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Wysocki" Cc: Koba Ko , Mika Westerberg , "David E . Box" , Sathyanarayanan Kuppuswamy , linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Bjorn Helgaas Subject: [PATCH v4 1/9] PCI/PTM: Cache PTM Capability offset Date: Fri, 9 Sep 2022 15:24:57 -0500 Message-Id: <20220909202505.314195-2-helgaas@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220909202505.314195-1-helgaas@kernel.org> References: <20220909202505.314195-1-helgaas@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Bjorn Helgaas Cache the PTM Capability offset instead of searching for it every time we enable/disable PTM or save/restore PTM state. No functional change intended. Signed-off-by: Bjorn Helgaas --- drivers/pci/pcie/ptm.c | 41 +++++++++++++++++------------------------ include/linux/pci.h | 1 + 2 files changed, 18 insertions(+), 24 deletions(-) diff --git a/drivers/pci/pcie/ptm.c b/drivers/pci/pcie/ptm.c index 368a254e3124..85382c135885 100644 --- a/drivers/pci/pcie/ptm.c +++ b/drivers/pci/pcie/ptm.c @@ -31,13 +31,9 @@ static void pci_ptm_info(struct pci_dev *dev) =20 void pci_disable_ptm(struct pci_dev *dev) { - int ptm; + u16 ptm =3D dev->ptm_cap; u16 ctrl; =20 - if (!pci_is_pcie(dev)) - return; - - ptm =3D pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PTM); if (!ptm) return; =20 @@ -48,14 +44,10 @@ void pci_disable_ptm(struct pci_dev *dev) =20 void pci_save_ptm_state(struct pci_dev *dev) { - int ptm; + u16 ptm =3D dev->ptm_cap; struct pci_cap_saved_state *save_state; u16 *cap; =20 - if (!pci_is_pcie(dev)) - return; - - ptm =3D pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PTM); if (!ptm) return; =20 @@ -69,16 +61,15 @@ void pci_save_ptm_state(struct pci_dev *dev) =20 void pci_restore_ptm_state(struct pci_dev *dev) { + u16 ptm =3D dev->ptm_cap; struct pci_cap_saved_state *save_state; - int ptm; u16 *cap; =20 - if (!pci_is_pcie(dev)) + if (!ptm) return; =20 save_state =3D pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_PTM); - ptm =3D pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PTM); - if (!save_state || !ptm) + if (!save_state) return; =20 cap =3D (u16 *)&save_state->cap.data[0]; @@ -87,7 +78,7 @@ void pci_restore_ptm_state(struct pci_dev *dev) =20 void pci_ptm_init(struct pci_dev *dev) { - int pos; + u16 ptm; u32 cap, ctrl; u8 local_clock; struct pci_dev *ups; @@ -117,13 +108,14 @@ void pci_ptm_init(struct pci_dev *dev) return; } =20 - pos =3D pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PTM); - if (!pos) + ptm =3D pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PTM); + if (!ptm) return; =20 + dev->ptm_cap =3D ptm; pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_PTM, sizeof(u16)); =20 - pci_read_config_dword(dev, pos + PCI_PTM_CAP, &cap); + pci_read_config_dword(dev, ptm + PCI_PTM_CAP, &cap); local_clock =3D (cap & PCI_PTM_GRANULARITY_MASK) >> 8; =20 /* @@ -148,7 +140,7 @@ void pci_ptm_init(struct pci_dev *dev) } =20 ctrl |=3D dev->ptm_granularity << 8; - pci_write_config_dword(dev, pos + PCI_PTM_CTRL, ctrl); + pci_write_config_dword(dev, ptm + PCI_PTM_CTRL, ctrl); dev->ptm_enabled =3D 1; =20 pci_ptm_info(dev); @@ -156,18 +148,19 @@ void pci_ptm_init(struct pci_dev *dev) =20 int pci_enable_ptm(struct pci_dev *dev, u8 *granularity) { - int pos; + u16 ptm; u32 cap, ctrl; struct pci_dev *ups; =20 if (!pci_is_pcie(dev)) return -EINVAL; =20 - pos =3D pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PTM); - if (!pos) + ptm =3D pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PTM); + if (!ptm) return -EINVAL; =20 - pci_read_config_dword(dev, pos + PCI_PTM_CAP, &cap); + dev->ptm_cap =3D ptm; + pci_read_config_dword(dev, ptm + PCI_PTM_CAP, &cap); if (!(cap & PCI_PTM_CAP_REQ)) return -EINVAL; =20 @@ -192,7 +185,7 @@ int pci_enable_ptm(struct pci_dev *dev, u8 *granularity) =20 ctrl =3D PCI_PTM_CTRL_ENABLE; ctrl |=3D dev->ptm_granularity << 8; - pci_write_config_dword(dev, pos + PCI_PTM_CTRL, ctrl); + pci_write_config_dword(dev, ptm + PCI_PTM_CTRL, ctrl); dev->ptm_enabled =3D 1; =20 pci_ptm_info(dev); diff --git a/include/linux/pci.h b/include/linux/pci.h index 060af91bafcd..54be939023a3 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -475,6 +475,7 @@ struct pci_dev { unsigned int broken_cmd_compl:1; /* No compl for some cmds */ #endif #ifdef CONFIG_PCIE_PTM + u16 ptm_cap; /* PTM Capability */ unsigned int ptm_root:1; unsigned int ptm_enabled:1; u8 ptm_granularity; --=20 2.25.1