drivers/accel/habanalabs/common/pci/pci.c

Source file repositories/reference/linux-study-clean/drivers/accel/habanalabs/common/pci/pci.c

File Facts

System
Linux kernel
Corpus path
drivers/accel/habanalabs/common/pci/pci.c
Extension
.c
Size
11321 bytes
Lines
440
Domain
Driver Families
Bucket
drivers/accel
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (!hdev->pcie_bar[bar]) {
			dev_err(hdev->dev, "pci_ioremap%s_bar failed for %s\n",
					is_wc[i] ? "_wc" : "", name[i]);
			rc = -ENODEV;
			goto err;
		}
	}

	return 0;

err:
	for (i = 2 ; i >= 0 ; i--) {
		bar = i * 2; /* 64-bit BARs */
		if (hdev->pcie_bar[bar])
			iounmap(hdev->pcie_bar[bar]);
	}

	pci_release_regions(pdev);

	return rc;
}

/**
 * hl_pci_bars_unmap() - Unmap PCI BARS.
 * @hdev: Pointer to hl_device structure.
 *
 * Release all PCI BARs and unmap their virtual addresses.
 */
static void hl_pci_bars_unmap(struct hl_device *hdev)
{
	struct pci_dev *pdev = hdev->pdev;
	int i, bar;

	for (i = 2 ; i >= 0 ; i--) {
		bar = i * 2; /* 64-bit BARs */
		iounmap(hdev->pcie_bar[bar]);
	}

	pci_release_regions(pdev);
}

int hl_pci_elbi_read(struct hl_device *hdev, u64 addr, u32 *data)
{
	struct pci_dev *pdev = hdev->pdev;
	ktime_t timeout;
	u64 msec;
	u32 val;

	if (hdev->pldm)
		msec = HL_PLDM_PCI_ELBI_TIMEOUT_MSEC;
	else
		msec = HL_PCI_ELBI_TIMEOUT_MSEC;

	/* Clear previous status */
	pci_write_config_dword(pdev, mmPCI_CONFIG_ELBI_STS, 0);

	pci_write_config_dword(pdev, mmPCI_CONFIG_ELBI_ADDR, (u32) addr);
	pci_write_config_dword(pdev, mmPCI_CONFIG_ELBI_CTRL, 0);

	timeout = ktime_add_ms(ktime_get(), msec);
	for (;;) {
		pci_read_config_dword(pdev, mmPCI_CONFIG_ELBI_STS, &val);
		if (val & PCI_CONFIG_ELBI_STS_MASK)
			break;
		if (ktime_compare(ktime_get(), timeout) > 0) {
			pci_read_config_dword(pdev, mmPCI_CONFIG_ELBI_STS,
						&val);
			break;
		}

		usleep_range(300, 500);
	}

	if ((val & PCI_CONFIG_ELBI_STS_MASK) == PCI_CONFIG_ELBI_STS_DONE) {
		pci_read_config_dword(pdev, mmPCI_CONFIG_ELBI_DATA, data);

		if (unlikely(trace_habanalabs_elbi_read_enabled()))
			trace_habanalabs_elbi_read(&hdev->pdev->dev, (u32) addr, val);

		return 0;
	}

	if (val & PCI_CONFIG_ELBI_STS_ERR) {
		dev_err(hdev->dev, "Error reading from ELBI\n");
		return -EIO;
	}

	if (!(val & PCI_CONFIG_ELBI_STS_MASK)) {
		dev_err(hdev->dev, "ELBI read didn't finish in time\n");
		return -EIO;

Annotation

Implementation Notes