summaryrefslogtreecommitdiff
path: root/drivers/pci/quirks.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/pci/quirks.c')
-rw-r--r--drivers/pci/quirks.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index de5f610e0810..6a30252cd79f 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -4048,3 +4048,88 @@ void pci_dev_specific_enable_acs(struct pci_dev *dev)
}
}
}
+
+/*
+ * The PCI capabilities list for Intel DH895xCC VFs (device id 0x0443) with
+ * QuickAssist Technology (QAT) is prematurely terminated in hardware. The
+ * Next Capability pointer in the MSI Capability Structure should point to
+ * the PCIe Capability Structure but is incorrectly hardwired as 0 terminating
+ * the list.
+ */
+static void quirk_intel_qat_vf_cap(struct pci_dev *pdev)
+{
+ int pos, i = 0;
+ u8 next_cap;
+ u16 reg16, *cap;
+ struct pci_cap_saved_state *state;
+
+ /* Bail if the hardware bug is fixed */
+ if (pdev->pcie_cap || pci_find_capability(pdev, PCI_CAP_ID_EXP))
+ return;
+
+ /* Bail if MSI Capability Structure is not found for some reason */
+ pos = pci_find_capability(pdev, PCI_CAP_ID_MSI);
+ if (!pos)
+ return;
+
+ /*
+ * Bail if Next Capability pointer in the MSI Capability Structure
+ * is not the expected incorrect 0x00.
+ */
+ pci_read_config_byte(pdev, pos + 1, &next_cap);
+ if (next_cap)
+ return;
+
+ /*
+ * PCIe Capability Structure is expected to be at 0x50 and should
+ * terminate the list (Next Capability pointer is 0x00). Verify
+ * Capability Id and Next Capability pointer is as expected.
+ * Open-code some of set_pcie_port_type() and pci_cfg_space_size_ext()
+ * to correctly set kernel data structures which have already been
+ * set incorrectly due to the hardware bug.
+ */
+ pos = 0x50;
+ pci_read_config_word(pdev, pos, &reg16);
+ if (reg16 == (0x0000 | PCI_CAP_ID_EXP)) {
+ u32 status;
+#ifndef PCI_EXP_SAVE_REGS
+#define PCI_EXP_SAVE_REGS 7
+#endif
+ int size = PCI_EXP_SAVE_REGS * sizeof(u16);
+
+ pdev->pcie_cap = pos;
+ pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, &reg16);
+ pdev->pcie_flags_reg = reg16;
+ pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, &reg16);
+ pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
+
+ pdev->cfg_size = PCI_CFG_SPACE_EXP_SIZE;
+ if (pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &status) !=
+ PCIBIOS_SUCCESSFUL || (status == 0xffffffff))
+ pdev->cfg_size = PCI_CFG_SPACE_SIZE;
+
+ if (pci_find_saved_cap(pdev, PCI_CAP_ID_EXP))
+ return;
+
+ /*
+ * Save PCIE cap
+ */
+ state = kzalloc(sizeof(*state) + size, GFP_KERNEL);
+ if (!state)
+ return;
+
+ state->cap.cap_nr = PCI_CAP_ID_EXP;
+ state->cap.cap_extended = 0;
+ state->cap.size = size;
+ cap = (u16 *)&state->cap.data[0];
+ pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &cap[i++]);
+ pcie_capability_read_word(pdev, PCI_EXP_LNKCTL, &cap[i++]);
+ pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &cap[i++]);
+ pcie_capability_read_word(pdev, PCI_EXP_RTCTL, &cap[i++]);
+ pcie_capability_read_word(pdev, PCI_EXP_DEVCTL2, &cap[i++]);
+ pcie_capability_read_word(pdev, PCI_EXP_LNKCTL2, &cap[i++]);
+ pcie_capability_read_word(pdev, PCI_EXP_SLTCTL2, &cap[i++]);
+ hlist_add_head(&state->next, &pdev->saved_cap_space);
+ }
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x443, quirk_intel_qat_vf_cap);