[PATCH umr] Add ability to read/write SMC registers directly (v2)

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On SI..VI platforms this allows access to SMC registers without kernel access.

Signed-off-by: Tom St Denis <tom.stdenis at amd.com>

(v2):  Use difference instances of accessors to SMC as well as properly break out
use_pci/!use_pci support in the umr_read_smc/umr_write_smc functions.
---
 src/app/main.c        |   4 +-
 src/app/scan.c        |   4 +-
 src/lib/mmio.c        | 128 +++++++++++++++++++++++++++++++++++++++++---------
 src/lib/read_sgpr.c   |   4 +-
 src/lib/read_vram.c   |   6 +--
 src/lib/wave_status.c |   8 ++--
 src/umr.h             |   4 +-
 7 files changed, 121 insertions(+), 37 deletions(-)

diff --git a/src/app/main.c b/src/app/main.c
index 60bf20480fd3..bcca76225727 100644
--- a/src/app/main.c
+++ b/src/app/main.c
@@ -224,7 +224,7 @@ int main(int argc, char **argv)
 				if (!asic)
 					asic = get_asic();
 				if (!memcmp(argv[i+1], "0x", 2) && sscanf(argv[i+1], "%"SCNx32, &reg) == 1 && sscanf(argv[i+2], "%"SCNx32, &val) == 1)
-					umr_write_reg(asic, reg, val);
+					umr_write_reg(asic, reg, val, REG_MMIO);
 				else
 					umr_set_register(asic, argv[i+1], argv[i+2]);
 				i += 2;
@@ -271,7 +271,7 @@ int main(int argc, char **argv)
 					asic = get_asic();
 
 				if (!memcmp(argv[i+1], "0x", 2) && sscanf(argv[i+1], "%"SCNx32, &reg) == 1) {
-					reg = umr_read_reg(asic, reg);
+					reg = umr_read_reg(asic, reg, REG_MMIO);
 					printf("0x%08lx\n", (unsigned long)reg);
 				} else {
 					str = strstr(argv[i+1], ".");
diff --git a/src/app/scan.c b/src/app/scan.c
index 0e1f9e3f94b5..29a3e46ba3f7 100644
--- a/src/app/scan.c
+++ b/src/app/scan.c
@@ -87,10 +87,10 @@ int umr_scan_asic(struct umr_asic *asic, char *asicname, char *ipname, char *reg
 								r = -1;
 								goto error;
 							}
-						} else if (asic->blocks[i]->regs[j].type == REG_MMIO) {
+						} else if (asic->blocks[i]->regs[j].type == REG_MMIO || asic->blocks[i]->regs[j].type == REG_SMC) {
 							if (options.use_bank && options.no_kernel)
 								umr_grbm_select_index(asic, options.se_bank, options.sh_bank, options.instance_bank);
-							asic->blocks[i]->regs[j].value = umr_read_reg(asic, asic->blocks[i]->regs[j].addr * 4);
+							asic->blocks[i]->regs[j].value = umr_read_reg(asic, asic->blocks[i]->regs[j].addr * (asic->blocks[i]->regs[j].type == REG_MMIO ? 4 : 1), asic->blocks[i]->regs[j].type);
 							if (options.use_bank && options.no_kernel)
 								umr_grbm_select_index(asic, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF);
 						}
diff --git a/src/lib/mmio.c b/src/lib/mmio.c
index 22110e09a9b4..dfd9f0d33e5d 100644
--- a/src/lib/mmio.c
+++ b/src/lib/mmio.c
@@ -24,36 +24,55 @@
  */
 #include "umr.h"
 
-uint32_t umr_read_reg(struct umr_asic *asic, uint64_t addr)
+static uint32_t umr_smc_read(struct umr_asic *asic, uint64_t addr)
 {
-	uint32_t value=0;
-	if (addr == 0xFFFFFFFF)
-		fprintf(stderr, "[BUG]: reading from addr==0xFFFFFFFF is likely a bug\n");
-
-	if (asic->pci.mem && !(addr & ~0xFFFFFULL)) { // only use pci if enabled and not using high bits 
-		return asic->pci.mem[addr/4];
+	uint32_t value;
+	if (asic->options.use_pci) {
+		switch (asic->config.gfx.family) {
+			case 110: // SI
+			case 120: // CIK
+			case 130: // VI
+				umr_write_reg_by_name(asic, "mmSMC_IND_INDEX_1", addr);
+				return umr_read_reg_by_name(asic, "mmSMC_IND_DATA_1");
+			case 135: // CZ
+				umr_write_reg_by_name(asic, "mmMP0PUB_IND_INDEX_1", addr);
+				return umr_read_reg_by_name(asic, "mmMP0PUB_IND_DATA_1");
+			default:
+				fprintf(stderr, "[BUG] Unsupported family type in umr_smc_read()\n");
+				return 0;
+		}
 	} else {
-		if (lseek(asic->fd.mmio, addr, SEEK_SET) < 0)
-			perror("Cannot seek to MMIO address");
-		if (read(asic->fd.mmio, &value, 4) != 4)
-			perror("Cannot read from MMIO reg");
+		if (lseek(asic->fd.smc, addr, SEEK_SET) < 0)
+			perror("Cannot seek to SMC address");
+		if (read(asic->fd.smc, &value, 4) != 4)
+			perror("Cannot read from SMC reg");
 		return value;
 	}
+
 }
 
-int umr_write_reg(struct umr_asic *asic, uint64_t addr, uint32_t value)
+static uint32_t umr_smc_write(struct umr_asic *asic, uint64_t addr, uint32_t value)
 {
-	if (addr == 0xFFFFFFFF)
-		fprintf(stderr, "[BUG]: reading from addr==0xFFFFFFFF is likely a bug\n");
-
-	if (asic->pci.mem && !(addr & ~0xFFFFFULL)) {
-		asic->pci.mem[addr/4] = value;
+	if (asic->options.use_pci) {
+		switch (asic->config.gfx.family) {
+			case 110: // SI
+			case 120: // CIK
+			case 130: // VI
+				umr_write_reg_by_name(asic, "mmSMC_IND_INDEX_1", addr);
+				return umr_write_reg_by_name(asic, "mmSMC_IND_DATA_1", value);
+			case 135: // CZ
+				umr_write_reg_by_name(asic, "mmMP0PUB_IND_INDEX_1", addr);
+				return umr_write_reg_by_name(asic, "mmMP0PUB_IND_DATA_1", value);
+			default:
+				fprintf(stderr, "[BUG] Unsupported family type in umr_smc_read()\n");
+				return -1;
+		}
 	} else {
-		if (lseek(asic->fd.mmio, addr, SEEK_SET) < 0) {
+		if (lseek(asic->fd.smc, addr, SEEK_SET) < 0) {
 			perror("Cannot seek to MMIO address");
 			return -1;
 		}
-		if (write(asic->fd.mmio, &value, 4) != 4) {
+		if (write(asic->fd.smc, &value, 4) != 4) {
 			perror("Cannot write to MMIO reg");
 			return -1;
 		}
@@ -61,14 +80,79 @@ int umr_write_reg(struct umr_asic *asic, uint64_t addr, uint32_t value)
 	return 0;
 }
 
+uint32_t umr_read_reg(struct umr_asic *asic, uint64_t addr, enum regclass type)
+{
+	uint32_t value=0;
+	if (addr == 0xFFFFFFFF)
+		fprintf(stderr, "[BUG]: reading from addr==0xFFFFFFFF is likely a bug\n");
+
+	switch (type) {
+		case REG_MMIO:
+			if (asic->pci.mem && !(addr & ~0xFFFFFULL)) { // only use pci if enabled and not using high bits 
+				return asic->pci.mem[addr/4];
+			} else {
+				if (lseek(asic->fd.mmio, addr, SEEK_SET) < 0)
+					perror("Cannot seek to MMIO address");
+				if (read(asic->fd.mmio, &value, 4) != 4)
+					perror("Cannot read from MMIO reg");
+				return value;
+			}
+			break;
+		case REG_SMC:
+			return umr_smc_read(asic, addr);
+		default:
+			fprintf(stderr, "[BUG] Unsupported register type in umr_read_reg().\n");
+			return 0;
+	}
+}
+
+int umr_write_reg(struct umr_asic *asic, uint64_t addr, uint32_t value, enum regclass type)
+{
+	if (addr == 0xFFFFFFFF)
+		fprintf(stderr, "[BUG]: reading from addr==0xFFFFFFFF is likely a bug\n");
+
+	switch (type) {
+		case REG_MMIO:
+			if (asic->pci.mem && !(addr & ~0xFFFFFULL)) {
+				asic->pci.mem[addr/4] = value;
+			} else {
+				if (lseek(asic->fd.mmio, addr, SEEK_SET) < 0) {
+					perror("Cannot seek to MMIO address");
+					return -1;
+				}
+				if (write(asic->fd.mmio, &value, 4) != 4) {
+					perror("Cannot write to MMIO reg");
+					return -1;
+				}
+			}
+			break;
+		case REG_SMC:
+			return umr_smc_write(asic, addr, value);
+		default:
+			fprintf(stderr, "[BUG] Unsupported register type in umr_write_reg().\n");
+			return -1;
+	}
+	return 0;
+}
+
 uint32_t umr_read_reg_by_name(struct umr_asic *asic, char *name)
 {
-	return umr_read_reg(asic, umr_find_reg(asic, name) * 4);
+	struct umr_reg *reg;
+	reg = umr_find_reg_data(asic, name);
+	if (reg)
+		return umr_read_reg(asic, reg->addr * (reg->type == REG_MMIO ? 4 : 1), reg->type);
+	else
+		return 0;
 }
 
 int umr_write_reg_by_name(struct umr_asic *asic, char *name, uint32_t value)
 {
-	return umr_write_reg(asic, umr_find_reg(asic, name) * 4, value);
+	struct umr_reg *reg;
+	reg = umr_find_reg_data(asic, name);
+	if (reg)
+		return umr_write_reg(asic, reg->addr * (reg->type == REG_MMIO ? 4 : 1), value, reg->type);
+	else
+		return -1;
 }
 
 uint32_t umr_bitslice_reg(struct umr_asic *asic, struct umr_reg *reg, char *bitname, uint32_t regvalue)
@@ -141,7 +225,7 @@ int umr_grbm_select_index(struct umr_asic *asic, uint32_t se, uint32_t sh, uint3
 		} else {
 			data |= umr_bitslice_compose_value(asic, grbm_idx, "SH_INDEX", instance);
 		}
-		return umr_write_reg(asic, grbm_idx->addr * 4, data);
+		return umr_write_reg(asic, grbm_idx->addr * 4, data, REG_MMIO);
 	} else {
 		return -1;
 	}
diff --git a/src/lib/read_sgpr.c b/src/lib/read_sgpr.c
index 858657cc83c4..cceb189c1854 100644
--- a/src/lib/read_sgpr.c
+++ b/src/lib/read_sgpr.c
@@ -41,9 +41,9 @@ static void wave_read_regs_via_mmio(struct umr_asic *asic, uint32_t simd,
 		data |= umr_bitslice_compose_value(asic, ind_index, "THREAD_ID", thread);
 		data |= umr_bitslice_compose_value(asic, ind_index, "FORCE_READ", 1);
 		data |= umr_bitslice_compose_value(asic, ind_index, "AUTO_INCR", 1);
-		umr_write_reg(asic, ind_index->addr * 4, data);
+		umr_write_reg(asic, ind_index->addr * 4, data, REG_MMIO);
 		while (num--)
-			*(out++) = umr_read_reg(asic, ind_data->addr * 4);
+			*(out++) = umr_read_reg(asic, ind_data->addr * 4, REG_MMIO);
 	} else {
 		fprintf(stderr, "[BUG]: The required SQ_IND_{INDEX,DATA} registers are not found on the asic <%s>\n", asic->asicname);
 		return;
diff --git a/src/lib/read_vram.c b/src/lib/read_vram.c
index 502153dceaa5..3d458db8fa11 100644
--- a/src/lib/read_vram.c
+++ b/src/lib/read_vram.c
@@ -43,9 +43,9 @@ static void read_via_mmio(struct umr_asic *asic, uint64_t address, uint32_t size
 	}
 
 	while (size) {
-		umr_write_reg(asic, MM_INDEX, address | 0x80000000);
-		umr_write_reg(asic, MM_INDEX_HI, address >> 31);
-		*out++ = umr_read_reg(asic, MM_DATA);
+		umr_write_reg(asic, MM_INDEX, address | 0x80000000, REG_MMIO);
+		umr_write_reg(asic, MM_INDEX_HI, address >> 31, REG_MMIO);
+		*out++ = umr_read_reg(asic, MM_DATA, REG_MMIO);
 		size -= 4;
 		address += 4;
 	}
diff --git a/src/lib/wave_status.c b/src/lib/wave_status.c
index 27bd6a4c86ed..6b8098e69a09 100644
--- a/src/lib/wave_status.c
+++ b/src/lib/wave_status.c
@@ -42,8 +42,8 @@ static int umr_get_wave_sq_info_vi(struct umr_asic *asic, unsigned se, unsigned
 		return -1;
 	}
 
-	umr_write_reg(asic, index|bank, 8 << 16);
-	value = umr_read_reg(asic, data|bank);
+	umr_write_reg(asic, index|bank, 8 << 16, REG_MMIO);
+	value = umr_read_reg(asic, data|bank, REG_MMIO);
 	ws->sq_info.busy = value & 1;
 	ws->sq_info.wave_level = (value >> 4) & 0x3F;
 	return 0;
@@ -62,8 +62,8 @@ static uint32_t wave_read_ind(struct umr_asic *asic, uint32_t simd, uint32_t wav
 		data |= umr_bitslice_compose_value(asic, ind_index, "SIMD_ID", simd);
 		data |= umr_bitslice_compose_value(asic, ind_index, "INDEX", address);
 		data |= umr_bitslice_compose_value(asic, ind_index, "FORCE_READ", 1);
-		umr_write_reg(asic, ind_index->addr * 4, data);
-		return umr_read_reg(asic, ind_data->addr * 4);
+		umr_write_reg(asic, ind_index->addr * 4, data, REG_MMIO);
+		return umr_read_reg(asic, ind_data->addr * 4, REG_MMIO);
 	} else {
 		fprintf(stderr, "[BUG]: The required SQ_IND_{INDEX,DATA} registers are not found on the asic <%s>\n", asic->asicname);
 		return -1;
diff --git a/src/umr.h b/src/umr.h
index ccfac5da6438..cc17e256a834 100644
--- a/src/umr.h
+++ b/src/umr.h
@@ -471,8 +471,8 @@ uint32_t umr_find_reg(struct umr_asic *asic, char *regname);
 struct umr_reg *umr_find_reg_data(struct umr_asic *asic, char *regname);
 
 // read/write a 32-bit register given a BYTE address
-uint32_t umr_read_reg(struct umr_asic *asic, uint64_t addr);
-int umr_write_reg(struct umr_asic *asic, uint64_t addr, uint32_t value);
+uint32_t umr_read_reg(struct umr_asic *asic, uint64_t addr, enum regclass type);
+int umr_write_reg(struct umr_asic *asic, uint64_t addr, uint32_t value, enum regclass type);
 
 // read/write a register given a name
 uint32_t umr_read_reg_by_name(struct umr_asic *asic, char *name);
-- 
2.12.0



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