linux-kernel - [RFC PATCH v5 4/4] PCI/ASPM: Remove struct aspm

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Message-Id: <20211119193732.12343-5-refactormyself@gmail.com>
Date:   Fri, 19 Nov 2021 20:37:32 +0100
From:   "Saheed O. Bolarinwa" <refactormyself@...il.com>
To:     helgaas@...nel.org
Cc:     "Saheed O. Bolarinwa" <refactormyself@...il.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, hch@....de
Subject: [RFC PATCH v5 4/4] PCI/ASPM: Remove struct aspm_latency

The struct aspm_latency is now used only inside pcie_aspm_check_latency().

  - replace struct aspm_latency variables with u32 variables
  - remove struct aspm_latency

Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Saheed O. Bolarinwa <refactormyself@...il.com>
---
 drivers/pci/pcie/aspm.c | 32 +++++++++++++-------------------
 1 file changed, 13 insertions(+), 19 deletions(-)

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index a8821fe1ffe7..e29611080a90 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -41,11 +41,6 @@
 #define ASPM_STATE_ALL		(ASPM_STATE_L0S | ASPM_STATE_L1 |	\
 				 ASPM_STATE_L1SS)
 
-struct aspm_latency {
-	u32 l0s;			/* L0s latency (nsec) */
-	u32 l1;				/* L1 latency (nsec) */
-};
-
 struct pcie_link_state {
 	struct pci_dev *pdev;		/* Upstream component of the Link */
 	struct pci_dev *downstream;	/* Downstream component, function 0 */
@@ -384,9 +379,9 @@ static void encode_l12_threshold(u32 threshold_us, u32 *scale, u32 *value)
 static void pcie_aspm_check_latency(struct pci_dev *endpoint)
 {
 	u32 reg32, latency, encoding, lnkcap_up, lnkcap_dw;
-	u32 l1_switch_latency = 0;
-	struct aspm_latency latency_up, latency_dw;
-	struct aspm_latency *acceptable;
+	u32 l1_switch_latency = 0, latency_up_l0s;
+	u32 latency_up_l1, latency_dw_l0s, latency_dw_l1;
+	u32 acceptable_l0s, acceptable_l1;
 	struct pcie_link_state *link;
 
 	/* Device not in D0 doesn't need latency check */
@@ -398,10 +393,10 @@ static void pcie_aspm_check_latency(struct pci_dev *endpoint)
 	pcie_capability_read_dword(endpoint, PCI_EXP_DEVCAP, &reg32);
 	/* Calculate endpoint L0s acceptable latency */
 	encoding = (reg32 & PCI_EXP_DEVCAP_L0S) >> 6;
-	acceptable->l0s = calc_l0s_acceptable(encoding);
+	acceptable_l0s = calc_l0s_acceptable(encoding);
 	/* Calculate endpoint L1 acceptable latency */
 	encoding = (reg32 & PCI_EXP_DEVCAP_L1) >> 9;
-	acceptable->l1 = calc_l1_acceptable(encoding);
+	acceptable_l1 = calc_l1_acceptable(encoding);
 
 	while (link) {
 		struct pci_dev *dev = pci_function_0(
@@ -414,19 +409,19 @@ static void pcie_aspm_check_latency(struct pci_dev *endpoint)
 		pcie_capability_read_dword(dev,
 					   PCI_EXP_LNKCAP,
 					   &lnkcap_dw);
-		latency_up.l0s = calc_l0s_latency(lnkcap_up);
-		latency_up.l1 = calc_l1_latency(lnkcap_up);
-		latency_dw.l0s = calc_l0s_latency(lnkcap_dw);
-		latency_dw.l1 = calc_l1_latency(lnkcap_dw);
+		latency_up_l0s = calc_l0s_latency(lnkcap_up);
+		latency_up_l1 = calc_l1_latency(lnkcap_up);
+		latency_dw_l0s = calc_l0s_latency(lnkcap_dw);
+		latency_dw_l1 = calc_l1_latency(lnkcap_dw);
 
 		/* Check upstream direction L0s latency */
 		if ((link->aspm_capable & ASPM_STATE_L0S_UP) &&
-		    (latency_up.l0s > acceptable->l0s))
+		    (latency_up_l0s > acceptable_l0s))
 			link->aspm_capable &= ~ASPM_STATE_L0S_UP;
 
 		/* Check downstream direction L0s latency */
 		if ((link->aspm_capable & ASPM_STATE_L0S_DW) &&
-		    (latency_dw.l0s > acceptable->l0s))
+		    (latency_dw_l0s > acceptable_l0s))
 			link->aspm_capable &= ~ASPM_STATE_L0S_DW;
 		/*
 		 * Check L1 latency.
@@ -441,9 +436,9 @@ static void pcie_aspm_check_latency(struct pci_dev *endpoint)
 		 * L1 exit latencies advertised by a device include L1
 		 * substate latencies (and hence do not do any check).
 		 */
-		latency = max_t(u32, latency_up.l1, latency_dw.l1);
+		latency = max_t(u32, latency_up_l1, latency_dw_l1);
 		if ((link->aspm_capable & ASPM_STATE_L1) &&
-		    (latency + l1_switch_latency > acceptable->l1))
+		    (latency + l1_switch_latency > acceptable_l1))
 			link->aspm_capable &= ~ASPM_STATE_L1;
 		l1_switch_latency += 1000;
 
@@ -670,7 +665,6 @@ 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) {
-
 		if (pci_pcie_type(child) != PCI_EXP_TYPE_ENDPOINT &&
 		    pci_pcie_type(child) != PCI_EXP_TYPE_LEG_END)
 			continue;
-- 
2.20.1