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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 3/9] AMD/IOMMU: use bit field for IRTE
At the same time restrict its scope to just the single source file
actually using it, and abstract accesses by introducing a union of
pointers. (A union of the actual table entries is not used to make it
impossible to [wrongly, once the 128-bit form gets added] perform
pointer arithmetic / array accesses on derived types.)
Also move away from updating the entries piecemeal: Construct a full new
entry, and write it out.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
It would have been nice to use write_atomic() or ACCESS_ONCE() for the
actual writes, but both cast the value to a scalar one, which doesn't
suit us here (and I also didn't want to make the compound type a union
with a raw member just for this).
--- a/xen/drivers/passthrough/amd/iommu_intr.c
+++ b/xen/drivers/passthrough/amd/iommu_intr.c
@@ -23,6 +23,23 @@
#include <asm/io_apic.h>
#include <xen/keyhandler.h>
+struct irte_basic {
+ unsigned int remap_en:1;
+ unsigned int sup_io_pf:1;
+ unsigned int int_type:3;
+ unsigned int rq_eoi:1;
+ unsigned int dm:1;
+ unsigned int guest_mode:1; /* MBZ */
+ unsigned int dest:8;
+ unsigned int vector:8;
+ unsigned int :8;
+};
+
+union irte_ptr {
+ void *raw;
+ struct irte_basic *basic;
+};
+
#define INTREMAP_TABLE_ORDER 1
#define INTREMAP_LENGTH 0xB
#define INTREMAP_ENTRIES (1 << INTREMAP_LENGTH)
@@ -101,47 +118,44 @@ static unsigned int alloc_intremap_entry
return slot;
}
-static u32 *get_intremap_entry(int seg, int bdf, int offset)
+static union irte_ptr get_intremap_entry(unsigned int seg, unsigned int bdf,
+ unsigned int offset)
{
- u32 *table = get_ivrs_mappings(seg)[bdf].intremap_table;
+ union irte_ptr table = {
+ .raw = get_ivrs_mappings(seg)[bdf].intremap_table
+ };
+
+ ASSERT(table.raw && (offset < INTREMAP_ENTRIES));
- ASSERT( (table != NULL) && (offset < INTREMAP_ENTRIES) );
+ table.basic += offset;
- return table + offset;
+ return table;
}
-static void free_intremap_entry(int seg, int bdf, int offset)
+static void free_intremap_entry(unsigned int seg, unsigned int bdf, unsigned
int offset)
{
- u32 *entry = get_intremap_entry(seg, bdf, offset);
+ union irte_ptr entry = get_intremap_entry(seg, bdf, offset);
+
+ *entry.basic = (struct irte_basic){};
- memset(entry, 0, sizeof(u32));
__clear_bit(offset, get_ivrs_mappings(seg)[bdf].intremap_inuse);
}
-static void update_intremap_entry(u32* entry, u8 vector, u8 int_type,
- u8 dest_mode, u8 dest)
-{
- set_field_in_reg_u32(IOMMU_CONTROL_ENABLED, 0,
- INT_REMAP_ENTRY_REMAPEN_MASK,
- INT_REMAP_ENTRY_REMAPEN_SHIFT, entry);
- set_field_in_reg_u32(IOMMU_CONTROL_DISABLED, *entry,
- INT_REMAP_ENTRY_SUPIOPF_MASK,
- INT_REMAP_ENTRY_SUPIOPF_SHIFT, entry);
- set_field_in_reg_u32(int_type, *entry,
- INT_REMAP_ENTRY_INTTYPE_MASK,
- INT_REMAP_ENTRY_INTTYPE_SHIFT, entry);
- set_field_in_reg_u32(IOMMU_CONTROL_DISABLED, *entry,
- INT_REMAP_ENTRY_REQEOI_MASK,
- INT_REMAP_ENTRY_REQEOI_SHIFT, entry);
- set_field_in_reg_u32((u32)dest_mode, *entry,
- INT_REMAP_ENTRY_DM_MASK,
- INT_REMAP_ENTRY_DM_SHIFT, entry);
- set_field_in_reg_u32((u32)dest, *entry,
- INT_REMAP_ENTRY_DEST_MAST,
- INT_REMAP_ENTRY_DEST_SHIFT, entry);
- set_field_in_reg_u32((u32)vector, *entry,
- INT_REMAP_ENTRY_VECTOR_MASK,
- INT_REMAP_ENTRY_VECTOR_SHIFT, entry);
+static void update_intremap_entry(union irte_ptr entry, unsigned int vector,
+ unsigned int int_type,
+ unsigned int dest_mode, unsigned int dest)
+{
+ struct irte_basic basic = {
+ .remap_en = 1,
+ .sup_io_pf = 0,
+ .int_type = int_type,
+ .rq_eoi = 0,
+ .dm = dest_mode,
+ .dest = dest,
+ .vector = vector,
+ };
+
+ *entry.basic = basic;
}
static inline int get_rte_index(const struct IO_APIC_route_entry *rte)
@@ -163,7 +177,7 @@ static int update_intremap_entry_from_io
u16 *index)
{
unsigned long flags;
- u32* entry;
+ union irte_ptr entry;
u8 delivery_mode, dest, vector, dest_mode;
int req_id;
spinlock_t *lock;
@@ -201,12 +215,8 @@ static int update_intremap_entry_from_io
* so need to recover vector and delivery mode from IRTE.
*/
ASSERT(get_rte_index(rte) == offset);
- vector = get_field_from_reg_u32(*entry,
- INT_REMAP_ENTRY_VECTOR_MASK,
- INT_REMAP_ENTRY_VECTOR_SHIFT);
- delivery_mode = get_field_from_reg_u32(*entry,
- INT_REMAP_ENTRY_INTTYPE_MASK,
- INT_REMAP_ENTRY_INTTYPE_SHIFT);
+ vector = entry.basic->vector;
+ delivery_mode = entry.basic->int_type;
}
update_intremap_entry(entry, vector, delivery_mode, dest_mode, dest);
@@ -228,7 +238,7 @@ int __init amd_iommu_setup_ioapic_remapp
{
struct IO_APIC_route_entry rte;
unsigned long flags;
- u32* entry;
+ union irte_ptr entry;
int apic, pin;
u8 delivery_mode, dest, vector, dest_mode;
u16 seg, bdf, req_id;
@@ -407,16 +417,12 @@ unsigned int amd_iommu_read_ioapic_from_
u16 bdf = ioapic_sbdf[idx].bdf;
u16 seg = ioapic_sbdf[idx].seg;
u16 req_id = get_intremap_requestor_id(seg, bdf);
- const u32 *entry = get_intremap_entry(seg, req_id, offset);
+ union irte_ptr entry = get_intremap_entry(seg, req_id, offset);
ASSERT(offset == (val & (INTREMAP_ENTRIES - 1)));
val &= ~(INTREMAP_ENTRIES - 1);
- val |= get_field_from_reg_u32(*entry,
- INT_REMAP_ENTRY_INTTYPE_MASK,
- INT_REMAP_ENTRY_INTTYPE_SHIFT) << 8;
- val |= get_field_from_reg_u32(*entry,
- INT_REMAP_ENTRY_VECTOR_MASK,
- INT_REMAP_ENTRY_VECTOR_SHIFT);
+ val |= MASK_INSR(entry.basic->int_type, IO_APIC_REDIR_DELIV_MODE_MASK);
+ val |= MASK_INSR(entry.basic->vector, IO_APIC_REDIR_VECTOR_MASK);
}
return val;
@@ -427,7 +433,7 @@ static int update_intremap_entry_from_ms
int *remap_index, const struct msi_msg *msg, u32 *data)
{
unsigned long flags;
- u32* entry;
+ union irte_ptr entry;
u16 req_id, alias_id;
u8 delivery_mode, dest, vector, dest_mode;
spinlock_t *lock;
@@ -581,7 +587,7 @@ void amd_iommu_read_msi_from_ire(
const struct pci_dev *pdev = msi_desc->dev;
u16 bdf = pdev ? PCI_BDF2(pdev->bus, pdev->devfn) : hpet_sbdf.bdf;
u16 seg = pdev ? pdev->seg : hpet_sbdf.seg;
- const u32 *entry;
+ union irte_ptr entry;
if ( IS_ERR_OR_NULL(_find_iommu_for_device(seg, bdf)) )
return;
@@ -597,12 +603,8 @@ void amd_iommu_read_msi_from_ire(
}
msg->data &= ~(INTREMAP_ENTRIES - 1);
- msg->data |= get_field_from_reg_u32(*entry,
- INT_REMAP_ENTRY_INTTYPE_MASK,
- INT_REMAP_ENTRY_INTTYPE_SHIFT) << 8;
- msg->data |= get_field_from_reg_u32(*entry,
- INT_REMAP_ENTRY_VECTOR_MASK,
- INT_REMAP_ENTRY_VECTOR_SHIFT);
+ msg->data |= MASK_INSR(entry.basic->int_type, MSI_DATA_DELIVERY_MODE_MASK);
+ msg->data |= MASK_INSR(entry.basic->vector, MSI_DATA_VECTOR_MASK);
}
int __init amd_iommu_free_intremap_table(
--- a/xen/include/asm-x86/hvm/svm/amd-iommu-defs.h
+++ b/xen/include/asm-x86/hvm/svm/amd-iommu-defs.h
@@ -468,22 +468,6 @@ struct amd_iommu_pte {
#define IOMMU_CONTROL_DISABLED 0
#define IOMMU_CONTROL_ENABLED 1
-/* interrupt remapping table */
-#define INT_REMAP_ENTRY_REMAPEN_MASK 0x00000001
-#define INT_REMAP_ENTRY_REMAPEN_SHIFT 0
-#define INT_REMAP_ENTRY_SUPIOPF_MASK 0x00000002
-#define INT_REMAP_ENTRY_SUPIOPF_SHIFT 1
-#define INT_REMAP_ENTRY_INTTYPE_MASK 0x0000001C
-#define INT_REMAP_ENTRY_INTTYPE_SHIFT 2
-#define INT_REMAP_ENTRY_REQEOI_MASK 0x00000020
-#define INT_REMAP_ENTRY_REQEOI_SHIFT 5
-#define INT_REMAP_ENTRY_DM_MASK 0x00000040
-#define INT_REMAP_ENTRY_DM_SHIFT 6
-#define INT_REMAP_ENTRY_DEST_MAST 0x0000FF00
-#define INT_REMAP_ENTRY_DEST_SHIFT 8
-#define INT_REMAP_ENTRY_VECTOR_MASK 0x00FF0000
-#define INT_REMAP_ENTRY_VECTOR_SHIFT 16
-
#define INV_IOMMU_ALL_PAGES_ADDRESS ((1ULL << 63) - 1)
#define IOMMU_RING_BUFFER_PTR_MASK 0x0007FFF0
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