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linux/drivers/gpu/drm/i915/i915_drv.c

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/* i915_drv.c -- i830,i845,i855,i865,i915 driver -*- linux-c -*-
*/
/*
*
* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include <linux/device.h>
#include <drm/drmP.h>
#include <drm/i915_drm.h>
#include "i915_drv.h"
#include "i915_trace.h"
#include "intel_drv.h"
#include <linux/console.h>
#include <linux/module.h>
#include <drm/drm_crtc_helper.h>
static int i915_modeset __read_mostly = -1;
module_param_named(modeset, i915_modeset, int, 0400);
MODULE_PARM_DESC(modeset,
"Use kernel modesetting [KMS] (0=DRM_I915_KMS from .config, "
"1=on, -1=force vga console preference [default])");
unsigned int i915_fbpercrtc __always_unused = 0;
module_param_named(fbpercrtc, i915_fbpercrtc, int, 0400);
int i915_panel_ignore_lid __read_mostly = 1;
module_param_named(panel_ignore_lid, i915_panel_ignore_lid, int, 0600);
MODULE_PARM_DESC(panel_ignore_lid,
"Override lid status (0=autodetect, 1=autodetect disabled [default], "
"-1=force lid closed, -2=force lid open)");
unsigned int i915_powersave __read_mostly = 1;
module_param_named(powersave, i915_powersave, int, 0600);
MODULE_PARM_DESC(powersave,
"Enable powersavings, fbc, downclocking, etc. (default: true)");
int i915_semaphores __read_mostly = -1;
module_param_named(semaphores, i915_semaphores, int, 0600);
MODULE_PARM_DESC(semaphores,
"Use semaphores for inter-ring sync (default: -1 (use per-chip defaults))");
int i915_enable_rc6 __read_mostly = -1;
module_param_named(i915_enable_rc6, i915_enable_rc6, int, 0400);
MODULE_PARM_DESC(i915_enable_rc6,
"Enable power-saving render C-state 6. "
"Different stages can be selected via bitmask values "
"(0 = disable; 1 = enable rc6; 2 = enable deep rc6; 4 = enable deepest rc6). "
"For example, 3 would enable rc6 and deep rc6, and 7 would enable everything. "
"default: -1 (use per-chip default)");
int i915_enable_fbc __read_mostly = -1;
module_param_named(i915_enable_fbc, i915_enable_fbc, int, 0600);
MODULE_PARM_DESC(i915_enable_fbc,
"Enable frame buffer compression for power savings "
"(default: -1 (use per-chip default))");
unsigned int i915_lvds_downclock __read_mostly = 0;
module_param_named(lvds_downclock, i915_lvds_downclock, int, 0400);
MODULE_PARM_DESC(lvds_downclock,
"Use panel (LVDS/eDP) downclocking for power savings "
"(default: false)");
int i915_lvds_channel_mode __read_mostly;
module_param_named(lvds_channel_mode, i915_lvds_channel_mode, int, 0600);
MODULE_PARM_DESC(lvds_channel_mode,
"Specify LVDS channel mode "
"(0=probe BIOS [default], 1=single-channel, 2=dual-channel)");
int i915_panel_use_ssc __read_mostly = -1;
module_param_named(lvds_use_ssc, i915_panel_use_ssc, int, 0600);
MODULE_PARM_DESC(lvds_use_ssc,
"Use Spread Spectrum Clock with panels [LVDS/eDP] "
"(default: auto from VBT)");
int i915_vbt_sdvo_panel_type __read_mostly = -1;
module_param_named(vbt_sdvo_panel_type, i915_vbt_sdvo_panel_type, int, 0600);
MODULE_PARM_DESC(vbt_sdvo_panel_type,
"Override/Ignore selection of SDVO panel mode in the VBT "
"(-2=ignore, -1=auto [default], index in VBT BIOS table)");
static bool i915_try_reset __read_mostly = true;
module_param_named(reset, i915_try_reset, bool, 0600);
MODULE_PARM_DESC(reset, "Attempt GPU resets (default: true)");
bool i915_enable_hangcheck __read_mostly = true;
module_param_named(enable_hangcheck, i915_enable_hangcheck, bool, 0644);
MODULE_PARM_DESC(enable_hangcheck,
"Periodically check GPU activity for detecting hangs. "
"WARNING: Disabling this can cause system wide hangs. "
"(default: true)");
int i915_enable_ppgtt __read_mostly = -1;
module_param_named(i915_enable_ppgtt, i915_enable_ppgtt, int, 0600);
MODULE_PARM_DESC(i915_enable_ppgtt,
"Enable PPGTT (default: true)");
unsigned int i915_preliminary_hw_support __read_mostly = 0;
module_param_named(preliminary_hw_support, i915_preliminary_hw_support, int, 0600);
MODULE_PARM_DESC(preliminary_hw_support,
"Enable preliminary hardware support. "
"Enable Haswell and ValleyView Support. "
"(default: false)");
static struct drm_driver driver;
extern int intel_agp_enabled;
#define INTEL_VGA_DEVICE(id, info) { \
.class = PCI_BASE_CLASS_DISPLAY << 16, \
.class_mask = 0xff0000, \
.vendor = 0x8086, \
.device = id, \
.subvendor = PCI_ANY_ID, \
.subdevice = PCI_ANY_ID, \
.driver_data = (unsigned long) info }
static const struct intel_device_info intel_i830_info = {
.gen = 2, .is_mobile = 1, .cursor_needs_physical = 1,
.has_overlay = 1, .overlay_needs_physical = 1,
};
static const struct intel_device_info intel_845g_info = {
.gen = 2,
.has_overlay = 1, .overlay_needs_physical = 1,
};
static const struct intel_device_info intel_i85x_info = {
.gen = 2, .is_i85x = 1, .is_mobile = 1,
.cursor_needs_physical = 1,
.has_overlay = 1, .overlay_needs_physical = 1,
};
static const struct intel_device_info intel_i865g_info = {
.gen = 2,
.has_overlay = 1, .overlay_needs_physical = 1,
};
static const struct intel_device_info intel_i915g_info = {
.gen = 3, .is_i915g = 1, .cursor_needs_physical = 1,
.has_overlay = 1, .overlay_needs_physical = 1,
};
static const struct intel_device_info intel_i915gm_info = {
.gen = 3, .is_mobile = 1,
.cursor_needs_physical = 1,
.has_overlay = 1, .overlay_needs_physical = 1,
.supports_tv = 1,
};
static const struct intel_device_info intel_i945g_info = {
.gen = 3, .has_hotplug = 1, .cursor_needs_physical = 1,
.has_overlay = 1, .overlay_needs_physical = 1,
};
static const struct intel_device_info intel_i945gm_info = {
.gen = 3, .is_i945gm = 1, .is_mobile = 1,
.has_hotplug = 1, .cursor_needs_physical = 1,
.has_overlay = 1, .overlay_needs_physical = 1,
.supports_tv = 1,
};
static const struct intel_device_info intel_i965g_info = {
.gen = 4, .is_broadwater = 1,
.has_hotplug = 1,
.has_overlay = 1,
};
static const struct intel_device_info intel_i965gm_info = {
.gen = 4, .is_crestline = 1,
.is_mobile = 1, .has_fbc = 1, .has_hotplug = 1,
.has_overlay = 1,
.supports_tv = 1,
};
static const struct intel_device_info intel_g33_info = {
.gen = 3, .is_g33 = 1,
.need_gfx_hws = 1, .has_hotplug = 1,
.has_overlay = 1,
};
static const struct intel_device_info intel_g45_info = {
.gen = 4, .is_g4x = 1, .need_gfx_hws = 1,
.has_pipe_cxsr = 1, .has_hotplug = 1,
.has_bsd_ring = 1,
};
static const struct intel_device_info intel_gm45_info = {
.gen = 4, .is_g4x = 1,
.is_mobile = 1, .need_gfx_hws = 1, .has_fbc = 1,
.has_pipe_cxsr = 1, .has_hotplug = 1,
.supports_tv = 1,
.has_bsd_ring = 1,
};
static const struct intel_device_info intel_pineview_info = {
.gen = 3, .is_g33 = 1, .is_pineview = 1, .is_mobile = 1,
.need_gfx_hws = 1, .has_hotplug = 1,
.has_overlay = 1,
};
static const struct intel_device_info intel_ironlake_d_info = {
.gen = 5,
.need_gfx_hws = 1, .has_hotplug = 1,
.has_bsd_ring = 1,
};
static const struct intel_device_info intel_ironlake_m_info = {
.gen = 5, .is_mobile = 1,
.need_gfx_hws = 1, .has_hotplug = 1,
.has_fbc = 1,
.has_bsd_ring = 1,
};
static const struct intel_device_info intel_sandybridge_d_info = {
.gen = 6,
.need_gfx_hws = 1, .has_hotplug = 1,
.has_bsd_ring = 1,
.has_blt_ring = 1,
.has_llc = 1,
.has_force_wake = 1,
};
static const struct intel_device_info intel_sandybridge_m_info = {
.gen = 6, .is_mobile = 1,
.need_gfx_hws = 1, .has_hotplug = 1,
.has_fbc = 1,
.has_bsd_ring = 1,
.has_blt_ring = 1,
.has_llc = 1,
.has_force_wake = 1,
};
static const struct intel_device_info intel_ivybridge_d_info = {
.is_ivybridge = 1, .gen = 7,
.need_gfx_hws = 1, .has_hotplug = 1,
.has_bsd_ring = 1,
.has_blt_ring = 1,
.has_llc = 1,
.has_force_wake = 1,
};
static const struct intel_device_info intel_ivybridge_m_info = {
.is_ivybridge = 1, .gen = 7, .is_mobile = 1,
.need_gfx_hws = 1, .has_hotplug = 1,
.has_fbc = 0, /* FBC is not enabled on Ivybridge mobile yet */
.has_bsd_ring = 1,
.has_blt_ring = 1,
.has_llc = 1,
.has_force_wake = 1,
};
static const struct intel_device_info intel_valleyview_m_info = {
.gen = 7, .is_mobile = 1,
.need_gfx_hws = 1, .has_hotplug = 1,
.has_fbc = 0,
.has_bsd_ring = 1,
.has_blt_ring = 1,
.is_valleyview = 1,
};
static const struct intel_device_info intel_valleyview_d_info = {
.gen = 7,
.need_gfx_hws = 1, .has_hotplug = 1,
.has_fbc = 0,
.has_bsd_ring = 1,
.has_blt_ring = 1,
.is_valleyview = 1,
};
static const struct intel_device_info intel_haswell_d_info = {
.is_haswell = 1, .gen = 7,
.need_gfx_hws = 1, .has_hotplug = 1,
.has_bsd_ring = 1,
.has_blt_ring = 1,
.has_llc = 1,
.has_force_wake = 1,
};
static const struct intel_device_info intel_haswell_m_info = {
.is_haswell = 1, .gen = 7, .is_mobile = 1,
.need_gfx_hws = 1, .has_hotplug = 1,
.has_bsd_ring = 1,
.has_blt_ring = 1,
.has_llc = 1,
.has_force_wake = 1,
};
static const struct pci_device_id pciidlist[] = { /* aka */
INTEL_VGA_DEVICE(0x3577, &intel_i830_info), /* I830_M */
INTEL_VGA_DEVICE(0x2562, &intel_845g_info), /* 845_G */
INTEL_VGA_DEVICE(0x3582, &intel_i85x_info), /* I855_GM */
INTEL_VGA_DEVICE(0x358e, &intel_i85x_info),
INTEL_VGA_DEVICE(0x2572, &intel_i865g_info), /* I865_G */
INTEL_VGA_DEVICE(0x2582, &intel_i915g_info), /* I915_G */
INTEL_VGA_DEVICE(0x258a, &intel_i915g_info), /* E7221_G */
INTEL_VGA_DEVICE(0x2592, &intel_i915gm_info), /* I915_GM */
INTEL_VGA_DEVICE(0x2772, &intel_i945g_info), /* I945_G */
INTEL_VGA_DEVICE(0x27a2, &intel_i945gm_info), /* I945_GM */
INTEL_VGA_DEVICE(0x27ae, &intel_i945gm_info), /* I945_GME */
INTEL_VGA_DEVICE(0x2972, &intel_i965g_info), /* I946_GZ */
INTEL_VGA_DEVICE(0x2982, &intel_i965g_info), /* G35_G */
INTEL_VGA_DEVICE(0x2992, &intel_i965g_info), /* I965_Q */
INTEL_VGA_DEVICE(0x29a2, &intel_i965g_info), /* I965_G */
INTEL_VGA_DEVICE(0x29b2, &intel_g33_info), /* Q35_G */
INTEL_VGA_DEVICE(0x29c2, &intel_g33_info), /* G33_G */
INTEL_VGA_DEVICE(0x29d2, &intel_g33_info), /* Q33_G */
INTEL_VGA_DEVICE(0x2a02, &intel_i965gm_info), /* I965_GM */
INTEL_VGA_DEVICE(0x2a12, &intel_i965gm_info), /* I965_GME */
INTEL_VGA_DEVICE(0x2a42, &intel_gm45_info), /* GM45_G */
INTEL_VGA_DEVICE(0x2e02, &intel_g45_info), /* IGD_E_G */
INTEL_VGA_DEVICE(0x2e12, &intel_g45_info), /* Q45_G */
INTEL_VGA_DEVICE(0x2e22, &intel_g45_info), /* G45_G */
INTEL_VGA_DEVICE(0x2e32, &intel_g45_info), /* G41_G */
INTEL_VGA_DEVICE(0x2e42, &intel_g45_info), /* B43_G */
INTEL_VGA_DEVICE(0x2e92, &intel_g45_info), /* B43_G.1 */
INTEL_VGA_DEVICE(0xa001, &intel_pineview_info),
INTEL_VGA_DEVICE(0xa011, &intel_pineview_info),
INTEL_VGA_DEVICE(0x0042, &intel_ironlake_d_info),
INTEL_VGA_DEVICE(0x0046, &intel_ironlake_m_info),
INTEL_VGA_DEVICE(0x0102, &intel_sandybridge_d_info),
INTEL_VGA_DEVICE(0x0112, &intel_sandybridge_d_info),
INTEL_VGA_DEVICE(0x0122, &intel_sandybridge_d_info),
INTEL_VGA_DEVICE(0x0106, &intel_sandybridge_m_info),
INTEL_VGA_DEVICE(0x0116, &intel_sandybridge_m_info),
INTEL_VGA_DEVICE(0x0126, &intel_sandybridge_m_info),
INTEL_VGA_DEVICE(0x010A, &intel_sandybridge_d_info),
INTEL_VGA_DEVICE(0x0156, &intel_ivybridge_m_info), /* GT1 mobile */
INTEL_VGA_DEVICE(0x0166, &intel_ivybridge_m_info), /* GT2 mobile */
INTEL_VGA_DEVICE(0x0152, &intel_ivybridge_d_info), /* GT1 desktop */
INTEL_VGA_DEVICE(0x0162, &intel_ivybridge_d_info), /* GT2 desktop */
INTEL_VGA_DEVICE(0x015a, &intel_ivybridge_d_info), /* GT1 server */
INTEL_VGA_DEVICE(0x016a, &intel_ivybridge_d_info), /* GT2 server */
INTEL_VGA_DEVICE(0x0402, &intel_haswell_d_info), /* GT1 desktop */
INTEL_VGA_DEVICE(0x0412, &intel_haswell_d_info), /* GT2 desktop */
INTEL_VGA_DEVICE(0x0422, &intel_haswell_d_info), /* GT2 desktop */
INTEL_VGA_DEVICE(0x040a, &intel_haswell_d_info), /* GT1 server */
INTEL_VGA_DEVICE(0x041a, &intel_haswell_d_info), /* GT2 server */
INTEL_VGA_DEVICE(0x042a, &intel_haswell_d_info), /* GT2 server */
INTEL_VGA_DEVICE(0x0406, &intel_haswell_m_info), /* GT1 mobile */
INTEL_VGA_DEVICE(0x0416, &intel_haswell_m_info), /* GT2 mobile */
INTEL_VGA_DEVICE(0x0426, &intel_haswell_m_info), /* GT2 mobile */
INTEL_VGA_DEVICE(0x0C02, &intel_haswell_d_info), /* SDV GT1 desktop */
INTEL_VGA_DEVICE(0x0C12, &intel_haswell_d_info), /* SDV GT2 desktop */
INTEL_VGA_DEVICE(0x0C22, &intel_haswell_d_info), /* SDV GT2 desktop */
INTEL_VGA_DEVICE(0x0C0A, &intel_haswell_d_info), /* SDV GT1 server */
INTEL_VGA_DEVICE(0x0C1A, &intel_haswell_d_info), /* SDV GT2 server */
INTEL_VGA_DEVICE(0x0C2A, &intel_haswell_d_info), /* SDV GT2 server */
INTEL_VGA_DEVICE(0x0C06, &intel_haswell_m_info), /* SDV GT1 mobile */
INTEL_VGA_DEVICE(0x0C16, &intel_haswell_m_info), /* SDV GT2 mobile */
INTEL_VGA_DEVICE(0x0C26, &intel_haswell_m_info), /* SDV GT2 mobile */
INTEL_VGA_DEVICE(0x0A02, &intel_haswell_d_info), /* ULT GT1 desktop */
INTEL_VGA_DEVICE(0x0A12, &intel_haswell_d_info), /* ULT GT2 desktop */
INTEL_VGA_DEVICE(0x0A22, &intel_haswell_d_info), /* ULT GT2 desktop */
INTEL_VGA_DEVICE(0x0A0A, &intel_haswell_d_info), /* ULT GT1 server */
INTEL_VGA_DEVICE(0x0A1A, &intel_haswell_d_info), /* ULT GT2 server */
INTEL_VGA_DEVICE(0x0A2A, &intel_haswell_d_info), /* ULT GT2 server */
INTEL_VGA_DEVICE(0x0A06, &intel_haswell_m_info), /* ULT GT1 mobile */
INTEL_VGA_DEVICE(0x0A16, &intel_haswell_m_info), /* ULT GT2 mobile */
INTEL_VGA_DEVICE(0x0A26, &intel_haswell_m_info), /* ULT GT2 mobile */
INTEL_VGA_DEVICE(0x0D12, &intel_haswell_d_info), /* CRW GT1 desktop */
INTEL_VGA_DEVICE(0x0D22, &intel_haswell_d_info), /* CRW GT2 desktop */
INTEL_VGA_DEVICE(0x0D32, &intel_haswell_d_info), /* CRW GT2 desktop */
INTEL_VGA_DEVICE(0x0D1A, &intel_haswell_d_info), /* CRW GT1 server */
INTEL_VGA_DEVICE(0x0D2A, &intel_haswell_d_info), /* CRW GT2 server */
INTEL_VGA_DEVICE(0x0D3A, &intel_haswell_d_info), /* CRW GT2 server */
INTEL_VGA_DEVICE(0x0D16, &intel_haswell_m_info), /* CRW GT1 mobile */
INTEL_VGA_DEVICE(0x0D26, &intel_haswell_m_info), /* CRW GT2 mobile */
INTEL_VGA_DEVICE(0x0D36, &intel_haswell_m_info), /* CRW GT2 mobile */
INTEL_VGA_DEVICE(0x0f30, &intel_valleyview_m_info),
INTEL_VGA_DEVICE(0x0157, &intel_valleyview_m_info),
INTEL_VGA_DEVICE(0x0155, &intel_valleyview_d_info),
{0, 0, 0}
};
#if defined(CONFIG_DRM_I915_KMS)
MODULE_DEVICE_TABLE(pci, pciidlist);
#endif
void intel_detect_pch(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct pci_dev *pch;
/*
* The reason to probe ISA bridge instead of Dev31:Fun0 is to
* make graphics device passthrough work easy for VMM, that only
* need to expose ISA bridge to let driver know the real hardware
* underneath. This is a requirement from virtualization team.
*/
pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL);
if (pch) {
if (pch->vendor == PCI_VENDOR_ID_INTEL) {
unsigned short id;
id = pch->device & INTEL_PCH_DEVICE_ID_MASK;
dev_priv->pch_id = id;
if (id == INTEL_PCH_IBX_DEVICE_ID_TYPE) {
dev_priv->pch_type = PCH_IBX;
dev_priv->num_pch_pll = 2;
DRM_DEBUG_KMS("Found Ibex Peak PCH\n");
WARN_ON(!IS_GEN5(dev));
} else if (id == INTEL_PCH_CPT_DEVICE_ID_TYPE) {
dev_priv->pch_type = PCH_CPT;
dev_priv->num_pch_pll = 2;
DRM_DEBUG_KMS("Found CougarPoint PCH\n");
WARN_ON(!(IS_GEN6(dev) || IS_IVYBRIDGE(dev)));
} else if (id == INTEL_PCH_PPT_DEVICE_ID_TYPE) {
/* PantherPoint is CPT compatible */
dev_priv->pch_type = PCH_CPT;
dev_priv->num_pch_pll = 2;
DRM_DEBUG_KMS("Found PatherPoint PCH\n");
WARN_ON(!(IS_GEN6(dev) || IS_IVYBRIDGE(dev)));
} else if (id == INTEL_PCH_LPT_DEVICE_ID_TYPE) {
dev_priv->pch_type = PCH_LPT;
dev_priv->num_pch_pll = 0;
DRM_DEBUG_KMS("Found LynxPoint PCH\n");
WARN_ON(!IS_HASWELL(dev));
} else if (id == INTEL_PCH_LPT_LP_DEVICE_ID_TYPE) {
dev_priv->pch_type = PCH_LPT;
dev_priv->num_pch_pll = 0;
DRM_DEBUG_KMS("Found LynxPoint LP PCH\n");
WARN_ON(!IS_HASWELL(dev));
}
BUG_ON(dev_priv->num_pch_pll > I915_NUM_PLLS);
}
pci_dev_put(pch);
}
}
bool i915_semaphore_is_enabled(struct drm_device *dev)
{
if (INTEL_INFO(dev)->gen < 6)
return 0;
if (i915_semaphores >= 0)
return i915_semaphores;
#ifdef CONFIG_INTEL_IOMMU
/* Enable semaphores on SNB when IO remapping is off */
if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped)
return false;
#endif
return 1;
}
static int i915_drm_freeze(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
drm_kms_helper_poll_disable(dev);
pci_save_state(dev->pdev);
/* If KMS is active, we do the leavevt stuff here */
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
int error = i915_gem_idle(dev);
if (error) {
dev_err(&dev->pdev->dev,
"GEM idle failed, resume might fail\n");
return error;
}
cancel_delayed_work_sync(&dev_priv->rps.delayed_resume_work);
intel_modeset_disable(dev);
drm_irq_uninstall(dev);
}
i915_save_state(dev);
intel_opregion_fini(dev);
/* Modeset on resume, not lid events */
dev_priv->modeset_on_lid = 0;
console_lock();
intel_fbdev_set_suspend(dev, 1);
console_unlock();
return 0;
}
int i915_suspend(struct drm_device *dev, pm_message_t state)
{
int error;
if (!dev || !dev->dev_private) {
DRM_ERROR("dev: %p\n", dev);
DRM_ERROR("DRM not initialized, aborting suspend.\n");
return -ENODEV;
}
if (state.event == PM_EVENT_PRETHAW)
return 0;
if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
return 0;
error = i915_drm_freeze(dev);
if (error)
return error;
if (state.event == PM_EVENT_SUSPEND) {
/* Shut down the device */
pci_disable_device(dev->pdev);
pci_set_power_state(dev->pdev, PCI_D3hot);
}
return 0;
}
void intel_console_resume(struct work_struct *work)
{
struct drm_i915_private *dev_priv =
container_of(work, struct drm_i915_private,
console_resume_work);
struct drm_device *dev = dev_priv->dev;
console_lock();
intel_fbdev_set_suspend(dev, 0);
console_unlock();
}
static int __i915_drm_thaw(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int error = 0;
i915_restore_state(dev);
intel_opregion_setup(dev);
/* KMS EnterVT equivalent */
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
ironlake_init_pch_refclk(dev);
mutex_lock(&dev->struct_mutex);
dev_priv->mm.suspended = 0;
error = i915_gem_init_hw(dev);
mutex_unlock(&dev->struct_mutex);
intel_modeset_init_hw(dev);
intel_modeset_setup_hw_state(dev);
drm_irq_install(dev);
}
intel_opregion_init(dev);
dev_priv->modeset_on_lid = 0;
/*
* The console lock can be pretty contented on resume due
* to all the printk activity. Try to keep it out of the hot
* path of resume if possible.
*/
if (console_trylock()) {
intel_fbdev_set_suspend(dev, 0);
console_unlock();
} else {
schedule_work(&dev_priv->console_resume_work);
}
return error;
}
static int i915_drm_thaw(struct drm_device *dev)
{
int error = 0;
intel_gt_reset(dev);
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
mutex_lock(&dev->struct_mutex);
i915_gem_restore_gtt_mappings(dev);
mutex_unlock(&dev->struct_mutex);
}
__i915_drm_thaw(dev);
return error;
}
int i915_resume(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
return 0;
if (pci_enable_device(dev->pdev))
return -EIO;
pci_set_master(dev->pdev);
intel_gt_reset(dev);
/*
* Platforms with opregion should have sane BIOS, older ones (gen3 and
* earlier) need this since the BIOS might clear all our scratch PTEs.
*/
if (drm_core_check_feature(dev, DRIVER_MODESET) &&
!dev_priv->opregion.header) {
mutex_lock(&dev->struct_mutex);
i915_gem_restore_gtt_mappings(dev);
mutex_unlock(&dev->struct_mutex);
}
ret = __i915_drm_thaw(dev);
if (ret)
return ret;
drm_kms_helper_poll_enable(dev);
return 0;
}
static int i8xx_do_reset(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
if (IS_I85X(dev))
return -ENODEV;
I915_WRITE(D_STATE, I915_READ(D_STATE) | DSTATE_GFX_RESET_I830);
POSTING_READ(D_STATE);
if (IS_I830(dev) || IS_845G(dev)) {
I915_WRITE(DEBUG_RESET_I830,
DEBUG_RESET_DISPLAY |
DEBUG_RESET_RENDER |
DEBUG_RESET_FULL);
POSTING_READ(DEBUG_RESET_I830);
msleep(1);
I915_WRITE(DEBUG_RESET_I830, 0);
POSTING_READ(DEBUG_RESET_I830);
}
msleep(1);
I915_WRITE(D_STATE, I915_READ(D_STATE) & ~DSTATE_GFX_RESET_I830);
POSTING_READ(D_STATE);
return 0;
}
static int i965_reset_complete(struct drm_device *dev)
{
u8 gdrst;
pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst);
return (gdrst & GRDOM_RESET_ENABLE) == 0;
}
static int i965_do_reset(struct drm_device *dev)
{
int ret;
u8 gdrst;
/*
* Set the domains we want to reset (GRDOM/bits 2 and 3) as
* well as the reset bit (GR/bit 0). Setting the GR bit
* triggers the reset; when done, the hardware will clear it.
*/
pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst);
pci_write_config_byte(dev->pdev, I965_GDRST,
gdrst | GRDOM_RENDER |
GRDOM_RESET_ENABLE);
ret = wait_for(i965_reset_complete(dev), 500);
if (ret)
return ret;
/* We can't reset render&media without also resetting display ... */
pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst);
pci_write_config_byte(dev->pdev, I965_GDRST,
gdrst | GRDOM_MEDIA |
GRDOM_RESET_ENABLE);
return wait_for(i965_reset_complete(dev), 500);
}
static int ironlake_do_reset(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u32 gdrst;
int ret;
gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
gdrst | GRDOM_RENDER | GRDOM_RESET_ENABLE);
ret = wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
if (ret)
return ret;
/* We can't reset render&media without also resetting display ... */
gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
gdrst | GRDOM_MEDIA | GRDOM_RESET_ENABLE);
return wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
}
static int gen6_do_reset(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
unsigned long irqflags;
/* Hold gt_lock across reset to prevent any register access
* with forcewake not set correctly
*/
spin_lock_irqsave(&dev_priv->gt_lock, irqflags);
/* Reset the chip */
/* GEN6_GDRST is not in the gt power well, no need to check
* for fifo space for the write or forcewake the chip for
* the read
*/
I915_WRITE_NOTRACE(GEN6_GDRST, GEN6_GRDOM_FULL);
/* Spin waiting for the device to ack the reset request */
ret = wait_for((I915_READ_NOTRACE(GEN6_GDRST) & GEN6_GRDOM_FULL) == 0, 500);
/* If reset with a user forcewake, try to restore, otherwise turn it off */
if (dev_priv->forcewake_count)
dev_priv->gt.force_wake_get(dev_priv);
else
dev_priv->gt.force_wake_put(dev_priv);
/* Restore fifo count */
dev_priv->gt_fifo_count = I915_READ_NOTRACE(GT_FIFO_FREE_ENTRIES);
spin_unlock_irqrestore(&dev_priv->gt_lock, irqflags);
return ret;
}
int intel_gpu_reset(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int ret = -ENODEV;
switch (INTEL_INFO(dev)->gen) {
case 7:
case 6:
ret = gen6_do_reset(dev);
break;
case 5:
ret = ironlake_do_reset(dev);
break;
case 4:
ret = i965_do_reset(dev);
break;
case 2:
ret = i8xx_do_reset(dev);
break;
}
/* Also reset the gpu hangman. */
if (dev_priv->stop_rings) {
DRM_DEBUG("Simulated gpu hang, resetting stop_rings\n");
dev_priv->stop_rings = 0;
if (ret == -ENODEV) {
DRM_ERROR("Reset not implemented, but ignoring "
"error for simulated gpu hangs\n");
ret = 0;
}
}
return ret;
}
/**
* i915_reset - reset chip after a hang
* @dev: drm device to reset
*
* Reset the chip. Useful if a hang is detected. Returns zero on successful
* reset or otherwise an error code.
*
* Procedure is fairly simple:
* - reset the chip using the reset reg
* - re-init context state
* - re-init hardware status page
* - re-init ring buffer
* - re-init interrupt state
* - re-init display
*/
int i915_reset(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
int ret;
if (!i915_try_reset)
return 0;
mutex_lock(&dev->struct_mutex);
i915_gem_reset(dev);
ret = -ENODEV;
if (get_seconds() - dev_priv->last_gpu_reset < 5)
DRM_ERROR("GPU hanging too fast, declaring wedged!\n");
else
ret = intel_gpu_reset(dev);
dev_priv->last_gpu_reset = get_seconds();
if (ret) {
DRM_ERROR("Failed to reset chip.\n");
mutex_unlock(&dev->struct_mutex);
return ret;
}
/* Ok, now get things going again... */
/*
* Everything depends on having the GTT running, so we need to start
* there. Fortunately we don't need to do this unless we reset the
* chip at a PCI level.
*
* Next we need to restore the context, but we don't use those
* yet either...
*
* Ring buffer needs to be re-initialized in the KMS case, or if X
* was running at the time of the reset (i.e. we weren't VT
* switched away).
*/
if (drm_core_check_feature(dev, DRIVER_MODESET) ||
!dev_priv->mm.suspended) {
struct intel_ring_buffer *ring;
int i;
dev_priv->mm.suspended = 0;
i915_gem_init_swizzling(dev);
for_each_ring(ring, dev_priv, i)
ring->init(ring);
i915_gem_context_init(dev);
i915_gem_init_ppgtt(dev);
/*
* It would make sense to re-init all the other hw state, at
* least the rps/rc6/emon init done within modeset_init_hw. For
* some unknown reason, this blows up my ilk, so don't.
*/
mutex_unlock(&dev->struct_mutex);
drm_irq_uninstall(dev);
drm_irq_install(dev);
} else {
mutex_unlock(&dev->struct_mutex);
}
return 0;
}
static int __devinit
i915_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
struct intel_device_info *intel_info =
(struct intel_device_info *) ent->driver_data;
if (intel_info->is_haswell || intel_info->is_valleyview)
if(!i915_preliminary_hw_support) {
DRM_ERROR("Preliminary hardware support disabled\n");
return -ENODEV;
}
/* Only bind to function 0 of the device. Early generations
* used function 1 as a placeholder for multi-head. This causes
* us confusion instead, especially on the systems where both
* functions have the same PCI-ID!
*/
if (PCI_FUNC(pdev->devfn))
return -ENODEV;
/* We've managed to ship a kms-enabled ddx that shipped with an XvMC
* implementation for gen3 (and only gen3) that used legacy drm maps
* (gasp!) to share buffers between X and the client. Hence we need to
* keep around the fake agp stuff for gen3, even when kms is enabled. */
if (intel_info->gen != 3) {
driver.driver_features &=
~(DRIVER_USE_AGP | DRIVER_REQUIRE_AGP);
} else if (!intel_agp_enabled) {
DRM_ERROR("drm/i915 can't work without intel_agp module!\n");
return -ENODEV;
}
return drm_get_pci_dev(pdev, ent, &driver);
}
static void
i915_pci_remove(struct pci_dev *pdev)
{
struct drm_device *dev = pci_get_drvdata(pdev);
drm_put_dev(dev);
}
static int i915_pm_suspend(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct drm_device *drm_dev = pci_get_drvdata(pdev);
int error;
if (!drm_dev || !drm_dev->dev_private) {
dev_err(dev, "DRM not initialized, aborting suspend.\n");
return -ENODEV;
}
if (drm_dev->switch_power_state == DRM_SWITCH_POWER_OFF)
return 0;
error = i915_drm_freeze(drm_dev);
if (error)
return error;
pci_disable_device(pdev);
pci_set_power_state(pdev, PCI_D3hot);
return 0;
}
static int i915_pm_resume(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct drm_device *drm_dev = pci_get_drvdata(pdev);
return i915_resume(drm_dev);
}
static int i915_pm_freeze(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct drm_device *drm_dev = pci_get_drvdata(pdev);
if (!drm_dev || !drm_dev->dev_private) {
dev_err(dev, "DRM not initialized, aborting suspend.\n");
return -ENODEV;
}
return i915_drm_freeze(drm_dev);
}
static int i915_pm_thaw(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct drm_device *drm_dev = pci_get_drvdata(pdev);
return i915_drm_thaw(drm_dev);
}
static int i915_pm_poweroff(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct drm_device *drm_dev = pci_get_drvdata(pdev);
return i915_drm_freeze(drm_dev);
}
static const struct dev_pm_ops i915_pm_ops = {
.suspend = i915_pm_suspend,
.resume = i915_pm_resume,
.freeze = i915_pm_freeze,
.thaw = i915_pm_thaw,
.poweroff = i915_pm_poweroff,
.restore = i915_pm_resume,
};
static const struct vm_operations_struct i915_gem_vm_ops = {
.fault = i915_gem_fault,
.open = drm_gem_vm_open,
.close = drm_gem_vm_close,
};
static const struct file_operations i915_driver_fops = {
.owner = THIS_MODULE,
.open = drm_open,
.release = drm_release,
.unlocked_ioctl = drm_ioctl,
.mmap = drm_gem_mmap,
.poll = drm_poll,
.fasync = drm_fasync,
.read = drm_read,
#ifdef CONFIG_COMPAT
.compat_ioctl = i915_compat_ioctl,
#endif
.llseek = noop_llseek,
};
static struct drm_driver driver = {
/* Don't use MTRRs here; the Xserver or userspace app should
* deal with them for Intel hardware.
*/
.driver_features =
DRIVER_USE_AGP | DRIVER_REQUIRE_AGP | /* DRIVER_USE_MTRR |*/
DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED | DRIVER_GEM | DRIVER_PRIME,
.load = i915_driver_load,
.unload = i915_driver_unload,
.open = i915_driver_open,
.lastclose = i915_driver_lastclose,
.preclose = i915_driver_preclose,
.postclose = i915_driver_postclose,
/* Used in place of i915_pm_ops for non-DRIVER_MODESET */
.suspend = i915_suspend,
.resume = i915_resume,
.device_is_agp = i915_driver_device_is_agp,
.master_create = i915_master_create,
.master_destroy = i915_master_destroy,
#if defined(CONFIG_DEBUG_FS)
.debugfs_init = i915_debugfs_init,
.debugfs_cleanup = i915_debugfs_cleanup,
#endif
.gem_init_object = i915_gem_init_object,
.gem_free_object = i915_gem_free_object,
.gem_vm_ops = &i915_gem_vm_ops,
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_prime_export = i915_gem_prime_export,
.gem_prime_import = i915_gem_prime_import,
.dumb_create = i915_gem_dumb_create,
.dumb_map_offset = i915_gem_mmap_gtt,
.dumb_destroy = i915_gem_dumb_destroy,
.ioctls = i915_ioctls,
.fops = &i915_driver_fops,
.name = DRIVER_NAME,
.desc = DRIVER_DESC,
.date = DRIVER_DATE,
.major = DRIVER_MAJOR,
.minor = DRIVER_MINOR,
.patchlevel = DRIVER_PATCHLEVEL,
};
static struct pci_driver i915_pci_driver = {
.name = DRIVER_NAME,
.id_table = pciidlist,
.probe = i915_pci_probe,
.remove = i915_pci_remove,
.driver.pm = &i915_pm_ops,
};
static int __init i915_init(void)
{
driver.num_ioctls = i915_max_ioctl;
/*
* If CONFIG_DRM_I915_KMS is set, default to KMS unless
* explicitly disabled with the module pararmeter.
*
* Otherwise, just follow the parameter (defaulting to off).
*
* Allow optional vga_text_mode_force boot option to override
* the default behavior.
*/
#if defined(CONFIG_DRM_I915_KMS)
if (i915_modeset != 0)
driver.driver_features |= DRIVER_MODESET;
#endif
if (i915_modeset == 1)
driver.driver_features |= DRIVER_MODESET;
#ifdef CONFIG_VGA_CONSOLE
if (vgacon_text_force() && i915_modeset == -1)
driver.driver_features &= ~DRIVER_MODESET;
#endif
if (!(driver.driver_features & DRIVER_MODESET))
driver.get_vblank_timestamp = NULL;
return drm_pci_init(&driver, &i915_pci_driver);
}
static void __exit i915_exit(void)
{
drm_pci_exit(&driver, &i915_pci_driver);
}
module_init(i915_init);
module_exit(i915_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL and additional rights");
/* We give fast paths for the really cool registers */
#define NEEDS_FORCE_WAKE(dev_priv, reg) \
((HAS_FORCE_WAKE((dev_priv)->dev)) && \
((reg) < 0x40000) && \
((reg) != FORCEWAKE))
static bool IS_DISPLAYREG(u32 reg)
{
/*
* This should make it easier to transition modules over to the
* new register block scheme, since we can do it incrementally.
*/
if (reg >= VLV_DISPLAY_BASE)
return false;
if (reg >= RENDER_RING_BASE &&
reg < RENDER_RING_BASE + 0xff)
return false;
if (reg >= GEN6_BSD_RING_BASE &&
reg < GEN6_BSD_RING_BASE + 0xff)
return false;
if (reg >= BLT_RING_BASE &&
reg < BLT_RING_BASE + 0xff)
return false;
if (reg == PGTBL_ER)
return false;
if (reg >= IPEIR_I965 &&
reg < HWSTAM)
return false;
if (reg == MI_MODE)
return false;
if (reg == GFX_MODE_GEN7)
return false;
if (reg == RENDER_HWS_PGA_GEN7 ||
reg == BSD_HWS_PGA_GEN7 ||
reg == BLT_HWS_PGA_GEN7)
return false;
if (reg == GEN6_BSD_SLEEP_PSMI_CONTROL ||
reg == GEN6_BSD_RNCID)
return false;
if (reg == GEN6_BLITTER_ECOSKPD)
return false;
if (reg >= 0x4000c &&
reg <= 0x4002c)
return false;
if (reg >= 0x4f000 &&
reg <= 0x4f08f)
return false;
if (reg >= 0x4f100 &&
reg <= 0x4f11f)
return false;
if (reg >= VLV_MASTER_IER &&
reg <= GEN6_PMIER)
return false;
if (reg >= FENCE_REG_SANDYBRIDGE_0 &&
reg < (FENCE_REG_SANDYBRIDGE_0 + (16*8)))
return false;
if (reg >= VLV_IIR_RW &&
reg <= VLV_ISR)
return false;
if (reg == FORCEWAKE_VLV ||
reg == FORCEWAKE_ACK_VLV)
return false;
if (reg == GEN6_GDRST)
return false;
switch (reg) {
case _3D_CHICKEN3:
case IVB_CHICKEN3:
case GEN7_COMMON_SLICE_CHICKEN1:
case GEN7_L3CNTLREG1:
case GEN7_L3_CHICKEN_MODE_REGISTER:
case GEN7_ROW_CHICKEN2:
case GEN7_L3SQCREG4:
case GEN7_SQ_CHICKEN_MBCUNIT_CONFIG:
case GEN7_HALF_SLICE_CHICKEN1:
case GEN6_MBCTL:
case GEN6_UCGCTL2:
return false;
default:
break;
}
return true;
}
static void
ilk_dummy_write(struct drm_i915_private *dev_priv)
{
/* WaIssueDummyWriteToWakeupFromRC6: Issue a dummy write to wake up the
* chip from rc6 before touching it for real. MI_MODE is masked, hence
* harmless to write 0 into. */
I915_WRITE_NOTRACE(MI_MODE, 0);
}
#define __i915_read(x, y) \
u##x i915_read##x(struct drm_i915_private *dev_priv, u32 reg) { \
u##x val = 0; \
if (IS_GEN5(dev_priv->dev)) \
ilk_dummy_write(dev_priv); \
if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
unsigned long irqflags; \
spin_lock_irqsave(&dev_priv->gt_lock, irqflags); \
if (dev_priv->forcewake_count == 0) \
dev_priv->gt.force_wake_get(dev_priv); \
val = read##y(dev_priv->regs + reg); \
if (dev_priv->forcewake_count == 0) \
dev_priv->gt.force_wake_put(dev_priv); \
spin_unlock_irqrestore(&dev_priv->gt_lock, irqflags); \
} else if (IS_VALLEYVIEW(dev_priv->dev) && IS_DISPLAYREG(reg)) { \
val = read##y(dev_priv->regs + reg + 0x180000); \
} else { \
val = read##y(dev_priv->regs + reg); \
} \
trace_i915_reg_rw(false, reg, val, sizeof(val)); \
return val; \
}
__i915_read(8, b)
__i915_read(16, w)
__i915_read(32, l)
__i915_read(64, q)
#undef __i915_read
#define __i915_write(x, y) \
void i915_write##x(struct drm_i915_private *dev_priv, u32 reg, u##x val) { \
u32 __fifo_ret = 0; \
trace_i915_reg_rw(true, reg, val, sizeof(val)); \
if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
__fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
} \
if (IS_GEN5(dev_priv->dev)) \
ilk_dummy_write(dev_priv); \
if (IS_HASWELL(dev_priv->dev) && (I915_READ_NOTRACE(GEN7_ERR_INT) & ERR_INT_MMIO_UNCLAIMED)) { \
DRM_ERROR("Unknown unclaimed register before writing to %x\n", reg); \
I915_WRITE_NOTRACE(GEN7_ERR_INT, ERR_INT_MMIO_UNCLAIMED); \
} \
if (IS_VALLEYVIEW(dev_priv->dev) && IS_DISPLAYREG(reg)) { \
write##y(val, dev_priv->regs + reg + 0x180000); \
} else { \
write##y(val, dev_priv->regs + reg); \
} \
if (unlikely(__fifo_ret)) { \
gen6_gt_check_fifodbg(dev_priv); \
} \
if (IS_HASWELL(dev_priv->dev) && (I915_READ_NOTRACE(GEN7_ERR_INT) & ERR_INT_MMIO_UNCLAIMED)) { \
DRM_ERROR("Unclaimed write to %x\n", reg); \
writel(ERR_INT_MMIO_UNCLAIMED, dev_priv->regs + GEN7_ERR_INT); \
} \
}
__i915_write(8, b)
__i915_write(16, w)
__i915_write(32, l)
__i915_write(64, q)
#undef __i915_write
static const struct register_whitelist {
uint64_t offset;
uint32_t size;
uint32_t gen_bitmask; /* support gens, 0x10 for 4, 0x30 for 4 and 5, etc. */
} whitelist[] = {
{ RING_TIMESTAMP(RENDER_RING_BASE), 8, 0xF0 },
};
int i915_reg_read_ioctl(struct drm_device *dev,
void *data, struct drm_file *file)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_i915_reg_read *reg = data;
struct register_whitelist const *entry = whitelist;
int i;
for (i = 0; i < ARRAY_SIZE(whitelist); i++, entry++) {
if (entry->offset == reg->offset &&
(1 << INTEL_INFO(dev)->gen & entry->gen_bitmask))
break;
}
if (i == ARRAY_SIZE(whitelist))
return -EINVAL;
switch (entry->size) {
case 8:
reg->val = I915_READ64(reg->offset);
break;
case 4:
reg->val = I915_READ(reg->offset);
break;
case 2:
reg->val = I915_READ16(reg->offset);
break;
case 1:
reg->val = I915_READ8(reg->offset);
break;
default:
WARN_ON(1);
return -EINVAL;
}
return 0;
}
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