From: Jiang Liu <liuj97@gmail.com>
To: Bjorn Helgaas <bhelgaas@google.com>, Don Dutile <ddutile@redhat.com>
Cc: Yijing Wang <wangyijing@huawei.com>,
Yinghai Lu <yinghai@kernel.org>,
Taku Izumi <izumi.taku@jp.fujitsu.com>,
"Rafael J . Wysocki" <rjw@sisk.pl>,
Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>,
Keping Chen <chenkeping@huawei.com>,
linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
Jiang Liu <liuj97@gmail.com>
Subject: [RFC PATCH 01/14] PCI: add pcie_flags into struct pci_dev to cache PCIe capabilities register
Date: Tue, 10 Jul 2012 23:54:02 +0800 [thread overview]
Message-ID: <1341935655-5381-2-git-send-email-jiang.liu@huawei.com> (raw)
In-Reply-To: <1341935655-5381-1-git-send-email-jiang.liu@huawei.com>
In-Reply-To: <CAErSpo70NtEJFaQmDtdTLkSB3fQRNy78juAQO-KbXeceZkunkw@mail.gmail.com>
From: Yijing Wang <wangyijing@huawei.com>
From: Yijing Wang <wangyijing@huawei.com>
Since PCI Express Capabilities Register is read only, cache its value
into struct pci_dev to avoid repeatedly calling pci_read_config_*().
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Jiang Liu <liuj97@gmail.com>
---
drivers/pci/probe.c | 1 +
include/linux/pci.h | 1 +
2 files changed, 2 insertions(+)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 6c143b4..65e82e3 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -929,6 +929,7 @@ void set_pcie_port_type(struct pci_dev *pdev)
pdev->is_pcie = 1;
pdev->pcie_cap = pos;
pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
+ pdev->pcie_flags = reg16;
pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16);
pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 5faa831..f4a7ad6 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -258,6 +258,7 @@ struct pci_dev {
u8 pcie_mpss:3; /* PCI-E Max Payload Size Supported */
u8 rom_base_reg; /* which config register controls the ROM */
u8 pin; /* which interrupt pin this device uses */
+ u16 pcie_flags; /* cached PCI-E Capabilities Register */
struct pci_driver *driver; /* which driver has allocated this device */
u64 dma_mask; /* Mask of the bits of bus address this
--
1.7.9.5
next prev parent reply other threads:[~2012-07-10 15:54 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-04 7:44 [Resend with Ack][PATCH v1] PCI: allow acpiphp to handle PCIe ports without native PCIe hotplug capability Jiang Liu
2012-06-04 8:23 ` Kenji Kaneshige
2012-07-03 4:16 ` Bjorn Helgaas
2012-07-03 15:59 ` Bjorn Helgaas
2012-07-03 19:50 ` Don Dutile
2012-07-04 18:07 ` Bjorn Helgaas
2012-07-09 10:05 ` Jiang Liu
2012-07-09 17:05 ` Bjorn Helgaas
2012-07-04 2:52 ` Jiang Liu
2012-07-10 15:54 ` [RFC PATCH 00/14] improve PCIe capabilities registers handling Jiang Liu
2012-07-10 18:44 ` Bjorn Helgaas
2012-07-10 15:54 ` Jiang Liu [this message]
2012-07-11 9:01 ` [RFC PATCH 01/14] PCI: add pcie_flags into struct pci_dev to cache PCIe capabilities register Taku Izumi
2012-07-11 14:27 ` Jiang Liu
2012-07-10 15:54 ` [RFC PATCH 02/14] PCI: introduce pci_pcie_type(dev) to replace pci_dev->pcie_type Jiang Liu
2012-07-10 15:54 ` [RFC PATCH 03/14] PCI: remove unused field pcie_type from struct pci_dev Jiang Liu
2012-07-10 15:54 ` [RFC PATCH 04/14] PCI: refine and move pcie_cap_has_*() macros to include/linux/pci.h Jiang Liu
2012-07-10 18:49 ` Bjorn Helgaas
2012-07-10 15:54 ` [RFC PATCH 05/14] PCI: add access functions for PCIe capabilities to hide PCIe spec differences Jiang Liu
2012-07-10 18:35 ` Bjorn Helgaas
2012-07-11 3:07 ` Jiang Liu
2012-07-11 3:40 ` Bjorn Helgaas
2012-07-11 6:40 ` Jiang Liu
2012-07-11 17:52 ` Bjorn Helgaas
2012-07-12 2:56 ` Jiang Liu
2012-07-12 20:49 ` Bjorn Helgaas
2012-07-15 16:47 ` Jiang Liu
2012-07-16 17:29 ` Bjorn Helgaas
2012-07-16 18:57 ` Don Dutile
2012-07-17 0:09 ` Jiang Liu
2012-07-17 0:14 ` Bjorn Helgaas
2012-07-10 15:54 ` [RFC PATCH 06/14] PCI: use PCIe cap access functions to simplify PCI core implementation Jiang Liu
2012-07-10 18:35 ` Bjorn Helgaas
2012-07-11 2:49 ` Jiang Liu
2012-07-10 15:54 ` [RFC PATCH 07/14] hotplug/PCI: use PCIe cap access functions to simplify implementation Jiang Liu
2012-07-10 18:35 ` Bjorn Helgaas
2012-07-10 15:54 ` [RFC PATCH 08/14] portdrv/PCI: " Jiang Liu
2012-07-10 15:54 ` [RFC PATCH 09/14] pciehp/PCI: " Jiang Liu
2012-07-10 15:54 ` [RFC PATCH 10/14] PME/PCI: " Jiang Liu
2012-07-10 15:54 ` [RFC PATCH 11/14] AER/PCI: " Jiang Liu
2012-07-10 15:54 ` [RFC PATCH 12/14] ASPM/PCI: " Jiang Liu
2012-07-10 15:54 ` [RFC PATCH 13/14] r8169/PCI: " Jiang Liu
2012-07-10 15:54 ` [RFC PATCH 14/14] qib/PCI: " Jiang Liu
2012-08-15 19:12 ` [Resend with Ack][PATCH v1] PCI: allow acpiphp to handle PCIe ports without native PCIe hotplug capability Bjorn Helgaas
2012-08-16 15:15 ` Jiang Liu
2012-08-22 15:16 ` [PATCH v2] PCI: allow acpiphp to handle PCIe ports w/o " Jiang Liu
2012-09-24 22:10 ` Bjorn Helgaas
2012-09-25 15:16 ` Jiang Liu
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