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iommu/amd: Restore GA log/tail pointer on host resume

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[ Upstream commit a8d4a37d1bb93608501d0d0545f902061152669a ]

This will give IOMMU GA log a chance to work after resume
from s3/s4.

Fixes: 8bda0cfbdc ("iommu/amd: Detect and initialize guest vAPIC log")

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Link: https://lore.kernel.org/r/20211123161038.48009-2-mlevitsk@redhat.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maxim Levitsky 2021-11-23 18:10:34 +02:00 committed by Greg Kroah-Hartman
parent c2bd7c31de
commit 676049a3d2
1 changed files with 15 additions and 16 deletions
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31
drivers/iommu/amd/init.c
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@ -805,16 +805,27 @@ static int iommu_ga_log_enable(struct amd_iommu *iommu)
{
#ifdef CONFIG_IRQ_REMAP
u32 status, i;
u64 entry;
if (!iommu->ga_log)
return -EINVAL;
status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
/* Check if already running */
if (status & (MMIO_STATUS_GALOG_RUN_MASK))
status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
if (WARN_ON(status & (MMIO_STATUS_GALOG_RUN_MASK)))
return 0;
entry = iommu_virt_to_phys(iommu->ga_log) | GA_LOG_SIZE_512;
memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_BASE_OFFSET,
&entry, sizeof(entry));
entry = (iommu_virt_to_phys(iommu->ga_log_tail) &
(BIT_ULL(52)-1)) & ~7ULL;
memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_TAIL_OFFSET,
&entry, sizeof(entry));
writel(0x00, iommu->mmio_base + MMIO_GA_HEAD_OFFSET);
writel(0x00, iommu->mmio_base + MMIO_GA_TAIL_OFFSET);
iommu_feature_enable(iommu, CONTROL_GAINT_EN);
iommu_feature_enable(iommu, CONTROL_GALOG_EN);
@ -824,7 +835,7 @@ static int iommu_ga_log_enable(struct amd_iommu *iommu)
break;
}
if (i >= LOOP_TIMEOUT)
if (WARN_ON(i >= LOOP_TIMEOUT))
return -EINVAL;
#endif /* CONFIG_IRQ_REMAP */
return 0;
@ -833,8 +844,6 @@ static int iommu_ga_log_enable(struct amd_iommu *iommu)
static int iommu_init_ga_log(struct amd_iommu *iommu)
{
#ifdef CONFIG_IRQ_REMAP
u64 entry;
if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir))
return 0;
@ -848,16 +857,6 @@ static int iommu_init_ga_log(struct amd_iommu *iommu)
if (!iommu->ga_log_tail)
goto err_out;
entry = iommu_virt_to_phys(iommu->ga_log) | GA_LOG_SIZE_512;
memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_BASE_OFFSET,
&entry, sizeof(entry));
entry = (iommu_virt_to_phys(iommu->ga_log_tail) &
(BIT_ULL(52)-1)) & ~7ULL;
memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_TAIL_OFFSET,
&entry, sizeof(entry));
writel(0x00, iommu->mmio_base + MMIO_GA_HEAD_OFFSET);
writel(0x00, iommu->mmio_base + MMIO_GA_TAIL_OFFSET);
return 0;
err_out:
free_ga_log(iommu);