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-rw-r--r--0001-iommu-arm-smmu-workaround-DMA-mode-issues.patch98
1 files changed, 0 insertions, 98 deletions
diff --git a/0001-iommu-arm-smmu-workaround-DMA-mode-issues.patch b/0001-iommu-arm-smmu-workaround-DMA-mode-issues.patch
deleted file mode 100644
index e6eef22d6..000000000
--- a/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 03d6a26687bc..86981f228c90 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>
-@@ -2664,3 +2665,24 @@ 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
---
-2.26.2
-