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drm/i915/gvt: Add software PTE flag to mark special 64K splited entry

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This add a software PTE flag on the Ignored bit of PTE. It will be used
to identify splited 64K shadow entries.

v2: fix mask definition.

Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Changbin Du 2018-05-15 10:35:37 +08:00 committed by Zhenyu Wang
parent 40b271767d
commit 7163484856
2 changed files with 24 additions and 0 deletions
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21
drivers/gpu/drm/i915/gvt/gtt.c
View file

@ -348,6 +348,9 @@ static inline int gtt_set_entry64(void *pt,
#define ADDR_64K_MASK GENMASK_ULL(GTT_HAW - 1, 16)
#define ADDR_4K_MASK GENMASK_ULL(GTT_HAW - 1, 12)
#define GTT_SPTE_FLAG_MASK GENMASK_ULL(62, 52)
#define GTT_SPTE_FLAG_64K_SPLITED BIT(52) /* splited 64K gtt entry */
static unsigned long gen8_gtt_get_pfn(struct intel_gvt_gtt_entry *e)
{
unsigned long pfn;
@ -427,6 +430,21 @@ static void gtt_entry_set_present(struct intel_gvt_gtt_entry *e)
e->val64 |= _PAGE_PRESENT;
}
static bool gen8_gtt_test_64k_splited(struct intel_gvt_gtt_entry *e)
{
return !!(e->val64 & GTT_SPTE_FLAG_64K_SPLITED);
}
static void gen8_gtt_set_64k_splited(struct intel_gvt_gtt_entry *e)
{
e->val64 |= GTT_SPTE_FLAG_64K_SPLITED;
}
static void gen8_gtt_clear_64k_splited(struct intel_gvt_gtt_entry *e)
{
e->val64 &= ~GTT_SPTE_FLAG_64K_SPLITED;
}
/*
* Per-platform GMA routines.
*/
@ -461,6 +479,9 @@ static struct intel_gvt_gtt_pte_ops gen8_gtt_pte_ops = {
.test_pse = gen8_gtt_test_pse,
.clear_ips = gen8_gtt_clear_ips,
.test_ips = gen8_gtt_test_ips,
.clear_64k_splited = gen8_gtt_clear_64k_splited,
.set_64k_splited = gen8_gtt_set_64k_splited,
.test_64k_splited = gen8_gtt_test_64k_splited,
.get_pfn = gen8_gtt_get_pfn,
.set_pfn = gen8_gtt_set_pfn,
};

3
drivers/gpu/drm/i915/gvt/gtt.h
View file

@ -65,6 +65,9 @@ struct intel_gvt_gtt_pte_ops {
bool (*test_pse)(struct intel_gvt_gtt_entry *e);
bool (*test_ips)(struct intel_gvt_gtt_entry *e);
void (*clear_ips)(struct intel_gvt_gtt_entry *e);
bool (*test_64k_splited)(struct intel_gvt_gtt_entry *e);
void (*clear_64k_splited)(struct intel_gvt_gtt_entry *e);
void (*set_64k_splited)(struct intel_gvt_gtt_entry *e);
void (*set_pfn)(struct intel_gvt_gtt_entry *e, unsigned long pfn);
unsigned long (*get_pfn)(struct intel_gvt_gtt_entry *e);
};