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iommu/amd: Fix loop timeout issue in iommu_ga_log_enable()

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commit 9b45a7738e upstream.

The polling loop for the register change in iommu_ga_log_enable() needs
to have a udelay() in it.  Otherwise the CPU might be faster than the
IOMMU hardware and wrongly trigger the WARN_ON() further down the code
stream. Use a 10us for udelay(), has there is some hardware where
activation of the GA log can take more than a 100ms.

A future optimization should move the activation check of the GA log
to the point where it gets used for the first time. But that is a
bigger change and not suitable for a fix.

Fixes: 8bda0cfbdc ("iommu/amd: Detect and initialize guest vAPIC log")
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20220204115537.3894-1-joro@8bytes.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joerg Roedel 2022-02-04 12:55:37 +01:00 committed by Greg Kroah-Hartman
parent 9d9995b037
commit 6d226e8afe
1 changed files with 2 additions and 0 deletions
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2
drivers/iommu/amd/init.c
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@ -20,6 +20,7 @@
#include <linux/export.h> #include <linux/export.h>
#include <linux/kmemleak.h> #include <linux/kmemleak.h>
#include <linux/mem_encrypt.h> #include <linux/mem_encrypt.h>
#include <linux/iopoll.h>
#include <asm/pci-direct.h> #include <asm/pci-direct.h>
#include <asm/iommu.h> #include <asm/iommu.h>
#include <asm/apic.h> #include <asm/apic.h>
@ -833,6 +834,7 @@ static int iommu_ga_log_enable(struct amd_iommu *iommu)
status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET); status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
if (status & (MMIO_STATUS_GALOG_RUN_MASK)) if (status & (MMIO_STATUS_GALOG_RUN_MASK))
break; break;
udelay(10);
} }
if (WARN_ON(i >= LOOP_TIMEOUT)) if (WARN_ON(i >= LOOP_TIMEOUT))