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PCI: Store number of supported End-End TLP Prefixes

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eetlp_prefix_path in the struct pci_dev tells if End-End TLP Prefixes
are supported by the path or not, and the value is only calculated if
CONFIG_PCI_PASID is set.

The Max End-End TLP Prefixes field in the Device Capabilities Register 2
also tells how many (1-4) End-End TLP Prefixes are supported (PCIe r6.2 sec
7.5.3.15). The number of supported End-End Prefixes is useful for reading
correct number of DWORDs from TLP Prefix Log register in AER capability
(PCIe r6.2 sec 7.8.4.12).

Replace eetlp_prefix_path with eetlp_prefix_max and determine the number of
supported End-End Prefixes regardless of CONFIG_PCI_PASID so that an
upcoming commit generalizing TLP Prefix Log register reading does not have
to read extra DWORDs for End-End Prefixes that never will be there.

The value stored into eetlp_prefix_max is directly derived from device's
Max End-End TLP Prefixes and does not consider limitations imposed by
bridges or the Root Port beyond supported/not supported flags. This is
intentional for two reasons:

  1) PCIe r6.2 spec sections 2.2.10.4 & 6.2.4.4 indicate that a TLP is
     malformed only if the number of prefixes exceed the number of Max
     End-End TLP Prefixes, which seems to be the case even if the device
     could never receive that many prefixes due to smaller maximum imposed
     by a bridge or the Root Port. If TLP parsing is later added, this
     distinction is significant in interpreting what is logged by the TLP
     Prefix Log registers and the value matching to the Malformed TLP
     threshold is going to be more useful.

  2) TLP Prefix handling happens autonomously on a low layer and the value
     in eetlp_prefix_max is not programmed anywhere by the kernel (i.e.,
     there is no limiter OS can control to prevent sending more than N TLP
     Prefixes).

Link: https://lore.kernel.org/r/20250114170840.1633-7-ilpo.jarvinen@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
This commit is contained in:
Ilpo Järvinen
2025-01-14 19:08:38 +02:00
committed by Bjorn Helgaas
parent 27d41818b6
commit e5321ae10e
4 changed files with 12 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/pci/ats.c
+1 -1
View File
@@ -410,7 +410,7 @@ int pci_enable_pasid(struct pci_dev *pdev, int features)
if (WARN_ON(pdev->pasid_enabled))
return -EBUSY;
if (!pdev->eetlp_prefix_path && !pdev->pasid_no_tlp)
if (!pdev->eetlp_prefix_max && !pdev->pasid_no_tlp)
return -EINVAL;
if (!pasid)
drivers/pci/probe.c
+9 -5
View File
@@ -2251,8 +2251,8 @@ static void pci_configure_relaxed_ordering(struct pci_dev *dev)
static void pci_configure_eetlp_prefix(struct pci_dev *dev)
{
#ifdef CONFIG_PCI_PASID
struct pci_dev *bridge;
unsigned int eetlp_max;
int pcie_type;
u32 cap;
@@ -2264,15 +2264,19 @@ static void pci_configure_eetlp_prefix(struct pci_dev *dev)
return;
pcie_type = pci_pcie_type(dev);
eetlp_max = FIELD_GET(PCI_EXP_DEVCAP2_EE_PREFIX_MAX, cap);
/* 00b means 4 */
eetlp_max = eetlp_max ?: 4;
if (pcie_type == PCI_EXP_TYPE_ROOT_PORT ||
pcie_type == PCI_EXP_TYPE_RC_END)
dev->eetlp_prefix_path = 1;
dev->eetlp_prefix_max = eetlp_max;
else {
bridge = pci_upstream_bridge(dev);
if (bridge && bridge->eetlp_prefix_path)
dev->eetlp_prefix_path = 1;
if (bridge && bridge->eetlp_prefix_max)
dev->eetlp_prefix_max = eetlp_max;
}
#endif
}
static void pci_configure_serr(struct pci_dev *dev)
include/linux/pci.h
+1 -1
View File
@@ -407,7 +407,7 @@ struct pci_dev {
supported from root to here */
#endif
unsigned int pasid_no_tlp:1; /* PASID works without TLP Prefix */
unsigned int eetlp_prefix_path:1; /* End-to-End TLP Prefix */
unsigned int eetlp_prefix_max:3; /* Max # of End-End TLP Prefixes, 0=not supported */
pci_channel_state_t error_state; /* Current connectivity state */
struct device dev; /* Generic device interface */
include/uapi/linux/pci_regs.h
+1
View File
@@ -665,6 +665,7 @@
#define PCI_EXP_DEVCAP2_OBFF_MSG 0x00040000 /* New message signaling */
#define PCI_EXP_DEVCAP2_OBFF_WAKE 0x00080000 /* Re-use WAKE# for OBFF */
#define PCI_EXP_DEVCAP2_EE_PREFIX 0x00200000 /* End-End TLP Prefix */
#define PCI_EXP_DEVCAP2_EE_PREFIX_MAX 0x00c00000 /* Max End-End TLP Prefixes */
#define PCI_EXP_DEVCTL2 0x28 /* Device Control 2 */
#define PCI_EXP_DEVCTL2_COMP_TIMEOUT 0x000f /* Completion Timeout Value */
#define PCI_EXP_DEVCTL2_COMP_TMOUT_DIS 0x0010 /* Completion Timeout Disable */