This is a note to let you know that I've just added the patch titled
iommu/amd: Handle GALog overflows
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iommu-amd-handle-galog-overflows.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 004ca64f9c6711b28a2bb4291db823e49028eda5
Author: Joao Martins <joao.m.martins@xxxxxxxxxx>
Date: Wed Apr 19 21:11:54 2023 +0100
iommu/amd: Handle GALog overflows
[ Upstream commit af47b0a24058e56e983881993752f88288ca6511 ]
GALog exists to propagate interrupts into all vCPUs in the system when
interrupts are marked as non running (e.g. when vCPUs aren't running). A
GALog overflow happens when there's in no space in the log to record the
GATag of the interrupt. So when the GALOverflow condition happens, the
GALog queue is processed and the GALog is restarted, as the IOMMU
manual indicates in section "2.7.4 Guest Virtual APIC Log Restart
Procedure":
| * Wait until MMIO Offset 2020h[GALogRun]=0b so that all request
| entries are completed as circumstances allow. GALogRun must be 0b to
| modify the guest virtual APIC log registers safely.
| * Write MMIO Offset 0018h[GALogEn]=0b.
| * As necessary, change the following values (e.g., to relocate or
| resize the guest virtual APIC event log):
| - the Guest Virtual APIC Log Base Address Register
| [MMIO Offset 00E0h],
| - the Guest Virtual APIC Log Head Pointer Register
| [MMIO Offset 2040h][GALogHead], and
| - the Guest Virtual APIC Log Tail Pointer Register
| [MMIO Offset 2048h][GALogTail].
| * Write MMIO Offset 2020h[GALOverflow] = 1b to clear the bit (W1C).
| * Write MMIO Offset 0018h[GALogEn] = 1b, and either set
| MMIO Offset 0018h[GAIntEn] to enable the GA log interrupt or clear
| the bit to disable it.
Failing to handle the GALog overflow means that none of the VFs (in any
guest) will work with IOMMU AVIC forcing the user to power cycle the
host. When handling the event it resumes the GALog without resizing
much like how it is done in the event handler overflow. The
[MMIO Offset 2020h][GALOverflow] bit might be set in status register
without the [MMIO Offset 2020h][GAInt] bit, so when deciding to poll
for GA events (to clear space in the galog), also check the overflow
bit.
[suravee: Check for GAOverflow without GAInt, toggle CONTROL_GAINT_EN]
Co-developed-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
Signed-off-by: Joao Martins <joao.m.martins@xxxxxxxxxx>
Reviewed-by: Vasant Hegde <vasant.hegde@xxxxxxx>
Link: https://lore.kernel.org/r/20230419201154.83880-3-joao.m.martins@xxxxxxxxxx
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Stable-dep-of: 8ec4e2befef1 ("iommu/amd: Fix up merge conflict resolution")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iommu/amd/amd_iommu.h b/drivers/iommu/amd/amd_iommu.h
index c160a332ce339..24c7e6c6c0de9 100644
--- a/drivers/iommu/amd/amd_iommu.h
+++ b/drivers/iommu/amd/amd_iommu.h
@@ -15,6 +15,7 @@ extern irqreturn_t amd_iommu_int_thread(int irq, void *data);
extern irqreturn_t amd_iommu_int_handler(int irq, void *data);
extern void amd_iommu_apply_erratum_63(struct amd_iommu *iommu, u16 devid);
extern void amd_iommu_restart_event_logging(struct amd_iommu *iommu);
+extern void amd_iommu_restart_ga_log(struct amd_iommu *iommu);
extern int amd_iommu_init_devices(void);
extern void amd_iommu_uninit_devices(void);
extern void amd_iommu_init_notifier(void);
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 7c14b1d32c8db..b0af8b5967e0d 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -751,6 +751,30 @@ void amd_iommu_restart_event_logging(struct amd_iommu *iommu)
iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN);
}
+/*
+ * This function restarts event logging in case the IOMMU experienced
+ * an GA log overflow.
+ */
+void amd_iommu_restart_ga_log(struct amd_iommu *iommu)
+{
+ u32 status;
+
+ status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
+ if (status & MMIO_STATUS_GALOG_RUN_MASK)
+ return;
+
+ pr_info_ratelimited("IOMMU GA Log restarting\n");
+
+ iommu_feature_disable(iommu, CONTROL_GALOG_EN);
+ iommu_feature_disable(iommu, CONTROL_GAINT_EN);
+
+ writel(MMIO_STATUS_GALOG_OVERFLOW_MASK,
+ iommu->mmio_base + MMIO_STATUS_OFFSET);
+
+ iommu_feature_enable(iommu, CONTROL_GAINT_EN);
+ iommu_feature_enable(iommu, CONTROL_GALOG_EN);
+}
+
/*
* This function resets the command buffer if the IOMMU stopped fetching
* commands from it.
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 0ccc6b8319fba..16c5d1b97b564 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -836,6 +836,7 @@ amd_iommu_set_pci_msi_domain(struct device *dev, struct amd_iommu *iommu) { }
(MMIO_STATUS_EVT_OVERFLOW_INT_MASK | \
MMIO_STATUS_EVT_INT_MASK | \
MMIO_STATUS_PPR_INT_MASK | \
+ MMIO_STATUS_GALOG_OVERFLOW_MASK | \
MMIO_STATUS_GALOG_INT_MASK)
irqreturn_t amd_iommu_int_thread(int irq, void *data)
@@ -859,10 +860,16 @@ irqreturn_t amd_iommu_int_thread(int irq, void *data)
}
#ifdef CONFIG_IRQ_REMAP
- if (status & MMIO_STATUS_GALOG_INT_MASK) {
+ if (status & (MMIO_STATUS_GALOG_INT_MASK |
+ MMIO_STATUS_GALOG_OVERFLOW_MASK)) {
pr_devel("Processing IOMMU GA Log\n");
iommu_poll_ga_log(iommu);
}
+
+ if (status & MMIO_STATUS_GALOG_OVERFLOW_MASK) {
+ pr_info_ratelimited("IOMMU GA Log overflow\n");
+ amd_iommu_restart_ga_log(iommu);
+ }
#endif
if (status & MMIO_STATUS_EVT_OVERFLOW_INT_MASK) {
