From: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Date: Wed, 6 Jul 2022 17:07:57 +0530
Subject: iommu/amd: Introduce per PCI segment old_dev_tbl_cpy
Git-commit: eb21ef0227915ba61c8927fddca53571a0a35de8
Patch-mainline: v6.0-rc1
References: bsc#1205701
It will remove global old_dev_tbl_cpy. Also update copy_device_table()
copy device table for all PCI segments.
Co-developed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20220706113825.25582-8-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/amd/amd_iommu_types.h | 6 ++
drivers/iommu/amd/init.c | 109 +++++++++++++++++++++---------------
2 files changed, 70 insertions(+), 45 deletions(-)
diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index 5f3cc704f131..3ef68d588cc7 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -574,6 +574,12 @@ struct amd_iommu_pci_seg {
* device id quickly.
*/
struct irq_remap_table **irq_lookup_table;
+
+ /*
+ * Pointer to a device table which the content of old device table
+ * will be copied to. It's only be used in kdump kernel.
+ */
+ struct dev_table_entry *old_dev_tbl_cpy;
};
/*
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 5455b9d051e9..a750707e725b 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -193,11 +193,6 @@ bool amd_iommu_force_isolation __read_mostly;
* page table root pointer.
*/
struct dev_table_entry *amd_iommu_dev_table;
-/*
- * Pointer to a device table which the content of old device table
- * will be copied to. It's only be used in kdump kernel.
- */
-static struct dev_table_entry *old_dev_tbl_cpy;
/*
* The alias table is a driver specific data structure which contains the
@@ -992,39 +987,27 @@ static int get_dev_entry_bit(u16 devid, u8 bit)
}
-static bool copy_device_table(void)
+static bool __copy_device_table(struct amd_iommu *iommu)
{
- u64 int_ctl, int_tab_len, entry = 0, last_entry = 0;
+ u64 int_ctl, int_tab_len, entry = 0;
+ struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;
struct dev_table_entry *old_devtb = NULL;
u32 lo, hi, devid, old_devtb_size;
phys_addr_t old_devtb_phys;
- struct amd_iommu *iommu;
u16 dom_id, dte_v, irq_v;
gfp_t gfp_flag;
u64 tmp;
- if (!amd_iommu_pre_enabled)
- return false;
-
- pr_warn("Translation is already enabled - trying to copy translation structures\n");
- for_each_iommu(iommu) {
- /* All IOMMUs should use the same device table with the same size */
- lo = readl(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET);
- hi = readl(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET + 4);
- entry = (((u64) hi) << 32) + lo;
- if (last_entry && last_entry != entry) {
- pr_err("IOMMU:%d should use the same dev table as others!\n",
- iommu->index);
- return false;
- }
- last_entry = entry;
+ /* Each IOMMU use separate device table with the same size */
+ lo = readl(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET);
+ hi = readl(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET + 4);
+ entry = (((u64) hi) << 32) + lo;
- old_devtb_size = ((entry & ~PAGE_MASK) + 1) << 12;
- if (old_devtb_size != dev_table_size) {
- pr_err("The device table size of IOMMU:%d is not expected!\n",
- iommu->index);
- return false;
- }
+ old_devtb_size = ((entry & ~PAGE_MASK) + 1) << 12;
+ if (old_devtb_size != dev_table_size) {
+ pr_err("The device table size of IOMMU:%d is not expected!\n",
+ iommu->index);
+ return false;
}
/*
@@ -1047,31 +1030,31 @@ static bool copy_device_table(void)
return false;
gfp_flag = GFP_KERNEL | __GFP_ZERO | GFP_DMA32;
- old_dev_tbl_cpy = (void *)__get_free_pages(gfp_flag,
- get_order(dev_table_size));
- if (old_dev_tbl_cpy == NULL) {
+ pci_seg->old_dev_tbl_cpy = (void *)__get_free_pages(gfp_flag,
+ get_order(dev_table_size));
+ if (pci_seg->old_dev_tbl_cpy == NULL) {
pr_err("Failed to allocate memory for copying old device table!\n");
memunmap(old_devtb);
return false;
}
for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {
- old_dev_tbl_cpy[devid] = old_devtb[devid];
+ pci_seg->old_dev_tbl_cpy[devid] = old_devtb[devid];
dom_id = old_devtb[devid].data[1] & DEV_DOMID_MASK;
dte_v = old_devtb[devid].data[0] & DTE_FLAG_V;
if (dte_v && dom_id) {
- old_dev_tbl_cpy[devid].data[0] = old_devtb[devid].data[0];
- old_dev_tbl_cpy[devid].data[1] = old_devtb[devid].data[1];
+ pci_seg->old_dev_tbl_cpy[devid].data[0] = old_devtb[devid].data[0];
+ pci_seg->old_dev_tbl_cpy[devid].data[1] = old_devtb[devid].data[1];
__set_bit(dom_id, amd_iommu_pd_alloc_bitmap);
/* If gcr3 table existed, mask it out */
if (old_devtb[devid].data[0] & DTE_FLAG_GV) {
tmp = DTE_GCR3_VAL_B(~0ULL) << DTE_GCR3_SHIFT_B;
tmp |= DTE_GCR3_VAL_C(~0ULL) << DTE_GCR3_SHIFT_C;
- old_dev_tbl_cpy[devid].data[1] &= ~tmp;
+ pci_seg->old_dev_tbl_cpy[devid].data[1] &= ~tmp;
tmp = DTE_GCR3_VAL_A(~0ULL) << DTE_GCR3_SHIFT_A;
tmp |= DTE_FLAG_GV;
- old_dev_tbl_cpy[devid].data[0] &= ~tmp;
+ pci_seg->old_dev_tbl_cpy[devid].data[0] &= ~tmp;
}
}
@@ -1086,7 +1069,7 @@ static bool copy_device_table(void)
return false;
}
- old_dev_tbl_cpy[devid].data[2] = old_devtb[devid].data[2];
+ pci_seg->old_dev_tbl_cpy[devid].data[2] = old_devtb[devid].data[2];
}
}
memunmap(old_devtb);
@@ -1094,6 +1077,33 @@ static bool copy_device_table(void)
return true;
}
+static bool copy_device_table(void)
+{
+ struct amd_iommu *iommu;
+ struct amd_iommu_pci_seg *pci_seg;
+
+ if (!amd_iommu_pre_enabled)
+ return false;
+
+ pr_warn("Translation is already enabled - trying to copy translation structures\n");
+
+ /*
+ * All IOMMUs within PCI segment shares common device table.
+ * Hence copy device table only once per PCI segment.
+ */
+ for_each_pci_segment(pci_seg) {
+ for_each_iommu(iommu) {
+ if (pci_seg->id != iommu->pci_seg->id)
+ continue;
+ if (!__copy_device_table(iommu))
+ return false;
+ break;
+ }
+ }
+
+ return true;
+}
+
void amd_iommu_apply_erratum_63(u16 devid)
{
int sysmgt;
@@ -2591,7 +2601,7 @@ static void early_enable_iommu(struct amd_iommu *iommu)
static void early_enable_iommus(void)
{
struct amd_iommu *iommu;
-
+ struct amd_iommu_pci_seg *pci_seg;
if (!copy_device_table()) {
/*
@@ -2601,9 +2611,14 @@ static void early_enable_iommus(void)
*/
if (amd_iommu_pre_enabled)
pr_err("Failed to copy DEV table from previous kernel.\n");
- if (old_dev_tbl_cpy != NULL)
- free_pages((unsigned long)old_dev_tbl_cpy,
- get_order(dev_table_size));
+
+ for_each_pci_segment(pci_seg) {
+ if (pci_seg->old_dev_tbl_cpy != NULL) {
+ free_pages((unsigned long)pci_seg->old_dev_tbl_cpy,
+ get_order(dev_table_size));
+ pci_seg->old_dev_tbl_cpy = NULL;
+ }
+ }
for_each_iommu(iommu) {
clear_translation_pre_enabled(iommu);
@@ -2611,9 +2626,13 @@ static void early_enable_iommus(void)
}
} else {
pr_info("Copied DEV table from previous kernel.\n");
- free_pages((unsigned long)amd_iommu_dev_table,
- get_order(dev_table_size));
- amd_iommu_dev_table = old_dev_tbl_cpy;
+
+ for_each_pci_segment(pci_seg) {
+ free_pages((unsigned long)pci_seg->dev_table,
+ get_order(dev_table_size));
+ pci_seg->dev_table = pci_seg->old_dev_tbl_cpy;
+ }
+
for_each_iommu(iommu) {
iommu_disable_command_buffer(iommu);
iommu_disable_event_buffer(iommu);