On Friday 07 May 2021 11:19:48 Marc Zyngier wrote:
> On Thu, 06 May 2021 16:31:29 +0100,
> Pali Rohár <pali@xxxxxxxxxx> wrote:
> >
> > Define a new macro PCIE_MSI_ALL_MASK and use it for masking, unmasking and
> > clearing all MSI interrupts.
> >
> > Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
> > Reviewed-by: Marek Behún <kabel@xxxxxxxxxx>
> > Cc: stable@xxxxxxxxxxxxxxx
> > ---
> > drivers/pci/controller/pci-aardvark.c | 16 ++++++++++------
> > 1 file changed, 10 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
> > index 498810c00b6d..5e0243b2c473 100644
> > --- a/drivers/pci/controller/pci-aardvark.c
> > +++ b/drivers/pci/controller/pci-aardvark.c
> > @@ -117,6 +117,7 @@
> > #define PCIE_MSI_ADDR_HIGH_REG (CONTROL_BASE_ADDR + 0x54)
> > #define PCIE_MSI_STATUS_REG (CONTROL_BASE_ADDR + 0x58)
> > #define PCIE_MSI_MASK_REG (CONTROL_BASE_ADDR + 0x5C)
> > +#define PCIE_MSI_ALL_MASK GENMASK(31, 0)
> > #define PCIE_MSI_PAYLOAD_REG (CONTROL_BASE_ADDR + 0x9C)
> > #define PCIE_MSI_DATA_MASK GENMASK(15, 0)
> >
> > @@ -386,19 +387,22 @@ static void advk_pcie_setup_hw(struct advk_pcie *pcie)
> > advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);
> >
> > /* Clear all interrupts */
> > + advk_writel(pcie, PCIE_MSI_ALL_MASK, PCIE_MSI_STATUS_REG);
> > advk_writel(pcie, PCIE_ISR0_ALL_MASK, PCIE_ISR0_REG);
> > 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 */
> > - 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, 0, PCIE_MSI_MASK_REG);
> > + advk_writel(pcie, ~(u32)PCIE_MSI_ALL_MASK, PCIE_MSI_MASK_REG);
>
> I really wonder why you'd unmask all MSIs. Yes, the current code does
> that already, but I'd expect MSIs to be individually unmasked as they
> get enabled by the core code.
Individual unmasking is implemented in later patches in this patch series.
> Thanks,
>
> M.
>
> > +
> > + /* 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);
> > @@ -1049,7 +1053,7 @@ static void advk_pcie_handle_msi(struct advk_pcie *pcie)
> >
> > msi_mask = advk_readl(pcie, PCIE_MSI_MASK_REG);
> > msi_val = advk_readl(pcie, PCIE_MSI_STATUS_REG);
> > - msi_status = msi_val & ~msi_mask;
> > + msi_status = msi_val & ((~msi_mask) & PCIE_MSI_ALL_MASK);
> >
> > for (msi_idx = 0; msi_idx < MSI_IRQ_NUM; msi_idx++) {
> > if (!(BIT(msi_idx) & msi_status))
> > --
> > 2.20.1
> >
> >
>
> --
> Without deviation from the norm, progress is not possible.
