| Message ID | 20200314001132.17393-4-atish.patra@wdc.com |
|---|---|
| State | Superseded |
| Delegated to: | Andes |
| Headers | show |
| Series | DT related fixes for RISC-V UEFI | expand |
On Fri, Mar 13, 2020 at 5:12 PM Atish Patra <atish.patra@wdc.com> wrote: > > In RISC-V, M-mode software can reserve physical memory regions > by setting appropriate physical memory protection (PMP) csr. As the > PMP csr are accessible only in M-mode, S-mode U-Boot can not read > this configuration directly. However, M-mode software can pass this > information via reserved-memory node in device tree so that S-mode > software can access this information. > > In U-boot, any board may use the DT in following ways. > 1. OF_SEPARTE: It ignores the DT from previous stage and uses the DT > from U-Boot sources. > 2. OF_PRIOR_STATE: It reuses the DT from previous stage. > For case 1: U-Boot needs to parse the reserved-memory node from the > DT passed from the previous stage and update the DT in use. > > This patch provides a framework to do that from any RISC-V boards. > > Signed-off-by: Atish Patra <atish.patra@wdc.com> > --- > arch/riscv/cpu/start.S | 1 + > arch/riscv/include/asm/global_data.h | 1 + > arch/riscv/include/asm/u-boot-riscv.h | 1 + > arch/riscv/lib/asm-offsets.c | 1 + > arch/riscv/lib/bootm.c | 37 +++++++++++++++++++++++++++ > 5 files changed, 41 insertions(+) > > diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S > index 6b3ff99c3882..0282685c2906 100644 > --- a/arch/riscv/cpu/start.S > +++ b/arch/riscv/cpu/start.S > @@ -121,6 +121,7 @@ call_board_init_f_0: > > jal board_init_f_init_reserve > > + SREG s1, GD_FIRMWARE_FDT_ADDR(gp) > /* save the boot hart id to global_data */ > SREG tp, GD_BOOT_HART(gp) > > diff --git a/arch/riscv/include/asm/global_data.h b/arch/riscv/include/asm/global_data.h > index b74bd7e738bb..51ac8d1c98e2 100644 > --- a/arch/riscv/include/asm/global_data.h > +++ b/arch/riscv/include/asm/global_data.h > @@ -15,6 +15,7 @@ > /* Architecture-specific global data */ > struct arch_global_data { > long boot_hart; /* boot hart id */ > + phys_addr_t firmware_fdt_addr; > #ifdef CONFIG_SIFIVE_CLINT > void __iomem *clint; /* clint base address */ > #endif > diff --git a/arch/riscv/include/asm/u-boot-riscv.h b/arch/riscv/include/asm/u-boot-riscv.h > index 49febd588102..b7bea0ba184d 100644 > --- a/arch/riscv/include/asm/u-boot-riscv.h > +++ b/arch/riscv/include/asm/u-boot-riscv.h > @@ -17,5 +17,6 @@ int cleanup_before_linux(void); > /* board/.../... */ > int board_init(void); > void board_quiesce_devices(void); > +int riscv_board_reserved_mem_fixup(void *fdt); > > #endif /* _U_BOOT_RISCV_H_ */ > diff --git a/arch/riscv/lib/asm-offsets.c b/arch/riscv/lib/asm-offsets.c > index 4fa4fd371473..7301c1b98e23 100644 > --- a/arch/riscv/lib/asm-offsets.c > +++ b/arch/riscv/lib/asm-offsets.c > @@ -14,6 +14,7 @@ > int main(void) > { > DEFINE(GD_BOOT_HART, offsetof(gd_t, arch.boot_hart)); > + DEFINE(GD_FIRMWARE_FDT_ADDR, offsetof(gd_t, arch.firmware_fdt_addr)); > #ifndef CONFIG_XIP > DEFINE(GD_AVAILABLE_HARTS, offsetof(gd_t, arch.available_harts)); > #endif > diff --git a/arch/riscv/lib/bootm.c b/arch/riscv/lib/bootm.c > index f927694ae32f..3a4d0bf14c86 100644 > --- a/arch/riscv/lib/bootm.c > +++ b/arch/riscv/lib/bootm.c > @@ -19,6 +19,7 @@ > #include <dm/device.h> > #include <dm/root.h> > #include <u-boot/zlib.h> > +#include <mapmem.h> > > DECLARE_GLOBAL_DATA_PTR; > > @@ -26,6 +27,42 @@ __weak void board_quiesce_devices(void) > { > } > > +int riscv_board_reserved_mem_fixup(void *fdt) > +{ > + uint32_t phandle; > + struct fdt_memory pmp_mem; > + int err; > + void *src_fdt_addr; > + int offset, node; > + phys_addr_t addr, size; > + > + src_fdt_addr = map_sysmem(gd->arch.firmware_fdt_addr, 0); > + offset = fdt_path_offset(src_fdt_addr, "/reserved-memory"); > + if (offset < 0) { > + printf("No reserved memory region found in FDT\n"); > + return offset; > + } > + > + fdt_for_each_subnode(node, src_fdt_addr, offset) { > + const char *name = fdt_get_name(src_fdt_addr, node, NULL); > + > + addr = fdtdec_get_addr_size(src_fdt_addr, node, "reg", &size); > + if (addr == FDT_ADDR_T_NONE) { > + debug("failed to read address/size for %s\n", name); > + continue; > + } > + pmp_mem.start = addr; > + pmp_mem.end = addr + size; > + err = fdtdec_add_reserved_memory(fdt, name, &pmp_mem, &phandle); > + if (err < 0) { > + printf("failed to add reserved memory: %d\n", err); > + return err; > + } > + } > + > + return 0; > +} > + > int arch_fixup_fdt(void *blob) > { > u32 size; > -- > 2.25.1 > Fixed palmer's email address. Sorry for the spam.
Hi Atish, On Sat, Mar 14, 2020 at 8:54 AM Atish Patra <atishp@atishpatra.org> wrote: > > On Fri, Mar 13, 2020 at 5:12 PM Atish Patra <atish.patra@wdc.com> wrote: > > > > In RISC-V, M-mode software can reserve physical memory regions > > by setting appropriate physical memory protection (PMP) csr. As the > > PMP csr are accessible only in M-mode, S-mode U-Boot can not read > > this configuration directly. However, M-mode software can pass this > > information via reserved-memory node in device tree so that S-mode > > software can access this information. > > > > In U-boot, any board may use the DT in following ways. nits: U-Boot > > 1. OF_SEPARTE: It ignores the DT from previous stage and uses the DT typo: OF_SEPARATE > > from U-Boot sources. > > 2. OF_PRIOR_STATE: It reuses the DT from previous stage. typo: OF_PRIOR_STAGE > > For case 1: U-Boot needs to parse the reserved-memory node from the > > DT passed from the previous stage and update the DT in use. > > > > This patch provides a framework to do that from any RISC-V boards. > > > > Signed-off-by: Atish Patra <atish.patra@wdc.com> > > --- > > arch/riscv/cpu/start.S | 1 + > > arch/riscv/include/asm/global_data.h | 1 + > > arch/riscv/include/asm/u-boot-riscv.h | 1 + > > arch/riscv/lib/asm-offsets.c | 1 + > > arch/riscv/lib/bootm.c | 37 +++++++++++++++++++++++++++ > > 5 files changed, 41 insertions(+) > > > > diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S > > index 6b3ff99c3882..0282685c2906 100644 > > --- a/arch/riscv/cpu/start.S > > +++ b/arch/riscv/cpu/start.S > > @@ -121,6 +121,7 @@ call_board_init_f_0: > > > > jal board_init_f_init_reserve > > > > + SREG s1, GD_FIRMWARE_FDT_ADDR(gp) > > /* save the boot hart id to global_data */ > > SREG tp, GD_BOOT_HART(gp) > > > > diff --git a/arch/riscv/include/asm/global_data.h b/arch/riscv/include/asm/global_data.h > > index b74bd7e738bb..51ac8d1c98e2 100644 > > --- a/arch/riscv/include/asm/global_data.h > > +++ b/arch/riscv/include/asm/global_data.h > > @@ -15,6 +15,7 @@ > > /* Architecture-specific global data */ > > struct arch_global_data { > > long boot_hart; /* boot hart id */ > > + phys_addr_t firmware_fdt_addr; > > #ifdef CONFIG_SIFIVE_CLINT > > void __iomem *clint; /* clint base address */ > > #endif > > diff --git a/arch/riscv/include/asm/u-boot-riscv.h b/arch/riscv/include/asm/u-boot-riscv.h > > index 49febd588102..b7bea0ba184d 100644 > > --- a/arch/riscv/include/asm/u-boot-riscv.h > > +++ b/arch/riscv/include/asm/u-boot-riscv.h > > @@ -17,5 +17,6 @@ int cleanup_before_linux(void); > > /* board/.../... */ > > int board_init(void); > > void board_quiesce_devices(void); > > +int riscv_board_reserved_mem_fixup(void *fdt); > > > > #endif /* _U_BOOT_RISCV_H_ */ > > diff --git a/arch/riscv/lib/asm-offsets.c b/arch/riscv/lib/asm-offsets.c > > index 4fa4fd371473..7301c1b98e23 100644 > > --- a/arch/riscv/lib/asm-offsets.c > > +++ b/arch/riscv/lib/asm-offsets.c > > @@ -14,6 +14,7 @@ > > int main(void) > > { > > DEFINE(GD_BOOT_HART, offsetof(gd_t, arch.boot_hart)); > > + DEFINE(GD_FIRMWARE_FDT_ADDR, offsetof(gd_t, arch.firmware_fdt_addr)); > > #ifndef CONFIG_XIP > > DEFINE(GD_AVAILABLE_HARTS, offsetof(gd_t, arch.available_harts)); > > #endif > > diff --git a/arch/riscv/lib/bootm.c b/arch/riscv/lib/bootm.c > > index f927694ae32f..3a4d0bf14c86 100644 > > --- a/arch/riscv/lib/bootm.c > > +++ b/arch/riscv/lib/bootm.c > > @@ -19,6 +19,7 @@ > > #include <dm/device.h> > > #include <dm/root.h> > > #include <u-boot/zlib.h> > > +#include <mapmem.h> > > > > DECLARE_GLOBAL_DATA_PTR; > > > > @@ -26,6 +27,42 @@ __weak void board_quiesce_devices(void) > > { > > } > > > > +int riscv_board_reserved_mem_fixup(void *fdt) > > +{ > > + uint32_t phandle; > > + struct fdt_memory pmp_mem; > > + int err; > > + void *src_fdt_addr; > > + int offset, node; > > + phys_addr_t addr, size; > > + > > + src_fdt_addr = map_sysmem(gd->arch.firmware_fdt_addr, 0); > > + offset = fdt_path_offset(src_fdt_addr, "/reserved-memory"); > > + if (offset < 0) { > > + printf("No reserved memory region found in FDT\n"); > > + return offset; We should return 0 to allow cases that do not have /reserved-memory node. Otherwise we are mandating a newer OpenSBI version to work with us. > > + } > > + > > + fdt_for_each_subnode(node, src_fdt_addr, offset) { > > + const char *name = fdt_get_name(src_fdt_addr, node, NULL); > > + > > + addr = fdtdec_get_addr_size(src_fdt_addr, node, "reg", &size); > > + if (addr == FDT_ADDR_T_NONE) { > > + debug("failed to read address/size for %s\n", name); > > + continue; > > + } > > + pmp_mem.start = addr; > > + pmp_mem.end = addr + size; > > + err = fdtdec_add_reserved_memory(fdt, name, &pmp_mem, &phandle); > > + if (err < 0) { > > + printf("failed to add reserved memory: %d\n", err); > > + return err; > > + } > > + } > > + > > + return 0; > > +} > > + > > int arch_fixup_fdt(void *blob) > > { > > u32 size; > > -- Regards, Bin
On Sat, Mar 14, 2020 at 3:00 AM Bin Meng <bmeng.cn@gmail.com> wrote: > > Hi Atish, > > On Sat, Mar 14, 2020 at 8:54 AM Atish Patra <atishp@atishpatra.org> wrote: > > > > On Fri, Mar 13, 2020 at 5:12 PM Atish Patra <atish.patra@wdc.com> wrote: > > > > > > In RISC-V, M-mode software can reserve physical memory regions > > > by setting appropriate physical memory protection (PMP) csr. As the > > > PMP csr are accessible only in M-mode, S-mode U-Boot can not read > > > this configuration directly. However, M-mode software can pass this > > > information via reserved-memory node in device tree so that S-mode > > > software can access this information. > > > > > > In U-boot, any board may use the DT in following ways. > > nits: U-Boot > > > > 1. OF_SEPARTE: It ignores the DT from previous stage and uses the DT > > typo: OF_SEPARATE > > > > from U-Boot sources. > > > 2. OF_PRIOR_STATE: It reuses the DT from previous stage. > > typo: OF_PRIOR_STAGE > > > > For case 1: U-Boot needs to parse the reserved-memory node from the > > > DT passed from the previous stage and update the DT in use. > > > > > > This patch provides a framework to do that from any RISC-V boards. > > > > > > Signed-off-by: Atish Patra <atish.patra@wdc.com> > > > --- > > > arch/riscv/cpu/start.S | 1 + > > > arch/riscv/include/asm/global_data.h | 1 + > > > arch/riscv/include/asm/u-boot-riscv.h | 1 + > > > arch/riscv/lib/asm-offsets.c | 1 + > > > arch/riscv/lib/bootm.c | 37 +++++++++++++++++++++++++++ > > > 5 files changed, 41 insertions(+) > > > > > > diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S > > > index 6b3ff99c3882..0282685c2906 100644 > > > --- a/arch/riscv/cpu/start.S > > > +++ b/arch/riscv/cpu/start.S > > > @@ -121,6 +121,7 @@ call_board_init_f_0: > > > > > > jal board_init_f_init_reserve > > > > > > + SREG s1, GD_FIRMWARE_FDT_ADDR(gp) > > > /* save the boot hart id to global_data */ > > > SREG tp, GD_BOOT_HART(gp) > > > > > > diff --git a/arch/riscv/include/asm/global_data.h b/arch/riscv/include/asm/global_data.h > > > index b74bd7e738bb..51ac8d1c98e2 100644 > > > --- a/arch/riscv/include/asm/global_data.h > > > +++ b/arch/riscv/include/asm/global_data.h > > > @@ -15,6 +15,7 @@ > > > /* Architecture-specific global data */ > > > struct arch_global_data { > > > long boot_hart; /* boot hart id */ > > > + phys_addr_t firmware_fdt_addr; > > > #ifdef CONFIG_SIFIVE_CLINT > > > void __iomem *clint; /* clint base address */ > > > #endif > > > diff --git a/arch/riscv/include/asm/u-boot-riscv.h b/arch/riscv/include/asm/u-boot-riscv.h > > > index 49febd588102..b7bea0ba184d 100644 > > > --- a/arch/riscv/include/asm/u-boot-riscv.h > > > +++ b/arch/riscv/include/asm/u-boot-riscv.h > > > @@ -17,5 +17,6 @@ int cleanup_before_linux(void); > > > /* board/.../... */ > > > int board_init(void); > > > void board_quiesce_devices(void); > > > +int riscv_board_reserved_mem_fixup(void *fdt); > > > > > > #endif /* _U_BOOT_RISCV_H_ */ > > > diff --git a/arch/riscv/lib/asm-offsets.c b/arch/riscv/lib/asm-offsets.c > > > index 4fa4fd371473..7301c1b98e23 100644 > > > --- a/arch/riscv/lib/asm-offsets.c > > > +++ b/arch/riscv/lib/asm-offsets.c > > > @@ -14,6 +14,7 @@ > > > int main(void) > > > { > > > DEFINE(GD_BOOT_HART, offsetof(gd_t, arch.boot_hart)); > > > + DEFINE(GD_FIRMWARE_FDT_ADDR, offsetof(gd_t, arch.firmware_fdt_addr)); > > > #ifndef CONFIG_XIP > > > DEFINE(GD_AVAILABLE_HARTS, offsetof(gd_t, arch.available_harts)); > > > #endif > > > diff --git a/arch/riscv/lib/bootm.c b/arch/riscv/lib/bootm.c > > > index f927694ae32f..3a4d0bf14c86 100644 > > > --- a/arch/riscv/lib/bootm.c > > > +++ b/arch/riscv/lib/bootm.c > > > @@ -19,6 +19,7 @@ > > > #include <dm/device.h> > > > #include <dm/root.h> > > > #include <u-boot/zlib.h> > > > +#include <mapmem.h> > > > > > > DECLARE_GLOBAL_DATA_PTR; > > > > > > @@ -26,6 +27,42 @@ __weak void board_quiesce_devices(void) > > > { > > > } > > > > > > +int riscv_board_reserved_mem_fixup(void *fdt) > > > +{ > > > + uint32_t phandle; > > > + struct fdt_memory pmp_mem; > > > + int err; > > > + void *src_fdt_addr; > > > + int offset, node; > > > + phys_addr_t addr, size; > > > + > > > + src_fdt_addr = map_sysmem(gd->arch.firmware_fdt_addr, 0); > > > + offset = fdt_path_offset(src_fdt_addr, "/reserved-memory"); > > > + if (offset < 0) { > > > + printf("No reserved memory region found in FDT\n"); > > > + return offset; > > We should return 0 to allow cases that do not have /reserved-memory > node. Otherwise we are mandating a newer OpenSBI version to work with > us. > Correct. I will update the patch along with the nit fixes you suggested above. > > > + } > > > + > > > + fdt_for_each_subnode(node, src_fdt_addr, offset) { > > > + const char *name = fdt_get_name(src_fdt_addr, node, NULL); > > > + > > > + addr = fdtdec_get_addr_size(src_fdt_addr, node, "reg", &size); > > > + if (addr == FDT_ADDR_T_NONE) { > > > + debug("failed to read address/size for %s\n", name); > > > + continue; > > > + } > > > + pmp_mem.start = addr; > > > + pmp_mem.end = addr + size; > > > + err = fdtdec_add_reserved_memory(fdt, name, &pmp_mem, &phandle); > > > + if (err < 0) { > > > + printf("failed to add reserved memory: %d\n", err); > > > + return err; > > > + } > > > + } > > > + > > > + return 0; > > > +} > > > + > > > int arch_fixup_fdt(void *blob) > > > { > > > u32 size; > > > -- > > Regards, > Bin
diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S index 6b3ff99c3882..0282685c2906 100644 --- a/arch/riscv/cpu/start.S +++ b/arch/riscv/cpu/start.S @@ -121,6 +121,7 @@ call_board_init_f_0: jal board_init_f_init_reserve + SREG s1, GD_FIRMWARE_FDT_ADDR(gp) /* save the boot hart id to global_data */ SREG tp, GD_BOOT_HART(gp) diff --git a/arch/riscv/include/asm/global_data.h b/arch/riscv/include/asm/global_data.h index b74bd7e738bb..51ac8d1c98e2 100644 --- a/arch/riscv/include/asm/global_data.h +++ b/arch/riscv/include/asm/global_data.h @@ -15,6 +15,7 @@ /* Architecture-specific global data */ struct arch_global_data { long boot_hart; /* boot hart id */ + phys_addr_t firmware_fdt_addr; #ifdef CONFIG_SIFIVE_CLINT void __iomem *clint; /* clint base address */ #endif diff --git a/arch/riscv/include/asm/u-boot-riscv.h b/arch/riscv/include/asm/u-boot-riscv.h index 49febd588102..b7bea0ba184d 100644 --- a/arch/riscv/include/asm/u-boot-riscv.h +++ b/arch/riscv/include/asm/u-boot-riscv.h @@ -17,5 +17,6 @@ int cleanup_before_linux(void); /* board/.../... */ int board_init(void); void board_quiesce_devices(void); +int riscv_board_reserved_mem_fixup(void *fdt); #endif /* _U_BOOT_RISCV_H_ */ diff --git a/arch/riscv/lib/asm-offsets.c b/arch/riscv/lib/asm-offsets.c index 4fa4fd371473..7301c1b98e23 100644 --- a/arch/riscv/lib/asm-offsets.c +++ b/arch/riscv/lib/asm-offsets.c @@ -14,6 +14,7 @@ int main(void) { DEFINE(GD_BOOT_HART, offsetof(gd_t, arch.boot_hart)); + DEFINE(GD_FIRMWARE_FDT_ADDR, offsetof(gd_t, arch.firmware_fdt_addr)); #ifndef CONFIG_XIP DEFINE(GD_AVAILABLE_HARTS, offsetof(gd_t, arch.available_harts)); #endif diff --git a/arch/riscv/lib/bootm.c b/arch/riscv/lib/bootm.c index f927694ae32f..3a4d0bf14c86 100644 --- a/arch/riscv/lib/bootm.c +++ b/arch/riscv/lib/bootm.c @@ -19,6 +19,7 @@ #include <dm/device.h> #include <dm/root.h> #include <u-boot/zlib.h> +#include <mapmem.h> DECLARE_GLOBAL_DATA_PTR; @@ -26,6 +27,42 @@ __weak void board_quiesce_devices(void) { } +int riscv_board_reserved_mem_fixup(void *fdt) +{ + uint32_t phandle; + struct fdt_memory pmp_mem; + int err; + void *src_fdt_addr; + int offset, node; + phys_addr_t addr, size; + + src_fdt_addr = map_sysmem(gd->arch.firmware_fdt_addr, 0); + offset = fdt_path_offset(src_fdt_addr, "/reserved-memory"); + if (offset < 0) { + printf("No reserved memory region found in FDT\n"); + return offset; + } + + fdt_for_each_subnode(node, src_fdt_addr, offset) { + const char *name = fdt_get_name(src_fdt_addr, node, NULL); + + addr = fdtdec_get_addr_size(src_fdt_addr, node, "reg", &size); + if (addr == FDT_ADDR_T_NONE) { + debug("failed to read address/size for %s\n", name); + continue; + } + pmp_mem.start = addr; + pmp_mem.end = addr + size; + err = fdtdec_add_reserved_memory(fdt, name, &pmp_mem, &phandle); + if (err < 0) { + printf("failed to add reserved memory: %d\n", err); + return err; + } + } + + return 0; +} + int arch_fixup_fdt(void *blob) { u32 size;
In RISC-V, M-mode software can reserve physical memory regions by setting appropriate physical memory protection (PMP) csr. As the PMP csr are accessible only in M-mode, S-mode U-Boot can not read this configuration directly. However, M-mode software can pass this information via reserved-memory node in device tree so that S-mode software can access this information. In U-boot, any board may use the DT in following ways. 1. OF_SEPARTE: It ignores the DT from previous stage and uses the DT from U-Boot sources. 2. OF_PRIOR_STATE: It reuses the DT from previous stage. For case 1: U-Boot needs to parse the reserved-memory node from the DT passed from the previous stage and update the DT in use. This patch provides a framework to do that from any RISC-V boards. Signed-off-by: Atish Patra <atish.patra@wdc.com> --- arch/riscv/cpu/start.S | 1 + arch/riscv/include/asm/global_data.h | 1 + arch/riscv/include/asm/u-boot-riscv.h | 1 + arch/riscv/lib/asm-offsets.c | 1 + arch/riscv/lib/bootm.c | 37 +++++++++++++++++++++++++++ 5 files changed, 41 insertions(+)