On Tue, Feb 01, 2022 at 02:42:20PM -0800, Daniele Ceraolo Spurio wrote:
On 1/26/2022 12:36 PM, Lucas De Marchi wrote:
The ADS initialitazion was using 2 passes to calculate the regset sent
to GuC to initialize each engine: the first pass to just have the final
object size and the second to set each register in place in the final
gem object.
However in order to maintain an ordered set of registers to pass to guc,
each register needs to be added and moved in the final array. The second
phase may actually happen in IO memory rather than system memory and
accessing IO memory by simply dereferencing the pointer doesn't work on
all architectures. Other places of the ADS initializaition were
converted to use the dma_buf_map API, but here there may be a lot more
accesses to IO memory. So, instead of following that same approach,
convert the regset initialization to calculate the final array in 1
pass and in the second pass that array is just copied to its final
location, updating the pointers for each engine written to the ADS blob.
One important thing is that struct temp_regset now have
different semantics: `registers` continues to track the registers of a
single engine, however the other fields are updated together, according
to the newly added `storage`, which tracks the memory allocated for
all the registers. So rename some of these fields and add a
__mmio_reg_add(): this function (possibly) allocates memory and operates
on the storage pointer while guc_mmio_reg_add() continues to manage the
registers pointer.
On a Tiger Lake system using enable_guc=3, the following log message is
now seen:
[ 187.334310] i915 0000:00:02.0: [drm:intel_guc_ads_create [i915]] Used 4 KB for temporary ADS regset
This change has also been tested on an ARM64 host with DG2 and other
discrete graphics cards.
Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: John Harrison <John.C.Harrison@xxxxxxxxx>
Cc: Matthew Brost <matthew.brost@xxxxxxxxx>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/uc/intel_guc.h | 7 ++
drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c | 117 +++++++++++++--------
2 files changed, 79 insertions(+), 45 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index e2e0df1c3d91..4c852eee3ad8 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
@@ -152,6 +152,13 @@ struct intel_guc {
struct dma_buf_map ads_map;
/** @ads_regset_size: size of the save/restore regsets in the ADS */
u32 ads_regset_size;
+ /**
+ * @ads_regset_count: number of save/restore registers in the ADS for
+ * each engine
+ */
+ u32 ads_regset_count[I915_NUM_ENGINES];
+ /** @ads_regset: save/restore regsets in the ADS */
+ struct guc_mmio_reg *ads_regset;
/** @ads_golden_ctxt_size: size of the golden contexts in the ADS */
u32 ads_golden_ctxt_size;
/** @ads_engine_usage_size: size of engine usage in the ADS */
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
index 73ca34de44f7..390101ee3661 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
@@ -226,14 +226,13 @@ static void guc_mapping_table_init(struct intel_gt *gt,
/*
* The save/restore register list must be pre-calculated to a temporary
- * buffer of driver defined size before it can be generated in place
- * inside the ADS.
+ * buffer before it can be copied inside the ADS.
*/
-#define MAX_MMIO_REGS 128 /* Arbitrary size, increase as needed */
struct temp_regset {
struct guc_mmio_reg *registers;
- u32 used;
- u32 size;
+ struct guc_mmio_reg *storage;
I think this could use a comment to distinguish between registers and
storage. Something like.:
/* ptr to the base of the allocated storage for all engines */
struct guc_mmio_reg *storage;
/* ptr to the section of the storage for the engine currently being
worked on */
struct guc_mmio_reg *registers;
agreed, I will add that
+ u32 storage_used;
+ u32 storage_max;
};
static int guc_mmio_reg_cmp(const void *a, const void *b)
@@ -244,18 +243,44 @@ static int guc_mmio_reg_cmp(const void *a, const void *b)
return (int)ra->offset - (int)rb->offset;
}
+static struct guc_mmio_reg * __must_check
+__mmio_reg_add(struct temp_regset *regset, struct guc_mmio_reg *reg)
+{
+ u32 pos = regset->storage_used;
+ struct guc_mmio_reg *slot;
+
+ if (pos >= regset->storage_max) {
+ size_t size = ALIGN((pos + 1) * sizeof(*slot), PAGE_SIZE);
+ struct guc_mmio_reg *r = krealloc(regset->storage,
+ size, GFP_KERNEL);
+ if (!r) {
+ WARN_ONCE(1, "Incomplete regset list: can't add register (%d)\n",
+ -ENOMEM);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ regset->registers = r + (regset->registers - regset->storage);
+ regset->storage = r;
+ regset->storage_max = size / sizeof(*slot);
+ }
+
+ slot = ®set->storage[pos];
+ regset->storage_used++;
+ *slot = *reg;
+
+ return slot;
+}
+
static long __must_check guc_mmio_reg_add(struct temp_regset *regset,
u32 offset, u32 flags)
{
- u32 count = regset->used;
+ u32 count = regset->storage_used - (regset->registers - regset->storage);
struct guc_mmio_reg reg = {
.offset = offset,
.flags = flags,
};
struct guc_mmio_reg *slot;
- GEM_BUG_ON(count >= regset->size);
-
/*
* The mmio list is built using separate lists within the driver.
* It's possible that at some point we may attempt to add the same
@@ -266,9 +291,9 @@ static long __must_check guc_mmio_reg_add(struct temp_regset *regset,
sizeof(reg), guc_mmio_reg_cmp))
return 0;
- slot = ®set->registers[count];
- regset->used++;
- *slot = reg;
+ slot = __mmio_reg_add(regset, ®);
+ if (IS_ERR(slot))
+ return PTR_ERR(slot);
while (slot-- > regset->registers) {
GEM_BUG_ON(slot[0].offset == slot[1].offset);
@@ -295,7 +320,11 @@ static int guc_mmio_regset_init(struct temp_regset *regset,
unsigned int i;
int ret = 0;
- regset->used = 0;
+ /*
+ * Each engine's registers point to a new start relative to
+ * storage
+ */
+ regset->registers = regset->storage + regset->storage_used;
ret |= GUC_MMIO_REG_ADD(regset, RING_MODE_GEN7(base), true);
ret |= GUC_MMIO_REG_ADD(regset, RING_HWS_PGA(base), false);
@@ -317,32 +346,28 @@ static int guc_mmio_regset_init(struct temp_regset *regset,
return ret ? -1 : 0;
}
-static int guc_mmio_reg_state_query(struct intel_guc *guc)
+static long guc_mmio_reg_state_create(struct intel_guc *guc)
{
struct intel_gt *gt = guc_to_gt(guc);
struct intel_engine_cs *engine;
enum intel_engine_id id;
- struct temp_regset temp_set;
- u32 total;
+ struct temp_regset temp_set = {};
+ long total = 0;
- /*
- * Need to actually build the list in order to filter out
- * duplicates and other such data dependent constructions.
- */
- temp_set.size = MAX_MMIO_REGS;
- temp_set.registers = kmalloc_array(temp_set.size,
- sizeof(*temp_set.registers),
- GFP_KERNEL);
- if (!temp_set.registers)
- return -ENOMEM;
-
- total = 0;
for_each_engine(engine, gt, id) {
- guc_mmio_regset_init(&temp_set, engine);
- total += temp_set.used;
+ u32 used = temp_set.storage_used;
+
+ if (guc_mmio_regset_init(&temp_set, engine) < 0)
+ return -1;
If you fail here you're leaking temp_set.storage.
thanks for catching this. I fixed it for next version
Also, any reason not to just return the return code from
guc_mmio_regset_init?
no
Apart from these minor comments, the change LGTM. IMO we could also
merge this patch on its own ahead of the rest of the dma_buf code,
because not having to recreate the regset on every reset/resume is
still helpful.
now the dma_buf_map (renamed to iosys_map) is more settled. I will send
everything together once more and than probably split on next versions
if needed.
thanks
Lucas De Marchi
