Merge branch 'pci/endpoint'

- Make pci_epf_bus_type const (Ricardo B. Marliere)

- Update pci_epf_alloc_space() interface and move bar_fixed_size[] testing
  from pci_epf_test_alloc_space() and pci_epf_configure_bar() into it
  (Niklas Cassel)

- Drop redundant size & alignment checking from epf_ntb_db_bar_init() since
  pci_epf_alloc_space() already does it (Niklas Cassel)

- Fix ntb_register_device() name leak in error path (Yang Yingliang)

- Return actual error code for pci_vntb_probe() failure (Yang Yingliang)

- Prefix sysfs function names with "pci_epf_mhi_", e.g.,
  "/sys/kernel/config/functions/pci_epf_mhi_sdx55", to leave room for other
  endpoint functions (Manivannan Sadhasivam)

- Add EPF MHI support for SA8775P SoC (Mrinmay Sarkar)

- Consolidate endpoint BAR hardware description in new struct
  pci_epc_bar_desc (Niklas Cassel)

- Drop only_64bit on reserved BARs (Niklas Cassel)

* pci/endpoint:
  PCI: endpoint: Drop only_64bit on reserved BARs
  PCI: endpoint: Clean up hardware description for BARs
  PCI: epf-mhi: Add support for SA8775P SoC
  PCI: epf-mhi: Add "pci_epf_mhi_" prefix to the function names
  PCI: epf-vntb: Return actual error code during pci_vntb_probe() failure
  NTB: fix possible name leak in ntb_register_device()
  PCI: endpoint: pci-epf-vntb: Remove superfluous checks for pci_epf_alloc_space() API
  PCI: endpoint: pci-epf-test: Remove superfluous checks for pci_epf_alloc_space() API
  PCI: endpoint: Improve pci_epf_alloc_space() API
  PCI: endpoint: Refactor pci_epf_alloc_space() API
  PCI: endpoint: Make pci_epf_bus_type const

14 files changed, 107 insertions, 82 deletions

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index dc2c036ab28c..47a9a96484ed 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -1081,7 +1081,8 @@ static const struct pci_epc_features imx8m_pcie_epc_features = {
 	.linkup_notifier = false,
 	.msi_capable = true,
 	.msix_capable = false,
-	.reserved_bar = 1 << BAR_1 | 1 << BAR_3,
+	.bar[BAR_1] = { .type = BAR_RESERVED, },
+	.bar[BAR_3] = { .type = BAR_RESERVED, },
 	.align = SZ_64K,
 };
 
diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index c0c62533a3f1..844de4418724 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -924,12 +924,12 @@ static const struct pci_epc_features ks_pcie_am654_epc_features = {
 	.linkup_notifier = false,
 	.msi_capable = true,
 	.msix_capable = true,
-	.reserved_bar = 1 << BAR_0 | 1 << BAR_1,
-	.bar_fixed_64bit = 1 << BAR_0,
-	.bar_fixed_size[2] = SZ_1M,
-	.bar_fixed_size[3] = SZ_64K,
-	.bar_fixed_size[4] = 256,
-	.bar_fixed_size[5] = SZ_1M,
+	.bar[BAR_0] = { .type = BAR_RESERVED, },
+	.bar[BAR_1] = { .type = BAR_RESERVED, },
+	.bar[BAR_2] = { .type = BAR_FIXED, .fixed_size = SZ_1M, },
+	.bar[BAR_3] = { .type = BAR_FIXED, .fixed_size = SZ_64K, },
+	.bar[BAR_4] = { .type = BAR_FIXED, .fixed_size = 256, },
+	.bar[BAR_5] = { .type = BAR_FIXED, .fixed_size = SZ_1M, },
 	.align = SZ_1M,
 };
 
diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c b/drivers/pci/controller/dwc/pci-layerscape-ep.c
index 2e398494e7c0..1f6ee1460ec2 100644
--- a/drivers/pci/controller/dwc/pci-layerscape-ep.c
+++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c
@@ -250,7 +250,10 @@ static int __init ls_pcie_ep_probe(struct platform_device *pdev)
 	pci->dev = dev;
 	pci->ops = pcie->drvdata->dw_pcie_ops;
 
-	ls_epc->bar_fixed_64bit = (1 << BAR_2) | (1 << BAR_4);
+	ls_epc->bar[BAR_2].only_64bit = true;
+	ls_epc->bar[BAR_3].type = BAR_RESERVED;
+	ls_epc->bar[BAR_4].only_64bit = true;
+	ls_epc->bar[BAR_5].type = BAR_RESERVED;
 	ls_epc->linkup_notifier = true;
 
 	pcie->pci = pci;
diff --git a/drivers/pci/controller/dwc/pcie-keembay.c b/drivers/pci/controller/dwc/pcie-keembay.c
index 208d3b0ba196..5e8e54f597dd 100644
--- a/drivers/pci/controller/dwc/pcie-keembay.c
+++ b/drivers/pci/controller/dwc/pcie-keembay.c
@@ -312,8 +312,12 @@ static const struct pci_epc_features keembay_pcie_epc_features = {
 	.linkup_notifier	= false,
 	.msi_capable		= true,
 	.msix_capable		= true,
-	.reserved_bar		= BIT(BAR_1) | BIT(BAR_3) | BIT(BAR_5),
-	.bar_fixed_64bit	= BIT(BAR_0) | BIT(BAR_2) | BIT(BAR_4),
+	.bar[BAR_0]		= { .only_64bit = true, },
+	.bar[BAR_1]		= { .type = BAR_RESERVED, },
+	.bar[BAR_2]		= { .only_64bit = true, },
+	.bar[BAR_3]		= { .type = BAR_RESERVED, },
+	.bar[BAR_4]		= { .only_64bit = true, },
+	.bar[BAR_5]		= { .type = BAR_RESERVED, },
 	.align			= SZ_16K,
 };
 
diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
index e9166619b1f9..0be760ed420b 100644
--- a/drivers/pci/controller/dwc/pcie-rcar-gen4.c
+++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
@@ -383,7 +383,9 @@ static const struct pci_epc_features rcar_gen4_pcie_epc_features = {
 	.linkup_notifier = false,
 	.msi_capable = true,
 	.msix_capable = false,
-	.reserved_bar = 1 << BAR_1 | 1 << BAR_3 | 1 << BAR_5,
+	.bar[BAR_1] = { .type = BAR_RESERVED, },
+	.bar[BAR_3] = { .type = BAR_RESERVED, },
+	.bar[BAR_5] = { .type = BAR_RESERVED, },
 	.align = SZ_1M,
 };
 
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 7afa9e9aabe2..1f7b662cb8e1 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -2007,9 +2007,13 @@ static const struct pci_epc_features tegra_pcie_epc_features = {
 	.core_init_notifier = true,
 	.msi_capable = false,
 	.msix_capable = false,
-	.reserved_bar = 1 << BAR_2 | 1 << BAR_3 | 1 << BAR_4 | 1 << BAR_5,
-	.bar_fixed_64bit = 1 << BAR_0,
-	.bar_fixed_size[0] = SZ_1M,
+	.bar[BAR_0] = { .type = BAR_FIXED, .fixed_size = SZ_1M,
+			.only_64bit = true, },
+	.bar[BAR_1] = { .type = BAR_RESERVED, },
+	.bar[BAR_2] = { .type = BAR_RESERVED, },
+	.bar[BAR_3] = { .type = BAR_RESERVED, },
+	.bar[BAR_4] = { .type = BAR_RESERVED, },
+	.bar[BAR_5] = { .type = BAR_RESERVED, },
 };
 
 static const struct pci_epc_features*
diff --git a/drivers/pci/controller/dwc/pcie-uniphier-ep.c b/drivers/pci/controller/dwc/pcie-uniphier-ep.c
index 3fced0d3e851..639bc2e12476 100644
--- a/drivers/pci/controller/dwc/pcie-uniphier-ep.c
+++ b/drivers/pci/controller/dwc/pcie-uniphier-ep.c
@@ -411,8 +411,12 @@ static const struct uniphier_pcie_ep_soc_data uniphier_pro5_data = {
 		.msi_capable = true,
 		.msix_capable = false,
 		.align = 1 << 16,
-		.bar_fixed_64bit = BIT(BAR_0) | BIT(BAR_2) | BIT(BAR_4),
-		.reserved_bar =  BIT(BAR_4),
+		.bar[BAR_0] = { .only_64bit = true, },
+		.bar[BAR_1] = { .type = BAR_RESERVED, },
+		.bar[BAR_2] = { .only_64bit = true, },
+		.bar[BAR_3] = { .type = BAR_RESERVED, },
+		.bar[BAR_4] = { .type = BAR_RESERVED, },
+		.bar[BAR_5] = { .type = BAR_RESERVED, },
 	},
 };
 
@@ -425,7 +429,12 @@ static const struct uniphier_pcie_ep_soc_data uniphier_nx1_data = {
 		.msi_capable = true,
 		.msix_capable = false,
 		.align = 1 << 12,
-		.bar_fixed_64bit = BIT(BAR_0) | BIT(BAR_2) | BIT(BAR_4),
+		.bar[BAR_0] = { .only_64bit = true, },
+		.bar[BAR_1] = { .type = BAR_RESERVED, },
+		.bar[BAR_2] = { .only_64bit = true, },
+		.bar[BAR_3] = { .type = BAR_RESERVED, },
+		.bar[BAR_4] = { .only_64bit = true, },
+		.bar[BAR_5] = { .type = BAR_RESERVED, },
 	},
 };
 
diff --git a/drivers/pci/controller/pcie-rcar-ep.c b/drivers/pci/controller/pcie-rcar-ep.c
index e6909271def7..05967c6c0b42 100644
--- a/drivers/pci/controller/pcie-rcar-ep.c
+++ b/drivers/pci/controller/pcie-rcar-ep.c
@@ -440,11 +440,15 @@ static const struct pci_epc_features rcar_pcie_epc_features = {
 	.msi_capable = true,
 	.msix_capable = false,
 	/* use 64-bit BARs so mark BAR[1,3,5] as reserved */
-	.reserved_bar = 1 << BAR_1 | 1 << BAR_3 | 1 << BAR_5,
-	.bar_fixed_64bit = 1 << BAR_0 | 1 << BAR_2 | 1 << BAR_4,
-	.bar_fixed_size[0] = 128,
-	.bar_fixed_size[2] = 256,
-	.bar_fixed_size[4] = 256,
+	.bar[BAR_0] = { .type = BAR_FIXED, .fixed_size = 128,
+			.only_64bit = true, },
+	.bar[BAR_1] = { .type = BAR_RESERVED, },
+	.bar[BAR_2] = { .type = BAR_FIXED, .fixed_size = 256,
+			.only_64bit = true, },
+	.bar[BAR_3] = { .type = BAR_RESERVED, },
+	.bar[BAR_4] = { .type = BAR_FIXED, .fixed_size = 256,
+			.only_64bit = true, },
+	.bar[BAR_5] = { .type = BAR_RESERVED, },
 };
 
 static const struct pci_epc_features*
diff --git a/drivers/pci/endpoint/functions/pci-epf-mhi.c b/drivers/pci/endpoint/functions/pci-epf-mhi.c
index 1c3e4ea76bd2..2c54d80107cf 100644
--- a/drivers/pci/endpoint/functions/pci-epf-mhi.c
+++ b/drivers/pci/endpoint/functions/pci-epf-mhi.c
@@ -123,6 +123,22 @@ static const struct pci_epf_mhi_ep_info sm8450_info = {
 	.flags = MHI_EPF_USE_DMA,
 };
 
+static struct pci_epf_header sa8775p_header = {
+	.vendorid = PCI_VENDOR_ID_QCOM,
+	.deviceid = 0x0306,               /* FIXME: Update deviceid for sa8775p EP */
+	.baseclass_code = PCI_CLASS_OTHERS,
+	.interrupt_pin = PCI_INTERRUPT_INTA,
+};
+
+static const struct pci_epf_mhi_ep_info sa8775p_info = {
+	.config = &mhi_v1_config,
+	.epf_header = &sa8775p_header,
+	.bar_num = BAR_0,
+	.epf_flags = PCI_BASE_ADDRESS_MEM_TYPE_32,
+	.msi_count = 32,
+	.mru = 0x8000,
+};
+
 struct pci_epf_mhi {
 	const struct pci_epc_features *epc_features;
 	const struct pci_epf_mhi_ep_info *info;
@@ -913,8 +929,9 @@ static int pci_epf_mhi_probe(struct pci_epf *epf,
 }
 
 static const struct pci_epf_device_id pci_epf_mhi_ids[] = {
-	{ .name = "sdx55", .driver_data = (kernel_ulong_t)&sdx55_info },
-	{ .name = "sm8450", .driver_data = (kernel_ulong_t)&sm8450_info },
+	{ .name = "pci_epf_mhi_sa8775p", .driver_data = (kernel_ulong_t)&sa8775p_info },
+	{ .name = "pci_epf_mhi_sdx55", .driver_data = (kernel_ulong_t)&sdx55_info },
+	{ .name = "pci_epf_mhi_sm8450", .driver_data = (kernel_ulong_t)&sm8450_info },
 	{},
 };
 
diff --git a/drivers/pci/endpoint/functions/pci-epf-ntb.c b/drivers/pci/endpoint/functions/pci-epf-ntb.c
index 0553946005c4..e01a98e74d21 100644
--- a/drivers/pci/endpoint/functions/pci-epf-ntb.c
+++ b/drivers/pci/endpoint/functions/pci-epf-ntb.c
@@ -1012,13 +1012,13 @@ static int epf_ntb_config_spad_bar_alloc(struct epf_ntb *ntb,
 
 	epc_features = ntb_epc->epc_features;
 	barno = ntb_epc->epf_ntb_bar[BAR_CONFIG];
-	size = epc_features->bar_fixed_size[barno];
+	size = epc_features->bar[barno].fixed_size;
 	align = epc_features->align;
 
 	peer_ntb_epc = ntb->epc[!type];
 	peer_epc_features = peer_ntb_epc->epc_features;
 	peer_barno = ntb_epc->epf_ntb_bar[BAR_PEER_SPAD];
-	peer_size = peer_epc_features->bar_fixed_size[peer_barno];
+	peer_size = peer_epc_features->bar[peer_barno].fixed_size;
 
 	/* Check if epc_features is populated incorrectly */
 	if ((!IS_ALIGNED(size, align)))
@@ -1067,7 +1067,7 @@ static int epf_ntb_config_spad_bar_alloc(struct epf_ntb *ntb,
 	else if (size < ctrl_size + spad_size)
 		return -EINVAL;
 
-	base = pci_epf_alloc_space(epf, size, barno, align, type);
+	base = pci_epf_alloc_space(epf, size, barno, epc_features, type);
 	if (!base) {
 		dev_err(dev, "%s intf: Config/Status/SPAD alloc region fail\n",
 			pci_epc_interface_string(type));
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 18c80002d3bd..cd4ffb39dcdc 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -729,7 +729,7 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
 		 */
 		add = (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ? 2 : 1;
 
-		if (!!(epc_features->reserved_bar & (1 << bar)))
+		if (epc_features->bar[bar].type == BAR_RESERVED)
 			continue;
 
 		ret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no,
@@ -841,14 +841,8 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf)
 	}
 	test_reg_size = test_reg_bar_size + msix_table_size + pba_size;
 
-	if (epc_features->bar_fixed_size[test_reg_bar]) {
-		if (test_reg_size > bar_size[test_reg_bar])
-			return -ENOMEM;
-		test_reg_size = bar_size[test_reg_bar];
-	}
-
 	base = pci_epf_alloc_space(epf, test_reg_size, test_reg_bar,
-				   epc_features->align, PRIMARY_INTERFACE);
+				   epc_features, PRIMARY_INTERFACE);
 	if (!base) {
 		dev_err(dev, "Failed to allocated register space\n");
 		return -ENOMEM;
@@ -862,12 +856,11 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf)
 		if (bar == test_reg_bar)
 			continue;
 
-		if (!!(epc_features->reserved_bar & (1 << bar)))
+		if (epc_features->bar[bar].type == BAR_RESERVED)
 			continue;
 
 		base = pci_epf_alloc_space(epf, bar_size[bar], bar,
-					   epc_features->align,
-					   PRIMARY_INTERFACE);
+					   epc_features, PRIMARY_INTERFACE);
 		if (!base)
 			dev_err(dev, "Failed to allocate space for BAR%d\n",
 				bar);
@@ -881,16 +874,12 @@ static void pci_epf_configure_bar(struct pci_epf *epf,
 				  const struct pci_epc_features *epc_features)
 {
 	struct pci_epf_bar *epf_bar;
-	bool bar_fixed_64bit;
 	int i;
 
 	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 		epf_bar = &epf->bar[i];
-		bar_fixed_64bit = !!(epc_features->bar_fixed_64bit & (1 << i));
-		if (bar_fixed_64bit)
+		if (epc_features->bar[i].only_64bit)
 			epf_bar->flags |= PCI_BASE_ADDRESS_MEM_TYPE_64;
-		if (epc_features->bar_fixed_size[i])
-			bar_size[i] = epc_features->bar_fixed_size[i];
 	}
 }
 
diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c
index e75a2af77328..8e779eecd62d 100644
--- a/drivers/pci/endpoint/functions/pci-epf-vntb.c
+++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c
@@ -422,7 +422,7 @@ static int epf_ntb_config_spad_bar_alloc(struct epf_ntb *ntb)
 								epf->func_no,
 								epf->vfunc_no);
 	barno = ntb->epf_ntb_bar[BAR_CONFIG];
-	size = epc_features->bar_fixed_size[barno];
+	size = epc_features->bar[barno].fixed_size;
 	align = epc_features->align;
 
 	if ((!IS_ALIGNED(size, align)))
@@ -446,7 +446,7 @@ static int epf_ntb_config_spad_bar_alloc(struct epf_ntb *ntb)
 	else if (size < ctrl_size + spad_size)
 		return -EINVAL;
 
-	base = pci_epf_alloc_space(epf, size, barno, align, 0);
+	base = pci_epf_alloc_space(epf, size, barno, epc_features, 0);
 	if (!base) {
 		dev_err(dev, "Config/Status/SPAD alloc region fail\n");
 		return -ENOMEM;
@@ -527,7 +527,6 @@ static int epf_ntb_configure_interrupt(struct epf_ntb *ntb)
 static int epf_ntb_db_bar_init(struct epf_ntb *ntb)
 {
 	const struct pci_epc_features *epc_features;
-	u32 align;
 	struct device *dev = &ntb->epf->dev;
 	int ret;
 	struct pci_epf_bar *epf_bar;
@@ -538,19 +537,9 @@ static int epf_ntb_db_bar_init(struct epf_ntb *ntb)
 	epc_features = pci_epc_get_features(ntb->epf->epc,
 					    ntb->epf->func_no,
 					    ntb->epf->vfunc_no);
-	align = epc_features->align;
-
-	if (size < 128)
-		size = 128;
-
-	if (align)
-		size = ALIGN(size, align);
-	else
-		size = roundup_pow_of_two(size);
-
 	barno = ntb->epf_ntb_bar[BAR_DB];
 
-	mw_addr = pci_epf_alloc_space(ntb->epf, size, barno, align, 0);
+	mw_addr = pci_epf_alloc_space(ntb->epf, size, barno, epc_features, 0);
 	if (!mw_addr) {
 		dev_err(dev, "Failed to allocate OB address\n");
 		return -ENOMEM;
@@ -1269,21 +1258,17 @@ static int pci_vntb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 	if (ret) {
 		dev_err(dev, "Cannot set DMA mask\n");
-		return -EINVAL;
+		return ret;
 	}
 
 	ret = ntb_register_device(&ndev->ntb);
 	if (ret) {
 		dev_err(dev, "Failed to register NTB device\n");
-		goto err_register_dev;
+		return ret;
 	}
 
 	dev_dbg(dev, "PCI Virtual NTB driver loaded\n");
 	return 0;
-
-err_register_dev:
-	put_device(&ndev->ntb.dev);
-	return -EINVAL;
 }
 
 static struct pci_device_id pci_vntb_table[] = {
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index dcd4e66430c1..da3fc0795b0b 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -87,7 +87,7 @@ EXPORT_SYMBOL_GPL(pci_epc_get);
  * @epc_features: pci_epc_features structure that holds the reserved bar bitmap
  *
  * Invoke to get the first unreserved BAR that can be used by the endpoint
- * function. For any incorrect value in reserved_bar return '0'.
+ * function.
  */
 enum pci_barno
 pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features)
@@ -102,32 +102,27 @@ EXPORT_SYMBOL_GPL(pci_epc_get_first_free_bar);
  * @bar: the starting BAR number from where unreserved BAR should be searched
  *
  * Invoke to get the next unreserved BAR starting from @bar that can be used
- * for endpoint function. For any incorrect value in reserved_bar return '0'.
+ * for endpoint function.
  */
 enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features
 					 *epc_features, enum pci_barno bar)
 {
-	unsigned long free_bar;
+	int i;
 
 	if (!epc_features)
 		return BAR_0;
 
 	/* If 'bar - 1' is a 64-bit BAR, move to the next BAR */
-	if ((epc_features->bar_fixed_64bit << 1) & 1 << bar)
+	if (bar > 0 && epc_features->bar[bar - 1].only_64bit)
 		bar++;
 
-	/* Find if the reserved BAR is also a 64-bit BAR */
-	free_bar = epc_features->reserved_bar & epc_features->bar_fixed_64bit;
-
-	/* Set the adjacent bit if the reserved BAR is also a 64-bit BAR */
-	free_bar <<= 1;
-	free_bar |= epc_features->reserved_bar;
-
-	free_bar = find_next_zero_bit(&free_bar, 6, bar);
-	if (free_bar > 5)
-		return NO_BAR;
+	for (i = bar; i < PCI_STD_NUM_BARS; i++) {
+		/* If the BAR is not reserved, return it. */
+		if (epc_features->bar[i].type != BAR_RESERVED)
+			return i;
+	}
 
-	return free_bar;
+	return NO_BAR;
 }
 EXPORT_SYMBOL_GPL(pci_epc_get_next_free_bar);
 
diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c
index 2c32de667937..0a28a0b0911b 100644
--- a/drivers/pci/endpoint/pci-epf-core.c
+++ b/drivers/pci/endpoint/pci-epf-core.c
@@ -17,7 +17,7 @@
 
 static DEFINE_MUTEX(pci_epf_mutex);
 
-static struct bus_type pci_epf_bus_type;
+static const struct bus_type pci_epf_bus_type;
 static const struct device_type pci_epf_type;
 
 /**
@@ -251,14 +251,17 @@ EXPORT_SYMBOL_GPL(pci_epf_free_space);
  * @epf: the EPF device to whom allocate the memory
  * @size: the size of the memory that has to be allocated
  * @bar: the BAR number corresponding to the allocated register space
- * @align: alignment size for the allocation region
+ * @epc_features: the features provided by the EPC specific to this EPF
  * @type: Identifies if the allocation is for primary EPC or secondary EPC
  *
  * Invoke to allocate memory for the PCI EPF register space.
  */
 void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar,
-			  size_t align, enum pci_epc_interface_type type)
+			  const struct pci_epc_features *epc_features,
+			  enum pci_epc_interface_type type)
 {
+	u64 bar_fixed_size = epc_features->bar[bar].fixed_size;
+	size_t align = epc_features->align;
 	struct pci_epf_bar *epf_bar;
 	dma_addr_t phys_addr;
 	struct pci_epc *epc;
@@ -268,6 +271,15 @@ void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar,
 	if (size < 128)
 		size = 128;
 
+	if (epc_features->bar[bar].type == BAR_FIXED && bar_fixed_size) {
+		if (size > bar_fixed_size) {
+			dev_err(&epf->dev,
+				"requested BAR size is larger than fixed size\n");
+			return NULL;
+		}
+		size = bar_fixed_size;
+	}
+
 	if (align)
 		size = ALIGN(size, align);
 	else
@@ -507,7 +519,7 @@ static void pci_epf_device_remove(struct device *dev)
 	epf->driver = NULL;
 }
 
-static struct bus_type pci_epf_bus_type = {
+static const struct bus_type pci_epf_bus_type = {
 	.name		= "pci-epf",
 	.match		= pci_epf_device_match,
 	.probe		= pci_epf_device_probe,