From ce0b60d530f60b736ec74e80445fb8420f399197 Mon Sep 17 00:00:00 2001
From: jsg <jsg@openbsd.org>
Date: Tue, 14 Dec 2021 12:48:15 +0000
Subject: [PATCH] use bus_space_read_region_1() when reading bios from pci rom

Avoids 'BIOS signature incorrect 0 0' warning seen on sparc64
(where pci is mapped little endian) reported by Ted Bullock.
---
 sys/dev/pci/drm/amd/amdgpu/amdgpu_bios.c | 15 +-------
 sys/dev/pci/drm/radeon/radeon_bios.c     | 48 +++++++++---------------
 2 files changed, 19 insertions(+), 44 deletions(-)

diff --git a/sys/dev/pci/drm/amd/amdgpu/amdgpu_bios.c b/sys/dev/pci/drm/amd/amdgpu/amdgpu_bios.c
index 91727d200e8..ab945875207 100644
--- a/sys/dev/pci/drm/amd/amdgpu/amdgpu_bios.c
+++ b/sys/dev/pci/drm/amd/amdgpu/amdgpu_bios.c
@@ -200,7 +200,6 @@ bool amdgpu_read_bios(struct amdgpu_device *adev)
 #else
 bool amdgpu_read_bios(struct amdgpu_device *adev)
 {
-	uint8_t __iomem *bios;
 	size_t size;
 	pcireg_t address, mask;
 	bus_space_handle_t romh;
@@ -218,25 +217,15 @@ bool amdgpu_read_bios(struct amdgpu_device *adev)
 	size = PCI_ROM_SIZE(mask);
 	if (size == 0)
 		return false;
-	rc = bus_space_map(adev->memt, PCI_ROM_ADDR(address), size,
-	    BUS_SPACE_MAP_LINEAR, &romh);
+	rc = bus_space_map(adev->memt, PCI_ROM_ADDR(address), size, 0, &romh);
 	if (rc != 0) {
 		printf(": can't map PCI ROM (%d)\n", rc);
 		return false;
 	}
-	bios = (uint8_t *)bus_space_vaddr(adev->memt, romh);
-	if (!bios) {
-		printf(": bus_space_vaddr failed\n");
-		return false;
-	}
 
 	adev->bios = kzalloc(size, GFP_KERNEL);
-	if (adev->bios == NULL) {
-		bus_space_unmap(adev->memt, romh, size);
-		return false;
-	}
 	adev->bios_size = size;
-	memcpy_fromio(adev->bios, bios, size);
+	bus_space_read_region_1(adev->memt, romh, 0, adev->bios, size);
 	bus_space_unmap(adev->memt, romh, size);
 
 	if (!check_atom_bios(adev->bios, size)) {
diff --git a/sys/dev/pci/drm/radeon/radeon_bios.c b/sys/dev/pci/drm/radeon/radeon_bios.c
index f0282c83240..121b286991e 100644
--- a/sys/dev/pci/drm/radeon/radeon_bios.c
+++ b/sys/dev/pci/drm/radeon/radeon_bios.c
@@ -89,7 +89,6 @@ static bool igp_read_bios_from_vram(struct radeon_device *rdev)
 #else
 static bool igp_read_bios_from_vram(struct radeon_device *rdev)
 {
-	uint8_t __iomem *bios;
 	bus_size_t size = 256 * 1024; /* ??? */
 	bus_space_handle_t bsh;
 	bus_space_tag_t bst = rdev->memt;
@@ -100,26 +99,19 @@ static bool igp_read_bios_from_vram(struct radeon_device *rdev)
 
 	rdev->bios = NULL;
 
-	if (bus_space_map(bst, rdev->fb_aper_offset, size, BUS_SPACE_MAP_LINEAR, &bsh) != 0)
-		return false;
-
-	bios = bus_space_vaddr(rdev->memt, bsh);
-	if (bios == NULL) {
-		bus_space_unmap(bst, bsh, size);
+	if (bus_space_map(bst, rdev->fb_aper_offset, size, 0, &bsh) != 0)
 		return false;
-	}
-	if (size == 0 || bios[0] != 0x55 || bios[1] != 0xaa) {
-		bus_space_unmap(bst, bsh, size);
-		return false;
-	}
 
 	rdev->bios = kmalloc(size, GFP_KERNEL);
-	if (rdev->bios == NULL) {
-		bus_space_unmap(bst, bsh, size);
+	bus_space_read_region_1(rdev->memt, bsh, 0, rdev->bios, size);
+	bus_space_unmap(bst, bsh, size);
+
+	if (size == 0 || rdev->bios[0] != 0x55 || rdev->bios[1] != 0xaa) {
+		kfree(rdev->bios);
+		rdev->bios = NULL;
 		return false;
 	}
-	memcpy_fromio(rdev->bios, bios, size);
-	bus_space_unmap(bst, bsh, size);
+
 	return true;
 }
 #endif
@@ -156,7 +148,6 @@ static bool radeon_read_bios(struct radeon_device *rdev)
 #else
 static bool radeon_read_bios(struct radeon_device *rdev)
 {
-	uint8_t __iomem *bios;
 	bus_size_t size;
 	pcireg_t address, mask;
 	bus_space_handle_t romh;
@@ -174,27 +165,22 @@ static bool radeon_read_bios(struct radeon_device *rdev)
 	size = PCI_ROM_SIZE(mask);
 	if (size == 0)
 		return false;
-	rc = bus_space_map(rdev->memt, PCI_ROM_ADDR(address), size,
-	    BUS_SPACE_MAP_LINEAR, &romh);
+	rc = bus_space_map(rdev->memt, PCI_ROM_ADDR(address), size, 0, &romh);
 	if (rc != 0) {
 		printf(": can't map PCI ROM (%d)\n", rc);
 		return false;
 	}
-	bios = (uint8_t *)bus_space_vaddr(rdev->memt, romh);
-	if (!bios) {
-		printf(": bus_space_vaddr failed\n");
-		return false;
-	}
-
-	if (size == 0 || bios[0] != 0x55 || bios[1] != 0xaa)
-		goto fail;
+	
 	rdev->bios = kmalloc(size, GFP_KERNEL);
-	memcpy(rdev->bios, bios, size);
+	bus_space_read_region_1(rdev->memt, romh, 0, rdev->bios, size);
 	bus_space_unmap(rdev->memt, romh, size);
+
+	if (size == 0 || rdev->bios[0] != 0x55 || rdev->bios[1] != 0xaa) {
+		kfree(rdev->bios);
+		rdev->bios = NULL;
+		return false;
+	}
 	return true;
-fail:
-	bus_space_unmap(rdev->memt, romh, size);
-	return false;
 }
 
 #endif
-- 
2.20.1