All of lore.kernel.org
 help / color / mirror / Atom feed
From: Dongdong Liu <liudongdong3@huawei.com>
To: <helgaas@kernel.org>, <hch@infradead.org>, <kw@linux.com>,
	<linux-pci@vger.kernel.org>, <rajur@chelsio.com>,
	<hverkuil-cisco@xs4all.nl>
Cc: <linux-media@vger.kernel.org>, <netdev@vger.kernel.org>
Subject: [RESEND PATCH V3 1/6] PCI: Use cached Device Capabilities Register
Date: Sun, 13 Jun 2021 17:29:10 +0800	[thread overview]
Message-ID: <1623576555-40338-2-git-send-email-liudongdong3@huawei.com> (raw)
In-Reply-To: <1623576555-40338-1-git-send-email-liudongdong3@huawei.com>

It will make sense to store the pcie_devcap value in the pci_dev
structure instead of reading Device Capabilities Register multiple
times. The fisrt place to use pcie_devcap is in set_pcie_port_type(),
get the pcie_devcap value here, then use cached pcie_devcap in the
needed place.

Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Dongdong Liu <liudongdong3@huawei.com>
---
 drivers/media/pci/cobalt/cobalt-driver.c |  4 ++--
 drivers/pci/pci.c                        |  5 +----
 drivers/pci/pcie/aspm.c                  | 11 ++++-------
 drivers/pci/probe.c                      | 11 +++--------
 drivers/pci/quirks.c                     |  3 +--
 include/linux/pci.h                      |  1 +
 6 files changed, 12 insertions(+), 23 deletions(-)

diff --git a/drivers/media/pci/cobalt/cobalt-driver.c b/drivers/media/pci/cobalt/cobalt-driver.c
index 839503e..04e735f 100644
--- a/drivers/media/pci/cobalt/cobalt-driver.c
+++ b/drivers/media/pci/cobalt/cobalt-driver.c
@@ -193,11 +193,11 @@ void cobalt_pcie_status_show(struct cobalt *cobalt)
 		return;
 
 	/* Device */
-	pcie_capability_read_dword(pci_dev, PCI_EXP_DEVCAP, &capa);
 	pcie_capability_read_word(pci_dev, PCI_EXP_DEVCTL, &ctrl);
 	pcie_capability_read_word(pci_dev, PCI_EXP_DEVSTA, &stat);
 	cobalt_info("PCIe device capability 0x%08x: Max payload %d\n",
-		    capa, get_payload_size(capa & PCI_EXP_DEVCAP_PAYLOAD));
+		    capa,
+		    get_payload_size(pci_dev->pcie_devcap & PCI_EXP_DEVCAP_PAYLOAD));
 	cobalt_info("PCIe device control 0x%04x: Max payload %d. Max read request %d\n",
 		    ctrl,
 		    get_payload_size((ctrl & PCI_EXP_DEVCTL_PAYLOAD) >> 5),
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index b717680..68ccd77 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4620,13 +4620,10 @@ EXPORT_SYMBOL(pci_wait_for_pending_transaction);
  */
 bool pcie_has_flr(struct pci_dev *dev)
 {
-	u32 cap;
-
 	if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET)
 		return false;
 
-	pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap);
-	return cap & PCI_EXP_DEVCAP_FLR;
+	return dev->pcie_devcap & PCI_EXP_DEVCAP_FLR;
 }
 EXPORT_SYMBOL_GPL(pcie_has_flr);
 
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index ac0557a..d637564 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -660,7 +660,7 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist)
 
 	/* Get and check endpoint acceptable latencies */
 	list_for_each_entry(child, &linkbus->devices, bus_list) {
-		u32 reg32, encoding;
+		u32 encoding;
 		struct aspm_latency *acceptable =
 			&link->acceptable[PCI_FUNC(child->devfn)];
 
@@ -668,12 +668,11 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist)
 		    pci_pcie_type(child) != PCI_EXP_TYPE_LEG_END)
 			continue;
 
-		pcie_capability_read_dword(child, PCI_EXP_DEVCAP, &reg32);
 		/* Calculate endpoint L0s acceptable latency */
-		encoding = (reg32 & PCI_EXP_DEVCAP_L0S) >> 6;
+		encoding = (child->pcie_devcap & PCI_EXP_DEVCAP_L0S) >> 6;
 		acceptable->l0s = calc_l0s_acceptable(encoding);
 		/* Calculate endpoint L1 acceptable latency */
-		encoding = (reg32 & PCI_EXP_DEVCAP_L1) >> 9;
+		encoding = (child->pcie_devcap & PCI_EXP_DEVCAP_L1) >> 9;
 		acceptable->l1 = calc_l1_acceptable(encoding);
 
 		pcie_aspm_check_latency(child);
@@ -808,7 +807,6 @@ static void free_link_state(struct pcie_link_state *link)
 static int pcie_aspm_sanity_check(struct pci_dev *pdev)
 {
 	struct pci_dev *child;
-	u32 reg32;
 
 	/*
 	 * Some functions in a slot might not all be PCIe functions,
@@ -831,8 +829,7 @@ static int pcie_aspm_sanity_check(struct pci_dev *pdev)
 		 * Disable ASPM for pre-1.1 PCIe device, we follow MS to use
 		 * RBER bit to determine if a function is 1.1 version device
 		 */
-		pcie_capability_read_dword(child, PCI_EXP_DEVCAP, &reg32);
-		if (!(reg32 & PCI_EXP_DEVCAP_RBER) && !aspm_force) {
+		if (!(child->pcie_devcap & PCI_EXP_DEVCAP_RBER) && !aspm_force) {
 			pci_info(child, "disabling ASPM on pre-1.1 PCIe device.  You can enable it with 'pcie_aspm=force'\n");
 			return -EINVAL;
 		}
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 3a62d09..7963ab2 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1497,8 +1497,8 @@ void set_pcie_port_type(struct pci_dev *pdev)
 	pdev->pcie_cap = pos;
 	pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, &reg16);
 	pdev->pcie_flags_reg = reg16;
-	pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, &reg16);
-	pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
+	pci_read_config_dword(pdev, pos + PCI_EXP_DEVCAP, &pdev->pcie_devcap);
+	pdev->pcie_mpss = pdev->pcie_devcap & PCI_EXP_DEVCAP_PAYLOAD;
 
 	parent = pci_upstream_bridge(pdev);
 	if (!parent)
@@ -2008,18 +2008,13 @@ static void pci_configure_mps(struct pci_dev *dev)
 int pci_configure_extended_tags(struct pci_dev *dev, void *ign)
 {
 	struct pci_host_bridge *host;
-	u32 cap;
 	u16 ctl;
 	int ret;
 
 	if (!pci_is_pcie(dev))
 		return 0;
 
-	ret = pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap);
-	if (ret)
-		return 0;
-
-	if (!(cap & PCI_EXP_DEVCAP_EXT_TAG))
+	if (!(dev->pcie_devcap & PCI_EXP_DEVCAP_EXT_TAG))
 		return 0;
 
 	ret = pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &ctl);
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index dcb229d..b89b438 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5073,8 +5073,7 @@ static void quirk_intel_qat_vf_cap(struct pci_dev *pdev)
 		pdev->pcie_cap = pos;
 		pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, &reg16);
 		pdev->pcie_flags_reg = reg16;
-		pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, &reg16);
-		pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
+		pdev->pcie_mpss = pdev->pcie_devcap & PCI_EXP_DEVCAP_PAYLOAD;
 
 		pdev->cfg_size = PCI_CFG_SPACE_EXP_SIZE;
 		if (pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &status) !=
diff --git a/include/linux/pci.h b/include/linux/pci.h
index c20211e..555a3ac 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -340,6 +340,7 @@ struct pci_dev {
 	u8		rom_base_reg;	/* Config register controlling ROM */
 	u8		pin;		/* Interrupt pin this device uses */
 	u16		pcie_flags_reg;	/* Cached PCIe Capabilities Register */
+	u32		pcie_devcap;	/* Cached Device Capabilities Register */
 	unsigned long	*dma_alias_mask;/* Mask of enabled devfn aliases */
 
 	struct pci_driver *driver;	/* Driver bound to this device */
-- 
2.7.4


  reply	other threads:[~2021-06-13  9:30 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-13  9:29 [RESEND PATCH V3 0/6] PCI: Enable 10-Bit tag support for PCIe devices Dongdong Liu
2021-06-13  9:29 ` Dongdong Liu [this message]
2021-06-14  5:42   ` [RESEND PATCH V3 1/6] PCI: Use cached Device Capabilities Register Christoph Hellwig
2021-06-15  3:03     ` Dongdong Liu
2021-06-18 14:51   ` kernel test robot
2021-06-18 14:51     ` kernel test robot
2021-06-21  7:18     ` Dongdong Liu
2021-06-21  7:18       ` Dongdong Liu
2021-06-13  9:29 ` [RESEND PATCH V3 2/6] PCI: Use cached Device Capabilities 2 Register Dongdong Liu
2021-06-14  5:49   ` Christoph Hellwig
2021-06-15  3:04     ` Dongdong Liu
2021-06-13  9:29 ` [RESEND PATCH V3 3/6] PCI: Add 10-Bit Tag register definitions Dongdong Liu
2021-06-14  5:50   ` Christoph Hellwig
2021-06-13  9:29 ` [RESEND PATCH V3 4/6] PCI: Enable 10-Bit tag support for PCIe Endpoint devices Dongdong Liu
2021-06-14  5:54   ` Christoph Hellwig
2021-06-15  3:07     ` Dongdong Liu
2021-06-13  9:29 ` [RESEND PATCH V3 5/6] PCI/IOV: Enable 10-Bit tag support for PCIe VF devices Dongdong Liu
2021-06-14  5:55   ` Christoph Hellwig
2021-06-13  9:29 ` [RESEND PATCH V3 6/6] PCI: Enable 10-Bit tag support for PCIe RP devices Dongdong Liu
2021-06-14  5:57   ` Christoph Hellwig
2021-06-15  3:08     ` Dongdong Liu

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1623576555-40338-2-git-send-email-liudongdong3@huawei.com \
    --to=liudongdong3@huawei.com \
    --cc=hch@infradead.org \
    --cc=helgaas@kernel.org \
    --cc=hverkuil-cisco@xs4all.nl \
    --cc=kw@linux.com \
    --cc=linux-media@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=rajur@chelsio.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.