drm/i915/guc/ct: Group request-related variables in a sub-structure

For better isolation of the request tracking from the rest of the
CT-related data.

v2: split to separate patch, move next_fence to substructure (Michal)

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191217012316.13271-4-daniele.ceraolospurio@intel.com

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
index 4e20f6c..f22cd9b 100644 (file)
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
@@ -37,10 +37,10 @@ static void ct_incoming_request_worker_func(struct work_struct *w);
  */
 void intel_guc_ct_init_early(struct intel_guc_ct *ct)
 {
-       spin_lock_init(&ct->lock);
-       INIT_LIST_HEAD(&ct->pending_requests);
-       INIT_LIST_HEAD(&ct->incoming_requests);
-       INIT_WORK(&ct->worker, ct_incoming_request_worker_func);
+       spin_lock_init(&ct->requests.lock);
+       INIT_LIST_HEAD(&ct->requests.pending);
+       INIT_LIST_HEAD(&ct->requests.incoming);
+       INIT_WORK(&ct->requests.worker, ct_incoming_request_worker_func);
 }
 
 static inline struct intel_guc *ct_to_guc(struct intel_guc_ct *ct)
@@ -267,7 +267,7 @@ void intel_guc_ct_disable(struct intel_guc_ct *ct)
 static u32 ct_get_next_fence(struct intel_guc_ct *ct)
 {
        /* For now it's trivial */
-       return ++ct->next_fence;
+       return ++ct->requests.next_fence;
 }
 
 /**
@@ -465,9 +465,9 @@ static int ct_send(struct intel_guc_ct *ct,
        request.response_len = response_buf_size;
        request.response_buf = response_buf;
 
-       spin_lock_irqsave(&ct->lock, flags);
-       list_add_tail(&request.link, &ct->pending_requests);
-       spin_unlock_irqrestore(&ct->lock, flags);
+       spin_lock_irqsave(&ct->requests.lock, flags);
+       list_add_tail(&request.link, &ct->requests.pending);
+       spin_unlock_irqrestore(&ct->requests.lock, flags);
 
        err = ctb_write(ctb, action, len, fence, !!response_buf);
        if (unlikely(err))
@@ -500,9 +500,9 @@ static int ct_send(struct intel_guc_ct *ct,
        }
 
 unlink:
-       spin_lock_irqsave(&ct->lock, flags);
+       spin_lock_irqsave(&ct->requests.lock, flags);
        list_del(&request.link);
-       spin_unlock_irqrestore(&ct->lock, flags);
+       spin_unlock_irqrestore(&ct->requests.lock, flags);
 
        return err;
 }
@@ -650,8 +650,8 @@ static int ct_handle_response(struct intel_guc_ct *ct, const u32 *msg)
 
        CT_DEBUG_DRIVER("CT: response fence %u status %#x\n", fence, status);
 
-       spin_lock(&ct->lock);
-       list_for_each_entry(req, &ct->pending_requests, link) {
+       spin_lock(&ct->requests.lock);
+       list_for_each_entry(req, &ct->requests.pending, link) {
                if (unlikely(fence != req->fence)) {
                        CT_DEBUG_DRIVER("CT: request %u awaits response\n",
                                        req->fence);
@@ -669,7 +669,7 @@ static int ct_handle_response(struct intel_guc_ct *ct, const u32 *msg)
                found = true;
                break;
        }
-       spin_unlock(&ct->lock);
+       spin_unlock(&ct->requests.lock);
 
        if (!found)
                DRM_ERROR("CT: unsolicited response %*ph\n", 4 * msglen, msg);
@@ -707,13 +707,13 @@ static bool ct_process_incoming_requests(struct intel_guc_ct *ct)
        u32 *payload;
        bool done;
 
-       spin_lock_irqsave(&ct->lock, flags);
-       request = list_first_entry_or_null(&ct->incoming_requests,
+       spin_lock_irqsave(&ct->requests.lock, flags);
+       request = list_first_entry_or_null(&ct->requests.incoming,
                                           struct ct_incoming_request, link);
        if (request)
                list_del(&request->link);
-       done = !!list_empty(&ct->incoming_requests);
-       spin_unlock_irqrestore(&ct->lock, flags);
+       done = !!list_empty(&ct->requests.incoming);
+       spin_unlock_irqrestore(&ct->requests.lock, flags);
 
        if (!request)
                return true;
@@ -731,12 +731,13 @@ static bool ct_process_incoming_requests(struct intel_guc_ct *ct)
 
 static void ct_incoming_request_worker_func(struct work_struct *w)
 {
-       struct intel_guc_ct *ct = container_of(w, struct intel_guc_ct, worker);
+       struct intel_guc_ct *ct =
+               container_of(w, struct intel_guc_ct, requests.worker);
        bool done;
 
        done = ct_process_incoming_requests(ct);
        if (!done)
-               queue_work(system_unbound_wq, &ct->worker);
+               queue_work(system_unbound_wq, &ct->requests.worker);
 }
 
 /**
@@ -774,11 +775,11 @@ static int ct_handle_request(struct intel_guc_ct *ct, const u32 *msg)
        }
        memcpy(request->msg, msg, 4 * msglen);
 
-       spin_lock_irqsave(&ct->lock, flags);
-       list_add_tail(&request->link, &ct->incoming_requests);
-       spin_unlock_irqrestore(&ct->lock, flags);
+       spin_lock_irqsave(&ct->requests.lock, flags);
+       list_add_tail(&request->link, &ct->requests.incoming);
+       spin_unlock_irqrestore(&ct->requests.lock, flags);
 
-       queue_work(system_unbound_wq, &ct->worker);
+       queue_work(system_unbound_wq, &ct->requests.worker);
        return 0;
 }
 

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h
index 6e3d789..29a026d 100644 (file)
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h
@@ -48,12 +48,15 @@ struct intel_guc_ct {
        /* buffers for sending(0) and receiving(1) commands */
        struct intel_guc_ct_buffer ctbs[2];
 
-       u32 next_fence; /* fence to be used with next send command */
+       struct {
+               u32 next_fence; /* fence to be used with next request to send */
 
-       spinlock_t lock; /* protects pending requests list */
-       struct list_head pending_requests; /* requests waiting for response */
-       struct list_head incoming_requests; /* incoming requests */
-       struct work_struct worker; /* handler for incoming requests */
+               spinlock_t lock; /* protects pending requests list */
+               struct list_head pending; /* requests waiting for response */
+
+               struct list_head incoming; /* incoming requests */
+               struct work_struct worker; /* handler for incoming requests */
+       } requests;
 };
 
 void intel_guc_ct_init_early(struct intel_guc_ct *ct);