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From:   Niklas Cassel <niklas.cassel@axis.com>
To:     kishon@ti.com, cyrille.pitchen@free-electrons.com,
        Alan Douglas <adouglas@cadence.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Jingoo Han <jingoohan1@gmail.com>,
        Joao Pinto <Joao.Pinto@synopsys.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Sekhar Nori <nsekhar@ti.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Shawn Lin <shawn.lin@rock-chips.com>,
        Niklas Cassel <niklass@axis.com>,
        John Keeping <john@metanate.com>
Cc:     Niklas Cassel <niklass@axis.com>, linux-pci@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH v5 02/12] PCI: endpoint: Simplify epc->ops->set_bar()/pci_epc_set_bar()
Date:   Wed, 28 Mar 2018 13:50:07 +0200
Message-Id: <20180328115018.31921-3-niklas.cassel@axis.com>
In-Reply-To: <20180328115018.31921-1-niklas.cassel@axis.com>
References: <20180328115018.31921-1-niklas.cassel@axis.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Add barno and flags to struct epf_bar.
That way we can simplify epc->ops->set_bar()/pci_epc_set_bar()
by passing a struct *epf_bar instead of a whole lot of arguments.

This is needed so that epc->ops->set_bar() implementations can
modify BAR flags. Will be utilized in a succeeding patch.

Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
---
It is not trivial to convert the bar_size + bar_flags +
struct pci_epf->bar member array to an array of struct resources,
since we need to be able to store the addresses returned
by dma_alloc_coherent(), which is of type dma_addr_t.
struct resource uses resource_size_t, which is defined as phys_addr_t.
E.g. ARTPEC-7 uses 64-bit dma_addr_t, but only 32-bit phys_addr_t.

 drivers/pci/cadence/pcie-cadence-ep.c         |  9 ++++++---
 drivers/pci/dwc/pcie-designware-ep.c          |  8 +++++---
 drivers/pci/endpoint/functions/pci-epf-test.c |  8 ++------
 drivers/pci/endpoint/pci-epc-core.c           | 10 ++++------
 drivers/pci/endpoint/pci-epf-core.c           |  4 ++++
 include/linux/pci-epc.h                       |  6 ++----
 include/linux/pci-epf.h                       |  2 ++
 7 files changed, 25 insertions(+), 22 deletions(-)

diff --git a/drivers/pci/cadence/pcie-cadence-ep.c b/drivers/pci/cadence/pcie-cadence-ep.c
index 3c3a97743453..cef36cd6b710 100644
--- a/drivers/pci/cadence/pcie-cadence-ep.c
+++ b/drivers/pci/cadence/pcie-cadence-ep.c
@@ -77,16 +77,19 @@ static int cdns_pcie_ep_write_header(struct pci_epc *epc, u8 fn,
 	return 0;
 }
 
-static int cdns_pcie_ep_set_bar(struct pci_epc *epc, u8 fn, enum pci_barno bar,
-				dma_addr_t bar_phys, size_t size, int flags)
+static int cdns_pcie_ep_set_bar(struct pci_epc *epc, u8 fn,
+				struct pci_epf_bar *epf_bar)
 {
 	struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
 	struct cdns_pcie *pcie = &ep->pcie;
+	dma_addr_t bar_phys = epf_bar->phys_addr;
+	enum pci_barno bar = epf_bar->barno;
+	int flags = epf_bar->flags;
 	u32 addr0, addr1, reg, cfg, b, aperture, ctrl;
 	u64 sz;
 
 	/* BAR size is 2^(aperture + 7) */
-	sz = max_t(size_t, size, CDNS_PCIE_EP_MIN_APERTURE);
+	sz = max_t(size_t, epf_bar->size, CDNS_PCIE_EP_MIN_APERTURE);
 	/*
 	 * roundup_pow_of_two() returns an unsigned long, which is not suited
 	 * for 64bit values.
diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
index 9236b998327f..5a0bb53c795c 100644
--- a/drivers/pci/dwc/pcie-designware-ep.c
+++ b/drivers/pci/dwc/pcie-designware-ep.c
@@ -117,12 +117,14 @@ static void dw_pcie_ep_clear_bar(struct pci_epc *epc, u8 func_no,
 }
 
 static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no,
-			      enum pci_barno bar,
-			      dma_addr_t bar_phys, size_t size, int flags)
+			      struct pci_epf_bar *epf_bar)
 {
 	int ret;
 	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;
+	size_t size = epf_bar->size;
+	int flags = epf_bar->flags;
 	enum dw_pcie_as_type as_type;
 	u32 reg = PCI_BASE_ADDRESS_0 + (4 * bar);
 
@@ -131,7 +133,7 @@ static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no,
 	else
 		as_type = DW_PCIE_AS_IO;
 
-	ret = dw_pcie_ep_inbound_atu(ep, bar, bar_phys, as_type);
+	ret = dw_pcie_ep_inbound_atu(ep, bar, epf_bar->phys_addr, as_type);
 	if (ret)
 		return ret;
 
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index f6c0c59b1bc8..91274779e59f 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -358,7 +358,6 @@ static void pci_epf_test_unbind(struct pci_epf *epf)
 
 static int pci_epf_test_set_bar(struct pci_epf *epf)
 {
-	int flags;
 	int bar;
 	int ret;
 	struct pci_epf_bar *epf_bar;
@@ -370,14 +369,11 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
 	for (bar = BAR_0; bar <= BAR_5; bar++) {
 		epf_bar = &epf->bar[bar];
 
-		flags = PCI_BASE_ADDRESS_SPACE_MEMORY;
-		flags |= upper_32_bits(epf_bar->size) ?
+		epf_bar->flags |= upper_32_bits(epf_bar->size) ?
 			PCI_BASE_ADDRESS_MEM_TYPE_64 :
 			PCI_BASE_ADDRESS_MEM_TYPE_32;
 
-		ret = pci_epc_set_bar(epc, epf->func_no, bar,
-				      epf_bar->phys_addr,
-				      epf_bar->size, flags);
+		ret = pci_epc_set_bar(epc, epf->func_no, epf_bar);
 		if (ret) {
 			pci_epf_free_space(epf, epf_test->reg[bar], bar);
 			dev_err(dev, "failed to set BAR%d\n", bar);
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index e245bba0ab53..784e33d6f229 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -300,14 +300,12 @@ EXPORT_SYMBOL_GPL(pci_epc_clear_bar);
  * pci_epc_set_bar() - configure BAR in order for host to assign PCI addr space
  * @epc: the EPC device on which BAR has to be configured
  * @func_no: the endpoint function number in the EPC device
- * @bar: the BAR number that has to be configured
- * @size: the size of the addr space
- * @flags: specify memory allocation/io allocation/32bit address/64 bit address
+ * @epf_bar: the struct epf_bar that contains the BAR information
  *
  * Invoke to configure the BAR of the endpoint device.
  */
-int pci_epc_set_bar(struct pci_epc *epc, u8 func_no, enum pci_barno bar,
-		    dma_addr_t bar_phys, size_t size, int flags)
+int pci_epc_set_bar(struct pci_epc *epc, u8 func_no,
+		    struct pci_epf_bar *epf_bar)
 {
 	int ret;
 	unsigned long irq_flags;
@@ -319,7 +317,7 @@ int pci_epc_set_bar(struct pci_epc *epc, u8 func_no, enum pci_barno bar,
 		return 0;
 
 	spin_lock_irqsave(&epc->lock, irq_flags);
-	ret = epc->ops->set_bar(epc, func_no, bar, bar_phys, size, flags);
+	ret = epc->ops->set_bar(epc, func_no, epf_bar);
 	spin_unlock_irqrestore(&epc->lock, irq_flags);
 
 	return ret;
diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c
index 59ed29e550e9..465b5f058b6d 100644
--- a/drivers/pci/endpoint/pci-epf-core.c
+++ b/drivers/pci/endpoint/pci-epf-core.c
@@ -98,6 +98,8 @@ void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar)
 
 	epf->bar[bar].phys_addr = 0;
 	epf->bar[bar].size = 0;
+	epf->bar[bar].barno = 0;
+	epf->bar[bar].flags = 0;
 }
 EXPORT_SYMBOL_GPL(pci_epf_free_space);
 
@@ -126,6 +128,8 @@ void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar)
 
 	epf->bar[bar].phys_addr = phys_addr;
 	epf->bar[bar].size = size;
+	epf->bar[bar].barno = bar;
+	epf->bar[bar].flags = PCI_BASE_ADDRESS_SPACE_MEMORY;
 
 	return space;
 }
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index a1a5e5df0f66..75bae8aabbf9 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -39,8 +39,7 @@ struct pci_epc_ops {
 	int	(*write_header)(struct pci_epc *epc, u8 func_no,
 				struct pci_epf_header *hdr);
 	int	(*set_bar)(struct pci_epc *epc, u8 func_no,
-			   enum pci_barno bar,
-			   dma_addr_t bar_phys, size_t size, int flags);
+			   struct pci_epf_bar *epf_bar);
 	void	(*clear_bar)(struct pci_epc *epc, u8 func_no,
 			     enum pci_barno bar);
 	int	(*map_addr)(struct pci_epc *epc, u8 func_no,
@@ -127,8 +126,7 @@ void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf);
 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,
-		    enum pci_barno bar,
-		    dma_addr_t bar_phys, size_t size, int flags);
+		    struct pci_epf_bar *epf_bar);
 void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, int bar);
 int pci_epc_map_addr(struct pci_epc *epc, u8 func_no,
 		     phys_addr_t phys_addr,
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index e897bf076701..f7d6f4883f8b 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -97,6 +97,8 @@ struct pci_epf_driver {
 struct pci_epf_bar {
 	dma_addr_t	phys_addr;
 	size_t		size;
+	enum pci_barno	barno;
+	int		flags;
 };
 
 /**
-- 
2.14.2