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drm/amdgpu: optimize amdgpu driver load & resume time 

amdgpu_device_resume() & amdgpu_device_init() have a high
time consuming call of amdgpu_late_init() which sets the
clock_gating state of all IP blocks and is blocking.
This patch defers only this setting of clock gating state
operation to post resume of amdgpu driver but ideally before
the UI comes up or in some cases post ui as well.

With this change the resume time of amdgpu_device comes down
from 1.299s to 0.199s which further helps in reducing the overall
system resume time.

V1: made the optimization applicable during driver load as well.

TEST:(For ChromiumOS on STONEY only)
* UI comes up
* amdgpu_late_init() call gets called consistently and no errors reported.

Signed-off-by: Shirish S <shirish.s@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Shirish S 2017-05-25 10:05:25 +05:30 committed by Alex Deucher
parent 7e1544ae4d
commit 2dc80b0065
2 changed files with 41 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/amd/amdgpu/amdgpu.h
View File

@ -1613,6 +1613,9 @@ struct amdgpu_device {
/* amdkfd interface */
struct kfd_dev *kfd;
/* delayed work_func for deferring clockgating during resume */
struct delayed_work late_init_work;
struct amdgpu_virt virt;
/* link all shadow bo */

50
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
View File

@ -57,6 +57,8 @@
MODULE_FIRMWARE("amdgpu/vega10_gpu_info.bin");
MODULE_FIRMWARE("amdgpu/raven_gpu_info.bin");
#define AMDGPU_RESUME_MS 2000
static int amdgpu_debugfs_regs_init(struct amdgpu_device *adev);
static void amdgpu_debugfs_regs_cleanup(struct amdgpu_device *adev);
@ -1669,6 +1671,29 @@ static bool amdgpu_check_vram_lost(struct amdgpu_device *adev)
AMDGPU_RESET_MAGIC_NUM);
}
static int amdgpu_late_set_cg_state(struct amdgpu_device *adev)
{
int i = 0, r;
for (i = 0; i < adev->num_ip_blocks; i++) {
if (!adev->ip_blocks[i].status.valid)
continue;
/* skip CG for VCE/UVD, it's handled specially */
if (adev->ip_blocks[i].version->type != AMD_IP_BLOCK_TYPE_UVD &&
adev->ip_blocks[i].version->type != AMD_IP_BLOCK_TYPE_VCE) {
/* enable clockgating to save power */
r = adev->ip_blocks[i].version->funcs->set_clockgating_state((void *)adev,
AMD_CG_STATE_GATE);
if (r) {
DRM_ERROR("set_clockgating_state(gate) of IP block <%s> failed %d\n",
adev->ip_blocks[i].version->funcs->name, r);
return r;
}
}
}
return 0;
}
static int amdgpu_late_init(struct amdgpu_device *adev)
{
int i = 0, r;
@ -1685,20 +1710,11 @@ static int amdgpu_late_init(struct amdgpu_device *adev)
}
adev->ip_blocks[i].status.late_initialized = true;
}
/* skip CG for VCE/UVD, it's handled specially */
if (adev->ip_blocks[i].version->type != AMD_IP_BLOCK_TYPE_UVD &&
adev->ip_blocks[i].version->type != AMD_IP_BLOCK_TYPE_VCE) {
/* enable clockgating to save power */
r = adev->ip_blocks[i].version->funcs->set_clockgating_state((void *)adev,
AMD_CG_STATE_GATE);
if (r) {
DRM_ERROR("set_clockgating_state(gate) of IP block <%s> failed %d\n",
adev->ip_blocks[i].version->funcs->name, r);
return r;
}
}
}
mod_delayed_work(system_wq, &adev->late_init_work,
msecs_to_jiffies(AMDGPU_RESUME_MS));
amdgpu_fill_reset_magic(adev);
return 0;
@ -1791,6 +1807,13 @@ static int amdgpu_fini(struct amdgpu_device *adev)
return 0;
}
static void amdgpu_late_init_func_handler(struct work_struct *work)
{
struct amdgpu_device *adev =
container_of(work, struct amdgpu_device, late_init_work.work);
amdgpu_late_set_cg_state(adev);
}
int amdgpu_suspend(struct amdgpu_device *adev)
{
int i, r;
@ -2050,6 +2073,8 @@ int amdgpu_device_init(struct amdgpu_device *adev,
INIT_LIST_HEAD(&adev->gtt_list);
spin_lock_init(&adev->gtt_list_lock);
INIT_DELAYED_WORK(&adev->late_init_work, amdgpu_late_init_func_handler);
if (adev->asic_type >= CHIP_BONAIRE) {
adev->rmmio_base = pci_resource_start(adev->pdev, 5);
adev->rmmio_size = pci_resource_len(adev->pdev, 5);
@ -2247,6 +2272,7 @@ void amdgpu_device_fini(struct amdgpu_device *adev)
amdgpu_fbdev_fini(adev);
r = amdgpu_fini(adev);
adev->accel_working = false;
cancel_delayed_work_sync(&adev->late_init_work);
/* free i2c buses */
amdgpu_i2c_fini(adev);
amdgpu_atombios_fini(adev);