() to avoid forward declaration of the above helpers.
No functional change.
Reviewed-by: Niklas Cassel <[email protected]>
Tested-by: Niklas Cassel <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
---
drivers/pci/endpoint/functions/pci-epf-test.c | 58 ++++++++++++++++++---------
1 file changed, 39 insertions(+), 19 deletions(-)
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 8175d4f2a0eb..2430384f9a89 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -686,25 +686,6 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
msecs_to_jiffies(1));
}
-static void pci_epf_test_unbind(struct pci_epf *epf)
-{
- struct pci_epf_test *epf_test = epf_get_drvdata(epf);
- struct pci_epc *epc = epf->epc;
- int bar;
-
- cancel_delayed_work(&epf_test->cmd_handler);
- pci_epf_test_clean_dma_chan(epf_test);
- for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
- if (!epf_test->reg[bar])
- continue;
-
- pci_epc_clear_bar(epc, epf->func_no, epf->vfunc_no,
- &epf->bar[bar]);
- pci_epf_free_space(epf, epf_test->reg[bar], bar,
- PRIMARY_INTERFACE);
- }
-}
-
static int pci_epf_test_set_bar(struct pci_epf *epf)
{
int bar, ret;
@@ -731,6 +712,21 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
return 0;
}
+static void pci_epf_test_clear_bar(struct pci_epf *epf)
+{
+ struct pci_epf_test *epf_test = epf_get_drvdata(epf);
+ struct pci_epc *epc = epf->epc;
+ int bar;
+
+ for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
+ if (!epf_test->reg[bar])
+ continue;
+
+ pci_epc_clear_bar(epc, epf->func_no, epf->vfunc_no,
+ &epf->bar[bar]);
+ }
+}
+
static int pci_epf_test_epc_init(struct pci_epf *epf)
{
struct pci_epf_test *epf_test = epf_get_drvdata(epf);
@@ -857,6 +853,20 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf)
return 0;
}
+static void pci_epf_test_free_space(struct pci_epf *epf)
+{
+ struct pci_epf_test *epf_test = epf_get_drvdata(epf);
+ int bar;
+
+ for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
+ if (!epf_test->reg[bar])
+ continue;
+
+ pci_epf_free_space(epf, epf_test->reg[bar], bar,
+ PRIMARY_INTERFACE);
+ }
+}
+
static int pci_epf_test_bind(struct pci_epf *epf)
{
int ret;
@@ -894,6 +904,16 @@ static int pci_epf_test_bind(struct pci_epf *epf)
return 0;
}
+static void pci_epf_test_unbind(struct pci_epf *epf)
+{
+ struct pci_epf_test *epf_test = epf_get_drvdata(epf);
+
+ cancel_delayed_work(&epf_test->cmd_handler);
+ pci_epf_test_clean_dma_chan(epf_test);
+ pci_epf_test_clear_bar(epf);
+ pci_epf_test_free_space(epf);
+}
+
static const struct pci_epf_device_id pci_epf_test_ids[] = {
{
.name = "pci_epf_test",
--
2.25.1
As per the PCIe base spec r5.0, section 5.2, Link Down event can happen
under any of the following circumstances:
1. Fundamental/Hot reset
2. Link disable transmission by upstream component
3. Moving from L2/L3 to L0
In those cases, Link Down causes some non-sticky DWC registers to loose the
state (like REBAR, etc...). So the drivers need to reinitialize them to
function properly once the link comes back again.
This is not a problem for drivers supporting PERST# IRQ, since they can
reinitialize the registers in the PERST# IRQ callback. But for the drivers
not supporting PERST#, there is no way they can reinitialize the registers
other than relying on Link Down IRQ received when the link goes down. So
let's add a DWC generic API dw_pcie_ep_linkdown() that reinitializes the
non-sticky registers and also notifies the EPF drivers about link going
down.
This API can also be used by the drivers supporting PERST# to handle the
scenario (2) mentioned above.
NOTE: For the sake of code organization, move the dw_pcie_ep_linkup()
definition just above dw_pcie_ep_linkdown().
Reviewed-by: Niklas Cassel <[email protected]>
Tested-by: Niklas Cassel <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
---
drivers/pci/controller/dwc/pcie-designware-ep.c | 103 ++++++++++++++++--------
drivers/pci/controller/dwc/pcie-designware.h | 5 ++
2 files changed, 73 insertions(+), 35 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 2063cf2049e5..b878b62460f3 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -15,18 +15,6 @@
#include <linux/pci-epc.h>
#include <linux/pci-epf.h>
-/**
- * dw_pcie_ep_linkup - Notify EPF drivers about Link Up event
- * @ep: DWC EP device
- */
-void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
-{
- struct pci_epc *epc = ep->epc;
-
- pci_epc_linkup(epc);
-}
-EXPORT_SYMBOL_GPL(dw_pcie_ep_linkup);
-
/**
* dw_pcie_ep_init_notify - Notify EPF drivers about EPC initialization complete
* @ep: DWC EP device
@@ -673,6 +661,34 @@ static unsigned int dw_pcie_ep_find_ext_capability(struct dw_pcie *pci, int cap)
return 0;
}
+static void dw_pcie_ep_init_non_sticky_registers(struct dw_pcie *pci)
+{
+ unsigned int offset;
+ unsigned int nbars;
+ u32 reg, i;
+
+ offset = dw_pcie_ep_find_ext_capability(pci, PCI_EXT_CAP_ID_REBAR);
+
+ dw_pcie_dbi_ro_wr_en(pci);
+
+ if (offset) {
+ reg = dw_pcie_readl_dbi(pci, offset + PCI_REBAR_CTRL);
+ nbars = (reg & PCI_REBAR_CTRL_NBAR_MASK) >>
+ PCI_REBAR_CTRL_NBAR_SHIFT;
+
+ /*
+ * PCIe r6.0, sec 7.8.6.2 require us to support at least one
+ * size in the range from 1 MB to 512 GB. Advertise support
+ * for 1 MB BAR size only.
+ */
+ for (i = 0; i < nbars; i++, offset += PCI_REBAR_CTRL)
+ dw_pcie_writel_dbi(pci, offset + PCI_REBAR_CAP, 0x0);
+ }
+
+ dw_pcie_setup(pci);
+ dw_pcie_dbi_ro_wr_dis(pci);
+}
+
/**
* dw_pcie_ep_init_registers - Initialize DWC EP specific registers
* @ep: DWC EP device
@@ -687,13 +703,11 @@ int dw_pcie_ep_init_registers(struct dw_pcie_ep *ep)
struct dw_pcie_ep_func *ep_func;
struct device *dev = pci->dev;
struct pci_epc *epc = ep->epc;
- unsigned int offset, ptm_cap_base;
- unsigned int nbars;
+ u32 ptm_cap_base, reg;
u8 hdr_type;
u8 func_no;
- int i, ret;
void *addr;
- u32 reg;
+ int ret;
hdr_type = dw_pcie_readb_dbi(pci, PCI_HEADER_TYPE) &
PCI_HEADER_TYPE_MASK;
@@ -756,25 +770,8 @@ int dw_pcie_ep_init_registers(struct dw_pcie_ep *ep)
if (ep->ops->init)
ep->ops->init(ep);
- offset = dw_pcie_ep_find_ext_capability(pci, PCI_EXT_CAP_ID_REBAR);
ptm_cap_base = dw_pcie_ep_find_ext_capability(pci, PCI_EXT_CAP_ID_PTM);
- dw_pcie_dbi_ro_wr_en(pci);
-
- if (offset) {
- reg = dw_pcie_readl_dbi(pci, offset + PCI_REBAR_CTRL);
- nbars = (reg & PCI_REBAR_CTRL_NBAR_MASK) >>
- PCI_REBAR_CTRL_NBAR_SHIFT;
-
- /*
- * PCIe r6.0, sec 7.8.6.2 require us to support at least one
- * size in the range from 1 MB to 512 GB. Advertise support
- * for 1 MB BAR size only.
- */
- for (i = 0; i < nbars; i++, offset += PCI_REBAR_CTRL)
- dw_pcie_writel_dbi(pci, offset + PCI_REBAR_CAP, BIT(4));
- }
-
/*
* PTM responder capability can be disabled only after disabling
* PTM root capability.
@@ -791,8 +788,7 @@ int dw_pcie_ep_init_registers(struct dw_pcie_ep *ep)
dw_pcie_dbi_ro_wr_dis(pci);
}
- dw_pcie_setup(pci);
- dw_pcie_dbi_ro_wr_dis(pci);
+ dw_pcie_ep_init_non_sticky_registers(pci);
return 0;
@@ -803,6 +799,43 @@ int dw_pcie_ep_init_registers(struct dw_pcie_ep *ep)
}
EXPORT_SYMBOL_GPL(dw_pcie_ep_init_registers);
+/**
+ * dw_pcie_ep_linkup - Notify EPF drivers about Link Up event
+ * @ep: DWC EP device
+ */
+void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
+{
+ struct pci_epc *epc = ep->epc;
+
+ pci_epc_linkup(epc);
+}
+EXPORT_SYMBOL_GPL(dw_pcie_ep_linkup);
+
+/**
+ * dw_pcie_ep_linkdown - Notify EPF drivers about Link Down event
+ * @ep: DWC EP device
+ *
+ * Non-sticky registers are also initialized before sending the notification to
+ * the EPF drivers. This is needed since the registers need to be initialized
+ * before the link comes back again.
+ */
+void dw_pcie_ep_linkdown(struct dw_pcie_ep *ep)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+ struct pci_epc *epc = ep->epc;
+
+ /*
+ * Initialize the non-sticky DWC registers as they would've reset post
+ * Link Down. This is specifically needed for drivers not supporting
+ * PERST# as they have no way to reinitialize the registers before the
+ * link comes back again.
+ */
+ dw_pcie_ep_init_non_sticky_registers(pci);
+
+ pci_epc_linkdown(epc);
+}
+EXPORT_SYMBOL_GPL(dw_pcie_ep_linkdown);
+
/**
* dw_pcie_ep_init - Initialize the endpoint device
* @ep: DWC EP device
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index f8e5431a207b..152969545b0a 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -668,6 +668,7 @@ static inline void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus,
#ifdef CONFIG_PCIE_DW_EP
void dw_pcie_ep_linkup(struct dw_pcie_ep *ep);
+void dw_pcie_ep_linkdown(struct dw_pcie_ep *ep);
int dw_pcie_ep_init(struct dw_pcie_ep *ep);
int dw_pcie_ep_init_registers(struct dw_pcie_ep *ep);
void dw_pcie_ep_init_notify(struct dw_pcie_ep *ep);
@@ -688,6 +689,10 @@ static inline void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
{
}
+static inline void dw_pcie_ep_linkdown(struct dw_pcie_ep *ep)
+{
+}
+
static inline int dw_pcie_ep_init(struct dw_pcie_ep *ep)
{
return 0;
--
2.25.1
All EP specific resources are enabled during PERST# deassert. As a counter
operation, all resources should be disabled during PERST# assert. There is
no point in skipping that if the link was not enabled.
This will also result in enablement of the resources twice if PERST# got
deasserted again. So remove the check from qcom_pcie_perst_assert() and
disable all the resources unconditionally.
Fixes: f55fee56a631 ("PCI: qcom-ep: Add Qualcomm PCIe Endpoint controller driver")
Reviewed-by: Niklas Cassel <[email protected]>
Tested-by: Niklas Cassel <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
---
drivers/pci/controller/dwc/pcie-qcom-ep.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index 2fb8c15e7a91..50b1635e3cbb 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -500,12 +500,6 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci)
static void qcom_pcie_perst_assert(struct dw_pcie *pci)
{
struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci);
- struct device *dev = pci->dev;
-
- if (pcie_ep->link_status == QCOM_PCIE_EP_LINK_DISABLED) {
- dev_dbg(dev, "Link is already disabled\n");
- return;
- }
dw_pcie_ep_cleanup(&pci->ep);
qcom_pcie_disable_resources(pcie_ep);
--
2.25.1
As per the PCIe base spec r5.0, section 5.2, Link Down event can happen
under any of the following circumstances:
1. Fundamental/Hot reset
2. Link disable transmission by upstream component
3. Moving from L2/L3 to L0
When the event happens, the EPC driver capable of detecting it may pass the
notification to the EPF driver through link_down() callback in 'struct
pci_epc_event_ops'.
While the PCIe spec has not defined the actual behavior of the endpoint
when the Link Down event happens, we may assume that at least the ongoing
transactions need to be stopped as the link won't be active. So let's
cancel the command handler work in the callback implementation
pci_epf_test_link_down(). The work will be started again in
pci_epf_test_link_up() once the link comes back again.
Reviewed-by: Niklas Cassel <[email protected]>
Tested-by: Niklas Cassel <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
---
drivers/pci/endpoint/functions/pci-epf-test.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index c8d0c51ae329..afb28df174c3 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -809,10 +809,20 @@ static int pci_epf_test_link_up(struct pci_epf *epf)
return 0;
}
+static int pci_epf_test_link_down(struct pci_epf *epf)
+{
+ struct pci_epf_test *epf_test = epf_get_drvdata(epf);
+
+ cancel_delayed_work_sync(&epf_test->cmd_handler);
+
+ return 0;
+}
+
static const struct pci_epc_event_ops pci_epf_test_event_ops = {
.epc_init = pci_epf_test_epc_init,
.epc_deinit = pci_epf_test_epc_deinit,
.link_up = pci_epf_test_link_up,
+ .link_down = pci_epf_test_link_down,
};
static int pci_epf_test_alloc_space(struct pci_epf *epf)
--
2.25.1
Bus Master Enable (BME) event that is generated by the Qcom PCIe EP
controller due to host setting the Bus Master Enable bit in the Command
register doesn't have anything to do with the PCIe link.
Hence, drop the bogus statement.
Suggested-by: Bjorn Helgaas <[email protected]>
Signed-off-by: Manivannan Sadhasivam <[email protected]>
---
drivers/pci/controller/dwc/pcie-qcom-ep.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index f6e925d434f6..dcac177b55fb 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -636,7 +636,7 @@ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data)
pcie_ep->link_status = QCOM_PCIE_EP_LINK_DOWN;
pci_epc_linkdown(pci->ep.epc);
} else if (FIELD_GET(PARF_INT_ALL_BME, status)) {
- dev_dbg(dev, "Received Bus Master Enable event. Link is enabled!\n");
+ dev_dbg(dev, "Received Bus Master Enable event\n");
pcie_ep->link_status = QCOM_PCIE_EP_LINK_ENABLED;
qcom_pcie_ep_icc_update(pcie_ep);
pci_epc_bus_master_enable_notify(pci->ep.epc);
--
2.25.1
On Tue, Apr 30, 2024 at 11:43:45AM +0530, Manivannan Sadhasivam wrote:
> Bus Master Enable (BME) event that is generated by the Qcom PCIe EP
> controller due to host setting the Bus Master Enable bit in the Command
> register doesn't have anything to do with the PCIe link.
>
> Hence, drop the bogus statement.
>
> Suggested-by: Bjorn Helgaas <[email protected]>
> Signed-off-by: Manivannan Sadhasivam <[email protected]>
> ---
> drivers/pci/controller/dwc/pcie-qcom-ep.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
> index f6e925d434f6..dcac177b55fb 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
> @@ -636,7 +636,7 @@ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data)
> pcie_ep->link_status = QCOM_PCIE_EP_LINK_DOWN;
> pci_epc_linkdown(pci->ep.epc);
> } else if (FIELD_GET(PARF_INT_ALL_BME, status)) {
> - dev_dbg(dev, "Received Bus Master Enable event. Link is enabled!\n");
> + dev_dbg(dev, "Received Bus Master Enable event\n");
> pcie_ep->link_status = QCOM_PCIE_EP_LINK_ENABLED;
> qcom_pcie_ep_icc_update(pcie_ep);
> pci_epc_bus_master_enable_notify(pci->ep.epc);
>
> --
> 2.25.1
>
Reviewed-by: Niklas Cassel <[email protected]>