Re: [PATCH v2 5/5] PCI: dwc: Move dw_pcie_msi_init() from each users to designware host

Vidya Sagar
2020-10-08T05:45:57Z

On 9/24/2020 4:37 PM, Jisheng Zhang wrote:
> External email: Use caution opening links or attachments
>
>
> Currently, dw_pcie_msi_init() allocates and maps page for msi, then
> program the PCIE_MSI_ADDR_LO and PCIE_MSI_ADDR_HI. The Root Complex
> may lose power during suspend-to-RAM, so when we resume, we want to
> redo the latter but not the former. If designware based driver (for
> example, pcie-tegra194.c) calls dw_pcie_msi_init() in resume path, the
> previous msi page will be leaked. From another side, except
> pci-dra7xx.c we can move the dw_pcie_msi_init() from each users to
> designware host, I.E move the msi page allocation and mapping to
> dw_pcie_host_init() and move the PCIE_MSI_ADDR_* programming to
> dw_pcie_setup_rc(). After this moving, we solve the msi page leakage
> as well.
>
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
> ---
> drivers/pci/controller/dwc/pci-dra7xx.c | 1 +
> drivers/pci/controller/dwc/pci-exynos.c | 2 --
> drivers/pci/controller/dwc/pci-imx6.c | 3 ---
> drivers/pci/controller/dwc/pci-meson.c | 8 -------
> drivers/pci/controller/dwc/pcie-artpec6.c | 10 --------
> .../pci/controller/dwc/pcie-designware-host.c | 24 ++++++++++++-------
> .../pci/controller/dwc/pcie-designware-plat.c | 3 ---
> drivers/pci/controller/dwc/pcie-designware.h | 5 ++++
> drivers/pci/controller/dwc/pcie-histb.c | 3 ---
> drivers/pci/controller/dwc/pcie-kirin.c | 3 ---
> drivers/pci/controller/dwc/pcie-qcom.c | 3 ---
> drivers/pci/controller/dwc/pcie-spear13xx.c | 1 -
> drivers/pci/controller/dwc/pcie-tegra194.c | 2 --
> drivers/pci/controller/dwc/pcie-uniphier.c | 9 +------
> 14 files changed, 22 insertions(+), 55 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
> index dc387724cf08..d8b74389e353 100644
> --- a/drivers/pci/controller/dwc/pci-dra7xx.c
> +++ b/drivers/pci/controller/dwc/pci-dra7xx.c
> @@ -210,6 +210,7 @@ static int dra7xx_pcie_host_init(struct pcie_port *pp)
> dra7xx_pcie_establish_link(pci);
> dw_pcie_wait_for_link(pci);
> dw_pcie_msi_init(pp);
> + dw_pcie_msi_config(pp);
> dra7xx_pcie_enable_interrupts(dra7xx);
>
> return 0;
> diff --git a/drivers/pci/controller/dwc/pci-exynos.c b/drivers/pci/controller/dwc/pci-exynos.c
> index 8d82c43ae299..9cca0ce79777 100644
> --- a/drivers/pci/controller/dwc/pci-exynos.c
> +++ b/drivers/pci/controller/dwc/pci-exynos.c
> @@ -298,8 +298,6 @@ static void exynos_pcie_msi_init(struct exynos_pcie *ep)
> struct pcie_port *pp = &pci->pp;
> u32 val;
>
> - dw_pcie_msi_init(pp);
> -
> /* enable MSI interrupt */
> val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_IRQ_EN_LEVEL);
> val |= IRQ_MSI_ENABLE;
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 5fef2613b223..dba6e351e3df 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -848,9 +848,6 @@ static int imx6_pcie_host_init(struct pcie_port *pp)
> dw_pcie_setup_rc(pp);
> imx6_pcie_establish_link(imx6_pcie);
>
> - if (IS_ENABLED(CONFIG_PCI_MSI))
> - dw_pcie_msi_init(pp);
> -
> return 0;
> }
>
> diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
> index 4f183b96afbb..cd0d9dd8dd61 100644
> --- a/drivers/pci/controller/dwc/pci-meson.c
> +++ b/drivers/pci/controller/dwc/pci-meson.c
> @@ -377,12 +377,6 @@ static int meson_pcie_establish_link(struct meson_pcie *mp)
> return dw_pcie_wait_for_link(pci);
> }
>
> -static void meson_pcie_enable_interrupts(struct meson_pcie *mp)
> -{
> - if (IS_ENABLED(CONFIG_PCI_MSI))
> - dw_pcie_msi_init(&mp->pci.pp);
> -}
> -
> static int meson_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
> u32 *val)
> {
> @@ -467,8 +461,6 @@ static int meson_pcie_host_init(struct pcie_port *pp)
> if (ret)
> return ret;
>
> - meson_pcie_enable_interrupts(mp);
> -
> return 0;
> }
>
> diff --git a/drivers/pci/controller/dwc/pcie-artpec6.c b/drivers/pci/controller/dwc/pcie-artpec6.c
> index 97d50bb50f06..af1e6bb28e7a 100644
> --- a/drivers/pci/controller/dwc/pcie-artpec6.c
> +++ b/drivers/pci/controller/dwc/pcie-artpec6.c
> @@ -346,15 +346,6 @@ static void artpec6_pcie_deassert_core_reset(struct artpec6_pcie *artpec6_pcie)
> usleep_range(100, 200);
> }
>
> -static void artpec6_pcie_enable_interrupts(struct artpec6_pcie *artpec6_pcie)
> -{
> - struct dw_pcie *pci = artpec6_pcie->pci;
> - struct pcie_port *pp = &pci->pp;
> -
> - if (IS_ENABLED(CONFIG_PCI_MSI))
> - dw_pcie_msi_init(pp);
> -}
> -
> static int artpec6_pcie_host_init(struct pcie_port *pp)
> {
> struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> @@ -368,7 +359,6 @@ static int artpec6_pcie_host_init(struct pcie_port *pp)
> dw_pcie_setup_rc(pp);
> artpec6_pcie_establish_link(pci);
> dw_pcie_wait_for_link(pci);
> - artpec6_pcie_enable_interrupts(artpec6_pcie);
>
> return 0;
> }
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 7a8adf597803..6603d7c36f2e 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -296,11 +296,23 @@ void dw_pcie_msi_deinit(struct pcie_port *pp)
> }
> }
>
> +void dw_pcie_msi_config(struct pcie_port *pp)
> +{
> + if (pp->msi_page) {
> + u64 msi_target = (u64)pp->msi_data;
> +
> + /* Program the msi_data */
> + dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
> + lower_32_bits(msi_target));
> + dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4,
> + upper_32_bits(msi_target));
> + }
> +}
> +
> void dw_pcie_msi_init(struct pcie_port *pp)
> {
> struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> struct device *dev = pci->dev;
> - u64 msi_target;
>
> pp->msi_page = alloc_page(GFP_KERNEL);
I'm not sure if it can be addressed in the same patch, but I think it is
required to call dma_set_coherent_mask() with 32-bit mask before calling
dma_map_single() as there are endpoint devices which are only 32-bit MSI
capable and it is required to restrict the MSI target address to always
be in 32-bit domain so that both kinds of endpoints (only 32-bit capable
and 64-bit capable) can work with this 32-bit MSI target.

> if (!pp->msi_page) {
> @@ -314,15 +326,7 @@ void dw_pcie_msi_init(struct pcie_port *pp)
> dev_err(dev, "Failed to map MSI data\n");
> __free_page(pp->msi_page);
> pp->msi_page = NULL;
> - return;
> }
> - msi_target = (u64)pp->msi_data;
> -
> - /* Program the msi_data */
> - dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
> - lower_32_bits(msi_target));
> - dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4,
> - upper_32_bits(msi_target));
> }
> EXPORT_SYMBOL_GPL(dw_pcie_msi_init);
>
> @@ -449,6 +453,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
> irq_set_chained_handler_and_data(pp->msi_irq,
> dw_chained_msi_isr,
> pp);
> + dw_pcie_msi_init(pp);
> } else {
> ret = pp->ops->msi_host_init(pp);
> if (ret < 0)
> @@ -654,6 +659,7 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
> (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
> 4, ~0);
> }
> + dw_pcie_msi_config(pp);
> }
>
> /* Setup RC BARs */
> diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c
> index 712456f6ce36..9ccf69a3dcf4 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-plat.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
> @@ -40,9 +40,6 @@ static int dw_plat_pcie_host_init(struct pcie_port *pp)
> dw_pcie_setup_rc(pp);
> dw_pcie_wait_for_link(pci);
>
> - if (IS_ENABLED(CONFIG_PCI_MSI))
> - dw_pcie_msi_init(pp);
> -
> return 0;
> }
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 43b8061e1bec..40d22fe33afe 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -372,6 +372,7 @@ static inline void dw_pcie_dbi_ro_wr_dis(struct dw_pcie *pci)
> irqreturn_t dw_handle_msi_irq(struct pcie_port *pp);
> void dw_pcie_msi_init(struct pcie_port *pp);
> void dw_pcie_msi_deinit(struct pcie_port *pp);
> +void dw_pcie_msi_config(struct pcie_port *pp);
> void dw_pcie_setup_rc(struct pcie_port *pp);
> int dw_pcie_host_init(struct pcie_port *pp);
> void dw_pcie_host_deinit(struct pcie_port *pp);
> @@ -390,6 +391,10 @@ static inline void dw_pcie_msi_deinit(struct pcie_port *pp)
> {
> }
>
> +static inline void dw_pcie_msi_config(struct pcie_port *pp)
> +{
> +}
> +
> static inline void dw_pcie_setup_rc(struct pcie_port *pp)
> {
> }
> diff --git a/drivers/pci/controller/dwc/pcie-histb.c b/drivers/pci/controller/dwc/pcie-histb.c
> index 2a2835746077..fbf53e897ca7 100644
> --- a/drivers/pci/controller/dwc/pcie-histb.c
> +++ b/drivers/pci/controller/dwc/pcie-histb.c
> @@ -196,9 +196,6 @@ static int histb_pcie_host_init(struct pcie_port *pp)
> {
> histb_pcie_establish_link(pp);
>
> - if (IS_ENABLED(CONFIG_PCI_MSI))
> - dw_pcie_msi_init(pp);
> -
> return 0;
> }
>
> diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
> index e496f51e0152..d7246995daf0 100644
> --- a/drivers/pci/controller/dwc/pcie-kirin.c
> +++ b/drivers/pci/controller/dwc/pcie-kirin.c
> @@ -425,9 +425,6 @@ static int kirin_pcie_host_init(struct pcie_port *pp)
> {
> kirin_pcie_establish_link(pp);
>
> - if (IS_ENABLED(CONFIG_PCI_MSI))
> - dw_pcie_msi_init(pp);
> -
> return 0;
> }
>
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index 3aac77a295ba..2abbb850fb56 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1281,9 +1281,6 @@ static int qcom_pcie_host_init(struct pcie_port *pp)
>
> dw_pcie_setup_rc(pp);
>
> - if (IS_ENABLED(CONFIG_PCI_MSI))
> - dw_pcie_msi_init(pp);
> -
> qcom_ep_reset_deassert(pcie);
>
> ret = qcom_pcie_establish_link(pcie);
> diff --git a/drivers/pci/controller/dwc/pcie-spear13xx.c b/drivers/pci/controller/dwc/pcie-spear13xx.c
> index 62846562da0b..760e27de0082 100644
> --- a/drivers/pci/controller/dwc/pcie-spear13xx.c
> +++ b/drivers/pci/controller/dwc/pcie-spear13xx.c
> @@ -157,7 +157,6 @@ static void spear13xx_pcie_enable_interrupts(struct spear13xx_pcie *spear13xx_pc
>
> /* Enable MSI interrupt */
> if (IS_ENABLED(CONFIG_PCI_MSI)) {
> - dw_pcie_msi_init(pp);
> writel(readl(&app_reg->int_mask) |
> MSI_CTRL_INT, &app_reg->int_mask);
> }
> diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
> index 70498689d0c0..b51fe136d345 100644
> --- a/drivers/pci/controller/dwc/pcie-tegra194.c
> +++ b/drivers/pci/controller/dwc/pcie-tegra194.c
> @@ -783,8 +783,6 @@ static void tegra_pcie_enable_msi_interrupts(struct pcie_port *pp)
> struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
> u32 val;
>
> - dw_pcie_msi_init(pp);
> -
> /* Enable MSI interrupt generation */
> val = appl_readl(pcie, APPL_INTR_EN_L0_0);
> val |= APPL_INTR_EN_L0_0_SYS_MSI_INTR_EN;
> diff --git a/drivers/pci/controller/dwc/pcie-uniphier.c b/drivers/pci/controller/dwc/pcie-uniphier.c
> index 3a7f403b57b8..d7b465b669f4 100644
> --- a/drivers/pci/controller/dwc/pcie-uniphier.c
> +++ b/drivers/pci/controller/dwc/pcie-uniphier.c
> @@ -318,14 +318,7 @@ static int uniphier_pcie_host_init(struct pcie_port *pp)
> uniphier_pcie_irq_enable(priv);
>
> dw_pcie_setup_rc(pp);
> - ret = uniphier_pcie_establish_link(pci);
> - if (ret)
> - return ret;
> -
> - if (IS_ENABLED(CONFIG_PCI_MSI))
> - dw_pcie_msi_init(pp);
> -
> - return 0;
> + return uniphier_pcie_establish_link(pci);
> }
>
> static const struct dw_pcie_host_ops uniphier_pcie_host_ops = {
> --
> 2.28.0