[Intel-gfx] [PATCH 03/51] drm/i915/guc: Add LRC descriptor context lookup array

Matthew Brost
2021-07-16T20:00:13Z

Add LRC descriptor context lookup array which can resolve the
intel_context from the LRC descriptor index. In addition to lookup, it
can determine if the LRC descriptor context is currently registered with
the GuC by checking if an entry for a descriptor index is present.
Future patches in the series will make use of this array.

v2:
(Michal)
- "linux/xarray.h" -> <linux/xarray.h>
- s/lrc/LRC
(John H)
- Fix commit message

Cc: John Harrison <john.c.harrison@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
---
drivers/gpu/drm/i915/gt/uc/intel_guc.h | 5 +++
.../gpu/drm/i915/gt/uc/intel_guc_submission.c | 32 +++++++++++++++++--
2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 2625d2d5959f..35783558d261 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
@@ -6,6 +6,8 @@
#ifndef _INTEL_GUC_H_
#define _INTEL_GUC_H_

+#include <linux/xarray.h>
+
#include "intel_uncore.h"
#include "intel_guc_fw.h"
#include "intel_guc_fwif.h"
@@ -46,6 +48,9 @@ struct intel_guc {
struct i915_vma *lrc_desc_pool;
void *lrc_desc_pool_vaddr;

+ /* guc_id to intel_context lookup */
+ struct xarray context_lookup;
+
/* Control params for fw initialization */
u32 params[GUC_CTL_MAX_DWORDS];

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index a366890fb840..23a94a896a0b 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -65,8 +65,6 @@ static inline struct i915_priolist *to_priolist(struct rb_node *rb)
return rb_entry(rb, struct i915_priolist, node);
}

-/* Future patches will use this function */
-__attribute__ ((unused))
static struct guc_lrc_desc *__get_lrc_desc(struct intel_guc *guc, u32 index)
{
struct guc_lrc_desc *base = guc->lrc_desc_pool_vaddr;
@@ -76,6 +74,15 @@ static struct guc_lrc_desc *__get_lrc_desc(struct intel_guc *guc, u32 index)
return &base[index];
}

+static inline struct intel_context *__get_context(struct intel_guc *guc, u32 id)
+{
+ struct intel_context *ce = xa_load(&guc->context_lookup, id);
+
+ GEM_BUG_ON(id >= GUC_MAX_LRC_DESCRIPTORS);
+
+ return ce;
+}
+
static int guc_lrc_desc_pool_create(struct intel_guc *guc)
{
u32 size;
@@ -96,6 +103,25 @@ static void guc_lrc_desc_pool_destroy(struct intel_guc *guc)
i915_vma_unpin_and_release(&guc->lrc_desc_pool, I915_VMA_RELEASE_MAP);
}

+static inline void reset_lrc_desc(struct intel_guc *guc, u32 id)
+{
+ struct guc_lrc_desc *desc = __get_lrc_desc(guc, id);
+
+ memset(desc, 0, sizeof(*desc));
+ xa_erase_irq(&guc->context_lookup, id);
+}
+
+static inline bool lrc_desc_registered(struct intel_guc *guc, u32 id)
+{
+ return __get_context(guc, id);
+}
+
+static inline void set_lrc_desc_registered(struct intel_guc *guc, u32 id,
+ struct intel_context *ce)
+{
+ xa_store_irq(&guc->context_lookup, id, ce, GFP_ATOMIC);
+}
+
static void guc_add_request(struct intel_guc *guc, struct i915_request *rq)
{
/* Leaving stub as this function will be used in future patches */
@@ -400,6 +426,8 @@ int intel_guc_submission_init(struct intel_guc *guc)
*/
GEM_BUG_ON(!guc->lrc_desc_pool);

+ xa_init_flags(&guc->context_lookup, XA_FLAGS_LOCK_IRQ);
+
return 0;
}

--
2.28.0