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-rw-r--r--drivers/pci/vpd.c652
1 files changed, 652 insertions, 0 deletions
diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
new file mode 100644
index 000000000..bd549070c
--- /dev/null
+++ b/drivers/pci/vpd.c
@@ -0,0 +1,652 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCI VPD support
+ *
+ * Copyright (C) 2010 Broadcom Corporation.
+ */
+
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/sched/signal.h>
+#include "pci.h"
+
+/* VPD access through PCI 2.2+ VPD capability */
+
+struct pci_vpd_ops {
+ ssize_t (*read)(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
+ ssize_t (*write)(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);
+ int (*set_size)(struct pci_dev *dev, size_t len);
+};
+
+struct pci_vpd {
+ const struct pci_vpd_ops *ops;
+ struct bin_attribute *attr; /* Descriptor for sysfs VPD entry */
+ struct mutex lock;
+ unsigned int len;
+ u16 flag;
+ u8 cap;
+ unsigned int busy:1;
+ unsigned int valid:1;
+};
+
+/**
+ * pci_read_vpd - Read one entry from Vital Product Data
+ * @dev: pci device struct
+ * @pos: offset in vpd space
+ * @count: number of bytes to read
+ * @buf: pointer to where to store result
+ */
+ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf)
+{
+ if (!dev->vpd || !dev->vpd->ops)
+ return -ENODEV;
+ return dev->vpd->ops->read(dev, pos, count, buf);
+}
+EXPORT_SYMBOL(pci_read_vpd);
+
+/**
+ * pci_write_vpd - Write entry to Vital Product Data
+ * @dev: pci device struct
+ * @pos: offset in vpd space
+ * @count: number of bytes to write
+ * @buf: buffer containing write data
+ */
+ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf)
+{
+ if (!dev->vpd || !dev->vpd->ops)
+ return -ENODEV;
+ return dev->vpd->ops->write(dev, pos, count, buf);
+}
+EXPORT_SYMBOL(pci_write_vpd);
+
+/**
+ * pci_set_vpd_size - Set size of Vital Product Data space
+ * @dev: pci device struct
+ * @len: size of vpd space
+ */
+int pci_set_vpd_size(struct pci_dev *dev, size_t len)
+{
+ if (!dev->vpd || !dev->vpd->ops)
+ return -ENODEV;
+ return dev->vpd->ops->set_size(dev, len);
+}
+EXPORT_SYMBOL(pci_set_vpd_size);
+
+#define PCI_VPD_MAX_SIZE (PCI_VPD_ADDR_MASK + 1)
+
+/**
+ * pci_vpd_size - determine actual size of Vital Product Data
+ * @dev: pci device struct
+ * @old_size: current assumed size, also maximum allowed size
+ */
+static size_t pci_vpd_size(struct pci_dev *dev, size_t old_size)
+{
+ size_t off = 0;
+ unsigned char header[1+2]; /* 1 byte tag, 2 bytes length */
+
+ while (off < old_size &&
+ pci_read_vpd(dev, off, 1, header) == 1) {
+ unsigned char tag;
+
+ if (header[0] & PCI_VPD_LRDT) {
+ /* Large Resource Data Type Tag */
+ tag = pci_vpd_lrdt_tag(header);
+ /* Only read length from known tag items */
+ if ((tag == PCI_VPD_LTIN_ID_STRING) ||
+ (tag == PCI_VPD_LTIN_RO_DATA) ||
+ (tag == PCI_VPD_LTIN_RW_DATA)) {
+ if (pci_read_vpd(dev, off+1, 2,
+ &header[1]) != 2) {
+ pci_warn(dev, "invalid large VPD tag %02x size at offset %zu",
+ tag, off + 1);
+ return 0;
+ }
+ off += PCI_VPD_LRDT_TAG_SIZE +
+ pci_vpd_lrdt_size(header);
+ }
+ } else {
+ /* Short Resource Data Type Tag */
+ off += PCI_VPD_SRDT_TAG_SIZE +
+ pci_vpd_srdt_size(header);
+ tag = pci_vpd_srdt_tag(header);
+ }
+
+ if (tag == PCI_VPD_STIN_END) /* End tag descriptor */
+ return off;
+
+ if ((tag != PCI_VPD_LTIN_ID_STRING) &&
+ (tag != PCI_VPD_LTIN_RO_DATA) &&
+ (tag != PCI_VPD_LTIN_RW_DATA)) {
+ pci_warn(dev, "invalid %s VPD tag %02x at offset %zu",
+ (header[0] & PCI_VPD_LRDT) ? "large" : "short",
+ tag, off);
+ return 0;
+ }
+ }
+ return 0;
+}
+
+/*
+ * Wait for last operation to complete.
+ * This code has to spin since there is no other notification from the PCI
+ * hardware. Since the VPD is often implemented by serial attachment to an
+ * EEPROM, it may take many milliseconds to complete.
+ *
+ * Returns 0 on success, negative values indicate error.
+ */
+static int pci_vpd_wait(struct pci_dev *dev)
+{
+ struct pci_vpd *vpd = dev->vpd;
+ unsigned long timeout = jiffies + msecs_to_jiffies(125);
+ unsigned long max_sleep = 16;
+ u16 status;
+ int ret;
+
+ if (!vpd->busy)
+ return 0;
+
+ do {
+ ret = pci_user_read_config_word(dev, vpd->cap + PCI_VPD_ADDR,
+ &status);
+ if (ret < 0)
+ return ret;
+
+ if ((status & PCI_VPD_ADDR_F) == vpd->flag) {
+ vpd->busy = 0;
+ return 0;
+ }
+
+ if (fatal_signal_pending(current))
+ return -EINTR;
+
+ if (time_after(jiffies, timeout))
+ break;
+
+ usleep_range(10, max_sleep);
+ if (max_sleep < 1024)
+ max_sleep *= 2;
+ } while (true);
+
+ pci_warn(dev, "VPD access failed. This is likely a firmware bug on this device. Contact the card vendor for a firmware update\n");
+ return -ETIMEDOUT;
+}
+
+static ssize_t pci_vpd_read(struct pci_dev *dev, loff_t pos, size_t count,
+ void *arg)
+{
+ struct pci_vpd *vpd = dev->vpd;
+ int ret;
+ loff_t end = pos + count;
+ u8 *buf = arg;
+
+ if (pos < 0)
+ return -EINVAL;
+
+ if (!vpd->valid) {
+ vpd->valid = 1;
+ vpd->len = pci_vpd_size(dev, vpd->len);
+ }
+
+ if (vpd->len == 0)
+ return -EIO;
+
+ if (pos > vpd->len)
+ return 0;
+
+ if (end > vpd->len) {
+ end = vpd->len;
+ count = end - pos;
+ }
+
+ if (mutex_lock_killable(&vpd->lock))
+ return -EINTR;
+
+ ret = pci_vpd_wait(dev);
+ if (ret < 0)
+ goto out;
+
+ while (pos < end) {
+ u32 val;
+ unsigned int i, skip;
+
+ ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
+ pos & ~3);
+ if (ret < 0)
+ break;
+ vpd->busy = 1;
+ vpd->flag = PCI_VPD_ADDR_F;
+ ret = pci_vpd_wait(dev);
+ if (ret < 0)
+ break;
+
+ ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA, &val);
+ if (ret < 0)
+ break;
+
+ skip = pos & 3;
+ for (i = 0; i < sizeof(u32); i++) {
+ if (i >= skip) {
+ *buf++ = val;
+ if (++pos == end)
+ break;
+ }
+ val >>= 8;
+ }
+ }
+out:
+ mutex_unlock(&vpd->lock);
+ return ret ? ret : count;
+}
+
+static ssize_t pci_vpd_write(struct pci_dev *dev, loff_t pos, size_t count,
+ const void *arg)
+{
+ struct pci_vpd *vpd = dev->vpd;
+ const u8 *buf = arg;
+ loff_t end = pos + count;
+ int ret = 0;
+
+ if (pos < 0 || (pos & 3) || (count & 3))
+ return -EINVAL;
+
+ if (!vpd->valid) {
+ vpd->valid = 1;
+ vpd->len = pci_vpd_size(dev, vpd->len);
+ }
+
+ if (vpd->len == 0)
+ return -EIO;
+
+ if (end > vpd->len)
+ return -EINVAL;
+
+ if (mutex_lock_killable(&vpd->lock))
+ return -EINTR;
+
+ ret = pci_vpd_wait(dev);
+ if (ret < 0)
+ goto out;
+
+ while (pos < end) {
+ u32 val;
+
+ val = *buf++;
+ val |= *buf++ << 8;
+ val |= *buf++ << 16;
+ val |= *buf++ << 24;
+
+ ret = pci_user_write_config_dword(dev, vpd->cap + PCI_VPD_DATA, val);
+ if (ret < 0)
+ break;
+ ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
+ pos | PCI_VPD_ADDR_F);
+ if (ret < 0)
+ break;
+
+ vpd->busy = 1;
+ vpd->flag = 0;
+ ret = pci_vpd_wait(dev);
+ if (ret < 0)
+ break;
+
+ pos += sizeof(u32);
+ }
+out:
+ mutex_unlock(&vpd->lock);
+ return ret ? ret : count;
+}
+
+static int pci_vpd_set_size(struct pci_dev *dev, size_t len)
+{
+ struct pci_vpd *vpd = dev->vpd;
+
+ if (len == 0 || len > PCI_VPD_MAX_SIZE)
+ return -EIO;
+
+ vpd->valid = 1;
+ vpd->len = len;
+
+ return 0;
+}
+
+static const struct pci_vpd_ops pci_vpd_ops = {
+ .read = pci_vpd_read,
+ .write = pci_vpd_write,
+ .set_size = pci_vpd_set_size,
+};
+
+static ssize_t pci_vpd_f0_read(struct pci_dev *dev, loff_t pos, size_t count,
+ void *arg)
+{
+ struct pci_dev *tdev = pci_get_slot(dev->bus,
+ PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
+ ssize_t ret;
+
+ if (!tdev)
+ return -ENODEV;
+
+ ret = pci_read_vpd(tdev, pos, count, arg);
+ pci_dev_put(tdev);
+ return ret;
+}
+
+static ssize_t pci_vpd_f0_write(struct pci_dev *dev, loff_t pos, size_t count,
+ const void *arg)
+{
+ struct pci_dev *tdev = pci_get_slot(dev->bus,
+ PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
+ ssize_t ret;
+
+ if (!tdev)
+ return -ENODEV;
+
+ ret = pci_write_vpd(tdev, pos, count, arg);
+ pci_dev_put(tdev);
+ return ret;
+}
+
+static int pci_vpd_f0_set_size(struct pci_dev *dev, size_t len)
+{
+ struct pci_dev *tdev = pci_get_slot(dev->bus,
+ PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
+ int ret;
+
+ if (!tdev)
+ return -ENODEV;
+
+ ret = pci_set_vpd_size(tdev, len);
+ pci_dev_put(tdev);
+ return ret;
+}
+
+static const struct pci_vpd_ops pci_vpd_f0_ops = {
+ .read = pci_vpd_f0_read,
+ .write = pci_vpd_f0_write,
+ .set_size = pci_vpd_f0_set_size,
+};
+
+int pci_vpd_init(struct pci_dev *dev)
+{
+ struct pci_vpd *vpd;
+ u8 cap;
+
+ cap = pci_find_capability(dev, PCI_CAP_ID_VPD);
+ if (!cap)
+ return -ENODEV;
+
+ vpd = kzalloc(sizeof(*vpd), GFP_ATOMIC);
+ if (!vpd)
+ return -ENOMEM;
+
+ vpd->len = PCI_VPD_MAX_SIZE;
+ if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0)
+ vpd->ops = &pci_vpd_f0_ops;
+ else
+ vpd->ops = &pci_vpd_ops;
+ mutex_init(&vpd->lock);
+ vpd->cap = cap;
+ vpd->busy = 0;
+ vpd->valid = 0;
+ dev->vpd = vpd;
+ return 0;
+}
+
+void pci_vpd_release(struct pci_dev *dev)
+{
+ kfree(dev->vpd);
+}
+
+static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *buf,
+ loff_t off, size_t count)
+{
+ struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
+
+ if (bin_attr->size > 0) {
+ if (off > bin_attr->size)
+ count = 0;
+ else if (count > bin_attr->size - off)
+ count = bin_attr->size - off;
+ }
+
+ return pci_read_vpd(dev, off, count, buf);
+}
+
+static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *buf,
+ loff_t off, size_t count)
+{
+ struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
+
+ if (bin_attr->size > 0) {
+ if (off > bin_attr->size)
+ count = 0;
+ else if (count > bin_attr->size - off)
+ count = bin_attr->size - off;
+ }
+
+ return pci_write_vpd(dev, off, count, buf);
+}
+
+void pcie_vpd_create_sysfs_dev_files(struct pci_dev *dev)
+{
+ int retval;
+ struct bin_attribute *attr;
+
+ if (!dev->vpd)
+ return;
+
+ attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
+ if (!attr)
+ return;
+
+ sysfs_bin_attr_init(attr);
+ attr->size = 0;
+ attr->attr.name = "vpd";
+ attr->attr.mode = S_IRUSR | S_IWUSR;
+ attr->read = read_vpd_attr;
+ attr->write = write_vpd_attr;
+ retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
+ if (retval) {
+ kfree(attr);
+ return;
+ }
+
+ dev->vpd->attr = attr;
+}
+
+void pcie_vpd_remove_sysfs_dev_files(struct pci_dev *dev)
+{
+ if (dev->vpd && dev->vpd->attr) {
+ sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
+ kfree(dev->vpd->attr);
+ }
+}
+
+int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt)
+{
+ int i;
+
+ for (i = off; i < len; ) {
+ u8 val = buf[i];
+
+ if (val & PCI_VPD_LRDT) {
+ /* Don't return success of the tag isn't complete */
+ if (i + PCI_VPD_LRDT_TAG_SIZE > len)
+ break;
+
+ if (val == rdt)
+ return i;
+
+ i += PCI_VPD_LRDT_TAG_SIZE +
+ pci_vpd_lrdt_size(&buf[i]);
+ } else {
+ u8 tag = val & ~PCI_VPD_SRDT_LEN_MASK;
+
+ if (tag == rdt)
+ return i;
+
+ if (tag == PCI_VPD_SRDT_END)
+ break;
+
+ i += PCI_VPD_SRDT_TAG_SIZE +
+ pci_vpd_srdt_size(&buf[i]);
+ }
+ }
+
+ return -ENOENT;
+}
+EXPORT_SYMBOL_GPL(pci_vpd_find_tag);
+
+int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off,
+ unsigned int len, const char *kw)
+{
+ int i;
+
+ for (i = off; i + PCI_VPD_INFO_FLD_HDR_SIZE <= off + len;) {
+ if (buf[i + 0] == kw[0] &&
+ buf[i + 1] == kw[1])
+ return i;
+
+ i += PCI_VPD_INFO_FLD_HDR_SIZE +
+ pci_vpd_info_field_size(&buf[i]);
+ }
+
+ return -ENOENT;
+}
+EXPORT_SYMBOL_GPL(pci_vpd_find_info_keyword);
+
+#ifdef CONFIG_PCI_QUIRKS
+/*
+ * Quirk non-zero PCI functions to route VPD access through function 0 for
+ * devices that share VPD resources between functions. The functions are
+ * expected to be identical devices.
+ */
+static void quirk_f0_vpd_link(struct pci_dev *dev)
+{
+ struct pci_dev *f0;
+
+ if (!PCI_FUNC(dev->devfn))
+ return;
+
+ f0 = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
+ if (!f0)
+ return;
+
+ if (f0->vpd && dev->class == f0->class &&
+ dev->vendor == f0->vendor && dev->device == f0->device)
+ dev->dev_flags |= PCI_DEV_FLAGS_VPD_REF_F0;
+
+ pci_dev_put(f0);
+}
+DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_INTEL, PCI_ANY_ID,
+ PCI_CLASS_NETWORK_ETHERNET, 8, quirk_f0_vpd_link);
+
+/*
+ * If a device follows the VPD format spec, the PCI core will not read or
+ * write past the VPD End Tag. But some vendors do not follow the VPD
+ * format spec, so we can't tell how much data is safe to access. Devices
+ * may behave unpredictably if we access too much. Blacklist these devices
+ * so we don't touch VPD at all.
+ */
+static void quirk_blacklist_vpd(struct pci_dev *dev)
+{
+ if (dev->vpd) {
+ dev->vpd->len = 0;
+ pci_warn(dev, FW_BUG "disabling VPD access (can't determine size of non-standard VPD format)\n");
+ }
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0060, quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x007c, quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0413, quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0078, quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0079, quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0073, quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0071, quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005b, quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x002f, quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005d, quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005f, quirk_blacklist_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATTANSIC, PCI_ANY_ID,
+ quirk_blacklist_vpd);
+/*
+ * The Amazon Annapurna Labs 0x0031 device id is reused for other non Root Port
+ * device types, so the quirk is registered for the PCI_CLASS_BRIDGE_PCI class.
+ */
+DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031,
+ PCI_CLASS_BRIDGE_PCI, 8, quirk_blacklist_vpd);
+
+/*
+ * For Broadcom 5706, 5708, 5709 rev. A nics, any read beyond the
+ * VPD end tag will hang the device. This problem was initially
+ * observed when a vpd entry was created in sysfs
+ * ('/sys/bus/pci/devices/<id>/vpd'). A read to this sysfs entry
+ * will dump 32k of data. Reading a full 32k will cause an access
+ * beyond the VPD end tag causing the device to hang. Once the device
+ * is hung, the bnx2 driver will not be able to reset the device.
+ * We believe that it is legal to read beyond the end tag and
+ * therefore the solution is to limit the read/write length.
+ */
+static void quirk_brcm_570x_limit_vpd(struct pci_dev *dev)
+{
+ /*
+ * Only disable the VPD capability for 5706, 5706S, 5708,
+ * 5708S and 5709 rev. A
+ */
+ if ((dev->device == PCI_DEVICE_ID_NX2_5706) ||
+ (dev->device == PCI_DEVICE_ID_NX2_5706S) ||
+ (dev->device == PCI_DEVICE_ID_NX2_5708) ||
+ (dev->device == PCI_DEVICE_ID_NX2_5708S) ||
+ ((dev->device == PCI_DEVICE_ID_NX2_5709) &&
+ (dev->revision & 0xf0) == 0x0)) {
+ if (dev->vpd)
+ dev->vpd->len = 0x80;
+ }
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
+ PCI_DEVICE_ID_NX2_5706,
+ quirk_brcm_570x_limit_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
+ PCI_DEVICE_ID_NX2_5706S,
+ quirk_brcm_570x_limit_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
+ PCI_DEVICE_ID_NX2_5708,
+ quirk_brcm_570x_limit_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
+ PCI_DEVICE_ID_NX2_5708S,
+ quirk_brcm_570x_limit_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
+ PCI_DEVICE_ID_NX2_5709,
+ quirk_brcm_570x_limit_vpd);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
+ PCI_DEVICE_ID_NX2_5709S,
+ quirk_brcm_570x_limit_vpd);
+
+static void quirk_chelsio_extend_vpd(struct pci_dev *dev)
+{
+ int chip = (dev->device & 0xf000) >> 12;
+ int func = (dev->device & 0x0f00) >> 8;
+ int prod = (dev->device & 0x00ff) >> 0;
+
+ /*
+ * If this is a T3-based adapter, there's a 1KB VPD area at offset
+ * 0xc00 which contains the preferred VPD values. If this is a T4 or
+ * later based adapter, the special VPD is at offset 0x400 for the
+ * Physical Functions (the SR-IOV Virtual Functions have no VPD
+ * Capabilities). The PCI VPD Access core routines will normally
+ * compute the size of the VPD by parsing the VPD Data Structure at
+ * offset 0x000. This will result in silent failures when attempting
+ * to accesses these other VPD areas which are beyond those computed
+ * limits.
+ */
+ if (chip == 0x0 && prod >= 0x20)
+ pci_set_vpd_size(dev, 8192);
+ else if (chip >= 0x4 && func < 0x8)
+ pci_set_vpd_size(dev, 2048);
+}
+
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_CHELSIO, PCI_ANY_ID,
+ quirk_chelsio_extend_vpd);
+
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-07 11:29:06 +0000