linux-kernel - [PATCH 03/11] platform/x86/intel/vsec: Add base address field

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Message-Id: <20230315183405.2465630-4-david.e.box@linux.intel.com>
Date:   Wed, 15 Mar 2023 11:33:57 -0700
From:   "David E. Box" <david.e.box@...ux.intel.com>
To:     irenic.rajneesh@...il.com, david.e.box@...ux.intel.com,
        hdegoede@...hat.com, markgross@...nel.org,
        andy.shevchenko@...il.com, rajvi.jingar@...ux.intel.com,
        xi.pardee@...el.com
Cc:     linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org
Subject: [PATCH 03/11] platform/x86/intel/vsec: Add base address field

Some Intel PCIe VSEC capabilities may be emulated in MMIO. In such cases
the BAR is not readable from config space. Provide a field for drivers to
indicate the base address that is to be used.

Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
---
 drivers/platform/x86/intel/pmt/class.c | 14 +++++++++++---
 drivers/platform/x86/intel/vsec.c      | 10 ++++++++--
 drivers/platform/x86/intel/vsec.h      |  2 ++
 3 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/intel/pmt/class.c b/drivers/platform/x86/intel/pmt/class.c
index 9f505c6ef278..7136475d4ab5 100644
--- a/drivers/platform/x86/intel/pmt/class.c
+++ b/drivers/platform/x86/intel/pmt/class.c
@@ -161,10 +161,11 @@ static struct class intel_pmt_class = {
 
 static int intel_pmt_populate_entry(struct intel_pmt_entry *entry,
 				    struct intel_pmt_header *header,
-				    struct device *dev,
+				    struct intel_vsec_device *ivdev,
 				    struct resource *disc_res)
 {
-	struct pci_dev *pci_dev = to_pci_dev(dev->parent);
+	struct pci_dev *pci_dev = ivdev->pcidev;
+	struct device *dev = &ivdev->auxdev.dev;
 	u8 bir;
 
 	/*
@@ -216,6 +217,13 @@ static int intel_pmt_populate_entry(struct intel_pmt_entry *entry,
 
 		break;
 	case ACCESS_BARID:
+		/* Use the provided base address if it exists */
+		if (ivdev->base_addr) {
+			entry->base_addr = ivdev->base_addr +
+				   GET_ADDRESS(header->base_offset);
+			break;
+		}
+
 		/*
 		 * If another BAR was specified then the base offset
 		 * represents the offset within that BAR. SO retrieve the
@@ -320,7 +328,7 @@ int intel_pmt_dev_create(struct intel_pmt_entry *entry, struct intel_pmt_namespa
 	if (ret)
 		return ret;
 
-	ret = intel_pmt_populate_entry(entry, &header, dev, disc_res);
+	ret = intel_pmt_populate_entry(entry, &header, intel_vsec_dev, disc_res);
 	if (ret)
 		return ret;
 
diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
index 0d5cf250e288..77063f699a1d 100644
--- a/drivers/platform/x86/intel/vsec.c
+++ b/drivers/platform/x86/intel/vsec.c
@@ -153,6 +153,7 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 	struct intel_vsec_device *intel_vsec_dev;
 	struct resource *res, *tmp;
 	unsigned long quirks = info->quirks;
+	u64 base_addr;
 	int i;
 
 	if (!intel_vsec_supported(header->id, info->caps))
@@ -181,14 +182,18 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 	if (quirks & VSEC_QUIRK_TABLE_SHIFT)
 		header->offset >>= TABLE_OFFSET_SHIFT;
 
+	if (info->base_addr)
+		base_addr = info->base_addr;
+	else
+		base_addr = pdev->resource[header->tbir].start;
+
 	/*
 	 * The DVSEC/VSEC contains the starting offset and count for a block of
 	 * discovery tables. Create a resource array of these tables to the
 	 * auxiliary device driver.
 	 */
 	for (i = 0, tmp = res; i < header->num_entries; i++, tmp++) {
-		tmp->start = pdev->resource[header->tbir].start +
-			     header->offset + i * (header->entry_size * sizeof(u32));
+		tmp->start = base_addr + header->offset + i * (header->entry_size * sizeof(u32));
 		tmp->end = tmp->start + (header->entry_size * sizeof(u32)) - 1;
 		tmp->flags = IORESOURCE_MEM;
 
@@ -206,6 +211,7 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
 	intel_vsec_dev->resource = res;
 	intel_vsec_dev->num_resources = header->num_entries;
 	intel_vsec_dev->quirks = info->quirks;
+	intel_vsec_dev->base_addr = info->base_addr;
 
 	if (header->id == VSEC_ID_SDSI)
 		intel_vsec_dev->ida = &intel_vsec_sdsi_ida;
diff --git a/drivers/platform/x86/intel/vsec.h b/drivers/platform/x86/intel/vsec.h
index 54fdea93f762..4157ec546cd3 100644
--- a/drivers/platform/x86/intel/vsec.h
+++ b/drivers/platform/x86/intel/vsec.h
@@ -74,6 +74,7 @@ struct intel_vsec_platform_info {
 	struct intel_vsec_header **headers;
 	unsigned long caps;
 	unsigned long quirks;
+	u64 base_addr;
 };
 
 struct intel_vsec_device {
@@ -86,6 +87,7 @@ struct intel_vsec_device {
 	void *priv_data;
 	size_t priv_data_size;
 	unsigned long quirks;
+	u64 base_addr;
 };
 
 int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
-- 
2.34.1