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drm/i915/guc: Splitting CT channel open/close functions

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The aim of this patch is to allow enabling and disabling
of CTB without requiring the mutex lock.

v2: Phasing out ctch_is_enabled function and replacing it with
    ctch->enabled (Daniele)

Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Sujaritha Sundaresan <sujaritha.sundaresan@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190220013927.9488-2-sujaritha.sundaresan@intel.com
This commit is contained in:
Sujaritha Sundaresan 2019-02-19 17:39:26 -08:00 committed by Chris Wilson
parent 9ce25e72cc
commit e0ad3c64fa
3 changed files with 82 additions and 27 deletions
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12
drivers/gpu/drm/i915/intel_guc.c
View File

@ -203,11 +203,19 @@ int intel_guc_init(struct intel_guc *guc)
goto err_log;
GEM_BUG_ON(!guc->ads_vma);
if (HAS_GUC_CT(dev_priv)) {
ret = intel_guc_ct_init(&guc->ct);
if (ret)
goto err_ads;
}
/* We need to notify the guc whenever we change the GGTT */
i915_ggtt_enable_guc(dev_priv);
return 0;
err_ads:
intel_guc_ads_destroy(guc);
err_log:
intel_guc_log_destroy(&guc->log);
err_shared:
@ -222,6 +230,10 @@ void intel_guc_fini(struct intel_guc *guc)
struct drm_i915_private *dev_priv = guc_to_i915(guc);
i915_ggtt_disable_guc(dev_priv);
if (HAS_GUC_CT(dev_priv))
intel_guc_ct_fini(&guc->ct);
intel_guc_ads_destroy(guc);
intel_guc_log_destroy(&guc->log);
guc_shared_data_destroy(guc);

94
drivers/gpu/drm/i915/intel_guc_ct.c
View File

@ -140,11 +140,6 @@ static int guc_action_deregister_ct_buffer(struct intel_guc *guc,
return err;
}
static bool ctch_is_open(struct intel_guc_ct_channel *ctch)
{
return ctch->vma != NULL;
}
static int ctch_init(struct intel_guc *guc,
struct intel_guc_ct_channel *ctch)
{
@ -214,25 +209,21 @@ static int ctch_init(struct intel_guc *guc,
static void ctch_fini(struct intel_guc *guc,
struct intel_guc_ct_channel *ctch)
{
GEM_BUG_ON(ctch->enabled);
i915_vma_unpin_and_release(&ctch->vma, I915_VMA_RELEASE_MAP);
}
static int ctch_open(struct intel_guc *guc,
struct intel_guc_ct_channel *ctch)
static int ctch_enable(struct intel_guc *guc,
struct intel_guc_ct_channel *ctch)
{
u32 base;
int err;
int i;
CT_DEBUG_DRIVER("CT: channel %d reopen=%s\n",
ctch->owner, yesno(ctch_is_open(ctch)));
GEM_BUG_ON(!ctch->vma);
if (!ctch->vma) {
err = ctch_init(guc, ctch);
if (unlikely(err))
goto err_out;
GEM_BUG_ON(!ctch->vma);
}
GEM_BUG_ON(ctch->enabled);
/* vma should be already allocated and map'ed */
base = intel_guc_ggtt_offset(guc, ctch->vma);
@ -255,7 +246,7 @@ static int ctch_open(struct intel_guc *guc,
base + PAGE_SIZE/4 * CTB_RECV,
INTEL_GUC_CT_BUFFER_TYPE_RECV);
if (unlikely(err))
goto err_fini;
goto err_out;
err = guc_action_register_ct_buffer(guc,
base + PAGE_SIZE/4 * CTB_SEND,
@ -263,23 +254,25 @@ static int ctch_open(struct intel_guc *guc,
if (unlikely(err))
goto err_deregister;
ctch->enabled = true;
return 0;
err_deregister:
guc_action_deregister_ct_buffer(guc,
ctch->owner,
INTEL_GUC_CT_BUFFER_TYPE_RECV);
err_fini:
ctch_fini(guc, ctch);
err_out:
DRM_ERROR("CT: can't open channel %d; err=%d\n", ctch->owner, err);
return err;
}
static void ctch_close(struct intel_guc *guc,
struct intel_guc_ct_channel *ctch)
static void ctch_disable(struct intel_guc *guc,
struct intel_guc_ct_channel *ctch)
{
GEM_BUG_ON(!ctch_is_open(ctch));
GEM_BUG_ON(!ctch->enabled);
ctch->enabled = false;
guc_action_deregister_ct_buffer(guc,
ctch->owner,
@ -287,7 +280,6 @@ static void ctch_close(struct intel_guc *guc,
guc_action_deregister_ct_buffer(guc,
ctch->owner,
INTEL_GUC_CT_BUFFER_TYPE_RECV);
ctch_fini(guc, ctch);
}
static u32 ctch_get_next_fence(struct intel_guc_ct_channel *ctch)
@ -481,7 +473,7 @@ static int ctch_send(struct intel_guc_ct *ct,
u32 fence;
int err;
GEM_BUG_ON(!ctch_is_open(ctch));
GEM_BUG_ON(!ctch->enabled);
GEM_BUG_ON(!len);
GEM_BUG_ON(len & ~GUC_CT_MSG_LEN_MASK);
GEM_BUG_ON(!response_buf && response_buf_size);
@ -817,7 +809,7 @@ static void ct_process_host_channel(struct intel_guc_ct *ct)
u32 msg[GUC_CT_MSG_LEN_MASK + 1]; /* one extra dw for the header */
int err = 0;
if (!ctch_is_open(ctch))
if (!ctch->enabled)
return;
do {
@ -848,6 +840,51 @@ static void intel_guc_to_host_event_handler_ct(struct intel_guc *guc)
ct_process_host_channel(ct);
}
/**
* intel_guc_ct_init - Init CT communication
* @ct: pointer to CT struct
*
* Allocate memory required for communication via
* the CT channel.
*
* Shall only be called for platforms with HAS_GUC_CT.
*
* Return: 0 on success, a negative errno code on failure.
*/
int intel_guc_ct_init(struct intel_guc_ct *ct)
{
struct intel_guc *guc = ct_to_guc(ct);
struct intel_guc_ct_channel *ctch = &ct->host_channel;
int err;
err = ctch_init(guc, ctch);
if (unlikely(err)) {
DRM_ERROR("CT: can't open channel %d; err=%d\n",
ctch->owner, err);
return err;
}
GEM_BUG_ON(!ctch->vma);
return 0;
}
/**
* intel_guc_ct_fini - Fini CT communication
* @ct: pointer to CT struct
*
* Deallocate memory required for communication via
* the CT channel.
*
* Shall only be called for platforms with HAS_GUC_CT.
*/
void intel_guc_ct_fini(struct intel_guc_ct *ct)
{
struct intel_guc *guc = ct_to_guc(ct);
struct intel_guc_ct_channel *ctch = &ct->host_channel;
ctch_fini(guc, ctch);
}
/**
* intel_guc_ct_enable - Enable buffer based command transport.
* @ct: pointer to CT struct
@ -865,7 +902,10 @@ int intel_guc_ct_enable(struct intel_guc_ct *ct)
GEM_BUG_ON(!HAS_GUC_CT(i915));
err = ctch_open(guc, ctch);
if (ctch->enabled)
return 0;
err = ctch_enable(guc, ctch);
if (unlikely(err))
return err;
@ -890,10 +930,10 @@ void intel_guc_ct_disable(struct intel_guc_ct *ct)
GEM_BUG_ON(!HAS_GUC_CT(i915));
if (!ctch_is_open(ctch))
if (!ctch->enabled)
return;
ctch_close(guc, ctch);
ctch_disable(guc, ctch);
/* Disable send */
guc->send = intel_guc_send_nop;

3
drivers/gpu/drm/i915/intel_guc_ct.h
View File

@ -66,6 +66,7 @@ struct intel_guc_ct_channel {
struct intel_guc_ct_buffer ctbs[2];
u32 owner;
u32 next_fence;
bool enabled;
};
/** Holds all command transport channels.
@ -90,6 +91,8 @@ struct intel_guc_ct {
};
void intel_guc_ct_init_early(struct intel_guc_ct *ct);
int intel_guc_ct_init(struct intel_guc_ct *ct);
void intel_guc_ct_fini(struct intel_guc_ct *ct);
int intel_guc_ct_enable(struct intel_guc_ct *ct);
void intel_guc_ct_disable(struct intel_guc_ct *ct);