PCI: endpoint: Make epc->ops->clear_bar()/pci_epc_clear_bar() take struct *epf_bar

Make epc->ops->clear_bar()/pci_epc_clear_bar() take struct *epf_bar.

This is needed so that epc->ops->clear_bar() can clear the BAR pair,
if the BAR is 64-bits wide.

This also makes it possible for pci_epc_clear_bar() to sanity check
the flags.

Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>

5 files changed, 23 insertions, 10 deletions

diff --git a/drivers/pci/cadence/pcie-cadence-ep.c b/drivers/pci/cadence/pcie-cadence-ep.c
index 2905e098678c..3d8283e450a9 100644
--- a/drivers/pci/cadence/pcie-cadence-ep.c
+++ b/drivers/pci/cadence/pcie-cadence-ep.c
@@ -145,10 +145,11 @@ static int cdns_pcie_ep_set_bar(struct pci_epc *epc, u8 fn,
 }
 
 static void cdns_pcie_ep_clear_bar(struct pci_epc *epc, u8 fn,
-                                   enum pci_barno bar)
+                                   struct pci_epf_bar *epf_bar)
 {
         struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
         struct cdns_pcie *pcie = &ep->pcie;
+        enum pci_barno bar = epf_bar->barno;
         u32 reg, cfg, b, ctrl;
 
         if (bar < BAR_4) {
diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
index 70c8c1eedb42..c9bdb5f139b4 100644
--- a/drivers/pci/dwc/pcie-designware-ep.c
+++ b/drivers/pci/dwc/pcie-designware-ep.c
@@ -19,7 +19,8 @@ void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
         pci_epc_linkup(epc);
 }
 
-void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
+static void __dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar,
+                                   int flags)
 {
         u32 reg;
 
@@ -30,6 +31,11 @@ void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
         dw_pcie_dbi_ro_wr_dis(pci);
 }
 
+void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
+{
+        __dw_pcie_ep_reset_bar(pci, bar, 0);
+}
+
 static int dw_pcie_ep_write_header(struct pci_epc *epc, u8 func_no,
                                    struct pci_epf_header *hdr)
 {
@@ -104,13 +110,14 @@ static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, phys_addr_t phys_addr,
 }
 
 static void dw_pcie_ep_clear_bar(struct pci_epc *epc, u8 func_no,
-                                 enum pci_barno bar)
+                                 struct pci_epf_bar *epf_bar)
 {
         struct dw_pcie_ep *ep = epc_get_drvdata(epc);
         struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+        enum pci_barno bar = epf_bar->barno;
         u32 atu_index = ep->bar_to_atu[bar];
 
-        dw_pcie_ep_reset_bar(pci, bar);
+        __dw_pcie_ep_reset_bar(pci, bar, epf_bar->flags);
 
         dw_pcie_disable_atu(pci, atu_index, DW_PCIE_REGION_INBOUND);
         clear_bit(atu_index, ep->ib_window_map);
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index d46e3ebabb8e..7cef85124325 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -344,14 +344,17 @@ 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;
+        struct pci_epf_bar *epf_bar;
         int bar;
 
         cancel_delayed_work(&epf_test->cmd_handler);
         pci_epc_stop(epc);
         for (bar = BAR_0; bar <= BAR_5; bar++) {
+                epf_bar = &epf->bar[bar];
+
                 if (epf_test->reg[bar]) {
                         pci_epf_free_space(epf, epf_test->reg[bar], bar);
-                        pci_epc_clear_bar(epc, epf->func_no, bar);
+                        pci_epc_clear_bar(epc, epf->func_no, epf_bar);
                 }
         }
 }
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 8637822605ff..eccc942043cb 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -276,11 +276,12 @@ EXPORT_SYMBOL_GPL(pci_epc_map_addr);
  * pci_epc_clear_bar() - reset the BAR
  * @epc: the EPC device for which the BAR has to be cleared
  * @func_no: the endpoint function number in the EPC device
- * @bar: the BAR number that has to be reset
+ * @epf_bar: the struct epf_bar that contains the BAR information
  *
  * Invoke to reset the BAR of the endpoint device.
  */
-void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, int bar)
+void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no,
+                       struct pci_epf_bar *epf_bar)
 {
         unsigned long flags;
 
@@ -291,7 +292,7 @@ void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, int bar)
                 return;
 
         spin_lock_irqsave(&epc->lock, flags);
-        epc->ops->clear_bar(epc, func_no, bar);
+        epc->ops->clear_bar(epc, func_no, epf_bar);
         spin_unlock_irqrestore(&epc->lock, flags);
 }
 EXPORT_SYMBOL_GPL(pci_epc_clear_bar);
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index 75bae8aabbf9..af657ca58b70 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -41,7 +41,7 @@ struct pci_epc_ops {
         int     (*set_bar)(struct pci_epc *epc, u8 func_no,
                            struct pci_epf_bar *epf_bar);
         void    (*clear_bar)(struct pci_epc *epc, u8 func_no,
-                             enum pci_barno bar);
+                             struct pci_epf_bar *epf_bar);
         int     (*map_addr)(struct pci_epc *epc, u8 func_no,
                             phys_addr_t addr, u64 pci_addr, size_t size);
         void    (*unmap_addr)(struct pci_epc *epc, u8 func_no,
@@ -127,7 +127,8 @@ int pci_epc_write_header(struct pci_epc *epc, u8 func_no,
                          struct pci_epf_header *hdr);
 int pci_epc_set_bar(struct pci_epc *epc, u8 func_no,
                     struct pci_epf_bar *epf_bar);
-void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, int bar);
+void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no,
+                       struct pci_epf_bar *epf_bar);
 int pci_epc_map_addr(struct pci_epc *epc, u8 func_no,
                      phys_addr_t phys_addr,
                      u64 pci_addr, size_t size);