Re: [PATCH 32/32] pci: serial: Support reading PCI-register size with base

["Pali Rohár" <pali@kernel.org>]

Simon, could you react here? Because Tom is complaining again that I'm
not responding to this email. But this is again total nonsense from Tom
as I have asked you to react 2 times, which provides that I'm not the
one who does not response here.

On Sunday 03 September 2023 22:39:39 Pali Rohár wrote:
> I still have not received any reply from you.
> 
> On Wednesday 30 August 2023 20:14:59 Pali Rohár wrote:
> > Simon, why you are contacting me? You have wrote to me that you would
> > ignore my reviews here, so what you want now? Could you please explain
> > what you are trying to achieve? I'm not going to review this or any
> > other your changes.
> > 
> > On Wednesday 30 August 2023 12:05:03 Simon Glass wrote:
> > > The PCI helpers read only the base address for a PCI region. In some cases
> > > the size is needed as well, e.g. to pass along to a driver which needs to
> > > know the size of its register area.
> > > 
> > > Update the functions to allow the size to be returned. For serial, record
> > > the information and provided it with the serial_info() call.
> > > 
> > > A limitation still exists in that the size is not available when OF_LIVE
> > > is enabled, so take account of that in the tests.
> > > 
> > > Signed-off-by: Simon Glass <sjg@chromium.org>
> > > ---
> > > 
> > >  arch/sandbox/dts/test.dts   |  6 +++---
> > >  drivers/core/fdtaddr.c      |  6 +++---
> > >  drivers/core/ofnode.c       | 11 ++++++++---
> > >  drivers/core/read.c         |  6 ++++--
> > >  drivers/core/util.c         |  2 +-
> > >  drivers/pci/pci-uclass.c    |  2 +-
> > >  drivers/pci/pci_mvebu.c     |  3 ++-
> > >  drivers/pci/pci_tegra.c     |  2 +-
> > >  drivers/pci/pcie_mediatek.c |  4 ++--
> > >  drivers/serial/ns16550.c    | 15 ++++++++++-----
> > >  include/dm/fdtaddr.h        |  3 ++-
> > >  include/dm/ofnode.h         |  4 +++-
> > >  include/dm/read.h           |  8 +++++---
> > >  include/ns16550.h           |  4 +++-
> > >  include/serial.h            |  2 ++
> > >  test/dm/pci.c               | 14 ++++++++++----
> > >  16 files changed, 60 insertions(+), 32 deletions(-)
> > > 
> > > diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
> > > index a413cbe4989..961e8895a49 100644
> > > --- a/arch/sandbox/dts/test.dts
> > > +++ b/arch/sandbox/dts/test.dts
> > > @@ -1087,8 +1087,8 @@
> > >  		pci@1,0 {
> > >  			compatible = "pci-generic";
> > >  			/* reg 0 is at 0x14, using FDT_PCI_SPACE_MEM32 */
> > > -			reg = <0x02000814 0 0 0 0
> > > -			       0x01000810 0 0 0 0>;
> > > +			reg = <0x02000814 0 0 0x80 0
> > > +			       0x01000810 0 0 0xc0 0>;
> > >  			sandbox,emul = <&swap_case_emul0_1>;
> > >  		};
> > >  		p2sb-pci@2,0 {
> > > @@ -1115,7 +1115,7 @@
> > >  		pci@1f,0 {
> > >  			compatible = "pci-generic";
> > >  			/* reg 0 is at 0x10, using FDT_PCI_SPACE_IO */
> > > -			reg = <0x0100f810 0 0 0 0>;
> > > +			reg = <0x0100f810 0 0 0x100 0>;
> > >  			sandbox,emul = <&swap_case_emul0_1f>;
> > >  		};
> > >  	};
> > > diff --git a/drivers/core/fdtaddr.c b/drivers/core/fdtaddr.c
> > > index 546db675aaf..b79d138c419 100644
> > > --- a/drivers/core/fdtaddr.c
> > > +++ b/drivers/core/fdtaddr.c
> > > @@ -215,7 +215,7 @@ void *devfdt_map_physmem(const struct udevice *dev, unsigned long size)
> > >  	return map_physmem(addr, size, MAP_NOCACHE);
> > >  }
> > >  
> > > -fdt_addr_t devfdt_get_addr_pci(const struct udevice *dev)
> > > +fdt_addr_t devfdt_get_addr_pci(const struct udevice *dev, fdt_size_t *sizep)
> > >  {
> > >  	ulong addr;
> > >  
> > > @@ -226,12 +226,12 @@ fdt_addr_t devfdt_get_addr_pci(const struct udevice *dev)
> > >  		int ret;
> > >  
> > >  		ret = ofnode_read_pci_addr(dev_ofnode(dev), FDT_PCI_SPACE_MEM32,
> > > -					   "reg", &pci_addr);
> > > +					   "reg", &pci_addr, sizep);
> > >  		if (ret) {
> > >  			/* try if there is any i/o-mapped register */
> > >  			ret = ofnode_read_pci_addr(dev_ofnode(dev),
> > >  						   FDT_PCI_SPACE_IO, "reg",
> > > -						   &pci_addr);
> > > +						   &pci_addr, sizep);
> > >  			if (ret)
> > >  				return FDT_ADDR_T_NONE;
> > >  		}
> > > diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
> > > index 2ef4114cb6f..c9cec456f43 100644
> > > --- a/drivers/core/ofnode.c
> > > +++ b/drivers/core/ofnode.c
> > > @@ -1270,7 +1270,8 @@ const uint8_t *ofnode_read_u8_array_ptr(ofnode node, const char *propname,
> > >  }
> > >  
> > >  int ofnode_read_pci_addr(ofnode node, enum fdt_pci_space type,
> > > -			 const char *propname, struct fdt_pci_addr *addr)
> > > +			 const char *propname, struct fdt_pci_addr *addr,
> > > +			 fdt_size_t *size)
> > >  {
> > >  	const fdt32_t *cell;
> > >  	int len;
> > > @@ -1298,14 +1299,18 @@ int ofnode_read_pci_addr(ofnode node, enum fdt_pci_space type,
> > >  			      (ulong)fdt32_to_cpu(cell[1]),
> > >  			      (ulong)fdt32_to_cpu(cell[2]));
> > >  			if ((fdt32_to_cpu(*cell) & type) == type) {
> > > +				const unaligned_fdt64_t *ptr;
> > > +
> > >  				addr->phys_hi = fdt32_to_cpu(cell[0]);
> > >  				addr->phys_mid = fdt32_to_cpu(cell[1]);
> > >  				addr->phys_lo = fdt32_to_cpu(cell[2]);
> > > +				ptr = (const unaligned_fdt64_t *)(cell + 3);
> > > +				if (size)
> > > +					*size = fdt64_to_cpu(*ptr);
> > >  				break;
> > >  			}
> > >  
> > > -			cell += (FDT_PCI_ADDR_CELLS +
> > > -				 FDT_PCI_SIZE_CELLS);
> > > +			cell += FDT_PCI_ADDR_CELLS + FDT_PCI_SIZE_CELLS;
> > >  		}
> > >  
> > >  		if (i == num) {
> > > diff --git a/drivers/core/read.c b/drivers/core/read.c
> > > index 49066b59cda..419013451f0 100644
> > > --- a/drivers/core/read.c
> > > +++ b/drivers/core/read.c
> > > @@ -405,13 +405,15 @@ int dev_read_alias_highest_id(const char *stem)
> > >  	return fdtdec_get_alias_highest_id(gd->fdt_blob, stem);
> > >  }
> > >  
> > > -fdt_addr_t dev_read_addr_pci(const struct udevice *dev)
> > > +fdt_addr_t dev_read_addr_pci(const struct udevice *dev, fdt_size_t *sizep)
> > >  {
> > >  	ulong addr;
> > >  
> > >  	addr = dev_read_addr(dev);
> > > +	if (sizep)
> > > +		*sizep = 0;
> > >  	if (addr == FDT_ADDR_T_NONE && !of_live_active())
> > > -		addr = devfdt_get_addr_pci(dev);
> > > +		addr = devfdt_get_addr_pci(dev, sizep);
> > >  
> > >  	return addr;
> > >  }
> > > diff --git a/drivers/core/util.c b/drivers/core/util.c
> > > index aa60fdd15bc..81497df85ff 100644
> > > --- a/drivers/core/util.c
> > > +++ b/drivers/core/util.c
> > > @@ -30,7 +30,7 @@ int pci_get_devfn(struct udevice *dev)
> > >  
> > >  	/* Extract the devfn from fdt_pci_addr */
> > >  	ret = ofnode_read_pci_addr(dev_ofnode(dev), FDT_PCI_SPACE_CONFIG,
> > > -				   "reg", &addr);
> > > +				   "reg", &addr, NULL);
> > >  	if (ret) {
> > >  		if (ret != -ENOENT)
> > >  			return -EINVAL;
> > > diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
> > > index 0adcdceb1d3..c670f8754e8 100644
> > > --- a/drivers/pci/pci-uclass.c
> > > +++ b/drivers/pci/pci-uclass.c
> > > @@ -122,7 +122,7 @@ static void pci_dev_find_ofnode(struct udevice *bus, phys_addr_t bdf,
> > >  
> > >  	dev_for_each_subnode(node, bus) {
> > >  		ret = ofnode_read_pci_addr(node, FDT_PCI_SPACE_CONFIG, "reg",
> > > -					   &addr);
> > > +					   &addr, NULL);
> > >  		if (ret)
> > >  			continue;
> > >  
> > > diff --git a/drivers/pci/pci_mvebu.c b/drivers/pci/pci_mvebu.c
> > > index 93a7508d8a2..25878bde534 100644
> > > --- a/drivers/pci/pci_mvebu.c
> > > +++ b/drivers/pci/pci_mvebu.c
> > > @@ -640,7 +640,8 @@ static int mvebu_pcie_port_parse_dt(ofnode node, ofnode parent, struct mvebu_pci
> > >  		pcie->is_x4 = true;
> > >  
> > >  	/* devfn is in bits [15:8], see PCI_DEV usage */
> > > -	ret = ofnode_read_pci_addr(node, FDT_PCI_SPACE_CONFIG, "reg", &pci_addr);
> > > +	ret = ofnode_read_pci_addr(node, FDT_PCI_SPACE_CONFIG, "reg", &pci_addr,
> > > +				   NULL);
> > >  	if (ret < 0) {
> > >  		printf("%s: property \"reg\" is invalid\n", pcie->name);
> > >  		goto err;
> > > diff --git a/drivers/pci/pci_tegra.c b/drivers/pci/pci_tegra.c
> > > index 29d54117e93..ae90bd2fbf1 100644
> > > --- a/drivers/pci/pci_tegra.c
> > > +++ b/drivers/pci/pci_tegra.c
> > > @@ -461,7 +461,7 @@ static int tegra_pcie_parse_port_info(ofnode node, uint *index, uint *lanes)
> > >  
> > >  	*lanes = err;
> > >  
> > > -	err = ofnode_read_pci_addr(node, 0, "reg", &addr);
> > > +	err = ofnode_read_pci_addr(node, 0, "reg", &addr, NULL);
> > >  	if (err < 0) {
> > >  		pr_err("failed to parse \"reg\" property\n");
> > >  		return err;
> > > diff --git a/drivers/pci/pcie_mediatek.c b/drivers/pci/pcie_mediatek.c
> > > index c6e30e24622..e59ebd13ad0 100644
> > > --- a/drivers/pci/pcie_mediatek.c
> > > +++ b/drivers/pci/pcie_mediatek.c
> > > @@ -660,7 +660,7 @@ static int mtk_pcie_probe(struct udevice *dev)
> > >  		if (!ofnode_is_enabled(subnode))
> > >  			continue;
> > >  
> > > -		err = ofnode_read_pci_addr(subnode, 0, "reg", &addr);
> > > +		err = ofnode_read_pci_addr(subnode, 0, "reg", &addr, NULL);
> > >  		if (err)
> > >  			return err;
> > >  
> > > @@ -699,7 +699,7 @@ static int mtk_pcie_probe_v2(struct udevice *dev)
> > >  		if (!ofnode_is_enabled(subnode))
> > >  			continue;
> > >  
> > > -		err = ofnode_read_pci_addr(subnode, 0, "reg", &addr);
> > > +		err = ofnode_read_pci_addr(subnode, 0, "reg", &addr, NULL);
> > >  		if (err)
> > >  			return err;
> > >  
> > > diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
> > > index eab9537fbae..a349e5e132a 100644
> > > --- a/drivers/serial/ns16550.c
> > > +++ b/drivers/serial/ns16550.c
> > > @@ -479,6 +479,7 @@ static int ns16550_serial_getinfo(struct udevice *dev,
> > >  	info->addr_space = SERIAL_ADDRESS_SPACE_MEMORY;
> > >  #endif
> > >  	info->addr = plat->base;
> > > +	info->size = plat->size;
> > >  	info->reg_width = plat->reg_width;
> > >  	info->reg_shift = plat->reg_shift;
> > >  	info->reg_offset = plat->reg_offset;
> > > @@ -487,7 +488,8 @@ static int ns16550_serial_getinfo(struct udevice *dev,
> > >  	return 0;
> > >  }
> > >  
> > > -static int ns16550_serial_assign_base(struct ns16550_plat *plat, fdt_addr_t base)
> > > +static int ns16550_serial_assign_base(struct ns16550_plat *plat,
> > > +				      fdt_addr_t base, fdt_size_t size)
> > >  {
> > >  	if (base == FDT_ADDR_T_NONE)
> > >  		return -EINVAL;
> > > @@ -497,6 +499,7 @@ static int ns16550_serial_assign_base(struct ns16550_plat *plat, fdt_addr_t base
> > >  #else
> > >  	plat->base = (unsigned long)map_physmem(base, 0, MAP_NOCACHE);
> > >  #endif
> > > +	plat->size = size;
> > >  
> > >  	return 0;
> > >  }
> > > @@ -507,6 +510,7 @@ int ns16550_serial_probe(struct udevice *dev)
> > >  	struct ns16550 *const com_port = dev_get_priv(dev);
> > >  	struct reset_ctl_bulk reset_bulk;
> > >  	fdt_addr_t addr;
> > > +	fdt_addr_t size;
> > >  	int ret;
> > >  
> > >  	/*
> > > @@ -514,8 +518,8 @@ int ns16550_serial_probe(struct udevice *dev)
> > >  	 * or via a PCI bridge, assign plat->base before probing hardware.
> > >  	 */
> > >  	if (device_is_on_pci_bus(dev)) {
> > > -		addr = devfdt_get_addr_pci(dev);
> > > -		ret = ns16550_serial_assign_base(plat, addr);
> > > +		addr = devfdt_get_addr_pci(dev, &size);
> > > +		ret = ns16550_serial_assign_base(plat, addr, size);
> > >  		if (ret)
> > >  			return ret;
> > >  	}
> > > @@ -543,11 +547,12 @@ int ns16550_serial_of_to_plat(struct udevice *dev)
> > >  	struct ns16550_plat *plat = dev_get_plat(dev);
> > >  	const u32 port_type = dev_get_driver_data(dev);
> > >  	fdt_addr_t addr;
> > > +	fdt_size_t size;
> > >  	struct clk clk;
> > >  	int err;
> > >  
> > > -	addr = dev_read_addr(dev);
> > > -	err = ns16550_serial_assign_base(plat, addr);
> > > +	addr = dev_read_addr_size(dev, &size);
> > > +	err = ns16550_serial_assign_base(plat, addr, size);
> > >  	if (err && !device_is_on_pci_bus(dev))
> > >  		return err;
> > >  
> > > diff --git a/include/dm/fdtaddr.h b/include/dm/fdtaddr.h
> > > index dcdc19137cc..6d2fa8f1044 100644
> > > --- a/include/dm/fdtaddr.h
> > > +++ b/include/dm/fdtaddr.h
> > > @@ -168,8 +168,9 @@ fdt_addr_t devfdt_get_addr_size_name(const struct udevice *dev,
> > >   * devfdt_get_addr_pci() - Read an address and handle PCI address translation
> > >   *
> > >   * @dev: Device to read from
> > > + * @sizep: If non-NULL, returns size of address space
> > >   * Return: address or FDT_ADDR_T_NONE if not found
> > >   */
> > > -fdt_addr_t devfdt_get_addr_pci(const struct udevice *dev);
> > > +fdt_addr_t devfdt_get_addr_pci(const struct udevice *dev, fdt_size_t *sizep);
> > >  
> > >  #endif
> > > diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
> > > index 726d8f82ddf..97cad971611 100644
> > > --- a/include/dm/ofnode.h
> > > +++ b/include/dm/ofnode.h
> > > @@ -1152,13 +1152,15 @@ const uint8_t *ofnode_read_u8_array_ptr(ofnode node, const char *propname,
> > >   * @type:	pci address type (FDT_PCI_SPACE_xxx)
> > >   * @propname:	name of property to find
> > >   * @addr:	returns pci address in the form of fdt_pci_addr
> > > + * @size:	if non-null, returns register-space size
> > >   * Return:
> > >   * 0 if ok, -ENOENT if the property did not exist, -EINVAL if the
> > >   * format of the property was invalid, -ENXIO if the requested
> > >   * address type was not found
> > >   */
> > >  int ofnode_read_pci_addr(ofnode node, enum fdt_pci_space type,
> > > -			 const char *propname, struct fdt_pci_addr *addr);
> > > +			 const char *propname, struct fdt_pci_addr *addr,
> > > +			 fdt_size_t *size);
> > >  
> > >  /**
> > >   * ofnode_read_pci_vendev() - look up PCI vendor and device id
> > > diff --git a/include/dm/read.h b/include/dm/read.h
> > > index c2615f72f40..3c2eea6f0c4 100644
> > > --- a/include/dm/read.h
> > > +++ b/include/dm/read.h
> > > @@ -346,9 +346,10 @@ void *dev_read_addr_ptr(const struct udevice *dev);
> > >   *    fdtdec_get_addr() and friends.
> > >   *
> > >   * @dev: Device to read from
> > > + * @sizep: If non-NULL, returns size of address space found
> > >   * Return: address or FDT_ADDR_T_NONE if not found
> > >   */
> > > -fdt_addr_t dev_read_addr_pci(const struct udevice *dev);
> > > +fdt_addr_t dev_read_addr_pci(const struct udevice *dev, fdt_size_t *sizep);
> > >  
> > >  /**
> > >   * dev_remap_addr() - Get the reg property of a device as a
> > > @@ -996,9 +997,10 @@ static inline void *dev_read_addr_ptr(const struct udevice *dev)
> > >  	return devfdt_get_addr_ptr(dev);
> > >  }
> > >  
> > > -static inline fdt_addr_t dev_read_addr_pci(const struct udevice *dev)
> > > +static inline fdt_addr_t dev_read_addr_pci(const struct udevice *dev,
> > > +					   fdt_size_t *sizep)
> > >  {
> > > -	return devfdt_get_addr_pci(dev);
> > > +	return devfdt_get_addr_pci(dev, sizep);
> > >  }
> > >  
> > >  static inline void *dev_remap_addr(const struct udevice *dev)
> > > diff --git a/include/ns16550.h b/include/ns16550.h
> > > index e7e68663d03..7f481300083 100644
> > > --- a/include/ns16550.h
> > > +++ b/include/ns16550.h
> > > @@ -58,6 +58,7 @@ enum ns16550_flags {
> > >   * struct ns16550_plat - information about a NS16550 port
> > >   *
> > >   * @base:		Base register address
> > > + * @size:		Size of register area in bytes
> > >   * @reg_width:		IO accesses size of registers (in bytes, 1 or 4)
> > >   * @reg_shift:		Shift size of registers (0=byte, 1=16bit, 2=32bit...)
> > >   * @reg_offset:		Offset to start of registers (normally 0)
> > > @@ -67,7 +68,8 @@ enum ns16550_flags {
> > >   * @bdf:		PCI slot/function (pci_dev_t)
> > >   */
> > >  struct ns16550_plat {
> > > -	unsigned long base;
> > > +	ulong base;
> > > +	ulong size;
> > >  	int reg_width;
> > >  	int reg_shift;
> > >  	int reg_offset;
> > > diff --git a/include/serial.h b/include/serial.h
> > > index 42bdf3759c0..205889d28be 100644
> > > --- a/include/serial.h
> > > +++ b/include/serial.h
> > > @@ -137,6 +137,7 @@ enum adr_space_type {
> > >   * @type:	type of the UART chip
> > >   * @addr_space:	address space to access the registers
> > >   * @addr:	physical address of the registers
> > > + * @size:	size of the register area in bytes
> > >   * @reg_width:	size (in bytes) of the IO accesses to the registers
> > >   * @reg_offset:	offset to apply to the @addr from the start of the registers
> > >   * @reg_shift:	quantity to shift the register offsets by
> > > @@ -147,6 +148,7 @@ struct serial_device_info {
> > >  	enum serial_chip_type type;
> > >  	enum adr_space_type addr_space;
> > >  	ulong addr;
> > > +	ulong size;
> > >  	u8 reg_width;
> > >  	u8 reg_offset;
> > >  	u8 reg_shift;
> > > diff --git a/test/dm/pci.c b/test/dm/pci.c
> > > index 70a736cfdb8..8c5e7da9e62 100644
> > > --- a/test/dm/pci.c
> > > +++ b/test/dm/pci.c
> > > @@ -301,10 +301,12 @@ static int dm_test_pci_addr_flat(struct unit_test_state *uts)
> > >  {
> > >  	struct udevice *swap1f, *swap1;
> > >  	ulong io_addr, mem_addr;
> > > +	fdt_addr_t size;
> > >  
> > >  	ut_assertok(dm_pci_bus_find_bdf(PCI_BDF(0, 0x1f, 0), &swap1f));
> > >  	io_addr = dm_pci_read_bar32(swap1f, 0);
> > > -	ut_asserteq(io_addr, dev_read_addr_pci(swap1f));
> > > +	ut_asserteq(io_addr, dev_read_addr_pci(swap1f, &size));
> > > +	ut_asserteq(0, size);
> > >  
> > >  	/*
> > >  	 * This device has both I/O and MEM spaces but the MEM space appears
> > > @@ -312,7 +314,8 @@ static int dm_test_pci_addr_flat(struct unit_test_state *uts)
> > >  	 */
> > >  	ut_assertok(dm_pci_bus_find_bdf(PCI_BDF(0, 0x1, 0), &swap1));
> > >  	mem_addr = dm_pci_read_bar32(swap1, 1);
> > > -	ut_asserteq(mem_addr, dev_read_addr_pci(swap1));
> > > +	ut_asserteq(mem_addr, dev_read_addr_pci(swap1, &size));
> > > +	ut_asserteq(0, size);
> > >  
> > >  	return 0;
> > >  }
> > > @@ -329,12 +332,15 @@ DM_TEST(dm_test_pci_addr_flat, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT |
> > >  static int dm_test_pci_addr_live(struct unit_test_state *uts)
> > >  {
> > >  	struct udevice *swap1f, *swap1;
> > > +	fdt_size_t size;
> > >  
> > >  	ut_assertok(dm_pci_bus_find_bdf(PCI_BDF(0, 0x1f, 0), &swap1f));
> > > -	ut_asserteq_64(FDT_ADDR_T_NONE, dev_read_addr_pci(swap1f));
> > > +	ut_asserteq_64(FDT_ADDR_T_NONE, dev_read_addr_pci(swap1f, &size));
> > > +	ut_asserteq(0, size);
> > >  
> > >  	ut_assertok(dm_pci_bus_find_bdf(PCI_BDF(0, 0x1, 0), &swap1));
> > > -	ut_asserteq_64(FDT_ADDR_T_NONE, dev_read_addr_pci(swap1));
> > > +	ut_asserteq_64(FDT_ADDR_T_NONE, dev_read_addr_pci(swap1, &size));
> > > +	ut_asserteq(0, size);
> > >  
> > >  	return 0;
> > >  }
> > > -- 
> > > 2.42.0.rc2.253.gd59a3bf2b4-goog
> > >