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Message-Id: <20210922213007.2738388-4-david.e.box@linux.intel.com>
Date: Wed, 22 Sep 2021 14:30:05 -0700
From: "David E. Box" <david.e.box@...ux.intel.com>
To: lee.jones@...aro.org, bhelgaas@...gle.com,
andy.shevchenko@...il.com
Cc: "David E. Box" <david.e.box@...ux.intel.com>,
mgross@...ux.intel.com, srinivas.pandruvada@...el.com,
linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
linux-pci@...r.kernel.org
Subject: [PATCH v3 3/5] MFD: intel_pmt: Add support for PCIe VSEC structures
Adds support for discovering Intel extended capability features from
Vendor Specific Extended Capability (VSEC) registers in PCIe config space.
Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
---
V3: No changes
V2: Drop new driver. Keep changes in intel_pmt.c
drivers/mfd/intel_pmt.c | 158 +++++++++++++++++++++++++++++-----------
1 file changed, 115 insertions(+), 43 deletions(-)
diff --git a/drivers/mfd/intel_pmt.c b/drivers/mfd/intel_pmt.c
index 08cd3357577e..08e07b31aeec 100644
--- a/drivers/mfd/intel_pmt.c
+++ b/drivers/mfd/intel_pmt.c
@@ -40,7 +40,8 @@ static int intel_ext_cap_allow_list[] = {
INTEL_EXT_CAP_ID_CRASHLOG,
};
-struct intel_dvsec_header {
+struct intel_ext_cap_header {
+ u8 rev;
u16 length;
u16 id;
u8 num_entries;
@@ -65,7 +66,7 @@ enum pmt_quirks {
struct pmt_platform_info {
unsigned long quirks;
- struct intel_dvsec_header **capabilities;
+ struct intel_ext_cap_header **capabilities;
};
static const struct pmt_platform_info tgl_info = {
@@ -74,7 +75,7 @@ static const struct pmt_platform_info tgl_info = {
};
/* DG1 Platform with DVSEC quirk*/
-static struct intel_dvsec_header dg1_telemetry = {
+static struct intel_ext_cap_header dg1_telemetry = {
.length = 0x10,
.id = 2,
.num_entries = 1,
@@ -83,7 +84,7 @@ static struct intel_dvsec_header dg1_telemetry = {
.offset = 0x466000,
};
-static struct intel_dvsec_header *dg1_capabilities[] = {
+static struct intel_ext_cap_header *dg1_capabilities[] = {
&dg1_telemetry,
NULL
};
@@ -118,7 +119,7 @@ static bool intel_ext_cap_disabled(u16 id, unsigned long quirks)
}
}
-static int intel_ext_cap_add_dev(struct pci_dev *pdev, struct intel_dvsec_header *header,
+static int intel_ext_cap_add_dev(struct pci_dev *pdev, struct intel_ext_cap_header *header,
unsigned long quirks)
{
struct device *dev = &pdev->dev;
@@ -160,7 +161,7 @@ static int intel_ext_cap_add_dev(struct pci_dev *pdev, struct intel_dvsec_header
header->offset >>= 3;
/*
- * The DVSEC contains the starting offset and count for a block of
+ * The DVSEC/VSEC contains the starting offset and count for a block of
* discovery tables, each providing access to monitoring facilities for
* a section of the device. Create a resource list of these tables to
* provide to the driver.
@@ -179,13 +180,113 @@ static int intel_ext_cap_add_dev(struct pci_dev *pdev, struct intel_dvsec_header
return devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
}
+static bool intel_ext_cap_walk_dvsec(struct pci_dev *pdev, unsigned long quirks)
+{
+ int count = 0;
+ int pos = 0;
+
+ do {
+ struct intel_ext_cap_header header;
+ u32 table, hdr;
+ u16 vid;
+ int ret;
+
+ pos = pci_find_next_ext_capability(pdev, pos, PCI_EXT_CAP_ID_DVSEC);
+ if (!pos)
+ break;
+
+ pci_read_config_dword(pdev, pos + PCI_DVSEC_HEADER1, &hdr);
+ vid = PCI_DVSEC_HEADER1_VID(hdr);
+ if (vid != PCI_VENDOR_ID_INTEL)
+ continue;
+
+ /* Support only revision 1 */
+ header.rev = PCI_DVSEC_HEADER1_REV(hdr);
+ if (header.rev != 1) {
+ dev_warn(&pdev->dev, "Unsupported DVSEC revision %d\n",
+ header.rev);
+ continue;
+ }
+
+ header.length = PCI_DVSEC_HEADER1_LEN(hdr);
+
+ pci_read_config_byte(pdev, pos + INTEL_DVSEC_ENTRIES,
+ &header.num_entries);
+ pci_read_config_byte(pdev, pos + INTEL_DVSEC_SIZE,
+ &header.entry_size);
+ pci_read_config_dword(pdev, pos + INTEL_DVSEC_TABLE,
+ &table);
+
+ header.tbir = INTEL_DVSEC_TABLE_BAR(table);
+ header.offset = INTEL_DVSEC_TABLE_OFFSET(table);
+
+ pci_read_config_dword(pdev, pos + PCI_DVSEC_HEADER2, &hdr);
+ header.id = PCI_DVSEC_HEADER2_ID(hdr);
+
+ ret = intel_ext_cap_add_dev(pdev, &header, quirks);
+ if (ret)
+ continue;
+
+ count++;
+ } while (true);
+
+ return count;
+}
+
+static bool intel_ext_cap_walk_vsec(struct pci_dev *pdev, unsigned long quirks)
+{
+ int count = 0;
+ int pos = 0;
+
+ do {
+ struct intel_ext_cap_header header;
+ u32 table, hdr;
+ int ret;
+
+ pos = pci_find_next_ext_capability(pdev, pos, PCI_EXT_CAP_ID_VNDR);
+ if (!pos)
+ break;
+
+ pci_read_config_dword(pdev, pos + PCI_VNDR_HEADER, &hdr);
+
+ /* Support only revision 1 */
+ header.rev = PCI_VNDR_HEADER_REV(hdr);
+ if (header.rev != 1) {
+ dev_warn(&pdev->dev, "Unsupported VSEC revision %d\n",
+ header.rev);
+ continue;
+ }
+
+ header.id = PCI_VNDR_HEADER_ID(hdr);
+ header.length = PCI_VNDR_HEADER_LEN(hdr);
+
+ /* entry, size, and table offset are the same as DVSEC */
+ pci_read_config_byte(pdev, pos + INTEL_DVSEC_ENTRIES,
+ &header.num_entries);
+ pci_read_config_byte(pdev, pos + INTEL_DVSEC_SIZE,
+ &header.entry_size);
+ pci_read_config_dword(pdev, pos + INTEL_DVSEC_TABLE,
+ &table);
+
+ header.tbir = INTEL_DVSEC_TABLE_BAR(table);
+ header.offset = INTEL_DVSEC_TABLE_OFFSET(table);
+
+ ret = intel_ext_cap_add_dev(pdev, &header, quirks);
+ if (ret)
+ continue;
+
+ count++;
+ } while (true);
+
+ return count;
+}
static int pmt_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct pmt_platform_info *info;
unsigned long quirks = 0;
- bool found_devices = false;
- int ret, pos = 0;
+ int device_count = 0;
+ int ret;
ret = pcim_enable_device(pdev);
if (ret)
@@ -196,8 +297,11 @@ static int pmt_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (info)
quirks = info->quirks;
+ device_count += intel_ext_cap_walk_dvsec(pdev, quirks);
+ device_count += intel_ext_cap_walk_vsec(pdev, quirks);
+
if (info && (info->quirks & PMT_QUIRK_NO_DVSEC)) {
- struct intel_dvsec_header **header;
+ struct intel_ext_cap_header **header;
header = info->capabilities;
while (*header) {
@@ -207,45 +311,13 @@ static int pmt_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
"Failed to add device for DVSEC id %d\n",
(*header)->id);
else
- found_devices = true;
+ device_count++;
++header;
}
- } else {
- do {
- struct intel_dvsec_header header;
- u32 table;
- u16 vid;
-
- pos = pci_find_next_ext_capability(pdev, pos, PCI_EXT_CAP_ID_DVSEC);
- if (!pos)
- break;
-
- pci_read_config_word(pdev, pos + PCI_DVSEC_HEADER1, &vid);
- if (vid != PCI_VENDOR_ID_INTEL)
- continue;
-
- pci_read_config_word(pdev, pos + PCI_DVSEC_HEADER2,
- &header.id);
- pci_read_config_byte(pdev, pos + INTEL_DVSEC_ENTRIES,
- &header.num_entries);
- pci_read_config_byte(pdev, pos + INTEL_DVSEC_SIZE,
- &header.entry_size);
- pci_read_config_dword(pdev, pos + INTEL_DVSEC_TABLE,
- &table);
-
- header.tbir = INTEL_DVSEC_TABLE_BAR(table);
- header.offset = INTEL_DVSEC_TABLE_OFFSET(table);
-
- ret = intel_ext_cap_add_dev(pdev, &header, quirks);
- if (ret)
- continue;
-
- found_devices = true;
- } while (true);
}
- if (!found_devices)
+ if (!device_count)
return -ENODEV;
pm_runtime_put(&pdev->dev);
--
2.25.1
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