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linux/drivers/gpu/drm/i915/vlv_suspend.c
Jani Nikula d670c78ea7 drm/i915: rename intel_pm.[ch] to intel_clock_gating.[ch] 
Observe that intel_pm.[ch] is now purely about clock gating, so rename
them to intel_clock_gating.[ch]. Rename the functions to
intel_clock_gating_*() to follow coding conventions.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230403122428.3526263-1-jani.nikula@intel.com
2023-04-05 19:54:13 +03:00

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// SPDX-License-Identifier: MIT
/*
* Copyright © 2020 Intel Corporation
*/
#include <linux/string_helpers.h>
#include <linux/kernel.h>
#include <drm/drm_print.h>
#include "i915_drv.h"
#include "i915_reg.h"
#include "i915_trace.h"
#include "i915_utils.h"
#include "intel_clock_gating.h"
#include "vlv_suspend.h"
#include "gt/intel_gt_regs.h"
struct vlv_s0ix_state {
/* GAM */
u32 wr_watermark;
u32 gfx_prio_ctrl;
u32 arb_mode;
u32 gfx_pend_tlb0;
u32 gfx_pend_tlb1;
u32 lra_limits[GEN7_LRA_LIMITS_REG_NUM];
u32 media_max_req_count;
u32 gfx_max_req_count;
u32 render_hwsp;
u32 ecochk;
u32 bsd_hwsp;
u32 blt_hwsp;
u32 tlb_rd_addr;
/* MBC */
u32 g3dctl;
u32 gsckgctl;
u32 mbctl;
/* GCP */
u32 ucgctl1;
u32 ucgctl3;
u32 rcgctl1;
u32 rcgctl2;
u32 rstctl;
u32 misccpctl;
/* GPM */
u32 gfxpause;
u32 rpdeuhwtc;
u32 rpdeuc;
u32 ecobus;
u32 pwrdwnupctl;
u32 rp_down_timeout;
u32 rp_deucsw;
u32 rcubmabdtmr;
u32 rcedata;
u32 spare2gh;
/* Display 1 CZ domain */
u32 gt_imr;
u32 gt_ier;
u32 pm_imr;
u32 pm_ier;
u32 gt_scratch[GEN7_GT_SCRATCH_REG_NUM];
/* GT SA CZ domain */
u32 tilectl;
u32 gt_fifoctl;
u32 gtlc_wake_ctrl;
u32 gtlc_survive;
u32 pmwgicz;
/* Display 2 CZ domain */
u32 gu_ctl0;
u32 gu_ctl1;
u32 pcbr;
u32 clock_gate_dis2;
};
/*
* Save all Gunit registers that may be lost after a D3 and a subsequent
* S0i[R123] transition. The list of registers needing a save/restore is
* defined in the VLV2_S0IXRegs document. This documents marks all Gunit
* registers in the following way:
* - Driver: saved/restored by the driver
* - Punit : saved/restored by the Punit firmware
* - No, w/o marking: no need to save/restore, since the register is R/O or
* used internally by the HW in a way that doesn't depend
* keeping the content across a suspend/resume.
* - Debug : used for debugging
*
* We save/restore all registers marked with 'Driver', with the following
* exceptions:
* - Registers out of use, including also registers marked with 'Debug'.
* These have no effect on the driver's operation, so we don't save/restore
* them to reduce the overhead.
* - Registers that are fully setup by an initialization function called from
* the resume path. For example many clock gating and RPS/RC6 registers.
* - Registers that provide the right functionality with their reset defaults.
*
* TODO: Except for registers that based on the above 3 criteria can be safely
* ignored, we save/restore all others, practically treating the HW context as
* a black-box for the driver. Further investigation is needed to reduce the
* saved/restored registers even further, by following the same 3 criteria.
*/
static void vlv_save_gunit_s0ix_state(struct drm_i915_private *i915)
{
struct vlv_s0ix_state *s = i915->vlv_s0ix_state;
struct intel_uncore *uncore = &i915->uncore;
int i;
if (!s)
return;
/* GAM 0x4000-0x4770 */
s->wr_watermark = intel_uncore_read(uncore, GEN7_WR_WATERMARK);
s->gfx_prio_ctrl = intel_uncore_read(uncore, GEN7_GFX_PRIO_CTRL);
s->arb_mode = intel_uncore_read(uncore, ARB_MODE);
s->gfx_pend_tlb0 = intel_uncore_read(uncore, GEN7_GFX_PEND_TLB0);
s->gfx_pend_tlb1 = intel_uncore_read(uncore, GEN7_GFX_PEND_TLB1);
for (i = 0; i < ARRAY_SIZE(s->lra_limits); i++)
s->lra_limits[i] = intel_uncore_read(uncore, GEN7_LRA_LIMITS(i));
s->media_max_req_count = intel_uncore_read(uncore, GEN7_MEDIA_MAX_REQ_COUNT);
s->gfx_max_req_count = intel_uncore_read(uncore, GEN7_GFX_MAX_REQ_COUNT);
s->render_hwsp = intel_uncore_read(uncore, RENDER_HWS_PGA_GEN7);
s->ecochk = intel_uncore_read(uncore, GAM_ECOCHK);
s->bsd_hwsp = intel_uncore_read(uncore, BSD_HWS_PGA_GEN7);
s->blt_hwsp = intel_uncore_read(uncore, BLT_HWS_PGA_GEN7);
s->tlb_rd_addr = intel_uncore_read(uncore, GEN7_TLB_RD_ADDR);
/* MBC 0x9024-0x91D0, 0x8500 */
s->g3dctl = intel_uncore_read(uncore, VLV_G3DCTL);
s->gsckgctl = intel_uncore_read(uncore, VLV_GSCKGCTL);
s->mbctl = intel_uncore_read(uncore, GEN6_MBCTL);
/* GCP 0x9400-0x9424, 0x8100-0x810C */
s->ucgctl1 = intel_uncore_read(uncore, GEN6_UCGCTL1);
s->ucgctl3 = intel_uncore_read(uncore, GEN6_UCGCTL3);
s->rcgctl1 = intel_uncore_read(uncore, GEN6_RCGCTL1);
s->rcgctl2 = intel_uncore_read(uncore, GEN6_RCGCTL2);
s->rstctl = intel_uncore_read(uncore, GEN6_RSTCTL);
s->misccpctl = intel_uncore_read(uncore, GEN7_MISCCPCTL);
/* GPM 0xA000-0xAA84, 0x8000-0x80FC */
s->gfxpause = intel_uncore_read(uncore, GEN6_GFXPAUSE);
s->rpdeuhwtc = intel_uncore_read(uncore, GEN6_RPDEUHWTC);
s->rpdeuc = intel_uncore_read(uncore, GEN6_RPDEUC);
s->ecobus = intel_uncore_read(uncore, ECOBUS);
s->pwrdwnupctl = intel_uncore_read(uncore, VLV_PWRDWNUPCTL);
s->rp_down_timeout = intel_uncore_read(uncore, GEN6_RP_DOWN_TIMEOUT);
s->rp_deucsw = intel_uncore_read(uncore, GEN6_RPDEUCSW);
s->rcubmabdtmr = intel_uncore_read(uncore, GEN6_RCUBMABDTMR);
s->rcedata = intel_uncore_read(uncore, VLV_RCEDATA);
s->spare2gh = intel_uncore_read(uncore, VLV_SPAREG2H);
/* Display CZ domain, 0x4400C-0x4402C, 0x4F000-0x4F11F */
s->gt_imr = intel_uncore_read(uncore, GTIMR);
s->gt_ier = intel_uncore_read(uncore, GTIER);
s->pm_imr = intel_uncore_read(uncore, GEN6_PMIMR);
s->pm_ier = intel_uncore_read(uncore, GEN6_PMIER);
for (i = 0; i < ARRAY_SIZE(s->gt_scratch); i++)
s->gt_scratch[i] = intel_uncore_read(uncore, GEN7_GT_SCRATCH(i));
/* GT SA CZ domain, 0x100000-0x138124 */
s->tilectl = intel_uncore_read(uncore, TILECTL);
s->gt_fifoctl = intel_uncore_read(uncore, GTFIFOCTL);
s->gtlc_wake_ctrl = intel_uncore_read(uncore, VLV_GTLC_WAKE_CTRL);
s->gtlc_survive = intel_uncore_read(uncore, VLV_GTLC_SURVIVABILITY_REG);
s->pmwgicz = intel_uncore_read(uncore, VLV_PMWGICZ);
/* Gunit-Display CZ domain, 0x182028-0x1821CF */
s->gu_ctl0 = intel_uncore_read(uncore, VLV_GU_CTL0);
s->gu_ctl1 = intel_uncore_read(uncore, VLV_GU_CTL1);
s->pcbr = intel_uncore_read(uncore, VLV_PCBR);
s->clock_gate_dis2 = intel_uncore_read(uncore, VLV_GUNIT_CLOCK_GATE2);
/*
* Not saving any of:
* DFT, 0x9800-0x9EC0
* SARB, 0xB000-0xB1FC
* GAC, 0x5208-0x524C, 0x14000-0x14C000
* PCI CFG
*/
}
static void vlv_restore_gunit_s0ix_state(struct drm_i915_private *i915)
{
struct vlv_s0ix_state *s = i915->vlv_s0ix_state;
struct intel_uncore *uncore = &i915->uncore;
int i;
if (!s)
return;
/* GAM 0x4000-0x4770 */
intel_uncore_write(uncore, GEN7_WR_WATERMARK, s->wr_watermark);
intel_uncore_write(uncore, GEN7_GFX_PRIO_CTRL, s->gfx_prio_ctrl);
intel_uncore_write(uncore, ARB_MODE, s->arb_mode | (0xffff << 16));
intel_uncore_write(uncore, GEN7_GFX_PEND_TLB0, s->gfx_pend_tlb0);
intel_uncore_write(uncore, GEN7_GFX_PEND_TLB1, s->gfx_pend_tlb1);
for (i = 0; i < ARRAY_SIZE(s->lra_limits); i++)
intel_uncore_write(uncore, GEN7_LRA_LIMITS(i), s->lra_limits[i]);
intel_uncore_write(uncore, GEN7_MEDIA_MAX_REQ_COUNT, s->media_max_req_count);
intel_uncore_write(uncore, GEN7_GFX_MAX_REQ_COUNT, s->gfx_max_req_count);
intel_uncore_write(uncore, RENDER_HWS_PGA_GEN7, s->render_hwsp);
intel_uncore_write(uncore, GAM_ECOCHK, s->ecochk);
intel_uncore_write(uncore, BSD_HWS_PGA_GEN7, s->bsd_hwsp);
intel_uncore_write(uncore, BLT_HWS_PGA_GEN7, s->blt_hwsp);
intel_uncore_write(uncore, GEN7_TLB_RD_ADDR, s->tlb_rd_addr);
/* MBC 0x9024-0x91D0, 0x8500 */
intel_uncore_write(uncore, VLV_G3DCTL, s->g3dctl);
intel_uncore_write(uncore, VLV_GSCKGCTL, s->gsckgctl);
intel_uncore_write(uncore, GEN6_MBCTL, s->mbctl);
/* GCP 0x9400-0x9424, 0x8100-0x810C */
intel_uncore_write(uncore, GEN6_UCGCTL1, s->ucgctl1);
intel_uncore_write(uncore, GEN6_UCGCTL3, s->ucgctl3);
intel_uncore_write(uncore, GEN6_RCGCTL1, s->rcgctl1);
intel_uncore_write(uncore, GEN6_RCGCTL2, s->rcgctl2);
intel_uncore_write(uncore, GEN6_RSTCTL, s->rstctl);
intel_uncore_write(uncore, GEN7_MISCCPCTL, s->misccpctl);
/* GPM 0xA000-0xAA84, 0x8000-0x80FC */
intel_uncore_write(uncore, GEN6_GFXPAUSE, s->gfxpause);
intel_uncore_write(uncore, GEN6_RPDEUHWTC, s->rpdeuhwtc);
intel_uncore_write(uncore, GEN6_RPDEUC, s->rpdeuc);
intel_uncore_write(uncore, ECOBUS, s->ecobus);
intel_uncore_write(uncore, VLV_PWRDWNUPCTL, s->pwrdwnupctl);
intel_uncore_write(uncore, GEN6_RP_DOWN_TIMEOUT, s->rp_down_timeout);
intel_uncore_write(uncore, GEN6_RPDEUCSW, s->rp_deucsw);
intel_uncore_write(uncore, GEN6_RCUBMABDTMR, s->rcubmabdtmr);
intel_uncore_write(uncore, VLV_RCEDATA, s->rcedata);
intel_uncore_write(uncore, VLV_SPAREG2H, s->spare2gh);
/* Display CZ domain, 0x4400C-0x4402C, 0x4F000-0x4F11F */
intel_uncore_write(uncore, GTIMR, s->gt_imr);
intel_uncore_write(uncore, GTIER, s->gt_ier);
intel_uncore_write(uncore, GEN6_PMIMR, s->pm_imr);
intel_uncore_write(uncore, GEN6_PMIER, s->pm_ier);
for (i = 0; i < ARRAY_SIZE(s->gt_scratch); i++)
intel_uncore_write(uncore, GEN7_GT_SCRATCH(i), s->gt_scratch[i]);
/* GT SA CZ domain, 0x100000-0x138124 */
intel_uncore_write(uncore, TILECTL, s->tilectl);
intel_uncore_write(uncore, GTFIFOCTL, s->gt_fifoctl);
/*
* Preserve the GT allow wake and GFX force clock bit, they are not
* be restored, as they are used to control the s0ix suspend/resume
* sequence by the caller.
*/
intel_uncore_rmw(uncore, VLV_GTLC_WAKE_CTRL, ~VLV_GTLC_ALLOWWAKEREQ,
s->gtlc_wake_ctrl & ~VLV_GTLC_ALLOWWAKEREQ);
intel_uncore_rmw(uncore, VLV_GTLC_SURVIVABILITY_REG, ~VLV_GFX_CLK_FORCE_ON_BIT,
s->gtlc_survive & ~VLV_GFX_CLK_FORCE_ON_BIT);
intel_uncore_write(uncore, VLV_PMWGICZ, s->pmwgicz);
/* Gunit-Display CZ domain, 0x182028-0x1821CF */
intel_uncore_write(uncore, VLV_GU_CTL0, s->gu_ctl0);
intel_uncore_write(uncore, VLV_GU_CTL1, s->gu_ctl1);
intel_uncore_write(uncore, VLV_PCBR, s->pcbr);
intel_uncore_write(uncore, VLV_GUNIT_CLOCK_GATE2, s->clock_gate_dis2);
}
static int vlv_wait_for_pw_status(struct drm_i915_private *i915,
u32 mask, u32 val)
{
i915_reg_t reg = VLV_GTLC_PW_STATUS;
u32 reg_value;
int ret;
/* The HW does not like us polling for PW_STATUS frequently, so
* use the sleeping loop rather than risk the busy spin within
* intel_wait_for_register().
*
* Transitioning between RC6 states should be at most 2ms (see
* valleyview_enable_rps) so use a 3ms timeout.
*/
ret = wait_for(((reg_value =
intel_uncore_read_notrace(&i915->uncore, reg)) & mask)
== val, 3);
/* just trace the final value */
trace_i915_reg_rw(false, reg, reg_value, sizeof(reg_value), true);
return ret;
}
static int vlv_force_gfx_clock(struct drm_i915_private *i915, bool force_on)
{
struct intel_uncore *uncore = &i915->uncore;
int err;
intel_uncore_rmw(uncore, VLV_GTLC_SURVIVABILITY_REG, VLV_GFX_CLK_FORCE_ON_BIT,
force_on ? VLV_GFX_CLK_FORCE_ON_BIT : 0);
if (!force_on)
return 0;
err = intel_wait_for_register(uncore,
VLV_GTLC_SURVIVABILITY_REG,
VLV_GFX_CLK_STATUS_BIT,
VLV_GFX_CLK_STATUS_BIT,
20);
if (err)
drm_err(&i915->drm,
"timeout waiting for GFX clock force-on (%08x)\n",
intel_uncore_read(uncore, VLV_GTLC_SURVIVABILITY_REG));
return err;
}
static int vlv_allow_gt_wake(struct drm_i915_private *i915, bool allow)
{
struct intel_uncore *uncore = &i915->uncore;
u32 mask;
u32 val;
int err;
intel_uncore_rmw(uncore, VLV_GTLC_WAKE_CTRL, VLV_GTLC_ALLOWWAKEREQ,
allow ? VLV_GTLC_ALLOWWAKEREQ : 0);
intel_uncore_posting_read(uncore, VLV_GTLC_WAKE_CTRL);
mask = VLV_GTLC_ALLOWWAKEACK;
val = allow ? mask : 0;
err = vlv_wait_for_pw_status(i915, mask, val);
if (err)
drm_err(&i915->drm, "timeout disabling GT waking\n");
return err;
}
static void vlv_wait_for_gt_wells(struct drm_i915_private *dev_priv,
bool wait_for_on)
{
u32 mask;
u32 val;
mask = VLV_GTLC_PW_MEDIA_STATUS_MASK | VLV_GTLC_PW_RENDER_STATUS_MASK;
val = wait_for_on ? mask : 0;
/*
* RC6 transitioning can be delayed up to 2 msec (see
* valleyview_enable_rps), use 3 msec for safety.
*
* This can fail to turn off the rc6 if the GPU is stuck after a failed
* reset and we are trying to force the machine to sleep.
*/
if (vlv_wait_for_pw_status(dev_priv, mask, val))
drm_dbg(&dev_priv->drm,
"timeout waiting for GT wells to go %s\n",
str_on_off(wait_for_on));
}
static void vlv_check_no_gt_access(struct drm_i915_private *i915)
{
struct intel_uncore *uncore = &i915->uncore;
if (!(intel_uncore_read(uncore, VLV_GTLC_PW_STATUS) & VLV_GTLC_ALLOWWAKEERR))
return;
drm_dbg(&i915->drm, "GT register access while GT waking disabled\n");
intel_uncore_write(uncore, VLV_GTLC_PW_STATUS, VLV_GTLC_ALLOWWAKEERR);
}
int vlv_suspend_complete(struct drm_i915_private *dev_priv)
{
u32 mask;
int err;
if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv))
return 0;
/*
* Bspec defines the following GT well on flags as debug only, so
* don't treat them as hard failures.
*/
vlv_wait_for_gt_wells(dev_priv, false);
mask = VLV_GTLC_RENDER_CTX_EXISTS | VLV_GTLC_MEDIA_CTX_EXISTS;
drm_WARN_ON(&dev_priv->drm,
(intel_uncore_read(&dev_priv->uncore, VLV_GTLC_WAKE_CTRL) & mask) != mask);
vlv_check_no_gt_access(dev_priv);
err = vlv_force_gfx_clock(dev_priv, true);
if (err)
goto err1;
err = vlv_allow_gt_wake(dev_priv, false);
if (err)
goto err2;
vlv_save_gunit_s0ix_state(dev_priv);
err = vlv_force_gfx_clock(dev_priv, false);
if (err)
goto err2;
return 0;
err2:
/* For safety always re-enable waking and disable gfx clock forcing */
vlv_allow_gt_wake(dev_priv, true);
err1:
vlv_force_gfx_clock(dev_priv, false);
return err;
}
int vlv_resume_prepare(struct drm_i915_private *dev_priv, bool rpm_resume)
{
int err;
int ret;
if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv))
return 0;
/*
* If any of the steps fail just try to continue, that's the best we
* can do at this point. Return the first error code (which will also
* leave RPM permanently disabled).
*/
ret = vlv_force_gfx_clock(dev_priv, true);
vlv_restore_gunit_s0ix_state(dev_priv);
err = vlv_allow_gt_wake(dev_priv, true);
if (!ret)
ret = err;
err = vlv_force_gfx_clock(dev_priv, false);
if (!ret)
ret = err;
vlv_check_no_gt_access(dev_priv);
if (rpm_resume)
intel_clock_gating_init(dev_priv);
return ret;
}
int vlv_suspend_init(struct drm_i915_private *i915)
{
if (!IS_VALLEYVIEW(i915))
return 0;
/* we write all the values in the struct, so no need to zero it out */
i915->vlv_s0ix_state = kmalloc(sizeof(*i915->vlv_s0ix_state),
GFP_KERNEL);
if (!i915->vlv_s0ix_state)
return -ENOMEM;
return 0;
}
void vlv_suspend_cleanup(struct drm_i915_private *i915)
{
if (!i915->vlv_s0ix_state)
return;
kfree(i915->vlv_s0ix_state);
i915->vlv_s0ix_state = NULL;
}
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