Re: [PATCH 05/19] drm/i915: add initial Runtime PM functions

Rodrigo Vivi
2013-11-29T12:54:06Z

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>

On Wed, Nov 27, 2013 at 06:10:30PM -0200, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zanoni@intel.com>
>
> This patch adds the initial infrastructure to allow a Runtime PM
> implementation that sets the device to its D3 state. The patch just
> adds the necessary callbacks and the initial infrastructure.
>
> We still don't have any platform that actually uses this
> infrastructure, we still don't call get/put in all the places we need
> to, and we don't have any function to save/restore the state of the
> registers. This is not a problem since no platform uses the code added
> by this patch. We have a few people simultaneously working on runtime
> PM, so this initial code could help everybody make their plans.
>
> V2: - Move some functions to intel_pm.c
> - Remove useless pm_runtime_allow() call at init
> - Remove useless pm_runtime_mark_last_busy() call at get
> - Use pm_runtime_get_sync() instead of 2 calls
> - Add a WARN to check if we're really awake
>
> V3: - Rebase.
>
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
> ---
> drivers/gpu/drm/i915/i915_dma.c | 6 ++++
> drivers/gpu/drm/i915/i915_drv.c | 42 ++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/i915_drv.h | 7 +++++
> drivers/gpu/drm/i915/intel_drv.h | 4 +++
> drivers/gpu/drm/i915/intel_pm.c | 56 +++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_uncore.c | 9 ++++++
> 6 files changed, 124 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index 89e4cf1..4cdc1ee 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -42,6 +42,8 @@
> #include <linux/vga_switcheroo.h>
> #include <linux/slab.h>
> #include <acpi/video.h>
> +#include <linux/pm.h>
> +#include <linux/pm_runtime.h>
>
> #define LP_RING(d) (&((struct drm_i915_private *)(d))->ring[RCS])
>
> @@ -1663,6 +1665,8 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
> if (IS_GEN5(dev))
> intel_gpu_ips_init(dev_priv);
>
> + intel_init_runtime_pm(dev_priv);
> +
> return 0;
>
> out_power_well:
> @@ -1702,6 +1706,8 @@ int i915_driver_unload(struct drm_device *dev)
> struct drm_i915_private *dev_priv = dev->dev_private;
> int ret;
>
> + intel_fini_runtime_pm(dev_priv);
> +
> intel_gpu_ips_teardown();
>
> /* The i915.ko module is still not prepared to be loaded when
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 0ec0fb3..d5310a0 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -502,6 +502,8 @@ static int i915_drm_freeze(struct drm_device *dev)
> struct drm_i915_private *dev_priv = dev->dev_private;
> struct drm_crtc *crtc;
>
> + intel_runtime_pm_get(dev_priv);
> +
> /* ignore lid events during suspend */
> mutex_lock(&dev_priv->modeset_restore_lock);
> dev_priv->modeset_restore = MODESET_SUSPENDED;
> @@ -688,6 +690,8 @@ static int __i915_drm_thaw(struct drm_device *dev, bool restore_gtt_mappings)
> mutex_lock(&dev_priv->modeset_restore_lock);
> dev_priv->modeset_restore = MODESET_DONE;
> mutex_unlock(&dev_priv->modeset_restore_lock);
> +
> + intel_runtime_pm_put(dev_priv);
> return error;
> }
>
> @@ -902,6 +906,42 @@ static int i915_pm_poweroff(struct device *dev)
> return i915_drm_freeze(drm_dev);
> }
>
> +static int i915_runtime_suspend(struct device *device)
> +{
> + struct pci_dev *pdev = to_pci_dev(device);
> + struct drm_device *dev = pci_get_drvdata(pdev);
> + struct drm_i915_private *dev_priv = dev->dev_private;
> +
> + WARN_ON(!HAS_RUNTIME_PM(dev));
> +
> + DRM_DEBUG_KMS("Suspending device\n");
> +
> + dev_priv->pm.suspended = true;
> +
> + pci_save_state(pdev);
> + pci_set_power_state(pdev, PCI_D3cold);
> +
> + return 0;
> +}
> +
> +static int i915_runtime_resume(struct device *device)
> +{
> + struct pci_dev *pdev = to_pci_dev(device);
> + struct drm_device *dev = pci_get_drvdata(pdev);
> + struct drm_i915_private *dev_priv = dev->dev_private;
> +
> + WARN_ON(!HAS_RUNTIME_PM(dev));
> +
> + DRM_DEBUG_KMS("Resuming device\n");
> +
> + pci_set_power_state(pdev, PCI_D0);
> + pci_restore_state(pdev);
> +
> + dev_priv->pm.suspended = false;
> +
> + return 0;
> +}
> +
> static const struct dev_pm_ops i915_pm_ops = {
> .suspend = i915_pm_suspend,
> .resume = i915_pm_resume,
> @@ -909,6 +949,8 @@ static const struct dev_pm_ops i915_pm_ops = {
> .thaw = i915_pm_thaw,
> .poweroff = i915_pm_poweroff,
> .restore = i915_pm_resume,
> + .runtime_suspend = i915_runtime_suspend,
> + .runtime_resume = i915_runtime_resume,
> };
>
> static const struct vm_operations_struct i915_gem_vm_ops = {
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 00a0217..309ac40 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1291,6 +1291,10 @@ struct i915_package_c8 {
> } regsave;
> };
>
> +struct i915_runtime_pm {
> + bool suspended;
> +};
> +
> enum intel_pipe_crc_source {
> INTEL_PIPE_CRC_SOURCE_NONE,
> INTEL_PIPE_CRC_SOURCE_PLANE1,
> @@ -1521,6 +1525,8 @@ typedef struct drm_i915_private {
>
> struct i915_package_c8 pc8;
>
> + struct i915_runtime_pm pm;
> +
> /* Old dri1 support infrastructure, beware the dragons ya fools entering
> * here! */
> struct i915_dri1_state dri1;
> @@ -1845,6 +1851,7 @@ struct drm_i915_file_private {
> #define HAS_FPGA_DBG_UNCLAIMED(dev) (INTEL_INFO(dev)->has_fpga_dbg)
> #define HAS_PSR(dev) (IS_HASWELL(dev) || IS_BROADWELL(dev))
> #define HAS_PC8(dev) (IS_HASWELL(dev)) /* XXX HSW:ULX */
> +#define HAS_RUNTIME_PM(dev) false
>
> #define INTEL_PCH_DEVICE_ID_MASK 0xff00
> #define INTEL_PCH_IBX_DEVICE_ID_TYPE 0x3b00
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 0231281..5596498 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -856,6 +856,10 @@ void gen6_rps_idle(struct drm_i915_private *dev_priv);
> void gen6_rps_boost(struct drm_i915_private *dev_priv);
> void intel_aux_display_runtime_get(struct drm_i915_private *dev_priv);
> void intel_aux_display_runtime_put(struct drm_i915_private *dev_priv);
> +void intel_runtime_pm_get(struct drm_i915_private *dev_priv);
> +void intel_runtime_pm_put(struct drm_i915_private *dev_priv);
> +void intel_init_runtime_pm(struct drm_i915_private *dev_priv);
> +void intel_fini_runtime_pm(struct drm_i915_private *dev_priv);
> void ilk_wm_get_hw_state(struct drm_device *dev);
>
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 1cb02b1..6374884 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -31,6 +31,7 @@
> #include "../../../platform/x86/intel_ips.h"
> #include <linux/module.h>
> #include <drm/i915_powerwell.h>
> +#include <linux/pm_runtime.h>
>
> /**
> * RC6 is a special power stage which allows the GPU to enter an very
> @@ -5953,6 +5954,61 @@ void intel_aux_display_runtime_put(struct drm_i915_private *dev_priv)
> hsw_enable_package_c8(dev_priv);
> }
>
> +void intel_runtime_pm_get(struct drm_i915_private *dev_priv)
> +{
> + struct drm_device *dev = dev_priv->dev;
> + struct device *device = &dev->pdev->dev;
> +
> + if (!HAS_RUNTIME_PM(dev))
> + return;
> +
> + pm_runtime_get_sync(device);
> + WARN(dev_priv->pm.suspended, "Device still suspended.\n");
> +}
> +
> +void intel_runtime_pm_put(struct drm_i915_private *dev_priv)
> +{
> + struct drm_device *dev = dev_priv->dev;
> + struct device *device = &dev->pdev->dev;
> +
> + if (!HAS_RUNTIME_PM(dev))
> + return;
> +
> + pm_runtime_mark_last_busy(device);
> + pm_runtime_put_autosuspend(device);
> +}
> +
> +void intel_init_runtime_pm(struct drm_i915_private *dev_priv)
> +{
> + struct drm_device *dev = dev_priv->dev;
> + struct device *device = &dev->pdev->dev;
> +
> + dev_priv->pm.suspended = false;
> +
> + if (!HAS_RUNTIME_PM(dev))
> + return;
> +
> + pm_runtime_set_active(device);
> + pm_runtime_enable(device);
> +
> + pm_runtime_set_autosuspend_delay(device, 10000); /* 10s */
> + pm_runtime_mark_last_busy(device);
> + pm_runtime_use_autosuspend(device);
> +}
> +
> +void intel_fini_runtime_pm(struct drm_i915_private *dev_priv)
> +{
> + struct drm_device *dev = dev_priv->dev;
> + struct device *device = &dev->pdev->dev;
> +
> + if (!HAS_RUNTIME_PM(dev))
> + return;
> +
> + /* Make sure we're not suspended first. */
> + pm_runtime_get_sync(device);
> + pm_runtime_disable(device);
> +}
> +
> /* Set up chip specific power management-related functions */
> void intel_init_pm(struct drm_device *dev)
> {
> diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
> index 7619d87..00e5ced 100644
> --- a/drivers/gpu/drm/i915/intel_uncore.c
> +++ b/drivers/gpu/drm/i915/intel_uncore.c
> @@ -433,6 +433,13 @@ hsw_unclaimed_reg_check(struct drm_i915_private *dev_priv, u32 reg)
> }
> }
>
> +static void
> +assert_device_not_suspended(struct drm_i915_private *dev_priv)
> +{
> + WARN(HAS_RUNTIME_PM(dev_priv->dev) && dev_priv->pm.suspended,
> + "Device suspended\n");
> +}
> +
> #define REG_READ_HEADER(x) \
> unsigned long irqflags; \
> u##x val = 0; \
> @@ -561,6 +568,7 @@ gen6_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace
> if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
> __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
> } \
> + assert_device_not_suspended(dev_priv); \
> __raw_i915_write##x(dev_priv, reg, val); \
> if (unlikely(__fifo_ret)) { \
> gen6_gt_check_fifodbg(dev_priv); \
> @@ -576,6 +584,7 @@ hsw_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace)
> if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
> __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
> } \
> + assert_device_not_suspended(dev_priv); \
> hsw_unclaimed_reg_clear(dev_priv, reg); \
> __raw_i915_write##x(dev_priv, reg, val); \
> if (unlikely(__fifo_ret)) { \
> --
> 1.8.3.1
>
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