From: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
To: linux-pci@vger.kernel.org, "Bjorn Helgaas" <bhelgaas@google.com>,
"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Lukas Wunner" <lukas@wunner.de>,
"Alexandru Gagniuc" <mr.nuke.me@gmail.com>,
"Krishna chaitanya chundru" <quic_krichai@quicinc.com>,
"Srinivas Pandruvada" <srinivas.pandruvada@linux.intel.com>,
"Rafael J. Wysocki" <rafael@kernel.org>,
linux-pm@vger.kernel.org,
"Alex Deucher" <alexander.deucher@amd.com>,
"Christian König" <christian.koenig@amd.com>,
"Pan, Xinhui" <Xinhui.Pan@amd.com>,
"David Airlie" <airlied@gmail.com>,
"Daniel Vetter" <daniel@ffwll.ch>,
amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org
Cc: "Alex Deucher" <alexdeucher@gmail.com>,
"Daniel Lezcano" <daniel.lezcano@linaro.org>,
"Amit Kucheria" <amitk@kernel.org>,
"Zhang Rui" <rui.zhang@intel.com>,
"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
Subject: [PATCH v4 2/8] drm/radeon: Use RMW accessors for changing LNKCTL2
Date: Fri, 5 Jan 2024 13:25:41 +0200 [thread overview]
Message-ID: <20240105112547.7301-3-ilpo.jarvinen@linux.intel.com> (raw)
In-Reply-To: <20240105112547.7301-1-ilpo.jarvinen@linux.intel.com>
Don't assume that only the driver would be accessing LNKCTL2. In the
case of upstream (parent), 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. This change is also useful as
a cleanup.
Suggested-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
drivers/gpu/drm/radeon/cik.c | 40 ++++++++++++++----------------------
drivers/gpu/drm/radeon/si.c | 40 ++++++++++++++----------------------
2 files changed, 30 insertions(+), 50 deletions(-)
diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index 10be30366c2b..b5e96a8fc2c1 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -9592,28 +9592,18 @@ static void cik_pcie_gen3_enable(struct radeon_device *rdev)
PCI_EXP_LNKCTL_HAWD);
/* linkctl2 */
- pcie_capability_read_word(root, PCI_EXP_LNKCTL2,
- &tmp16);
- tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP |
- PCI_EXP_LNKCTL2_TX_MARGIN);
- tmp16 |= (bridge_cfg2 &
- (PCI_EXP_LNKCTL2_ENTER_COMP |
- PCI_EXP_LNKCTL2_TX_MARGIN));
- pcie_capability_write_word(root,
- PCI_EXP_LNKCTL2,
- tmp16);
-
- pcie_capability_read_word(rdev->pdev,
- PCI_EXP_LNKCTL2,
- &tmp16);
- tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP |
- PCI_EXP_LNKCTL2_TX_MARGIN);
- tmp16 |= (gpu_cfg2 &
- (PCI_EXP_LNKCTL2_ENTER_COMP |
- PCI_EXP_LNKCTL2_TX_MARGIN));
- pcie_capability_write_word(rdev->pdev,
- PCI_EXP_LNKCTL2,
- tmp16);
+ pcie_capability_clear_and_set_word(root, PCI_EXP_LNKCTL2,
+ PCI_EXP_LNKCTL2_ENTER_COMP |
+ PCI_EXP_LNKCTL2_TX_MARGIN,
+ bridge_cfg2 |
+ (PCI_EXP_LNKCTL2_ENTER_COMP |
+ PCI_EXP_LNKCTL2_TX_MARGIN));
+ pcie_capability_clear_and_set_word(rdev->pdev, PCI_EXP_LNKCTL2,
+ PCI_EXP_LNKCTL2_ENTER_COMP |
+ PCI_EXP_LNKCTL2_TX_MARGIN,
+ gpu_cfg2 |
+ (PCI_EXP_LNKCTL2_ENTER_COMP |
+ PCI_EXP_LNKCTL2_TX_MARGIN));
tmp = RREG32_PCIE_PORT(PCIE_LC_CNTL4);
tmp &= ~LC_SET_QUIESCE;
@@ -9627,15 +9617,15 @@ static void cik_pcie_gen3_enable(struct radeon_device *rdev)
speed_cntl &= ~LC_FORCE_DIS_SW_SPEED_CHANGE;
WREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL, speed_cntl);
- pcie_capability_read_word(rdev->pdev, PCI_EXP_LNKCTL2, &tmp16);
- tmp16 &= ~PCI_EXP_LNKCTL2_TLS;
+ tmp16 = 0;
if (speed_cap == PCIE_SPEED_8_0GT)
tmp16 |= PCI_EXP_LNKCTL2_TLS_8_0GT; /* gen3 */
else if (speed_cap == PCIE_SPEED_5_0GT)
tmp16 |= PCI_EXP_LNKCTL2_TLS_5_0GT; /* gen2 */
else
tmp16 |= PCI_EXP_LNKCTL2_TLS_2_5GT; /* gen1 */
- pcie_capability_write_word(rdev->pdev, PCI_EXP_LNKCTL2, tmp16);
+ pcie_capability_clear_and_set_word(rdev->pdev, PCI_EXP_LNKCTL2,
+ PCI_EXP_LNKCTL2_TLS, tmp16);
speed_cntl = RREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL);
speed_cntl |= LC_INITIATE_LINK_SPEED_CHANGE;
diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
index a91012447b56..32871ca09a0f 100644
--- a/drivers/gpu/drm/radeon/si.c
+++ b/drivers/gpu/drm/radeon/si.c
@@ -7189,28 +7189,18 @@ static void si_pcie_gen3_enable(struct radeon_device *rdev)
PCI_EXP_LNKCTL_HAWD);
/* linkctl2 */
- pcie_capability_read_word(root, PCI_EXP_LNKCTL2,
- &tmp16);
- tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP |
- PCI_EXP_LNKCTL2_TX_MARGIN);
- tmp16 |= (bridge_cfg2 &
- (PCI_EXP_LNKCTL2_ENTER_COMP |
- PCI_EXP_LNKCTL2_TX_MARGIN));
- pcie_capability_write_word(root,
- PCI_EXP_LNKCTL2,
- tmp16);
-
- pcie_capability_read_word(rdev->pdev,
- PCI_EXP_LNKCTL2,
- &tmp16);
- tmp16 &= ~(PCI_EXP_LNKCTL2_ENTER_COMP |
- PCI_EXP_LNKCTL2_TX_MARGIN);
- tmp16 |= (gpu_cfg2 &
- (PCI_EXP_LNKCTL2_ENTER_COMP |
- PCI_EXP_LNKCTL2_TX_MARGIN));
- pcie_capability_write_word(rdev->pdev,
- PCI_EXP_LNKCTL2,
- tmp16);
+ pcie_capability_clear_and_set_word(root, PCI_EXP_LNKCTL2,
+ PCI_EXP_LNKCTL2_ENTER_COMP |
+ PCI_EXP_LNKCTL2_TX_MARGIN,
+ bridge_cfg2 &
+ (PCI_EXP_LNKCTL2_ENTER_COMP |
+ PCI_EXP_LNKCTL2_TX_MARGIN));
+ pcie_capability_clear_and_set_word(rdev->pdev, PCI_EXP_LNKCTL2,
+ PCI_EXP_LNKCTL2_ENTER_COMP |
+ PCI_EXP_LNKCTL2_TX_MARGIN,
+ gpu_cfg2 &
+ (PCI_EXP_LNKCTL2_ENTER_COMP |
+ PCI_EXP_LNKCTL2_TX_MARGIN));
tmp = RREG32_PCIE_PORT(PCIE_LC_CNTL4);
tmp &= ~LC_SET_QUIESCE;
@@ -7224,15 +7214,15 @@ static void si_pcie_gen3_enable(struct radeon_device *rdev)
speed_cntl &= ~LC_FORCE_DIS_SW_SPEED_CHANGE;
WREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL, speed_cntl);
- pcie_capability_read_word(rdev->pdev, PCI_EXP_LNKCTL2, &tmp16);
- tmp16 &= ~PCI_EXP_LNKCTL2_TLS;
+ tmp16 = 0;
if (speed_cap == PCIE_SPEED_8_0GT)
tmp16 |= PCI_EXP_LNKCTL2_TLS_8_0GT; /* gen3 */
else if (speed_cap == PCIE_SPEED_5_0GT)
tmp16 |= PCI_EXP_LNKCTL2_TLS_5_0GT; /* gen2 */
else
tmp16 |= PCI_EXP_LNKCTL2_TLS_2_5GT; /* gen1 */
- pcie_capability_write_word(rdev->pdev, PCI_EXP_LNKCTL2, tmp16);
+ pcie_capability_clear_and_set_word(rdev->pdev, PCI_EXP_LNKCTL2,
+ PCI_EXP_LNKCTL2_TLS, tmp16);
speed_cntl = RREG32_PCIE_PORT(PCIE_LC_SPEED_CNTL);
speed_cntl |= LC_INITIATE_LINK_SPEED_CHANGE;
--
2.39.2
next prev parent reply other threads:[~2024-01-05 11:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-05 11:25 [PATCH v4 0/8] Add PCIe bandwidth controller Ilpo Järvinen
2024-01-05 11:25 ` [PATCH v4 1/8] PCI: Protect Link Control 2 Register with RMW locking Ilpo Järvinen
2024-01-05 11:25 ` Ilpo Järvinen [this message]
2024-01-05 11:25 ` [PATCH v4 3/8] drm/amdgpu: Use RMW accessors for changing LNKCTL2 Ilpo Järvinen
2024-01-05 11:25 ` [PATCH v4 4/8] RDMA/hfi1: " Ilpo Järvinen
2024-01-05 11:25 ` [PATCH v4 5/8] PCI: Store all PCIe Supported Link Speeds Ilpo Järvinen
2024-01-05 11:25 ` [PATCH v4 6/8] PCI/link: Re-add BW notification portdrv as PCIe BW controller Ilpo Järvinen
2024-01-09 9:14 ` Krishna Chaitanya Chundru
2024-01-09 13:28 ` Ilpo Järvinen
2024-01-05 11:25 ` [PATCH v4 7/8] thermal: Add PCIe cooling driver Ilpo Järvinen
2024-01-05 11:56 ` Christophe JAILLET
2024-01-05 11:25 ` [PATCH v4 8/8] selftests/pcie_bwctrl: Create selftests Ilpo Järvinen
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