From 080691d7b1af67205081dff5a7fc4a988e080981 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>
Date: Mon, 10 Jan 2022 02:12:45 +0100
Subject: [PATCH] kernel: 5.10: Backport pending pci-aardvark changes fixing
MSI support
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Backport Aardvark PCIe controller driver changes that fix MSI support,
that were recently sent to the linux-pci mailing list [1].
These changes fix MSI and MSI-X support for this PCIe controller, which,
among other things, make it possible to use NVMe drives with this PCIe
controllers.
[1] https://lore.kernel.org/linux-pci/20220110015018.26359-1-kabel@kernel.org/
Signed-off-by: Marek Behún <kabel@kernel.org>
---
...lace-custom-PCIE_CORE_INT_-macros-wi.patch | 45 +++++
...ark-Fix-reading-MSI-interrupt-number.patch | 62 ++++++
...dvark-Fix-support-for-MSI-interrupts.patch | 77 ++++++++
...rite-IRQ-code-to-chained-IRQ-handler.patch | 130 +++++++++++++
...ck-return-value-of-generic_handle_do.patch | 36 ++++
...e-MSI-irq_chip-structures-static-dri.patch | 98 ++++++++++
...e-msi_domain_info-structure-a-static.patch | 69 +++++++
...-dev_fwnode-instead-of-of_node_to_fw.patch | 45 +++++
...actor-unmasking-summary-MSI-interrup.patch | 49 +++++
...d-support-for-masking-MSI-interrupts.patch | 122 ++++++++++++
...PCI-aardvark-Fix-setting-MSI-address.patch | 96 ++++++++++
...12-PCI-aardvark-Enable-MSI-X-support.patch | 43 +++++
...-support-for-ERR-interrupt-on-emulat.patch | 105 +++++++++++
...-reading-PCI_EXP_RTSTA_PME-bit-on-em.patch | 49 +++++
...imize-writing-PCI_EXP_RTCTL_PMEIE-an.patch | 57 ++++++
...dvark-Add-support-for-PME-interrupts.patch | 52 +++++
...-support-for-PME-requester-on-emulat.patch | 178 ++++++++++++++++++
...-separate-INTA-interrupt-for-emulate.patch | 166 ++++++++++++++++
...ove-irq_mask_ack-callback-for-INTx-i.patch | 34 ++++
...aardvark-Don-t-mask-irq-when-mapping.patch | 32 ++++
...p-__maybe_unused-from-advk_pcie_disa.patch | 33 ++++
...ate-comment-about-link-going-down-af.patch | 40 ++++
...e-main-irq_chip-structure-a-static-d.patch | 107 +++++++++++
23 files changed, 1725 insertions(+)
create mode 100644 target/linux/generic/pending-5.10/850-0001-PCI-aardvark-Replace-custom-PCIE_CORE_INT_-macros-wi.patch
create mode 100644 target/linux/generic/pending-5.10/850-0002-PCI-aardvark-Fix-reading-MSI-interrupt-number.patch
create mode 100644 target/linux/generic/pending-5.10/850-0003-PCI-aardvark-Fix-support-for-MSI-interrupts.patch
create mode 100644 target/linux/generic/pending-5.10/850-0004-PCI-aardvark-Rewrite-IRQ-code-to-chained-IRQ-handler.patch
create mode 100644 target/linux/generic/pending-5.10/850-0005-PCI-aardvark-Check-return-value-of-generic_handle_do.patch
create mode 100644 target/linux/generic/pending-5.10/850-0006-PCI-aardvark-Make-MSI-irq_chip-structures-static-dri.patch
create mode 100644 target/linux/generic/pending-5.10/850-0007-PCI-aardvark-Make-msi_domain_info-structure-a-static.patch
create mode 100644 target/linux/generic/pending-5.10/850-0008-PCI-aardvark-Use-dev_fwnode-instead-of-of_node_to_fw.patch
create mode 100644 target/linux/generic/pending-5.10/850-0009-PCI-aardvark-Refactor-unmasking-summary-MSI-interrup.patch
create mode 100644 target/linux/generic/pending-5.10/850-0010-PCI-aardvark-Add-support-for-masking-MSI-interrupts.patch
create mode 100644 target/linux/generic/pending-5.10/850-0011-PCI-aardvark-Fix-setting-MSI-address.patch
create mode 100644 target/linux/generic/pending-5.10/850-0012-PCI-aardvark-Enable-MSI-X-support.patch
create mode 100644 target/linux/generic/pending-5.10/850-0013-PCI-aardvark-Add-support-for-ERR-interrupt-on-emulat.patch
create mode 100644 target/linux/generic/pending-5.10/850-0014-PCI-aardvark-Fix-reading-PCI_EXP_RTSTA_PME-bit-on-em.patch
create mode 100644 target/linux/generic/pending-5.10/850-0015-PCI-aardvark-Optimize-writing-PCI_EXP_RTCTL_PMEIE-an.patch
create mode 100644 target/linux/generic/pending-5.10/850-0016-PCI-aardvark-Add-support-for-PME-interrupts.patch
create mode 100644 target/linux/generic/pending-5.10/850-0017-PCI-aardvark-Fix-support-for-PME-requester-on-emulat.patch
create mode 100644 target/linux/generic/pending-5.10/850-0018-PCI-aardvark-Use-separate-INTA-interrupt-for-emulate.patch
create mode 100644 target/linux/generic/pending-5.10/850-0019-PCI-aardvark-Remove-irq_mask_ack-callback-for-INTx-i.patch
create mode 100644 target/linux/generic/pending-5.10/850-0020-PCI-aardvark-Don-t-mask-irq-when-mapping.patch
create mode 100644 target/linux/generic/pending-5.10/850-0021-PCI-aardvark-Drop-__maybe_unused-from-advk_pcie_disa.patch
create mode 100644 target/linux/generic/pending-5.10/850-0022-PCI-aardvark-Update-comment-about-link-going-down-af.patch
create mode 100644 target/linux/generic/pending-5.10/850-0023-PCI-aardvark-Make-main-irq_chip-structure-a-static-d.patch
diff --git a/target/linux/generic/pending-5.10/850-0001-PCI-aardvark-Replace-custom-PCIE_CORE_INT_-macros-wi.patch b/target/linux/generic/pending-5.10/850-0001-PCI-aardvark-Replace-custom-PCIE_CORE_INT_-macros-wi.patch
new file mode 100644
index 00000000000..c63d016c35c
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0001-PCI-aardvark-Replace-custom-PCIE_CORE_INT_-macros-wi.patch
@@ -0,0 +1,45 @@
+From 43f3f187e6f62ca40802afe39495c8a3e20b4bfa Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Mon, 10 Jan 2022 01:50:50 +0100
+Subject: [PATCH] PCI: aardvark: Replace custom PCIE_CORE_INT_* macros with
+ PCI_INTERRUPT_*
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Header file linux/pci.h defines enum pci_interrupt_pin with corresponding
+PCI_INTERRUPT_* values.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 6 +-----
+ 1 file changed, 1 insertion(+), 5 deletions(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index 226bce2f98f6..a573fc1aa4dd 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -37,10 +37,6 @@
+ #define PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX_EN BIT(6)
+ #define PCIE_CORE_ERR_CAPCTL_ECRC_CHCK BIT(7)
+ #define PCIE_CORE_ERR_CAPCTL_ECRC_CHCK_RCV BIT(8)
+-#define PCIE_CORE_INT_A_ASSERT_ENABLE 1
+-#define PCIE_CORE_INT_B_ASSERT_ENABLE 2
+-#define PCIE_CORE_INT_C_ASSERT_ENABLE 3
+-#define PCIE_CORE_INT_D_ASSERT_ENABLE 4
+ /* PIO registers base address and register offsets */
+ #define PIO_BASE_ADDR 0x4000
+ #define PIO_CTRL (PIO_BASE_ADDR + 0x0)
+@@ -967,7 +963,7 @@ static int advk_sw_pci_bridge_init(struct advk_pcie *pcie)
+ bridge->conf.pref_mem_limit = cpu_to_le16(PCI_PREF_RANGE_TYPE_64);
+
+ /* Support interrupt A for MSI feature */
+- bridge->conf.intpin = PCIE_CORE_INT_A_ASSERT_ENABLE;
++ bridge->conf.intpin = PCI_INTERRUPT_INTA;
+
+ /* Indicates supports for Completion Retry Status */
+ bridge->pcie_conf.rootcap = cpu_to_le16(PCI_EXP_RTCAP_CRSVIS);
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0002-PCI-aardvark-Fix-reading-MSI-interrupt-number.patch b/target/linux/generic/pending-5.10/850-0002-PCI-aardvark-Fix-reading-MSI-interrupt-number.patch
new file mode 100644
index 00000000000..25922eeb0a3
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0002-PCI-aardvark-Fix-reading-MSI-interrupt-number.patch
@@ -0,0 +1,62 @@
+From a29a7d01cd778854e08108461cba321a63d98871 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Fri, 2 Jul 2021 16:39:47 +0200
+Subject: [PATCH] PCI: aardvark: Fix reading MSI interrupt number
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+In advk_pcie_handle_msi() the authors expect that when bit i in the W1C
+register PCIE_MSI_STATUS_REG is cleared, the PCIE_MSI_PAYLOAD_REG is
+updated to contain the MSI number corresponding to index i.
+
+Experiments show that this is not so, and instead PCIE_MSI_PAYLOAD_REG
+always contains the number of the last received MSI, overall.
+
+Do not read PCIE_MSI_PAYLOAD_REG register for determining MSI interrupt
+number. Since Aardvark already forbids more than 32 interrupts and uses
+own allocated hwirq numbers, the msi_idx already corresponds to the
+received MSI number.
+
+Fixes: 8c39d710363c ("PCI: aardvark: Add Aardvark PCI host controller driver")
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 13 ++++++-------
+ 1 file changed, 6 insertions(+), 7 deletions(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index a573fc1aa4dd..1c6980a78975 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -1391,7 +1391,7 @@ static void advk_pcie_remove_irq_domain(struct advk_pcie *pcie)
+ static void advk_pcie_handle_msi(struct advk_pcie *pcie)
+ {
+ u32 msi_val, msi_mask, msi_status, msi_idx;
+- u16 msi_data;
++ int virq;
+
+ msi_mask = advk_readl(pcie, PCIE_MSI_MASK_REG);
+ msi_val = advk_readl(pcie, PCIE_MSI_STATUS_REG);
+@@ -1401,13 +1401,12 @@ static void advk_pcie_handle_msi(struct advk_pcie *pcie)
+ if (!(BIT(msi_idx) & msi_status))
+ continue;
+
+- /*
+- * msi_idx contains bits [4:0] of the msi_data and msi_data
+- * contains 16bit MSI interrupt number
+- */
+ advk_writel(pcie, BIT(msi_idx), PCIE_MSI_STATUS_REG);
+- msi_data = advk_readl(pcie, PCIE_MSI_PAYLOAD_REG) & PCIE_MSI_DATA_MASK;
+- generic_handle_irq(msi_data);
++ virq = irq_find_mapping(pcie->msi_inner_domain, msi_idx);
++ if (virq)
++ generic_handle_irq(virq);
++ else
++ dev_err_ratelimited(&pcie->pdev->dev, "unexpected MSI 0x%02x\n", msi_idx);
+ }
+
+ advk_writel(pcie, PCIE_ISR0_MSI_INT_PENDING,
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0003-PCI-aardvark-Fix-support-for-MSI-interrupts.patch b/target/linux/generic/pending-5.10/850-0003-PCI-aardvark-Fix-support-for-MSI-interrupts.patch
new file mode 100644
index 00000000000..1735399dc15
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0003-PCI-aardvark-Fix-support-for-MSI-interrupts.patch
@@ -0,0 +1,77 @@
+From bb03b126ea6c9e57177b537dd022246fa5dbef16 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Fri, 12 Feb 2021 16:24:07 +0100
+Subject: [PATCH] PCI: aardvark: Fix support for MSI interrupts
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Aardvark hardware supports Multi-MSI and MSI_FLAG_MULTI_PCI_MSI is already
+set for the MSI chip. But when allocating MSI interrupt numbers for
+Multi-MSI, the numbers need to be properly aligned, otherwise endpoint
+devices send MSI interrupt with incorrect numbers.
+
+Fix this issue by using function bitmap_find_free_region() instead of
+bitmap_find_next_zero_area().
+
+To ensure that aligned MSI interrupt numbers are used by endpoint devices,
+we cannot use Linux virtual irq numbers (as they are random and not
+properly aligned). Instead we need to use the aligned hwirq numbers.
+
+This change fixes receiving MSI interrupts on Armada 3720 boards and
+allows using NVMe disks which use Multi-MSI feature with 3 interrupts.
+
+Without this NVMe disks freeze booting as linux nvme-core.c is waiting
+60s for an interrupt.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 16 ++++++----------
+ 1 file changed, 6 insertions(+), 10 deletions(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index 1c6980a78975..e68773527171 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -1187,7 +1187,7 @@ static void advk_msi_irq_compose_msi_msg(struct irq_data *data,
+
+ msg->address_lo = lower_32_bits(msi_msg);
+ msg->address_hi = upper_32_bits(msi_msg);
+- msg->data = data->irq;
++ msg->data = data->hwirq;
+ }
+
+ static int advk_msi_set_affinity(struct irq_data *irq_data,
+@@ -1204,15 +1204,11 @@ static int advk_msi_irq_domain_alloc(struct irq_domain *domain,
+ int hwirq, i;
+
+ mutex_lock(&pcie->msi_used_lock);
+- hwirq = bitmap_find_next_zero_area(pcie->msi_used, MSI_IRQ_NUM,
+- 0, nr_irqs, 0);
+- if (hwirq >= MSI_IRQ_NUM) {
+- mutex_unlock(&pcie->msi_used_lock);
+- return -ENOSPC;
+- }
+-
+- bitmap_set(pcie->msi_used, hwirq, nr_irqs);
++ hwirq = bitmap_find_free_region(pcie->msi_used, MSI_IRQ_NUM,
++ order_base_2(nr_irqs));
+ mutex_unlock(&pcie->msi_used_lock);
++ if (hwirq < 0)
++ return -ENOSPC;
+
+ for (i = 0; i < nr_irqs; i++)
+ irq_domain_set_info(domain, virq + i, hwirq + i,
+@@ -1230,7 +1226,7 @@ static void advk_msi_irq_domain_free(struct irq_domain *domain,
+ struct advk_pcie *pcie = domain->host_data;
+
+ mutex_lock(&pcie->msi_used_lock);
+- bitmap_clear(pcie->msi_used, d->hwirq, nr_irqs);
++ bitmap_release_region(pcie->msi_used, d->hwirq, order_base_2(nr_irqs));
+ mutex_unlock(&pcie->msi_used_lock);
+ }
+
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0004-PCI-aardvark-Rewrite-IRQ-code-to-chained-IRQ-handler.patch b/target/linux/generic/pending-5.10/850-0004-PCI-aardvark-Rewrite-IRQ-code-to-chained-IRQ-handler.patch
new file mode 100644
index 00000000000..fbed9cc5069
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0004-PCI-aardvark-Rewrite-IRQ-code-to-chained-IRQ-handler.patch
@@ -0,0 +1,130 @@
+From 0cd5141d1866afb23286fe90cd846441fe7aeb39 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Sat, 27 Mar 2021 14:44:11 +0100
+Subject: [PATCH] PCI: aardvark: Rewrite IRQ code to chained IRQ handler
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Rewrite the code to use irq_set_chained_handler_and_data() handler with
+chained_irq_enter() and chained_irq_exit() processing instead of using
+devm_request_irq().
+
+advk_pcie_irq_handler() reads IRQ status bits and calls other functions
+based on which bits are set. These functions then read its own IRQ status
+bits and calls other aardvark functions based on these bits. Finally
+generic_handle_domain_irq() with translated linux IRQ numbers are called.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 48 +++++++++++++++------------
+ 1 file changed, 26 insertions(+), 22 deletions(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index e68773527171..01dfe70d9c2c 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -275,6 +275,7 @@ struct advk_pcie {
+ u32 actions;
+ } wins[OB_WIN_COUNT];
+ u8 wins_count;
++ int irq;
+ struct irq_domain *irq_domain;
+ struct irq_chip irq_chip;
+ raw_spinlock_t irq_lock;
+@@ -1440,21 +1441,26 @@ static void advk_pcie_handle_int(struct advk_pcie *pcie)
+ }
+ }
+
+-static irqreturn_t advk_pcie_irq_handler(int irq, void *arg)
++static void advk_pcie_irq_handler(struct irq_desc *desc)
+ {
+- struct advk_pcie *pcie = arg;
+- u32 status;
++ struct advk_pcie *pcie = irq_desc_get_handler_data(desc);
++ struct irq_chip *chip = irq_desc_get_chip(desc);
++ u32 val, mask, status;
+
+- status = advk_readl(pcie, HOST_CTRL_INT_STATUS_REG);
+- if (!(status & PCIE_IRQ_CORE_INT))
+- return IRQ_NONE;
++ chained_irq_enter(chip, desc);
+
+- advk_pcie_handle_int(pcie);
++ val = advk_readl(pcie, HOST_CTRL_INT_STATUS_REG);
++ mask = advk_readl(pcie, HOST_CTRL_INT_MASK_REG);
++ status = val & ((~mask) & PCIE_IRQ_ALL_MASK);
+
+- /* Clear interrupt */
+- advk_writel(pcie, PCIE_IRQ_CORE_INT, HOST_CTRL_INT_STATUS_REG);
++ if (status & PCIE_IRQ_CORE_INT) {
++ advk_pcie_handle_int(pcie);
+
+- return IRQ_HANDLED;
++ /* Clear interrupt */
++ advk_writel(pcie, PCIE_IRQ_CORE_INT, HOST_CTRL_INT_STATUS_REG);
++ }
++
++ chained_irq_exit(chip, desc);
+ }
+
+ static void __maybe_unused advk_pcie_disable_phy(struct advk_pcie *pcie)
+@@ -1521,7 +1527,7 @@ static int advk_pcie_probe(struct platform_device *pdev)
+ struct advk_pcie *pcie;
+ struct pci_host_bridge *bridge;
+ struct resource_entry *entry;
+- int ret, irq;
++ int ret;
+
+ bridge = devm_pci_alloc_host_bridge(dev, sizeof(struct advk_pcie));
+ if (!bridge)
+@@ -1609,17 +1615,9 @@ static int advk_pcie_probe(struct platform_device *pdev)
+ if (IS_ERR(pcie->base))
+ return PTR_ERR(pcie->base);
+
+- irq = platform_get_irq(pdev, 0);
+- if (irq < 0)
+- return irq;
+-
+- ret = devm_request_irq(dev, irq, advk_pcie_irq_handler,
+- IRQF_SHARED | IRQF_NO_THREAD, "advk-pcie",
+- pcie);
+- if (ret) {
+- dev_err(dev, "Failed to register interrupt\n");
+- return ret;
+- }
++ pcie->irq = platform_get_irq(pdev, 0);
++ if (pcie->irq < 0)
++ return pcie->irq;
+
+ pcie->reset_gpio = devm_gpiod_get_from_of_node(dev, dev->of_node,
+ "reset-gpios", 0,
+@@ -1668,11 +1666,14 @@ static int advk_pcie_probe(struct platform_device *pdev)
+ return ret;
+ }
+
++ irq_set_chained_handler_and_data(pcie->irq, advk_pcie_irq_handler, pcie);
++
+ bridge->sysdata = pcie;
+ bridge->ops = &advk_pcie_ops;
+
+ ret = pci_host_probe(bridge);
+ if (ret < 0) {
++ irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
+ advk_pcie_remove_msi_irq_domain(pcie);
+ advk_pcie_remove_irq_domain(pcie);
+ return ret;
+@@ -1720,6 +1721,9 @@ static int advk_pcie_remove(struct platform_device *pdev)
+ advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_REG);
+ advk_writel(pcie, PCIE_IRQ_ALL_MASK, HOST_CTRL_INT_STATUS_REG);
+
++ /* Remove IRQ handler */
++ irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
++
+ /* Remove IRQ domains */
+ advk_pcie_remove_msi_irq_domain(pcie);
+ advk_pcie_remove_irq_domain(pcie);
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0005-PCI-aardvark-Check-return-value-of-generic_handle_do.patch b/target/linux/generic/pending-5.10/850-0005-PCI-aardvark-Check-return-value-of-generic_handle_do.patch
new file mode 100644
index 00000000000..0428d30f086
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0005-PCI-aardvark-Check-return-value-of-generic_handle_do.patch
@@ -0,0 +1,36 @@
+From 69c1f2c6f45a556361fd8e8d2d4eb20e2c8d3d95 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Thu, 18 Mar 2021 17:04:32 +0100
+Subject: [PATCH] PCI: aardvark: Check return value of
+ generic_handle_domain_irq() when processing INTx IRQ
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+It is possible that we receive spurious INTx interrupt. Check for the
+return value of generic_handle_domain_irq() when processing INTx IRQ.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index 01dfe70d9c2c..4be05b52d835 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -1437,7 +1437,9 @@ static void advk_pcie_handle_int(struct advk_pcie *pcie)
+ PCIE_ISR1_REG);
+
+ virq = irq_find_mapping(pcie->irq_domain, i);
+- generic_handle_irq(virq);
++ if (generic_handle_irq(virq) == -EINVAL)
++ dev_err_ratelimited(&pcie->pdev->dev, "unexpected INT%c IRQ\n",
++ (char)i + 'A');
+ }
+ }
+
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0006-PCI-aardvark-Make-MSI-irq_chip-structures-static-dri.patch b/target/linux/generic/pending-5.10/850-0006-PCI-aardvark-Make-MSI-irq_chip-structures-static-dri.patch
new file mode 100644
index 00000000000..b7d41088936
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0006-PCI-aardvark-Make-MSI-irq_chip-structures-static-dri.patch
@@ -0,0 +1,98 @@
+From 5eb36a6b9508da442aac80f4df23e3951bbfa7aa Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>
+Date: Mon, 10 Jan 2022 00:03:41 +0100
+Subject: [PATCH] PCI: aardvark: Make MSI irq_chip structures static driver
+ structures
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Marc Zyngier says [1] that we should use struct irq_chip as a global
+static struct in the driver. Even though the structure currently
+contains a dynamic member (parent_device), Marc says [2] that he plans
+to kill it and make the structure completely static.
+
+Convert Aardvark's priv->msi_bottom_irq_chip and priv->msi_irq_chip to
+static driver structure.
+
+[1] https://lore.kernel.org/linux-pci/877dbcvngf.wl-maz@kernel.org/
+[2] https://lore.kernel.org/linux-pci/874k6gvkhz.wl-maz@kernel.org/
+
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 26 ++++++++++++--------------
+ 1 file changed, 12 insertions(+), 14 deletions(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index 4be05b52d835..c7bd6b123857 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -281,8 +281,6 @@ struct advk_pcie {
+ raw_spinlock_t irq_lock;
+ struct irq_domain *msi_domain;
+ struct irq_domain *msi_inner_domain;
+- struct irq_chip msi_bottom_irq_chip;
+- struct irq_chip msi_irq_chip;
+ struct msi_domain_info msi_domain_info;
+ DECLARE_BITMAP(msi_used, MSI_IRQ_NUM);
+ struct mutex msi_used_lock;
+@@ -1197,6 +1195,12 @@ static int advk_msi_set_affinity(struct irq_data *irq_data,
+ return -EINVAL;
+ }
+
++static struct irq_chip advk_msi_bottom_irq_chip = {
++ .name = "MSI",
++ .irq_compose_msi_msg = advk_msi_irq_compose_msi_msg,
++ .irq_set_affinity = advk_msi_set_affinity,
++};
++
+ static int advk_msi_irq_domain_alloc(struct irq_domain *domain,
+ unsigned int virq,
+ unsigned int nr_irqs, void *args)
+@@ -1213,7 +1217,7 @@ static int advk_msi_irq_domain_alloc(struct irq_domain *domain,
+
+ for (i = 0; i < nr_irqs; i++)
+ irq_domain_set_info(domain, virq + i, hwirq + i,
+- &pcie->msi_bottom_irq_chip,
++ &advk_msi_bottom_irq_chip,
+ domain->host_data, handle_simple_irq,
+ NULL, NULL);
+
+@@ -1283,29 +1287,23 @@ static const struct irq_domain_ops advk_pcie_irq_domain_ops = {
+ .xlate = irq_domain_xlate_onecell,
+ };
+
++static struct irq_chip advk_msi_irq_chip = {
++ .name = "advk-MSI",
++};
++
+ static int advk_pcie_init_msi_irq_domain(struct advk_pcie *pcie)
+ {
+ struct device *dev = &pcie->pdev->dev;
+ struct device_node *node = dev->of_node;
+- struct irq_chip *bottom_ic, *msi_ic;
+ struct msi_domain_info *msi_di;
+ phys_addr_t msi_msg_phys;
+
+ mutex_init(&pcie->msi_used_lock);
+
+- bottom_ic = &pcie->msi_bottom_irq_chip;
+-
+- bottom_ic->name = "MSI";
+- bottom_ic->irq_compose_msi_msg = advk_msi_irq_compose_msi_msg;
+- bottom_ic->irq_set_affinity = advk_msi_set_affinity;
+-
+- msi_ic = &pcie->msi_irq_chip;
+- msi_ic->name = "advk-MSI";
+-
+ msi_di = &pcie->msi_domain_info;
+ msi_di->flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+ MSI_FLAG_MULTI_PCI_MSI;
+- msi_di->chip = msi_ic;
++ msi_di->chip = &advk_msi_irq_chip;
+
+ msi_msg_phys = virt_to_phys(&pcie->msi_msg);
+
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0007-PCI-aardvark-Make-msi_domain_info-structure-a-static.patch b/target/linux/generic/pending-5.10/850-0007-PCI-aardvark-Make-msi_domain_info-structure-a-static.patch
new file mode 100644
index 00000000000..e388bc2ea78
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0007-PCI-aardvark-Make-msi_domain_info-structure-a-static.patch
@@ -0,0 +1,69 @@
+From c092ab8994f1f777054c0179a9deb40b87ee606f Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>
+Date: Mon, 10 Jan 2022 00:10:46 +0100
+Subject: [PATCH] PCI: aardvark: Make msi_domain_info structure a static driver
+ structure
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Make Aardvark's msi_domain_info structure into a private driver structure.
+Domain info is same for every potential instatination of a controller.
+
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 16 ++++++++--------
+ 1 file changed, 8 insertions(+), 8 deletions(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index c7bd6b123857..b5e5c922ad0d 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -281,7 +281,6 @@ struct advk_pcie {
+ raw_spinlock_t irq_lock;
+ struct irq_domain *msi_domain;
+ struct irq_domain *msi_inner_domain;
+- struct msi_domain_info msi_domain_info;
+ DECLARE_BITMAP(msi_used, MSI_IRQ_NUM);
+ struct mutex msi_used_lock;
+ u16 msi_msg;
+@@ -1291,20 +1290,20 @@ static struct irq_chip advk_msi_irq_chip = {
+ .name = "advk-MSI",
+ };
+
++static struct msi_domain_info advk_msi_domain_info = {
++ .flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
++ MSI_FLAG_MULTI_PCI_MSI,
++ .chip = &advk_msi_irq_chip,
++};
++
+ static int advk_pcie_init_msi_irq_domain(struct advk_pcie *pcie)
+ {
+ struct device *dev = &pcie->pdev->dev;
+ struct device_node *node = dev->of_node;
+- struct msi_domain_info *msi_di;
+ phys_addr_t msi_msg_phys;
+
+ mutex_init(&pcie->msi_used_lock);
+
+- msi_di = &pcie->msi_domain_info;
+- msi_di->flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+- MSI_FLAG_MULTI_PCI_MSI;
+- msi_di->chip = &advk_msi_irq_chip;
+-
+ msi_msg_phys = virt_to_phys(&pcie->msi_msg);
+
+ advk_writel(pcie, lower_32_bits(msi_msg_phys),
+@@ -1320,7 +1319,8 @@ static int advk_pcie_init_msi_irq_domain(struct advk_pcie *pcie)
+
+ pcie->msi_domain =
+ pci_msi_create_irq_domain(of_node_to_fwnode(node),
+- msi_di, pcie->msi_inner_domain);
++ &advk_msi_domain_info,
++ pcie->msi_inner_domain);
+ if (!pcie->msi_domain) {
+ irq_domain_remove(pcie->msi_inner_domain);
+ return -ENOMEM;
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0008-PCI-aardvark-Use-dev_fwnode-instead-of-of_node_to_fw.patch b/target/linux/generic/pending-5.10/850-0008-PCI-aardvark-Use-dev_fwnode-instead-of-of_node_to_fw.patch
new file mode 100644
index 00000000000..baba1744c26
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0008-PCI-aardvark-Use-dev_fwnode-instead-of-of_node_to_fw.patch
@@ -0,0 +1,45 @@
+From 59029739d42b439628e2f64f3d8f2db9be97deff Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>
+Date: Mon, 10 Jan 2022 00:15:17 +0100
+Subject: [PATCH] PCI: aardvark: Use dev_fwnode() instead of
+ of_node_to_fwnode(dev->of_node)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Use simple
+ dev_fwnode(dev)
+instead of
+ struct device_node *node = dev->of_node;
+ of_node_to_fwnode(node)
+especially since the node variable is not used elsewhere in the function.
+
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 3 +--
+ 1 file changed, 1 insertion(+), 2 deletions(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index b5e5c922ad0d..e641ad566488 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -1299,7 +1299,6 @@ static struct msi_domain_info advk_msi_domain_info = {
+ static int advk_pcie_init_msi_irq_domain(struct advk_pcie *pcie)
+ {
+ struct device *dev = &pcie->pdev->dev;
+- struct device_node *node = dev->of_node;
+ phys_addr_t msi_msg_phys;
+
+ mutex_init(&pcie->msi_used_lock);
+@@ -1318,7 +1317,7 @@ static int advk_pcie_init_msi_irq_domain(struct advk_pcie *pcie)
+ return -ENOMEM;
+
+ pcie->msi_domain =
+- pci_msi_create_irq_domain(of_node_to_fwnode(node),
++ pci_msi_create_irq_domain(dev_fwnode(dev),
+ &advk_msi_domain_info,
+ pcie->msi_inner_domain);
+ if (!pcie->msi_domain) {
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0009-PCI-aardvark-Refactor-unmasking-summary-MSI-interrup.patch b/target/linux/generic/pending-5.10/850-0009-PCI-aardvark-Refactor-unmasking-summary-MSI-interrup.patch
new file mode 100644
index 00000000000..8189f0b1f1e
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0009-PCI-aardvark-Refactor-unmasking-summary-MSI-interrup.patch
@@ -0,0 +1,49 @@
+From 98feaf97bc64fc640a6c5b1394cd18fc7cd7dac8 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Sun, 28 Mar 2021 14:34:49 +0200
+Subject: [PATCH] PCI: aardvark: Refactor unmasking summary MSI interrupt
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Refactor the masking of ISR0/1 Sources and unmasking of summary MSI interrupt
+so that it corresponds to the comments:
+- first mask all ISR0/1
+- then unmask all MSIs
+- then unmask summary MSI interrupt
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 10 ++++++----
+ 1 file changed, 6 insertions(+), 4 deletions(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index e641ad566488..5c887772fa97 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -578,15 +578,17 @@ static void advk_pcie_setup_hw(struct advk_pcie *pcie)
+ advk_writel(pcie, PCIE_IRQ_ALL_MASK, HOST_CTRL_INT_STATUS_REG);
+
+ /* Disable All ISR0/1 Sources */
+- reg = PCIE_ISR0_ALL_MASK;
+- reg &= ~PCIE_ISR0_MSI_INT_PENDING;
+- advk_writel(pcie, reg, PCIE_ISR0_MASK_REG);
+-
++ advk_writel(pcie, PCIE_ISR0_ALL_MASK, PCIE_ISR0_MASK_REG);
+ advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_MASK_REG);
+
+ /* Unmask all MSIs */
+ advk_writel(pcie, ~(u32)PCIE_MSI_ALL_MASK, PCIE_MSI_MASK_REG);
+
++ /* Unmask summary MSI interrupt */
++ reg = advk_readl(pcie, PCIE_ISR0_MASK_REG);
++ reg &= ~PCIE_ISR0_MSI_INT_PENDING;
++ advk_writel(pcie, reg, PCIE_ISR0_MASK_REG);
++
+ /* Enable summary interrupt for GIC SPI source */
+ reg = PCIE_IRQ_ALL_MASK & (~PCIE_IRQ_ENABLE_INTS_MASK);
+ advk_writel(pcie, reg, HOST_CTRL_INT_MASK_REG);
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0010-PCI-aardvark-Add-support-for-masking-MSI-interrupts.patch b/target/linux/generic/pending-5.10/850-0010-PCI-aardvark-Add-support-for-masking-MSI-interrupts.patch
new file mode 100644
index 00000000000..cdd76eed1ca
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0010-PCI-aardvark-Add-support-for-masking-MSI-interrupts.patch
@@ -0,0 +1,122 @@
+From 7f353accca6e4a3222991c65b1a6801503973bd3 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Fri, 2 Jul 2021 16:44:10 +0200
+Subject: [PATCH] PCI: aardvark: Add support for masking MSI interrupts
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+We should not unmask MSIs at setup, but only when kernel asks for them
+to be unmasked.
+
+At setup, mask all MSIs, and implement IRQ chip callbacks for masking
+and unmasking particular MSIs.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 54 ++++++++++++++++++++++++---
+ 1 file changed, 49 insertions(+), 5 deletions(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index 5c887772fa97..43db884c81a1 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -281,6 +281,7 @@ struct advk_pcie {
+ raw_spinlock_t irq_lock;
+ struct irq_domain *msi_domain;
+ struct irq_domain *msi_inner_domain;
++ raw_spinlock_t msi_irq_lock;
+ DECLARE_BITMAP(msi_used, MSI_IRQ_NUM);
+ struct mutex msi_used_lock;
+ u16 msi_msg;
+@@ -577,12 +578,10 @@ static void advk_pcie_setup_hw(struct advk_pcie *pcie)
+ advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_REG);
+ advk_writel(pcie, PCIE_IRQ_ALL_MASK, HOST_CTRL_INT_STATUS_REG);
+
+- /* Disable All ISR0/1 Sources */
++ /* Disable All ISR0/1 and MSI Sources */
+ advk_writel(pcie, PCIE_ISR0_ALL_MASK, PCIE_ISR0_MASK_REG);
+ advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_MASK_REG);
+-
+- /* Unmask all MSIs */
+- advk_writel(pcie, ~(u32)PCIE_MSI_ALL_MASK, PCIE_MSI_MASK_REG);
++ advk_writel(pcie, PCIE_MSI_ALL_MASK, PCIE_MSI_MASK_REG);
+
+ /* Unmask summary MSI interrupt */
+ reg = advk_readl(pcie, PCIE_ISR0_MASK_REG);
+@@ -1196,10 +1195,52 @@ static int advk_msi_set_affinity(struct irq_data *irq_data,
+ return -EINVAL;
+ }
+
++static void advk_msi_irq_mask(struct irq_data *d)
++{
++ struct advk_pcie *pcie = d->domain->host_data;
++ irq_hw_number_t hwirq = irqd_to_hwirq(d);
++ unsigned long flags;
++ u32 mask;
++
++ raw_spin_lock_irqsave(&pcie->msi_irq_lock, flags);
++ mask = advk_readl(pcie, PCIE_MSI_MASK_REG);
++ mask |= BIT(hwirq);
++ advk_writel(pcie, mask, PCIE_MSI_MASK_REG);
++ raw_spin_unlock_irqrestore(&pcie->msi_irq_lock, flags);
++}
++
++static void advk_msi_irq_unmask(struct irq_data *d)
++{
++ struct advk_pcie *pcie = d->domain->host_data;
++ irq_hw_number_t hwirq = irqd_to_hwirq(d);
++ unsigned long flags;
++ u32 mask;
++
++ raw_spin_lock_irqsave(&pcie->msi_irq_lock, flags);
++ mask = advk_readl(pcie, PCIE_MSI_MASK_REG);
++ mask &= ~BIT(hwirq);
++ advk_writel(pcie, mask, PCIE_MSI_MASK_REG);
++ raw_spin_unlock_irqrestore(&pcie->msi_irq_lock, flags);
++}
++
++static void advk_msi_top_irq_mask(struct irq_data *d)
++{
++ pci_msi_mask_irq(d);
++ irq_chip_mask_parent(d);
++}
++
++static void advk_msi_top_irq_unmask(struct irq_data *d)
++{
++ pci_msi_unmask_irq(d);
++ irq_chip_unmask_parent(d);
++}
++
+ static struct irq_chip advk_msi_bottom_irq_chip = {
+ .name = "MSI",
+ .irq_compose_msi_msg = advk_msi_irq_compose_msi_msg,
+ .irq_set_affinity = advk_msi_set_affinity,
++ .irq_mask = advk_msi_irq_mask,
++ .irq_unmask = advk_msi_irq_unmask,
+ };
+
+ static int advk_msi_irq_domain_alloc(struct irq_domain *domain,
+@@ -1289,7 +1330,9 @@ static const struct irq_domain_ops advk_pcie_irq_domain_ops = {
+ };
+
+ static struct irq_chip advk_msi_irq_chip = {
+- .name = "advk-MSI",
++ .name = "advk-MSI",
++ .irq_mask = advk_msi_top_irq_mask,
++ .irq_unmask = advk_msi_top_irq_unmask,
+ };
+
+ static struct msi_domain_info advk_msi_domain_info = {
+@@ -1303,6 +1346,7 @@ static int advk_pcie_init_msi_irq_domain(struct advk_pcie *pcie)
+ struct device *dev = &pcie->pdev->dev;
+ phys_addr_t msi_msg_phys;
+
++ raw_spin_lock_init(&pcie->msi_irq_lock);
+ mutex_init(&pcie->msi_used_lock);
+
+ msi_msg_phys = virt_to_phys(&pcie->msi_msg);
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0011-PCI-aardvark-Fix-setting-MSI-address.patch b/target/linux/generic/pending-5.10/850-0011-PCI-aardvark-Fix-setting-MSI-address.patch
new file mode 100644
index 00000000000..083b93f4202
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0011-PCI-aardvark-Fix-setting-MSI-address.patch
@@ -0,0 +1,96 @@
+From fa73c200f181436eab859374657c53a73778d8ad Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Fri, 26 Mar 2021 17:35:44 +0100
+Subject: [PATCH] PCI: aardvark: Fix setting MSI address
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+MSI address for receiving MSI interrupts needs to be correctly set before
+enabling processing of MSI interrupts.
+
+Move code for setting PCIE_MSI_ADDR_LOW_REG and PCIE_MSI_ADDR_HIGH_REG
+from advk_pcie_init_msi_irq_domain() to advk_pcie_setup_hw(), before
+enabling PCIE_CORE_CTRL2_MSI_ENABLE.
+
+After this we can remove the now unused member msi_msg, which was used
+only for MSI doorbell address. MSI address can be any address which cannot
+be used to DMA to. So change it to the address of the main struct advk_pcie.
+
+Fixes: 8c39d710363c ("PCI: aardvark: Add Aardvark PCI host controller driver")
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Acked-by: Marc Zyngier <maz@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+Cc: stable@vger.kernel.org # f21a8b1b6837 ("PCI: aardvark: Move to MSI handling using generic MSI support")
+---
+ drivers/pci/controller/pci-aardvark.c | 21 +++++++++------------
+ 1 file changed, 9 insertions(+), 12 deletions(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index 43db884c81a1..76a65c592b5c 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -284,7 +284,6 @@ struct advk_pcie {
+ raw_spinlock_t msi_irq_lock;
+ DECLARE_BITMAP(msi_used, MSI_IRQ_NUM);
+ struct mutex msi_used_lock;
+- u16 msi_msg;
+ int link_gen;
+ struct pci_bridge_emul bridge;
+ struct gpio_desc *reset_gpio;
+@@ -479,6 +478,7 @@ static void advk_pcie_disable_ob_win(struct advk_pcie *pcie, u8 win_num)
+
+ static void advk_pcie_setup_hw(struct advk_pcie *pcie)
+ {
++ phys_addr_t msi_addr;
+ u32 reg;
+ int i;
+
+@@ -567,6 +567,11 @@ static void advk_pcie_setup_hw(struct advk_pcie *pcie)
+ reg |= LANE_COUNT_1;
+ advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
+
++ /* Set MSI address */
++ msi_addr = virt_to_phys(pcie);
++ advk_writel(pcie, lower_32_bits(msi_addr), PCIE_MSI_ADDR_LOW_REG);
++ advk_writel(pcie, upper_32_bits(msi_addr), PCIE_MSI_ADDR_HIGH_REG);
++
+ /* Enable MSI */
+ reg = advk_readl(pcie, PCIE_CORE_CTRL2_REG);
+ reg |= PCIE_CORE_CTRL2_MSI_ENABLE;
+@@ -1182,10 +1187,10 @@ static void advk_msi_irq_compose_msi_msg(struct irq_data *data,
+ struct msi_msg *msg)
+ {
+ struct advk_pcie *pcie = irq_data_get_irq_chip_data(data);
+- phys_addr_t msi_msg = virt_to_phys(&pcie->msi_msg);
++ phys_addr_t msi_addr = virt_to_phys(pcie);
+
+- msg->address_lo = lower_32_bits(msi_msg);
+- msg->address_hi = upper_32_bits(msi_msg);
++ msg->address_lo = lower_32_bits(msi_addr);
++ msg->address_hi = upper_32_bits(msi_addr);
+ msg->data = data->hwirq;
+ }
+
+@@ -1344,18 +1349,10 @@ static struct msi_domain_info advk_msi_domain_info = {
+ static int advk_pcie_init_msi_irq_domain(struct advk_pcie *pcie)
+ {
+ struct device *dev = &pcie->pdev->dev;
+- phys_addr_t msi_msg_phys;
+
+ raw_spin_lock_init(&pcie->msi_irq_lock);
+ mutex_init(&pcie->msi_used_lock);
+
+- msi_msg_phys = virt_to_phys(&pcie->msi_msg);
+-
+- advk_writel(pcie, lower_32_bits(msi_msg_phys),
+- PCIE_MSI_ADDR_LOW_REG);
+- advk_writel(pcie, upper_32_bits(msi_msg_phys),
+- PCIE_MSI_ADDR_HIGH_REG);
+-
+ pcie->msi_inner_domain =
+ irq_domain_add_linear(NULL, MSI_IRQ_NUM,
+ &advk_msi_domain_ops, pcie);
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0012-PCI-aardvark-Enable-MSI-X-support.patch b/target/linux/generic/pending-5.10/850-0012-PCI-aardvark-Enable-MSI-X-support.patch
new file mode 100644
index 00000000000..d5d40054452
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0012-PCI-aardvark-Enable-MSI-X-support.patch
@@ -0,0 +1,43 @@
+From 735a4ac9782b96fbe1543c578aa8334364f21abd Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Fri, 2 Apr 2021 14:05:24 +0200
+Subject: [PATCH] PCI: aardvark: Enable MSI-X support
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+According to PCI 3.0 specification, sending both MSI and MSI-X interrupts
+is done by DWORD memory write operation to doorbell message address. The
+write operation for MSI has zero upper 16 bits and the MSI interrupt number
+in the lower 16 bits, while the write operation for MSI-X contains a 32-bit
+value from MSI-X table.
+
+Since the driver only uses interrupt numbers from range 0..31, the upper
+16 bits of the DWORD memory write operation to doorbell message address
+are zero even for MSI-X interrupts. Thus we can enable MSI-X interrupts.
+
+Testing proves that kernel can correctly receive MSI-X interrupts from PCIe
+cards which supports both MSI and MSI-X interrupts.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index 76a65c592b5c..e6cfee3b41a2 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -1342,7 +1342,7 @@ static struct irq_chip advk_msi_irq_chip = {
+
+ static struct msi_domain_info advk_msi_domain_info = {
+ .flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+- MSI_FLAG_MULTI_PCI_MSI,
++ MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX,
+ .chip = &advk_msi_irq_chip,
+ };
+
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0013-PCI-aardvark-Add-support-for-ERR-interrupt-on-emulat.patch b/target/linux/generic/pending-5.10/850-0013-PCI-aardvark-Add-support-for-ERR-interrupt-on-emulat.patch
new file mode 100644
index 00000000000..9b15b7917e7
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0013-PCI-aardvark-Add-support-for-ERR-interrupt-on-emulat.patch
@@ -0,0 +1,105 @@
+From 7f3e55a3890fa26d15e2e4e90213962d1a7f6df9 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Fri, 12 Feb 2021 20:32:55 +0100
+Subject: [PATCH] PCI: aardvark: Add support for ERR interrupt on emulated
+ bridge
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+ERR interrupt is triggered when corresponding bit is unmasked in both ISR0
+and PCI_EXP_DEVCTL registers. Unmasking ERR bits in PCI_EXP_DEVCTL register
+is not enough. This means that currently the ERR interrupt is never
+triggered.
+
+Unmask ERR bits in ISR0 register at driver probe time. ERR interrupt is not
+triggered until ERR bits are unmasked also in PCI_EXP_DEVCTL register,
+which is done by AER driver. So it is safe to unconditionally unmask all
+ERR bits in aardvark probe.
+
+Aardvark HW sets PCI_ERR_ROOT_AER_IRQ to zero and when corresponding bits
+in ISR0 and PCI_EXP_DEVCTL are enabled, the HW triggers a generic interrupt
+on GIC. Chain this interrupt to PCIe interrupt 0 with
+generic_handle_domain_irq() to allow processing of ERR interrupts.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 36 ++++++++++++++++++++++++++-
+ 1 file changed, 35 insertions(+), 1 deletion(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index e6cfee3b41a2..7956b103d3c7 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -97,6 +97,10 @@
+ #define PCIE_MSG_PM_PME_MASK BIT(7)
+ #define PCIE_ISR0_MASK_REG (CONTROL_BASE_ADDR + 0x44)
+ #define PCIE_ISR0_MSI_INT_PENDING BIT(24)
++#define PCIE_ISR0_CORR_ERR BIT(11)
++#define PCIE_ISR0_NFAT_ERR BIT(12)
++#define PCIE_ISR0_FAT_ERR BIT(13)
++#define PCIE_ISR0_ERR_MASK GENMASK(13, 11)
+ #define PCIE_ISR0_INTX_ASSERT(val) BIT(16 + (val))
+ #define PCIE_ISR0_INTX_DEASSERT(val) BIT(20 + (val))
+ #define PCIE_ISR0_ALL_MASK GENMASK(31, 0)
+@@ -785,11 +789,15 @@ advk_pci_bridge_emul_base_conf_read(struct pci_bridge_emul *bridge,
+ case PCI_INTERRUPT_LINE: {
+ /*
+ * From the whole 32bit register we support reading from HW only
+- * one bit: PCI_BRIDGE_CTL_BUS_RESET.
++ * two bits: PCI_BRIDGE_CTL_BUS_RESET and PCI_BRIDGE_CTL_SERR.
+ * Other bits are retrieved only from emulated config buffer.
+ */
+ __le32 *cfgspace = (__le32 *)&bridge->conf;
+ u32 val = le32_to_cpu(cfgspace[PCI_INTERRUPT_LINE / 4]);
++ if (advk_readl(pcie, PCIE_ISR0_MASK_REG) & PCIE_ISR0_ERR_MASK)
++ val &= ~(PCI_BRIDGE_CTL_SERR << 16);
++ else
++ val |= PCI_BRIDGE_CTL_SERR << 16;
+ if (advk_readl(pcie, PCIE_CORE_CTRL1_REG) & HOT_RESET_GEN)
+ val |= PCI_BRIDGE_CTL_BUS_RESET << 16;
+ else
+@@ -815,6 +823,19 @@ advk_pci_bridge_emul_base_conf_write(struct pci_bridge_emul *bridge,
+ break;
+
+ case PCI_INTERRUPT_LINE:
++ /*
++ * According to Figure 6-3: Pseudo Logic Diagram for Error
++ * Message Controls in PCIe base specification, SERR# Enable bit
++ * in Bridge Control register enable receiving of ERR_* messages
++ */
++ if (mask & (PCI_BRIDGE_CTL_SERR << 16)) {
++ u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG);
++ if (new & (PCI_BRIDGE_CTL_SERR << 16))
++ val &= ~PCIE_ISR0_ERR_MASK;
++ else
++ val |= PCIE_ISR0_ERR_MASK;
++ advk_writel(pcie, val, PCIE_ISR0_MASK_REG);
++ }
+ if (mask & (PCI_BRIDGE_CTL_BUS_RESET << 16)) {
+ u32 val = advk_readl(pcie, PCIE_CORE_CTRL1_REG);
+ if (new & (PCI_BRIDGE_CTL_BUS_RESET << 16))
+@@ -1464,6 +1485,19 @@ static void advk_pcie_handle_int(struct advk_pcie *pcie)
+ isr1_mask = advk_readl(pcie, PCIE_ISR1_MASK_REG);
+ isr1_status = isr1_val & ((~isr1_mask) & PCIE_ISR1_ALL_MASK);
+
++ /* Process ERR interrupt */
++ if (isr0_status & PCIE_ISR0_ERR_MASK) {
++ advk_writel(pcie, PCIE_ISR0_ERR_MASK, PCIE_ISR0_REG);
++
++ /*
++ * Aardvark HW returns zero for PCI_ERR_ROOT_AER_IRQ, so use
++ * PCIe interrupt 0
++ */
++ virq = irq_find_mapping(pcie->irq_domain, 0);
++ if (generic_handle_irq(virq) == -EINVAL)
++ dev_err_ratelimited(&pcie->pdev->dev, "unhandled ERR IRQ\n");
++ }
++
+ /* Process MSI interrupts */
+ if (isr0_status & PCIE_ISR0_MSI_INT_PENDING)
+ advk_pcie_handle_msi(pcie);
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0014-PCI-aardvark-Fix-reading-PCI_EXP_RTSTA_PME-bit-on-em.patch b/target/linux/generic/pending-5.10/850-0014-PCI-aardvark-Fix-reading-PCI_EXP_RTSTA_PME-bit-on-em.patch
new file mode 100644
index 00000000000..5b0d7b341a6
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0014-PCI-aardvark-Fix-reading-PCI_EXP_RTSTA_PME-bit-on-em.patch
@@ -0,0 +1,49 @@
+From 5f354992eeef9a51c67796dc9f7f578d3584baa2 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Wed, 8 Dec 2021 05:57:54 +0100
+Subject: [PATCH] PCI: aardvark: Fix reading PCI_EXP_RTSTA_PME bit on emulated
+ bridge
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+The emulated bridge returns incorrect value for PCI_EXP_RTSTA register
+during readout in advk_pci_bridge_emul_pcie_conf_read() function: the
+correct bit is BIT(16), but we are setting BIT(23), because the code
+does
+ *value = (isr0 & PCIE_MSG_PM_PME_MASK) << 16
+where
+ PCIE_MSG_PM_PME_MASK
+is
+ BIT(7).
+
+The code should probably have been something like
+ *value = (!!(isr0 & PCIE_MSG_PM_PME_MASK)) << 16,
+but we are better of using an if() and using the proper macro for this
+bit.
+
+Fixes: 8a3ebd8de328 ("PCI: aardvark: Implement emulated root PCI bridge config space")
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index 7956b103d3c7..44d9c8c4d258 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -874,7 +874,9 @@ advk_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
+ case PCI_EXP_RTSTA: {
+ u32 isr0 = advk_readl(pcie, PCIE_ISR0_REG);
+ u32 msglog = advk_readl(pcie, PCIE_MSG_LOG_REG);
+- *value = (isr0 & PCIE_MSG_PM_PME_MASK) << 16 | (msglog >> 16);
++ *value = msglog >> 16;
++ if (isr0 & PCIE_MSG_PM_PME_MASK)
++ *value |= PCI_EXP_RTSTA_PME;
+ return PCI_BRIDGE_EMUL_HANDLED;
+ }
+
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0015-PCI-aardvark-Optimize-writing-PCI_EXP_RTCTL_PMEIE-an.patch b/target/linux/generic/pending-5.10/850-0015-PCI-aardvark-Optimize-writing-PCI_EXP_RTCTL_PMEIE-an.patch
new file mode 100644
index 00000000000..52af732c445
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0015-PCI-aardvark-Optimize-writing-PCI_EXP_RTCTL_PMEIE-an.patch
@@ -0,0 +1,57 @@
+From 3fe0073d116d9902df08761c1cf0d733dd4c38fc Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Wed, 8 Dec 2021 06:03:50 +0100
+Subject: [PATCH] PCI: aardvark: Optimize writing PCI_EXP_RTCTL_PMEIE and
+ PCI_EXP_RTSTA_PME on emulated bridge
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+To optimize advk_pci_bridge_emul_pcie_conf_write() code, touch
+PCIE_ISR0_REG and PCIE_ISR0_MASK_REG registers only when it is really
+needed, when processing PCI_EXP_RTCTL_PMEIE and PCI_EXP_RTSTA_PME bits.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 20 +++++++++++---------
+ 1 file changed, 11 insertions(+), 9 deletions(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index 44d9c8c4d258..efd7e53b5e06 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -933,19 +933,21 @@ advk_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge,
+ advk_pcie_wait_for_retrain(pcie);
+ break;
+
+- case PCI_EXP_RTCTL: {
++ case PCI_EXP_RTCTL:
+ /* Only mask/unmask PME interrupt */
+- u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG) &
+- ~PCIE_MSG_PM_PME_MASK;
+- if ((new & PCI_EXP_RTCTL_PMEIE) == 0)
+- val |= PCIE_MSG_PM_PME_MASK;
+- advk_writel(pcie, val, PCIE_ISR0_MASK_REG);
++ if (mask & PCI_EXP_RTCTL_PMEIE) {
++ u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG);
++ if (new & PCI_EXP_RTCTL_PMEIE)
++ val &= ~PCIE_MSG_PM_PME_MASK;
++ else
++ val |= PCIE_MSG_PM_PME_MASK;
++ advk_writel(pcie, val, PCIE_ISR0_MASK_REG);
++ }
+ break;
+- }
+
+ case PCI_EXP_RTSTA:
+- new = (new & PCI_EXP_RTSTA_PME) >> 9;
+- advk_writel(pcie, new, PCIE_ISR0_REG);
++ if (new & PCI_EXP_RTSTA_PME)
++ advk_writel(pcie, PCIE_MSG_PM_PME_MASK, PCIE_ISR0_REG);
+ break;
+
+ case PCI_EXP_DEVCTL:
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0016-PCI-aardvark-Add-support-for-PME-interrupts.patch b/target/linux/generic/pending-5.10/850-0016-PCI-aardvark-Add-support-for-PME-interrupts.patch
new file mode 100644
index 00000000000..76ed7e60a4e
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0016-PCI-aardvark-Add-support-for-PME-interrupts.patch
@@ -0,0 +1,52 @@
+From 7acd8ef92e8789e10b5d736d73cea3b625087f26 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Wed, 8 Dec 2021 06:07:44 +0100
+Subject: [PATCH] PCI: aardvark: Add support for PME interrupts
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Currently enabling PCI_EXP_RTSTA_PME bit in PCI_EXP_RTCTL register does
+nothing. This is because PCIe PME driver expects to receive PCIe interrupt
+defined in PCI_EXP_FLAGS_IRQ register, but aardvark hardware does not
+trigger PCIe INTx/MSI interrupt for PME event, rather it triggers custom
+aardvark interrupt which this driver is not processing yet.
+
+Fix this issue by handling PME interrupt in advk_pcie_handle_int() and
+chaining it to PCIe interrupt 0 with generic_handle_domain_irq() (since
+aardvark sets PCI_EXP_FLAGS_IRQ to zero). With this change PCIe PME driver
+finally starts receiving PME interrupt.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 13 +++++++++++++
+ 1 file changed, 13 insertions(+)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index efd7e53b5e06..e2b66b0e8fb3 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -1489,6 +1489,19 @@ static void advk_pcie_handle_int(struct advk_pcie *pcie)
+ isr1_mask = advk_readl(pcie, PCIE_ISR1_MASK_REG);
+ isr1_status = isr1_val & ((~isr1_mask) & PCIE_ISR1_ALL_MASK);
+
++ /* Process PME interrupt */
++ if (isr0_status & PCIE_MSG_PM_PME_MASK) {
++ /*
++ * Do not clear PME interrupt bit in ISR0, it is cleared by IRQ
++ * receiver by writing to the PCI_EXP_RTSTA register of emulated
++ * root bridge. Aardvark HW returns zero for PCI_EXP_FLAGS_IRQ,
++ * so use PCIe interrupt 0.
++ */
++ virq = irq_find_mapping(pcie->irq_domain, 0);
++ if (generic_handle_irq(virq) == -EINVAL)
++ dev_err_ratelimited(&pcie->pdev->dev, "unhandled PME IRQ\n");
++ }
++
+ /* Process ERR interrupt */
+ if (isr0_status & PCIE_ISR0_ERR_MASK) {
+ advk_writel(pcie, PCIE_ISR0_ERR_MASK, PCIE_ISR0_REG);
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0017-PCI-aardvark-Fix-support-for-PME-requester-on-emulat.patch b/target/linux/generic/pending-5.10/850-0017-PCI-aardvark-Fix-support-for-PME-requester-on-emulat.patch
new file mode 100644
index 00000000000..692d4ee5557
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0017-PCI-aardvark-Fix-support-for-PME-requester-on-emulat.patch
@@ -0,0 +1,178 @@
+From 68727b545332327b4c2f9c0f8d006be8970e7832 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Fri, 19 Feb 2021 14:22:22 +0100
+Subject: [PATCH] PCI: aardvark: Fix support for PME requester on emulated
+ bridge
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Enable aardvark PME interrupt unconditionally by unmasking it and read PME
+requester ID to emulated bridge config space immediately after receiving
+interrupt.
+
+PME requester ID is stored in the PCIE_MSG_LOG_REG register, which contains
+the last inbound message. So when new inbound message is received by HW
+(including non-PM), the content in PCIE_MSG_LOG_REG register is replaced by
+a new value.
+
+PCIe specification mandates that subsequent PMEs are kept pending until the
+PME Status Register bit is cleared by software by writing a 1b.
+
+Support for masking/unmasking PME interrupt on emulated bridge via
+PCI_EXP_RTCTL_PMEIE bit is now implemented only in emulated bridge config
+space, to ensure that we do not miss any aardvark PME interrupt.
+
+Reading of PCI_EXP_RTCAP and PCI_EXP_RTSTA registers is simplified as final
+value is now always stored into emulated bridge config space by the
+interrupt handler, so there is no need to implement support for these
+registers in read_pcie callback.
+
+Clearing of W1C bit PCI_EXP_RTSTA_PME is now also simplified as it is done
+by pci-bridge-emul.c code for emulated bridge config space. So there is no
+need to implement support for clearing this bit in write_pcie callback.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 94 +++++++++++++++------------
+ 1 file changed, 52 insertions(+), 42 deletions(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index e2b66b0e8fb3..85a632537b70 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -597,6 +597,11 @@ static void advk_pcie_setup_hw(struct advk_pcie *pcie)
+ reg &= ~PCIE_ISR0_MSI_INT_PENDING;
+ advk_writel(pcie, reg, PCIE_ISR0_MASK_REG);
+
++ /* Unmask PME interrupt for processing of PME requester */
++ reg = advk_readl(pcie, PCIE_ISR0_MASK_REG);
++ reg &= ~PCIE_MSG_PM_PME_MASK;
++ advk_writel(pcie, reg, PCIE_ISR0_MASK_REG);
++
+ /* Enable summary interrupt for GIC SPI source */
+ reg = PCIE_IRQ_ALL_MASK & (~PCIE_IRQ_ENABLE_INTS_MASK);
+ advk_writel(pcie, reg, HOST_CTRL_INT_MASK_REG);
+@@ -863,22 +868,11 @@ advk_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
+ *value = PCI_EXP_SLTSTA_PDS << 16;
+ return PCI_BRIDGE_EMUL_HANDLED;
+
+- case PCI_EXP_RTCTL: {
+- u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG);
+- *value = (val & PCIE_MSG_PM_PME_MASK) ? 0 : PCI_EXP_RTCTL_PMEIE;
+- *value |= le16_to_cpu(bridge->pcie_conf.rootctl) & PCI_EXP_RTCTL_CRSSVE;
+- *value |= PCI_EXP_RTCAP_CRSVIS << 16;
+- return PCI_BRIDGE_EMUL_HANDLED;
+- }
+-
+- case PCI_EXP_RTSTA: {
+- u32 isr0 = advk_readl(pcie, PCIE_ISR0_REG);
+- u32 msglog = advk_readl(pcie, PCIE_MSG_LOG_REG);
+- *value = msglog >> 16;
+- if (isr0 & PCIE_MSG_PM_PME_MASK)
+- *value |= PCI_EXP_RTSTA_PME;
+- return PCI_BRIDGE_EMUL_HANDLED;
+- }
++ /*
++ * PCI_EXP_RTCTL and PCI_EXP_RTSTA are also supported, but do not need
++ * to be handled here, because their values are stored in emulated
++ * config space buffer, and we read them from there when needed.
++ */
+
+ case PCI_EXP_LNKCAP: {
+ u32 val = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + reg);
+@@ -933,22 +927,19 @@ advk_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge,
+ advk_pcie_wait_for_retrain(pcie);
+ break;
+
+- case PCI_EXP_RTCTL:
+- /* Only mask/unmask PME interrupt */
+- if (mask & PCI_EXP_RTCTL_PMEIE) {
+- u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG);
+- if (new & PCI_EXP_RTCTL_PMEIE)
+- val &= ~PCIE_MSG_PM_PME_MASK;
+- else
+- val |= PCIE_MSG_PM_PME_MASK;
+- advk_writel(pcie, val, PCIE_ISR0_MASK_REG);
+- }
++ case PCI_EXP_RTCTL: {
++ u16 rootctl = le16_to_cpu(bridge->pcie_conf.rootctl);
++ /* Only emulation of PMEIE and CRSSVE bits is provided */
++ rootctl &= PCI_EXP_RTCTL_PMEIE | PCI_EXP_RTCTL_CRSSVE;
++ bridge->pcie_conf.rootctl = cpu_to_le16(rootctl);
+ break;
++ }
+
+- case PCI_EXP_RTSTA:
+- if (new & PCI_EXP_RTSTA_PME)
+- advk_writel(pcie, PCIE_MSG_PM_PME_MASK, PCIE_ISR0_REG);
+- break;
++ /*
++ * PCI_EXP_RTSTA is also supported, but does not need to be handled
++ * here, because its value is stored in emulated config space buffer,
++ * and we write it there when needed.
++ */
+
+ case PCI_EXP_DEVCTL:
+ case PCI_EXP_DEVCTL2:
+@@ -1450,6 +1441,34 @@ static void advk_pcie_remove_irq_domain(struct advk_pcie *pcie)
+ irq_domain_remove(pcie->irq_domain);
+ }
+
++static void advk_pcie_handle_pme(struct advk_pcie *pcie)
++{
++ u32 requester = advk_readl(pcie, PCIE_MSG_LOG_REG) >> 16;
++ int virq;
++
++ advk_writel(pcie, PCIE_MSG_PM_PME_MASK, PCIE_ISR0_REG);
++
++ /*
++ * PCIE_MSG_LOG_REG contains the last inbound message, so store
++ * the requester ID only when PME was not asserted yet.
++ * Also do not trigger PME interrupt when PME is still asserted.
++ */
++ if (!(le32_to_cpu(pcie->bridge.pcie_conf.rootsta) & PCI_EXP_RTSTA_PME)) {
++ pcie->bridge.pcie_conf.rootsta = cpu_to_le32(requester | PCI_EXP_RTSTA_PME);
++
++ /*
++ * Trigger PME interrupt only if PMEIE bit in Root Control is set.
++ * Aardvark HW returns zero for PCI_EXP_FLAGS_IRQ, so use PCIe interrupt 0.
++ */
++ if (!(le16_to_cpu(pcie->bridge.pcie_conf.rootctl) & PCI_EXP_RTCTL_PMEIE))
++ return;
++
++ virq = irq_find_mapping(pcie->irq_domain, 0);
++ if (generic_handle_irq(virq) == -EINVAL)
++ dev_err_ratelimited(&pcie->pdev->dev, "unhandled PME IRQ\n");
++ }
++}
++
+ static void advk_pcie_handle_msi(struct advk_pcie *pcie)
+ {
+ u32 msi_val, msi_mask, msi_status, msi_idx;
+@@ -1489,18 +1508,9 @@ static void advk_pcie_handle_int(struct advk_pcie *pcie)
+ isr1_mask = advk_readl(pcie, PCIE_ISR1_MASK_REG);
+ isr1_status = isr1_val & ((~isr1_mask) & PCIE_ISR1_ALL_MASK);
+
+- /* Process PME interrupt */
+- if (isr0_status & PCIE_MSG_PM_PME_MASK) {
+- /*
+- * Do not clear PME interrupt bit in ISR0, it is cleared by IRQ
+- * receiver by writing to the PCI_EXP_RTSTA register of emulated
+- * root bridge. Aardvark HW returns zero for PCI_EXP_FLAGS_IRQ,
+- * so use PCIe interrupt 0.
+- */
+- virq = irq_find_mapping(pcie->irq_domain, 0);
+- if (generic_handle_irq(virq) == -EINVAL)
+- dev_err_ratelimited(&pcie->pdev->dev, "unhandled PME IRQ\n");
+- }
++ /* Process PME interrupt as the first one to do not miss PME requester id */
++ if (isr0_status & PCIE_MSG_PM_PME_MASK)
++ advk_pcie_handle_pme(pcie);
+
+ /* Process ERR interrupt */
+ if (isr0_status & PCIE_ISR0_ERR_MASK) {
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0018-PCI-aardvark-Use-separate-INTA-interrupt-for-emulate.patch b/target/linux/generic/pending-5.10/850-0018-PCI-aardvark-Use-separate-INTA-interrupt-for-emulate.patch
new file mode 100644
index 00000000000..46fb548d928
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0018-PCI-aardvark-Use-separate-INTA-interrupt-for-emulate.patch
@@ -0,0 +1,166 @@
+From db305233136f5aa2444a8287a279384e8458c458 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Thu, 1 Apr 2021 20:12:48 +0200
+Subject: [PATCH] PCI: aardvark: Use separate INTA interrupt for emulated root
+ bridge
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Emulated root bridge currently provides only one Legacy INTA interrupt
+which is used for reporting PCIe PME and ERR events and handled by kernel
+PCIe PME and AER drivers.
+
+Aardvark HW reports these PME and ERR events separately, so there is no
+need to mix real INTA interrupt and emulated INTA interrupt for PCIe PME
+and AER drivers.
+
+Register a new advk-RP (as in Root Port) irq chip and a new irq domain
+for emulated root bridge and use this new separate irq domain for
+providing INTA interrupt from emulated root bridge for PME and ERR events.
+
+The real INTA interrupt from real devices is now separate.
+
+A custom map_irq callback function on PCI host bridge structure is used to
+allocate IRQ mapping for emulated root bridge from new irq domain. Original
+callback of_irq_parse_and_map_pci() is used for all other devices as before.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 69 ++++++++++++++++++++++++++-
+ 1 file changed, 67 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index 85a632537b70..b6e723c5725c 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -280,6 +280,7 @@ struct advk_pcie {
+ } wins[OB_WIN_COUNT];
+ u8 wins_count;
+ int irq;
++ struct irq_domain *rp_irq_domain;
+ struct irq_domain *irq_domain;
+ struct irq_chip irq_chip;
+ raw_spinlock_t irq_lock;
+@@ -1441,6 +1442,44 @@ static void advk_pcie_remove_irq_domain(struct advk_pcie *pcie)
+ irq_domain_remove(pcie->irq_domain);
+ }
+
++static struct irq_chip advk_rp_irq_chip = {
++ .name = "advk-RP",
++};
++
++static int advk_pcie_rp_irq_map(struct irq_domain *h,
++ unsigned int virq, irq_hw_number_t hwirq)
++{
++ struct advk_pcie *pcie = h->host_data;
++
++ irq_set_chip_and_handler(virq, &advk_rp_irq_chip, handle_simple_irq);
++ irq_set_chip_data(virq, pcie);
++
++ return 0;
++}
++
++static const struct irq_domain_ops advk_pcie_rp_irq_domain_ops = {
++ .map = advk_pcie_rp_irq_map,
++ .xlate = irq_domain_xlate_onecell,
++};
++
++static int advk_pcie_init_rp_irq_domain(struct advk_pcie *pcie)
++{
++ pcie->rp_irq_domain = irq_domain_add_linear(NULL, 1,
++ &advk_pcie_rp_irq_domain_ops,
++ pcie);
++ if (!pcie->rp_irq_domain) {
++ dev_err(&pcie->pdev->dev, "Failed to add Root Port IRQ domain\n");
++ return -ENOMEM;
++ }
++
++ return 0;
++}
++
++static void advk_pcie_remove_rp_irq_domain(struct advk_pcie *pcie)
++{
++ irq_domain_remove(pcie->rp_irq_domain);
++}
++
+ static void advk_pcie_handle_pme(struct advk_pcie *pcie)
+ {
+ u32 requester = advk_readl(pcie, PCIE_MSG_LOG_REG) >> 16;
+@@ -1463,7 +1502,7 @@ static void advk_pcie_handle_pme(struct advk_pcie *pcie)
+ if (!(le16_to_cpu(pcie->bridge.pcie_conf.rootctl) & PCI_EXP_RTCTL_PMEIE))
+ return;
+
+- virq = irq_find_mapping(pcie->irq_domain, 0);
++ virq = irq_find_mapping(pcie->rp_irq_domain, 0);
+ if (generic_handle_irq(virq) == -EINVAL)
+ dev_err_ratelimited(&pcie->pdev->dev, "unhandled PME IRQ\n");
+ }
+@@ -1520,7 +1559,7 @@ static void advk_pcie_handle_int(struct advk_pcie *pcie)
+ * Aardvark HW returns zero for PCI_ERR_ROOT_AER_IRQ, so use
+ * PCIe interrupt 0
+ */
+- virq = irq_find_mapping(pcie->irq_domain, 0);
++ virq = irq_find_mapping(pcie->rp_irq_domain, 0);
+ if (generic_handle_irq(virq) == -EINVAL)
+ dev_err_ratelimited(&pcie->pdev->dev, "unhandled ERR IRQ\n");
+ }
+@@ -1566,6 +1605,21 @@ static void advk_pcie_irq_handler(struct irq_desc *desc)
+ chained_irq_exit(chip, desc);
+ }
+
++static int advk_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
++{
++ struct advk_pcie *pcie = dev->bus->sysdata;
++
++ /*
++ * Emulated root bridge has its own emulated irq chip and irq domain.
++ * Argument pin is the INTx pin (1=INTA, 2=INTB, 3=INTC, 4=INTD) and
++ * hwirq for irq_create_mapping() is indexed from zero.
++ */
++ if (pci_is_root_bus(dev->bus))
++ return irq_create_mapping(pcie->rp_irq_domain, pin - 1);
++ else
++ return of_irq_parse_and_map_pci(dev, slot, pin);
++}
++
+ static void __maybe_unused advk_pcie_disable_phy(struct advk_pcie *pcie)
+ {
+ phy_power_off(pcie->phy);
+@@ -1769,14 +1823,24 @@ static int advk_pcie_probe(struct platform_device *pdev)
+ return ret;
+ }
+
++ ret = advk_pcie_init_rp_irq_domain(pcie);
++ if (ret) {
++ dev_err(dev, "Failed to initialize irq\n");
++ advk_pcie_remove_msi_irq_domain(pcie);
++ advk_pcie_remove_irq_domain(pcie);
++ return ret;
++ }
++
+ irq_set_chained_handler_and_data(pcie->irq, advk_pcie_irq_handler, pcie);
+
+ bridge->sysdata = pcie;
+ bridge->ops = &advk_pcie_ops;
++ bridge->map_irq = advk_pcie_map_irq;
+
+ ret = pci_host_probe(bridge);
+ if (ret < 0) {
+ irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
++ advk_pcie_remove_rp_irq_domain(pcie);
+ advk_pcie_remove_msi_irq_domain(pcie);
+ advk_pcie_remove_irq_domain(pcie);
+ return ret;
+@@ -1828,6 +1892,7 @@ static int advk_pcie_remove(struct platform_device *pdev)
+ irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
+
+ /* Remove IRQ domains */
++ advk_pcie_remove_rp_irq_domain(pcie);
+ advk_pcie_remove_msi_irq_domain(pcie);
+ advk_pcie_remove_irq_domain(pcie);
+
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0019-PCI-aardvark-Remove-irq_mask_ack-callback-for-INTx-i.patch b/target/linux/generic/pending-5.10/850-0019-PCI-aardvark-Remove-irq_mask_ack-callback-for-INTx-i.patch
new file mode 100644
index 00000000000..d9a6de0dc90
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0019-PCI-aardvark-Remove-irq_mask_ack-callback-for-INTx-i.patch
@@ -0,0 +1,34 @@
+From 8c9eef96e24f34ff8b62b230700416b822691a37 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Thu, 1 Apr 2021 14:24:12 +0200
+Subject: [PATCH] PCI: aardvark: Remove irq_mask_ack callback for INTx
+ interrupts
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Callback for irq_mask_ack is the same as for irq_mask. As there is no
+special handling for irq_ack, there is no need to define irq_mask_ack too.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Acked-by: Marc Zyngier <maz@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index b6e723c5725c..99469e3dc945 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -1420,7 +1420,6 @@ static int advk_pcie_init_irq_domain(struct advk_pcie *pcie)
+ }
+
+ irq_chip->irq_mask = advk_pcie_irq_mask;
+- irq_chip->irq_mask_ack = advk_pcie_irq_mask;
+ irq_chip->irq_unmask = advk_pcie_irq_unmask;
+
+ pcie->irq_domain =
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0020-PCI-aardvark-Don-t-mask-irq-when-mapping.patch b/target/linux/generic/pending-5.10/850-0020-PCI-aardvark-Don-t-mask-irq-when-mapping.patch
new file mode 100644
index 00000000000..e407fc26f9d
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0020-PCI-aardvark-Don-t-mask-irq-when-mapping.patch
@@ -0,0 +1,32 @@
+From dc01fca5a9d9c09ce9a3fb2bc2e7715c37ff3bd9 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Thu, 1 Apr 2021 14:30:06 +0200
+Subject: [PATCH] PCI: aardvark: Don't mask irq when mapping
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+By default, all Legacy INTx interrupts are masked, so there is no need to
+mask this interrupt during irq_map callback.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index 99469e3dc945..e090276ef902 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -1337,7 +1337,6 @@ static int advk_pcie_irq_map(struct irq_domain *h,
+ {
+ struct advk_pcie *pcie = h->host_data;
+
+- advk_pcie_irq_mask(irq_get_irq_data(virq));
+ irq_set_status_flags(virq, IRQ_LEVEL);
+ irq_set_chip_and_handler(virq, &pcie->irq_chip,
+ handle_level_irq);
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0021-PCI-aardvark-Drop-__maybe_unused-from-advk_pcie_disa.patch b/target/linux/generic/pending-5.10/850-0021-PCI-aardvark-Drop-__maybe_unused-from-advk_pcie_disa.patch
new file mode 100644
index 00000000000..62e748d1497
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0021-PCI-aardvark-Drop-__maybe_unused-from-advk_pcie_disa.patch
@@ -0,0 +1,33 @@
+From a511c99262ce19ee06908d27212b39ec4c5aeb17 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>
+Date: Wed, 8 Dec 2021 04:40:29 +0100
+Subject: [PATCH] PCI: aardvark: Drop __maybe_unused from
+ advk_pcie_disable_phy()
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This function is now always used in driver remove method, drop the
+__maybe_unused attribute.
+
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index e090276ef902..aa5629b8b5c9 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -1618,7 +1618,7 @@ static int advk_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+ return of_irq_parse_and_map_pci(dev, slot, pin);
+ }
+
+-static void __maybe_unused advk_pcie_disable_phy(struct advk_pcie *pcie)
++static void advk_pcie_disable_phy(struct advk_pcie *pcie)
+ {
+ phy_power_off(pcie->phy);
+ phy_exit(pcie->phy);
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0022-PCI-aardvark-Update-comment-about-link-going-down-af.patch b/target/linux/generic/pending-5.10/850-0022-PCI-aardvark-Update-comment-about-link-going-down-af.patch
new file mode 100644
index 00000000000..5a2f065125d
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0022-PCI-aardvark-Update-comment-about-link-going-down-af.patch
@@ -0,0 +1,40 @@
+From bafda858364003a70b9cda84282f9761587f8033 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>
+Date: Mon, 10 Jan 2022 00:47:38 +0100
+Subject: [PATCH] PCI: aardvark: Update comment about link going down after
+ link-up
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Update the comment about what happens when link goes down after we have
+checked for link-up. If a PIO request is done while link-down, we have
+a serious problem.
+
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 8 ++++++--
+ 1 file changed, 6 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index aa5629b8b5c9..3c0b6b931061 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -1003,8 +1003,12 @@ static bool advk_pcie_valid_device(struct advk_pcie *pcie, struct pci_bus *bus,
+ return false;
+
+ /*
+- * If the link goes down after we check for link-up, nothing bad
+- * happens but the config access times out.
++ * If the link goes down after we check for link-up, we have a problem:
++ * if a PIO request is executed while link-down, the whole controller
++ * gets stuck in a non-functional state, and even after link comes up
++ * again, PIO requests won't work anymore, and a reset of the whole PCIe
++ * controller is needed. Therefore we need to prevent sending PIO
++ * requests while the link is down.
+ */
+ if (!pci_is_root_bus(bus) && !advk_pcie_link_up(pcie))
+ return false;
+--
+2.34.1
+
diff --git a/target/linux/generic/pending-5.10/850-0023-PCI-aardvark-Make-main-irq_chip-structure-a-static-d.patch b/target/linux/generic/pending-5.10/850-0023-PCI-aardvark-Make-main-irq_chip-structure-a-static-d.patch
new file mode 100644
index 00000000000..2951529df73
--- /dev/null
+++ b/target/linux/generic/pending-5.10/850-0023-PCI-aardvark-Make-main-irq_chip-structure-a-static-d.patch
@@ -0,0 +1,107 @@
+From 663b9f99bb35dbc0c7b685f71ee3668a60d31320 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>
+Date: Mon, 10 Jan 2022 02:02:00 +0100
+Subject: [PATCH] PCI: aardvark: Make main irq_chip structure a static driver
+ structure
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Marc Zyngier says [1] that we should use struct irq_chip as a global
+static struct in the driver. Even though the structure currently
+contains a dynamic member (parent_device), Marc says [2] that he plans
+to kill it and make the structure completely static.
+
+We have already converted others irq_chip structures in this driver in
+this way, but we omitted this one because the .name member is
+dynamically created from device's name, and the name is displayed in
+sysfs, so changing it would break sysfs ABI.
+
+The rationale for changing the name (to "advk-INT") in spite of sysfs
+ABI, and thus allowing to convert to a static structure, is that after
+the other changes we made in this series, the IRQ chip is basically
+something different: it no logner generates ERR and PME interrupts (they
+are generated by emulated bridge's rp_irq_chip).
+
+[1] https://lore.kernel.org/linux-pci/877dbcvngf.wl-maz@kernel.org/
+[2] https://lore.kernel.org/linux-pci/874k6gvkhz.wl-maz@kernel.org/
+
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/pci/controller/pci-aardvark.c | 25 +++++++------------------
+ 1 file changed, 7 insertions(+), 18 deletions(-)
+
+diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
+index 3c0b6b931061..319dd830e36e 100644
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -282,7 +282,6 @@ struct advk_pcie {
+ int irq;
+ struct irq_domain *rp_irq_domain;
+ struct irq_domain *irq_domain;
+- struct irq_chip irq_chip;
+ raw_spinlock_t irq_lock;
+ struct irq_domain *msi_domain;
+ struct irq_domain *msi_inner_domain;
+@@ -1336,14 +1335,19 @@ static void advk_pcie_irq_unmask(struct irq_data *d)
+ raw_spin_unlock_irqrestore(&pcie->irq_lock, flags);
+ }
+
++static struct irq_chip advk_irq_chip = {
++ .name = "advk-INT",
++ .irq_mask = advk_pcie_irq_mask,
++ .irq_unmask = advk_pcie_irq_unmask,
++};
++
+ static int advk_pcie_irq_map(struct irq_domain *h,
+ unsigned int virq, irq_hw_number_t hwirq)
+ {
+ struct advk_pcie *pcie = h->host_data;
+
+ irq_set_status_flags(virq, IRQ_LEVEL);
+- irq_set_chip_and_handler(virq, &pcie->irq_chip,
+- handle_level_irq);
++ irq_set_chip_and_handler(virq, &advk_irq_chip, handle_level_irq);
+ irq_set_chip_data(virq, pcie);
+
+ return 0;
+@@ -1402,7 +1406,6 @@ static int advk_pcie_init_irq_domain(struct advk_pcie *pcie)
+ struct device *dev = &pcie->pdev->dev;
+ struct device_node *node = dev->of_node;
+ struct device_node *pcie_intc_node;
+- struct irq_chip *irq_chip;
+ int ret = 0;
+
+ raw_spin_lock_init(&pcie->irq_lock);
+@@ -1413,28 +1416,14 @@ static int advk_pcie_init_irq_domain(struct advk_pcie *pcie)
+ return -ENODEV;
+ }
+
+- irq_chip = &pcie->irq_chip;
+-
+- irq_chip->name = devm_kasprintf(dev, GFP_KERNEL, "%s-irq",
+- dev_name(dev));
+- if (!irq_chip->name) {
+- ret = -ENOMEM;
+- goto out_put_node;
+- }
+-
+- irq_chip->irq_mask = advk_pcie_irq_mask;
+- irq_chip->irq_unmask = advk_pcie_irq_unmask;
+-
+ pcie->irq_domain =
+ irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
+ &advk_pcie_irq_domain_ops, pcie);
+ if (!pcie->irq_domain) {
+ dev_err(dev, "Failed to get a INTx IRQ domain\n");
+ ret = -ENOMEM;
+- goto out_put_node;
+ }
+
+-out_put_node:
+ of_node_put(pcie_intc_node);
+ return ret;
+ }
+--
+2.34.1
+
--
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