diff options
Diffstat (limited to 'SOURCES/0001-iommu-arm-smmu-workaround-DMA-mode-issues.patch')
| -rw-r--r-- | SOURCES/0001-iommu-arm-smmu-workaround-DMA-mode-issues.patch | 98 |
1 files changed, 0 insertions, 98 deletions
diff --git a/SOURCES/0001-iommu-arm-smmu-workaround-DMA-mode-issues.patch b/SOURCES/0001-iommu-arm-smmu-workaround-DMA-mode-issues.patch deleted file mode 100644 index 743be19..0000000 --- a/SOURCES/0001-iommu-arm-smmu-workaround-DMA-mode-issues.patch +++ /dev/null @@ -1,98 +0,0 @@ -From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 -From: Laura Abbott <labbott@redhat.com> -Date: Mon, 20 May 2019 22:21:02 -0400 -Subject: [PATCH] iommu/arm-smmu: workaround DMA mode issues - -Message-id: <20190520222102.19488-1-labbott@redhat.com> -Patchwork-id: 259215 -O-Subject: [ARK INTERNAL PATCH] iommu/arm-smmu: workaround DMA mode issues -Bugzilla: -RH-Acked-by: Mark Langsdorf <mlangsdo@redhat.com> -RH-Acked-by: Mark Salter <msalter@redhat.com> - -From: Mark Salter <msalter@redhat.com> - -Rebased for v5.2-rc1 - - Bugzilla: 1652259 - Brew: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=19244562 - Upstream status: RHEL only. - - rhel8 commit 65feb1ed0ec9a088a63a90d46c0f7563ac96ad0f - Author: Mark Salter <msalter@redhat.com> - Date: Wed Nov 21 17:15:59 2018 +0100 - - [iommu] iommu/arm-smmu: workaround DMA mode issues - - Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1624077 - Brew: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=18112820 - Testing: Verified iommu.passthrough=1 no longer needed on gigabyte platforms. - Upstream Status: RHEL-only - - In RHEL_ALT 7.5 we carried a RHEL-only patch which forced the arm smmuv2 - into bypass mode due to performance issues on CN88xx. This was intended - to be a temporary hack until the issues were resolved. Another vendor - had issues with the iommu in bypass mode so we reverted the RHEL-only - patch so that iommu is in DMA mode by default (upstream default). - - It turns on that there are remaining SMMU DMA mode issues on Gigabyte - platformws with CN88xx cpus. The problem manifests itself by pcie - card drivers failing to initialize the cards when SMMU is in DMA mode. - The root cause has not been determined yet, but looks likely to be - a hw or firmware issue. This patch forces bypass mode for Gigabyte - platforms. CN88xx isn't officially supported in RHEL but we have a - lot of them being used internally for testing, so I think we want - this to support that use case in RHEL8. - - Signed-off-by: Mark Salter <msalter@redhat.com> - Signed-off-by: Herton R. Krzesinski <herton@redhat.com> - - Acked-by: Mark Salter <msalter@redhat.com> - Acked-by: Donald Dutile <ddutile@redhat.com> - -Upstream Status: RHEL only -Signed-off-by: Laura Abbott <labbott@redhat.com> ---- - drivers/iommu/iommu.c | 22 ++++++++++++++++++++++ - 1 file changed, 22 insertions(+) - -diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c -index 609bd25bf154..c701912b13ab 100644 ---- a/drivers/iommu/iommu.c -+++ b/drivers/iommu/iommu.c -@@ -7,6 +7,7 @@ - #define pr_fmt(fmt) "iommu: " fmt - - #include <linux/device.h> -+#include <linux/dmi.h> - #include <linux/kernel.h> - #include <linux/bug.h> - #include <linux/types.h> -@@ -2849,3 +2850,24 @@ int iommu_sva_get_pasid(struct iommu_sva *handle) - return ops->sva_get_pasid(handle); - } - EXPORT_SYMBOL_GPL(iommu_sva_get_pasid); -+ -+#ifdef CONFIG_ARM64 -+static int __init iommu_quirks(void) -+{ -+ const char *vendor, *name; -+ -+ vendor = dmi_get_system_info(DMI_SYS_VENDOR); -+ name = dmi_get_system_info(DMI_PRODUCT_NAME); -+ -+ if (vendor && -+ (strncmp(vendor, "GIGABYTE", 8) == 0 && name && -+ (strncmp(name, "R120", 4) == 0 || -+ strncmp(name, "R270", 4) == 0))) { -+ pr_warn("Gigabyte %s detected, force iommu passthrough mode", name); -+ iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY; -+ } -+ -+ return 0; -+} -+arch_initcall(iommu_quirks); -+#endif --- -2.28.0 - |