IOMMU fixes for Linux v3.8-rc5
One fix for the AMD IOMMU driver to work around broken BIOSes found in the field. Some BIOSes forget to enable a workaround for a hardware problem which might cause the IOMMU to stop working under high load conditions. The fix makes sure this workaround is enabled. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJRBpTXAAoJECvwRC2XARrjGDUQAKsNxpN2iD0BEvVUqCzTR7ha BTwxwKnMwxBr0vZZZzCCT9JnNXcPKKfJYLEWqW5QE7m/qlvYiBxS8Cg8uAfGVw0n y/y/SQPww7jeImyOCvAN9Axl+SZ8sHmKJTmS4343+CqpQ1e6PilC4WV5ogmOz/Gy nc9bj9rJGIMEP76bCYY7rMz7xVOaHmIOE+XcEA8TTj37AOk8t9PTUqLno+APTqWd X3jhgjRTQuisCiy+sTiGllXoa+CdH7+gmDOvd4S8CRzrhIznPDNI+x7UNfq8n5A0 KBqwUEzeQ5fyqqopJQaSaK8+6eTZ8dUxcfpqjyD/sxe7dLY0V+1KBNcNZrOolz/w juLbV+dTfSJcaJHjjvh1NEqvN4ky/6zuNF50KexaL0DSqpUkPf62heXd+P60l5DE Tj+h3d8xX/mI1Ap2q14/4Bggvpdz3I+GPWnmyISOI7ZklxB0DlYeQiY+ZYDdO5Bl 4aNvCRRRPEG6TsZzkJR60+iSjUnGEN7PSdrDkFymvmG0U0hH73xcy5Xc4Z3mRffx HNyK4uAnUNIgPzdZA2K9uctGLOj14Z1n/iREc2FhrGhPeyoaMhXMyWPbTVCQ0Fdx 7cV6sBzuh/RzFD/S8r+VHP4umRg8uf2+22FaAVOaOD1wtO5ug9WAZQ+nqwcOTHNc YVO8wlC8XyybzM2+Xb7E =X83i -----END PGP SIGNATURE----- Merge tag 'iommu-fixes-v3.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu Pull IOMMU fix from Joerg Roedel: "One fix for the AMD IOMMU driver to work around broken BIOSes found in the field. Some BIOSes forget to enable a workaround for a hardware problem which might cause the IOMMU to stop working under high load conditions. The fix makes sure this workaround is enabled." * tag 'iommu-fixes-v3.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: IOMMU, AMD Family15h Model10-1Fh erratum 746 Workaround
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@ -974,6 +974,38 @@ static void __init free_iommu_all(void)
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}
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}
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/*
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* Family15h Model 10h-1fh erratum 746 (IOMMU Logging May Stall Translations)
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* Workaround:
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* BIOS should disable L2B micellaneous clock gating by setting
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* L2_L2B_CK_GATE_CONTROL[CKGateL2BMiscDisable](D0F2xF4_x90[2]) = 1b
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*/
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static void __init amd_iommu_erratum_746_workaround(struct amd_iommu *iommu)
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{
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u32 value;
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if ((boot_cpu_data.x86 != 0x15) ||
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(boot_cpu_data.x86_model < 0x10) ||
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(boot_cpu_data.x86_model > 0x1f))
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return;
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pci_write_config_dword(iommu->dev, 0xf0, 0x90);
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pci_read_config_dword(iommu->dev, 0xf4, &value);
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if (value & BIT(2))
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return;
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/* Select NB indirect register 0x90 and enable writing */
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pci_write_config_dword(iommu->dev, 0xf0, 0x90 | (1 << 8));
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pci_write_config_dword(iommu->dev, 0xf4, value | 0x4);
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pr_info("AMD-Vi: Applying erratum 746 workaround for IOMMU at %s\n",
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dev_name(&iommu->dev->dev));
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/* Clear the enable writing bit */
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pci_write_config_dword(iommu->dev, 0xf0, 0x90);
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}
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/*
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* This function clues the initialization function for one IOMMU
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* together and also allocates the command buffer and programs the
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@ -1172,6 +1204,8 @@ static int iommu_init_pci(struct amd_iommu *iommu)
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iommu->stored_l2[i] = iommu_read_l2(iommu, i);
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}
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amd_iommu_erratum_746_workaround(iommu);
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return pci_enable_device(iommu->dev);
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}
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