[PATCH] drm/amdgpu: fix NULL pointer crash on navi10 headless SKU
Zhang, Hawking
Hawking.Zhang at amd.com
Fri Oct 30 12:48:39 UTC 2020
[AMD Public Use]
[AMD Public Use]
I see. Thanks for the clarifying, Tianci.
In such case, how about we add a new flag AMD_IS_HEADLESS to amd_chip_flags, so we can identify headless asic at the beginning when we add a new item to pciidlist.
Regards,
Hawking
From: Yin, Tianci (Rico) <Tianci.Yin at amd.com>
Sent: Friday, October 30, 2020 20:05
To: Zhang, Hawking <Hawking.Zhang at amd.com>; amd-gfx at lists.freedesktop.org
Cc: Tuikov, Luben <Luben.Tuikov at amd.com>; Deucher, Alexander <Alexander.Deucher at amd.com>; Chen, Guchun <Guchun.Chen at amd.com>; Cui, Flora <Flora.Cui at amd.com>; Xu, Feifei <Feifei.Xu at amd.com>; Long, Gang <Gang.Long at amd.com>
Subject: Re: [PATCH] drm/amdgpu: fix NULL pointer crash on navi10 headless SKU
[AMD Public Use]
Hi Hawking,
amdgpu_device_asic_has_dc_support() is referrenced by amdgpu_pci_probe(),
at that point, adev has not been allocated yet.
My change can make it to right code path.
int amdgpu_device_resume(struct drm_device *dev, bool fbcon)
{
...
if (!amdgpu_device_has_dc_support(adev))
drm_helper_hpd_irq_event(dev); //right path for headless SKU
else
drm_kms_helper_hotplug_event(dev); //wrong path for headless SKU
...
}
Thanks!
Rico
________________________________
From: Zhang, Hawking <Hawking.Zhang at amd.com<mailto:Hawking.Zhang at amd.com>>
Sent: Friday, October 30, 2020 19:48
To: Yin, Tianci (Rico) <Tianci.Yin at amd.com<mailto:Tianci.Yin at amd.com>>; amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org> <amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org>>
Cc: Tuikov, Luben <Luben.Tuikov at amd.com<mailto:Luben.Tuikov at amd.com>>; Deucher, Alexander <Alexander.Deucher at amd.com<mailto:Alexander.Deucher at amd.com>>; Chen, Guchun <Guchun.Chen at amd.com<mailto:Guchun.Chen at amd.com>>; Cui, Flora <Flora.Cui at amd.com<mailto:Flora.Cui at amd.com>>; Xu, Feifei <Feifei.Xu at amd.com<mailto:Feifei.Xu at amd.com>>; Long, Gang <Gang.Long at amd.com<mailto:Gang.Long at amd.com>>; Yin, Tianci (Rico) <Tianci.Yin at amd.com<mailto:Tianci.Yin at amd.com>>
Subject: RE: [PATCH] drm/amdgpu: fix NULL pointer crash on navi10 headless SKU
[AMD Public Use]
I'm not sure I get your point on changing amdgpu_device_has_dc_support() interface by adding new parameter. but it seems to me change input parameter from pdev to adev for nv_is_headless_sku is more straightforward.
Regards,
Hawking
-----Original Message-----
From: Tianci Yin <tianci.yin at amd.com<mailto:tianci.yin at amd.com>>
Sent: Friday, October 30, 2020 19:32
To: amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org>
Cc: Tuikov, Luben <Luben.Tuikov at amd.com<mailto:Luben.Tuikov at amd.com>>; Deucher, Alexander <Alexander.Deucher at amd.com<mailto:Alexander.Deucher at amd.com>>; Zhang, Hawking <Hawking.Zhang at amd.com<mailto:Hawking.Zhang at amd.com>>; Chen, Guchun <Guchun.Chen at amd.com<mailto:Guchun.Chen at amd.com>>; Cui, Flora <Flora.Cui at amd.com<mailto:Flora.Cui at amd.com>>; Xu, Feifei <Feifei.Xu at amd.com<mailto:Feifei.Xu at amd.com>>; Long, Gang <Gang.Long at amd.com<mailto:Gang.Long at amd.com>>; Yin, Tianci (Rico) <Tianci.Yin at amd.com<mailto:Tianci.Yin at amd.com>>
Subject: [PATCH] drm/amdgpu: fix NULL pointer crash on navi10 headless SKU
From: "Tianci.Yin" <tianci.yin at amd.com<mailto:tianci.yin at amd.com>>
The crash caused by the NULL pointer of
adev->ddev.mode_config.funcs in drm_kms_helper_hotplug_event(),
but this function should not be called on headless SKU.
Fix the mismatch between the return value of
amdgpu_device_has_dc_support() and the real DCN supporting state to avoid calling to drm_kms_helper_hotplug_event() in amdgpu_device_resume().
Change-Id: I3a3d387e6ab5b774abb3911ea1bf6de60797759d
Signed-off-by: Tianci.Yin <tianci.yin at amd.com<mailto:tianci.yin at amd.com>>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 10 ++++++++-- drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 2 +-
drivers/gpu/drm/amd/amdgpu/nv.c | 2 +-
drivers/gpu/drm/amd/amdgpu/nv.h | 1 +
6 files changed, 13 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index ba65d4f2ab67..f0183271456f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1090,7 +1090,7 @@ void amdgpu_device_indirect_wreg64(struct amdgpu_device *adev,
u32 pcie_index, u32 pcie_data,
u32 reg_addr, u64 reg_data);
-bool amdgpu_device_asic_has_dc_support(enum amd_asic_type asic_type);
+bool amdgpu_device_asic_has_dc_support(enum amd_asic_type asic_type,
+struct pci_dev *pdev);
bool amdgpu_device_has_dc_support(struct amdgpu_device *adev);
int emu_soc_asic_init(struct amdgpu_device *adev); diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 1fe850e0a94d..323ed69032a7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -2960,11 +2960,12 @@ static void amdgpu_device_detect_sriov_bios(struct amdgpu_device *adev)
* amdgpu_device_asic_has_dc_support - determine if DC supports the asic
*
* @asic_type: AMD asic type
+ * @pdev: pointer to pci_dev instance
*
* Check if there is DC (new modesetting infrastructre) support for an asic.
* returns true if DC has support, false if not.
*/
-bool amdgpu_device_asic_has_dc_support(enum amd_asic_type asic_type)
+bool amdgpu_device_asic_has_dc_support(enum amd_asic_type asic_type,
+struct pci_dev *pdev)
{
switch (asic_type) {
#if defined(CONFIG_DRM_AMD_DC)
@@ -3000,9 +3001,14 @@ bool amdgpu_device_asic_has_dc_support(enum amd_asic_type asic_type)
case CHIP_VEGA20:
#if defined(CONFIG_DRM_AMD_DC_DCN)
case CHIP_RAVEN:
+ return amdgpu_dc != 0;
case CHIP_NAVI10:
case CHIP_NAVI14:
case CHIP_NAVI12:
+ if (nv_is_headless_sku(pdev))
+ return false;
+ else
+ return amdgpu_dc != 0;
case CHIP_RENOIR:
#endif
#if defined(CONFIG_DRM_AMD_DC_DCN3_0)
@@ -3033,7 +3039,7 @@ bool amdgpu_device_has_dc_support(struct amdgpu_device *adev)
if (amdgpu_sriov_vf(adev) || adev->enable_virtual_display)
return false;
- return amdgpu_device_asic_has_dc_support(adev->asic_type);
+ return amdgpu_device_asic_has_dc_support(adev->asic_type, adev->pdev);
}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index 9e92d2a070ac..97014458d7de 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -516,7 +516,7 @@ uint32_t amdgpu_display_supported_domains(struct amdgpu_device *adev,
*/
if ((bo_flags & AMDGPU_GEM_CREATE_CPU_GTT_USWC) &&
amdgpu_bo_support_uswc(bo_flags) &&
- amdgpu_device_asic_has_dc_support(adev->asic_type)) {
+ amdgpu_device_asic_has_dc_support(adev->asic_type, adev->pdev)) {
switch (adev->asic_type) {
case CHIP_CARRIZO:
case CHIP_STONEY:
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 4b78ecfd35f7..b23110241267 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -1117,7 +1117,7 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
bool supports_atomic = false;
if (!amdgpu_virtual_display &&
- amdgpu_device_asic_has_dc_support(flags & AMD_ASIC_MASK))
+ amdgpu_device_asic_has_dc_support(flags & AMD_ASIC_MASK, pdev))
supports_atomic = true;
if ((flags & AMD_EXP_HW_SUPPORT) && !amdgpu_exp_hw_support) { diff --git a/drivers/gpu/drm/amd/amdgpu/nv.c b/drivers/gpu/drm/amd/amdgpu/nv.c index 026e0a8fd526..97446ae75b0b 100644
--- a/drivers/gpu/drm/amd/amdgpu/nv.c
+++ b/drivers/gpu/drm/amd/amdgpu/nv.c
@@ -493,7 +493,7 @@ void nv_set_virt_ops(struct amdgpu_device *adev)
adev->virt.ops = &xgpu_nv_virt_ops;
}
-static bool nv_is_headless_sku(struct pci_dev *pdev)
+bool nv_is_headless_sku(struct pci_dev *pdev)
{
if ((pdev->device == 0x731E &&
(pdev->revision == 0xC6 || pdev->revision == 0xC7)) || diff --git a/drivers/gpu/drm/amd/amdgpu/nv.h b/drivers/gpu/drm/amd/amdgpu/nv.h index 515d67bf249f..7880ad0073c9 100644
--- a/drivers/gpu/drm/amd/amdgpu/nv.h
+++ b/drivers/gpu/drm/amd/amdgpu/nv.h
@@ -29,6 +29,7 @@
void nv_grbm_select(struct amdgpu_device *adev,
u32 me, u32 pipe, u32 queue, u32 vmid); void nv_set_virt_ops(struct amdgpu_device *adev);
+bool nv_is_headless_sku(struct pci_dev *pdev);
int nv_set_ip_blocks(struct amdgpu_device *adev); int navi10_reg_base_init(struct amdgpu_device *adev); int navi14_reg_base_init(struct amdgpu_device *adev);
--
2.17.1
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