RE: [PATCHv5 09/20] PCI: mobiveil: Correct inbound/outbound window setup routines

From: Z.q. Hou
Date: Mon Jul 01 2019 - 06:25:00 EST

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Hi Lorenzo,

Thanks a lot for your comments!

> -----Original Message-----
> From: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
> Sent: 2019年6月29日 0:42
> To: Z.q. Hou <zhiqiang.hou@xxxxxxx>
> Cc: linux-pci@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> bhelgaas@xxxxxxxxxx; robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx;
> l.subrahmanya@xxxxxxxxxxxxxx; shawnguo@xxxxxxxxxx; Leo Li
> <leoyang.li@xxxxxxx>; catalin.marinas@xxxxxxx; will.deacon@xxxxxxx;
> Mingkai Hu <mingkai.hu@xxxxxxx>; M.h. Lian <minghuan.lian@xxxxxxx>;
> Xiaowei Bao <xiaowei.bao@xxxxxxx>
> Subject: Re: [PATCHv5 09/20] PCI: mobiveil: Correct inbound/outbound
> window setup routines
>
> On Fri, Apr 12, 2019 at 08:36:06AM +0000, Z.q. Hou wrote:
> > From: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> >
> > Outbound window routine:
> > - Remove unused var definitions and register read operations.
> > - Add the upper 32-bit cpu address setup of the window.
> > - Instead of blindly write, only change the fields specified.
> > - Mask the lower bits of window size in case override the
> > control bits.
> > - Check if the passing window number is available, instead of
> > the total number of the initialized windows.
> >
> > Inbound window routine:
> > - Add parameter 'u64 cpu_addr' to specify the cpu address
> > of the window instead of using 'pci_addr'.
> > - Change 'int pci_addr' to 'u64 pci_addr', and add setup
> > of the upper 32-bit PCI address of the window.
> > - Move the PCIe PIO master enablement to mobiveil_host_init().
> > - Instead of blindly write, only change the fields specified.
> > - Mask the lower bits of window size in case override the
> > control bits.
> > - Check if the passing window number is available, instead of
> > the total number of the initialized windows.
> > - And add the statistic of initialized inbound windows.
> >
> > Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host Bridge IP
> > driver")
> > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> > Reviewed-by: Minghuan Lian <Minghuan.Lian@xxxxxxx>
> > Reviewed-by: Subrahmanya Lingappa <l.subrahmanya@xxxxxxxxxxxxxx>
> > ---
> > V5:
> > - Corrected and retouched the subject and changelog.
> >
> > drivers/pci/controller/pcie-mobiveil.c | 70
> > +++++++++++++++-----------
> > 1 file changed, 42 insertions(+), 28 deletions(-)
>
> There are two things to be done here:
>
> 1) Separate fixes from refactoring
> 2) Each fix should be standalone and solve one problem only
>
> The commit log is a list of changes, some of which I can't parse.
>
> You should split this patch as described above and repost it separately but
> first I will try to merge what I can from this series, do not repost as yet.
>

Yes, will split it.

Thanks,
Zhiqiang

> Thanks,
> Lorenzo
>
> > diff --git a/drivers/pci/controller/pcie-mobiveil.c
> > b/drivers/pci/controller/pcie-mobiveil.c
> > index e88afc792a5c..4ba458474e42 100644
> > --- a/drivers/pci/controller/pcie-mobiveil.c
> > +++ b/drivers/pci/controller/pcie-mobiveil.c
> > @@ -65,9 +65,13 @@
> > #define PAB_AXI_AMAP_CTRL(win) PAB_REG_ADDR(0x0ba0,
> win)
> > #define WIN_ENABLE_SHIFT 0
> > #define WIN_TYPE_SHIFT 1
> > +#define WIN_TYPE_MASK 0x3
> > +#define WIN_SIZE_SHIFT 10
> > +#define WIN_SIZE_MASK 0x3fffff
> >
> > #define PAB_EXT_AXI_AMAP_SIZE(win) PAB_EXT_REG_ADDR(0xbaf0,
> win)
> >
> > +#define PAB_EXT_AXI_AMAP_AXI_WIN(win)
> PAB_EXT_REG_ADDR(0x80a0, win)
> > #define PAB_AXI_AMAP_AXI_WIN(win) PAB_REG_ADDR(0x0ba4, win)
> > #define AXI_WINDOW_ALIGN_MASK 3
> >
> > @@ -82,8 +86,10 @@
> > #define PAB_PEX_AMAP_CTRL(win) PAB_REG_ADDR(0x4ba0,
> win)
> > #define AMAP_CTRL_EN_SHIFT 0
> > #define AMAP_CTRL_TYPE_SHIFT 1
> > +#define AMAP_CTRL_TYPE_MASK 3
> >
> > #define PAB_EXT_PEX_AMAP_SIZEN(win) PAB_EXT_REG_ADDR(0xbef0,
> win)
> > +#define PAB_EXT_PEX_AMAP_AXI_WIN(win)
> PAB_EXT_REG_ADDR(0xb4a0, win)
> > #define PAB_PEX_AMAP_AXI_WIN(win) PAB_REG_ADDR(0x4ba4,
> win)
> > #define PAB_PEX_AMAP_PEX_WIN_L(win) PAB_REG_ADDR(0x4ba8,
> win)
> > #define PAB_PEX_AMAP_PEX_WIN_H(win) PAB_REG_ADDR(0x4bac,
> win)
> > @@ -455,49 +461,51 @@ static int mobiveil_pcie_parse_dt(struct
> > mobiveil_pcie *pcie) }
> >
> > static void program_ib_windows(struct mobiveil_pcie *pcie, int
> win_num,
> > - int pci_addr, u32 type, u64 size)
> > + u64 cpu_addr, u64 pci_addr, u32 type, u64 size)
> > {
> > - int pio_ctrl_val;
> > - int amap_ctrl_dw;
> > + u32 value;
> > u64 size64 = ~(size - 1);
> >
> > - if ((pcie->ib_wins_configured + 1) > pcie->ppio_wins) {
> > + if (win_num >= pcie->ppio_wins) {
> > dev_err(&pcie->pdev->dev,
> > "ERROR: max inbound windows reached !\n");
> > return;
> > }
> >
> > - pio_ctrl_val = csr_readl(pcie, PAB_PEX_PIO_CTRL);
> > - pio_ctrl_val |= 1 << PIO_ENABLE_SHIFT;
> > - csr_writel(pcie, pio_ctrl_val, PAB_PEX_PIO_CTRL);
> > -
> > - amap_ctrl_dw = csr_readl(pcie, PAB_PEX_AMAP_CTRL(win_num));
> > - amap_ctrl_dw |= (type << AMAP_CTRL_TYPE_SHIFT) |
> > - (1 << AMAP_CTRL_EN_SHIFT) |
> > - lower_32_bits(size64);
> > - csr_writel(pcie, amap_ctrl_dw, PAB_PEX_AMAP_CTRL(win_num));
> > + value = csr_readl(pcie, PAB_PEX_AMAP_CTRL(win_num));
> > + value &= ~(AMAP_CTRL_TYPE_MASK << AMAP_CTRL_TYPE_SHIFT |
> > + WIN_SIZE_MASK << WIN_SIZE_SHIFT);
> > + value |= (type << AMAP_CTRL_TYPE_SHIFT) | (1 <<
> AMAP_CTRL_EN_SHIFT) |
> > + (lower_32_bits(size64) & WIN_SIZE_MASK << WIN_SIZE_SHIFT);
> > + csr_writel(pcie, value, PAB_PEX_AMAP_CTRL(win_num));
> >
> > csr_writel(pcie, upper_32_bits(size64),
> > PAB_EXT_PEX_AMAP_SIZEN(win_num));
> >
> > - csr_writel(pcie, pci_addr, PAB_PEX_AMAP_AXI_WIN(win_num));
> > + csr_writel(pcie, lower_32_bits(cpu_addr),
> > + PAB_PEX_AMAP_AXI_WIN(win_num));
> > + csr_writel(pcie, upper_32_bits(cpu_addr),
> > + PAB_EXT_PEX_AMAP_AXI_WIN(win_num));
> > +
> > + csr_writel(pcie, lower_32_bits(pci_addr),
> > + PAB_PEX_AMAP_PEX_WIN_L(win_num));
> > + csr_writel(pcie, upper_32_bits(pci_addr),
> > + PAB_PEX_AMAP_PEX_WIN_H(win_num));
> >
> > - csr_writel(pcie, pci_addr, PAB_PEX_AMAP_PEX_WIN_L(win_num));
> > - csr_writel(pcie, 0, PAB_PEX_AMAP_PEX_WIN_H(win_num));
> > + pcie->ib_wins_configured++;
> > }
> >
> > /*
> > * routine to program the outbound windows
> > */
> > static void program_ob_windows(struct mobiveil_pcie *pcie, int
> win_num,
> > - u64 cpu_addr, u64 pci_addr,
> > - u32 config_io_bit, u64 size)
> > + u64 cpu_addr, u64 pci_addr, u32 type, u64 size)
> > {
> >
> > - u32 value, type;
> > + u32 value;
> > u64 size64 = ~(size - 1);
> >
> > - if ((pcie->ob_wins_configured + 1) > pcie->apio_wins) {
> > + if (win_num >= pcie->apio_wins) {
> > dev_err(&pcie->pdev->dev,
> > "ERROR: max outbound windows reached !\n");
> > return;
> > @@ -507,10 +515,12 @@ static void program_ob_windows(struct
> mobiveil_pcie *pcie, int win_num,
> > * program Enable Bit to 1, Type Bit to (00) base 2, AXI Window Size Bit
> > * to 4 KB in PAB_AXI_AMAP_CTRL register
> > */
> > - type = config_io_bit;
> > value = csr_readl(pcie, PAB_AXI_AMAP_CTRL(win_num));
> > - csr_writel(pcie, 1 << WIN_ENABLE_SHIFT | type << WIN_TYPE_SHIFT |
> > - lower_32_bits(size64), PAB_AXI_AMAP_CTRL(win_num));
> > + value &= ~(WIN_TYPE_MASK << WIN_TYPE_SHIFT |
> > + WIN_SIZE_MASK << WIN_SIZE_SHIFT);
> > + value |= 1 << WIN_ENABLE_SHIFT | type << WIN_TYPE_SHIFT |
> > + (lower_32_bits(size64) & WIN_SIZE_MASK << WIN_SIZE_SHIFT);
> > + csr_writel(pcie, value, PAB_AXI_AMAP_CTRL(win_num));
> >
> > csr_writel(pcie, upper_32_bits(size64),
> > PAB_EXT_AXI_AMAP_SIZE(win_num));
> >
> > @@ -518,11 +528,10 @@ static void program_ob_windows(struct
> mobiveil_pcie *pcie, int win_num,
> > * program AXI window base with appropriate value in
> > * PAB_AXI_AMAP_AXI_WIN0 register
> > */
> > - value = csr_readl(pcie, PAB_AXI_AMAP_AXI_WIN(win_num));
> > - csr_writel(pcie, cpu_addr & (~AXI_WINDOW_ALIGN_MASK),
> > + csr_writel(pcie, lower_32_bits(cpu_addr) &
> (~AXI_WINDOW_ALIGN_MASK),
> > PAB_AXI_AMAP_AXI_WIN(win_num));
> > -
> > - value = csr_readl(pcie, PAB_AXI_AMAP_PEX_WIN_H(win_num));
> > + csr_writel(pcie, upper_32_bits(cpu_addr),
> > + PAB_EXT_AXI_AMAP_AXI_WIN(win_num));
> >
> > csr_writel(pcie, lower_32_bits(pci_addr),
> > PAB_AXI_AMAP_PEX_WIN_L(win_num)); @@ -604,6 +613,11
> @@ static
> > int mobiveil_host_init(struct mobiveil_pcie *pcie)
> > value |= APIO_EN_MASK;
> > csr_writel(pcie, value, PAB_AXI_PIO_CTRL);
> >
> > + /* Enable PCIe PIO master */
> > + value = csr_readl(pcie, PAB_PEX_PIO_CTRL);
> > + value |= 1 << PIO_ENABLE_SHIFT;
> > + csr_writel(pcie, value, PAB_PEX_PIO_CTRL);
> > +
> > /*
> > * we'll program one outbound window for config reads and
> > * another default inbound window for all the upstream traffic @@
> > -616,7 +630,7 @@ static int mobiveil_host_init(struct mobiveil_pcie *pcie)
> > CFG_WINDOW_TYPE, resource_size(pcie->ob_io_res));
> >
> > /* memory inbound translation window */
> > - program_ib_windows(pcie, WIN_NUM_0, 0, MEM_WINDOW_TYPE,
> IB_WIN_SIZE);
> > + program_ib_windows(pcie, WIN_NUM_0, 0, 0, MEM_WINDOW_TYPE,
> > +IB_WIN_SIZE);
> >
> > /* Get the I/O and memory ranges from DT */
> > resource_list_for_each_entry(win, &pcie->resources) {
> > --
> > 2.17.1
> >

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Previous message: Sebastian Andrzej Siewior: "Re: [RFC] Deadlock via recursive wakeup via RCU with threadirqs"
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