On Thu, Feb 16, 2023 at 06:17:39PM +0200, Jani Nikula wrote:
> sizeof(struct intel_dmc) > 1024 bytes, allocated on all platforms as
> part of struct drm_i915_private, whether they have DMC or not.
>
> Allocate struct intel_dmc dynamically, and hide all the dmc details
> behind an opaque pointer in intel_dmc.c.
>
> Care must be taken to take into account all cases: DMC not supported on
> the platform, DMC supported but not initialized, and DMC initialized but
> not loaded. For the second case, we need to move the wakeref out of
> struct intel_dmc.
>
> Cc: Imre Deak <imre.deak@xxxxxxxxx>
> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> ---
> .../gpu/drm/i915/display/intel_display_core.h | 8 ++-
> drivers/gpu/drm/i915/display/intel_dmc.c | 50 +++++++++++++++++--
> drivers/gpu/drm/i915/display/intel_dmc.h | 34 +------------
> .../drm/i915/display/intel_modeset_setup.c | 1 +
> 4 files changed, 53 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_core.h b/drivers/gpu/drm/i915/display/intel_display_core.h
> index b870f7f47f2b..ff51149c5fcb 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_core.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_core.h
> @@ -19,7 +19,6 @@
> #include "intel_cdclk.h"
> #include "intel_display_limits.h"
> #include "intel_display_power.h"
> -#include "intel_dmc.h"
> #include "intel_dpll_mgr.h"
> #include "intel_fbc.h"
> #include "intel_global_state.h"
> @@ -40,6 +39,7 @@ struct intel_cdclk_vals;
> struct intel_color_funcs;
> struct intel_crtc;
> struct intel_crtc_state;
> +struct intel_dmc;
> struct intel_dpll_funcs;
> struct intel_dpll_mgr;
> struct intel_fbdev;
> @@ -340,6 +340,11 @@ struct intel_display {
> spinlock_t phy_lock;
> } dkl;
>
> + struct {
> + struct intel_dmc *dmc;
> + intel_wakeref_t wakeref;
> + } dmc;
> +
> struct {
> /* VLV/CHV/BXT/GLK DSI MMIO register base address */
> u32 mmio_base;
> @@ -467,7 +472,6 @@ struct intel_display {
>
> /* Grouping using named structs. Keep sorted. */
> struct intel_audio audio;
> - struct intel_dmc dmc;
> struct intel_dpll dpll;
> struct intel_fbc *fbc[I915_MAX_FBCS];
> struct intel_frontbuffer_tracking fb_tracking;
> diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c b/drivers/gpu/drm/i915/display/intel_dmc.c
> index 1d156ac2eb4c..8428d08e0c3d 100644
> --- a/drivers/gpu/drm/i915/display/intel_dmc.c
> +++ b/drivers/gpu/drm/i915/display/intel_dmc.c
> @@ -38,9 +38,37 @@
> * low-power state and comes back to normal.
> */
>
> +enum intel_dmc_id {
> + DMC_FW_MAIN = 0,
> + DMC_FW_PIPEA,
> + DMC_FW_PIPEB,
> + DMC_FW_PIPEC,
> + DMC_FW_PIPED,
> + DMC_FW_MAX
> +};
> +
> +struct intel_dmc {
> + struct drm_i915_private *i915;
> + struct work_struct work;
> + const char *fw_path;
> + u32 max_fw_size; /* bytes */
> + u32 version;
> + struct dmc_fw_info {
> + u32 mmio_count;
> + i915_reg_t mmioaddr[20];
> + u32 mmiodata[20];
> + u32 dmc_offset;
> + u32 start_mmioaddr;
> + u32 dmc_fw_size; /*dwords */
> + u32 *payload;
> + bool present;
> + } dmc_info[DMC_FW_MAX];
> +};
> +
> +/* Note: This may be NULL. */
> static struct intel_dmc *i915_to_dmc(struct drm_i915_private *i915)
> {
> - return &i915->display.dmc;
> + return i915->display.dmc.dmc;
> }
>
> #define DMC_VERSION(major, minor) ((major) << 16 | (minor))
> @@ -937,7 +965,10 @@ void intel_dmc_init(struct drm_i915_private *dev_priv)
> if (!HAS_DMC(dev_priv))
> return;
>
> - dmc = i915_to_dmc(dev_priv);
> + dmc = kzalloc(sizeof(*dmc), GFP_KERNEL);
> + if (!dmc)
> + return;
Couldn't driver loading fail in this case instead (simplifying the
dmc==NULL checks elsewhere)?
> +
> dmc->i915 = dev_priv;
>
> INIT_WORK(&dmc->work, dmc_load_work_fn);
> @@ -991,10 +1022,9 @@ void intel_dmc_init(struct drm_i915_private *dev_priv)
>
> if (dev_priv->params.dmc_firmware_path) {
> if (strlen(dev_priv->params.dmc_firmware_path) == 0) {
> - dmc->fw_path = NULL;
> drm_info(&dev_priv->drm,
> "Disabling DMC firmware and runtime PM\n");
> - return;
> + goto out;
> }
>
> dmc->fw_path = dev_priv->params.dmc_firmware_path;
> @@ -1003,11 +1033,18 @@ void intel_dmc_init(struct drm_i915_private *dev_priv)
> if (!dmc->fw_path) {
> drm_dbg_kms(&dev_priv->drm,
> "No known DMC firmware for platform, disabling runtime PM\n");
> - return;
> + goto out;
> }
>
> + dev_priv->display.dmc.dmc = dmc;
> +
> drm_dbg_kms(&dev_priv->drm, "Loading %s\n", dmc->fw_path);
> schedule_work(&dmc->work);
> +
> + return;
> +
> +out:
> + kfree(dmc);
> }
>
> /**
> @@ -1074,6 +1111,9 @@ void intel_dmc_fini(struct drm_i915_private *dev_priv)
> if (dmc) {
> for_each_dmc_id(dmc_id)
> kfree(dmc->dmc_info[dmc_id].payload);
> +
> + kfree(dmc);
> + dev_priv->display.dmc.dmc = NULL;
> }
> }
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dmc.h b/drivers/gpu/drm/i915/display/intel_dmc.h
> index b74635497aa7..fd607afff2ef 100644
> --- a/drivers/gpu/drm/i915/display/intel_dmc.h
> +++ b/drivers/gpu/drm/i915/display/intel_dmc.h
> @@ -6,44 +6,12 @@
> #ifndef __INTEL_DMC_H__
> #define __INTEL_DMC_H__
>
> -#include "i915_reg_defs.h"
> -#include "intel_wakeref.h"
> -#include <linux/workqueue.h>
> +#include <linux/types.h>
>
> struct drm_i915_error_state_buf;
> struct drm_i915_private;
> -
> enum pipe;
>
> -enum intel_dmc_id {
> - DMC_FW_MAIN = 0,
> - DMC_FW_PIPEA,
> - DMC_FW_PIPEB,
> - DMC_FW_PIPEC,
> - DMC_FW_PIPED,
> - DMC_FW_MAX
> -};
> -
> -struct intel_dmc {
> - struct drm_i915_private *i915;
> - struct work_struct work;
> - const char *fw_path;
> - u32 max_fw_size; /* bytes */
> - u32 version;
> - struct dmc_fw_info {
> - u32 mmio_count;
> - i915_reg_t mmioaddr[20];
> - u32 mmiodata[20];
> - u32 dmc_offset;
> - u32 start_mmioaddr;
> - u32 dmc_fw_size; /*dwords */
> - u32 *payload;
> - bool present;
> - } dmc_info[DMC_FW_MAX];
> -
> - intel_wakeref_t wakeref;
> -};
> -
> void intel_dmc_init(struct drm_i915_private *i915);
> void intel_dmc_load_program(struct drm_i915_private *i915);
> void intel_dmc_disable_program(struct drm_i915_private *i915);
> diff --git a/drivers/gpu/drm/i915/display/intel_modeset_setup.c b/drivers/gpu/drm/i915/display/intel_modeset_setup.c
> index 5359b9663a07..42bfd56fcbe4 100644
> --- a/drivers/gpu/drm/i915/display/intel_modeset_setup.c
> +++ b/drivers/gpu/drm/i915/display/intel_modeset_setup.c
> @@ -22,6 +22,7 @@
> #include "intel_display.h"
> #include "intel_display_power.h"
> #include "intel_display_types.h"
> +#include "intel_dmc.h"
> #include "intel_modeset_setup.h"
> #include "intel_pch_display.h"
> #include "intel_pm.h"
> --
> 2.34.1
>
