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Message-ID: <BL1PR12MB5144FF7542426AB3B4C66082F71BA@BL1PR12MB5144.namprd12.prod.outlook.com>
Date: Fri, 18 Aug 2023 16:12:57 +0000
From: "Deucher, Alexander" <Alexander.Deucher@....com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Rob Herring <robh@...nel.org>,
Krzysztof Wilczyński <kw@...ux.com>,
Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Heiner Kallweit <hkallweit1@...il.com>,
Lukas Wunner <lukas@...ner.de>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
"Koenig, Christian" <Christian.Koenig@....com>,
"Pan, Xinhui" <Xinhui.Pan@....com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
"amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: Dean Luick <dean.luick@...nelisnetworks.com>,
Jonas Dreßler <verdre@...d.nl>,
"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH v5 06/11] drm/radeon: Use RMW accessors for changing
LNKCTL
[Public]
> -----Original Message-----
> From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> Sent: Monday, July 17, 2023 8:05 AM
> To: linux-pci@...r.kernel.org; Bjorn Helgaas <bhelgaas@...gle.com>; Lorenzo
> Pieralisi <lorenzo.pieralisi@....com>; Rob Herring <robh@...nel.org>;
> Krzysztof Wilczyński <kw@...ux.com>; Emmanuel Grumbach
> <emmanuel.grumbach@...el.com>; Rafael J . Wysocki <rafael@...nel.org>;
> Heiner Kallweit <hkallweit1@...il.com>; Lukas Wunner <lukas@...ner.de>;
> Andy Shevchenko <andriy.shevchenko@...ux.intel.com>; Deucher, Alexander
> <Alexander.Deucher@....com>; Koenig, Christian
> <Christian.Koenig@....com>; Pan, Xinhui <Xinhui.Pan@....com>; David
> Airlie <airlied@...il.com>; Daniel Vetter <daniel@...ll.ch>; amd-
> gfx@...ts.freedesktop.org; dri-devel@...ts.freedesktop.org; linux-
> kernel@...r.kernel.org
> Cc: Dean Luick <dean.luick@...nelisnetworks.com>; Jonas Dreßler
> <verdre@...d.nl>; Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>;
> stable@...r.kernel.org
> Subject: [PATCH v5 06/11] drm/radeon: Use RMW accessors for changing
> LNKCTL
>
> Don't assume that only the driver would be accessing LNKCTL. ASPM policy
> changes can trigger write to LNKCTL outside of driver's control.
> And in the case of upstream bridge, the driver does not even own the device
> it's changing the registers for.
>
> Use RMW capability accessors which do proper locking to avoid losing
> concurrent updates to the register value.
>
> Fixes: 8a7cd27679d0 ("drm/radeon/cik: add support for pcie gen1/2/3
> switching")
> Fixes: b9d305dfb66c ("drm/radeon: implement pcie gen2/3 support for SI")
> Suggested-by: Lukas Wunner <lukas@...ner.de>
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> Cc: stable@...r.kernel.org
For this and the amdgpu patch:
Acked-by: Alex Deucher <alexander.deucher@....com>
I'm not sure if this is stable material however. Is there some issue today?
> ---
> drivers/gpu/drm/radeon/cik.c | 36 ++++++++++-------------------------
> drivers/gpu/drm/radeon/si.c | 37 ++++++++++--------------------------
> 2 files changed, 20 insertions(+), 53 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
> index 5819737c21c6..a6f3c811ceb8 100644
> --- a/drivers/gpu/drm/radeon/cik.c
> +++ b/drivers/gpu/drm/radeon/cik.c
> @@ -9534,17 +9534,8 @@ static void cik_pcie_gen3_enable(struct
> radeon_device *rdev)
> u16 bridge_cfg2, gpu_cfg2;
> u32 max_lw, current_lw, tmp;
>
> - pcie_capability_read_word(root, PCI_EXP_LNKCTL,
> - &bridge_cfg);
> - pcie_capability_read_word(rdev->pdev,
> PCI_EXP_LNKCTL,
> - &gpu_cfg);
> -
> - tmp16 = bridge_cfg | PCI_EXP_LNKCTL_HAWD;
> - pcie_capability_write_word(root, PCI_EXP_LNKCTL,
> tmp16);
> -
> - tmp16 = gpu_cfg | PCI_EXP_LNKCTL_HAWD;
> - pcie_capability_write_word(rdev->pdev,
> PCI_EXP_LNKCTL,
> - tmp16);
> + pcie_capability_set_word(root, PCI_EXP_LNKCTL,
> PCI_EXP_LNKCTL_HAWD);
> + pcie_capability_set_word(rdev->pdev,
> PCI_EXP_LNKCTL,
> +PCI_EXP_LNKCTL_HAWD);
>
> tmp = RREG32_PCIE_PORT(PCIE_LC_STATUS1);
> max_lw = (tmp & LC_DETECTED_LINK_WIDTH_MASK)
> >> LC_DETECTED_LINK_WIDTH_SHIFT; @@ -9591,21 +9582,14 @@ static
> void cik_pcie_gen3_enable(struct radeon_device *rdev)
> msleep(100);
>
> /* linkctl */
> - pcie_capability_read_word(root,
> PCI_EXP_LNKCTL,
> - &tmp16);
> - tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
> - tmp16 |= (bridge_cfg &
> PCI_EXP_LNKCTL_HAWD);
> - pcie_capability_write_word(root,
> PCI_EXP_LNKCTL,
> - tmp16);
> -
> - pcie_capability_read_word(rdev->pdev,
> - PCI_EXP_LNKCTL,
> - &tmp16);
> - tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
> - tmp16 |= (gpu_cfg &
> PCI_EXP_LNKCTL_HAWD);
> - pcie_capability_write_word(rdev->pdev,
> - PCI_EXP_LNKCTL,
> - tmp16);
> + pcie_capability_clear_and_set_word(root,
> PCI_EXP_LNKCTL,
> +
> PCI_EXP_LNKCTL_HAWD,
> + bridge_cfg &
> +
> PCI_EXP_LNKCTL_HAWD);
> + pcie_capability_clear_and_set_word(rdev-
> >pdev, PCI_EXP_LNKCTL,
> +
> PCI_EXP_LNKCTL_HAWD,
> + gpu_cfg &
> +
> PCI_EXP_LNKCTL_HAWD);
>
> /* linkctl2 */
> pcie_capability_read_word(root,
> PCI_EXP_LNKCTL2, diff --git a/drivers/gpu/drm/radeon/si.c
> b/drivers/gpu/drm/radeon/si.c index 8d5e4b25609d..a91012447b56
> 100644
> --- a/drivers/gpu/drm/radeon/si.c
> +++ b/drivers/gpu/drm/radeon/si.c
> @@ -7131,17 +7131,8 @@ static void si_pcie_gen3_enable(struct
> radeon_device *rdev)
> u16 bridge_cfg2, gpu_cfg2;
> u32 max_lw, current_lw, tmp;
>
> - pcie_capability_read_word(root, PCI_EXP_LNKCTL,
> - &bridge_cfg);
> - pcie_capability_read_word(rdev->pdev,
> PCI_EXP_LNKCTL,
> - &gpu_cfg);
> -
> - tmp16 = bridge_cfg | PCI_EXP_LNKCTL_HAWD;
> - pcie_capability_write_word(root, PCI_EXP_LNKCTL,
> tmp16);
> -
> - tmp16 = gpu_cfg | PCI_EXP_LNKCTL_HAWD;
> - pcie_capability_write_word(rdev->pdev,
> PCI_EXP_LNKCTL,
> - tmp16);
> + pcie_capability_set_word(root, PCI_EXP_LNKCTL,
> PCI_EXP_LNKCTL_HAWD);
> + pcie_capability_set_word(rdev->pdev,
> PCI_EXP_LNKCTL,
> +PCI_EXP_LNKCTL_HAWD);
>
> tmp = RREG32_PCIE(PCIE_LC_STATUS1);
> max_lw = (tmp & LC_DETECTED_LINK_WIDTH_MASK)
> >> LC_DETECTED_LINK_WIDTH_SHIFT; @@ -7188,22 +7179,14 @@ static
> void si_pcie_gen3_enable(struct radeon_device *rdev)
> msleep(100);
>
> /* linkctl */
> - pcie_capability_read_word(root,
> PCI_EXP_LNKCTL,
> - &tmp16);
> - tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
> - tmp16 |= (bridge_cfg &
> PCI_EXP_LNKCTL_HAWD);
> - pcie_capability_write_word(root,
> - PCI_EXP_LNKCTL,
> - tmp16);
> -
> - pcie_capability_read_word(rdev->pdev,
> - PCI_EXP_LNKCTL,
> - &tmp16);
> - tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
> - tmp16 |= (gpu_cfg &
> PCI_EXP_LNKCTL_HAWD);
> - pcie_capability_write_word(rdev->pdev,
> - PCI_EXP_LNKCTL,
> - tmp16);
> + pcie_capability_clear_and_set_word(root,
> PCI_EXP_LNKCTL,
> +
> PCI_EXP_LNKCTL_HAWD,
> + bridge_cfg &
> +
> PCI_EXP_LNKCTL_HAWD);
> + pcie_capability_clear_and_set_word(rdev-
> >pdev, PCI_EXP_LNKCTL,
> +
> PCI_EXP_LNKCTL_HAWD,
> + gpu_cfg &
> +
> PCI_EXP_LNKCTL_HAWD);
>
> /* linkctl2 */
> pcie_capability_read_word(root,
> PCI_EXP_LNKCTL2,
> --
> 2.30.2
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